1 /* Management of Tx window, Tx resend, ACKs and out-of-sequence reception
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/module.h>
15 #include <linux/circ_buf.h>
16 #include <linux/net.h>
17 #include <linux/skbuff.h>
18 #include <linux/slab.h>
19 #include <linux/udp.h>
21 #include <net/af_rxrpc.h>
22 #include "ar-internal.h"
25 * propose an ACK be sent
27 void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
28 u16 skew, u32 serial, bool immediate)
31 s8 prior = rxrpc_ack_priority[ack_reason];
33 ASSERTCMP(prior, >, 0);
35 _enter("{%d},%s,%%%x,%u",
36 call->debug_id, rxrpc_acks(ack_reason), serial, immediate);
38 if (prior < rxrpc_ack_priority[call->ackr_reason]) {
44 /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
46 if (prior == rxrpc_ack_priority[call->ackr_reason]) {
48 call->ackr_skew = skew;
49 call->ackr_serial = serial;
56 call->ackr_reason = ack_reason;
57 call->ackr_serial = serial;
61 _debug("run delay timer");
62 expiry = rxrpc_soft_ack_delay;
67 _debug("run defer timer");
68 expiry = rxrpc_idle_ack_delay;
73 case RXRPC_ACK_REQUESTED:
74 expiry = rxrpc_requested_ack_delay;
77 if (!immediate || serial == 1) {
78 _debug("run defer timer");
83 _debug("immediate ACK");
89 if (!timer_pending(&call->ack_timer) ||
90 time_after(call->ack_timer.expires, expiry))
91 mod_timer(&call->ack_timer, expiry);
95 _debug("cancel timer %%%u", serial);
96 try_to_del_timer_sync(&call->ack_timer);
97 read_lock_bh(&call->state_lock);
98 if (call->state < RXRPC_CALL_COMPLETE &&
99 !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
100 rxrpc_queue_call(call);
101 read_unlock_bh(&call->state_lock);
105 * propose an ACK be sent, locking the call structure
107 void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
108 u16 skew, u32 serial, bool immediate)
110 s8 prior = rxrpc_ack_priority[ack_reason];
112 if (prior > rxrpc_ack_priority[call->ackr_reason]) {
113 spin_lock_bh(&call->lock);
114 __rxrpc_propose_ACK(call, ack_reason, skew, serial, immediate);
115 spin_unlock_bh(&call->lock);
120 * set the resend timer
122 static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend,
123 unsigned long resend_at)
125 read_lock_bh(&call->state_lock);
126 if (call->state == RXRPC_CALL_COMPLETE)
130 _debug("SET RESEND");
131 set_bit(RXRPC_CALL_EV_RESEND, &call->events);
135 _debug("MODIFY RESEND TIMER");
136 set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
137 mod_timer(&call->resend_timer, resend_at);
139 _debug("KILL RESEND TIMER");
140 del_timer_sync(&call->resend_timer);
141 clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
142 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
144 read_unlock_bh(&call->state_lock);
150 static void rxrpc_resend(struct rxrpc_call *call)
152 struct rxrpc_wire_header *whdr;
153 struct rxrpc_skb_priv *sp;
155 unsigned long *p_txb, resend_at;
160 _enter("{%d,%d,%d,%d},",
161 call->acks_hard, call->acks_unacked,
162 atomic_read(&call->sequence),
163 CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
169 for (loop = call->acks_tail;
170 loop != call->acks_head || stop;
171 loop = (loop + 1) & (call->acks_winsz - 1)
173 p_txb = call->acks_window + loop;
174 smp_read_barrier_depends();
178 txb = (struct sk_buff *) *p_txb;
181 if (sp->need_resend) {
182 sp->need_resend = false;
184 /* each Tx packet has a new serial number */
185 sp->hdr.serial = atomic_inc_return(&call->conn->serial);
187 whdr = (struct rxrpc_wire_header *)txb->head;
188 whdr->serial = htonl(sp->hdr.serial);
190 _proto("Tx DATA %%%u { #%d }",
191 sp->hdr.serial, sp->hdr.seq);
192 if (rxrpc_send_data_packet(call->conn, txb) < 0) {
