net/mlx5e: Sync txq2sq updates with mlx5e_xmit for HTB queues

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This commit makes necessary changes to guarantee that txq2sq remains
stable while mlx5e_xmit is running. Proper synchronization is added for
HTB TX queues.

All updates to txq2sq are performed while the corresponding queue is
disabled (i.e. mlx5e_xmit doesn't run on that queue). smp_wmb after each
change guarantees that mlx5e_xmit can see the updated value after the
queue is enabled. Comments explaining this mechanism are added to
mlx5e_xmit.

When an HTB SQ can be deleted (after deleting an HTB node), synchronize
with RCU to wait for mlx5e_select_queue to finish and stop selecting
that queue, before we re-enable it to avoid TX timeout watchdog alarms.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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This commit is contained in:

Maxim Mikityanskiy 2022-01-25 12:52:50 +02:00 • committed by Saeed Mahameed

parent 6ce204eac3

commit 17c84cb46e

2 changed files with 33 additions and 4 deletions

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24

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

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13

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

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