blob: 23718160d71ec9fdb919f95f6c7d73fd61a2ffad [file] [log] [blame]
Andy Grover5c115592009-02-24 15:30:27 +00001/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
Paul Gortmakerd9b93842011-09-18 13:21:27 -040034#include <linux/moduleparam.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/gfp.h>
Andy Grover5c115592009-02-24 15:30:27 +000036#include <net/sock.h>
37#include <linux/in.h>
38#include <linux/list.h>
Manuel Zerpiescb0a6052011-06-16 02:09:57 +000039#include <linux/ratelimit.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040040#include <linux/export.h>
Andy Grover5c115592009-02-24 15:30:27 +000041
42#include "rds.h"
Andy Grover5c115592009-02-24 15:30:27 +000043
44/* When transmitting messages in rds_send_xmit, we need to emerge from
45 * time to time and briefly release the CPU. Otherwise the softlock watchdog
46 * will kick our shin.
47 * Also, it seems fairer to not let one busy connection stall all the
48 * others.
49 *
50 * send_batch_count is the number of times we'll loop in send_xmit. Setting
51 * it to 0 will restore the old behavior (where we looped until we had
52 * drained the queue).
53 */
54static int send_batch_count = 64;
55module_param(send_batch_count, int, 0444);
56MODULE_PARM_DESC(send_batch_count, " batch factor when working the send queue");
57
stephen hemmingerff51bf82010-10-19 08:08:33 +000058static void rds_send_remove_from_sock(struct list_head *messages, int status);
59
Andy Grover5c115592009-02-24 15:30:27 +000060/*
Zach Brown0f4b1c72010-06-04 14:41:41 -070061 * Reset the send state. Callers must ensure that this doesn't race with
62 * rds_send_xmit().
Andy Grover5c115592009-02-24 15:30:27 +000063 */
64void rds_send_reset(struct rds_connection *conn)
65{
66 struct rds_message *rm, *tmp;
67 unsigned long flags;
68
69 if (conn->c_xmit_rm) {
Chris Mason7e3f2952010-05-11 15:11:11 -070070 rm = conn->c_xmit_rm;
71 conn->c_xmit_rm = NULL;
Andy Grover5c115592009-02-24 15:30:27 +000072 /* Tell the user the RDMA op is no longer mapped by the
73 * transport. This isn't entirely true (it's flushed out
74 * independently) but as the connection is down, there's
75 * no ongoing RDMA to/from that memory */
Chris Mason7e3f2952010-05-11 15:11:11 -070076 rds_message_unmapped(rm);
Chris Mason7e3f2952010-05-11 15:11:11 -070077 rds_message_put(rm);
Andy Grover5c115592009-02-24 15:30:27 +000078 }
Chris Mason7e3f2952010-05-11 15:11:11 -070079
Andy Grover5c115592009-02-24 15:30:27 +000080 conn->c_xmit_sg = 0;
81 conn->c_xmit_hdr_off = 0;
82 conn->c_xmit_data_off = 0;
Andy Grover15133f62010-01-12 14:33:38 -080083 conn->c_xmit_atomic_sent = 0;
Andy Grover5b2366b2010-02-03 19:36:44 -080084 conn->c_xmit_rdma_sent = 0;
85 conn->c_xmit_data_sent = 0;
Andy Grover5c115592009-02-24 15:30:27 +000086
87 conn->c_map_queued = 0;
88
89 conn->c_unacked_packets = rds_sysctl_max_unacked_packets;
90 conn->c_unacked_bytes = rds_sysctl_max_unacked_bytes;
91
92 /* Mark messages as retransmissions, and move them to the send q */
93 spin_lock_irqsave(&conn->c_lock, flags);
94 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
95 set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
96 set_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags);
97 }
98 list_splice_init(&conn->c_retrans, &conn->c_send_queue);
99 spin_unlock_irqrestore(&conn->c_lock, flags);
100}
101
Zach Brown0f4b1c72010-06-04 14:41:41 -0700102static int acquire_in_xmit(struct rds_connection *conn)
103{
104 return test_and_set_bit(RDS_IN_XMIT, &conn->c_flags) == 0;
105}
106
107static void release_in_xmit(struct rds_connection *conn)
108{
109 clear_bit(RDS_IN_XMIT, &conn->c_flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100110 smp_mb__after_atomic();
Zach Brown0f4b1c72010-06-04 14:41:41 -0700111 /*
112 * We don't use wait_on_bit()/wake_up_bit() because our waking is in a
113 * hot path and finding waiters is very rare. We don't want to walk
114 * the system-wide hashed waitqueue buckets in the fast path only to
115 * almost never find waiters.
116 */
117 if (waitqueue_active(&conn->c_waitq))
118 wake_up_all(&conn->c_waitq);
119}
120
Andy Grover5c115592009-02-24 15:30:27 +0000121/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300122 * We're making the conscious trade-off here to only send one message
Andy Grover5c115592009-02-24 15:30:27 +0000123 * down the connection at a time.
124 * Pro:
125 * - tx queueing is a simple fifo list
126 * - reassembly is optional and easily done by transports per conn
127 * - no per flow rx lookup at all, straight to the socket
128 * - less per-frag memory and wire overhead
129 * Con:
130 * - queued acks can be delayed behind large messages
131 * Depends:
132 * - small message latency is higher behind queued large messages
133 * - large message latency isn't starved by intervening small sends
134 */
135int rds_send_xmit(struct rds_connection *conn)
136{
137 struct rds_message *rm;
138 unsigned long flags;
139 unsigned int tmp;
Andy Grover5c115592009-02-24 15:30:27 +0000140 struct scatterlist *sg;
141 int ret = 0;
Andy Grover5c115592009-02-24 15:30:27 +0000142 LIST_HEAD(to_be_dropped);
143
Andy Groverfcc54502010-03-29 17:08:49 -0700144restart:
Andy Grover049ee3f2010-03-23 17:39:07 -0700145
Andy Grover5c115592009-02-24 15:30:27 +0000146 /*
147 * sendmsg calls here after having queued its message on the send
148 * queue. We only have one task feeding the connection at a time. If
149 * another thread is already feeding the queue then we back off. This
150 * avoids blocking the caller and trading per-connection data between
151 * caches per message.
Andy Grover5c115592009-02-24 15:30:27 +0000152 */
Zach Brown0f4b1c72010-06-04 14:41:41 -0700153 if (!acquire_in_xmit(conn)) {
Andy Grover049ee3f2010-03-23 17:39:07 -0700154 rds_stats_inc(s_send_lock_contention);
Andy Grover5c115592009-02-24 15:30:27 +0000155 ret = -ENOMEM;
156 goto out;
157 }
Zach Brown0f4b1c72010-06-04 14:41:41 -0700158
159 /*
160 * rds_conn_shutdown() sets the conn state and then tests RDS_IN_XMIT,
161 * we do the opposite to avoid races.
