netdev - Re: [PATCH net] net: usbnet: fix tx

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Message-Id: <20130204.130741.1626636131644599032.davem@davemloft.net>
Date:	Mon, 04 Feb 2013 13:07:41 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bjorn@...k.no
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	oliver@...kum.org, alexey.orishko@...il.com
Subject: Re: [PATCH net] net: usbnet: fix tx_dropped statistics

From: Bjørn Mork <bjorn@...k.no>
Date: Thu, 31 Jan 2013 19:36:05 +0100

> It is normal for minidrivers accumulating frames to return NULL
> from their tx_fixup function. We do not want to count this as a
> drop, or log any debug messages.  A different exit path is
> therefore chosen for such drivers, skipping the debug message
> and the tx_dropped increment.
> 
> The test for accumulating drivers was however completely bogus,
> making the exit path selection depend on whether the user had
> enabled tx_err logging or not. This would arbitrarily mess up
> accounting for both accumulating and non-accumulating minidrivers,
> and would result in unwanted debug messages for the accumulating
> drivers.
> 
> Fix by testing for FLAG_MULTI_PACKET instead, which probably was
> the intention from the beginning.  This usage match the documented
> behaviour of this flag:
> 
>  Indicates to usbnet, that USB driver accumulates multiple IP packets.
>  Affects statistic (counters) and short packet handling.
> 
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied.
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