netdev - Re: [PATCH] loopback: packet drops accounting

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Message-Id: <20090417.015914.09817926.davem@davemloft.net>
Date:	Fri, 17 Apr 2009 01:59:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] loopback: packet drops accounting

From: Eric Dumazet <dada1@...mosbay.com>
Date: Fri, 17 Apr 2009 10:56:57 +0200

> We can in some situations drop packets in netif_rx()
> 
> loopback driver does not report these (unlikely) drops to its stats,
> and incorrectly change packets/bytes counts.
> 
> After this patch applied, "ifconfig lo" can reports these drops as in :
> 
> # ifconfig lo
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:692562900 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:692562900 errors:3228 dropped:3228 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:2865674174 (2.6 GiB)  TX bytes:2865674174 (2.6 GiB)
> 
> I chose to reflect those errors only in tx_dropped/tx_errors, and not mirror
> these errors in rx_dropped/rx_errors.
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Well, logically the receive is what failed, not the transmit.

I think it's therefore misleading to count it as a TX drop.

Do you feel strongly about this?
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