netdev - Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

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Message-ID: <20130402221913.GG4924@order.stressinduktion.org>
Date:	Wed, 3 Apr 2013 00:19:13 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Huang, Xiong" <xiong@....qualcomm.com>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Anders Boström <anders@...insight.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"565404@...s.debian.org" <565404@...s.debian.org>
Subject: Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

On Tue, Apr 02, 2013 at 09:51:12PM +0000, Huang, Xiong wrote:
> > The error vanishes as soon as I put a gso size limit of MAX_TX_BUF_LEN in
> > the driver. MAX_TX_BUF_LEN seems to be arbitrary set to 0x2000. I can even
> > raise it to 0x3000 and don't see any tcp retransmits. Do you have an advice on
> > how to size this value (e.g. should we switch to the windows values)?
> > 
> 
> Would you try 0x4000 ? because the buffer-length in TX descriptor is 14bits, 0x4000 exceeds max value.
> Do you find any bug/issue on the code that calculate the length for each TX descriptor ?

Setting MAX_TX_BUF_LEN to 0x4000

[ 8949.833750] ATL1E 0000:04:00.0 p33p1: NIC Link is Up <100 Mbps Full Duplex>
[ 8949.833783] IPv6: ADDRCONF(NETDEV_CHANGE): p33p1: link becomes ready
[ 8960.861557] ATL1E 0000:04:00.0 p33p1: PCIE DMA RW error (status = 0x5000400)
[ 8960.866879] ATL1E 0000:04:00.0 p33p1: NIC Link is Up <100 Mbps Full Duplex>
[ 8961.095266] ATL1E 0000:04:00.0 p33p1: PCIE DMA RW error (status = 0x5000400)
[ 8961.100791] ATL1E 0000:04:00.0 p33p1: NIC Link is Up <100 Mbps Full Duplex>

I have not looked at the buffer calculations intensly.

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