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Date: Tue, 25 Mar 2008 14:41:51 -0400 From: Hideo AOKI <haoki@...hat.com> To: netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>, Herbert Xu <herbert@...dor.apana.org.au> Subject: [RFC PATCH] [NET] [2/2] pskb_expand_head() updates truesize This patch revises pskb_expand_head() to update truesize. Applying this change, caller functions don't have to update truesize by themselves. Moreover, skb can keep correct truesize even if allocation size is aligned in pskb_expand_head(). This patch also removes updating truesize in callers since the update doesn't need anymore. [Note: Updating truesize in audit_expand() is fixed by anther patch.] Signed-off-by: Hideo Aoki <haoki@...hat.com> --- core/skbuff.c | 6 ++++++ ipv4/ipcomp.c | 1 - ipv6/ipcomp6.c | 1 - netlink/af_netlink.c | 3 +-- 4 files changed, 7 insertions(+), 4 deletions(-) diff -pruN net-2.6-mod-p1/net/core/skbuff.c net-2.6-mod-p2/net/core/skbuff.c --- net-2.6-mod-p1/net/core/skbuff.c 2008-02-25 09:05:46.000000000 -0500 +++ net-2.6-mod-p2/net/core/skbuff.c 2008-03-24 14:22:55.000000000 -0400 @@ -701,6 +701,12 @@ int pskb_expand_head(struct sk_buff *skb skb_release_data(skb); +#ifdef NET_SKBUFF_DATA_USES_OFFSET + skb->truesize += (size - skb->end); +#else + skb->truesize += (size - (skb->end - skb->head)); +#endif + off = (data + nhead) - skb->head; skb->head = data; diff -pruN net-2.6-mod-p1/net/ipv4/ipcomp.c net-2.6-mod-p2/net/ipv4/ipcomp.c --- net-2.6-mod-p1/net/ipv4/ipcomp.c 2008-03-05 05:12:30.000000000 -0500 +++ net-2.6-mod-p2/net/ipv4/ipcomp.c 2008-03-24 14:25:47.000000000 -0400 @@ -64,7 +64,6 @@ static int ipcomp_decompress(struct xfrm if (err) goto out; - skb->truesize += dlen - plen; __skb_put(skb, dlen - plen); skb_copy_to_linear_data(skb, scratch, dlen); out: diff -pruN net-2.6-mod-p1/net/ipv6/ipcomp6.c net-2.6-mod-p2/net/ipv6/ipcomp6.c --- net-2.6-mod-p1/net/ipv6/ipcomp6.c 2008-03-05 05:12:30.000000000 -0500 +++ net-2.6-mod-p2/net/ipv6/ipcomp6.c 2008-03-24 14:22:55.000000000 -0400 @@ -108,7 +108,6 @@ static int ipcomp6_input(struct xfrm_sta goto out_put_cpu; } - skb->truesize += dlen - plen; __skb_put(skb, dlen - plen); skb_copy_to_linear_data(skb, scratch, dlen); err = nexthdr; diff -pruN net-2.6-mod-p1/net/netlink/af_netlink.c net-2.6-mod-p2/net/netlink/af_netlink.c --- net-2.6-mod-p1/net/netlink/af_netlink.c 2008-02-05 12:00:28.000000000 -0500 +++ net-2.6-mod-p2/net/netlink/af_netlink.c 2008-03-24 14:22:55.000000000 -0400 @@ -835,8 +835,7 @@ static inline struct sk_buff *netlink_tr skb = nskb; } - if (!pskb_expand_head(skb, 0, -delta, allocation)) - skb->truesize -= delta; + pskb_expand_head(skb, 0, -delta, allocation); return skb; } -- Hitachi Computer Products (America) Inc. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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