162 */
163 if (!rds_conn_up(conn)) {
164 release_in_xmit(conn);
165 ret = 0;
166 goto out;
167 }
Andy Grover5c115592009-02-24 15:30:27 +0000168
169 if (conn->c_trans->xmit_prepare)
170 conn->c_trans->xmit_prepare(conn);
171
172 /*
173 * spin trying to push headers and data down the connection until
Andy Grover5b2366b2010-02-03 19:36:44 -0800174 * the connection doesn't make forward progress.
Andy Grover5c115592009-02-24 15:30:27 +0000175 */
Andy Groverfcc54502010-03-29 17:08:49 -0700176 while (1) {
Andy Grover5c115592009-02-24 15:30:27 +0000177
Andy Grover5c115592009-02-24 15:30:27 +0000178 rm = conn->c_xmit_rm;
Andy Grover5c115592009-02-24 15:30:27 +0000179
Andy Grover5b2366b2010-02-03 19:36:44 -0800180 /*
181 * If between sending messages, we can send a pending congestion
182 * map update.
Andy Grover5c115592009-02-24 15:30:27 +0000183 */
Andy Grover8690bfa2010-01-12 11:56:44 -0800184 if (!rm && test_and_clear_bit(0, &conn->c_map_queued)) {
Andy Grover77dd5502010-03-22 15:22:04 -0700185 rm = rds_cong_update_alloc(conn);
186 if (IS_ERR(rm)) {
187 ret = PTR_ERR(rm);
188 break;
Andy Grover5b2366b2010-02-03 19:36:44 -0800189 }
Andy Grover77dd5502010-03-22 15:22:04 -0700190 rm->data.op_active = 1;
191
192 conn->c_xmit_rm = rm;
Andy Grover5c115592009-02-24 15:30:27 +0000193 }
194
195 /*
Andy Grover5b2366b2010-02-03 19:36:44 -0800196 * If not already working on one, grab the next message.
Andy Grover5c115592009-02-24 15:30:27 +0000197 *
198 * c_xmit_rm holds a ref while we're sending this message down
199 * the connction. We can use this ref while holding the
200 * send_sem.. rds_send_reset() is serialized with it.
201 */
Andy Grover8690bfa2010-01-12 11:56:44 -0800202 if (!rm) {
Andy Grover5c115592009-02-24 15:30:27 +0000203 unsigned int len;
204
Zach Brown0f4b1c72010-06-04 14:41:41 -0700205 spin_lock_irqsave(&conn->c_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000206
207 if (!list_empty(&conn->c_send_queue)) {
208 rm = list_entry(conn->c_send_queue.next,
209 struct rds_message,
210 m_conn_item);
211 rds_message_addref(rm);
212
213 /*
214 * Move the message from the send queue to the retransmit
215 * list right away.
216 */
217 list_move_tail(&rm->m_conn_item, &conn->c_retrans);
218 }
219
Zach Brown0f4b1c72010-06-04 14:41:41 -0700220 spin_unlock_irqrestore(&conn->c_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000221
Andy Groverfcc54502010-03-29 17:08:49 -0700222 if (!rm)
Andy Grover5c115592009-02-24 15:30:27 +0000223 break;
Andy Grover5c115592009-02-24 15:30:27 +0000224
225 /* Unfortunately, the way Infiniband deals with
226 * RDMA to a bad MR key is by moving the entire
227 * queue pair to error state. We cold possibly
228 * recover from that, but right now we drop the
229 * connection.
230 * Therefore, we never retransmit messages with RDMA ops.
231 */
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800232 if (rm->rdma.op_active &&
Joe Perchesf64f9e72009-11-29 16:55:45 -0800233 test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags)) {
Zach Brown0f4b1c72010-06-04 14:41:41 -0700234 spin_lock_irqsave(&conn->c_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000235 if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags))
236 list_move(&rm->m_conn_item, &to_be_dropped);
Zach Brown0f4b1c72010-06-04 14:41:41 -0700237 spin_unlock_irqrestore(&conn->c_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000238 continue;
239 }
240
241 /* Require an ACK every once in a while */
242 len = ntohl(rm->m_inc.i_hdr.h_len);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800243 if (conn->c_unacked_packets == 0 ||
244 conn->c_unacked_bytes < len) {
Andy Grover5c115592009-02-24 15:30:27 +0000245 __set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
246
247 conn->c_unacked_packets = rds_sysctl_max_unacked_packets;
248 conn->c_unacked_bytes = rds_sysctl_max_unacked_bytes;
249 rds_stats_inc(s_send_ack_required);
250 } else {
251 conn->c_unacked_bytes -= len;
252 conn->c_unacked_packets--;
253 }
254
255 conn->c_xmit_rm = rm;
256 }
257
Andy Grover2c3a5f92010-03-01 16:10:40 -0800258 /* The transport either sends the whole rdma or none of it */
259 if (rm->rdma.op_active && !conn->c_xmit_rdma_sent) {
Andy Groverff3d7d32010-03-01 14:03:09 -0800260 rm->m_final_op = &rm->rdma;
Andy Grover2c3a5f92010-03-01 16:10:40 -0800261 ret = conn->c_trans->xmit_rdma(conn, &rm->rdma);
Chris Mason1cc22282010-05-11 16:15:35 -0700262 if (ret)
Andy Grover2c3a5f92010-03-01 16:10:40 -0800263 break;
264 conn->c_xmit_rdma_sent = 1;
265
266 /* The transport owns the mapped memory for now.
267 * You can't unmap it while it's on the send queue */
268 set_bit(RDS_MSG_MAPPED, &rm->m_flags);
269 }
270
Andy Grover15133f62010-01-12 14:33:38 -0800271 if (rm->atomic.op_active && !conn->c_xmit_atomic_sent) {
Andy Groverff3d7d32010-03-01 14:03:09 -0800272 rm->m_final_op = &rm->atomic;
273 ret = conn->c_trans->xmit_atomic(conn, &rm->atomic);
Chris Mason1cc22282010-05-11 16:15:35 -0700274 if (ret)
Andy Grover15133f62010-01-12 14:33:38 -0800275 break;
276 conn->c_xmit_atomic_sent = 1;
Andy Groverff3d7d32010-03-01 14:03:09 -0800277
Andy Grover15133f62010-01-12 14:33:38 -0800278 /* The transport owns the mapped memory for now.
279 * You can't unmap it while it's on the send queue */
280 set_bit(RDS_MSG_MAPPED, &rm->m_flags);
281 }
282
Andy Grover2c3a5f92010-03-01 16:10:40 -0800283 /*
284 * A number of cases require an RDS header to be sent
285 * even if there is no data.
286 * We permit 0-byte sends; rds-ping depends on this.
287 * However, if there are exclusively attached silent ops,
288 * we skip the hdr/data send, to enable silent operation.
