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| author | Tom Herbert | 2014-09-01 00:12:42 +0200 |
|---|---|---|
| committer | David S. Miller | 2014-09-02 06:36:27 +0200 |
| commit | d96535a17dbbafd567961d14c08c0984ddda9c3c (patch) | |
| tree | aa07db9a2ef6ea095f7b38ec3be18c92d4f55506 /include/linux/skbuff.h | |
| parent | net: Support for csum_bad in skbuff (diff) | |
| download | kernel-qcow2-linux-d96535a17dbbafd567961d14c08c0984ddda9c3c.tar.gz kernel-qcow2-linux-d96535a17dbbafd567961d14c08c0984ddda9c3c.tar.xz kernel-qcow2-linux-d96535a17dbbafd567961d14c08c0984ddda9c3c.zip | |
net: Infrastructure for checksum unnecessary conversions
For normal path, added skb_checksum_try_convert which is called
to attempt to convert CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE. The
primary condition to allow this is that ip_summed is CHECKSUM_NONE
and csum_valid is true, which will be the state after consuming
a CHECKSUM_UNNECESSARY.
For GRO path, added skb_gro_checksum_try_convert which is the GRO
analogue of skb_checksum_try_convert. The primary condition to allow
this is that NAPI_GRO_CB(skb)->csum_cnt == 0 and
NAPI_GRO_CB(skb)->csum_valid is set. This implies that we have consumed
all available CHECKSUM_UNNECESSARY checksums in the GRO path.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 23710a243439..02529fcad1ac 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2942,6 +2942,26 @@ static inline __wsum null_compute_pseudo(struct sk_buff *skb, int proto) #define skb_checksum_simple_validate(skb) \ __skb_checksum_validate(skb, 0, true, false, 0, null_compute_pseudo) +static inline bool __skb_checksum_convert_check(struct sk_buff *skb) +{ + return (skb->ip_summed == CHECKSUM_NONE && + skb->csum_valid && !skb->csum_bad); +} + +static inline void __skb_checksum_convert(struct sk_buff *skb, + __sum16 check, __wsum pseudo) +{ + skb->csum = ~pseudo; + skb->ip_summed = CHECKSUM_COMPLETE; +} + +#define skb_checksum_try_convert(skb, proto, check, compute_pseudo) \ +do { \ + if (__skb_checksum_convert_check(skb)) \ + __skb_checksum_convert(skb, check, \ + compute_pseudo(skb, proto)); \ +} while (0) + #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) void nf_conntrack_destroy(struct nf_conntrack *nfct); static inline void nf_conntrack_put(struct nf_conntrack *nfct) |