ethtool: cmis_fw_update: add a layer for supporting firmware update using CDB

According to the CMIS standard, the firmware update process is done using
a CDB commands sequence.

Implement a work that will be triggered from the module layer in the
next patch the will initiate and execute all the CDB commands in order, to
eventually complete the firmware update process.

This flashing process includes, writing the firmware image, running the new
firmware image and committing it after testing, so that it will run upon
reset.

This work will also notify user space about the progress of the firmware
update process.
Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ethtool/Makefile

@@ -8,4 +8,4 @@ ethtool_nl-y	:= netlink.o bitset.o strset.o linkinfo.o linkmodes.o rss.o \
 		   linkstate.o debug.o wol.o features.o privflags.o rings.o \
 		   channels.o coalesce.o pause.o eee.o tsinfo.o cabletest.o \
 		   tunnels.o fec.o eeprom.o stats.o phc_vclocks.o mm.o \
-		   module.o cmis_cdb.o pse-pd.o plca.o mm.o
+		   module.o cmis_fw_update.o cmis_cdb.o pse-pd.o plca.o mm.o

net/ethtool/cmis.h

@@ -20,6 +20,12 @@ struct ethtool_cmis_cdb {
 enum ethtool_cmis_cdb_cmd_id {
 	ETHTOOL_CMIS_CDB_CMD_QUERY_STATUS		= 0x0000,
 	ETHTOOL_CMIS_CDB_CMD_MODULE_FEATURES		= 0x0040,
+	ETHTOOL_CMIS_CDB_CMD_FW_MANAGMENT_FEATURES	= 0x0041,
+	ETHTOOL_CMIS_CDB_CMD_START_FW_DOWNLOAD		= 0x0101,
+	ETHTOOL_CMIS_CDB_CMD_WRITE_FW_BLOCK_LPL		= 0x0103,
+	ETHTOOL_CMIS_CDB_CMD_COMPLETE_FW_DOWNLOAD	= 0x0107,
+	ETHTOOL_CMIS_CDB_CMD_RUN_FW_IMAGE		= 0x0109,
+	ETHTOOL_CMIS_CDB_CMD_COMMIT_FW_IMAGE		= 0x010A,
 };
 
 /**
@@ -47,6 +53,7 @@ struct ethtool_cmis_cdb_request {
 
 #define CDB_F_COMPLETION_VALID		BIT(0)
 #define CDB_F_STATUS_VALID		BIT(1)
+#define CDB_F_MODULE_STATE_VALID	BIT(2)
 
 /**
  * struct ethtool_cmis_cdb_cmd_args - CDB commands execution arguments

net/ethtool/module_fw.h

@@ -25,6 +25,35 @@ struct ethtool_module_fw_flash_params {
 	u8 password_valid:1;
 };
 
+/**
+ * struct ethtool_cmis_fw_update_params - CMIS firmware update specific
+ *						parameters
+ * @dev: Pointer to the net_device to be flashed.
+ * @params: Module firmware flashing parameters.
+ * @ntf_params: Module firmware flashing notification parameters.
+ * @fw: Firmware to flash.
+ */
+struct ethtool_cmis_fw_update_params {
+	struct net_device *dev;
+	struct ethtool_module_fw_flash_params params;
+	struct ethnl_module_fw_flash_ntf_params ntf_params;
+	const struct firmware *fw;
+};
+
+/**
+ * struct ethtool_module_fw_flash - module firmware flashing
+ * @list: List node for &module_fw_flash_work_list.
+ * @dev_tracker: Refcount tracker for @dev.
+ * @work: The flashing firmware work.
+ * @fw_update: CMIS firmware update specific parameters.
+ */
+struct ethtool_module_fw_flash {
+	struct list_head list;
+	netdevice_tracker dev_tracker;
+	struct work_struct work;
+	struct ethtool_cmis_fw_update_params fw_update;
+};
+
 void
 ethnl_module_fw_flash_ntf_err(struct net_device *dev,
 			      struct ethnl_module_fw_flash_ntf_params *params,
@@ -39,3 +68,5 @@ void
 ethnl_module_fw_flash_ntf_in_progress(struct net_device *dev,
 				      struct ethnl_module_fw_flash_ntf_params *params,
 				      u64 done, u64 total);
+
+void ethtool_cmis_fw_update(struct ethtool_cmis_fw_update_params *params);