diff options
Diffstat (limited to 'net/rxrpc/input.c')
| -rw-r--r-- | net/rxrpc/input.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index c89647eae86d..23a5e61d8f79 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -631,6 +631,43 @@ found: } /* + * Process the response to a ping that we sent to find out if we lost an ACK. + * + * If we got back a ping response that indicates a lower tx_top than what we + * had at the time of the ping transmission, we adjudge all the DATA packets + * sent between the response tx_top and the ping-time tx_top to have been lost. + */ +static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call) +{ + rxrpc_seq_t top, bottom, seq; + bool resend = false; + + spin_lock_bh(&call->lock); + + bottom = call->tx_hard_ack + 1; + top = call->acks_lost_top; + if (before(bottom, top)) { + for (seq = bottom; before_eq(seq, top); seq++) { + int ix = seq & RXRPC_RXTX_BUFF_MASK; + u8 annotation = call->rxtx_annotations[ix]; + u8 anno_type = annotation & RXRPC_TX_ANNO_MASK; + + if (anno_type != RXRPC_TX_ANNO_UNACK) + continue; + annotation &= ~RXRPC_TX_ANNO_MASK; + annotation |= RXRPC_TX_ANNO_RETRANS; + call->rxtx_annotations[ix] = annotation; + resend = true; + } + } + + spin_unlock_bh(&call->lock); + + if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) + rxrpc_queue_call(call); +} + +/* * Process a ping response. */ static void rxrpc_input_ping_response(struct rxrpc_call *call, @@ -645,6 +682,9 @@ static void rxrpc_input_ping_response(struct rxrpc_call *call, smp_rmb(); ping_serial = call->ping_serial; + if (orig_serial == call->acks_lost_ping) + rxrpc_input_check_for_lost_ack(call); + if (!test_bit(RXRPC_CALL_PINGING, &call->flags) || before(orig_serial, ping_serial)) return; |