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33#include <linux/kernel.h>
34#include <net/sock.h>
35#include <linux/in.h>
36#include <linux/list.h>
37
38#include "rds.h"
39#include "rdma.h"
40
41
42
43
44
45
46
47
48
49
50
51static int send_batch_count = 64;
52module_param(send_batch_count, int, 0444);
53MODULE_PARM_DESC(send_batch_count, " batch factor when working the send queue");
54
55
56
57
58void rds_send_reset(struct rds_connection *conn)
59{
60 struct rds_message *rm, *tmp;
61 unsigned long flags;
62
63 if (conn->c_xmit_rm) {
64
65
66
67
68 rds_message_unmapped(conn->c_xmit_rm);
69 rds_message_put(conn->c_xmit_rm);
70 conn->c_xmit_rm = NULL;
71 }
72 conn->c_xmit_sg = 0;
73 conn->c_xmit_hdr_off = 0;
74 conn->c_xmit_data_off = 0;
75 conn->c_xmit_rdma_sent = 0;
76
77 conn->c_map_queued = 0;
78
79 conn->c_unacked_packets = rds_sysctl_max_unacked_packets;
80 conn->c_unacked_bytes = rds_sysctl_max_unacked_bytes;
81
82
83 spin_lock_irqsave(&conn->c_lock, flags);
84 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
85 set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
86 set_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags);
87 }
88 list_splice_init(&conn->c_retrans, &conn->c_send_queue);
89 spin_unlock_irqrestore(&conn->c_lock, flags);
90}
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106int rds_send_xmit(struct rds_connection *conn)
107{
108 struct rds_message *rm;
109 unsigned long flags;
110 unsigned int tmp;
111 unsigned int send_quota = send_batch_count;
112 struct scatterlist *sg;
113 int ret = 0;
114 int was_empty = 0;
115 LIST_HEAD(to_be_dropped);
116
117
118
119
120
121
122
123
124
125
126
127
128 if (!mutex_trylock(&conn->c_send_lock)) {
129 rds_stats_inc(s_send_sem_contention);
130 ret = -ENOMEM;
131 goto out;
132 }
133
134 if (conn->c_trans->xmit_prepare)
135 conn->c_trans->xmit_prepare(conn);
136
137
138
139
140
141 while (--send_quota) {
142
143
144
145
146
147
148
149
150 if (conn->c_map_bytes) {
151 ret = conn->c_trans->xmit_cong_map(conn, conn->c_lcong,
152 conn->c_map_offset);
153 if (ret <= 0)
154 break;
155
156 conn->c_map_offset += ret;
157 conn->c_map_bytes -= ret;
158 if (conn->c_map_bytes)
159 continue;
160 }
161
162
163
164
165 rm = conn->c_xmit_rm;
166 if (rm != NULL &&
167 conn->c_xmit_hdr_off == sizeof(struct rds_header) &&
168 conn->c_xmit_sg == rm->m_nents) {
169 conn->c_xmit_rm = NULL;
170 conn->c_xmit_sg = 0;
171 conn->c_xmit_hdr_off = 0;
172 conn->c_xmit_data_off = 0;
173 conn->c_xmit_rdma_sent = 0;
174
175
176 rds_message_put(rm);
177 rm = NULL;
178 }
179
180
181
182 if (rm == NULL && test_and_clear_bit(0, &conn->c_map_queued)) {
183 if (conn->c_trans->xmit_cong_map != NULL) {
184 conn->c_map_offset = 0;
185 conn->c_map_bytes = sizeof(struct rds_header) +
186 RDS_CONG_MAP_BYTES;
187 continue;
188 }
189
190 rm = rds_cong_update_alloc(conn);
191 if (IS_ERR(rm)) {
192 ret = PTR_ERR(rm);
193 break;
194 }
195
196 conn->c_xmit_rm = rm;
197 }
198
199
200
201
202
203
204
205
206 if (rm == NULL) {
207 unsigned int len;
208
209 spin_lock_irqsave(&conn->c_lock, flags);
210
211 if (!list_empty(&conn->c_send_queue)) {
212 rm = list_entry(conn->c_send_queue.next,
213 struct rds_message,
214 m_conn_item);
215 rds_message_addref(rm);
216
217
218
219
220
221 list_move_tail(&rm->m_conn_item, &conn->c_retrans);
