drbd: when receive times out on meta socket, also check last receive time on data socket
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>
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 25d32c5..43beaca 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -4602,6 +4602,11 @@
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 @@
goto reconnect;
}
if (received == expect) {
+ mdev->last_received = jiffies;
D_ASSERT(cmd != NULL);
if (!cmd->process(mdev, h))
goto reconnect;