289 */
290 if (rm->data.op_nents == 0) {
291 int ops_present;
292 int all_ops_are_silent = 1;
Andy Grover241eef32010-01-19 21:25:26 -0800293
Andy Grover2c3a5f92010-03-01 16:10:40 -0800294 ops_present = (rm->atomic.op_active || rm->rdma.op_active);
295 if (rm->atomic.op_active && !rm->atomic.op_silent)
296 all_ops_are_silent = 0;
297 if (rm->rdma.op_active && !rm->rdma.op_silent)
298 all_ops_are_silent = 0;
Andy Grover241eef32010-01-19 21:25:26 -0800299
Andy Grover2c3a5f92010-03-01 16:10:40 -0800300 if (ops_present && all_ops_are_silent
301 && !rm->m_rdma_cookie)
302 rm->data.op_active = 0;
Andy Grover5c115592009-02-24 15:30:27 +0000303 }
304
Andy Grover5b2366b2010-02-03 19:36:44 -0800305 if (rm->data.op_active && !conn->c_xmit_data_sent) {
Andy Groverff3d7d32010-03-01 14:03:09 -0800306 rm->m_final_op = &rm->data;
Andy Grover5c115592009-02-24 15:30:27 +0000307 ret = conn->c_trans->xmit(conn, rm,
308 conn->c_xmit_hdr_off,
309 conn->c_xmit_sg,
310 conn->c_xmit_data_off);
311 if (ret <= 0)
312 break;
313
314 if (conn->c_xmit_hdr_off < sizeof(struct rds_header)) {
315 tmp = min_t(int, ret,
316 sizeof(struct rds_header) -
317 conn->c_xmit_hdr_off);
318 conn->c_xmit_hdr_off += tmp;
319 ret -= tmp;
320 }
321
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800322 sg = &rm->data.op_sg[conn->c_xmit_sg];
Andy Grover5c115592009-02-24 15:30:27 +0000323 while (ret) {
324 tmp = min_t(int, ret, sg->length -
325 conn->c_xmit_data_off);
326 conn->c_xmit_data_off += tmp;
327 ret -= tmp;
328 if (conn->c_xmit_data_off == sg->length) {
329 conn->c_xmit_data_off = 0;
330 sg++;
331 conn->c_xmit_sg++;
332 BUG_ON(ret != 0 &&
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800333 conn->c_xmit_sg == rm->data.op_nents);
Andy Grover5c115592009-02-24 15:30:27 +0000334 }
335 }
Andy Grover5b2366b2010-02-03 19:36:44 -0800336
337 if (conn->c_xmit_hdr_off == sizeof(struct rds_header) &&
338 (conn->c_xmit_sg == rm->data.op_nents))
339 conn->c_xmit_data_sent = 1;
340 }
341
342 /*
343 * A rm will only take multiple times through this loop
344 * if there is a data op. Thus, if the data is sent (or there was
345 * none), then we're done with the rm.
346 */
347 if (!rm->data.op_active || conn->c_xmit_data_sent) {
348 conn->c_xmit_rm = NULL;
349 conn->c_xmit_sg = 0;
350 conn->c_xmit_hdr_off = 0;
351 conn->c_xmit_data_off = 0;
352 conn->c_xmit_rdma_sent = 0;
353 conn->c_xmit_atomic_sent = 0;
354 conn->c_xmit_data_sent = 0;
355
356 rds_message_put(rm);
Andy Grover5c115592009-02-24 15:30:27 +0000357 }
358 }
359
Andy Grover5c115592009-02-24 15:30:27 +0000360 if (conn->c_trans->xmit_complete)
361 conn->c_trans->xmit_complete(conn);
362
Zach Brown0f4b1c72010-06-04 14:41:41 -0700363 release_in_xmit(conn);
Andy Grover5c115592009-02-24 15:30:27 +0000364
Andy Grover2ad80992010-03-23 17:48:04 -0700365 /* Nuke any messages we decided not to retransmit. */
366 if (!list_empty(&to_be_dropped)) {
367 /* irqs on here, so we can put(), unlike above */
368 list_for_each_entry(rm, &to_be_dropped, m_conn_item)
369 rds_message_put(rm);
370 rds_send_remove_from_sock(&to_be_dropped, RDS_RDMA_DROPPED);
371 }
372
Andy Groverfcc54502010-03-29 17:08:49 -0700373 /*
Zach Brown0f4b1c72010-06-04 14:41:41 -0700374 * Other senders can queue a message after we last test the send queue
375 * but before we clear RDS_IN_XMIT. In that case they'd back off and
376 * not try and send their newly queued message. We need to check the
377 * send queue after having cleared RDS_IN_XMIT so that their message
378 * doesn't get stuck on the send queue.
Andy Groverfcc54502010-03-29 17:08:49 -0700379 *
380 * If the transport cannot continue (i.e ret != 0), then it must
381 * call us when more room is available, such as from the tx
382 * completion handler.
383 */
384 if (ret == 0) {
Chris Mason9e29db02010-04-15 16:38:14 -0400385 smp_mb();
Andy Grover5c115592009-02-24 15:30:27 +0000386 if (!list_empty(&conn->c_send_queue)) {
Andy Grover049ee3f2010-03-23 17:39:07 -0700387 rds_stats_inc(s_send_lock_queue_raced);
Zach Brown0f4b1c72010-06-04 14:41:41 -0700388 goto restart;
Andy Grover5c115592009-02-24 15:30:27 +0000389 }
Andy Grover5c115592009-02-24 15:30:27 +0000390 }
391out:
392 return ret;
393}
394
395static void rds_send_sndbuf_remove(struct rds_sock *rs, struct rds_message *rm)
396{
397 u32 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
398
399 assert_spin_locked(&rs->rs_lock);
400
401 BUG_ON(rs->rs_snd_bytes < len);
402 rs->rs_snd_bytes -= len;
403
404 if (rs->rs_snd_bytes == 0)
405 rds_stats_inc(s_send_queue_empty);
406}
407
408static inline int rds_send_is_acked(struct rds_message *rm, u64 ack,
409 is_acked_func is_acked)
410{
411 if (is_acked)
412 return is_acked(rm, ack);
413 return be64_to_cpu(rm->m_inc.i_hdr.h_sequence) <= ack;
414}
415
416/*
Andy Grover5c115592009-02-24 15:30:27 +0000417 * This is pretty similar to what happens below in the ACK
418 * handling code - except that we call here as soon as we get
419 * the IB send completion on the RDMA op and the accompanying
420 * message.
