linux-kernel - Re: [PATCH net-next] hv_netvsc: use skb_get_hash() instead of a homegrown implementation

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Message-Id: <20160125.105323.453007330881616541.davem@davemloft.net>
Date:	Mon, 25 Jan 2016 10:53:23 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	vkuznets@...hat.com
Cc:	netdev@...r.kernel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	eric.dumazet@...il.com, tom@...bertland.com,
	gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH net-next] hv_netvsc: use skb_get_hash() instead of a
 homegrown implementation

From: Vitaly Kuznetsov <vkuznets@...hat.com>
Date: Mon, 25 Jan 2016 16:00:41 +0100

> Recent changes to 'struct flow_keys' (e.g commit d34af823ff40 ("net: Add
> VLAN ID to flow_keys")) introduced a performance regression in netvsc
> driver. Is problem is, however, not the above mentioned commit but the
> fact that netvsc_set_hash() function did some assumptions on the struct
> flow_keys data layout and this is wrong.
> 
> Get rid of netvsc_set_hash() by switching to skb_get_hash(). This change
> will also imply switching to Jenkins hash from the currently used Toeplitz
> but it seems there is no good excuse for Toeplitz to stay.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Applied.