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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e6727f39 UB |
2 | /* |
3 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
4 | * | |
5 | * Manage send buffer. | |
6 | * Producer: | |
7 | * Copy user space data into send buffer, if send buffer space available. | |
8 | * Consumer: | |
9 | * Trigger RDMA write into RMBE of peer and send CDC, if RMBE space available. | |
10 | * | |
11 | * Copyright IBM Corp. 2016 | |
12 | * | |
13 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
14 | */ | |
15 | ||
16 | #include <linux/net.h> | |
17 | #include <linux/rcupdate.h> | |
18 | #include <linux/workqueue.h> | |
c3edc401 IM |
19 | #include <linux/sched/signal.h> |
20 | ||
e6727f39 | 21 | #include <net/sock.h> |
01d2f7e2 | 22 | #include <net/tcp.h> |
e6727f39 UB |
23 | |
24 | #include "smc.h" | |
25 | #include "smc_wr.h" | |
26 | #include "smc_cdc.h" | |
5bc056d8 | 27 | #include "smc_close.h" |
be244f28 | 28 | #include "smc_ism.h" |
e6727f39 UB |
29 | #include "smc_tx.h" |
30 | ||
16297d14 | 31 | #define SMC_TX_WORK_DELAY 0 |
01d2f7e2 | 32 | #define SMC_TX_CORK_DELAY (HZ >> 2) /* 250 ms */ |
18e537cd | 33 | |
e6727f39 UB |
34 | /***************************** sndbuf producer *******************************/ |
35 | ||
36 | /* callback implementation for sk.sk_write_space() | |
de8474eb | 37 | * to wakeup sndbuf producers that blocked with smc_tx_wait(). |
e6727f39 UB |
38 | * called under sk_socket lock. |
39 | */ | |
40 | static void smc_tx_write_space(struct sock *sk) | |
41 | { | |
42 | struct socket *sock = sk->sk_socket; | |
43 | struct smc_sock *smc = smc_sk(sk); | |
44 | struct socket_wq *wq; | |
45 | ||
46 | /* similar to sk_stream_write_space */ | |
47 | if (atomic_read(&smc->conn.sndbuf_space) && sock) { | |
48 | clear_bit(SOCK_NOSPACE, &sock->flags); | |
49 | rcu_read_lock(); | |
50 | wq = rcu_dereference(sk->sk_wq); | |
51 | if (skwq_has_sleeper(wq)) | |
52 | wake_up_interruptible_poll(&wq->wait, | |
a9a08845 LT |
53 | EPOLLOUT | EPOLLWRNORM | |
54 | EPOLLWRBAND); | |
e6727f39 UB |
55 | if (wq && wq->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN)) |
56 | sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT); | |
57 | rcu_read_unlock(); | |
58 | } | |
59 | } | |
60 | ||
de8474eb | 61 | /* Wakeup sndbuf producers that blocked with smc_tx_wait(). |
e6727f39 UB |
62 | * Cf. tcp_data_snd_check()=>tcp_check_space()=>tcp_new_space(). |
63 | */ | |
64 | void smc_tx_sndbuf_nonfull(struct smc_sock *smc) | |
65 | { | |
66 | if (smc->sk.sk_socket && | |
67 | test_bit(SOCK_NOSPACE, &smc->sk.sk_socket->flags)) | |
68 | smc->sk.sk_write_space(&smc->sk); | |
69 | } | |
70 | ||
de8474eb SR |
71 | /* blocks sndbuf producer until at least one byte of free space available |
72 | * or urgent Byte was consumed | |
73 | */ | |
74 | static int smc_tx_wait(struct smc_sock *smc, int flags) | |
e6727f39 UB |
75 | { |
76 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
77 | struct smc_connection *conn = &smc->conn; | |
78 | struct sock *sk = &smc->sk; | |
e6727f39 UB |
79 | long timeo; |
80 | int rc = 0; | |
81 | ||
82 | /* similar to sk_stream_wait_memory */ | |
83 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
