mlxsw: spectrum_router: Support IPv6 multicast to host CPU

A step toward offloading IPv6 routing, this adds an additional
multicast routing table meant for IPv6 [with its underlying TCAM
region] and populates the default rule for IPv6 multicast packets.

Following this, ingress IPv6 multicast packets would be trapped and
delivered to the host CPU.
Signed-off-by: Yuval Mintz <yuvalm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_mr_tcam.c

@@ -51,7 +51,7 @@ struct mlxsw_sp_mr_tcam_region {
 };
 
 struct mlxsw_sp_mr_tcam {
-	struct mlxsw_sp_mr_tcam_region ipv4_tcam_region;
+	struct mlxsw_sp_mr_tcam_region tcam_regions[MLXSW_SP_L3_PROTO_MAX];
 };
 
 /* This struct maps to one RIGR2 register entry */
@@ -316,20 +316,37 @@ static int mlxsw_sp_mr_tcam_route_replace(struct mlxsw_sp *mlxsw_sp,
 					  mlxsw_afa_block_first_set(afa_block));
 		break;
 	case MLXSW_SP_L3_PROTO_IPV6:
-	default:
-		WARN_ON_ONCE(1);
+		mlxsw_reg_rmft2_ipv6_pack(rmft2_pl, true, parman_item->index,
+					  key->vrid,
+					  MLXSW_REG_RMFT2_IRIF_MASK_IGNORE, 0,
+					  key->group.addr6,
+					  key->group_mask.addr6,
+					  key->source.addr6,
+					  key->source_mask.addr6,
+					  mlxsw_afa_block_first_set(afa_block));
 	}
 
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rmft2), rmft2_pl);
 }
 
 static int mlxsw_sp_mr_tcam_route_remove(struct mlxsw_sp *mlxsw_sp, int vrid,
+					 struct mlxsw_sp_mr_route_key *key,
 					 struct parman_item *parman_item)
 {
+	struct in6_addr zero_addr = IN6ADDR_ANY_INIT;
 	char rmft2_pl[MLXSW_REG_RMFT2_LEN];
 
-	mlxsw_reg_rmft2_ipv4_pack(rmft2_pl, false, parman_item->index, vrid,
-				  0, 0, 0, 0, 0, 0, NULL);
+	switch (key->proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		mlxsw_reg_rmft2_ipv4_pack(rmft2_pl, false, parman_item->index,
+					  vrid, 0, 0, 0, 0, 0, 0, NULL);
+		break;
+	case MLXSW_SP_L3_PROTO_IPV6:
+		mlxsw_reg_rmft2_ipv6_pack(rmft2_pl, false, parman_item->index,
+					  vrid, 0, 0, zero_addr, zero_addr,
+					  zero_addr, zero_addr, NULL);
+		break;
+	}
 
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rmft2), rmft2_pl);
 }
@@ -353,27 +370,30 @@ mlxsw_sp_mr_tcam_erif_populate(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 }
 
+static struct mlxsw_sp_mr_tcam_region *
+mlxsw_sp_mr_tcam_protocol_region(struct mlxsw_sp_mr_tcam *mr_tcam,
+				 enum mlxsw_sp_l3proto proto)
+{
+	return &mr_tcam->tcam_regions[proto];
+}
+
 static int
 mlxsw_sp_mr_tcam_route_parman_item_add(struct mlxsw_sp_mr_tcam *mr_tcam,
 				       struct mlxsw_sp_mr_tcam_route *route,
 				       enum mlxsw_sp_mr_route_prio prio)
 {
-	struct parman_prio *parman_prio = NULL;
+	struct mlxsw_sp_mr_tcam_region *tcam_region;
 	int err;
 
