linux-kernel - Re: [PATCH 1/4] pch_gbe: Fix transmit queue management

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Message-ID: <1386001999.5352.51.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 02 Dec 2013 08:33:19 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	David.Laight@...LAB.COM, puzman@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] pch_gbe: Fix transmit queue management

On Mon, 2013-12-02 at 11:16 -0500, David Miller wrote:

> Fragment lists are not to be found in the transmit function of the
> driver.  Any such SKBs will be linearized or similar first.  We do
> want to support them in some capacity in the future, but right now
> we don't.

Right. Such skb are segmented before reaching the driver, unless driver
asserts NETIF_F_FRAGLIST.

So far, only virtual drivers and 2 or 3 others advertise
NETIF_F_FRAGLIST 'support'.

I suspect that the '2 or 3 others' are plain bugs, I'll check this.


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