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2da776db MH |
1 | /* |
2 | * RDMA protocol and interfaces | |
3 | * | |
4 | * Copyright IBM, Corp. 2010-2013 | |
6ddd2d76 | 5 | * Copyright Red Hat, Inc. 2015-2016 |
2da776db MH |
6 | * |
7 | * Authors: | |
8 | * Michael R. Hines <mrhines@us.ibm.com> | |
9 | * Jiuxing Liu <jl@us.ibm.com> | |
6ddd2d76 | 10 | * Daniel P. Berrange <berrange@redhat.com> |
2da776db MH |
11 | * |
12 | * This work is licensed under the terms of the GNU GPL, version 2 or | |
13 | * later. See the COPYING file in the top-level directory. | |
14 | * | |
15 | */ | |
0b8fa32f | 16 | |
1393a485 | 17 | #include "qemu/osdep.h" |
da34e65c | 18 | #include "qapi/error.h" |
f348b6d1 | 19 | #include "qemu/cutils.h" |
e1a3ecee | 20 | #include "rdma.h" |
6666c96a | 21 | #include "migration.h" |
08a0aee1 | 22 | #include "qemu-file.h" |
7b1e1a22 | 23 | #include "ram.h" |
40014d81 | 24 | #include "qemu-file-channel.h" |
d49b6836 | 25 | #include "qemu/error-report.h" |
2da776db | 26 | #include "qemu/main-loop.h" |
0b8fa32f | 27 | #include "qemu/module.h" |
d4842052 | 28 | #include "qemu/rcu.h" |
2da776db MH |
29 | #include "qemu/sockets.h" |
30 | #include "qemu/bitmap.h" | |
10817bf0 | 31 | #include "qemu/coroutine.h" |
5f1f1902 | 32 | #include "exec/memory.h" |
2da776db MH |
33 | #include <sys/socket.h> |
34 | #include <netdb.h> | |
35 | #include <arpa/inet.h> | |
2da776db | 36 | #include <rdma/rdma_cma.h> |
733252de | 37 | #include "trace.h" |
db1015e9 | 38 | #include "qom/object.h" |
e49e49dd | 39 | #include <poll.h> |
2da776db MH |
40 | |
41 | /* | |
42 | * Print and error on both the Monitor and the Log file. | |
43 | */ | |
44 | #define ERROR(errp, fmt, ...) \ | |
45 | do { \ | |
66988941 | 46 | fprintf(stderr, "RDMA ERROR: " fmt "\n", ## __VA_ARGS__); \ |
2da776db MH |
47 | if (errp && (*(errp) == NULL)) { \ |
48 | error_setg(errp, "RDMA ERROR: " fmt, ## __VA_ARGS__); \ | |
49 | } \ | |
50 | } while (0) | |
51 | ||
52 | #define RDMA_RESOLVE_TIMEOUT_MS 10000 | |
53 | ||
54 | /* Do not merge data if larger than this. */ | |
55 | #define RDMA_MERGE_MAX (2 * 1024 * 1024) | |
56 | #define RDMA_SIGNALED_SEND_MAX (RDMA_MERGE_MAX / 4096) | |
57 | ||
58 | #define RDMA_REG_CHUNK_SHIFT 20 /* 1 MB */ | |
59 | ||
60 | /* | |
61 | * This is only for non-live state being migrated. | |
62 | * Instead of RDMA_WRITE messages, we use RDMA_SEND | |
63 | * messages for that state, which requires a different | |
64 | * delivery design than main memory. | |
65 | */ | |
66 | #define RDMA_SEND_INCREMENT 32768 | |
67 | ||
68 | /* | |
69 | * Maximum size infiniband SEND message | |
70 | */ | |
71 | #define RDMA_CONTROL_MAX_BUFFER (512 * 1024) | |
72 | #define RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE 4096 | |
73 | ||
74 | #define RDMA_CONTROL_VERSION_CURRENT 1 | |
75 | /* | |
76 | * Capabilities for negotiation. | |
77 | */ | |
78 | #define RDMA_CAPABILITY_PIN_ALL 0x01 | |
79 | ||
80 | /* | |
81 | * Add the other flags above to this list of known capabilities | |
82 | * as they are introduced. | |
83 | */ | |
84 | static uint32_t known_capabilities = RDMA_CAPABILITY_PIN_ALL; | |
85 | ||
86 | #define CHECK_ERROR_STATE() \ | |
87 | do { \ | |
88 | if (rdma->error_state) { \ | |
89 | if (!rdma->error_reported) { \ | |
733252de DDAG |
90 | error_report("RDMA is in an error state waiting migration" \ |
91 | " to abort!"); \ | |
2da776db MH |
92 | rdma->error_reported = 1; \ |
93 | } \ | |
94 | return rdma->error_state; \ | |
95 | } \ | |
2562755e | 96 | } while (0) |
2da776db MH |
97 | |
98 | /* | |
99 | * A work request ID is 64-bits and we split up these bits | |
100 | * into 3 parts: | |
101 | * | |
102 | * bits 0-15 : type of control message, 2^16 | |
103 | * bits 16-29: ram block index, 2^14 | |
104 | * bits 30-63: ram block chunk number, 2^34 | |
105 | * | |
106 | * The last two bit ranges are only used for RDMA writes, | |
107 | * in order to track their completion and potentially | |
108 | * also track unregistration status of the message. | |
109 | */ | |
110 | #define RDMA_WRID_TYPE_SHIFT 0UL | |
111 | #define RDMA_WRID_BLOCK_SHIFT 16UL | |
112 | #define RDMA_WRID_CHUNK_SHIFT 30UL | |
113 | ||
114 | #define RDMA_WRID_TYPE_MASK \ | |
115 | ((1UL << RDMA_WRID_BLOCK_SHIFT) - 1UL) | |
116 | ||
117 | #define RDMA_WRID_BLOCK_MASK \ | |
118 | (~RDMA_WRID_TYPE_MASK & ((1UL << RDMA_WRID_CHUNK_SHIFT) - 1UL)) | |
119 | ||
120 | #define RDMA_WRID_CHUNK_MASK (~RDMA_WRID_BLOCK_MASK & ~RDMA_WRID_TYPE_MASK) | |
121 | ||
122 | /* | |
123 | * RDMA migration protocol: | |
124 | * 1. RDMA Writes (data messages, i.e. RAM) | |
125 | * 2. IB Send/Recv (control channel messages) | |
126 | */ | |
127 | enum { | |
128 | RDMA_WRID_NONE = 0, | |
129 | RDMA_WRID_RDMA_WRITE = 1, | |
130 | RDMA_WRID_SEND_CONTROL = 2000, | |
131 | RDMA_WRID_RECV_CONTROL = 4000, | |
132 | }; | |
133 | ||
2ae31aea | 134 | static const char *wrid_desc[] = { |
2da776db MH |
135 | [RDMA_WRID_NONE] = "NONE", |
136 | [RDMA_WRID_RDMA_WRITE] = "WRITE RDMA", | |
137 | [RDMA_WRID_SEND_CONTROL] = "CONTROL SEND", | |
138 | [RDMA_WRID_RECV_CONTROL] = "CONTROL RECV", | |
139 | }; | |
140 | ||
141 | /* | |
142 | * Work request IDs for IB SEND messages only (not RDMA writes). | |
143 | * This is used by the migration protocol to transmit | |
144 | * control messages (such as device state and registration commands) | |
145 | * | |
146 | * We could use more WRs, but we have enough for now. | |
147 | */ | |
148 | enum { | |
149 | RDMA_WRID_READY = 0, | |
150 | RDMA_WRID_DATA, | |
151 | RDMA_WRID_CONTROL, | |
152 | RDMA_WRID_MAX, | |
153 | }; | |
154 | ||
155 | /* | |
156 | * SEND/RECV IB Control Messages. | |
157 | */ | |
158 | enum { | |
159 | RDMA_CONTROL_NONE = 0, | |
160 | RDMA_CONTROL_ERROR, | |
161 | RDMA_CONTROL_READY, /* ready to receive */ | |
162 | RDMA_CONTROL_QEMU_FILE, /* QEMUFile-transmitted bytes */ | |
163 | RDMA_CONTROL_RAM_BLOCKS_REQUEST, /* RAMBlock synchronization */ | |
164 | RDMA_CONTROL_RAM_BLOCKS_RESULT, /* RAMBlock synchronization */ | |
165 | RDMA_CONTROL_COMPRESS, /* page contains repeat values */ | |
166 | RDMA_CONTROL_REGISTER_REQUEST, /* dynamic page registration */ | |
167 | RDMA_CONTROL_REGISTER_RESULT, /* key to use after registration */ | |
168 | RDMA_CONTROL_REGISTER_FINISHED, /* current iteration finished */ | |
169 | RDMA_CONTROL_UNREGISTER_REQUEST, /* dynamic UN-registration */ | |
170 | RDMA_CONTROL_UNREGISTER_FINISHED, /* unpinning finished */ | |
171 | }; | |
172 | ||
2da776db MH |
173 | |
174 | /* | |
175 | * Memory and MR structures used to represent an IB Send/Recv work request. | |
176 | * This is *not* used for RDMA writes, only IB Send/Recv. | |
177 | */ | |
178 | typedef struct { | |
179 | uint8_t control[RDMA_CONTROL_MAX_BUFFER]; /* actual buffer to register */ | |
180 | struct ibv_mr *control_mr; /* registration metadata */ | |
181 | size_t control_len; /* length of the message */ | |
182 | uint8_t *control_curr; /* start of unconsumed bytes */ | |
183 | } RDMAWorkRequestData; | |
184 | ||
185 | /* | |
186 | * Negotiate RDMA capabilities during connection-setup time. | |
187 | */ | |
188 | typedef struct { | |
189 | uint32_t version; | |
190 | uint32_t flags; | |
191 | } RDMACapabilities; | |
192 | ||
193 | static void caps_to_network(RDMACapabilities *cap) | |
194 | { | |
195 | cap->version = htonl(cap->version); | |
196 | cap->flags = htonl(cap->flags); | |
197 | } | |
198 | ||
199 | static void network_to_caps(RDMACapabilities *cap) | |
200 | { | |
201 | cap->version = ntohl(cap->version); | |
202 | cap->flags = ntohl(cap->flags); | |
203 | } | |
204 | ||
205 | /* | |
206 | * Representation of a RAMBlock from an RDMA perspective. | |
207 | * This is not transmitted, only local. | |
208 | * This and subsequent structures cannot be linked lists | |
209 | * because we're using a single IB message to transmit | |
210 | * the information. It's small anyway, so a list is overkill. | |
211 | */ | |
212 | typedef struct RDMALocalBlock { | |
4fb5364b DDAG |
213 | char *block_name; |
214 | uint8_t *local_host_addr; /* local virtual address */ | |
215 | uint64_t remote_host_addr; /* remote virtual address */ | |
216 | uint64_t offset; | |
217 | uint64_t length; | |
218 | struct ibv_mr **pmr; /* MRs for chunk-level registration */ | |
219 | struct ibv_mr *mr; /* MR for non-chunk-level registration */ | |
220 | uint32_t *remote_keys; /* rkeys for chunk-level registration */ | |
221 | uint32_t remote_rkey; /* rkeys for non-chunk-level registration */ | |
222 | int index; /* which block are we */ | |
e4d63320 | 223 | unsigned int src_index; /* (Only used on dest) */ |
4fb5364b DDAG |
224 | bool is_ram_block; |
225 | int nb_chunks; | |
2da776db MH |
226 | unsigned long *transit_bitmap; |
227 | unsigned long *unregister_bitmap; | |
228 | } RDMALocalBlock; | |
229 | ||
230 | /* | |
231 | * Also represents a RAMblock, but only on the dest. | |
232 | * This gets transmitted by the dest during connection-time | |
233 | * to the source VM and then is used to populate the | |
234 | * corresponding RDMALocalBlock with | |
235 | * the information needed to perform the actual RDMA. | |
236 | */ | |
a97270ad | 237 | typedef struct QEMU_PACKED RDMADestBlock { |
2da776db MH |
238 | uint64_t remote_host_addr; |
239 | uint64_t offset; | |
240 | uint64_t length; | |
241 | uint32_t remote_rkey; | |
242 | uint32_t padding; | |
a97270ad | 243 | } RDMADestBlock; |
2da776db | 244 | |
482a33c5 DDAG |
245 | static const char *control_desc(unsigned int rdma_control) |
246 | { | |
247 | static const char *strs[] = { | |
248 | [RDMA_CONTROL_NONE] = "NONE", | |
249 | [RDMA_CONTROL_ERROR] = "ERROR", | |
250 | [RDMA_CONTROL_READY] = "READY", | |
251 | [RDMA_CONTROL_QEMU_FILE] = "QEMU FILE", | |
252 | [RDMA_CONTROL_RAM_BLOCKS_REQUEST] = "RAM BLOCKS REQUEST", | |
253 | [RDMA_CONTROL_RAM_BLOCKS_RESULT] = "RAM BLOCKS RESULT", | |
254 | [RDMA_CONTROL_COMPRESS] = "COMPRESS", | |
255 | [RDMA_CONTROL_REGISTER_REQUEST] = "REGISTER REQUEST", | |
256 | [RDMA_CONTROL_REGISTER_RESULT] = "REGISTER RESULT", | |
257 | [RDMA_CONTROL_REGISTER_FINISHED] = "REGISTER FINISHED", | |
258 | [RDMA_CONTROL_UNREGISTER_REQUEST] = "UNREGISTER REQUEST", | |
259 | [RDMA_CONTROL_UNREGISTER_FINISHED] = "UNREGISTER FINISHED", | |
260 | }; | |
261 | ||
262 | if (rdma_control > RDMA_CONTROL_UNREGISTER_FINISHED) { | |
263 | return "??BAD CONTROL VALUE??"; | |
264 | } | |
265 | ||
266 | return strs[rdma_control]; | |
267 | } | |
268 | ||
2da776db MH |
269 | static uint64_t htonll(uint64_t v) |
270 | { | |
271 | union { uint32_t lv[2]; uint64_t llv; } u; | |
272 | u.lv[0] = htonl(v >> 32); | |
273 | u.lv[1] = htonl(v & 0xFFFFFFFFULL); | |
274 | return u.llv; | |
275 | } | |
276 | ||
cbfc71b5 BY |
277 | static uint64_t ntohll(uint64_t v) |
278 | { | |
2da776db MH |
279 | union { uint32_t lv[2]; uint64_t llv; } u; |
280 | u.llv = v; | |
281 | return ((uint64_t)ntohl(u.lv[0]) << 32) | (uint64_t) ntohl(u.lv[1]); | |
282 | } | |
283 | ||
a97270ad | 284 | static void dest_block_to_network(RDMADestBlock *db) |
2da776db | 285 | { |
a97270ad DDAG |
286 | db->remote_host_addr = htonll(db->remote_host_addr); |
287 | db->offset = htonll(db->offset); | |
288 | db->length = htonll(db->length); | |
289 | db->remote_rkey = htonl(db->remote_rkey); | |
2da776db MH |
290 | } |
291 | ||
a97270ad | 292 | static void network_to_dest_block(RDMADestBlock *db) |
2da776db | 293 | { |
a97270ad DDAG |
294 | db->remote_host_addr = ntohll(db->remote_host_addr); |
295 | db->offset = ntohll(db->offset); | |
296 | db->length = ntohll(db->length); | |
297 | db->remote_rkey = ntohl(db->remote_rkey); | |
2da776db MH |
298 | } |
299 | ||
300 | /* | |
301 | * Virtual address of the above structures used for transmitting | |
302 | * the RAMBlock descriptions at connection-time. | |
303 | * This structure is *not* transmitted. | |
304 | */ | |
305 | typedef struct RDMALocalBlocks { | |
306 | int nb_blocks; | |
307 | bool init; /* main memory init complete */ | |
308 | RDMALocalBlock *block; | |
309 | } RDMALocalBlocks; | |
310 | ||
311 | /* | |
312 | * Main data structure for RDMA state. | |
313 | * While there is only one copy of this structure being allocated right now, | |
314 | * this is the place where one would start if you wanted to consider | |
315 | * having more than one RDMA connection open at the same time. | |
316 | */ | |
317 | typedef struct RDMAContext { | |
318 | char *host; | |
319 | int port; | |
44bcfd45 | 320 | char *host_port; |
2da776db | 321 | |
1f22364b | 322 | RDMAWorkRequestData wr_data[RDMA_WRID_MAX]; |
2da776db MH |
323 | |
324 | /* | |
325 | * This is used by *_exchange_send() to figure out whether or not | |
326 | * the initial "READY" message has already been received or not. | |
327 | * This is because other functions may potentially poll() and detect | |
328 | * the READY message before send() does, in which case we need to | |
329 | * know if it completed. | |
330 | */ | |
331 | int control_ready_expected; | |
332 | ||
333 | /* number of outstanding writes */ | |
334 | int nb_sent; | |
335 | ||
336 | /* store info about current buffer so that we can | |
337 | merge it with future sends */ | |
338 | uint64_t current_addr; | |
339 | uint64_t current_length; | |
340 | /* index of ram block the current buffer belongs to */ | |
341 | int current_index; | |
342 | /* index of the chunk in the current ram block */ | |
343 | int current_chunk; | |
344 | ||
345 | bool pin_all; | |
346 | ||
347 | /* | |
348 | * infiniband-specific variables for opening the device | |
349 | * and maintaining connection state and so forth. | |
350 | * | |
351 | * cm_id also has ibv_context, rdma_event_channel, and ibv_qp in | |
352 | * cm_id->verbs, cm_id->channel, and cm_id->qp. | |
353 | */ | |
354 | struct rdma_cm_id *cm_id; /* connection manager ID */ | |
355 | struct rdma_cm_id *listen_id; | |
5a91337c | 356 | bool connected; |
2da776db MH |
357 | |
358 | struct ibv_context *verbs; | |
359 | struct rdma_event_channel *channel; | |
360 | struct ibv_qp *qp; /* queue pair */ | |
b390afd8 LZ |
361 | struct ibv_comp_channel *recv_comp_channel; /* recv completion channel */ |
362 | struct ibv_comp_channel *send_comp_channel; /* send completion channel */ | |
2da776db | 363 | struct ibv_pd *pd; /* protection domain */ |
b390afd8 LZ |
364 | struct ibv_cq *recv_cq; /* recvieve completion queue */ |
365 | struct ibv_cq *send_cq; /* send completion queue */ | |
2da776db MH |
366 | |
367 | /* | |
368 | * If a previous write failed (perhaps because of a failed | |
369 | * memory registration, then do not attempt any future work | |
370 | * and remember the error state. | |
371 | */ | |
372 | int error_state; | |
373 | int error_reported; | |
cd5ea070 | 374 | int received_error; |
2da776db MH |
375 | |
376 | /* | |
377 | * Description of ram blocks used throughout the code. | |
378 | */ | |
379 | RDMALocalBlocks local_ram_blocks; | |
a97270ad | 380 | RDMADestBlock *dest_blocks; |
2da776db | 381 | |
e4d63320 DDAG |
382 | /* Index of the next RAMBlock received during block registration */ |
383 | unsigned int next_src_index; | |
384 | ||
2da776db MH |
385 | /* |
386 | * Migration on *destination* started. | |
387 | * Then use coroutine yield function. | |
388 | * Source runs in a thread, so we don't care. | |
389 | */ | |
390 | int migration_started_on_destination; | |
391 | ||
392 | int total_registrations; | |
393 | int total_writes; | |
394 | ||
395 | int unregister_current, unregister_next; | |
396 | uint64_t unregistrations[RDMA_SIGNALED_SEND_MAX]; | |
397 | ||
398 | GHashTable *blockmap; | |
55cc1b59 LC |
399 | |
400 | /* the RDMAContext for return path */ | |
401 | struct RDMAContext *return_path; | |
402 | bool is_return_path; | |
2da776db MH |
403 | } RDMAContext; |
404 | ||
6ddd2d76 | 405 | #define TYPE_QIO_CHANNEL_RDMA "qio-channel-rdma" |
8063396b | 406 | OBJECT_DECLARE_SIMPLE_TYPE(QIOChannelRDMA, QIO_CHANNEL_RDMA) |
6ddd2d76 | 407 | |
6ddd2d76 DB |
408 | |
409 | ||
410 | struct QIOChannelRDMA { | |
411 | QIOChannel parent; | |
74637e6f LC |
412 | RDMAContext *rdmain; |
413 | RDMAContext *rdmaout; | |
6ddd2d76 | 414 | QEMUFile *file; |
6ddd2d76 DB |
415 | bool blocking; /* XXX we don't actually honour this yet */ |
416 | }; | |
2da776db MH |
417 | |
418 | /* | |
419 | * Main structure for IB Send/Recv control messages. | |
420 | * This gets prepended at the beginning of every Send/Recv. | |
421 | */ | |
422 | typedef struct QEMU_PACKED { | |
423 | uint32_t len; /* Total length of data portion */ | |
424 | uint32_t type; /* which control command to perform */ | |
425 | uint32_t repeat; /* number of commands in data portion of same type */ | |
426 | uint32_t padding; | |
427 | } RDMAControlHeader; | |
428 | ||
429 | static void control_to_network(RDMAControlHeader *control) | |
430 | { | |
431 | control->type = htonl(control->type); | |
432 | control->len = htonl(control->len); | |
433 | control->repeat = htonl(control->repeat); | |
434 | } | |
435 | ||
436 | static void network_to_control(RDMAControlHeader *control) | |
437 | { | |
438 | control->type = ntohl(control->type); | |
439 | control->len = ntohl(control->len); | |
440 | control->repeat = ntohl(control->repeat); | |
441 | } | |
442 | ||
443 | /* | |
444 | * Register a single Chunk. | |
445 | * Information sent by the source VM to inform the dest | |
446 | * to register an single chunk of memory before we can perform | |
447 | * the actual RDMA operation. | |
448 | */ | |
449 | typedef struct QEMU_PACKED { | |
450 | union QEMU_PACKED { | |
b12f7777 | 451 | uint64_t current_addr; /* offset into the ram_addr_t space */ |
2da776db MH |
452 | uint64_t chunk; /* chunk to lookup if unregistering */ |
453 | } key; | |
454 | uint32_t current_index; /* which ramblock the chunk belongs to */ | |
455 | uint32_t padding; | |
456 | uint64_t chunks; /* how many sequential chunks to register */ | |
457 | } RDMARegister; | |
458 | ||
b12f7777 | 459 | static void register_to_network(RDMAContext *rdma, RDMARegister *reg) |
2da776db | 460 | { |
b12f7777 DDAG |
461 | RDMALocalBlock *local_block; |
462 | local_block = &rdma->local_ram_blocks.block[reg->current_index]; | |
463 | ||
464 | if (local_block->is_ram_block) { | |
465 | /* | |
466 | * current_addr as passed in is an address in the local ram_addr_t | |
467 | * space, we need to translate this for the destination | |
468 | */ | |
469 | reg->key.current_addr -= local_block->offset; | |
470 | reg->key.current_addr += rdma->dest_blocks[reg->current_index].offset; | |
471 | } | |
2da776db MH |
472 | reg->key.current_addr = htonll(reg->key.current_addr); |
473 | reg->current_index = htonl(reg->current_index); | |
474 | reg->chunks = htonll(reg->chunks); | |
475 | } | |
476 | ||
477 | static void network_to_register(RDMARegister *reg) | |
478 | { | |
479 | reg->key.current_addr = ntohll(reg->key.current_addr); | |
480 | reg->current_index = ntohl(reg->current_index); | |
481 | reg->chunks = ntohll(reg->chunks); | |
482 | } | |
483 | ||
484 | typedef struct QEMU_PACKED { | |
485 | uint32_t value; /* if zero, we will madvise() */ | |
486 | uint32_t block_idx; /* which ram block index */ | |
b12f7777 | 487 | uint64_t offset; /* Address in remote ram_addr_t space */ |
2da776db MH |
488 | uint64_t length; /* length of the chunk */ |
489 | } RDMACompress; | |
490 | ||
b12f7777 | 491 | static void compress_to_network(RDMAContext *rdma, RDMACompress *comp) |
2da776db MH |
492 | { |
493 | comp->value = htonl(comp->value); | |
b12f7777 DDAG |
494 | /* |
495 | * comp->offset as passed in is an address in the local ram_addr_t | |
496 | * space, we need to translate this for the destination | |
497 | */ | |
498 | comp->offset -= rdma->local_ram_blocks.block[comp->block_idx].offset; | |
499 | comp->offset += rdma->dest_blocks[comp->block_idx].offset; | |
2da776db MH |
