tree 864cecee821db7737d4ebb1d13ab16138141e1dd
parent 742e67d2b7eec559e2dcec47970a3471b49f0b5e
author Thomas Falcon <tlfalcon@linux.vnet.ibm.com> 1488737921 -0600
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1513240100 +0100

ibmvnic: Fix overflowing firmware/hardware TX queue


[ Upstream commit 142c0ac445792c492579cb01f1cfd4e32e6dfcce ]

Use a counter to track the number of outstanding transmissions sent
that have not received completions. If the counter reaches the maximum
number of queue entries, stop transmissions on that queue. As we receive
more completions from firmware, wake the queue once the counter reaches
an acceptable level.

This patch prevents hardware/firmware TX queue from filling up and
and generating errors.  Since incorporating this fix, internal testing
has reported that these firmware errors have stopped.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>