net/mlx5: Modify LSB bitmask in temperature event to include only the first bit

[ Upstream commit 633f16d7e07c129a36b882c05379e01ce5bdb542 ]

In the sensor_count field of the MTEWE register, bits 1-62 are
supported only for unmanaged switches, not for NICs, and bit 63
is reserved for internal use.

To prevent confusing output that may include set bits that are
not relevant to NIC sensors, we update the bitmask to retain only
the first bit, which corresponds to the sensor ASIC.

Signed-off-by: Shahar Shitrit <shshitrit@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
Link: https://patch.msgid.link/20250213094641.226501-4-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/events.c b/drivers/net/ethernet/mellanox/mlx5/core/events.c
index 3ce17c3d7a0014082b74a5ac00428935a76f48b9..9d7b0a4cc48a92f2c8d7437e59ba81219089c83b 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/events.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/events.c
@@ -156,6 +156,10 @@ static int temp_warn(struct notifier_block *nb, unsigned long type, void *data)
        u64 value_msb;
 
        value_lsb = be64_to_cpu(eqe->data.temp_warning.sensor_warning_lsb);
+       /* bit 1-63 are not supported for NICs,
+        * hence read only bit 0 (asic) from lsb.
+        */
+       value_lsb &= 0x1;
        value_msb = be64_to_cpu(eqe->data.temp_warning.sensor_warning_msb);
 
        mlx5_core_warn(events->dev,