194 sp->resend_at = jiffies + 3;
196 if (rxrpc_is_client_call(call))
197 rxrpc_expose_client_call(call);
199 jiffies + rxrpc_resend_timeout;
203 if (time_after_eq(jiffies + 1, sp->resend_at)) {
204 sp->need_resend = true;
206 } else if (resend & 2) {
207 if (time_before(sp->resend_at, resend_at))
208 resend_at = sp->resend_at;
210 resend_at = sp->resend_at;
215 rxrpc_set_resend(call, resend, resend_at);
220 * handle resend timer expiry
222 static void rxrpc_resend_timer(struct rxrpc_call *call)
224 struct rxrpc_skb_priv *sp;
226 unsigned long *p_txb, resend_at;
231 call->acks_tail, call->acks_unacked, call->acks_head);
233 if (call->state == RXRPC_CALL_COMPLETE)
239 for (loop = call->acks_unacked;
240 loop != call->acks_head;
241 loop = (loop + 1) & (call->acks_winsz - 1)
243 p_txb = call->acks_window + loop;
244 smp_read_barrier_depends();
245 txb = (struct sk_buff *) (*p_txb & ~1);
248 ASSERT(!(*p_txb & 1));
250 if (sp->need_resend) {
252 } else if (time_after_eq(jiffies + 1, sp->resend_at)) {
253 sp->need_resend = true;
255 } else if (resend & 2) {
256 if (time_before(sp->resend_at, resend_at))
257 resend_at = sp->resend_at;
259 resend_at = sp->resend_at;
264 rxrpc_set_resend(call, resend, resend_at);
269 * process soft ACKs of our transmitted packets
270 * - these indicate packets the peer has or has not received, but hasn't yet
271 * given to the consumer, and so can still be discarded and re-requested
273 static int rxrpc_process_soft_ACKs(struct rxrpc_call *call,
274 struct rxrpc_ackpacket *ack,
277 struct rxrpc_skb_priv *sp;
279 unsigned long *p_txb, resend_at;
281 u8 sacks[RXRPC_MAXACKS], resend;
283 _enter("{%d,%d},{%d},",
285 CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz),
288 if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0)
293 for (loop = 0; loop < ack->nAcks; loop++) {
294 p_txb = call->acks_window;
295 p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1);
296 smp_read_barrier_depends();
297 txb = (struct sk_buff *) (*p_txb & ~1);
300 switch (sacks[loop]) {
301 case RXRPC_ACK_TYPE_ACK:
302 sp->need_resend = false;
305 case RXRPC_ACK_TYPE_NACK:
306 sp->need_resend = true;
311 _debug("Unsupported ACK type %d", sacks[loop]);
317 call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1);
319 /* anything not explicitly ACK'd is implicitly NACK'd, but may just not
320 * have been received or processed yet by the far end */
321 for (loop = call->acks_unacked;
322 loop != call->acks_head;
323 loop = (loop + 1) & (call->acks_winsz - 1)
325 p_txb = call->acks_window + loop;
326 smp_read_barrier_depends();
327 txb = (struct sk_buff *) (*p_txb & ~1);
331 /* packet must have been discarded */
332 sp->need_resend = true;
335 } else if (sp->need_resend) {
337 } else if (time_after_eq(jiffies + 1, sp->resend_at)) {
338 sp->need_resend = true;
340 } else if (resend & 2) {
341 if (time_before(sp->resend_at, resend_at))
342 resend_at = sp->resend_at;
344 resend_at = sp->resend_at;
349 rxrpc_set_resend(call, resend, resend_at);
354 _leave(" = -EPROTO");
359 * discard hard-ACK'd packets from the Tx window
361 static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard)
364 int tail = call->acks_tail, old_tail;
365 int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz);
367 _enter("{%u,%u},%u", call->acks_hard, win, hard);
369 ASSERTCMP(hard - call->acks_hard, <=, win);
371 while (call->acks_hard < hard) {
372 smp_read_barrier_depends();
373 _skb = call->acks_window[tail] & ~1;
374 rxrpc_free_skb((struct sk_buff *) _skb);
376 tail = (tail + 1) & (call->acks_winsz - 1);
377 call->acks_tail = tail;
