ice: set and release switchdev environment

Switchdev environment has to be set up when user create VFs
and eswitch mode is switchdev. Release is done when user
delete all VFs.

Data path in this implementation is based on control plane VSI.
This VSI is used to pass traffic from port representors to
corresponding VFs and vice versa. Default TX rule has to be
added to forward packet to control plane VSI. This will redirect
packets from VFs which don't match other rules to control plane
VSI.

On RX side default rule is added on uplink VSI to receive all
traffic that doesn't match other rules. When setting switchdev
environment all other rules from VFs should be removed. Packet to
VFs will be forwarded by control plane VSI.

As VF without any mac rules can't send any packet because of
antispoof mechanism, VSI antispoof should be turned off on each VFs.

To send packet from representor to correct VSI, destination VSI
field in TX descriptor will have to be filled. Allow that by
setting destination override bit in control plane VSI security config.

Packet from VFs will be received on control plane VSI. Driver
should decide to which netdev forward the packet. Decision is
made based on src_vsi field from descriptor. There is a target
netdev list in control plane VSI struct which choose netdev
based on src_vsi number.

Co-developed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: Grzegorz Nitka <grzegorz.nitka@intel.com>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 394 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_eswitch.c b/drivers/net/ethernet/intel/ice/ice_eswitch.c
index 1370c41b77ab..242cdbbce61c 100644
--- a/drivers/net/ethernet/intel/ice/ice_eswitch.c
+++ b/drivers/net/ethernet/intel/ice/ice_eswitch.c
@@ -2,10 +2,372 @@
 /* Copyright (C) 2019-2021, Intel Corporation. */
 
 #include "ice.h"
+#include "ice_lib.h"
 #include "ice_eswitch.h"
+#include "ice_fltr.h"
+#include "ice_repr.h"
 #include "ice_devlink.h"
 
