netdev - Re: RX/dropped counter values for tagged packets

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Date:	Sun, 31 Mar 2013 18:24:04 -0700
From:	Ani Sinha <linuxdev@...rban.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ani Sinha <ani@...stanetworks.com>, netdev@...r.kernel.org
Subject: Re: RX/dropped counter values for tagged packets

On Sat, Mar 30, 2013 at 10:44 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> I don't know, I am not reading this code like you, I see no problem.
>
> If vlan_do_receive() return true, we "goto another_round" to deliver the
> packt to vlan device.
>
> vlan_do_receive() doesn't deliver the packet at all. It only prepares
> the "another_round"


yes, I am with you on this. But let's focus on this "another_round" code.

>
> So if packet is delivered to vlan, we don't increment rx_dropped.

So in "another_round", if pt_prev is null at the end of the function
(not sure if this can actually happen in reality, but from the code it
looks like a possibility), the dropped counts will get incremented.


Does that make sense?

cheers,
ani
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