net: dont update dev->trans_start in 10GB drivers

Followup of commits 9d21493b4beb8f918ba248032fefa393074a5e2b
and 08baf561083bc27a953aa087dd8a664bb2b88e8e
(net: tx scalability works : trans_start)
(net: txq_trans_update() helper)

Now that core network takes care of trans_start updates, dont do it
in drivers themselves, if possible. Multi queue drivers can
avoid one cache miss (on dev->trans_start) in their start_xmit()
handler.

Exceptions are NETIF_F_LLTX drivers (vxge & tehuti)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/tehuti.c b/drivers/net/tehuti.c
index 7f4a9683ba1e..093807a182f2 100644
--- a/drivers/net/tehuti.c
+++ b/drivers/net/tehuti.c
@@ -1718,8 +1718,9 @@ static int bdx_tx_transmit(struct sk_buff *skb, struct net_device *ndev)
         WRITE_REG(priv, f->m.reg_WPTR, f->m.wptr & TXF_WPTR_WR_PTR);
 
 #endif
-        ndev->trans_start = jiffies;
-
+#ifdef BDX_LLTX
+        ndev->trans_start = jiffies; /* NETIF_F_LLTX driver :( */
+#endif
         priv->net_stats.tx_packets++;
         priv->net_stats.tx_bytes += skb->len;