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 #include <linux/module.h>
13 #include <linux/circ_buf.h>
14 #include <linux/net.h>
15 #include <linux/skbuff.h>
16 #include <linux/udp.h>
18 #include <net/af_rxrpc.h>
19 #include "ar-internal.h"
21 static unsigned rxrpc_ack_defer
= 1;
23 static const char *rxrpc_acks
[] = {
24 "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
28 static const s8 rxrpc_ack_priority
[] = {
30 [RXRPC_ACK_DELAY
] = 1,
31 [RXRPC_ACK_REQUESTED
] = 2,
33 [RXRPC_ACK_PING_RESPONSE
] = 4,
34 [RXRPC_ACK_DUPLICATE
] = 5,
35 [RXRPC_ACK_OUT_OF_SEQUENCE
] = 6,
36 [RXRPC_ACK_EXCEEDS_WINDOW
] = 7,
37 [RXRPC_ACK_NOSPACE
] = 8,
41 * propose an ACK be sent
43 void __rxrpc_propose_ACK(struct rxrpc_call
*call
, uint8_t ack_reason
,
44 __be32 serial
, bool immediate
)
47 s8 prior
= rxrpc_ack_priority
[ack_reason
];
49 ASSERTCMP(prior
, >, 0);
51 _enter("{%d},%s,%%%x,%u",
52 call
->debug_id
, rxrpc_acks
[ack_reason
], ntohl(serial
),
55 if (prior
< rxrpc_ack_priority
[call
->ackr_reason
]) {
61 /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
63 if (prior
== rxrpc_ack_priority
[call
->ackr_reason
]) {
65 call
->ackr_serial
= serial
;
71 call
->ackr_reason
= ack_reason
;
72 call
->ackr_serial
= serial
;
76 _debug("run delay timer");
77 call
->ack_timer
.expires
= jiffies
+ rxrpc_ack_timeout
* HZ
;
78 add_timer(&call
->ack_timer
);
83 _debug("run defer timer");
89 case RXRPC_ACK_REQUESTED
:
92 if (!immediate
|| serial
== cpu_to_be32(1)) {
93 _debug("run defer timer");
94 expiry
= rxrpc_ack_defer
;
99 _debug("immediate ACK");
105 if (!timer_pending(&call
->ack_timer
) ||
106 time_after(call
->ack_timer
.expires
, expiry
))
107 mod_timer(&call
->ack_timer
, expiry
);
111 _debug("cancel timer %%%u", ntohl(serial
));
112 try_to_del_timer_sync(&call
->ack_timer
);
113 read_lock_bh(&call
->state_lock
);
114 if (call
->state
<= RXRPC_CALL_COMPLETE
&&
115 !test_and_set_bit(RXRPC_CALL_ACK
, &call
->events
))
116 rxrpc_queue_call(call
);
117 read_unlock_bh(&call
->state_lock
);
121 * propose an ACK be sent, locking the call structure
123 void rxrpc_propose_ACK(struct rxrpc_call
*call
, uint8_t ack_reason
,
124 __be32 serial
, bool immediate
)
126 s8 prior
= rxrpc_ack_priority
[ack_reason
];
128 if (prior
> rxrpc_ack_priority
[call
->ackr_reason
]) {
129 spin_lock_bh(&call
->lock
);
130 __rxrpc_propose_ACK(call
, ack_reason
, serial
, immediate
);
131 spin_unlock_bh(&call
->lock
);
136 * set the resend timer
138 static void rxrpc_set_resend(struct rxrpc_call
*call
, u8 resend
,
139 unsigned long resend_at
)
141 read_lock_bh(&call
->state_lock
);
142 if (call
->state
>= RXRPC_CALL_COMPLETE
)
146 _debug("SET RESEND");
147 set_bit(RXRPC_CALL_RESEND
, &call
->events
);
151 _debug("MODIFY RESEND TIMER");
152 set_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
153 mod_timer(&call
->resend_timer
, resend_at
);
155 _debug("KILL RESEND TIMER");
156 del_timer_sync(&call
->resend_timer
);
157 clear_bit(RXRPC_CALL_RESEND_TIMER
, &call
->events
);
158 clear_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
160 read_unlock_bh(&call
->state_lock
);
166 static void rxrpc_resend(struct rxrpc_call
*call
)
168 struct rxrpc_skb_priv
*sp
;
169 struct rxrpc_header
*hdr
;
171 unsigned long *p_txb
, resend_at
;
175 _enter("{%d,%d,%d,%d},",
176 call
->acks_hard
, call
->acks_unacked
,
177 atomic_read(&call
->sequence
),
178 CIRC_CNT(call
->acks_head
, call
->acks_tail
, call
->acks_winsz
));
184 for (loop
= call
->acks_tail
;
185 loop
!= call
->acks_head
|| stop
;
186 loop
