octeontx2-pf: TC flower offload support for SPI field

Driver support to offload TC flower rules which matches
against SPI field of IPSEC packets (AH/ESP).

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: rkannoth1

drivers/net/ethernet/marvell/octeontx2/af/mbox.h

@@ -1451,6 +1451,10 @@ struct flow_msg {
 		__be32 ip4dst;
 		__be32 ip6dst[4];
 	};
+	union {
+		__be32 spi;
+	};
+
 	u8 tos;
 	u8 ip_ver;
 	u8 ip_proto;

drivers/net/ethernet/marvell/octeontx2/af/npc.h

@@ -204,6 +204,7 @@ enum key_fields {
 	NPC_DPORT_UDP,
 	NPC_SPORT_SCTP,
 	NPC_DPORT_SCTP,
+	NPC_IPSEC_SPI,
 	NPC_HEADER_FIELDS_MAX,
 	NPC_CHAN = NPC_HEADER_FIELDS_MAX, /* Valid when Rx */
 	NPC_PF_FUNC, /* Valid when Tx */

drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c

@@ -2827,6 +2827,10 @@ static void rvu_dbg_npc_mcam_show_flows(struct seq_file *s,
 			seq_printf(s, "%d ", ntohs(rule->packet.dport));
 			seq_printf(s, "mask 0x%x\n", ntohs(rule->mask.dport));
 			break;
+		case NPC_IPSEC_SPI:
+			seq_printf(s, "0x%x ", ntohl(rule->packet.spi));
+			seq_printf(s, "mask 0x%x\n", ntohl(rule->mask.spi));
+			break;
 		default:
 			seq_puts(s, "\n");
 			break;

drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c

@@ -41,6 +41,7 @@ static const char * const npc_flow_names[] = {
 	[NPC_SPORT_SCTP] = "sctp source port",
 	[NPC_DPORT_SCTP] = "sctp destination port",
 	[NPC_LXMB]	= "Mcast/Bcast header ",
+	[NPC_IPSEC_SPI] = "SPI ",
 	[NPC_UNKNOWN]	= "unknown",
 };
 
@@ -513,6 +514,10 @@ do {									       \
 	NPC_SCAN_HDR(NPC_VLAN_TAG1, NPC_LID_LB, NPC_LT_LB_CTAG, 2, 2);
 	NPC_SCAN_HDR(NPC_VLAN_TAG2, NPC_LID_LB, NPC_LT_LB_STAG_QINQ, 2, 2);
 	NPC_SCAN_HDR(NPC_DMAC, NPC_LID_LA, la_ltype, la_start, 6);
+
+	NPC_SCAN_HDR(NPC_IPSEC_SPI, NPC_LID_LD, NPC_LT_LD_AH, 4, 4);
+	NPC_SCAN_HDR(NPC_IPSEC_SPI, NPC_LID_LE, NPC_LT_LE_ESP, 0, 4);
+
 	/* SMAC follows the DMAC(which is 6 bytes) */
 	NPC_SCAN_HDR(NPC_SMAC, NPC_LID_LA, la_ltype, la_start + 6, 6);
 	/* PF_FUNC is 2 bytes at 0th byte of NPC_LT_LA_IH_NIX_ETHER */
@@ -564,6 +569,9 @@ static void npc_set_features(struct rvu *rvu, int blkaddr, u8 intf)
 		if (!npc_check_field(rvu, blkaddr, NPC_LB, intf))
 			*features &= ~BIT_ULL(NPC_OUTER_VID);
 
+	if (*features & (BIT_ULL(NPC_IPPROTO_AH) | BIT_ULL(NPC_IPPROTO_ESP)))
+		*features |= BIT_ULL(NPC_IPSEC_SPI);
+
 	/* for vlan ethertypes corresponding layer type should be in the key */
 	if (npc_check_field(rvu, blkaddr, NPC_LB, intf))
 		*features |= BIT_ULL(NPC_VLAN_ETYPE_CTAG) |
@@ -930,6 +938,9 @@ do {									      \
 	NPC_WRITE_FLOW(NPC_DPORT_SCTP, dport, ntohs(pkt->dport), 0,
 		       ntohs(mask->dport), 0);
 
+	NPC_WRITE_FLOW(NPC_IPSEC_SPI, spi, ntohl(pkt->spi), 0,
+		       ntohl(mask->spi), 0);
+
 	NPC_WRITE_FLOW(NPC_OUTER_VID, vlan_tci, ntohs(pkt->vlan_tci), 0,
 		       ntohs(mask->vlan_tci), 0);
 

drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c

@@ -461,6 +461,7 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 	      BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
 	      BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
 	      BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
+	      BIT(FLOW_DISSECTOR_KEY_IPSEC) |
 	      BIT_ULL(FLOW_DISSECTOR_KEY_IP))))  {
 		netdev_info(nic->netdev, "unsupported flow used key 0x%llx",
 			    dissector->used_keys);
@@ -482,6 +483,8 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 		     match.key->ip_proto != IPPROTO_UDP &&
 		     match.key->ip_proto != IPPROTO_SCTP &&
 		     match.key->ip_proto != IPPROTO_ICMP &&
+		     match.key->ip_proto != IPPROTO_ESP &&
+		     match.key->ip_proto != IPPROTO_AH &&
 		     match.key->ip_proto != IPPROTO_ICMPV6)) {
 			netdev_info(nic->netdev,
 				    "ip_proto=0x%x not supported\n",
@@ -501,6 +504,10 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 			req->features |= BIT_ULL(NPC_IPPROTO_ICMP);
 		else if (ip_proto == IPPROTO_ICMPV6)
 			req->features |= BIT_ULL(NPC_IPPROTO_ICMP6);
+		else if (ip_proto == IPPROTO_ESP)
+			req->features |= BIT_ULL(NPC_IPPROTO_ESP);
+		else if (ip_proto == IPPROTO_AH)
+			req->features |= BIT_ULL(NPC_IPPROTO_AH);
 	}
 
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
@@ -545,6 +552,26 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 		}
 	}
 
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPSEC)) {
+		struct flow_match_ipsec match;
+
+		flow_rule_match_ipsec(rule, &match);
+		if (!match.mask->spi) {
+			NL_SET_ERR_MSG_MOD(extack, "spi index not specified");
+			return -EOPNOTSUPP;
+		}
+		if (ip_proto != IPPROTO_ESP &&
+		    ip_proto != IPPROTO_AH) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "SPI index is valid only for ESP/AH proto");
+			return -EOPNOTSUPP;
+		}
+
+		flow_spec->spi = match.key->spi;
+		flow_mask->spi = match.mask->spi;
+		req->features |= BIT_ULL(NPC_IPSEC_SPI);
+	}
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IP)) {
 		struct flow_match_ip match;