On Thu, 2013-04-11 at 08:58 +0100, Jason Wang wrote:
> On 04/11/2013 03:46 PM, Ian Campbell wrote:
> > On Thu, 2013-04-11 at 07:35 +0100, Jason Wang wrote:
> >> Switch to use skb_partial_csum_set() to simplify the codes.
> > This is incremental on top of your previous patch, right?
>
> It's an independent patch, since the previous patch has been applied.
> >> Cc: Ian Campbell <ian.campb...@citrix.com>
> >> Signed-off-by: Jason Wang <jasow...@redhat.com>
> >> ---
> >> Note:
> >> - Compile test only.
> >> ---
> >> drivers/net/xen-netback/netback.c | 22 ++++++++--------------
> >> 1 files changed, 8 insertions(+), 14 deletions(-)
> >>
> >> diff --git a/drivers/net/xen-netback/netback.c
> >> b/drivers/net/xen-netback/netback.c
> >> index 83905a9..70631f0 100644
> >> --- a/drivers/net/xen-netback/netback.c
> >> +++ b/drivers/net/xen-netback/netback.c
> >> @@ -1156,7 +1156,6 @@ static int netbk_set_skb_gso(struct xenvif *vif,
> >> static int checksum_setup(struct xenvif *vif, struct sk_buff *skb)
> >> {
> >> struct iphdr *iph;
> >> - unsigned char *th;
> >> int err = -EPROTO;
> >> int recalculate_partial_csum = 0;
> >>
> >> @@ -1180,28 +1179,26 @@ static int checksum_setup(struct xenvif *vif,
> >> struct sk_buff *skb)
> >> goto out;
> >>
> >> iph = (void *)skb->data;
> >> - th = skb->data + 4 * iph->ihl;
> >> - if (th >= skb_tail_pointer(skb))
> >> - goto out;
> >> -
> >> - skb_set_transport_header(skb, 4 * iph->ihl);
> > Is removing this line really correct?
>
> After commit e5d5deca (net: core: let skb_partial_csum_set() set
> transport header), this work was done by skb_partial_csum_set().
Ah, my working tree must be out of date, thanks.
> >
> >> - skb->csum_start = th - skb->head;
> >> switch (iph->protocol) {
> >> case IPPROTO_TCP:
> >> - skb->csum_offset = offsetof(struct tcphdr, check);
> >> + if (!skb_partial_csum_set(skb, 4 * iph->ihl,
> >> + offsetof(struct tcphdr, check)))
> >> + goto out;
> >>
> >> if (recalculate_partial_csum) {
> >> - struct tcphdr *tcph = (struct tcphdr *)th;
> >> + struct tcphdr *tcph = tcp_hdr(skb);
> >> tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
> >> skb->len - iph->ihl*4,
> >> IPPROTO_TCP, 0);
> >> }
> >> break;
> >> case IPPROTO_UDP:
> >> - skb->csum_offset = offsetof(struct udphdr, check);
> >> + if (!skb_partial_csum_set(skb, 4 * iph->ihl,
> >> + offsetof(struct udphdr, check)))
> >> + goto out;
> >>
> >> if (recalculate_partial_csum) {
> >> - struct udphdr *udph = (struct udphdr *)th;
> >> + struct udphdr *udph = udp_hdr(skb);
> >> udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
> >> skb->len - iph->ihl*4,
> >> IPPROTO_UDP, 0);
> >> @@ -1215,9 +1212,6 @@ static int checksum_setup(struct xenvif *vif, struct
> >> sk_buff *skb)
> >> goto out;
> >> }
> >>
> >> - if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb))
> >> - goto out;
> >> -
> >> err = 0;
> >>
> >> out:
> >
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
