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drbd: when receive times out on meta socket, also check last receive time on data socket

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If we have an asymetrically congested network, we may send P_PING,
but due to congestion, the corresponding P_PING_ACK would time out,
and we would drop a (congested, but otherwise) healthy connection
("PingAck did not arrive in time.")

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2011-06-20 14:44:45 +02:00 committed by Philipp Reisner
parent 5a8b424276
commit cb6518cbef
1 changed files with 6 additions and 0 deletions
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6
drivers/block/drbd/drbd_receiver.c
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@ -4602,6 +4602,11 @@ int drbd_asender(struct drbd_thread *thi)
dev_err(DEV, "meta connection shut down by peer.\n");
goto reconnect;
} else if (rv == -EAGAIN) {
/* If the data socket received something meanwhile,
* that is good enough: peer is still alive. */
if (time_after(mdev->last_received,
jiffies - mdev->meta.socket->sk->sk_rcvtimeo))
continue;
if (ping_timeout_active) {
dev_err(DEV, "PingAck did not arrive in time.\n");
goto reconnect;
@ -4637,6 +4642,7 @@ int drbd_asender(struct drbd_thread *thi)
goto reconnect;
}
if (received == expect) {
mdev->last_received = jiffies;
D_ASSERT(cmd != NULL);
if (!cmd->process(mdev, h))
goto reconnect;