net/mlx5: Fill out devlink dev info only for PFs

jira LE-3497
Rebuild_History Non-Buildable kernel-5.14.0-570.24.1.el9_6
commit-author Jiri Pirko <[email protected]>
commit d749d90

Firmware version query is supported on the PFs. Due to this
following kernel warning log is observed:

[  188.590344] mlx5_core 0000:08:00.2: mlx5_fw_version_query:816:(pid 1453): fw query isn't supported by the FW

Fix it by restricting the query and devlink info to the PF.

Fixes: 8338d93 ("net/mlx5: Added devlink info callback")
	Signed-off-by: Jiri Pirko <[email protected]>
	Reviewed-by: Kalesh AP <[email protected]>
	Signed-off-by: Tariq Toukan <[email protected]>
	Reviewed-by: Parav Pandit <[email protected]>
Link: https://patch.msgid.link/[email protected]
	Signed-off-by: Jakub Kicinski <[email protected]>
(cherry picked from commit d749d90)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

drivers/net/ethernet/mellanox/mlx5/core/devlink.c

@@ -46,6 +46,9 @@ mlx5_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
 	u32 running_fw, stored_fw;
 	int err;
 
+	if (!mlx5_core_is_pf(dev))
+		return 0;
+
 	err = devlink_info_version_fixed_put(req, "fw.psid", dev->board_id);
 	if (err)
 		return err;