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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 | */ | |
1393a485 | 16 | #include "qemu/osdep.h" |
da34e65c | 17 | #include "qapi/error.h" |
2da776db | 18 | #include "qemu-common.h" |
f348b6d1 | 19 | #include "qemu/cutils.h" |
2da776db MH |
20 | #include "migration/migration.h" |
21 | #include "migration/qemu-file.h" | |
22 | #include "exec/cpu-common.h" | |
d49b6836 | 23 | #include "qemu/error-report.h" |
2da776db MH |
24 | #include "qemu/main-loop.h" |
25 | #include "qemu/sockets.h" | |
26 | #include "qemu/bitmap.h" | |
10817bf0 | 27 | #include "qemu/coroutine.h" |
2da776db MH |
28 | #include <sys/socket.h> |
29 | #include <netdb.h> | |
30 | #include <arpa/inet.h> | |
2da776db | 31 | #include <rdma/rdma_cma.h> |
733252de | 32 | #include "trace.h" |
2da776db MH |
33 | |
34 | /* | |
35 | * Print and error on both the Monitor and the Log file. | |
36 | */ | |
37 | #define ERROR(errp, fmt, ...) \ | |
38 | do { \ | |
66988941 | 39 | fprintf(stderr, "RDMA ERROR: " fmt "\n", ## __VA_ARGS__); \ |
2da776db MH |
40 | if (errp && (*(errp) == NULL)) { \ |
41 | error_setg(errp, "RDMA ERROR: " fmt, ## __VA_ARGS__); \ | |
42 | } \ | |
43 | } while (0) | |
44 | ||
45 | #define RDMA_RESOLVE_TIMEOUT_MS 10000 | |
46 | ||
47 | /* Do not merge data if larger than this. */ | |
48 | #define RDMA_MERGE_MAX (2 * 1024 * 1024) | |
49 | #define RDMA_SIGNALED_SEND_MAX (RDMA_MERGE_MAX / 4096) | |
50 | ||
51 | #define RDMA_REG_CHUNK_SHIFT 20 /* 1 MB */ | |
52 | ||
53 | /* | |
54 | * This is only for non-live state being migrated. | |
55 | * Instead of RDMA_WRITE messages, we use RDMA_SEND | |
56 | * messages for that state, which requires a different | |
57 | * delivery design than main memory. | |
58 | */ | |
59 | #define RDMA_SEND_INCREMENT 32768 | |
60 | ||
61 | /* | |
62 | * Maximum size infiniband SEND message | |
63 | */ | |
64 | #define RDMA_CONTROL_MAX_BUFFER (512 * 1024) | |
65 | #define RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE 4096 | |
66 | ||
67 | #define RDMA_CONTROL_VERSION_CURRENT 1 | |
68 | /* | |
69 | * Capabilities for negotiation. | |
70 | */ | |
71 | #define RDMA_CAPABILITY_PIN_ALL 0x01 | |
72 | ||
73 | /* | |
74 | * Add the other flags above to this list of known capabilities | |
75 | * as they are introduced. | |
76 | */ | |
77 | static uint32_t known_capabilities = RDMA_CAPABILITY_PIN_ALL; | |
78 | ||
79 | #define CHECK_ERROR_STATE() \ | |
80 | do { \ | |
81 | if (rdma->error_state) { \ | |
82 | if (!rdma->error_reported) { \ | |
733252de DDAG |
83 | error_report("RDMA is in an error state waiting migration" \ |
84 | " to abort!"); \ | |
2da776db MH |
85 | rdma->error_reported = 1; \ |
86 | } \ | |
87 | return rdma->error_state; \ | |
88 | } \ | |
89 | } while (0); | |
90 | ||
91 | /* | |
92 | * A work request ID is 64-bits and we split up these bits | |
93 | * into 3 parts: | |
94 | * | |
95 | * bits 0-15 : type of control message, 2^16 | |
96 | * bits 16-29: ram block index, 2^14 | |
97 | * bits 30-63: ram block chunk number, 2^34 | |
98 | * | |
99 | * The last two bit ranges are only used for RDMA writes, | |
100 | * in order to track their completion and potentially | |
101 | * also track unregistration status of the message. | |
102 | */ | |
103 | #define RDMA_WRID_TYPE_SHIFT 0UL | |
104 | #define RDMA_WRID_BLOCK_SHIFT 16UL | |
105 | #define RDMA_WRID_CHUNK_SHIFT 30UL | |
106 | ||
107 | #define RDMA_WRID_TYPE_MASK \ | |
108 | ((1UL << RDMA_WRID_BLOCK_SHIFT) - 1UL) | |
109 | ||
110 | #define RDMA_WRID_BLOCK_MASK \ | |
111 | (~RDMA_WRID_TYPE_MASK & ((1UL << RDMA_WRID_CHUNK_SHIFT) - 1UL)) | |
112 | ||
113 | #define RDMA_WRID_CHUNK_MASK (~RDMA_WRID_BLOCK_MASK & ~RDMA_WRID_TYPE_MASK) | |
114 | ||
115 | /* | |
116 | * RDMA migration protocol: | |
117 | * 1. RDMA Writes (data messages, i.e. RAM) | |
118 | * 2. IB Send/Recv (control channel messages) | |
119 | */ | |
120 | enum { | |
121 | RDMA_WRID_NONE = 0, | |
122 | RDMA_WRID_RDMA_WRITE = 1, | |
123 | RDMA_WRID_SEND_CONTROL = 2000, | |
124 | RDMA_WRID_RECV_CONTROL = 4000, | |
125 | }; | |
126 | ||
2ae31aea | 127 | static const char *wrid_desc[] = { |
2da776db MH |
128 | [RDMA_WRID_NONE] = "NONE", |
129 | [RDMA_WRID_RDMA_WRITE] = "WRITE RDMA", | |
130 | [RDMA_WRID_SEND_CONTROL] = "CONTROL SEND", | |
131 | [RDMA_WRID_RECV_CONTROL] = "CONTROL RECV", | |
132 | }; | |
133 | ||
134 | /* | |
135 | * Work request IDs for IB SEND messages only (not RDMA writes). | |
136 | * This is used by the migration protocol to transmit | |
137 | * control messages (such as device state and registration commands) | |
138 | * | |
139 | * We could use more WRs, but we have enough for now. | |
140 | */ | |
141 | enum { | |
142 | RDMA_WRID_READY = 0, | |
143 | RDMA_WRID_DATA, | |
144 | RDMA_WRID_CONTROL, | |
145 | RDMA_WRID_MAX, | |
146 | }; | |
147 | ||
148 | /* | |
149 | * SEND/RECV IB Control Messages. | |
150 | */ | |
151 | enum { | |
152 | RDMA_CONTROL_NONE = 0, | |
153 | RDMA_CONTROL_ERROR, | |
154 | RDMA_CONTROL_READY, /* ready to receive */ | |
155 | RDMA_CONTROL_QEMU_FILE, /* QEMUFile-transmitted bytes */ | |
156 | RDMA_CONTROL_RAM_BLOCKS_REQUEST, /* RAMBlock synchronization */ | |
157 | RDMA_CONTROL_RAM_BLOCKS_RESULT, /* RAMBlock synchronization */ | |
158 | RDMA_CONTROL_COMPRESS, /* page contains repeat values */ | |
159 | RDMA_CONTROL_REGISTER_REQUEST, /* dynamic page registration */ | |
160 | RDMA_CONTROL_REGISTER_RESULT, /* key to use after registration */ | |
161 | RDMA_CONTROL_REGISTER_FINISHED, /* current iteration finished */ | |
162 | RDMA_CONTROL_UNREGISTER_REQUEST, /* dynamic UN-registration */ | |
163 | RDMA_CONTROL_UNREGISTER_FINISHED, /* unpinning finished */ | |
164 | }; | |
165 | ||
2ae31aea | 166 | static const char *control_desc[] = { |
2da776db MH |
167 | [RDMA_CONTROL_NONE] = "NONE", |
168 | [RDMA_CONTROL_ERROR] = "ERROR", | |
169 | [RDMA_CONTROL_READY] = "READY", | |
170 | [RDMA_CONTROL_QEMU_FILE] = "QEMU FILE", | |
171 | [RDMA_CONTROL_RAM_BLOCKS_REQUEST] = "RAM BLOCKS REQUEST", | |
172 | [RDMA_CONTROL_RAM_BLOCKS_RESULT] = "RAM BLOCKS RESULT", | |
173 | [RDMA_CONTROL_COMPRESS] = "COMPRESS", | |
174 | [RDMA_CONTROL_REGISTER_REQUEST] = "REGISTER REQUEST", | |
175 | [RDMA_CONTROL_REGISTER_RESULT] = "REGISTER RESULT", | |
176 | [RDMA_CONTROL_REGISTER_FINISHED] = "REGISTER FINISHED", | |
177 | [RDMA_CONTROL_UNREGISTER_REQUEST] = "UNREGISTER REQUEST", | |
178 | [RDMA_CONTROL_UNREGISTER_FINISHED] = "UNREGISTER FINISHED", | |
179 | }; | |
180 | ||
181 | /* | |
182 | * Memory and MR structures used to represent an IB Send/Recv work request. | |
183 | * This is *not* used for RDMA writes, only IB Send/Recv. | |
184 | */ | |
185 | typedef struct { | |
186 | uint8_t control[RDMA_CONTROL_MAX_BUFFER]; /* actual buffer to register */ | |
187 | struct ibv_mr *control_mr; /* registration metadata */ | |
188 | size_t control_len; /* length of the message */ | |
189 | uint8_t *control_curr; /* start of unconsumed bytes */ | |
190 | } RDMAWorkRequestData; | |
191 | ||
192 | /* | |
193 | * Negotiate RDMA capabilities during connection-setup time. | |
194 | */ | |
195 | typedef struct { | |
196 | uint32_t version; | |
197 | uint32_t flags; | |
198 | } RDMACapabilities; | |
199 | ||
200 | static void caps_to_network(RDMACapabilities *cap) | |
201 | { | |
202 | cap->version = htonl(cap->version); | |
203 | cap->flags = htonl(cap->flags); | |
204 | } | |
205 | ||
206 | static void network_to_caps(RDMACapabilities *cap) | |
207 | { | |
208 | cap->version = ntohl(cap->version); | |
209 | cap->flags = ntohl(cap->flags); | |
210 | } | |
211 | ||
212 | /* | |
213 | * Representation of a RAMBlock from an RDMA perspective. | |
214 | * This is not transmitted, only local. | |
215 | * This and subsequent structures cannot be linked lists | |
216 | * because we're using a single IB message to transmit | |
217 | * the information. It's small anyway, so a list is overkill. | |
218 | */ | |
219 | typedef struct RDMALocalBlock { | |
4fb5364b DDAG |
220 | char *block_name; |
221 | uint8_t *local_host_addr; /* local virtual address */ | |
222 | uint64_t remote_host_addr; /* remote virtual address */ | |
223 | uint64_t offset; | |
224 | uint64_t length; | |
225 | struct ibv_mr **pmr; /* MRs for chunk-level registration */ | |
226 | struct ibv_mr *mr; /* MR for non-chunk-level registration */ | |
227 | uint32_t *remote_keys; /* rkeys for chunk-level registration */ | |
228 | uint32_t remote_rkey; /* rkeys for non-chunk-level registration */ | |
229 | int index; /* which block are we */ | |
e4d63320 | 230 | unsigned int src_index; /* (Only used on dest) */ |
4fb5364b DDAG |
231 | bool is_ram_block; |
232 | int nb_chunks; | |
2da776db MH |
233 | unsigned long *transit_bitmap; |
234 | unsigned long *unregister_bitmap; | |
235 | } RDMALocalBlock; | |
236 | ||
237 | /* | |
238 | * Also represents a RAMblock, but only on the dest. | |
239 | * This gets transmitted by the dest during connection-time | |
240 | * to the source VM and then is used to populate the | |
241 | * corresponding RDMALocalBlock with | |
242 | * the information needed to perform the actual RDMA. | |
243 | */ | |
a97270ad | 244 | typedef struct QEMU_PACKED RDMADestBlock { |
2da776db MH |
245 | uint64_t remote_host_addr; |
246 | uint64_t offset; | |
247 | uint64_t length; | |
248 | uint32_t remote_rkey; | |
249 | uint32_t padding; | |
a97270ad | 250 | } RDMADestBlock; |
2da776db MH |
251 | |
252 | static uint64_t htonll(uint64_t v) | |
253 | { | |
254 | union { uint32_t lv[2]; uint64_t llv; } u; | |
255 | u.lv[0] = htonl(v >> 32); | |
256 | u.lv[1] = htonl(v & 0xFFFFFFFFULL); | |
257 | return u.llv; | |
258 | } | |
259 | ||
260 | static uint64_t ntohll(uint64_t v) { | |
261 | union { uint32_t lv[2]; uint64_t llv; } u; | |
262 | u.llv = v; | |
263 | return ((uint64_t)ntohl(u.lv[0]) << 32) | (uint64_t) ntohl(u.lv[1]); | |
264 | } | |
265 | ||
a97270ad | 266 | static void dest_block_to_network(RDMADestBlock *db) |
2da776db | 267 | { |
a97270ad DDAG |
268 | db->remote_host_addr = htonll(db->remote_host_addr); |
269 | db->offset = htonll(db->offset); | |
270 | db->length = htonll(db->length); | |
271 | db->remote_rkey = htonl(db->remote_rkey); | |
2da776db MH |
272 | } |
273 | ||
a97270ad | 274 | static void network_to_dest_block(RDMADestBlock *db) |
2da776db | 275 | { |
a97270ad DDAG |
276 | db->remote_host_addr = ntohll(db->remote_host_addr); |
277 | db->offset = ntohll(db->offset); | |
278 | db->length = ntohll(db->length); | |
279 | db->remote_rkey = ntohl(db->remote_rkey); | |
2da776db MH |
280 | } |
281 | ||
282 | /* | |
283 | * Virtual address of the above structures used for transmitting | |
284 | * the RAMBlock descriptions at connection-time. | |
285 | * This structure is *not* transmitted. | |
286 | */ | |
287 | typedef struct RDMALocalBlocks { | |
288 | int nb_blocks; | |
289 | bool init; /* main memory init complete */ | |
290 | RDMALocalBlock *block; | |
291 | } RDMALocalBlocks; | |
292 | ||
293 | /* | |
294 | * Main data structure for RDMA state. | |
295 | * While there is only one copy of this structure being allocated right now, | |
296 | * this is the place where one would start if you wanted to consider | |
297 | * having more than one RDMA connection open at the same time. | |
298 | */ | |
299 | typedef struct RDMAContext { | |
300 | char *host; | |
301 | int port; | |
302 | ||
1f22364b | 303 | RDMAWorkRequestData wr_data[RDMA_WRID_MAX]; |
2da776db MH |
304 | |
305 | /* | |
306 | * This is used by *_exchange_send() to figure out whether or not | |
307 | * the initial "READY" message has already been received or not. | |
308 | * This is because other functions may potentially poll() and detect | |
309 | * the READY message before send() does, in which case we need to | |
310 | * know if it completed. | |
311 | */ | |
312 | int control_ready_expected; | |
313 | ||
314 | /* number of outstanding writes */ | |
315 | int nb_sent; | |
316 | ||
317 | /* store info about current buffer so that we can | |
318 | merge it with future sends */ | |
319 | uint64_t current_addr; | |
320 | uint64_t current_length; | |
321 | /* index of ram block the current buffer belongs to */ | |
322 | int current_index; | |
323 | /* index of the chunk in the current ram block */ | |
324 | int current_chunk; | |
325 | ||
326 | bool pin_all; | |
327 | ||
328 | /* | |
329 | * infiniband-specific variables for opening the device | |
330 | * and maintaining connection state and so forth. | |
331 | * | |
332 | * cm_id also has ibv_context, rdma_event_channel, and ibv_qp in | |
333 | * cm_id->verbs, cm_id->channel, and cm_id->qp. | |
334 | */ | |
335 | struct rdma_cm_id *cm_id; /* connection manager ID */ | |
336 | struct rdma_cm_id *listen_id; | |
5a91337c | 337 | bool connected; |
2da776db MH |
338 | |
339 | struct ibv_context *verbs; | |
340 | struct rdma_event_channel *channel; | |
341 | struct ibv_qp *qp; /* queue pair */ | |
342 | struct ibv_comp_channel *comp_channel; /* completion channel */ | |
343 | struct ibv_pd *pd; /* protection domain */ | |
344 | struct ibv_cq *cq; /* completion queue */ | |
345 | ||
346 | /* | |
347 | * If a previous write failed (perhaps because of a failed | |
348 | * memory registration, then do not attempt any future work | |
349 | * and remember the error state. | |
350 | */ | |
351 | int error_state; | |
352 | int error_reported; | |
353 | ||
354 | /* | |
355 | * Description of ram blocks used throughout the code. | |
356 | */ | |
357 | RDMALocalBlocks local_ram_blocks; | |
a97270ad | 358 | RDMADestBlock *dest_blocks; |
2da776db | 359 | |
e4d63320 DDAG |
360 | /* Index of the next RAMBlock received during block registration */ |
361 | unsigned int next_src_index; | |
362 | ||
2da776db MH |
363 | /* |
364 | * Migration on *destination* started. | |
365 | * Then use coroutine yield function. | |
366 | * Source runs in a thread, so we don't care. | |
367 | */ | |
368 | int migration_started_on_destination; | |
369 | ||
370 | int total_registrations; | |
371 | int total_writes; | |
372 | ||
373 | int unregister_current, unregister_next; | |
374 | uint64_t unregistrations[RDMA_SIGNALED_SEND_MAX]; | |
375 | ||
376 | GHashTable *blockmap; | |
377 | } RDMAContext; | |
378 | ||
6ddd2d76 DB |
379 | #define TYPE_QIO_CHANNEL_RDMA "qio-channel-rdma" |
380 | #define QIO_CHANNEL_RDMA(obj) \ | |
381 | OBJECT_CHECK(QIOChannelRDMA, (obj), TYPE_QIO_CHANNEL_RDMA) | |
382 | ||
383 | typedef struct QIOChannelRDMA QIOChannelRDMA; | |
384 | ||
385 | ||
386 | struct QIOChannelRDMA { | |
387 | QIOChannel parent; | |
2da776db | 388 | RDMAContext *rdma; |
6ddd2d76 | 389 | QEMUFile *file; |
2da776db | 390 | size_t len; |
6ddd2d76 DB |
391 | bool blocking; /* XXX we don't actually honour this yet */ |
392 | }; | |
2da776db MH |
393 | |
394 | /* | |
395 | * Main structure for IB Send/Recv control messages. | |
396 | * This gets prepended at the beginning of every Send/Recv. | |
397 | */ | |
398 | typedef struct QEMU_PACKED { | |
399 | uint32_t len; /* Total length of data portion */ | |
400 | uint32_t type; /* which control command to perform */ | |
401 | uint32_t repeat; /* number of commands in data portion of same type */ | |
402 | uint32_t padding; | |
403 | } RDMAControlHeader; | |
404 | ||
405 | static void control_to_network(RDMAControlHeader *control) | |
406 | { | |
407 | control->type = htonl(control->type); | |
408 | control->len = htonl(control->len); | |
409 | control->repeat = htonl(control->repeat); | |
410 | } | |
411 | ||
412 | static void network_to_control(RDMAControlHeader *control) | |
413 | { | |
414 | control->type = ntohl(control->type); | |
415 | control->len = ntohl(control->len); | |
416 | control->repeat = ntohl(control->repeat); | |
417 | } | |
418 | ||
419 | /* | |
420 | * Register a single Chunk. | |
421 | * Information sent by the source VM to inform the dest | |
422 | * to register an single chunk of memory before we can perform | |
423 | * the actual RDMA operation. | |
424 | */ | |
425 | typedef struct QEMU_PACKED { | |
426 | union QEMU_PACKED { | |
b12f7777 | 427 | uint64_t current_addr; /* offset into the ram_addr_t space */ |
2da776db MH |
428 | uint64_t chunk; /* chunk to lookup if unregistering */ |
429 | } key; | |
430 | uint32_t current_index; /* which ramblock the chunk belongs to */ | |
431 | uint32_t padding; | |
432 | uint64_t chunks; /* how many sequential chunks to register */ | |
433 | } RDMARegister; | |
434 | ||
b12f7777 | 435 | static void register_to_network(RDMAContext *rdma, RDMARegister *reg) |
2da776db | 436 | { |
b12f7777 DDAG |
437 | RDMALocalBlock *local_block; |
438 | local_block = &rdma->local_ram_blocks.block[reg->current_index]; | |
439 | ||
440 | if (local_block->is_ram_block) { | |
441 | /* | |
442 | * current_addr as passed in is an address in the local ram_addr_t | |
443 | * space, we need to translate this for the destination | |
444 | */ | |
445 | reg->key.current_addr -= local_block->offset; | |
446 | reg->key.current_addr += rdma->dest_blocks[reg->current_index].offset; | |
447 | } | |
2da776db MH |
448 | reg->key.current_addr = htonll(reg->key.current_addr); |
449 | reg->current_index = htonl(reg->current_index); | |
450 | reg->chunks = htonll(reg->chunks); | |
451 | } | |
452 | ||
