net/mlx5e: Recover SQ on excessive PTP TX timestamp delta

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Extend the TX timestamp handler to recover the SQ when the difference
between the port and CQE TX timestamps is abnormally large.

The current logic aborts timestamp delivery if the delta exceeds
1/128 seconds, which matches the maximum expected packet interval in
ptp4l. A larger delta makes the timestamps unreliable.

This change adds recovery if the delta exceeds 0.5 seconds. Such a
large gap should not occur in normal operation and indicates that
firmware is stuck or metadata tracking is out of sync, leading to stale
or mismatched timestamps. Recovering the SQ ensures forward progress
and avoids silently dropping invalid timestamps.

The timestamp handler now takes mlx5e_ptpsq directly to access both CQ
stats and the recovery state.

Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Shahar Shitrit <shshitrit@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1763415729-1238421-3-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Carolina Jubran 2025-11-17 23:42:06 +02:00 • committed by Jakub Kicinski

parent 2e4c44b12f

commit 391dad2e68

3 changed files with 17 additions and 8 deletions

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21

drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c

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2

drivers/net/ethernet/mellanox/mlx5/core/en/ptp.h

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2

drivers/net/ethernet/mellanox/mlx5/core/en_tx.c

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