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39de8281 AG |
1 | #ifndef _RDS_RDS_H |
2 | #define _RDS_RDS_H | |
3 | ||
4 | #include <net/sock.h> | |
5 | #include <linux/scatterlist.h> | |
6 | #include <linux/highmem.h> | |
7 | #include <rdma/rdma_cm.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/rds.h> | |
7b565434 | 10 | #include <linux/rhashtable.h> |
39de8281 AG |
11 | |
12 | #include "info.h" | |
13 | ||
14 | /* | |
15 | * RDS Network protocol version | |
16 | */ | |
17 | #define RDS_PROTOCOL_3_0 0x0300 | |
18 | #define RDS_PROTOCOL_3_1 0x0301 | |
19 | #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 | |
20 | #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) | |
21 | #define RDS_PROTOCOL_MINOR(v) ((v) & 255) | |
22 | #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) | |
23 | ||
24 | /* | |
25 | * XXX randomly chosen, but at least seems to be unused: | |
26 | * # 18464-18768 Unassigned | |
27 | * We should do better. We want a reserved port to discourage unpriv'ed | |
28 | * userspace from listening. | |
29 | */ | |
30 | #define RDS_PORT 18634 | |
31 | ||
8cbd9606 AG |
32 | #ifdef ATOMIC64_INIT |
33 | #define KERNEL_HAS_ATOMIC64 | |
34 | #endif | |
35 | ||
ff57087f | 36 | #ifdef RDS_DEBUG |
39de8281 AG |
37 | #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) |
38 | #else | |
39 | /* sigh, pr_debug() causes unused variable warnings */ | |
b9075fa9 JP |
40 | static inline __printf(1, 2) |
41 | void rdsdebug(char *fmt, ...) | |
39de8281 AG |
42 | { |
43 | } | |
44 | #endif | |
45 | ||
46 | /* XXX is there one of these somewhere? */ | |
47 | #define ceil(x, y) \ | |
48 | ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) | |
49 | ||
50 | #define RDS_FRAG_SHIFT 12 | |
51 | #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) | |
52 | ||
f9fb69ad AR |
53 | /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ |
54 | #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) | |
55 | ||
39de8281 | 56 | #define RDS_CONG_MAP_BYTES (65536 / 8) |
39de8281 AG |
57 | #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) |
58 | #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) | |
59 | ||
60 | struct rds_cong_map { | |
61 | struct rb_node m_rb_node; | |
62 | __be32 m_addr; | |
63 | wait_queue_head_t m_waitq; | |
64 | struct list_head m_conn_list; | |
65 | unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; | |
66 | }; | |
67 | ||
68 | ||
69 | /* | |
70 | * This is how we will track the connection state: | |
71 | * A connection is always in one of the following | |
72 | * states. Updates to the state are atomic and imply | |
73 | * a memory barrier. | |
74 | */ | |
75 | enum { | |
76 | RDS_CONN_DOWN = 0, | |
77 | RDS_CONN_CONNECTING, | |
78 | RDS_CONN_DISCONNECTING, | |
79 | RDS_CONN_UP, | |
9c79440e | 80 | RDS_CONN_RESETTING, |
39de8281 AG |
81 | RDS_CONN_ERROR, |
82 | }; | |
83 | ||
84 | /* Bits for c_flags */ | |
85 | #define RDS_LL_SEND_FULL 0 | |
86 | #define RDS_RECONNECT_PENDING 1 | |
0f4b1c7e | 87 | #define RDS_IN_XMIT 2 |
73ce4317 | 88 | #define RDS_RECV_REFILL 3 |
39de8281 | 89 | |
0cb43965 | 90 | /* Max number of multipaths per RDS connection. Must be a power of 2 */ |
5916e2c1 SV |
91 | #define RDS_MPATH_WORKERS 8 |
92 | #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ | |
93 | (rs)->rs_hash_initval) & ((n) - 1)) | |
0cb43965 SV |
94 | |
95 | /* Per mpath connection state */ | |
96 | struct rds_conn_path { | |
97 | struct rds_connection *cp_conn; | |
98 | struct rds_message *cp_xmit_rm; | |
99 | unsigned long cp_xmit_sg; | |
100 | unsigned int cp_xmit_hdr_off; | |
101 | unsigned int cp_xmit_data_off; | |
102 | unsigned int cp_xmit_atomic_sent; | |
103 | unsigned int cp_xmit_rdma_sent; | |
104 | unsigned int cp_xmit_data_sent; | |
105 | ||
106 | spinlock_t cp_lock; /* protect msg queues */ | |
107 | u64 cp_next_tx_seq; | |
108 | struct list_head cp_send_queue; | |
109 | struct list_head cp_retrans; | |
110 | ||
111 | u64 cp_next_rx_seq; | |
112 | ||
113 | void *cp_transport_data; | |
114 | ||
115 | atomic_t cp_state; | |
116 | unsigned long cp_send_gen; | |
117 | unsigned long cp_flags; | |
118 | unsigned long cp_reconnect_jiffies; | |
119 | struct delayed_work cp_send_w; | |
120 | struct delayed_work cp_recv_w; | |
121 | struct delayed_work cp_conn_w; | |
122 | struct work_struct cp_down_w; | |
123 | struct mutex cp_cm_lock; /* protect cp_state & cm */ | |
124 | wait_queue_head_t cp_waitq; | |
125 | ||
126 | unsigned int cp_unacked_packets; | |
127 | unsigned int cp_unacked_bytes; | |
128 | unsigned int cp_outgoing:1, | |
129 | cp_pad_to_32:31; | |
130 | unsigned int cp_index; | |
131 | }; | |
132 | ||
133 | /* One rds_connection per RDS address pair */ | |