e6727f39 UB |
84 | add_wait_queue(sk_sleep(sk), &wait); |
85 | while (1) { | |
86 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
87 | if (sk->sk_err || | |
88 | (sk->sk_shutdown & SEND_SHUTDOWN) || | |
b2900980 | 89 | conn->killed || |
e6727f39 UB |
90 | conn->local_tx_ctrl.conn_state_flags.peer_done_writing) { |
91 | rc = -EPIPE; | |
92 | break; | |
93 | } | |
aa377e68 | 94 | if (smc_cdc_rxed_any_close(conn)) { |
e6727f39 UB |
95 | rc = -ECONNRESET; |
96 | break; | |
97 | } | |
98 | if (!timeo) { | |
4651d180 JB |
99 | /* ensure EPOLLOUT is subsequently generated */ |
100 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
e6727f39 UB |
101 | rc = -EAGAIN; |
102 | break; | |
103 | } | |
104 | if (signal_pending(current)) { | |
105 | rc = sock_intr_errno(timeo); | |
106 | break; | |
107 | } | |
108 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
de8474eb SR |
109 | if (atomic_read(&conn->sndbuf_space) && !conn->urg_tx_pend) |
110 | break; /* at least 1 byte of free & no urgent data */ | |
e6727f39 | 111 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
e6727f39 UB |
112 | sk_wait_event(sk, &timeo, |
113 | sk->sk_err || | |
114 | (sk->sk_shutdown & SEND_SHUTDOWN) || | |
aa377e68 | 115 | smc_cdc_rxed_any_close(conn) || |
de8474eb SR |
116 | (atomic_read(&conn->sndbuf_space) && |
117 | !conn->urg_tx_pend), | |
e6727f39 | 118 | &wait); |
e6727f39 UB |
119 | } |
120 | remove_wait_queue(sk_sleep(sk), &wait); | |
121 | return rc; | |
122 | } | |
123 | ||
01d2f7e2 UB |
124 | static bool smc_tx_is_corked(struct smc_sock *smc) |
125 | { | |
126 | struct tcp_sock *tp = tcp_sk(smc->clcsock->sk); | |
127 | ||
128 | return (tp->nonagle & TCP_NAGLE_CORK) ? true : false; | |
129 | } | |
130 | ||
e6727f39 UB |
131 | /* sndbuf producer: main API called by socket layer. |
132 | * called under sock lock. | |
133 | */ | |
134 | int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) | |
135 | { | |
136 | size_t copylen, send_done = 0, send_remaining = len; | |
137 | size_t chunk_len, chunk_off, chunk_len_sum; | |
138 | struct smc_connection *conn = &smc->conn; | |
139 | union smc_host_cursor prep; | |
140 | struct sock *sk = &smc->sk; | |
141 | char *sndbuf_base; | |
142 | int tx_cnt_prep; | |
143 | int writespace; | |
144 | int rc, chunk; | |
145 | ||
146 | /* This should be in poll */ | |
147 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
148 | ||
149 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) { | |
150 | rc = -EPIPE; | |
151 | goto out_err; | |
152 | } | |
153 | ||
154 | while (msg_data_left(msg)) { | |
155 | if (sk->sk_state == SMC_INIT) | |
156 | return -ENOTCONN; | |
157 | if (smc->sk.sk_shutdown & SEND_SHUTDOWN || | |
b38d7324 | 158 | (smc->sk.sk_err == ECONNABORTED) || |
b2900980 | 159 | conn->killed) |
e6727f39 UB |
160 | return -EPIPE; |
161 | if (smc_cdc_rxed_any_close(conn)) | |
162 | return send_done ?: -ECONNRESET; | |
163 | ||
de8474eb SR |
164 | if (msg->msg_flags & MSG_OOB) |
165 | conn->local_tx_ctrl.prod_flags.urg_data_pending = 1; | |
166 | ||
167 | if (!atomic_read(&conn->sndbuf_space) || conn->urg_tx_pend) { | |
6889b36d KG |
168 | if (send_done) |
169 | return send_done; | |
de8474eb | 170 | rc = smc_tx_wait(smc, msg->msg_flags); |
