Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next

-queue

Tony Nguyen says:

====================
Support rx-fcs on/off for VFs

Ahmed Zaki says:

Allow the user to turn on/off the CRC/FCS stripping through ethtool. We
first add the CRC offload capability in the virtchannel, then the feature
is enabled in ice and iavf drivers.

We make sure that the netdev features are fixed such that CRC stripping
cannot be disabled if VLAN rx offload (VLAN strip) is enabled. Also, VLAN
stripping cannot be enabled unless CRC stripping is ON.

Testing was done using tcpdump to make sure that the CRC is included in
the frame after:

    # ethtool -K <interface> rx-fcs on

and is not included when it is back "off". Also, ethtool should return an
error for the above command if "rx-vlan-offload" is already on and at least
one VLAN interface/filter exists on the VF.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 132 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 738e25657c6b..f32b0453584f 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -406,6 +406,8 @@ struct iavf_adapter {
 			  VIRTCHNL_VF_OFFLOAD_VLAN)
 #define VLAN_V2_ALLOWED(_a) ((_a)->vf_res->vf_cap_flags & \
 			     VIRTCHNL_VF_OFFLOAD_VLAN_V2)
+#define CRC_OFFLOAD_ALLOWED(_a) ((_a)->vf_res->vf_cap_flags & \
+				 VIRTCHNL_VF_OFFLOAD_CRC)
 #define VLAN_V2_FILTERING_ALLOWED(_a) \
 	(VLAN_V2_ALLOWED((_a)) && \
 	 ((_a)->vlan_v2_caps.filtering.filtering_support.outer || \
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 36b94ee44211..a02440664bca 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4401,6 +4401,9 @@ static int iavf_set_features(struct net_device *netdev,
 	    (features & NETIF_VLAN_OFFLOAD_FEATURES))
 		iavf_set_vlan_offload_features(adapter, netdev->features,
 					       features);
+	if (CRC_OFFLOAD_ALLOWED(adapter) &&
+	    ((netdev->features & NETIF_F_RXFCS) ^ (features & NETIF_F_RXFCS)))
+		iavf_schedule_reset(adapter, IAVF_FLAG_RESET_NEEDED);
 
 	return 0;
 }
@@ -4522,6 +4525,9 @@ iavf_get_netdev_vlan_hw_features(struct iavf_adapter *adapter)
 		}
 	}
 
+	if (CRC_OFFLOAD_ALLOWED(adapter))
+		hw_features |= NETIF_F_RXFCS;
+
 	return hw_features;
 }
 
@@ -4686,6 +4692,55 @@ iavf_fix_netdev_vlan_features(struct iavf_adapter *adapter,
 }
 
 /**
+ * iavf_fix_strip_features - fix NETDEV CRC and VLAN strip features
+ * @adapter: board private structure
+ * @requested_features: stack requested NETDEV features
+ *
+ * Returns fixed-up features bits
+ **/
+static netdev_features_t
+iavf_fix_strip_features(struct iavf_adapter *adapter,
+			netdev_features_t requested_features)
+{
+	struct net_device *netdev = adapter->netdev;
+	bool crc_offload_req, is_vlan_strip;
+	netdev_features_t vlan_strip;
+	int num_non_zero_vlan;
+
+	crc_offload_req = CRC_OFFLOAD_ALLOWED(adapter) &&
+			  (requested_features & NETIF_F_RXFCS);
+	num_non_zero_vlan = iavf_get_num_vlans_added(adapter);
+	vlan_strip = (NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_HW_VLAN_STAG_RX);
+	is_vlan_strip = requested_features & vlan_strip;
+
+	if (!crc_offload_req)
+		return requested_features;
+
+	if (!num_non_zero_vlan && (netdev->features & vlan_strip) &&
+	    !(netdev->features & NETIF_F_RXFCS) && is_vlan_strip) {
+		requested_features &= ~vlan_strip;
+		netdev_info(netdev, "Disabling VLAN stripping as FCS/CRC stripping is also disabled and there is no VLAN configured\n");
+		return requested_features;
+	}
+
+	if ((netdev->features & NETIF_F_RXFCS) && is_vlan_strip) {
+		requested_features &= ~vlan_strip;
+		if (!(netdev->features & vlan_strip))
+			netdev_info(netdev, "To enable VLAN stripping, first need to enable FCS/CRC stripping");
+
+		return requested_features;
+	}
+
+	if (num_non_zero_vlan && is_vlan_strip &&
+	    !(netdev->features & NETIF_F_RXFCS)) {
+		requested_features &= ~NETIF_F_RXFCS;
+		netdev_info(netdev, "To disable FCS/CRC stripping, first need to disable VLAN stripping");
+	}
+
+	return requested_features;
+}
+
+/**
  * iavf_fix_features - fix up the netdev feature bits
  * @netdev: our net device
  * @features: desired feature bits
@@ -4697,7 +4752,9 @@ static netdev_features_t iavf_fix_features(struct net_device *netdev,
 {
 	struct iavf_adapter *adapter = netdev_priv(netdev);
 