222 }
223
224 spin_unlock_irqrestore(&conn->c_lock, flags);
225
226 if (rm == NULL) {
227 was_empty = 1;
228 break;
229 }
230
231
232
233
234
235
236
237
238 if (rm->m_rdma_op
239 && test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags)) {
240 spin_lock_irqsave(&conn->c_lock, flags);
241 if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags))
242 list_move(&rm->m_conn_item, &to_be_dropped);
243 spin_unlock_irqrestore(&conn->c_lock, flags);
244 rds_message_put(rm);
245 continue;
246 }
247
248
249 len = ntohl(rm->m_inc.i_hdr.h_len);
250 if (conn->c_unacked_packets == 0
251 || conn->c_unacked_bytes < len) {
252 __set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
253
254 conn->c_unacked_packets = rds_sysctl_max_unacked_packets;
255 conn->c_unacked_bytes = rds_sysctl_max_unacked_bytes;
256 rds_stats_inc(s_send_ack_required);
257 } else {
258 conn->c_unacked_bytes -= len;
259 conn->c_unacked_packets--;
260 }
261
262 conn->c_xmit_rm = rm;
263 }
264
265
266
267
268
269
270 if (rm->m_rdma_op && !conn->c_xmit_rdma_sent) {
271 ret = conn->c_trans->xmit_rdma(conn, rm->m_rdma_op);
272 if (ret)
273 break;
274 conn->c_xmit_rdma_sent = 1;
275
276
277 set_bit(RDS_MSG_MAPPED, &rm->m_flags);
278 }
279
280 if (conn->c_xmit_hdr_off < sizeof(struct rds_header) ||
281 conn->c_xmit_sg < rm->m_nents) {
282 ret = conn->c_trans->xmit(conn, rm,
283 conn->c_xmit_hdr_off,
284 conn->c_xmit_sg,
285 conn->c_xmit_data_off);
286 if (ret <= 0)
287 break;
288
289 if (conn->c_xmit_hdr_off < sizeof(struct rds_header)) {
290 tmp = min_t(int, ret,
291 sizeof(struct rds_header) -
292 conn->c_xmit_hdr_off);
293 conn->c_xmit_hdr_off += tmp;
294 ret -= tmp;
295 }
296
297 sg = &rm->m_sg[conn->c_xmit_sg];
298 while (ret) {
299 tmp = min_t(int, ret, sg->length -
300 conn->c_xmit_data_off);
301 conn->c_xmit_data_off += tmp;
302 ret -= tmp;
303 if (conn->c_xmit_data_off == sg->length) {
304 conn->c_xmit_data_off = 0;
305 sg++;
306 conn->c_xmit_sg++;
307 BUG_ON(ret != 0 &&
308 conn->c_xmit_sg == rm->m_nents);
309 }
310 }
311 }
312 }
313
314
315 if (!list_empty(&to_be_dropped))
316 rds_send_remove_from_sock(&to_be_dropped, RDS_RDMA_DROPPED);
317
318 if (conn->c_trans->xmit_complete)
319 conn->c_trans->xmit_complete(conn);
320
321
322
323
324
325
326
327
328
329
330
331
332
333 mutex_unlock(&conn->c_send_lock);
334
335 if (conn->c_map_bytes || (send_quota == 0 && !was_empty)) {
336
337
338
339 ret = -EAGAIN;
340 }
341
342 if (ret == 0 && was_empty) {
343
344
345 spin_lock_irqsave(&conn->c_lock, flags);
346 if (!list_empty(&conn->c_send_queue)) {
347 rds_stats_inc(s_send_sem_queue_raced);
348 ret = -EAGAIN;
349 }
350 spin_unlock_irqrestore(&conn->c_lock, flags);
351 }
352out:
353 return ret;
354}
355
356static void rds_send_sndbuf_remove(struct rds_sock *rs, struct rds_message *rm)
357{
358 u32 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
359
360 assert_spin_locked(&rs->rs_lock);
361
362 BUG_ON(rs->rs_snd_bytes < len);
363 rs->rs_snd_bytes -= len;
364
365 if (rs->rs_snd_bytes == 0)
366 rds_stats_inc(s_send_queue_empty);
367}
368
369static inline int rds_send_is_acked(struct rds_message *rm, u64 ack,
370 is_acked_func is_acked)
371{
372 if (is_acked)
373 return is_acked(rm, ack);
374 return be64_to_cpu(rm->m_inc.i_hdr.h_sequence) <= ack;
375}
376
377
