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![Jan Engelhardt](/assets/img/avatar_default.png)
String literals are constant, and usually, we can also tag the array of pointers const too, moving it to the .rodata section. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
1305 lines
32 KiB
C
1305 lines
32 KiB
C
/* Management of Tx window, Tx resend, ACKs and out-of-sequence reception
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/circ_buf.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/udp.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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static unsigned rxrpc_ack_defer = 1;
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static const char *const rxrpc_acks[] = {
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"---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
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"-?-"
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};
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static const s8 rxrpc_ack_priority[] = {
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[0] = 0,
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[RXRPC_ACK_DELAY] = 1,
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[RXRPC_ACK_REQUESTED] = 2,
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[RXRPC_ACK_IDLE] = 3,
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[RXRPC_ACK_PING_RESPONSE] = 4,
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[RXRPC_ACK_DUPLICATE] = 5,
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[RXRPC_ACK_OUT_OF_SEQUENCE] = 6,
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[RXRPC_ACK_EXCEEDS_WINDOW] = 7,
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[RXRPC_ACK_NOSPACE] = 8,
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};
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/*
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* propose an ACK be sent
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*/
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void __rxrpc_propose_ACK(struct rxrpc_call *call, uint8_t ack_reason,
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__be32 serial, bool immediate)
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{
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unsigned long expiry;
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s8 prior = rxrpc_ack_priority[ack_reason];
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ASSERTCMP(prior, >, 0);
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_enter("{%d},%s,%%%x,%u",
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call->debug_id, rxrpc_acks[ack_reason], ntohl(serial),
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immediate);
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if (prior < rxrpc_ack_priority[call->ackr_reason]) {
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if (immediate)
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goto cancel_timer;
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return;
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}
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/* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
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* numbers */
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if (prior == rxrpc_ack_priority[call->ackr_reason]) {
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if (prior <= 4)
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call->ackr_serial = serial;
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if (immediate)
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goto cancel_timer;
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return;
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}
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call->ackr_reason = ack_reason;
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call->ackr_serial = serial;
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switch (ack_reason) {
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case RXRPC_ACK_DELAY:
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_debug("run delay timer");
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call->ack_timer.expires = jiffies + rxrpc_ack_timeout * HZ;
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add_timer(&call->ack_timer);
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return;
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case RXRPC_ACK_IDLE:
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if (!immediate) {
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_debug("run defer timer");
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expiry = 1;
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goto run_timer;
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}
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goto cancel_timer;
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case RXRPC_ACK_REQUESTED:
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if (!rxrpc_ack_defer)
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goto cancel_timer;
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if (!immediate || serial == cpu_to_be32(1)) {
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_debug("run defer timer");
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expiry = rxrpc_ack_defer;
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goto run_timer;
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}
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default:
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_debug("immediate ACK");
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goto cancel_timer;
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}
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run_timer:
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expiry += jiffies;
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if (!timer_pending(&call->ack_timer) ||
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time_after(call->ack_timer.expires, expiry))
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mod_timer(&call->ack_timer, expiry);
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return;
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cancel_timer:
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_debug("cancel timer %%%u", ntohl(serial));
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try_to_del_timer_sync(&call->ack_timer);
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read_lock_bh(&call->state_lock);
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if (call->state <= RXRPC_CALL_COMPLETE &&
