[PATCH mlx5-next 5/8] net/mlx5: E-switch, modify peer miss rule index to vhca_id

[Tariq Toukan <tariqt@nvidia.com>]

From: Shay Drory <shayd@nvidia.com>

Replace the fixed-size array peer_miss_rules[MLX5_MAX_PORTS], indexed
by physical function index, with an xarray indexed by vhca_id.

This decouples peer_miss_rules from mlx5_get_dev_index(), removing the
dependency on a PF-derived index and the arbitrary MLX5_MAX_PORTS bounds
check. Using vhca_id as the key simplifies insertion/removal logic and
scales better across multi-peer topologies.

Initialize and destroy the xarray alongside the existing esw->paired
xarray in mlx5_esw_offloads_devcom_init/cleanup respectively.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/eswitch.h |  2 +-
 .../mellanox/mlx5/core/eswitch_offloads.c     | 20 +++++++++----------
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 6841caef02d1..96309a732d50 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -273,7 +273,7 @@ struct mlx5_eswitch_fdb {
 			struct mlx5_flow_group *send_to_vport_grp;
 			struct mlx5_flow_group *send_to_vport_meta_grp;
 			struct mlx5_flow_group *peer_miss_grp;
-			struct mlx5_flow_handle **peer_miss_rules[MLX5_MAX_PORTS];
+			struct xarray peer_miss_rules;
 			struct mlx5_flow_group *miss_grp;
 			struct mlx5_flow_handle **send_to_vport_meta_rules;
 			struct mlx5_flow_handle *miss_rule_uni;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 1366f6e489bd..90e6f97bdf4a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -1190,7 +1190,7 @@ static int esw_add_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 	struct mlx5_flow_handle *flow;
 	struct mlx5_vport *peer_vport;
 	struct mlx5_flow_spec *spec;
-	int err, pfindex;
+	int err;
 	unsigned long i;
 	void *misc;
 
@@ -1274,14 +1274,10 @@ static int esw_add_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 		}
 	}
 
-	pfindex = mlx5_get_dev_index(peer_dev);
-	if (pfindex >= MLX5_MAX_PORTS) {
-		esw_warn(esw->dev, "Peer dev index(%d) is over the max num defined(%d)\n",
-			 pfindex, MLX5_MAX_PORTS);
-		err = -EINVAL;
+	err = xa_insert(&esw->fdb_table.offloads.peer_miss_rules,
+			MLX5_CAP_GEN(peer_dev, vhca_id), flows, GFP_KERNEL);
+	if (err)
 		goto add_ec_vf_flow_err;
-	}
-	esw->fdb_table.offloads.peer_miss_rules[pfindex] = flows;
 
 	kvfree(spec);
 	return 0;
@@ -1323,12 +1319,13 @@ static void esw_del_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 					struct mlx5_core_dev *peer_dev)
 {
 	struct mlx5_eswitch *peer_esw = peer_dev->priv.eswitch;
-	u16 peer_index = mlx5_get_dev_index(peer_dev);
+	u16 peer_vhca_id = MLX5_CAP_GEN(peer_dev, vhca_id);
 	struct mlx5_flow_handle **flows;
 	struct mlx5_vport *peer_vport;
 	unsigned long i;
 
-	flows = esw->fdb_table.offloads.peer_miss_rules[peer_index];
+	flows = xa_erase(&esw->fdb_table.offloads.peer_miss_rules,
+			 peer_vhca_id);
 	if (!flows)
 		return;
 
@@ -1353,7 +1350,6 @@ static void esw_del_fdb_peer_miss_rules(struct mlx5_eswitch *esw,
 	}
 
 	kvfree(flows);
-	esw->fdb_table.offloads.peer_miss_rules[peer_index] = NULL;
 }
 
 static int esw_add_fdb_miss_rule(struct mlx5_eswitch *esw)
@@ -3250,6 +3246,7 @@ void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw,
 		return;
 
 	xa_init(&esw->paired);
+	xa_init(&esw->fdb_table.offloads.peer_miss_rules);
 	esw->num_peers = 0;
 	esw->devcom = mlx5_devcom_register_component(esw->dev->priv.devc,
 						     MLX5_DEVCOM_ESW_OFFLOADS,
@@ -3277,6 +3274,7 @@ void mlx5_esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw)
 
 	mlx5_devcom_unregister_component(esw->devcom);
 	xa_destroy(&esw->paired);
+	xa_destroy(&esw->fdb_table.offloads.peer_miss_rules);
 	esw->devcom = NULL;
 }
 
-- 
2.44.0