378
379
380
381
382int rds_send_acked_before(struct rds_connection *conn, u64 seq)
383{
384 struct rds_message *rm, *tmp;
385 int ret = 1;
386
387 spin_lock(&conn->c_lock);
388
389 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
390 if (be64_to_cpu(rm->m_inc.i_hdr.h_sequence) < seq)
391 ret = 0;
392 break;
393 }
394
395 list_for_each_entry_safe(rm, tmp, &conn->c_send_queue, m_conn_item) {
396 if (be64_to_cpu(rm->m_inc.i_hdr.h_sequence) < seq)
397 ret = 0;
398 break;
399 }
400
401 spin_unlock(&conn->c_lock);
402
403 return ret;
404}
405
406
407
408
409
410
411
412void rds_rdma_send_complete(struct rds_message *rm, int status)
413{
414 struct rds_sock *rs = NULL;
415 struct rds_rdma_op *ro;
416 struct rds_notifier *notifier;
417
418 spin_lock(&rm->m_rs_lock);
419
420 ro = rm->m_rdma_op;
421 if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags)
422 && ro && ro->r_notify && ro->r_notifier) {
423 notifier = ro->r_notifier;
424 rs = rm->m_rs;
425 sock_hold(rds_rs_to_sk(rs));
426
427 notifier->n_status = status;
428 spin_lock(&rs->rs_lock);
429 list_add_tail(¬ifier->n_list, &rs->rs_notify_queue);
430 spin_unlock(&rs->rs_lock);
431
432 ro->r_notifier = NULL;
433 }
434
435 spin_unlock(&rm->m_rs_lock);
436
437 if (rs) {
438 rds_wake_sk_sleep(rs);
439 sock_put(rds_rs_to_sk(rs));
440 }
441}
442EXPORT_SYMBOL_GPL(rds_rdma_send_complete);
443
444
445
446
447
448
449static inline void
450__rds_rdma_send_complete(struct rds_sock *rs, struct rds_message *rm, int status)
451{
452 struct rds_rdma_op *ro;
453
454 ro = rm->m_rdma_op;
455 if (ro && ro->r_notify && ro->r_notifier) {
456 ro->r_notifier->n_status = status;
457 list_add_tail(&ro->r_notifier->n_list, &rs->rs_notify_queue);
458 ro->r_notifier = NULL;
459 }
460
461
462}
463
464
465
466
467
468
469struct rds_message *rds_send_get_message(struct rds_connection *conn,
470 struct rds_rdma_op *op)
471{
472 struct rds_message *rm, *tmp, *found = NULL;
473 unsigned long flags;
474
475 spin_lock_irqsave(&conn->c_lock, flags);
476
477 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
478 if (rm->m_rdma_op == op) {
479 atomic_inc(&rm->m_refcount);
480 found = rm;
481 goto out;
482 }
483 }
484
485 list_for_each_entry_safe(rm, tmp, &conn->c_send_queue, m_conn_item) {
486 if (rm->m_rdma_op == op) {
487 atomic_inc(&rm->m_refcount);
488 found = rm;
489 break;
490 }
491 }
492
493out:
494 spin_unlock_irqrestore(&conn->c_lock, flags);
495
496 return found;
497}
498EXPORT_SYMBOL_GPL(rds_send_get_message);
499
500
501
502
503
504
505
506
507
508void rds_send_remove_from_sock(struct list_head *messages, int status)
509{
510 unsigned long flags = 0;
511 struct rds_sock *rs = NULL;
512 struct rds_message *rm;
513
514 local_irq_save(flags);
515 while (!list_empty(messages)) {
516 rm = list_entry(messages->next, struct rds_message,
517 m_conn_item);
518 list_del_init(&rm->m_conn_item);
519
520
521
522
523
524
525
526
527
528
529
530 spin_lock(&rm->m_rs_lock);
531 if (!test_bit(RDS_MSG_ON_SOCK, &rm->m_flags))
532 goto unlock_and_drop;
533
534 if (rs != rm->m_rs) {
535 if (rs) {
536 spin_unlock(&rs->rs_lock);
537 rds_wake_sk_sleep(rs);
538 sock_put(rds_rs_to_sk(rs));
539 }
540 rs = rm->m_rs;
541 spin_lock(&rs->rs_lock);
542 sock_hold(rds_rs_to_sk(rs));
543 }
544
545 if (test_and_clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) {