6889b36d | 171 | if (rc) |
e6727f39 | 172 | goto out_err; |
e6727f39 UB |
173 | continue; |
174 | } | |
175 | ||
176 | /* initialize variables for 1st iteration of subsequent loop */ | |
de8474eb | 177 | /* could be just 1 byte, even after smc_tx_wait above */ |
e6727f39 UB |
178 | writespace = atomic_read(&conn->sndbuf_space); |
179 | /* not more than what user space asked for */ | |
180 | copylen = min_t(size_t, send_remaining, writespace); | |
181 | /* determine start of sndbuf */ | |
182 | sndbuf_base = conn->sndbuf_desc->cpu_addr; | |
bac6de7b | 183 | smc_curs_copy(&prep, &conn->tx_curs_prep, conn); |
e6727f39 UB |
184 | tx_cnt_prep = prep.count; |
185 | /* determine chunks where to write into sndbuf */ | |
186 | /* either unwrapped case, or 1st chunk of wrapped case */ | |
69cb7dc0 HW |
187 | chunk_len = min_t(size_t, copylen, conn->sndbuf_desc->len - |
188 | tx_cnt_prep); | |
e6727f39 UB |
189 | chunk_len_sum = chunk_len; |
190 | chunk_off = tx_cnt_prep; | |
10428dd8 | 191 | smc_sndbuf_sync_sg_for_cpu(conn); |
e6727f39 UB |
192 | for (chunk = 0; chunk < 2; chunk++) { |
193 | rc = memcpy_from_msg(sndbuf_base + chunk_off, | |
194 | msg, chunk_len); | |
195 | if (rc) { | |
10428dd8 | 196 | smc_sndbuf_sync_sg_for_device(conn); |
e6727f39 UB |
197 | if (send_done) |
198 | return send_done; | |
199 | goto out_err; | |
200 | } | |
201 | send_done += chunk_len; | |
202 | send_remaining -= chunk_len; | |
203 | ||
204 | if (chunk_len_sum == copylen) | |
205 | break; /* either on 1st or 2nd iteration */ | |
206 | /* prepare next (== 2nd) iteration */ | |
207 | chunk_len = copylen - chunk_len; /* remainder */ | |
208 | chunk_len_sum += chunk_len; | |
209 | chunk_off = 0; /* modulo offset in send ring buffer */ | |
210 | } | |
10428dd8 | 211 | smc_sndbuf_sync_sg_for_device(conn); |
e6727f39 | 212 | /* update cursors */ |
69cb7dc0 | 213 | smc_curs_add(conn->sndbuf_desc->len, &prep, copylen); |
bac6de7b | 214 | smc_curs_copy(&conn->tx_curs_prep, &prep, conn); |
e6727f39 UB |
215 | /* increased in send tasklet smc_cdc_tx_handler() */ |
216 | smp_mb__before_atomic(); | |
217 | atomic_sub(copylen, &conn->sndbuf_space); | |
69cb7dc0 | 218 | /* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */ |
e6727f39 UB |
219 | smp_mb__after_atomic(); |
220 | /* since we just produced more new data into sndbuf, | |
221 | * trigger sndbuf consumer: RDMA write into peer RMBE and CDC | |
222 | */ | |
de8474eb SR |
223 | if ((msg->msg_flags & MSG_OOB) && !send_remaining) |
224 | conn->urg_tx_pend = true; | |
01d2f7e2 UB |
225 | if ((msg->msg_flags & MSG_MORE || smc_tx_is_corked(smc)) && |
226 | (atomic_read(&conn->sndbuf_space) > | |
69cb7dc0 | 227 | (conn->sndbuf_desc->len >> 1))) |
01d2f7e2 UB |
228 | /* for a corked socket defer the RDMA writes if there |
229 | * is still sufficient sndbuf_space available | |
230 | */ | |
231 | schedule_delayed_work(&conn->tx_work, | |
232 | SMC_TX_CORK_DELAY); | |
233 | else | |
234 | smc_tx_sndbuf_nonempty(conn); | |
e6727f39 UB |
235 | } /* while (msg_data_left(msg)) */ |
236 | ||
237 | return send_done; | |
238 | ||
239 | out_err: | |
240 | rc = sk_stream_error(sk, msg->msg_flags, rc); | |
241 | /* make sure we wake any epoll edge trigger waiter */ | |