 /**
+ * ice_eswitch_setup_env - configure switchdev HW filters
+ * @pf: pointer to PF struct
+ *
+ * This function adds HW filters configuration specific for switchdev
+ * mode.
+ */
+static int ice_eswitch_setup_env(struct ice_pf *pf)
+{
+	struct ice_vsi *uplink_vsi = pf->switchdev.uplink_vsi;
+	struct ice_vsi *ctrl_vsi = pf->switchdev.control_vsi;
+	struct ice_port_info *pi = pf->hw.port_info;
+	bool rule_added = false;
+
+	ice_vsi_manage_vlan_stripping(ctrl_vsi, false);
+
+	ice_remove_vsi_fltr(&pf->hw, uplink_vsi->idx);
+
+	if (ice_vsi_add_vlan(uplink_vsi, 0, ICE_FWD_TO_VSI))
+		goto err_def_rx;
+
+	if (!ice_is_dflt_vsi_in_use(uplink_vsi->vsw)) {
+		if (ice_set_dflt_vsi(uplink_vsi->vsw, uplink_vsi))
+			goto err_def_rx;
+		rule_added = true;
+	}
+
+	if (ice_cfg_dflt_vsi(pi->hw, ctrl_vsi->idx, true, ICE_FLTR_TX))
+		goto err_def_tx;
+
+	if (ice_vsi_update_security(uplink_vsi, ice_vsi_ctx_set_allow_override))
+		goto err_override_uplink;
+
+	if (ice_vsi_update_security(ctrl_vsi, ice_vsi_ctx_set_allow_override))
+		goto err_override_control;
+
+	if (ice_fltr_update_flags_dflt_rule(ctrl_vsi, pi->dflt_tx_vsi_rule_id,
+					    ICE_FLTR_TX,
+					    ICE_SINGLE_ACT_LB_ENABLE))
+		goto err_update_action;
+
+	return 0;
+
+err_update_action:
+	ice_vsi_update_security(ctrl_vsi, ice_vsi_ctx_clear_allow_override);
+err_override_control:
+	ice_vsi_update_security(uplink_vsi, ice_vsi_ctx_clear_allow_override);
+err_override_uplink:
+	ice_cfg_dflt_vsi(pi->hw, ctrl_vsi->idx, false, ICE_FLTR_TX);
+err_def_tx:
+	if (rule_added)
+		ice_clear_dflt_vsi(uplink_vsi->vsw);
+err_def_rx:
+	ice_fltr_add_mac_and_broadcast(uplink_vsi,
+				       uplink_vsi->port_info->mac.perm_addr,
+				       ICE_FWD_TO_VSI);
+	return -ENODEV;
+}
+
+/**
+ * ice_eswitch_remap_ring - reconfigure ring of switchdev ctrl VSI
+ * @ring: pointer to ring
+ * @q_vector: pointer of q_vector which is connected with this ring
+ * @netdev: netdevice connected with this ring
+ */
+static void
+ice_eswitch_remap_ring(struct ice_ring *ring, struct ice_q_vector *q_vector,
+		       struct net_device *netdev)
+{
+	ring->q_vector = q_vector;
+	ring->next = NULL;
+	ring->netdev = netdev;
+}
+
+/**
+ * ice_eswitch_remap_rings_to_vectors - reconfigure rings of switchdev ctrl VSI
+ * @pf: pointer to PF struct
+ *
+ * In switchdev number of allocated Tx/Rx rings is equal.
+ *
+ * This function fills q_vectors structures associated with representor and
+ * move each ring pairs to port representor netdevs. Each port representor
+ * will have dedicated 1 Tx/Rx ring pair, so number of rings pair is equal to
+ * number of VFs.
+ */
+static void ice_eswitch_remap_rings_to_vectors(struct ice_pf *pf)
+{
+	struct ice_vsi *vsi = pf->switchdev.control_vsi;
+	int q_id;
+
+	ice_for_each_txq(vsi, q_id) {
+		struct ice_repr *repr = pf->vf[q_id].repr;
+		struct ice_q_vector *q_vector = repr->q_vector;
+		struct ice_ring *tx_ring = vsi->tx_rings[q_id];
+		struct ice_ring *rx_ring = vsi->rx_rings[q_id];
+
+		q_vector->vsi = vsi;
+		q_vector->reg_idx = vsi->q_vectors[0]->reg_idx;
+
+		q_vector->num_ring_tx = 1;
+		q_vector->tx.ring = tx_ring;
+		ice_eswitch_remap_ring(tx_ring, q_vector, repr->netdev);
+		/* In switchdev mode, from OS stack perspective, there is only
+		 * one queue for given netdev, so it needs to be indexed as 0.
+		 */
+		tx_ring->q_index = 0;
+
+		q_vector->num_ring_rx = 1;
+		q_vector->rx.ring = rx_ring;
+		ice_eswitch_remap_ring(rx_ring, q_vector, repr->netdev);
+	}
+}
+
+/**
+ * ice_eswitch_setup_reprs - configure port reprs to run in switchdev mode
+ * @pf: pointer to PF struct
+ */