= (loop
+ 1) & (call
->acks_winsz
- 1)
188 p_txb
= call
->acks_window
+ loop
;
189 smp_read_barrier_depends();
193 txb
= (struct sk_buff
*) *p_txb
;
196 if (sp
->need_resend
) {
199 /* each Tx packet has a new serial number */
201 htonl(atomic_inc_return(&call
->conn
->serial
));
203 hdr
= (struct rxrpc_header
*) txb
->head
;
204 hdr
->serial
= sp
->hdr
.serial
;
206 _proto("Tx DATA %%%u { #%d }",
207 ntohl(sp
->hdr
.serial
), ntohl(sp
->hdr
.seq
));
208 if (rxrpc_send_packet(call
->conn
->trans
, txb
) < 0) {
210 sp
->resend_at
= jiffies
+ 3;
213 jiffies
+ rxrpc_resend_timeout
* HZ
;
217 if (time_after_eq(jiffies
+ 1, sp
->resend_at
)) {
220 } else if (resend
& 2) {
221 if (time_before(sp
->resend_at
, resend_at
))
222 resend_at
= sp
->resend_at
;
224 resend_at
= sp
->resend_at
;
229 rxrpc_set_resend(call
, resend
, resend_at
);
234 * handle resend timer expiry
236 static void rxrpc_resend_timer(struct rxrpc_call
*call
)
238 struct rxrpc_skb_priv
*sp
;
240 unsigned long *p_txb
, resend_at
;
245 call
->acks_tail
, call
->acks_unacked
, call
->acks_head
);
250 for (loop
= call
->acks_unacked
;
251 loop
!= call
->acks_head
;
252 loop
= (loop
+ 1) & (call
->acks_winsz
- 1)
254 p_txb
= call
->acks_window
+ loop
;
255 smp_read_barrier_depends();
256 txb
= (struct sk_buff
*) (*p_txb
& ~1);
259 ASSERT(!(*p_txb
& 1));
261 if (sp
->need_resend
) {
263 } else if (time_after_eq(jiffies
+ 1, sp
->resend_at
)) {
266 } else if (resend
& 2) {
267 if (time_before(sp
->resend_at
, resend_at
))
268 resend_at
= sp
->resend_at
;
270 resend_at
= sp
->resend_at
;
275 rxrpc_set_resend(call
, resend
, resend_at
);
280 * process soft ACKs of our transmitted packets
281 * - these indicate packets the peer has or has not received, but hasn't yet
282 * given to the consumer, and so can still be discarded and re-requested
284 static int rxrpc_process_soft_ACKs(struct rxrpc_call
*call
,
285 struct rxrpc_ackpacket
*ack
,
288 struct rxrpc_skb_priv
*sp
;
290 unsigned long *p_txb
, resend_at
;
292 u8 sacks
[RXRPC_MAXACKS
], resend
;
294 _enter("{%d,%d},{%d},",
296 CIRC_CNT(call
->acks_head
, call
->acks_tail
, call
->acks_winsz
),
299 if (skb_copy_bits(skb
, 0, sacks
, ack
->nAcks
) < 0)
304 for (loop
= 0; loop
< ack
->nAcks
; loop
++) {
305 p_txb
= call
->acks_window
;
306 p_txb
+= (call
->acks_tail
+ loop
) & (call
->acks_winsz
- 1);
307 smp_read_barrier_depends();
308 txb
= (struct sk_buff
*) (*p_txb
& ~1);
311 switch (sacks
[loop
]) {
312 case RXRPC_ACK_TYPE_ACK
:
316 case RXRPC_ACK_TYPE_NACK
:
322 _debug("Unsupported ACK type %d", sacks
[loop
]);
328 call
->acks_unacked
= (call
->acks_tail
+ loop
) & (call
->acks_winsz
- 1);
330 /* anything not explicitly ACK'd is implicitly NACK'd, but may just not
331 * have been received or processed yet by the far end */
332 for (loop
= call
->acks_unacked
;
333 loop
!= call
->acks_head
;
334 loop
= (loop
+ 1) & (call
->acks_winsz
- 1)
336 p_txb
= call
->acks_window
+ loop
;
337 smp_read_barrier_depends();
338 txb
= (struct sk_buff
*) (*p_txb
& ~1);
342 /* packet must have been discarded */
346 } else if (sp
->need_resend
) {
348 } else if (time_after_eq(jiffies
+ 1, sp
->resend_at
)) {
351 } else if (resend
& 2) {
352 if (time_before(sp
->resend_at
, resend_at
))
353 resend_at
= sp
->resend_at
;
355 resend_at
= sp
->resend_at
;
360 rxrpc_set_resend(call
, resend
, resend_at
);
365 _leave(" = -EPROTO");
370 * discard hard-ACK'd packets from the Tx window
372 static void rxrpc_rotate_tx_window(struct rxrpc_call
*call
, u32 hard
)
374 struct rxrpc_skb_priv
*sp
;
376 int tail
