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/act_api.c | 52 ++++++++++++++++++++++++++-------------------------- 1 file changed, 26 insertions(+), 26 deletions(-) (limited to 'net/sched/act_api.c') diff --git a/net/sched/act_api.c b/net/sched/act_api.c index cb21617a567..28326fb1fc4 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -93,7 +93,7 @@ static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, continue; a->priv = p; a->order = n_i; - r = (struct rtattr*) skb->tail; + r = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, a->order, 0, NULL); err = tcf_action_dump_1(skb, a, 0, 0); if (err < 0) { @@ -101,7 +101,7 @@ static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb, skb_trim(skb, (u8*)r - skb->data); goto done; } - r->rta_len = skb->tail - (u8*)r; + r->rta_len = skb_tail_pointer(skb) - (u8 *)r; n_i++; if (n_i >= TCA_ACT_MAX_PRIO) goto done; @@ -125,7 +125,7 @@ static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, struct rtattr *r ; int i= 0, n_i = 0; - r = (struct rtattr*) skb->tail; + r = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, a->order, 0, NULL); RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); for (i = 0; i < (hinfo->hmask + 1); i++) { @@ -140,7 +140,7 @@ static int tcf_del_walker(struct sk_buff *skb, struct tc_action *a, } } RTA_PUT(skb, TCA_FCNT, 4, &n_i); - r->rta_len = skb->tail - (u8*)r; + r->rta_len = skb_tail_pointer(skb) - (u8 *)r; return n_i; rtattr_failure: @@ -423,7 +423,7 @@ int tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) { int err = -EINVAL; - unsigned char *b = skb->tail; + unsigned char *b = skb_tail_pointer(skb); struct rtattr *r; if (a->ops == NULL || a->ops->dump == NULL) @@ -432,10 +432,10 @@ tcf_action_dump_1(struct sk_buff *skb, struct tc_action *a, int bind, int ref) RTA_PUT(skb, TCA_KIND, IFNAMSIZ, a->ops->kind); if (tcf_action_copy_stats(skb, a, 0)) goto rtattr_failure; - r = (struct rtattr*) skb->tail; + r = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, TCA_OPTIONS, 0, NULL); if ((err = tcf_action_dump_old(skb, a, bind, ref)) > 0) { - r->rta_len = skb->tail - (u8*)r; + r->rta_len = skb_tail_pointer(skb) - (u8 *)r; return err; } @@ -449,17 +449,17 @@ tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref) { struct tc_action *a; int err = -EINVAL; - unsigned char *b = skb->tail; + unsigned char *b = skb_tail_pointer(skb); struct rtattr *r ; while ((a = act) != NULL) { - r = (struct rtattr*) skb->tail; + r = (struct rtattr *)skb_tail_pointer(skb); act = a->next; RTA_PUT(skb, a->order, 0, NULL); err = tcf_action_dump_1(skb, a, bind, ref); if (err < 0) goto errout; - r->rta_len = skb->tail - (u8*)r; + r->rta_len = skb_tail_pointer(skb) - (u8 *)r; } return 0; @@ -635,7 +635,7 @@ tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, { struct tcamsg *t; struct nlmsghdr *nlh; - unsigned char *b = skb->tail; + unsigned char *b = skb_tail_pointer(skb); struct rtattr *x; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); @@ -645,15 +645,15 @@ tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 pid, u32 seq, t->tca__pad1 = 0; t->tca__pad2 = 0; - x = (struct rtattr*) skb->tail; + x = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); if (tcf_action_dump(skb, a, bind, ref) < 0) goto rtattr_failure; - x->rta_len = skb->tail - (u8*)x; + x->rta_len = skb_tail_pointer(skb) - (u8 *)x; - nlh->nlmsg_len = skb->tail - b; + nlh->nlmsg_len = skb_tail_pointer(skb) - b; return skb->len; rtattr_failure: @@ -767,7 +767,7 @@ static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) return -ENOBUFS; } - b = (unsigned char *)skb->tail; + b = skb_tail_pointer(skb); if (rtattr_parse_nested(tb, TCA_ACT_MAX, rta) < 0) goto err_out; @@ -783,16 +783,16 @@ static int tca_action_flush(struct rtattr *rta, struct nlmsghdr *n, u32 pid) t->tca__pad1 = 0; t->tca__pad2 = 0; - x = (struct rtattr *) skb->tail; + x = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); err = a->ops->walk(skb, &dcb, RTM_DELACTION, a); if (err < 0) goto rtattr_failure; - x->rta_len = skb->tail - (u8 *) x; + x->rta_len = skb_tail_pointer(skb) - (u8 *)x; - nlh->nlmsg_len = skb->tail - b; + nlh->nlmsg_len = skb_tail_pointer(skb) - b; nlh->nlmsg_flags |= NLM_F_ROOT; module_put(a->ops->owner); kfree(a); @@ -884,7 +884,7 @@ static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, if (!skb) return -ENOBUFS; - b = (unsigned char *)skb->tail; + b = skb_tail_pointer(skb); nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*t), flags); t = NLMSG_DATA(nlh); @@ -892,15 +892,15 @@ static int tcf_add_notify(struct tc_action *a, u32 pid, u32 seq, int event, t->tca__pad1 = 0; t->tca__pad2 = 0; - x = (struct rtattr*) skb->tail; + x = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); if (tcf_action_dump(skb, a, 0, 0) < 0) goto rtattr_failure; - x->rta_len = skb->tail - (u8*)x; + x->rta_len = skb_tail_pointer(skb) - (u8 *)x; - nlh->nlmsg_len = skb->tail - b; + nlh->nlmsg_len = skb_tail_pointer(skb) - b; NETLINK_CB(skb).dst_group = RTNLGRP_TC; err = rtnetlink_send(skb, pid, RTNLGRP_TC, flags&NLM_F_ECHO); @@ -1015,7 +1015,7 @@ static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) { struct nlmsghdr *nlh; - unsigned char *b = skb->tail; + unsigned char *b = skb_tail_pointer(skb); struct rtattr *x; struct tc_action_ops *a_o; struct tc_action a; @@ -1048,7 +1048,7 @@ tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) t->tca__pad1 = 0; t->tca__pad2 = 0; - x = (struct rtattr *) skb->tail; + x = (struct rtattr *)skb_tail_pointer(skb); RTA_PUT(skb, TCA_ACT_TAB, 0, NULL); ret = a_o->walk(skb, cb, RTM_GETACTION, &a); @@ -1056,12 +1056,12 @@ tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) goto rtattr_failure; if (ret > 0) { - x->rta_len = skb->tail - (u8 *) x; + x->rta_len = skb_tail_pointer(skb) - (u8 *)x; ret = skb->len; } else skb_trim(skb, (u8*)x - skb->data); - nlh->nlmsg_len = skb->tail - b; + nlh->nlmsg_len = skb_tail_pointer(skb) - b; if (NETLINK_CB(cb->skb).pid && ret) nlh->nlmsg_flags |= NLM_F_MULTI; module_put(a_o->owner); -- cgit v1.2.3