242 | if (unlikely(rc == -EAGAIN)) | |
243 | sk->sk_write_space(sk); | |
244 | return rc; | |
245 | } | |
246 | ||
247 | /***************************** sndbuf consumer *******************************/ | |
248 | ||
be244f28 HW |
249 | /* sndbuf consumer: actual data transfer of one target chunk with ISM write */ |
250 | int smcd_tx_ism_write(struct smc_connection *conn, void *data, size_t len, | |
251 | u32 offset, int signal) | |
252 | { | |
253 | struct smc_ism_position pos; | |
254 | int rc; | |
255 | ||
256 | memset(&pos, 0, sizeof(pos)); | |
257 | pos.token = conn->peer_token; | |
258 | pos.index = conn->peer_rmbe_idx; | |
259 | pos.offset = conn->tx_off + offset; | |
260 | pos.signal = signal; | |
261 | rc = smc_ism_write(conn->lgr->smcd, &pos, data, len); | |
262 | if (rc) | |
263 | conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; | |
264 | return rc; | |
265 | } | |
266 | ||
e6727f39 UB |
267 | /* sndbuf consumer: actual data transfer of one target chunk with RDMA write */ |
268 | static int smc_tx_rdma_write(struct smc_connection *conn, int peer_rmbe_offset, | |
ad6f317f | 269 | int num_sges, struct ib_rdma_wr *rdma_wr) |
e6727f39 UB |
270 | { |
271 | struct smc_link_group *lgr = conn->lgr; | |
e6727f39 UB |
272 | struct smc_link *link; |
273 | int rc; | |
274 | ||
e6727f39 | 275 | link = &lgr->lnk[SMC_SINGLE_LINK]; |
ad6f317f UB |
276 | rdma_wr->wr.wr_id = smc_wr_tx_get_next_wr_id(link); |
277 | rdma_wr->wr.num_sge = num_sges; | |
278 | rdma_wr->remote_addr = | |
e6727f39 UB |
279 | lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].dma_addr + |
280 | /* RMBE within RMB */ | |
95d8d263 | 281 | conn->tx_off + |
e6727f39 UB |
282 | /* offset within RMBE */ |
283 | peer_rmbe_offset; | |
ad6f317f UB |
284 | rdma_wr->rkey = lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].rkey; |
285 | rc = ib_post_send(link->roce_qp, &rdma_wr->wr, NULL); | |
b2900980 | 286 | if (rc) |
5421ec28 | 287 | smc_lgr_terminate(lgr, true); |
e6727f39 UB |
288 | return rc; |
289 | } | |
290 | ||
291 | /* sndbuf consumer */ | |
292 | static inline void smc_tx_advance_cursors(struct smc_connection *conn, | |
293 | union smc_host_cursor *prod, | |
294 | union smc_host_cursor *sent, | |
295 | size_t len) | |
296 | { | |
297 | smc_curs_add(conn->peer_rmbe_size, prod, len); | |
298 | /* increased in recv tasklet smc_cdc_msg_rcv() */ | |
299 | smp_mb__before_atomic(); | |
300 | /* data in flight reduces usable snd_wnd */ | |
301 | atomic_sub(len, &conn->peer_rmbe_space); | |
302 | /* guarantee 0 <= peer_rmbe_space <= peer_rmbe_size */ | |
303 | smp_mb__after_atomic(); | |
69cb7dc0 | 304 | smc_curs_add(conn->sndbuf_desc->len, sent, len); |
e6727f39 UB |
305 | } |
306 | ||
be244f28 HW |
307 | /* SMC-R helper for smc_tx_rdma_writes() */ |
308 | static int smcr_tx_rdma_writes(struct smc_connection *conn, size_t len, | |
309 | size_t src_off, size_t src_len, | |
ad6f317f UB |
310 | size_t dst_off, size_t dst_len, |
311 | struct smc_rdma_wr *wr_rdma_buf) | |
be244f28 HW |
312 | { |
313 | dma_addr_t dma_addr = | |
314 | sg_dma_address(conn->sndbuf_desc->sgt[SMC_SINGLE_LINK].sgl); | |
be244f28 | 315 | int src_len_sum = src_len, dst_len_sum = dst_len; |
be244f28 HW |
316 | int sent_count = src_off; |