500 | comp->block_idx = htonl(comp->block_idx); |
501 | comp->offset = htonll(comp->offset); | |
502 | comp->length = htonll(comp->length); | |
503 | } | |
504 | ||
505 | static void network_to_compress(RDMACompress *comp) | |
506 | { | |
507 | comp->value = ntohl(comp->value); | |
508 | comp->block_idx = ntohl(comp->block_idx); | |
509 | comp->offset = ntohll(comp->offset); | |
510 | comp->length = ntohll(comp->length); | |
511 | } | |
512 | ||
513 | /* | |
514 | * The result of the dest's memory registration produces an "rkey" | |
515 | * which the source VM must reference in order to perform | |
516 | * the RDMA operation. | |
517 | */ | |
518 | typedef struct QEMU_PACKED { | |
519 | uint32_t rkey; | |
520 | uint32_t padding; | |
521 | uint64_t host_addr; | |
522 | } RDMARegisterResult; | |
523 | ||
524 | static void result_to_network(RDMARegisterResult *result) | |
525 | { | |
526 | result->rkey = htonl(result->rkey); | |
527 | result->host_addr = htonll(result->host_addr); | |
528 | }; | |
529 | ||
530 | static void network_to_result(RDMARegisterResult *result) | |
531 | { | |
532 | result->rkey = ntohl(result->rkey); | |
533 | result->host_addr = ntohll(result->host_addr); | |
534 | }; | |
535 | ||
536 | const char *print_wrid(int wrid); | |
537 | static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, | |
538 | uint8_t *data, RDMAControlHeader *resp, | |
539 | int *resp_idx, | |
540 | int (*callback)(RDMAContext *rdma)); | |
541 | ||
dd286ed7 IY |
542 | static inline uint64_t ram_chunk_index(const uint8_t *start, |
543 | const uint8_t *host) | |
2da776db MH |
544 | { |
545 | return ((uintptr_t) host - (uintptr_t) start) >> RDMA_REG_CHUNK_SHIFT; | |
546 | } | |
547 | ||
dd286ed7 | 548 | static inline uint8_t *ram_chunk_start(const RDMALocalBlock *rdma_ram_block, |
2da776db MH |
549 | uint64_t i) |
550 | { | |
fbce8c25 SW |
551 | return (uint8_t *)(uintptr_t)(rdma_ram_block->local_host_addr + |
552 | (i << RDMA_REG_CHUNK_SHIFT)); | |
2da776db MH |
553 | } |
554 | ||
dd286ed7 IY |
555 | static inline uint8_t *ram_chunk_end(const RDMALocalBlock *rdma_ram_block, |
556 | uint64_t i) | |
2da776db MH |
557 | { |
558 | uint8_t *result = ram_chunk_start(rdma_ram_block, i) + | |
559 | (1UL << RDMA_REG_CHUNK_SHIFT); | |
560 | ||
561 | if (result > (rdma_ram_block->local_host_addr + rdma_ram_block->length)) { | |
562 | result = rdma_ram_block->local_host_addr + rdma_ram_block->length; | |
563 | } | |
564 | ||
565 | return result; | |
566 | } | |
567 | ||
4fb5364b DDAG |
568 | static int rdma_add_block(RDMAContext *rdma, const char *block_name, |
569 | void *host_addr, | |
2da776db MH |
570 | ram_addr_t block_offset, uint64_t length) |
571 | { | |
572 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
760ff4be | 573 | RDMALocalBlock *block; |
2da776db MH |
574 | RDMALocalBlock *old = local->block; |
575 | ||
97f3ad35 | 576 | local->block = g_new0(RDMALocalBlock, local->nb_blocks + 1); |
2da776db MH |
577 | |
578 | if (local->nb_blocks) { | |
579 | int x; | |
580 | ||
760ff4be DDAG |
581 | if (rdma->blockmap) { |
582 | for (x = 0; x < local->nb_blocks; x++) { | |
583 | g_hash_table_remove(rdma->blockmap, | |
584 | (void *)(uintptr_t)old[x].offset); | |
585 | g_hash_table_insert(rdma->blockmap, | |
586 | (void *)(uintptr_t)old[x].offset, | |
587 | &local->block[x]); | |
588 | } | |
2da776db MH |
589 | } |
590 | memcpy(local->block, old, sizeof(RDMALocalBlock) * local->nb_blocks); | |
591 | g_free(old); | |
592 | } | |
593 | ||
594 | block = &local->block[local->nb_blocks]; | |
595 | ||
4fb5364b | 596 | block->block_name = g_strdup(block_name); |
2da776db MH |
597 | block->local_host_addr = host_addr; |
598 | block->offset = block_offset; | |
599 | block->length = length; | |
600 | block->index = local->nb_blocks; | |
e4d63320 | 601 | block->src_index = ~0U; /* Filled in by the receipt of the block list */ |
2da776db MH |
602 | block->nb_chunks = ram_chunk_index(host_addr, host_addr + length) + 1UL; |
603 | block->transit_bitmap = bitmap_new(block->nb_chunks); | |
604 | bitmap_clear(block->transit_bitmap, 0, block->nb_chunks); | |
605 | block->unregister_bitmap = bitmap_new(block->nb_chunks); | |
606 | bitmap_clear(block->unregister_bitmap, 0, block->nb_chunks); | |
97f3ad35 | 607 | block->remote_keys = g_new0(uint32_t, block->nb_chunks); |
2da776db MH |
608 | |
609 | block->is_ram_block = local->init ? false : true; | |
610 | ||
760ff4be | 611 | if (rdma->blockmap) { |
80e60c6e | 612 | g_hash_table_insert(rdma->blockmap, (void *)(uintptr_t)block_offset, block); |
760ff4be | 613 | } |
2da776db | 614 | |
4fb5364b DDAG |
615 | trace_rdma_add_block(block_name, local->nb_blocks, |
616 | (uintptr_t) block->local_host_addr, | |
ba795761 | 617 | block->offset, block->length, |
fbce8c25 | 618 | (uintptr_t) (block->local_host_addr + block->length), |
ba795761 DDAG |
619 | BITS_TO_LONGS(block->nb_chunks) * |
620 | sizeof(unsigned long) * 8, | |
621 | block->nb_chunks); | |
2da776db MH |
622 | |
623 | local->nb_blocks++; | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Memory regions need to be registered with the device and queue pairs setup | |
630 | * in advanced before the migration starts. This tells us where the RAM blocks | |
631 | * are so that we can register them individually. | |
632 | */ | |
754cb9c0 | 633 | static int qemu_rdma_init_one_block(RAMBlock *rb, void *opaque) |
2da776db | 634 | { |
754cb9c0 YK |
635 | const char *block_name = qemu_ram_get_idstr(rb); |
636 | void *host_addr = qemu_ram_get_host_addr(rb); | |
637 | ram_addr_t block_offset = qemu_ram_get_offset(rb); | |
638 | ram_addr_t length = qemu_ram_get_used_length(rb); | |
4fb5364b | 639 | return rdma_add_block(opaque, block_name, host_addr, block_offset, length); |
2da776db MH |
640 | } |
641 | ||
642 | /* | |
643 | * Identify the RAMBlocks and their quantity. They will be references to | |
644 | * identify chunk boundaries inside each RAMBlock and also be referenced | |
645 | * during dynamic page registration. | |
646 | */ | |
647 | static int qemu_rdma_init_ram_blocks(RDMAContext *rdma) | |
648 | { | |
649 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
281496bb | 650 | int ret; |
2da776db MH |
651 | |
652 | assert(rdma->blockmap == NULL); | |
2da776db | 653 | memset(local, 0, sizeof *local); |
281496bb DDAG |
654 | ret = foreach_not_ignored_block(qemu_rdma_init_one_block, rdma); |
655 | if (ret) { | |
656 | return ret; | |
657 | } | |
733252de | 658 | trace_qemu_rdma_init_ram_blocks(local->nb_blocks); |
97f3ad35 MA |
659 | rdma->dest_blocks = g_new0(RDMADestBlock, |
660 | rdma->local_ram_blocks.nb_blocks); | |
2da776db MH |
661 | local->init = true; |
662 | return 0; | |
663 | } | |
664 | ||
03fcab38 DDAG |
665 | /* |
666 | * Note: If used outside of cleanup, the caller must ensure that the destination | |
667 | * block structures are also updated | |
668 | */ | |
669 | static int rdma_delete_block(RDMAContext *rdma, RDMALocalBlock *block) | |
2da776db MH |
670 | { |
671 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
2da776db MH |
672 | RDMALocalBlock *old = local->block; |
673 | int x; | |
674 | ||
03fcab38 DDAG |
675 | if (rdma->blockmap) { |
676 | g_hash_table_remove(rdma->blockmap, (void *)(uintptr_t)block->offset); | |
677 | } | |
2da776db MH |
678 | if (block->pmr) { |
679 | int j; | |
680 | ||
681 | for (j = 0; j < block->nb_chunks; j++) { | |
682 | if (!block->pmr[j]) { | |
683 | continue; | |
684 | } | |
685 | ibv_dereg_mr(block->pmr[j]); | |
686 | rdma->total_registrations--; | |
687 | } | |
688 | g_free(block->pmr); | |
689 | block->pmr = NULL; | |
690 | } | |
691 | ||
692 | if (block->mr) { | |
693 | ibv_dereg_mr(block->mr); | |
694 | rdma->total_registrations--; | |
695 | block->mr = NULL; | |
696 | } | |
697 | ||
698 | g_free(block->transit_bitmap); | |
699 | block->transit_bitmap = NULL; | |
700 | ||
701 | g_free(block->unregister_bitmap); | |
702 | block->unregister_bitmap = NULL; | |
703 | ||
704 | g_free(block->remote_keys); | |
705 | block->remote_keys = NULL; | |
706 | ||
4fb5364b DDAG |
707 | g_free(block->block_name); |
708 | block->block_name = NULL; | |
709 | ||
03fcab38 DDAG |
710 | if (rdma->blockmap) { |
711 | for (x = 0; x < local->nb_blocks; x++) { | |
712 | g_hash_table_remove(rdma->blockmap, | |
713 | (void *)(uintptr_t)old[x].offset); | |
714 | } | |
2da776db MH |
715 | } |
716 | ||
717 | if (local->nb_blocks > 1) { | |
718 | ||
97f3ad35 | 719 | local->block = g_new0(RDMALocalBlock, local->nb_blocks - 1); |
2da776db MH |
720 | |
721 | if (block->index) { | |
722 | memcpy(local->block, old, sizeof(RDMALocalBlock) * block->index); | |
723 | } | |
724 | ||
725 | if (block->index < (local->nb_blocks - 1)) { | |
726 | memcpy(local->block + block->index, old + (block->index + 1), | |
727 | sizeof(RDMALocalBlock) * | |
728 | (local->nb_blocks - (block->index + 1))); | |
71cd7306 LC |
729 | for (x = block->index; x < local->nb_blocks - 1; x++) { |
730 | local->block[x].index--; | |
731 | } | |
2da776db MH |
732 | } |
733 | } else { | |
734 | assert(block == local->block); | |
735 | local->block = NULL; | |
736 | } | |
737 | ||
03fcab38 | 738 | trace_rdma_delete_block(block, (uintptr_t)block->local_host_addr, |
733252de | 739 | block->offset, block->length, |
fbce8c25 | 740 | (uintptr_t)(block->local_host_addr + block->length), |
733252de DDAG |
741 | BITS_TO_LONGS(block->nb_chunks) * |
742 | sizeof(unsigned long) * 8, block->nb_chunks); | |
2da776db MH |
743 | |
744 | g_free(old); | |
745 | ||
746 | local->nb_blocks--; | |
747 | ||
03fcab38 | 748 | if (local->nb_blocks && rdma->blockmap) { |
2da776db | 749 | for (x = 0; x < local->nb_blocks; x++) { |
fbce8c25 SW |
750 | g_hash_table_insert(rdma->blockmap, |
751 | (void *)(uintptr_t)local->block[x].offset, | |
752 | &local->block[x]); | |
2da776db MH |
753 | } |
754 | } | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Put in the log file which RDMA device was opened and the details | |
761 | * associated with that device. | |
762 | */ | |
763 | static void qemu_rdma_dump_id(const char *who, struct ibv_context *verbs) | |
764 | { | |
7fc5b13f MH |
765 | struct ibv_port_attr port; |
766 | ||
767 | if (ibv_query_port(verbs, 1, &port)) { | |
733252de | 768 | error_report("Failed to query port information"); |
7fc5b13f MH |
769 | return; |
770 | } | |
771 | ||
2da776db MH |
772 | printf("%s RDMA Device opened: kernel name %s " |
773 | "uverbs device name %s, " | |
7fc5b13f MH |
774 | "infiniband_verbs class device path %s, " |
775 | "infiniband class device path %s, " | |
776 | "transport: (%d) %s\n", | |
2da776db MH |
777 | who, |
778 | verbs->device->name, | |
779 | verbs->device->dev_name, | |
780 | verbs->device->dev_path, | |
7fc5b13f MH |
781 | verbs->device->ibdev_path, |
782 | port.link_layer, | |
783 | (port.link_layer == IBV_LINK_LAYER_INFINIBAND) ? "Infiniband" : | |
02942db7 | 784 | ((port.link_layer == IBV_LINK_LAYER_ETHERNET) |
7fc5b13f | 785 | ? "Ethernet" : "Unknown")); |
2da776db MH |
786 | } |
787 | ||
788 | /* | |
789 | * Put in the log file the RDMA gid addressing information, | |
790 | * useful for folks who have trouble understanding the | |
791 | * RDMA device hierarchy in the kernel. | |
792 | */ | |
793 | static void qemu_rdma_dump_gid(const char *who, struct rdma_cm_id *id) | |
794 | { | |
795 | char sgid[33]; | |
796 | char dgid[33]; | |
797 | inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.sgid, sgid, sizeof sgid); | |
798 | inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.dgid, dgid, sizeof dgid); | |
733252de | 799 | trace_qemu_rdma_dump_gid(who, sgid, dgid); |
2da776db MH |
800 | } |
801 | ||
7fc5b13f MH |
802 | /* |
803 | * As of now, IPv6 over RoCE / iWARP is not supported by linux. | |
804 | * We will try the next addrinfo struct, and fail if there are | |
805 | * no other valid addresses to bind against. | |
806 | * | |
807 | * If user is listening on '[::]', then we will not have a opened a device | |
808 | * yet and have no way of verifying if the device is RoCE or not. | |
809 | * | |
810 | * In this case, the source VM will throw an error for ALL types of | |
811 | * connections (both IPv4 and IPv6) if the destination machine does not have | |
812 | * a regular infiniband network available for use. | |
813 | * | |
4c293dc6 | 814 | * The only way to guarantee that an error is thrown for broken kernels is |
7fc5b13f MH |
815 | * for the management software to choose a *specific* interface at bind time |
816 | * and validate what time of hardware it is. | |
817 | * | |
818 | * Unfortunately, this puts the user in a fix: | |
02942db7 | 819 | * |
7fc5b13f MH |
820 | * If the source VM connects with an IPv4 address without knowing that the |
821 | * destination has bound to '[::]' the migration will unconditionally fail | |
b6af0975 | 822 | * unless the management software is explicitly listening on the IPv4 |
7fc5b13f MH |
823 | * address while using a RoCE-based device. |
824 | * | |
825 | * If the source VM connects with an IPv6 address, then we're OK because we can | |
826 | * throw an error on the source (and similarly on the destination). | |
02942db7 | 827 | * |
7fc5b13f MH |
828 | * But in mixed environments, this will be broken for a while until it is fixed |
829 | * inside linux. | |
830 | * | |
831 | * We do provide a *tiny* bit of help in this function: We can list all of the | |
832 | * devices in the system and check to see if all the devices are RoCE or | |
02942db7 | 833 | * Infiniband. |
7fc5b13f MH |
834 | * |
835 | * If we detect that we have a *pure* RoCE environment, then we can safely | |
4c293dc6 | 836 | * thrown an error even if the management software has specified '[::]' as the |
7fc5b13f MH |
837 | * bind address. |
838 | * | |
839 | * However, if there is are multiple hetergeneous devices, then we cannot make | |
840 | * this assumption and the user just has to be sure they know what they are | |
841 | * doing. | |
842 | * | |
843 | * Patches are being reviewed on linux-rdma. | |
844 | */ | |
bbfb89e3 | 845 | static int qemu_rdma_broken_ipv6_kernel(struct ibv_context *verbs, Error **errp) |
7fc5b13f | 846 | { |
7fc5b13f MH |
847 | /* This bug only exists in linux, to our knowledge. */ |
848 | #ifdef CONFIG_LINUX | |
1f4abd81 | 849 | struct ibv_port_attr port_attr; |
7fc5b13f | 850 | |
02942db7 | 851 | /* |
7fc5b13f | 852 | * Verbs are only NULL if management has bound to '[::]'. |
02942db7 | 853 | * |
7fc5b13f MH |
854 | * Let's iterate through all the devices and see if there any pure IB |
855 | * devices (non-ethernet). | |
02942db7 | 856 | * |
7fc5b13f | 857 | * If not, then we can safely proceed with the migration. |
4c293dc6 | 858 | * Otherwise, there are no guarantees until the bug is fixed in linux. |
7fc5b13f MH |
859 | */ |
860 | if (!verbs) { | |
02942db7 | 861 | int num_devices, x; |
0bcae623 | 862 | struct ibv_device **dev_list = ibv_get_device_list(&num_devices); |
7fc5b13f MH |
863 | bool roce_found = false; |
864 | bool ib_found = false; | |
865 | ||
866 | for (x = 0; x < num_devices; x++) { | |
867 | verbs = ibv_open_device(dev_list[x]); | |
5b61d575 PR |
868 | if (!verbs) { |
869 | if (errno == EPERM) { | |
870 | continue; | |
871 | } else { | |
872 | return -EINVAL; | |
873 | } | |
874 | } | |
7fc5b13f MH |
875 | |
876 | if (ibv_query_port(verbs, 1, &port_attr)) { | |
877 | ibv_close_device(verbs); | |
878 | ERROR(errp, "Could not query initial IB port"); | |
879 | return -EINVAL; | |
880 | } | |
881 | ||
882 | if (port_attr.link_layer == IBV_LINK_LAYER_INFINIBAND) { | |
883 | ib_found = true; | |
884 | } else if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) { | |
885 | roce_found = true; | |
886 | } | |
887 | ||
888 | ibv_close_device(verbs); | |
889 | ||
890 | } | |
891 | ||
892 | if (roce_found) { | |
893 | if (ib_found) { | |
894 | fprintf(stderr, "WARN: migrations may fail:" | |
895 | " IPv6 over RoCE / iWARP in linux" | |
896 | " is broken. But since you appear to have a" | |
897 | " mixed RoCE / IB environment, be sure to only" | |
898 | " migrate over the IB fabric until the kernel " | |
899 | " fixes the bug.\n"); | |
900 | } else { | |
901 | ERROR(errp, "You only have RoCE / iWARP devices in your systems" | |
902 | " and your management software has specified '[::]'" | |
903 | ", but IPv6 over RoCE / iWARP is not supported in Linux."); | |
904 | return -ENONET; | |
905 | } | |
906 | } | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * If we have a verbs context, that means that some other than '[::]' was | |
02942db7 SW |
913 | * used by the management software for binding. In which case we can |
914 | * actually warn the user about a potentially broken kernel. | |
7fc5b13f MH |
915 | */ |
916 | ||
917 | /* IB ports start with 1, not 0 */ | |
918 | if (ibv_query_port(verbs, 1, &port_attr)) { | |
919 | ERROR(errp, "Could not query initial IB port"); | |
920 | return -EINVAL; | |
921 | } | |
922 | ||
923 | if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) { | |
924 | ERROR(errp, "Linux kernel's RoCE / iWARP does not support IPv6 " | |
925 | "(but patches on linux-rdma in progress)"); | |
926 | return -ENONET; | |
927 | } | |
928 | ||
929 | #endif | |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
2da776db MH |
934 | /* |
935 | * Figure out which RDMA device corresponds to the requested IP hostname | |
936 | * Also create the initial connection manager identifiers for opening | |
937 | * the connection. | |
938 | */ | |
939 | static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp) | |
940 | { | |
941 | int ret; | |
7fc5b13f | 942 | struct rdma_addrinfo *res; |
2da776db MH |
943 | char port_str[16]; |
944 | struct rdma_cm_event *cm_event; | |
945 | char ip[40] = "unknown"; | |
7fc5b13f | 946 | struct rdma_addrinfo *e; |
2da776db MH |
947 | |
948 | if (rdma->host == NULL || !strcmp(rdma->host, "")) { | |
66988941 | 949 | ERROR(errp, "RDMA hostname has not been set"); |
7fc5b13f | 950 | return -EINVAL; |
2da776db MH |
951 | } |
952 | ||
953 | /* create CM channel */ | |
954 | rdma->channel = rdma_create_event_channel(); | |
955 | if (!rdma->channel) { | |
66988941 | 956 | ERROR(errp, "could not create CM channel"); |
7fc5b13f | 957 | return -EINVAL; |
2da776db MH |
958 | } |
959 | ||
960 | /* create CM id */ | |
961 | ret = rdma_create_id(rdma->channel, &rdma->cm_id, NULL, RDMA_PS_TCP); | |
962 | if (ret) { | |
66988941 | 963 | ERROR(errp, "could not create channel id"); |
2da776db MH |
964 | goto err_resolve_create_id; |
965 | } | |
966 | ||
967 | snprintf(port_str, 16, "%d", rdma->port); | |
968 | port_str[15] = '\0'; | |
969 | ||
7fc5b13f | 970 | ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res); |
2da776db | 971 | if (ret < 0) { |
7fc5b13f | 972 | ERROR(errp, "could not rdma_getaddrinfo address %s", rdma->host); |
2da776db MH |
973 | goto err_resolve_get_addr; |
974 | } | |
975 | ||
6470215b MH |
976 | for (e = res; e != NULL; e = e->ai_next) { |
977 | inet_ntop(e->ai_family, | |
7fc5b13f | 978 | &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip); |
733252de | 979 | trace_qemu_rdma_resolve_host_trying(rdma->host, ip); |
2da776db | 980 | |
7fc5b13f | 981 | ret = rdma_resolve_addr(rdma->cm_id, NULL, e->ai_dst_addr, |
6470215b MH |
982 | RDMA_RESOLVE_TIMEOUT_MS); |
983 | if (!ret) { | |
c89aa2f1 | 984 | if (e->ai_family == AF_INET6) { |
bbfb89e3 | 985 | ret = qemu_rdma_broken_ipv6_kernel(rdma->cm_id->verbs, errp); |
c89aa2f1 MH |
986 | if (ret) { |
987 | continue; | |
988 | } | |
7fc5b13f | 989 | } |
6470215b MH |
990 | goto route; |
991 | } | |
2da776db MH |
992 | } |
993 | ||
f53b450a | 994 | rdma_freeaddrinfo(res); |
6470215b MH |
995 | ERROR(errp, "could not resolve address %s", rdma->host); |
996 | goto err_resolve_get_addr; | |
997 | ||
998 | route: | |
f53b450a | 999 | rdma_freeaddrinfo(res); |
2da776db MH |