39de8281 AG |
134 | struct rds_connection { |
135 | struct hlist_node c_hash_node; | |
136 | __be32 c_laddr; | |
137 | __be32 c_faddr; | |
3b20fc38 | 138 | unsigned int c_loopback:1, |
5916e2c1 SV |
139 | c_ping_triggered:1, |
140 | c_pad_to_32:30; | |
0cb43965 | 141 | int c_npaths; |
39de8281 | 142 | struct rds_connection *c_passive; |
0cb43965 | 143 | struct rds_transport *c_trans; |
39de8281 AG |
144 | |
145 | struct rds_cong_map *c_lcong; | |
146 | struct rds_cong_map *c_fcong; | |
147 | ||
0cb43965 SV |
148 | /* Protocol version */ |
149 | unsigned int c_version; | |
8edc3aff | 150 | struct net *c_net; |
39de8281 AG |
151 | |
152 | struct list_head c_map_item; | |
153 | unsigned long c_map_queued; | |
39de8281 | 154 | |
0cb43965 | 155 | struct rds_conn_path c_path[RDS_MPATH_WORKERS]; |
5916e2c1 | 156 | wait_queue_head_t c_hs_waitq; /* handshake waitq */ |
905dd418 SV |
157 | |
158 | u32 c_my_gen_num; | |
159 | u32 c_peer_gen_num; | |
39de8281 AG |
160 | }; |
161 | ||
d5a8ac28 SV |
162 | static inline |
163 | struct net *rds_conn_net(struct rds_connection *conn) | |
164 | { | |
8edc3aff | 165 | return conn->c_net; |
d5a8ac28 SV |
166 | } |
167 | ||
168 | static inline | |
169 | void rds_conn_net_set(struct rds_connection *conn, struct net *net) | |
170 | { | |
8edc3aff | 171 | conn->c_net = get_net(net); |
d5a8ac28 SV |
172 | } |
173 | ||
39de8281 AG |
174 | #define RDS_FLAG_CONG_BITMAP 0x01 |
175 | #define RDS_FLAG_ACK_REQUIRED 0x02 | |
176 | #define RDS_FLAG_RETRANSMITTED 0x04 | |
7b70d033 | 177 | #define RDS_MAX_ADV_CREDIT 255 |
39de8281 | 178 | |
5916e2c1 SV |
179 | /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping |
180 | * probe to exchange control information before establishing a connection. | |
181 | * Currently the control information that is exchanged is the number of | |
182 | * supported paths. If the peer is a legacy (older kernel revision) peer, | |
183 | * it would return a pong message without additional control information | |
184 | * that would then alert the sender that the peer was an older rev. | |
185 | */ | |
186 | #define RDS_FLAG_PROBE_PORT 1 | |
187 | #define RDS_HS_PROBE(sport, dport) \ | |
188 | ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ | |
189 | (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) | |
39de8281 AG |
190 | /* |
191 | * Maximum space available for extension headers. | |
192 | */ | |
193 | #define RDS_HEADER_EXT_SPACE 16 | |
194 | ||
195 | struct rds_header { | |
196 | __be64 h_sequence; | |
197 | __be64 h_ack; | |
198 | __be32 h_len; | |
199 | __be16 h_sport; | |
200 | __be16 h_dport; | |
201 | u8 h_flags; | |
202 | u8 h_credit; | |
203 | u8 h_padding[4]; | |
204 | __sum16 h_csum; | |
205 | ||
206 | u8 h_exthdr[RDS_HEADER_EXT_SPACE]; | |
207 | }; | |
208 | ||
209 | /* | |
210 | * Reserved - indicates end of extensions | |
211 | */ | |
212 | #define RDS_EXTHDR_NONE 0 | |
213 | ||
214 | /* | |
215 | * This extension header is included in the very | |
216 | * first message that is sent on a new connection, | |
217 | * and identifies the protocol level. This will help | |
218 | * rolling updates if a future change requires breaking | |
219 | * the protocol. | |
220 | * NB: This is no longer true for IB, where we do a version | |
221 | * negotiation during the connection setup phase (protocol | |
222 | * version information is included in the RDMA CM private data). | |
223 | */ | |
224 | #define RDS_EXTHDR_VERSION 1 | |
225 | struct rds_ext_header_version { | |
226 | __be32 h_version; | |
227 | }; | |
228 | ||
229 | /* | |
230 | * This extension header is included in the RDS message | |
231 | * chasing an RDMA operation. | |
232 | */ | |
233 | #define RDS_EXTHDR_RDMA 2 | |
234 | struct rds_ext_header_rdma { | |
235 | __be32 h_rdma_rkey; | |
236 | }; | |
237 | ||
238 | /* | |
239 | * This extension header tells the peer about the | |
240 | * destination <R_Key,offset> of the requested RDMA | |
241 | * operation. | |
242 | */ | |
243 | #define RDS_EXTHDR_RDMA_DEST 3 | |
244 | struct rds_ext_header_rdma_dest { | |
245 | __be32 h_rdma_rkey; | |
246 | __be32 h_rdma_offset; | |
247 | }; | |
248 | ||
5916e2c1 SV |
249 | /* Extension header announcing number of paths. |
250 | * Implicit length = 2 bytes. | |
251 | */ | |
905dd418 SV |
252 | #define RDS_EXTHDR_NPATHS 5 |
253 | #define RDS_EXTHDR_GEN_NUM 6 | |
5916e2c1 | 254 | |
39de8281 | 255 | #define __RDS_EXTHDR_MAX 16 /* for now */ |
3289025a SS |
256 | #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) |
257 | #define RDS_MSG_RX_HDR 0 | |
258 | #define RDS_MSG_RX_START 1 | |
259 | #define RDS_MSG_RX_END 2 | |
260 | #define RDS_MSG_RX_CMSG 3 | |
39de8281 AG |
261 | |