317 | int srcchunk, dstchunk; | |
318 | int num_sges; | |
319 | int rc; | |
320 | ||
321 | for (dstchunk = 0; dstchunk < 2; dstchunk++) { | |
ad6f317f UB |
322 | struct ib_sge *sge = |
323 | wr_rdma_buf->wr_tx_rdma[dstchunk].wr.sg_list; | |
324 | ||
be244f28 HW |
325 | num_sges = 0; |
326 | for (srcchunk = 0; srcchunk < 2; srcchunk++) { | |
ad6f317f UB |
327 | sge[srcchunk].addr = dma_addr + src_off; |
328 | sge[srcchunk].length = src_len; | |
be244f28 HW |
329 | num_sges++; |
330 | ||
331 | src_off += src_len; | |
332 | if (src_off >= conn->sndbuf_desc->len) | |
333 | src_off -= conn->sndbuf_desc->len; | |
334 | /* modulo in send ring */ | |
335 | if (src_len_sum == dst_len) | |
336 | break; /* either on 1st or 2nd iteration */ | |
337 | /* prepare next (== 2nd) iteration */ | |
338 | src_len = dst_len - src_len; /* remainder */ | |
339 | src_len_sum += src_len; | |
340 | } | |
ad6f317f UB |
341 | rc = smc_tx_rdma_write(conn, dst_off, num_sges, |
342 | &wr_rdma_buf->wr_tx_rdma[dstchunk]); | |
be244f28 HW |
343 | if (rc) |
344 | return rc; | |
345 | if (dst_len_sum == len) | |
346 | break; /* either on 1st or 2nd iteration */ | |
347 | /* prepare next (== 2nd) iteration */ | |
348 | dst_off = 0; /* modulo offset in RMBE ring buffer */ | |
349 | dst_len = len - dst_len; /* remainder */ | |
350 | dst_len_sum += dst_len; | |
351 | src_len = min_t(int, dst_len, conn->sndbuf_desc->len - | |
352 | sent_count); | |
353 | src_len_sum = src_len; | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* SMC-D helper for smc_tx_rdma_writes() */ | |
359 | static int smcd_tx_rdma_writes(struct smc_connection *conn, size_t len, | |
360 | size_t src_off, size_t src_len, | |
361 | size_t dst_off, size_t dst_len) | |
362 | { | |
363 | int src_len_sum = src_len, dst_len_sum = dst_len; | |
364 | int srcchunk, dstchunk; | |
365 | int rc; | |
366 | ||
367 | for (dstchunk = 0; dstchunk < 2; dstchunk++) { | |
368 | for (srcchunk = 0; srcchunk < 2; srcchunk++) { | |
369 | void *data = conn->sndbuf_desc->cpu_addr + src_off; | |
370 | ||
371 | rc = smcd_tx_ism_write(conn, data, src_len, dst_off + | |
372 | sizeof(struct smcd_cdc_msg), 0); | |
373 | if (rc) | |
374 | return rc; | |
375 | dst_off += src_len; | |
376 | src_off += src_len; | |
377 | if (src_off >= conn->sndbuf_desc->len) | |
378 | src_off -= conn->sndbuf_desc->len; | |
379 | /* modulo in send ring */ | |
380 | if (src_len_sum == dst_len) | |
381 | break; /* either on 1st or 2nd iteration */ | |
382 | /* prepare next (== 2nd) iteration */ | |
383 | src_len = dst_len - src_len; /* remainder */ | |
384 | src_len_sum += src_len; | |
385 | } | |
386 | if (dst_len_sum == len) | |
387 | break; /* either on 1st or 2nd iteration */ | |
388 | /* prepare next (== 2nd) iteration */ | |
389 | dst_off = 0; /* modulo offset in RMBE ring buffer */ | |
390 | dst_len = len - dst_len; /* remainder */ | |
391 | dst_len_sum += dst_len; | |
392 | src_len = min_t(int, dst_len, conn->sndbuf_desc->len - src_off); | |
393 | src_len_sum = src_len; | |
394 | } | |
395 | return 0; | |
396 | } | |
397 | ||
e6727f39 UB |
398 | /* sndbuf consumer: prepare all necessary (src&dst) chunks of data transmit; |
399 | * usable snd_wnd as max transmit | |
400 | */ | |
ad6f317f UB |
