cxgb4: when disabling dcb set txq dcb priority to 0

[ Upstream commit 5ce36338a30f9814fc4824f9fe6c20cd83d872c7 ]

When we are disabling DCB, store "0" in txq->dcb_prio
since that's used for future TX Work Request "OVLAN_IDX"
values. Setting non zero priority upon disabling DCB
would halt the traffic.

Reported-by: AMG Zollner Robert <robert@cloudmedia.eu>
CC: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.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>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index c395b21..c71a52a 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -274,7 +274,7 @@ static void dcb_tx_queue_prio_enable(struct net_device *dev, int enable)
                                "Can't %s DCB Priority on port %d, TX Queue %d: err=%d\n",
                                enable ? "set" : "unset", pi->port_id, i, -err);
                else
-                       txq->dcb_prio = value;
+                       txq->dcb_prio = enable ? value : 0;
        }
 }