262 | struct rds_incoming { | |
263 | atomic_t i_refcount; | |
264 | struct list_head i_item; | |
265 | struct rds_connection *i_conn; | |
ef9e62c2 | 266 | struct rds_conn_path *i_conn_path; |
39de8281 AG |
267 | struct rds_header i_hdr; |
268 | unsigned long i_rx_jiffies; | |
269 | __be32 i_saddr; | |
270 | ||
271 | rds_rdma_cookie_t i_rdma_cookie; | |
5711f8b3 | 272 | struct timeval i_rx_tstamp; |
3289025a | 273 | u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; |
39de8281 AG |
274 | }; |
275 | ||
21f79afa AG |
276 | struct rds_mr { |
277 | struct rb_node r_rb_node; | |
278 | atomic_t r_refcount; | |
279 | u32 r_key; | |
280 | ||
281 | /* A copy of the creation flags */ | |
282 | unsigned int r_use_once:1; | |
283 | unsigned int r_invalidate:1; | |
284 | unsigned int r_write:1; | |
285 | ||
286 | /* This is for RDS_MR_DEAD. | |
287 | * It would be nice & consistent to make this part of the above | |
288 | * bit field here, but we need to use test_and_set_bit. | |
289 | */ | |
290 | unsigned long r_state; | |
291 | struct rds_sock *r_sock; /* back pointer to the socket that owns us */ | |
292 | struct rds_transport *r_trans; | |
293 | void *r_trans_private; | |
294 | }; | |
295 | ||
296 | /* Flags for mr->r_state */ | |
297 | #define RDS_MR_DEAD 0 | |
298 | ||
21f79afa AG |
299 | static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) |
300 | { | |
301 | return r_key | (((u64) offset) << 32); | |
302 | } | |
303 | ||
304 | static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) | |
305 | { | |
306 | return cookie; | |
307 | } | |
308 | ||
309 | static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) | |
310 | { | |
311 | return cookie >> 32; | |
312 | } | |
313 | ||
15133f6e AG |
314 | /* atomic operation types */ |
315 | #define RDS_ATOMIC_TYPE_CSWP 0 | |
316 | #define RDS_ATOMIC_TYPE_FADD 1 | |
317 | ||
39de8281 AG |
318 | /* |
319 | * m_sock_item and m_conn_item are on lists that are serialized under | |
320 | * conn->c_lock. m_sock_item has additional meaning in that once it is empty | |
321 | * the message will not be put back on the retransmit list after being sent. | |
322 | * messages that are canceled while being sent rely on this. | |
323 | * | |
324 | * m_inc is used by loopback so that it can pass an incoming message straight | |
325 | * back up into the rx path. It embeds a wire header which is also used by | |
326 | * the send path, which is kind of awkward. | |
327 | * | |
328 | * m_sock_item indicates the message's presence on a socket's send or receive | |
329 | * queue. m_rs will point to that socket. | |
330 | * | |
331 | * m_daddr is used by cancellation to prune messages to a given destination. | |
332 | * | |
333 | * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock | |
334 | * nesting. As paths iterate over messages on a sock, or conn, they must | |
335 | * also lock the conn, or sock, to remove the message from those lists too. | |
336 | * Testing the flag to determine if the message is still on the lists lets | |
337 | * us avoid testing the list_head directly. That means each path can use | |
338 | * the message's list_head to keep it on a local list while juggling locks | |
339 | * without confusing the other path. | |
340 | * | |
341 | * m_ack_seq is an optional field set by transports who need a different | |
342 | * sequence number range to invalidate. They can use this in a callback | |
343 | * that they pass to rds_send_drop_acked() to see if each message has been | |
344 | * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't | |
345 | * had ack_seq set yet. | |
346 | */ | |
347 | #define RDS_MSG_ON_SOCK 1 | |
348 | #define RDS_MSG_ON_CONN 2 | |
349 | #define RDS_MSG_HAS_ACK_SEQ 3 | |
350 | #define RDS_MSG_ACK_REQUIRED 4 | |
351 | #define RDS_MSG_RETRANSMITTED 5 | |
352 | #define RDS_MSG_MAPPED 6 | |
353 | #define RDS_MSG_PAGEVEC 7 | |
905dd418 | 354 | #define RDS_MSG_FLUSH 8 |
39de8281 AG |
355 | |
356 | struct rds_message { | |
357 | atomic_t m_refcount; | |
358 | struct list_head m_sock_item; | |
359 | struct list_head m_conn_item; | |
360 | struct rds_incoming m_inc; | |
361 | u64 m_ack_seq; | |
362 | __be32 m_daddr; | |
363 | unsigned long m_flags; | |
364 | ||
365 | /* Never access m_rs without holding m_rs_lock. | |
366 | * Lock nesting is | |
367 | * rm->m_rs_lock | |
368 | * -> rs->rs_lock | |
369 | */ | |
370 | spinlock_t m_rs_lock; | |
c83188dc CM |
371 | wait_queue_head_t m_flush_wait; |
372 | ||
39de8281 | 373 | struct rds_sock *m_rs; |
7e3bd65e AG |
374 | |
375 | /* cookie to send to remote, in rds header */ | |
39de8281 | 376 | rds_rdma_cookie_t m_rdma_cookie; |
7e3bd65e AG |
377 | |
378 | unsigned int m_used_sgs; | |
379 | unsigned int m_total_sgs; | |