401 | static int smc_tx_rdma_writes(struct smc_connection *conn, |
402 | struct smc_rdma_wr *wr_rdma_buf) | |
e6727f39 | 403 | { |
be244f28 | 404 | size_t len, src_len, dst_off, dst_len; /* current chunk values */ |
e6727f39 | 405 | union smc_host_cursor sent, prep, prod, cons; |
de8474eb | 406 | struct smc_cdc_producer_flags *pflags; |
e6727f39 | 407 | int to_send, rmbespace; |
e6727f39 UB |
408 | int rc; |
409 | ||
410 | /* source: sndbuf */ | |
bac6de7b SR |
411 | smc_curs_copy(&sent, &conn->tx_curs_sent, conn); |
412 | smc_curs_copy(&prep, &conn->tx_curs_prep, conn); | |
e6727f39 | 413 | /* cf. wmem_alloc - (snd_max - snd_una) */ |
69cb7dc0 | 414 | to_send = smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep); |
e6727f39 UB |
415 | if (to_send <= 0) |
416 | return 0; | |
417 | ||
418 | /* destination: RMBE */ | |
419 | /* cf. snd_wnd */ | |
420 | rmbespace = atomic_read(&conn->peer_rmbe_space); | |
421 | if (rmbespace <= 0) | |
422 | return 0; | |
bac6de7b SR |
423 | smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); |
424 | smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); | |
e6727f39 UB |
425 | |
426 | /* if usable snd_wnd closes ask peer to advertise once it opens again */ | |
de8474eb SR |
427 | pflags = &conn->local_tx_ctrl.prod_flags; |
428 | pflags->write_blocked = (to_send >= rmbespace); | |
e6727f39 UB |
429 | /* cf. usable snd_wnd */ |
430 | len = min(to_send, rmbespace); | |
431 | ||
432 | /* initialize variables for first iteration of subsequent nested loop */ | |
e6727f39 UB |
433 | dst_off = prod.count; |
434 | if (prod.wrap == cons.wrap) { | |
435 | /* the filled destination area is unwrapped, | |
436 | * hence the available free destination space is wrapped | |
437 | * and we need 2 destination chunks of sum len; start with 1st | |
438 | * which is limited by what's available in sndbuf | |
439 | */ | |
440 | dst_len = min_t(size_t, | |
441 | conn->peer_rmbe_size - prod.count, len); | |
442 | } else { | |
443 | /* the filled destination area is wrapped, | |
444 | * hence the available free destination space is unwrapped | |
445 | * and we need a single destination chunk of entire len | |
446 | */ | |
447 | dst_len = len; | |
448 | } | |
e6727f39 | 449 | /* dst_len determines the maximum src_len */ |
69cb7dc0 | 450 | if (sent.count + dst_len <= conn->sndbuf_desc->len) { |
e6727f39 UB |
451 | /* unwrapped src case: single chunk of entire dst_len */ |
452 | src_len = dst_len; | |
453 | } else { | |
454 | /* wrapped src case: 2 chunks of sum dst_len; start with 1st: */ | |
69cb7dc0 | 455 | src_len = conn->sndbuf_desc->len - sent.count; |
e6727f39 | 456 | } |
be244f28 HW |
457 | |
458 | if (conn->lgr->is_smcd) | |
459 | rc = smcd_tx_rdma_writes(conn, len, sent.count, src_len, | |
460 | dst_off, dst_len); | |
461 | else | |
462 | rc = smcr_tx_rdma_writes(conn, len, sent.count, src_len, | |
ad6f317f | 463 | dst_off, dst_len, wr_rdma_buf); |
be244f28 HW |
464 | if (rc) |
465 | return rc; | |
e6727f39 | 466 | |
de8474eb SR |
467 | if (conn->urg_tx_pend && len == to_send) |
468 | pflags->urg_data_present = 1; | |
e6727f39 UB |
469 | smc_tx_advance_cursors(conn, &prod, &sent, len); |
470 | /* update connection's cursors with advanced local cursors */ | |
