netdev - Re: [Intel-wired-lan] [RFC v2 net-next 01/10] net: Add a new socket option for a future transmit time.

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Date:   Wed, 31 Jan 2018 16:49:36 -0800
From:   Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
To:     Richard Cochran <richardcochran@...il.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Cc:     netdev@...r.kernel.org, john.stultz@...aro.org,
        Richard Cochran <rcochran@...utronix.de>, jiri@...nulli.us,
        ivan.briano@...el.com, henrik@...tad.us, jhs@...atatu.com,
        levi.pearson@...man.com, intel-wired-lan@...ts.osuosl.org,
        xiyou.wangcong@...il.com, tglx@...utronix.de,
        anna-maria@...utronix.de
Subject: Re: [Intel-wired-lan] [RFC v2 net-next 01/10] net: Add a new socket
 option for a future transmit time.

Hi,


On 01/18/2018 09:13 AM, Richard Cochran wrote:
> On Thu, Jan 18, 2018 at 09:42:27AM +0100, Miroslav Lichvar wrote:
>> In the discussion about the v1 patchset, there was a question if the
>> cmsg should include a clockid_t. Without that, how can an application
>> prevent the packet from being sent using an incorrect clock, e.g.
>> the system clock when it expects it to be a PHC, or a different PHC
>> when the socket is not bound to a specific interface?
> 
> Right, the clockid_t should be passed in through the CMSG along with
> the time.

While implementing this today it crossed my mind that why don't we have the
clockid_t set per socket (e.g. as an argument to SO_TXTIME) instead of per packet?

The only use-case that we could think of that would be 'blocked' was using
sendmmsg() to send a packet to different interfaces with a single syscall, but
I'm not sure how common that is.

What do you think?

Thanks,
Jesus


>  
> Thanks,
> Richard
>