net: mscc: ocelot: offload egress VLAN rewriting to VCAP ES0

VCAP ES0 is an egress VCAP operating on all outgoing frames.
This patch added ES0 driver to support vlan push action of tc filter.
Usage:

tc filter add dev swp1 egress protocol 802.1Q flower indev swp0 skip_sw \
        vlan_id 1 vlan_prio 1 action vlan push id 2 priority 2
Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mscc/ocelot.c

@@ -111,6 +111,10 @@ static void ocelot_vcap_enable(struct ocelot *ocelot, int port)
 
 	ocelot_write_gix(ocelot, ANA_PORT_VCAP_CFG_S1_ENA,
 			 ANA_PORT_VCAP_CFG, port);
+
+	ocelot_rmw_gix(ocelot, REW_PORT_CFG_ES0_EN,
+		       REW_PORT_CFG_ES0_EN,
+		       REW_PORT_CFG, port);
 }
 
 static inline u32 ocelot_vlant_read_vlanaccess(struct ocelot *ocelot)

drivers/net/ethernet/mscc/ocelot_flower.c

@@ -148,6 +148,7 @@ static int ocelot_flower_parse_action(struct flow_cls_offload *f, bool ingress,
 	struct netlink_ext_ack *extack = f->common.extack;
 	bool allow_missing_goto_target = false;
 	const struct flow_action_entry *a;
+	enum ocelot_tag_tpid_sel tpid;
 	int i, chain;
 	u64 rate;
 
@@ -267,6 +268,31 @@ static int ocelot_flower_parse_action(struct flow_cls_offload *f, bool ingress,
 				filter->type = OCELOT_VCAP_FILTER_PAG;
 			}
 			break;
+		case FLOW_ACTION_VLAN_PUSH:
+			if (filter->block_id != VCAP_ES0) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "VLAN push action can only be offloaded to VCAP ES0");
+				return -EOPNOTSUPP;
+			}
+			switch (ntohs(a->vlan.proto)) {
+			case ETH_P_8021Q:
+				tpid = OCELOT_TAG_TPID_SEL_8021Q;
+				break;
+			case ETH_P_8021AD:
+				tpid = OCELOT_TAG_TPID_SEL_8021AD;
+				break;
+			default:
+				NL_SET_ERR_MSG_MOD(extack,
+						   "Cannot push custom TPID");
+				return -EOPNOTSUPP;
+			}
+			filter->action.tag_a_tpid_sel = tpid;
+			filter->action.push_outer_tag = OCELOT_ES0_TAG;
+			filter->action.tag_a_vid_sel = 1;
+			filter->action.vid_a_val = a->vlan.vid;
+			filter->action.pcp_a_val = a->vlan.prio;
+			filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
+			break;
 		default:
 			NL_SET_ERR_MSG_MOD(extack, "Cannot offload action");
 			return -EOPNOTSUPP;
@@ -292,7 +318,60 @@ static int ocelot_flower_parse_action(struct flow_cls_offload *f, bool ingress,
 	return 0;
 }
 
-static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
+static int ocelot_flower_parse_indev(struct ocelot *ocelot, int port,
+				     struct flow_cls_offload *f,
+				     struct ocelot_vcap_filter *filter)
+{
+	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
+	const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
+	int key_length = vcap->keys[VCAP_ES0_IGR_PORT].length;
+	struct netlink_ext_ack *extack = f->common.extack;
+	struct net_device *dev, *indev;
+	struct flow_match_meta match;
+	int ingress_port;
+
+	flow_rule_match_meta(rule, &match);
+
+	if (!match.mask->ingress_ifindex)
+		return 0;
+
+	if (match.mask->ingress_ifindex != 0xFFFFFFFF) {
+		NL_SET_ERR_MSG_MOD(extack, "Unsupported ingress ifindex mask");
+		return -EOPNOTSUPP;
+	}
+
+	dev = ocelot->ops->port_to_netdev(ocelot, port);
+	if (!dev)
+		return -EINVAL;
+
+	indev = __dev_get_by_index(dev_net(dev), match.key->ingress_ifindex);
+	if (!indev) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Can't find the ingress port to match on");
+		return -ENOENT;
+	}
+
+	ingress_port = ocelot->ops->netdev_to_port(indev);
+	if (ingress_port < 0) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Can only offload an ocelot ingress port");
+		return -EOPNOTSUPP;
+	}
+	if (ingress_port == port) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Ingress port is equal to the egress port");
+		return -EINVAL;
+	}
+
+	filter->ingress_port.value = ingress_port;
+	filter->ingress_port.mask = GENMASK(key_length - 1, 0);
+
+	return 0;
+}
+
+static int
+ocelot_flower_parse_key(struct ocelot *ocelot, int port, bool ingress,
+			struct flow_cls_offload *f,
 			struct ocelot_vcap_filter *filter)
 {
 	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
@@ -300,10 +379,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 	struct netlink_ext_ack *extack = f->common.extack;
 	u16 proto = ntohs(f->common.protocol);
 	bool match_protocol = true;
+	int ret;
 