= call
->acks_tail
, old_tail
;
377 int win
= CIRC_CNT(call
->acks_head
, tail
, call
->acks_winsz
);
379 _enter("{%u,%u},%u", call
->acks_hard
, win
, hard
);
381 ASSERTCMP(hard
- call
->acks_hard
, <=, win
);
383 while (call
->acks_hard
< hard
) {
384 smp_read_barrier_depends();
385 _skb
= call
->acks_window
[tail
] & ~1;
386 sp
= rxrpc_skb((struct sk_buff
*) _skb
);
387 rxrpc_free_skb((struct sk_buff
*) _skb
);
389 tail
= (tail
+ 1) & (call
->acks_winsz
- 1);
390 call
->acks_tail
= tail
;
391 if (call
->acks_unacked
== old_tail
)
392 call
->acks_unacked
= tail
;
396 wake_up(&call
->tx_waitq
);
400 * clear the Tx window in the event of a failure
402 static void rxrpc_clear_tx_window(struct rxrpc_call
*call
)
404 rxrpc_rotate_tx_window(call
, atomic_read(&call
->sequence
));
408 * drain the out of sequence received packet queue into the packet Rx queue
410 static int rxrpc_drain_rx_oos_queue(struct rxrpc_call
*call
)
412 struct rxrpc_skb_priv
*sp
;
417 _enter("{%d,%d}", call
->rx_data_post
, call
->rx_first_oos
);
419 spin_lock_bh(&call
->lock
);
422 if (test_bit(RXRPC_CALL_RELEASED
, &call
->flags
))
423 goto socket_unavailable
;
425 skb
= skb_dequeue(&call
->rx_oos_queue
);
429 _debug("drain OOS packet %d [%d]",
430 ntohl(sp
->hdr
.seq
), call
->rx_first_oos
);
432 if (ntohl(sp
->hdr
.seq
) != call
->rx_first_oos
) {
433 skb_queue_head(&call
->rx_oos_queue
, skb
);
434 call
->rx_first_oos
= ntohl(rxrpc_skb(skb
)->hdr
.seq
);
435 _debug("requeue %p {%u}", skb
, call
->rx_first_oos
);
437 skb
->mark
= RXRPC_SKB_MARK_DATA
;
438 terminal
= ((sp
->hdr
.flags
& RXRPC_LAST_PACKET
) &&
439 !(sp
->hdr
.flags
& RXRPC_CLIENT_INITIATED
));
440 ret
= rxrpc_queue_rcv_skb(call
, skb
, true, terminal
);
442 _debug("drain #%u", call
->rx_data_post
);
443 call
->rx_data_post
++;
445 /* find out what the next packet is */
446 skb
= skb_peek(&call
->rx_oos_queue
);
449 ntohl(rxrpc_skb(skb
)->hdr
.seq
);
451 call
->rx_first_oos
= 0;
452 _debug("peek %p {%u}", skb
, call
->rx_first_oos
);
458 spin_unlock_bh(&call
->lock
);
459 _leave(" = %d", ret
);
464 * insert an out of sequence packet into the buffer
466 static void rxrpc_insert_oos_packet(struct rxrpc_call
*call
,
469 struct rxrpc_skb_priv
*sp
, *psp
;
474 seq
= ntohl(sp
->hdr
.seq
);
475 _enter(",,{%u}", seq
);
477 skb
->destructor
= rxrpc_packet_destructor
;
478 ASSERTCMP(sp
->call
, ==, NULL
);
480 rxrpc_get_call(call
);
482 /* insert into the buffer in sequence order */
483 spin_lock_bh(&call
->lock
);
485 skb_queue_walk(&call
->rx_oos_queue
, p
) {
487 if (ntohl(psp
->hdr
.seq
) > seq
) {
488 _debug("insert oos #%u before #%u",
489 seq
, ntohl(psp
->hdr
.seq
));
490 skb_insert(p
, skb
, &call
->rx_oos_queue
);
495 _debug("append oos #%u", seq
);
496 skb_queue_tail(&call
->rx_oos_queue
, skb
);
499 /* we might now have a new front to the queue */
500 if (call
->rx_first_oos
== 0 || seq
< call
->rx_first_oos
)
501 call
->rx_first_oos
= seq
;
503 read_lock(&call
->state_lock
);
504 if (call
->state
< RXRPC_CALL_COMPLETE
&&
505 call
->rx_data_post
== call
->rx_first_oos
) {
506 _debug("drain rx oos now");
507 set_bit(RXRPC_CALL_DRAIN_RX_OOS
, &call
->events
);
509 read_unlock(&call
->state_lock
);
511 spin_unlock_bh(&call
->lock
);
512 _leave(" [stored #%u]", call
->rx_first_oos
);
516 * clear the Tx window on final ACK reception
518 static void rxrpc_zap_tx_window(struct rxrpc_call
*call
)
520 struct rxrpc_skb_priv
*sp
;
522 unsigned long _skb
, *acks_window
;
523 uint8_t winsz
= call
->acks_winsz
;
526 acks_window
= call
