octeontx2-pf: Add support for offload tc with skbedit mark action

Support offloading of skbedit mark action.

For example, to mark with 0x0008, with dest ip 60.60.60.2 on eth2
interface:

 # tc qdisc add dev eth2 ingress
 # tc filter add dev eth2 ingress protocol ip flower \
      dst_ip 60.60.60.2 action skbedit mark 0x0008 skip_sw
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -1187,6 +1187,8 @@ static int npc_update_rx_entry(struct rvu *rvu, struct rvu_pfvf *pfvf,
 			action.pf_func = target;
 			action.op = NIX_RX_ACTIONOP_UCAST;
 		}
+		if (req->match_id)
+			action.match_id = req->match_id;
 	}
 
 	entry->action = *(u64 *)&action;

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h

@@ -363,6 +363,7 @@ struct otx2_flow_config {
 	struct list_head	flow_list;
 	u32			dmacflt_max_flows;
 	u16                     max_flows;
+	refcount_t		mark_flows;
 	struct list_head	flow_list_tc;
 	bool			ntuple;
 };
@@ -465,6 +466,7 @@ struct otx2_nic {
 #define OTX2_FLAG_DMACFLTR_SUPPORT		BIT_ULL(14)
 #define OTX2_FLAG_PTP_ONESTEP_SYNC		BIT_ULL(15)
 #define OTX2_FLAG_ADPTV_INT_COAL_ENABLED BIT_ULL(16)
+#define OTX2_FLAG_TC_MARK_ENABLED		BIT_ULL(17)
 	u64			flags;
 	u64			*cq_op_addr;
 

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

@@ -252,6 +252,7 @@ static int otx2_mcam_entry_init(struct otx2_nic *pfvf)
 
 	pfvf->flags |= OTX2_FLAG_TC_FLOWER_SUPPORT;
 
+	refcount_set(&flow_cfg->mark_flows, 1);
 	return 0;
 }
 

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

@@ -511,7 +511,15 @@ static int otx2_tc_parse_actions(struct otx2_nic *nic,
 			nr_police++;
 			break;
 		case FLOW_ACTION_MARK:
+			if (act->mark & ~OTX2_RX_MATCH_ID_MASK) {
+				NL_SET_ERR_MSG_MOD(extack, "Bad flow mark, only 16 bit supported");
+				return -EOPNOTSUPP;
+			}
 			mark = act->mark;
+			req->match_id = mark & OTX2_RX_MATCH_ID_MASK;
+			req->op = NIX_RX_ACTION_DEFAULT;
+			nic->flags |= OTX2_FLAG_TC_MARK_ENABLED;
+			refcount_inc(&nic->flow_cfg->mark_flows);
 			break;
 
 		case FLOW_ACTION_RX_QUEUE_MAPPING:
@@ -1187,6 +1195,11 @@ static int otx2_tc_del_flow(struct otx2_nic *nic,
 		return -EINVAL;
 	}
 
+	/* Disable TC MARK flag if they are no rules with skbedit mark action */
+	if (flow_node->req.match_id)
+		if (!refcount_dec_and_test(&flow_cfg->mark_flows))
+			nic->flags &= ~OTX2_FLAG_TC_MARK_ENABLED;
+
 	if (flow_node->is_act_police) {
 		__clear_bit(flow_node->rq, &nic->rq_bmap);
 

drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c

@@ -380,6 +380,9 @@ static void otx2_rcv_pkt_handler(struct otx2_nic *pfvf,
 	if (pfvf->netdev->features & NETIF_F_RXCSUM)
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
+	if (pfvf->flags & OTX2_FLAG_TC_MARK_ENABLED)
+		skb->mark = parse->match_id;
+
 	skb_mark_for_recycle(skb);
 
 	napi_gro_frags(napi);

drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.h

@@ -62,6 +62,9 @@
 #define CQ_OP_STAT_OP_ERR       63
 #define CQ_OP_STAT_CQ_ERR       46
 
+/* Packet mark mask */
+#define OTX2_RX_MATCH_ID_MASK 0x0000ffff
+
 struct queue_stats {
 	u64	bytes;
 	u64	pkts;