ice: Add support for PPPoE hardware offload

Add support for creating PPPoE filters in switchdev mode. Add support
for parsing PPPoE and PPP-specific tc options: pppoe_sid and ppp_proto.

Example filter:
tc filter add dev $PF1 ingress protocol ppp_ses prio 1 flower pppoe_sid \
    1234 ppp_proto ip skip_sw action mirred egress redirect dev $VF1_PR

Changes in iproute2 are required to use the new fields.

ICE COMMS DDP package is required to create a filter as it contains PPPoE
profiles. Added a warning message when loaded DDP package does not contain
required profiles.

Signed-off-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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

@@ -52,6 +52,7 @@
 #include <net/udp_tunnel.h>
 #include <net/vxlan.h>
 #include <net/gtp.h>
+#include <linux/ppp_defs.h>
 #include "ice_devids.h"
 #include "ice_type.h"
 #include "ice_txrx.h"

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

@@ -1964,8 +1964,11 @@ ice_get_sw_fv_list(struct ice_hw *hw, struct ice_prot_lkup_ext *lkups,
 			}
 		}
 	} while (fv);
-	if (list_empty(fv_list))
+	if (list_empty(fv_list)) {
+		dev_warn(ice_hw_to_dev(hw), "Required profiles not found in currently loaded DDP package");
 		return -EIO;
+	}
+
 	return 0;
 
 err:

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

@@ -43,6 +43,7 @@ enum ice_protocol_type {
 	ICE_NVGRE,
 	ICE_GTP,
 	ICE_GTP_NO_PAY,
+	ICE_PPPOE,
 	ICE_VLAN_EX,
 	ICE_VLAN_IN,
 	ICE_VXLAN_GPE,
@@ -109,6 +110,7 @@ enum ice_prot_id {
 #define ICE_TCP_IL_HW		49
 #define ICE_UDP_ILOS_HW		53
 #define ICE_GRE_OF_HW		64
+#define ICE_PPPOE_HW		103
 
 #define ICE_UDP_OF_HW	52 /* UDP Tunnels */
 #define ICE_META_DATA_ID_HW 255 /* this is used for tunnel and VLAN type */
@@ -207,6 +209,14 @@ struct ice_udp_gtp_hdr {
 	u8 rsvrd;
 };
 
+struct ice_pppoe_hdr {
+	u8 rsrvd_ver_type;
+	u8 rsrvd_code;
+	__be16 session_id;
+	__be16 length;
+	__be16 ppp_prot_id; /* control and data only */
+};
+
 struct ice_nvgre_hdr {
 	__be16 flags;
 	__be16 protocol;
@@ -224,6 +234,7 @@ union ice_prot_hdr {
 	struct ice_udp_tnl_hdr tnl_hdr;
 	struct ice_nvgre_hdr nvgre_hdr;
 	struct ice_udp_gtp_hdr gtp_hdr;
+	struct ice_pppoe_hdr pppoe_hdr;
 };
 
 /* This is mapping table entry that maps every word within a given protocol

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

@@ -41,6 +41,7 @@ enum {
 	ICE_PKT_INNER_UDP	= BIT(7),
 	ICE_PKT_GTP_NOPAY	= BIT(8),
 	ICE_PKT_KMALLOC		= BIT(9),
+	ICE_PKT_PPPOE		= BIT(10),
 };
 
 struct ice_dummy_pkt_offsets {
@@ -1109,6 +1110,154 @@ ICE_DECLARE_PKT_TEMPLATE(ipv6_gtp) = {
 	0x00, 0x00,
 };
 
+ICE_DECLARE_PKT_OFFSETS(pppoe_ipv4_tcp) = {
+	{ ICE_MAC_OFOS,		0 },
+	{ ICE_ETYPE_OL,		12 },
+	{ ICE_PPPOE,		14 },
+	{ ICE_IPV4_OFOS,	22 },
+	{ ICE_TCP_IL,		42 },
+	{ ICE_PROTOCOL_LAST,	0 },
+};
+
+ICE_DECLARE_PKT_TEMPLATE(pppoe_ipv4_tcp) = {
+	0x00, 0x00, 0x00, 0x00, /* ICE_MAC_OFOS 0 */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x88, 0x64,		/* ICE_ETYPE_OL 12 */
+
+	0x11, 0x00, 0x00, 0x00, /* ICE_PPPOE 14 */
+	0x00, 0x16,
+
+	0x00, 0x21,		/* PPP Link Layer 20 */
+
+	0x45, 0x00, 0x00, 0x28, /* ICE_IPV4_OFOS 22 */
+	0x00, 0x01, 0x00, 0x00,
+	0x00, 0x06, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x00, 0x00, 0x00, 0x00, /* ICE_TCP_IL 42 */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x50, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x00, 0x00,		/* 2 bytes for 4 bytes alignment */
+};
+
+ICE_DECLARE_PKT_OFFSETS(pppoe_ipv4_udp) = {
+	{ ICE_MAC_OFOS,		0 },
+	{ ICE_ETYPE_OL,		12 },
+	{ ICE_PPPOE,		14 },
+	{ ICE_IPV4_OFOS,	22 },
+	{ ICE_UDP_ILOS,		42 },
+	{ ICE_PROTOCOL_LAST,	0 },
+};
+
+ICE_DECLARE_PKT_TEMPLATE(pppoe_ipv4_udp) = {
+	0x00, 0x00, 0x00, 0x00, /* ICE_MAC_OFOS 0 */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x88, 0x64,		/* ICE_ETYPE_OL 12 */
+
+	0x11, 0x00, 0x00, 0x00, /* ICE_PPPOE 14 */
+	0x00, 0x16,
+
+	0x00, 0x21,		/* PPP Link Layer 20 */
+
+	0x45, 0x00, 0x00, 0x1c, /* ICE_IPV4_OFOS 22 */
+	0x00, 0x01, 0x00, 0x00,
+	0x00, 0x11, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x00, 0x00, 0x00, 0x00, /* ICE_UDP_ILOS 42 */
+	0x00, 0x08, 0x00, 0x00,
+
+	0x00, 0x00,		/* 2 bytes for 4 bytes alignment */
+};
+
+ICE_DECLARE_PKT_OFFSETS(pppoe_ipv6_tcp) = {
+	{ ICE_MAC_OFOS,		0 },
+	{ ICE_ETYPE_OL,		12 },
+	{ ICE_PPPOE,		14 },
+	{ ICE_IPV6_OFOS,	22 },
+	{ ICE_TCP_IL,		62 },
+	{ ICE_PROTOCOL_LAST,	0 },
+};
+
+ICE_DECLARE_PKT_TEMPLATE(pppoe_ipv6_tcp) = {
+	0x00, 0x00, 0x00, 0x00, /* ICE_MAC_OFOS 0 */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x88, 0x64,		/* ICE_ETYPE_OL 12 */
+
+	0x11, 0x00, 0x00, 0x00, /* ICE_PPPOE 14 */
+	0x00, 0x2a,
+
+	0x00, 0x57,		/* PPP Link Layer 20 */
+
+	0x60, 0x00, 0x00, 0x00, /* ICE_IPV6_OFOS 22 */
+	0x00, 0x14, 0x06, 0x00, /* Next header is TCP */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x00, 0x00, 0x00, 0x00, /* ICE_TCP_IL 62 */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x50, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x00, 0x00,		/* 2 bytes for 4 bytes alignment */
+};
+
+ICE_DECLARE_PKT_OFFSETS(pppoe_ipv6_udp) = {
+	{ ICE_MAC_OFOS,		0 },
+	{ ICE_ETYPE_OL,		12 },
+	{ ICE_PPPOE,		14 },
+	{ ICE_IPV6_OFOS,	22 },
+	{ ICE_UDP_ILOS,		62 },
+	{ ICE_PROTOCOL_LAST,	0 },
+};
+
+ICE_DECLARE_PKT_TEMPLATE(pppoe_ipv6_udp) = {
+	0x00, 0x00, 0x00, 0x00, /* ICE_MAC_OFOS 0 */
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x88, 0x64,		/* ICE_ETYPE_OL 12 */
+
+	0x11, 0x00, 0x00, 0x00, /* ICE_PPPOE 14 */
+	0x00, 0x2a,
+
+	0x00, 0x57,		/* PPP Link Layer 20 */
+
+	0x60, 0x00, 0x00, 0x00, /* ICE_IPV6_OFOS 22 */
+	0x00, 0x08, 0x11, 0x00, /* Next header UDP*/
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+
+	0x00, 0x00, 0x00, 0x00, /* ICE_UDP_ILOS 62 */
+	0x00, 0x08, 0x00, 0x00,
+
+	0x00, 0x00,		/* 2 bytes for 4 bytes alignment */
+};
+
 static const struct ice_dummy_pkt_profile ice_dummy_pkt_profiles[] = {
 	ICE_PKT_PROFILE(ipv6_gtp, ICE_PKT_TUN_GTPU | ICE_PKT_OUTER_IPV6 |
 				  ICE_PKT_GTP_NOPAY),
@@ -1135,6 +1284,11 @@ static const struct ice_dummy_pkt_profile ice_dummy_pkt_profiles[] = {
 	ICE_PKT_PROFILE(ipv4_gtpu_ipv4_tcp, ICE_PKT_TUN_GTPU),
 	ICE_PKT_PROFILE(ipv6_gtp, ICE_PKT_TUN_GTPC | ICE_PKT_OUTER_IPV6),
 	ICE_PKT_PROFILE(ipv4_gtpu_ipv4, ICE_PKT_TUN_GTPC),
+	ICE_PKT_PROFILE(pppoe_ipv6_udp, ICE_PKT_PPPOE | ICE_PKT_OUTER_IPV6 |
+					ICE_PKT_INNER_UDP),
+	ICE_PKT_PROFILE(pppoe_ipv6_tcp, ICE_PKT_PPPOE | ICE_PKT_OUTER_IPV6),
+	ICE_PKT_PROFILE(pppoe_ipv4_udp, ICE_PKT_PPPOE | ICE_PKT_INNER_UDP),
+	ICE_PKT_PROFILE(pppoe_ipv4_tcp, ICE_PKT_PPPOE),
 	ICE_PKT_PROFILE(gre_ipv6_tcp, ICE_PKT_TUN_NVGRE | ICE_PKT_INNER_IPV6 |
 				      ICE_PKT_INNER_TCP),
 	ICE_PKT_PROFILE(gre_tcp, ICE_PKT_TUN_NVGRE | ICE_PKT_INNER_TCP),
@@ -4480,6 +4634,7 @@ static const struct ice_prot_ext_tbl_entry ice_prot_ext[ICE_PROTOCOL_LAST] = {
 	{ ICE_NVGRE,		{ 0, 2, 4, 6 } },
 	{ ICE_GTP,		{ 8, 10, 12, 14, 16, 18, 20, 22 } },
 	{ ICE_GTP_NO_PAY,	{ 8, 10, 12, 14 } },
+	{ ICE_PPPOE,		{ 0, 2, 4, 6 } },
 	{ ICE_VLAN_EX,          { 2, 0 } },
 	{ ICE_VLAN_IN,          { 2, 0 } },
 };
@@ -4502,6 +4657,7 @@ static struct ice_protocol_entry ice_prot_id_tbl[ICE_PROTOCOL_LAST] = {
 	{ ICE_NVGRE,		ICE_GRE_OF_HW },
 	{ ICE_GTP,		ICE_UDP_OF_HW },
 	{ ICE_GTP_NO_PAY,	ICE_UDP_ILOS_HW },
+	{ ICE_PPPOE,		ICE_PPPOE_HW },
 	{ ICE_VLAN_EX,          ICE_VLAN_OF_HW },
 	{ ICE_VLAN_IN,          ICE_VLAN_OL_HW },
 };
@@ -5580,6 +5736,12 @@ ice_find_dummy_packet(struct ice_adv_lkup_elem *lkups, u16 lkups_cnt,
 			match |= ICE_PKT_INNER_IPV6;
 		else if (lkups[i].type == ICE_GTP_NO_PAY)
 			match |= ICE_PKT_GTP_NOPAY;
+		else if (lkups[i].type == ICE_PPPOE) {
+			match |= ICE_PKT_PPPOE;
+			if (lkups[i].h_u.pppoe_hdr.ppp_prot_id ==
+			    htons(PPP_IPV6))
+				match |= ICE_PKT_OUTER_IPV6;
+		}
 	}
 
