diff options
| author | Tom Herbert <therbert@google.com> | 2014-08-31 15:12:42 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-01 21:36:27 -0700 |
| commit | d96535a17dbbafd567961d14c08c0984ddda9c3c (patch) | |
| tree | aa07db9a2ef6ea095f7b38ec3be18c92d4f55506 /include/linux/netdevice.h | |
| parent | 5a21232983aa7acfe7fd26170832a9e0a4a7b4ae (diff) | |
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/netdevice.h')
| -rw-r--r-- | include/linux/netdevice.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index a0ab6d9d400a..5be20a7bbb0d 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2233,6 +2233,26 @@ static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb) #define skb_gro_checksum_simple_validate(skb) \ __skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo) +static inline bool __skb_gro_checksum_convert_check(struct sk_buff *skb) +{ + return (NAPI_GRO_CB(skb)->csum_cnt == 0 && + !NAPI_GRO_CB(skb)->csum_valid); +} + +static inline void __skb_gro_checksum_convert(struct sk_buff *skb, + __sum16 check, __wsum pseudo) +{ + NAPI_GRO_CB(skb)->csum = ~pseudo; + NAPI_GRO_CB(skb)->csum_valid = 1; +} + +#define skb_gro_checksum_try_convert(skb, proto, check, compute_pseudo) \ +do { \ + if (__skb_gro_checksum_convert_check(skb)) \ + __skb_gro_checksum_convert(skb, check, \ + compute_pseudo(skb, proto)); \ +} while (0) + static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, |