ice: Support GTP-U and GTP-C offload in switchdev

Add support for creating filters for GTP-U and GTP-C in switchdev mode. Add
support for parsing GTP-specific options (QFI and PDU type) and TEID.

By default, a filter for GTP-U will be added. To add a filter for GTP-C,
specify enc_dst_port = 2123, e.g.:

tc filter add dev $GTP0 ingress prio 1 flower enc_key_id 1337 \
enc_dst_port 2123 action mirred egress redirect dev $VF1_PR

Note: GTP-U with outer IPv6 offload is not supported yet.
Note: GTP-U with no payload offload is not supported yet.
Signed-off-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.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

@@ -51,6 +51,7 @@
 #include <net/gre.h>
 #include <net/udp_tunnel.h>
 #include <net/vxlan.h>
+#include <net/gtp.h>
 #if IS_ENABLED(CONFIG_DCB)
 #include <scsi/iscsi_proto.h>
 #endif /* CONFIG_DCB */

drivers/net/ethernet/intel/ice/ice_flex_pipe.c

@@ -1804,16 +1804,43 @@ static struct ice_buf_build *ice_pkg_buf_alloc(struct ice_hw *hw)
 	return bld;
 }
 
+static bool ice_is_gtp_u_profile(u16 prof_idx)
+{
+	return (prof_idx >= ICE_PROFID_IPV6_GTPU_TEID &&
+		prof_idx <= ICE_PROFID_IPV6_GTPU_IPV6_TCP_INNER) ||
+	       prof_idx == ICE_PROFID_IPV4_GTPU_TEID;
+}
+
+static bool ice_is_gtp_c_profile(u16 prof_idx)
+{
+	switch (prof_idx) {
+	case ICE_PROFID_IPV4_GTPC_TEID:
+	case ICE_PROFID_IPV4_GTPC_NO_TEID:
+	case ICE_PROFID_IPV6_GTPC_TEID:
+	case ICE_PROFID_IPV6_GTPC_NO_TEID:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /**
  * ice_get_sw_prof_type - determine switch profile type
  * @hw: pointer to the HW structure
  * @fv: pointer to the switch field vector
+ * @prof_idx: profile index to check
  */
 static enum ice_prof_type
-ice_get_sw_prof_type(struct ice_hw *hw, struct ice_fv *fv)
+ice_get_sw_prof_type(struct ice_hw *hw, struct ice_fv *fv, u32 prof_idx)
 {
 	u16 i;
 
+	if (ice_is_gtp_c_profile(prof_idx))
+		return ICE_PROF_TUN_GTPC;
+
+	if (ice_is_gtp_u_profile(prof_idx))
+		return ICE_PROF_TUN_GTPU;
+
 	for (i = 0; i < hw->blk[ICE_BLK_SW].es.fvw; i++) {
 		/* UDP tunnel will have UDP_OF protocol ID and VNI offset */
 		if (fv->ew[i].prot_id == (u8)ICE_PROT_UDP_OF &&
@@ -1860,7 +1887,7 @@ ice_get_sw_fv_bitmap(struct ice_hw *hw, enum ice_prof_type req_profs,
 
 		if (fv) {
 			/* Determine field vector type */
-			prof_type = ice_get_sw_prof_type(hw, fv);
+			prof_type = ice_get_sw_prof_type(hw, fv, offset);
 
 			if (req_profs & prof_type)
 				set_bit((u16)offset, bm);

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

@@ -417,6 +417,8 @@ enum ice_tunnel_type {
 	TNL_VXLAN = 0,
 	TNL_GENEVE,
 	TNL_GRETAP,
+	TNL_GTPC,
+	TNL_GTPU,
 	__TNL_TYPE_CNT,
 	TNL_LAST = 0xFF,
 	TNL_ALL = 0xFF,
@@ -673,7 +675,9 @@ enum ice_prof_type {
 	ICE_PROF_NON_TUN = 0x1,
 	ICE_PROF_TUN_UDP = 0x2,
 	ICE_PROF_TUN_GRE = 0x4,
-	ICE_PROF_TUN_ALL = 0x6,
+	ICE_PROF_TUN_GTPU = 0x8,
+	ICE_PROF_TUN_GTPC = 0x10,
+	ICE_PROF_TUN_ALL = 0x1E,
 	ICE_PROF_ALL = 0xFF,
 };
 

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

@@ -41,6 +41,8 @@ enum ice_protocol_type {
 	ICE_VXLAN,
 	ICE_GENEVE,
 	ICE_NVGRE,
+	ICE_GTP,
+	ICE_GTP_NO_PAY,
 	ICE_VXLAN_GPE,
 	ICE_SCTP_IL,
 	ICE_PROTOCOL_LAST
@@ -52,6 +54,8 @@ enum ice_sw_tunnel_type {
 	ICE_SW_TUN_VXLAN,
 	ICE_SW_TUN_GENEVE,
 	ICE_SW_TUN_NVGRE,
+	ICE_SW_TUN_GTPU,
+	ICE_SW_TUN_GTPC,
 	ICE_ALL_TUNNELS /* All tunnel types including NVGRE */
 };
 
@@ -182,6 +186,20 @@ struct ice_udp_tnl_hdr {
 	__be32 vni;     /* only use lower 24-bits */
 };
 
+struct ice_udp_gtp_hdr {
+	u8 flags;
+	u8 msg_type;
+	__be16 rsrvd_len;
+	__be32 teid;
+	__be16 rsrvd_seq_nbr;
+	u8 rsrvd_n_pdu_nbr;
+	u8 rsrvd_next_ext;
+	u8 rsvrd_ext_len;
+	u8 pdu_type;
+	u8 qfi;
+	u8 rsvrd;
+};
+
 struct ice_nvgre_hdr {
 	__be16 flags;
 	__be16 protocol;
@@ -198,6 +216,7 @@ union ice_prot_hdr {
 	struct ice_sctp_hdr sctp_hdr;
 	struct ice_udp_tnl_hdr tnl_hdr;
 	struct ice_nvgre_hdr nvgre_hdr;
+	struct ice_udp_gtp_hdr gtp_hdr;
 };
 
 /* This is mapping table entry that maps every word within a given protocol

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

@@ -14,6 +14,15 @@
 #define ICE_VSI_INVAL_ID 0xffff
 #define ICE_INVAL_Q_HANDLE 0xFFFF
 
+/* Switch Profile IDs for Profile related switch rules */
+#define ICE_PROFID_IPV4_GTPC_TEID			41
+#define ICE_PROFID_IPV4_GTPC_NO_TEID			42
+#define ICE_PROFID_IPV4_GTPU_TEID			43
+#define ICE_PROFID_IPV6_GTPC_TEID			44
+#define ICE_PROFID_IPV6_GTPC_NO_TEID			45
+#define ICE_PROFID_IPV6_GTPU_TEID			46
+#define ICE_PROFID_IPV6_GTPU_IPV6_TCP_INNER		70
+
 #define ICE_SW_RULE_RX_TX_NO_HDR_SIZE \
 	(offsetof(struct ice_aqc_sw_rules_elem, pdata.lkup_tx_rx.hdr))
 

drivers/net/ethernet/intel/ice/ice_tc_lib.c

@@ -27,6 +27,9 @@ ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
 	if (flags & ICE_TC_FLWR_FIELD_ENC_DST_MAC)
 		lkups_cnt++;
 
+	if (flags & ICE_TC_FLWR_FIELD_ENC_OPTS)
+		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 |
@@ -102,6 +105,11 @@ ice_proto_type_from_tunnel(enum ice_tunnel_type type)
 		return ICE_GENEVE;
 	case TNL_GRETAP:
 		return ICE_NVGRE;
+	case TNL_GTPU:
+		/* NO_PAY profiles will not work with GTP-U */
+		return ICE_GTP;
+	case TNL_GTPC:
+		return ICE_GTP_NO_PAY;
 	default:
 		return 0;
 	}
@@ -117,6 +125,10 @@ ice_sw_type_from_tunnel(enum ice_tunnel_type type)
 		return ICE_SW_TUN_GENEVE;
 	case TNL_GRETAP:
 		return ICE_SW_TUN_NVGRE;
+	case TNL_GTPU:
+		return ICE_SW_TUN_GTPU;
+	case TNL_GTPC:
+		return ICE_SW_TUN_GTPC;
 	default:
 		return ICE_NON_TUN;
 	}
@@ -143,7 +155,15 @@ ice_tc_fill_tunnel_outer(u32 flags, struct ice_tc_flower_fltr *fltr,
 			break;
 		case TNL_GRETAP:
 			list[i].h_u.nvgre_hdr.tni_flow = fltr->tenant_id;
-			memcpy(&list[i].m_u.nvgre_hdr.tni_flow, "\xff\xff\xff\xff", 4);
+			memcpy(&list[i].m_u.nvgre_hdr.tni_flow,
+			       "\xff\xff\xff\xff", 4);
+			i++;
+			break;
+		case TNL_GTPC:
+		case TNL_GTPU:
+			list[i].h_u.gtp_hdr.teid = fltr->tenant_id;
+			memcpy(&list[i].m_u.gtp_hdr.teid,
+			       "\xff\xff\xff\xff", 4);
 			i++;
 			break;
 		default:
@@ -160,6 +180,24 @@ ice_tc_fill_tunnel_outer(u32 flags, struct ice_tc_flower_fltr *fltr,
 		i++;
 	}
 
