ice: Add support for packet mirroring using hardware in switchdev mode

Switchdev mode allows to add mirroring rules to mirror incoming and
outgoing packets to the interface's port representor. Previously, this was
available only using software functionality. Add possibility to offload
this functionality to the NIC hardware.

Introduce ICE_MIRROR_PACKET filter action to the ice_sw_fwd_act_type enum
to identify the desired action and pass it to the hardware as well as the
VSI to mirror.

Example of tc mirror command using hardware:
  tc filter add dev ens1f0np0 ingress protocol ip prio 1 flower src_mac
  b4:96:91:a5:c7:a7 skip_sw action mirred egress mirror dev eth1

ens1f0np0 - PF
b4:96:91:a5:c7:a7 - source MAC address
eth1 - PR of a VF to mirror to

Co-developed-by: Marcin Szycik <marcin.szycik@intel.com>
Signed-off-by: Marcin Szycik <marcin.szycik@intel.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Andrii Staikov <andrii.staikov@intel.com>
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
index 08d3bbf4b44c..b890410a2bc0 100644
--- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
@@ -689,6 +689,41 @@ ice_tc_setup_drop_action(struct net_device *filter_dev,
 	return 0;
 }
 
+static int ice_tc_setup_mirror_action(struct net_device *filter_dev,
+				      struct ice_tc_flower_fltr *fltr,
+				      struct net_device *target_dev)
+{
+	struct ice_repr *repr;
+
+	fltr->action.fltr_act = ICE_MIRROR_PACKET;
+
+	if (ice_is_port_repr_netdev(filter_dev) &&
+	    ice_is_port_repr_netdev(target_dev)) {
+		repr = ice_netdev_to_repr(target_dev);
+
+		fltr->dest_vsi = repr->src_vsi;
+		fltr->direction = ICE_ESWITCH_FLTR_EGRESS;
+	} else if (ice_is_port_repr_netdev(filter_dev) &&
+		   ice_tc_is_dev_uplink(target_dev)) {
+		repr = ice_netdev_to_repr(filter_dev);
+
+		fltr->dest_vsi = repr->src_vsi->back->eswitch.uplink_vsi;
+		fltr->direction = ICE_ESWITCH_FLTR_EGRESS;
+	} else if (ice_tc_is_dev_uplink(filter_dev) &&
+		   ice_is_port_repr_netdev(target_dev)) {
+		repr = ice_netdev_to_repr(target_dev);
+
+		fltr->dest_vsi = repr->src_vsi;
+		fltr->direction = ICE_ESWITCH_FLTR_INGRESS;
+	} else {
+		NL_SET_ERR_MSG_MOD(fltr->extack,
+				   "Unsupported netdevice in switchdev mode");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int ice_eswitch_tc_parse_action(struct net_device *filter_dev,
 				       struct ice_tc_flower_fltr *fltr,
 				       struct flow_action_entry *act)
@@ -710,6 +745,12 @@ static int ice_eswitch_tc_parse_action(struct net_device *filter_dev,
 
 		break;
 
+	case FLOW_ACTION_MIRRED:
+		err = ice_tc_setup_mirror_action(filter_dev, fltr, act->dev);
+		if (err)
+			return err;
+		break;
+
 	default:
 		NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported action in switchdev mode");
 		return -EINVAL;