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xfrm: store xfrm_mode directly, not its address

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This structure is now only 4 bytes, so its more efficient
to cache a copy rather than its address.

No significant size difference in allmodconfig vmlinux.

With non-modular kernel that has all XFRM options enabled, this
series reduces vmlinux image size by ~11kb. All xfrm_mode
indirections are gone and all modes are built-in.

before (ipsec-next master):
    text      data      bss         dec   filename
21071494   7233140 11104324    39408958   vmlinux.master

after this series:
21066448   7226772 11104324    39397544   vmlinux.patched

With allmodconfig kernel, the size increase is only 362 bytes,
even all the xfrm config options removed in this series are
modular.

before:
    text      data     bss      dec   filename
15731286   6936912 4046908 26715106   vmlinux.master

after this series:
15731492   6937068  4046908  26715468 vmlinux

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal
2019-03-29 21:16:32 +01:00
committed by Steffen Klassert
parent 4c145dce26
commit c9500d7b7d
13 changed files with 55 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
net/xfrm/xfrm_input.c
View File

@@ -351,12 +351,12 @@ xfrm_inner_mode_encap_remove(struct xfrm_state *x,
static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
{
const struct xfrm_mode *inner_mode = x->inner_mode;
const struct xfrm_mode *inner_mode = &x->inner_mode;
const struct xfrm_state_afinfo *afinfo;
int err = -EAFNOSUPPORT;
rcu_read_lock();
afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode->family);
afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
if (likely(afinfo))
err = afinfo->extract_input(x, skb);
@@ -482,7 +482,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop;
}
family = x->outer_mode->family;
family = x->outer_mode.family;
/* An encap_type of -1 indicates async resumption. */
if (encap_type == -1) {
@@ -666,7 +666,7 @@ resume:
XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
inner_mode = x->inner_mode;
inner_mode = &x->inner_mode;
if (x->sel.family == AF_UNSPEC) {
inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
@@ -681,7 +681,7 @@ resume:
goto drop;
}
if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) {
decaps = 1;
break;
}
@@ -691,7 +691,7 @@ resume:
* transport mode so the outer address is identical.
*/
daddr = &x->id.daddr;
family = x->outer_mode->family;
family = x->outer_mode.family;
err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
if (err < 0) {
@@ -721,7 +721,7 @@ resume:
err = -EAFNOSUPPORT;
rcu_read_lock();
afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode->family);
afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
if (likely(afinfo))
err = afinfo->transport_finish(skb, xfrm_gro || async);
rcu_read_unlock();