-	return iavf_fix_netdev_vlan_features(adapter, features);
+	features = iavf_fix_netdev_vlan_features(adapter, features);
+
+	return iavf_fix_strip_features(adapter, features);
 }
 
 static const struct net_device_ops iavf_netdev_ops = {
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 0b97b424e487..8ce6389b5815 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -142,6 +142,7 @@ int iavf_send_vf_config_msg(struct iavf_adapter *adapter)
 	       VIRTCHNL_VF_OFFLOAD_RSS_PCTYPE_V2 |
 	       VIRTCHNL_VF_OFFLOAD_ENCAP |
 	       VIRTCHNL_VF_OFFLOAD_VLAN_V2 |
+	       VIRTCHNL_VF_OFFLOAD_CRC |
 	       VIRTCHNL_VF_OFFLOAD_ENCAP_CSUM |
 	       VIRTCHNL_VF_OFFLOAD_REQ_QUEUES |
 	       VIRTCHNL_VF_OFFLOAD_ADQ |
@@ -312,6 +313,9 @@ void iavf_configure_queues(struct iavf_adapter *adapter)
 		vqpi->rxq.databuffer_size =
 			ALIGN(adapter->rx_rings[i].rx_buf_len,
 			      BIT_ULL(IAVF_RXQ_CTX_DBUFF_SHIFT));
+		if (CRC_OFFLOAD_ALLOWED(adapter))
+			vqpi->rxq.crc_disable = !!(adapter->netdev->features &
+						   NETIF_F_RXFCS);
 		vqpi++;
 	}
 
diff --git a/drivers/net/ethernet/intel/ice/ice_vf_lib.h b/drivers/net/ethernet/intel/ice/ice_vf_lib.h
index 48fea6fa0362..31a082e8a827 100644
--- a/drivers/net/ethernet/intel/ice/ice_vf_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_vf_lib.h
@@ -123,6 +123,9 @@ struct ice_vf {
 	u8 num_req_qs;			/* num of queue pairs requested by VF */
 	u16 num_mac;
 	u16 num_vf_qs;			/* num of queue configured per VF */
+	u8 vlan_strip_ena;		/* Outer and Inner VLAN strip enable */
+#define ICE_INNER_VLAN_STRIP_ENA	BIT(0)
+#define ICE_OUTER_VLAN_STRIP_ENA	BIT(1)
 	struct ice_mdd_vf_events mdd_rx_events;
 	struct ice_mdd_vf_events mdd_tx_events;
 	DECLARE_BITMAP(opcodes_allowlist, VIRTCHNL_OP_MAX);
diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl.c b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
index b03426ac932b..cad237dd8894 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
@@ -486,6 +486,9 @@ static int ice_vc_get_vf_res_msg(struct ice_vf *vf, u8 *msg)
 	if (vf->driver_caps & VIRTCHNL_VF_OFFLOAD_REQ_QUEUES)
 		vfres->vf_cap_flags |= VIRTCHNL_VF_OFFLOAD_REQ_QUEUES;
 
+	if (vf->driver_caps & VIRTCHNL_VF_OFFLOAD_CRC)
+		vfres->vf_cap_flags |= VIRTCHNL_VF_OFFLOAD_CRC;
+
 	if (vf->driver_caps & VIRTCHNL_VF_CAP_ADV_LINK_SPEED)
 		vfres->vf_cap_flags |= VIRTCHNL_VF_CAP_ADV_LINK_SPEED;
 
@@ -1621,6 +1624,15 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
 	}
 
 	for (i = 0; i < qci->num_queue_pairs; i++) {
+		if (!qci->qpair[i].rxq.crc_disable)
+			continue;
+
+		if (!(vf->driver_caps & VIRTCHNL_VF_OFFLOAD_CRC) ||
+		    vf->vlan_strip_ena)
+			goto error_param;
+	}
+
+	for (i = 0; i < qci->num_queue_pairs; i++) {
 		qpi = &qci->qpair[i];
 		if (qpi->txq.vsi_id != qci->vsi_id ||
 		    qpi->rxq.vsi_id != qci->vsi_id ||
@@ -1666,6 +1678,13 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
 			vsi->rx_rings[i]->dma = qpi->rxq.dma_ring_addr;
 			vsi->rx_rings[i]->count = qpi->rxq.ring_len;
 
+			if (qpi->rxq.crc_disable)
+				vsi->rx_rings[q_idx]->flags |=
+					ICE_RX_FLAGS_CRC_STRIP_DIS;
+			else
+				vsi->rx_rings[q_idx]->flags &=
+					~ICE_RX_FLAGS_CRC_STRIP_DIS;
+
 			if (qpi->rxq.databuffer_size != 0 &&
 			    (qpi->rxq.databuffer_size > ((16 * 1024) - 128) ||
 			     qpi->rxq.databuffer_size < 1024))
@@ -2411,6 +2430,21 @@ static int ice_vc_remove_vlan_msg(struct ice_vf *vf, u8 *msg)
 }
 