 	if (dissector->used_keys &
 	    ~(BIT(FLOW_DISSECTOR_KEY_CONTROL) |
 	      BIT(FLOW_DISSECTOR_KEY_BASIC) |
+	      BIT(FLOW_DISSECTOR_KEY_META) |
 	      BIT(FLOW_DISSECTOR_KEY_PORTS) |
 	      BIT(FLOW_DISSECTOR_KEY_VLAN) |
 	      BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
@@ -312,6 +393,13 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 		return -EOPNOTSUPP;
 	}
 
+	/* For VCAP ES0 (egress rewriter) we can match on the ingress port */
+	if (!ingress) {
+		ret = ocelot_flower_parse_indev(ocelot, port, f, filter);
+		if (ret)
+			return ret;
+	}
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 		struct flow_match_control match;
 
@@ -321,6 +409,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
 		struct flow_match_eth_addrs match;
 
+		if (filter->block_id == VCAP_ES0) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "VCAP ES0 cannot match on MAC address");
+			return -EOPNOTSUPP;
+		}
+
 		if (filter->block_id == VCAP_IS1 &&
 		    !is_zero_ether_addr(match.mask->dst)) {
 			NL_SET_ERR_MSG_MOD(extack,
@@ -359,6 +453,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 
 		flow_rule_match_basic(rule, &match);
 		if (ntohs(match.key->n_proto) == ETH_P_IP) {
+			if (filter->block_id == VCAP_ES0) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "VCAP ES0 cannot match on IP protocol");
+				return -EOPNOTSUPP;
+			}
+
 			filter->key_type = OCELOT_VCAP_KEY_IPV4;
 			filter->key.ipv4.proto.value[0] =
 				match.key->ip_proto;
@@ -367,6 +467,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 			match_protocol = false;
 		}
 		if (ntohs(match.key->n_proto) == ETH_P_IPV6) {
+			if (filter->block_id == VCAP_ES0) {
+				NL_SET_ERR_MSG_MOD(extack,
+						   "VCAP ES0 cannot match on IP protocol");
+				return -EOPNOTSUPP;
+			}
+
 			filter->key_type = OCELOT_VCAP_KEY_IPV6;
 			filter->key.ipv6.proto.value[0] =
 				match.key->ip_proto;
@@ -381,6 +487,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 		struct flow_match_ipv4_addrs match;
 		u8 *tmp;
 
+		if (filter->block_id == VCAP_ES0) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "VCAP ES0 cannot match on IP address");
+			return -EOPNOTSUPP;
+		}
+
 		if (filter->block_id == VCAP_IS1 && *(u32 *)&match.mask->dst) {
 			NL_SET_ERR_MSG_MOD(extack,
 					   "Key type S1_NORMAL cannot match on destination IP");
@@ -410,6 +522,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
 		struct flow_match_ports match;
 
+		if (filter->block_id == VCAP_ES0) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "VCAP ES0 cannot match on L4 ports");
+			return -EOPNOTSUPP;
+		}
+
 		flow_rule_match_ports(rule, &match);
 		filter->key.ipv4.sport.value = ntohs(match.key->src);
 		filter->key.ipv4.sport.mask = ntohs(match.mask->src);
@@ -432,6 +550,12 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 
 finished_key_parsing:
 	if (match_protocol && proto != ETH_P_ALL) {
+		if (filter->block_id == VCAP_ES0) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "VCAP ES0 cannot match on L2 proto");
+			return -EOPNOTSUPP;
+		}
+
 		/* TODO: support SNAP, LLC etc */
 		if (proto < ETH_P_802_3_MIN)
 			return -EOPNOTSUPP;
@@ -444,7 +568,8 @@ static int ocelot_flower_parse_key(struct flow_cls_offload *f, bool ingress,
 	return 0;
 }
 
-static int ocelot_flower_parse(struct flow_cls_offload *f, bool ingress,
+static int ocelot_flower_parse(struct ocelot *ocelot, int port, bool ingress,
+			       struct flow_cls_offload *f,
 			       struct ocelot_vcap_filter *filter)
 {
 	int ret;
@@ -456,11 +581,11 @@ static int ocelot_flower_parse(struct flow_cls_offload *f, bool ingress,
 	if (ret)
 		return ret;
 
