octeontx2-pf: TC flower offload support for rxqueue mapping

TC rule support to offload rx queue mapping rules.

Eg:
tc filter add dev eth2 ingress protocol ip flower \
dst_ip 192.168.8.100 \
action skbedit queue_mapping 4 skip_sw
action mirred ingress redirect dev eth5

Packets destined to 192.168.8.100 will be forwarded to rx
queue 4 of eth5 interface.

tc filter add dev eth2 ingress protocol ip flower \
dst_ip 192.168.8.100 \
action skbedit queue_mapping 9 skip_sw

Packets destined to 192.168.8.100 will be forwarded to rx
queue 4 of eth2 interface.

Signed-off-by: Ratheesh Kannoth <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

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

···
 				return -EOPNOTSUPP;
 			}
 			req->vf = priv->pcifunc & RVU_PFVF_FUNC_MASK;
-			req->op = NIX_RX_ACTION_DEFAULT;
-			return 0;
+
+			/* if op is already set; avoid overwriting the same */
+			if (!req->op)
+				req->op = NIX_RX_ACTION_DEFAULT;
+			break;
+
 		case FLOW_ACTION_VLAN_POP:
 			req->vtag0_valid = true;
 			/* use RX_VTAG_TYPE7 which is initialized to strip vlan tag */
···
 		case FLOW_ACTION_MARK:
 			mark = act->mark;
 			break;
+
+		case FLOW_ACTION_RX_QUEUE_MAPPING:
+			req->op = NIX_RX_ACTIONOP_UCAST;
+			req->index = act->rx_queue;
+			break;
+
 		default:
 			return -EOPNOTSUPP;
 		}