From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steffen Klassert <steffen.klassert@secunet.com>
Subject: Re: [PATCHv3 net-next 2/5] {IPv4,xfrm} Add ESN support for AH
 ingress part
Date: Tue, 14 Jan 2014 11:09:00 +0100
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Cc: davem@davemloft.net, netdev@vger.kernel.org
To: Fan Du <fan.du@windriver.com>
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On Tue, Jan 14, 2014 at 06:01:32PM +0800, Fan Du wrote:
>=20
>=20
> On 2014=E5=B9=B401=E6=9C=8814=E6=97=A5 17:54, Steffen Klassert wrote:
> >On Tue, Jan 14, 2014 at 09:39:09AM +0800, Fan Du wrote:
> >>@@ -381,7 +393,14 @@ static int ah_input(struct xfrm_state *x, stru=
ct sk_buff *skb)
> >>  	sg_init_table(sg, nfrags);
> >>  	skb_to_sgvec(skb, sg, 0, skb->len);
> >>
> >>-	ahash_request_set_crypt(req, sg, icv, skb->len);
> >>+	if (x->props.flags&  XFRM_STATE_ESN) {
> >>+		sg_unmark_end(&sg[nfrags - 1]);
> >>+		/* Attach seqhi sg right after packet payload */
> >>+		*seqhi =3D htonl(XFRM_SKB_CB(skb)->seq.output.hi);
> >
> >This is ah_input(), so you should use the high bits of the input
> >sequence number here. The ipv6 patch has the same problem.
>=20
> ok, I will fix this.
>=20
> >
> >>+		sg_init_table(seqhisg, sglists);
> >
> >Why do you add a separate SG table for this?
>=20
> It just initialize a single seqhisg, which is actually followed behin=
d packet payload sg table.
> initialized seqhisg actually mark itself as the end of sg list.
>=20

Why don't you just add this entry to the existing SG table?