453 | static void network_to_register(RDMARegister *reg) | |
454 | { | |
455 | reg->key.current_addr = ntohll(reg->key.current_addr); | |
456 | reg->current_index = ntohl(reg->current_index); | |
457 | reg->chunks = ntohll(reg->chunks); | |
458 | } | |
459 | ||
460 | typedef struct QEMU_PACKED { | |
461 | uint32_t value; /* if zero, we will madvise() */ | |
462 | uint32_t block_idx; /* which ram block index */ | |
b12f7777 | 463 | uint64_t offset; /* Address in remote ram_addr_t space */ |
2da776db MH |
464 | uint64_t length; /* length of the chunk */ |
465 | } RDMACompress; | |
466 | ||
b12f7777 | 467 | static void compress_to_network(RDMAContext *rdma, RDMACompress *comp) |
2da776db MH |
468 | { |
469 | comp->value = htonl(comp->value); | |
b12f7777 DDAG |
470 | /* |
471 | * comp->offset as passed in is an address in the local ram_addr_t | |
472 | * space, we need to translate this for the destination | |
473 | */ | |
474 | comp->offset -= rdma->local_ram_blocks.block[comp->block_idx].offset; | |
475 | comp->offset += rdma->dest_blocks[comp->block_idx].offset; | |
2da776db MH |
476 | comp->block_idx = htonl(comp->block_idx); |
477 | comp->offset = htonll(comp->offset); | |
478 | comp->length = htonll(comp->length); | |
479 | } | |
480 | ||
481 | static void network_to_compress(RDMACompress *comp) | |
482 | { | |
483 | comp->value = ntohl(comp->value); | |
484 | comp->block_idx = ntohl(comp->block_idx); | |
485 | comp->offset = ntohll(comp->offset); | |
486 | comp->length = ntohll(comp->length); | |
487 | } | |
488 | ||
489 | /* | |
490 | * The result of the dest's memory registration produces an "rkey" | |
491 | * which the source VM must reference in order to perform | |
492 | * the RDMA operation. | |
493 | */ | |
494 | typedef struct QEMU_PACKED { | |
495 | uint32_t rkey; | |
496 | uint32_t padding; | |
497 | uint64_t host_addr; | |
498 | } RDMARegisterResult; | |
499 | ||
500 | static void result_to_network(RDMARegisterResult *result) | |
501 | { | |
502 | result->rkey = htonl(result->rkey); | |
503 | result->host_addr = htonll(result->host_addr); | |
504 | }; | |
505 | ||
506 | static void network_to_result(RDMARegisterResult *result) | |
507 | { | |
508 | result->rkey = ntohl(result->rkey); | |
509 | result->host_addr = ntohll(result->host_addr); | |
510 | }; | |
511 | ||
512 | const char *print_wrid(int wrid); | |
513 | static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, | |
514 | uint8_t *data, RDMAControlHeader *resp, | |
515 | int *resp_idx, | |
516 | int (*callback)(RDMAContext *rdma)); | |
517 | ||
dd286ed7 IY |
518 | static inline uint64_t ram_chunk_index(const uint8_t *start, |
519 | const uint8_t *host) | |
2da776db MH |
520 | { |
521 | return ((uintptr_t) host - (uintptr_t) start) >> RDMA_REG_CHUNK_SHIFT; | |
522 | } | |
523 | ||
dd286ed7 | 524 | static inline uint8_t *ram_chunk_start(const RDMALocalBlock *rdma_ram_block, |
2da776db MH |
525 | uint64_t i) |
526 | { | |
fbce8c25 SW |
527 | return (uint8_t *)(uintptr_t)(rdma_ram_block->local_host_addr + |
528 | (i << RDMA_REG_CHUNK_SHIFT)); | |
2da776db MH |
529 | } |
530 | ||
dd286ed7 IY |
531 | static inline uint8_t *ram_chunk_end(const RDMALocalBlock *rdma_ram_block, |
532 | uint64_t i) | |
2da776db MH |
533 | { |
534 | uint8_t *result = ram_chunk_start(rdma_ram_block, i) + | |
535 | (1UL << RDMA_REG_CHUNK_SHIFT); | |
536 | ||
537 | if (result > (rdma_ram_block->local_host_addr + rdma_ram_block->length)) { | |
538 | result = rdma_ram_block->local_host_addr + rdma_ram_block->length; | |
539 | } | |
540 | ||
541 | return result; | |
542 | } | |
543 | ||
4fb5364b DDAG |
544 | static int rdma_add_block(RDMAContext *rdma, const char *block_name, |
545 | void *host_addr, | |
2da776db MH |
546 | ram_addr_t block_offset, uint64_t length) |
547 | { | |
548 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
760ff4be | 549 | RDMALocalBlock *block; |
2da776db MH |
550 | RDMALocalBlock *old = local->block; |
551 | ||
97f3ad35 | 552 | local->block = g_new0(RDMALocalBlock, local->nb_blocks + 1); |
2da776db MH |
553 | |
554 | if (local->nb_blocks) { | |
555 | int x; | |
556 | ||
760ff4be DDAG |
557 | if (rdma->blockmap) { |
558 | for (x = 0; x < local->nb_blocks; x++) { | |
559 | g_hash_table_remove(rdma->blockmap, | |
560 | (void *)(uintptr_t)old[x].offset); | |
561 | g_hash_table_insert(rdma->blockmap, | |
562 | (void *)(uintptr_t)old[x].offset, | |
563 | &local->block[x]); | |
564 | } | |
2da776db MH |
565 | } |
566 | memcpy(local->block, old, sizeof(RDMALocalBlock) * local->nb_blocks); | |
567 | g_free(old); | |
568 | } | |
569 | ||
570 | block = &local->block[local->nb_blocks]; | |
571 | ||
4fb5364b | 572 | block->block_name = g_strdup(block_name); |
2da776db MH |
573 | block->local_host_addr = host_addr; |
574 | block->offset = block_offset; | |
575 | block->length = length; | |
576 | block->index = local->nb_blocks; | |
e4d63320 | 577 | block->src_index = ~0U; /* Filled in by the receipt of the block list */ |
2da776db MH |
578 | block->nb_chunks = ram_chunk_index(host_addr, host_addr + length) + 1UL; |
579 | block->transit_bitmap = bitmap_new(block->nb_chunks); | |
580 | bitmap_clear(block->transit_bitmap, 0, block->nb_chunks); | |
581 | block->unregister_bitmap = bitmap_new(block->nb_chunks); | |
582 | bitmap_clear(block->unregister_bitmap, 0, block->nb_chunks); | |
97f3ad35 | 583 | block->remote_keys = g_new0(uint32_t, block->nb_chunks); |
2da776db MH |
584 | |
585 | block->is_ram_block = local->init ? false : true; | |
586 | ||
760ff4be | 587 | if (rdma->blockmap) { |
80e60c6e | 588 | g_hash_table_insert(rdma->blockmap, (void *)(uintptr_t)block_offset, block); |
760ff4be | 589 | } |
2da776db | 590 | |
4fb5364b DDAG |
591 | trace_rdma_add_block(block_name, local->nb_blocks, |
592 | (uintptr_t) block->local_host_addr, | |
ba795761 | 593 | block->offset, block->length, |
fbce8c25 | 594 | (uintptr_t) (block->local_host_addr + block->length), |
ba795761 DDAG |
595 | BITS_TO_LONGS(block->nb_chunks) * |
596 | sizeof(unsigned long) * 8, | |
597 | block->nb_chunks); | |
2da776db MH |
598 | |
599 | local->nb_blocks++; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | /* | |
605 | * Memory regions need to be registered with the device and queue pairs setup | |
606 | * in advanced before the migration starts. This tells us where the RAM blocks | |
607 | * are so that we can register them individually. | |
608 | */ | |
e3807054 | 609 | static int qemu_rdma_init_one_block(const char *block_name, void *host_addr, |
2da776db MH |
610 | ram_addr_t block_offset, ram_addr_t length, void *opaque) |
611 | { | |
4fb5364b | 612 | return rdma_add_block(opaque, block_name, host_addr, block_offset, length); |
2da776db MH |
613 | } |
614 | ||
615 | /* | |
616 | * Identify the RAMBlocks and their quantity. They will be references to | |
617 | * identify chunk boundaries inside each RAMBlock and also be referenced | |
618 | * during dynamic page registration. | |
619 | */ | |
620 | static int qemu_rdma_init_ram_blocks(RDMAContext *rdma) | |
621 | { | |
622 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
623 | ||
624 | assert(rdma->blockmap == NULL); | |
2da776db MH |
625 | memset(local, 0, sizeof *local); |
626 | qemu_ram_foreach_block(qemu_rdma_init_one_block, rdma); | |
733252de | 627 | trace_qemu_rdma_init_ram_blocks(local->nb_blocks); |
97f3ad35 MA |
628 | rdma->dest_blocks = g_new0(RDMADestBlock, |
629 | rdma->local_ram_blocks.nb_blocks); | |
2da776db MH |
630 | local->init = true; |
631 | return 0; | |
632 | } | |
633 | ||
03fcab38 DDAG |
634 | /* |
635 | * Note: If used outside of cleanup, the caller must ensure that the destination | |
636 | * block structures are also updated | |
637 | */ | |
638 | static int rdma_delete_block(RDMAContext *rdma, RDMALocalBlock *block) | |
2da776db MH |
639 | { |
640 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
2da776db MH |
641 | RDMALocalBlock *old = local->block; |
642 | int x; | |
643 | ||
03fcab38 DDAG |
644 | if (rdma->blockmap) { |
645 | g_hash_table_remove(rdma->blockmap, (void *)(uintptr_t)block->offset); | |
646 | } | |
2da776db MH |
647 | if (block->pmr) { |
648 | int j; | |
649 | ||
650 | for (j = 0; j < block->nb_chunks; j++) { | |
651 | if (!block->pmr[j]) { | |
652 | continue; | |
653 | } | |
654 | ibv_dereg_mr(block->pmr[j]); | |
655 | rdma->total_registrations--; | |
656 | } | |
657 | g_free(block->pmr); | |
658 | block->pmr = NULL; | |
659 | } | |
660 | ||
661 | if (block->mr) { | |
662 | ibv_dereg_mr(block->mr); | |
663 | rdma->total_registrations--; | |
664 | block->mr = NULL; | |
665 | } | |
666 | ||
667 | g_free(block->transit_bitmap); | |
668 | block->transit_bitmap = NULL; | |
669 | ||
670 | g_free(block->unregister_bitmap); | |
671 | block->unregister_bitmap = NULL; | |
672 | ||
673 | g_free(block->remote_keys); | |
674 | block->remote_keys = NULL; | |
675 | ||
4fb5364b DDAG |
676 | g_free(block->block_name); |
677 | block->block_name = NULL; | |
678 | ||
03fcab38 DDAG |
679 | if (rdma->blockmap) { |
680 | for (x = 0; x < local->nb_blocks; x++) { | |
681 | g_hash_table_remove(rdma->blockmap, | |
682 | (void *)(uintptr_t)old[x].offset); | |
683 | } | |
2da776db MH |
684 | } |
685 | ||
686 | if (local->nb_blocks > 1) { | |
687 | ||
97f3ad35 | 688 | local->block = g_new0(RDMALocalBlock, local->nb_blocks - 1); |
2da776db MH |
689 | |
690 | if (block->index) { | |
691 | memcpy(local->block, old, sizeof(RDMALocalBlock) * block->index); | |
692 | } | |
693 | ||
694 | if (block->index < (local->nb_blocks - 1)) { | |
695 | memcpy(local->block + block->index, old + (block->index + 1), | |
696 | sizeof(RDMALocalBlock) * | |
697 | (local->nb_blocks - (block->index + 1))); | |
698 | } | |
699 | } else { | |
700 | assert(block == local->block); | |
701 | local->block = NULL; | |
702 | } | |
703 | ||
03fcab38 | 704 | trace_rdma_delete_block(block, (uintptr_t)block->local_host_addr, |
733252de | 705 | block->offset, block->length, |
fbce8c25 | 706 | (uintptr_t)(block->local_host_addr + block->length), |
733252de DDAG |
707 | BITS_TO_LONGS(block->nb_chunks) * |
708 | sizeof(unsigned long) * 8, block->nb_chunks); | |
2da776db MH |
709 | |
710 | g_free(old); | |
711 | ||
712 | local->nb_blocks--; | |
713 | ||
03fcab38 | 714 | if (local->nb_blocks && rdma->blockmap) { |
2da776db | 715 | for (x = 0; x < local->nb_blocks; x++) { |
fbce8c25 SW |
716 | g_hash_table_insert(rdma->blockmap, |
717 | (void *)(uintptr_t)local->block[x].offset, | |
718 | &local->block[x]); | |
2da776db MH |
719 | } |
720 | } | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
725 | /* | |
726 | * Put in the log file which RDMA device was opened and the details | |
727 | * associated with that device. | |
728 | */ | |
729 | static void qemu_rdma_dump_id(const char *who, struct ibv_context *verbs) | |
730 | { | |
7fc5b13f MH |
731 | struct ibv_port_attr port; |
732 | ||
733 | if (ibv_query_port(verbs, 1, &port)) { | |
733252de | 734 | error_report("Failed to query port information"); |
7fc5b13f MH |
735 | return; |
736 | } | |
737 | ||
2da776db MH |
738 | printf("%s RDMA Device opened: kernel name %s " |
739 | "uverbs device name %s, " | |
7fc5b13f MH |
740 | "infiniband_verbs class device path %s, " |
741 | "infiniband class device path %s, " | |
742 | "transport: (%d) %s\n", | |
2da776db MH |
743 | who, |
744 | verbs->device->name, | |
745 | verbs->device->dev_name, | |
746 | verbs->device->dev_path, | |
7fc5b13f MH |
747 | verbs->device->ibdev_path, |
748 | port.link_layer, | |
749 | (port.link_layer == IBV_LINK_LAYER_INFINIBAND) ? "Infiniband" : | |
02942db7 | 750 | ((port.link_layer == IBV_LINK_LAYER_ETHERNET) |
7fc5b13f | 751 | ? "Ethernet" : "Unknown")); |
2da776db MH |
752 | } |
753 | ||
754 | /* | |
755 | * Put in the log file the RDMA gid addressing information, | |
756 | * useful for folks who have trouble understanding the | |
757 | * RDMA device hierarchy in the kernel. | |
758 | */ | |
759 | static void qemu_rdma_dump_gid(const char *who, struct rdma_cm_id *id) | |
760 | { | |
761 | char sgid[33]; | |
762 | char dgid[33]; | |
763 | inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.sgid, sgid, sizeof sgid); | |
764 | inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.dgid, dgid, sizeof dgid); | |
733252de | 765 | trace_qemu_rdma_dump_gid(who, sgid, dgid); |
2da776db MH |
766 | } |
767 | ||
7fc5b13f MH |
768 | /* |
769 | * As of now, IPv6 over RoCE / iWARP is not supported by linux. | |
770 | * We will try the next addrinfo struct, and fail if there are | |
771 | * no other valid addresses to bind against. | |
772 | * | |
773 | * If user is listening on '[::]', then we will not have a opened a device | |
774 | * yet and have no way of verifying if the device is RoCE or not. | |
775 | * | |
776 | * In this case, the source VM will throw an error for ALL types of | |
777 | * connections (both IPv4 and IPv6) if the destination machine does not have | |
778 | * a regular infiniband network available for use. | |
779 | * | |
4c293dc6 | 780 | * The only way to guarantee that an error is thrown for broken kernels is |
7fc5b13f MH |
781 | * for the management software to choose a *specific* interface at bind time |
782 | * and validate what time of hardware it is. | |
783 | * | |
784 | * Unfortunately, this puts the user in a fix: | |
02942db7 | 785 | * |
7fc5b13f MH |
786 | * If the source VM connects with an IPv4 address without knowing that the |
787 | * destination has bound to '[::]' the migration will unconditionally fail | |
b6af0975 | 788 | * unless the management software is explicitly listening on the IPv4 |
7fc5b13f MH |
789 | * address while using a RoCE-based device. |
790 | * | |
791 | * If the source VM connects with an IPv6 address, then we're OK because we can | |
792 | * throw an error on the source (and similarly on the destination). | |
02942db7 | 793 | * |
7fc5b13f MH |
794 | * But in mixed environments, this will be broken for a while until it is fixed |
795 | * inside linux. | |
796 | * | |
797 | * We do provide a *tiny* bit of help in this function: We can list all of the | |
798 | * devices in the system and check to see if all the devices are RoCE or | |
02942db7 | 799 | * Infiniband. |
7fc5b13f MH |
800 | * |
801 | * If we detect that we have a *pure* RoCE environment, then we can safely | |
4c293dc6 | 802 | * thrown an error even if the management software has specified '[::]' as the |
7fc5b13f MH |
803 | * bind address. |
804 | * | |
805 | * However, if there is are multiple hetergeneous devices, then we cannot make | |
806 | * this assumption and the user just has to be sure they know what they are | |
807 | * doing. | |
808 | * | |
809 | * Patches are being reviewed on linux-rdma. | |
810 | */ | |
811 | static int qemu_rdma_broken_ipv6_kernel(Error **errp, struct ibv_context *verbs) | |
812 | { | |
813 | struct ibv_port_attr port_attr; | |
814 | ||
815 | /* This bug only exists in linux, to our knowledge. */ | |
816 | #ifdef CONFIG_LINUX | |
817 | ||
02942db7 | 818 | /* |
7fc5b13f | 819 | * Verbs are only NULL if management has bound to '[::]'. |
02942db7 | 820 | * |
7fc5b13f MH |
821 | * Let's iterate through all the devices and see if there any pure IB |
822 | * devices (non-ethernet). | |
02942db7 | 823 | * |
7fc5b13f | 824 | * If not, then we can safely proceed with the migration. |
4c293dc6 | 825 | * Otherwise, there are no guarantees until the bug is fixed in linux. |
7fc5b13f MH |
826 | */ |
827 | if (!verbs) { | |
02942db7 | 828 | int num_devices, x; |
7fc5b13f MH |
829 | struct ibv_device ** dev_list = ibv_get_device_list(&num_devices); |
830 | bool roce_found = false; | |
831 | bool ib_found = false; | |
832 | ||
833 | for (x = 0; x < num_devices; x++) { | |
834 | verbs = ibv_open_device(dev_list[x]); | |
5b61d575 PR |
835 | if (!verbs) { |
836 | if (errno == EPERM) { | |
837 | continue; | |
838 | } else { | |
839 | return -EINVAL; | |
840 | } | |
841 | } | |
7fc5b13f MH |
842 | |
843 | if (ibv_query_port(verbs, 1, &port_attr)) { | |
844 | ibv_close_device(verbs); | |
845 | ERROR(errp, "Could not query initial IB port"); | |
846 | return -EINVAL; | |
847 | } | |
848 | ||
849 | if (port_attr.link_layer == IBV_LINK_LAYER_INFINIBAND) { | |
850 | ib_found = true; | |
851 | } else if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) { | |
852 | roce_found = true; | |
853 | } | |
854 | ||
855 | ibv_close_device(verbs); | |
856 | ||
857 | } | |
858 | ||
859 | if (roce_found) { | |
860 | if (ib_found) { | |
861 | fprintf(stderr, "WARN: migrations may fail:" | |
862 | " IPv6 over RoCE / iWARP in linux" | |
863 | " is broken. But since you appear to have a" | |
864 | " mixed RoCE / IB environment, be sure to only" | |
865 | " migrate over the IB fabric until the kernel " | |
866 | " fixes the bug.\n"); | |
867 | } else { | |
868 | ERROR(errp, "You only have RoCE / iWARP devices in your systems" | |
869 | " and your management software has specified '[::]'" | |
870 | ", but IPv6 over RoCE / iWARP is not supported in Linux."); | |
871 | return -ENONET; | |
872 | } | |
873 | } | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
878 | /* | |
879 | * If we have a verbs context, that means that some other than '[::]' was | |
02942db7 SW |
