sfc: fix devlink info error handling

Avoid early devlink info return if errors arise with MCDI commands
executed for getting the required info from the device. The rationale
is some commands can fail but later ones could still give useful data.
Moreover, some nvram partitions could not be present which needs to be
handled as a non error.

The specific errors are reported through system messages and if any
error appears, it will be reported generically through extack.

Fixes 14743ddd ("sfc: add devlink info support for ef100")
Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@amd.com>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/efx_devlink.c

@@ -171,9 +171,14 @@ static int efx_devlink_info_nvram_partition(struct efx_nic *efx,
 
 	rc = efx_mcdi_nvram_metadata(efx, partition_type, NULL, version, NULL,
 				     0);
+
+	/* If the partition does not exist, that is not an error. */
+	if (rc == -ENOENT)
+		return 0;
+
 	if (rc) {
-		netif_err(efx, drv, efx->net_dev, "mcdi nvram %s: failed\n",
-			  version_name);
+		netif_err(efx, drv, efx->net_dev, "mcdi nvram %s: failed (rc=%d)\n",
+			  version_name, rc);
 		return rc;
 	}
 
@@ -187,36 +192,33 @@ static int efx_devlink_info_nvram_partition(struct efx_nic *efx,
 static int efx_devlink_info_stored_versions(struct efx_nic *efx,
 					    struct devlink_info_req *req)
 {
-	int rc;
+	int err;
 
-	rc = efx_devlink_info_nvram_partition(efx, req,
+	/* We do not care here about the specific error but just if an error
+	 * happened. The specific error will be reported inside the call
+	 * through system messages, and if any error happened in any call
+	 * below, we report it through extack.
+	 */
+	err = efx_devlink_info_nvram_partition(efx, req,
 					       NVRAM_PARTITION_TYPE_BUNDLE,
 					       DEVLINK_INFO_VERSION_GENERIC_FW_BUNDLE_ID);
-	if (rc)
-		return rc;
 
-	rc = efx_devlink_info_nvram_partition(efx, req,
+	err |= efx_devlink_info_nvram_partition(efx, req,
 						NVRAM_PARTITION_TYPE_MC_FIRMWARE,
 						DEVLINK_INFO_VERSION_GENERIC_FW_MGMT);
-	if (rc)
-		return rc;
 
-	rc = efx_devlink_info_nvram_partition(efx, req,
+	err |= efx_devlink_info_nvram_partition(efx, req,
 						NVRAM_PARTITION_TYPE_SUC_FIRMWARE,
 						EFX_DEVLINK_INFO_VERSION_FW_MGMT_SUC);
-	if (rc)
-		return rc;
 
-	rc = efx_devlink_info_nvram_partition(efx, req,
+	err |= efx_devlink_info_nvram_partition(efx, req,
 						NVRAM_PARTITION_TYPE_EXPANSION_ROM,
 						EFX_DEVLINK_INFO_VERSION_FW_EXPROM);
-	if (rc)
-		return rc;
 
-	rc = efx_devlink_info_nvram_partition(efx, req,
+	err |= efx_devlink_info_nvram_partition(efx, req,
 						NVRAM_PARTITION_TYPE_EXPANSION_UEFI,
 						EFX_DEVLINK_INFO_VERSION_FW_UEFI);
-	return rc;
+	return err;
 }
 
 #define EFX_VER_FLAG(_f)	\
@@ -587,27 +589,20 @@ static int efx_devlink_info_get(struct devlink *devlink,
 {
 	struct efx_devlink *devlink_private = devlink_priv(devlink);
 	struct efx_nic *efx = devlink_private->efx;
-	int rc;
+	int err;
 
-	/* Several different MCDI commands are used. We report first error
-	 * through extack returning at that point. Specific error
-	 * information via system messages.
+	/* Several different MCDI commands are used. We report if errors
+	 * happened through extack. Specific error information via system
+	 * messages inside the calls.
 	 */
-	rc = efx_devlink_info_board_cfg(efx, req);
-	if (rc) {
-		NL_SET_ERR_MSG_MOD(extack, "Getting board info failed");
-		return rc;
-	}
-	rc = efx_devlink_info_stored_versions(efx, req);
-	if (rc) {
-		NL_SET_ERR_MSG_MOD(extack, "Getting stored versions failed");
-		return rc;
-	}
-	rc = efx_devlink_info_running_versions(efx, req);
-	if (rc) {
-		NL_SET_ERR_MSG_MOD(extack, "Getting running versions failed");
-		return rc;
-	}
+	err = efx_devlink_info_board_cfg(efx, req);
+
+	err |= efx_devlink_info_stored_versions(efx, req);
+
+	err |= efx_devlink_info_running_versions(efx, req);
+
+	if (err)
+		NL_SET_ERR_MSG_MOD(extack, "Errors when getting device info. Check system messages");
 
 	return 0;
 }