netdev - Re: [PATCH] net: Fix possible wrong checksum generation.

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Message-Id: <20130213.133107.1252368625820641730.davem@davemloft.net>
Date:	Wed, 13 Feb 2013 13:31:07 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	pshelar@...ira.com
Cc:	edumazet@...gle.com, netdev@...r.kernel.org, jesse@...ira.com,
	bhutchings@...arflare.com
Subject: Re: [PATCH] net: Fix possible wrong checksum generation.

From: Pravin B Shelar <pshelar@...ira.com>
Date: Mon, 11 Feb 2013 11:27:41 -0800

> Patch cef401de7be8c4e (net: fix possible wrong checksum
> generation) fixed wrong checksum calculation but it broke TSO by
> defining new GSO type but not a netdev feature for that type.
> net_gso_ok() would not allow hardware checksum/segmentation
> offload of such packets without the feature.
> 
> Following patch fixes TSO and wrong checksum. This patch uses
> same logic that Eric Dumazet used. Patch introduces new flag
> SKBTX_SHARED_FRAG if at least one frag can be modified by
> the user. but SKBTX_SHARED_FRAG flag is kept in skb shared
> info tx_flags rather than gso_type.
> 
> tx_flags is better compared to gso_type since we can have skb with
> shared frag without gso packet. It does not link SHARED_FRAG to
> GSO, So there is no need to define netdev feature for this.
> 
> Signed-off-by: Pravin B Shelar <pshelar@...ira.com>

Applied, thanks.
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