->acks_window
;
527 call
->acks_window
= NULL
;
529 while (CIRC_CNT(call
->acks_head
, call
->acks_tail
, winsz
) > 0) {
530 tail
= call
->acks_tail
;
531 smp_read_barrier_depends();
532 _skb
= acks_window
[tail
] & ~1;
534 call
->acks_tail
= (call
->acks_tail
+ 1) & (winsz
- 1);
536 skb
= (struct sk_buff
*) _skb
;
538 _debug("+++ clear Tx %u", ntohl(sp
->hdr
.seq
));
546 * process packets in the reception queue
548 static int rxrpc_process_rx_queue(struct rxrpc_call
*call
,
551 struct rxrpc_ackpacket ack
;
552 struct rxrpc_skb_priv
*sp
;
561 skb
= skb_dequeue(&call
->rx_queue
);
565 _net("deferred skb %p", skb
);
569 _debug("process %s [st %d]", rxrpc_pkts
[sp
->hdr
.type
], call
->state
);
573 switch (sp
->hdr
.type
) {
574 /* data packets that wind up here have been received out of
575 * order, need security processing or are jumbo packets */
576 case RXRPC_PACKET_TYPE_DATA
:
577 _proto("OOSQ DATA %%%u { #%u }",
578 ntohl(sp
->hdr
.serial
), ntohl(sp
->hdr
.seq
));
580 /* secured packets must be verified and possibly decrypted */
581 if (rxrpc_verify_packet(call
, skb
, _abort_code
) < 0)
584 rxrpc_insert_oos_packet(call
, skb
);
585 goto process_further
;
587 /* partial ACK to process */
588 case RXRPC_PACKET_TYPE_ACK
:
589 if (skb_copy_bits(skb
, 0, &ack
, sizeof(ack
)) < 0) {
590 _debug("extraction failure");
593 if (!skb_pull(skb
, sizeof(ack
)))
596 latest
= ntohl(sp
->hdr
.serial
);
597 hard
= ntohl(ack
.firstPacket
);
598 tx
= atomic_read(&call
->sequence
);
600 _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
604 ntohl(ack
.previousPacket
),
606 rxrpc_acks
[ack
.reason
],
609 if (ack
.reason
== RXRPC_ACK_PING
) {
610 _proto("Rx ACK %%%u PING Request", latest
);
611 rxrpc_propose_ACK(call
, RXRPC_ACK_PING_RESPONSE
,
612 sp
->hdr
.serial
, true);
615 /* discard any out-of-order or duplicate ACKs */
616 if (latest
- call
->acks_latest
<= 0) {
617 _debug("discard ACK %d <= %d",
618 latest
, call
->acks_latest
);
621 call
->acks_latest
= latest
;
623 if (call
->state
!= RXRPC_CALL_CLIENT_SEND_REQUEST
&&
624 call
->state
!= RXRPC_CALL_CLIENT_AWAIT_REPLY
&&
625 call
->state
!= RXRPC_CALL_SERVER_SEND_REPLY
&&
626 call
->state
!= RXRPC_CALL_SERVER_AWAIT_ACK
)
629 _debug("Tx=%d H=%u S=%d", tx
, call
->acks_hard
, call
->state
);
633 _debug("hard-ACK'd packet %d not transmitted"
639 if ((call
->state
== RXRPC_CALL_CLIENT_AWAIT_REPLY
||
640 call
->state
== RXRPC_CALL_SERVER_AWAIT_ACK
) &&
645 rxrpc_rotate_tx_window(call
, hard
- 1);
649 if (hard
- 1 + ack
.nAcks
> tx
) {
650 _debug("soft-ACK'd packet %d+%d not"
651 " transmitted (%d top)",
652 hard
- 1, ack
.nAcks
, tx
);
656 if (rxrpc_process_soft_ACKs(call
, &ack
, skb
) < 0)
661 /* complete ACK to process */
662 case RXRPC_PACKET_TYPE_ACKALL
:
665 /* abort and busy are handled elsewhere */
666 case RXRPC_PACKET_TYPE_BUSY
:
667 case RXRPC_PACKET_TYPE_ABORT
:
670 /* connection level events - also handled elsewhere */
671 case RXRPC_PACKET_TYPE_CHALLENGE
:
672 case RXRPC_PACKET_TYPE_RESPONSE
:
673 case RXRPC_PACKET_TYPE_DEBUG
:
677 /* if we've had a hard ACK that covers all the packets we've sent, then
678 * that ends that phase of the operation */
680 write_lock_bh(&call
->state_lock
);
681 _debug("ack all %d", call
->state
);
683 switch (call
->state
) {
684 case RXRPC_CALL_CLIENT_AWAIT_REPLY
:
685 call
->state
= RXRPC_CALL_CLIENT_RECV_REPLY
;
687 case RXRPC_CALL_SERVER_AWAIT_ACK
:
688 _debug("srv complete");
689 call
->state
= RXRPC_CALL_COMPLETE
;
692 case RXRPC_CALL_CLIENT_SEND_REQUEST
:
693 case RXRPC_CALL_SERVER_RECV_REQUEST