378 if (call->acks_unacked == old_tail)
379 call->acks_unacked = tail;
383 wake_up(&call->waitq);
387 * clear the Tx window in the event of a failure
389 static void rxrpc_clear_tx_window(struct rxrpc_call *call)
391 rxrpc_rotate_tx_window(call, atomic_read(&call->sequence));
395 * drain the out of sequence received packet queue into the packet Rx queue
397 static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call)
399 struct rxrpc_skb_priv *sp;
404 _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos);
406 spin_lock_bh(&call->lock);
409 if (test_bit(RXRPC_CALL_RELEASED, &call->flags))
410 goto socket_unavailable;
412 skb = skb_dequeue(&call->rx_oos_queue);
417 _debug("drain OOS packet %d [%d]",
418 sp->hdr.seq, call->rx_first_oos);
420 if (sp->hdr.seq != call->rx_first_oos) {
421 skb_queue_head(&call->rx_oos_queue, skb);
422 call->rx_first_oos = rxrpc_skb(skb)->hdr.seq;
423 _debug("requeue %p {%u}", skb, call->rx_first_oos);
425 skb->mark = RXRPC_SKB_MARK_DATA;
426 terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
427 !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
428 ret = rxrpc_queue_rcv_skb(call, skb, true, terminal);
430 _debug("drain #%u", call->rx_data_post);
431 call->rx_data_post++;
433 /* find out what the next packet is */
434 skb = skb_peek(&call->rx_oos_queue);
437 call->rx_first_oos = rxrpc_skb(skb)->hdr.seq;
439 call->rx_first_oos = 0;
440 _debug("peek %p {%u}", skb, call->rx_first_oos);
446 spin_unlock_bh(&call->lock);
447 _leave(" = %d", ret);
452 * insert an out of sequence packet into the buffer
454 static void rxrpc_insert_oos_packet(struct rxrpc_call *call,
457 struct rxrpc_skb_priv *sp, *psp;
463 _enter(",,{%u}", seq);
465 skb->destructor = rxrpc_packet_destructor;
466 ASSERTCMP(sp->call, ==, NULL);
468 rxrpc_get_call_for_skb(call, skb);
470 /* insert into the buffer in sequence order */
471 spin_lock_bh(&call->lock);
473 skb_queue_walk(&call->rx_oos_queue, p) {
475 if (psp->hdr.seq > seq) {
476 _debug("insert oos #%u before #%u", seq, psp->hdr.seq);
477 skb_insert(p, skb, &call->rx_oos_queue);
482 _debug("append oos #%u", seq);
483 skb_queue_tail(&call->rx_oos_queue, skb);
486 /* we might now have a new front to the queue */
487 if (call->rx_first_oos == 0 || seq < call->rx_first_oos)
488 call->rx_first_oos = seq;
490 read_lock(&call->state_lock);
491 if (call->state < RXRPC_CALL_COMPLETE &&
492 call->rx_data_post == call->rx_first_oos) {
493 _debug("drain rx oos now");
494 set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events);
496 read_unlock(&call->state_lock);
498 spin_unlock_bh(&call->lock);
499 _leave(" [stored #%u]", call->rx_first_oos);
503 * clear the Tx window on final ACK reception
505 static void rxrpc_zap_tx_window(struct rxrpc_call *call)
507 struct rxrpc_skb_priv *sp;
509 unsigned long _skb, *acks_window;
510 u8 winsz = call->acks_winsz;
513 acks_window = call->acks_window;
514 call->acks_window = NULL;
516 while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) {
517 tail = call->acks_tail;
518 smp_read_barrier_depends();
519 _skb = acks_window[tail] & ~1;
521 call->acks_tail = (call->acks_tail + 1) & (winsz - 1);
523 skb = (struct sk_buff *) _skb;
525 _debug("+++ clear Tx %u", sp->hdr.seq);
533 * process the extra information that may be appended to an ACK packet
535 static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
536 unsigned int latest, int nAcks)
538 struct rxrpc_ackinfo ackinfo;
539 struct rxrpc_peer *peer;
542 if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) {
543 _leave(" [no ackinfo]");
547 _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
