netdev - Re: [IPoIB] Identify multicast packets and fix IGMP breakage V2

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Date:	Thu, 26 Aug 2010 16:21:46 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	David Miller <davem@...emloft.net>
Cc:	cl@...ux.com, rdreier@...co.com, linux-rdma@...r.kernel.org,
	ogerlitz@...taire.com, yosefe@...taire.com, netdev@...r.kernel.org
Subject: Re: [IPoIB] Identify multicast packets and fix IGMP breakage V2

On Thu, Aug 26, 2010 at 03:15:53PM -0700, David Miller wrote:
> From: Christoph Lameter <cl@...ux.com>
> Date: Thu, 26 Aug 2010 16:31:14 -0500 (CDT)
> 
> > @@ -271,6 +271,13 @@ static void ipoib_ib_handle_rx_wc(struct
> >  	ipoib_ud_dma_unmap_rx(priv, mapping);
> >  	ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
> > 
> > +	if ((wc->wc_flags & IB_WC_GRH) &&
> > +		IN6_IS_ADDR_MULTICAST(&((struct ipv6hdr *)skb->data)->daddr))
> > +
> > +		skb->pkt_type = PACKET_MULTICAST;
> > +	else
> > +		skb->pkt_type = PACKET_HOST;
> 
> I really don't think you can assume there is an ipv6 header here
> at all.

The 40 bytes at this location are defined by the HW specification to
be an IB GRH which has an identical layout to an IPv6 header. Roland
is right, it would be clearer to use ib_grh ->dgid

Jason
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