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!test_and_set_bit(RXRPC_CALL_ACK, &call->events))
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rxrpc_queue_call(call);
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read_unlock_bh(&call->state_lock);
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}
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/*
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* propose an ACK be sent, locking the call structure
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*/
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void rxrpc_propose_ACK(struct rxrpc_call *call, uint8_t ack_reason,
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__be32 serial, bool immediate)
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{
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s8 prior = rxrpc_ack_priority[ack_reason];
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if (prior > rxrpc_ack_priority[call->ackr_reason]) {
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spin_lock_bh(&call->lock);
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__rxrpc_propose_ACK(call, ack_reason, serial, immediate);
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spin_unlock_bh(&call->lock);
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}
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}
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/*
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* set the resend timer
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*/
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static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend,
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unsigned long resend_at)
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{
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read_lock_bh(&call->state_lock);
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if (call->state >= RXRPC_CALL_COMPLETE)
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resend = 0;
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if (resend & 1) {
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_debug("SET RESEND");
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set_bit(RXRPC_CALL_RESEND, &call->events);
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}
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if (resend & 2) {
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_debug("MODIFY RESEND TIMER");
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set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
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mod_timer(&call->resend_timer, resend_at);
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} else {
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_debug("KILL RESEND TIMER");
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del_timer_sync(&call->resend_timer);
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clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
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clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
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}
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read_unlock_bh(&call->state_lock);
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}
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/*
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* resend packets
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*/
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static void rxrpc_resend(struct rxrpc_call *call)
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{
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struct rxrpc_skb_priv *sp;
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struct rxrpc_header *hdr;
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struct sk_buff *txb;
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unsigned long *p_txb, resend_at;
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int loop, stop;
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u8 resend;
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_enter("{%d,%d,%d,%d},",
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call->acks_hard, call->acks_unacked,
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atomic_read(&call->sequence),
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CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
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stop = 0;
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resend = 0;
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resend_at = 0;
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for (loop = call->acks_tail;
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loop != call->acks_head || stop;
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loop = (loop + 1) & (call->acks_winsz - 1)
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) {
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p_txb = call->acks_window + loop;
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smp_read_barrier_depends();
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if (*p_txb & 1)
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continue;
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txb = (struct sk_buff *) *p_txb;
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sp = rxrpc_skb(txb);
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if (sp->need_resend) {
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sp->need_resend = 0;
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/* each Tx packet has a new serial number */
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sp->hdr.serial =
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htonl(atomic_inc_return(&call->conn->serial));
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hdr = (struct rxrpc_header *) txb->head;
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hdr->serial = sp->hdr.serial;
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_proto("Tx DATA %%%u { #%d }",
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ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
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if (rxrpc_send_packet(call->conn->trans, txb) < 0) {
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stop = 0;
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sp->resend_at = jiffies + 3;
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} else {
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sp->resend_at =
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jiffies + rxrpc_resend_timeout * HZ;
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}
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}