549 ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU),
550 ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max));
552 mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU));
555 if (mtu < peer->maxdata) {
556 spin_lock_bh(&peer->lock);
558 peer->mtu = mtu + peer->hdrsize;
559 spin_unlock_bh(&peer->lock);
560 _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata);
565 * process packets in the reception queue
567 static int rxrpc_process_rx_queue(struct rxrpc_call *call,
570 struct rxrpc_ackpacket ack;
571 struct rxrpc_skb_priv *sp;
580 skb = skb_dequeue(&call->rx_queue);
585 _net("deferred skb %p", skb);
589 _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state);
593 switch (sp->hdr.type) {
594 /* data packets that wind up here have been received out of
595 * order, need security processing or are jumbo packets */
596 case RXRPC_PACKET_TYPE_DATA:
597 _proto("OOSQ DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq);
599 /* secured packets must be verified and possibly decrypted */
600 if (call->conn->security->verify_packet(call, skb,
604 rxrpc_insert_oos_packet(call, skb);
605 goto process_further;
607 /* partial ACK to process */
608 case RXRPC_PACKET_TYPE_ACK:
609 if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) {
610 _debug("extraction failure");
613 if (!skb_pull(skb, sizeof(ack)))
616 latest = sp->hdr.serial;
617 hard = ntohl(ack.firstPacket);
618 tx = atomic_read(&call->sequence);
620 _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
624 ntohl(ack.previousPacket),
626 rxrpc_acks(ack.reason),
629 rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks);
631 if (ack.reason == RXRPC_ACK_PING) {
632 _proto("Rx ACK %%%u PING Request", latest);
633 rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
634 skb->priority, sp->hdr.serial, true);
637 /* discard any out-of-order or duplicate ACKs */
638 if (latest - call->acks_latest <= 0) {
639 _debug("discard ACK %d <= %d",
640 latest, call->acks_latest);
643 call->acks_latest = latest;
645 if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
646 call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY &&
647 call->state != RXRPC_CALL_SERVER_SEND_REPLY &&
648 call->state != RXRPC_CALL_SERVER_AWAIT_ACK)
651 _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state);
655 _debug("hard-ACK'd packet %d not transmitted"
661 if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY ||
662 call->state == RXRPC_CALL_SERVER_AWAIT_ACK) &&
664 call->acks_hard = tx;
669 rxrpc_rotate_tx_window(call, hard - 1);
673 if (hard - 1 + ack.nAcks > tx) {
674 _debug("soft-ACK'd packet %d+%d not"
675 " transmitted (%d top)",
676 hard - 1, ack.nAcks, tx);
680 if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0)
685 /* complete ACK to process */
686 case RXRPC_PACKET_TYPE_ACKALL:
689 /* abort and busy are handled elsewhere */
690 case RXRPC_PACKET_TYPE_BUSY:
691 case RXRPC_PACKET_TYPE_ABORT:
694 /* connection level events - also handled elsewhere */
695 case RXRPC_PACKET_TYPE_CHALLENGE:
696 case RXRPC_PACKET_TYPE_RESPONSE:
697 case RXRPC_PACKET_TYPE_DEBUG:
701 /* if we've had a hard ACK that covers all the packets we've sent, then
702 * that ends that phase of the operation */
704 write_lock_bh(&call->state_lock);
705 _debug("ack all %d", call->state);
707 switch (call->state) {
708 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
709 call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
711 case RXRPC_CALL_SERVER_AWAIT_ACK:
712 _debug("srv complete");
713 __rxrpc_call_completed(call);
716 case RXRPC_CALL_CLIENT_SEND_REQUEST:
717 case RXRPC_CALL_SERVER_RECV_REQUEST:
718 goto protocol_error_unlock; /* can't occur yet */
720 write_unlock_bh(&call->state_lock);
721 goto discard; /* assume packet left over from earlier phase */
724 write_unlock_bh(&call->state_lock);
726 /* if all the packets we sent are hard-ACK'd, then we can discard
727 * whatever we've got left */
728 _debug("clear Tx %d",
729 CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
731 del_timer_sync(&call->resend_timer);
732 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
733 clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events);
735 if (call->acks_window)
736 rxrpc_zap_tx_window(call);
739 /* post the final ACK message for userspace to pick up */
741 skb->mark = RXRPC_SKB_MARK_FINAL_ACK;
743 rxrpc_get_call_for_skb(call, skb);
744 spin_lock_bh(&call->lock);
745 if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0)
747 spin_unlock_bh(&call->lock);
748 goto process_further;
753 goto process_further;
755 protocol_error_unlock:
756 write_unlock_bh(&call->state_lock);
759 _leave(" = -EPROTO");
764 * post a message to the socket Rx queue for recvmsg() to pick up
766 static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error,
769 struct rxrpc_skb_priv *sp;
773 _enter("{%d,%lx},%u,%u,%d",
774 call->debug_id, call->flags, mark, error, fatal);
776 /* remove timers and things for fatal messages */
778 del_timer_sync(&call->resend_timer);
779 del_timer_sync(&call->ack_timer);
780 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
783 if (mark != RXRPC_SKB_MARK_NEW_CALL &&
784 !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
785 _leave("[no userid]");
789 if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
790 skb = alloc_skb(0, GFP_NOFS);
799 memset(sp, 0, sizeof(*sp));
802 rxrpc_get_call_for_skb(call, skb);
804 spin_lock_bh(&call->lock);
805 ret = rxrpc_queue_rcv_skb(call, skb, true, fatal);
806 spin_unlock_bh(&call->lock);
814 * handle background processing of incoming call packets and ACK / abort
817 void rxrpc_process_call(struct work_struct *work)
819 struct rxrpc_call *call =
820 container_of(work, struct rxrpc_call, processor);
821 struct rxrpc_wire_header whdr;
822 struct rxrpc_ackpacket ack;
823 struct rxrpc_ackinfo ackinfo;
826 enum rxrpc_call_event genbit;
830 int loop, nbit, ioc, ret, mtu;
831 u32 serial, abort_code = RX_PROTOCOL_ERROR;
834 rxrpc_see_call(call);
836 //printk("\n--------------------\n");
837 _enter("{%d,%s,%lx} [%lu]",
838 call->debug_id, rxrpc_call_states[call->state], call->events,
839 (jiffies - call->creation_jif) / (HZ / 10));
844 /* there's a good chance we're going to have to send a message, so set
845 * one up in advance */
846 msg.msg_name = &call->peer->srx.transport;
847 msg.msg_namelen = call->peer->srx.transport_len;
848 msg.msg_control = NULL;
849 msg.msg_controllen = 0;
852 whdr.epoch = htonl(call->conn->proto.epoch);
853 whdr.cid = htonl(call->cid);
854 whdr.callNumber = htonl(call->call_id);
856 whdr.type = RXRPC_PACKET_TYPE_ACK;
857 whdr.flags = call->conn->out_clientflag;
859 whdr.securityIndex = call->conn->security_ix;
861 whdr.serviceId = htons(call->service_id);
863 memset(iov, 0, sizeof(iov));
864 iov[0].iov_base = &whdr;
865 iov[0].iov_len = sizeof(whdr);
868 /* deal with events of a final nature */
869 if (test_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events)) {
870 enum rxrpc_skb_mark mark;
873 clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events);
874 clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events);
875 clear_bit(RXRPC_CALL_EV_ABORT, &call->events);