1000 | qemu_rdma_dump_gid("source_resolve_addr", rdma->cm_id); |
1001 | ||
1002 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
1003 | if (ret) { | |
66988941 | 1004 | ERROR(errp, "could not perform event_addr_resolved"); |
2da776db MH |
1005 | goto err_resolve_get_addr; |
1006 | } | |
1007 | ||
1008 | if (cm_event->event != RDMA_CM_EVENT_ADDR_RESOLVED) { | |
66988941 | 1009 | ERROR(errp, "result not equal to event_addr_resolved %s", |
2da776db | 1010 | rdma_event_str(cm_event->event)); |
e5f60791 | 1011 | error_report("rdma_resolve_addr"); |
2a934347 | 1012 | rdma_ack_cm_event(cm_event); |
7fc5b13f | 1013 | ret = -EINVAL; |
2da776db MH |
1014 | goto err_resolve_get_addr; |
1015 | } | |
1016 | rdma_ack_cm_event(cm_event); | |
1017 | ||
1018 | /* resolve route */ | |
1019 | ret = rdma_resolve_route(rdma->cm_id, RDMA_RESOLVE_TIMEOUT_MS); | |
1020 | if (ret) { | |
66988941 | 1021 | ERROR(errp, "could not resolve rdma route"); |
2da776db MH |
1022 | goto err_resolve_get_addr; |
1023 | } | |
1024 | ||
1025 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
1026 | if (ret) { | |
66988941 | 1027 | ERROR(errp, "could not perform event_route_resolved"); |
2da776db MH |
1028 | goto err_resolve_get_addr; |
1029 | } | |
1030 | if (cm_event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) { | |
66988941 | 1031 | ERROR(errp, "result not equal to event_route_resolved: %s", |
2da776db MH |
1032 | rdma_event_str(cm_event->event)); |
1033 | rdma_ack_cm_event(cm_event); | |
7fc5b13f | 1034 | ret = -EINVAL; |
2da776db MH |
1035 | goto err_resolve_get_addr; |
1036 | } | |
1037 | rdma_ack_cm_event(cm_event); | |
1038 | rdma->verbs = rdma->cm_id->verbs; | |
1039 | qemu_rdma_dump_id("source_resolve_host", rdma->cm_id->verbs); | |
1040 | qemu_rdma_dump_gid("source_resolve_host", rdma->cm_id); | |
1041 | return 0; | |
1042 | ||
1043 | err_resolve_get_addr: | |
1044 | rdma_destroy_id(rdma->cm_id); | |
1045 | rdma->cm_id = NULL; | |
1046 | err_resolve_create_id: | |
1047 | rdma_destroy_event_channel(rdma->channel); | |
1048 | rdma->channel = NULL; | |
7fc5b13f | 1049 | return ret; |
2da776db MH |
1050 | } |
1051 | ||
1052 | /* | |
1053 | * Create protection domain and completion queues | |
1054 | */ | |
1055 | static int qemu_rdma_alloc_pd_cq(RDMAContext *rdma) | |
1056 | { | |
1057 | /* allocate pd */ | |
1058 | rdma->pd = ibv_alloc_pd(rdma->verbs); | |
1059 | if (!rdma->pd) { | |
733252de | 1060 | error_report("failed to allocate protection domain"); |
2da776db MH |
1061 | return -1; |
1062 | } | |
1063 | ||
b390afd8 LZ |
1064 | /* create receive completion channel */ |
1065 | rdma->recv_comp_channel = ibv_create_comp_channel(rdma->verbs); | |
1066 | if (!rdma->recv_comp_channel) { | |
1067 | error_report("failed to allocate receive completion channel"); | |
2da776db MH |
1068 | goto err_alloc_pd_cq; |
1069 | } | |
1070 | ||
1071 | /* | |
b390afd8 | 1072 | * Completion queue can be filled by read work requests. |
2da776db | 1073 | */ |
b390afd8 LZ |
1074 | rdma->recv_cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3), |
1075 | NULL, rdma->recv_comp_channel, 0); | |
1076 | if (!rdma->recv_cq) { | |
1077 | error_report("failed to allocate receive completion queue"); | |
1078 | goto err_alloc_pd_cq; | |
1079 | } | |
1080 | ||
1081 | /* create send completion channel */ | |
1082 | rdma->send_comp_channel = ibv_create_comp_channel(rdma->verbs); | |
1083 | if (!rdma->send_comp_channel) { | |
1084 | error_report("failed to allocate send completion channel"); | |
1085 | goto err_alloc_pd_cq; | |
1086 | } | |
1087 | ||
1088 | rdma->send_cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3), | |
1089 | NULL, rdma->send_comp_channel, 0); | |
1090 | if (!rdma->send_cq) { | |
1091 | error_report("failed to allocate send completion queue"); | |
2da776db MH |
1092 | goto err_alloc_pd_cq; |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | ||
1097 | err_alloc_pd_cq: | |
1098 | if (rdma->pd) { | |
1099 | ibv_dealloc_pd(rdma->pd); | |
1100 | } | |
b390afd8 LZ |
1101 | if (rdma->recv_comp_channel) { |
1102 | ibv_destroy_comp_channel(rdma->recv_comp_channel); | |
1103 | } | |
1104 | if (rdma->send_comp_channel) { | |
1105 | ibv_destroy_comp_channel(rdma->send_comp_channel); | |
1106 | } | |
1107 | if (rdma->recv_cq) { | |
1108 | ibv_destroy_cq(rdma->recv_cq); | |
1109 | rdma->recv_cq = NULL; | |
2da776db MH |
1110 | } |
1111 | rdma->pd = NULL; | |
b390afd8 LZ |
1112 | rdma->recv_comp_channel = NULL; |
1113 | rdma->send_comp_channel = NULL; | |
2da776db MH |
1114 | return -1; |
1115 | ||
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Create queue pairs. | |
1120 | */ | |
1121 | static int qemu_rdma_alloc_qp(RDMAContext *rdma) | |
1122 | { | |
1123 | struct ibv_qp_init_attr attr = { 0 }; | |
1124 | int ret; | |
1125 | ||
1126 | attr.cap.max_send_wr = RDMA_SIGNALED_SEND_MAX; | |
1127 | attr.cap.max_recv_wr = 3; | |
1128 | attr.cap.max_send_sge = 1; | |
1129 | attr.cap.max_recv_sge = 1; | |
b390afd8 LZ |
1130 | attr.send_cq = rdma->send_cq; |
1131 | attr.recv_cq = rdma->recv_cq; | |
2da776db MH |
1132 | attr.qp_type = IBV_QPT_RC; |
1133 | ||
1134 | ret = rdma_create_qp(rdma->cm_id, rdma->pd, &attr); | |
1135 | if (ret) { | |
1136 | return -1; | |
1137 | } | |
1138 | ||
1139 | rdma->qp = rdma->cm_id->qp; | |
1140 | return 0; | |
1141 | } | |
1142 | ||
e2daccb0 LZ |
1143 | /* Check whether On-Demand Paging is supported by RDAM device */ |
1144 | static bool rdma_support_odp(struct ibv_context *dev) | |
1145 | { | |
1146 | struct ibv_device_attr_ex attr = {0}; | |
1147 | int ret = ibv_query_device_ex(dev, NULL, &attr); | |
1148 | if (ret) { | |
1149 | return false; | |
1150 | } | |
1151 | ||
1152 | if (attr.odp_caps.general_caps & IBV_ODP_SUPPORT) { | |
1153 | return true; | |
1154 | } | |
1155 | ||
1156 | return false; | |
1157 | } | |
1158 | ||
911965ac LZ |
1159 | /* |
1160 | * ibv_advise_mr to avoid RNR NAK error as far as possible. | |
1161 | * The responder mr registering with ODP will sent RNR NAK back to | |
1162 | * the requester in the face of the page fault. | |
1163 | */ | |
1164 | static void qemu_rdma_advise_prefetch_mr(struct ibv_pd *pd, uint64_t addr, | |
1165 | uint32_t len, uint32_t lkey, | |
1166 | const char *name, bool wr) | |
1167 | { | |
1168 | #ifdef HAVE_IBV_ADVISE_MR | |
1169 | int ret; | |
1170 | int advice = wr ? IBV_ADVISE_MR_ADVICE_PREFETCH_WRITE : | |
1171 | IBV_ADVISE_MR_ADVICE_PREFETCH; | |
1172 | struct ibv_sge sg_list = {.lkey = lkey, .addr = addr, .length = len}; | |
1173 | ||
1174 | ret = ibv_advise_mr(pd, advice, | |
1175 | IBV_ADVISE_MR_FLAG_FLUSH, &sg_list, 1); | |
1176 | /* ignore the error */ | |
1177 | if (ret) { | |
1178 | trace_qemu_rdma_advise_mr(name, len, addr, strerror(errno)); | |
1179 | } else { | |
1180 | trace_qemu_rdma_advise_mr(name, len, addr, "successed"); | |
1181 | } | |
1182 | #endif | |
1183 | } | |
1184 | ||
2da776db MH |
1185 | static int qemu_rdma_reg_whole_ram_blocks(RDMAContext *rdma) |
1186 | { | |
1187 | int i; | |
1188 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
1189 | ||
1190 | for (i = 0; i < local->nb_blocks; i++) { | |
e2daccb0 LZ |
1191 | int access = IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE; |
1192 | ||
2da776db MH |
1193 | local->block[i].mr = |
1194 | ibv_reg_mr(rdma->pd, | |
1195 | local->block[i].local_host_addr, | |
e2daccb0 | 1196 | local->block[i].length, access |
2da776db | 1197 | ); |
e2daccb0 LZ |
1198 | |
1199 | if (!local->block[i].mr && | |
1200 | errno == ENOTSUP && rdma_support_odp(rdma->verbs)) { | |
1201 | access |= IBV_ACCESS_ON_DEMAND; | |
1202 | /* register ODP mr */ | |
1203 | local->block[i].mr = | |
1204 | ibv_reg_mr(rdma->pd, | |
1205 | local->block[i].local_host_addr, | |
1206 | local->block[i].length, access); | |
1207 | trace_qemu_rdma_register_odp_mr(local->block[i].block_name); | |
911965ac LZ |
1208 | |
1209 | if (local->block[i].mr) { | |
1210 | qemu_rdma_advise_prefetch_mr(rdma->pd, | |
1211 | (uintptr_t)local->block[i].local_host_addr, | |
1212 | local->block[i].length, | |
1213 | local->block[i].mr->lkey, | |
1214 | local->block[i].block_name, | |
1215 | true); | |
1216 | } | |
e2daccb0 LZ |
1217 | } |
1218 | ||
2da776db | 1219 | if (!local->block[i].mr) { |
eb1960aa | 1220 | perror("Failed to register local dest ram block!"); |
2da776db MH |
1221 | break; |
1222 | } | |
1223 | rdma->total_registrations++; | |
1224 | } | |
1225 | ||
1226 | if (i >= local->nb_blocks) { | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | for (i--; i >= 0; i--) { | |
1231 | ibv_dereg_mr(local->block[i].mr); | |
224f364a | 1232 | local->block[i].mr = NULL; |
2da776db MH |
1233 | rdma->total_registrations--; |
1234 | } | |
1235 | ||
1236 | return -1; | |
1237 | ||
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Find the ram block that corresponds to the page requested to be | |
1242 | * transmitted by QEMU. | |
1243 | * | |
1244 | * Once the block is found, also identify which 'chunk' within that | |
1245 | * block that the page belongs to. | |
1246 | * | |
1247 | * This search cannot fail or the migration will fail. | |
1248 | */ | |
1249 | static int qemu_rdma_search_ram_block(RDMAContext *rdma, | |
fbce8c25 | 1250 | uintptr_t block_offset, |
2da776db MH |
1251 | uint64_t offset, |
1252 | uint64_t length, | |
1253 | uint64_t *block_index, | |
1254 | uint64_t *chunk_index) | |
1255 | { | |
1256 | uint64_t current_addr = block_offset + offset; | |
1257 | RDMALocalBlock *block = g_hash_table_lookup(rdma->blockmap, | |
1258 | (void *) block_offset); | |
1259 | assert(block); | |
1260 | assert(current_addr >= block->offset); | |
1261 | assert((current_addr + length) <= (block->offset + block->length)); | |
1262 | ||
1263 | *block_index = block->index; | |
1264 | *chunk_index = ram_chunk_index(block->local_host_addr, | |
1265 | block->local_host_addr + (current_addr - block->offset)); | |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Register a chunk with IB. If the chunk was already registered | |
1272 | * previously, then skip. | |
1273 | * | |
1274 | * Also return the keys associated with the registration needed | |
1275 | * to perform the actual RDMA operation. | |
1276 | */ | |
1277 | static int qemu_rdma_register_and_get_keys(RDMAContext *rdma, | |
3ac040c0 | 1278 | RDMALocalBlock *block, uintptr_t host_addr, |
2da776db MH |
1279 | uint32_t *lkey, uint32_t *rkey, int chunk, |
1280 | uint8_t *chunk_start, uint8_t *chunk_end) | |
1281 | { | |
1282 | if (block->mr) { | |
1283 | if (lkey) { | |
1284 | *lkey = block->mr->lkey; | |
1285 | } | |
1286 | if (rkey) { | |
1287 | *rkey = block->mr->rkey; | |
1288 | } | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | /* allocate memory to store chunk MRs */ | |
1293 | if (!block->pmr) { | |
97f3ad35 | 1294 | block->pmr = g_new0(struct ibv_mr *, block->nb_chunks); |
2da776db MH |
1295 | } |
1296 | ||
1297 | /* | |
1298 | * If 'rkey', then we're the destination, so grant access to the source. | |
1299 | * | |
1300 | * If 'lkey', then we're the source VM, so grant access only to ourselves. | |
1301 | */ | |
1302 | if (!block->pmr[chunk]) { | |
1303 | uint64_t len = chunk_end - chunk_start; | |
e2daccb0 LZ |
1304 | int access = rkey ? IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE : |
1305 | 0; | |
2da776db | 1306 | |
733252de | 1307 | trace_qemu_rdma_register_and_get_keys(len, chunk_start); |
2da776db | 1308 | |
e2daccb0 LZ |
1309 | block->pmr[chunk] = ibv_reg_mr(rdma->pd, chunk_start, len, access); |
1310 | if (!block->pmr[chunk] && | |
1311 | errno == ENOTSUP && rdma_support_odp(rdma->verbs)) { | |
1312 | access |= IBV_ACCESS_ON_DEMAND; | |
1313 | /* register ODP mr */ | |
1314 | block->pmr[chunk] = ibv_reg_mr(rdma->pd, chunk_start, len, access); | |
1315 | trace_qemu_rdma_register_odp_mr(block->block_name); | |
911965ac LZ |
1316 | |
1317 | if (block->pmr[chunk]) { | |
1318 | qemu_rdma_advise_prefetch_mr(rdma->pd, (uintptr_t)chunk_start, | |
1319 | len, block->pmr[chunk]->lkey, | |
1320 | block->block_name, rkey); | |
1321 | ||
1322 | } | |
2da776db | 1323 | } |
2da776db | 1324 | } |
e2daccb0 LZ |
1325 | if (!block->pmr[chunk]) { |
1326 | perror("Failed to register chunk!"); | |
1327 | fprintf(stderr, "Chunk details: block: %d chunk index %d" | |
1328 | " start %" PRIuPTR " end %" PRIuPTR | |
1329 | " host %" PRIuPTR | |
1330 | " local %" PRIuPTR " registrations: %d\n", | |
1331 | block->index, chunk, (uintptr_t)chunk_start, | |
1332 | (uintptr_t)chunk_end, host_addr, | |
1333 | (uintptr_t)block->local_host_addr, | |
1334 | rdma->total_registrations); | |
1335 | return -1; | |
1336 | } | |
1337 | rdma->total_registrations++; | |
2da776db MH |
1338 | |
1339 | if (lkey) { | |
1340 | *lkey = block->pmr[chunk]->lkey; | |
1341 | } | |
1342 | if (rkey) { | |
1343 | *rkey = block->pmr[chunk]->rkey; | |
1344 | } | |
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * Register (at connection time) the memory used for control | |
1350 | * channel messages. | |
1351 | */ | |
1352 | static int qemu_rdma_reg_control(RDMAContext *rdma, int idx) | |
1353 | { | |
1354 | rdma->wr_data[idx].control_mr = ibv_reg_mr(rdma->pd, | |
1355 | rdma->wr_data[idx].control, RDMA_CONTROL_MAX_BUFFER, | |
1356 | IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE); | |
1357 | if (rdma->wr_data[idx].control_mr) { | |
1358 | rdma->total_registrations++; | |
1359 | return 0; | |
1360 | } | |
733252de | 1361 | error_report("qemu_rdma_reg_control failed"); |
2da776db MH |
1362 | return -1; |
1363 | } | |
1364 | ||
1365 | const char *print_wrid(int wrid) | |
1366 | { | |
1367 | if (wrid >= RDMA_WRID_RECV_CONTROL) { | |
1368 | return wrid_desc[RDMA_WRID_RECV_CONTROL]; | |
1369 | } | |
1370 | return wrid_desc[wrid]; | |
1371 | } | |
1372 | ||
2da776db MH |
1373 | /* |
1374 | * Perform a non-optimized memory unregistration after every transfer | |
24ec68ef | 1375 | * for demonstration purposes, only if pin-all is not requested. |
2da776db MH |
1376 | * |
1377 | * Potential optimizations: | |
1378 | * 1. Start a new thread to run this function continuously | |
1379 | - for bit clearing | |
1380 | - and for receipt of unregister messages | |
1381 | * 2. Use an LRU. | |
1382 | * 3. Use workload hints. | |
1383 | */ | |
1384 | static int qemu_rdma_unregister_waiting(RDMAContext *rdma) | |
1385 | { | |
1386 | while (rdma->unregistrations[rdma->unregister_current]) { | |
1387 | int ret; | |
1388 | uint64_t wr_id = rdma->unregistrations[rdma->unregister_current]; | |
1389 | uint64_t chunk = | |
1390 | (wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; | |
1391 | uint64_t index = | |
1392 | (wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; | |
1393 | RDMALocalBlock *block = | |
1394 | &(rdma->local_ram_blocks.block[index]); | |
1395 | RDMARegister reg = { .current_index = index }; | |
1396 | RDMAControlHeader resp = { .type = RDMA_CONTROL_UNREGISTER_FINISHED, | |
1397 | }; | |
1398 | RDMAControlHeader head = { .len = sizeof(RDMARegister), | |
1399 | .type = RDMA_CONTROL_UNREGISTER_REQUEST, | |
1400 | .repeat = 1, | |
1401 | }; | |
1402 | ||
733252de DDAG |
1403 | trace_qemu_rdma_unregister_waiting_proc(chunk, |
1404 | rdma->unregister_current); | |
2da776db MH |
1405 | |
1406 | rdma->unregistrations[rdma->unregister_current] = 0; | |
1407 | rdma->unregister_current++; | |
1408 | ||
1409 | if (rdma->unregister_current == RDMA_SIGNALED_SEND_MAX) { | |
1410 | rdma->unregister_current = 0; | |
1411 | } | |
1412 | ||
1413 | ||
1414 | /* | |
1415 | * Unregistration is speculative (because migration is single-threaded | |
1416 | * and we cannot break the protocol's inifinband message ordering). | |
1417 | * Thus, if the memory is currently being used for transmission, | |
1418 | * then abort the attempt to unregister and try again | |
1419 | * later the next time a completion is received for this memory. | |
1420 | */ | |
1421 | clear_bit(chunk, block->unregister_bitmap); | |
1422 | ||
1423 | if (test_bit(chunk, block->transit_bitmap)) { | |
733252de | 1424 | trace_qemu_rdma_unregister_waiting_inflight(chunk); |
2da776db MH |
1425 | continue; |
1426 | } | |
1427 | ||
733252de | 1428 | trace_qemu_rdma_unregister_waiting_send(chunk); |
2da776db MH |
1429 | |
1430 | ret = ibv_dereg_mr(block->pmr[chunk]); | |
1431 | block->pmr[chunk] = NULL; | |
1432 | block->remote_keys[chunk] = 0; | |
1433 | ||
1434 | if (ret != 0) { | |
1435 | perror("unregistration chunk failed"); | |
1436 | return -ret; | |
1437 | } | |
1438 | rdma->total_registrations--; | |
1439 | ||
1440 | reg.key.chunk = chunk; | |
b12f7777 | 1441 | register_to_network(rdma, ®); |
2da776db MH |
1442 | ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, |
1443 | &resp, NULL, NULL); | |
1444 | if (ret < 0) { | |
1445 | return ret; | |
1446 | } | |
1447 | ||
733252de | 1448 | trace_qemu_rdma_unregister_waiting_complete(chunk); |
2da776db MH |
1449 | } |
1450 | ||
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static uint64_t qemu_rdma_make_wrid(uint64_t wr_id, uint64_t index, | |
1455 | uint64_t chunk) | |
1456 | { | |
1457 | uint64_t result = wr_id & RDMA_WRID_TYPE_MASK; | |
1458 | ||
1459 | result |= (index << RDMA_WRID_BLOCK_SHIFT); | |
1460 | result |= (chunk << RDMA_WRID_CHUNK_SHIFT); | |
1461 | ||
1462 | return result; | |
1463 | } | |
1464 | ||
2da776db MH |
1465 | /* |
1466 | * Consult the connection manager to see a work request | |
1467 | * (of any kind) has completed. | |
1468 | * Return the work request ID that completed. | |
1469 | */ | |
b390afd8 LZ |
1470 | static uint64_t qemu_rdma_poll(RDMAContext *rdma, struct ibv_cq *cq, |
1471 | uint64_t *wr_id_out, uint32_t *byte_len) | |
2da776db MH |
1472 | { |
1473 | int ret; | |
1474 | struct ibv_wc wc; | |
1475 | uint64_t wr_id; | |
1476 | ||
b390afd8 | 1477 | ret = ibv_poll_cq(cq, 1, &wc); |
2da776db MH |
1478 | |
1479 | if (!ret) { | |
1480 | *wr_id_out = RDMA_WRID_NONE; | |
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | if (ret < 0) { | |
733252de | 1485 | error_report("ibv_poll_cq return %d", ret); |
2da776db MH |
1486 | return ret; |
1487 | } | |
1488 | ||
1489 | wr_id = wc.wr_id & RDMA_WRID_TYPE_MASK; | |
1490 | ||
1491 | if (wc.status != IBV_WC_SUCCESS) { | |
1492 | fprintf(stderr, "ibv_poll_cq wc.status=%d %s!\n", | |
1493 | wc.status, ibv_wc_status_str(wc.status)); | |
1494 | fprintf(stderr, "ibv_poll_cq wrid=%s!\n", wrid_desc[wr_id]); | |
1495 | ||
1496 | return -1; | |
1497 | } | |
1498 | ||
1499 | if (rdma->control_ready_expected && | |
1500 | (wr_id >= RDMA_WRID_RECV_CONTROL)) { | |
733252de | 1501 | trace_qemu_rdma_poll_recv(wrid_desc[RDMA_WRID_RECV_CONTROL], |
2da776db MH |
1502 | wr_id - RDMA_WRID_RECV_CONTROL, wr_id, rdma->nb_sent); |
1503 | rdma->control_ready_expected = 0; | |
1504 | } | |
1505 | ||
1506 | if (wr_id == RDMA_WRID_RDMA_WRITE) { | |
1507 | uint64_t chunk = | |
1508 | (wc.wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; | |
1509 | uint64_t index = | |
1510 | (wc.wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; | |
1511 | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[index]); | |
1512 | ||
733252de | 1513 | trace_qemu_rdma_poll_write(print_wrid(wr_id), wr_id, rdma->nb_sent, |
fbce8c25 SW |
1514 | index, chunk, block->local_host_addr, |
1515 | (void *)(uintptr_t)block->remote_host_addr); | |
2da776db MH |
1516 | |
1517 | clear_bit(chunk, block->transit_bitmap); | |
1518 | ||
1519 | if (rdma->nb_sent > 0) { | |
1520 | rdma->nb_sent--; | |
1521 | } | |
2da776db | 1522 | } else { |
733252de | 1523 | trace_qemu_rdma_poll_other(print_wrid(wr_id), wr_id, rdma->nb_sent); |
2da776db MH |
1524 | } |
1525 | ||
1526 | *wr_id_out = wc.wr_id; | |
88571882 IY |
1527 | if (byte_len) { |
1528 | *byte_len = wc.byte_len; | |
1529 | } | |
2da776db MH |
1530 | |
1531 | return 0; | |
1532 | } | |
1533 | ||
9c98cfbe DDAG |
1534 | /* Wait for activity on the completion channel. |