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if (time_after_eq(jiffies + 1, sp->resend_at)) {
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sp->need_resend = 1;
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resend |= 1;
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} else if (resend & 2) {
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if (time_before(sp->resend_at, resend_at))
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resend_at = sp->resend_at;
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} else {
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resend_at = sp->resend_at;
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resend |= 2;
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}
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}
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rxrpc_set_resend(call, resend, resend_at);
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_leave("");
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}
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/*
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* handle resend timer expiry
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*/
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static void rxrpc_resend_timer(struct rxrpc_call *call)
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{
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struct rxrpc_skb_priv *sp;
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struct sk_buff *txb;
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unsigned long *p_txb, resend_at;
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int loop;
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u8 resend;
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_enter("%d,%d,%d",
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call->acks_tail, call->acks_unacked, call->acks_head);
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resend = 0;
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resend_at = 0;
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for (loop = call->acks_unacked;
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loop != call->acks_head;
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loop = (loop + 1) & (call->acks_winsz - 1)
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) {
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p_txb = call->acks_window + loop;
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smp_read_barrier_depends();
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txb = (struct sk_buff *) (*p_txb & ~1);
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sp = rxrpc_skb(txb);
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ASSERT(!(*p_txb & 1));
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if (sp->need_resend) {
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;
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} else if (time_after_eq(jiffies + 1, sp->resend_at)) {
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sp->need_resend = 1;
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resend |= 1;
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} else if (resend & 2) {
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if (time_before(sp->resend_at, resend_at))
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resend_at = sp->resend_at;
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} else {
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resend_at = sp->resend_at;
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resend |= 2;
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}
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}
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rxrpc_set_resend(call, resend, resend_at);
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_leave("");
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}
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/*
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* process soft ACKs of our transmitted packets
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* - these indicate packets the peer has or has not received, but hasn't yet
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* given to the consumer, and so can still be discarded and re-requested
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*/
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static int rxrpc_process_soft_ACKs(struct rxrpc_call *call,
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struct rxrpc_ackpacket *ack,
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struct sk_buff *skb)
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{
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struct rxrpc_skb_priv *sp;
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struct sk_buff *txb;
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unsigned long *p_txb, resend_at;
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int loop;
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u8 sacks[RXRPC_MAXACKS], resend;
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_enter("{%d,%d},{%d},",
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call->acks_hard,
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CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz),
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ack->nAcks);
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if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0)
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goto protocol_error;
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resend = 0;
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resend_at = 0;
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for (loop = 0; loop < ack->nAcks; loop++) {
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p_txb = call->acks_window;
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p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1);
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smp_read_barrier_depends();
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txb = (struct sk_buff *) (*p_txb & ~1);
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sp = rxrpc_skb(txb);
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switch (sacks[loop]) {
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case RXRPC_ACK_TYPE_ACK:
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sp->need_resend = 0;
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*p_txb |= 1;
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break;
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case RXRPC_ACK_TYPE_NACK:
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sp->need_resend = 1;