:
694 goto protocol_error_unlock
; /* can't occur yet */
696 write_unlock_bh(&call
->state_lock
);
697 goto discard
; /* assume packet left over from earlier phase */
700 write_unlock_bh(&call
->state_lock
);
702 /* if all the packets we sent are hard-ACK'd, then we can discard
703 * whatever we've got left */
704 _debug("clear Tx %d",
705 CIRC_CNT(call
->acks_head
, call
->acks_tail
, call
->acks_winsz
));
707 del_timer_sync(&call
->resend_timer
);
708 clear_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
709 clear_bit(RXRPC_CALL_RESEND_TIMER
, &call
->events
);
711 if (call
->acks_window
)
712 rxrpc_zap_tx_window(call
);
715 /* post the final ACK message for userspace to pick up */
717 skb
->mark
= RXRPC_SKB_MARK_FINAL_ACK
;
719 rxrpc_get_call(call
);
720 spin_lock_bh(&call
->lock
);
721 if (rxrpc_queue_rcv_skb(call
, skb
, true, true) < 0)
723 spin_unlock_bh(&call
->lock
);
724 goto process_further
;
729 goto process_further
;
731 protocol_error_unlock
:
732 write_unlock_bh(&call
->state_lock
);
735 _leave(" = -EPROTO");
740 * post a message to the socket Rx queue for recvmsg() to pick up
742 static int rxrpc_post_message(struct rxrpc_call
*call
, u32 mark
, u32 error
,
745 struct rxrpc_skb_priv
*sp
;
749 _enter("{%d,%lx},%u,%u,%d",
750 call
->debug_id
, call
->flags
, mark
, error
, fatal
);
752 /* remove timers and things for fatal messages */
754 del_timer_sync(&call
->resend_timer
);
755 del_timer_sync(&call
->ack_timer
);
756 clear_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
759 if (mark
!= RXRPC_SKB_MARK_NEW_CALL
&&
760 !test_bit(RXRPC_CALL_HAS_USERID
, &call
->flags
)) {
761 _leave("[no userid]");
765 if (!test_bit(RXRPC_CALL_TERMINAL_MSG
, &call
->flags
)) {
766 skb
= alloc_skb(0, GFP_NOFS
);
775 memset(sp
, 0, sizeof(*sp
));
778 rxrpc_get_call(call
);
780 spin_lock_bh(&call
->lock
);
781 ret
= rxrpc_queue_rcv_skb(call
, skb
, true, fatal
);
782 spin_unlock_bh(&call
->lock
);
791 * handle background processing of incoming call packets and ACK / abort
794 void rxrpc_process_call(struct work_struct
*work
)
796 struct rxrpc_call
*call
=
797 container_of(work
, struct rxrpc_call
, processor
);
798 struct rxrpc_ackpacket ack
;
799 struct rxrpc_ackinfo ackinfo
;
800 struct rxrpc_header hdr
;
806 int genbit
, loop
, nbit
, ioc
, ret
;
807 u32 abort_code
= RX_PROTOCOL_ERROR
;
810 //printk("\n--------------------\n");
811 _enter("{%d,%s,%lx} [%lu]",
812 call
->debug_id
, rxrpc_call_states
[call
->state
], call
->events
,
813 (jiffies
- call
->creation_jif
) / (HZ
/ 10));
815 if (test_and_set_bit(RXRPC_CALL_PROC_BUSY
, &call
->flags
)) {
816 _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX");
820 /* there's a good chance we're going to have to send a message, so set
821 * one up in advance */
822 msg
.msg_name
= &call
->conn
->trans
->peer
->srx
.transport
.sin
;
823 msg
.msg_namelen
= sizeof(call
->conn
->trans
->peer
->srx
.transport
.sin
);
824 msg
.msg_control
= NULL
;
825 msg
.msg_controllen
= 0;
828 hdr
.epoch
= call
->conn
->epoch
;
830 hdr
.callNumber
= call
->call_id
;
832 hdr
.type
= RXRPC_PACKET_TYPE_ACK
;
833 hdr
.flags
= call
->conn
->out_clientflag
;
835 hdr
.securityIndex
= call
->conn
->security_ix
;
837 hdr
.serviceId
= call
->conn
->service_id
;
839 memset(iov
, 0, sizeof(iov
));
840 iov
[0].iov_base
= &hdr
;
841 iov
[0].iov_len
= sizeof(hdr
);
843 /* deal with events of a final nature */
844 if (test_bit(RXRPC_CALL_RELEASE
, &call
->events
)) {
845 rxrpc_release_call(call
);
846 clear_bit(RXRPC_CALL_RELEASE
, &call
->events
