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

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Message-ID: <157393863283F442885425D2C45428564F202AD5@nasanexd02f.na.qualcomm.com>
Date:	Tue, 2 Apr 2013 21:51:12 +0000
From:	"Huang, Xiong" <xiong@....qualcomm.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
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

> 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