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net: switch secpath to use skb extension infrastructure

Browse source 
Remove skb->sp and allocate secpath storage via extension
infrastructure.  This also reduces sk_buff by 8 bytes on x86_64.

Total size of allyesconfig kernel is reduced slightly, as there is
less inlined code (one conditional atomic op instead of two on
skb_clone).

No differences in throughput in following ipsec performance tests:
- transport mode with aes on 10GB link
- tunnel mode between two network namespaces with aes and null cipher

Signed-off-by: Florian Westphal <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Florian Westphal 2018-12-18 17:15:27 +01:00 • committed by David S. Miller
commit 4165079ba3
5 changed files with 59 additions and 83 deletions
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22
include/net/xfrm.h
View file

@ -1096,7 +1096,6 @@ struct xfrm_offload {
};
struct sec_path {
refcount_t refcnt;
int len;
int olen;
@ -1104,32 +1103,13 @@ struct sec_path {
struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH];
};
static inline struct sec_path *
secpath_get(struct sec_path *sp)
{
if (sp)
refcount_inc(&sp->refcnt);
return sp;
}
void __secpath_destroy(struct sec_path *sp);
static inline void
secpath_put(struct sec_path *sp)
{
if (sp && refcount_dec_and_test(&sp->refcnt))
__secpath_destroy(sp);
}
struct sec_path *secpath_dup(struct sec_path *src);
struct sec_path *secpath_set(struct sk_buff *skb);
static inline void
secpath_reset(struct sk_buff *skb)
{
#ifdef CONFIG_XFRM
secpath_put(skb->sp);
skb->sp = NULL;
skb_ext_del(skb, SKB_EXT_SEC_PATH);
#endif
}