bac6de7b | 471 | smc_curs_copy(&conn->local_tx_ctrl.prod, &prod, conn); |
e6727f39 | 472 | /* dst: peer RMBE */ |
bac6de7b | 473 | smc_curs_copy(&conn->tx_curs_sent, &sent, conn);/* src: local sndbuf */ |
e6727f39 UB |
474 | |
475 | return 0; | |
476 | } | |
477 | ||
478 | /* Wakeup sndbuf consumers from any context (IRQ or process) | |
479 | * since there is more data to transmit; usable snd_wnd as max transmit | |
480 | */ | |
be244f28 | 481 | static int smcr_tx_sndbuf_nonempty(struct smc_connection *conn) |
e6727f39 | 482 | { |
cecc7a31 | 483 | struct smc_cdc_producer_flags *pflags = &conn->local_tx_ctrl.prod_flags; |
ad6f317f | 484 | struct smc_rdma_wr *wr_rdma_buf; |
e6727f39 UB |
485 | struct smc_cdc_tx_pend *pend; |
486 | struct smc_wr_buf *wr_buf; | |
487 | int rc; | |
488 | ||
ad6f317f | 489 | rc = smc_cdc_get_free_slot(conn, &wr_buf, &wr_rdma_buf, &pend); |
e6727f39 UB |
490 | if (rc < 0) { |
491 | if (rc == -EBUSY) { | |
b38d7324 UB |
492 | struct smc_sock *smc = |
493 | container_of(conn, struct smc_sock, conn); | |
494 | ||
33f3fcc2 KG |
495 | if (smc->sk.sk_err == ECONNABORTED) |
496 | return sock_error(&smc->sk); | |
b2900980 UB |
497 | if (conn->killed) |
498 | return -EPIPE; | |
e6727f39 | 499 | rc = 0; |
b2900980 UB |
500 | mod_delayed_work(system_wq, &conn->tx_work, |
501 | SMC_TX_WORK_DELAY); | |
e6727f39 | 502 | } |
33f3fcc2 | 503 | return rc; |
e6727f39 UB |
504 | } |
505 | ||
33f3fcc2 | 506 | spin_lock_bh(&conn->send_lock); |
cecc7a31 | 507 | if (!pflags->urg_data_present) { |
ad6f317f | 508 | rc = smc_tx_rdma_writes(conn, wr_rdma_buf); |
de8474eb SR |
509 | if (rc) { |
510 | smc_wr_tx_put_slot(&conn->lgr->lnk[SMC_SINGLE_LINK], | |
511 | (struct smc_wr_tx_pend_priv *)pend); | |
512 | goto out_unlock; | |
513 | } | |
e6727f39 UB |
514 | } |
515 | ||
516 | rc = smc_cdc_msg_send(conn, wr_buf, pend); | |
de8474eb SR |
517 | if (!rc && pflags->urg_data_present) { |
518 | pflags->urg_data_pending = 0; | |
519 | pflags->urg_data_present = 0; | |
520 | } | |
e6727f39 UB |
521 | |
522 | out_unlock: | |
523 | spin_unlock_bh(&conn->send_lock); | |
524 | return rc; | |
525 | } | |
526 | ||
be244f28 HW |
527 | static int smcd_tx_sndbuf_nonempty(struct smc_connection *conn) |
528 | { | |
529 | struct smc_cdc_producer_flags *pflags = &conn->local_tx_ctrl.prod_flags; | |
530 | int rc = 0; | |
531 | ||
532 | spin_lock_bh(&conn->send_lock); | |
533 | if (!pflags->urg_data_present) | |
ad6f317f | 534 | rc = smc_tx_rdma_writes(conn, NULL); |
be244f28 HW |
535 | if (!rc) |
536 | rc = smcd_cdc_msg_send(conn); | |
537 | ||
538 | if (!rc && pflags->urg_data_present) { | |
539 | pflags->urg_data_pending = 0; | |
540 | pflags->urg_data_present = 0; | |
541 | } | |
542 | spin_unlock_bh(&conn->send_lock); | |
543 | return rc; | |
544 | } | |
545 | ||
546 | int smc_tx_sndbuf_nonempty(struct smc_connection *conn) | |
547 | { | |
548 | int rc; | |
549 | ||
b2900980 UB |
550 | if (conn->killed || |
551 | conn->local_rx_ctrl.conn_state_flags.peer_conn_abort) | |
552 | return -EPIPE; /* connection being aborted */ | |
be244f28 HW |
553 | if (conn->lgr->is_smcd) |
554 | rc = smcd_tx_sndbuf_nonempty(conn); | |
555 | else | |
556 | rc = smcr_tx_sndbuf_nonempty(conn); | |
557 | ||
