netdev - GSO / TSO offload dependency

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Message-ID: <de0a9dcb1002280900k728b241fyd72112defc0336ea@mail.gmail.com>
Date:	Sun, 28 Feb 2010 22:30:24 +0530
From:	raj ravi <mekaviraj@...il.com>
To:	netdev@...r.kernel.org
Subject: GSO / TSO offload dependency

Hi,
I m currently working on TSO feature in Linux network driver.

Please correct my understanding.

GSO - Generic segmentation offload - does not require any hardware support.

TSO - TCP segmentation offload  - does require hardward support

Does TSO needs GSO to be turned on?  OR in other words,  can I have
GSO disabled and TSO Enabled ?
I beleive the code is tied between both offload...but not sure about
the above possibility... please clarify.

Just before handing over the packets to the Network driver,
segmentation is carried out a call to dev_gso_segment ( ) function.
Given GSO is enabled, It will take care about creating TCP and other
protocol  segments  too,  even if TSO is disabled.. ..correct ?

If hardware supports TSO, and  If TSO and GSO are both enabled, ...
what will happen to segmentation assembly by means of GSO ...
GSO will not do any segmentatoin assembly for TCP alone and will do
for other protocols ??  bit confused here? Please clarify.

Thx!
Kavi
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