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net: skb_gro_checksum_* functions

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Add skb_gro_checksum_validate, skb_gro_checksum_validate_zero_check,
and skb_gro_checksum_simple_validate, and __skb_gro_checksum_complete.
These are the cognates of the normal checksum functions but are used
in the gro_receive path and operate on GRO related fields in sk_buffs.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2014-08-22 13:33:47 -07:00 • committed by David S. Miller
parent 8fc54f6891
commit 573e8fca25
2 changed files with 107 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

76
include/linux/netdevice.h
View file

@ -1883,7 +1883,13 @@ struct napi_gro_cb {
u16 proto;
/* Used in udp_gro_receive */
u16 udp_mark;
u8 udp_mark:1;
/* GRO checksum is valid */
u8 csum_valid:1;
/* Number encapsulation layers crossed */
u8 encapsulation;
/* used to support CHECKSUM_COMPLETE for tunneling protocols */
__wsum csum;
@ -2154,11 +2160,77 @@ static inline void *skb_gro_network_header(struct sk_buff *skb)
static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
const void *start, unsigned int len)
{
if (skb->ip_summed == CHECKSUM_COMPLETE)
if (NAPI_GRO_CB(skb)->csum_valid)
NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
csum_partial(start, len, 0));
}
/* GRO checksum functions. These are logical equivalents of the normal
* checksum functions (in skbuff.h) except that they operate on the GRO
* offsets and fields in sk_buff.
*/
__sum16 __skb_gro_checksum_complete(struct sk_buff *skb);
static inline bool __skb_gro_checksum_validate_needed(struct sk_buff *skb,
bool zero_okay,
__sum16 check)
{
return (skb->ip_summed != CHECKSUM_PARTIAL &&
(skb->ip_summed != CHECKSUM_UNNECESSARY ||
(NAPI_GRO_CB(skb)->encapsulation > skb->encapsulation)) &&
(!zero_okay || check));
}
static inline __sum16 __skb_gro_checksum_validate_complete(struct sk_buff *skb,
__wsum psum)
{
if (NAPI_GRO_CB(skb)->csum_valid &&
!csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum)))
return 0;
NAPI_GRO_CB(skb)->csum = psum;
return __skb_gro_checksum_complete(skb);
}
/* Update skb for CHECKSUM_UNNECESSARY when we verified a top level
* checksum or an encapsulated one during GRO. This saves work
* if we fallback to normal path with the packet.
*/
static inline void skb_gro_incr_csum_unnecessary(struct sk_buff *skb)
{
if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
if (NAPI_GRO_CB(skb)->encapsulation)
skb->encapsulation = 1;
} else if (skb->ip_summed != CHECKSUM_PARTIAL) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->encapsulation = 0;
}
}
#define __skb_gro_checksum_validate(skb, proto, zero_okay, check, \
compute_pseudo) \
({ \
__sum16 __ret = 0; \
if (__skb_gro_checksum_validate_needed(skb, zero_okay, check)) \
__ret = __skb_gro_checksum_validate_complete(skb, \
compute_pseudo(skb, proto)); \
if (!__ret) \
skb_gro_incr_csum_unnecessary(skb); \
__ret; \
})
#define skb_gro_checksum_validate(skb, proto, compute_pseudo) \
__skb_gro_checksum_validate(skb, proto, false, 0, compute_pseudo)
#define skb_gro_checksum_validate_zero_check(skb, proto, check, \
compute_pseudo) \
__skb_gro_checksum_validate(skb, proto, true, check, compute_pseudo)
#define skb_gro_checksum_simple_validate(skb) \
__skb_gro_checksum_validate(skb, 0, false, 0, null_compute_pseudo)
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr,