netdev - Re: [PATCH net-next RFC 1/5] net-timestamp: no-payload option

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Message-ID: <CA+FuTSf4SqTuLmrJ971Wu3eaqc94qd93M_OCa9QCCDHOYwxF8A@mail.gmail.com>
Date:	Fri, 9 Jan 2015 14:47:57 -0500
From:	Willem de Bruijn <willemb@...gle.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Network Development <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Richard Cochran <richardcochran@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next RFC 1/5] net-timestamp: no-payload option

On Fri, Jan 9, 2015 at 2:43 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Fri, Jan 9, 2015 at 9:31 AM, Willem de Bruijn <willemb@...gle.com> wrote:
>> From: Willem de Bruijn <willemb@...gle.com>
>>
>> Add timestamping option SOF_TIMESTAMPING_OPT_TSONLY. For transmit
>> timestamps, this loops timestamps on top of empty packets.
>>
>> Doing so reduces the pressure on SO_RCVBUF. Payload inspection and
>> cmsg reception (aside from timestamps) are no longer possible. This
>> works together with a follow on patch that allows administrators to
>> only allow tx timestamping if it does not loop payload or metadata.
>
> If this loses IP_PKTINFO, that will be a bit unfortunate.
>

If it doesn't, then we might as well loop the entire payload. For applications
that need pktinfo or other cmsg, do not select the option.
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