 /**
+ * ice_vsi_is_rxq_crc_strip_dis - check if Rx queue CRC strip is disabled or not
+ * @vsi: pointer to the VF VSI info
+ */
+static bool ice_vsi_is_rxq_crc_strip_dis(struct ice_vsi *vsi)
+{
+	unsigned int i;
+
+	ice_for_each_alloc_rxq(vsi, i)
+		if (vsi->rx_rings[i]->flags & ICE_RX_FLAGS_CRC_STRIP_DIS)
+			return true;
+
+	return false;
+}
+
+/**
  * ice_vc_ena_vlan_stripping
  * @vf: pointer to the VF info
  *
@@ -2439,6 +2473,8 @@ static int ice_vc_ena_vlan_stripping(struct ice_vf *vf)
 
 	if (vsi->inner_vlan_ops.ena_stripping(vsi, ETH_P_8021Q))
 		v_ret = VIRTCHNL_STATUS_ERR_PARAM;
+	else
+		vf->vlan_strip_ena |= ICE_INNER_VLAN_STRIP_ENA;
 
 error_param:
 	return ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_ENABLE_VLAN_STRIPPING,
@@ -2474,6 +2510,8 @@ static int ice_vc_dis_vlan_stripping(struct ice_vf *vf)
 
 	if (vsi->inner_vlan_ops.dis_stripping(vsi))
 		v_ret = VIRTCHNL_STATUS_ERR_PARAM;
+	else
+		vf->vlan_strip_ena &= ~ICE_INNER_VLAN_STRIP_ENA;
 
 error_param:
 	return ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_DISABLE_VLAN_STRIPPING,
@@ -2649,6 +2687,8 @@ static int ice_vf_init_vlan_stripping(struct ice_vf *vf)
 {
 	struct ice_vsi *vsi = ice_get_vf_vsi(vf);
 
+	vf->vlan_strip_ena = 0;
+
 	if (!vsi)
 		return -EINVAL;
 
@@ -2658,10 +2698,16 @@ static int ice_vf_init_vlan_stripping(struct ice_vf *vf)
 	if (ice_vf_is_port_vlan_ena(vf) && !ice_is_dvm_ena(&vsi->back->hw))
 		return 0;
 
-	if (ice_vf_vlan_offload_ena(vf->driver_caps))
-		return vsi->inner_vlan_ops.ena_stripping(vsi, ETH_P_8021Q);
-	else
-		return vsi->inner_vlan_ops.dis_stripping(vsi);
+	if (ice_vf_vlan_offload_ena(vf->driver_caps)) {
+		int err;
+
+		err = vsi->inner_vlan_ops.ena_stripping(vsi, ETH_P_8021Q);
+		if (!err)
+			vf->vlan_strip_ena |= ICE_INNER_VLAN_STRIP_ENA;
+		return err;
+	}
+
+	return vsi->inner_vlan_ops.dis_stripping(vsi);
 }
 
 static u16 ice_vc_get_max_vlan_fltrs(struct ice_vf *vf)
@@ -3435,6 +3481,11 @@ static int ice_vc_ena_vlan_stripping_v2_msg(struct ice_vf *vf, u8 *msg)
 		goto out;
 	}
 
+	if (ice_vsi_is_rxq_crc_strip_dis(vsi)) {
+		v_ret = VIRTCHNL_STATUS_ERR_NOT_SUPPORTED;
+		goto out;
+	}
+
 	ethertype_setting = strip_msg->outer_ethertype_setting;
 	if (ethertype_setting) {
 		if (ice_vc_ena_vlan_offload(vsi,
@@ -3455,6 +3506,8 @@ static int ice_vc_ena_vlan_stripping_v2_msg(struct ice_vf *vf, u8 *msg)
 			 * enabled, is extracted in L2TAG1.
 			 */
 			ice_vsi_update_l2tsel(vsi, l2tsel);
+
+			vf->vlan_strip_ena |= ICE_OUTER_VLAN_STRIP_ENA;
 		}
 	}
 
@@ -3466,6 +3519,9 @@ static int ice_vc_ena_vlan_stripping_v2_msg(struct ice_vf *vf, u8 *msg)
 		goto out;
 	}
 
+	if (ethertype_setting)
+		vf->vlan_strip_ena |= ICE_INNER_VLAN_STRIP_ENA;
+
 out:
 	return ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_ENABLE_VLAN_STRIPPING_V2,
 				     v_ret, NULL, 0);
@@ -3527,6 +3583,8 @@ static int ice_vc_dis_vlan_stripping_v2_msg(struct ice_vf *vf, u8 *msg)
 			 * in L2TAG1.
 			 */
 			ice_vsi_update_l2tsel(vsi, l2tsel);
+
+			vf->vlan_strip_ena &= ~ICE_OUTER_VLAN_STRIP_ENA;
 		}
 	}
 
@@ -3536,6 +3594,9 @@ static int ice_vc_dis_vlan_stripping_v2_msg(struct ice_vf *vf, u8 *msg)
 		goto out;
 	}
 
+	if (ethertype_setting)
+		vf->vlan_strip_ena &= ~ICE_INNER_VLAN_STRIP_ENA;
+
 out:
 	return ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_DISABLE_VLAN_STRIPPING_V2,
 				     v_ret, NULL, 0);