-	switch (route->key.proto) {
-	case MLXSW_SP_L3_PROTO_IPV4:
-		parman_prio = &mr_tcam->ipv4_tcam_region.parman_prios[prio];
-		err = parman_item_add(mr_tcam->ipv4_tcam_region.parman,
-				      parman_prio, &route->parman_item);
-		if (err)
-			return err;
-		break;
-	case MLXSW_SP_L3_PROTO_IPV6:
-	default:
-		WARN_ON_ONCE(1);
-	}
-	route->parman_prio = parman_prio;
+	tcam_region = mlxsw_sp_mr_tcam_protocol_region(mr_tcam,
+						       route->key.proto);
+	err = parman_item_add(tcam_region->parman,
+			      &tcam_region->parman_prios[prio],
+			      &route->parman_item);
+	if (err)
+		return err;
+
+	route->parman_prio = &tcam_region->parman_prios[prio];
 	return 0;
 }
 
@@ -381,15 +401,13 @@ static void
 mlxsw_sp_mr_tcam_route_parman_item_remove(struct mlxsw_sp_mr_tcam *mr_tcam,
 					  struct mlxsw_sp_mr_tcam_route *route)
 {
-	switch (route->key.proto) {
-	case MLXSW_SP_L3_PROTO_IPV4:
-		parman_item_remove(mr_tcam->ipv4_tcam_region.parman,
-				   route->parman_prio, &route->parman_item);
-		break;
-	case MLXSW_SP_L3_PROTO_IPV6:
-	default:
-		WARN_ON_ONCE(1);
-	}
+	struct mlxsw_sp_mr_tcam_region *tcam_region;
+
+	tcam_region = mlxsw_sp_mr_tcam_protocol_region(mr_tcam,
+						       route->key.proto);
+
+	parman_item_remove(tcam_region->parman,
+			   route->parman_prio, &route->parman_item);
 }
 
 static int
@@ -462,7 +480,7 @@ static void mlxsw_sp_mr_tcam_route_destroy(struct mlxsw_sp *mlxsw_sp,
 	struct mlxsw_sp_mr_tcam *mr_tcam = priv;
 
 	mlxsw_sp_mr_tcam_route_remove(mlxsw_sp, route->key.vrid,
-				      &route->parman_item);
+				      &route->key, &route->parman_item);
 	mlxsw_sp_mr_tcam_route_parman_item_remove(mr_tcam, route);
 	mlxsw_sp_mr_tcam_afa_block_destroy(route->afa_block);
 	mlxsw_sp_flow_counter_free(mlxsw_sp, route->counter_index);
@@ -806,21 +824,42 @@ mlxsw_sp_mr_tcam_region_fini(struct mlxsw_sp_mr_tcam_region *mr_tcam_region)
 static int mlxsw_sp_mr_tcam_init(struct mlxsw_sp *mlxsw_sp, void *priv)
 {
 	struct mlxsw_sp_mr_tcam *mr_tcam = priv;
+	struct mlxsw_sp_mr_tcam_region *region = &mr_tcam->tcam_regions[0];
+	u32 rtar_key;
+	int err;
 
 	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, MC_ERIF_LIST_ENTRIES) ||
 	    !MLXSW_CORE_RES_VALID(mlxsw_sp->core, ACL_MAX_TCAM_RULES))
 		return -EIO;
 
-	return mlxsw_sp_mr_tcam_region_init(mlxsw_sp,
-					    &mr_tcam->ipv4_tcam_region,
-					    MLXSW_REG_RTAR_KEY_TYPE_IPV4_MULTICAST);
+	rtar_key = MLXSW_REG_RTAR_KEY_TYPE_IPV4_MULTICAST;
+	err = mlxsw_sp_mr_tcam_region_init(mlxsw_sp,
+					   &region[MLXSW_SP_L3_PROTO_IPV4],
+					   rtar_key);
+	if (err)
+		return err;
+
+	rtar_key = MLXSW_REG_RTAR_KEY_TYPE_IPV6_MULTICAST;
+	err = mlxsw_sp_mr_tcam_region_init(mlxsw_sp,
+					   &region[MLXSW_SP_L3_PROTO_IPV6],
+					   rtar_key);
+	if (err)
+		goto err_ipv6_region_init;
+
+	return 0;
+
+err_ipv6_region_init:
+	mlxsw_sp_mr_tcam_region_fini(&region[MLXSW_SP_L3_PROTO_IPV4]);
+	return err;
 }
 
 static void mlxsw_sp_mr_tcam_fini(void *priv)
 {
 	struct mlxsw_sp_mr_tcam *mr_tcam = priv;
+	struct mlxsw_sp_mr_tcam_region *region = &mr_tcam->tcam_regions[0];
 