380 | ||
ff3d7d36 AG |
381 | void *m_final_op; |
382 | ||
e779137a | 383 | struct { |
15133f6e AG |
384 | struct rm_atomic_op { |
385 | int op_type; | |
20c72bd5 AG |
386 | union { |
387 | struct { | |
388 | uint64_t compare; | |
389 | uint64_t swap; | |
390 | uint64_t compare_mask; | |
391 | uint64_t swap_mask; | |
392 | } op_m_cswp; | |
393 | struct { | |
394 | uint64_t add; | |
395 | uint64_t nocarry_mask; | |
396 | } op_m_fadd; | |
397 | }; | |
15133f6e AG |
398 | |
399 | u32 op_rkey; | |
400 | u64 op_remote_addr; | |
401 | unsigned int op_notify:1; | |
402 | unsigned int op_recverr:1; | |
403 | unsigned int op_mapped:1; | |
2c3a5f9a | 404 | unsigned int op_silent:1; |
15133f6e | 405 | unsigned int op_active:1; |
15133f6e | 406 | struct scatterlist *op_sg; |
f8b3aaf2 | 407 | struct rds_notifier *op_notifier; |
15133f6e AG |
408 | |
409 | struct rds_mr *op_rdma_mr; | |
410 | } atomic; | |
411 | struct rm_rdma_op { | |
f8b3aaf2 AG |
412 | u32 op_rkey; |
413 | u64 op_remote_addr; | |
414 | unsigned int op_write:1; | |
415 | unsigned int op_fence:1; | |
416 | unsigned int op_notify:1; | |
417 | unsigned int op_recverr:1; | |
418 | unsigned int op_mapped:1; | |
2c3a5f9a | 419 | unsigned int op_silent:1; |
f8b3aaf2 AG |
420 | unsigned int op_active:1; |
421 | unsigned int op_bytes; | |
422 | unsigned int op_nents; | |
423 | unsigned int op_count; | |
424 | struct scatterlist *op_sg; | |
425 | struct rds_notifier *op_notifier; | |
426 | ||
427 | struct rds_mr *op_rdma_mr; | |
e779137a | 428 | } rdma; |
15133f6e | 429 | struct rm_data_op { |
241eef3e | 430 | unsigned int op_active:1; |
941f8d55 | 431 | unsigned int op_notify:1; |
6c7cc6e4 AG |
432 | unsigned int op_nents; |
433 | unsigned int op_count; | |
d655a9fb WW |
434 | unsigned int op_dmasg; |
435 | unsigned int op_dmaoff; | |
6c7cc6e4 | 436 | struct scatterlist *op_sg; |
e779137a AG |
437 | } data; |
438 | }; | |
39de8281 AG |
439 | }; |
440 | ||
441 | /* | |
442 | * The RDS notifier is used (optionally) to tell the application about | |
443 | * completed RDMA operations. Rather than keeping the whole rds message | |
444 | * around on the queue, we allocate a small notifier that is put on the | |
445 | * socket's notifier_list. Notifications are delivered to the application | |
446 | * through control messages. | |
447 | */ | |
448 | struct rds_notifier { | |
449 | struct list_head n_list; | |
450 | uint64_t n_user_token; | |
451 | int n_status; | |
452 | }; | |
453 | ||
454 | /** | |
455 | * struct rds_transport - transport specific behavioural hooks | |
456 | * | |
457 | * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send | |
458 | * part of a message. The caller serializes on the send_sem so this | |
459 | * doesn't need to be reentrant for a given conn. The header must be | |
460 | * sent before the data payload. .xmit must be prepared to send a | |
461 | * message with no data payload. .xmit should return the number of | |
462 | * bytes that were sent down the connection, including header bytes. | |
463 | * Returning 0 tells the caller that it doesn't need to perform any | |
464 | * additional work now. This is usually the case when the transport has | |
465 | * filled the sending queue for its connection and will handle | |
466 | * triggering the rds thread to continue the send when space becomes | |
467 | * available. Returning -EAGAIN tells the caller to retry the send | |
468 | * immediately. Returning -ENOMEM tells the caller to retry the send at | |
469 | * some point in the future. | |
470 | * | |
471 | * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once | |
472 | * it returns the connection can not call rds_recv_incoming(). | |
473 | * This will only be called once after conn_connect returns | |
474 | * non-zero success and will The caller serializes this with | |
475 | * the send and connecting paths (xmit_* and conn_*). The | |
476 | * transport is responsible for other serialization, including | |
477 | * rds_recv_incoming(). This is called in process context but | |
478 | * should try hard not to block. | |
39de8281 AG |
479 | */ |
480 | ||
481 | struct rds_transport { | |
482 | char t_name[TRANSNAMSIZ]; | |
483 | struct list_head t_item; | |
484 | struct module *t_owner; | |
7e8f4413 SV |
485 | unsigned int t_prefer_loopback:1, |
486 | t_mp_capable:1; | |
335776bd | 487 | unsigned int t_type; |
39de8281 | 488 | |
d5a8ac28 | 489 | int (*laddr_check)(struct net *net, __be32 addr); |
39de8281 AG |
490 | int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); |
491 | void (*conn_free)(void *data); | |
b04e8554 | 492 | int (*conn_path_connect)(struct rds_conn_path *cp); |
d769ef81 | 493 | void (*conn_path_shutdown)(struct rds_conn_path *conn); |
