octeontx2-pf: TC flower offload support for mirror

This patch extends TC flower offload support for mirroring ingress
traffic to a different PF/VF. Below is an example command,

'tc filter add dev eth1 ingress protocol ip flower src_ip <ip-addr>
skip_sw action mirred ingress mirror dev eth2'
Signed-off-by: Suman Ghosh <sumang@marvell.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -29,6 +29,8 @@
 
 #define OTX2_UNSUPP_LSE_DEPTH		GENMASK(6, 4)
 
+#define MCAST_INVALID_GRP		(-1U)
+
 struct otx2_tc_flow_stats {
 	u64 bytes;
 	u64 pkts;
@@ -47,6 +49,7 @@ struct otx2_tc_flow {
 	bool				is_act_police;
 	u32				prio;
 	struct npc_install_flow_req	req;
+	u32				mcast_grp_idx;
 	u64				rate;
 	u32				burst;
 	bool				is_pps;
@@ -355,22 +358,96 @@ static int otx2_tc_act_set_police(struct otx2_nic *nic,
 	return rc;
 }
 
+static int otx2_tc_update_mcast(struct otx2_nic *nic,
+				struct npc_install_flow_req *req,
+				struct netlink_ext_ack *extack,
+				struct otx2_tc_flow *node,
+				struct nix_mcast_grp_update_req *ureq,
+				u8 num_intf)
+{
+	struct nix_mcast_grp_update_req *grp_update_req;
+	struct nix_mcast_grp_create_req *creq;
+	struct nix_mcast_grp_create_rsp *crsp;
+	u32 grp_index;
+	int rc;
+
+	mutex_lock(&nic->mbox.lock);
+	creq = otx2_mbox_alloc_msg_nix_mcast_grp_create(&nic->mbox);
+	if (!creq) {
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	creq->dir = NIX_MCAST_INGRESS;
+	/* Send message to AF */
+	rc = otx2_sync_mbox_msg(&nic->mbox);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to create multicast group");
+		goto error;
+	}
+
+	crsp = (struct nix_mcast_grp_create_rsp *)otx2_mbox_get_rsp(&nic->mbox.mbox,
+			0,
+			&creq->hdr);
+	if (IS_ERR(crsp)) {
+		rc = PTR_ERR(crsp);
+		goto error;
+	}
+
+	grp_index = crsp->mcast_grp_idx;
+	grp_update_req = otx2_mbox_alloc_msg_nix_mcast_grp_update(&nic->mbox);
+	if (!grp_update_req) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to update multicast group");
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	ureq->op = NIX_MCAST_OP_ADD_ENTRY;
+	ureq->mcast_grp_idx = grp_index;
+	ureq->num_mce_entry = num_intf;
+	ureq->pcifunc[0] = nic->pcifunc;
+	ureq->channel[0] = nic->hw.tx_chan_base;
+
+	ureq->dest_type[0] = NIX_RX_RSS;
+	ureq->rq_rss_index[0] = 0;
+	memcpy(&ureq->hdr, &grp_update_req->hdr, sizeof(struct mbox_msghdr));
+	memcpy(grp_update_req, ureq, sizeof(struct nix_mcast_grp_update_req));
+
+	/* Send message to AF */
+	rc = otx2_sync_mbox_msg(&nic->mbox);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to update multicast group");
+		goto error;
+	}
+
+	mutex_unlock(&nic->mbox.lock);
+	req->op = NIX_RX_ACTIONOP_MCAST;
+	req->index = grp_index;
+	node->mcast_grp_idx = grp_index;
+	return 0;
+
+error:
+	mutex_unlock(&nic->mbox.lock);
+	return rc;
+}
+
 static int otx2_tc_parse_actions(struct otx2_nic *nic,
 				 struct flow_action *flow_action,
 				 struct npc_install_flow_req *req,
 				 struct flow_cls_offload *f,
 				 struct otx2_tc_flow *node)
 {
+	struct nix_mcast_grp_update_req dummy_grp_update_req = { 0 };
 	struct netlink_ext_ack *extack = f->common.extack;
+	bool pps = false, mcast = false;
 	struct flow_action_entry *act;
 	struct net_device *target;
 	struct otx2_nic *priv;
 	u32 burst, mark = 0;
 	u8 nr_police = 0;
-	bool pps = false;
+	u8 num_intf = 1;
+	int err, i;
 	u64 rate;
-	int err;
-	int i;
 
 	if (!flow_action_has_entries(flow_action)) {
 		NL_SET_ERR_MSG_MOD(extack, "no tc actions specified");
@@ -442,11 +519,30 @@ static int otx2_tc_parse_actions(struct otx2_nic *nic,
 			req->index = act->rx_queue;
 			break;
 
+		case FLOW_ACTION_MIRRED_INGRESS:
+			target = act->dev;
+			priv = netdev_priv(target);
+			dummy_grp_update_req.pcifunc[num_intf] = priv->pcifunc;
+			dummy_grp_update_req.channel[num_intf] = priv->hw.tx_chan_base;
+			dummy_grp_update_req.dest_type[num_intf] = NIX_RX_RSS;
+			dummy_grp_update_req.rq_rss_index[num_intf] = 0;
+			mcast = true;
+			num_intf++;
+			break;
+
 		default:
 			return -EOPNOTSUPP;
 		}
 	}
 
+	if (mcast) {
+		err = otx2_tc_update_mcast(nic, req, extack, node,
+					   &dummy_grp_update_req,
+					   num_intf);
+		if (err)
+			return err;
+	}
+
 	if (nr_police > 1) {
 		NL_SET_ERR_MSG_MOD(extack,
 				   "rate limit police offload requires a single action");
@@ -1066,6 +1162,7 @@ static int otx2_tc_del_flow(struct otx2_nic *nic,
 			    struct flow_cls_offload *tc_flow_cmd)
 {
 	struct otx2_flow_config *flow_cfg = nic->flow_cfg;
+	struct nix_mcast_grp_destroy_req *grp_destroy_req;
 	struct otx2_tc_flow *flow_node;
 	int err;
 
@@ -1099,6 +1196,15 @@ static int otx2_tc_del_flow(struct otx2_nic *nic,
 
 		mutex_unlock(&nic->mbox.lock);
 	}
+	/* Remove the multicast/mirror related nodes */
+	if (flow_node->mcast_grp_idx != MCAST_INVALID_GRP) {
+		mutex_lock(&nic->mbox.lock);
+		grp_destroy_req = otx2_mbox_alloc_msg_nix_mcast_grp_destroy(&nic->mbox);
+		grp_destroy_req->mcast_grp_idx = flow_node->mcast_grp_idx;
+		otx2_sync_mbox_msg(&nic->mbox);
+		mutex_unlock(&nic->mbox.lock);
+	}
+
 
 free_mcam_flow:
 	otx2_del_mcam_flow_entry(nic, flow_node->entry, NULL);
@@ -1138,6 +1244,7 @@ static int otx2_tc_add_flow(struct otx2_nic *nic,
 	spin_lock_init(&new_node->lock);
 	new_node->cookie = tc_flow_cmd->cookie;
 	new_node->prio = tc_flow_cmd->common.prio;
+	new_node->mcast_grp_idx = MCAST_INVALID_GRP;
 
 	memset(&dummy, 0, sizeof(struct npc_install_flow_req));