+static int ice_eswitch_setup_reprs(struct ice_pf *pf)
+{
+	struct ice_vsi *ctrl_vsi = pf->switchdev.control_vsi;
+	int max_vsi_num = 0;
+	int i;
+
+	ice_for_each_vf(pf, i) {
+		struct ice_vsi *vsi = pf->vf[i].repr->src_vsi;
+		struct ice_vf *vf = &pf->vf[i];
+
+		ice_remove_vsi_fltr(&pf->hw, vsi->idx);
+		vf->repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX,
+						   GFP_KERNEL);
+		if (!vf->repr->dst) {
+			ice_fltr_add_mac_and_broadcast(vsi,
+						       vf->hw_lan_addr.addr,
+						       ICE_FWD_TO_VSI);
+			goto err;
+		}
+
+		if (ice_vsi_update_security(vsi, ice_vsi_ctx_clear_antispoof)) {
+			ice_fltr_add_mac_and_broadcast(vsi,
+						       vf->hw_lan_addr.addr,
+						       ICE_FWD_TO_VSI);
+			metadata_dst_free(vf->repr->dst);
+			goto err;
+		}
+
+		if (ice_vsi_add_vlan(vsi, 0, ICE_FWD_TO_VSI)) {
+			ice_fltr_add_mac_and_broadcast(vsi,
+						       vf->hw_lan_addr.addr,
+						       ICE_FWD_TO_VSI);
+			metadata_dst_free(vf->repr->dst);
+			ice_vsi_update_security(vsi, ice_vsi_ctx_set_antispoof);
+			goto err;
+		}
+
+		if (max_vsi_num < vsi->vsi_num)
+			max_vsi_num = vsi->vsi_num;
+
+		netif_napi_add(vf->repr->netdev, &vf->repr->q_vector->napi, ice_napi_poll,
+			       NAPI_POLL_WEIGHT);
+
+		netif_keep_dst(vf->repr->netdev);
+	}
+
+	kfree(ctrl_vsi->target_netdevs);
+
+	ctrl_vsi->target_netdevs = kcalloc(max_vsi_num + 1,
+					   sizeof(*ctrl_vsi->target_netdevs),
+					   GFP_KERNEL);
+	if (!ctrl_vsi->target_netdevs)
+		goto err;
+
+	ice_for_each_vf(pf, i) {
+		struct ice_repr *repr = pf->vf[i].repr;
+		struct ice_vsi *vsi = repr->src_vsi;
+		struct metadata_dst *dst;
+
+		ctrl_vsi->target_netdevs[vsi->vsi_num] = repr->netdev;
+
+		dst = repr->dst;
+		dst->u.port_info.port_id = vsi->vsi_num;
+		dst->u.port_info.lower_dev = repr->netdev;
+		ice_repr_set_traffic_vsi(repr, ctrl_vsi);
+	}
+
+	return 0;
+
+err:
+	for (i = i - 1; i >= 0; i--) {
+		struct ice_vsi *vsi = pf->vf[i].repr->src_vsi;
+		struct ice_vf *vf = &pf->vf[i];
+
+		ice_vsi_update_security(vsi, ice_vsi_ctx_set_antispoof);
+		metadata_dst_free(vf->repr->dst);
+		ice_fltr_add_mac_and_broadcast(vsi, vf->hw_lan_addr.addr,
+					       ICE_FWD_TO_VSI);
+	}
+
+	return -ENODEV;
+}
+
+/**
+ * ice_eswitch_release_reprs - clear PR VSIs configuration
+ * @pf: poiner to PF struct
+ * @ctrl_vsi: pointer to switchdev control VSI
+ */
+static void
+ice_eswitch_release_reprs(struct ice_pf *pf, struct ice_vsi *ctrl_vsi)
+{
+	int i;
+
+	kfree(ctrl_vsi->target_netdevs);
+	ice_for_each_vf(pf, i) {
+		struct ice_vsi *vsi = pf->vf[i].repr->src_vsi;
+		struct ice_vf *vf = &pf->vf[i];
+
+		ice_vsi_update_security(vsi, ice_vsi_ctx_set_antispoof);
+		metadata_dst_free(vf->repr->dst);
+		ice_fltr_add_mac_and_broadcast(vsi, vf->hw_lan_addr.addr,
+					       ICE_FWD_TO_VSI);
+
+		netif_napi_del(&vf->repr->q_vector->napi);
+	}
+}
+
+/**
+ * ice_eswitch_release_env - clear switchdev HW filters
+ * @pf: pointer to PF struct
+ *
+ * This function removes HW filters configuration specific for switchdev
+ * mode and restores default legacy mode settings.
+ */
+static void ice_eswitch_release_env(struct ice_pf *pf)
+{
+	struct ice_vsi *uplink_vsi = pf->switchdev.uplink_vsi;
+	struct ice_vsi *ctrl_vsi = pf->switchdev.control_vsi;
+
+	ice_vsi_update_security(ctrl_vsi, ice_vsi_ctx_clear_allow_override);
+	ice_vsi_update_security(uplink_vsi, ice_vsi_ctx_clear_allow_override);
+	ice_cfg_dflt_vsi(&pf->hw, ctrl_vsi->idx, false, ICE_FLTR_TX);
+	ice_clear_dflt_vsi(uplink_vsi->vsw);
+	ice_fltr_add_mac_and_broadcast(uplink_vsi,
+				       uplink_vsi->port_info->mac.perm_addr,