 	while (ret->match && (match & ret->match) != ret->match)
@@ -5677,6 +5839,9 @@ ice_fill_adv_dummy_packet(struct ice_adv_lkup_elem *lkups, u16 lkups_cnt,
 		case ICE_GTP:
 			len = sizeof(struct ice_udp_gtp_hdr);
 			break;
+		case ICE_PPPOE:
+			len = sizeof(struct ice_pppoe_hdr);
+			break;
 		default:
 			return -EINVAL;
 		}

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

@@ -54,6 +54,11 @@ ice_tc_count_lkups(u32 flags, struct ice_tc_flower_lyr_2_4_hdrs *headers,
 	if (flags & ICE_TC_FLWR_FIELD_CVLAN)
 		lkups_cnt++;
 
+	/* are PPPoE options specified? */
+	if (flags & (ICE_TC_FLWR_FIELD_PPPOE_SESSID |
+		     ICE_TC_FLWR_FIELD_PPP_PROTO))
+		lkups_cnt++;
+
 	/* are IPv[4|6] fields specified? */
 	if (flags & (ICE_TC_FLWR_FIELD_DEST_IPV4 | ICE_TC_FLWR_FIELD_SRC_IPV4 |
 		     ICE_TC_FLWR_FIELD_DEST_IPV6 | ICE_TC_FLWR_FIELD_SRC_IPV6))
@@ -350,6 +355,28 @@ ice_tc_fill_rules(struct ice_hw *hw, u32 flags,
 		i++;
 	}
 
+	if (flags & (ICE_TC_FLWR_FIELD_PPPOE_SESSID |
+		     ICE_TC_FLWR_FIELD_PPP_PROTO)) {
+		struct ice_pppoe_hdr *vals, *masks;
+
+		vals = &list[i].h_u.pppoe_hdr;
+		masks = &list[i].m_u.pppoe_hdr;
+
+		list[i].type = ICE_PPPOE;
+
+		if (flags & ICE_TC_FLWR_FIELD_PPPOE_SESSID) {
+			vals->session_id = headers->pppoe_hdr.session_id;
+			masks->session_id = cpu_to_be16(0xFFFF);
+		}
+
+		if (flags & ICE_TC_FLWR_FIELD_PPP_PROTO) {
+			vals->ppp_prot_id = headers->pppoe_hdr.ppp_proto;
+			masks->ppp_prot_id = cpu_to_be16(0xFFFF);
+		}
+
+		i++;
+	}
+
 	/* copy L3 (IPv[4|6]: src, dest) address */
 	if (flags & (ICE_TC_FLWR_FIELD_DEST_IPV4 |
 		     ICE_TC_FLWR_FIELD_SRC_IPV4)) {
@@ -693,6 +720,31 @@ ice_add_tc_flower_adv_fltr(struct ice_vsi *vsi,
 	return ret;
 }
 
+/**
+ * ice_tc_set_pppoe - Parse PPPoE fields from TC flower filter
+ * @match: Pointer to flow match structure
+ * @fltr: Pointer to filter structure
+ * @headers: Pointer to outer header fields
+ * @returns PPP protocol used in filter (ppp_ses or ppp_disc)
+ */
+static u16
+ice_tc_set_pppoe(struct flow_match_pppoe *match,
+		 struct ice_tc_flower_fltr *fltr,
+		 struct ice_tc_flower_lyr_2_4_hdrs *headers)
+{
+	if (match->mask->session_id) {
+		fltr->flags |= ICE_TC_FLWR_FIELD_PPPOE_SESSID;
+		headers->pppoe_hdr.session_id = match->key->session_id;
+	}
+
+	if (match->mask->ppp_proto) {
+		fltr->flags |= ICE_TC_FLWR_FIELD_PPP_PROTO;
+		headers->pppoe_hdr.ppp_proto = match->key->ppp_proto;
+	}
+
+	return be16_to_cpu(match->key->type);
+}
+
 /**
  * ice_tc_set_ipv4 - Parse IPv4 addresses from TC flower filter
  * @match: Pointer to flow match structure
@@ -988,7 +1040,8 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 	      BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) |
 	      BIT(FLOW_DISSECTOR_KEY_ENC_IP) |
-	      BIT(FLOW_DISSECTOR_KEY_PORTS))) {
+	      BIT(FLOW_DISSECTOR_KEY_PORTS) |
+	      BIT(FLOW_DISSECTOR_KEY_PPPOE))) {
 		NL_SET_ERR_MSG_MOD(fltr->extack, "Unsupported key used");
 		return -EOPNOTSUPP;
 	}
@@ -1124,6 +1177,22 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi,
 			headers->cvlan_hdr.vlan_prio = match.key->vlan_priority;
 	}
 
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PPPOE)) {
+		struct flow_match_pppoe match;
+
+		flow_rule_match_pppoe(rule, &match);
+		n_proto_key = ice_tc_set_pppoe(&match, fltr, headers);
+
+		/* If ethertype equals ETH_P_PPP_SES, n_proto might be
+		 * overwritten by encapsulated protocol (ppp_proto field) or set
+		 * to 0. To correct this, flow_match_pppoe provides the type
+		 * field, which contains the actual ethertype (ETH_P_PPP_SES).
+		 */
+		headers->l2_key.n_proto = cpu_to_be16(n_proto_key);
+		headers->l2_mask.n_proto = cpu_to_be16(0xFFFF);
+		fltr->flags |= ICE_TC_FLWR_FIELD_ETH_TYPE_ID;
+	}
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 		struct flow_match_control match;