On 30/07/2024 14:40, Tariq Toukan wrote:
> Hi,
>
> This is V3. You can find V2 as part of a larger series here:
> https://lore.kernel.org/netdev/d1dba3e1-2ecc-4fdf-a23b-7696c4bccf45@gmail.com/T/
>
> This patchset by Rahul and Carolina adds PTM (Precision Time Measurement)
> support to the mlx5 driver.
>
> PTM is a PCI extended capability introduced by PCI-SIG for providing an
> accurate read of the device clock offset without being impacted by
> asymmetric bus transfer rates.
>
> The performance of PTM on ConnectX-7 was evaluated using both real-time
> (RTC) and free-running (FRC) clocks under traffic and no traffic
> conditions. Tests with phc2sys measured the maximum offset values at a 50Hz
> rate, with and without PTM.
>
> Results:
>
> 1. No traffic
> +-----+--------+--------+
> | | No-PTM | PTM |
> +-----+--------+--------+
> | FRC | 125 ns | <29 ns |
> +-----+--------+--------+
> | RTC | 248 ns | <34 ns |
> +-----+--------+--------+
>
> 2. With traffic
> +-----+--------+--------+
> | | No-PTM | PTM |
> +-----+--------+--------+
> | FRC | 254 ns | <40 ns |
> +-----+--------+--------+
> | RTC | 255 ns | <45 ns |
> +-----+--------+--------+
>
>
> Series generated against:
> commit 1722389b0d86 ("Merge tag 'net-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
>
> Thanks,
> Tariq.
>
> V3:
> - Rebased on latest. As a result, had to replace the call to the recently
> removed function convert_art_ns_to_tsc().
> - Added more CCs to the series per Jakub's feedback.
> - Added perf numbers.
>
>
> Carolina Jubran (1):
> net/mlx5: Add support for enabling PTM PCI capability
>
> Rahul Rameshbabu (2):
> net/mlx5: Add support for MTPTM and MTCTR registers
> net/mlx5: Implement PTM cross timestamping support
>
> drivers/net/ethernet/mellanox/mlx5/core/fw.c | 1 +
> .../ethernet/mellanox/mlx5/core/lib/clock.c | 91 +++++++++++++++++++
> .../net/ethernet/mellanox/mlx5/core/main.c | 6 ++
> include/linux/mlx5/device.h | 7 +-
> include/linux/mlx5/driver.h | 2 +
> include/linux/mlx5/mlx5_ifc.h | 43 +++++++++
> 6 files changed, 149 insertions(+), 1 deletion(-)
>
For the series:
Tested-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>