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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-04-19 20:29:13 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:26:28 -0700
commit27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch)
tree5a267e40f9b94014be38dad5de0a52b6628834e0 /include/net
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
[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 <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/inet_ecn.h6
-rw-r--r--include/net/netlink.h8
-rw-r--r--include/net/pkt_cls.h2
3 files changed, 7 insertions, 9 deletions
diff --git a/include/net/inet_ecn.h b/include/net/inet_ecn.h
index 06a2c69a89e..de8399a7977 100644
--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -114,14 +114,12 @@ static inline int INET_ECN_set_ce(struct sk_buff *skb)
{
switch (skb->protocol) {
case __constant_htons(ETH_P_IP):
- if (skb_network_header(skb) + sizeof(struct iphdr) <=
- skb->tail)
+ if (skb->network_header + sizeof(struct iphdr) <= skb->tail)
return IP_ECN_set_ce(ip_hdr(skb));
break;
case __constant_htons(ETH_P_IPV6):
- if (skb_network_header(skb) + sizeof(struct ipv6hdr) <=
- skb->tail)
+ if (skb->network_header + sizeof(struct ipv6hdr) <= skb->tail)
return IP6_ECN_set_ce(ipv6_hdr(skb));
break;
}
diff --git a/include/net/netlink.h b/include/net/netlink.h
index bcaf67b7a19..2c7ab107f20 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -525,7 +525,7 @@ static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
*/
static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
{
- nlh->nlmsg_len = skb->tail - (unsigned char *) nlh;
+ nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
return skb->len;
}
@@ -538,7 +538,7 @@ static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
*/
static inline void *nlmsg_get_pos(struct sk_buff *skb)
{
- return skb->tail;
+ return skb_tail_pointer(skb);
}
/**
@@ -940,7 +940,7 @@ static inline unsigned long nla_get_msecs(struct nlattr *nla)
*/
static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
{
- struct nlattr *start = (struct nlattr *) skb->tail;
+ struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
if (nla_put(skb, attrtype, 0, NULL) < 0)
return NULL;
@@ -960,7 +960,7 @@ static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
*/
static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start)
{
- start->nla_len = skb->tail - (unsigned char *) start;
+ start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
return skb->len;
}
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index dcb3a91f136..4129df70807 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -337,7 +337,7 @@ static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
static inline int tcf_valid_offset(const struct sk_buff *skb,
const unsigned char *ptr, const int len)
{
- return unlikely((ptr + len) < skb->tail && ptr > skb->head);
+ return unlikely((ptr + len) < skb_tail_pointer(skb) && ptr > skb->head);
}
#ifdef CONFIG_NET_CLS_IND