+	if (flags & ICE_TC_FLWR_FIELD_ENC_OPTS &&
+	    (fltr->tunnel_type == TNL_GTPU || fltr->tunnel_type == TNL_GTPC)) {
+		list[i].type = ice_proto_type_from_tunnel(fltr->tunnel_type);
+
+		if (fltr->gtp_pdu_info_masks.pdu_type) {
+			list[i].h_u.gtp_hdr.pdu_type =
+				fltr->gtp_pdu_info_keys.pdu_type << 4;
+			memcpy(&list[i].m_u.gtp_hdr.pdu_type, "\xf0", 1);
+		}
+
+		if (fltr->gtp_pdu_info_masks.qfi) {
+			list[i].h_u.gtp_hdr.qfi = fltr->gtp_pdu_info_keys.qfi;
+			memcpy(&list[i].m_u.gtp_hdr.qfi, "\x3f", 1);
+		}
+
+		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);
@@ -361,6 +399,12 @@ static int ice_tc_tun_get_type(struct net_device *tunnel_dev)
 	if (netif_is_gretap(tunnel_dev) ||
 	    netif_is_ip6gretap(tunnel_dev))
 		return TNL_GRETAP;
+
+	/* Assume GTP-U by default in case of GTP netdev.
+	 * GTP-C may be selected later, based on enc_dst_port.
+	 */
+	if (netif_is_gtp(tunnel_dev))
+		return TNL_GTPU;
 	return TNL_LAST;
 }
 
@@ -760,6 +804,40 @@ ice_get_tunnel_device(struct net_device *dev, struct flow_rule *rule)
 	return NULL;
 }
 
+/**
+ * ice_parse_gtp_type - Sets GTP tunnel type to GTP-U or GTP-C
+ * @match: Flow match structure
+ * @fltr: Pointer to filter structure
+ *
+ * GTP-C/GTP-U is selected based on destination port number (enc_dst_port).
+ * Before calling this funtcion, fltr->tunnel_type should be set to TNL_GTPU,
+ * therefore making GTP-U the default choice (when destination port number is
+ * not specified).
+ */
+static int
+ice_parse_gtp_type(struct flow_match_ports match,
+		   struct ice_tc_flower_fltr *fltr)
+{
+	u16 dst_port;
+
+	if (match.key->dst) {
+		dst_port = be16_to_cpu(match.key->dst);
+
+		switch (dst_port) {
+		case 2152:
+			break;
+		case 2123:
+			fltr->tunnel_type = TNL_GTPC;
+			break;
+		default:
+			NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported GTP port number");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static int
 ice_parse_tunnel_attr(struct net_device *dev, struct flow_rule *rule,
 		      struct ice_tc_flower_fltr *fltr)
@@ -815,8 +893,28 @@ ice_parse_tunnel_attr(struct net_device *dev, struct flow_rule *rule,
 		struct flow_match_ports match;
 
 		flow_rule_match_enc_ports(rule, &match);
-		if (ice_tc_set_port(match, fltr, headers, true))
-			return -EINVAL;
+
+		if (fltr->tunnel_type != TNL_GTPU) {
+			if (ice_tc_set_port(match, fltr, headers, true))
+				return -EINVAL;
+		} else {
+			if (ice_parse_gtp_type(match, fltr))
+				return -EINVAL;
+		}
+	}
+
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS)) {
+		struct flow_match_enc_opts match;
+
+		flow_rule_match_enc_opts(rule, &match);
+
+		memcpy(&fltr->gtp_pdu_info_keys, &match.key->data[0],
+		       sizeof(struct gtp_pdu_session_info));
+
+		memcpy(&fltr->gtp_pdu_info_masks, &match.mask->data[0],
+		       sizeof(struct gtp_pdu_session_info));
+
+		fltr->flags |= ICE_TC_FLWR_FIELD_ENC_OPTS;
 	}
 
 	return 0;
@@ -854,6 +952,7 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) |
+	      BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IP) |
 	      BIT(FLOW_DISSECTOR_KEY_PORTS))) {
 		NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported key used");

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

@@ -22,6 +22,7 @@
 #define ICE_TC_FLWR_FIELD_ENC_SRC_L4_PORT	BIT(15)
 #define ICE_TC_FLWR_FIELD_ENC_DST_MAC		BIT(16)
 #define ICE_TC_FLWR_FIELD_ETH_TYPE_ID		BIT(17)
+#define ICE_TC_FLWR_FIELD_ENC_OPTS		BIT(18)
 
 #define ICE_TC_FLOWER_MASK_32   0xFFFFFFFF
 
@@ -119,6 +120,8 @@ struct ice_tc_flower_fltr {
 	struct ice_tc_flower_lyr_2_4_hdrs inner_headers;
 	struct ice_vsi *src_vsi;
 	__be32 tenant_id;
+	struct gtp_pdu_session_info gtp_pdu_info_keys;
+	struct gtp_pdu_session_info gtp_pdu_info_masks;
 	u32 flags;
 	u8 tunnel_type;
 	struct ice_tc_flower_action	action;