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

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Message-ID: <CAOQZsUhi_PELddHQ66EOk-_pZWev7f1Ohj8f-PvFKcDuQgEL=A@mail.gmail.com>
Date:	Sun, 31 Mar 2013 21:44:24 -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 Sun, Mar 31, 2013 at 8:43 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Sun, 2013-03-31 at 20:17 -0700, Ani Sinha wrote:
>
>> Correct. Now if you combine the two cases, we increment the rx count
>> for tagged packets in  vlan_do_receive() and then in "another_round",
>> if pt_prev is null, we also increment the rx_dropped.
>>
>
> Thats the way its done in a NIC driver.
>
> We increment rx_{bytes|packets} counters before giving the packet to the
> upper stack.
>
> Then the stack might drop the packet and increment rx_dropped.
>

thanks for the clarification. So basically what this means is that
from the numbers reported by ifconfig for example, rx-dropped is the
true rx value.
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