);
849 if (test_bit(RXRPC_CALL_RCVD_ERROR
, &call
->events
)) {
852 clear_bit(RXRPC_CALL_CONN_ABORT
, &call
->events
);
853 clear_bit(RXRPC_CALL_REJECT_BUSY
, &call
->events
);
854 clear_bit(RXRPC_CALL_ABORT
, &call
->events
);
856 error
= call
->conn
->trans
->peer
->net_error
;
857 _debug("post net error %d", error
);
859 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_NET_ERROR
,
862 clear_bit(RXRPC_CALL_RCVD_ERROR
, &call
->events
);
866 if (test_bit(RXRPC_CALL_CONN_ABORT
, &call
->events
)) {
867 ASSERTCMP(call
->state
, >, RXRPC_CALL_COMPLETE
);
869 clear_bit(RXRPC_CALL_REJECT_BUSY
, &call
->events
);
870 clear_bit(RXRPC_CALL_ABORT
, &call
->events
);
872 _debug("post conn abort");
874 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_LOCAL_ERROR
,
875 call
->conn
->error
, true) < 0)
877 clear_bit(RXRPC_CALL_CONN_ABORT
, &call
->events
);
881 if (test_bit(RXRPC_CALL_REJECT_BUSY
, &call
->events
)) {
882 hdr
.type
= RXRPC_PACKET_TYPE_BUSY
;
883 genbit
= RXRPC_CALL_REJECT_BUSY
;
887 if (test_bit(RXRPC_CALL_ABORT
, &call
->events
)) {
888 ASSERTCMP(call
->state
, >, RXRPC_CALL_COMPLETE
);
890 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_LOCAL_ERROR
,
891 ECONNABORTED
, true) < 0)
893 hdr
.type
= RXRPC_PACKET_TYPE_ABORT
;
894 data
= htonl(call
->abort_code
);
895 iov
[1].iov_base
= &data
;
896 iov
[1].iov_len
= sizeof(data
);
897 genbit
= RXRPC_CALL_ABORT
;
901 if (test_bit(RXRPC_CALL_ACK_FINAL
, &call
->events
)) {
902 hdr
.type
= RXRPC_PACKET_TYPE_ACKALL
;
903 genbit
= RXRPC_CALL_ACK_FINAL
;
907 if (call
->events
& ((1 << RXRPC_CALL_RCVD_BUSY
) |
908 (1 << RXRPC_CALL_RCVD_ABORT
))
912 if (test_bit(RXRPC_CALL_RCVD_ABORT
, &call
->events
))
913 mark
= RXRPC_SKB_MARK_REMOTE_ABORT
;
915 mark
= RXRPC_SKB_MARK_BUSY
;
917 _debug("post abort/busy");
918 rxrpc_clear_tx_window(call
);
919 if (rxrpc_post_message(call
, mark
, ECONNABORTED
, true) < 0)
922 clear_bit(RXRPC_CALL_RCVD_BUSY
, &call
->events
);
923 clear_bit(RXRPC_CALL_RCVD_ABORT
, &call
->events
);
927 if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL
, &call
->events
)) {
928 _debug("do implicit ackall");
929 rxrpc_clear_tx_window(call
);
932 if (test_bit(RXRPC_CALL_LIFE_TIMER
, &call
->events
)) {
933 write_lock_bh(&call
->state_lock
);
934 if (call
->state
<= RXRPC_CALL_COMPLETE
) {
935 call
->state
= RXRPC_CALL_LOCALLY_ABORTED
;
936 call
->abort_code
= RX_CALL_TIMEOUT
;
937 set_bit(RXRPC_CALL_ABORT
, &call
->events
);
939 write_unlock_bh(&call
->state_lock
);
941 _debug("post timeout");
942 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_LOCAL_ERROR
,
946 clear_bit(RXRPC_CALL_LIFE_TIMER
, &call
->events
);
950 /* deal with assorted inbound messages */
951 if (!skb_queue_empty(&call
->rx_queue
)) {
952 switch (rxrpc_process_rx_queue(call
, &abort_code
)) {
961 rxrpc_abort_call(call
, abort_code
);
966 /* handle resending */
967 if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER
, &call
->events
))
968 rxrpc_resend_timer(call
);
969 if (test_and_clear_bit(RXRPC_CALL_RESEND
, &call
->events
))
972 /* consider sending an ordinary ACK */
973 if (test_bit(RXRPC_CALL_ACK
, &call
->events
)) {
976 _debug("send ACK: window: %d - %d { %lx }",
977 call
->rx_data_eaten
, call
->ackr_win_top
,
978 call
->ackr_window
[0]);
980 if (call
->state
> RXRPC_CALL_SERVER_ACK_REQUEST
&&
981 call
->ackr_reason
!= RXRPC_ACK_PING_RESPONSE
) {
982 /* ACK by sending reply DATA packet in this state */
983 clear_bit(RXRPC_CALL_ACK
, &call
->events
);
984 goto maybe_reschedule
;
987 genbit
= RXRPC_CALL_ACK
