octeontx2-pf: Add ip tos and ip proto icmp/icmpv6 flow offload support

Add support for programming the HW MCAM match key with IP tos, IP(v6)
proto icmp/icmpv6, allowing flow offload rules to be installed using
those fields. The NPC HW extracts layer type, which will be used as a
matching criteria for different IP protocols.

The ethtool n-tuple filter logic has been updated to parse the IP tos
and l4proto for HW offloading. l4proto tcp/udp/sctp/ah/esp/icmp are
supported. See example usage below.

Ex: Redirect l4proto icmp to vf 0 queue 0
ethtool -U eth0 flow-type ip4 l4proto 1 action vf 0 queue 0

Ex: Redirect flow with ip tos 8 to vf 0 queue 0
ethtool -U eth0 flow-type ip4 tos 8 vf 0 queue 0
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -167,6 +167,8 @@ enum key_fields {
 	NPC_IPPROTO_SCTP,
 	NPC_IPPROTO_AH,
 	NPC_IPPROTO_ESP,
+	NPC_IPPROTO_ICMP,
+	NPC_IPPROTO_ICMP6,
 	NPC_SPORT_TCP,
 	NPC_DPORT_TCP,
 	NPC_SPORT_UDP,

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

@@ -29,6 +29,8 @@ static const char * const npc_flow_names[] = {
 	[NPC_IPPROTO_TCP] = "ip proto tcp",
 	[NPC_IPPROTO_UDP] = "ip proto udp",
 	[NPC_IPPROTO_SCTP] = "ip proto sctp",
+	[NPC_IPPROTO_ICMP] = "ip proto icmp",
+	[NPC_IPPROTO_ICMP6] = "ip proto icmp6",
 	[NPC_IPPROTO_AH] = "ip proto AH",
 	[NPC_IPPROTO_ESP] = "ip proto ESP",
 	[NPC_SPORT_TCP]	= "tcp source port",
@@ -427,6 +429,7 @@ do {									       \
 	 * packet header fields below.
 	 * Example: Source IP is 4 bytes and starts at 12th byte of IP header
 	 */
+	NPC_SCAN_HDR(NPC_TOS, NPC_LID_LC, NPC_LT_LC_IP, 1, 1);
 	NPC_SCAN_HDR(NPC_SIP_IPV4, NPC_LID_LC, NPC_LT_LC_IP, 12, 4);
 	NPC_SCAN_HDR(NPC_DIP_IPV4, NPC_LID_LC, NPC_LT_LC_IP, 16, 4);
 	NPC_SCAN_HDR(NPC_SIP_IPV6, NPC_LID_LC, NPC_LT_LC_IP6, 8, 16);
@@ -477,9 +480,12 @@ static void npc_set_features(struct rvu *rvu, int blkaddr, u8 intf)
 				     BIT_ULL(NPC_IPPROTO_SCTP);
 	}
 
-	/* for AH, check if corresponding layer type is present in the key */
-	if (npc_check_field(rvu, blkaddr, NPC_LD, intf))
+	/* for AH/ICMP/ICMPv6/, check if corresponding layer type is present in the key */
+	if (npc_check_field(rvu, blkaddr, NPC_LD, intf)) {
 		*features |= BIT_ULL(NPC_IPPROTO_AH);
+		*features |= BIT_ULL(NPC_IPPROTO_ICMP);
+		*features |= BIT_ULL(NPC_IPPROTO_ICMP6);
+	}
 
 	/* for ESP, check if corresponding layer type is present in the key */
 	if (npc_check_field(rvu, blkaddr, NPC_LE, intf))
@@ -769,6 +775,12 @@ static void npc_update_flow(struct rvu *rvu, struct mcam_entry *entry,
 	if (features & BIT_ULL(NPC_IPPROTO_SCTP))
 		npc_update_entry(rvu, NPC_LD, entry, NPC_LT_LD_SCTP,
 				 0, ~0ULL, 0, intf);
+	if (features & BIT_ULL(NPC_IPPROTO_ICMP))
+		npc_update_entry(rvu, NPC_LD, entry, NPC_LT_LD_ICMP,
+				 0, ~0ULL, 0, intf);
+	if (features & BIT_ULL(NPC_IPPROTO_ICMP6))
+		npc_update_entry(rvu, NPC_LD, entry, NPC_LT_LD_ICMP6,
+				 0, ~0ULL, 0, intf);
 