-	return ocelot_flower_parse_key(f, ingress, filter);
+	return ocelot_flower_parse_key(ocelot, port, ingress, f, filter);
 }
 
 static struct ocelot_vcap_filter
-*ocelot_vcap_filter_create(struct ocelot *ocelot, int port,
+*ocelot_vcap_filter_create(struct ocelot *ocelot, int port, bool ingress,
 			   struct flow_cls_offload *f)
 {
 	struct ocelot_vcap_filter *filter;
@@ -469,7 +594,16 @@ static struct ocelot_vcap_filter
 	if (!filter)
 		return NULL;
 
+	if (ingress) {
 		filter->ingress_port_mask = BIT(port);
+	} else {
+		const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
+		int key_length = vcap->keys[VCAP_ES0_EGR_PORT].length;
+
+		filter->egress_port.value = port;
+		filter->egress_port.mask = GENMASK(key_length - 1, 0);
+	}
+
 	return filter;
 }
 
@@ -503,11 +637,11 @@ int ocelot_cls_flower_replace(struct ocelot *ocelot, int port,
 		return -EOPNOTSUPP;
 	}
 
-	filter = ocelot_vcap_filter_create(ocelot, port, f);
+	filter = ocelot_vcap_filter_create(ocelot, port, ingress, f);
 	if (!filter)
 		return -ENOMEM;
 
-	ret = ocelot_flower_parse(f, ingress, filter);
+	ret = ocelot_flower_parse(ocelot, port, ingress, f, filter);
 	if (ret) {
 		kfree(filter);
 		return ret;

drivers/net/ethernet/mscc/ocelot_vcap.c

@@ -774,6 +774,79 @@ static void is1_entry_set(struct ocelot *ocelot, int ix,
 	vcap_row_cmd(ocelot, vcap, row, VCAP_CMD_WRITE, VCAP_SEL_ALL);
 }
 
+static void es0_action_set(struct ocelot *ocelot, struct vcap_data *data,
+			   const struct ocelot_vcap_filter *filter)
+{
+	const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
+	const struct ocelot_vcap_action *a = &filter->action;
+
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_PUSH_OUTER_TAG,
+			a->push_outer_tag);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_PUSH_INNER_TAG,
+			a->push_inner_tag);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_TAG_A_TPID_SEL,
+			a->tag_a_tpid_sel);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_TAG_A_VID_SEL,
+			a->tag_a_vid_sel);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_TAG_A_PCP_SEL,
+			a->tag_a_pcp_sel);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_VID_A_VAL, a->vid_a_val);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_PCP_A_VAL, a->pcp_a_val);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_TAG_B_TPID_SEL,
+			a->tag_b_tpid_sel);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_TAG_B_VID_SEL,
+			a->tag_b_vid_sel);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_TAG_B_PCP_SEL,
+			a->tag_b_pcp_sel);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_VID_B_VAL, a->vid_b_val);
+	vcap_action_set(vcap, data, VCAP_ES0_ACT_PCP_B_VAL, a->pcp_b_val);
+}
+
+static void es0_entry_set(struct ocelot *ocelot, int ix,
+			  struct ocelot_vcap_filter *filter)
+{
+	const struct vcap_props *vcap = &ocelot->vcap[VCAP_ES0];
+	struct ocelot_vcap_key_vlan *tag = &filter->vlan;
+	struct ocelot_vcap_u64 payload;
+	struct vcap_data data;
+	int row = ix;
+
+	memset(&payload, 0, sizeof(payload));
+	memset(&data, 0, sizeof(data));
+
+	/* Read row */
+	vcap_row_cmd(ocelot, vcap, row, VCAP_CMD_READ, VCAP_SEL_ALL);
+	vcap_cache2entry(ocelot, vcap, &data);
+	vcap_cache2action(ocelot, vcap, &data);
+
+	data.tg_sw = VCAP_TG_FULL;
+	data.type = ES0_ACTION_TYPE_NORMAL;
+	vcap_data_offset_get(vcap, &data, ix);
+	data.tg = (data.tg & ~data.tg_mask);
+	if (filter->prio != 0)
+		data.tg |= data.tg_value;
+
+	vcap_key_set(vcap, &data, VCAP_ES0_IGR_PORT, filter->ingress_port.value,
+		     filter->ingress_port.mask);
+	vcap_key_set(vcap, &data, VCAP_ES0_EGR_PORT, filter->egress_port.value,
+		     filter->egress_port.mask);
+	vcap_key_bit_set(vcap, &data, VCAP_ES0_L2_MC, filter->dmac_mc);
+	vcap_key_bit_set(vcap, &data, VCAP_ES0_L2_BC, filter->dmac_bc);
+	vcap_key_set(vcap, &data, VCAP_ES0_VID,
+		     tag->vid.value, tag->vid.mask);
+	vcap_key_set(vcap, &data, VCAP_ES0_PCP,
+		     tag->pcp.value[0], tag->pcp.mask[0]);
+
+	es0_action_set(ocelot, &data, filter);
+	vcap_data_set(data.counter, data.counter_offset,
+		      vcap->counter_width, filter->stats.pkts);
+
+	/* Write row */
+	vcap_entry2cache(ocelot, vcap, &data);
+	vcap_action2cache(ocelot, vcap, &data);
+	vcap_row_cmd(ocelot, vcap, row, VCAP_CMD_WRITE, VCAP_SEL_ALL);
+}
+
 static void vcap_entry_get(struct ocelot *ocelot, int ix,
 			   struct ocelot_vcap_filter *filter)
 {
@@ -782,7 +855,11 @@ static void vcap_entry_get(struct ocelot *ocelot, int ix,
 	int row, count;
 	u32 cnt;
 
