From: Amritha Nambiar <amritha.nambiar@intel.com>
Date: Tue, 8 Feb 2022 17:06:05 -0800
Subject: ice: Add support for outer dest MAC for ADQ tunnels
Patch-mainline: v5.18-rc1
Git-commit: 02ddec1986ff0b8de20094aae2fa5b8f8ee7e1a3
References: jsc#PED-376

TC flower does not support matching on user specified
outer MAC address for tunnels. For ADQ tunnels, the driver
adds outer destination MAC address as lower netdev's
active unicast MAC address to filter out packets with
unrelated MAC address being delivered to ADQ VSIs.

Example:
- create tunnel device
ip l add $VXLAN_DEV type vxlan id $VXLAN_VNI dstport $VXLAN_PORT \
dev $PF
- add TC filter (in ADQ mode)

$tc filter add dev $VXLAN_DEV protocol ip parent ffff: flower \
 dst_ip $INNER_DST_IP ip_proto tcp dst_port $INNER_DST_PORT \
 enc_key_id $VXLAN_VNI hw_tc $ADQ_TC

Note: Filters with wild-card tunnel ID (when user does not
specify tunnel key) are also supported.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
Tested-by: Bharathi Sreenivas <bharathi.sreenivas@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ice/ice_tc_lib.c |   32 ++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c
@@ -24,6 +24,9 @@ ice_tc_count_lkups(u32 flags, struct ice
 	if (flags & ICE_TC_FLWR_FIELD_TENANT_ID)
 		lkups_cnt++;
 
+	if (flags & ICE_TC_FLWR_FIELD_ENC_DST_MAC)
+		lkups_cnt++;
+
 	if (flags & (ICE_TC_FLWR_FIELD_ENC_SRC_IPV4 |
 		     ICE_TC_FLWR_FIELD_ENC_DEST_IPV4 |
 		     ICE_TC_FLWR_FIELD_ENC_SRC_IPV6 |
@@ -148,6 +151,15 @@ ice_tc_fill_tunnel_outer(u32 flags, stru
 		}
 	}
 
+	if (flags & ICE_TC_FLWR_FIELD_ENC_DST_MAC) {
+		list[i].type = ice_proto_type_from_mac(false);
+		ether_addr_copy(list[i].h_u.eth_hdr.dst_addr,
+				hdr->l2_key.dst_mac);
+		ether_addr_copy(list[i].m_u.eth_hdr.dst_addr,
+				hdr->l2_mask.dst_mac);
+		i++;
+	}
+
 	if (flags & (ICE_TC_FLWR_FIELD_ENC_SRC_IPV4 |
 		     ICE_TC_FLWR_FIELD_ENC_DEST_IPV4)) {
 		list[i].type = ice_proto_type_from_ipv4(false);
@@ -1064,12 +1076,24 @@ ice_handle_tclass_action(struct ice_vsi
 	 * this code won't do anything
 	 * 2. For non-tunnel, if user didn't specify MAC address, add implicit
 	 * dest MAC to be lower netdev's active unicast MAC address
+	 * 3. For tunnel,  as of now TC-filter through flower classifier doesn't
+	 * have provision for user to specify outer DMAC, hence driver to
+	 * implicitly add outer dest MAC to be lower netdev's active unicast
+	 * MAC address.
 	 */
-	if (!(fltr->flags & ICE_TC_FLWR_FIELD_DST_MAC)) {
-		ether_addr_copy(fltr->outer_headers.l2_key.dst_mac,
-				main_vsi->netdev->dev_addr);
-		eth_broadcast_addr(fltr->outer_headers.l2_mask.dst_mac);
+	if (fltr->tunnel_type != TNL_LAST &&
+	    !(fltr->flags & ICE_TC_FLWR_FIELD_ENC_DST_MAC))
+		fltr->flags |= ICE_TC_FLWR_FIELD_ENC_DST_MAC;
+
+	if (fltr->tunnel_type == TNL_LAST &&
+	    !(fltr->flags & ICE_TC_FLWR_FIELD_DST_MAC))
 		fltr->flags |= ICE_TC_FLWR_FIELD_DST_MAC;
+
+	if (fltr->flags & (ICE_TC_FLWR_FIELD_DST_MAC |
+			   ICE_TC_FLWR_FIELD_ENC_DST_MAC)) {
+		ether_addr_copy(fltr->outer_headers.l2_key.dst_mac,
+				vsi->netdev->dev_addr);
+		memset(fltr->outer_headers.l2_mask.dst_mac, 0xff, ETH_ALEN);
 	}
 
 	/* validate specified dest MAC address, make sure either it belongs to