netdev - [PATCH net-next 09/10] mlxsw: spectrum_router: Set offload

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Date:   Sun,  7 Feb 2021 10:22:57 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, dsahern@...il.com,
        jiri@...dia.com, yoshfuji@...ux-ipv6.org, amcohen@...dia.com,
        roopa@...dia.com, bpoirier@...dia.com, sharpd@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 09/10] mlxsw: spectrum_router: Set offload_failed flag

From: Amit Cohen <amcohen@...dia.com>

When FIB_EVENT_ENTRY_{REPLACE, APPEND} are triggered and route insertion
fails, FIB abort is triggered.

After aborting, set the appropriate hardware flag to make the kernel emit
RTM_NEWROUTE notification with RTM_F_OFFLOAD_FAILED flag.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_router.c | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index a5f980b6940e..9ce90841f92d 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -4942,6 +4942,25 @@ mlxsw_sp_rt6_nexthop(struct mlxsw_sp_nexthop_group *nh_grp,
 	return NULL;
 }
 
+static void
+mlxsw_sp_fib4_offload_failed_flag_set(struct mlxsw_sp *mlxsw_sp,
+				      struct fib_entry_notifier_info *fen_info)
+{
+	u32 *p_dst = (u32 *) &fen_info->dst;
+	struct fib_rt_info fri;
+
+	fri.fi = fen_info->fi;
+	fri.tb_id = fen_info->tb_id;
+	fri.dst = cpu_to_be32(*p_dst);
+	fri.dst_len = fen_info->dst_len;
+	fri.tos = fen_info->tos;
+	fri.type = fen_info->type;
+	fri.offload = false;
+	fri.trap = false;
+	fri.offload_failed = true;
+	fib_alias_hw_flags_set(mlxsw_sp_net(mlxsw_sp), &fri);
+}
+
 static void
 mlxsw_sp_fib4_entry_hw_flags_set(struct mlxsw_sp *mlxsw_sp,
 				 struct mlxsw_sp_fib_entry *fib_entry)
@@ -4990,6 +5009,30 @@ mlxsw_sp_fib4_entry_hw_flags_clear(struct mlxsw_sp *mlxsw_sp,
 	fib_alias_hw_flags_set(mlxsw_sp_net(mlxsw_sp), &fri);
 }
 
+#if IS_ENABLED(CONFIG_IPV6)
+static void
+mlxsw_sp_fib6_offload_failed_flag_set(struct mlxsw_sp *mlxsw_sp,
+				      struct fib6_info **rt_arr,
+				      unsigned int nrt6)
+{
+	int i;
+
+	/* In IPv6 a multipath route is represented using multiple routes, so
+	 * we need to set the flags on all of them.
+	 */
+	for (i = 0; i < nrt6; i++)
+		fib6_info_hw_flags_set(mlxsw_sp_net(mlxsw_sp), rt_arr[i],
+				       false, false, true);
+}
+#else
+static void
+mlxsw_sp_fib6_offload_failed_flag_set(struct mlxsw_sp *mlxsw_sp,
+				      struct fib6_info **rt_arr,
+				      unsigned int nrt6)
+{
+}
+#endif
+
 #if IS_ENABLED(CONFIG_IPV6)
 static void
 mlxsw_sp_fib6_entry_hw_flags_set(struct mlxsw_sp *mlxsw_sp,
@@ -7023,6 +7066,8 @@ static void mlxsw_sp_router_fib4_event_process(struct mlxsw_sp *mlxsw_sp,
 		if (err) {
 			mlxsw_sp_fib_entry_op_ctx_priv_put_all(op_ctx);
 			mlxsw_sp_router_fib_abort(mlxsw_sp);
+			mlxsw_sp_fib4_offload_failed_flag_set(mlxsw_sp,
+							      &fib_event->fen_info);
 		}
 		fib_info_put(fib_event->fen_info.fi);
 		break;
@@ -7044,6 +7089,7 @@ static void mlxsw_sp_router_fib6_event_process(struct mlxsw_sp *mlxsw_sp,
 					       struct mlxsw_sp_fib_entry_op_ctx *op_ctx,
 					       struct mlxsw_sp_fib_event *fib_event)
 {
+	struct mlxsw_sp_fib6_event *fib6_event = &fib_event->fib6_event;
 	int err;
 
 	mlxsw_sp_span_respin(mlxsw_sp);
@@ -7055,6 +7101,9 @@ static void mlxsw_sp_router_fib6_event_process(struct mlxsw_sp *mlxsw_sp,
 		if (err) {
 			mlxsw_sp_fib_entry_op_ctx_priv_put_all(op_ctx);
 			mlxsw_sp_router_fib_abort(mlxsw_sp);
+			mlxsw_sp_fib6_offload_failed_flag_set(mlxsw_sp,
+							      fib6_event->rt_arr,
+							      fib6_event->nrt6);
 		}
 		mlxsw_sp_router_fib6_event_fini(&fib_event->fib6_event);
 		break;
@@ -7064,6 +7113,9 @@ static void mlxsw_sp_router_fib6_event_process(struct mlxsw_sp *mlxsw_sp,
 		if (err) {
 			mlxsw_sp_fib_entry_op_ctx_priv_put_all(op_ctx);
 			mlxsw_sp_router_fib_abort(mlxsw_sp);
+			mlxsw_sp_fib6_offload_failed_flag_set(mlxsw_sp,
+							      fib6_event->rt_arr,
+							      fib6_event->nrt6);
 		}
 		mlxsw_sp_router_fib6_event_fini(&fib_event->fib6_event);
 		break;
-- 
2.29.2