+	if (filter->block_id == VCAP_ES0)
+		data.tg_sw = VCAP_TG_FULL;
+	else
 		data.tg_sw = VCAP_TG_HALF;
+
 	count = (1 << (data.tg_sw - 1));
 	row = (ix / count);
 	vcap_row_cmd(ocelot, vcap, row, VCAP_CMD_READ, VCAP_SEL_COUNTER);
@@ -801,6 +878,8 @@ static void vcap_entry_set(struct ocelot *ocelot, int ix,
 		return is1_entry_set(ocelot, ix, filter);
 	if (filter->block_id == VCAP_IS2)
 		return is2_entry_set(ocelot, ix, filter);
+	if (filter->block_id == VCAP_ES0)
+		return es0_entry_set(ocelot, ix, filter);
 }
 
 static int ocelot_vcap_policer_add(struct ocelot *ocelot, u32 pol_ix,

drivers/net/ethernet/mscc/ocelot_vcap.h

@@ -78,6 +78,11 @@ struct ocelot_vcap_udp_tcp {
 	u16 mask;
 };
 
+struct ocelot_vcap_port {
+	u8 value;
+	u8 mask;
+};
+
 enum ocelot_vcap_key_type {
 	OCELOT_VCAP_KEY_ANY,
 	OCELOT_VCAP_KEY_ETYPE,
@@ -184,8 +189,38 @@ enum ocelot_mask_mode {
 	OCELOT_MASK_MODE_REDIRECT,
 };
 
+enum ocelot_es0_tag {
+	OCELOT_NO_ES0_TAG,
+	OCELOT_ES0_TAG,
+	OCELOT_FORCE_PORT_TAG,
+	OCELOT_FORCE_UNTAG,
+};
+
+enum ocelot_tag_tpid_sel {
+	OCELOT_TAG_TPID_SEL_8021Q,
+	OCELOT_TAG_TPID_SEL_8021AD,
+};
+
 struct ocelot_vcap_action {
 	union {
+		/* VCAP ES0 */
+		struct {
+			enum ocelot_es0_tag push_outer_tag;
+			enum ocelot_es0_tag push_inner_tag;
+			enum ocelot_tag_tpid_sel tag_a_tpid_sel;
+			int tag_a_vid_sel;
+			int tag_a_pcp_sel;
+			u16 vid_a_val;
+			u8 pcp_a_val;
+			u8 dei_a_val;
+			enum ocelot_tag_tpid_sel tag_b_tpid_sel;
+			int tag_b_vid_sel;
+			int tag_b_pcp_sel;
+			u16 vid_b_val;
+			u8 pcp_b_val;
+			u8 dei_b_val;
+		};
+
 		/* VCAP IS1 */
 		struct {
 			bool vid_replace_ena;
@@ -239,7 +274,11 @@ struct ocelot_vcap_filter {
 
 	struct ocelot_vcap_action action;
 	struct ocelot_vcap_stats stats;
+	/* For VCAP IS1 and IS2 */
 	unsigned long ingress_port_mask;
+	/* For VCAP ES0 */
+	struct ocelot_vcap_port ingress_port;
+	struct ocelot_vcap_port egress_port;
 
 	enum ocelot_vcap_bit dmac_mc;
 	enum ocelot_vcap_bit dmac_bc;