From: Andrew Lunn <andrew@lunn•ch>
To: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel•com>
Cc: intel-wired-lan@osuosl•org, netdev@vger•kernel.org,
davem@davemloft•net, kuba@kernel•org, edumazet@google•com,
vinicius.gomes@intel•com, aravindhan.gunasekaran@intel•com,
noor.azura.ahmad.tarmizi@intel•com
Subject: Re: [PATCH v1 0/4] Add support for DMA timestamp for non-PTP packets
Date: Tue, 27 Sep 2022 17:27:27 +0200 [thread overview]
Message-ID: <YzMWX1xPC0NChKNl@lunn.ch> (raw)
In-Reply-To: <20220927130656.32567-1-muhammad.husaini.zulkifli@intel.com>
On Tue, Sep 27, 2022 at 09:06:52PM +0800, Muhammad Husaini Zulkifli wrote:
> The HW TX timestamps created by the NIC via socket options can be
> requested using the current network timestamps generation capability of
> SOF_TIMESTAMPING_TX_HARDWARE. The most common users of this socket flag
> is PTP, however other packet applications that require tx timestamps might
> also ask for it.
>
> The problem is that, when there is a lot of traffic, there is a high chance
> that the timestamps for a PTP packet will be lost if both PTP and Non-PTP
> packets use the same SOF TIMESTAMPING TX HARDWARE causing the tx timeout.
>
> DMA timestamps through socket options are not currently available to
> the user. Because if the user wants to, they can configure the hwtstamp
> config option to use the new introduced DMA Time Stamp flag through the
> setsockopt().
>
> With these additional socket options, users can continue to utilise
> HW timestamps for PTP while specifying non-PTP packets to use DMA
> timestamps if the NIC can support them.
Although this is not actually for PTP, you probably should Cc: the PTP
maintainer for patches like this.
Andrew
next prev parent reply other threads:[~2022-09-27 15:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 13:06 [PATCH v1 0/4] Add support for DMA timestamp for non-PTP packets Muhammad Husaini Zulkifli
2022-09-27 13:06 ` [PATCH v1 1/4] ethtool: Add new hwtstamp flag Muhammad Husaini Zulkifli
2022-09-28 0:11 ` Jakub Kicinski
2022-09-29 3:40 ` Zulkifli, Muhammad Husaini
2022-09-27 13:06 ` [PATCH v1 2/4] net-timestamp: Increase the size of tsflags Muhammad Husaini Zulkifli
2022-09-27 13:06 ` [PATCH v1 3/4] net: sock: extend SO_TIMESTAMPING for DMA Fetch Muhammad Husaini Zulkifli
2022-09-27 13:06 ` [PATCH v1 4/4] igc: Add support for DMA timestamp for non-PTP packets Muhammad Husaini Zulkifli
2022-09-27 15:27 ` Andrew Lunn [this message]
2022-09-29 2:22 ` [PATCH v1 0/4] " Zulkifli, Muhammad Husaini
2022-09-28 0:09 ` Jakub Kicinski
2022-09-29 2:35 ` Zulkifli, Muhammad Husaini
2022-09-29 13:56 ` Jakub Kicinski
2022-09-29 14:46 ` Gal Pressman
2022-09-29 15:23 ` Jakub Kicinski
2022-09-30 8:52 ` Zulkifli, Muhammad Husaini
2022-09-30 14:40 ` Jakub Kicinski
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