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>

drivers/net/ethernet/intel/ice/ice.h

@@ -351,6 +351,8 @@ struct ice_vsi {
 	u16 num_xdp_txq;		 /* Used XDP queues */
 	u8 xdp_mapping_mode;		 /* ICE_MAP_MODE_[CONTIG|SCATTER] */
 
+	struct net_device **target_netdevs;
+
 	/* setup back reference, to which aggregator node this VSI
 	 * corresponds to
 	 */
@@ -410,6 +412,12 @@ enum ice_pf_flags {
 	ICE_PF_FLAGS_NBITS		/* must be last */
 };
 
+struct ice_switchdev_info {
+	struct ice_vsi *control_vsi;
+	struct ice_vsi *uplink_vsi;
+	bool is_running;
+};
+
 struct ice_agg_node {
 	u32 agg_id;
 #define ICE_MAX_VSIS_IN_AGG_NODE	64
@@ -508,6 +516,8 @@ struct ice_pf {
 	struct ice_link_default_override_tlv link_dflt_override;
 	struct ice_lag *lag; /* Link Aggregation information */
 
+	struct ice_switchdev_info switchdev;
+
 #define ICE_INVALID_AGG_NODE_ID		0
 #define ICE_PF_AGG_NODE_ID_START	1
 #define ICE_MAX_PF_AGG_NODES		32
@@ -617,6 +627,18 @@ static inline struct ice_vsi *ice_get_ctrl_vsi(struct ice_pf *pf)
 	return pf->vsi[pf->ctrl_vsi_idx];
 }
 
+/**
+ * ice_is_switchdev_running - check if switchdev is configured
+ * @pf: pointer to PF structure
+ *
+ * Returns true if eswitch mode is set to DEVLINK_ESWITCH_MODE_SWITCHDEV
+ * and switchdev is configured, false otherwise.
+ */
+static inline bool ice_is_switchdev_running(struct ice_pf *pf)
+{
+	return pf->switchdev.is_running;
+}
+
 /**
  * ice_set_sriov_cap - enable SRIOV in PF flags
  * @pf: PF struct
@@ -645,6 +667,7 @@ bool netif_is_ice(struct net_device *dev);
 int ice_vsi_setup_tx_rings(struct ice_vsi *vsi);
 int ice_vsi_setup_rx_rings(struct ice_vsi *vsi);
 int ice_vsi_open_ctrl(struct ice_vsi *vsi);
+int ice_vsi_open(struct ice_vsi *vsi);
 void ice_set_ethtool_ops(struct net_device *netdev);
 void ice_set_ethtool_safe_mode_ops(struct net_device *netdev);
 u16 ice_get_avail_txq_count(struct ice_pf *pf);