877 if (call->completion == RXRPC_CALL_NETWORK_ERROR) {
878 mark = RXRPC_SKB_MARK_NET_ERROR;
879 _debug("post net error %d", error);
881 mark = RXRPC_SKB_MARK_LOCAL_ERROR;
882 _debug("post net local error %d", error);
885 if (rxrpc_post_message(call, mark, call->error, true) < 0)
887 clear_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events);
891 if (test_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events)) {
892 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
894 clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events);
895 clear_bit(RXRPC_CALL_EV_ABORT, &call->events);
897 _debug("post conn abort");
899 if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
900 call->error, true) < 0)
902 clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events);
906 if (test_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) {
907 whdr.type = RXRPC_PACKET_TYPE_BUSY;
908 genbit = RXRPC_CALL_EV_REJECT_BUSY;
912 if (test_bit(RXRPC_CALL_EV_ABORT, &call->events)) {
913 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
915 if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
916 call->error, true) < 0)
918 whdr.type = RXRPC_PACKET_TYPE_ABORT;
919 data = htonl(call->abort_code);
920 iov[1].iov_base = &data;
921 iov[1].iov_len = sizeof(data);
922 genbit = RXRPC_CALL_EV_ABORT;
926 if (test_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) {
927 genbit = RXRPC_CALL_EV_ACK_FINAL;
929 ack.bufferSpace = htons(8);
932 ack.reason = RXRPC_ACK_IDLE;
934 call->ackr_reason = 0;
936 spin_lock_bh(&call->lock);
937 ack.serial = htonl(call->ackr_serial);
938 ack.previousPacket = htonl(call->ackr_prev_seq);
939 ack.firstPacket = htonl(call->rx_data_eaten + 1);
940 spin_unlock_bh(&call->lock);
944 iov[1].iov_base = &ack;
945 iov[1].iov_len = sizeof(ack);
946 iov[2].iov_base = &pad;
948 iov[3].iov_base = &ackinfo;
949 iov[3].iov_len = sizeof(ackinfo);
953 if (call->events & ((1 << RXRPC_CALL_EV_RCVD_BUSY) |
954 (1 << RXRPC_CALL_EV_RCVD_ABORT))
958 if (test_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events))
959 mark = RXRPC_SKB_MARK_REMOTE_ABORT;
961 mark = RXRPC_SKB_MARK_BUSY;
963 _debug("post abort/busy");
964 rxrpc_clear_tx_window(call);
965 if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0)
968 clear_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events);
969 clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
973 if (test_and_clear_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events)) {
974 _debug("do implicit ackall");
975 rxrpc_clear_tx_window(call);
978 if (test_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events)) {
979 rxrpc_abort_call(call, RX_CALL_TIMEOUT, ETIME);
981 _debug("post timeout");
982 if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
986 clear_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events);
990 /* deal with assorted inbound messages */
991 if (!skb_queue_empty(&call->rx_queue)) {
992 ret = rxrpc_process_rx_queue(call, &abort_code);
1002 rxrpc_abort_call(call, abort_code, -ret);
1007 /* handle resending */
1008 if (test_and_clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
1009 rxrpc_resend_timer(call);
1010 if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events))
1013 /* consider sending an ordinary ACK */
1014 if (test_bit(RXRPC_CALL_EV_ACK, &call->events)) {
1015 _debug("send ACK: window: %d - %d { %lx }",
1016 call->rx_data_eaten, call->ackr_win_top,
1017 call->ackr_window[0]);
1019 if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST &&
1020 call->ackr_reason != RXRPC_ACK_PING_RESPONSE) {
1021 /* ACK by sending reply DATA packet in this state */