880 | * used by the management software for binding. In which case we can |
881 | * actually warn the user about a potentially broken kernel. | |
7fc5b13f MH |
882 | */ |
883 | ||
884 | /* IB ports start with 1, not 0 */ | |
885 | if (ibv_query_port(verbs, 1, &port_attr)) { | |
886 | ERROR(errp, "Could not query initial IB port"); | |
887 | return -EINVAL; | |
888 | } | |
889 | ||
890 | if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) { | |
891 | ERROR(errp, "Linux kernel's RoCE / iWARP does not support IPv6 " | |
892 | "(but patches on linux-rdma in progress)"); | |
893 | return -ENONET; | |
894 | } | |
895 | ||
896 | #endif | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
2da776db MH |
901 | /* |
902 | * Figure out which RDMA device corresponds to the requested IP hostname | |
903 | * Also create the initial connection manager identifiers for opening | |
904 | * the connection. | |
905 | */ | |
906 | static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp) | |
907 | { | |
908 | int ret; | |
7fc5b13f | 909 | struct rdma_addrinfo *res; |
2da776db MH |
910 | char port_str[16]; |
911 | struct rdma_cm_event *cm_event; | |
912 | char ip[40] = "unknown"; | |
7fc5b13f | 913 | struct rdma_addrinfo *e; |
2da776db MH |
914 | |
915 | if (rdma->host == NULL || !strcmp(rdma->host, "")) { | |
66988941 | 916 | ERROR(errp, "RDMA hostname has not been set"); |
7fc5b13f | 917 | return -EINVAL; |
2da776db MH |
918 | } |
919 | ||
920 | /* create CM channel */ | |
921 | rdma->channel = rdma_create_event_channel(); | |
922 | if (!rdma->channel) { | |
66988941 | 923 | ERROR(errp, "could not create CM channel"); |
7fc5b13f | 924 | return -EINVAL; |
2da776db MH |
925 | } |
926 | ||
927 | /* create CM id */ | |
928 | ret = rdma_create_id(rdma->channel, &rdma->cm_id, NULL, RDMA_PS_TCP); | |
929 | if (ret) { | |
66988941 | 930 | ERROR(errp, "could not create channel id"); |
2da776db MH |
931 | goto err_resolve_create_id; |
932 | } | |
933 | ||
934 | snprintf(port_str, 16, "%d", rdma->port); | |
935 | port_str[15] = '\0'; | |
936 | ||
7fc5b13f | 937 | ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res); |
2da776db | 938 | if (ret < 0) { |
7fc5b13f | 939 | ERROR(errp, "could not rdma_getaddrinfo address %s", rdma->host); |
2da776db MH |
940 | goto err_resolve_get_addr; |
941 | } | |
942 | ||
6470215b MH |
943 | for (e = res; e != NULL; e = e->ai_next) { |
944 | inet_ntop(e->ai_family, | |
7fc5b13f | 945 | &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip); |
733252de | 946 | trace_qemu_rdma_resolve_host_trying(rdma->host, ip); |
2da776db | 947 | |
7fc5b13f | 948 | ret = rdma_resolve_addr(rdma->cm_id, NULL, e->ai_dst_addr, |
6470215b MH |
949 | RDMA_RESOLVE_TIMEOUT_MS); |
950 | if (!ret) { | |
c89aa2f1 MH |
951 | if (e->ai_family == AF_INET6) { |
952 | ret = qemu_rdma_broken_ipv6_kernel(errp, rdma->cm_id->verbs); | |
953 | if (ret) { | |
954 | continue; | |
955 | } | |
7fc5b13f | 956 | } |
6470215b MH |
957 | goto route; |
958 | } | |
2da776db MH |
959 | } |
960 | ||
6470215b MH |
961 | ERROR(errp, "could not resolve address %s", rdma->host); |
962 | goto err_resolve_get_addr; | |
963 | ||
964 | route: | |
2da776db MH |
965 | qemu_rdma_dump_gid("source_resolve_addr", rdma->cm_id); |
966 | ||
967 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
968 | if (ret) { | |
66988941 | 969 | ERROR(errp, "could not perform event_addr_resolved"); |
2da776db MH |
970 | goto err_resolve_get_addr; |
971 | } | |
972 | ||
973 | if (cm_event->event != RDMA_CM_EVENT_ADDR_RESOLVED) { | |
66988941 | 974 | ERROR(errp, "result not equal to event_addr_resolved %s", |
2da776db MH |
975 | rdma_event_str(cm_event->event)); |
976 | perror("rdma_resolve_addr"); | |
2a934347 | 977 | rdma_ack_cm_event(cm_event); |
7fc5b13f | 978 | ret = -EINVAL; |
2da776db MH |
979 | goto err_resolve_get_addr; |
980 | } | |
981 | rdma_ack_cm_event(cm_event); | |
982 | ||
983 | /* resolve route */ | |
984 | ret = rdma_resolve_route(rdma->cm_id, RDMA_RESOLVE_TIMEOUT_MS); | |
985 | if (ret) { | |
66988941 | 986 | ERROR(errp, "could not resolve rdma route"); |
2da776db MH |
987 | goto err_resolve_get_addr; |
988 | } | |
989 | ||
990 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
991 | if (ret) { | |
66988941 | 992 | ERROR(errp, "could not perform event_route_resolved"); |
2da776db MH |
993 | goto err_resolve_get_addr; |
994 | } | |
995 | if (cm_event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) { | |
66988941 | 996 | ERROR(errp, "result not equal to event_route_resolved: %s", |
2da776db MH |
997 | rdma_event_str(cm_event->event)); |
998 | rdma_ack_cm_event(cm_event); | |
7fc5b13f | 999 | ret = -EINVAL; |
2da776db MH |
1000 | goto err_resolve_get_addr; |
1001 | } | |
1002 | rdma_ack_cm_event(cm_event); | |
1003 | rdma->verbs = rdma->cm_id->verbs; | |
1004 | qemu_rdma_dump_id("source_resolve_host", rdma->cm_id->verbs); | |
1005 | qemu_rdma_dump_gid("source_resolve_host", rdma->cm_id); | |
1006 | return 0; | |
1007 | ||
1008 | err_resolve_get_addr: | |
1009 | rdma_destroy_id(rdma->cm_id); | |
1010 | rdma->cm_id = NULL; | |
1011 | err_resolve_create_id: | |
1012 | rdma_destroy_event_channel(rdma->channel); | |
1013 | rdma->channel = NULL; | |
7fc5b13f | 1014 | return ret; |
2da776db MH |
1015 | } |
1016 | ||
1017 | /* | |
1018 | * Create protection domain and completion queues | |
1019 | */ | |
1020 | static int qemu_rdma_alloc_pd_cq(RDMAContext *rdma) | |
1021 | { | |
1022 | /* allocate pd */ | |
1023 | rdma->pd = ibv_alloc_pd(rdma->verbs); | |
1024 | if (!rdma->pd) { | |
733252de | 1025 | error_report("failed to allocate protection domain"); |
2da776db MH |
1026 | return -1; |
1027 | } | |
1028 | ||
1029 | /* create completion channel */ | |
1030 | rdma->comp_channel = ibv_create_comp_channel(rdma->verbs); | |
1031 | if (!rdma->comp_channel) { | |
733252de | 1032 | error_report("failed to allocate completion channel"); |
2da776db MH |
1033 | goto err_alloc_pd_cq; |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Completion queue can be filled by both read and write work requests, | |
1038 | * so must reflect the sum of both possible queue sizes. | |
1039 | */ | |
1040 | rdma->cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3), | |
1041 | NULL, rdma->comp_channel, 0); | |
1042 | if (!rdma->cq) { | |
733252de | 1043 | error_report("failed to allocate completion queue"); |
2da776db MH |
1044 | goto err_alloc_pd_cq; |
1045 | } | |
1046 | ||
1047 | return 0; | |
1048 | ||
1049 | err_alloc_pd_cq: | |
1050 | if (rdma->pd) { | |
1051 | ibv_dealloc_pd(rdma->pd); | |
1052 | } | |
1053 | if (rdma->comp_channel) { | |
1054 | ibv_destroy_comp_channel(rdma->comp_channel); | |
1055 | } | |
1056 | rdma->pd = NULL; | |
1057 | rdma->comp_channel = NULL; | |
1058 | return -1; | |
1059 | ||
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Create queue pairs. | |
1064 | */ | |
1065 | static int qemu_rdma_alloc_qp(RDMAContext *rdma) | |
1066 | { | |
1067 | struct ibv_qp_init_attr attr = { 0 }; | |
1068 | int ret; | |
1069 | ||
1070 | attr.cap.max_send_wr = RDMA_SIGNALED_SEND_MAX; | |
1071 | attr.cap.max_recv_wr = 3; | |
1072 | attr.cap.max_send_sge = 1; | |
1073 | attr.cap.max_recv_sge = 1; | |
1074 | attr.send_cq = rdma->cq; | |
1075 | attr.recv_cq = rdma->cq; | |
1076 | attr.qp_type = IBV_QPT_RC; | |
1077 | ||
1078 | ret = rdma_create_qp(rdma->cm_id, rdma->pd, &attr); | |
1079 | if (ret) { | |
1080 | return -1; | |
1081 | } | |
1082 | ||
1083 | rdma->qp = rdma->cm_id->qp; | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | static int qemu_rdma_reg_whole_ram_blocks(RDMAContext *rdma) | |
1088 | { | |
1089 | int i; | |
1090 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
1091 | ||
1092 | for (i = 0; i < local->nb_blocks; i++) { | |
1093 | local->block[i].mr = | |
1094 | ibv_reg_mr(rdma->pd, | |
1095 | local->block[i].local_host_addr, | |
1096 | local->block[i].length, | |
1097 | IBV_ACCESS_LOCAL_WRITE | | |
1098 | IBV_ACCESS_REMOTE_WRITE | |
1099 | ); | |
1100 | if (!local->block[i].mr) { | |
1101 | perror("Failed to register local dest ram block!\n"); | |
1102 | break; | |
1103 | } | |
1104 | rdma->total_registrations++; | |
1105 | } | |
1106 | ||
1107 | if (i >= local->nb_blocks) { | |
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | for (i--; i >= 0; i--) { | |
1112 | ibv_dereg_mr(local->block[i].mr); | |
1113 | rdma->total_registrations--; | |
1114 | } | |
1115 | ||
1116 | return -1; | |
1117 | ||
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * Find the ram block that corresponds to the page requested to be | |
1122 | * transmitted by QEMU. | |
1123 | * | |
1124 | * Once the block is found, also identify which 'chunk' within that | |
1125 | * block that the page belongs to. | |
1126 | * | |
1127 | * This search cannot fail or the migration will fail. | |
1128 | */ | |
1129 | static int qemu_rdma_search_ram_block(RDMAContext *rdma, | |
fbce8c25 | 1130 | uintptr_t block_offset, |
2da776db MH |
1131 | uint64_t offset, |
1132 | uint64_t length, | |
1133 | uint64_t *block_index, | |
1134 | uint64_t *chunk_index) | |
1135 | { | |
1136 | uint64_t current_addr = block_offset + offset; | |
1137 | RDMALocalBlock *block = g_hash_table_lookup(rdma->blockmap, | |
1138 | (void *) block_offset); | |
1139 | assert(block); | |
1140 | assert(current_addr >= block->offset); | |
1141 | assert((current_addr + length) <= (block->offset + block->length)); | |
1142 | ||
1143 | *block_index = block->index; | |
1144 | *chunk_index = ram_chunk_index(block->local_host_addr, | |
1145 | block->local_host_addr + (current_addr - block->offset)); | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | /* | |
1151 | * Register a chunk with IB. If the chunk was already registered | |
1152 | * previously, then skip. | |
1153 | * | |
1154 | * Also return the keys associated with the registration needed | |
1155 | * to perform the actual RDMA operation. | |
1156 | */ | |
1157 | static int qemu_rdma_register_and_get_keys(RDMAContext *rdma, | |
3ac040c0 | 1158 | RDMALocalBlock *block, uintptr_t host_addr, |
2da776db MH |
1159 | uint32_t *lkey, uint32_t *rkey, int chunk, |
1160 | uint8_t *chunk_start, uint8_t *chunk_end) | |
1161 | { | |
1162 | if (block->mr) { | |
1163 | if (lkey) { | |
1164 | *lkey = block->mr->lkey; | |
1165 | } | |
1166 | if (rkey) { | |
1167 | *rkey = block->mr->rkey; | |
1168 | } | |
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | /* allocate memory to store chunk MRs */ | |
1173 | if (!block->pmr) { | |
97f3ad35 | 1174 | block->pmr = g_new0(struct ibv_mr *, block->nb_chunks); |
2da776db MH |
1175 | } |
1176 | ||
1177 | /* | |
1178 | * If 'rkey', then we're the destination, so grant access to the source. | |
1179 | * | |
1180 | * If 'lkey', then we're the source VM, so grant access only to ourselves. | |
1181 | */ | |
1182 | if (!block->pmr[chunk]) { | |
1183 | uint64_t len = chunk_end - chunk_start; | |
1184 | ||
733252de | 1185 | trace_qemu_rdma_register_and_get_keys(len, chunk_start); |
2da776db MH |
1186 | |
1187 | block->pmr[chunk] = ibv_reg_mr(rdma->pd, | |
1188 | chunk_start, len, | |
1189 | (rkey ? (IBV_ACCESS_LOCAL_WRITE | | |
1190 | IBV_ACCESS_REMOTE_WRITE) : 0)); | |
1191 | ||
1192 | if (!block->pmr[chunk]) { | |
1193 | perror("Failed to register chunk!"); | |
1194 | fprintf(stderr, "Chunk details: block: %d chunk index %d" | |
3ac040c0 SW |
1195 | " start %" PRIuPTR " end %" PRIuPTR |
1196 | " host %" PRIuPTR | |
1197 | " local %" PRIuPTR " registrations: %d\n", | |
1198 | block->index, chunk, (uintptr_t)chunk_start, | |
1199 | (uintptr_t)chunk_end, host_addr, | |
1200 | (uintptr_t)block->local_host_addr, | |
2da776db MH |
1201 | rdma->total_registrations); |
1202 | return -1; | |
1203 | } | |
1204 | rdma->total_registrations++; | |
1205 | } | |
1206 | ||
1207 | if (lkey) { | |
1208 | *lkey = block->pmr[chunk]->lkey; | |
1209 | } | |
1210 | if (rkey) { | |
1211 | *rkey = block->pmr[chunk]->rkey; | |
1212 | } | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Register (at connection time) the memory used for control | |
1218 | * channel messages. | |
1219 | */ | |
1220 | static int qemu_rdma_reg_control(RDMAContext *rdma, int idx) | |
1221 | { | |
1222 | rdma->wr_data[idx].control_mr = ibv_reg_mr(rdma->pd, | |
1223 | rdma->wr_data[idx].control, RDMA_CONTROL_MAX_BUFFER, | |
1224 | IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE); | |
1225 | if (rdma->wr_data[idx].control_mr) { | |
1226 | rdma->total_registrations++; | |
1227 | return 0; | |
1228 | } | |
733252de | 1229 | error_report("qemu_rdma_reg_control failed"); |
2da776db MH |
1230 | return -1; |
1231 | } | |
1232 | ||
1233 | const char *print_wrid(int wrid) | |
1234 | { | |
1235 | if (wrid >= RDMA_WRID_RECV_CONTROL) { | |
1236 | return wrid_desc[RDMA_WRID_RECV_CONTROL]; | |
1237 | } | |
1238 | return wrid_desc[wrid]; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * RDMA requires memory registration (mlock/pinning), but this is not good for | |
1243 | * overcommitment. | |
1244 | * | |
1245 | * In preparation for the future where LRU information or workload-specific | |
1246 | * writable writable working set memory access behavior is available to QEMU | |
1247 | * it would be nice to have in place the ability to UN-register/UN-pin | |
1248 | * particular memory regions from the RDMA hardware when it is determine that | |
1249 | * those regions of memory will likely not be accessed again in the near future. | |
1250 | * | |
1251 | * While we do not yet have such information right now, the following | |
1252 | * compile-time option allows us to perform a non-optimized version of this | |
1253 | * behavior. | |
1254 | * | |
1255 | * By uncommenting this option, you will cause *all* RDMA transfers to be | |
1256 | * unregistered immediately after the transfer completes on both sides of the | |
1257 | * connection. This has no effect in 'rdma-pin-all' mode, only regular mode. | |
1258 | * | |
1259 | * This will have a terrible impact on migration performance, so until future | |
1260 | * workload information or LRU information is available, do not attempt to use | |
1261 | * this feature except for basic testing. | |
1262 | */ | |
1263 | //#define RDMA_UNREGISTRATION_EXAMPLE | |
1264 | ||
1265 | /* | |
1266 | * Perform a non-optimized memory unregistration after every transfer | |
24ec68ef | 1267 | * for demonstration purposes, only if pin-all is not requested. |
2da776db MH |
1268 | * |
1269 | * Potential optimizations: | |
1270 | * 1. Start a new thread to run this function continuously | |
1271 | - for bit clearing | |
1272 | - and for receipt of unregister messages | |
1273 | * 2. Use an LRU. | |
1274 | * 3. Use workload hints. | |
1275 | */ | |
1276 | static int qemu_rdma_unregister_waiting(RDMAContext *rdma) | |
1277 | { | |
1278 | while (rdma->unregistrations[rdma->unregister_current]) { | |
1279 | int ret; | |
1280 | uint64_t wr_id = rdma->unregistrations[rdma->unregister_current]; | |
1281 | uint64_t chunk = | |
1282 | (wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; | |
1283 | uint64_t index = | |
1284 | (wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; | |
1285 | RDMALocalBlock *block = | |
1286 | &(rdma->local_ram_blocks.block[index]); | |
1287 | RDMARegister reg = { .current_index = index }; | |
1288 | RDMAControlHeader resp = { .type = RDMA_CONTROL_UNREGISTER_FINISHED, | |
1289 | }; | |
1290 | RDMAControlHeader head = { .len = sizeof(RDMARegister), | |
1291 | .type = RDMA_CONTROL_UNREGISTER_REQUEST, | |
1292 | .repeat = 1, | |
1293 | }; | |
1294 | ||
733252de DDAG |
1295 | trace_qemu_rdma_unregister_waiting_proc(chunk, |
1296 | rdma->unregister_current); | |
2da776db MH |
1297 | |
1298 | rdma->unregistrations[rdma->unregister_current] = 0; | |
1299 | rdma->unregister_current++; | |
1300 | ||
1301 | if (rdma->unregister_current == RDMA_SIGNALED_SEND_MAX) { | |
1302 | rdma->unregister_current = 0; | |
1303 | } | |
1304 | ||
1305 | ||
1306 | /* | |
1307 | * Unregistration is speculative (because migration is single-threaded | |
1308 | * and we cannot break the protocol's inifinband message ordering). | |
1309 | * Thus, if the memory is currently being used for transmission, | |
1310 | * then abort the attempt to unregister and try again | |
1311 | * later the next time a completion is received for this memory. | |
1312 | */ | |
1313 | clear_bit(chunk, block->unregister_bitmap); | |
1314 | ||
1315 | if (test_bit(chunk, block->transit_bitmap)) { | |
733252de | 1316 | trace_qemu_rdma_unregister_waiting_inflight(chunk); |
2da776db MH |
1317 | continue; |
1318 | } | |
1319 | ||
733252de | 1320 | trace_qemu_rdma_unregister_waiting_send(chunk); |
2da776db MH |
1321 | |
1322 | ret = ibv_dereg_mr(block->pmr[chunk]); | |
1323 | block->pmr[chunk] = NULL; | |
1324 | block->remote_keys[chunk] = 0; | |
1325 | ||
1326 | if (ret != 0) { | |
1327 | perror("unregistration chunk failed"); | |
1328 | return -ret; | |
1329 | } | |
1330 | rdma->total_registrations--; | |
1331 | ||
1332 | reg.key.chunk = chunk; | |
b12f7777 | 1333 | register_to_network(rdma, ®); |
2da776db MH |
1334 | ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, |
1335 | &resp, NULL, NULL); | |
1336 | if (ret < 0) { | |
1337 | return ret; | |
1338 | } | |
1339 | ||