 	if (features & BIT_ULL(NPC_OUTER_VID))
 		npc_update_entry(rvu, NPC_LB, entry,
@@ -798,6 +810,7 @@ do {									      \
 	NPC_WRITE_FLOW(NPC_SMAC, smac, smac_val, 0, smac_mask, 0);
 	NPC_WRITE_FLOW(NPC_ETYPE, etype, ntohs(pkt->etype), 0,
 		       ntohs(mask->etype), 0);
+	NPC_WRITE_FLOW(NPC_TOS, tos, pkt->tos, 0, mask->tos, 0);
 	NPC_WRITE_FLOW(NPC_SIP_IPV4, ip4src, ntohl(pkt->ip4src), 0,
 		       ntohl(mask->ip4src), 0);
 	NPC_WRITE_FLOW(NPC_DIP_IPV4, ip4dst, ntohl(pkt->ip4dst), 0,

drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c

@@ -301,6 +301,35 @@ static int otx2_prepare_ipv4_flow(struct ethtool_rx_flow_spec *fsp,
 			       sizeof(pmask->ip4dst));
 			req->features |= BIT_ULL(NPC_DIP_IPV4);
 		}
+		if (ipv4_usr_mask->tos) {
+			pkt->tos = ipv4_usr_hdr->tos;
+			pmask->tos = ipv4_usr_mask->tos;
+			req->features |= BIT_ULL(NPC_TOS);
+		}
+		if (ipv4_usr_mask->proto) {
+			switch (ipv4_usr_hdr->proto) {
+			case IPPROTO_ICMP:
+				req->features |= BIT_ULL(NPC_IPPROTO_ICMP);
+				break;
+			case IPPROTO_TCP:
+				req->features |= BIT_ULL(NPC_IPPROTO_TCP);
+				break;
+			case IPPROTO_UDP:
+				req->features |= BIT_ULL(NPC_IPPROTO_UDP);
+				break;
+			case IPPROTO_SCTP:
+				req->features |= BIT_ULL(NPC_IPPROTO_SCTP);
+				break;
+			case IPPROTO_AH:
+				req->features |= BIT_ULL(NPC_IPPROTO_AH);
+				break;
+			case IPPROTO_ESP:
+				req->features |= BIT_ULL(NPC_IPPROTO_ESP);
+				break;
+			default:
+				return -EOPNOTSUPP;
+			}
+		}
 		pkt->etype = cpu_to_be16(ETH_P_IP);
 		pmask->etype = cpu_to_be16(0xFFFF);
 		req->features |= BIT_ULL(NPC_ETYPE);
@@ -325,6 +354,11 @@ static int otx2_prepare_ipv4_flow(struct ethtool_rx_flow_spec *fsp,
 			       sizeof(pmask->ip4dst));
 			req->features |= BIT_ULL(NPC_DIP_IPV4);
 		}
+		if (ipv4_l4_mask->tos) {
+			pkt->tos = ipv4_l4_hdr->tos;
+			pmask->tos = ipv4_l4_mask->tos;
+			req->features |= BIT_ULL(NPC_TOS);
+		}
 		if (ipv4_l4_mask->psrc) {
 			memcpy(&pkt->sport, &ipv4_l4_hdr->psrc,
 			       sizeof(pkt->sport));
@@ -375,10 +409,14 @@ static int otx2_prepare_ipv4_flow(struct ethtool_rx_flow_spec *fsp,
 			       sizeof(pmask->ip4dst));
 			req->features |= BIT_ULL(NPC_DIP_IPV4);
 		}
+		if (ah_esp_mask->tos) {
+			pkt->tos = ah_esp_hdr->tos;
+			pmask->tos = ah_esp_mask->tos;
+			req->features |= BIT_ULL(NPC_TOS);
+		}
 
 		/* NPC profile doesn't extract AH/ESP header fields */
-		if ((ah_esp_mask->spi & ah_esp_hdr->spi) ||
-		    (ah_esp_mask->tos & ah_esp_mask->tos))
+		if (ah_esp_mask->spi & ah_esp_hdr->spi)
 			return -EOPNOTSUPP;
 
 		if (flow_type == AH_V4_FLOW)