1f9ecd7e | 494 | void (*xmit_path_prepare)(struct rds_conn_path *cp); |
1f9ecd7e | 495 | void (*xmit_path_complete)(struct rds_conn_path *cp); |
39de8281 AG |
496 | int (*xmit)(struct rds_connection *conn, struct rds_message *rm, |
497 | unsigned int hdr_off, unsigned int sg, unsigned int off); | |
f8b3aaf2 | 498 | int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); |
ff3d7d36 | 499 | int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); |
2da43c4a | 500 | int (*recv_path)(struct rds_conn_path *cp); |
c310e72c | 501 | int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); |
39de8281 AG |
502 | void (*inc_free)(struct rds_incoming *inc); |
503 | ||
504 | int (*cm_handle_connect)(struct rdma_cm_id *cm_id, | |
505 | struct rdma_cm_event *event); | |
506 | int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); | |
507 | void (*cm_connect_complete)(struct rds_connection *conn, | |
508 | struct rdma_cm_event *event); | |
509 | ||
510 | unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, | |
511 | unsigned int avail); | |
512 | void (*exit)(void); | |
513 | void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, | |
514 | struct rds_sock *rs, u32 *key_ret); | |
515 | void (*sync_mr)(void *trans_private, int direction); | |
516 | void (*free_mr)(void *trans_private, int invalidate); | |
517 | void (*flush_mrs)(void); | |
518 | }; | |
519 | ||
520 | struct rds_sock { | |
521 | struct sock rs_sk; | |
522 | ||
523 | u64 rs_user_addr; | |
524 | u64 rs_user_bytes; | |
525 | ||
526 | /* | |
527 | * bound_addr used for both incoming and outgoing, no INADDR_ANY | |
528 | * support. | |
529 | */ | |
7b565434 | 530 | struct rhash_head rs_bound_node; |
531 | u64 rs_bound_key; | |
39de8281 AG |
532 | __be32 rs_bound_addr; |
533 | __be32 rs_conn_addr; | |
534 | __be16 rs_bound_port; | |
535 | __be16 rs_conn_port; | |
39de8281 AG |
536 | struct rds_transport *rs_transport; |
537 | ||
538 | /* | |
539 | * rds_sendmsg caches the conn it used the last time around. | |
540 | * This helps avoid costly lookups. | |
541 | */ | |
542 | struct rds_connection *rs_conn; | |
543 | ||
544 | /* flag indicating we were congested or not */ | |
545 | int rs_congested; | |
b98ba52f AG |
546 | /* seen congestion (ENOBUFS) when sending? */ |
547 | int rs_seen_congestion; | |
39de8281 AG |
548 | |
549 | /* rs_lock protects all these adjacent members before the newline */ | |
550 | spinlock_t rs_lock; | |
551 | struct list_head rs_send_queue; | |
552 | u32 rs_snd_bytes; | |
553 | int rs_rcv_bytes; | |
554 | struct list_head rs_notify_queue; /* currently used for failed RDMAs */ | |
555 | ||
556 | /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask | |
557 | * to decide whether the application should be woken up. | |
558 | * If not set, we use rs_cong_track to find out whether a cong map | |
559 | * update arrived. | |
560 | */ | |
561 | uint64_t rs_cong_mask; | |
562 | uint64_t rs_cong_notify; | |
563 | struct list_head rs_cong_list; | |
564 | unsigned long rs_cong_track; | |
565 | ||
566 | /* | |
567 | * rs_recv_lock protects the receive queue, and is | |
568 | * used to serialize with rds_release. | |
569 | */ | |
570 | rwlock_t rs_recv_lock; | |
571 | struct list_head rs_recv_queue; | |
572 | ||
573 | /* just for stats reporting */ | |
574 | struct list_head rs_item; | |
575 | ||
576 | /* these have their own lock */ | |
577 | spinlock_t rs_rdma_lock; | |
578 | struct rb_root rs_rdma_keys; | |
579 | ||
580 | /* Socket options - in case there will be more */ | |
581 | unsigned char rs_recverr, | |
582 | rs_cong_monitor; | |
5916e2c1 | 583 | u32 rs_hash_initval; |
3289025a SS |
584 | |
585 | /* Socket receive path trace points*/ | |
586 | u8 rs_rx_traces; | |
587 | u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; | |
39de8281 AG |
588 | }; |
589 | ||
590 | static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) | |
591 | { | |
592 | return container_of(sk, struct rds_sock, rs_sk); | |
593 | } | |
594 | static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) | |
595 | { | |
596 | return &rs->rs_sk; | |
597 | } | |
598 | ||
599 | /* | |
600 | * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value | |
601 | * to account for overhead. We don't account for overhead, we just apply | |
602 | * the number of payload bytes to the specified value. | |
603 | */ | |
604 | static inline int rds_sk_sndbuf(struct rds_sock *rs) | |
605 | { | |
606 | return rds_rs_to_sk(rs)->sk_sndbuf / 2; | |
607 | } | |
608 | static inline int rds_sk_rcvbuf(struct rds_sock *rs) | |
609 | { | |
610 | return rds_rs_to_sk(rs)->sk_rcvbuf / 2; | |
611 | } | |
612 | ||
613 | struct rds_statistics { | |
