linux-kernel - Re: [RFC PATCH] net: macb: Process tx timestamp only on ptp packets

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 24 Aug 2021 19:08:14 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Harini Katakam <harinik@...inx.com>
Cc:     Harini Katakam <harini.katakam@...inx.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        David Miller <davem@...emloft.net>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Andrei Pistirica <andrei.pistirica@...rochip.com>,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Michal Simek <michal.simek@...inx.com>
Subject: Re: [RFC PATCH] net: macb: Process tx timestamp only on ptp packets

On Tue, Aug 24, 2021 at 08:59:20PM +0530, Harini Katakam wrote:
> Yes, there is no SW overhead because the  skb check ensures timestamp
> post processing is done only on requested packets. But the IP
> timestamps all packets
> because this is a register level setting, not per packet. That's the
> overhead I was referring to.

But the IP block time stamps the frames in silicon, no?

I don't see how that is "overhead" in any sense of the word.

Thanks,
Richard