netdev - Re: [PATCH net] tg3: update rx_jumbo_pending ring param only when jumbo frames are enabled

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Date:	Fri, 18 Apr 2014 18:01:51 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ivecera@...hat.com
Cc:	netdev@...r.kernel.org, mchan@...adcom.com
Subject: Re: [PATCH net] tg3: update rx_jumbo_pending ring param only when
 jumbo frames are enabled

From: Ivan Vecera <ivecera@...hat.com>
Date: Thu, 17 Apr 2014 14:51:08 +0200

> The patch fixes a problem with dropped jumbo frames after usage of
> 'ethtool -G ... rx'.
> 
> Scenario:
> 1. ip link set eth0 up
> 2. ethtool -G eth0 rx N # <- This zeroes rx-jumbo
> 3. ip link set mtu 9000 dev eth0
> 
> The ethtool command set rx_jumbo_pending to zero so any received jumbo
> packets are dropped and you need to use 'ethtool -G eth0 rx-jumbo N'
> to workaround the issue.
> The patch changes the logic so rx_jumbo_pending value is changed only if
> jumbo frames are enabled (MTU > 1500).
> 
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>

Applied and queued up for -stable.
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