netdev - Re: [PATCH net-next 4/8] sock: accept SO_TIMESTAMPING flags in socket cmsg

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Date:	Wed, 30 Mar 2016 23:36:30 -0400
From:	Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:	Soheil Hassas Yeganeh <soheil.kdev@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>,
	Willem de Bruijn <willemb@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Martin KaFai Lau <kafai@...com>,
	Soheil Hassas Yeganeh <soheil@...gle.com>
Subject: Re: [PATCH net-next 4/8] sock: accept SO_TIMESTAMPING flags in socket cmsg

On Wed, Mar 30, 2016 at 6:37 PM, Soheil Hassas Yeganeh
<soheil.kdev@...il.com> wrote:
> From: Soheil Hassas Yeganeh <soheil@...gle.com>
>
> Accept SO_TIMESTAMPING in control messages of the SOL_SOCKET level
> as a basis to accept timestamping requests per write.
>
> This implementation only accepts TX recording flags (i.e.,
> SOF_TIMESTAMPING_TX_HARDWARE, SOF_TIMESTAMPING_TX_SOFTWARE,
> SOF_TIMESTAMPING_TX_SCHED, and SOF_TIMESTAMPING_TX_ACK) in
> control messages. Users need to set reporting flags (e.g.,
> SOF_TIMESTAMPING_OPT_ID) per socket via socket options.
>
> This commit adds a tsflags field in sockcm_cookie which is
> set in __sock_cmsg_send. It only override the SOF_TIMESTAMPING_TX_*
> bits in sockcm_cookie.tsflags allowing the control message
> to override the recording behavior per write, yet maintaining
> the value of other flags.
>
> This patch implements validating the control message and setting
> tsflags in struct sockcm_cookie. Next commits in this series will
> actually implement timestamping per write for different protocols.
>
> Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>

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