net-bnx2x: dont reload on GRO change

bnx2x_set_features() forces a driver reload if GRO setting is changed.

A reload makes the ethernet port unresponsive for about 5 seconds.

This is not needed in the common case LRO is enabled, as LRO
(TPA_ENABLE_FLAG) has precedence over GRO (GRO_ENABLE_FLAG)

Tested:
 Verified that "ethtool -K eth0 gro {on|off}" doesn't blackout
 the NIC anymore

Google-Bug-Id: 8440442
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Dmitry Kravkov <dmitry@broadcom.com>
Acked-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index b8fbe26..6cc5101 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -4599,6 +4599,7 @@ int bnx2x_set_features(struct net_device *dev, netdev_features_t features)
 {
        struct bnx2x *bp = netdev_priv(dev);
        u32 flags = bp->flags;
+       u32 changes;
        bool bnx2x_reload = false;
 
        if (features & NETIF_F_LRO)
@@ -4623,10 +4624,16 @@ int bnx2x_set_features(struct net_device *dev, netdev_features_t features)
                }
        }
 
-       if (flags ^ bp->flags) {
-               bp->flags = flags;
+       changes = flags ^ bp->flags;
+
+       /* if GRO is changed while LRO is enabled, dont force a reload */
+       if ((changes & GRO_ENABLE_FLAG) && (flags & TPA_ENABLE_FLAG))
+               changes &= ~GRO_ENABLE_FLAG;
+
+       if (changes)
                bnx2x_reload = true;
-       }
+
+       bp->flags = flags;
 
        if (bnx2x_reload) {
                if (bp->recovery_state == BNX2X_RECOVERY_DONE)