From 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Thu, 19 Apr 2007 20:29:13 -0700 Subject: [SK_BUFF]: Convert skb->tail to sk_buff_data_t 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 Signed-off-by: David S. Miller --- net/sched/cls_api.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'net/sched/cls_api.c') diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 5c6ffdb77d2..84231baf77d 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -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; -- cgit v1.2.3