-	mlxsw_sp_mr_tcam_region_fini(&mr_tcam->ipv4_tcam_region);
+	mlxsw_sp_mr_tcam_region_fini(&region[MLXSW_SP_L3_PROTO_IPV6]);
+	mlxsw_sp_mr_tcam_region_fini(&region[MLXSW_SP_L3_PROTO_IPV4]);
 }
 
 const struct mlxsw_sp_mr_ops mlxsw_sp_mr_tcam_ops = {

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -467,7 +467,7 @@ struct mlxsw_sp_vr {
 	unsigned int rif_count;
 	struct mlxsw_sp_fib *fib4;
 	struct mlxsw_sp_fib *fib6;
-	struct mlxsw_sp_mr_table *mr4_table;
+	struct mlxsw_sp_mr_table *mr_table[MLXSW_SP_L3_PROTO_MAX];
 };
 
 static const struct rhashtable_params mlxsw_sp_fib_ht_params;
@@ -711,7 +711,9 @@ static void mlxsw_sp_lpm_fini(struct mlxsw_sp *mlxsw_sp)
 
 static bool mlxsw_sp_vr_is_used(const struct mlxsw_sp_vr *vr)
 {
-	return !!vr->fib4 || !!vr->fib6 || !!vr->mr4_table;
+	return !!vr->fib4 || !!vr->fib6 ||
+	       !!vr->mr_table[MLXSW_SP_L3_PROTO_IPV4] ||
+	       !!vr->mr_table[MLXSW_SP_L3_PROTO_IPV6];
 }
 
 static struct mlxsw_sp_vr *mlxsw_sp_vr_find_unused(struct mlxsw_sp *mlxsw_sp)
@@ -789,7 +791,7 @@ static struct mlxsw_sp_vr *mlxsw_sp_vr_create(struct mlxsw_sp *mlxsw_sp,
 					      u32 tb_id,
 					      struct netlink_ext_ack *extack)
 {
-	struct mlxsw_sp_mr_table *mr4_table;
+	struct mlxsw_sp_mr_table *mr4_table, *mr6_table;
 	struct mlxsw_sp_fib *fib4;
 	struct mlxsw_sp_fib *fib6;
 	struct mlxsw_sp_vr *vr;
@@ -812,15 +814,25 @@ static struct mlxsw_sp_vr *mlxsw_sp_vr_create(struct mlxsw_sp *mlxsw_sp,
 					     MLXSW_SP_L3_PROTO_IPV4);
 	if (IS_ERR(mr4_table)) {
 		err = PTR_ERR(mr4_table);
-		goto err_mr_table_create;
+		goto err_mr4_table_create;
 	}
+	mr6_table = mlxsw_sp_mr_table_create(mlxsw_sp, vr->id,
+					     MLXSW_SP_L3_PROTO_IPV6);
+	if (IS_ERR(mr6_table)) {
+		err = PTR_ERR(mr6_table);
+		goto err_mr6_table_create;
+	}
+
 	vr->fib4 = fib4;
 	vr->fib6 = fib6;
-	vr->mr4_table = mr4_table;
+	vr->mr_table[MLXSW_SP_L3_PROTO_IPV4] = mr4_table;
+	vr->mr_table[MLXSW_SP_L3_PROTO_IPV6] = mr6_table;
 	vr->tb_id = tb_id;
 	return vr;
 
