cxgb4: Fix FW flash logic using ethtool

Use t4_fw_upgrade instead of t4_load_fw to write firmware into FLASH, since
t4_load_fw doesn't co-ordinate with the firmware and the adapter can get hosed
enough to require a power cycle of the system.

Based on original work by Casey Leedom <[e-mail]>

Signed-off-by: Hariprasad Shenai <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

···
 int t4_seeprom_wp(struct adapter *adapter, bool enable);
 int get_vpd_params(struct adapter *adapter, struct vpd_params *p);
 int t4_load_fw(struct adapter *adapter, const u8 *fw_data, unsigned int size);
+int t4_fw_upgrade(struct adapter *adap, unsigned int mbox,
+		  const u8 *fw_data, unsigned int size, int force);
 unsigned int t4_flash_cfg_addr(struct adapter *adapter);
 int t4_get_fw_version(struct adapter *adapter, u32 *vers);
 int t4_get_tp_version(struct adapter *adapter, u32 *vers);

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

···
 	int ret;
 	const struct firmware *fw;
 	struct adapter *adap = netdev2adap(netdev);
+	unsigned int mbox = FW_PCIE_FW_MASTER_MASK + 1;
 
 	ef->data[sizeof(ef->data) - 1] = '\0';
 	ret = request_firmware(&fw, ef->data, adap->pdev_dev);
 	if (ret < 0)
 		return ret;
 
-	ret = t4_load_fw(adap, fw->data, fw->size);
+	/* If the adapter has been fully initialized then we'll go ahead and
+	 * try to get the firmware's cooperation in upgrading to the new
+	 * firmware image otherwise we'll try to do the entire job from the
+	 * host ... and we always "force" the operation in this path.
+	 */
+	if (adap->flags & FULL_INIT_DONE)
+		mbox = adap->mbox;
+
+	ret = t4_fw_upgrade(adap, mbox, fw->data, fw->size, 1);
 	release_firmware(fw);
 	if (!ret)
-		dev_info(adap->pdev_dev, "loaded firmware %s\n", ef->data);
+		dev_info(adap->pdev_dev, "loaded firmware %s,"
+			 " reload cxgb4 driver\n", ef->data);
 	return ret;
 }
 

drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

···
 #include "t4_regs.h"
 #include "t4fw_api.h"
 
-static int t4_fw_upgrade(struct adapter *adap, unsigned int mbox,
-			 const u8 *fw_data, unsigned int size, int force);
 /**
  *	t4_wait_op_done_val - wait until an operation is completed
  *	@adapter: the adapter performing the operation
···
  *	positive errno indicates that the adapter is ~probably~ intact, a
  *	negative errno indicates that things are looking bad ...
  */
-static int t4_fw_upgrade(struct adapter *adap, unsigned int mbox,
-			 const u8 *fw_data, unsigned int size, int force)
+int t4_fw_upgrade(struct adapter *adap, unsigned int mbox,
+		  const u8 *fw_data, unsigned int size, int force)
 {
 	const struct fw_hdr *fw_hdr = (const struct fw_hdr *)fw_data;
 	int reset, ret;