614 | uint64_t s_conn_reset; | |
615 | uint64_t s_recv_drop_bad_checksum; | |
616 | uint64_t s_recv_drop_old_seq; | |
617 | uint64_t s_recv_drop_no_sock; | |
618 | uint64_t s_recv_drop_dead_sock; | |
619 | uint64_t s_recv_deliver_raced; | |
620 | uint64_t s_recv_delivered; | |
621 | uint64_t s_recv_queued; | |
622 | uint64_t s_recv_immediate_retry; | |
623 | uint64_t s_recv_delayed_retry; | |
624 | uint64_t s_recv_ack_required; | |
625 | uint64_t s_recv_rdma_bytes; | |
626 | uint64_t s_recv_ping; | |
627 | uint64_t s_send_queue_empty; | |
628 | uint64_t s_send_queue_full; | |
049ee3f5 AG |
629 | uint64_t s_send_lock_contention; |
630 | uint64_t s_send_lock_queue_raced; | |
39de8281 AG |
631 | uint64_t s_send_immediate_retry; |
632 | uint64_t s_send_delayed_retry; | |
633 | uint64_t s_send_drop_acked; | |
634 | uint64_t s_send_ack_required; | |
635 | uint64_t s_send_queued; | |
636 | uint64_t s_send_rdma; | |
637 | uint64_t s_send_rdma_bytes; | |
638 | uint64_t s_send_pong; | |
639 | uint64_t s_page_remainder_hit; | |
640 | uint64_t s_page_remainder_miss; | |
641 | uint64_t s_copy_to_user; | |
642 | uint64_t s_copy_from_user; | |
643 | uint64_t s_cong_update_queued; | |
644 | uint64_t s_cong_update_received; | |
645 | uint64_t s_cong_send_error; | |
646 | uint64_t s_cong_send_blocked; | |
192a798f VV |
647 | uint64_t s_recv_bytes_added_to_socket; |
648 | uint64_t s_recv_bytes_removed_from_socket; | |
649 | ||
39de8281 AG |
650 | }; |
651 | ||
652 | /* af_rds.c */ | |
653 | void rds_sock_addref(struct rds_sock *rs); | |
654 | void rds_sock_put(struct rds_sock *rs); | |
655 | void rds_wake_sk_sleep(struct rds_sock *rs); | |
656 | static inline void __rds_wake_sk_sleep(struct sock *sk) | |
657 | { | |
aa395145 | 658 | wait_queue_head_t *waitq = sk_sleep(sk); |
39de8281 AG |
659 | |
660 | if (!sock_flag(sk, SOCK_DEAD) && waitq) | |
661 | wake_up(waitq); | |
662 | } | |
663 | extern wait_queue_head_t rds_poll_waitq; | |
664 | ||
665 | ||
666 | /* bind.c */ | |
667 | int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); | |
668 | void rds_remove_bound(struct rds_sock *rs); | |
669 | struct rds_sock *rds_find_bound(__be32 addr, __be16 port); | |
7b565434 | 670 | int rds_bind_lock_init(void); |
671 | void rds_bind_lock_destroy(void); | |
39de8281 AG |
672 | |
673 | /* cong.c */ | |
674 | int rds_cong_get_maps(struct rds_connection *conn); | |
675 | void rds_cong_add_conn(struct rds_connection *conn); | |
676 | void rds_cong_remove_conn(struct rds_connection *conn); | |
677 | void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); | |
678 | void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); | |
679 | int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); | |
680 | void rds_cong_queue_updates(struct rds_cong_map *map); | |
681 | void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); | |
682 | int rds_cong_updated_since(unsigned long *recent); | |
683 | void rds_cong_add_socket(struct rds_sock *); | |
684 | void rds_cong_remove_socket(struct rds_sock *); | |
685 | void rds_cong_exit(void); | |
686 | struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); | |
687 | ||
688 | /* conn.c */ | |
905dd418 | 689 | extern u32 rds_gen_num; |
ef87b7ea | 690 | int rds_conn_init(void); |
39de8281 | 691 | void rds_conn_exit(void); |
d5a8ac28 SV |
692 | struct rds_connection *rds_conn_create(struct net *net, |
693 | __be32 laddr, __be32 faddr, | |
39de8281 | 694 | struct rds_transport *trans, gfp_t gfp); |
d5a8ac28 SV |
695 | struct rds_connection *rds_conn_create_outgoing(struct net *net, |
696 | __be32 laddr, __be32 faddr, | |
39de8281 | 697 | struct rds_transport *trans, gfp_t gfp); |
d769ef81 | 698 | void rds_conn_shutdown(struct rds_conn_path *cpath); |
39de8281 | 699 | void rds_conn_destroy(struct rds_connection *conn); |
39de8281 | 700 | void rds_conn_drop(struct rds_connection *conn); |
0cb43965 | 701 | void rds_conn_path_drop(struct rds_conn_path *cpath); |
f3c6808d | 702 | void rds_conn_connect_if_down(struct rds_connection *conn); |
3c0a5900 | 703 | void rds_conn_path_connect_if_down(struct rds_conn_path *cp); |
39de8281 AG |
704 | void rds_for_each_conn_info(struct socket *sock, unsigned int len, |
705 | struct rds_info_iterator *iter, | |
706 | struct rds_info_lengths *lens, | |
707 | int (*visitor)(struct rds_connection *, void *), | |
708 | size_t item_len); | |
39de8281 | 709 | |
6cdaf03f | 710 | __printf(2, 3) |
fb1b3dc4 SV |
711 | void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); |
712 | #define rds_conn_path_error(cp, fmt...) \ | |
713 | __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) | |
714 | ||
0cb43965 SV |
715 | static inline int |