;
989 acks
= kzalloc(call
->ackr_win_top
- call
->rx_data_eaten
,
994 //hdr.flags = RXRPC_SLOW_START_OK;
995 ack
.bufferSpace
= htons(8);
1000 ackinfo
.rxMTU
= htonl(5692);
1001 // ackinfo.rxMTU = htonl(call->conn->trans->peer->maxdata);
1002 ackinfo
.maxMTU
= htonl(call
->conn
->trans
->peer
->maxdata
);
1003 ackinfo
.rwind
= htonl(32);
1004 ackinfo
.jumbo_max
= htonl(4);
1006 spin_lock_bh(&call
->lock
);
1007 ack
.reason
= call
->ackr_reason
;
1008 ack
.serial
= call
->ackr_serial
;
1009 ack
.previousPacket
= call
->ackr_prev_seq
;
1010 ack
.firstPacket
= htonl(call
->rx_data_eaten
+ 1);
1013 for (loop
= 0; loop
< RXRPC_ACKR_WINDOW_ASZ
; loop
++) {
1014 nbit
= loop
* BITS_PER_LONG
;
1015 for (bits
= call
->ackr_window
[loop
]; bits
; bits
>>= 1
1017 _debug("- l=%d n=%d b=%lx", loop
, nbit
, bits
);
1019 acks
[nbit
] = RXRPC_ACK_TYPE_ACK
;
1020 ack
.nAcks
= nbit
+ 1;
1025 call
->ackr_reason
= 0;
1026 spin_unlock_bh(&call
->lock
);
1030 iov
[1].iov_base
= &ack
;
1031 iov
[1].iov_len
= sizeof(ack
);
1032 iov
[2].iov_base
= acks
;
1033 iov
[2].iov_len
= ack
.nAcks
;
1034 iov
[3].iov_base
= &pad
;
1036 iov
[4].iov_base
= &ackinfo
;
1037 iov
[4].iov_len
= sizeof(ackinfo
);
1039 switch (ack
.reason
) {
1040 case RXRPC_ACK_REQUESTED
:
1041 case RXRPC_ACK_DUPLICATE
:
1042 case RXRPC_ACK_OUT_OF_SEQUENCE
:
1043 case RXRPC_ACK_EXCEEDS_WINDOW
:
1044 case RXRPC_ACK_NOSPACE
:
1045 case RXRPC_ACK_PING
:
1046 case RXRPC_ACK_PING_RESPONSE
:
1047 goto send_ACK_with_skew
;
1048 case RXRPC_ACK_DELAY
:
1049 case RXRPC_ACK_IDLE
:
1054 /* handle completion of security negotiations on an incoming
1056 if (test_and_clear_bit(RXRPC_CALL_SECURED
, &call
->events
)) {
1058 spin_lock_bh(&call
->lock
);
1060 if (call
->state
== RXRPC_CALL_SERVER_SECURING
) {
1062 write_lock(&call
->conn
->lock
);
1063 if (!test_bit(RXRPC_CALL_RELEASED
, &call
->flags
) &&
1064 !test_bit(RXRPC_CALL_RELEASE
, &call
->events
)) {
1065 _debug("not released");
1066 call
->state
= RXRPC_CALL_SERVER_ACCEPTING
;
1067 list_move_tail(&call
->accept_link
,
1068 &call
->socket
->acceptq
);
1070 write_unlock(&call
->conn
->lock
);
1071 read_lock(&call
->state_lock
);
1072 if (call
->state
< RXRPC_CALL_COMPLETE
)
1073 set_bit(RXRPC_CALL_POST_ACCEPT
, &call
->events
);
1074 read_unlock(&call
->state_lock
);
1077 spin_unlock_bh(&call
->lock
);
1078 if (!test_bit(RXRPC_CALL_POST_ACCEPT
, &call
->events
))
1079 goto maybe_reschedule
;
1082 /* post a notification of an acceptable connection to the app */
1083 if (test_bit(RXRPC_CALL_POST_ACCEPT
, &call
->events
)) {
1084 _debug("post accept");
1085 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_NEW_CALL
,
1088 clear_bit(RXRPC_CALL_POST_ACCEPT
, &call
->events
);
1089 goto maybe_reschedule
;
1092 /* handle incoming call acceptance */
1093 if (test_and_clear_bit(RXRPC_CALL_ACCEPTED
, &call
->events
)) {
1095 ASSERTCMP(call
->rx_data_post
, ==, 0);
1096 call
->rx_data_post
= 1;
1097 read_lock_bh(&call
->state_lock
);
1098 if (call
->state
< RXRPC_CALL_COMPLETE
)
1099 set_bit(RXRPC_CALL_DRAIN_RX_OOS
, &call
->events
);
1100 read_unlock_bh(&call
->state_lock
);
1103 /* drain the out of sequence received packet queue into the packet Rx
1105 if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS
, &call
->events
)) {
1106 while (call
->rx_data_post
== call
->rx_first_oos
)
1107 if (rxrpc_drain_rx_oos_queue(call
) < 0)
1109 goto maybe_reschedule
;
1112 /* other events may have been raised since we started checking */
1113 goto maybe_reschedule
;
1116 ack
.maxSkew
= htons(atomic_read(&call
