netdev - Re: [PATCH net-next] erspan: auto detect truncated packets.

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Message-Id: <20180430.114410.1341893433757519940.davem@davemloft.net>
Date:   Mon, 30 Apr 2018 11:44:10 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     u9012063@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] erspan: auto detect truncated packets.

From: William Tu <u9012063@...il.com>
Date: Fri, 27 Apr 2018 14:16:32 -0700

> Currently the truncated bit is set only when the mirrored packet
> is larger than mtu.  For certain cases, the packet might already
> been truncated before sending to the erspan tunnel.  In this case,
> the patch detect whether the IP header's total length is larger
> than the actual skb->len.  If true, this indicated that the
> mirrored packet is truncated and set the erspan truncate bit.
> 
> I tested the patch using bpf_skb_change_tail helper function to
> shrink the packet size and send to erspan tunnel.
> 
> Reported-by: Xiaoyan Jin <xiaoyanj@...are.com>
> Signed-off-by: William Tu <u9012063@...il.com>

Applied, thanks.