net: release dst entry while cache-hot for GSO case too

Non-GSO code drops dst entry for performance reasons, but
the same is missing for GSO code. Drop dst while cache-hot
for GSO case too.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index be9924f..a8d68cd 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1853,6 +1853,14 @@ gso:
 
                skb->next = nskb->next;
                nskb->next = NULL;
+
+               /*
+                * If device doesnt need nskb->dst, release it right now while
+                * its hot in this cpu cache
+                */
+               if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
+                       skb_dst_drop(nskb);
+
                rc = ops->ndo_start_xmit(nskb, dev);
                if (unlikely(rc != NETDEV_TX_OK)) {
                        if (rc & ~NETDEV_TX_MASK)