netdev - [PATCH net-next 2/2] mlxsw: core: Add support for devlink info command

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Date:   Tue, 26 Mar 2019 13:46:26 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Shalom Toledo <shalomt@...lanox.com>,
        mlxsw <mlxsw@...lanox.com>, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 2/2] mlxsw: core: Add support for devlink info
 command

From: Shalom Toledo <shalomt@...lanox.com>

Expose the following ASIC information via devlink info command:
  - Hardware revision
  - Firmware PSID
  - Running firmware version

Standard output example:
  $ devlink dev info pci/0000:03:00.0
  pci/0000:03:00.0:
    versions:
        fixed:
          hw.revision A0
          fw.psid MT_2750110033
        running:
          fw.version 13.1910.622

Pretty JSON example:
  $ devlink -jp dev info pci/0000:03:00.0
  {
      "info": {
          "pci/0000:03:00.0": {
              "versions": {
                  "fixed": {
                      "hw.revision": "A0",
                      "fw.psid": "MT_2750110033"
                  },
                  "running": {
                      "fw.version": "13.1910.622"
                  }
              }
          }
      }
  }

Signed-off-by: Shalom Toledo <shalomt@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index e70bb673eeec..61ab3fea2376 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -934,6 +934,41 @@ mlxsw_devlink_sb_occ_tc_port_bind_get(struct devlink_port *devlink_port,
 						     pool_type, p_cur, p_max);
 }
 
+static int
+mlxsw_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
+		       struct netlink_ext_ack *extack)
+{
+	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
+	char fw_info_psid[MLXSW_REG_MGIR_FW_INFO_PSID_SIZE];
+	u32 hw_rev, fw_major, fw_minor, fw_sub_minor;
+	char mgir_pl[MLXSW_REG_MGIR_LEN];
+	char buf[32];
+	int err;
+
+	mlxsw_reg_mgir_pack(mgir_pl);
+	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mgir), mgir_pl);
+	if (err)
+		return err;
+	mlxsw_reg_mgir_unpack(mgir_pl, &hw_rev, fw_info_psid, &fw_major,
+			      &fw_minor, &fw_sub_minor);
+
+	sprintf(buf, "%X", hw_rev);
+	err = devlink_info_version_fixed_put(req, "hw.revision", buf);
+	if (err)
+		return err;
+
+	err = devlink_info_version_fixed_put(req, "fw.psid", fw_info_psid);
+	if (err)
+		return err;
+
+	sprintf(buf, "%d.%d.%d", fw_major, fw_minor, fw_sub_minor);
+	err = devlink_info_version_running_put(req, "fw.version", buf);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 static int mlxsw_devlink_core_bus_device_reload(struct devlink *devlink,
 						struct netlink_ext_ack *extack)
 {
@@ -968,6 +1003,7 @@ static const struct devlink_ops mlxsw_devlink_ops = {
 	.sb_occ_max_clear		= mlxsw_devlink_sb_occ_max_clear,
 	.sb_occ_port_pool_get		= mlxsw_devlink_sb_occ_port_pool_get,
 	.sb_occ_tc_port_bind_get	= mlxsw_devlink_sb_occ_tc_port_bind_get,
+	.info_get			= mlxsw_devlink_info_get,
 };
 
 static int
-- 
2.20.1