[PATCH net-next V3 03/16] net/mlx5: E-Switch, Add miss rule for offloads mode

[Saeed Mahameed]

From: Or Gerlitz <ogerl...@mellanox.com>

In the sriov offloads mode, packets that are not matched by any other
rule should be sent towards the e-switch manager for further processing.

Add such "miss" rule which matches ANY packet as the last rule in the
e-switch FDB and programs the HW to send the packet to vport 0 where
the e-switch manager runs.

Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eswitch.h  |  1 +
 .../ethernet/mellanox/mlx5/core/eswitch_offloads.c | 40 ++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h 
b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 2360180..8eed33f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -144,6 +144,7 @@ struct mlx5_eswitch_fdb {
                struct offloads_fdb {
                        struct mlx5_flow_group *send_to_vport_grp;
                        struct mlx5_flow_group *miss_grp;
+                       struct mlx5_flow_rule  *miss_rule;
                } offloads;
        };
 };
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c 
b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index c6b28df..e3d81ae 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -38,6 +38,39 @@
 #include "mlx5_core.h"
 #include "eswitch.h"
 
+static int esw_add_fdb_miss_rule(struct mlx5_eswitch *esw)
+{
+       struct mlx5_flow_destination dest;
+       struct mlx5_flow_rule *flow_rule = NULL;
+       u32 *match_v, *match_c;
+       int err = 0;
+
+       match_v = kzalloc(MLX5_ST_SZ_BYTES(fte_match_param), GFP_KERNEL);
+       match_c = kzalloc(MLX5_ST_SZ_BYTES(fte_match_param), GFP_KERNEL);
+       if (!match_v || !match_c) {
+               esw_warn(esw->dev, "FDB: Failed to alloc match parameters\n");
+               err = -ENOMEM;
+               goto out;
+       }
+
+       dest.type = MLX5_FLOW_DESTINATION_TYPE_VPORT;
+       dest.vport_num = 0;
+
+       flow_rule = mlx5_add_flow_rule(esw->fdb_table.fdb, 0, match_c, match_v,
+                                      MLX5_FLOW_CONTEXT_ACTION_FWD_DEST, 0, 
&dest);
+       if (IS_ERR(flow_rule)) {
+               err = PTR_ERR(flow_rule);
+               esw_warn(esw->dev,  "FDB: Failed to add miss flow rule err 
%d\n", err);
+               goto out;
+       }
+
+       esw->fdb_table.offloads.miss_rule = flow_rule;
+out:
+       kfree(match_v);
+       kfree(match_c);
+       return err;
+}
+
 #define MAX_PF_SQ 256
 
 int esw_create_offloads_fdb_table(struct mlx5_eswitch *esw, int nvports)
@@ -110,8 +143,14 @@ int esw_create_offloads_fdb_table(struct mlx5_eswitch 
*esw, int nvports)
        }
        esw->fdb_table.offloads.miss_grp = g;
 
+       err = esw_add_fdb_miss_rule(esw);
+       if (err)
+               goto miss_rule_err;
+
        return 0;
 
+miss_rule_err:
+       mlx5_destroy_flow_group(esw->fdb_table.offloads.miss_grp);
 miss_err:
        mlx5_destroy_flow_group(esw->fdb_table.offloads.send_to_vport_grp);
 send_vport_err:
@@ -128,6 +167,7 @@ void esw_destroy_offloads_fdb_table(struct mlx5_eswitch 
*esw)
                return;
 
        esw_debug(esw->dev, "Destroy offloads FDB Table\n");
+       mlx5_del_flow_rule(esw->fdb_table.offloads.miss_rule);
        mlx5_destroy_flow_group(esw->fdb_table.offloads.send_to_vport_grp);
        mlx5_destroy_flow_group(esw->fdb_table.offloads.miss_grp);
 
-- 
2.8.0