From: Richard Cochran <richardcochran@gmail.com>
To: Eran Ben Elisha <eranbe@nvidia.com>
Cc: Jakub Kicinski <kuba@kernel.org>,
Saeed Mahameed <saeed@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, Tariq Toukan <tariqt@nvidia.com>
Subject: Re: [net-next V2 08/15] net/mlx5e: Add TX PTP port object support
Date: Sun, 6 Dec 2020 09:08:34 -0800 [thread overview]
Message-ID: <20201206170834.GA4342@hoboy.vegasvil.org> (raw)
In-Reply-To: <a4a8adc8-4d4c-3b09-6c2f-ce1d12e0b9bc@nvidia.com>
On Sun, Dec 06, 2020 at 03:37:47PM +0200, Eran Ben Elisha wrote:
> Adding new enum to the ioctl means we have add
> (HWTSTAMP_TX_ON_TIME_CRITICAL_ONLY for example) all the way - drivers,
> kernel ptp, user space ptp, ethtool.
>
> My concerns are:
> 1. Timestamp applications (like ptp4l or similar) will have to add support
> for configuring the driver to use HWTSTAMP_TX_ON_TIME_CRITICAL_ONLY if
> supported via ioctl prior to packets transmit. From application point of
> view, the dual-modes (HWTSTAMP_TX_ON_TIME_CRITICAL_ONLY , HWTSTAMP_TX_ON)
> support is redundant, as it offers nothing new.
Well said.
> 2. Other vendors will have to support it as well, when not sure what is the
> expectation from them if they cannot improve accuracy between them.
If there were multiple different devices out there with this kind of
implementation (different levels of accuracy with increasing run time
performance cost), then we could consider such a flag. However, to my
knowledge, this feature is unique to your device.
> This feature is just an internal enhancement, and as such it should be added
> only as a vendor private configuration flag. We are not offering here about
> any standard for others to follow.
+1
Thanks,
Richard
next prev parent reply other threads:[~2020-12-06 17:10 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 4:20 [pull request][net-next V2 00/15] mlx5 updates 2020-12-01 Saeed Mahameed
2020-12-03 4:20 ` [net-next V2 01/15] net/mlx5e: Free drop RQ in a dedicated function Saeed Mahameed
2020-12-03 4:20 ` [net-next V2 02/15] net/mlx5e: Allow CQ outside of channel context Saeed Mahameed
2020-12-03 4:20 ` [net-next V2 03/15] net/mlx5e: Allow RQ " Saeed Mahameed
2020-12-03 4:20 ` [net-next V2 04/15] net/mlx5e: Allow SQ " Saeed Mahameed
2020-12-03 4:20 ` [net-next V2 05/15] net/mlx5e: Change skb fifo push/pop API to be used without SQ Saeed Mahameed
2020-12-03 4:20 ` [net-next V2 06/15] net/mlx5e: Split SW group counters update function Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 07/15] net/mlx5e: Move MLX5E_RX_ERR_CQE macro Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 08/15] net/mlx5e: Add TX PTP port object support Saeed Mahameed
2020-12-04 2:29 ` Jakub Kicinski
2020-12-04 19:33 ` Saeed Mahameed
2020-12-04 20:26 ` Jakub Kicinski
2020-12-04 21:57 ` Saeed Mahameed
2020-12-04 22:52 ` Jakub Kicinski
2020-12-05 0:55 ` Vladimir Oltean
2020-12-07 6:22 ` Saeed Mahameed
2020-12-04 23:17 ` Jakub Kicinski
2020-12-04 23:57 ` Saeed Mahameed
2020-12-05 0:24 ` Jakub Kicinski
2020-12-06 13:37 ` Eran Ben Elisha
2020-12-06 17:08 ` Richard Cochran [this message]
2020-12-07 8:37 ` Saeed Mahameed
2020-12-07 11:05 ` Eran Ben Elisha
2020-12-07 15:19 ` Richard Cochran
2020-12-07 20:42 ` Jakub Kicinski
2020-12-07 22:04 ` Saeed Mahameed
2020-12-08 13:02 ` Richard Cochran
2020-12-06 13:36 ` Eran Ben Elisha
2020-12-07 20:29 ` Jakub Kicinski
2020-12-06 13:33 ` Eran Ben Elisha
2020-12-05 1:49 ` Vladimir Oltean
2020-12-05 2:10 ` Jakub Kicinski
2020-12-05 13:20 ` Richard Cochran
2020-12-07 5:50 ` Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 09/15] net/mlx5e: Add TX port timestamp support Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 10/15] net/mlx5e: remove unnecessary memset Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 11/15] net/mlx5e: Remove duplicated include Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 12/15] net/mlx5: Arm only EQs with EQEs Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 13/15] net/mlx5: Fix passing zero to 'PTR_ERR' Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 14/15] net/mlx5e: Split between RX/TX tunnel FW support indication Saeed Mahameed
2020-12-03 4:21 ` [net-next V2 15/15] net/mlx5e: Fill mlx5e_create_cq_param in a function Saeed Mahameed
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