5bc056d8 KG |
558 | if (!rc) { |
559 | /* trigger socket release if connection is closing */ | |
560 | struct smc_sock *smc = container_of(conn, struct smc_sock, | |
561 | conn); | |
562 | smc_close_wake_tx_prepared(smc); | |
563 | } | |
be244f28 HW |
564 | return rc; |
565 | } | |
566 | ||
e6727f39 UB |
567 | /* Wakeup sndbuf consumers from process context |
568 | * since there is more data to transmit | |
569 | */ | |
be7f3e59 | 570 | void smc_tx_work(struct work_struct *work) |
e6727f39 | 571 | { |
18e537cd | 572 | struct smc_connection *conn = container_of(to_delayed_work(work), |
e6727f39 UB |
573 | struct smc_connection, |
574 | tx_work); | |
575 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
90cacb2e | 576 | int rc; |
e6727f39 UB |
577 | |
578 | lock_sock(&smc->sk); | |
b2900980 | 579 | if (smc->sk.sk_err) |
1a0a04c7 UB |
580 | goto out; |
581 | ||
90cacb2e UB |
582 | rc = smc_tx_sndbuf_nonempty(conn); |
583 | if (!rc && conn->local_rx_ctrl.prod_flags.write_blocked && | |
584 | !atomic_read(&conn->bytes_to_rcv)) | |
585 | conn->local_rx_ctrl.prod_flags.write_blocked = 0; | |
1a0a04c7 UB |
586 | |
587 | out: | |
e6727f39 UB |
588 | release_sock(&smc->sk); |
589 | } | |
590 | ||
de8474eb | 591 | void smc_tx_consumer_update(struct smc_connection *conn, bool force) |
952310cc | 592 | { |
99be51f1 UB |
593 | union smc_host_cursor cfed, cons, prod; |
594 | int sender_free = conn->rmb_desc->len; | |
6b5771aa | 595 | int to_confirm; |
952310cc | 596 | |
bac6de7b SR |
597 | smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); |
598 | smc_curs_copy(&cfed, &conn->rx_curs_confirmed, conn); | |
69cb7dc0 | 599 | to_confirm = smc_curs_diff(conn->rmb_desc->len, &cfed, &cons); |
99be51f1 | 600 | if (to_confirm > conn->rmbe_update_limit) { |
bac6de7b | 601 | smc_curs_copy(&prod, &conn->local_rx_ctrl.prod, conn); |
99be51f1 | 602 | sender_free = conn->rmb_desc->len - |
b8649efa UB |
603 | smc_curs_diff_large(conn->rmb_desc->len, |
604 | &cfed, &prod); | |
99be51f1 | 605 | } |
952310cc UB |
606 | |
607 | if (conn->local_rx_ctrl.prod_flags.cons_curs_upd_req || | |
de8474eb | 608 | force || |
952310cc | 609 | ((to_confirm > conn->rmbe_update_limit) && |
99be51f1 | 610 | ((sender_free <= (conn->rmb_desc->len / 2)) || |
952310cc | 611 | conn->local_rx_ctrl.prod_flags.write_blocked))) { |
b2900980 UB |
612 | if (conn->killed || |
613 | conn->local_rx_ctrl.conn_state_flags.peer_conn_abort) | |
614 | return; | |
1a0a04c7 | 615 | if ((smc_cdc_get_slot_and_msg_send(conn) < 0) && |
b2900980 | 616 | !conn->killed) { |
18e537cd UB |
617 | schedule_delayed_work(&conn->tx_work, |
618 | SMC_TX_WORK_DELAY); | |
952310cc UB |
619 | return; |
620 | } | |
952310cc UB |
621 | } |
622 | if (conn->local_rx_ctrl.prod_flags.write_blocked && | |
623 | !atomic_read(&conn->bytes_to_rcv)) | |
624 | conn->local_rx_ctrl.prod_flags.write_blocked = 0; | |
625 | } | |
626 | ||
e6727f39 UB |
627 | /***************************** send initialize *******************************/ |
628 | ||
629 | /* Initialize send properties on connection establishment. NB: not __init! */ | |
630 | void smc_tx_init(struct smc_sock *smc) | |
631 | { | |
632 | smc->sk.sk_write_space = smc_tx_write_space; | |
e6727f39 | 633 | } |