[PATCH] net/ice: fix L2TPv2 outer MAC address in training packet

[Shaiq Wani <shaiq.wani@intel.com>]

flow rules with eth + l2tpv2 patterns fail to match because outer MACs
are written to the wrong location in the training packet.

The pre-scan loop does not detect L2TPV2, so tunnel_type is still 0
when the ETH item is parsed and MACs land in ext_data (inner) instead
of ext_data_outer. Also, ice_fdir_get_gen_prgm_pkt() uses the 'loc'
pointer (past the L2TPv2 header) instead of 'pkt' (Ethernet offset 0).

Detect L2TPV2 in pre-scan, and use 'pkt' for MAC insertion in all
four L2TPv2 training-packet cases.

Fixes: 733640dae75e ("net/ice: support L2TPv2 flow pattern matching")
Fixes: bf662653976e ("net/ice/base: support L2TPv2 flow rule")
Signed-off-by: Shaiq Wani <shaiq.wani@intel.com>
---
 drivers/net/intel/ice/base/ice_fdir.c   | 16 ++++++++--------
 drivers/net/intel/ice/ice_fdir_filter.c |  2 ++
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/intel/ice/base/ice_fdir.c b/drivers/net/intel/ice/base/ice_fdir.c
index 2c0cb99854..e1d8b65972 100644
--- a/drivers/net/intel/ice/base/ice_fdir.c
+++ b/drivers/net/intel/ice/base/ice_fdir.c
@@ -4599,16 +4599,16 @@ ice_fdir_get_gen_prgm_pkt(struct ice_hw *hw, struct ice_fdir_fltr *input,
 				     input->ip.v6.tc);
 		break;
 	case ICE_FLTR_PTYPE_NONF_IPV4_L2TPV2_CONTROL:
-		ice_pkt_insert_mac_addr(loc, input->ext_data_outer.dst_mac);
-		ice_pkt_insert_mac_addr(loc + ETH_ALEN,
+		ice_pkt_insert_mac_addr(pkt, input->ext_data_outer.dst_mac);
+		ice_pkt_insert_mac_addr(pkt + ETH_ALEN,
 					input->ext_data_outer.src_mac);
 		ice_pkt_insert_u16(loc, ICE_IPV4_L2TPV2_LEN_SESS_ID_OFFSET,
 				   input->l2tpv2_data.session_id);
 		break;
 	case ICE_FLTR_PTYPE_NONF_IPV4_L2TPV2:
 	case ICE_FLTR_PTYPE_NONF_IPV4_L2TPV2_PPP:
-		ice_pkt_insert_mac_addr(loc, input->ext_data_outer.dst_mac);
-		ice_pkt_insert_mac_addr(loc + ETH_ALEN,
+		ice_pkt_insert_mac_addr(pkt, input->ext_data_outer.dst_mac);
+		ice_pkt_insert_mac_addr(pkt + ETH_ALEN,
 					input->ext_data_outer.src_mac);
 		flags_version = BE16_TO_CPU(input->l2tpv2_data.flags_version);
 		if (flags_version & ICE_L2TPV2_FLAGS_LEN) {
@@ -4622,16 +4622,16 @@ ice_fdir_get_gen_prgm_pkt(struct ice_hw *hw, struct ice_fdir_fltr *input,
 		}
 		break;
 	case ICE_FLTR_PTYPE_NONF_IPV6_L2TPV2_CONTROL:
-		ice_pkt_insert_mac_addr(loc, input->ext_data_outer.dst_mac);
-		ice_pkt_insert_mac_addr(loc + ETH_ALEN,
+		ice_pkt_insert_mac_addr(pkt, input->ext_data_outer.dst_mac);
+		ice_pkt_insert_mac_addr(pkt + ETH_ALEN,
 					input->ext_data_outer.src_mac);
 		ice_pkt_insert_u16(loc, ICE_IPV6_L2TPV2_LEN_SESS_ID_OFFSET,
 				   input->l2tpv2_data.session_id);
 		break;
 	case ICE_FLTR_PTYPE_NONF_IPV6_L2TPV2:
 	case ICE_FLTR_PTYPE_NONF_IPV6_L2TPV2_PPP:
-		ice_pkt_insert_mac_addr(loc, input->ext_data_outer.dst_mac);
-		ice_pkt_insert_mac_addr(loc + ETH_ALEN,
+		ice_pkt_insert_mac_addr(pkt, input->ext_data_outer.dst_mac);
+		ice_pkt_insert_mac_addr(pkt + ETH_ALEN,
 					input->ext_data_outer.src_mac);
 		flags_version = BE16_TO_CPU(input->l2tpv2_data.flags_version);
 		if (flags_version & ICE_L2TPV2_FLAGS_LEN) {
diff --git a/drivers/net/intel/ice/ice_fdir_filter.c b/drivers/net/intel/ice/ice_fdir_filter.c
index 3522d77123..1cbc613020 100644
--- a/drivers/net/intel/ice/ice_fdir_filter.c
+++ b/drivers/net/intel/ice/ice_fdir_filter.c
@@ -1911,6 +1911,8 @@ ice_fdir_parse_pattern(__rte_unused struct ice_adapter *ad,
 	for (item = pattern; item->type != RTE_FLOW_ITEM_TYPE_END; item++) {
 		if (item->type == RTE_FLOW_ITEM_TYPE_VXLAN)
 			tunnel_type = ICE_FDIR_TUNNEL_TYPE_VXLAN;
+		if (item->type == RTE_FLOW_ITEM_TYPE_L2TPV2)
+			tunnel_type = ICE_FDIR_TUNNEL_TYPE_L2TPV2;
 		/* To align with shared code behavior, save gtpu outer
 		 * fields in inner struct.
 		 */
-- 
2.43.0