Merge branch 'devlink-Add-board-serial_number-field-to-info_get-cb'

Vasundhara Volam says:

====================
devlink: Add board.serial_number field to info_get cb.

This patchset adds support for board.serial_number to devlink info_get
cb and also use it in bnxt_en driver.

Sample output:

$ devlink dev info pci/0000:af:00.1
pci/0000:af:00.1:
  driver bnxt_en
  serial_number 00-10-18-FF-FE-AD-1A-00
  board.serial_number 433551F+172300000
  versions:
      fixed:
        board.id 7339763 Rev 0.
        asic.id 16D7
        asic.rev 1
      running:
        fw 216.1.216.0
        fw.psid 0.0.0
        fw.mgmt 216.1.192.0
        fw.mgmt.api 1.10.1
        fw.ncsi 0.0.0.0
        fw.roce 216.1.16.0

v2:
- Modify board_serial_number to board.serial_number for maintaining
consistency.
- Combine 2 lines in second patchset as column limit is 100 now
====================
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/devlink/devlink-info.rst

@@ -44,9 +44,11 @@ versions is generally discouraged - here, and via any other Linux API.
        reported for two ports of the same device or on two hosts of
        a multi-host device should be identical.
 
-       .. note:: ``devlink-info`` API should be extended with a new field
-	  if devices want to report board/product serial number (often
-	  reported in PCI *Vital Product Data* capability).
+   * - ``board.serial_number``
+     - Board serial number of the device.
+
+       This is usually the serial number of the board, often available in
+       PCI *Vital Product Data*.
 
    * - ``fixed``
      - Group for hardware identifiers, and versions of components
@@ -201,10 +203,6 @@ Future work
 
 The following extensions could be useful:
 
- - product serial number - NIC boards often get labeled with a board serial
-   number rather than ASIC serial number; it'd be useful to add board serial
-   numbers to the API if they can be retrieved from the device;
-
  - on-disk firmware file names - drivers list the file names of firmware they
    may need to load onto devices via the ``MODULE_FIRMWARE()`` macro. These,
    however, are per module, rather than per device. It'd be useful to list

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

@@ -411,6 +411,12 @@ static int bnxt_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
 			return rc;
 	}
 
+	if (strlen(bp->board_serialno)) {
+		rc = devlink_info_board_serial_number_put(req, bp->board_serialno);
+		if (rc)
+			return rc;
+	}
+
 	sprintf(buf, "%X", bp->chip_num);
 	rc = devlink_info_version_fixed_put(req,
 			DEVLINK_INFO_VERSION_GENERIC_ASIC_ID, buf);

include/net/devlink.h

@@ -1284,6 +1284,8 @@ int devlink_info_serial_number_put(struct devlink_info_req *req,
 				   const char *sn);
 int devlink_info_driver_name_put(struct devlink_info_req *req,
 				 const char *name);
+int devlink_info_board_serial_number_put(struct devlink_info_req *req,
+					 const char *bsn);
 int devlink_info_version_fixed_put(struct devlink_info_req *req,
 				   const char *version_name,
 				   const char *version_value);

include/uapi/linux/devlink.h

@@ -453,6 +453,8 @@ enum devlink_attr {
 
 	DEVLINK_ATTR_PORT_FUNCTION,			/* nested */
 
+	DEVLINK_ATTR_INFO_BOARD_SERIAL_NUMBER,	/* string */
+
 	/* add new attributes above here, update the policy in devlink.c */
 
 	__DEVLINK_ATTR_MAX,

net/core/devlink.c

@@ -4502,6 +4502,14 @@ int devlink_info_serial_number_put(struct devlink_info_req *req, const char *sn)
 }
 EXPORT_SYMBOL_GPL(devlink_info_serial_number_put);
 
+int devlink_info_board_serial_number_put(struct devlink_info_req *req,
+					 const char *bsn)
+{
+	return nla_put_string(req->msg, DEVLINK_ATTR_INFO_BOARD_SERIAL_NUMBER,
+			      bsn);
+}
+EXPORT_SYMBOL_GPL(devlink_info_board_serial_number_put);
+
 static int devlink_info_version_put(struct devlink_info_req *req, int attr,
 				    const char *version_name,
 				    const char *version_value)