To: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Stephen Hemminger <shemminger@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       netdev@vger.kernel.org, openib-general@openib.org,
       Roland Dreier <rolandd@cisco.com>,
       "David S. Miller" <davem@davemloft.net>
Subject: Re: Dropping NETIF_F_SG since no checksum feature.
References: <20061010104315.61540986@freekitty>
	<20061011001338.GA30093@mellanox.co.il>
From: Roland Dreier <rdreier@cisco.com>
Date: Tue, 10 Oct 2006 17:15:26 -0700
In-Reply-To: <20061011001338.GA30093@mellanox.co.il> (Michael S. Tsirkin's message of "Wed, 11 Oct 2006 02:13:38 +0200")
Message-ID: <adavemrbtcx.fsf@cisco.com>
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    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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