421 */
422void rds_rdma_send_complete(struct rds_message *rm, int status)
423{
424 struct rds_sock *rs = NULL;
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800425 struct rm_rdma_op *ro;
Andy Grover5c115592009-02-24 15:30:27 +0000426 struct rds_notifier *notifier;
Andy Grover9de08642010-03-29 16:50:54 -0700427 unsigned long flags;
Andy Grover5c115592009-02-24 15:30:27 +0000428
Andy Grover9de08642010-03-29 16:50:54 -0700429 spin_lock_irqsave(&rm->m_rs_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000430
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800431 ro = &rm->rdma;
Joe Perchesf64f9e72009-11-29 16:55:45 -0800432 if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) &&
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800433 ro->op_active && ro->op_notify && ro->op_notifier) {
434 notifier = ro->op_notifier;
Andy Grover5c115592009-02-24 15:30:27 +0000435 rs = rm->m_rs;
436 sock_hold(rds_rs_to_sk(rs));
437
438 notifier->n_status = status;
439 spin_lock(&rs->rs_lock);
440 list_add_tail(&notifier->n_list, &rs->rs_notify_queue);
441 spin_unlock(&rs->rs_lock);
442
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800443 ro->op_notifier = NULL;
Andy Grover5c115592009-02-24 15:30:27 +0000444 }
445
Andy Grover9de08642010-03-29 16:50:54 -0700446 spin_unlock_irqrestore(&rm->m_rs_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000447
448 if (rs) {
449 rds_wake_sk_sleep(rs);
450 sock_put(rds_rs_to_sk(rs));
451 }
452}
Andy Grover616b7572009-08-21 12:28:32 +0000453EXPORT_SYMBOL_GPL(rds_rdma_send_complete);
Andy Grover5c115592009-02-24 15:30:27 +0000454
455/*
Andy Grover15133f62010-01-12 14:33:38 -0800456 * Just like above, except looks at atomic op
457 */
458void rds_atomic_send_complete(struct rds_message *rm, int status)
459{
460 struct rds_sock *rs = NULL;
461 struct rm_atomic_op *ao;
462 struct rds_notifier *notifier;
Andy Grovercf4b7382010-03-29 16:50:54 -0700463 unsigned long flags;
Andy Grover15133f62010-01-12 14:33:38 -0800464
Andy Grovercf4b7382010-03-29 16:50:54 -0700465 spin_lock_irqsave(&rm->m_rs_lock, flags);
Andy Grover15133f62010-01-12 14:33:38 -0800466
467 ao = &rm->atomic;
468 if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags)
469 && ao->op_active && ao->op_notify && ao->op_notifier) {
470 notifier = ao->op_notifier;
471 rs = rm->m_rs;
472 sock_hold(rds_rs_to_sk(rs));
473
474 notifier->n_status = status;
475 spin_lock(&rs->rs_lock);
476 list_add_tail(&notifier->n_list, &rs->rs_notify_queue);
477 spin_unlock(&rs->rs_lock);
478
479 ao->op_notifier = NULL;
480 }
481
Andy Grovercf4b7382010-03-29 16:50:54 -0700482 spin_unlock_irqrestore(&rm->m_rs_lock, flags);
Andy Grover15133f62010-01-12 14:33:38 -0800483
484 if (rs) {
485 rds_wake_sk_sleep(rs);
486 sock_put(rds_rs_to_sk(rs));
487 }
488}
489EXPORT_SYMBOL_GPL(rds_atomic_send_complete);
490
491/*
Andy Grover5c115592009-02-24 15:30:27 +0000492 * This is the same as rds_rdma_send_complete except we
493 * don't do any locking - we have all the ingredients (message,
494 * socket, socket lock) and can just move the notifier.
495 */
496static inline void
Andy Grover940786e2010-02-19 18:04:58 -0800497__rds_send_complete(struct rds_sock *rs, struct rds_message *rm, int status)
Andy Grover5c115592009-02-24 15:30:27 +0000498{
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800499 struct rm_rdma_op *ro;
Andy Grover940786e2010-02-19 18:04:58 -0800500 struct rm_atomic_op *ao;
Andy Grover5c115592009-02-24 15:30:27 +0000501
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800502 ro = &rm->rdma;
503 if (ro->op_active && ro->op_notify && ro->op_notifier) {
504 ro->op_notifier->n_status = status;
505 list_add_tail(&ro->op_notifier->n_list, &rs->rs_notify_queue);
506 ro->op_notifier = NULL;
Andy Grover5c115592009-02-24 15:30:27 +0000507 }
508
Andy Grover940786e2010-02-19 18:04:58 -0800509 ao = &rm->atomic;
510 if (ao->op_active && ao->op_notify && ao->op_notifier) {
511 ao->op_notifier->n_status = status;
512 list_add_tail(&ao->op_notifier->n_list, &rs->rs_notify_queue);
513 ao->op_notifier = NULL;
514 }
515
Andy Grover5c115592009-02-24 15:30:27 +0000516 /* No need to wake the app - caller does this */
517}
518
519/*
520 * This is called from the IB send completion when we detect
521 * a RDMA operation that failed with remote access error.
522 * So speed is not an issue here.
523 */
524struct rds_message *rds_send_get_message(struct rds_connection *conn,
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800525 struct rm_rdma_op *op)
Andy Grover5c115592009-02-24 15:30:27 +0000526{
527 struct rds_message *rm, *tmp, *found = NULL;
528 unsigned long flags;
529
530 spin_lock_irqsave(&conn->c_lock, flags);
531
532 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800533 if (&rm->rdma == op) {
Andy Grover5c115592009-02-24 15:30:27 +0000534 atomic_inc(&rm->m_refcount);
535 found = rm;
536 goto out;
537 }
538 }
539
540 list_for_each_entry_safe(rm, tmp, &conn->c_send_queue, m_conn_item) {
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800541 if (&rm->rdma == op) {
Andy Grover5c115592009-02-24 15:30:27 +0000542 atomic_inc(&rm->m_refcount);
543 found = rm;
544 break;
545 }
546 }
547
548out:
549 spin_unlock_irqrestore(&conn->c_lock, flags);
550
551 return found;
552}
Andy Grover616b7572009-08-21 12:28:32 +0000553EXPORT_SYMBOL_GPL(rds_send_get_message);
Andy Grover5c115592009-02-24 15:30:27 +0000554
555/*
556 * This removes messages from the socket's list if they're on it. The list
557 * argument must be private to the caller, we must be able to modify it
558 * without locks. The messages must have a reference held for their
559 * position on the list. This function will drop that reference after
560 * removing the messages from the 'messages' list regardless of if it found
561 * the messages on the socket list or not.