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*p_txb &= ~1;
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resend = 1;
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break;
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default:
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_debug("Unsupported ACK type %d", sacks[loop]);
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goto protocol_error;
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}
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}
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smp_mb();
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call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1);
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/* anything not explicitly ACK'd is implicitly NACK'd, but may just not
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* have been received or processed yet by the far end */
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for (loop = call->acks_unacked;
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loop != call->acks_head;
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loop = (loop + 1) & (call->acks_winsz - 1)
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) {
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p_txb = call->acks_window + loop;
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smp_read_barrier_depends();
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txb = (struct sk_buff *) (*p_txb & ~1);
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sp = rxrpc_skb(txb);
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if (*p_txb & 1) {
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/* packet must have been discarded */
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sp->need_resend = 1;
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*p_txb &= ~1;
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resend |= 1;
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} else if (sp->need_resend) {
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;
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} else if (time_after_eq(jiffies + 1, sp->resend_at)) {
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sp->need_resend = 1;
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resend |= 1;
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} else if (resend & 2) {
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if (time_before(sp->resend_at, resend_at))
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resend_at = sp->resend_at;
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} else {
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resend_at = sp->resend_at;
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resend |= 2;
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}
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}
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rxrpc_set_resend(call, resend, resend_at);
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_leave(" = 0");
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return 0;
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protocol_error:
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_leave(" = -EPROTO");
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return -EPROTO;
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}
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/*
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* discard hard-ACK'd packets from the Tx window
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*/
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static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard)
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{
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struct rxrpc_skb_priv *sp;
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unsigned long _skb;
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int tail = call->acks_tail, old_tail;
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int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz);
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_enter("{%u,%u},%u", call->acks_hard, win, hard);
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ASSERTCMP(hard - call->acks_hard, <=, win);
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while (call->acks_hard < hard) {
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smp_read_barrier_depends();
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_skb = call->acks_window[tail] & ~1;
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sp = rxrpc_skb((struct sk_buff *) _skb);
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rxrpc_free_skb((struct sk_buff *) _skb);
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old_tail = tail;
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tail = (tail + 1) & (call->acks_winsz - 1);
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call->acks_tail = tail;
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if (call->acks_unacked == old_tail)
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call->acks_unacked = tail;
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call->acks_hard++;
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}
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wake_up(&call->tx_waitq);
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}
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|
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/*
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* clear the Tx window in the event of a failure
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*/
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static void rxrpc_clear_tx_window(struct rxrpc_call *call)
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{
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rxrpc_rotate_tx_window(call, atomic_read(&call->sequence));
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}
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|
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/*
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* drain the out of sequence received packet queue into the packet Rx queue
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*/
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static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call)
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{
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struct rxrpc_skb_priv *sp;
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struct sk_buff *skb;
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bool terminal;
