netdev - Re: [RFC net-next PATCH 2/5] mlx5: fix bug reading rss_hash

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Message-Id: <20170519.193818.1096111302686413939.davem@davemloft.net>
Date:   Fri, 19 May 2017 19:38:18 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     borkmann@...earbox.net, alexei.starovoitov@...il.com,
        john.r.fastabend@...el.com, netdev@...r.kernel.org
Subject: Re: [RFC net-next PATCH 2/5] mlx5: fix bug reading rss_hash_type
 from CQE

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Thu, 18 May 2017 17:41:38 +0200

> Masks for extracting part of the Completion Queue Entry (CQE)
> field rss_hash_type was swapped, namely CQE_RSS_HTYPE_IP and
> CQE_RSS_HTYPE_L4.
> 
> The bug resulted in setting skb->l4_hash, even-though the
> rss_hash_type indicated that hash was NOT computed over the
> L4 (UDP or TCP) part of the packet.
> 
> Added comments from the datasheet, to make it more clear what
> these masks are selecting.
> 
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Please pass this along to the mlx5 developers as a standalone
bug fix for 'net', thank you.