1535 | * Returns 0 on success, none-0 on error. | |
1536 | */ | |
b390afd8 LZ |
1537 | static int qemu_rdma_wait_comp_channel(RDMAContext *rdma, |
1538 | struct ibv_comp_channel *comp_channel) | |
9c98cfbe | 1539 | { |
d5882995 LC |
1540 | struct rdma_cm_event *cm_event; |
1541 | int ret = -1; | |
1542 | ||
9c98cfbe DDAG |
1543 | /* |
1544 | * Coroutine doesn't start until migration_fd_process_incoming() | |
1545 | * so don't yield unless we know we're running inside of a coroutine. | |
1546 | */ | |
f5627c2a LC |
1547 | if (rdma->migration_started_on_destination && |
1548 | migration_incoming_get_current()->state == MIGRATION_STATUS_ACTIVE) { | |
b390afd8 | 1549 | yield_until_fd_readable(comp_channel->fd); |
9c98cfbe DDAG |
1550 | } else { |
1551 | /* This is the source side, we're in a separate thread | |
1552 | * or destination prior to migration_fd_process_incoming() | |
3a4452d8 | 1553 | * after postcopy, the destination also in a separate thread. |
9c98cfbe DDAG |
1554 | * we can't yield; so we have to poll the fd. |
1555 | * But we need to be able to handle 'cancel' or an error | |
1556 | * without hanging forever. | |
1557 | */ | |
1558 | while (!rdma->error_state && !rdma->received_error) { | |
d5882995 | 1559 | GPollFD pfds[2]; |
b390afd8 | 1560 | pfds[0].fd = comp_channel->fd; |
9c98cfbe | 1561 | pfds[0].events = G_IO_IN | G_IO_HUP | G_IO_ERR; |
d5882995 LC |
1562 | pfds[0].revents = 0; |
1563 | ||
1564 | pfds[1].fd = rdma->channel->fd; | |
1565 | pfds[1].events = G_IO_IN | G_IO_HUP | G_IO_ERR; | |
1566 | pfds[1].revents = 0; | |
1567 | ||
9c98cfbe | 1568 | /* 0.1s timeout, should be fine for a 'cancel' */ |
d5882995 LC |
1569 | switch (qemu_poll_ns(pfds, 2, 100 * 1000 * 1000)) { |
1570 | case 2: | |
9c98cfbe | 1571 | case 1: /* fd active */ |
d5882995 LC |
1572 | if (pfds[0].revents) { |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | if (pfds[1].revents) { | |
1577 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
6b8c2eb5 LZ |
1578 | if (ret) { |
1579 | error_report("failed to get cm event while wait " | |
1580 | "completion channel"); | |
1581 | return -EPIPE; | |
d5882995 LC |
1582 | } |
1583 | ||
1584 | error_report("receive cm event while wait comp channel," | |
1585 | "cm event is %d", cm_event->event); | |
1586 | if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED || | |
1587 | cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) { | |
6b8c2eb5 | 1588 | rdma_ack_cm_event(cm_event); |
d5882995 LC |
1589 | return -EPIPE; |
1590 | } | |
6b8c2eb5 | 1591 | rdma_ack_cm_event(cm_event); |
d5882995 LC |
1592 | } |
1593 | break; | |
9c98cfbe DDAG |
1594 | |
1595 | case 0: /* Timeout, go around again */ | |
1596 | break; | |
1597 | ||
1598 | default: /* Error of some type - | |
1599 | * I don't trust errno from qemu_poll_ns | |
1600 | */ | |
1601 | error_report("%s: poll failed", __func__); | |
1602 | return -EPIPE; | |
1603 | } | |
1604 | ||
1605 | if (migrate_get_current()->state == MIGRATION_STATUS_CANCELLING) { | |
1606 | /* Bail out and let the cancellation happen */ | |
1607 | return -EPIPE; | |
1608 | } | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | if (rdma->received_error) { | |
1613 | return -EPIPE; | |
1614 | } | |
1615 | return rdma->error_state; | |
1616 | } | |
1617 | ||
b390afd8 LZ |
1618 | static struct ibv_comp_channel *to_channel(RDMAContext *rdma, int wrid) |
1619 | { | |
1620 | return wrid < RDMA_WRID_RECV_CONTROL ? rdma->send_comp_channel : | |
1621 | rdma->recv_comp_channel; | |
1622 | } | |
1623 | ||
1624 | static struct ibv_cq *to_cq(RDMAContext *rdma, int wrid) | |
1625 | { | |
1626 | return wrid < RDMA_WRID_RECV_CONTROL ? rdma->send_cq : rdma->recv_cq; | |
1627 | } | |
1628 | ||
2da776db MH |
1629 | /* |
1630 | * Block until the next work request has completed. | |
1631 | * | |
1632 | * First poll to see if a work request has already completed, | |
1633 | * otherwise block. | |
1634 | * | |
1635 | * If we encounter completed work requests for IDs other than | |
1636 | * the one we're interested in, then that's generally an error. | |
1637 | * | |
1638 | * The only exception is actual RDMA Write completions. These | |
1639 | * completions only need to be recorded, but do not actually | |
1640 | * need further processing. | |
1641 | */ | |
88571882 IY |
1642 | static int qemu_rdma_block_for_wrid(RDMAContext *rdma, int wrid_requested, |
1643 | uint32_t *byte_len) | |
2da776db MH |
1644 | { |
1645 | int num_cq_events = 0, ret = 0; | |
1646 | struct ibv_cq *cq; | |
1647 | void *cq_ctx; | |
1648 | uint64_t wr_id = RDMA_WRID_NONE, wr_id_in; | |
b390afd8 LZ |
1649 | struct ibv_comp_channel *ch = to_channel(rdma, wrid_requested); |
1650 | struct ibv_cq *poll_cq = to_cq(rdma, wrid_requested); | |
2da776db | 1651 | |
b390afd8 | 1652 | if (ibv_req_notify_cq(poll_cq, 0)) { |
2da776db MH |
1653 | return -1; |
1654 | } | |
1655 | /* poll cq first */ | |
1656 | while (wr_id != wrid_requested) { | |
b390afd8 | 1657 | ret = qemu_rdma_poll(rdma, poll_cq, &wr_id_in, byte_len); |
2da776db MH |
1658 | if (ret < 0) { |
1659 | return ret; | |
1660 | } | |
1661 | ||
1662 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
1663 | ||
1664 | if (wr_id == RDMA_WRID_NONE) { | |
1665 | break; | |
1666 | } | |
1667 | if (wr_id != wrid_requested) { | |
733252de DDAG |
1668 | trace_qemu_rdma_block_for_wrid_miss(print_wrid(wrid_requested), |
1669 | wrid_requested, print_wrid(wr_id), wr_id); | |
2da776db MH |
1670 | } |
1671 | } | |
1672 | ||
1673 | if (wr_id == wrid_requested) { | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | while (1) { | |
b390afd8 | 1678 | ret = qemu_rdma_wait_comp_channel(rdma, ch); |
9c98cfbe DDAG |
1679 | if (ret) { |
1680 | goto err_block_for_wrid; | |
2da776db MH |
1681 | } |
1682 | ||
b390afd8 | 1683 | ret = ibv_get_cq_event(ch, &cq, &cq_ctx); |
0b3c15f0 | 1684 | if (ret) { |
2da776db MH |
1685 | perror("ibv_get_cq_event"); |
1686 | goto err_block_for_wrid; | |
1687 | } | |
1688 | ||
1689 | num_cq_events++; | |
1690 | ||
0b3c15f0 DDAG |
1691 | ret = -ibv_req_notify_cq(cq, 0); |
1692 | if (ret) { | |
2da776db MH |
1693 | goto err_block_for_wrid; |
1694 | } | |
1695 | ||
1696 | while (wr_id != wrid_requested) { | |
b390afd8 | 1697 | ret = qemu_rdma_poll(rdma, poll_cq, &wr_id_in, byte_len); |
2da776db MH |
1698 | if (ret < 0) { |
1699 | goto err_block_for_wrid; | |
1700 | } | |
1701 | ||
1702 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
1703 | ||
1704 | if (wr_id == RDMA_WRID_NONE) { | |
1705 | break; | |
1706 | } | |
1707 | if (wr_id != wrid_requested) { | |
733252de DDAG |
1708 | trace_qemu_rdma_block_for_wrid_miss(print_wrid(wrid_requested), |
1709 | wrid_requested, print_wrid(wr_id), wr_id); | |
2da776db MH |
1710 | } |
1711 | } | |
1712 | ||
1713 | if (wr_id == wrid_requested) { | |
1714 | goto success_block_for_wrid; | |
1715 | } | |
1716 | } | |
1717 | ||
1718 | success_block_for_wrid: | |
1719 | if (num_cq_events) { | |
1720 | ibv_ack_cq_events(cq, num_cq_events); | |
1721 | } | |
1722 | return 0; | |
1723 | ||
1724 | err_block_for_wrid: | |
1725 | if (num_cq_events) { | |
1726 | ibv_ack_cq_events(cq, num_cq_events); | |
1727 | } | |
0b3c15f0 DDAG |
1728 | |
1729 | rdma->error_state = ret; | |
2da776db MH |
1730 | return ret; |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * Post a SEND message work request for the control channel | |
1735 | * containing some data and block until the post completes. | |
1736 | */ | |
1737 | static int qemu_rdma_post_send_control(RDMAContext *rdma, uint8_t *buf, | |
1738 | RDMAControlHeader *head) | |
1739 | { | |
1740 | int ret = 0; | |
1f22364b | 1741 | RDMAWorkRequestData *wr = &rdma->wr_data[RDMA_WRID_CONTROL]; |
2da776db MH |
1742 | struct ibv_send_wr *bad_wr; |
1743 | struct ibv_sge sge = { | |
fbce8c25 | 1744 | .addr = (uintptr_t)(wr->control), |
2da776db MH |
1745 | .length = head->len + sizeof(RDMAControlHeader), |
1746 | .lkey = wr->control_mr->lkey, | |
1747 | }; | |
1748 | struct ibv_send_wr send_wr = { | |
1749 | .wr_id = RDMA_WRID_SEND_CONTROL, | |
1750 | .opcode = IBV_WR_SEND, | |
1751 | .send_flags = IBV_SEND_SIGNALED, | |
1752 | .sg_list = &sge, | |
1753 | .num_sge = 1, | |
1754 | }; | |
1755 | ||
482a33c5 | 1756 | trace_qemu_rdma_post_send_control(control_desc(head->type)); |
2da776db MH |
1757 | |
1758 | /* | |
1759 | * We don't actually need to do a memcpy() in here if we used | |
1760 | * the "sge" properly, but since we're only sending control messages | |
1761 | * (not RAM in a performance-critical path), then its OK for now. | |
1762 | * | |
1763 | * The copy makes the RDMAControlHeader simpler to manipulate | |
1764 | * for the time being. | |
1765 | */ | |
6f1484ed | 1766 | assert(head->len <= RDMA_CONTROL_MAX_BUFFER - sizeof(*head)); |
2da776db MH |
1767 | memcpy(wr->control, head, sizeof(RDMAControlHeader)); |
1768 | control_to_network((void *) wr->control); | |
1769 | ||
1770 | if (buf) { | |
1771 | memcpy(wr->control + sizeof(RDMAControlHeader), buf, head->len); | |
1772 | } | |
1773 | ||
1774 | ||
e325b49a | 1775 | ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); |
2da776db | 1776 | |
e325b49a | 1777 | if (ret > 0) { |
733252de | 1778 | error_report("Failed to use post IB SEND for control"); |
e325b49a | 1779 | return -ret; |
2da776db MH |
1780 | } |
1781 | ||
88571882 | 1782 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_SEND_CONTROL, NULL); |
2da776db | 1783 | if (ret < 0) { |
733252de | 1784 | error_report("rdma migration: send polling control error"); |
2da776db MH |
1785 | } |
1786 | ||
1787 | return ret; | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Post a RECV work request in anticipation of some future receipt | |
1792 | * of data on the control channel. | |
1793 | */ | |
1794 | static int qemu_rdma_post_recv_control(RDMAContext *rdma, int idx) | |
1795 | { | |
1796 | struct ibv_recv_wr *bad_wr; | |
1797 | struct ibv_sge sge = { | |
fbce8c25 | 1798 | .addr = (uintptr_t)(rdma->wr_data[idx].control), |
2da776db MH |
1799 | .length = RDMA_CONTROL_MAX_BUFFER, |
1800 | .lkey = rdma->wr_data[idx].control_mr->lkey, | |
1801 | }; | |
1802 | ||
1803 | struct ibv_recv_wr recv_wr = { | |
1804 | .wr_id = RDMA_WRID_RECV_CONTROL + idx, | |
1805 | .sg_list = &sge, | |
1806 | .num_sge = 1, | |
1807 | }; | |
1808 | ||
1809 | ||
1810 | if (ibv_post_recv(rdma->qp, &recv_wr, &bad_wr)) { | |
1811 | return -1; | |
1812 | } | |
1813 | ||
1814 | return 0; | |
1815 | } | |
1816 | ||
1817 | /* | |
1818 | * Block and wait for a RECV control channel message to arrive. | |
1819 | */ | |
1820 | static int qemu_rdma_exchange_get_response(RDMAContext *rdma, | |
1821 | RDMAControlHeader *head, int expecting, int idx) | |
1822 | { | |
88571882 IY |
1823 | uint32_t byte_len; |
1824 | int ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RECV_CONTROL + idx, | |
1825 | &byte_len); | |
2da776db MH |
1826 | |
1827 | if (ret < 0) { | |
733252de | 1828 | error_report("rdma migration: recv polling control error!"); |
2da776db MH |
1829 | return ret; |
1830 | } | |
1831 | ||
1832 | network_to_control((void *) rdma->wr_data[idx].control); | |
1833 | memcpy(head, rdma->wr_data[idx].control, sizeof(RDMAControlHeader)); | |
1834 | ||
482a33c5 | 1835 | trace_qemu_rdma_exchange_get_response_start(control_desc(expecting)); |
2da776db MH |
1836 | |
1837 | if (expecting == RDMA_CONTROL_NONE) { | |
482a33c5 | 1838 | trace_qemu_rdma_exchange_get_response_none(control_desc(head->type), |
733252de | 1839 | head->type); |
2da776db | 1840 | } else if (head->type != expecting || head->type == RDMA_CONTROL_ERROR) { |
733252de DDAG |
1841 | error_report("Was expecting a %s (%d) control message" |
1842 | ", but got: %s (%d), length: %d", | |
482a33c5 DDAG |
1843 | control_desc(expecting), expecting, |
1844 | control_desc(head->type), head->type, head->len); | |
cd5ea070 DDAG |
1845 | if (head->type == RDMA_CONTROL_ERROR) { |
1846 | rdma->received_error = true; | |
1847 | } | |
2da776db MH |
1848 | return -EIO; |
1849 | } | |
6f1484ed | 1850 | if (head->len > RDMA_CONTROL_MAX_BUFFER - sizeof(*head)) { |
81b07353 | 1851 | error_report("too long length: %d", head->len); |
6f1484ed IY |
1852 | return -EINVAL; |
1853 | } | |
88571882 | 1854 | if (sizeof(*head) + head->len != byte_len) { |
733252de | 1855 | error_report("Malformed length: %d byte_len %d", head->len, byte_len); |
88571882 IY |
1856 | return -EINVAL; |
1857 | } | |
2da776db MH |
1858 | |
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * When a RECV work request has completed, the work request's | |
1864 | * buffer is pointed at the header. | |
1865 | * | |
1866 | * This will advance the pointer to the data portion | |
1867 | * of the control message of the work request's buffer that | |
1868 | * was populated after the work request finished. | |
1869 | */ | |
1870 | static void qemu_rdma_move_header(RDMAContext *rdma, int idx, | |
1871 | RDMAControlHeader *head) | |
1872 | { | |
1873 | rdma->wr_data[idx].control_len = head->len; | |
1874 | rdma->wr_data[idx].control_curr = | |
1875 | rdma->wr_data[idx].control + sizeof(RDMAControlHeader); | |
1876 | } | |
1877 | ||
1878 | /* | |
1879 | * This is an 'atomic' high-level operation to deliver a single, unified | |
1880 | * control-channel message. | |
1881 | * | |
1882 | * Additionally, if the user is expecting some kind of reply to this message, | |
1883 | * they can request a 'resp' response message be filled in by posting an | |
1884 | * additional work request on behalf of the user and waiting for an additional | |
1885 | * completion. | |
1886 | * | |
1887 | * The extra (optional) response is used during registration to us from having | |
1888 | * to perform an *additional* exchange of message just to provide a response by | |
1889 | * instead piggy-backing on the acknowledgement. | |
1890 | */ | |
1891 | static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, | |
1892 | uint8_t *data, RDMAControlHeader *resp, | |
1893 | int *resp_idx, | |
1894 | int (*callback)(RDMAContext *rdma)) | |
1895 | { | |
1896 | int ret = 0; | |
1897 | ||
1898 | /* | |
1899 | * Wait until the dest is ready before attempting to deliver the message | |
1900 | * by waiting for a READY message. | |
1901 | */ | |
1902 | if (rdma->control_ready_expected) { | |
1903 | RDMAControlHeader resp; | |
1904 | ret = qemu_rdma_exchange_get_response(rdma, | |
1905 | &resp, RDMA_CONTROL_READY, RDMA_WRID_READY); | |
1906 | if (ret < 0) { | |
1907 | return ret; | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * If the user is expecting a response, post a WR in anticipation of it. | |
1913 | */ | |
1914 | if (resp) { | |
1915 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_DATA); | |
1916 | if (ret) { | |
733252de | 1917 | error_report("rdma migration: error posting" |
2da776db MH |
1918 | " extra control recv for anticipated result!"); |
1919 | return ret; | |
1920 | } | |
1921 | } | |
1922 | ||
1923 | /* | |
1924 | * Post a WR to replace the one we just consumed for the READY message. | |
1925 | */ | |
1926 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); | |
1927 | if (ret) { | |
733252de | 1928 | error_report("rdma migration: error posting first control recv!"); |
2da776db MH |
1929 | return ret; |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * Deliver the control message that was requested. | |
1934 | */ | |
1935 | ret = qemu_rdma_post_send_control(rdma, data, head); | |
1936 | ||
1937 | if (ret < 0) { | |
733252de | 1938 | error_report("Failed to send control buffer!"); |
2da776db MH |
1939 | return ret; |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * If we're expecting a response, block and wait for it. | |
1944 | */ | |
1945 | if (resp) { | |
1946 | if (callback) { | |
733252de | 1947 | trace_qemu_rdma_exchange_send_issue_callback(); |
2da776db MH |
1948 | ret = callback(rdma); |
1949 | if (ret < 0) { | |
1950 | return ret; | |
1951 | } | |
1952 | } | |
1953 | ||
482a33c5 | 1954 | trace_qemu_rdma_exchange_send_waiting(control_desc(resp->type)); |
2da776db MH |
1955 | ret = qemu_rdma_exchange_get_response(rdma, resp, |
1956 | resp->type, RDMA_WRID_DATA); | |
1957 | ||
1958 | if (ret < 0) { | |
1959 | return ret; | |
1960 | } | |
1961 | ||
1962 | qemu_rdma_move_header(rdma, RDMA_WRID_DATA, resp); | |
1963 | if (resp_idx) { | |
1964 | *resp_idx = RDMA_WRID_DATA; | |
1965 | } | |
482a33c5 | 1966 | trace_qemu_rdma_exchange_send_received(control_desc(resp->type)); |
2da776db MH |
1967 | } |
1968 | ||
1969 | rdma->control_ready_expected = 1; | |
1970 | ||
1971 | return 0; | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * This is an 'atomic' high-level operation to receive a single, unified | |
1976 | * control-channel message. | |
1977 | */ | |
1978 | static int qemu_rdma_exchange_recv(RDMAContext *rdma, RDMAControlHeader *head, | |
1979 | int expecting) | |
1980 | { | |
1981 | RDMAControlHeader ready = { | |
1982 | .len = 0, | |
1983 | .type = RDMA_CONTROL_READY, | |
1984 | .repeat = 1, | |
1985 | }; | |
1986 | int ret; | |
1987 | ||
1988 | /* | |
1989 | * Inform the source that we're ready to receive a message. | |
1990 | */ | |
1991 | ret = qemu_rdma_post_send_control(rdma, NULL, &ready); | |
1992 | ||
1993 | if (ret < 0) { | |
733252de | 1994 | error_report("Failed to send control buffer!"); |
2da776db MH |
1995 | return ret; |
1996 | } | |
1997 | ||
1998 | /* | |
1999 | * Block and wait for the message. | |
2000 | */ | |
2001 | ret = qemu_rdma_exchange_get_response(rdma, head, | |
2002 | expecting, RDMA_WRID_READY); | |
2003 | ||
2004 | if (ret < 0) { | |
2005 | return ret; | |
2006 | } | |
2007 | ||
2008 | qemu_rdma_move_header(rdma, RDMA_WRID_READY, head); | |
2009 | ||
2010 | /* | |
2011 | * Post a new RECV work request to replace the one we just consumed. | |
2012 | */ | |
2013 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); | |
2014 | if (ret) { | |
733252de | 2015 | error_report("rdma migration: error posting second control recv!"); |
2da776db MH |
2016 | return ret; |
2017 | } | |
2018 | ||
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Write an actual chunk of memory using RDMA. | |
2024 | * | |
2025 | * If we're using dynamic registration on the dest-side, we have to | |
2026 | * send a registration command first. | |
2027 | */ | |
2028 | static int qemu_rdma_write_one(QEMUFile *f, RDMAContext *rdma, | |
2029 | int current_index, uint64_t current_addr, | |
2030 | uint64_t length) | |
2031 | { | |
2032 | struct ibv_sge sge; | |
2033 | struct ibv_send_wr send_wr = { 0 }; | |
2034 | struct ibv_send_wr *bad_wr; | |
2035 | int reg_result_idx, ret, count = 0; | |
2036 | uint64_t chunk, chunks; | |
2037 | uint8_t *chunk_start, *chunk_end; | |
2038 | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[current_index]); | |
2039 | RDMARegister reg; | |
2040 | RDMARegisterResult *reg_result; | |
2041 | RDMAControlHeader resp = { .type = RDMA_CONTROL_REGISTER_RESULT }; | |
2042 | RDMAControlHeader head = { .len = sizeof(RDMARegister), | |
2043 | .type = RDMA_CONTROL_REGISTER_REQUEST, | |
2044 | .repeat = 1, | |
2045 | }; | |
2046 | ||
2047 | retry: | |
fbce8c25 | 2048 | sge.addr = (uintptr_t)(block->local_host_addr + |
2da776db MH |
2049 | (current_addr - block->offset)); |
2050 | sge.length = length; | |
2051 | ||
fbce8c25 SW |
2052 | chunk = ram_chunk_index(block->local_host_addr, |
2053 | (uint8_t *)(uintptr_t)sge.addr); | |
2da776db MH |
2054 | chunk_start = ram_chunk_start(block, chunk); |
2055 | ||
2056 | if (block->is_ram_block) { | |
2057 | chunks = length / (1UL << RDMA_REG_CHUNK_SHIFT); | |
2058 | ||
2059 | if (chunks && ((length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { | |
2060 | chunks--; | |
2061 | } | |
2062 | } else { | |
2063 | chunks = block->length / (1UL << RDMA_REG_CHUNK_SHIFT); | |
2064 | ||
2065 | if (chunks && ((block->length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { | |
2066 | chunks--; | |
2067 | } | |
2068 | } | |
2069 | ||
733252de DDAG |
2070 | trace_qemu_rdma_write_one_top(chunks + 1, |
2071 | (chunks + 1) * | |
2072 | (1UL << RDMA_REG_CHUNK_SHIFT) / 1024 / 1024); | |
2da776db MH |
2073 | |
2074 | chunk_end = ram_chunk_end(block, chunk + chunks); | |
2075 | ||
2da776db MH |
2076 | |
2077 | while (test_bit(chunk, block->transit_bitmap)) { | |
2078 | (void)count; | |
733252de | 2079 | trace_qemu_rdma_write_one_block(count++, current_index, chunk, |
2da776db MH |
2080 | sge.addr, length, rdma->nb_sent, block->nb_chunks); |
2081 | ||
88571882 | 2082 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); |
2da776db MH |
2083 | |
2084 | if (ret < 0) { | |
733252de | 2085 | error_report("Failed to Wait for previous write to complete " |
2da776db | 2086 | "block %d chunk %" PRIu64 |
733252de | 2087 | " current %" PRIu64 " len %" PRIu64 " %d", |
2da776db MH |
2088 | current_index, chunk, sge.addr, length, rdma->nb_sent); |
2089 | return ret; | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | if (!rdma->pin_all || !block->is_ram_block) { | |
2094 | if (!block->remote_keys[chunk]) { | |
2095 | /* | |
2096 | * This chunk has not yet been registered, so first check to see | |
2097 | * if the entire chunk is zero. If so, tell the other size to | |
2098 | * memset() + madvise() the entire chunk without RDMA. | |
2099 | */ | |
2100 | ||
a1febc49 | 2101 | if (buffer_is_zero((void *)(uintptr_t)sge.addr, length)) { |
2da776db MH |
2102 | RDMACompress comp = { |
2103 | .offset = current_addr, | |
2104 | .value = 0, | |
2105 | .block_idx = current_index, | |
2106 | .length = length, | |
2107 | }; | |
2108 | ||
2109 | head.len = sizeof(comp); | |
2110 | head.type = RDMA_CONTROL_COMPRESS; | |
2111 | ||
733252de DDAG |
2112 | trace_qemu_rdma_write_one_zero(chunk, sge.length, |
2113 | current_index, current_addr); | |
2da776db | 2114 | |
b12f7777 | 2115 | compress_to_network(rdma, &comp); |
2da776db MH |
2116 | ret = qemu_rdma_exchange_send(rdma, &head, |
2117 | (uint8_t *) &comp, NULL, NULL, NULL); | |
2118 | ||
2119 | if (ret < 0) { | |
2120 | return -EIO; | |
2121 | } | |
2122 | ||
2123 | acct_update_position(f, sge.length, true); | |
2124 | ||
2125 | return 1; | |
2126 | } | |
2127 | ||
2128 | /* | |
2129 | * Otherwise, tell other side to register. | |
2130 | */ | |
2131 | reg.current_index = current_index; | |
2132 | if (block->is_ram_block) { | |
2133 | reg.key.current_addr = current_addr; | |
2134 | } else { | |
2135 | reg.key.chunk = chunk; | |
2136 | } | |
2137 | reg.chunks = chunks; | |
2138 | ||
733252de DDAG |
2139 | trace_qemu_rdma_write_one_sendreg(chunk, sge.length, current_index, |
2140 | current_addr); | |
2da776db | 2141 | |
b12f7777 | 2142 | register_to_network(rdma, ®); |
2da776db MH |
2143 | ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, |
2144 | &resp, ®_result_idx, NULL); | |
2145 | if (ret < 0) { | |
2146 | return ret; | |
2147 | } | |
2148 | ||
2149 | /* try to overlap this single registration with the one we sent. */ | |
3ac040c0 | 2150 | if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, |
2da776db MH |
2151 | &sge.lkey, NULL, chunk, |
2152 | chunk_start, chunk_end)) { | |
733252de | 2153 | error_report("cannot get lkey"); |
2da776db MH |
2154 | return -EINVAL; |
2155 | } | |
2156 | ||
2157 | reg_result = (RDMARegisterResult *) | |
2158 | rdma->wr_data[reg_result_idx].control_curr; | |
2159 | ||
2160 | network_to_result(reg_result); | |
2161 | ||
733252de DDAG |
2162 | trace_qemu_rdma_write_one_recvregres(block->remote_keys[chunk], |
2163 | reg_result->rkey, chunk); | |
2da776db MH |
2164 | |
2165 | block->remote_keys[chunk] = reg_result->rkey; | |
2166 | block->remote_host_addr = reg_result->host_addr; | |
2167 | } else { | |
2168 | /* already registered before */ | |
3ac040c0 | 2169 | if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, |
2da776db MH |
2170 | &sge.lkey, NULL, chunk, |
2171 | chunk_start, chunk_end)) { | |
733252de | 2172 | error_report("cannot get lkey!"); |
2da776db MH |
2173 | return -EINVAL; |
2174 | } | |
2175 | } | |
2176 | ||
2177 | send_wr.wr.rdma.rkey = block->remote_keys[chunk]; | |
2178 | } else { | |
2179 | send_wr.wr.rdma.rkey = block->remote_rkey; | |
2180 | ||
3ac040c0 | 2181 | if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, |
2da776db MH |
2182 | &sge.lkey, NULL, chunk, |
2183 | chunk_start, chunk_end)) { | |
733252de | 2184 | error_report("cannot get lkey!"); |
2da776db MH |
2185 | return -EINVAL; |
2186 | } | |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * Encode the ram block index and chunk within this wrid. | |
2191 | * We will use this information at the time of completion | |
2192 | * to figure out which bitmap to check against and then which | |
2193 | * chunk in the bitmap to look for. | |
2194 | */ | |
2195 | send_wr.wr_id = qemu_rdma_make_wrid(RDMA_WRID_RDMA_WRITE, | |
2196 | current_index, chunk); | |
2197 | ||
2198 | send_wr.opcode = IBV_WR_RDMA_WRITE; | |
2199 | send_wr.send_flags = IBV_SEND_SIGNALED; | |
2200 | send_wr.sg_list = &sge; | |
2201 | send_wr.num_sge = 1; | |
2202 | send_wr.wr.rdma.remote_addr = block->remote_host_addr + | |
2203 | (current_addr - block->offset); | |
2204 | ||
733252de DDAG |
2205 | trace_qemu_rdma_write_one_post(chunk, sge.addr, send_wr.wr.rdma.remote_addr, |
2206 | sge.length); | |
2da776db MH |
2207 | |
2208 | /* | |
2209 | * ibv_post_send() does not return negative error numbers, | |
2210 | * per the specification they are positive - no idea why. | |
2211 | */ | |
2212 | ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); | |
2213 | ||
2214 | if (ret == ENOMEM) { | |
733252de | 2215 | trace_qemu_rdma_write_one_queue_full(); |
88571882 | 2216 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); |
2da776db | 2217 | if (ret < 0) { |
733252de DDAG |
2218 | error_report("rdma migration: failed to make " |
2219 | "room in full send queue! %d", ret); | |
2da776db MH |
2220 | return ret; |
2221 | } | |
2222 | ||
2223 | goto retry; | |
2224 | ||
2225 | } else if (ret > 0) { | |
2226 | perror("rdma migration: post rdma write failed"); | |
2227 | return -ret; | |
2228 | } | |
2229 | ||
2230 | set_bit(chunk, block->transit_bitmap); | |
2231 | acct_update_position(f, sge.length, false); | |
2232 | rdma->total_writes++; | |
2233 | ||
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | /* | |
2238 | * Push out any unwritten RDMA operations. | |
2239 | * | |
2240 | * We support sending out multiple chunks at the same time. | |
2241 | * Not all of them need to get signaled in the completion queue. | |
2242 | */ | |
2243 | static int qemu_rdma_write_flush(QEMUFile *f, RDMAContext *rdma) | |
2244 | { | |
2245 | int ret; | |
2246 | ||
2247 | if (!rdma->current_length) { | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | ret = qemu_rdma_write_one(f, rdma, | |
2252 | rdma->current_index, rdma->current_addr, rdma->current_length); | |
2253 | ||
2254 | if (ret < 0) { | |
2255 | return ret; | |
2256 | } | |
2257 | ||
2258 | if (ret == 0) { | |
2259 | rdma->nb_sent++; | |
733252de | 2260 | trace_qemu_rdma_write_flush(rdma->nb_sent); |
2da776db MH |
2261 | } |
2262 | ||
2263 | rdma->current_length = 0; | |
2264 | rdma->current_addr = 0; | |
2265 | ||
2266 | return 0; | |
2267 | } | |
2268 | ||
2269 | static inline int qemu_rdma_buffer_mergable(RDMAContext *rdma, | |
2270 | uint64_t offset, uint64_t len) | |
2271 | { | |
44b59494 IY |
2272 | RDMALocalBlock *block; |
2273 | uint8_t *host_addr; | |
2274 | uint8_t *chunk_end; | |
2275 | ||
2276 | if (rdma->current_index < 0) { | |
2277 | return 0; | |
2278 | } | |
2279 | ||
2280 | if (rdma->current_chunk < 0) { | |
2281 | return 0; | |
2282 | } | |
2283 | ||
2284 | block = &(rdma->local_ram_blocks.block[rdma->current_index]); | |
2285 | host_addr = block->local_host_addr + (offset - block->offset); | |
2286 | chunk_end = ram_chunk_end(block, rdma->current_chunk); | |
2da776db MH |
2287 | |
2288 | if (rdma->current_length == 0) { | |
2289 | return 0; | |
2290 | } | |
2291 | ||
2292 | /* | |
2293 | * Only merge into chunk sequentially. | |
2294 | */ | |
2295 | if (offset != (rdma->current_addr + rdma->current_length)) { | |
2296 | return 0; | |
2297 | } | |
2298 | ||
2da776db MH |
2299 | if (offset < block->offset) { |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | if ((offset + len) > (block->offset + block->length)) { | |
2304 | return 0; | |
2305 | } | |
2306 | ||
2da776db MH |
2307 | if ((host_addr + len) > chunk_end) { |
2308 | return 0; | |
2309 | } | |
2310 | ||
2311 | return 1; | |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * We're not actually writing here, but doing three things: | |
2316 | * | |
2317 | * 1. Identify the chunk the buffer belongs to. | |
2318 | * 2. If the chunk is full or the buffer doesn't belong to the current | |
2319 | * chunk, then start a new chunk and flush() the old chunk. | |
2320 | * 3. To keep the hardware busy, we also group chunks into batches | |
2321 | * and only require that a batch gets acknowledged in the completion | |
3a4452d8 | 2322 | * queue instead of each individual chunk. |
2da776db MH |
2323 | */ |
2324 | static int qemu_rdma_write(QEMUFile *f, RDMAContext *rdma, | |
2325 | uint64_t block_offset, uint64_t offset, | |
2326 | uint64_t len) | |
2327 | { | |
2328 | uint64_t current_addr = block_offset + offset; | |
2329 | uint64_t index = rdma->current_index; | |
2330 | uint64_t chunk = rdma->current_chunk; | |
2331 | int ret; | |
2332 | ||
2333 | /* If we cannot merge it, we flush the current buffer first. */ | |
2334 | if (!qemu_rdma_buffer_mergable(rdma, current_addr, len)) { | |
2335 | ret = qemu_rdma_write_flush(f, rdma); | |
2336 | if (ret) { | |
2337 | return ret; | |
2338 | } | |
2339 | rdma->current_length = 0; | |
2340 | rdma->current_addr = current_addr; | |
2341 | ||
2342 | ret = qemu_rdma_search_ram_block(rdma, block_offset, | |
2343 | offset, len, &index, &chunk); | |
2344 | if (ret) { | |
733252de | 2345 | error_report("ram block search failed"); |
2da776db MH |
2346 | return ret; |
2347 | } | |
2348 | rdma->current_index = index; | |
2349 | rdma->current_chunk = chunk; | |
2350 | } | |
2351 | ||
2352 | /* merge it */ | |
2353 | rdma->current_length += len; | |
2354 | ||
2355 | /* flush it if buffer is too large */ | |
2356 | if (rdma->current_length >= RDMA_MERGE_MAX) { | |
2357 | return qemu_rdma_write_flush(f, rdma); | |
2358 | } | |
2359 | ||
2360 | return 0; | |
2361 | } | |
2362 | ||
2363 | static void qemu_rdma_cleanup(RDMAContext *rdma) | |
2364 | { | |
c5e76115 | 2365 | int idx; |
2da776db | 2366 | |
5a91337c | 2367 | if (rdma->cm_id && rdma->connected) { |
32bce196 DDAG |
2368 | if ((rdma->error_state || |
2369 | migrate_get_current()->state == MIGRATION_STATUS_CANCELLING) && | |
2370 | !rdma->received_error) { | |
2da776db MH |
2371 | RDMAControlHeader head = { .len = 0, |
2372 | .type = RDMA_CONTROL_ERROR, | |
2373 | .repeat = 1, | |
2374 | }; | |
733252de | 2375 | error_report("Early error. Sending error."); |
2da776db MH |
2376 | qemu_rdma_post_send_control(rdma, NULL, &head); |
2377 | } | |
2378 | ||
c5e76115 | 2379 | rdma_disconnect(rdma->cm_id); |
733252de | 2380 | trace_qemu_rdma_cleanup_disconnect(); |
5a91337c | 2381 | rdma->connected = false; |
2da776db MH |
2382 | } |
2383 | ||
cf75e268 DDAG |
2384 | if (rdma->channel) { |
2385 | qemu_set_fd_handler(rdma->channel->fd, NULL, NULL, NULL); | |
2386 | } | |
a97270ad DDAG |
2387 | g_free(rdma->dest_blocks); |
2388 | rdma->dest_blocks = NULL; | |
2da776db | 2389 | |
1f22364b | 2390 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
2391 | if (rdma->wr_data[idx].control_mr) { |
2392 | rdma->total_registrations--; | |
2393 | ibv_dereg_mr(rdma->wr_data[idx].control_mr); | |
2394 | } | |
2395 | rdma->wr_data[idx].control_mr = NULL; | |
2396 | } | |
2397 | ||
2398 | if (rdma->local_ram_blocks.block) { | |
2399 | while (rdma->local_ram_blocks.nb_blocks) { | |
03fcab38 | 2400 | rdma_delete_block(rdma, &rdma->local_ram_blocks.block[0]); |
2da776db MH |
2401 | } |
2402 | } | |
2403 | ||
80b262e1 PR |
2404 | if (rdma->qp) { |
2405 | rdma_destroy_qp(rdma->cm_id); | |
2406 | rdma->qp = NULL; | |
2407 | } | |
b390afd8 LZ |
2408 | if (rdma->recv_cq) { |
2409 | ibv_destroy_cq(rdma->recv_cq); | |
2410 | rdma->recv_cq = NULL; | |
2411 | } | |
2412 | if (rdma->send_cq) { | |
2413 | ibv_destroy_cq(rdma->send_cq); | |
2414 | rdma->send_cq = NULL; | |
2415 | } | |
2416 | if (rdma->recv_comp_channel) { | |
2417 | ibv_destroy_comp_channel(rdma->recv_comp_channel); | |
2418 | rdma->recv_comp_channel = NULL; | |
2da776db | 2419 | } |
b390afd8 LZ |
2420 | if (rdma->send_comp_channel) { |
2421 | ibv_destroy_comp_channel(rdma->send_comp_channel); | |
2422 | rdma->send_comp_channel = NULL; | |
2da776db MH |
2423 | } |
2424 | if (rdma->pd) { | |
2425 | ibv_dealloc_pd(rdma->pd); | |
2426 | rdma->pd = NULL; | |
2427 | } | |
2da776db MH |
2428 | if (rdma->cm_id) { |
2429 | rdma_destroy_id(rdma->cm_id); | |
2430 | rdma->cm_id = NULL; | |
2431 | } | |
55cc1b59 LC |
2432 | |
2433 | /* the destination side, listen_id and channel is shared */ | |
80b262e1 | 2434 | if (rdma->listen_id) { |
55cc1b59 LC |
2435 | if (!rdma->is_return_path) { |
2436 | rdma_destroy_id(rdma->listen_id); | |
2437 | } | |
80b262e1 | 2438 | rdma->listen_id = NULL; |
55cc1b59 LC |
2439 | |
2440 | if (rdma->channel) { | |
2441 | if (!rdma->is_return_path) { | |
2442 | rdma_destroy_event_channel(rdma->channel); | |
2443 | } | |
2444 | rdma->channel = NULL; | |
2445 | } | |
80b262e1 | 2446 | } |
55cc1b59 | 2447 | |
2da776db MH |
2448 | if (rdma->channel) { |
2449 | rdma_destroy_event_channel(rdma->channel); | |
2450 | rdma->channel = NULL; | |
2451 | } | |
e1d0fb37 | 2452 | g_free(rdma->host); |
44bcfd45 | 2453 | g_free(rdma->host_port); |
e1d0fb37 | 2454 | rdma->host = NULL; |
44bcfd45 | 2455 | rdma->host_port = NULL; |
2da776db MH |
2456 | } |
2457 | ||
2458 | ||
bbfb89e3 | 2459 | static int qemu_rdma_source_init(RDMAContext *rdma, bool pin_all, Error **errp) |
2da776db MH |
2460 | { |
2461 | int ret, idx; | |
2462 | Error *local_err = NULL, **temp = &local_err; | |
2463 | ||
2464 | /* | |
2465 | * Will be validated against destination's actual capabilities | |
2466 | * after the connect() completes. | |
2467 | */ | |
2468 | rdma->pin_all = pin_all; | |
2469 | ||
2470 | ret = qemu_rdma_resolve_host(rdma, temp); | |
2471 | if (ret) { | |
2472 | goto err_rdma_source_init; | |
2473 | } | |
2474 | ||
2475 | ret = qemu_rdma_alloc_pd_cq(rdma); | |
2476 | if (ret) { | |
2477 | ERROR(temp, "rdma migration: error allocating pd and cq! Your mlock()" | |
2478 | " limits may be too low. Please check $ ulimit -a # and " | |
66988941 | 2479 | "search for 'ulimit -l' in the output"); |
2da776db MH |
2480 | goto err_rdma_source_init; |
2481 | } | |
2482 | ||
2483 | ret = qemu_rdma_alloc_qp(rdma); | |
2484 | if (ret) { | |
66988941 | 2485 | ERROR(temp, "rdma migration: error allocating qp!"); |
2da776db MH |
2486 | goto err_rdma_source_init; |
2487 | } | |
2488 | ||
2489 | ret = qemu_rdma_init_ram_blocks(rdma); | |
2490 | if (ret) { | |
66988941 | 2491 | ERROR(temp, "rdma migration: error initializing ram blocks!"); |
2da776db MH |
2492 | goto err_rdma_source_init; |
2493 | } | |
2494 | ||
760ff4be DDAG |
2495 | /* Build the hash that maps from offset to RAMBlock */ |
2496 | rdma->blockmap = g_hash_table_new(g_direct_hash, g_direct_equal); | |
2497 | for (idx = 0; idx < rdma->local_ram_blocks.nb_blocks; idx++) { | |
2498 | g_hash_table_insert(rdma->blockmap, | |
2499 | (void *)(uintptr_t)rdma->local_ram_blocks.block[idx].offset, | |
2500 | &rdma->local_ram_blocks.block[idx]); | |
2501 | } | |
2502 | ||
1f22364b | 2503 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
2504 | ret = qemu_rdma_reg_control(rdma, idx); |
2505 | if (ret) { | |
66988941 | 2506 | ERROR(temp, "rdma migration: error registering %d control!", |
2da776db MH |
2507 | idx); |
2508 | goto err_rdma_source_init; | |
2509 | } | |
2510 | } | |
2511 | ||
2512 | return 0; | |
2513 | ||
2514 | err_rdma_source_init: | |
2515 | error_propagate(errp, local_err); | |
2516 | qemu_rdma_cleanup(rdma); | |
2517 | return -1; | |
2518 | } | |
2519 | ||
e49e49dd LZ |
2520 | static int qemu_get_cm_event_timeout(RDMAContext *rdma, |
2521 | struct rdma_cm_event **cm_event, | |
2522 | long msec, Error **errp) | |
2523 | { | |
2524 | int ret; | |
2525 | struct pollfd poll_fd = { | |
2526 | .fd = rdma->channel->fd, | |
2527 | .events = POLLIN, | |
2528 | .revents = 0 | |
2529 | }; | |
2530 | ||
2531 | do { | |
2532 | ret = poll(&poll_fd, 1, msec); | |
2533 | } while (ret < 0 && errno == EINTR); | |
2534 | ||
2535 | if (ret == 0) { | |
2536 | ERROR(errp, "poll cm event timeout"); | |
2537 | return -1; | |
2538 | } else if (ret < 0) { | |
2539 | ERROR(errp, "failed to poll cm event, errno=%i", errno); | |
2540 | return -1; | |
2541 | } else if (poll_fd.revents & POLLIN) { | |
2542 | return rdma_get_cm_event(rdma->channel, cm_event); | |
2543 | } else { | |
2544 | ERROR(errp, "no POLLIN event, revent=%x", poll_fd.revents); | |
2545 | return -1; | |
2546 | } | |
2547 | } | |
2548 | ||
2549 | static int qemu_rdma_connect(RDMAContext *rdma, Error **errp, bool return_path) | |
2da776db MH |
2550 | { |
2551 | RDMACapabilities cap = { | |
2552 | .version = RDMA_CONTROL_VERSION_CURRENT, | |
2553 | .flags = 0, | |
2554 | }; | |
2555 | struct rdma_conn_param conn_param = { .initiator_depth = 2, | |
2556 | .retry_count = 5, | |
2557 | .private_data = &cap, | |
2558 | .private_data_len = sizeof(cap), | |
2559 | }; | |
2560 | struct rdma_cm_event *cm_event; | |
2561 | int ret; | |
2562 | ||
2563 | /* | |
2564 | * Only negotiate the capability with destination if the user | |
2565 | * on the source first requested the capability. | |
2566 | */ | |
2567 | if (rdma->pin_all) { | |
733252de | 2568 | trace_qemu_rdma_connect_pin_all_requested(); |
2da776db MH |
2569 | cap.flags |= RDMA_CAPABILITY_PIN_ALL; |
2570 | } | |
2571 | ||
2572 | caps_to_network(&cap); | |
2573 | ||
9cf2bab2 DDAG |
2574 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); |
2575 | if (ret) { | |
2576 | ERROR(errp, "posting second control recv"); | |
2577 | goto err_rdma_source_connect; | |
2578 | } | |
2579 | ||
2da776db MH |
2580 | ret = rdma_connect(rdma->cm_id, &conn_param); |
2581 | if (ret) { | |
2582 | perror("rdma_connect"); | |
66988941 | 2583 | ERROR(errp, "connecting to destination!"); |
2da776db MH |
2584 | goto err_rdma_source_connect; |
2585 | } | |
2586 | ||
e49e49dd LZ |
2587 | if (return_path) { |
2588 | ret = qemu_get_cm_event_timeout(rdma, &cm_event, 5000, errp); | |
2589 | } else { | |
2590 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
2591 | } | |
2da776db MH |
2592 | if (ret) { |
2593 | perror("rdma_get_cm_event after rdma_connect"); | |
66988941 | 2594 | ERROR(errp, "connecting to destination!"); |
2da776db MH |
2595 | goto err_rdma_source_connect; |
2596 | } | |
2597 | ||
2598 | if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) { | |
e5f60791 | 2599 | error_report("rdma_get_cm_event != EVENT_ESTABLISHED after rdma_connect"); |
66988941 | 2600 | ERROR(errp, "connecting to destination!"); |
2da776db | 2601 | rdma_ack_cm_event(cm_event); |
2da776db MH |
2602 | goto err_rdma_source_connect; |
2603 | } | |
5a91337c | 2604 | rdma->connected = true; |
2da776db MH |
2605 | |
2606 | memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap)); | |
2607 | network_to_caps(&cap); | |
2608 | ||
2609 | /* | |
2610 | * Verify that the *requested* capabilities are supported by the destination | |
2611 | * and disable them otherwise. | |
2612 | */ | |
2613 | if (rdma->pin_all && !(cap.flags & RDMA_CAPABILITY_PIN_ALL)) { | |
2614 | ERROR(errp, "Server cannot support pinning all memory. " | |