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int ret;
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_enter("{%d,%d}", call->rx_data_post, call->rx_first_oos);
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|
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spin_lock_bh(&call->lock);
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|
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ret = -ECONNRESET;
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if (test_bit(RXRPC_CALL_RELEASED, &call->flags))
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goto socket_unavailable;
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|
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skb = skb_dequeue(&call->rx_oos_queue);
|
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if (skb) {
|
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sp = rxrpc_skb(skb);
|
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|
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_debug("drain OOS packet %d [%d]",
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ntohl(sp->hdr.seq), call->rx_first_oos);
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|
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if (ntohl(sp->hdr.seq) != call->rx_first_oos) {
|
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skb_queue_head(&call->rx_oos_queue, skb);
|
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call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq);
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_debug("requeue %p {%u}", skb, call->rx_first_oos);
|
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} else {
|
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skb->mark = RXRPC_SKB_MARK_DATA;
|
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terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
|
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!(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
|
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ret = rxrpc_queue_rcv_skb(call, skb, true, terminal);
|
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BUG_ON(ret < 0);
|
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_debug("drain #%u", call->rx_data_post);
|
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call->rx_data_post++;
|
|
|
|
/* find out what the next packet is */
|
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skb = skb_peek(&call->rx_oos_queue);
|
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if (skb)
|
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call->rx_first_oos =
|
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ntohl(rxrpc_skb(skb)->hdr.seq);
|
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else
|
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call->rx_first_oos = 0;
|
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_debug("peek %p {%u}", skb, call->rx_first_oos);
|
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}
|
|
}
|
|
|
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ret = 0;
|
|
socket_unavailable:
|
|
spin_unlock_bh(&call->lock);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* insert an out of sequence packet into the buffer
|
|
*/
|
|
static void rxrpc_insert_oos_packet(struct rxrpc_call *call,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct rxrpc_skb_priv *sp, *psp;
|
|
struct sk_buff *p;
|
|
u32 seq;
|
|
|
|
sp = rxrpc_skb(skb);
|
|
seq = ntohl(sp->hdr.seq);
|
|
_enter(",,{%u}", seq);
|
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|
|
skb->destructor = rxrpc_packet_destructor;
|
|
ASSERTCMP(sp->call, ==, NULL);
|
|
sp->call = call;
|
|
rxrpc_get_call(call);
|
|
|
|
/* insert into the buffer in sequence order */
|
|
spin_lock_bh(&call->lock);
|
|
|
|
skb_queue_walk(&call->rx_oos_queue, p) {
|
|
psp = rxrpc_skb(p);
|
|
if (ntohl(psp->hdr.seq) > seq) {
|
|
_debug("insert oos #%u before #%u",
|
|
seq, ntohl(psp->hdr.seq));
|
|
skb_insert(p, skb, &call->rx_oos_queue);
|
|
goto inserted;
|
|
}
|
|
}
|
|
|
|
_debug("append oos #%u", seq);
|
|
skb_queue_tail(&call->rx_oos_queue, skb);
|
|
inserted:
|
|
|
|
/* we might now have a new front to the queue */
|
|
if (call->rx_first_oos == 0 || seq < call->rx_first_oos)
|
|
call->rx_first_oos = seq;
|
|
|
|
read_lock(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_COMPLETE &&
|
|
call->rx_data_post == call->rx_first_oos) {
|
|
_debug("drain rx oos now");
|
|
set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events);
|
|
}
|
|
read_unlock(&call->state_lock);
|
|
|
|
spin_unlock_bh(&call->lock);
|
|
_leave(" [stored #%u]", call->rx_first_oos);
|
|
}
|
|
|
|
/*
|
|
* clear the Tx window on final ACK reception
|
|
*/
|
|
static void rxrpc_zap_tx_window(struct rxrpc_call *call)
|
|
{
|
|
struct rxrpc_skb_priv *sp;
|
|
struct sk_buff *skb;
|
|
unsigned long _skb, *acks_window;
|
|
uint8_t winsz = call->acks_winsz;
|
|
int tail;
|
|
|
|
acks_window = call->acks_window;
|
|
call->acks_window = NULL;
|
|
|
|
while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) {
|
|
tail = call->acks_tail;
|
|
smp_read_barrier_depends();
|
|
_skb = acks_window[tail] & ~1;
|
|
smp_mb();
|
|
call->acks_tail = (call->acks_tail + 1) & (winsz - 1);
|
|
|
|
skb = (struct sk_buff *) _skb;
|
|
sp = rxrpc_skb(skb);
|
|
_debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
|
|
rxrpc_free_skb(skb);
|
|
}
|
|
|
|
kfree(acks_window);
|
|
}
|
|
|
|
/*
|
|
* process the extra information that may be appended to an ACK packet
|
|
*/
|
|
static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
|
|
unsigned latest, int nAcks)
|
|
{
|
|
struct rxrpc_ackinfo ackinfo;
|
|
struct rxrpc_peer *peer;
|
|
unsigned mtu;
|
|
|
|
if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) {
|
|
_leave(" [no ackinfo]");
|
|
return;
|
|
}
|
|
|
|
_proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
|
|
latest,
|
|
ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU),
|
|
ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max));
|
|
|
|
mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU));
|
|
|
|
peer = call->conn->trans->peer;
|
|
if (mtu < peer->maxdata) {
|
|
spin_lock_bh(&peer->lock);
|
|
peer->maxdata = mtu;
|
|
peer->mtu = mtu + peer->hdrsize;
|
|
spin_unlock_bh(&peer->lock);
|
|
_net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* process packets in the reception queue
|
|
*/
|
|
static int rxrpc_process_rx_queue(struct rxrpc_call *call,
|
|
u32 *_abort_code)
|
|
{
|
|
struct rxrpc_ackpacket ack;
|
|
struct rxrpc_skb_priv *sp;
|
|
struct sk_buff *skb;
|
|
bool post_ACK;
|
|
int latest;
|
|
u32 hard, tx;
|
|
|
|
_enter("");
|
|
|
|
process_further:
|
|
skb = skb_dequeue(&call->rx_queue);
|
|
if (!skb)
|
|
return -EAGAIN;
|
|
|
|
_net("deferred skb %p", skb);
|
|
|
|
sp = rxrpc_skb(skb);
|
|
|
|
_debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state);
|
|
|
|
post_ACK = false;
|
|
|
|
switch (sp->hdr.type) {
|
|
/* data packets that wind up here have been received out of
|
|
* order, need security processing or are jumbo packets */
|
|
case RXRPC_PACKET_TYPE_DATA:
|
|
_proto("OOSQ DATA %%%u { #%u }",
|
|
ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
|
|
|
|
/* secured packets must be verified and possibly decrypted */
|
|
if (rxrpc_verify_packet(call, skb, _abort_code) < 0)
|
|
goto protocol_error;
|
|
|
|
rxrpc_insert_oos_packet(call, skb);
|
|
goto process_further;
|
|
|
|
/* partial ACK to process */
|
|
case RXRPC_PACKET_TYPE_ACK:
|
|
if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) {
|
|
_debug("extraction failure");
|
|
goto protocol_error;
|
|
}
|
|
if (!skb_pull(skb, sizeof(ack)))
|
|
BUG();
|
|
|
|
latest = ntohl(sp->hdr.serial);
|
|
hard = ntohl(ack.firstPacket);
|
|
tx = atomic_read(&call->sequence);
|
|
|
|
_proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
|
|
latest,
|
|
ntohs(ack.maxSkew),
|
|
hard,
|
|
ntohl(ack.previousPacket),
|
|
ntohl(ack.serial),
|
|
rxrpc_acks[ack.reason],
|
|
ack.nAcks);
|
|
|
|
rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks);
|
|
|
|
if (ack.reason == RXRPC_ACK_PING) {
|
|
_proto("Rx ACK %%%u PING Request", latest);
|
|
rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
|
|
sp->hdr.serial, true);
|
|
}
|
|
|
|
/* discard any out-of-order or duplicate ACKs */
|
|
if (latest - call->acks_latest <= 0) {
|
|
_debug("discard ACK %d <= %d",
|
|
latest, call->acks_latest);
|
|
goto discard;
|
|
}
|
|
call->acks_latest = latest;
|
|
|
|
if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
|
|
call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY &&
|
|
call->state != RXRPC_CALL_SERVER_SEND_REPLY &&
|
|
call->state != RXRPC_CALL_SERVER_AWAIT_ACK)
|
|
goto discard;
|
|
|
|
_debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state);
|
|
|
|
if (hard > 0) {
|
|
if (hard - 1 > tx) {
|
|
_debug("hard-ACK'd packet %d not transmitted"
|
|
" (%d top)",
|
|
hard - 1, tx);
|
|
goto protocol_error;
|
|
}
|
|
|
|
if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY ||
|
|
call->state == RXRPC_CALL_SERVER_AWAIT_ACK) &&
|
|
hard > tx)
|
|
goto all_acked;
|
|
|
|
smp_rmb();
|
|
rxrpc_rotate_tx_window(call, hard - 1);
|
|
}
|
|
|
|
if (ack.nAcks > 0) {
|
|
if (hard - 1 + ack.nAcks > tx) {
|
|
_debug("soft-ACK'd packet %d+%d not"
|
|
" transmitted (%d top)",
|
|
hard - 1, ack.nAcks, tx);
|
|
goto protocol_error;
|
|
}
|
|
|
|
if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0)
|
|
goto protocol_error;
|
|
}
|
|
goto discard;
|
|
|
|
/* complete ACK to process */
|
|
case RXRPC_PACKET_TYPE_ACKALL:
|
|
goto all_acked;
|
|
|
|
/* abort and busy are handled elsewhere */
|
|
case RXRPC_PACKET_TYPE_BUSY:
|
|
case RXRPC_PACKET_TYPE_ABORT:
|
|
BUG();
|
|
|
|
/* connection level events - also handled elsewhere */
|
|
case RXRPC_PACKET_TYPE_CHALLENGE:
|
|
case RXRPC_PACKET_TYPE_RESPONSE:
|
|
case RXRPC_PACKET_TYPE_DEBUG:
|
|
BUG();
|
|
}
|
|
|
|
/* if we've had a hard ACK that covers all the packets we've sent, then
|
|
* that ends that phase of the operation */
|
|
all_acked:
|
|
write_lock_bh(&call->state_lock);
|
|
_debug("ack all %d", call->state);
|
|
|
|
switch (call->state) {
|
|
case RXRPC_CALL_CLIENT_AWAIT_REPLY:
|
|
call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
|
|
break;
|
|
case RXRPC_CALL_SERVER_AWAIT_ACK:
|
|
_debug("srv complete");
|
|
call->state = RXRPC_CALL_COMPLETE;
|
|
post_ACK = true;
|
|
break;
|
|
case RXRPC_CALL_CLIENT_SEND_REQUEST:
|
|
case RXRPC_CALL_SERVER_RECV_REQUEST:
|
|
goto protocol_error_unlock; /* can't occur yet */
|
|
default:
|
|
write_unlock_bh(&call->state_lock);
|
|
goto discard; /* assume packet left over from earlier phase */
|
|
}
|
|
|
|
write_unlock_bh(&call->state_lock);
|
|
|
|
/* if all the packets we sent are hard-ACK'd, then we can discard
|
|
* whatever we've got left */
|
|
_debug("clear Tx %d",
|
|
CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
|
|
|
|
del_timer_sync(&call->resend_timer);
|
|
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
|
|
clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
|
|
|
|
if (call->acks_window)
|
|
rxrpc_zap_tx_window(call);
|
|
|
|
if (post_ACK) {
|
|
/* post the final ACK message for userspace to pick up */
|
|
_debug("post ACK");
|
|
skb->mark = RXRPC_SKB_MARK_FINAL_ACK;
|
|
sp->call = call;
|
|
rxrpc_get_call(call);
|
|
spin_lock_bh(&call->lock);
|
|
if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0)
|
|
BUG();
|
|
spin_unlock_bh(&call->lock);
|
|
goto process_further;
|
|
}
|
|
|
|
discard:
|
|
rxrpc_free_skb(skb);
|
|
goto process_further;
|
|
|
|
protocol_error_unlock:
|
|
write_unlock_bh(&call->state_lock);
|
|
protocol_error:
|
|
rxrpc_free_skb(skb);
|
|
_leave(" = -EPROTO");
|
|
return -EPROTO;
|
|
}
|
|
|
|
/*
|
|
* post a message to the socket Rx queue for recvmsg() to pick up
|
|
*/
|
|
static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error,
|
|
bool fatal)
|
|
{
|
|
struct rxrpc_skb_priv *sp;
|
|
struct sk_buff *skb;
|
|
int ret;
|
|
|
|
_enter("{%d,%lx},%u,%u,%d",
|
|
call->debug_id, call->flags, mark, error, fatal);
|
|
|
|
/* remove timers and things for fatal messages */
|
|
if (fatal) {
|
|
del_timer_sync(&call->resend_timer);
|
|
del_timer_sync(&call->ack_timer);
|
|
clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
|
|
}
|
|
|
|
if (mark != RXRPC_SKB_MARK_NEW_CALL &&
|
|
!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
|
|
_leave("[no userid]");
|
|
return 0;
|
|
}
|
|
|
|
if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
|
|
skb = alloc_skb(0, GFP_NOFS);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
|
|
rxrpc_new_skb(skb);
|
|
|
|
skb->mark = mark;
|
|
|
|
sp = rxrpc_skb(skb);
|
|
memset(sp, 0, sizeof(*sp));
|
|
sp->error = error;
|
|
sp->call = call;
|
|
rxrpc_get_call(call);
|
|
|
|
spin_lock_bh(&call->lock);
|
|
ret = rxrpc_queue_rcv_skb(call, skb, true, fatal);
|
|
spin_unlock_bh(&call->lock);
|
|
BUG_ON(ret < 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* handle background processing of incoming call packets and ACK / abort
|
|
* generation
|
|
*/
|
|
void rxrpc_process_call(struct work_struct *work)
|
|
{
|
|
struct rxrpc_call *call =
|
|
container_of(work, struct rxrpc_call, processor);
|
|
struct rxrpc_ackpacket ack;
|
|
struct rxrpc_ackinfo ackinfo;
|
|
struct rxrpc_header hdr;
|
|
struct msghdr msg;
|
|
struct kvec iov[5];
|
|
unsigned long bits;
|
|
__be32 data, pad;
|
|
size_t len;
|
|
int genbit, loop, nbit, ioc, ret, mtu;
|
|
u32 abort_code = RX_PROTOCOL_ERROR;
|
|
u8 *acks = NULL;
|
|
|
|
//printk("\n--------------------\n");
|
|
_enter("{%d,%s,%lx} [%lu]",
|
|
call->debug_id, rxrpc_call_states[call->state], call->events,
