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

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Date:	Thu, 26 Aug 2010 15:15:53 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	cl@...ux.com
Cc:	rdreier@...co.com, linux-rdma@...r.kernel.org,
	ogerlitz@...taire.com, jgunthorpe@...idianresearch.com,
	yosefe@...taire.com, netdev@...r.kernel.org
Subject: Re: [IPoIB] Identify multicast packets and fix IGMP breakage V2

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.

You'll need to parse the encapsulated protocol and process it as
ipv4 or ipv6 as needed.
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