-err_mr_table_create:
+err_mr6_table_create:
+	mlxsw_sp_mr_table_destroy(mr4_table);
+err_mr4_table_create:
 	mlxsw_sp_fib_destroy(mlxsw_sp, fib6);
 err_fib6_create:
 	mlxsw_sp_fib_destroy(mlxsw_sp, fib4);
@@ -830,8 +842,10 @@ static struct mlxsw_sp_vr *mlxsw_sp_vr_create(struct mlxsw_sp *mlxsw_sp,
 static void mlxsw_sp_vr_destroy(struct mlxsw_sp *mlxsw_sp,
 				struct mlxsw_sp_vr *vr)
 {
-	mlxsw_sp_mr_table_destroy(vr->mr4_table);
-	vr->mr4_table = NULL;
+	mlxsw_sp_mr_table_destroy(vr->mr_table[MLXSW_SP_L3_PROTO_IPV6]);
+	vr->mr_table[MLXSW_SP_L3_PROTO_IPV6] = NULL;
+	mlxsw_sp_mr_table_destroy(vr->mr_table[MLXSW_SP_L3_PROTO_IPV4]);
+	vr->mr_table[MLXSW_SP_L3_PROTO_IPV4] = NULL;
 	mlxsw_sp_fib_destroy(mlxsw_sp, vr->fib6);
 	vr->fib6 = NULL;
 	mlxsw_sp_fib_destroy(mlxsw_sp, vr->fib4);
@@ -854,7 +868,8 @@ static void mlxsw_sp_vr_put(struct mlxsw_sp *mlxsw_sp, struct mlxsw_sp_vr *vr)
 {
 	if (!vr->rif_count && list_empty(&vr->fib4->node_list) &&
 	    list_empty(&vr->fib6->node_list) &&
-	    mlxsw_sp_mr_table_empty(vr->mr4_table))
+	    mlxsw_sp_mr_table_empty(vr->mr_table[MLXSW_SP_L3_PROTO_IPV4]) &&
+	    mlxsw_sp_mr_table_empty(vr->mr_table[MLXSW_SP_L3_PROTO_IPV6]))
 		mlxsw_sp_vr_destroy(mlxsw_sp, vr);
 }
 
@@ -5391,7 +5406,7 @@ static int mlxsw_sp_router_fibmr_add(struct mlxsw_sp *mlxsw_sp,
 	if (IS_ERR(vr))
 		return PTR_ERR(vr);
 
-	return mlxsw_sp_mr_route4_add(vr->mr4_table,
+	return mlxsw_sp_mr_route4_add(vr->mr_table[MLXSW_SP_L3_PROTO_IPV4],
 				      (struct mfc_cache *) men_info->mfc,
 				      replace);
 }
@@ -5408,7 +5423,7 @@ static void mlxsw_sp_router_fibmr_del(struct mlxsw_sp *mlxsw_sp,
 	if (WARN_ON(!vr))
 		return;
 
-	mlxsw_sp_mr_route4_del(vr->mr4_table,
+	mlxsw_sp_mr_route4_del(vr->mr_table[MLXSW_SP_L3_PROTO_IPV4],
 			       (struct mfc_cache *) men_info->mfc);
 	mlxsw_sp_vr_put(mlxsw_sp, vr);
 }
@@ -5428,7 +5443,8 @@ mlxsw_sp_router_fibmr_vif_add(struct mlxsw_sp *mlxsw_sp,
 		return PTR_ERR(vr);
 
 	rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, ven_info->dev);
-	return mlxsw_sp_mr_vif_add(vr->mr4_table, ven_info->dev,
+	return mlxsw_sp_mr_vif_add(vr->mr_table[MLXSW_SP_L3_PROTO_IPV4],
+				   ven_info->dev,
 				   ven_info->vif_index,
 				   ven_info->vif_flags, rif);
 }
@@ -5446,7 +5462,8 @@ mlxsw_sp_router_fibmr_vif_del(struct mlxsw_sp *mlxsw_sp,
 	if (WARN_ON(!vr))
 		return;
 
-	mlxsw_sp_mr_vif_del(vr->mr4_table, ven_info->vif_index);
+	mlxsw_sp_mr_vif_del(vr->mr_table[MLXSW_SP_L3_PROTO_IPV4],
+			    ven_info->vif_index);
 	mlxsw_sp_vr_put(mlxsw_sp, vr);
 }
 
@@ -5538,7 +5555,7 @@ static void mlxsw_sp_vr_fib_flush(struct mlxsw_sp *mlxsw_sp,
 
 static void mlxsw_sp_router_fib_flush(struct mlxsw_sp *mlxsw_sp)
 {
-	int i;
+	int i, j;
 
 	for (i = 0; i < MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_VRS); i++) {
 		struct mlxsw_sp_vr *vr = &mlxsw_sp->router->vrs[i];
@@ -5546,7 +5563,8 @@ static void mlxsw_sp_router_fib_flush(struct mlxsw_sp *mlxsw_sp)
 		if (!mlxsw_sp_vr_is_used(vr))
 			continue;
 
