[PATCH AUTOSEL 5.16 209/217] net/mlx5: Update log_max_qp value to FW max capability

From: Sasha Levin
Date: Mon Jan 17 2022 - 21:49:27 EST


From: Maher Sanalla <msanalla@xxxxxxxxxx>

[ Upstream commit f79a609ea6bf54ad2d2c24e4de4524288b221666 ]

log_max_qp in driver's default profile #2 was set to 18, but FW actually
supports 17 at the most - a situation that led to the concerning print
when the driver is loaded:
"log_max_qp value in current profile is 18, changing to HCA capabaility
limit (17)"

The expected behavior from mlx5_profile #2 is to match the maximum FW
capability in regards to log_max_qp. Thus, log_max_qp in profile #2 is
initialized to a defined static value (0xff) - which basically means that
when loading this profile, log_max_qp value will be what the currently
installed FW supports at most.

Signed-off-by: Maher Sanalla <msanalla@xxxxxxxxxx>
Reviewed-by: Maor Gottlieb <maorg@xxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/main.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 65083496f9131..6e381111f1d2f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -98,6 +98,8 @@ enum {
MLX5_ATOMIC_REQ_MODE_HOST_ENDIANNESS = 0x1,
};

+#define LOG_MAX_SUPPORTED_QPS 0xff
+
static struct mlx5_profile profile[] = {
[0] = {
.mask = 0,
@@ -109,7 +111,7 @@ static struct mlx5_profile profile[] = {
[2] = {
.mask = MLX5_PROF_MASK_QP_SIZE |
MLX5_PROF_MASK_MR_CACHE,
- .log_max_qp = 18,
+ .log_max_qp = LOG_MAX_SUPPORTED_QPS,
.mr_cache[0] = {
.size = 500,
.limit = 250
@@ -507,7 +509,9 @@ static int handle_hca_cap(struct mlx5_core_dev *dev, void *set_ctx)
to_fw_pkey_sz(dev, 128));

/* Check log_max_qp from HCA caps to set in current profile */
- if (MLX5_CAP_GEN_MAX(dev, log_max_qp) < prof->log_max_qp) {
+ if (prof->log_max_qp == LOG_MAX_SUPPORTED_QPS) {
+ prof->log_max_qp = MLX5_CAP_GEN_MAX(dev, log_max_qp);
+ } else if (MLX5_CAP_GEN_MAX(dev, log_max_qp) < prof->log_max_qp) {
mlx5_core_warn(dev, "log_max_qp value in current profile is %d, changing it to HCA capability limit (%d)\n",
prof->log_max_qp,
MLX5_CAP_GEN_MAX(dev, log_max_qp));
--
2.34.1