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

To: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Ben Hutchings <ben@decadent.org.uk>, Anders Boström <anders@netinsight.net>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, "565404@bugs.debian.org" <565404@bugs.debian.org>
Subject: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken
From: "Huang, Xiong" <xiong@qca.qualcomm.com>
Date: Tue, 2 Apr 2013 21:51:12 +0000
Message-id: <[🔎] 157393863283F442885425D2C45428564F202AD5@nasanexd02f.na.qualcomm.com>
Reply-to: "Huang, Xiong" <xiong@qca.qualcomm.com>, 565404@bugs.debian.org
In-reply-to: <[🔎] 20130402211524.GE4924@order.stressinduktion.org>
References: <CDAFEDABF718A54BABD0DA5476695307475CCD42@SHEXMB-01.global.atheros.com> <20100125.163612.582489483209420341.anders@netinsight.net> <CDAFEDABF718A54BABD0DA5476695307475CCFF8@SHEXMB-01.global.atheros.com> <20100126.093439.651115405791675606.anders@netinsight.net> <1364689558.3557.22.camel@deadeye.wl.decadent.org.uk> <157393863283F442885425D2C45428564F202477@nasanexd02f.na.qualcomm.com> <1364695805.3557.41.camel@deadeye.wl.decadent.org.uk> <[🔎] 157393863283F442885425D2C45428564F20261B@nasanexd02f.na.qualcomm.com> <[🔎] 20130402211524.GE4924@order.stressinduktion.org>

> 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 ?

Thanks
Xiong

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Follow-Ups:
- Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken
  - From: Hannes Frederic Sowa <hannes@stressinduktion.org>

References:
- Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken
  - From: "Huang, Xiong" <xiong@qca.qualcomm.com>
- Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken
  - From: Hannes Frederic Sowa <hannes@stressinduktion.org>

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