546 struct rds_rdma_op *ro = rm->m_rdma_op;
547 struct rds_notifier *notifier;
548
549 list_del_init(&rm->m_sock_item);
550 rds_send_sndbuf_remove(rs, rm);
551
552 if (ro && ro->r_notifier
553 && (status || ro->r_notify)) {
554 notifier = ro->r_notifier;
555 list_add_tail(¬ifier->n_list,
556 &rs->rs_notify_queue);
557 if (!notifier->n_status)
558 notifier->n_status = status;
559 rm->m_rdma_op->r_notifier = NULL;
560 }
561 rds_message_put(rm);
562 rm->m_rs = NULL;
563 }
564
565unlock_and_drop:
566 spin_unlock(&rm->m_rs_lock);
567 rds_message_put(rm);
568 }
569
570 if (rs) {
571 spin_unlock(&rs->rs_lock);
572 rds_wake_sk_sleep(rs);
573 sock_put(rds_rs_to_sk(rs));
574 }
575 local_irq_restore(flags);
576}
577
578
579
580
581
582
583
584
585
586
587
588
589void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
590 is_acked_func is_acked)
591{
592 struct rds_message *rm, *tmp;
593 unsigned long flags;
594 LIST_HEAD(list);
595
596 spin_lock_irqsave(&conn->c_lock, flags);
597
598 list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
599 if (!rds_send_is_acked(rm, ack, is_acked))
600 break;
601
602 list_move(&rm->m_conn_item, &list);
603 clear_bit(RDS_MSG_ON_CONN, &rm->m_flags);
604 }
605
606
607 if (!list_empty(&list))
608 smp_mb__after_clear_bit();
609
610 spin_unlock_irqrestore(&conn->c_lock, flags);
611
612
613 rds_send_remove_from_sock(&list, RDS_RDMA_SUCCESS);
614}
615EXPORT_SYMBOL_GPL(rds_send_drop_acked);
616
617void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
618{
619 struct rds_message *rm, *tmp;
620 struct rds_connection *conn;
621 unsigned long flags, flags2;
622 LIST_HEAD(list);
623 int wake = 0;
624
625
626 spin_lock_irqsave(&rs->rs_lock, flags);
627
628 list_for_each_entry_safe(rm, tmp, &rs->rs_send_queue, m_sock_item) {
629 if (dest && (dest->sin_addr.s_addr != rm->m_daddr ||
630 dest->sin_port != rm->m_inc.i_hdr.h_dport))
631 continue;
632
633 wake = 1;
634 list_move(&rm->m_sock_item, &list);
635 rds_send_sndbuf_remove(rs, rm);
636 clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
637
638
639 __rds_rdma_send_complete(rs, rm, RDS_RDMA_CANCELED);
640 }
641
642
643 if (wake)
644 smp_mb__after_clear_bit();
645
646 spin_unlock_irqrestore(&rs->rs_lock, flags);
647
648 if (wake)
649 rds_wake_sk_sleep(rs);
650
651 conn = NULL;
652
653
654 list_for_each_entry(rm, &list, m_sock_item) {
655
656
657 spin_lock_irqsave(&rm->m_rs_lock, flags2);
658 rm->m_rs = NULL;
659 spin_unlock_irqrestore(&rm->m_rs_lock, flags2);
660
661
662
663
664
665
666
667 if (!test_bit(RDS_MSG_ON_CONN, &rm->m_flags))
668 continue;
669
670 if (conn != rm->m_inc.i_conn) {
671 if (conn)
672 spin_unlock_irqrestore(&conn->c_lock, flags);
673 conn = rm->m_inc.i_conn;
674 spin_lock_irqsave(&conn->c_lock, flags);
675 }
676
677 if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags)) {
678 list_del_init(&rm->m_conn_item);
679 rds_message_put(rm);
680 }
681 }
682
683 if (conn)
684 spin_unlock_irqrestore(&conn->c_lock, flags);
685
686 while (!list_empty(&list)) {
687 rm = list_entry(list.next, struct rds_message, m_sock_item);
688 list_del_init(&rm->m_sock_item);
689
690 rds_message_wait(rm);
691 rds_message_put(rm);
692 }
693}
694
695
696
697
698
699
700static int rds_send_queue_rm(struct rds_sock *rs, struct rds_connection *conn,
