netdev - Re: [PATCH v3 net-next 1/2] af_packet: TX_RING support for TPACKET

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Message-ID: <CAF=yD-L2b_x_tSt6ArjYqyvnM0FEz9gyBvbhPLUEqqZXtMpX-g@mail.gmail.com>
Date:   Tue, 3 Jan 2017 10:57:23 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.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 v3 net-next 1/2] af_packet: TX_RING support for TPACKET_V3

On Tue, Jan 3, 2017 at 9:31 AM, Sowmini Varadhan
<sowmini.varadhan@...cle.com> wrote:
> Although TPACKET_V3 Rx has some benefits over TPACKET_V2 Rx, *_v3
> does not currently have TX_RING support. As a result an application
> that wants the best perf for Tx and Rx (e.g. to handle request/response
> transacations) ends up needing 2 sockets, one with *_v2 for Tx and
> another with *_v3 for Rx.
>
> This patch enables TPACKET_V2 compatible Tx features in TPACKET_V3
> so that an application can use a single descriptor to get the benefits
> of _v3 RX_RING and _v2 TX_RING. An application may do a block-send by
> first filling up multiple frames in the Tx ring and then triggering a
> transmit. This patch only support fixed size Tx frames for TPACKET_V3,
> and requires that tp_next_offset must be zero.
>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>