733252de | 1340 | trace_qemu_rdma_unregister_waiting_complete(chunk); |
2da776db MH |
1341 | } |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | static uint64_t qemu_rdma_make_wrid(uint64_t wr_id, uint64_t index, | |
1347 | uint64_t chunk) | |
1348 | { | |
1349 | uint64_t result = wr_id & RDMA_WRID_TYPE_MASK; | |
1350 | ||
1351 | result |= (index << RDMA_WRID_BLOCK_SHIFT); | |
1352 | result |= (chunk << RDMA_WRID_CHUNK_SHIFT); | |
1353 | ||
1354 | return result; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Set bit for unregistration in the next iteration. | |
1359 | * We cannot transmit right here, but will unpin later. | |
1360 | */ | |
1361 | static void qemu_rdma_signal_unregister(RDMAContext *rdma, uint64_t index, | |
1362 | uint64_t chunk, uint64_t wr_id) | |
1363 | { | |
1364 | if (rdma->unregistrations[rdma->unregister_next] != 0) { | |
733252de | 1365 | error_report("rdma migration: queue is full"); |
2da776db MH |
1366 | } else { |
1367 | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[index]); | |
1368 | ||
1369 | if (!test_and_set_bit(chunk, block->unregister_bitmap)) { | |
733252de DDAG |
1370 | trace_qemu_rdma_signal_unregister_append(chunk, |
1371 | rdma->unregister_next); | |
2da776db MH |
1372 | |
1373 | rdma->unregistrations[rdma->unregister_next++] = | |
1374 | qemu_rdma_make_wrid(wr_id, index, chunk); | |
1375 | ||
1376 | if (rdma->unregister_next == RDMA_SIGNALED_SEND_MAX) { | |
1377 | rdma->unregister_next = 0; | |
1378 | } | |
1379 | } else { | |
733252de | 1380 | trace_qemu_rdma_signal_unregister_already(chunk); |
2da776db MH |
1381 | } |
1382 | } | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * Consult the connection manager to see a work request | |
1387 | * (of any kind) has completed. | |
1388 | * Return the work request ID that completed. | |
1389 | */ | |
88571882 IY |
1390 | static uint64_t qemu_rdma_poll(RDMAContext *rdma, uint64_t *wr_id_out, |
1391 | uint32_t *byte_len) | |
2da776db MH |
1392 | { |
1393 | int ret; | |
1394 | struct ibv_wc wc; | |
1395 | uint64_t wr_id; | |
1396 | ||
1397 | ret = ibv_poll_cq(rdma->cq, 1, &wc); | |
1398 | ||
1399 | if (!ret) { | |
1400 | *wr_id_out = RDMA_WRID_NONE; | |
1401 | return 0; | |
1402 | } | |
1403 | ||
1404 | if (ret < 0) { | |
733252de | 1405 | error_report("ibv_poll_cq return %d", ret); |
2da776db MH |
1406 | return ret; |
1407 | } | |
1408 | ||
1409 | wr_id = wc.wr_id & RDMA_WRID_TYPE_MASK; | |
1410 | ||
1411 | if (wc.status != IBV_WC_SUCCESS) { | |
1412 | fprintf(stderr, "ibv_poll_cq wc.status=%d %s!\n", | |
1413 | wc.status, ibv_wc_status_str(wc.status)); | |
1414 | fprintf(stderr, "ibv_poll_cq wrid=%s!\n", wrid_desc[wr_id]); | |
1415 | ||
1416 | return -1; | |
1417 | } | |
1418 | ||
1419 | if (rdma->control_ready_expected && | |
1420 | (wr_id >= RDMA_WRID_RECV_CONTROL)) { | |
733252de | 1421 | trace_qemu_rdma_poll_recv(wrid_desc[RDMA_WRID_RECV_CONTROL], |
2da776db MH |
1422 | wr_id - RDMA_WRID_RECV_CONTROL, wr_id, rdma->nb_sent); |
1423 | rdma->control_ready_expected = 0; | |
1424 | } | |
1425 | ||
1426 | if (wr_id == RDMA_WRID_RDMA_WRITE) { | |
1427 | uint64_t chunk = | |
1428 | (wc.wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; | |
1429 | uint64_t index = | |
1430 | (wc.wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; | |
1431 | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[index]); | |
1432 | ||
733252de | 1433 | trace_qemu_rdma_poll_write(print_wrid(wr_id), wr_id, rdma->nb_sent, |
fbce8c25 SW |
1434 | index, chunk, block->local_host_addr, |
1435 | (void *)(uintptr_t)block->remote_host_addr); | |
2da776db MH |
1436 | |
1437 | clear_bit(chunk, block->transit_bitmap); | |
1438 | ||
1439 | if (rdma->nb_sent > 0) { | |
1440 | rdma->nb_sent--; | |
1441 | } | |
1442 | ||
1443 | if (!rdma->pin_all) { | |
1444 | /* | |
1445 | * FYI: If one wanted to signal a specific chunk to be unregistered | |
1446 | * using LRU or workload-specific information, this is the function | |
1447 | * you would call to do so. That chunk would then get asynchronously | |
1448 | * unregistered later. | |
1449 | */ | |
1450 | #ifdef RDMA_UNREGISTRATION_EXAMPLE | |
1451 | qemu_rdma_signal_unregister(rdma, index, chunk, wc.wr_id); | |
1452 | #endif | |
1453 | } | |
1454 | } else { | |
733252de | 1455 | trace_qemu_rdma_poll_other(print_wrid(wr_id), wr_id, rdma->nb_sent); |
2da776db MH |
1456 | } |
1457 | ||
1458 | *wr_id_out = wc.wr_id; | |
88571882 IY |
1459 | if (byte_len) { |
1460 | *byte_len = wc.byte_len; | |
1461 | } | |
2da776db MH |
1462 | |
1463 | return 0; | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Block until the next work request has completed. | |
1468 | * | |
1469 | * First poll to see if a work request has already completed, | |
1470 | * otherwise block. | |
1471 | * | |
1472 | * If we encounter completed work requests for IDs other than | |
1473 | * the one we're interested in, then that's generally an error. | |
1474 | * | |
1475 | * The only exception is actual RDMA Write completions. These | |
1476 | * completions only need to be recorded, but do not actually | |
1477 | * need further processing. | |
1478 | */ | |
88571882 IY |
1479 | static int qemu_rdma_block_for_wrid(RDMAContext *rdma, int wrid_requested, |
1480 | uint32_t *byte_len) | |
2da776db MH |
1481 | { |
1482 | int num_cq_events = 0, ret = 0; | |
1483 | struct ibv_cq *cq; | |
1484 | void *cq_ctx; | |
1485 | uint64_t wr_id = RDMA_WRID_NONE, wr_id_in; | |
1486 | ||
1487 | if (ibv_req_notify_cq(rdma->cq, 0)) { | |
1488 | return -1; | |
1489 | } | |
1490 | /* poll cq first */ | |
1491 | while (wr_id != wrid_requested) { | |
88571882 | 1492 | ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len); |
2da776db MH |
1493 | if (ret < 0) { |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
1498 | ||
1499 | if (wr_id == RDMA_WRID_NONE) { | |
1500 | break; | |
1501 | } | |
1502 | if (wr_id != wrid_requested) { | |
733252de DDAG |
1503 | trace_qemu_rdma_block_for_wrid_miss(print_wrid(wrid_requested), |
1504 | wrid_requested, print_wrid(wr_id), wr_id); | |
2da776db MH |
1505 | } |
1506 | } | |
1507 | ||
1508 | if (wr_id == wrid_requested) { | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | while (1) { | |
1513 | /* | |
22724f49 | 1514 | * Coroutine doesn't start until migration_fd_process_incoming() |
2da776db MH |
1515 | * so don't yield unless we know we're running inside of a coroutine. |
1516 | */ | |
1517 | if (rdma->migration_started_on_destination) { | |
1518 | yield_until_fd_readable(rdma->comp_channel->fd); | |
1519 | } | |
1520 | ||
1521 | if (ibv_get_cq_event(rdma->comp_channel, &cq, &cq_ctx)) { | |
1522 | perror("ibv_get_cq_event"); | |
1523 | goto err_block_for_wrid; | |
1524 | } | |
1525 | ||
1526 | num_cq_events++; | |
1527 | ||
1528 | if (ibv_req_notify_cq(cq, 0)) { | |
1529 | goto err_block_for_wrid; | |
1530 | } | |
1531 | ||
1532 | while (wr_id != wrid_requested) { | |
88571882 | 1533 | ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len); |
2da776db MH |
1534 | if (ret < 0) { |
1535 | goto err_block_for_wrid; | |
1536 | } | |
1537 | ||
1538 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
1539 | ||
1540 | if (wr_id == RDMA_WRID_NONE) { | |
1541 | break; | |
1542 | } | |
1543 | if (wr_id != wrid_requested) { | |
733252de DDAG |
1544 | trace_qemu_rdma_block_for_wrid_miss(print_wrid(wrid_requested), |
1545 | wrid_requested, print_wrid(wr_id), wr_id); | |
2da776db MH |
1546 | } |
1547 | } | |
1548 | ||
1549 | if (wr_id == wrid_requested) { | |
1550 | goto success_block_for_wrid; | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | success_block_for_wrid: | |
1555 | if (num_cq_events) { | |
1556 | ibv_ack_cq_events(cq, num_cq_events); | |
1557 | } | |
1558 | return 0; | |
1559 | ||
1560 | err_block_for_wrid: | |
1561 | if (num_cq_events) { | |
1562 | ibv_ack_cq_events(cq, num_cq_events); | |
1563 | } | |
1564 | return ret; | |
1565 | } | |
1566 | ||
1567 | /* | |
1568 | * Post a SEND message work request for the control channel | |
1569 | * containing some data and block until the post completes. | |
1570 | */ | |
1571 | static int qemu_rdma_post_send_control(RDMAContext *rdma, uint8_t *buf, | |
1572 | RDMAControlHeader *head) | |
1573 | { | |
1574 | int ret = 0; | |
1f22364b | 1575 | RDMAWorkRequestData *wr = &rdma->wr_data[RDMA_WRID_CONTROL]; |
2da776db MH |
1576 | struct ibv_send_wr *bad_wr; |
1577 | struct ibv_sge sge = { | |
fbce8c25 | 1578 | .addr = (uintptr_t)(wr->control), |
2da776db MH |
1579 | .length = head->len + sizeof(RDMAControlHeader), |
1580 | .lkey = wr->control_mr->lkey, | |
1581 | }; | |
1582 | struct ibv_send_wr send_wr = { | |
1583 | .wr_id = RDMA_WRID_SEND_CONTROL, | |
1584 | .opcode = IBV_WR_SEND, | |
1585 | .send_flags = IBV_SEND_SIGNALED, | |
1586 | .sg_list = &sge, | |
1587 | .num_sge = 1, | |
1588 | }; | |
1589 | ||
733252de | 1590 | trace_qemu_rdma_post_send_control(control_desc[head->type]); |
2da776db MH |
1591 | |
1592 | /* | |
1593 | * We don't actually need to do a memcpy() in here if we used | |
1594 | * the "sge" properly, but since we're only sending control messages | |
1595 | * (not RAM in a performance-critical path), then its OK for now. | |
1596 | * | |
1597 | * The copy makes the RDMAControlHeader simpler to manipulate | |
1598 | * for the time being. | |
1599 | */ | |
6f1484ed | 1600 | assert(head->len <= RDMA_CONTROL_MAX_BUFFER - sizeof(*head)); |
2da776db MH |
1601 | memcpy(wr->control, head, sizeof(RDMAControlHeader)); |
1602 | control_to_network((void *) wr->control); | |
1603 | ||
1604 | if (buf) { | |
1605 | memcpy(wr->control + sizeof(RDMAControlHeader), buf, head->len); | |
1606 | } | |
1607 | ||
1608 | ||
e325b49a | 1609 | ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); |
2da776db | 1610 | |
e325b49a | 1611 | if (ret > 0) { |
733252de | 1612 | error_report("Failed to use post IB SEND for control"); |
e325b49a | 1613 | return -ret; |
2da776db MH |
1614 | } |
1615 | ||
88571882 | 1616 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_SEND_CONTROL, NULL); |
2da776db | 1617 | if (ret < 0) { |
733252de | 1618 | error_report("rdma migration: send polling control error"); |
2da776db MH |
1619 | } |
1620 | ||
1621 | return ret; | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * Post a RECV work request in anticipation of some future receipt | |
1626 | * of data on the control channel. | |
1627 | */ | |
1628 | static int qemu_rdma_post_recv_control(RDMAContext *rdma, int idx) | |
1629 | { | |
1630 | struct ibv_recv_wr *bad_wr; | |
1631 | struct ibv_sge sge = { | |
fbce8c25 | 1632 | .addr = (uintptr_t)(rdma->wr_data[idx].control), |
2da776db MH |
1633 | .length = RDMA_CONTROL_MAX_BUFFER, |
1634 | .lkey = rdma->wr_data[idx].control_mr->lkey, | |
1635 | }; | |
1636 | ||
1637 | struct ibv_recv_wr recv_wr = { | |
1638 | .wr_id = RDMA_WRID_RECV_CONTROL + idx, | |
1639 | .sg_list = &sge, | |
1640 | .num_sge = 1, | |
1641 | }; | |
1642 | ||
1643 | ||
1644 | if (ibv_post_recv(rdma->qp, &recv_wr, &bad_wr)) { | |
1645 | return -1; | |
1646 | } | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Block and wait for a RECV control channel message to arrive. | |
1653 | */ | |
1654 | static int qemu_rdma_exchange_get_response(RDMAContext *rdma, | |
1655 | RDMAControlHeader *head, int expecting, int idx) | |
1656 | { | |
88571882 IY |
1657 | uint32_t byte_len; |
1658 | int ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RECV_CONTROL + idx, | |
1659 | &byte_len); | |
2da776db MH |
1660 | |
1661 | if (ret < 0) { | |
733252de | 1662 | error_report("rdma migration: recv polling control error!"); |
2da776db MH |
1663 | return ret; |
1664 | } | |
1665 | ||
1666 | network_to_control((void *) rdma->wr_data[idx].control); | |
1667 | memcpy(head, rdma->wr_data[idx].control, sizeof(RDMAControlHeader)); | |
1668 | ||
733252de | 1669 | trace_qemu_rdma_exchange_get_response_start(control_desc[expecting]); |
2da776db MH |
1670 | |
1671 | if (expecting == RDMA_CONTROL_NONE) { | |
733252de DDAG |
1672 | trace_qemu_rdma_exchange_get_response_none(control_desc[head->type], |
1673 | head->type); | |
2da776db | 1674 | } else if (head->type != expecting || head->type == RDMA_CONTROL_ERROR) { |
733252de DDAG |
1675 | error_report("Was expecting a %s (%d) control message" |
1676 | ", but got: %s (%d), length: %d", | |
2da776db MH |
1677 | control_desc[expecting], expecting, |
1678 | control_desc[head->type], head->type, head->len); | |
1679 | return -EIO; | |
1680 | } | |
6f1484ed | 1681 | if (head->len > RDMA_CONTROL_MAX_BUFFER - sizeof(*head)) { |
81b07353 | 1682 | error_report("too long length: %d", head->len); |
6f1484ed IY |
1683 | return -EINVAL; |
1684 | } | |
88571882 | 1685 | if (sizeof(*head) + head->len != byte_len) { |
733252de | 1686 | error_report("Malformed length: %d byte_len %d", head->len, byte_len); |
88571882 IY |
1687 | return -EINVAL; |
1688 | } | |
2da776db MH |
1689 | |
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | /* | |
1694 | * When a RECV work request has completed, the work request's | |
1695 | * buffer is pointed at the header. | |
1696 | * | |
1697 | * This will advance the pointer to the data portion | |
1698 | * of the control message of the work request's buffer that | |
1699 | * was populated after the work request finished. | |
1700 | */ | |
1701 | static void qemu_rdma_move_header(RDMAContext *rdma, int idx, | |
1702 | RDMAControlHeader *head) | |
1703 | { | |
1704 | rdma->wr_data[idx].control_len = head->len; | |
1705 | rdma->wr_data[idx].control_curr = | |
1706 | rdma->wr_data[idx].control + sizeof(RDMAControlHeader); | |
1707 | } | |
1708 | ||
1709 | /* | |
1710 | * This is an 'atomic' high-level operation to deliver a single, unified | |
1711 | * control-channel message. | |
1712 | * | |
1713 | * Additionally, if the user is expecting some kind of reply to this message, | |
1714 | * they can request a 'resp' response message be filled in by posting an | |
1715 | * additional work request on behalf of the user and waiting for an additional | |
1716 | * completion. | |
1717 | * | |
1718 | * The extra (optional) response is used during registration to us from having | |
1719 | * to perform an *additional* exchange of message just to provide a response by | |
1720 | * instead piggy-backing on the acknowledgement. | |
1721 | */ | |
1722 | static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, | |
1723 | uint8_t *data, RDMAControlHeader *resp, | |
1724 | int *resp_idx, | |
1725 | int (*callback)(RDMAContext *rdma)) | |
1726 | { | |
1727 | int ret = 0; | |
1728 | ||
1729 | /* | |
1730 | * Wait until the dest is ready before attempting to deliver the message | |
1731 | * by waiting for a READY message. | |
1732 | */ | |
1733 | if (rdma->control_ready_expected) { | |
1734 | RDMAControlHeader resp; | |
1735 | ret = qemu_rdma_exchange_get_response(rdma, | |
1736 | &resp, RDMA_CONTROL_READY, RDMA_WRID_READY); | |
1737 | if (ret < 0) { | |
1738 | return ret; | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | /* | |
1743 | * If the user is expecting a response, post a WR in anticipation of it. | |
1744 | */ | |
1745 | if (resp) { | |
1746 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_DATA); | |
1747 | if (ret) { | |
733252de | 1748 | error_report("rdma migration: error posting" |
2da776db MH |
1749 | " extra control recv for anticipated result!"); |
1750 | return ret; | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * Post a WR to replace the one we just consumed for the READY message. | |
1756 | */ | |
1757 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); | |
1758 | if (ret) { | |
733252de | 1759 | error_report("rdma migration: error posting first control recv!"); |
2da776db MH |
1760 | return ret; |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * Deliver the control message that was requested. | |
1765 | */ | |
1766 | ret = qemu_rdma_post_send_control(rdma, data, head); | |
1767 | ||
1768 | if (ret < 0) { | |
733252de | 1769 | error_report("Failed to send control buffer!"); |
2da776db MH |
1770 | return ret; |
1771 | } | |
1772 | ||
1773 | /* | |
1774 | * If we're expecting a response, block and wait for it. | |
1775 | */ | |
1776 | if (resp) { | |
1777 | if (callback) { | |
733252de | 1778 | trace_qemu_rdma_exchange_send_issue_callback(); |
2da776db MH |
1779 | ret = callback(rdma); |
1780 | if (ret < 0) { | |
1781 | return ret; | |
1782 | } | |
1783 | } | |
1784 | ||
733252de | 1785 | trace_qemu_rdma_exchange_send_waiting(control_desc[resp->type]); |
2da776db MH |
1786 | ret = qemu_rdma_exchange_get_response(rdma, resp, |
1787 | resp->type, RDMA_WRID_DATA); | |
1788 | ||
1789 | if (ret < 0) { | |
1790 | return ret; | |
1791 | } | |
1792 | ||
1793 | qemu_rdma_move_header(rdma, RDMA_WRID_DATA, resp); | |
1794 | if (resp_idx) { | |
1795 | *resp_idx = RDMA_WRID_DATA; | |
1796 | } | |
733252de | 1797 | trace_qemu_rdma_exchange_send_received(control_desc[resp->type]); |
2da776db MH |
1798 | } |
1799 | ||
1800 | rdma->control_ready_expected = 1; | |
1801 | ||
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | /* | |
1806 | * This is an 'atomic' high-level operation to receive a single, unified | |
1807 | * control-channel message. | |
1808 | */ | |