701 struct rds_message *rm, __be16 sport,
702 __be16 dport, int *queued)
703{
704 unsigned long flags;
705 u32 len;
706
707 if (*queued)
708 goto out;
709
710 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
711
712
713
714 spin_lock_irqsave(&rs->rs_lock, flags);
715
716
717
718
719
720
721
722
723
724 if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) {
725 rs->rs_snd_bytes += len;
726
727
728
729
730
731
732 if (rs->rs_snd_bytes >= rds_sk_sndbuf(rs) / 2)
733 __set_bit(RDS_MSG_ACK_REQUIRED, &rm->m_flags);
734
735 list_add_tail(&rm->m_sock_item, &rs->rs_send_queue);
736 set_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
737 rds_message_addref(rm);
738 rm->m_rs = rs;
739
740
741
742 rds_message_populate_header(&rm->m_inc.i_hdr, sport, dport, 0);
743 rm->m_inc.i_conn = conn;
744 rds_message_addref(rm);
745
746 spin_lock(&conn->c_lock);
747 rm->m_inc.i_hdr.h_sequence = cpu_to_be64(conn->c_next_tx_seq++);
748 list_add_tail(&rm->m_conn_item, &conn->c_send_queue);
749 set_bit(RDS_MSG_ON_CONN, &rm->m_flags);
750 spin_unlock(&conn->c_lock);
751
752 rdsdebug("queued msg %p len %d, rs %p bytes %d seq %llu\n",
753 rm, len, rs, rs->rs_snd_bytes,
754 (unsigned long long)be64_to_cpu(rm->m_inc.i_hdr.h_sequence));
755
756 *queued = 1;
757 }
758
759 spin_unlock_irqrestore(&rs->rs_lock, flags);
760out:
761 return *queued;
762}
763
764static int rds_cmsg_send(struct rds_sock *rs, struct rds_message *rm,
765 struct msghdr *msg, int *allocated_mr)
766{
767 struct cmsghdr *cmsg;
768 int ret = 0;
769
770 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
771 if (!CMSG_OK(msg, cmsg))
772 return -EINVAL;
773
774 if (cmsg->cmsg_level != SOL_RDS)
775 continue;
776
777
778
779
780 switch (cmsg->cmsg_type) {
781 case RDS_CMSG_RDMA_ARGS:
782 ret = rds_cmsg_rdma_args(rs, rm, cmsg);
783 break;
784
785 case RDS_CMSG_RDMA_DEST:
786 ret = rds_cmsg_rdma_dest(rs, rm, cmsg);
787 break;
788
789 case RDS_CMSG_RDMA_MAP:
790 ret = rds_cmsg_rdma_map(rs, rm, cmsg);
791 if (!ret)
792 *allocated_mr = 1;
793 break;
794
795 default:
796 return -EINVAL;
797 }
798
799 if (ret)
800 break;
801 }
802
803 return ret;
804}
805
806int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
807 size_t payload_len)
808{
809 struct sock *sk = sock->sk;
810 struct rds_sock *rs = rds_sk_to_rs(sk);
811 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
812 __be32 daddr;
813 __be16 dport;
814 struct rds_message *rm = NULL;
815 struct rds_connection *conn;
816 int ret = 0;
817 int queued = 0, allocated_mr = 0;
818 int nonblock = msg->msg_flags & MSG_DONTWAIT;
819 long timeo = sock_rcvtimeo(sk, nonblock);
820
821
822
823 if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_CMSG_COMPAT)) {
824 printk(KERN_INFO "msg_flags 0x%08X\n", msg->msg_flags);
825 ret = -EOPNOTSUPP;
826 goto out;
827 }
828
829 if (msg->msg_namelen) {
830
831 if (msg->msg_namelen < sizeof(*usin) || usin->sin_family != AF_INET) {
832 ret = -EINVAL;
833 goto out;
834 }
835 daddr = usin->sin_addr.s_addr;
836 dport = usin->sin_port;
837 } else {
838
839 lock_sock(sk);
840 daddr = rs->rs_conn_addr;
841 dport = rs->rs_conn_port;
842 release_sock(sk);
843 }
844
845
846 if (daddr == 0 || rs->rs_bound_addr == 0) {
847 ret = -ENOTCONN;
848 goto out;
849 }
850
851 rm = rds_message_copy_from_user(msg->msg_iov, payload_len);