66988941 | 2615 | "Will register memory dynamically."); |
2da776db MH |
2616 | rdma->pin_all = false; |
2617 | } | |
2618 | ||
733252de | 2619 | trace_qemu_rdma_connect_pin_all_outcome(rdma->pin_all); |
2da776db MH |
2620 | |
2621 | rdma_ack_cm_event(cm_event); | |
2622 | ||
2da776db MH |
2623 | rdma->control_ready_expected = 1; |
2624 | rdma->nb_sent = 0; | |
2625 | return 0; | |
2626 | ||
2627 | err_rdma_source_connect: | |
2628 | qemu_rdma_cleanup(rdma); | |
2629 | return -1; | |
2630 | } | |
2631 | ||
2632 | static int qemu_rdma_dest_init(RDMAContext *rdma, Error **errp) | |
2633 | { | |
1dbd2fd9 | 2634 | int ret, idx; |
2da776db MH |
2635 | struct rdma_cm_id *listen_id; |
2636 | char ip[40] = "unknown"; | |
1dbd2fd9 | 2637 | struct rdma_addrinfo *res, *e; |
b58c8552 | 2638 | char port_str[16]; |
f736e414 | 2639 | int reuse = 1; |
2da776db | 2640 | |
1f22364b | 2641 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
2642 | rdma->wr_data[idx].control_len = 0; |
2643 | rdma->wr_data[idx].control_curr = NULL; | |
2644 | } | |
2645 | ||
1dbd2fd9 | 2646 | if (!rdma->host || !rdma->host[0]) { |
66988941 | 2647 | ERROR(errp, "RDMA host is not set!"); |
2da776db MH |
2648 | rdma->error_state = -EINVAL; |
2649 | return -1; | |
2650 | } | |
2651 | /* create CM channel */ | |
2652 | rdma->channel = rdma_create_event_channel(); | |
2653 | if (!rdma->channel) { | |
66988941 | 2654 | ERROR(errp, "could not create rdma event channel"); |
2da776db MH |
2655 | rdma->error_state = -EINVAL; |
2656 | return -1; | |
2657 | } | |
2658 | ||
2659 | /* create CM id */ | |
2660 | ret = rdma_create_id(rdma->channel, &listen_id, NULL, RDMA_PS_TCP); | |
2661 | if (ret) { | |
66988941 | 2662 | ERROR(errp, "could not create cm_id!"); |
2da776db MH |
2663 | goto err_dest_init_create_listen_id; |
2664 | } | |
2665 | ||
b58c8552 MH |
2666 | snprintf(port_str, 16, "%d", rdma->port); |
2667 | port_str[15] = '\0'; | |
2da776db | 2668 | |
1dbd2fd9 MT |
2669 | ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res); |
2670 | if (ret < 0) { | |
2671 | ERROR(errp, "could not rdma_getaddrinfo address %s", rdma->host); | |
2672 | goto err_dest_init_bind_addr; | |
2673 | } | |
6470215b | 2674 | |
f736e414 JW |
2675 | ret = rdma_set_option(listen_id, RDMA_OPTION_ID, RDMA_OPTION_ID_REUSEADDR, |
2676 | &reuse, sizeof reuse); | |
2677 | if (ret) { | |
2678 | ERROR(errp, "Error: could not set REUSEADDR option"); | |
2679 | goto err_dest_init_bind_addr; | |
2680 | } | |
1dbd2fd9 MT |
2681 | for (e = res; e != NULL; e = e->ai_next) { |
2682 | inet_ntop(e->ai_family, | |
2683 | &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip); | |
2684 | trace_qemu_rdma_dest_init_trying(rdma->host, ip); | |
2685 | ret = rdma_bind_addr(listen_id, e->ai_dst_addr); | |
2686 | if (ret) { | |
2687 | continue; | |
2da776db | 2688 | } |
1dbd2fd9 | 2689 | if (e->ai_family == AF_INET6) { |
bbfb89e3 | 2690 | ret = qemu_rdma_broken_ipv6_kernel(listen_id->verbs, errp); |
1dbd2fd9 MT |
2691 | if (ret) { |
2692 | continue; | |
6470215b MH |
2693 | } |
2694 | } | |
1dbd2fd9 MT |
2695 | break; |
2696 | } | |
b58c8552 | 2697 | |
f53b450a | 2698 | rdma_freeaddrinfo(res); |
1dbd2fd9 | 2699 | if (!e) { |
6470215b MH |
2700 | ERROR(errp, "Error: could not rdma_bind_addr!"); |
2701 | goto err_dest_init_bind_addr; | |
2da776db | 2702 | } |
2da776db MH |
2703 | |
2704 | rdma->listen_id = listen_id; | |
2705 | qemu_rdma_dump_gid("dest_init", listen_id); | |
2706 | return 0; | |
2707 | ||
2708 | err_dest_init_bind_addr: | |
2709 | rdma_destroy_id(listen_id); | |
2710 | err_dest_init_create_listen_id: | |
2711 | rdma_destroy_event_channel(rdma->channel); | |
2712 | rdma->channel = NULL; | |
2713 | rdma->error_state = ret; | |
2714 | return ret; | |
2715 | ||
2716 | } | |
2717 | ||
55cc1b59 LC |
2718 | static void qemu_rdma_return_path_dest_init(RDMAContext *rdma_return_path, |
2719 | RDMAContext *rdma) | |
2720 | { | |
2721 | int idx; | |
2722 | ||
2723 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { | |
2724 | rdma_return_path->wr_data[idx].control_len = 0; | |
2725 | rdma_return_path->wr_data[idx].control_curr = NULL; | |
2726 | } | |
2727 | ||
2728 | /*the CM channel and CM id is shared*/ | |
2729 | rdma_return_path->channel = rdma->channel; | |
2730 | rdma_return_path->listen_id = rdma->listen_id; | |
2731 | ||
2732 | rdma->return_path = rdma_return_path; | |
2733 | rdma_return_path->return_path = rdma; | |
2734 | rdma_return_path->is_return_path = true; | |
2735 | } | |
2736 | ||
2da776db MH |
2737 | static void *qemu_rdma_data_init(const char *host_port, Error **errp) |
2738 | { | |
2739 | RDMAContext *rdma = NULL; | |
2740 | InetSocketAddress *addr; | |
2741 | ||
2742 | if (host_port) { | |
97f3ad35 | 2743 | rdma = g_new0(RDMAContext, 1); |
2da776db MH |
2744 | rdma->current_index = -1; |
2745 | rdma->current_chunk = -1; | |
2746 | ||
0785bd7a MA |
2747 | addr = g_new(InetSocketAddress, 1); |
2748 | if (!inet_parse(addr, host_port, NULL)) { | |
2da776db MH |
2749 | rdma->port = atoi(addr->port); |
2750 | rdma->host = g_strdup(addr->host); | |
44bcfd45 | 2751 | rdma->host_port = g_strdup(host_port); |
2da776db MH |
2752 | } else { |
2753 | ERROR(errp, "bad RDMA migration address '%s'", host_port); | |
2754 | g_free(rdma); | |
e325b49a | 2755 | rdma = NULL; |
2da776db | 2756 | } |
e325b49a MH |
2757 | |
2758 | qapi_free_InetSocketAddress(addr); | |
2da776db MH |
2759 | } |
2760 | ||
2761 | return rdma; | |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * QEMUFile interface to the control channel. | |
2766 | * SEND messages for control only. | |
971ae6ef | 2767 | * VM's ram is handled with regular RDMA messages. |
2da776db | 2768 | */ |
6ddd2d76 DB |
2769 | static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, |
2770 | const struct iovec *iov, | |
2771 | size_t niov, | |
2772 | int *fds, | |
2773 | size_t nfds, | |
b88651cb | 2774 | int flags, |
6ddd2d76 DB |
2775 | Error **errp) |
2776 | { | |
2777 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
2778 | QEMUFile *f = rioc->file; | |
74637e6f | 2779 | RDMAContext *rdma; |
2da776db | 2780 | int ret; |
6ddd2d76 DB |
2781 | ssize_t done = 0; |
2782 | size_t i; | |
f38f6d41 | 2783 | size_t len = 0; |
2da776db | 2784 | |
987ab2a5 | 2785 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 2786 | rdma = qatomic_rcu_read(&rioc->rdmaout); |
74637e6f LC |
2787 | |
2788 | if (!rdma) { | |
74637e6f LC |
2789 | return -EIO; |
2790 | } | |
2791 | ||
2da776db MH |
2792 | CHECK_ERROR_STATE(); |
2793 | ||
2794 | /* | |
2795 | * Push out any writes that | |
971ae6ef | 2796 | * we're queued up for VM's ram. |
2da776db MH |
2797 | */ |
2798 | ret = qemu_rdma_write_flush(f, rdma); | |
2799 | if (ret < 0) { | |
2800 | rdma->error_state = ret; | |
2801 | return ret; | |
2802 | } | |
2803 | ||
6ddd2d76 DB |
2804 | for (i = 0; i < niov; i++) { |
2805 | size_t remaining = iov[i].iov_len; | |
2806 | uint8_t * data = (void *)iov[i].iov_base; | |
2807 | while (remaining) { | |
2808 | RDMAControlHeader head; | |
2da776db | 2809 | |
f38f6d41 LC |
2810 | len = MIN(remaining, RDMA_SEND_INCREMENT); |
2811 | remaining -= len; | |
2da776db | 2812 | |
f38f6d41 | 2813 | head.len = len; |
6ddd2d76 | 2814 | head.type = RDMA_CONTROL_QEMU_FILE; |
2da776db | 2815 | |
6ddd2d76 | 2816 | ret = qemu_rdma_exchange_send(rdma, &head, data, NULL, NULL, NULL); |
2da776db | 2817 | |
6ddd2d76 DB |
2818 | if (ret < 0) { |
2819 | rdma->error_state = ret; | |
2820 | return ret; | |
2821 | } | |
2da776db | 2822 | |
f38f6d41 LC |
2823 | data += len; |
2824 | done += len; | |
6ddd2d76 | 2825 | } |
2da776db MH |
2826 | } |
2827 | ||
6ddd2d76 | 2828 | return done; |
2da776db MH |
2829 | } |
2830 | ||
2831 | static size_t qemu_rdma_fill(RDMAContext *rdma, uint8_t *buf, | |
a202a4c0 | 2832 | size_t size, int idx) |
2da776db MH |
2833 | { |
2834 | size_t len = 0; | |
2835 | ||
2836 | if (rdma->wr_data[idx].control_len) { | |
733252de | 2837 | trace_qemu_rdma_fill(rdma->wr_data[idx].control_len, size); |
2da776db MH |
2838 | |
2839 | len = MIN(size, rdma->wr_data[idx].control_len); | |
2840 | memcpy(buf, rdma->wr_data[idx].control_curr, len); | |
2841 | rdma->wr_data[idx].control_curr += len; | |
2842 | rdma->wr_data[idx].control_len -= len; | |
2843 | } | |
2844 | ||
2845 | return len; | |
2846 | } | |
2847 | ||
2848 | /* | |
2849 | * QEMUFile interface to the control channel. | |
2850 | * RDMA links don't use bytestreams, so we have to | |
2851 | * return bytes to QEMUFile opportunistically. | |
2852 | */ | |
6ddd2d76 DB |
2853 | static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, |
2854 | const struct iovec *iov, | |
2855 | size_t niov, | |
2856 | int **fds, | |
2857 | size_t *nfds, | |
2858 | Error **errp) | |
2859 | { | |
2860 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
74637e6f | 2861 | RDMAContext *rdma; |
2da776db MH |
2862 | RDMAControlHeader head; |
2863 | int ret = 0; | |
6ddd2d76 DB |
2864 | ssize_t i; |
2865 | size_t done = 0; | |
2da776db | 2866 | |
987ab2a5 | 2867 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 2868 | rdma = qatomic_rcu_read(&rioc->rdmain); |
74637e6f LC |
2869 | |
2870 | if (!rdma) { | |
74637e6f LC |
2871 | return -EIO; |
2872 | } | |
2873 | ||
2da776db MH |
2874 | CHECK_ERROR_STATE(); |
2875 | ||
6ddd2d76 DB |
2876 | for (i = 0; i < niov; i++) { |
2877 | size_t want = iov[i].iov_len; | |
2878 | uint8_t *data = (void *)iov[i].iov_base; | |
2da776db | 2879 | |
6ddd2d76 DB |
2880 | /* |
2881 | * First, we hold on to the last SEND message we | |
2882 | * were given and dish out the bytes until we run | |
2883 | * out of bytes. | |
2884 | */ | |
74637e6f | 2885 | ret = qemu_rdma_fill(rdma, data, want, 0); |
6ddd2d76 DB |
2886 | done += ret; |
2887 | want -= ret; | |
2888 | /* Got what we needed, so go to next iovec */ | |
2889 | if (want == 0) { | |
2890 | continue; | |
2891 | } | |
2da776db | 2892 | |
6ddd2d76 DB |
2893 | /* If we got any data so far, then don't wait |
2894 | * for more, just return what we have */ | |
2895 | if (done > 0) { | |
2896 | break; | |
2897 | } | |
2da776db | 2898 | |
6ddd2d76 DB |
2899 | |
2900 | /* We've got nothing at all, so lets wait for | |
2901 | * more to arrive | |
2902 | */ | |
2903 | ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_QEMU_FILE); | |
2904 | ||
2905 | if (ret < 0) { | |
2906 | rdma->error_state = ret; | |
2907 | return ret; | |
2908 | } | |
2909 | ||
2910 | /* | |
2911 | * SEND was received with new bytes, now try again. | |
2912 | */ | |
74637e6f | 2913 | ret = qemu_rdma_fill(rdma, data, want, 0); |
6ddd2d76 DB |
2914 | done += ret; |
2915 | want -= ret; | |
2916 | ||
2917 | /* Still didn't get enough, so lets just return */ | |
2918 | if (want) { | |
2919 | if (done == 0) { | |
2920 | return QIO_CHANNEL_ERR_BLOCK; | |
2921 | } else { | |
2922 | break; | |
2923 | } | |
2924 | } | |
2925 | } | |
f38f6d41 | 2926 | return done; |
2da776db MH |
2927 | } |
2928 | ||
2929 | /* | |
2930 | * Block until all the outstanding chunks have been delivered by the hardware. | |
2931 | */ | |
2932 | static int qemu_rdma_drain_cq(QEMUFile *f, RDMAContext *rdma) | |
2933 | { | |
2934 | int ret; | |
2935 | ||
2936 | if (qemu_rdma_write_flush(f, rdma) < 0) { | |
2937 | return -EIO; | |
2938 | } | |
2939 | ||
2940 | while (rdma->nb_sent) { | |
88571882 | 2941 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); |
2da776db | 2942 | if (ret < 0) { |
733252de | 2943 | error_report("rdma migration: complete polling error!"); |
2da776db MH |
2944 | return -EIO; |
2945 | } | |
2946 | } | |
2947 | ||
2948 | qemu_rdma_unregister_waiting(rdma); | |
2949 | ||
2950 | return 0; | |
2951 | } | |
2952 | ||
6ddd2d76 DB |
2953 | |
2954 | static int qio_channel_rdma_set_blocking(QIOChannel *ioc, | |
2955 | bool blocking, | |
2956 | Error **errp) | |
2957 | { | |
2958 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
2959 | /* XXX we should make readv/writev actually honour this :-) */ | |
2960 | rioc->blocking = blocking; | |
2961 | return 0; | |
2962 | } | |
2963 | ||
2964 | ||
2965 | typedef struct QIOChannelRDMASource QIOChannelRDMASource; | |
2966 | struct QIOChannelRDMASource { | |
2967 | GSource parent; | |
2968 | QIOChannelRDMA *rioc; | |
2969 | GIOCondition condition; | |
2970 | }; | |
2971 | ||
2972 | static gboolean | |
2973 | qio_channel_rdma_source_prepare(GSource *source, | |
2974 | gint *timeout) | |
2975 | { | |
2976 | QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; | |
74637e6f | 2977 | RDMAContext *rdma; |
6ddd2d76 DB |
2978 | GIOCondition cond = 0; |
2979 | *timeout = -1; | |
2980 | ||
987ab2a5 | 2981 | RCU_READ_LOCK_GUARD(); |
74637e6f | 2982 | if (rsource->condition == G_IO_IN) { |
d73415a3 | 2983 | rdma = qatomic_rcu_read(&rsource->rioc->rdmain); |
74637e6f | 2984 | } else { |
d73415a3 | 2985 | rdma = qatomic_rcu_read(&rsource->rioc->rdmaout); |
74637e6f LC |
2986 | } |
2987 | ||
2988 | if (!rdma) { | |
2989 | error_report("RDMAContext is NULL when prepare Gsource"); | |
74637e6f LC |
2990 | return FALSE; |
2991 | } | |
2992 | ||
6ddd2d76 DB |
2993 | if (rdma->wr_data[0].control_len) { |
2994 | cond |= G_IO_IN; | |
2995 | } | |
2996 | cond |= G_IO_OUT; | |
2997 | ||
2998 | return cond & rsource->condition; | |
2999 | } | |
3000 | ||
3001 | static gboolean | |
3002 | qio_channel_rdma_source_check(GSource *source) | |
3003 | { | |
3004 | QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; | |
74637e6f | 3005 | RDMAContext *rdma; |
6ddd2d76 DB |
3006 | GIOCondition cond = 0; |
3007 | ||
987ab2a5 | 3008 | RCU_READ_LOCK_GUARD(); |
74637e6f | 3009 | if (rsource->condition == G_IO_IN) { |
d73415a3 | 3010 | rdma = qatomic_rcu_read(&rsource->rioc->rdmain); |
74637e6f | 3011 | } else { |
d73415a3 | 3012 | rdma = qatomic_rcu_read(&rsource->rioc->rdmaout); |
74637e6f LC |
3013 | } |
3014 | ||
3015 | if (!rdma) { | |
3016 | error_report("RDMAContext is NULL when check Gsource"); | |
74637e6f LC |
3017 | return FALSE; |
3018 | } | |
3019 | ||
6ddd2d76 DB |
3020 | if (rdma->wr_data[0].control_len) { |
3021 | cond |= G_IO_IN; | |
3022 | } | |
3023 | cond |= G_IO_OUT; | |
3024 | ||
3025 | return cond & rsource->condition; | |
3026 | } | |
3027 | ||
3028 | static gboolean | |
3029 | qio_channel_rdma_source_dispatch(GSource *source, | |
3030 | GSourceFunc callback, | |
3031 | gpointer user_data) | |
3032 | { | |
3033 | QIOChannelFunc func = (QIOChannelFunc)callback; | |
3034 | QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; | |
74637e6f | 3035 | RDMAContext *rdma; |
6ddd2d76 DB |
3036 | GIOCondition cond = 0; |
3037 | ||
987ab2a5 | 3038 | RCU_READ_LOCK_GUARD(); |
74637e6f | 3039 | if (rsource->condition == G_IO_IN) { |
d73415a3 | 3040 | rdma = qatomic_rcu_read(&rsource->rioc->rdmain); |
74637e6f | 3041 | } else { |
d73415a3 | 3042 | rdma = qatomic_rcu_read(&rsource->rioc->rdmaout); |
74637e6f LC |
3043 | } |
3044 | ||
3045 | if (!rdma) { | |
3046 | error_report("RDMAContext is NULL when dispatch Gsource"); | |
74637e6f LC |
3047 | return FALSE; |
3048 | } | |
3049 | ||
6ddd2d76 DB |
3050 | if (rdma->wr_data[0].control_len) { |
3051 | cond |= G_IO_IN; | |
3052 | } | |
3053 | cond |= G_IO_OUT; | |
3054 | ||
3055 | return (*func)(QIO_CHANNEL(rsource->rioc), | |
3056 | (cond & rsource->condition), | |
3057 | user_data); | |
3058 | } | |
3059 | ||
3060 | static void | |
3061 | qio_channel_rdma_source_finalize(GSource *source) | |
3062 | { | |
3063 | QIOChannelRDMASource *ssource = (QIOChannelRDMASource *)source; | |
3064 | ||
3065 | object_unref(OBJECT(ssource->rioc)); | |
3066 | } | |
3067 | ||
3068 | GSourceFuncs qio_channel_rdma_source_funcs = { | |
3069 | qio_channel_rdma_source_prepare, | |
3070 | qio_channel_rdma_source_check, | |
3071 | qio_channel_rdma_source_dispatch, | |
3072 | qio_channel_rdma_source_finalize | |
3073 | }; | |
3074 | ||
3075 | static GSource *qio_channel_rdma_create_watch(QIOChannel *ioc, | |
3076 | GIOCondition condition) | |
2da776db | 3077 | { |
6ddd2d76 DB |
3078 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); |
3079 | QIOChannelRDMASource *ssource; | |
3080 | GSource *source; | |
3081 | ||
3082 | source = g_source_new(&qio_channel_rdma_source_funcs, | |
3083 | sizeof(QIOChannelRDMASource)); | |
3084 | ssource = (QIOChannelRDMASource *)source; | |
3085 | ||
3086 | ssource->rioc = rioc; | |
3087 | object_ref(OBJECT(rioc)); | |
3088 | ||
3089 | ssource->condition = condition; | |
3090 | ||
3091 | return source; | |
3092 | } | |
3093 | ||
4d9f675b LC |
3094 | static void qio_channel_rdma_set_aio_fd_handler(QIOChannel *ioc, |
3095 | AioContext *ctx, | |
3096 | IOHandler *io_read, | |
3097 | IOHandler *io_write, | |
3098 | void *opaque) | |
3099 | { | |
3100 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
3101 | if (io_read) { | |
b390afd8 | 3102 | aio_set_fd_handler(ctx, rioc->rdmain->recv_comp_channel->fd, |
826cc324 | 3103 | false, io_read, io_write, NULL, NULL, opaque); |
b390afd8 | 3104 | aio_set_fd_handler(ctx, rioc->rdmain->send_comp_channel->fd, |
826cc324 | 3105 | false, io_read, io_write, NULL, NULL, opaque); |
4d9f675b | 3106 | } else { |
b390afd8 | 3107 | aio_set_fd_handler(ctx, rioc->rdmaout->recv_comp_channel->fd, |
826cc324 | 3108 | false, io_read, io_write, NULL, NULL, opaque); |
b390afd8 | 3109 | aio_set_fd_handler(ctx, rioc->rdmaout->send_comp_channel->fd, |
826cc324 | 3110 | false, io_read, io_write, NULL, NULL, opaque); |
4d9f675b LC |
3111 | } |
3112 | } | |
6ddd2d76 | 3113 | |
d46a4847 DDAG |
3114 | struct rdma_close_rcu { |
3115 | struct rcu_head rcu; | |
3116 | RDMAContext *rdmain; | |
3117 | RDMAContext *rdmaout; | |
3118 | }; | |
3119 | ||
3120 | /* callback from qio_channel_rdma_close via call_rcu */ | |
3121 | static void qio_channel_rdma_close_rcu(struct rdma_close_rcu *rcu) | |
3122 | { | |
3123 | if (rcu->rdmain) { | |
3124 | qemu_rdma_cleanup(rcu->rdmain); | |
3125 | } | |
3126 | ||
3127 | if (rcu->rdmaout) { | |
3128 | qemu_rdma_cleanup(rcu->rdmaout); | |
3129 | } | |
3130 | ||
3131 | g_free(rcu->rdmain); | |
3132 | g_free(rcu->rdmaout); | |
3133 | g_free(rcu); | |
3134 | } | |
3135 | ||
6ddd2d76 DB |
3136 | static int qio_channel_rdma_close(QIOChannel *ioc, |
3137 | Error **errp) | |
3138 | { | |
3139 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
74637e6f | 3140 | RDMAContext *rdmain, *rdmaout; |
d46a4847 DDAG |
3141 | struct rdma_close_rcu *rcu = g_new(struct rdma_close_rcu, 1); |
3142 | ||
733252de | 3143 | trace_qemu_rdma_close(); |
74637e6f LC |
3144 | |
3145 | rdmain = rioc->rdmain; | |
3146 | if (rdmain) { | |
d73415a3 | 3147 | qatomic_rcu_set(&rioc->rdmain, NULL); |
74637e6f LC |
3148 | } |
3149 | ||
3150 | rdmaout = rioc->rdmaout; | |
3151 | if (rdmaout) { | |
d73415a3 | 3152 | qatomic_rcu_set(&rioc->rdmaout, NULL); |
2da776db | 3153 | } |
74637e6f | 3154 | |
d46a4847 DDAG |
3155 | rcu->rdmain = rdmain; |
3156 | rcu->rdmaout = rdmaout; | |
3157 | call_rcu(rcu, qio_channel_rdma_close_rcu, rcu); | |
74637e6f | 3158 | |
2da776db MH |
3159 | return 0; |
3160 | } | |
3161 | ||
54db882f LC |
3162 | static int |
3163 | qio_channel_rdma_shutdown(QIOChannel *ioc, | |
3164 | QIOChannelShutdown how, | |
3165 | Error **errp) | |
3166 | { | |
3167 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
3168 | RDMAContext *rdmain, *rdmaout; | |
3169 | ||
987ab2a5 | 3170 | RCU_READ_LOCK_GUARD(); |
54db882f | 3171 | |
d73415a3 SH |
3172 | rdmain = qatomic_rcu_read(&rioc->rdmain); |
3173 | rdmaout = qatomic_rcu_read(&rioc->rdmain); | |
54db882f LC |
3174 | |
3175 | switch (how) { | |
3176 | case QIO_CHANNEL_SHUTDOWN_READ: | |
3177 | if (rdmain) { | |
3178 | rdmain->error_state = -1; | |
3179 | } | |
3180 | break; | |
3181 | case QIO_CHANNEL_SHUTDOWN_WRITE: | |
3182 | if (rdmaout) { | |
3183 | rdmaout->error_state = -1; | |
3184 | } | |
3185 | break; | |
3186 | case QIO_CHANNEL_SHUTDOWN_BOTH: | |
3187 | default: | |
3188 | if (rdmain) { | |
