netdev - RE: netif_needs

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Message-ID: <BAY121-W6E46148E896AA4607937CB6EA0@phx.gbl>
Date:	Wed, 16 Apr 2008 14:02:56 +0000
From:	Kostya B <bkostya@...mail.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>
Subject: RE: netif_needs_gso behavior



----------------------------------------
> Date: Wed, 16 Apr 2008 01:38:10 -0700
> To: bkostya@...mail.com
> CC: netdev@...r.kernel.org
> Subject: Re: netif_needs_gso behavior
> From: davem@...emloft.net
> 
> From: Kostya B 
> Date: Tue, 15 Apr 2008 16:52:20 +0000
> 
>> Please help me to understand why != CHECKSUM_PARTIAL packet requires gso? In the case of TCP it is ok, however UDP could be normally unchecked.
> 
> What exactly is the problem?  The UDP USO output paths set
> CHECKSUM_PARTIAL just like the TCP TSO ones do, so the test will pass
> for them.
> 
Not always, see udp4_hwcsum_outgoing()
In the case when socket queue contains several packets, the csum is reset.
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