linux-kernel - Re: [PATCH] tun: make tun_build

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Message-Id: <20170816.142752.600537690273356198.davem@davemloft.net>
Date:   Wed, 16 Aug 2017 14:27:52 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        mst@...hat.com, eric.dumazet@...il.com
Subject: Re: [PATCH] tun: make tun_build_skb() thread safe

From: Jason Wang <jasowang@...hat.com>
Date: Wed, 16 Aug 2017 22:14:33 +0800

> From: Eric Dumazet <eric.dumazet@...il.com>
> 
> tun_build_skb() is not thread safe since it uses per queue page frag,
> this will break things when multiple threads are sending through same
> queue. Switch to use per-thread generator (no lock involved).
> 
> Fixes: 66ccbc9c87c2 ("tap: use build_skb() for small packet")
> Tested-by: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied, thanks.