|
|
(jiffies - call->creation_jif) / (HZ / 10));
|
|
|
|
if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) {
|
|
_debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX");
|
|
return;
|
|
}
|
|
|
|
/* there's a good chance we're going to have to send a message, so set
|
|
* one up in advance */
|
|
msg.msg_name = &call->conn->trans->peer->srx.transport.sin;
|
|
msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin);
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
hdr.epoch = call->conn->epoch;
|
|
hdr.cid = call->cid;
|
|
hdr.callNumber = call->call_id;
|
|
hdr.seq = 0;
|
|
hdr.type = RXRPC_PACKET_TYPE_ACK;
|
|
hdr.flags = call->conn->out_clientflag;
|
|
hdr.userStatus = 0;
|
|
hdr.securityIndex = call->conn->security_ix;
|
|
hdr._rsvd = 0;
|
|
hdr.serviceId = call->conn->service_id;
|
|
|
|
memset(iov, 0, sizeof(iov));
|
|
iov[0].iov_base = &hdr;
|
|
iov[0].iov_len = sizeof(hdr);
|
|
|
|
/* deal with events of a final nature */
|
|
if (test_bit(RXRPC_CALL_RELEASE, &call->events)) {
|
|
rxrpc_release_call(call);
|
|
clear_bit(RXRPC_CALL_RELEASE, &call->events);
|
|
}
|
|
|
|
if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) {
|
|
int error;
|
|
|
|
clear_bit(RXRPC_CALL_CONN_ABORT, &call->events);
|
|
clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events);
|
|
clear_bit(RXRPC_CALL_ABORT, &call->events);
|
|
|
|
error = call->conn->trans->peer->net_error;
|
|
_debug("post net error %d", error);
|
|
|
|
if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR,
|
|
error, true) < 0)
|
|
goto no_mem;
|
|
clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
|
|
goto kill_ACKs;
|
|
}
|
|
|
|
if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) {
|
|
ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE);
|
|
|
|
clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events);
|
|
clear_bit(RXRPC_CALL_ABORT, &call->events);
|
|
|
|
_debug("post conn abort");
|
|
|
|
if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
|
|
call->conn->error, true) < 0)
|
|
goto no_mem;
|
|
clear_bit(RXRPC_CALL_CONN_ABORT, &call->events);
|
|
goto kill_ACKs;
|
|
}
|
|
|
|
if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) {
|
|
hdr.type = RXRPC_PACKET_TYPE_BUSY;
|
|
genbit = RXRPC_CALL_REJECT_BUSY;
|
|
goto send_message;
|
|
}
|
|
|
|
if (test_bit(RXRPC_CALL_ABORT, &call->events)) {
|
|
ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE);
|
|
|
|
if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
|
|
ECONNABORTED, true) < 0)
|
|
goto no_mem;
|
|
hdr.type = RXRPC_PACKET_TYPE_ABORT;
|
|
data = htonl(call->abort_code);
|
|
iov[1].iov_base = &data;
|
|
iov[1].iov_len = sizeof(data);
|
|
genbit = RXRPC_CALL_ABORT;
|
|
goto send_message;
|
|
}
|
|
|
|
if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) {
|
|
genbit = RXRPC_CALL_ACK_FINAL;
|
|
|
|
ack.bufferSpace = htons(8);
|
|
ack.maxSkew = 0;
|
|
ack.serial = 0;
|
|
ack.reason = RXRPC_ACK_IDLE;
|
|
ack.nAcks = 0;
|
|
call->ackr_reason = 0;
|
|
|
|
spin_lock_bh(&call->lock);
|
|
ack.serial = call->ackr_serial;
|
|
ack.previousPacket = call->ackr_prev_seq;
|
|
ack.firstPacket = htonl(call->rx_data_eaten + 1);
|
|
spin_unlock_bh(&call->lock);
|
|
|
|
pad = 0;
|
|
|
|
iov[1].iov_base = &ack;
|
|
iov[1].iov_len = sizeof(ack);
|
|
iov[2].iov_base = &pad;
|
|
iov[2].iov_len = 3;
|
|
iov[3].iov_base = &ackinfo;
|
|
iov[3].iov_len = sizeof(ackinfo);
|
|
goto send_ACK;
|
|
}
|
|
|
|
if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) |
|
|
(1 << RXRPC_CALL_RCVD_ABORT))
|
|
) {
|
|
u32 mark;
|
|
|
|
if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events))
|
|
mark = RXRPC_SKB_MARK_REMOTE_ABORT;
|
|
else
|
|
mark = RXRPC_SKB_MARK_BUSY;
|
|
|
|
_debug("post abort/busy");
|
|
rxrpc_clear_tx_window(call);
|
|
if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0)
|
|
goto no_mem;
|
|
|
|
clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
|
|
clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
|
|
goto kill_ACKs;
|
|
}
|
|
|
|
if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) {
|
|
_debug("do implicit ackall");
|
|
rxrpc_clear_tx_window(call);
|
|
}
|
|
|
|
if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) {
|
|
write_lock_bh(&call->state_lock);
|
|
if (call->state <= RXRPC_CALL_COMPLETE) {
|
|
call->state = RXRPC_CALL_LOCALLY_ABORTED;
|
|
call->abort_code = RX_CALL_TIMEOUT;
|
|
set_bit(RXRPC_CALL_ABORT, &call->events);
|
|
}
|
|
write_unlock_bh(&call->state_lock);
|
|
|
|
_debug("post timeout");
|
|
if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
|
|
ETIME, true) < 0)
|
|
goto no_mem;
|
|
|
|
clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
|
|
goto kill_ACKs;
|
|
}
|
|
|
|
/* deal with assorted inbound messages */
|
|
if (!skb_queue_empty(&call->rx_queue)) {
|
|
switch (rxrpc_process_rx_queue(call, &abort_code)) {
|
|
case 0:
|
|
case -EAGAIN:
|
|
break;
|
|
case -ENOMEM:
|
|
goto no_mem;
|
|
case -EKEYEXPIRED:
|
|
case -EKEYREJECTED:
|
|
case -EPROTO:
|
|
rxrpc_abort_call(call, abort_code);
|
|
goto kill_ACKs;
|
|
}
|
|
}
|
|
|
|
/* handle resending */
|
|
if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
|
|
rxrpc_resend_timer(call);
|
|
if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events))
|
|
rxrpc_resend(call);
|
|
|
|
/* consider sending an ordinary ACK */
|
|
if (test_bit(RXRPC_CALL_ACK, &call->events)) {
|
|
_debug("send ACK: window: %d - %d { %lx }",
|
|
call->rx_data_eaten, call->ackr_win_top,
|
|
call->ackr_window[0]);
|
|
|
|
if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST &&
|
|
call->ackr_reason != RXRPC_ACK_PING_RESPONSE) {
|
|
/* ACK by sending reply DATA packet in this state */
|
|
clear_bit(RXRPC_CALL_ACK, &call->events);
|
|
goto maybe_reschedule;
|
|
}
|
|
|
|
genbit = RXRPC_CALL_ACK;
|
|
|
|
acks = kzalloc(call->ackr_win_top - call->rx_data_eaten,
|
|
GFP_NOFS);
|
|
if (!acks)
|
|
goto no_mem;
|
|
|
|
//hdr.flags = RXRPC_SLOW_START_OK;
|
|
ack.bufferSpace = htons(8);
|
|
ack.maxSkew = 0;
|
|
ack.serial = 0;
|
|
ack.reason = 0;
|
|
|
|
spin_lock_bh(&call->lock);
|
|
ack.reason = call->ackr_reason;
|
|
ack.serial = call->ackr_serial;
|
|
ack.previousPacket = call->ackr_prev_seq;
|
|
ack.firstPacket = htonl(call->rx_data_eaten + 1);
|
|
|
|
ack.nAcks = 0;
|
|
for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) {
|
|
nbit = loop * BITS_PER_LONG;
|
|
for (bits = call->ackr_window[loop]; bits; bits >>= 1
|
|
) {
|
|
_debug("- l=%d n=%d b=%lx", loop, nbit, bits);
|
|
if (bits & 1) {
|
|
acks[nbit] = RXRPC_ACK_TYPE_ACK;
|
|
ack.nAcks = nbit + 1;
|
|
}
|
|
nbit++;
|
|
}
|
|
}
|
|
call->ackr_reason = 0;
|
|
spin_unlock_bh(&call->lock);
|
|
|
|
pad = 0;
|
|
|
|
iov[1].iov_base = &ack;
|
|
iov[1].iov_len = sizeof(ack);
|
|
iov[2].iov_base = acks;
|
|
iov[2].iov_len = ack.nAcks;
|
|
iov[3].iov_base = &pad;
|
|
iov[3].iov_len = 3;
