6.10-stable review patch. If anyone has any objections, please let me know.
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From: Or Har-Toov ohartoov@nvidia.com
[ Upstream commit 0c5275bf75ec3708d95654195ae4ed80d946d088 ]
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@nvidia.com Signed-off-by: Or Har-Toov ohartoov@nvidia.com Link: https://lore.kernel.org/r/32801966eb767c7fd62b8dea3b63991d5fbfe213.171855419... Reviewed-by: Simon Horman horms@kernel.org Signed-off-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 f0e55bf3ec8b5..ad1ce650146cb 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 */