1022 clear_bit(RXRPC_CALL_EV_ACK, &call->events);
1023 goto maybe_reschedule;
1026 genbit = RXRPC_CALL_EV_ACK;
1028 acks = kzalloc(call->ackr_win_top - call->rx_data_eaten,
1033 //hdr.flags = RXRPC_SLOW_START_OK;
1034 ack.bufferSpace = htons(8);
1037 spin_lock_bh(&call->lock);
1038 ack.reason = call->ackr_reason;
1039 ack.serial = htonl(call->ackr_serial);
1040 ack.previousPacket = htonl(call->ackr_prev_seq);
1041 ack.firstPacket = htonl(call->rx_data_eaten + 1);
1044 for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) {
1045 nbit = loop * BITS_PER_LONG;
1046 for (bits = call->ackr_window[loop]; bits; bits >>= 1
1048 _debug("- l=%d n=%d b=%lx", loop, nbit, bits);
1050 acks[nbit] = RXRPC_ACK_TYPE_ACK;
1051 ack.nAcks = nbit + 1;
1056 call->ackr_reason = 0;
1057 spin_unlock_bh(&call->lock);
1061 iov[1].iov_base = &ack;
1062 iov[1].iov_len = sizeof(ack);
1063 iov[2].iov_base = acks;
1064 iov[2].iov_len = ack.nAcks;
1065 iov[3].iov_base = &pad;
1067 iov[4].iov_base = &ackinfo;
1068 iov[4].iov_len = sizeof(ackinfo);
1070 switch (ack.reason) {
1071 case RXRPC_ACK_REQUESTED:
1072 case RXRPC_ACK_DUPLICATE:
1073 case RXRPC_ACK_OUT_OF_SEQUENCE:
1074 case RXRPC_ACK_EXCEEDS_WINDOW:
1075 case RXRPC_ACK_NOSPACE:
1076 case RXRPC_ACK_PING:
1077 case RXRPC_ACK_PING_RESPONSE:
1078 goto send_ACK_with_skew;
1079 case RXRPC_ACK_DELAY:
1080 case RXRPC_ACK_IDLE:
1085 /* handle completion of security negotiations on an incoming
1087 if (test_and_clear_bit(RXRPC_CALL_EV_SECURED, &call->events)) {
1089 spin_lock_bh(&call->lock);
1091 if (call->state == RXRPC_CALL_SERVER_SECURING) {
1093 write_lock(&call->socket->call_lock);
1094 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
1095 !test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) {
1096 _debug("not released");
1097 call->state = RXRPC_CALL_SERVER_ACCEPTING;
1098 list_move_tail(&call->accept_link,
1099 &call->socket->acceptq);
1101 write_unlock(&call->socket->call_lock);
1102 read_lock(&call->state_lock);
1103 if (call->state < RXRPC_CALL_COMPLETE)
1104 set_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events);
1105 read_unlock(&call->state_lock);
1108 spin_unlock_bh(&call->lock);
1109 if (!test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events))
1110 goto maybe_reschedule;
1113 /* post a notification of an acceptable connection to the app */
1114 if (test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) {
1115 _debug("post accept");
1116 if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL,
1119 clear_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events);
1120 goto maybe_reschedule;
1123 /* handle incoming call acceptance */
1124 if (test_and_clear_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) {
1126 ASSERTCMP(call->rx_data_post, ==, 0);
1127 call->rx_data_post = 1;
1128 read_lock_bh(&call->state_lock);
1129 if (call->state < RXRPC_CALL_COMPLETE)
1130 set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events);
1131 read_unlock_bh(&call->state_lock);
1134 /* drain the out of sequence received packet queue into the packet Rx
1136 if (test_and_clear_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) {
1137 while (call->rx_data_post == call->rx_first_oos)
1138 if (rxrpc_drain_rx_oos_queue(call) < 0)
1140 goto maybe_reschedule;
1143 if (test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) {
1144 rxrpc_release_call(call);
1145 clear_bit(RXRPC_CALL_EV_RELEASE, &call->events);
1148 /* other events may have been raised since we started checking */
1149 goto maybe_reschedule;
1152 ack.maxSkew = htons(call->ackr_skew);
