netdev - Re: [PATCH net-next RFC 00/10] socket sendmsg MSG

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Date:	Thu, 20 Aug 2015 22:17:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	willemb@...gle.com
Cc:	netdev@...r.kernel.org, mst@...hat.com, jasowang@...hat.com
Subject: Re: [PATCH net-next RFC 00/10] socket sendmsg MSG_ZEROCOPY

From: Willem de Bruijn <willemb@...gle.com>
Date: Thu, 20 Aug 2015 22:49:25 -0400

> But there may still be others. Most obvious use case for copy
> avoidance is pure device transmit. Excluding loopback may be
> a reasonable way to initially limit the attack surface. With a flag
> NETIF_F_ZC not supported on lo.

Good luck avoiding every case where a packet can be looped back into
the machine in some way.  A simple device flag is not going to do it.
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