1809 | static int qemu_rdma_exchange_recv(RDMAContext *rdma, RDMAControlHeader *head, | |
1810 | int expecting) | |
1811 | { | |
1812 | RDMAControlHeader ready = { | |
1813 | .len = 0, | |
1814 | .type = RDMA_CONTROL_READY, | |
1815 | .repeat = 1, | |
1816 | }; | |
1817 | int ret; | |
1818 | ||
1819 | /* | |
1820 | * Inform the source that we're ready to receive a message. | |
1821 | */ | |
1822 | ret = qemu_rdma_post_send_control(rdma, NULL, &ready); | |
1823 | ||
1824 | if (ret < 0) { | |
733252de | 1825 | error_report("Failed to send control buffer!"); |
2da776db MH |
1826 | return ret; |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * Block and wait for the message. | |
1831 | */ | |
1832 | ret = qemu_rdma_exchange_get_response(rdma, head, | |
1833 | expecting, RDMA_WRID_READY); | |
1834 | ||
1835 | if (ret < 0) { | |
1836 | return ret; | |
1837 | } | |
1838 | ||
1839 | qemu_rdma_move_header(rdma, RDMA_WRID_READY, head); | |
1840 | ||
1841 | /* | |
1842 | * Post a new RECV work request to replace the one we just consumed. | |
1843 | */ | |
1844 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); | |
1845 | if (ret) { | |
733252de | 1846 | error_report("rdma migration: error posting second control recv!"); |
2da776db MH |
1847 | return ret; |
1848 | } | |
1849 | ||
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * Write an actual chunk of memory using RDMA. | |
1855 | * | |
1856 | * If we're using dynamic registration on the dest-side, we have to | |
1857 | * send a registration command first. | |
1858 | */ | |
1859 | static int qemu_rdma_write_one(QEMUFile *f, RDMAContext *rdma, | |
1860 | int current_index, uint64_t current_addr, | |
1861 | uint64_t length) | |
1862 | { | |
1863 | struct ibv_sge sge; | |
1864 | struct ibv_send_wr send_wr = { 0 }; | |
1865 | struct ibv_send_wr *bad_wr; | |
1866 | int reg_result_idx, ret, count = 0; | |
1867 | uint64_t chunk, chunks; | |
1868 | uint8_t *chunk_start, *chunk_end; | |
1869 | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[current_index]); | |
1870 | RDMARegister reg; | |
1871 | RDMARegisterResult *reg_result; | |
1872 | RDMAControlHeader resp = { .type = RDMA_CONTROL_REGISTER_RESULT }; | |
1873 | RDMAControlHeader head = { .len = sizeof(RDMARegister), | |
1874 | .type = RDMA_CONTROL_REGISTER_REQUEST, | |
1875 | .repeat = 1, | |
1876 | }; | |
1877 | ||
1878 | retry: | |
fbce8c25 | 1879 | sge.addr = (uintptr_t)(block->local_host_addr + |
2da776db MH |
1880 | (current_addr - block->offset)); |
1881 | sge.length = length; | |
1882 | ||
fbce8c25 SW |
1883 | chunk = ram_chunk_index(block->local_host_addr, |
1884 | (uint8_t *)(uintptr_t)sge.addr); | |
2da776db MH |
1885 | chunk_start = ram_chunk_start(block, chunk); |
1886 | ||
1887 | if (block->is_ram_block) { | |
1888 | chunks = length / (1UL << RDMA_REG_CHUNK_SHIFT); | |
1889 | ||
1890 | if (chunks && ((length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { | |
1891 | chunks--; | |
1892 | } | |
1893 | } else { | |
1894 | chunks = block->length / (1UL << RDMA_REG_CHUNK_SHIFT); | |
1895 | ||
1896 | if (chunks && ((block->length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { | |
1897 | chunks--; | |
1898 | } | |
1899 | } | |
1900 | ||
733252de DDAG |
1901 | trace_qemu_rdma_write_one_top(chunks + 1, |
1902 | (chunks + 1) * | |
1903 | (1UL << RDMA_REG_CHUNK_SHIFT) / 1024 / 1024); | |
2da776db MH |
1904 | |
1905 | chunk_end = ram_chunk_end(block, chunk + chunks); | |
1906 | ||
1907 | if (!rdma->pin_all) { | |
1908 | #ifdef RDMA_UNREGISTRATION_EXAMPLE | |
1909 | qemu_rdma_unregister_waiting(rdma); | |
1910 | #endif | |
1911 | } | |
1912 | ||
1913 | while (test_bit(chunk, block->transit_bitmap)) { | |
1914 | (void)count; | |
733252de | 1915 | trace_qemu_rdma_write_one_block(count++, current_index, chunk, |
2da776db MH |
1916 | sge.addr, length, rdma->nb_sent, block->nb_chunks); |
1917 | ||
88571882 | 1918 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); |
2da776db MH |
1919 | |
1920 | if (ret < 0) { | |
733252de | 1921 | error_report("Failed to Wait for previous write to complete " |
2da776db | 1922 | "block %d chunk %" PRIu64 |
733252de | 1923 | " current %" PRIu64 " len %" PRIu64 " %d", |
2da776db MH |
1924 | current_index, chunk, sge.addr, length, rdma->nb_sent); |
1925 | return ret; | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | if (!rdma->pin_all || !block->is_ram_block) { | |
1930 | if (!block->remote_keys[chunk]) { | |
1931 | /* | |
1932 | * This chunk has not yet been registered, so first check to see | |
1933 | * if the entire chunk is zero. If so, tell the other size to | |
1934 | * memset() + madvise() the entire chunk without RDMA. | |
1935 | */ | |
1936 | ||
fbce8c25 SW |
1937 | if (can_use_buffer_find_nonzero_offset((void *)(uintptr_t)sge.addr, |
1938 | length) | |
1939 | && buffer_find_nonzero_offset((void *)(uintptr_t)sge.addr, | |
2da776db MH |
1940 | length) == length) { |
1941 | RDMACompress comp = { | |
1942 | .offset = current_addr, | |
1943 | .value = 0, | |
1944 | .block_idx = current_index, | |
1945 | .length = length, | |
1946 | }; | |
1947 | ||
1948 | head.len = sizeof(comp); | |
1949 | head.type = RDMA_CONTROL_COMPRESS; | |
1950 | ||
733252de DDAG |
1951 | trace_qemu_rdma_write_one_zero(chunk, sge.length, |
1952 | current_index, current_addr); | |
2da776db | 1953 | |
b12f7777 | 1954 | compress_to_network(rdma, &comp); |
2da776db MH |
1955 | ret = qemu_rdma_exchange_send(rdma, &head, |
1956 | (uint8_t *) &comp, NULL, NULL, NULL); | |
1957 | ||
1958 | if (ret < 0) { | |
1959 | return -EIO; | |
1960 | } | |
1961 | ||
1962 | acct_update_position(f, sge.length, true); | |
1963 | ||
1964 | return 1; | |
1965 | } | |
1966 | ||
1967 | /* | |
1968 | * Otherwise, tell other side to register. | |
1969 | */ | |
1970 | reg.current_index = current_index; | |
1971 | if (block->is_ram_block) { | |
1972 | reg.key.current_addr = current_addr; | |
1973 | } else { | |
1974 | reg.key.chunk = chunk; | |
1975 | } | |
1976 | reg.chunks = chunks; | |
1977 | ||
733252de DDAG |
1978 | trace_qemu_rdma_write_one_sendreg(chunk, sge.length, current_index, |
1979 | current_addr); | |
2da776db | 1980 | |
b12f7777 | 1981 | register_to_network(rdma, ®); |
2da776db MH |
1982 | ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, |
1983 | &resp, ®_result_idx, NULL); | |
1984 | if (ret < 0) { | |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | /* try to overlap this single registration with the one we sent. */ | |
3ac040c0 | 1989 | if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, |
2da776db MH |
1990 | &sge.lkey, NULL, chunk, |
1991 | chunk_start, chunk_end)) { | |
733252de | 1992 | error_report("cannot get lkey"); |
2da776db MH |
1993 | return -EINVAL; |
1994 | } | |
1995 | ||
1996 | reg_result = (RDMARegisterResult *) | |
1997 | rdma->wr_data[reg_result_idx].control_curr; | |
1998 | ||
1999 | network_to_result(reg_result); | |
2000 | ||
733252de DDAG |
2001 | trace_qemu_rdma_write_one_recvregres(block->remote_keys[chunk], |
2002 | reg_result->rkey, chunk); | |
2da776db MH |
2003 | |
2004 | block->remote_keys[chunk] = reg_result->rkey; | |
2005 | block->remote_host_addr = reg_result->host_addr; | |
2006 | } else { | |
2007 | /* already registered before */ | |
3ac040c0 | 2008 | if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, |
2da776db MH |
2009 | &sge.lkey, NULL, chunk, |
2010 | chunk_start, chunk_end)) { | |
733252de | 2011 | error_report("cannot get lkey!"); |
2da776db MH |
2012 | return -EINVAL; |
2013 | } | |
2014 | } | |
2015 | ||
2016 | send_wr.wr.rdma.rkey = block->remote_keys[chunk]; | |
2017 | } else { | |
2018 | send_wr.wr.rdma.rkey = block->remote_rkey; | |
2019 | ||
3ac040c0 | 2020 | if (qemu_rdma_register_and_get_keys(rdma, block, sge.addr, |
2da776db MH |
2021 | &sge.lkey, NULL, chunk, |
2022 | chunk_start, chunk_end)) { | |
733252de | 2023 | error_report("cannot get lkey!"); |
2da776db MH |
2024 | return -EINVAL; |
2025 | } | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * Encode the ram block index and chunk within this wrid. | |
2030 | * We will use this information at the time of completion | |
2031 | * to figure out which bitmap to check against and then which | |
2032 | * chunk in the bitmap to look for. | |
2033 | */ | |
2034 | send_wr.wr_id = qemu_rdma_make_wrid(RDMA_WRID_RDMA_WRITE, | |
2035 | current_index, chunk); | |
2036 | ||
2037 | send_wr.opcode = IBV_WR_RDMA_WRITE; | |
2038 | send_wr.send_flags = IBV_SEND_SIGNALED; | |
2039 | send_wr.sg_list = &sge; | |
2040 | send_wr.num_sge = 1; | |
2041 | send_wr.wr.rdma.remote_addr = block->remote_host_addr + | |
2042 | (current_addr - block->offset); | |
2043 | ||
733252de DDAG |
2044 | trace_qemu_rdma_write_one_post(chunk, sge.addr, send_wr.wr.rdma.remote_addr, |
2045 | sge.length); | |
2da776db MH |
2046 | |
2047 | /* | |
2048 | * ibv_post_send() does not return negative error numbers, | |
2049 | * per the specification they are positive - no idea why. | |
2050 | */ | |
2051 | ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); | |
2052 | ||
2053 | if (ret == ENOMEM) { | |
733252de | 2054 | trace_qemu_rdma_write_one_queue_full(); |
88571882 | 2055 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); |
2da776db | 2056 | if (ret < 0) { |
733252de DDAG |
2057 | error_report("rdma migration: failed to make " |
2058 | "room in full send queue! %d", ret); | |
2da776db MH |
2059 | return ret; |
2060 | } | |
2061 | ||
2062 | goto retry; | |
2063 | ||
2064 | } else if (ret > 0) { | |
2065 | perror("rdma migration: post rdma write failed"); | |
2066 | return -ret; | |
2067 | } | |
2068 | ||
2069 | set_bit(chunk, block->transit_bitmap); | |
2070 | acct_update_position(f, sge.length, false); | |
2071 | rdma->total_writes++; | |
2072 | ||
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * Push out any unwritten RDMA operations. | |
2078 | * | |
2079 | * We support sending out multiple chunks at the same time. | |
2080 | * Not all of them need to get signaled in the completion queue. | |
2081 | */ | |
2082 | static int qemu_rdma_write_flush(QEMUFile *f, RDMAContext *rdma) | |
2083 | { | |
2084 | int ret; | |
2085 | ||
2086 | if (!rdma->current_length) { | |
2087 | return 0; | |
2088 | } | |
2089 | ||
2090 | ret = qemu_rdma_write_one(f, rdma, | |
2091 | rdma->current_index, rdma->current_addr, rdma->current_length); | |
2092 | ||
2093 | if (ret < 0) { | |
2094 | return ret; | |
2095 | } | |
2096 | ||
2097 | if (ret == 0) { | |
2098 | rdma->nb_sent++; | |
733252de | 2099 | trace_qemu_rdma_write_flush(rdma->nb_sent); |
2da776db MH |
2100 | } |
2101 | ||
2102 | rdma->current_length = 0; | |
2103 | rdma->current_addr = 0; | |
2104 | ||
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | static inline int qemu_rdma_buffer_mergable(RDMAContext *rdma, | |
2109 | uint64_t offset, uint64_t len) | |
2110 | { | |
44b59494 IY |
2111 | RDMALocalBlock *block; |
2112 | uint8_t *host_addr; | |
2113 | uint8_t *chunk_end; | |
2114 | ||
2115 | if (rdma->current_index < 0) { | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | if (rdma->current_chunk < 0) { | |
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | block = &(rdma->local_ram_blocks.block[rdma->current_index]); | |
2124 | host_addr = block->local_host_addr + (offset - block->offset); | |
2125 | chunk_end = ram_chunk_end(block, rdma->current_chunk); | |
2da776db MH |
2126 | |
2127 | if (rdma->current_length == 0) { | |
2128 | return 0; | |
2129 | } | |
2130 | ||
2131 | /* | |
2132 | * Only merge into chunk sequentially. | |
2133 | */ | |
2134 | if (offset != (rdma->current_addr + rdma->current_length)) { | |
2135 | return 0; | |
2136 | } | |
2137 | ||
2da776db MH |
2138 | if (offset < block->offset) { |
2139 | return 0; | |
2140 | } | |
2141 | ||
2142 | if ((offset + len) > (block->offset + block->length)) { | |
2143 | return 0; | |
2144 | } | |
2145 | ||
2da776db MH |
2146 | if ((host_addr + len) > chunk_end) { |
2147 | return 0; | |
2148 | } | |
2149 | ||
2150 | return 1; | |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * We're not actually writing here, but doing three things: | |
2155 | * | |
2156 | * 1. Identify the chunk the buffer belongs to. | |
2157 | * 2. If the chunk is full or the buffer doesn't belong to the current | |
2158 | * chunk, then start a new chunk and flush() the old chunk. | |
2159 | * 3. To keep the hardware busy, we also group chunks into batches | |
2160 | * and only require that a batch gets acknowledged in the completion | |
2161 | * qeueue instead of each individual chunk. | |
2162 | */ | |
2163 | static int qemu_rdma_write(QEMUFile *f, RDMAContext *rdma, | |
2164 | uint64_t block_offset, uint64_t offset, | |
2165 | uint64_t len) | |
2166 | { | |
2167 | uint64_t current_addr = block_offset + offset; | |
2168 | uint64_t index = rdma->current_index; | |
2169 | uint64_t chunk = rdma->current_chunk; | |
2170 | int ret; | |
2171 | ||
2172 | /* If we cannot merge it, we flush the current buffer first. */ | |
2173 | if (!qemu_rdma_buffer_mergable(rdma, current_addr, len)) { | |
2174 | ret = qemu_rdma_write_flush(f, rdma); | |
2175 | if (ret) { | |
2176 | return ret; | |
2177 | } | |
2178 | rdma->current_length = 0; | |
2179 | rdma->current_addr = current_addr; | |
2180 | ||
2181 | ret = qemu_rdma_search_ram_block(rdma, block_offset, | |
2182 | offset, len, &index, &chunk); | |
2183 | if (ret) { | |
733252de | 2184 | error_report("ram block search failed"); |
2da776db MH |
2185 | return ret; |
2186 | } | |
2187 | rdma->current_index = index; | |
2188 | rdma->current_chunk = chunk; | |
2189 | } | |
2190 | ||
2191 | /* merge it */ | |
2192 | rdma->current_length += len; | |
2193 | ||
2194 | /* flush it if buffer is too large */ | |
2195 | if (rdma->current_length >= RDMA_MERGE_MAX) { | |
2196 | return qemu_rdma_write_flush(f, rdma); | |
2197 | } | |
2198 | ||
2199 | return 0; | |
2200 | } | |
2201 | ||
2202 | static void qemu_rdma_cleanup(RDMAContext *rdma) | |
2203 | { | |
2204 | struct rdma_cm_event *cm_event; | |
2205 | int ret, idx; | |
2206 | ||
5a91337c | 2207 | if (rdma->cm_id && rdma->connected) { |
2da776db MH |
2208 | if (rdma->error_state) { |
2209 | RDMAControlHeader head = { .len = 0, | |
2210 | .type = RDMA_CONTROL_ERROR, | |
2211 | .repeat = 1, | |
2212 | }; | |
733252de | 2213 | error_report("Early error. Sending error."); |
2da776db MH |
2214 | qemu_rdma_post_send_control(rdma, NULL, &head); |
2215 | } | |
2216 | ||
2217 | ret = rdma_disconnect(rdma->cm_id); | |
2218 | if (!ret) { | |
733252de | 2219 | trace_qemu_rdma_cleanup_waiting_for_disconnect(); |
2da776db MH |
2220 | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
2221 | if (!ret) { | |
2222 | rdma_ack_cm_event(cm_event); | |
2223 | } | |
2224 | } | |
733252de | 2225 | trace_qemu_rdma_cleanup_disconnect(); |
5a91337c | 2226 | rdma->connected = false; |
2da776db MH |
2227 | } |
2228 | ||
a97270ad DDAG |
2229 | g_free(rdma->dest_blocks); |
2230 | rdma->dest_blocks = NULL; | |
2da776db | 2231 | |
1f22364b | 2232 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
2233 | if (rdma->wr_data[idx].control_mr) { |
2234 | rdma->total_registrations--; | |
2235 | ibv_dereg_mr(rdma->wr_data[idx].control_mr); | |
2236 | } | |
2237 | rdma->wr_data[idx].control_mr = NULL; | |
2238 | } | |
2239 | ||
2240 | if (rdma->local_ram_blocks.block) { | |
2241 | while (rdma->local_ram_blocks.nb_blocks) { | |
03fcab38 | 2242 | rdma_delete_block(rdma, &rdma->local_ram_blocks.block[0]); |
2da776db MH |
2243 | } |
2244 | } | |
2245 | ||
80b262e1 PR |
2246 | if (rdma->qp) { |
2247 | rdma_destroy_qp(rdma->cm_id); | |
2248 | rdma->qp = NULL; | |
2249 | } | |
2da776db MH |
2250 | if (rdma->cq) { |
2251 | ibv_destroy_cq(rdma->cq); | |
2252 | rdma->cq = NULL; | |
2253 | } | |
2254 | if (rdma->comp_channel) { | |
2255 | ibv_destroy_comp_channel(rdma->comp_channel); | |
2256 | rdma->comp_channel = NULL; | |
2257 | } | |
2258 | if (rdma->pd) { | |
2259 | ibv_dealloc_pd(rdma->pd); | |
2260 | rdma->pd = NULL; | |
2261 | } | |
2da776db MH |
2262 | if (rdma->cm_id) { |
2263 | rdma_destroy_id(rdma->cm_id); | |
2264 | rdma->cm_id = NULL; | |
2265 | } | |
80b262e1 PR |
2266 | if (rdma->listen_id) { |
2267 | rdma_destroy_id(rdma->listen_id); | |
2268 | rdma->listen_id = NULL; | |
2269 | } | |
2da776db MH |
2270 | if (rdma->channel) { |
2271 | rdma_destroy_event_channel(rdma->channel); | |
2272 | rdma->channel = NULL; | |
2273 | } | |
e1d0fb37 IY |
2274 | g_free(rdma->host); |
2275 | rdma->host = NULL; | |
2da776db MH |
2276 | } |
2277 | ||
2278 | ||
2279 | static int qemu_rdma_source_init(RDMAContext *rdma, Error **errp, bool pin_all) | |
2280 | { | |
2281 | int ret, idx; | |
2282 | Error *local_err = NULL, **temp = &local_err; | |
2283 | ||
2284 | /* | |
2285 | * Will be validated against destination's actual capabilities | |
2286 | * after the connect() completes. | |
2287 | */ | |
2288 | rdma->pin_all = pin_all; | |
2289 | ||
2290 | ret = qemu_rdma_resolve_host(rdma, temp); | |
2291 | if (ret) { | |
2292 | goto err_rdma_source_init; | |
2293 | } | |
2294 | ||
2295 | ret = qemu_rdma_alloc_pd_cq(rdma); | |
2296 | if (ret) { | |
2297 | ERROR(temp, "rdma migration: error allocating pd and cq! Your mlock()" | |
2298 | " limits may be too low. Please check $ ulimit -a # and " | |