562 */
stephen hemmingerff51bf82010-10-19 08:08:33 +0000563static void rds_send_remove_from_sock(struct list_head *messages, int status)
Andy Grover5c115592009-02-24 15:30:27 +0000564{
Andy Grover561c7df2010-03-11 13:50:06 +0000565 unsigned long flags;
Andy Grover5c115592009-02-24 15:30:27 +0000566 struct rds_sock *rs = NULL;
567 struct rds_message *rm;
568
Andy Grover5c115592009-02-24 15:30:27 +0000569 while (!list_empty(messages)) {
Andy Grover561c7df2010-03-11 13:50:06 +0000570 int was_on_sock = 0;
571
Andy Grover5c115592009-02-24 15:30:27 +0000572 rm = list_entry(messages->next, struct rds_message,
573 m_conn_item);
574 list_del_init(&rm->m_conn_item);
575
576 /*
577 * If we see this flag cleared then we're *sure* that someone
578 * else beat us to removing it from the sock. If we race
579 * with their flag update we'll get the lock and then really
580 * see that the flag has been cleared.
581 *
582 * The message spinlock makes sure nobody clears rm->m_rs
583 * while we're messing with it. It does not prevent the
584 * message from being removed from the socket, though.
585 */
Andy Grover561c7df2010-03-11 13:50:06 +0000586 spin_lock_irqsave(&rm->m_rs_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000587 if (!test_bit(RDS_MSG_ON_SOCK, &rm->m_flags))
588 goto unlock_and_drop;
589
590 if (rs != rm->m_rs) {
591 if (rs) {
Andy Grover5c115592009-02-24 15:30:27 +0000592 rds_wake_sk_sleep(rs);
593 sock_put(rds_rs_to_sk(rs));
594 }
595 rs = rm->m_rs;
Andy Grover5c115592009-02-24 15:30:27 +0000596 sock_hold(rds_rs_to_sk(rs));
597 }
Tina Yang048c15e2010-03-11 13:50:00 +0000598 spin_lock(&rs->rs_lock);
Andy Grover5c115592009-02-24 15:30:27 +0000599
600 if (test_and_clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) {
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800601 struct rm_rdma_op *ro = &rm->rdma;
Andy Grover5c115592009-02-24 15:30:27 +0000602 struct rds_notifier *notifier;
603
604 list_del_init(&rm->m_sock_item);
605 rds_send_sndbuf_remove(rs, rm);
606
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800607 if (ro->op_active && ro->op_notifier &&
608 (ro->op_notify || (ro->op_recverr && status))) {
609 notifier = ro->op_notifier;
Andy Grover5c115592009-02-24 15:30:27 +0000610 list_add_tail(&notifier->n_list,
611 &rs->rs_notify_queue);
612 if (!notifier->n_status)
613 notifier->n_status = status;
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800614 rm->rdma.op_notifier = NULL;
Andy Grover5c115592009-02-24 15:30:27 +0000615 }
Andy Grover561c7df2010-03-11 13:50:06 +0000616 was_on_sock = 1;
Andy Grover5c115592009-02-24 15:30:27 +0000617 rm->m_rs = NULL;
618 }
Tina Yang048c15e2010-03-11 13:50:00 +0000619 spin_unlock(&rs->rs_lock);
Andy Grover5c115592009-02-24 15:30:27 +0000620
621unlock_and_drop:
Andy Grover561c7df2010-03-11 13:50:06 +0000622 spin_unlock_irqrestore(&rm->m_rs_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000623 rds_message_put(rm);
Andy Grover561c7df2010-03-11 13:50:06 +0000624 if (was_on_sock)
625 rds_message_put(rm);
Andy Grover5c115592009-02-24 15:30:27 +0000626 }
627
628 if (rs) {
Andy Grover5c115592009-02-24 15:30:27 +0000629 rds_wake_sk_sleep(rs);
630 sock_put(rds_rs_to_sk(rs));
631 }
Andy Grover5c115592009-02-24 15:30:27 +0000632}
633
634/*
635 * Transports call here when they've determined that the receiver queued
636 * messages up to, and including, the given sequence number. Messages are
637 * moved to the retrans queue when rds_send_xmit picks them off the send
638 * queue. This means that in the TCP case, the message may not have been
639 * assigned the m_ack_seq yet - but that's fine as long as tcp_is_acked
640 * checks the RDS_MSG_HAS_ACK_SEQ bit.
641 *
642 * XXX It's not clear to me how this is safely serialized with socket
643 * destruction. Maybe it should bail if it sees SOCK_DEAD.
644 */
645void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
646 is_acked_func is_acked)
647{
648 struct rds_message *rm, *tmp;
649 unsigned long flags;
650 LIST_HEAD(list);
651
652 spin_lock_irqsave(&conn->c_lock, flags);
653
654 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
655 if (!rds_send_is_acked(rm, ack, is_acked))
656 break;
657
658 list_move(&rm->m_conn_item, &list);
659 clear_bit(RDS_MSG_ON_CONN, &rm->m_flags);
660 }
661
662 /* order flag updates with spin locks */
663 if (!list_empty(&list))
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100664 smp_mb__after_atomic();
Andy Grover5c115592009-02-24 15:30:27 +0000665
666 spin_unlock_irqrestore(&conn->c_lock, flags);
667
668 /* now remove the messages from the sock list as needed */
669 rds_send_remove_from_sock(&list, RDS_RDMA_SUCCESS);
670}
Andy Grover616b7572009-08-21 12:28:32 +0000671EXPORT_SYMBOL_GPL(rds_send_drop_acked);
Andy Grover5c115592009-02-24 15:30:27 +0000672
673void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
674{
675 struct rds_message *rm, *tmp;
676 struct rds_connection *conn;
Andy Grover7c82eaf2010-02-19 18:01:41 -0800677 unsigned long flags;
Andy Grover5c115592009-02-24 15:30:27 +0000678 LIST_HEAD(list);
Andy Grover5c115592009-02-24 15:30:27 +0000679
680 /* get all the messages we're dropping under the rs lock */
681 spin_lock_irqsave(&rs->rs_lock, flags);
682
683 list_for_each_entry_safe(rm, tmp, &rs->rs_send_queue, m_sock_item) {
684 if (dest && (dest->sin_addr.s_addr != rm->m_daddr ||
685 dest->sin_port != rm->m_inc.i_hdr.h_dport))
686 continue;
687
Andy Grover5c115592009-02-24 15:30:27 +0000688 list_move(&rm->m_sock_item, &list);
689 rds_send_sndbuf_remove(rs, rm);
690 clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
Andy Grover5c115592009-02-24 15:30:27 +0000691 }
692
693 /* order flag updates with the rs lock */
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100694 smp_mb__after_atomic();
Andy Grover5c115592009-02-24 15:30:27 +0000695
696 spin_unlock_irqrestore(&rs->rs_lock, flags);
697
Andy Grover7c82eaf2010-02-19 18:01:41 -0800698 if (list_empty(&list))
699 return;
Andy Grover5c115592009-02-24 15:30:27 +0000700
Andy Grover7c82eaf2010-02-19 18:01:41 -0800701 /* Remove the messages from the conn */
Andy Grover5c115592009-02-24 15:30:27 +0000702 list_for_each_entry(rm, &list, m_sock_item) {
Andy Grover7c82eaf2010-02-19 18:01:41 -0800703
704 conn = rm->m_inc.i_conn;
Andy Grover7c82eaf2010-02-19 18:01:41 -0800705
Andy Grover9de08642010-03-29 16:50:54 -0700706 spin_lock_irqsave(&conn->c_lock, flags);
Andy Grover7c82eaf2010-02-19 18:01:41 -0800707 /*
708 * Maybe someone else beat us to removing rm from the conn.
