cxgb4: Update ethtool get_drvinfo to get regdump len

Update ethtool get_drvinfo to display regdump len and also update
firmware string version print to display N/A in case FW isn't present
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c

@@ -211,8 +211,11 @@ static void get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 		sizeof(info->version));
 	strlcpy(info->bus_info, pci_name(adapter->pdev),
 		sizeof(info->bus_info));
+	info->regdump_len = get_regs_len(dev);
 
-	if (adapter->params.fw_vers)
+	if (!adapter->params.fw_vers)
+		strcpy(info->fw_version, "N/A");
+	else
 		snprintf(info->fw_version, sizeof(info->fw_version),
 			 "%u.%u.%u.%u, TP %u.%u.%u.%u",
 			 FW_HDR_FW_VER_MAJOR_G(adapter->params.fw_vers),