+				       ICE_FWD_TO_VSI);
+}
+
+/**
+ * ice_eswitch_vsi_setup - configure switchdev control VSI
+ * @pf: pointer to PF structure
+ * @pi: pointer to port_info structure
+ */
+static struct ice_vsi *
+ice_eswitch_vsi_setup(struct ice_pf *pf, struct ice_port_info *pi)
+{
+	return NULL;
+}
+
+/**
+ * ice_eswitch_napi_enable - enable NAPI for all port representors
+ * @pf: pointer to PF structure
+ */
+static void ice_eswitch_napi_enable(struct ice_pf *pf)
+{
+	int i;
+
+	ice_for_each_vf(pf, i)
+		napi_enable(&pf->vf[i].repr->q_vector->napi);
+}
+
+/**
+ * ice_eswitch_napi_disable - disable NAPI for all port representors
+ * @pf: pointer to PF structure
+ */
+static void ice_eswitch_napi_disable(struct ice_pf *pf)
+{
+	int i;
+
+	ice_for_each_vf(pf, i)
+		napi_disable(&pf->vf[i].repr->q_vector->napi);
+}
+
+/**
+ * ice_eswitch_set_rxdid - configure rxdid on all Rx queues from VSI
+ * @vsi: VSI to setup rxdid on
+ * @rxdid: flex descriptor id
+ */
+static void ice_eswitch_set_rxdid(struct ice_vsi *vsi, u32 rxdid)
+{
+	struct ice_hw *hw = &vsi->back->hw;
+	int i;
+
+	ice_for_each_rxq(vsi, i) {
+		struct ice_ring *ring = vsi->rx_rings[i];
+		u16 pf_q = vsi->rxq_map[ring->q_index];
+
+		ice_write_qrxflxp_cntxt(hw, pf_q, rxdid, 0x3, true);
+	}
+}
+
+/**
+ * ice_eswitch_enable_switchdev - configure eswitch in switchdev mode
+ * @pf: pointer to PF structure
+ */
+static int ice_eswitch_enable_switchdev(struct ice_pf *pf)
+{
+	struct ice_vsi *ctrl_vsi;
+
+	pf->switchdev.control_vsi = ice_eswitch_vsi_setup(pf, pf->hw.port_info);
+	if (!pf->switchdev.control_vsi)
+		return -ENODEV;
+
+	ctrl_vsi = pf->switchdev.control_vsi;
+	pf->switchdev.uplink_vsi = ice_get_main_vsi(pf);
+	if (!pf->switchdev.uplink_vsi)
+		goto err_vsi;
+
+	if (ice_eswitch_setup_env(pf))
+		goto err_vsi;
+
+	if (ice_repr_add_for_all_vfs(pf))
+		goto err_repr_add;
+
+	if (ice_eswitch_setup_reprs(pf))
+		goto err_setup_reprs;
+
+	ice_eswitch_remap_rings_to_vectors(pf);
+
+	if (ice_vsi_open(ctrl_vsi))
+		goto err_setup_reprs;
+
+	ice_eswitch_napi_enable(pf);
+
+	ice_eswitch_set_rxdid(ctrl_vsi, ICE_RXDID_FLEX_NIC_2);
+
+	return 0;
+
+err_setup_reprs:
+	ice_repr_rem_from_all_vfs(pf);
+err_repr_add:
+	ice_eswitch_release_env(pf);
+err_vsi:
+	ice_vsi_release(ctrl_vsi);
+	return -ENODEV;
+}
+
+/**
+ * ice_eswitch_disable_switchdev - disable switchdev resources
+ * @pf: pointer to PF structure
+ */
+static void ice_eswitch_disable_switchdev(struct ice_pf *pf)
+{
+	struct ice_vsi *ctrl_vsi = pf->switchdev.control_vsi;
+
+	ice_eswitch_napi_disable(pf);
+	ice_eswitch_release_env(pf);
+	ice_eswitch_release_reprs(pf, ctrl_vsi);
+	ice_vsi_release(ctrl_vsi);
+	ice_repr_rem_from_all_vfs(pf);
+}
+
+/**
  * ice_eswitch_mode_set - set new eswitch mode
  * @devlink: pointer to devlink structure
  * @mode: eswitch mode to switch to
@@ -60,3 +422,35 @@ int ice_eswitch_mode_get(struct devlink *devlink, u16 *mode)
 	*mode = pf->eswitch_mode;
 	return 0;
 }
+
+/**
+ * ice_eswitch_release - cleanup eswitch
+ * @pf: pointer to PF structure
+ */
+void ice_eswitch_release(struct ice_pf *pf)
+{
+	if (pf->eswitch_mode == DEVLINK_ESWITCH_MODE_LEGACY)
+		return;
+
+	ice_eswitch_disable_switchdev(pf);
+	pf->switchdev.is_running = false;
+}
+
+/**
+ * ice_eswitch_configure - configure eswitch
+ * @pf: pointer to PF structure
+ */
+int ice_eswitch_configure(struct ice_pf *pf)
+{
+	int status;
+
+	if (pf->eswitch_mode == DEVLINK_ESWITCH_MODE_LEGACY || pf->switchdev.is_running)
+		return 0;
+
+	status = ice_eswitch_enable_switchdev(pf);
+	if (status)
+		return status;
+
+	pf->switchdev.is_running = true;
+	return 0;
+}