netdev - Re: [PATCH net-next 1/8] flow_keys: Record IP layer protocol in skb_flow

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Date:	Thu, 18 Sep 2014 07:38:00 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <or.gerlitz@...il.com>
Cc:	Govindarajulu Varadarajan <_govind@....com>,
	Yinghai Lu <yinghai@...nel.org>,
	David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>, ssujith@...co.com,
	gvaradar@...co.com, "Christian Benvenuti (benve)" <benve@...co.com>
Subject: Re: [PATCH net-next 1/8] flow_keys: Record IP layer protocol in
 skb_flow_dissect()

On Thu, 2014-09-18 at 17:18 +0300, Or Gerlitz wrote:

> The crash happens 100% on IPoIB (IP-over-Infiniband) [1] interfaces
> b/c your upstream commit e0f31d8 "flow_keys: Record IP layer protocol
> in skb_flow_dissect()" causes the IPoIB data stashed on skb->cb [2] to
> smash other skb fields.
> 
> So your 3.17-rc1 commit introduced a regression to how things work
> since kernel 3.2
> 
> Can please see how to revert this hunk
> 
> -- a/include/net/sch_generic.h
> +++ b/include/net/sch_generic.h
> @@ -231,7 +231,7 @@ struct qdisc_skb_cb {
>         unsigned int            pkt_len;
>         u16                     slave_dev_queue_mapping;
>         u16                     _pad;
> -       unsigned char           data[20];
> +       unsigned char           data[24];
>  };
> 
> thanks,
> 
> Or.
> 
> [1]  http://marc.info/?l=linux-rdma&m=141029109017035&w=2
> [2] see these commits
> 
> 936d7de3 IPoIB: Stop lying about hard_header_len and use skb->cb to
> stash LL addresses
> a0417fa3  net: Make qdisc_skb_cb upper size bound explicit

I am taking care of this right now guys.


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