66988941 | 2299 | "search for 'ulimit -l' in the output"); |
2da776db MH |
2300 | goto err_rdma_source_init; |
2301 | } | |
2302 | ||
2303 | ret = qemu_rdma_alloc_qp(rdma); | |
2304 | if (ret) { | |
66988941 | 2305 | ERROR(temp, "rdma migration: error allocating qp!"); |
2da776db MH |
2306 | goto err_rdma_source_init; |
2307 | } | |
2308 | ||
2309 | ret = qemu_rdma_init_ram_blocks(rdma); | |
2310 | if (ret) { | |
66988941 | 2311 | ERROR(temp, "rdma migration: error initializing ram blocks!"); |
2da776db MH |
2312 | goto err_rdma_source_init; |
2313 | } | |
2314 | ||
760ff4be DDAG |
2315 | /* Build the hash that maps from offset to RAMBlock */ |
2316 | rdma->blockmap = g_hash_table_new(g_direct_hash, g_direct_equal); | |
2317 | for (idx = 0; idx < rdma->local_ram_blocks.nb_blocks; idx++) { | |
2318 | g_hash_table_insert(rdma->blockmap, | |
2319 | (void *)(uintptr_t)rdma->local_ram_blocks.block[idx].offset, | |
2320 | &rdma->local_ram_blocks.block[idx]); | |
2321 | } | |
2322 | ||
1f22364b | 2323 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
2324 | ret = qemu_rdma_reg_control(rdma, idx); |
2325 | if (ret) { | |
66988941 | 2326 | ERROR(temp, "rdma migration: error registering %d control!", |
2da776db MH |
2327 | idx); |
2328 | goto err_rdma_source_init; | |
2329 | } | |
2330 | } | |
2331 | ||
2332 | return 0; | |
2333 | ||
2334 | err_rdma_source_init: | |
2335 | error_propagate(errp, local_err); | |
2336 | qemu_rdma_cleanup(rdma); | |
2337 | return -1; | |
2338 | } | |
2339 | ||
2340 | static int qemu_rdma_connect(RDMAContext *rdma, Error **errp) | |
2341 | { | |
2342 | RDMACapabilities cap = { | |
2343 | .version = RDMA_CONTROL_VERSION_CURRENT, | |
2344 | .flags = 0, | |
2345 | }; | |
2346 | struct rdma_conn_param conn_param = { .initiator_depth = 2, | |
2347 | .retry_count = 5, | |
2348 | .private_data = &cap, | |
2349 | .private_data_len = sizeof(cap), | |
2350 | }; | |
2351 | struct rdma_cm_event *cm_event; | |
2352 | int ret; | |
2353 | ||
2354 | /* | |
2355 | * Only negotiate the capability with destination if the user | |
2356 | * on the source first requested the capability. | |
2357 | */ | |
2358 | if (rdma->pin_all) { | |
733252de | 2359 | trace_qemu_rdma_connect_pin_all_requested(); |
2da776db MH |
2360 | cap.flags |= RDMA_CAPABILITY_PIN_ALL; |
2361 | } | |
2362 | ||
2363 | caps_to_network(&cap); | |
2364 | ||
2365 | ret = rdma_connect(rdma->cm_id, &conn_param); | |
2366 | if (ret) { | |
2367 | perror("rdma_connect"); | |
66988941 | 2368 | ERROR(errp, "connecting to destination!"); |
2da776db MH |
2369 | goto err_rdma_source_connect; |
2370 | } | |
2371 | ||
2372 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
2373 | if (ret) { | |
2374 | perror("rdma_get_cm_event after rdma_connect"); | |
66988941 | 2375 | ERROR(errp, "connecting to destination!"); |
2da776db | 2376 | rdma_ack_cm_event(cm_event); |
2da776db MH |
2377 | goto err_rdma_source_connect; |
2378 | } | |
2379 | ||
2380 | if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) { | |
2381 | perror("rdma_get_cm_event != EVENT_ESTABLISHED after rdma_connect"); | |
66988941 | 2382 | ERROR(errp, "connecting to destination!"); |
2da776db | 2383 | rdma_ack_cm_event(cm_event); |
2da776db MH |
2384 | goto err_rdma_source_connect; |
2385 | } | |
5a91337c | 2386 | rdma->connected = true; |
2da776db MH |
2387 | |
2388 | memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap)); | |
2389 | network_to_caps(&cap); | |
2390 | ||
2391 | /* | |
2392 | * Verify that the *requested* capabilities are supported by the destination | |
2393 | * and disable them otherwise. | |
2394 | */ | |
2395 | if (rdma->pin_all && !(cap.flags & RDMA_CAPABILITY_PIN_ALL)) { | |
2396 | ERROR(errp, "Server cannot support pinning all memory. " | |
66988941 | 2397 | "Will register memory dynamically."); |
2da776db MH |
2398 | rdma->pin_all = false; |
2399 | } | |
2400 | ||
733252de | 2401 | trace_qemu_rdma_connect_pin_all_outcome(rdma->pin_all); |
2da776db MH |
2402 | |
2403 | rdma_ack_cm_event(cm_event); | |
2404 | ||
87772639 | 2405 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); |
2da776db | 2406 | if (ret) { |
66988941 | 2407 | ERROR(errp, "posting second control recv!"); |
2da776db MH |
2408 | goto err_rdma_source_connect; |
2409 | } | |
2410 | ||
2411 | rdma->control_ready_expected = 1; | |
2412 | rdma->nb_sent = 0; | |
2413 | return 0; | |
2414 | ||
2415 | err_rdma_source_connect: | |
2416 | qemu_rdma_cleanup(rdma); | |
2417 | return -1; | |
2418 | } | |
2419 | ||
2420 | static int qemu_rdma_dest_init(RDMAContext *rdma, Error **errp) | |
2421 | { | |
1dbd2fd9 | 2422 | int ret, idx; |
2da776db MH |
2423 | struct rdma_cm_id *listen_id; |
2424 | char ip[40] = "unknown"; | |
1dbd2fd9 | 2425 | struct rdma_addrinfo *res, *e; |
b58c8552 | 2426 | char port_str[16]; |
2da776db | 2427 | |
1f22364b | 2428 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
2429 | rdma->wr_data[idx].control_len = 0; |
2430 | rdma->wr_data[idx].control_curr = NULL; | |
2431 | } | |
2432 | ||
1dbd2fd9 | 2433 | if (!rdma->host || !rdma->host[0]) { |
66988941 | 2434 | ERROR(errp, "RDMA host is not set!"); |
2da776db MH |
2435 | rdma->error_state = -EINVAL; |
2436 | return -1; | |
2437 | } | |
2438 | /* create CM channel */ | |
2439 | rdma->channel = rdma_create_event_channel(); | |
2440 | if (!rdma->channel) { | |
66988941 | 2441 | ERROR(errp, "could not create rdma event channel"); |
2da776db MH |
2442 | rdma->error_state = -EINVAL; |
2443 | return -1; | |
2444 | } | |
2445 | ||
2446 | /* create CM id */ | |
2447 | ret = rdma_create_id(rdma->channel, &listen_id, NULL, RDMA_PS_TCP); | |
2448 | if (ret) { | |
66988941 | 2449 | ERROR(errp, "could not create cm_id!"); |
2da776db MH |
2450 | goto err_dest_init_create_listen_id; |
2451 | } | |
2452 | ||
b58c8552 MH |
2453 | snprintf(port_str, 16, "%d", rdma->port); |
2454 | port_str[15] = '\0'; | |
2da776db | 2455 | |
1dbd2fd9 MT |
2456 | ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res); |
2457 | if (ret < 0) { | |
2458 | ERROR(errp, "could not rdma_getaddrinfo address %s", rdma->host); | |
2459 | goto err_dest_init_bind_addr; | |
2460 | } | |
6470215b | 2461 | |
1dbd2fd9 MT |
2462 | for (e = res; e != NULL; e = e->ai_next) { |
2463 | inet_ntop(e->ai_family, | |
2464 | &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip); | |
2465 | trace_qemu_rdma_dest_init_trying(rdma->host, ip); | |
2466 | ret = rdma_bind_addr(listen_id, e->ai_dst_addr); | |
2467 | if (ret) { | |
2468 | continue; | |
2da776db | 2469 | } |
1dbd2fd9 MT |
2470 | if (e->ai_family == AF_INET6) { |
2471 | ret = qemu_rdma_broken_ipv6_kernel(errp, listen_id->verbs); | |
2472 | if (ret) { | |
2473 | continue; | |
6470215b MH |
2474 | } |
2475 | } | |
1dbd2fd9 MT |
2476 | break; |
2477 | } | |
b58c8552 | 2478 | |
1dbd2fd9 | 2479 | if (!e) { |
6470215b MH |
2480 | ERROR(errp, "Error: could not rdma_bind_addr!"); |
2481 | goto err_dest_init_bind_addr; | |
2da776db | 2482 | } |
2da776db MH |
2483 | |
2484 | rdma->listen_id = listen_id; | |
2485 | qemu_rdma_dump_gid("dest_init", listen_id); | |
2486 | return 0; | |
2487 | ||
2488 | err_dest_init_bind_addr: | |
2489 | rdma_destroy_id(listen_id); | |
2490 | err_dest_init_create_listen_id: | |
2491 | rdma_destroy_event_channel(rdma->channel); | |
2492 | rdma->channel = NULL; | |
2493 | rdma->error_state = ret; | |
2494 | return ret; | |
2495 | ||
2496 | } | |
2497 | ||
2498 | static void *qemu_rdma_data_init(const char *host_port, Error **errp) | |
2499 | { | |
2500 | RDMAContext *rdma = NULL; | |
2501 | InetSocketAddress *addr; | |
2502 | ||
2503 | if (host_port) { | |
97f3ad35 | 2504 | rdma = g_new0(RDMAContext, 1); |
2da776db MH |
2505 | rdma->current_index = -1; |
2506 | rdma->current_chunk = -1; | |
2507 | ||
2508 | addr = inet_parse(host_port, NULL); | |
2509 | if (addr != NULL) { | |
2510 | rdma->port = atoi(addr->port); | |
2511 | rdma->host = g_strdup(addr->host); | |
2512 | } else { | |
2513 | ERROR(errp, "bad RDMA migration address '%s'", host_port); | |
2514 | g_free(rdma); | |
e325b49a | 2515 | rdma = NULL; |
2da776db | 2516 | } |
e325b49a MH |
2517 | |
2518 | qapi_free_InetSocketAddress(addr); | |
2da776db MH |
2519 | } |
2520 | ||
2521 | return rdma; | |
2522 | } | |
2523 | ||
2524 | /* | |
2525 | * QEMUFile interface to the control channel. | |
2526 | * SEND messages for control only. | |
971ae6ef | 2527 | * VM's ram is handled with regular RDMA messages. |
2da776db | 2528 | */ |
6ddd2d76 DB |
2529 | static ssize_t qio_channel_rdma_writev(QIOChannel *ioc, |
2530 | const struct iovec *iov, | |
2531 | size_t niov, | |
2532 | int *fds, | |
2533 | size_t nfds, | |
2534 | Error **errp) | |
2535 | { | |
2536 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
2537 | QEMUFile *f = rioc->file; | |
2538 | RDMAContext *rdma = rioc->rdma; | |
2da776db | 2539 | int ret; |
6ddd2d76 DB |
2540 | ssize_t done = 0; |
2541 | size_t i; | |
2da776db MH |
2542 | |
2543 | CHECK_ERROR_STATE(); | |
2544 | ||
2545 | /* | |
2546 | * Push out any writes that | |
971ae6ef | 2547 | * we're queued up for VM's ram. |
2da776db MH |
2548 | */ |
2549 | ret = qemu_rdma_write_flush(f, rdma); | |
2550 | if (ret < 0) { | |
2551 | rdma->error_state = ret; | |
2552 | return ret; | |
2553 | } | |
2554 | ||
6ddd2d76 DB |
2555 | for (i = 0; i < niov; i++) { |
2556 | size_t remaining = iov[i].iov_len; | |
2557 | uint8_t * data = (void *)iov[i].iov_base; | |
2558 | while (remaining) { | |
2559 | RDMAControlHeader head; | |
2da776db | 2560 | |
6ddd2d76 DB |
2561 | rioc->len = MIN(remaining, RDMA_SEND_INCREMENT); |
2562 | remaining -= rioc->len; | |
2da776db | 2563 | |
6ddd2d76 DB |
2564 | head.len = rioc->len; |
2565 | head.type = RDMA_CONTROL_QEMU_FILE; | |
2da776db | 2566 | |
6ddd2d76 | 2567 | ret = qemu_rdma_exchange_send(rdma, &head, data, NULL, NULL, NULL); |
2da776db | 2568 | |
6ddd2d76 DB |
2569 | if (ret < 0) { |
2570 | rdma->error_state = ret; | |
2571 | return ret; | |
2572 | } | |
2da776db | 2573 | |
6ddd2d76 DB |
2574 | data += rioc->len; |
2575 | done += rioc->len; | |
2576 | } | |
2da776db MH |
2577 | } |
2578 | ||
6ddd2d76 | 2579 | return done; |
2da776db MH |
2580 | } |
2581 | ||
2582 | static size_t qemu_rdma_fill(RDMAContext *rdma, uint8_t *buf, | |
a202a4c0 | 2583 | size_t size, int idx) |
2da776db MH |
2584 | { |
2585 | size_t len = 0; | |
2586 | ||
2587 | if (rdma->wr_data[idx].control_len) { | |
733252de | 2588 | trace_qemu_rdma_fill(rdma->wr_data[idx].control_len, size); |
2da776db MH |
2589 | |
2590 | len = MIN(size, rdma->wr_data[idx].control_len); | |
2591 | memcpy(buf, rdma->wr_data[idx].control_curr, len); | |
2592 | rdma->wr_data[idx].control_curr += len; | |
2593 | rdma->wr_data[idx].control_len -= len; | |
2594 | } | |
2595 | ||
2596 | return len; | |
2597 | } | |
2598 | ||
2599 | /* | |
2600 | * QEMUFile interface to the control channel. | |
2601 | * RDMA links don't use bytestreams, so we have to | |
2602 | * return bytes to QEMUFile opportunistically. | |
2603 | */ | |
6ddd2d76 DB |
2604 | static ssize_t qio_channel_rdma_readv(QIOChannel *ioc, |
2605 | const struct iovec *iov, | |
2606 | size_t niov, | |
2607 | int **fds, | |
2608 | size_t *nfds, | |
2609 | Error **errp) | |
2610 | { | |
2611 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
2612 | RDMAContext *rdma = rioc->rdma; | |
2da776db MH |
2613 | RDMAControlHeader head; |
2614 | int ret = 0; | |
6ddd2d76 DB |
2615 | ssize_t i; |
2616 | size_t done = 0; | |
2da776db MH |
2617 | |
2618 | CHECK_ERROR_STATE(); | |
2619 | ||
6ddd2d76 DB |
2620 | for (i = 0; i < niov; i++) { |
2621 | size_t want = iov[i].iov_len; | |
2622 | uint8_t *data = (void *)iov[i].iov_base; | |
2da776db | 2623 | |
6ddd2d76 DB |
2624 | /* |
2625 | * First, we hold on to the last SEND message we | |
2626 | * were given and dish out the bytes until we run | |
2627 | * out of bytes. | |
2628 | */ | |
2629 | ret = qemu_rdma_fill(rioc->rdma, data, want, 0); | |
2630 | done += ret; | |
2631 | want -= ret; | |
2632 | /* Got what we needed, so go to next iovec */ | |
2633 | if (want == 0) { | |
2634 | continue; | |
2635 | } | |
2da776db | 2636 | |
6ddd2d76 DB |
2637 | /* If we got any data so far, then don't wait |
2638 | * for more, just return what we have */ | |
2639 | if (done > 0) { | |
2640 | break; | |
2641 | } | |
2da776db | 2642 | |
6ddd2d76 DB |
2643 | |
2644 | /* We've got nothing at all, so lets wait for | |
2645 | * more to arrive | |
2646 | */ | |
2647 | ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_QEMU_FILE); | |
2648 | ||
2649 | if (ret < 0) { | |
2650 | rdma->error_state = ret; | |
2651 | return ret; | |
2652 | } | |
2653 | ||
2654 | /* | |
2655 | * SEND was received with new bytes, now try again. | |
2656 | */ | |
2657 | ret = qemu_rdma_fill(rioc->rdma, data, want, 0); | |
2658 | done += ret; | |
2659 | want -= ret; | |
2660 | ||
2661 | /* Still didn't get enough, so lets just return */ | |
2662 | if (want) { | |
2663 | if (done == 0) { | |
2664 | return QIO_CHANNEL_ERR_BLOCK; | |
2665 | } else { | |
2666 | break; | |
2667 | } | |
2668 | } | |
2669 | } | |
2670 | rioc->len = done; | |
2671 | return rioc->len; | |
2da776db MH |
2672 | } |
2673 | ||
2674 | /* | |
2675 | * Block until all the outstanding chunks have been delivered by the hardware. | |
2676 | */ | |
2677 | static int qemu_rdma_drain_cq(QEMUFile *f, RDMAContext *rdma) | |
2678 | { | |
2679 | int ret; | |
2680 | ||
2681 | if (qemu_rdma_write_flush(f, rdma) < 0) { | |
2682 | return -EIO; | |
2683 | } | |
2684 | ||
2685 | while (rdma->nb_sent) { | |
88571882 | 2686 | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE, NULL); |
2da776db | 2687 | if (ret < 0) { |
733252de | 2688 | error_report("rdma migration: complete polling error!"); |
2da776db MH |
2689 | return -EIO; |
2690 | } | |
2691 | } | |
2692 | ||
2693 | qemu_rdma_unregister_waiting(rdma); | |
2694 | ||
2695 | return 0; | |
2696 | } | |
2697 | ||
6ddd2d76 DB |
2698 | |
2699 | static int qio_channel_rdma_set_blocking(QIOChannel *ioc, | |
2700 | bool blocking, | |
2701 | Error **errp) | |
2702 | { | |
2703 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
2704 | /* XXX we should make readv/writev actually honour this :-) */ | |
2705 | rioc->blocking = blocking; | |
2706 | return 0; | |
2707 | } | |
2708 | ||
2709 | ||
2710 | typedef struct QIOChannelRDMASource QIOChannelRDMASource; | |
2711 | struct QIOChannelRDMASource { | |
2712 | GSource parent; | |
2713 | QIOChannelRDMA *rioc; | |
2714 | GIOCondition condition; | |
2715 | }; | |
2716 | ||
2717 | static gboolean | |
2718 | qio_channel_rdma_source_prepare(GSource *source, | |
2719 | gint *timeout) | |
2720 | { | |
2721 | QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; | |
2722 | RDMAContext *rdma = rsource->rioc->rdma; | |
2723 | GIOCondition cond = 0; | |
2724 | *timeout = -1; | |
2725 | ||
2726 | if (rdma->wr_data[0].control_len) { | |
2727 | cond |= G_IO_IN; | |
2728 | } | |
2729 | cond |= G_IO_OUT; | |
2730 | ||
2731 | return cond & rsource->condition; | |
2732 | } | |
2733 | ||
2734 | static gboolean | |
2735 | qio_channel_rdma_source_check(GSource *source) | |
2736 | { | |
2737 | QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; | |
2738 | RDMAContext *rdma = rsource->rioc->rdma; | |
2739 | GIOCondition cond = 0; | |
2740 | ||
2741 | if (rdma->wr_data[0].control_len) { | |
2742 | cond |= G_IO_IN; | |
2743 | } | |
2744 | cond |= G_IO_OUT; | |
2745 | ||
2746 | return cond & rsource->condition; | |
2747 | } | |
2748 | ||
2749 | static gboolean | |
2750 | qio_channel_rdma_source_dispatch(GSource *source, | |
2751 | GSourceFunc callback, | |
2752 | gpointer user_data) | |
2753 | { | |
2754 | QIOChannelFunc func = (QIOChannelFunc)callback; | |
2755 | QIOChannelRDMASource *rsource = (QIOChannelRDMASource *)source; | |
2756 | RDMAContext *rdma = rsource->rioc->rdma; | |
2757 | GIOCondition cond = 0; | |
2758 | ||
2759 | if (rdma->wr_data[0].control_len) { | |
2760 | cond |= G_IO_IN; | |
2761 | } | |
2762 | cond |= G_IO_OUT; | |
2763 | ||
2764 | return (*func)(QIO_CHANNEL(rsource->rioc), | |
2765 | (cond & rsource->condition), | |
2766 | user_data); | |
2767 | } | |
2768 | ||
2769 | static void | |
2770 | qio_channel_rdma_source_finalize(GSource *source) | |
2771 | { | |
2772 | QIOChannelRDMASource *ssource = (QIOChannelRDMASource *)source; | |
2773 | ||
2774 | object_unref(OBJECT(ssource->rioc)); | |
2775 | } | |
2776 | ||
2777 | GSourceFuncs qio_channel_rdma_source_funcs = { | |
2778 | qio_channel_rdma_source_prepare, | |
2779 | qio_channel_rdma_source_check, | |
2780 | qio_channel_rdma_source_dispatch, | |
2781 | qio_channel_rdma_source_finalize | |
2782 | }; | |
2783 | ||
2784 | static GSource *qio_channel_rdma_create_watch(QIOChannel *ioc, | |
2785 | GIOCondition condition) | |
2da776db | 2786 | { |
6ddd2d76 DB |
2787 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); |
2788 | QIOChannelRDMASource *ssource; | |
2789 | GSource *source; | |
2790 | ||
2791 | source = g_source_new(&qio_channel_rdma_source_funcs, | |
2792 | sizeof(QIOChannelRDMASource)); | |
2793 | ssource = (QIOChannelRDMASource *)source; | |
2794 | ||
2795 | ssource->rioc = rioc; | |
2796 | object_ref(OBJECT(rioc)); | |
2797 | ||
2798 | ssource->condition = condition; | |
