netdev - Re: InfiniBand/RDMA merge plans for 2.6.24

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Message-ID: <OF9591AF85.09F0D1BF-ON87257369.006651BA-88257369.0066A0BD@us.ibm.com>
Date:	Wed, 3 Oct 2007 11:43:40 -0700
From:	Shirley Ma <xma@...ibm.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	general@...ts.openfabrics.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: InfiniBand/RDMA merge plans for 2.6.24

Roland Dreier <rdreier@...co.com> wrote on 09/17/2007 02:47:42 PM:

>  > > IPoIB CM handles this properly by gathering together single pages 
in
>  > > skbs' fragment lists.
> 
>  > Then can we reuse IPoIB CM code here?
> 
> Yes, if possible, refactoring things so that the rx skb allocation
> code becomes common between CM and non-CM would definitely make sense.

IPoIB-CM rx skb allocation is not generic to be used by UD, it allocates 
more buffers than needed if mtu is not 64K, and doesn't query the real 
max_num_sg from the device. I am thinking to have a generic skb allocation 
in IPoIB based on matrix of (ipoib-mtu-size, page-size, max_num_sg, 
head-size).

Thanks
Shirley 
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