852 if (IS_ERR(rm)) {
853 ret = PTR_ERR(rm);
854 rm = NULL;
855 goto out;
856 }
857
858 rm->m_daddr = daddr;
859
860
861
862 if (rs->rs_conn && rs->rs_conn->c_faddr == daddr)
863 conn = rs->rs_conn;
864 else {
865 conn = rds_conn_create_outgoing(rs->rs_bound_addr, daddr,
866 rs->rs_transport,
867 sock->sk->sk_allocation);
868 if (IS_ERR(conn)) {
869 ret = PTR_ERR(conn);
870 goto out;
871 }
872 rs->rs_conn = conn;
873 }
874
875
876 ret = rds_cmsg_send(rs, rm, msg, &allocated_mr);
877 if (ret)
878 goto out;
879
880 if ((rm->m_rdma_cookie || rm->m_rdma_op)
881 && conn->c_trans->xmit_rdma == NULL) {
882 if (printk_ratelimit())
883 printk(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n",
884 rm->m_rdma_op, conn->c_trans->xmit_rdma);
885 ret = -EOPNOTSUPP;
886 goto out;
887 }
888
889
890
891
892
893 if (rds_conn_state(conn) == RDS_CONN_DOWN
894 && !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags))
895 queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
896
897 ret = rds_cong_wait(conn->c_fcong, dport, nonblock, rs);
898 if (ret)
899 goto out;
900
901 while (!rds_send_queue_rm(rs, conn, rm, rs->rs_bound_port,
902 dport, &queued)) {
903 rds_stats_inc(s_send_queue_full);
904
905 if (payload_len > rds_sk_sndbuf(rs)) {
906 ret = -EMSGSIZE;
907 goto out;
908 }
909 if (nonblock) {
910 ret = -EAGAIN;
911 goto out;
912 }
913
914 timeo = wait_event_interruptible_timeout(*sk->sk_sleep,
915 rds_send_queue_rm(rs, conn, rm,
916 rs->rs_bound_port,
917 dport,
918 &queued),
919 timeo);
920 rdsdebug("sendmsg woke queued %d timeo %ld\n", queued, timeo);
921 if (timeo > 0 || timeo == MAX_SCHEDULE_TIMEOUT)
922 continue;
923
924 ret = timeo;
925 if (ret == 0)
926 ret = -ETIMEDOUT;
927 goto out;
928 }
929
930
931
932
933
934 rds_stats_inc(s_send_queued);
935
936 if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
937 rds_send_worker(&conn->c_send_w.work);
938
939 rds_message_put(rm);
940 return payload_len;
941
942out:
943
944
945
946 if (allocated_mr)
947 rds_rdma_unuse(rs, rds_rdma_cookie_key(rm->m_rdma_cookie), 1);
948
949 if (rm)
950 rds_message_put(rm);
951 return ret;
952}
953
954
955
956
957int
958rds_send_pong(struct rds_connection *conn, __be16 dport)
959{
960 struct rds_message *rm;
961 unsigned long flags;
962 int ret = 0;
963
964 rm = rds_message_alloc(0, GFP_ATOMIC);
965 if (rm == NULL) {
966 ret = -ENOMEM;
967 goto out;
968 }
969
970 rm->m_daddr = conn->c_faddr;
971
972
973
974
975
976 if (rds_conn_state(conn) == RDS_CONN_DOWN
977 && !test_and_set_bit(RDS_RECONNECT_PENDING, &conn->c_flags))
978 queue_delayed_work(rds_wq, &conn->c_conn_w, 0);
979
980 ret = rds_cong_wait(conn->c_fcong, dport, 1, NULL);
981 if (ret)
982 goto out;
983
984 spin_lock_irqsave(&conn->c_lock, flags);
985 list_add_tail(&rm->m_conn_item, &conn->c_send_queue);
986 set_bit(RDS_MSG_ON_CONN, &rm->m_flags);
987 rds_message_addref(rm);
988 rm->m_inc.i_conn = conn;
989
990 rds_message_populate_header(&rm->m_inc.i_hdr, 0, dport,
991 conn->c_next_tx_seq);
992 conn->c_next_tx_seq++;
993 spin_unlock_irqrestore(&conn->c_lock, flags);
994
995 rds_stats_inc(s_send_queued);
996 rds_stats_inc(s_send_pong);
997
998 queue_delayed_work(rds_wq, &conn->c_send_w, 0);
999 rds_message_put(rm);
1000 return 0;
1001
1002out:
1003 if (rm)
1004 rds_message_put(rm);
1005 return ret;
1006}
1007