diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-05-31 15:22:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-06-01 17:41:36 -0700 |
| commit | 595d0b29463343c3be995d3948930b8231e5b8cd (patch) | |
| tree | 5b9776e46e62588b659a61e9bbdd20614705a0fb | |
| parent | 524c6f691b99065577b245b250efe93fb0cda5c4 (diff) | |
udp: avoid csum_partial() for validated skb
In commit e6afc8ace6dd5 ("udp: remove headers from UDP packets before
queueing"), udp_csum_pull_header() helper was added but missed fact
that CHECKSUM_UNNECESSARY packets were now converted to CHECKSUM_NONE
and skb->csum_valid was set to 1 for them.
Since csum_partial() is quite expensive, even for 8-byte area, it is
worth adding a test.
We also can use skb->data instead of udp_hdr() as we are pulling
UDP headers, as it is sightly faster.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/udp.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/udp.h b/include/net/udp.h index ae07f375370d..8894d7144189 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -160,8 +160,8 @@ void udp_set_csum(bool nocheck, struct sk_buff *skb, static inline void udp_csum_pull_header(struct sk_buff *skb) { - if (skb->ip_summed == CHECKSUM_NONE) - skb->csum = csum_partial(udp_hdr(skb), sizeof(struct udphdr), + if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE) + skb->csum = csum_partial(skb->data, sizeof(struct udphdr), skb->csum); skb_pull_rcsum(skb, sizeof(struct udphdr)); UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr); |