netdev - Re: [PATCH] net: Fix too optimistic NETIF_F_HW

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Date:	Tue, 30 Nov 2010 17:18:31 +0100
From:	MichałMirosław <mirq-linux@...e.qmqm.pl>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org, Jesse Gross <jesse@...ira.com>
Subject: Re: [PATCH] net: Fix too optimistic NETIF_F_HW_CSUM features

On Tue, Nov 30, 2010 at 03:51:58PM +0000, Ben Hutchings wrote:
> > > Why are you disabling IPv6 checksum offload?  From a quick look at the
> > > driver, I think the hardware does support it.
> > 
> > In vxge_xmit() (at drivers/net/vxge/vxge-main.c:922 in net-next) there
> > is the following code, that suggested otherwise:
> > 
> >         if (skb->ip_summed == CHECKSUM_PARTIAL)
> >                 vxge_hw_fifo_txdl_cksum_set_bits(dtr,
> >                                         VXGE_HW_FIFO_TXD_TX_CKO_IPV4_EN |
> >                                         VXGE_HW_FIFO_TXD_TX_CKO_TCP_EN |
> >                                         VXGE_HW_FIFO_TXD_TX_CKO_UDP_EN);
> 
> I bet IPV4_EN refers to the IPv4 header checksum.  Since IPv6 doesn't
> have a header checksum, there won't be a flag for it here.

That makes sense. I'll fix that.

Thanks,
Michał Mirosław
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