[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>
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David S. Miller
parent
be8bd86321
commit
27a884dc3c
@ -260,7 +260,7 @@ static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
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struct ipv6_opt_hdr *exthdr =
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(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
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const unsigned char *nh = skb_network_header(skb);
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unsigned int packet_len = skb->tail - nh;
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unsigned int packet_len = skb->tail - skb->network_header;
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int found_rhdr = 0;
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*nexthdr = &ipv6_hdr(skb)->nexthdr;
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@ -392,7 +392,7 @@ static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
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struct ipv6_opt_hdr *exthdr =
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(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
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const unsigned char *nh = skb_network_header(skb);
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unsigned int packet_len = skb->tail - nh;
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unsigned int packet_len = skb->tail - skb->network_header;
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int found_rhdr = 0;
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*nexthdr = &ipv6_hdr(skb)->nexthdr;
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