netdev - Re: [PATCH net] net: sched: shrink struct qdisc_skb

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Date:	Mon, 22 Sep 2014 14:22:00 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	or.gerlitz@...il.com, _govind@....com, yinghai@...nel.org,
	netdev@...r.kernel.org, ssujith@...co.com, gvaradar@...co.com,
	benve@...co.com
Subject: Re: [PATCH net] net: sched: shrink struct qdisc_skb_cb to 28 bytes

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 18 Sep 2014 08:02:05 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> We cannot make struct qdisc_skb_cb bigger without impacting IPoIB,
> or increasing skb->cb[] size.
> 
> Commit e0f31d849867 ("flow_keys: Record IP layer protocol in
> skb_flow_dissect()") broke IPoIB.
> 
> Only current offender is sch_choke, and this one do not need an
> absolutely precise flow key.
> 
> If we store 17 bytes of flow key, its more than enough. (Its the actual
> size of flow_keys if it was a packed structure, but we might add new
> fields at the end of it later)
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Fixes: e0f31d849867 ("flow_keys: Record IP layer protocol in skb_flow_dissect()")

Applied, thanks Eric.
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