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rxrpc: Transmit ACKs at the point of generation

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For ACKs generated inside the I/O thread, transmit the ACK at the point of
generation.  Where the ACK is generated outside of the I/O thread, it's
offloaded to the I/O thread to transmit it.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
This commit is contained in:
David Howells
2020-01-30 21:48:13 +00:00
parent a2cf3264f3
commit b0346843b1
9 changed files with 5 additions and 75 deletions
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42
net/rxrpc/output.c
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@@ -203,12 +203,11 @@ static void rxrpc_cancel_rtt_probe(struct rxrpc_call *call,
}
/*
* Send an ACK call packet.
* Transmit an ACK packet.
*/
static int rxrpc_send_ack_packet(struct rxrpc_local *local, struct rxrpc_txbuf *txb)
int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
{
struct rxrpc_connection *conn;
struct rxrpc_call *call = txb->call;
struct msghdr msg;
struct kvec iov[1];
rxrpc_serial_t serial;
@@ -271,43 +270,6 @@ static int rxrpc_send_ack_packet(struct rxrpc_local *local, struct rxrpc_txbuf *
return ret;
}
/*
* ACK transmitter for a local endpoint. The UDP socket locks around each
* transmission, so we can only transmit one packet at a time, ACK, DATA or
* otherwise.
*/
void rxrpc_transmit_ack_packets(struct rxrpc_local *local)
{
LIST_HEAD(queue);
int ret;
rxrpc_see_local(local, rxrpc_local_see_tx_ack);
if (list_empty(&local->ack_tx_queue))
return;
spin_lock(&local->ack_tx_lock);
list_splice_tail_init(&local->ack_tx_queue, &queue);
spin_unlock(&local->ack_tx_lock);
while (!list_empty(&queue)) {
struct rxrpc_txbuf *txb =
list_entry(queue.next, struct rxrpc_txbuf, tx_link);
ret = rxrpc_send_ack_packet(local, txb);
if (ret < 0 && ret != -ECONNRESET) {
spin_lock(&local->ack_tx_lock);
list_splice_init(&queue, &local->ack_tx_queue);
spin_unlock(&local->ack_tx_lock);
break;
}
list_del_init(&txb->tx_link);
rxrpc_put_call(txb->call, rxrpc_call_put_send_ack);
rxrpc_put_txbuf(txb, rxrpc_txbuf_put_ack_tx);
}
}
/*
* Send an ABORT call packet.
*/