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ibmvnic: Zero used TX descriptor counter on reset

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[ Upstream commit 41f714672f ]

The counter that tracks used TX descriptors pending completion
needs to be zeroed as part of a device reset. This change fixes
a bug causing transmit queues to be stopped unnecessarily and in
some cases a transmit queue stall and timeout reset. If the counter
is not reset, the remaining descriptors will not be "removed",
effectively reducing queue capacity. If the queue is over half full,
it will cause the queue to stall if 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@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Falcon 2018-04-06 18:37:03 -05:00 committed by Greg Kroah-Hartman
parent d04e5e72df
commit 378a1e49f9
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/ibm/ibmvnic.c
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@ -1962,6 +1962,7 @@ static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
}
memset(scrq->msgs, 0, 4 * PAGE_SIZE);
atomic_set(&scrq->used, 0);
scrq->cur = 0;
rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,