diff options
| author | Eric Dumazet | 2014-03-30 06:28:21 +0200 |
|---|---|---|
| committer | David S. Miller | 2014-03-31 22:26:40 +0200 |
| commit | a50e233c50dbc881abaa0e4070789064e8d12d70 (patch) | |
| tree | 5c4c25d28e0f08f258ff8304fd4582658c1a0780 /include | |
| parent | rds: prevent dereference of a NULL device in rds_iw_laddr_check (diff) | |
| download | kernel-qcow2-linux-a50e233c50dbc881abaa0e4070789064e8d12d70.tar.gz kernel-qcow2-linux-a50e233c50dbc881abaa0e4070789064e8d12d70.tar.xz kernel-qcow2-linux-a50e233c50dbc881abaa0e4070789064e8d12d70.zip | |
net-gro: restore frag0 optimization
Main difference between napi_frags_skb() and napi_gro_receive() is that
the later is called while ethernet header was already pulled by the NIC
driver (eth_type_trans() was called before napi_gro_receive())
Jerry Chu in commit 299603e8370a ("net-gro: Prepare GRO stack for the
upcoming tunneling support") tried to remove this difference by calling
eth_type_trans() from napi_frags_skb() instead of doing this later from
napi_frags_finish()
Goal was that napi_gro_complete() could call
ptype->callbacks.gro_complete(skb, 0) (offset of first network header =
0)
Also, xxx_gro_receive() handlers all use off = skb_gro_offset(skb) to
point to their own header, for the current skb and ones held in gro_list
Problem is this cleanup work defeated the frag0 optimization:
It turns out the consecutive pskb_may_pull() calls are too expensive.
This patch brings back the frag0 stuff in napi_frags_skb().
As all skb have their mac header in skb head, we no longer need
skb_gro_mac_header()
Reported-by: Michal Schmidt <mschmidt@redhat.com>
Fixes: 299603e8370a ("net-gro: Prepare GRO stack for the upcoming tunneling support")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jerry Chu <hkchu@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 45537ed7a5b3..775cc956ff78 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2014,11 +2014,6 @@ static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen, return skb->data + offset; } -static inline void *skb_gro_mac_header(struct sk_buff *skb) -{ - return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb); -} - static inline void *skb_gro_network_header(struct sk_buff *skb) { return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + |