linux-kernel - Re: Dropping NETIF_F_SG since no checksum feature.

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Message-ID: <adavemrbtcx.fsf@cisco.com>
Date:	Tue, 10 Oct 2006 17:15:26 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
Cc:	Stephen Hemminger <shemminger@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, openib-general@...nib.org,
	Roland Dreier <rolandd@...co.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: Dropping NETIF_F_SG since no checksum feature.

    Michael> Maybe I can patch linux to allow SG without checksum?
    Michael> Dave, maybe you could drop a hint or two on whether this
    Michael> is worthwhile and what are the issues that need
    Michael> addressing to make this work?

What do you really gain by allowing SG without checksum?  Someone has
to do the checksum anyway, so I don't see that much difference between
doing it in the networking core before passing the data to/from the
driver, or down in the driver itself.

 - R.
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