netdev - Netxen packet loss with VLANs and LRO (was: [PATCH] netxen: fix LRO disable warning)

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Message-ID: <20110403190555.GA16196@torres.zugschlus.de>
Date:	Sun, 3 Apr 2011 21:05:55 +0200
From:	Marc Haber <mh+netdev@...schlus.de>
To:	Amit Kumar Salecha <amit.salecha@...gic.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	ameen.rahman@...gic.com,
	Rajesh Borundia <rajesh.borundia@...gic.com>
Subject: Netxen packet loss with VLANs and LRO (was: [PATCH] netxen:  fix
	LRO disable warning)

Hi,

On Mon, Mar 21, 2011 at 03:37:08AM -0700, Amit Kumar Salecha wrote:
> netxen_nic_set_flags() rejects data if other flag than ETH_FLAG_LRO is set.
> Driver also supports NETIF_F_HW_VLAN_TX.
> Now compare data with ethtool_op_get_flags(), to get all supported features.

Could that be the cause for packet loss on kernel 2.6.38.2 if:

  - receiving card is NX3031 [4040:0100]
  - frames are received with VLAN tags
  - large received offload is on.

Packet Loss of this kind is noticed when doing TCP data transfers
towards the host with the Netxen Interface and the TCP session is
terminated on the Netxen host itself. TCP sessions routed through the
Netxen host are not affected.

My ethtool doesn't allow me to influence the LRO setting alone - it is
disabled when I set rx off but doesn't come on again when rx is set to
on again. So, ethtool -K rx off, ethtool -K rx on fixes the issue.

Is this a known bug, maybe with an available patch?

Greetings
Marc

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