On Thu, Aug 26, 2010 at 06:26:58PM -0500, Christoph Lameter wrote:
> On Thu, 26 Aug 2010, Jason Gunthorpe wrote:
>
> > 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
>
> Ok but then we have no nice function that checks for multicast anymore.
Were you going to try it this way?
/* First byte of dgid signals multicast/broadcast when 0xff */
if ((wc->wc_flags & IB_WC_GRH) &&
((struct ib_grh *)skb->data)->dgid.raw[0] == 0xff) {
if (memcmp(((struct ib_grh *)skb->data)->dgid.raw,
dev->broadcast + 4, sizeof(union ib_gid)) == 0)
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_MULTICAST;
}
else
skb->pkt_type = PACKET_HOST;
I think doing the memcmp only in the multicast path should be
reasonable overhead wise.
Jason
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