3189 | rdmain->error_state = -1; | |
3190 | } | |
3191 | if (rdmaout) { | |
3192 | rdmaout->error_state = -1; | |
3193 | } | |
3194 | break; | |
3195 | } | |
3196 | ||
54db882f LC |
3197 | return 0; |
3198 | } | |
3199 | ||
2da776db MH |
3200 | /* |
3201 | * Parameters: | |
3202 | * @offset == 0 : | |
3203 | * This means that 'block_offset' is a full virtual address that does not | |
3204 | * belong to a RAMBlock of the virtual machine and instead | |
3205 | * represents a private malloc'd memory area that the caller wishes to | |
3206 | * transfer. | |
3207 | * | |
3208 | * @offset != 0 : | |
3209 | * Offset is an offset to be added to block_offset and used | |
3210 | * to also lookup the corresponding RAMBlock. | |
3211 | * | |
246683c2 | 3212 | * @size : Number of bytes to transfer |
2da776db MH |
3213 | * |
3214 | * @bytes_sent : User-specificed pointer to indicate how many bytes were | |
3215 | * sent. Usually, this will not be more than a few bytes of | |
3216 | * the protocol because most transfers are sent asynchronously. | |
3217 | */ | |
365c0463 | 3218 | static size_t qemu_rdma_save_page(QEMUFile *f, |
2da776db | 3219 | ram_addr_t block_offset, ram_addr_t offset, |
6e1dea46 | 3220 | size_t size, uint64_t *bytes_sent) |
2da776db | 3221 | { |
365c0463 | 3222 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); |
74637e6f | 3223 | RDMAContext *rdma; |
2da776db MH |
3224 | int ret; |
3225 | ||
987ab2a5 | 3226 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 3227 | rdma = qatomic_rcu_read(&rioc->rdmaout); |
74637e6f LC |
3228 | |
3229 | if (!rdma) { | |
74637e6f LC |
3230 | return -EIO; |
3231 | } | |
3232 | ||
2da776db MH |
3233 | CHECK_ERROR_STATE(); |
3234 | ||
6a88eb2b | 3235 | if (migration_in_postcopy()) { |
ccb7e1b5 LC |
3236 | return RAM_SAVE_CONTROL_NOT_SUPP; |
3237 | } | |
3238 | ||
2da776db MH |
3239 | qemu_fflush(f); |
3240 | ||
246683c2 DB |
3241 | /* |
3242 | * Add this page to the current 'chunk'. If the chunk | |
3243 | * is full, or the page doesn't belong to the current chunk, | |
3244 | * an actual RDMA write will occur and a new chunk will be formed. | |
3245 | */ | |
3246 | ret = qemu_rdma_write(f, rdma, block_offset, offset, size); | |
3247 | if (ret < 0) { | |
3248 | error_report("rdma migration: write error! %d", ret); | |
3249 | goto err; | |
3250 | } | |
2da776db | 3251 | |
246683c2 DB |
3252 | /* |
3253 | * We always return 1 bytes because the RDMA | |
3254 | * protocol is completely asynchronous. We do not yet know | |
3255 | * whether an identified chunk is zero or not because we're | |
3256 | * waiting for other pages to potentially be merged with | |
3257 | * the current chunk. So, we have to call qemu_update_position() | |
3258 | * later on when the actual write occurs. | |
3259 | */ | |
3260 | if (bytes_sent) { | |
3261 | *bytes_sent = 1; | |
2da776db MH |
3262 | } |
3263 | ||
3264 | /* | |
3265 | * Drain the Completion Queue if possible, but do not block, | |
3266 | * just poll. | |
3267 | * | |
3268 | * If nothing to poll, the end of the iteration will do this | |
3269 | * again to make sure we don't overflow the request queue. | |
3270 | */ | |
3271 | while (1) { | |
3272 | uint64_t wr_id, wr_id_in; | |
b390afd8 LZ |
3273 | int ret = qemu_rdma_poll(rdma, rdma->recv_cq, &wr_id_in, NULL); |
3274 | if (ret < 0) { | |
3275 | error_report("rdma migration: polling error! %d", ret); | |
3276 | goto err; | |
3277 | } | |
3278 | ||
3279 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
3280 | ||
3281 | if (wr_id == RDMA_WRID_NONE) { | |
3282 | break; | |
3283 | } | |
3284 | } | |
3285 | ||
3286 | while (1) { | |
3287 | uint64_t wr_id, wr_id_in; | |
3288 | int ret = qemu_rdma_poll(rdma, rdma->send_cq, &wr_id_in, NULL); | |
2da776db | 3289 | if (ret < 0) { |
733252de | 3290 | error_report("rdma migration: polling error! %d", ret); |
2da776db MH |
3291 | goto err; |
3292 | } | |
3293 | ||
3294 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
3295 | ||
3296 | if (wr_id == RDMA_WRID_NONE) { | |
3297 | break; | |
3298 | } | |
3299 | } | |
3300 | ||
3301 | return RAM_SAVE_CONTROL_DELAYED; | |
3302 | err: | |
3303 | rdma->error_state = ret; | |
3304 | return ret; | |
3305 | } | |
3306 | ||
55cc1b59 LC |
3307 | static void rdma_accept_incoming_migration(void *opaque); |
3308 | ||
92370989 LC |
3309 | static void rdma_cm_poll_handler(void *opaque) |
3310 | { | |
3311 | RDMAContext *rdma = opaque; | |
3312 | int ret; | |
3313 | struct rdma_cm_event *cm_event; | |
3314 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
3315 | ||
3316 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
3317 | if (ret) { | |
3318 | error_report("get_cm_event failed %d", errno); | |
3319 | return; | |
3320 | } | |
92370989 LC |
3321 | |
3322 | if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED || | |
3323 | cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) { | |
de8434a3 DDAG |
3324 | if (!rdma->error_state && |
3325 | migration_incoming_get_current()->state != | |
3326 | MIGRATION_STATUS_COMPLETED) { | |
3327 | error_report("receive cm event, cm event is %d", cm_event->event); | |
3328 | rdma->error_state = -EPIPE; | |
3329 | if (rdma->return_path) { | |
3330 | rdma->return_path->error_state = -EPIPE; | |
3331 | } | |
92370989 | 3332 | } |
6b8c2eb5 | 3333 | rdma_ack_cm_event(cm_event); |
92370989 LC |
3334 | |
3335 | if (mis->migration_incoming_co) { | |
3336 | qemu_coroutine_enter(mis->migration_incoming_co); | |
3337 | } | |
3338 | return; | |
3339 | } | |
6b8c2eb5 | 3340 | rdma_ack_cm_event(cm_event); |
92370989 LC |
3341 | } |
3342 | ||
2da776db MH |
3343 | static int qemu_rdma_accept(RDMAContext *rdma) |
3344 | { | |
3345 | RDMACapabilities cap; | |
3346 | struct rdma_conn_param conn_param = { | |
3347 | .responder_resources = 2, | |
3348 | .private_data = &cap, | |
3349 | .private_data_len = sizeof(cap), | |
3350 | }; | |
44bcfd45 | 3351 | RDMAContext *rdma_return_path = NULL; |
2da776db MH |
3352 | struct rdma_cm_event *cm_event; |
3353 | struct ibv_context *verbs; | |
3354 | int ret = -EINVAL; | |
3355 | int idx; | |
3356 | ||
3357 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
3358 | if (ret) { | |
3359 | goto err_rdma_dest_wait; | |
3360 | } | |
3361 | ||
3362 | if (cm_event->event != RDMA_CM_EVENT_CONNECT_REQUEST) { | |
3363 | rdma_ack_cm_event(cm_event); | |
3364 | goto err_rdma_dest_wait; | |
3365 | } | |
3366 | ||
44bcfd45 LZ |
3367 | /* |
3368 | * initialize the RDMAContext for return path for postcopy after first | |
3369 | * connection request reached. | |
3370 | */ | |
3371 | if (migrate_postcopy() && !rdma->is_return_path) { | |
3372 | rdma_return_path = qemu_rdma_data_init(rdma->host_port, NULL); | |
3373 | if (rdma_return_path == NULL) { | |
3374 | rdma_ack_cm_event(cm_event); | |
3375 | goto err_rdma_dest_wait; | |
3376 | } | |
3377 | ||
3378 | qemu_rdma_return_path_dest_init(rdma_return_path, rdma); | |
3379 | } | |
3380 | ||
2da776db MH |
3381 | memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap)); |
3382 | ||
3383 | network_to_caps(&cap); | |
3384 | ||
3385 | if (cap.version < 1 || cap.version > RDMA_CONTROL_VERSION_CURRENT) { | |
733252de | 3386 | error_report("Unknown source RDMA version: %d, bailing...", |
2da776db MH |
3387 | cap.version); |
3388 | rdma_ack_cm_event(cm_event); | |
3389 | goto err_rdma_dest_wait; | |
3390 | } | |
3391 | ||
3392 | /* | |
3393 | * Respond with only the capabilities this version of QEMU knows about. | |
3394 | */ | |
3395 | cap.flags &= known_capabilities; | |
3396 | ||
3397 | /* | |
3398 | * Enable the ones that we do know about. | |
3399 | * Add other checks here as new ones are introduced. | |
3400 | */ | |
3401 | if (cap.flags & RDMA_CAPABILITY_PIN_ALL) { | |
3402 | rdma->pin_all = true; | |
3403 | } | |
3404 | ||
3405 | rdma->cm_id = cm_event->id; | |
3406 | verbs = cm_event->id->verbs; | |
3407 | ||
3408 | rdma_ack_cm_event(cm_event); | |
3409 | ||
733252de | 3410 | trace_qemu_rdma_accept_pin_state(rdma->pin_all); |
2da776db MH |
3411 | |
3412 | caps_to_network(&cap); | |
3413 | ||
733252de | 3414 | trace_qemu_rdma_accept_pin_verbsc(verbs); |
2da776db MH |
3415 | |
3416 | if (!rdma->verbs) { | |
3417 | rdma->verbs = verbs; | |
3418 | } else if (rdma->verbs != verbs) { | |
733252de DDAG |
3419 | error_report("ibv context not matching %p, %p!", rdma->verbs, |
3420 | verbs); | |
2da776db MH |
3421 | goto err_rdma_dest_wait; |
3422 | } | |
3423 | ||
3424 | qemu_rdma_dump_id("dest_init", verbs); | |
3425 | ||
3426 | ret = qemu_rdma_alloc_pd_cq(rdma); | |
3427 | if (ret) { | |
733252de | 3428 | error_report("rdma migration: error allocating pd and cq!"); |
2da776db MH |
3429 | goto err_rdma_dest_wait; |
3430 | } | |
3431 | ||
3432 | ret = qemu_rdma_alloc_qp(rdma); | |
3433 | if (ret) { | |
733252de | 3434 | error_report("rdma migration: error allocating qp!"); |
2da776db MH |
3435 | goto err_rdma_dest_wait; |
3436 | } | |
3437 | ||
3438 | ret = qemu_rdma_init_ram_blocks(rdma); | |
3439 | if (ret) { | |
733252de | 3440 | error_report("rdma migration: error initializing ram blocks!"); |
2da776db MH |
3441 | goto err_rdma_dest_wait; |
3442 | } | |
3443 | ||
1f22364b | 3444 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
3445 | ret = qemu_rdma_reg_control(rdma, idx); |
3446 | if (ret) { | |
733252de | 3447 | error_report("rdma: error registering %d control", idx); |
2da776db MH |
3448 | goto err_rdma_dest_wait; |
3449 | } | |
3450 | } | |
3451 | ||
55cc1b59 LC |
3452 | /* Accept the second connection request for return path */ |
3453 | if (migrate_postcopy() && !rdma->is_return_path) { | |
3454 | qemu_set_fd_handler(rdma->channel->fd, rdma_accept_incoming_migration, | |
3455 | NULL, | |
3456 | (void *)(intptr_t)rdma->return_path); | |
3457 | } else { | |
92370989 LC |
3458 | qemu_set_fd_handler(rdma->channel->fd, rdma_cm_poll_handler, |
3459 | NULL, rdma); | |
55cc1b59 | 3460 | } |
2da776db MH |
3461 | |
3462 | ret = rdma_accept(rdma->cm_id, &conn_param); | |
3463 | if (ret) { | |
733252de | 3464 | error_report("rdma_accept returns %d", ret); |
2da776db MH |
3465 | goto err_rdma_dest_wait; |
3466 | } | |
3467 | ||
3468 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
3469 | if (ret) { | |
733252de | 3470 | error_report("rdma_accept get_cm_event failed %d", ret); |
2da776db MH |
3471 | goto err_rdma_dest_wait; |
3472 | } | |
3473 | ||
3474 | if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) { | |
733252de | 3475 | error_report("rdma_accept not event established"); |
2da776db MH |
3476 | rdma_ack_cm_event(cm_event); |
3477 | goto err_rdma_dest_wait; | |
3478 | } | |
3479 | ||
3480 | rdma_ack_cm_event(cm_event); | |
5a91337c | 3481 | rdma->connected = true; |
2da776db | 3482 | |
87772639 | 3483 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); |
2da776db | 3484 | if (ret) { |
733252de | 3485 | error_report("rdma migration: error posting second control recv"); |
2da776db MH |
3486 | goto err_rdma_dest_wait; |
3487 | } | |
3488 | ||
3489 | qemu_rdma_dump_gid("dest_connect", rdma->cm_id); | |
3490 | ||
3491 | return 0; | |
3492 | ||
3493 | err_rdma_dest_wait: | |
3494 | rdma->error_state = ret; | |
3495 | qemu_rdma_cleanup(rdma); | |
44bcfd45 | 3496 | g_free(rdma_return_path); |
2da776db MH |
3497 | return ret; |
3498 | } | |
3499 | ||
e4d63320 DDAG |
3500 | static int dest_ram_sort_func(const void *a, const void *b) |
3501 | { | |
3502 | unsigned int a_index = ((const RDMALocalBlock *)a)->src_index; | |
3503 | unsigned int b_index = ((const RDMALocalBlock *)b)->src_index; | |
3504 | ||
3505 | return (a_index < b_index) ? -1 : (a_index != b_index); | |
3506 | } | |
3507 | ||
2da776db MH |
3508 | /* |
3509 | * During each iteration of the migration, we listen for instructions | |
3510 | * by the source VM to perform dynamic page registrations before they | |
3511 | * can perform RDMA operations. | |
3512 | * | |
3513 | * We respond with the 'rkey'. | |
3514 | * | |
3515 | * Keep doing this until the source tells us to stop. | |
3516 | */ | |
632e3a5c | 3517 | static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque) |
2da776db MH |
3518 | { |
3519 | RDMAControlHeader reg_resp = { .len = sizeof(RDMARegisterResult), | |
3520 | .type = RDMA_CONTROL_REGISTER_RESULT, | |
3521 | .repeat = 0, | |
3522 | }; | |
3523 | RDMAControlHeader unreg_resp = { .len = 0, | |
3524 | .type = RDMA_CONTROL_UNREGISTER_FINISHED, | |
3525 | .repeat = 0, | |
3526 | }; | |
3527 | RDMAControlHeader blocks = { .type = RDMA_CONTROL_RAM_BLOCKS_RESULT, | |
3528 | .repeat = 1 }; | |
6ddd2d76 | 3529 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); |
74637e6f LC |
3530 | RDMAContext *rdma; |
3531 | RDMALocalBlocks *local; | |
2da776db MH |
3532 | RDMAControlHeader head; |
3533 | RDMARegister *reg, *registers; | |
3534 | RDMACompress *comp; | |
3535 | RDMARegisterResult *reg_result; | |
3536 | static RDMARegisterResult results[RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE]; | |
3537 | RDMALocalBlock *block; | |
3538 | void *host_addr; | |
3539 | int ret = 0; | |
3540 | int idx = 0; | |
3541 | int count = 0; | |
3542 | int i = 0; | |
3543 | ||
987ab2a5 | 3544 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 3545 | rdma = qatomic_rcu_read(&rioc->rdmain); |
74637e6f LC |
3546 | |
3547 | if (!rdma) { | |
74637e6f LC |
3548 | return -EIO; |
3549 | } | |
3550 | ||
2da776db MH |
3551 | CHECK_ERROR_STATE(); |
3552 | ||
74637e6f | 3553 | local = &rdma->local_ram_blocks; |
2da776db | 3554 | do { |
632e3a5c | 3555 | trace_qemu_rdma_registration_handle_wait(); |
2da776db MH |
3556 | |
3557 | ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_NONE); | |
3558 | ||
3559 | if (ret < 0) { | |
3560 | break; | |
3561 | } | |
3562 | ||
3563 | if (head.repeat > RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE) { | |
733252de DDAG |
3564 | error_report("rdma: Too many requests in this message (%d)." |
3565 | "Bailing.", head.repeat); | |
2da776db MH |
3566 | ret = -EIO; |
3567 | break; | |
3568 | } | |
3569 | ||
3570 | switch (head.type) { | |
3571 | case RDMA_CONTROL_COMPRESS: | |
3572 | comp = (RDMACompress *) rdma->wr_data[idx].control_curr; | |
3573 | network_to_compress(comp); | |
3574 | ||
733252de DDAG |
3575 | trace_qemu_rdma_registration_handle_compress(comp->length, |
3576 | comp->block_idx, | |
3577 | comp->offset); | |
afcddefd DDAG |
3578 | if (comp->block_idx >= rdma->local_ram_blocks.nb_blocks) { |
3579 | error_report("rdma: 'compress' bad block index %u (vs %d)", | |
3580 | (unsigned int)comp->block_idx, | |
3581 | rdma->local_ram_blocks.nb_blocks); | |
3582 | ret = -EIO; | |
24b41d66 | 3583 | goto out; |
afcddefd | 3584 | } |
2da776db MH |
3585 | block = &(rdma->local_ram_blocks.block[comp->block_idx]); |
3586 | ||
3587 | host_addr = block->local_host_addr + | |
3588 | (comp->offset - block->offset); | |
3589 | ||
3590 | ram_handle_compressed(host_addr, comp->value, comp->length); | |
3591 | break; | |
3592 | ||
3593 | case RDMA_CONTROL_REGISTER_FINISHED: | |
733252de | 3594 | trace_qemu_rdma_registration_handle_finished(); |
2da776db MH |
3595 | goto out; |
3596 | ||
3597 | case RDMA_CONTROL_RAM_BLOCKS_REQUEST: | |
733252de | 3598 | trace_qemu_rdma_registration_handle_ram_blocks(); |
2da776db | 3599 | |
e4d63320 DDAG |
3600 | /* Sort our local RAM Block list so it's the same as the source, |
3601 | * we can do this since we've filled in a src_index in the list | |
3602 | * as we received the RAMBlock list earlier. | |
3603 | */ | |
3604 | qsort(rdma->local_ram_blocks.block, | |
3605 | rdma->local_ram_blocks.nb_blocks, | |
3606 | sizeof(RDMALocalBlock), dest_ram_sort_func); | |
71cd7306 LC |
3607 | for (i = 0; i < local->nb_blocks; i++) { |
3608 | local->block[i].index = i; | |
3609 | } | |
3610 | ||
2da776db MH |
3611 | if (rdma->pin_all) { |
3612 | ret = qemu_rdma_reg_whole_ram_blocks(rdma); | |
3613 | if (ret) { | |
733252de DDAG |
3614 | error_report("rdma migration: error dest " |
3615 | "registering ram blocks"); | |
2da776db MH |
3616 | goto out; |
3617 | } | |
3618 | } | |
3619 | ||
3620 | /* | |
3621 | * Dest uses this to prepare to transmit the RAMBlock descriptions | |
3622 | * to the source VM after connection setup. | |
3623 | * Both sides use the "remote" structure to communicate and update | |
3624 | * their "local" descriptions with what was sent. | |
3625 | */ | |
3626 | for (i = 0; i < local->nb_blocks; i++) { | |
a97270ad | 3627 | rdma->dest_blocks[i].remote_host_addr = |
fbce8c25 | 3628 | (uintptr_t)(local->block[i].local_host_addr); |
2da776db MH |
3629 | |
3630 | if (rdma->pin_all) { | |
a97270ad | 3631 | rdma->dest_blocks[i].remote_rkey = local->block[i].mr->rkey; |
2da776db MH |
3632 | } |
3633 | ||
a97270ad DDAG |
3634 | rdma->dest_blocks[i].offset = local->block[i].offset; |
3635 | rdma->dest_blocks[i].length = local->block[i].length; | |
2da776db | 3636 | |
a97270ad | 3637 | dest_block_to_network(&rdma->dest_blocks[i]); |
e4d63320 DDAG |
3638 | trace_qemu_rdma_registration_handle_ram_blocks_loop( |
3639 | local->block[i].block_name, | |
3640 | local->block[i].offset, | |
3641 | local->block[i].length, | |
3642 | local->block[i].local_host_addr, | |
3643 | local->block[i].src_index); | |
2da776db MH |
3644 | } |
3645 | ||
3646 | blocks.len = rdma->local_ram_blocks.nb_blocks | |
a97270ad | 3647 | * sizeof(RDMADestBlock); |
2da776db MH |
3648 | |
3649 | ||
3650 | ret = qemu_rdma_post_send_control(rdma, | |
a97270ad | 3651 | (uint8_t *) rdma->dest_blocks, &blocks); |
2da776db MH |
3652 | |
3653 | if (ret < 0) { | |
733252de | 3654 | error_report("rdma migration: error sending remote info"); |
2da776db MH |
3655 | goto out; |
3656 | } | |
3657 | ||
3658 | break; | |
3659 | case RDMA_CONTROL_REGISTER_REQUEST: | |
733252de | 3660 | trace_qemu_rdma_registration_handle_register(head.repeat); |
2da776db MH |
3661 | |
3662 | reg_resp.repeat = head.repeat; | |
3663 | registers = (RDMARegister *) rdma->wr_data[idx].control_curr; | |
3664 | ||
3665 | for (count = 0; count < head.repeat; count++) { | |
3666 | uint64_t chunk; | |
3667 | uint8_t *chunk_start, *chunk_end; | |
3668 | ||
3669 | reg = ®isters[count]; | |
3670 | network_to_register(reg); | |
3671 | ||
3672 | reg_result = &results[count]; | |
3673 | ||
733252de | 3674 | trace_qemu_rdma_registration_handle_register_loop(count, |
2da776db MH |
3675 | reg->current_index, reg->key.current_addr, reg->chunks); |
3676 | ||
afcddefd DDAG |
3677 | if (reg->current_index >= rdma->local_ram_blocks.nb_blocks) { |
3678 | error_report("rdma: 'register' bad block index %u (vs %d)", | |
3679 | (unsigned int)reg->current_index, | |
3680 | rdma->local_ram_blocks.nb_blocks); | |
3681 | ret = -ENOENT; | |
24b41d66 | 3682 | goto out; |
afcddefd | 3683 | } |
2da776db MH |
3684 | block = &(rdma->local_ram_blocks.block[reg->current_index]); |
3685 | if (block->is_ram_block) { | |
afcddefd DDAG |
3686 | if (block->offset > reg->key.current_addr) { |
3687 | error_report("rdma: bad register address for block %s" | |
3688 | " offset: %" PRIx64 " current_addr: %" PRIx64, | |
3689 | block->block_name, block->offset, | |
3690 | reg->key.current_addr); | |
3691 | ret = -ERANGE; | |
24b41d66 | 3692 | goto out; |
afcddefd | 3693 | } |
2da776db MH |
3694 | host_addr = (block->local_host_addr + |
3695 | (reg->key.current_addr - block->offset)); | |
3696 | chunk = ram_chunk_index(block->local_host_addr, | |
3697 | (uint8_t *) host_addr); | |
3698 | } else { | |
3699 | chunk = reg->key.chunk; | |
3700 | host_addr = block->local_host_addr + | |
3701 | (reg->key.chunk * (1UL << RDMA_REG_CHUNK_SHIFT)); | |
afcddefd DDAG |
3702 | /* Check for particularly bad chunk value */ |
3703 | if (host_addr < (void *)block->local_host_addr) { | |
3704 | error_report("rdma: bad chunk for block %s" | |
3705 | " chunk: %" PRIx64, | |
3706 | block->block_name, reg->key.chunk); | |
3707 | ret = -ERANGE; | |
