lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[SK_BUFF]: Convert skb->tail to sk_buff_data_t

Browse Source 
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)

Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2007-04-19 20:29:13 -07:00
committed by David S. Miller
parent be8bd86321
commit 27a884dc3c
110 changed files with 396 additions and 329 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
net/sched/cls_api.c
View File

@ -323,7 +323,7 @@ tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, unsigned long fh,
{
struct tcmsg *tcm;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
unsigned char *b = skb_tail_pointer(skb);
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
tcm = NLMSG_DATA(nlh);
@ -340,7 +340,7 @@ tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, unsigned long fh,
if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
goto rtattr_failure;
}
nlh->nlmsg_len = skb->tail - b;
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len;
nlmsg_failure:
@ -563,30 +563,30 @@ tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
* to work with both old and new modes of entering
* tc data even if iproute2 was newer - jhs
*/
struct rtattr * p_rta = (struct rtattr*) skb->tail;
struct rtattr *p_rta = (struct rtattr *)skb_tail_pointer(skb);
if (exts->action->type != TCA_OLD_COMPAT) {
RTA_PUT(skb, map->action, 0, NULL);
if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
goto rtattr_failure;
p_rta->rta_len = skb->tail - (u8*)p_rta;
p_rta->rta_len = skb_tail_pointer(skb) - (u8 *)p_rta;
} else if (map->police) {
RTA_PUT(skb, map->police, 0, NULL);
if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
goto rtattr_failure;
p_rta->rta_len = skb->tail - (u8*)p_rta;
p_rta->rta_len = skb_tail_pointer(skb) - (u8 *)p_rta;
}
}
#elif defined CONFIG_NET_CLS_POLICE
if (map->police && exts->police) {
struct rtattr * p_rta = (struct rtattr*) skb->tail;
struct rtattr *p_rta = (struct rtattr *)skb_tail_pointer(skb);
RTA_PUT(skb, map->police, 0, NULL);
if (tcf_police_dump(skb, exts->police) < 0)
goto rtattr_failure;
p_rta->rta_len = skb->tail - (u8*)p_rta;
p_rta->rta_len = skb_tail_pointer(skb) - (u8 *)p_rta;
}
#endif
return 0;