Merge branch 'mlxsw-fixes'

Ido Schimmel says:

====================
mlxsw fixes

This patch set contains various fixes for mlxsw.

Patches #1-#2 fix two trap related issues introduced in previous cycle.

Patches #3-#5 fix rare use-after-frees discovered by syzkaller. After
over a week of fuzzing with the fixes, the bugs did not reproduce.

Patch #6 from Amit fixes an issue in the ethtool selftest that was
recently discovered after running the test on a new platform that
supports only 1Gbps and 10Gbps speeds.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/devlink/devlink-trap.rst

@@ -486,6 +486,10 @@ narrow. The description of these groups must be added to the following table:
      - Contains packet traps for packets that should be locally delivered after
        routing, but do not match more specific packet traps (e.g.,
        ``ipv4_bgp``)
+   * - ``external_delivery``
+     - Contains packet traps for packets that should be routed through an
+       external interface (e.g., management interface) that does not belong to
+       the same device (e.g., switch ASIC) as the ingress interface
    * - ``ipv6``
      - Contains packet traps for various IPv6 control packets (e.g., Router
        Advertisements)

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

@@ -1814,7 +1814,7 @@ static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
 	err = mlxsw_emad_reg_access(mlxsw_core, reg, payload, type, trans,
 				    bulk_list, cb, cb_priv, tid);
 	if (err) {
-		kfree(trans);
+		kfree_rcu(trans, rcu);
 		return err;
 	}
 	return 0;
@@ -2051,11 +2051,13 @@ void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb,
 			break;
 		}
 	}
+	if (!found) {
 		rcu_read_unlock();
-	if (!found)
 		goto drop;
+	}
 
 	rxl->func(skb, local_port, rxl_item->priv);
+	rcu_read_unlock();
 	return;
 
 drop:

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

@@ -5536,6 +5536,7 @@ enum mlxsw_reg_htgt_trap_group {
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_MULTICAST,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_NEIGH_DISCOVERY,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_ROUTER_EXP,
+	MLXSW_REG_HTGT_TRAP_GROUP_SP_EXTERNAL_ROUTE,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_IP2ME,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_DHCP,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_EVENT,

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

@@ -5001,15 +5001,6 @@ static void mlxsw_sp_router_fib4_del(struct mlxsw_sp *mlxsw_sp,
 
 static bool mlxsw_sp_fib6_rt_should_ignore(const struct fib6_info *rt)
 {
-	/* Packets with link-local destination IP arriving to the router
-	 * are trapped to the CPU, so no need to program specific routes
-	 * for them. Only allow prefix routes (usually one fe80::/64) so
-	 * that packets are trapped for the right reason.
-	 */
-	if ((ipv6_addr_type(&rt->fib6_dst.addr) & IPV6_ADDR_LINKLOCAL) &&
-	    (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)))
-		return true;
-
 	/* Multicast routes aren't supported, so ignore them. Neighbour
 	 * Discovery packets are specifically trapped.
 	 */
@@ -8078,16 +8069,6 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 	mlxsw_sp->router = router;
 	router->mlxsw_sp = mlxsw_sp;
 
-	router->inetaddr_nb.notifier_call = mlxsw_sp_inetaddr_event;
-	err = register_inetaddr_notifier(&router->inetaddr_nb);
-	if (err)
-		goto err_register_inetaddr_notifier;
-
-	router->inet6addr_nb.notifier_call = mlxsw_sp_inet6addr_event;
-	err = register_inet6addr_notifier(&router->inet6addr_nb);
-	if (err)
-		goto err_register_inet6addr_notifier;
-
 	INIT_LIST_HEAD(&mlxsw_sp->router->nexthop_neighs_list);
 	err = __mlxsw_sp_router_init(mlxsw_sp);
 	if (err)
@@ -8128,12 +8109,6 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_neigh_init;
 
-	mlxsw_sp->router->netevent_nb.notifier_call =
-		mlxsw_sp_router_netevent_event;
-	err = register_netevent_notifier(&mlxsw_sp->router->netevent_nb);
-	if (err)
-		goto err_register_netevent_notifier;
-
 	err = mlxsw_sp_mp_hash_init(mlxsw_sp);
 	if (err)
 		goto err_mp_hash_init;
@@ -8142,6 +8117,22 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_dscp_init;
 
+	router->inetaddr_nb.notifier_call = mlxsw_sp_inetaddr_event;
+	err = register_inetaddr_notifier(&router->inetaddr_nb);
+	if (err)
+		goto err_register_inetaddr_notifier;
+
+	router->inet6addr_nb.notifier_call = mlxsw_sp_inet6addr_event;
+	err = register_inet6addr_notifier(&router->inet6addr_nb);
+	if (err)
+		goto err_register_inet6addr_notifier;
+
+	mlxsw_sp->router->netevent_nb.notifier_call =
+		mlxsw_sp_router_netevent_event;
+	err = register_netevent_notifier(&mlxsw_sp->router->netevent_nb);
+	if (err)
+		goto err_register_netevent_notifier;
+
 	mlxsw_sp->router->fib_nb.notifier_call = mlxsw_sp_router_fib_event;
 	err = register_fib_notifier(mlxsw_sp_net(mlxsw_sp),
 				    &mlxsw_sp->router->fib_nb,
@@ -8152,10 +8143,15 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 
 err_register_fib_notifier:
-err_dscp_init:
-err_mp_hash_init:
 	unregister_netevent_notifier(&mlxsw_sp->router->netevent_nb);
 err_register_netevent_notifier:
+	unregister_inet6addr_notifier(&router->inet6addr_nb);
+err_register_inet6addr_notifier:
+	unregister_inetaddr_notifier(&router->inetaddr_nb);
+err_register_inetaddr_notifier:
+	mlxsw_core_flush_owq();
+err_dscp_init:
+err_mp_hash_init:
 	mlxsw_sp_neigh_fini(mlxsw_sp);
 err_neigh_init:
 	mlxsw_sp_vrs_fini(mlxsw_sp);
@@ -8174,10 +8170,6 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
 err_rifs_init:
 	__mlxsw_sp_router_fini(mlxsw_sp);
 err_router_init:
-	unregister_inet6addr_notifier(&router->inet6addr_nb);
-err_register_inet6addr_notifier:
-	unregister_inetaddr_notifier(&router->inetaddr_nb);
-err_register_inetaddr_notifier:
 	mutex_destroy(&mlxsw_sp->router->lock);
 	kfree(mlxsw_sp->router);
 	return err;
@@ -8188,6 +8180,9 @@ void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
 	unregister_fib_notifier(mlxsw_sp_net(mlxsw_sp),
 				&mlxsw_sp->router->fib_nb);
 	unregister_netevent_notifier(&mlxsw_sp->router->netevent_nb);
+	unregister_inet6addr_notifier(&mlxsw_sp->router->inet6addr_nb);
+	unregister_inetaddr_notifier(&mlxsw_sp->router->inetaddr_nb);
+	mlxsw_core_flush_owq();
 	mlxsw_sp_neigh_fini(mlxsw_sp);
 	mlxsw_sp_vrs_fini(mlxsw_sp);
 	mlxsw_sp_mr_fini(mlxsw_sp);
@@ -8197,8 +8192,6 @@ void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
 	mlxsw_sp_ipips_fini(mlxsw_sp);
 	mlxsw_sp_rifs_fini(mlxsw_sp);
 	__mlxsw_sp_router_fini(mlxsw_sp);
-	unregister_inet6addr_notifier(&mlxsw_sp->router->inet6addr_nb);
-	unregister_inetaddr_notifier(&mlxsw_sp->router->inetaddr_nb);
 	mutex_destroy(&mlxsw_sp->router->lock);
 	kfree(mlxsw_sp->router);
 }