716 | rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) | |
717 | { | |
718 | return atomic_cmpxchg(&cp->cp_state, old, new) == old; | |
719 | } | |
720 | ||
39de8281 AG |
721 | static inline int |
722 | rds_conn_transition(struct rds_connection *conn, int old, int new) | |
723 | { | |
7e8f4413 | 724 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
725 | return rds_conn_path_transition(&conn->c_path[0], old, new); |
726 | } | |
727 | ||
728 | static inline int | |
729 | rds_conn_path_state(struct rds_conn_path *cp) | |
730 | { | |
731 | return atomic_read(&cp->cp_state); | |
39de8281 AG |
732 | } |
733 | ||
734 | static inline int | |
735 | rds_conn_state(struct rds_connection *conn) | |
736 | { | |
7e8f4413 | 737 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
738 | return rds_conn_path_state(&conn->c_path[0]); |
739 | } | |
740 | ||
741 | static inline int | |
742 | rds_conn_path_up(struct rds_conn_path *cp) | |
743 | { | |
744 | return atomic_read(&cp->cp_state) == RDS_CONN_UP; | |
39de8281 AG |
745 | } |
746 | ||
747 | static inline int | |
748 | rds_conn_up(struct rds_connection *conn) | |
749 | { | |
7e8f4413 | 750 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
751 | return rds_conn_path_up(&conn->c_path[0]); |
752 | } | |
753 | ||
754 | static inline int | |
755 | rds_conn_path_connecting(struct rds_conn_path *cp) | |
756 | { | |
757 | return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; | |
39de8281 AG |
758 | } |
759 | ||
760 | static inline int | |
761 | rds_conn_connecting(struct rds_connection *conn) | |
762 | { | |
7e8f4413 | 763 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 | 764 | return rds_conn_path_connecting(&conn->c_path[0]); |
39de8281 AG |
765 | } |
766 | ||
767 | /* message.c */ | |
768 | struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); | |
fc445084 | 769 | struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); |
083735f4 | 770 | int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); |
39de8281 AG |
771 | struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); |
772 | void rds_message_populate_header(struct rds_header *hdr, __be16 sport, | |
773 | __be16 dport, u64 seq); | |
774 | int rds_message_add_extension(struct rds_header *hdr, | |
775 | unsigned int type, const void *data, unsigned int len); | |
776 | int rds_message_next_extension(struct rds_header *hdr, | |
777 | unsigned int *pos, void *buf, unsigned int *buflen); | |
39de8281 | 778 | int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); |
c310e72c | 779 | int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); |
39de8281 AG |
780 | void rds_message_inc_free(struct rds_incoming *inc); |
781 | void rds_message_addref(struct rds_message *rm); | |
782 | void rds_message_put(struct rds_message *rm); | |
783 | void rds_message_wait(struct rds_message *rm); | |
784 | void rds_message_unmapped(struct rds_message *rm); | |
785 | ||
786 | static inline void rds_message_make_checksum(struct rds_header *hdr) | |
787 | { | |
788 | hdr->h_csum = 0; | |
789 | hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); | |
790 | } | |
791 | ||
792 | static inline int rds_message_verify_checksum(const struct rds_header *hdr) | |
793 | { | |
794 | return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; | |
795 | } | |
796 | ||
797 | ||
798 | /* page.c */ | |
799 | int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, | |
800 | gfp_t gfp); | |
39de8281 AG |
801 | void rds_page_exit(void); |
802 | ||
803 | /* recv.c */ | |
804 | void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, | |
805 | __be32 saddr); | |
5e833e02 SV |
806 | void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, |
807 | __be32 saddr); | |
39de8281 AG |
808 | void rds_inc_put(struct rds_incoming *inc); |
809 | void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, | |
6114eab5 | 810 | struct rds_incoming *inc, gfp_t gfp); |
1b784140 YX |
811 | int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
812 | int msg_flags); | |
39de8281 AG |
813 | void rds_clear_recv_queue(struct rds_sock *rs); |
814 | int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); | |
815 | void rds_inc_info_copy(struct rds_incoming *inc, | |
816 | struct rds_info_iterator *iter, | |
817 | __be32 saddr, __be32 daddr, int flip); | |
818 | ||
819 | /* send.c */ | |
1b784140 | 820 | int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); |
d769ef81 | 821 | void rds_send_path_reset(struct rds_conn_path *conn); |
1f9ecd7e | 822 | int rds_send_xmit(struct rds_conn_path *cp); |
39de8281 AG |
823 | struct sockaddr_in; |
824 | void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); | |
825 | typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); | |
