net/mlx5: Expose serial numbers in devlink info

Devlink info allows to expose serial number and board serial number
Get the values from PCI VPD and expose it.

$ devlink dev info
pci/0000:08:00.0:
  driver mlx5_core
  serial_number e4397f872caeed218000846daa7d2f49
  board.serial_number MT2314XZ00YA
  versions:
      fixed:
        fw.psid MT_0000000894
      running:
        fw.version 28.41.1000
        fw 28.41.1000
      stored:
        fw.version 28.41.1000
        fw 28.41.1000
auxiliary/mlx5_core.eth.0:
  driver mlx5_core.eth
pci/0000:08:00.1:
  driver mlx5_core
  serial_number e4397f872caeed218000846daa7d2f49
  board.serial_number MT2314XZ00YA
  versions:
      fixed:
        fw.psid MT_0000000894
      running:
        fw.version 28.41.1000
        fw 28.41.1000
      stored:
        fw.version 28.41.1000
        fw 28.41.1000
auxiliary/mlx5_core.eth.1:
  driver mlx5_core.eth

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Acked-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250610025128.109232-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index 73cd7464437889fb83a1cae7d77cf88c1dfe4b8b..42218834183ac7c2981df2a5c84fd628d569224f 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -35,6 +35,55 @@ static u16 mlx5_fw_ver_subminor(u32 version)
        return version & 0xffff;
 }
 
+static int mlx5_devlink_serial_numbers_put(struct mlx5_core_dev *dev,
+                                          struct devlink_info_req *req,
+                                          struct netlink_ext_ack *extack)
+{
+       struct pci_dev *pdev = dev->pdev;
+       unsigned int vpd_size, kw_len;
+       char *str, *end;
+       u8 *vpd_data;
+       int err = 0;
+       int start;
+
+       vpd_data = pci_vpd_alloc(pdev, &vpd_size);
+       if (IS_ERR(vpd_data))
+               return 0;
+
+       start = pci_vpd_find_ro_info_keyword(vpd_data, vpd_size,
+                                            PCI_VPD_RO_KEYWORD_SERIALNO, &kw_len);
+       if (start >= 0) {
+               str = kstrndup(vpd_data + start, kw_len, GFP_KERNEL);
+               if (!str) {
+                       err = -ENOMEM;
+                       goto end;
+               }
+               end = strchrnul(str, ' ');
+               *end = '\0';
+               err = devlink_info_board_serial_number_put(req, str);
+               kfree(str);
+               if (err)
+                       goto end;
+       }
+
+       start = pci_vpd_find_ro_info_keyword(vpd_data, vpd_size, "V3", &kw_len);
+       if (start >= 0) {
+               str = kstrndup(vpd_data + start, kw_len, GFP_KERNEL);
+               if (!str) {
+                       err = -ENOMEM;
+                       goto end;
+               }
+               err = devlink_info_serial_number_put(req, str);
+               kfree(str);
+               if (err)
+                       goto end;
+       }
+
+end:
+       kfree(vpd_data);
+       return err;
+}
+
 #define DEVLINK_FW_STRING_LEN 32
 
 static int
@@ -49,6 +98,10 @@ mlx5_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
        if (!mlx5_core_is_pf(dev))
                return 0;
 
+       err = mlx5_devlink_serial_numbers_put(dev, req, extack);
+       if (err)
+               return err;
+
        err = devlink_info_version_fixed_put(req, "fw.psid", dev->board_id);
        if (err)
                return err;