2799 | ||
2800 | return source; | |
2801 | } | |
2802 | ||
2803 | ||
2804 | static int qio_channel_rdma_close(QIOChannel *ioc, | |
2805 | Error **errp) | |
2806 | { | |
2807 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); | |
733252de | 2808 | trace_qemu_rdma_close(); |
6ddd2d76 DB |
2809 | if (rioc->rdma) { |
2810 | qemu_rdma_cleanup(rioc->rdma); | |
2811 | g_free(rioc->rdma); | |
2812 | rioc->rdma = NULL; | |
2da776db | 2813 | } |
2da776db MH |
2814 | return 0; |
2815 | } | |
2816 | ||
2817 | /* | |
2818 | * Parameters: | |
2819 | * @offset == 0 : | |
2820 | * This means that 'block_offset' is a full virtual address that does not | |
2821 | * belong to a RAMBlock of the virtual machine and instead | |
2822 | * represents a private malloc'd memory area that the caller wishes to | |
2823 | * transfer. | |
2824 | * | |
2825 | * @offset != 0 : | |
2826 | * Offset is an offset to be added to block_offset and used | |
2827 | * to also lookup the corresponding RAMBlock. | |
2828 | * | |
2829 | * @size > 0 : | |
2830 | * Initiate an transfer this size. | |
2831 | * | |
2832 | * @size == 0 : | |
2833 | * A 'hint' or 'advice' that means that we wish to speculatively | |
2834 | * and asynchronously unregister this memory. In this case, there is no | |
52f35022 | 2835 | * guarantee that the unregister will actually happen, for example, |
2da776db MH |
2836 | * if the memory is being actively transmitted. Additionally, the memory |
2837 | * may be re-registered at any future time if a write within the same | |
2838 | * chunk was requested again, even if you attempted to unregister it | |
2839 | * here. | |
2840 | * | |
2841 | * @size < 0 : TODO, not yet supported | |
2842 | * Unregister the memory NOW. This means that the caller does not | |
2843 | * expect there to be any future RDMA transfers and we just want to clean | |
2844 | * things up. This is used in case the upper layer owns the memory and | |
2845 | * cannot wait for qemu_fclose() to occur. | |
2846 | * | |
2847 | * @bytes_sent : User-specificed pointer to indicate how many bytes were | |
2848 | * sent. Usually, this will not be more than a few bytes of | |
2849 | * the protocol because most transfers are sent asynchronously. | |
2850 | */ | |
2851 | static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque, | |
2852 | ram_addr_t block_offset, ram_addr_t offset, | |
6e1dea46 | 2853 | size_t size, uint64_t *bytes_sent) |
2da776db | 2854 | { |
6ddd2d76 DB |
2855 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); |
2856 | RDMAContext *rdma = rioc->rdma; | |
2da776db MH |
2857 | int ret; |
2858 | ||
2859 | CHECK_ERROR_STATE(); | |
2860 | ||
2861 | qemu_fflush(f); | |
2862 | ||
2863 | if (size > 0) { | |
2864 | /* | |
2865 | * Add this page to the current 'chunk'. If the chunk | |
2866 | * is full, or the page doen't belong to the current chunk, | |
2867 | * an actual RDMA write will occur and a new chunk will be formed. | |
2868 | */ | |
2869 | ret = qemu_rdma_write(f, rdma, block_offset, offset, size); | |
2870 | if (ret < 0) { | |
733252de | 2871 | error_report("rdma migration: write error! %d", ret); |
2da776db MH |
2872 | goto err; |
2873 | } | |
2874 | ||
2875 | /* | |
2876 | * We always return 1 bytes because the RDMA | |
2877 | * protocol is completely asynchronous. We do not yet know | |
2878 | * whether an identified chunk is zero or not because we're | |
2879 | * waiting for other pages to potentially be merged with | |
2880 | * the current chunk. So, we have to call qemu_update_position() | |
2881 | * later on when the actual write occurs. | |
2882 | */ | |
2883 | if (bytes_sent) { | |
2884 | *bytes_sent = 1; | |
2885 | } | |
2886 | } else { | |
2887 | uint64_t index, chunk; | |
2888 | ||
2889 | /* TODO: Change QEMUFileOps prototype to be signed: size_t => long | |
2890 | if (size < 0) { | |
2891 | ret = qemu_rdma_drain_cq(f, rdma); | |
2892 | if (ret < 0) { | |
2893 | fprintf(stderr, "rdma: failed to synchronously drain" | |
2894 | " completion queue before unregistration.\n"); | |
2895 | goto err; | |
2896 | } | |
2897 | } | |
2898 | */ | |
2899 | ||
2900 | ret = qemu_rdma_search_ram_block(rdma, block_offset, | |
2901 | offset, size, &index, &chunk); | |
2902 | ||
2903 | if (ret) { | |
733252de | 2904 | error_report("ram block search failed"); |
2da776db MH |
2905 | goto err; |
2906 | } | |
2907 | ||
2908 | qemu_rdma_signal_unregister(rdma, index, chunk, 0); | |
2909 | ||
2910 | /* | |
52f35022 | 2911 | * TODO: Synchronous, guaranteed unregistration (should not occur during |
2da776db MH |
2912 | * fast-path). Otherwise, unregisters will process on the next call to |
2913 | * qemu_rdma_drain_cq() | |
2914 | if (size < 0) { | |
2915 | qemu_rdma_unregister_waiting(rdma); | |
2916 | } | |
2917 | */ | |
2918 | } | |
2919 | ||
2920 | /* | |
2921 | * Drain the Completion Queue if possible, but do not block, | |
2922 | * just poll. | |
2923 | * | |
2924 | * If nothing to poll, the end of the iteration will do this | |
2925 | * again to make sure we don't overflow the request queue. | |
2926 | */ | |
2927 | while (1) { | |
2928 | uint64_t wr_id, wr_id_in; | |
88571882 | 2929 | int ret = qemu_rdma_poll(rdma, &wr_id_in, NULL); |
2da776db | 2930 | if (ret < 0) { |
733252de | 2931 | error_report("rdma migration: polling error! %d", ret); |
2da776db MH |
2932 | goto err; |
2933 | } | |
2934 | ||
2935 | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; | |
2936 | ||
2937 | if (wr_id == RDMA_WRID_NONE) { | |
2938 | break; | |
2939 | } | |
2940 | } | |
2941 | ||
2942 | return RAM_SAVE_CONTROL_DELAYED; | |
2943 | err: | |
2944 | rdma->error_state = ret; | |
2945 | return ret; | |
2946 | } | |
2947 | ||
2948 | static int qemu_rdma_accept(RDMAContext *rdma) | |
2949 | { | |
2950 | RDMACapabilities cap; | |
2951 | struct rdma_conn_param conn_param = { | |
2952 | .responder_resources = 2, | |
2953 | .private_data = &cap, | |
2954 | .private_data_len = sizeof(cap), | |
2955 | }; | |
2956 | struct rdma_cm_event *cm_event; | |
2957 | struct ibv_context *verbs; | |
2958 | int ret = -EINVAL; | |
2959 | int idx; | |
2960 | ||
2961 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
2962 | if (ret) { | |
2963 | goto err_rdma_dest_wait; | |
2964 | } | |
2965 | ||
2966 | if (cm_event->event != RDMA_CM_EVENT_CONNECT_REQUEST) { | |
2967 | rdma_ack_cm_event(cm_event); | |
2968 | goto err_rdma_dest_wait; | |
2969 | } | |
2970 | ||
2971 | memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap)); | |
2972 | ||
2973 | network_to_caps(&cap); | |
2974 | ||
2975 | if (cap.version < 1 || cap.version > RDMA_CONTROL_VERSION_CURRENT) { | |
733252de | 2976 | error_report("Unknown source RDMA version: %d, bailing...", |
2da776db MH |
2977 | cap.version); |
2978 | rdma_ack_cm_event(cm_event); | |
2979 | goto err_rdma_dest_wait; | |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * Respond with only the capabilities this version of QEMU knows about. | |
2984 | */ | |
2985 | cap.flags &= known_capabilities; | |
2986 | ||
2987 | /* | |
2988 | * Enable the ones that we do know about. | |
2989 | * Add other checks here as new ones are introduced. | |
2990 | */ | |
2991 | if (cap.flags & RDMA_CAPABILITY_PIN_ALL) { | |
2992 | rdma->pin_all = true; | |
2993 | } | |
2994 | ||
2995 | rdma->cm_id = cm_event->id; | |
2996 | verbs = cm_event->id->verbs; | |
2997 | ||
2998 | rdma_ack_cm_event(cm_event); | |
2999 | ||
733252de | 3000 | trace_qemu_rdma_accept_pin_state(rdma->pin_all); |
2da776db MH |
3001 | |
3002 | caps_to_network(&cap); | |
3003 | ||
733252de | 3004 | trace_qemu_rdma_accept_pin_verbsc(verbs); |
2da776db MH |
3005 | |
3006 | if (!rdma->verbs) { | |
3007 | rdma->verbs = verbs; | |
3008 | } else if (rdma->verbs != verbs) { | |
733252de DDAG |
3009 | error_report("ibv context not matching %p, %p!", rdma->verbs, |
3010 | verbs); | |
2da776db MH |
3011 | goto err_rdma_dest_wait; |
3012 | } | |
3013 | ||
3014 | qemu_rdma_dump_id("dest_init", verbs); | |
3015 | ||
3016 | ret = qemu_rdma_alloc_pd_cq(rdma); | |
3017 | if (ret) { | |
733252de | 3018 | error_report("rdma migration: error allocating pd and cq!"); |
2da776db MH |
3019 | goto err_rdma_dest_wait; |
3020 | } | |
3021 | ||
3022 | ret = qemu_rdma_alloc_qp(rdma); | |
3023 | if (ret) { | |
733252de | 3024 | error_report("rdma migration: error allocating qp!"); |
2da776db MH |
3025 | goto err_rdma_dest_wait; |
3026 | } | |
3027 | ||
3028 | ret = qemu_rdma_init_ram_blocks(rdma); | |
3029 | if (ret) { | |
733252de | 3030 | error_report("rdma migration: error initializing ram blocks!"); |
2da776db MH |
3031 | goto err_rdma_dest_wait; |
3032 | } | |
3033 | ||
1f22364b | 3034 | for (idx = 0; idx < RDMA_WRID_MAX; idx++) { |
2da776db MH |
3035 | ret = qemu_rdma_reg_control(rdma, idx); |
3036 | if (ret) { | |
733252de | 3037 | error_report("rdma: error registering %d control", idx); |
2da776db MH |
3038 | goto err_rdma_dest_wait; |
3039 | } | |
3040 | } | |
3041 | ||
82e1cc4b | 3042 | qemu_set_fd_handler(rdma->channel->fd, NULL, NULL, NULL); |
2da776db MH |
3043 | |
3044 | ret = rdma_accept(rdma->cm_id, &conn_param); | |
3045 | if (ret) { | |
733252de | 3046 | error_report("rdma_accept returns %d", ret); |
2da776db MH |
3047 | goto err_rdma_dest_wait; |
3048 | } | |
3049 | ||
3050 | ret = rdma_get_cm_event(rdma->channel, &cm_event); | |
3051 | if (ret) { | |
733252de | 3052 | error_report("rdma_accept get_cm_event failed %d", ret); |
2da776db MH |
3053 | goto err_rdma_dest_wait; |
3054 | } | |
3055 | ||
3056 | if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) { | |
733252de | 3057 | error_report("rdma_accept not event established"); |
2da776db MH |
3058 | rdma_ack_cm_event(cm_event); |
3059 | goto err_rdma_dest_wait; | |
3060 | } | |
3061 | ||
3062 | rdma_ack_cm_event(cm_event); | |
5a91337c | 3063 | rdma->connected = true; |
2da776db | 3064 | |
87772639 | 3065 | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); |
2da776db | 3066 | if (ret) { |
733252de | 3067 | error_report("rdma migration: error posting second control recv"); |
2da776db MH |
3068 | goto err_rdma_dest_wait; |
3069 | } | |
3070 | ||
3071 | qemu_rdma_dump_gid("dest_connect", rdma->cm_id); | |
3072 | ||
3073 | return 0; | |
3074 | ||
3075 | err_rdma_dest_wait: | |
3076 | rdma->error_state = ret; | |
3077 | qemu_rdma_cleanup(rdma); | |
3078 | return ret; | |
3079 | } | |
3080 | ||
e4d63320 DDAG |
3081 | static int dest_ram_sort_func(const void *a, const void *b) |
3082 | { | |
3083 | unsigned int a_index = ((const RDMALocalBlock *)a)->src_index; | |
3084 | unsigned int b_index = ((const RDMALocalBlock *)b)->src_index; | |
3085 | ||
3086 | return (a_index < b_index) ? -1 : (a_index != b_index); | |
3087 | } | |
3088 | ||
2da776db MH |
3089 | /* |
3090 | * During each iteration of the migration, we listen for instructions | |
3091 | * by the source VM to perform dynamic page registrations before they | |
3092 | * can perform RDMA operations. | |
3093 | * | |
3094 | * We respond with the 'rkey'. | |
3095 | * | |
3096 | * Keep doing this until the source tells us to stop. | |
3097 | */ | |
632e3a5c | 3098 | static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque) |
2da776db MH |
3099 | { |
3100 | RDMAControlHeader reg_resp = { .len = sizeof(RDMARegisterResult), | |
3101 | .type = RDMA_CONTROL_REGISTER_RESULT, | |
3102 | .repeat = 0, | |
3103 | }; | |
3104 | RDMAControlHeader unreg_resp = { .len = 0, | |
3105 | .type = RDMA_CONTROL_UNREGISTER_FINISHED, | |
3106 | .repeat = 0, | |
3107 | }; | |
3108 | RDMAControlHeader blocks = { .type = RDMA_CONTROL_RAM_BLOCKS_RESULT, | |
3109 | .repeat = 1 }; | |
6ddd2d76 DB |
3110 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); |
3111 | RDMAContext *rdma = rioc->rdma; | |
2da776db MH |
3112 | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
3113 | RDMAControlHeader head; | |
3114 | RDMARegister *reg, *registers; | |
3115 | RDMACompress *comp; | |
3116 | RDMARegisterResult *reg_result; | |
3117 | static RDMARegisterResult results[RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE]; | |
3118 | RDMALocalBlock *block; | |
3119 | void *host_addr; | |
3120 | int ret = 0; | |
3121 | int idx = 0; | |
3122 | int count = 0; | |
3123 | int i = 0; | |
3124 | ||
3125 | CHECK_ERROR_STATE(); | |
3126 | ||
3127 | do { | |
632e3a5c | 3128 | trace_qemu_rdma_registration_handle_wait(); |
2da776db MH |
3129 | |
3130 | ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_NONE); | |
3131 | ||
3132 | if (ret < 0) { | |
3133 | break; | |
3134 | } | |
3135 | ||
3136 | if (head.repeat > RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE) { | |
733252de DDAG |
3137 | error_report("rdma: Too many requests in this message (%d)." |
3138 | "Bailing.", head.repeat); | |
2da776db MH |
3139 | ret = -EIO; |
3140 | break; | |
3141 | } | |
3142 | ||
3143 | switch (head.type) { | |
3144 | case RDMA_CONTROL_COMPRESS: | |
3145 | comp = (RDMACompress *) rdma->wr_data[idx].control_curr; | |
3146 | network_to_compress(comp); | |
3147 | ||
733252de DDAG |
3148 | trace_qemu_rdma_registration_handle_compress(comp->length, |
3149 | comp->block_idx, | |
3150 | comp->offset); | |
afcddefd DDAG |
3151 | if (comp->block_idx >= rdma->local_ram_blocks.nb_blocks) { |
3152 | error_report("rdma: 'compress' bad block index %u (vs %d)", | |
3153 | (unsigned int)comp->block_idx, | |
3154 | rdma->local_ram_blocks.nb_blocks); | |
3155 | ret = -EIO; | |
24b41d66 | 3156 | goto out; |
afcddefd | 3157 | } |
2da776db MH |
3158 | block = &(rdma->local_ram_blocks.block[comp->block_idx]); |
3159 | ||
3160 | host_addr = block->local_host_addr + | |
3161 | (comp->offset - block->offset); | |
3162 | ||
3163 | ram_handle_compressed(host_addr, comp->value, comp->length); | |
3164 | break; | |
3165 | ||
3166 | case RDMA_CONTROL_REGISTER_FINISHED: | |
733252de | 3167 | trace_qemu_rdma_registration_handle_finished(); |
2da776db MH |
3168 | goto out; |
3169 | ||
3170 | case RDMA_CONTROL_RAM_BLOCKS_REQUEST: | |
733252de | 3171 | trace_qemu_rdma_registration_handle_ram_blocks(); |
2da776db | 3172 | |
e4d63320 DDAG |
3173 | /* Sort our local RAM Block list so it's the same as the source, |
3174 | * we can do this since we've filled in a src_index in the list | |
3175 | * as we received the RAMBlock list earlier. | |
3176 | */ | |
3177 | qsort(rdma->local_ram_blocks.block, | |
3178 | rdma->local_ram_blocks.nb_blocks, | |
3179 | sizeof(RDMALocalBlock), dest_ram_sort_func); | |
2da776db MH |
3180 | if (rdma->pin_all) { |
3181 | ret = qemu_rdma_reg_whole_ram_blocks(rdma); | |
3182 | if (ret) { | |
733252de DDAG |
3183 | error_report("rdma migration: error dest " |
3184 | "registering ram blocks"); | |
2da776db MH |
3185 | goto out; |
3186 | } | |
3187 | } | |
3188 | ||
3189 | /* | |
3190 | * Dest uses this to prepare to transmit the RAMBlock descriptions | |
3191 | * to the source VM after connection setup. | |
3192 | * Both sides use the "remote" structure to communicate and update | |
3193 | * their "local" descriptions with what was sent. | |
3194 | */ | |
3195 | for (i = 0; i < local->nb_blocks; i++) { | |
a97270ad | 3196 | rdma->dest_blocks[i].remote_host_addr = |
fbce8c25 | 3197 | (uintptr_t)(local->block[i].local_host_addr); |
2da776db MH |
3198 | |
3199 | if (rdma->pin_all) { | |
a97270ad | 3200 | rdma->dest_blocks[i].remote_rkey = local->block[i].mr->rkey; |
2da776db MH |
3201 | } |
3202 | ||
a97270ad DDAG |
3203 | rdma->dest_blocks[i].offset = local->block[i].offset; |
3204 | rdma->dest_blocks[i].length = local->block[i].length; | |
2da776db | 3205 | |
a97270ad | 3206 | dest_block_to_network(&rdma->dest_blocks[i]); |
e4d63320 DDAG |
3207 | trace_qemu_rdma_registration_handle_ram_blocks_loop( |
3208 | local->block[i].block_name, | |
3209 | local->block[i].offset, | |
3210 | local->block[i].length, | |
3211 | local->block[i].local_host_addr, | |
3212 | local->block[i].src_index); | |
2da776db MH |
3213 | } |
3214 | ||
3215 | blocks.len = rdma->local_ram_blocks.nb_blocks | |
a97270ad | 3216 | * sizeof(RDMADestBlock); |
2da776db MH |
3217 | |
3218 | ||
3219 | ret = qemu_rdma_post_send_control(rdma, | |
a97270ad | 3220 | (uint8_t *) rdma->dest_blocks, &blocks); |
2da776db MH |
3221 | |
3222 | if (ret < 0) { | |
733252de | 3223 | error_report("rdma migration: error sending remote info"); |
2da776db MH |
3224 | goto out; |
3225 | } | |
3226 | ||
3227 | break; | |
3228 | case RDMA_CONTROL_REGISTER_REQUEST: | |
733252de | 3229 | trace_qemu_rdma_registration_handle_register(head.repeat); |
2da776db MH |
3230 | |
3231 | reg_resp.repeat = head.repeat; | |
3232 | registers = (RDMARegister *) rdma->wr_data[idx].control_curr; | |
3233 | ||
3234 | for (count = 0; count < head.repeat; count++) { | |
3235 | uint64_t chunk; | |
3236 | uint8_t *chunk_start, *chunk_end; | |
3237 | ||
3238 | reg = ®isters[count]; | |
3239 | network_to_register(reg); | |
3240 | ||
3241 | reg_result = &results[count]; | |
3242 | ||
733252de | 3243 | trace_qemu_rdma_registration_handle_register_loop(count, |
2da776db MH |
3244 | reg->current_index, reg->key.current_addr, reg->chunks); |
3245 | ||
afcddefd DDAG |
3246 | if (reg->current_index >= rdma->local_ram_blocks.nb_blocks) { |
3247 | error_report("rdma: 'register' bad block index %u (vs %d)", | |
3248 | (unsigned int)reg->current_index, | |
