netdev - Re: [PATCH net-next] af_packet: Provide a TPACKET_V2 compatible Tx path for TPACKET

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Date:   Sat, 31 Dec 2016 07:21:38 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Willem de Bruijn <willemb@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next] af_packet: Provide a TPACKET_V2 compatible Tx
 path for TPACKET_V3

On (12/30/16 23:59), Willem de Bruijn wrote:
> > Actually I'm not averse to looking at extensions (or at least,
> > place-holders) to allow variable sized slots- do you have any
> > suggestions?
> 
> It is probably enough to just enforce that tp_next_offset is always
> sane. Either that it points to the start of the next packet, even
> though that currently can also be inferred from frame_size. Or, that
> it is always zero unless the ring is to be interpreted as holding
> variable sized frames. If the field is non-zero, drop the packet.

Ok, let me add this to patchv2, along with extra test cases.

--Sowmini