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

@@ -328,6 +328,9 @@ mlxsw_sp_trap_policer_items_arr[] = {
 	{
 		.policer = MLXSW_SP_TRAP_POLICER(18, 1024, 128),
 	},
+	{
+		.policer = MLXSW_SP_TRAP_POLICER(19, 1024, 512),
+	},
 };
 
 static const struct mlxsw_sp_trap_group_item mlxsw_sp_trap_group_items_arr[] = {
@@ -421,6 +424,11 @@ static const struct mlxsw_sp_trap_group_item mlxsw_sp_trap_group_items_arr[] = {
 		.hw_group_id = MLXSW_REG_HTGT_TRAP_GROUP_SP_IP2ME,
 		.priority = 2,
 	},
+	{
+		.group = DEVLINK_TRAP_GROUP_GENERIC(EXTERNAL_DELIVERY, 19),
+		.hw_group_id = MLXSW_REG_HTGT_TRAP_GROUP_SP_EXTERNAL_ROUTE,
+		.priority = 1,
+	},
 	{
 		.group = DEVLINK_TRAP_GROUP_GENERIC(IPV6, 15),
 		.hw_group_id = MLXSW_REG_HTGT_TRAP_GROUP_SP_IPV6,
@@ -882,11 +890,11 @@ static const struct mlxsw_sp_trap_item mlxsw_sp_trap_items_arr[] = {
 		},
 	},
 	{
-		.trap = MLXSW_SP_TRAP_CONTROL(EXTERNAL_ROUTE, LOCAL_DELIVERY,
+		.trap = MLXSW_SP_TRAP_CONTROL(EXTERNAL_ROUTE, EXTERNAL_DELIVERY,
 					      TRAP),
 		.listeners_arr = {
-			MLXSW_SP_RXL_MARK(RTR_INGRESS0, IP2ME, TRAP_TO_CPU,
-					  false),
+			MLXSW_SP_RXL_MARK(RTR_INGRESS0, EXTERNAL_ROUTE,
+					  TRAP_TO_CPU, false),
 		},
 	},
 	{

include/net/devlink.h

@@ -718,6 +718,7 @@ enum devlink_trap_group_generic_id {
 	DEVLINK_TRAP_GROUP_GENERIC_ID_PIM,
 	DEVLINK_TRAP_GROUP_GENERIC_ID_UC_LB,
 	DEVLINK_TRAP_GROUP_GENERIC_ID_LOCAL_DELIVERY,
+	DEVLINK_TRAP_GROUP_GENERIC_ID_EXTERNAL_DELIVERY,
 	DEVLINK_TRAP_GROUP_GENERIC_ID_IPV6,
 	DEVLINK_TRAP_GROUP_GENERIC_ID_PTP_EVENT,
 	DEVLINK_TRAP_GROUP_GENERIC_ID_PTP_GENERAL,
@@ -915,6 +916,8 @@ enum devlink_trap_group_generic_id {
 	"uc_loopback"
 #define DEVLINK_TRAP_GROUP_GENERIC_NAME_LOCAL_DELIVERY \
 	"local_delivery"
+#define DEVLINK_TRAP_GROUP_GENERIC_NAME_EXTERNAL_DELIVERY \
+	"external_delivery"
 #define DEVLINK_TRAP_GROUP_GENERIC_NAME_IPV6 \
 	"ipv6"
 #define DEVLINK_TRAP_GROUP_GENERIC_NAME_PTP_EVENT \

net/core/devlink.c

@@ -8567,6 +8567,7 @@ static const struct devlink_trap_group devlink_trap_group_generic[] = {
 	DEVLINK_TRAP_GROUP(PIM),
 	DEVLINK_TRAP_GROUP(UC_LB),
 	DEVLINK_TRAP_GROUP(LOCAL_DELIVERY),
+	DEVLINK_TRAP_GROUP(EXTERNAL_DELIVERY),
 	DEVLINK_TRAP_GROUP(IPV6),
 	DEVLINK_TRAP_GROUP(PTP_EVENT),
 	DEVLINK_TRAP_GROUP(PTP_GENERAL),

tools/testing/selftests/net/forwarding/ethtool.sh

@@ -252,8 +252,6 @@ check_highest_speed_is_chosen()
 	fi
 
 	local -a speeds_arr=($(common_speeds_get $h1 $h2 0 1))
-	# Remove the first speed, h1 does not advertise this speed.
-	unset speeds_arr[0]
 
 	max_speed=${speeds_arr[0]}
 	for current in ${speeds_arr[@]}; do