709 * If we race with their flag update we'll get the lock and
710 * then really see that the flag has been cleared.
711 */
712 if (!test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags)) {
713 spin_unlock_irqrestore(&conn->c_lock, flags);
714 continue;
715 }
Andy Grover9de08642010-03-29 16:50:54 -0700716 list_del_init(&rm->m_conn_item);
717 spin_unlock_irqrestore(&conn->c_lock, flags);
Andy Grover7c82eaf2010-02-19 18:01:41 -0800718
719 /*
720 * Couldn't grab m_rs_lock in top loop (lock ordering),
721 * but we can now.
722 */
Andy Grover9de08642010-03-29 16:50:54 -0700723 spin_lock_irqsave(&rm->m_rs_lock, flags);
Andy Grover7c82eaf2010-02-19 18:01:41 -0800724
Tina Yang550a8002010-03-11 13:50:03 +0000725 spin_lock(&rs->rs_lock);
Andy Grover940786e2010-02-19 18:04:58 -0800726 __rds_send_complete(rs, rm, RDS_RDMA_CANCELED);
Tina Yang550a8002010-03-11 13:50:03 +0000727 spin_unlock(&rs->rs_lock);
Andy Grover7c82eaf2010-02-19 18:01:41 -0800728
Andy Grover5c115592009-02-24 15:30:27 +0000729 rm->m_rs = NULL;
Andy Grover9de08642010-03-29 16:50:54 -0700730 spin_unlock_irqrestore(&rm->m_rs_lock, flags);
Andy Grover5c115592009-02-24 15:30:27 +0000731
Andy Grover7c82eaf2010-02-19 18:01:41 -0800732 rds_message_put(rm);
Andy Grover5c115592009-02-24 15:30:27 +0000733 }
734
Andy Grover7c82eaf2010-02-19 18:01:41 -0800735 rds_wake_sk_sleep(rs);
Tina Yang550a8002010-03-11 13:50:03 +0000736
Andy Grover5c115592009-02-24 15:30:27 +0000737 while (!list_empty(&list)) {
738 rm = list_entry(list.next, struct rds_message, m_sock_item);
739 list_del_init(&rm->m_sock_item);
740
741 rds_message_wait(rm);
742 rds_message_put(rm);
743 }
744}
745
746/*
747 * we only want this to fire once so we use the callers 'queued'. It's
748 * possible that another thread can race with us and remove the
749 * message from the flow with RDS_CANCEL_SENT_TO.
750 */
751static int rds_send_queue_rm(struct rds_sock *rs, struct rds_connection *conn,
752 struct rds_message *rm, __be16 sport,
753 __be16 dport, int *queued)
754{
755 unsigned long flags;
756 u32 len;
757
758 if (*queued)
759 goto out;
760
761 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
762
763 /* this is the only place which holds both the socket's rs_lock
764 * and the connection's c_lock */
765 spin_lock_irqsave(&rs->rs_lock, flags);
766
767 /*
768 * If there is a little space in sndbuf, we don't queue anything,
769 * and userspace gets -EAGAIN. But poll() indicates there's send
770 * room. This can lead to bad behavior (spinning) if snd_bytes isn't
771 * freed up by incoming acks. So we check the *old* value of
772 * rs_snd_bytes here to allow the last msg to exceed the buffer,
773 * and poll() now knows no more data can be sent.
774 */
775 if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) {
776 rs->rs_snd_bytes += len;
777
778 /* let recv side know we are close to send space exhaustion.
779 * This is probably not the optimal way to do it, as this
780 * means we set the flag on *all* messages as soon as our
781 * throughput hits a certain threshold.
782 */
783 if (rs->rs_snd_bytes >= rds_sk_sndbuf(rs) / 2)
784 __set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
785
786 list_add_tail(&rm->m_sock_item, &rs->rs_send_queue);
787 set_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
788 rds_message_addref(rm);
789 rm->m_rs = rs;
790
791 /* The code ordering is a little weird, but we're
792 trying to minimize the time we hold c_lock */
793 rds_message_populate_header(&rm->m_inc.i_hdr, sport, dport, 0);
794 rm->m_inc.i_conn = conn;
795 rds_message_addref(rm);
796
797 spin_lock(&conn->c_lock);
798 rm->m_inc.i_hdr.h_sequence = cpu_to_be64(conn->c_next_tx_seq++);
799 list_add_tail(&rm->m_conn_item, &conn->c_send_queue);
800 set_bit(RDS_MSG_ON_CONN, &rm->m_flags);
801 spin_unlock(&conn->c_lock);
802
803 rdsdebug("queued msg %p len %d, rs %p bytes %d seq %llu\n",
804 rm, len, rs, rs->rs_snd_bytes,
805 (unsigned long long)be64_to_cpu(rm->m_inc.i_hdr.h_sequence));
806
807 *queued = 1;
808 }
809
810 spin_unlock_irqrestore(&rs->rs_lock, flags);
811out:
812 return *queued;
813}
814
Andy Groverfc445082010-01-12 12:56:06 -0800815/*
816 * rds_message is getting to be quite complicated, and we'd like to allocate
817 * it all in one go. This figures out how big it needs to be up front.
