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authorBen Hutchings <bhutchings@solarflare.com>2014-01-10 22:17:03 +0000
committerDavid S. Miller <davem@davemloft.net>2014-01-14 14:46:02 -0800
commitd87d04a7851f067a06bb10acca8aca62a8cad6f0 (patch)
tree0544248bbd3fc041c891727d1f6582bb036683a4 /net/core/dev.c
parent20567661a1eb3eab30c94cab958426bdaa83d271 (diff)
downloadlinux-linaro-stable-d87d04a7851f067a06bb10acca8aca62a8cad6f0.tar.gz
net: Add net_dev_start_xmit trace event, exposing more skb fields
The existing net/net_dev_xmit trace event provides little information about the skb that has been passed to the driver, and it is not simple to add more since the skb may already have been freed at the point the event is emitted. Add a separate trace event before the skb is passed to the driver, including most fields that are likely to be interesting for debugging driver datapath behaviour. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 0703ee04c670..9e93a1464216 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2596,6 +2596,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
dev_queue_xmit_nit(skb, dev);
skb_len = skb->len;
+ trace_net_dev_start_xmit(skb, dev);
rc = ops->ndo_start_xmit(skb, dev);
trace_net_dev_xmit(skb, rc, dev, skb_len);
if (rc == NETDEV_TX_OK)
@@ -2614,6 +2615,7 @@ gso:
dev_queue_xmit_nit(nskb, dev);
skb_len = nskb->len;
+ trace_net_dev_start_xmit(nskb, dev);
rc = ops->ndo_start_xmit(nskb, dev);
trace_net_dev_xmit(nskb, rc, dev, skb_len);
if (unlikely(rc != NETDEV_TX_OK)) {