On Wed, 2014-03-05 at 14:49 +0800, Hayes Wang wrote:
> Support hw IPv6 checksum for TCP and UDP packets.
>
> Note that the hw has the limitation of the range of the transport
> offset. Besides, the TCP Pseudo Header of the IPv6 TSO of the hw
> bases on the Microsoft document which excludes the packet length.
>
> Signed-off-by: Hayes Wang <hayeswang@xxxxxxxxxxx>
> ---
> drivers/net/usb/r8152.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 104 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 8f6d0f8..8e208f30 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
[...]
> +static int msdn_giant_send_check(struct sk_buff *skb)
> +{
> + const struct ipv6hdr *ipv6h;
> + struct tcphdr *th;
> +
> + ipv6h = ipv6_hdr(skb);
> + th = tcp_hdr(skb);
> +
> + th->check = 0;
> + th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
[...]
I think you need to call skb_cow_head() before editing the header here.
Ben.
--
Ben Hutchings
I say we take off; nuke the site from orbit. It's the only way to be sure.
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