818 */
819static int rds_rm_size(struct msghdr *msg, int data_len)
820{
Andy Groverff87e972010-01-12 14:13:15 -0800821 struct cmsghdr *cmsg;
Andy Groverfc445082010-01-12 12:56:06 -0800822 int size = 0;
Andy Groveraa0a4ef2010-04-13 12:00:35 -0700823 int cmsg_groups = 0;
Andy Groverff87e972010-01-12 14:13:15 -0800824 int retval;
Andy Groverfc445082010-01-12 12:56:06 -0800825
Andy Groverff87e972010-01-12 14:13:15 -0800826 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
827 if (!CMSG_OK(msg, cmsg))
828 return -EINVAL;
829
830 if (cmsg->cmsg_level != SOL_RDS)
831 continue;
832
833 switch (cmsg->cmsg_type) {
834 case RDS_CMSG_RDMA_ARGS:
Andy Groveraa0a4ef2010-04-13 12:00:35 -0700835 cmsg_groups |= 1;
Andy Groverff87e972010-01-12 14:13:15 -0800836 retval = rds_rdma_extra_size(CMSG_DATA(cmsg));
837 if (retval < 0)
838 return retval;
839 size += retval;
Andy Groveraa0a4ef2010-04-13 12:00:35 -0700840
Andy Groverff87e972010-01-12 14:13:15 -0800841 break;
842
843 case RDS_CMSG_RDMA_DEST:
844 case RDS_CMSG_RDMA_MAP:
Andy Groveraa0a4ef2010-04-13 12:00:35 -0700845 cmsg_groups |= 2;
Andy Groverff87e972010-01-12 14:13:15 -0800846 /* these are valid but do no add any size */
847 break;
848
Andy Grover15133f62010-01-12 14:33:38 -0800849 case RDS_CMSG_ATOMIC_CSWP:
850 case RDS_CMSG_ATOMIC_FADD:
Andy Grover20c72bd2010-08-25 05:51:28 -0700851 case RDS_CMSG_MASKED_ATOMIC_CSWP:
852 case RDS_CMSG_MASKED_ATOMIC_FADD:
Andy Groveraa0a4ef2010-04-13 12:00:35 -0700853 cmsg_groups |= 1;
Andy Grover15133f62010-01-12 14:33:38 -0800854 size += sizeof(struct scatterlist);
855 break;
856
Andy Groverff87e972010-01-12 14:13:15 -0800857 default:
858 return -EINVAL;
859 }
860
861 }
862
863 size += ceil(data_len, PAGE_SIZE) * sizeof(struct scatterlist);
Andy Groverfc445082010-01-12 12:56:06 -0800864
Andy Groveraa0a4ef2010-04-13 12:00:35 -0700865 /* Ensure (DEST, MAP) are never used with (ARGS, ATOMIC) */
866 if (cmsg_groups == 3)
867 return -EINVAL;
868
Andy Groverfc445082010-01-12 12:56:06 -0800869 return size;
870}
871
Andy Grover5c115592009-02-24 15:30:27 +0000872static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
873 struct msghdr *msg, int *allocated_mr)
874{
875 struct cmsghdr *cmsg;
876 int ret = 0;
877
878 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
879 if (!CMSG_OK(msg, cmsg))
880 return -EINVAL;
881
882 if (cmsg->cmsg_level != SOL_RDS)
883 continue;
884
885 /* As a side effect, RDMA_DEST and RDMA_MAP will set
Andy Grover15133f62010-01-12 14:33:38 -0800886 * rm->rdma.m_rdma_cookie and rm->rdma.m_rdma_mr.
Andy Grover5c115592009-02-24 15:30:27 +0000887 */
888 switch (cmsg->cmsg_type) {
889 case RDS_CMSG_RDMA_ARGS:
890 ret = rds_cmsg_rdma_args(rs, rm, cmsg);
891 break;
892
893 case RDS_CMSG_RDMA_DEST:
894 ret = rds_cmsg_rdma_dest(rs, rm, cmsg);
895 break;
896
897 case RDS_CMSG_RDMA_MAP:
898 ret = rds_cmsg_rdma_map(rs, rm, cmsg);
899 if (!ret)
900 *allocated_mr = 1;
901 break;
Andy Grover15133f62010-01-12 14:33:38 -0800902 case RDS_CMSG_ATOMIC_CSWP:
903 case RDS_CMSG_ATOMIC_FADD:
Andy Grover20c72bd2010-08-25 05:51:28 -0700904 case RDS_CMSG_MASKED_ATOMIC_CSWP:
905 case RDS_CMSG_MASKED_ATOMIC_FADD:
Andy Grover15133f62010-01-12 14:33:38 -0800906 ret = rds_cmsg_atomic(rs, rm, cmsg);
907 break;
Andy Grover5c115592009-02-24 15:30:27 +0000908
909 default:
910 return -EINVAL;
911 }
912
913 if (ret)
914 break;
915 }
916
917 return ret;
918}
919
920int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
921 size_t payload_len)
922{
923 struct sock *sk = sock->sk;
924 struct rds_sock *rs = rds_sk_to_rs(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100925 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
Andy Grover5c115592009-02-24 15:30:27 +0000926 __be32 daddr;
927 __be16 dport;
928 struct rds_message *rm = NULL;
929 struct rds_connection *conn;
930 int ret = 0;
931 int queued = 0, allocated_mr = 0;
932 int nonblock = msg->msg_flags & MSG_DONTWAIT;
Andy Grover1123fd72010-03-11 13:49:56 +0000933 long timeo = sock_sndtimeo(sk, nonblock);
Andy Grover5c115592009-02-24 15:30:27 +0000934
935 /* Mirror Linux UDP mirror of BSD error message compatibility */
936 /* XXX: Perhaps MSG_MORE someday */
937 if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_CMSG_COMPAT)) {
Andy Grover5c115592009-02-24 15:30:27 +0000938 ret = -EOPNOTSUPP;
939 goto out;
940 }
941
942 if (msg->msg_namelen) {
943 /* XXX fail non-unicast destination IPs? */
944 if (msg->msg_namelen < sizeof(*usin) || usin->sin_family != AF_INET) {
945 ret = -EINVAL;
946 goto out;
947 }
948 daddr = usin->sin_addr.s_addr;
949 dport = usin->sin_port;
950 } else {
951 /* We only care about consistency with ->connect() */
952 lock_sock(sk);
953 daddr = rs->rs_conn_addr;
954 dport = rs->rs_conn_port;
955 release_sock(sk);
956 }
957
958 /* racing with another thread binding seems ok here */
959 if (daddr == 0 || rs->rs_bound_addr == 0) {
960 ret = -ENOTCONN; /* XXX not a great errno */
961 goto out;
962 }
963
Andy Groverfc445082010-01-12 12:56:06 -0800964 /* size of rm including all sgs */
965 ret = rds_rm_size(msg, payload_len);
966 if (ret < 0)
967 goto out;
968
969 rm = rds_message_alloc(ret, GFP_KERNEL);
970 if (!rm) {
971 ret = -ENOMEM;
Andy Grover5c115592009-02-24 15:30:27 +0000972 goto out;
973 }
974
Andy Grover372cd7d2010-02-03 19:40:32 -0800975 /* Attach data to the rm */
976 if (payload_len) {
977 rm->data.op_sg = rds_message_alloc_sgs(rm, ceil(payload_len, PAGE_SIZE));
Andy Groverd139ff02010-10-28 15:40:59 +0000978 if (!rm->data.op_sg) {
979 ret = -ENOMEM;
980 goto out;
981 }
Andy Grover372cd7d2010-02-03 19:40:32 -0800982 ret = rds_message_copy_from_user(rm, msg->msg_iov, payload_len);
983 if (ret)
984 goto out;
985 }
986 rm->data.op_active = 1;
Andy Groverfc445082010-01-12 12:56:06 -0800987
Andy Grover5c115592009-02-24 15:30:27 +0000988 rm->m_daddr = daddr;
989
Andy Grover5c115592009-02-24 15:30:27 +0000990 /* rds_conn_create has a spinlock that runs with IRQ off.