3249 | rdma->local_ram_blocks.nb_blocks); | |
3250 | ret = -ENOENT; | |
24b41d66 | 3251 | goto out; |
afcddefd | 3252 | } |
2da776db MH |
3253 | block = &(rdma->local_ram_blocks.block[reg->current_index]); |
3254 | if (block->is_ram_block) { | |
afcddefd DDAG |
3255 | if (block->offset > reg->key.current_addr) { |
3256 | error_report("rdma: bad register address for block %s" | |
3257 | " offset: %" PRIx64 " current_addr: %" PRIx64, | |
3258 | block->block_name, block->offset, | |
3259 | reg->key.current_addr); | |
3260 | ret = -ERANGE; | |
24b41d66 | 3261 | goto out; |
afcddefd | 3262 | } |
2da776db MH |
3263 | host_addr = (block->local_host_addr + |
3264 | (reg->key.current_addr - block->offset)); | |
3265 | chunk = ram_chunk_index(block->local_host_addr, | |
3266 | (uint8_t *) host_addr); | |
3267 | } else { | |
3268 | chunk = reg->key.chunk; | |
3269 | host_addr = block->local_host_addr + | |
3270 | (reg->key.chunk * (1UL << RDMA_REG_CHUNK_SHIFT)); | |
afcddefd DDAG |
3271 | /* Check for particularly bad chunk value */ |
3272 | if (host_addr < (void *)block->local_host_addr) { | |
3273 | error_report("rdma: bad chunk for block %s" | |
3274 | " chunk: %" PRIx64, | |
3275 | block->block_name, reg->key.chunk); | |
3276 | ret = -ERANGE; | |
24b41d66 | 3277 | goto out; |
afcddefd | 3278 | } |
2da776db MH |
3279 | } |
3280 | chunk_start = ram_chunk_start(block, chunk); | |
3281 | chunk_end = ram_chunk_end(block, chunk + reg->chunks); | |
3282 | if (qemu_rdma_register_and_get_keys(rdma, block, | |
3ac040c0 | 3283 | (uintptr_t)host_addr, NULL, ®_result->rkey, |
2da776db | 3284 | chunk, chunk_start, chunk_end)) { |
733252de | 3285 | error_report("cannot get rkey"); |
2da776db MH |
3286 | ret = -EINVAL; |
3287 | goto out; | |
3288 | } | |
3289 | ||
fbce8c25 | 3290 | reg_result->host_addr = (uintptr_t)block->local_host_addr; |
2da776db | 3291 | |
733252de DDAG |
3292 | trace_qemu_rdma_registration_handle_register_rkey( |
3293 | reg_result->rkey); | |
2da776db MH |
3294 | |
3295 | result_to_network(reg_result); | |
3296 | } | |
3297 | ||
3298 | ret = qemu_rdma_post_send_control(rdma, | |
3299 | (uint8_t *) results, ®_resp); | |
3300 | ||
3301 | if (ret < 0) { | |
733252de | 3302 | error_report("Failed to send control buffer"); |
2da776db MH |
3303 | goto out; |
3304 | } | |
3305 | break; | |
3306 | case RDMA_CONTROL_UNREGISTER_REQUEST: | |
733252de | 3307 | trace_qemu_rdma_registration_handle_unregister(head.repeat); |
2da776db MH |
3308 | unreg_resp.repeat = head.repeat; |
3309 | registers = (RDMARegister *) rdma->wr_data[idx].control_curr; | |
3310 | ||
3311 | for (count = 0; count < head.repeat; count++) { | |
3312 | reg = ®isters[count]; | |
3313 | network_to_register(reg); | |
3314 | ||
733252de DDAG |
3315 | trace_qemu_rdma_registration_handle_unregister_loop(count, |
3316 | reg->current_index, reg->key.chunk); | |
2da776db MH |
3317 | |
3318 | block = &(rdma->local_ram_blocks.block[reg->current_index]); | |
3319 | ||
3320 | ret = ibv_dereg_mr(block->pmr[reg->key.chunk]); | |
3321 | block->pmr[reg->key.chunk] = NULL; | |
3322 | ||
3323 | if (ret != 0) { | |
3324 | perror("rdma unregistration chunk failed"); | |
3325 | ret = -ret; | |
3326 | goto out; | |
3327 | } | |
3328 | ||
3329 | rdma->total_registrations--; | |
3330 | ||
733252de DDAG |
3331 | trace_qemu_rdma_registration_handle_unregister_success( |
3332 | reg->key.chunk); | |
2da776db MH |
3333 | } |
3334 | ||
3335 | ret = qemu_rdma_post_send_control(rdma, NULL, &unreg_resp); | |
3336 | ||
3337 | if (ret < 0) { | |
733252de | 3338 | error_report("Failed to send control buffer"); |
2da776db MH |
3339 | goto out; |
3340 | } | |
3341 | break; | |
3342 | case RDMA_CONTROL_REGISTER_RESULT: | |
733252de | 3343 | error_report("Invalid RESULT message at dest."); |
2da776db MH |
3344 | ret = -EIO; |
3345 | goto out; | |
3346 | default: | |
733252de | 3347 | error_report("Unknown control message %s", control_desc[head.type]); |
2da776db MH |
3348 | ret = -EIO; |
3349 | goto out; | |
3350 | } | |
3351 | } while (1); | |
3352 | out: | |
3353 | if (ret < 0) { | |
3354 | rdma->error_state = ret; | |
3355 | } | |
3356 | return ret; | |
3357 | } | |
3358 | ||
e4d63320 DDAG |
3359 | /* Destination: |
3360 | * Called via a ram_control_load_hook during the initial RAM load section which | |
3361 | * lists the RAMBlocks by name. This lets us know the order of the RAMBlocks | |
3362 | * on the source. | |
3363 | * We've already built our local RAMBlock list, but not yet sent the list to | |
3364 | * the source. | |
3365 | */ | |
6ddd2d76 DB |
3366 | static int |
3367 | rdma_block_notification_handle(QIOChannelRDMA *rioc, const char *name) | |
e4d63320 | 3368 | { |
6ddd2d76 | 3369 | RDMAContext *rdma = rioc->rdma; |
e4d63320 DDAG |
3370 | int curr; |
3371 | int found = -1; | |
3372 | ||
3373 | /* Find the matching RAMBlock in our local list */ | |
3374 | for (curr = 0; curr < rdma->local_ram_blocks.nb_blocks; curr++) { | |
3375 | if (!strcmp(rdma->local_ram_blocks.block[curr].block_name, name)) { | |
3376 | found = curr; | |
3377 | break; | |
3378 | } | |
3379 | } | |
3380 | ||
3381 | if (found == -1) { | |
3382 | error_report("RAMBlock '%s' not found on destination", name); | |
3383 | return -ENOENT; | |
3384 | } | |
3385 | ||
3386 | rdma->local_ram_blocks.block[curr].src_index = rdma->next_src_index; | |
3387 | trace_rdma_block_notification_handle(name, rdma->next_src_index); | |
3388 | rdma->next_src_index++; | |
3389 | ||
3390 | return 0; | |
3391 | } | |
3392 | ||
632e3a5c DDAG |
3393 | static int rdma_load_hook(QEMUFile *f, void *opaque, uint64_t flags, void *data) |
3394 | { | |
3395 | switch (flags) { | |
3396 | case RAM_CONTROL_BLOCK_REG: | |
e4d63320 | 3397 | return rdma_block_notification_handle(opaque, data); |
632e3a5c DDAG |
3398 | |
3399 | case RAM_CONTROL_HOOK: | |
3400 | return qemu_rdma_registration_handle(f, opaque); | |
3401 | ||
3402 | default: | |
3403 | /* Shouldn't be called with any other values */ | |
3404 | abort(); | |
3405 | } | |
3406 | } | |
3407 | ||
2da776db | 3408 | static int qemu_rdma_registration_start(QEMUFile *f, void *opaque, |
632e3a5c | 3409 | uint64_t flags, void *data) |
2da776db | 3410 | { |
6ddd2d76 DB |
3411 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); |
3412 | RDMAContext *rdma = rioc->rdma; | |
2da776db MH |
3413 | |
3414 | CHECK_ERROR_STATE(); | |
3415 | ||
733252de | 3416 | trace_qemu_rdma_registration_start(flags); |
2da776db MH |
3417 | qemu_put_be64(f, RAM_SAVE_FLAG_HOOK); |
3418 | qemu_fflush(f); | |
3419 | ||
3420 | return 0; | |
3421 | } | |
3422 | ||
3423 | /* | |
3424 | * Inform dest that dynamic registrations are done for now. | |
3425 | * First, flush writes, if any. | |
3426 | */ | |
3427 | static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, | |
632e3a5c | 3428 | uint64_t flags, void *data) |
2da776db MH |
3429 | { |
3430 | Error *local_err = NULL, **errp = &local_err; | |
6ddd2d76 DB |
3431 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); |
3432 | RDMAContext *rdma = rioc->rdma; | |
2da776db MH |
3433 | RDMAControlHeader head = { .len = 0, .repeat = 1 }; |
3434 | int ret = 0; | |
3435 | ||
3436 | CHECK_ERROR_STATE(); | |
3437 | ||
3438 | qemu_fflush(f); | |
3439 | ret = qemu_rdma_drain_cq(f, rdma); | |
3440 | ||
3441 | if (ret < 0) { | |
3442 | goto err; | |
3443 | } | |
3444 | ||
3445 | if (flags == RAM_CONTROL_SETUP) { | |
3446 | RDMAControlHeader resp = {.type = RDMA_CONTROL_RAM_BLOCKS_RESULT }; | |
3447 | RDMALocalBlocks *local = &rdma->local_ram_blocks; | |
e4d63320 | 3448 | int reg_result_idx, i, nb_dest_blocks; |
2da776db MH |
3449 | |
3450 | head.type = RDMA_CONTROL_RAM_BLOCKS_REQUEST; | |
733252de | 3451 | trace_qemu_rdma_registration_stop_ram(); |
2da776db MH |
3452 | |
3453 | /* | |
3454 | * Make sure that we parallelize the pinning on both sides. | |
3455 | * For very large guests, doing this serially takes a really | |
3456 | * long time, so we have to 'interleave' the pinning locally | |
3457 | * with the control messages by performing the pinning on this | |
3458 | * side before we receive the control response from the other | |
3459 | * side that the pinning has completed. | |
3460 | */ | |
3461 | ret = qemu_rdma_exchange_send(rdma, &head, NULL, &resp, | |
3462 | ®_result_idx, rdma->pin_all ? | |
3463 | qemu_rdma_reg_whole_ram_blocks : NULL); | |
3464 | if (ret < 0) { | |
66988941 | 3465 | ERROR(errp, "receiving remote info!"); |
2da776db MH |
3466 | return ret; |
3467 | } | |
3468 | ||
a97270ad | 3469 | nb_dest_blocks = resp.len / sizeof(RDMADestBlock); |
2da776db MH |
3470 | |
3471 | /* | |
3472 | * The protocol uses two different sets of rkeys (mutually exclusive): | |
3473 | * 1. One key to represent the virtual address of the entire ram block. | |
3474 | * (dynamic chunk registration disabled - pin everything with one rkey.) | |
3475 | * 2. One to represent individual chunks within a ram block. | |
3476 | * (dynamic chunk registration enabled - pin individual chunks.) | |
3477 | * | |
3478 | * Once the capability is successfully negotiated, the destination transmits | |
3479 | * the keys to use (or sends them later) including the virtual addresses | |
3480 | * and then propagates the remote ram block descriptions to his local copy. | |
3481 | */ | |
3482 | ||
a97270ad | 3483 | if (local->nb_blocks != nb_dest_blocks) { |
e4d63320 | 3484 | ERROR(errp, "ram blocks mismatch (Number of blocks %d vs %d) " |
2da776db | 3485 | "Your QEMU command line parameters are probably " |
e4d63320 DDAG |
3486 | "not identical on both the source and destination.", |
3487 | local->nb_blocks, nb_dest_blocks); | |
ef4b722d | 3488 | rdma->error_state = -EINVAL; |
2da776db MH |
3489 | return -EINVAL; |
3490 | } | |
3491 | ||
885e8f98 | 3492 | qemu_rdma_move_header(rdma, reg_result_idx, &resp); |
a97270ad | 3493 | memcpy(rdma->dest_blocks, |
885e8f98 | 3494 | rdma->wr_data[reg_result_idx].control_curr, resp.len); |
a97270ad DDAG |
3495 | for (i = 0; i < nb_dest_blocks; i++) { |
3496 | network_to_dest_block(&rdma->dest_blocks[i]); | |
2da776db | 3497 | |
e4d63320 DDAG |
3498 | /* We require that the blocks are in the same order */ |
3499 | if (rdma->dest_blocks[i].length != local->block[i].length) { | |
3500 | ERROR(errp, "Block %s/%d has a different length %" PRIu64 | |
3501 | "vs %" PRIu64, local->block[i].block_name, i, | |
3502 | local->block[i].length, | |
3503 | rdma->dest_blocks[i].length); | |
ef4b722d | 3504 | rdma->error_state = -EINVAL; |
2da776db MH |
3505 | return -EINVAL; |
3506 | } | |
e4d63320 DDAG |
3507 | local->block[i].remote_host_addr = |
3508 | rdma->dest_blocks[i].remote_host_addr; | |
3509 | local->block[i].remote_rkey = rdma->dest_blocks[i].remote_rkey; | |
2da776db MH |
3510 | } |
3511 | } | |
3512 | ||
733252de | 3513 | trace_qemu_rdma_registration_stop(flags); |
2da776db MH |
3514 | |
3515 | head.type = RDMA_CONTROL_REGISTER_FINISHED; | |
3516 | ret = qemu_rdma_exchange_send(rdma, &head, NULL, NULL, NULL, NULL); | |
3517 | ||
3518 | if (ret < 0) { | |
3519 | goto err; | |
3520 | } | |
3521 | ||
3522 | return 0; | |
3523 | err: | |
3524 | rdma->error_state = ret; | |
3525 | return ret; | |
3526 | } | |
3527 | ||
0436e09f | 3528 | static const QEMUFileHooks rdma_read_hooks = { |
632e3a5c | 3529 | .hook_ram_load = rdma_load_hook, |
2da776db MH |
3530 | }; |
3531 | ||
0436e09f | 3532 | static const QEMUFileHooks rdma_write_hooks = { |
2da776db MH |
3533 | .before_ram_iterate = qemu_rdma_registration_start, |
3534 | .after_ram_iterate = qemu_rdma_registration_stop, | |
3535 | .save_page = qemu_rdma_save_page, | |
3536 | }; | |
3537 | ||
6ddd2d76 DB |
3538 | |
3539 | static void qio_channel_rdma_finalize(Object *obj) | |
3540 | { | |
3541 | QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(obj); | |
3542 | if (rioc->rdma) { | |
3543 | qemu_rdma_cleanup(rioc->rdma); | |
3544 | g_free(rioc->rdma); | |
3545 | rioc->rdma = NULL; | |
3546 | } | |
3547 | } | |
3548 | ||
3549 | static void qio_channel_rdma_class_init(ObjectClass *klass, | |
3550 | void *class_data G_GNUC_UNUSED) | |
3551 | { | |
3552 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
3553 | ||
3554 | ioc_klass->io_writev = qio_channel_rdma_writev; | |
3555 | ioc_klass->io_readv = qio_channel_rdma_readv; | |
3556 | ioc_klass->io_set_blocking = qio_channel_rdma_set_blocking; | |
3557 | ioc_klass->io_close = qio_channel_rdma_close; | |
3558 | ioc_klass->io_create_watch = qio_channel_rdma_create_watch; | |
3559 | } | |
3560 | ||
3561 | static const TypeInfo qio_channel_rdma_info = { | |
3562 | .parent = TYPE_QIO_CHANNEL, | |
3563 | .name = TYPE_QIO_CHANNEL_RDMA, | |
3564 | .instance_size = sizeof(QIOChannelRDMA), | |
3565 | .instance_finalize = qio_channel_rdma_finalize, | |
3566 | .class_init = qio_channel_rdma_class_init, | |
3567 | }; | |
3568 | ||
3569 | static void qio_channel_rdma_register_types(void) | |
3570 | { | |
3571 | type_register_static(&qio_channel_rdma_info); | |
3572 | } | |
3573 | ||
3574 | type_init(qio_channel_rdma_register_types); | |
3575 | ||
3576 | static QEMUFile *qemu_fopen_rdma(RDMAContext *rdma, const char *mode) | |
2da776db | 3577 | { |
6ddd2d76 | 3578 | QIOChannelRDMA *rioc; |
2da776db MH |
3579 | |
3580 | if (qemu_file_mode_is_not_valid(mode)) { | |
3581 | return NULL; | |
3582 | } | |
3583 | ||
6ddd2d76 DB |
3584 | rioc = QIO_CHANNEL_RDMA(object_new(TYPE_QIO_CHANNEL_RDMA)); |
3585 | rioc->rdma = rdma; | |
2da776db MH |
3586 | |
3587 | if (mode[0] == 'w') { | |
6ddd2d76 DB |
3588 | rioc->file = qemu_fopen_channel_output(QIO_CHANNEL(rioc)); |
3589 | qemu_file_set_hooks(rioc->file, &rdma_write_hooks); | |
2da776db | 3590 | } else { |
6ddd2d76 DB |
3591 | rioc->file = qemu_fopen_channel_input(QIO_CHANNEL(rioc)); |
3592 | qemu_file_set_hooks(rioc->file, &rdma_read_hooks); | |
2da776db MH |
3593 | } |
3594 | ||
6ddd2d76 | 3595 | return rioc->file; |
2da776db MH |
3596 | } |
3597 | ||
3598 | static void rdma_accept_incoming_migration(void *opaque) | |
3599 | { | |
3600 | RDMAContext *rdma = opaque; | |
3601 | int ret; | |
3602 | QEMUFile *f; | |
3603 | Error *local_err = NULL, **errp = &local_err; | |
3604 | ||
24ec68ef | 3605 | trace_qemu_rdma_accept_incoming_migration(); |
2da776db MH |
3606 | ret = qemu_rdma_accept(rdma); |
3607 | ||
3608 | if (ret) { | |
66988941 | 3609 | ERROR(errp, "RDMA Migration initialization failed!"); |
2da776db MH |
3610 | return; |
3611 | } | |
3612 | ||
24ec68ef | 3613 | trace_qemu_rdma_accept_incoming_migration_accepted(); |
2da776db MH |
3614 | |
3615 | f = qemu_fopen_rdma(rdma, "rb"); | |
3616 | if (f == NULL) { | |
66988941 | 3617 | ERROR(errp, "could not qemu_fopen_rdma!"); |
2da776db MH |
3618 | qemu_rdma_cleanup(rdma); |
3619 | return; | |
3620 | } | |
3621 | ||
3622 | rdma->migration_started_on_destination = 1; | |
22724f49 | 3623 | migration_fd_process_incoming(f); |
2da776db MH |
3624 | } |
3625 | ||
3626 | void rdma_start_incoming_migration(const char *host_port, Error **errp) | |
3627 | { | |
3628 | int ret; | |
3629 | RDMAContext *rdma; | |
3630 | Error *local_err = NULL; | |
3631 | ||
733252de | 3632 | trace_rdma_start_incoming_migration(); |
2da776db MH |
3633 | rdma = qemu_rdma_data_init(host_port, &local_err); |
3634 | ||
3635 | if (rdma == NULL) { | |
3636 | goto err; | |
3637 | } | |
3638 | ||
3639 | ret = qemu_rdma_dest_init(rdma, &local_err); | |
3640 | ||
3641 | if (ret) { | |
3642 | goto err; | |
3643 | } | |
3644 | ||
733252de | 3645 | trace_rdma_start_incoming_migration_after_dest_init(); |
2da776db MH |
3646 | |
3647 | ret = rdma_listen(rdma->listen_id, 5); | |
3648 | ||
3649 | if (ret) { | |
66988941 | 3650 | ERROR(errp, "listening on socket!"); |
2da776db MH |
3651 | goto err; |
3652 | } | |
3653 | ||
733252de | 3654 | trace_rdma_start_incoming_migration_after_rdma_listen(); |
2da776db | 3655 | |
82e1cc4b FZ |
3656 | qemu_set_fd_handler(rdma->channel->fd, rdma_accept_incoming_migration, |
3657 | NULL, (void *)(intptr_t)rdma); | |
2da776db MH |
3658 | return; |
3659 | err: | |
3660 | error_propagate(errp, local_err); | |
3661 | g_free(rdma); | |
3662 | } | |
3663 | ||
3664 | void rdma_start_outgoing_migration(void *opaque, | |
3665 | const char *host_port, Error **errp) | |
3666 | { | |
3667 | MigrationState *s = opaque; | |
d59ce6f3 | 3668 | RDMAContext *rdma = qemu_rdma_data_init(host_port, errp); |
2da776db MH |
3669 | int ret = 0; |
3670 | ||
3671 | if (rdma == NULL) { | |
2da776db MH |
3672 | goto err; |
3673 | } | |
3674 | ||
d59ce6f3 | 3675 | ret = qemu_rdma_source_init(rdma, errp, |
41310c68 | 3676 | s->enabled_capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL]); |
2da776db MH |
3677 | |
3678 | if (ret) { | |
3679 | goto err; | |
3680 | } | |
3681 | ||
733252de | 3682 | trace_rdma_start_outgoing_migration_after_rdma_source_init(); |
d59ce6f3 | 3683 | ret = qemu_rdma_connect(rdma, errp); |
2da776db MH |
3684 | |
3685 | if (ret) { | |
3686 | goto err; | |
3687 | } | |
3688 | ||
733252de | 3689 | trace_rdma_start_outgoing_migration_after_rdma_connect(); |
2da776db | 3690 | |
89a02a9f | 3691 | s->to_dst_file = qemu_fopen_rdma(rdma, "wb"); |
2da776db MH |
3692 | migrate_fd_connect(s); |
3693 | return; | |
3694 | err: | |
2da776db | 3695 | g_free(rdma); |
2da776db | 3696 | } |