net/mlx5e: Extend SKB room check to include PTP-SQ
authorAya Levin <ayal@nvidia.com>
Wed, 26 Oct 2022 13:51:42 +0000 (14:51 +0100)
committerJakub Kicinski <kuba@kernel.org>
Thu, 27 Oct 2022 18:06:55 +0000 (11:06 -0700)
commit19b43a432e3e47db656a8269a74b50aef826950c
tree84f6b74c67d6d92687a19d73916866dcccfdf5b0
parent4ea9891d66410da5030dababb4b825d8e41cd7bb
net/mlx5e: Extend SKB room check to include PTP-SQ

When tx_port_ts is set, the driver diverts all UPD traffic over PTP port
to a dedicated PTP-SQ. The SKBs are cached until the wire-CQE arrives.
When the packet size is greater then MTU, the firmware might drop it and
the packet won't be transmitted to the wire, hence the wire-CQE won't
reach the driver. In this case the SKBs are accumulated in the SKB fifo.
Add room check to consider the PTP-SQ SKB fifo, when the SKB fifo is
full, driver stops the queue resulting in a TX timeout. Devlink
TX-reporter can recover from it.

Fixes: 1880bc4e4a96 ("net/mlx5e: Add TX port timestamp support")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20221026135153.154807-5-saeed@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
drivers/net/ethernet/mellanox/mlx5/core/en/ptp.h
drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c