bnxt_en: Extend ETHTOOL_RESET to hot reset driver.

If firmware supports hot reset, extend ETHTOOL_RESET to support
hot reset driver which does not require a driver reload after
ETHTOOL_RESET.  The driver will go through the same coordinated
reset sequence as a firmware initiated fatal/non-fatal reset.
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -6947,6 +6947,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->flags |= BNXT_FLAG_ROCEV2_CAP;
 	if (flags & FUNC_QCAPS_RESP_FLAGS_PCIE_STATS_SUPPORTED)
 		bp->fw_cap |= BNXT_FW_CAP_PCIE_STATS_SUPPORTED;
+	if (flags & FUNC_QCAPS_RESP_FLAGS_HOT_RESET_CAPABLE)
+		bp->fw_cap |= BNXT_FW_CAP_HOT_RESET;
 	if (flags & FUNC_QCAPS_RESP_FLAGS_EXT_STATS_SUPPORTED)
 		bp->fw_cap |= BNXT_FW_CAP_EXT_STATS_SUPPORTED;
 	if (flags &  FUNC_QCAPS_RESP_FLAGS_ERROR_RECOVERY_CAPABLE)

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1671,6 +1671,7 @@ struct bnxt {
 	#define BNXT_FW_CAP_PCIE_STATS_SUPPORTED	0x00020000
 	#define BNXT_FW_CAP_EXT_STATS_SUPPORTED		0x00040000
 	#define BNXT_FW_CAP_ERR_RECOVER_RELOAD		0x00100000
+	#define BNXT_FW_CAP_HOT_RESET			0x00200000
 
 #define BNXT_NEW_RM(bp)		((bp)->fw_cap & BNXT_FW_CAP_NEW_RM)
 	u32			hwrm_spec_code;

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -1787,6 +1787,8 @@ static int bnxt_firmware_reset(struct net_device *dev,
 	case BNXT_FW_RESET_CHIP:
 		req.embedded_proc_type = FW_RESET_REQ_EMBEDDED_PROC_TYPE_CHIP;
 		req.selfrst_status = FW_RESET_REQ_SELFRST_STATUS_SELFRSTASAP;
+		if (bp->fw_cap & BNXT_FW_CAP_HOT_RESET)
+			req.flags = FW_RESET_REQ_FLAGS_RESET_GRACEFUL;
 		break;
 	case BNXT_FW_RESET_AP:
 		req.embedded_proc_type = FW_RESET_REQ_EMBEDDED_PROC_TYPE_AP;
@@ -2983,7 +2985,8 @@ static int bnxt_reset(struct net_device *dev, u32 *flags)
 		return -EOPNOTSUPP;
 	}
 
-	if (pci_vfs_assigned(bp->pdev)) {
+	if (pci_vfs_assigned(bp->pdev) &&
+	    !(bp->fw_cap & BNXT_FW_CAP_HOT_RESET)) {
 		netdev_err(dev,
 			   "Reset not allowed when VFs are assigned to VMs\n");
 		return -EBUSY;
@@ -2996,7 +2999,9 @@ static int bnxt_reset(struct net_device *dev, u32 *flags)
 
 		rc = bnxt_firmware_reset(dev, BNXT_FW_RESET_CHIP);
 		if (!rc) {
-			netdev_info(dev, "Reset request successful. Reload driver to complete reset\n");
+			netdev_info(dev, "Reset request successful.\n");
+			if (!(bp->fw_cap & BNXT_FW_CAP_HOT_RESET))
+				netdev_info(dev, "Reload driver to complete reset\n");
 			*flags = 0;
 		}
 	} else if (*flags == ETH_RESET_AP) {