netdev - [PATCH mlx5-next] RDMA/mlx5: Use sq timestamp as QP timestamp when RoCE is disabled

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Message-ID: <32801966eb767c7fd62b8dea3b63991d5fbfe213.1718554199.git.leon@kernel.org>
Date: Sun, 16 Jun 2024 19:10:36 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Or Har-Toov <ohartoov@...dia.com>,
	linux-rdma@...r.kernel.org,
	Maher Sanalla <msanalla@...dia.com>,
	Maor Gottlieb <maorg@...dia.com>,
	netdev@...r.kernel.org,
	Saeed Mahameed <saeedm@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH mlx5-next] RDMA/mlx5: Use sq timestamp as QP timestamp when RoCE is disabled

From: Or Har-Toov <ohartoov@...dia.com>

When creating a QP, one of the attributes is TS format (timestamp).
In some devices, we have a limitation that all QPs should have the same
ts_format. The ts_format is chosen based on the device's capability.
The qp_ts_format cap resides under the RoCE caps table, and the
cap will be 0 when RoCE is disabled. So when RoCE is disabled, the
value that should be queried is sq_ts_format under HCA caps.

Consider the case when the system supports REAL_TIME_TS format (0x2),
some QPs are created with REAL_TIME_TS as ts_format, and afterwards
RoCE gets disabled. When trying to construct a new QP, we can't use
the qp_ts_format, that is queried from the RoCE caps table, Since it
leads to passing 0x0 (FREE_RUNNING_TS) as the value of the qp_ts_format,
which is different than the ts_format of the previously allocated
QPs REAL_TIME_TS format (0x2).

Thus, to resolve this, read the sq_ts_format, which also reflect
the supported ts format for the QP when RoCE is disabled.

Fixes: 4806f1e2fee8 ("net/mlx5: Set QP timestamp mode to default")
Signed-off-by: Maher Sanalla <msanalla@...dia.com>
Signed-off-by: Or Har-Toov <ohartoov@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 include/linux/mlx5/qp.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/mlx5/qp.h b/include/linux/mlx5/qp.h
index f0e55bf3ec8b..ad1ce650146c 100644
--- a/include/linux/mlx5/qp.h
+++ b/include/linux/mlx5/qp.h
@@ -576,9 +576,12 @@ static inline const char *mlx5_qp_state_str(int state)

 static inline int mlx5_get_qp_default_ts(struct mlx5_core_dev *dev)
 {
-	return !MLX5_CAP_ROCE(dev, qp_ts_format) ?
-		       MLX5_TIMESTAMP_FORMAT_FREE_RUNNING :
-		       MLX5_TIMESTAMP_FORMAT_DEFAULT;
+	u8 supported_ts_cap = mlx5_get_roce_state(dev) ?
+			      MLX5_CAP_ROCE(dev, qp_ts_format) :
+			      MLX5_CAP_GEN(dev, sq_ts_format);
+
+	return supported_ts_cap ? MLX5_TIMESTAMP_FORMAT_DEFAULT :
+	       MLX5_TIMESTAMP_FORMAT_FREE_RUNNING;
 }

 #endif /* MLX5_QP_H */
-- 
2.45.2