From: Ivan Vecera <ivecera@redhat.com>
Date: Thu, 17 Apr 2014 12:51:08 +0000 (+0200)
Subject: tg3: update rx_jumbo_pending ring param only when jumbo frames are enabled
X-Git-Tag: omap-for-v3.16/pm-signed~76^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba67b510035141bd89b40bf65efa0a79834311ca;p=pandora-kernel.git

tg3: update rx_jumbo_pending ring param only when jumbo frames are enabled

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@redhat.com>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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