|
|
iov[4].iov_base = &ackinfo;
|
|
iov[4].iov_len = sizeof(ackinfo);
|
|
|
|
switch (ack.reason) {
|
|
case RXRPC_ACK_REQUESTED:
|
|
case RXRPC_ACK_DUPLICATE:
|
|
case RXRPC_ACK_OUT_OF_SEQUENCE:
|
|
case RXRPC_ACK_EXCEEDS_WINDOW:
|
|
case RXRPC_ACK_NOSPACE:
|
|
case RXRPC_ACK_PING:
|
|
case RXRPC_ACK_PING_RESPONSE:
|
|
goto send_ACK_with_skew;
|
|
case RXRPC_ACK_DELAY:
|
|
case RXRPC_ACK_IDLE:
|
|
goto send_ACK;
|
|
}
|
|
}
|
|
|
|
/* handle completion of security negotiations on an incoming
|
|
* connection */
|
|
if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) {
|
|
_debug("secured");
|
|
spin_lock_bh(&call->lock);
|
|
|
|
if (call->state == RXRPC_CALL_SERVER_SECURING) {
|
|
_debug("securing");
|
|
write_lock(&call->conn->lock);
|
|
if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
|
|
!test_bit(RXRPC_CALL_RELEASE, &call->events)) {
|
|
_debug("not released");
|
|
call->state = RXRPC_CALL_SERVER_ACCEPTING;
|
|
list_move_tail(&call->accept_link,
|
|
&call->socket->acceptq);
|
|
}
|
|
write_unlock(&call->conn->lock);
|
|
read_lock(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_COMPLETE)
|
|
set_bit(RXRPC_CALL_POST_ACCEPT, &call->events);
|
|
read_unlock(&call->state_lock);
|
|
}
|
|
|
|
spin_unlock_bh(&call->lock);
|
|
if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events))
|
|
goto maybe_reschedule;
|
|
}
|
|
|
|
/* post a notification of an acceptable connection to the app */
|
|
if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) {
|
|
_debug("post accept");
|
|
if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL,
|
|
0, false) < 0)
|
|
goto no_mem;
|
|
clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events);
|
|
goto maybe_reschedule;
|
|
}
|
|
|
|
/* handle incoming call acceptance */
|
|
if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) {
|
|
_debug("accepted");
|
|
ASSERTCMP(call->rx_data_post, ==, 0);
|
|
call->rx_data_post = 1;
|
|
read_lock_bh(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_COMPLETE)
|
|
set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events);
|
|
read_unlock_bh(&call->state_lock);
|
|
}
|
|
|
|
/* drain the out of sequence received packet queue into the packet Rx
|
|
* queue */
|
|
if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) {
|
|
while (call->rx_data_post == call->rx_first_oos)
|
|
if (rxrpc_drain_rx_oos_queue(call) < 0)
|
|
break;
|
|
goto maybe_reschedule;
|
|
}
|
|
|
|
/* other events may have been raised since we started checking */
|
|
goto maybe_reschedule;
|
|
|
|
send_ACK_with_skew:
|
|
ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) -
|
|
ntohl(ack.serial));
|
|
send_ACK:
|
|
mtu = call->conn->trans->peer->if_mtu;
|
|
mtu -= call->conn->trans->peer->hdrsize;
|
|
ackinfo.maxMTU = htonl(mtu);
|
|
ackinfo.rwind = htonl(32);
|
|
|
|
/* permit the peer to send us jumbo packets if it wants to */
|
|
ackinfo.rxMTU = htonl(5692);
|
|
ackinfo.jumbo_max = htonl(4);
|
|
|
|
hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
|
|
_proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
|
|
ntohl(hdr.serial),
|
|
ntohs(ack.maxSkew),
|
|
ntohl(ack.firstPacket),
|
|
ntohl(ack.previousPacket),
|
|
ntohl(ack.serial),
|
|
rxrpc_acks[ack.reason],
|
|
ack.nAcks);
|
|
|
|
del_timer_sync(&call->ack_timer);
|
|
if (ack.nAcks > 0)
|
|
set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags);
|
|
goto send_message_2;
|
|
|
|
send_message:
|
|
_debug("send message");
|
|
|
|
hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
|
|
_proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial));
|
|
send_message_2:
|
|
|
|
len = iov[0].iov_len;
|
|
ioc = 1;
|
|
if (iov[4].iov_len) {
|
|
ioc = 5;
|
|
len += iov[4].iov_len;
|
|
len += iov[3].iov_len;
|
|
len += iov[2].iov_len;
|
|
len += iov[1].iov_len;
|
|
} else if (iov[3].iov_len) {
|
|
ioc = 4;
|
|
len += iov[3].iov_len;
|
|
len += iov[2].iov_len;
|
|
len += iov[1].iov_len;
|
|
} else if (iov[2].iov_len) {
|
|
ioc = 3;
|
|
len += iov[2].iov_len;
|
|
len += iov[1].iov_len;
|
|
} else if (iov[1].iov_len) {
|
|
ioc = 2;
|
|
len += iov[1].iov_len;
|
|
}
|
|
|
|
ret = kernel_sendmsg(call->conn->trans->local->socket,
|
|
&msg, iov, ioc, len);
|
|
if (ret < 0) {
|
|
_debug("sendmsg failed: %d", ret);
|
|
read_lock_bh(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_DEAD)
|
|
rxrpc_queue_call(call);
|
|
read_unlock_bh(&call->state_lock);
|
|
goto error;
|
|
}
|
|
|
|
switch (genbit) {
|
|
case RXRPC_CALL_ABORT:
|
|
clear_bit(genbit, &call->events);
|
|
clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
|
|
goto kill_ACKs;
|
|
|
|
case RXRPC_CALL_ACK_FINAL:
|
|
write_lock_bh(&call->state_lock);
|
|
if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK)
|
|
call->state = RXRPC_CALL_COMPLETE;
|
|
write_unlock_bh(&call->state_lock);
|
|
goto kill_ACKs;
|
|
|
|
default:
|
|
clear_bit(genbit, &call->events);
|
|
switch (call->state) {
|
|
case RXRPC_CALL_CLIENT_AWAIT_REPLY:
|
|
case RXRPC_CALL_CLIENT_RECV_REPLY:
|
|
case RXRPC_CALL_SERVER_RECV_REQUEST:
|
|
case RXRPC_CALL_SERVER_ACK_REQUEST:
|
|
_debug("start ACK timer");
|
|
rxrpc_propose_ACK(call, RXRPC_ACK_DELAY,
|
|
call->ackr_serial, false);
|
|
default:
|
|
break;
|
|
}
|
|
goto maybe_reschedule;
|
|
}
|
|
|
|
kill_ACKs:
|
|
del_timer_sync(&call->ack_timer);
|
|
if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events))
|
|
rxrpc_put_call(call);
|
|
clear_bit(RXRPC_CALL_ACK, &call->events);
|
|
|
|
maybe_reschedule:
|
|
if (call->events || !skb_queue_empty(&call->rx_queue)) {
|
|
read_lock_bh(&call->state_lock);
|
|
if (call->state < RXRPC_CALL_DEAD)
|
|
rxrpc_queue_call(call);
|
|
read_unlock_bh(&call->state_lock);
|
|
}
|
|
|
|
/* don't leave aborted connections on the accept queue */
|
|
if (call->state >= RXRPC_CALL_COMPLETE &&
|
|
!list_empty(&call->accept_link)) {
|
|
_debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }",
|
|
call, call->events, call->flags,
|
|
ntohl(call->conn->cid));
|
|
|
|
read_lock_bh(&call->state_lock);
|
|
if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
|
|
!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
|
|
rxrpc_queue_call(call);
|
|
read_unlock_bh(&call->state_lock);
|
|
}
|
|
|
|
error:
|
|
clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags);
|
|
kfree(acks);
|
|
|
|
/* because we don't want two CPUs both processing the work item for one
|
|
* call at the same time, we use a flag to note when it's busy; however
|
|
* this means there's a race between clearing the flag and setting the
|
|
* work pending bit and the work item being processed again */
|
|
if (call->events && !work_pending(&call->processor)) {
|
|
_debug("jumpstart %x", ntohl(call->conn->cid));
|
|
rxrpc_queue_call(call);
|
|
}
|
|
|
|
_leave("");
|
|
return;
|
|
|
|
no_mem:
|
|
_debug("out of memory");
|
|
goto maybe_reschedule;
|
|
}
|