826 | void rds_send_drop_acked(struct rds_connection *conn, u64 ack, | |
827 | is_acked_func is_acked); | |
5c3d274c SV |
828 | void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, |
829 | is_acked_func is_acked); | |
45997e9e | 830 | int rds_send_pong(struct rds_conn_path *cp, __be16 dport); |
39de8281 AG |
831 | |
832 | /* rdma.c */ | |
833 | void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); | |
21f79afa AG |
834 | int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); |
835 | int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); | |
836 | int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); | |
837 | void rds_rdma_drop_keys(struct rds_sock *rs); | |
838 | int rds_rdma_extra_size(struct rds_rdma_args *args); | |
839 | int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, | |
840 | struct cmsghdr *cmsg); | |
841 | int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, | |
842 | struct cmsghdr *cmsg); | |
843 | int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, | |
844 | struct cmsghdr *cmsg); | |
845 | int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, | |
846 | struct cmsghdr *cmsg); | |
f8b3aaf2 | 847 | void rds_rdma_free_op(struct rm_rdma_op *ro); |
d0ab25a8 | 848 | void rds_atomic_free_op(struct rm_atomic_op *ao); |
15133f6e AG |
849 | void rds_rdma_send_complete(struct rds_message *rm, int wc_status); |
850 | void rds_atomic_send_complete(struct rds_message *rm, int wc_status); | |
851 | int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, | |
852 | struct cmsghdr *cmsg); | |
21f79afa | 853 | |
c1b1203d | 854 | void __rds_put_mr_final(struct rds_mr *mr); |
21f79afa AG |
855 | static inline void rds_mr_put(struct rds_mr *mr) |
856 | { | |
857 | if (atomic_dec_and_test(&mr->r_refcount)) | |
858 | __rds_put_mr_final(mr); | |
859 | } | |
39de8281 AG |
860 | |
861 | /* stats.c */ | |
9b8de747 | 862 | DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); |
39de8281 AG |
863 | #define rds_stats_inc_which(which, member) do { \ |
864 | per_cpu(which, get_cpu()).member++; \ | |
865 | put_cpu(); \ | |
866 | } while (0) | |
867 | #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) | |
868 | #define rds_stats_add_which(which, member, count) do { \ | |
869 | per_cpu(which, get_cpu()).member += count; \ | |
870 | put_cpu(); \ | |
871 | } while (0) | |
872 | #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) | |
ef87b7ea | 873 | int rds_stats_init(void); |
39de8281 AG |
874 | void rds_stats_exit(void); |
875 | void rds_stats_info_copy(struct rds_info_iterator *iter, | |
36cbd3dc JE |
876 | uint64_t *values, const char *const *names, |
877 | size_t nr); | |
39de8281 AG |
878 | |
879 | /* sysctl.c */ | |
ef87b7ea | 880 | int rds_sysctl_init(void); |
39de8281 AG |
881 | void rds_sysctl_exit(void); |
882 | extern unsigned long rds_sysctl_sndbuf_min; | |
883 | extern unsigned long rds_sysctl_sndbuf_default; | |
884 | extern unsigned long rds_sysctl_sndbuf_max; | |
885 | extern unsigned long rds_sysctl_reconnect_min_jiffies; | |
886 | extern unsigned long rds_sysctl_reconnect_max_jiffies; | |
887 | extern unsigned int rds_sysctl_max_unacked_packets; | |
888 | extern unsigned int rds_sysctl_max_unacked_bytes; | |
889 | extern unsigned int rds_sysctl_ping_enable; | |
890 | extern unsigned long rds_sysctl_trace_flags; | |
891 | extern unsigned int rds_sysctl_trace_level; | |
892 | ||
893 | /* threads.c */ | |
ef87b7ea | 894 | int rds_threads_init(void); |
39de8281 AG |
895 | void rds_threads_exit(void); |
896 | extern struct workqueue_struct *rds_wq; | |
0cb43965 | 897 | void rds_queue_reconnect(struct rds_conn_path *cp); |
39de8281 AG |
898 | void rds_connect_worker(struct work_struct *); |
899 | void rds_shutdown_worker(struct work_struct *); | |
900 | void rds_send_worker(struct work_struct *); | |
901 | void rds_recv_worker(struct work_struct *); | |
0cb43965 | 902 | void rds_connect_path_complete(struct rds_conn_path *conn, int curr); |
39de8281 AG |
903 | void rds_connect_complete(struct rds_connection *conn); |
904 | ||
905 | /* transport.c */ | |
a8d63a53 | 906 | void rds_trans_register(struct rds_transport *trans); |
39de8281 | 907 | void rds_trans_unregister(struct rds_transport *trans); |
d5a8ac28 | 908 | struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); |
5adb5bc6 | 909 | void rds_trans_put(struct rds_transport *trans); |
39de8281 AG |
910 | unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, |
911 | unsigned int avail); | |
d97dac54 | 912 | struct rds_transport *rds_trans_get(int t_type); |
ef87b7ea | 913 | int rds_trans_init(void); |
39de8281 AG |
914 | void rds_trans_exit(void); |
915 | ||
916 | #endif |