netdev - Re: [RFC v3 net-next 05/18] net: ipv4: raw: Hook into time based transmission.

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Date:   Wed, 7 Mar 2018 12:00:22 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiří Pírko <jiri@...nulli.us>,
        Vinicius Gomes <vinicius.gomes@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        intel-wired-lan@...ts.osuosl.org, anna-maria@...utronix.de,
        Henrik Austad <henrik@...tad.us>,
        Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>,
        Levi Pearson <levi.pearson@...man.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Richard Cochran <rcochran@...utronix.de>
Subject: Re: [RFC v3 net-next 05/18] net: ipv4: raw: Hook into time based transmission.

On Tue, Mar 6, 2018 at 8:12 PM, Jesus Sanchez-Palencia
<jesus.sanchez-palencia@...el.com> wrote:
> From: Richard Cochran <rcochran@...utronix.de>
>
> For raw packets, copy the desired future transmit time from the CMSG
> cookie into the skb.
>
> Signed-off-by: Richard Cochran <rcochran@...utronix.de>
> Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
> ---
>  net/ipv4/raw.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
> index 54648d20bf0f..8e05970ba7c4 100644
> --- a/net/ipv4/raw.c
> +++ b/net/ipv4/raw.c
> @@ -381,6 +381,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
>
>         skb->priority = sk->sk_priority;
>         skb->mark = sk->sk_mark;
> +       skb->tstamp = sockc->transmit_time;

This implements the feature only for the hdrincl case and silently
drops the txtime request on other raw sockets (incl. corked).

At the least, should probably fail if sockc.transmit_time is non-zero
and the hdrincl path is not taken. Or implement by passing through
inet_cork and set in __ip_make_skb. Then be careful to ignore the
field for other protocols, where it may be uninitialized.