netdev - Re: [PATCH net-next V2] gro: introduce gro_mac_header

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Date:	Mon, 6 Feb 2012 11:59:15 -0800
From:	Roland Dreier <roland@...nel.org>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, ogerlitz@...lanox.com,
	sean.hefty@...el.com, herbert@...dor.hengli.com.au,
	linux-rdma@...r.kernel.org, shlomop@...lanox.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next V2] gro: introduce gro_mac_header_len

> Actually there is a way to make this work.
>
> Define your ipoib_skb_cb something like:
>
> struct ipoib_skb_cb {
>        struct qdisc_skb_cb     qdisc_cb;
>
>        ... ipoib stuff goes here ...
> };
>
> That way you can use the SKB cb area for your ipoib info
> without interfering with the packet scheduler.

Not sure I see how this could work.  sch_generic.h has:

struct qdisc_skb_cb {
        unsigned int            pkt_len;
        long                    data[];
};

and ipoib has no way of knowing what the biggest
scheduler-specific use of data[] will be.
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