991 * Caching the conn in the socket helps a lot. */
992 if (rs->rs_conn && rs->rs_conn->c_faddr == daddr)
993 conn = rs->rs_conn;
994 else {
995 conn = rds_conn_create_outgoing(rs->rs_bound_addr, daddr,
996 rs->rs_transport,
997 sock->sk->sk_allocation);
998 if (IS_ERR(conn)) {
999 ret = PTR_ERR(conn);
1000 goto out;
1001 }
1002 rs->rs_conn = conn;
1003 }
1004
Andy Grover49f69692009-04-09 14:09:41 +00001005 /* Parse any control messages the user may have included. */
1006 ret = rds_cmsg_send(rs, rm, msg, &allocated_mr);
1007 if (ret)
1008 goto out;
1009
Andy Grover2c3a5f92010-03-01 16:10:40 -08001010 if (rm->rdma.op_active && !conn->c_trans->xmit_rdma) {
Manuel Zerpiescb0a6052011-06-16 02:09:57 +00001011 printk_ratelimited(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n",
Andy Groverf8b3aaf2010-03-01 14:11:53 -08001012 &rm->rdma, conn->c_trans->xmit_rdma);
Andy Grover15133f62010-01-12 14:33:38 -08001013 ret = -EOPNOTSUPP;
1014 goto out;
1015 }
1016
1017 if (rm->atomic.op_active && !conn->c_trans->xmit_atomic) {
Manuel Zerpiescb0a6052011-06-16 02:09:57 +00001018 printk_ratelimited(KERN_NOTICE "atomic_op %p conn xmit_atomic %p\n",
Andy Grover15133f62010-01-12 14:33:38 -08001019 &rm->atomic, conn->c_trans->xmit_atomic);
Andy Grover5c115592009-02-24 15:30:27 +00001020 ret = -EOPNOTSUPP;
1021 goto out;
1022 }
1023
Zach Brownf3c68082010-05-24 13:14:36 -07001024 rds_conn_connect_if_down(conn);
Andy Grover5c115592009-02-24 15:30:27 +00001025
1026 ret = rds_cong_wait(conn->c_fcong, dport, nonblock, rs);
Andy Groverb98ba522010-03-11 13:50:04 +00001027 if (ret) {
1028 rs->rs_seen_congestion = 1;
Andy Grover5c115592009-02-24 15:30:27 +00001029 goto out;
Andy Groverb98ba522010-03-11 13:50:04 +00001030 }
Andy Grover5c115592009-02-24 15:30:27 +00001031
1032 while (!rds_send_queue_rm(rs, conn, rm, rs->rs_bound_port,
1033 dport, &queued)) {
1034 rds_stats_inc(s_send_queue_full);
1035 /* XXX make sure this is reasonable */
1036 if (payload_len > rds_sk_sndbuf(rs)) {
1037 ret = -EMSGSIZE;
1038 goto out;
1039 }
1040 if (nonblock) {
1041 ret = -EAGAIN;
1042 goto out;
1043 }
1044
Eric Dumazetaa395142010-04-20 13:03:51 +00001045 timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
Andy Grover5c115592009-02-24 15:30:27 +00001046 rds_send_queue_rm(rs, conn, rm,
1047 rs->rs_bound_port,
1048 dport,
1049 &queued),
1050 timeo);
1051 rdsdebug("sendmsg woke queued %d timeo %ld\n", queued, timeo);
1052 if (timeo > 0 || timeo == MAX_SCHEDULE_TIMEOUT)
1053 continue;
1054
1055 ret = timeo;
1056 if (ret == 0)
1057 ret = -ETIMEDOUT;
1058 goto out;
1059 }
1060
1061 /*
1062 * By now we've committed to the send. We reuse rds_send_worker()
1063 * to retry sends in the rds thread if the transport asks us to.
1064 */
1065 rds_stats_inc(s_send_queued);
1066
1067 if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
Andy Grovera7d3a282010-03-29 16:20:18 -07001068 rds_send_xmit(conn);
Andy Grover5c115592009-02-24 15:30:27 +00001069
1070 rds_message_put(rm);
1071 return payload_len;
1072
1073out:
1074 /* If the user included a RDMA_MAP cmsg, we allocated a MR on the fly.
1075 * If the sendmsg goes through, we keep the MR. If it fails with EAGAIN
1076 * or in any other way, we need to destroy the MR again */
1077 if (allocated_mr)
1078 rds_rdma_unuse(rs, rds_rdma_cookie_key(rm->m_rdma_cookie), 1);
1079
1080 if (rm)
1081 rds_message_put(rm);
1082 return ret;
1083}
1084
1085/*
1086 * Reply to a ping packet.
1087 */
1088int
1089rds_send_pong(struct rds_connection *conn, __be16 dport)
1090{
1091 struct rds_message *rm;
1092 unsigned long flags;
1093 int ret = 0;
1094
1095 rm = rds_message_alloc(0, GFP_ATOMIC);
Andy Grover8690bfa2010-01-12 11:56:44 -08001096 if (!rm) {
Andy Grover5c115592009-02-24 15:30:27 +00001097 ret = -ENOMEM;
1098 goto out;
1099 }
1100
1101 rm->m_daddr = conn->c_faddr;
Andy Groveracfcd4d2010-03-31 18:56:25 -07001102 rm->data.op_active = 1;
Andy Grover5c115592009-02-24 15:30:27 +00001103
Zach Brownf3c68082010-05-24 13:14:36 -07001104 rds_conn_connect_if_down(conn);
Andy Grover5c115592009-02-24 15:30:27 +00001105
1106 ret = rds_cong_wait(conn->c_fcong, dport, 1, NULL);
1107 if (ret)
1108 goto out;
1109
1110 spin_lock_irqsave(&conn->c_lock, flags);
1111 list_add_tail(&rm->m_conn_item, &conn->c_send_queue);
1112 set_bit(RDS_MSG_ON_CONN, &rm->m_flags);
1113 rds_message_addref(rm);
1114 rm->m_inc.i_conn = conn;
1115
1116 rds_message_populate_header(&rm->m_inc.i_hdr, 0, dport,
1117 conn->c_next_tx_seq);
1118 conn->c_next_tx_seq++;
1119 spin_unlock_irqrestore(&conn->c_lock, flags);
1120
1121 rds_stats_inc(s_send_queued);
1122 rds_stats_inc(s_send_pong);
1123
Andy Groveracfcd4d2010-03-31 18:56:25 -07001124 if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
jeff.liu5175a5e2012-10-08 18:57:27 +00001125 queue_delayed_work(rds_wq, &conn->c_send_w, 0);
Andy Groveracfcd4d2010-03-31 18:56:25 -07001126
Andy Grover5c115592009-02-24 15:30:27 +00001127 rds_message_put(rm);
1128 return 0;
1129
1130out:
1131 if (rm)
1132 rds_message_put(rm);
1133 return ret;
1134}