24b41d66 | 3708 | goto out; |
afcddefd | 3709 | } |
2da776db MH |
3710 | } |
3711 | chunk_start = ram_chunk_start(block, chunk); | |
3712 | chunk_end = ram_chunk_end(block, chunk + reg->chunks); | |
9589e763 MA |
3713 | /* avoid "-Waddress-of-packed-member" warning */ |
3714 | uint32_t tmp_rkey = 0; | |
2da776db | 3715 | if (qemu_rdma_register_and_get_keys(rdma, block, |
9589e763 | 3716 | (uintptr_t)host_addr, NULL, &tmp_rkey, |
2da776db | 3717 | chunk, chunk_start, chunk_end)) { |
733252de | 3718 | error_report("cannot get rkey"); |
2da776db MH |
3719 | ret = -EINVAL; |
3720 | goto out; | |
3721 | } | |
9589e763 | 3722 | reg_result->rkey = tmp_rkey; |
2da776db | 3723 | |
fbce8c25 | 3724 | reg_result->host_addr = (uintptr_t)block->local_host_addr; |
2da776db | 3725 | |
733252de DDAG |
3726 | trace_qemu_rdma_registration_handle_register_rkey( |
3727 | reg_result->rkey); | |
2da776db MH |
3728 | |
3729 | result_to_network(reg_result); | |
3730 | } | |
3731 | ||
3732 | ret = qemu_rdma_post_send_control(rdma, | |
3733 | (uint8_t *) results, ®_resp); | |
3734 | ||
3735 | if (ret < 0) { | |
733252de | 3736 | error_report("Failed to send control buffer"); |
2da776db MH |
3737 | goto out; |
3738 | } | |
3739 | break; | |
3740 | case RDMA_CONTROL_UNREGISTER_REQUEST: | |
733252de | 3741 | trace_qemu_rdma_registration_handle_unregister(head.repeat); |
2da776db MH |
3742 | unreg_resp.repeat = head.repeat; |
3743 | registers = (RDMARegister *) rdma->wr_data[idx].control_curr; | |
3744 | ||
3745 | for (count = 0; count < head.repeat; count++) { | |
3746 | reg = ®isters[count]; | |
3747 | network_to_register(reg); | |
3748 | ||
733252de DDAG |
3749 | trace_qemu_rdma_registration_handle_unregister_loop(count, |
3750 | reg->current_index, reg->key.chunk); | |
2da776db MH |
3751 | |
3752 | block = &(rdma->local_ram_blocks.block[reg->current_index]); | |
3753 | ||
3754 | ret = ibv_dereg_mr(block->pmr[reg->key.chunk]); | |
3755 | block->pmr[reg->key.chunk] = NULL; | |
3756 | ||
3757 | if (ret != 0) { | |
3758 | perror("rdma unregistration chunk failed"); | |
3759 | ret = -ret; | |
3760 | goto out; | |
3761 | } | |
3762 | ||
3763 | rdma->total_registrations--; | |
3764 | ||
733252de DDAG |
3765 | trace_qemu_rdma_registration_handle_unregister_success( |
3766 | reg->key.chunk); | |
2da776db MH |
3767 | } |
3768 | ||
3769 | ret = qemu_rdma_post_send_control(rdma, NULL, &unreg_resp); | |
3770 | ||
3771 | if (ret < 0) { | |
733252de | 3772 | error_report("Failed to send control buffer"); |
2da776db MH |
3773 | goto out; |
3774 | } | |
3775 | break; | |
3776 | case RDMA_CONTROL_REGISTER_RESULT: | |
733252de | 3777 | error_report("Invalid RESULT message at dest."); |
2da776db MH |
3778 | ret = -EIO; |
3779 | goto out; | |
3780 | default: | |
482a33c5 | 3781 | error_report("Unknown control message %s", control_desc(head.type)); |
2da776db MH |
3782 | ret = -EIO; |
3783 | goto out; | |
3784 | } | |
3785 | } while (1); | |
3786 | out: | |
3787 | if (ret < 0) { | |
3788 | rdma->error_state = ret; | |
3789 | } | |
3790 | return ret; | |
3791 | } | |
3792 | ||
e4d63320 DDAG |
3793 | /* Destination: |
3794 | * Called via a ram_control_load_hook during the initial RAM load section which | |
3795 | * lists the RAMBlocks by name. This lets us know the order of the RAMBlocks | |
3796 | * on the source. | |
3797 | * We've already built our local RAMBlock list, but not yet sent the list to | |
3798 | * the source. | |
3799 | */ | |
6ddd2d76 DB |
3800 | static int |
3801 | rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name) | |
e4d63320 | 3802 | { |
74637e6f | 3803 | RDMAContext *rdma; |
e4d63320 DDAG |
3804 | int curr; |
3805 | int found = -1; | |
3806 | ||
987ab2a5 | 3807 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 3808 | rdma = qatomic_rcu_read(&rioc->rdmain); |
74637e6f LC |
3809 | |
3810 | if (!rdma) { | |
74637e6f LC |
3811 | return -EIO; |
3812 | } | |
3813 | ||
e4d63320 DDAG |
3814 | /* Find the matching RAMBlock in our local list */ |
3815 | for (curr = 0; curr < rdma->local_ram_blocks.nb_blocks; curr++) { | |
3816 | if (!strcmp(rdma->local_ram_blocks.block[curr].block_name, name)) { | |
3817 | found = curr; | |
3818 | break; | |
3819 | } | |
3820 | } | |
3821 | ||
3822 | if (found == -1) { | |
3823 | error_report("RAMBlock '%s' not found on destination", name); | |
3824 | return -ENOENT; | |
3825 | } | |
3826 | ||
3827 | rdma->local_ram_blocks.block[curr].src_index = rdma->next_src_index; | |
3828 | trace_rdma_block_notification_handle(name, rdma->next_src_index); | |
3829 | rdma->next_src_index++; | |
3830 | ||
3831 | return 0; | |
3832 | } | |
3833 | ||
365c0463 | 3834 | static int rdma_load_hook(QEMUFile *f, uint64_t flags, void *data) |
632e3a5c | 3835 | { |
365c0463 | 3836 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); |
632e3a5c DDAG |
3837 | switch (flags) { |
3838 | case RAM_CONTROL_BLOCK_REG: | |
365c0463 | 3839 | return rdma_block_notification_handle(rioc, data); |
632e3a5c DDAG |
3840 | |
3841 | case RAM_CONTROL_HOOK: | |
365c0463 | 3842 | return qemu_rdma_registration_handle(f, rioc); |
632e3a5c DDAG |
3843 | |
3844 | default: | |
3845 | /* Shouldn't be called with any other values */ | |
3846 | abort(); | |
3847 | } | |
3848 | } | |
3849 | ||
365c0463 | 3850 | static int qemu_rdma_registration_start(QEMUFile *f, |
632e3a5c | 3851 | uint64_t flags, void *data) |
2da776db | 3852 | { |
365c0463 | 3853 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); |
74637e6f LC |
3854 | RDMAContext *rdma; |
3855 | ||
987ab2a5 | 3856 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 3857 | rdma = qatomic_rcu_read(&rioc->rdmaout); |
74637e6f | 3858 | if (!rdma) { |
74637e6f LC |
3859 | return -EIO; |
3860 | } | |
2da776db MH |
3861 | |
3862 | CHECK_ERROR_STATE(); | |
3863 | ||
6a88eb2b | 3864 | if (migration_in_postcopy()) { |
ccb7e1b5 LC |
3865 | return 0; |
3866 | } | |
3867 | ||
733252de | 3868 | trace_qemu_rdma_registration_start(flags); |
2da776db MH |
3869 | qemu_put_be64(f, RAM_SAVE_FLAG_HOOK); |
3870 | qemu_fflush(f); | |
3871 | ||
3872 | return 0; | |
3873 | } | |
3874 | ||
3875 | /* | |
3876 | * Inform dest that dynamic registrations are done for now. | |
3877 | * First, flush writes, if any. | |
3878 | */ | |
365c0463 | 3879 | static int qemu_rdma_registration_stop(QEMUFile *f, |
632e3a5c | 3880 | uint64_t flags, void *data) |
2da776db | 3881 | { |
365c0463 | 3882 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f)); |
74637e6f | 3883 | RDMAContext *rdma; |
2da776db MH |
3884 | RDMAControlHeader head = { .len = 0, .repeat = 1 }; |
3885 | int ret = 0; | |
3886 | ||
987ab2a5 | 3887 | RCU_READ_LOCK_GUARD(); |
d73415a3 | 3888 | rdma = qatomic_rcu_read(&rioc->rdmaout); |
74637e6f | 3889 | if (!rdma) { |
74637e6f LC |
3890 | return -EIO; |
3891 | } | |
3892 | ||
2da776db MH |
3893 | CHECK_ERROR_STATE(); |
3894 | ||
6a88eb2b | 3895 | if (migration_in_postcopy()) { |
ccb7e1b5 LC |
3896 | return 0; |
3897 | } | |
3898 | ||
2da776db MH |
3899 | qemu_fflush(f); |
3900 | ret = qemu_rdma_drain_cq(f, rdma); | |
3901 | ||
3902 | if (ret < 0) { | |
3903 | goto err; | |
3904 | } | |
3905 | ||
3906 | if (flags == RAM_CONTROL_SETUP) { | |
3907 | RDMAControlHeader resp = {.type = RDMA_CONTROL_RAM_BLOCKS_RESULT }; | |
3908 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
e4d63320 | 3909 | int reg_result_idx, i, nb_dest_blocks; |
2da776db MH |
3910 | |
3911 | head.type = RDMA_CONTROL_RAM_BLOCKS_REQUEST; | |
733252de | 3912 | trace_qemu_rdma_registration_stop_ram(); |
2da776db MH |
3913 | |
3914 | /* | |
3915 | * Make sure that we parallelize the pinning on both sides. | |
3916 | * For very large guests, doing this serially takes a really | |
3917 | * long time, so we have to 'interleave' the pinning locally | |
3918 | * with the control messages by performing the pinning on this | |
3919 | * side before we receive the control response from the other | |
3920 | * side that the pinning has completed. | |
3921 | */ | |
3922 | ret = qemu_rdma_exchange_send(rdma, &head, NULL, &resp, | |
3923 | ®_result_idx, rdma->pin_all ? | |
3924 | qemu_rdma_reg_whole_ram_blocks : NULL); | |
3925 | if (ret < 0) { | |
9cde9caa | 3926 | fprintf(stderr, "receiving remote info!"); |
2da776db MH |
3927 | return ret; |
3928 | } | |
3929 | ||
a97270ad | 3930 | nb_dest_blocks = resp.len / sizeof(RDMADestBlock); |
2da776db MH |
3931 | |
3932 | /* | |
3933 | * The protocol uses two different sets of rkeys (mutually exclusive): | |
3934 | * 1. One key to represent the virtual address of the entire ram block. | |
3935 | * (dynamic chunk registration disabled - pin everything with one rkey.) | |
3936 | * 2. One to represent individual chunks within a ram block. | |
3937 | * (dynamic chunk registration enabled - pin individual chunks.) | |
3938 | * | |
3939 | * Once the capability is successfully negotiated, the destination transmits | |
3940 | * the keys to use (or sends them later) including the virtual addresses | |
3941 | * and then propagates the remote ram block descriptions to his local copy. | |
3942 | */ | |
3943 | ||
a97270ad | 3944 | if (local->nb_blocks != nb_dest_blocks) { |
9cde9caa MA |
3945 | fprintf(stderr, "ram blocks mismatch (Number of blocks %d vs %d) " |
3946 | "Your QEMU command line parameters are probably " | |
3947 | "not identical on both the source and destination.", | |
3948 | local->nb_blocks, nb_dest_blocks); | |
ef4b722d | 3949 | rdma->error_state = -EINVAL; |
2da776db MH |
3950 | return -EINVAL; |
3951 | } | |
3952 | ||
885e8f98 | 3953 | qemu_rdma_move_header(rdma, reg_result_idx, &resp); |
a97270ad | 3954 | memcpy(rdma->dest_blocks, |
885e8f98 | 3955 | rdma->wr_data[reg_result_idx].control_curr, resp.len); |
a97270ad DDAG |
3956 | for (i = 0; i < nb_dest_blocks; i++) { |
3957 | network_to_dest_block(&rdma->dest_blocks[i]); | |
2da776db | 3958 | |
e4d63320 DDAG |
3959 | /* We require that the blocks are in the same order */ |
3960 | if (rdma->dest_blocks[i].length != local->block[i].length) { | |
9cde9caa MA |
3961 | fprintf(stderr, "Block %s/%d has a different length %" PRIu64 |
3962 | "vs %" PRIu64, local->block[i].block_name, i, | |
3963 | local->block[i].length, | |
3964 | rdma->dest_blocks[i].length); | |
ef4b722d | 3965 | rdma->error_state = -EINVAL; |
2da776db MH |
3966 | return -EINVAL; |
3967 | } | |
e4d63320 DDAG |
3968 | local->block[i].remote_host_addr = |
3969 | rdma->dest_blocks[i].remote_host_addr; | |
3970 | local->block[i].remote_rkey = rdma->dest_blocks[i].remote_rkey; | |
2da776db MH |
3971 | } |
3972 | } | |
3973 | ||
733252de | 3974 | trace_qemu_rdma_registration_stop(flags); |
2da776db MH |
3975 | |
3976 | head.type = RDMA_CONTROL_REGISTER_FINISHED; | |
3977 | ret = qemu_rdma_exchange_send(rdma, &head, NULL, NULL, NULL, NULL); | |
3978 | ||
3979 | if (ret < 0) { | |
3980 | goto err; | |
3981 | } | |
3982 | ||
3983 | return 0; | |
3984 | err: | |
3985 | rdma->error_state = ret; | |
3986 | return ret; | |
3987 | } | |
3988 | ||
0436e09f | 3989 | static const QEMUFileHooks rdma_read_hooks = { |
632e3a5c | 3990 | .hook_ram_load = rdma_load_hook, |
2da776db MH |
3991 | }; |
3992 | ||
0436e09f | 3993 | static const QEMUFileHooks rdma_write_hooks = { |
2da776db MH |
3994 | .before_ram_iterate = qemu_rdma_registration_start, |
3995 | .after_ram_iterate = qemu_rdma_registration_stop, | |
3996 | .save_page = qemu_rdma_save_page, | |
3997 | }; | |
3998 | ||
6ddd2d76 DB |
3999 | |
4000 | static void qio_channel_rdma_finalize(Object *obj) | |
4001 | { | |
4002 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(obj); | |
74637e6f LC |
4003 | if (rioc->rdmain) { |
4004 | qemu_rdma_cleanup(rioc->rdmain); | |
4005 | g_free(rioc->rdmain); | |
4006 | rioc->rdmain = NULL; | |
4007 | } | |
4008 | if (rioc->rdmaout) { | |
4009 | qemu_rdma_cleanup(rioc->rdmaout); | |
4010 | g_free(rioc->rdmaout); | |
4011 | rioc->rdmaout = NULL; | |
6ddd2d76 DB |
4012 | } |
4013 | } | |
4014 | ||
4015 | static void qio_channel_rdma_class_init(ObjectClass *klass, | |
4016 | void *class_data G_GNUC_UNUSED) | |
4017 | { | |
4018 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
4019 | ||
4020 | ioc_klass->io_writev = qio_channel_rdma_writev; | |
4021 | ioc_klass->io_readv = qio_channel_rdma_readv; | |
4022 | ioc_klass->io_set_blocking = qio_channel_rdma_set_blocking; | |
4023 | ioc_klass->io_close = qio_channel_rdma_close; | |
4024 | ioc_klass->io_create_watch = qio_channel_rdma_create_watch; | |
4d9f675b | 4025 | ioc_klass->io_set_aio_fd_handler = qio_channel_rdma_set_aio_fd_handler; |
54db882f | 4026 | ioc_klass->io_shutdown = qio_channel_rdma_shutdown; |
6ddd2d76 DB |
4027 | } |
4028 | ||
4029 | static const TypeInfo qio_channel_rdma_info = { | |
4030 | .parent = TYPE_QIO_CHANNEL, | |
4031 | .name = TYPE_QIO_CHANNEL_RDMA, | |
4032 | .instance_size = sizeof(QIOChannelRDMA), | |
4033 | .instance_finalize = qio_channel_rdma_finalize, | |
4034 | .class_init = qio_channel_rdma_class_init, | |
4035 | }; | |
4036 | ||
4037 | static void qio_channel_rdma_register_types(void) | |
4038 | { | |
4039 | type_register_static(&qio_channel_rdma_info); | |
4040 | } | |
4041 | ||
4042 | type_init(qio_channel_rdma_register_types); | |
4043 | ||
4044 | static QEMUFile *qemu_fopen_rdma(RDMAContext *rdma, const char *mode) | |
2da776db | 4045 | { |
6ddd2d76 | 4046 | QIOChannelRDMA *rioc; |
2da776db MH |
4047 | |
4048 | if (qemu_file_mode_is_not_valid(mode)) { | |
4049 | return NULL; | |
4050 | } | |
4051 | ||
6ddd2d76 | 4052 | rioc = QIO_CHANNEL_RDMA(object_new(TYPE_QIO_CHANNEL_RDMA)); |
2da776db MH |
4053 | |
4054 | if (mode[0] == 'w') { | |
6ddd2d76 | 4055 | rioc->file = qemu_fopen_channel_output(QIO_CHANNEL(rioc)); |
74637e6f LC |
4056 | rioc->rdmaout = rdma; |
4057 | rioc->rdmain = rdma->return_path; | |
6ddd2d76 | 4058 | qemu_file_set_hooks(rioc->file, &rdma_write_hooks); |
2da776db | 4059 | } else { |
6ddd2d76 | 4060 | rioc->file = qemu_fopen_channel_input(QIO_CHANNEL(rioc)); |
74637e6f LC |
4061 | rioc->rdmain = rdma; |
4062 | rioc->rdmaout = rdma->return_path; | |
6ddd2d76 | 4063 | qemu_file_set_hooks(rioc->file, &rdma_read_hooks); |
2da776db MH |
4064 | } |
4065 | ||
6ddd2d76 | 4066 | return rioc->file; |
2da776db MH |
4067 | } |
4068 | ||
4069 | static void rdma_accept_incoming_migration(void *opaque) | |
4070 | { | |
4071 | RDMAContext *rdma = opaque; | |
4072 | int ret; | |
4073 | QEMUFile *f; | |
2a1bc8bd | 4074 | Error *local_err = NULL; |
2da776db | 4075 | |
24ec68ef | 4076 | trace_qemu_rdma_accept_incoming_migration(); |
2da776db MH |
4077 | ret = qemu_rdma_accept(rdma); |
4078 | ||
4079 | if (ret) { | |
2a1bc8bd | 4080 | fprintf(stderr, "RDMA ERROR: Migration initialization failed\n"); |
2da776db MH |
4081 | return; |
4082 | } | |
4083 | ||
24ec68ef | 4084 | trace_qemu_rdma_accept_incoming_migration_accepted(); |
2da776db | 4085 | |
55cc1b59 LC |
4086 | if (rdma->is_return_path) { |
4087 | return; | |
4088 | } | |
4089 | ||
2da776db MH |
4090 | f = qemu_fopen_rdma(rdma, "rb"); |
4091 | if (f == NULL) { | |
2a1bc8bd | 4092 | fprintf(stderr, "RDMA ERROR: could not qemu_fopen_rdma\n"); |
2da776db MH |
4093 | qemu_rdma_cleanup(rdma); |
4094 | return; | |
4095 | } | |
4096 | ||
4097 | rdma->migration_started_on_destination = 1; | |
2a1bc8bd DDAG |
4098 | migration_fd_process_incoming(f, &local_err); |
4099 | if (local_err) { | |
4100 | error_reportf_err(local_err, "RDMA ERROR:"); | |
4101 | } | |
2da776db MH |
4102 | } |
4103 | ||
4104 | void rdma_start_incoming_migration(const char *host_port, Error **errp) | |
4105 | { | |
4106 | int ret; | |
449f91b2 | 4107 | RDMAContext *rdma, *rdma_return_path = NULL; |
2da776db MH |
4108 | Error *local_err = NULL; |
4109 | ||
733252de | 4110 | trace_rdma_start_incoming_migration(); |
2da776db | 4111 | |
5f1f1902 DH |
4112 | /* Avoid ram_block_discard_disable(), cannot change during migration. */ |
4113 | if (ram_block_discard_is_required()) { | |
4114 | error_setg(errp, "RDMA: cannot disable RAM discard"); | |
4115 | return; | |
4116 | } | |
4117 | ||
4118 | rdma = qemu_rdma_data_init(host_port, &local_err); | |
2da776db MH |
4119 | if (rdma == NULL) { |
4120 | goto err; | |
4121 | } | |
4122 | ||
4123 | ret = qemu_rdma_dest_init(rdma, &local_err); | |
4124 | ||
4125 | if (ret) { | |
4126 | goto err; | |
4127 | } | |
4128 | ||
733252de | 4129 | trace_rdma_start_incoming_migration_after_dest_init(); |
2da776db MH |
4130 | |
4131 | ret = rdma_listen(rdma->listen_id, 5); | |
4132 | ||
4133 | if (ret) { | |
66988941 | 4134 | ERROR(errp, "listening on socket!"); |
4e812d23 | 4135 | goto cleanup_rdma; |
2da776db MH |
4136 | } |
4137 | ||
733252de | 4138 | trace_rdma_start_incoming_migration_after_rdma_listen(); |
2da776db | 4139 | |
82e1cc4b FZ |
4140 | qemu_set_fd_handler(rdma->channel->fd, rdma_accept_incoming_migration, |
4141 | NULL, (void *)(intptr_t)rdma); | |
2da776db | 4142 | return; |
4e812d23 LZ |
4143 | |
4144 | cleanup_rdma: | |
4145 | qemu_rdma_cleanup(rdma); | |
2da776db MH |
4146 | err: |
4147 | error_propagate(errp, local_err); | |
3b59ee72 PN |
4148 | if (rdma) { |
4149 | g_free(rdma->host); | |
44bcfd45 | 4150 | g_free(rdma->host_port); |
3b59ee72 | 4151 | } |
2da776db | 4152 | g_free(rdma); |
55cc1b59 | 4153 | g_free(rdma_return_path); |
2da776db MH |
4154 | } |
4155 | ||
4156 | void rdma_start_outgoing_migration(void *opaque, | |
4157 | const char *host_port, Error **errp) | |
4158 | { | |
4159 | MigrationState *s = opaque; | |
55cc1b59 | 4160 | RDMAContext *rdma_return_path = NULL; |
5f1f1902 | 4161 | RDMAContext *rdma; |
2da776db MH |
4162 | int ret = 0; |
4163 | ||
5f1f1902 DH |
4164 | /* Avoid ram_block_discard_disable(), cannot change during migration. */ |
4165 | if (ram_block_discard_is_required()) { | |
4166 | error_setg(errp, "RDMA: cannot disable RAM discard"); | |
4167 | return; | |
4168 | } | |
4169 | ||
4170 | rdma = qemu_rdma_data_init(host_port, errp); | |
2da776db | 4171 | if (rdma == NULL) { |
2da776db MH |
4172 | goto err; |
4173 | } | |
4174 | ||
bbfb89e3 FZ |
4175 | ret = qemu_rdma_source_init(rdma, |
4176 | s->enabled_capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL], errp); | |
2da776db MH |
4177 | |
4178 | if (ret) { | |
4179 | goto err; | |
4180 | } | |
4181 | ||
733252de | 4182 | trace_rdma_start_outgoing_migration_after_rdma_source_init(); |
e49e49dd | 4183 | ret = qemu_rdma_connect(rdma, errp, false); |
2da776db MH |
4184 | |
4185 | if (ret) { | |
4186 | goto err; | |
4187 | } | |
4188 | ||
3a4452d8 | 4189 | /* RDMA postcopy need a separate queue pair for return path */ |
55cc1b59 LC |
4190 | if (migrate_postcopy()) { |
4191 | rdma_return_path = qemu_rdma_data_init(host_port, errp); | |
4192 | ||
4193 | if (rdma_return_path == NULL) { | |
2f0c285a | 4194 | goto return_path_err; |
55cc1b59 LC |
4195 | } |
4196 | ||
4197 | ret = qemu_rdma_source_init(rdma_return_path, | |
4198 | s->enabled_capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL], errp); | |
4199 | ||
4200 | if (ret) { | |
2f0c285a | 4201 | goto return_path_err; |
55cc1b59 LC |
4202 | } |
4203 | ||
e49e49dd | 4204 | ret = qemu_rdma_connect(rdma_return_path, errp, true); |
55cc1b59 LC |
4205 | |
4206 | if (ret) { | |
2f0c285a | 4207 | goto return_path_err; |
55cc1b59 LC |
4208 | } |
4209 | ||
4210 | rdma->return_path = rdma_return_path; | |
4211 | rdma_return_path->return_path = rdma; | |
4212 | rdma_return_path->is_return_path = true; | |
4213 | } | |
4214 | ||
733252de | 4215 | trace_rdma_start_outgoing_migration_after_rdma_connect(); |
2da776db | 4216 | |
89a02a9f | 4217 | s->to_dst_file = qemu_fopen_rdma(rdma, "wb"); |
cce8040b | 4218 | migrate_fd_connect(s, NULL); |
2da776db | 4219 | return; |
2f0c285a PN |
4220 | return_path_err: |
4221 | qemu_rdma_cleanup(rdma); | |
2da776db | 4222 | err: |
2da776db | 4223 | g_free(rdma); |
55cc1b59 | 4224 | g_free(rdma_return_path); |
2da776db | 4225 | } |