ice: Implement ethtool reset support

Enable ethtool reset support. Ethtool reset flags are mapped to the
E810 reset type:
PF reset:
$ ethtool --reset <ethX> irq dma filter offload
CORE reset:
$ ethtool --reset <ethX> irq-shared dma-shared filter-shared \
offload-shared ram-shared
GLOBAL reset:
$ ethtool --reset <ethX> irq-shared dma-shared filter-shared \
offload-shared mac-shared phy-shared ram-shared

Calling the same set of flags as in PF reset case on port representor
triggers VF reset.

Reviewed-by: Michal Swiatkowski <[e-mail]>
Reviewed-by: Marcin Szycik <[e-mail]>
Reviewed-by: Przemek Kitszel <[e-mail]>
Acked-by: Jakub Kicinski <[e-mail]>
Signed-off-by: Wojciech Drewek <[e-mail]>
Tested-by: Pucha Himasekhar Reddy <[e-mail]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[e-mail]>

Documentation/networking/device_drivers/ethernet/intel/ice.rst

···
 rx_bytes as "X", then ethtool (hardware statistics) will display rx_bytes as
 "X+40" (4 bytes CRC x 10 packets).
 
+ethtool reset
+-------------
+The driver supports 3 types of resets:
+
+- PF reset - resets only components associated with the given PF, does not
+  impact other PFs
+
+- CORE reset - whole adapter is affected, reset all PFs
+
+- GLOBAL reset - same as CORE but mac and phy components are also reinitialized
+
+These are mapped to ethtool reset flags as follow:
+
+- PF reset:
+
+  # ethtool --reset <ethX> irq dma filter offload
+
+- CORE reset:
+
+  # ethtool --reset <ethX> irq-shared dma-shared filter-shared offload-shared \
+  ram-shared
+
+- GLOBAL reset:
+
+  # ethtool --reset <ethX> irq-shared dma-shared filter-shared offload-shared \
+  mac-shared phy-shared ram-shared
+
+In switchdev mode you can reset a VF using port representor:
+
+  # ethtool --reset <repr> irq dma filter offload
+
 
 Viewing Link Messages
 ---------------------

drivers/net/ethernet/intel/ice/ice_ethtool.c

···
 			    pi->lport, err);
 }
 
+#define ICE_ETHTOOL_PFR (ETH_RESET_IRQ | ETH_RESET_DMA | \
+	ETH_RESET_FILTER | ETH_RESET_OFFLOAD)
+
+#define ICE_ETHTOOL_CORER ((ICE_ETHTOOL_PFR | ETH_RESET_RAM) << \
+	ETH_RESET_SHARED_SHIFT)
+
+#define ICE_ETHTOOL_GLOBR (ICE_ETHTOOL_CORER | \
+	(ETH_RESET_MAC << ETH_RESET_SHARED_SHIFT) | \
+	(ETH_RESET_PHY << ETH_RESET_SHARED_SHIFT))
+
+#define ICE_ETHTOOL_VFR ICE_ETHTOOL_PFR
+
+/**
+ * ice_ethtool_reset - triggers a given type of reset
+ * @dev: network interface device structure
+ * @flags: set of reset flags
+ *
+ * Return: 0 on success, -EOPNOTSUPP when using unsupported set of flags.
+ */
+static int ice_ethtool_reset(struct net_device *dev, u32 *flags)
+{
+	struct ice_netdev_priv *np = netdev_priv(dev);
+	struct ice_pf *pf = np->vsi->back;
+	enum ice_reset_req reset;
+
+	switch (*flags) {
+	case ICE_ETHTOOL_CORER:
+		reset = ICE_RESET_CORER;
+		break;
+	case ICE_ETHTOOL_GLOBR:
+		reset = ICE_RESET_GLOBR;
+		break;
+	case ICE_ETHTOOL_PFR:
+		reset = ICE_RESET_PFR;
+		break;
+	default:
+		netdev_info(dev, "Unsupported set of ethtool flags");
+		return -EOPNOTSUPP;
+	}
+
+	ice_schedule_reset(pf, reset);
+
+	*flags = 0;
+
+	return 0;
+}
+
+/**
+ * ice_repr_ethtool_reset - triggers a VF reset
+ * @dev: network interface device structure
+ * @flags: set of reset flags
+ *
+ * Return: 0 on success,
+ * -EOPNOTSUPP when using unsupported set of flags
+ * -EBUSY when VF is not ready for reset.
+ */
+static int ice_repr_ethtool_reset(struct net_device *dev, u32 *flags)
+{
+	struct ice_repr *repr = ice_netdev_to_repr(dev);
+	struct ice_vf *vf;
+
+	if (repr->type != ICE_REPR_TYPE_VF ||
+	    *flags != ICE_ETHTOOL_VFR)
+		return -EOPNOTSUPP;
+
+	vf = repr->vf;
+
+	if (ice_check_vf_ready_for_cfg(vf))
+		return -EBUSY;
+
+	*flags = 0;
+
+	return ice_reset_vf(vf, ICE_VF_RESET_VFLR | ICE_VF_RESET_LOCK);
+}
+
 static const struct ethtool_ops ice_ethtool_ops = {
 	.cap_rss_ctx_supported  = true,
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
···
 	.nway_reset		= ice_nway_reset,
 	.get_pauseparam		= ice_get_pauseparam,
 	.set_pauseparam		= ice_set_pauseparam,
+	.reset			= ice_ethtool_reset,
 	.get_rxfh_key_size	= ice_get_rxfh_key_size,
 	.get_rxfh_indir_size	= ice_get_rxfh_indir_size,
 	.get_rxfh		= ice_get_rxfh,
···
 	.get_strings		= ice_repr_get_strings,
 	.get_ethtool_stats      = ice_repr_get_ethtool_stats,
 	.get_sset_count		= ice_repr_get_sset_count,
+	.reset			= ice_repr_ethtool_reset,
 };
 
 /**