1154 mtu = call->peer->if_mtu;
1155 mtu -= call->peer->hdrsize;
1156 ackinfo.maxMTU = htonl(mtu);
1157 ackinfo.rwind = htonl(rxrpc_rx_window_size);
1159 /* permit the peer to send us jumbo packets if it wants to */
1160 ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
1161 ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max);
1163 serial = atomic_inc_return(&call->conn->serial);
1164 whdr.serial = htonl(serial);
1165 _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
1168 ntohl(ack.firstPacket),
1169 ntohl(ack.previousPacket),
1171 rxrpc_acks(ack.reason),
1174 del_timer_sync(&call->ack_timer);
1176 set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags);
1177 goto send_message_2;
1180 _debug("send message");
1182 serial = atomic_inc_return(&call->conn->serial);
1183 whdr.serial = htonl(serial);
1184 _proto("Tx %s %%%u", rxrpc_pkts[whdr.type], serial);
1187 len = iov[0].iov_len;
1189 if (iov[4].iov_len) {
1191 len += iov[4].iov_len;
1192 len += iov[3].iov_len;
1193 len += iov[2].iov_len;
1194 len += iov[1].iov_len;
1195 } else if (iov[3].iov_len) {
1197 len += iov[3].iov_len;
1198 len += iov[2].iov_len;
1199 len += iov[1].iov_len;
1200 } else if (iov[2].iov_len) {
1202 len += iov[2].iov_len;
1203 len += iov[1].iov_len;
1204 } else if (iov[1].iov_len) {
1206 len += iov[1].iov_len;
1209 ret = kernel_sendmsg(call->conn->params.local->socket,
1210 &msg, iov, ioc, len);
1212 _debug("sendmsg failed: %d", ret);
1213 read_lock_bh(&call->state_lock);
1214 if (call->state < RXRPC_CALL_DEAD)
1215 rxrpc_queue_call(call);
1216 read_unlock_bh(&call->state_lock);
1221 case RXRPC_CALL_EV_ABORT:
1222 clear_bit(genbit, &call->events);
1223 clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
1226 case RXRPC_CALL_EV_ACK_FINAL:
1227 rxrpc_call_completed(call);
1231 clear_bit(genbit, &call->events);
1232 switch (call->state) {
1233 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
1234 case RXRPC_CALL_CLIENT_RECV_REPLY:
1235 case RXRPC_CALL_SERVER_RECV_REQUEST:
1236 case RXRPC_CALL_SERVER_ACK_REQUEST:
1237 _debug("start ACK timer");
1238 rxrpc_propose_ACK(call, RXRPC_ACK_DELAY,
1239 call->ackr_skew, call->ackr_serial,
1244 goto maybe_reschedule;
1248 del_timer_sync(&call->ack_timer);
1249 if (test_and_clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events))
1250 rxrpc_put_call(call);
1251 clear_bit(RXRPC_CALL_EV_ACK, &call->events);
1254 if (call->events || !skb_queue_empty(&call->rx_queue)) {
1255 read_lock_bh(&call->state_lock);
1256 if (call->state < RXRPC_CALL_DEAD)
1257 rxrpc_queue_call(call);
1258 read_unlock_bh(&call->state_lock);
1261 /* don't leave aborted connections on the accept queue */
1262 if (call->state >= RXRPC_CALL_COMPLETE &&
1263 !list_empty(&call->accept_link)) {
1264 _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }",
1265 call, call->events, call->flags, call->conn->proto.cid);
1267 read_lock_bh(&call->state_lock);
1268 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
1269 !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events))
1270 rxrpc_queue_call(call);
1271 read_unlock_bh(&call->state_lock);
1277 /* because we don't want two CPUs both processing the work item for one
1278 * call at the same time, we use a flag to note when it's busy; however
1279 * this means there's a race between clearing the flag and setting the
1280 * work pending bit and the work item being processed again */
1281 if (call->events && !work_pending(&call->processor)) {
1282 _debug("jumpstart %x", call->conn->proto.cid);
1283 rxrpc_queue_call(call);
1290 _debug("out of memory");
1291 goto maybe_reschedule;