Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue

Tony Nguyen says:

====================
Intel Wired LAN Driver Updates 2022-08-18 (ice)

This series contains updates to ice driver only.

Jesse and Anatolii add support for controlling FCS/CRC stripping via
ethtool.

Anirudh allows for 100M speeds on devices which support it.

Sylwester removes ucast_shared field and the associated dead code related
to it.

Mikael removes non-inclusive language from the driver.

* '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue:
  ice: remove non-inclusive language
  ice: Remove ucast_shared
  ice: Allow 100M speeds for some devices
  ice: Implement FCS/CRC and VLAN stripping co-existence policy
  ice: Implement control of FCS/CRC stripping
====================

Link: https://lore.kernel.org/r/20220818155207.996297-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 65 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 4ecaf40cf946..223a7507af7b 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3376,6 +3376,11 @@ static void ice_set_netdev_features(struct net_device *netdev)
 	if (is_dvm_ena)
 		netdev->hw_features |= NETIF_F_HW_VLAN_STAG_RX |
 			NETIF_F_HW_VLAN_STAG_TX;
+
+	/* Leave CRC / FCS stripping enabled by default, but allow the value to
+	 * be changed at runtime
+	 */
+	netdev->hw_features |= NETIF_F_RXFCS;
 }
 
 /**
@@ -4667,8 +4672,6 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
 		ice_set_safe_mode_caps(hw);
 	}
 
-	hw->ucast_shared = true;
-
 	err = ice_init_pf(pf);
 	if (err) {
 		dev_err(dev, "ice_init_pf failed: %d\n", err);
@@ -5727,6 +5730,9 @@ ice_fdb_del(struct ndmsg *ndm, __always_unused struct nlattr *tb[],
 					 NETIF_F_HW_VLAN_STAG_RX | \
 					 NETIF_F_HW_VLAN_STAG_TX)
 
+#define NETIF_VLAN_STRIPPING_FEATURES	(NETIF_F_HW_VLAN_CTAG_RX | \
+					 NETIF_F_HW_VLAN_STAG_RX)
+
 #define NETIF_VLAN_FILTERING_FEATURES	(NETIF_F_HW_VLAN_CTAG_FILTER | \
 					 NETIF_F_HW_VLAN_STAG_FILTER)
 
@@ -5813,6 +5819,14 @@ ice_fix_features(struct net_device *netdev, netdev_features_t features)
 			      NETIF_F_HW_VLAN_STAG_TX);
 	}
 
+	if (!(netdev->features & NETIF_F_RXFCS) &&
+	    (features & NETIF_F_RXFCS) &&
+	    (features & NETIF_VLAN_STRIPPING_FEATURES) &&
+	    !ice_vsi_has_non_zero_vlans(np->vsi)) {
+		netdev_warn(netdev, "Disabling VLAN stripping as FCS/CRC stripping is also disabled and there is no VLAN configured\n");
+		features &= ~NETIF_VLAN_STRIPPING_FEATURES;
+	}
+
 	return features;
 }
 
@@ -5906,6 +5920,13 @@ ice_set_vlan_features(struct net_device *netdev, netdev_features_t features)
 	current_vlan_features = netdev->features & NETIF_VLAN_OFFLOAD_FEATURES;
 	requested_vlan_features = features & NETIF_VLAN_OFFLOAD_FEATURES;
 	if (current_vlan_features ^ requested_vlan_features) {
+		if ((features & NETIF_F_RXFCS) &&
+		    (features & NETIF_VLAN_STRIPPING_FEATURES)) {
+			dev_err(ice_pf_to_dev(vsi->back),
+				"To enable VLAN stripping, you must first enable FCS/CRC stripping\n");
+			return -EIO;
+		}
+
 		err = ice_set_vlan_offload_features(vsi, features);
 		if (err)
 			return err;
@@ -5987,6 +6008,23 @@ ice_set_features(struct net_device *netdev, netdev_features_t features)
 	if (ret)
 		return ret;
 
+	/* Turn on receive of FCS aka CRC, and after setting this
+	 * flag the packet data will have the 4 byte CRC appended
+	 */
+	if (changed & NETIF_F_RXFCS) {
+		if ((features & NETIF_F_RXFCS) &&
+		    (features & NETIF_VLAN_STRIPPING_FEATURES)) {
+			dev_err(ice_pf_to_dev(vsi->back),
+				"To disable FCS/CRC stripping, you must first disable VLAN stripping\n");
+			return -EIO;
+		}
+
+		ice_vsi_cfg_crc_strip(vsi, !!(features & NETIF_F_RXFCS));
+		ret = ice_down_up(vsi);
+		if (ret)
+			return ret;
+	}
+
 	if (changed & NETIF_F_NTUPLE) {
 		bool ena = !!(features & NETIF_F_NTUPLE);
 
@@ -6691,6 +6729,31 @@ int ice_down(struct ice_vsi *vsi)
 }
 
 /**
+ * ice_down_up - shutdown the VSI connection and bring it up
+ * @vsi: the VSI to be reconnected
+ */
+int ice_down_up(struct ice_vsi *vsi)
+{
+	int ret;
+
+	/* if DOWN already set, nothing to do */
+	if (test_and_set_bit(ICE_VSI_DOWN, vsi->state))
+		return 0;
+
+	ret = ice_down(vsi);
+	if (ret)
+		return ret;
+
+	ret = ice_up(vsi);
+	if (ret) {
+		netdev_err(vsi->netdev, "reallocating resources failed during netdev features change, may need to reload driver\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
  * ice_vsi_setup_tx_rings - Allocate VSI Tx queue resources
  * @vsi: VSI having resources allocated
  *