->conn
->hi_serial
) -
1119 hdr
.serial
= htonl(atomic_inc_return(&call
->conn
->serial
));
1120 _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
1123 ntohl(ack
.firstPacket
),
1124 ntohl(ack
.previousPacket
),
1126 rxrpc_acks
[ack
.reason
],
1129 del_timer_sync(&call
->ack_timer
);
1131 set_bit(RXRPC_CALL_TX_SOFT_ACK
, &call
->flags
);
1132 goto send_message_2
;
1135 _debug("send message");
1137 hdr
.serial
= htonl(atomic_inc_return(&call
->conn
->serial
));
1138 _proto("Tx %s %%%u", rxrpc_pkts
[hdr
.type
], ntohl(hdr
.serial
));
1141 len
= iov
[0].iov_len
;
1143 if (iov
[4].iov_len
) {
1145 len
+= iov
[4].iov_len
;
1146 len
+= iov
[3].iov_len
;
1147 len
+= iov
[2].iov_len
;
1148 len
+= iov
[1].iov_len
;
1149 } else if (iov
[3].iov_len
) {
1151 len
+= iov
[3].iov_len
;
1152 len
+= iov
[2].iov_len
;
1153 len
+= iov
[1].iov_len
;
1154 } else if (iov
[2].iov_len
) {
1156 len
+= iov
[2].iov_len
;
1157 len
+= iov
[1].iov_len
;
1158 } else if (iov
[1].iov_len
) {
1160 len
+= iov
[1].iov_len
;
1163 ret
= kernel_sendmsg(call
->conn
->trans
->local
->socket
,
1164 &msg
, iov
, ioc
, len
);
1166 _debug("sendmsg failed: %d", ret
);
1167 read_lock_bh(&call
->state_lock
);
1168 if (call
->state
< RXRPC_CALL_DEAD
)
1169 rxrpc_queue_call(call
);
1170 read_unlock_bh(&call
->state_lock
);
1175 case RXRPC_CALL_ABORT
:
1176 clear_bit(genbit
, &call
->events
);
1177 clear_bit(RXRPC_CALL_RCVD_ABORT
, &call
->events
);
1180 case RXRPC_CALL_ACK_FINAL
:
1181 write_lock_bh(&call
->state_lock
);
1182 if (call
->state
== RXRPC_CALL_CLIENT_FINAL_ACK
)
1183 call
->state
= RXRPC_CALL_COMPLETE
;
1184 write_unlock_bh(&call
->state_lock
);
1188 clear_bit(genbit
, &call
->events
);
1189 switch (call
->state
) {
1190 case RXRPC_CALL_CLIENT_AWAIT_REPLY
:
1191 case RXRPC_CALL_CLIENT_RECV_REPLY
:
1192 case RXRPC_CALL_SERVER_RECV_REQUEST
:
1193 case RXRPC_CALL_SERVER_ACK_REQUEST
:
1194 _debug("start ACK timer");
1195 rxrpc_propose_ACK(call
, RXRPC_ACK_DELAY
,
1196 call
->ackr_serial
, false);
1200 goto maybe_reschedule
;
1204 del_timer_sync(&call
->ack_timer
);
1205 if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL
, &call
->events
))
1206 rxrpc_put_call(call
);
1207 clear_bit(RXRPC_CALL_ACK
, &call
->events
);
1210 if (call
->events
|| !skb_queue_empty(&call
->rx_queue
)) {
1211 read_lock_bh(&call
->state_lock
);
1212 if (call
->state
< RXRPC_CALL_DEAD
)
1213 rxrpc_queue_call(call
);
1214 read_unlock_bh(&call
->state_lock
);
1217 /* don't leave aborted connections on the accept queue */
1218 if (call
->state
>= RXRPC_CALL_COMPLETE
&&
1219 !list_empty(&call
->accept_link
)) {
1220 _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }",
1221 call
, call
->events
, call
->flags
,
1222 ntohl(call
->conn
->cid
));
1224 read_lock_bh(&call
->state_lock
);
1225 if (!test_bit(RXRPC_CALL_RELEASED
, &call
->flags
) &&
1226 !test_and_set_bit(RXRPC_CALL_RELEASE
, &call
->events
))
1227 rxrpc_queue_call(call
);
1228 read_unlock_bh(&call
->state_lock
);
1232 clear_bit(RXRPC_CALL_PROC_BUSY
, &call
->flags
);
1235 /* because we don't want two CPUs both processing the work item for one
1236 * call at the same time, we use a flag to note when it's busy; however
1237 * this means there's a race between clearing the flag and setting the
1238 * work pending bit and the work item being processed again */
1239 if (call
->events
&& !work_pending(&call
->processor
)) {
1240 _debug("jumpstart %x", ntohl(call
->conn
->cid
));
1241 rxrpc_queue_call(call
);
1248 _debug("out of memory");
1249 goto maybe_reschedule
;