linux-kernel - Re: [PATCH net v3 1/1] igc: read before write to SRRCTL register

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Message-ID: <20230417115003.0d2ac372@kernel.org>
Date:   Mon, 17 Apr 2023 11:50:03 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Zulkifli, Muhammad Husaini" <muhammad.husaini.zulkifli@...el.com>
Cc:     "Song, Yoong Siang" <yoong.siang.song@...el.com>,
        "Bezdeka, Florian" <florian.bezdeka@...mens.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "John Fastabend" <john.fastabend@...il.com>,
        "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
        Vedang Patel <vedang.patel@...el.com>,
        "Joseph, Jithu" <jithu.joseph@...el.com>,
        Andre Guedes <andre.guedes@...el.com>,
        "Brouer, Jesper" <brouer@...hat.com>,
        "Stanislav Fomichev" <sdf@...gle.com>,
        "Keller, Jacob E" <jacob.e.keller@...el.com>,
        David Laight <David.Laight@...LAB.COM>,
        "xdp-hints@...-project.net" <xdp-hints@...-project.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH net v3 1/1] igc: read before write to SRRCTL register

On Mon, 17 Apr 2023 02:53:13 +0000 Zulkifli, Muhammad Husaini wrote:
> Are you observing similar issue like below?
> ptp4l: timed out while polling for tx timestamp
> ptp4l: increasing tx_timestamp_timeout may correct this issue
> 
> If yes, only TXSTAMPO register is used for both PTP and non-PTP packets in 
> the current driver code. There is a possibility that the time stamp 
> for a PTP packet will be lost when there is a lot of traffic when multiple 
> applications request for hardware transmission timestamps. 
> Few months back, I submitted a patch series to enable the DMA 
> Timestamp for non-ptp packet which can resolve the above issue.
> https://lore.kernel.org/netdev/20221018010733.4765-1-muhammad.husaini.zulkifli@intel.com/T/
> Will continuing back the activity soon.

FWIW the work on selecting the source of the timestamp is progressing
slowly:

https://lore.kernel.org/all/20230406173308.401924-1-kory.maincent@bootlin.com/