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>

1 files changed, 48 insertions, 21 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index be241c708bb9..caa17e0a39fa 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/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 @@ err_fib6_create:
 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);