-		mlxsw_sp_mr_table_flush(vr->mr4_table);
+		for (j = 0; j < MLXSW_SP_L3_PROTO_MAX; j++)
+			mlxsw_sp_mr_table_flush(vr->mr_table[j]);
 		mlxsw_sp_vr_fib_flush(mlxsw_sp, vr, MLXSW_SP_L3_PROTO_IPV4);
 
 		/* If virtual router was only used for IPv4, then it's no
@@ -6041,7 +6059,7 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	struct mlxsw_sp_rif *rif;
 	struct mlxsw_sp_vr *vr;
 	u16 rif_index;
-	int err;
+	int i, err;
 
 	type = mlxsw_sp_dev_rif_type(mlxsw_sp, params->dev);
 	ops = mlxsw_sp->router->rif_ops_arr[type];
@@ -6081,9 +6099,11 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_configure;
 
-	err = mlxsw_sp_mr_rif_add(vr->mr4_table, rif);
-	if (err)
-		goto err_mr_rif_add;
+	for (i = 0; i < MLXSW_SP_L3_PROTO_MAX; i++) {
+		err = mlxsw_sp_mr_rif_add(vr->mr_table[i], rif);
+		if (err)
+			goto err_mr_rif_add;
+	}
 
 	mlxsw_sp_rif_counters_alloc(rif);
 	mlxsw_sp->router->rifs[rif_index] = rif;
@@ -6091,6 +6111,8 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	return rif;
 
 err_mr_rif_add:
+	for (i--; i >= 0; i--)
+		mlxsw_sp_mr_rif_del(vr->mr_table[i], rif);
 	ops->deconfigure(rif);
 err_configure:
 	if (fid)
@@ -6110,13 +6132,15 @@ void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif)
 	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
 	struct mlxsw_sp_fid *fid = rif->fid;
 	struct mlxsw_sp_vr *vr;
+	int i;
 
 	mlxsw_sp_router_rif_gone_sync(mlxsw_sp, rif);
 	vr = &mlxsw_sp->router->vrs[rif->vr_id];
 
 	mlxsw_sp->router->rifs[rif->rif_index] = NULL;
 	mlxsw_sp_rif_counters_free(rif);
-	mlxsw_sp_mr_rif_del(vr->mr4_table, rif);
+	for (i = 0; i < MLXSW_SP_L3_PROTO_MAX; i++)
+		mlxsw_sp_mr_rif_del(vr->mr_table[i], rif);
 	ops->deconfigure(rif);
 	if (fid)
 		/* Loopback RIFs are not associated with a FID. */
@@ -6523,13 +6547,16 @@ int mlxsw_sp_netdevice_router_port_event(struct net_device *dev)
 
 	if (rif->mtu != dev->mtu) {
 		struct mlxsw_sp_vr *vr;
+		int i;
 
 		/* The RIF is relevant only to its mr_table instance, as unlike
 		 * unicast routing, in multicast routing a RIF cannot be shared
 		 * between several multicast routing tables.
 		 */
 		vr = &mlxsw_sp->router->vrs[rif->vr_id];
-		mlxsw_sp_mr_rif_mtu_update(vr->mr4_table, rif, dev->mtu);
+		for (i = 0; i < MLXSW_SP_L3_PROTO_MAX; i++)
+			mlxsw_sp_mr_rif_mtu_update(vr->mr_table[i],
+						   rif, dev->mtu);
 	}
 
 	ether_addr_copy(rif->addr, dev->dev_addr);

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h

@@ -41,6 +41,7 @@
 enum mlxsw_sp_l3proto {
 	MLXSW_SP_L3_PROTO_IPV4,
 	MLXSW_SP_L3_PROTO_IPV6,
+#define MLXSW_SP_L3_PROTO_MAX	(MLXSW_SP_L3_PROTO_IPV6 + 1)
 };
 
 union mlxsw_sp_l3addr {