net/mlx5: HWS, added vport handling

Vport is a virtual eswitch port that is associated with its virtual
function (VF), physical function (PF) or sub-function (SF).
This patch adds handling of vports in HWS.

Reviewed-by: Hamdan Agbariya <[email protected]>
Signed-off-by: Yevgeny Kliteynik <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: kliteyn

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_vport.c

@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
+
+#include "mlx5hws_internal.h"
+
+int mlx5hws_vport_init_vports(struct mlx5hws_context *ctx)
+{
+	int ret;
+
+	if (!ctx->caps->eswitch_manager)
+		return 0;
+
+	xa_init(&ctx->vports.vport_gvmi_xa);
+
+	/* Set gvmi for eswitch manager and uplink vports only. Rest of the vports
+	 * (vport 0 of other function, VFs and SFs) will be queried dynamically.
+	 */
+
+	ret = mlx5hws_cmd_query_gvmi(ctx->mdev, false, 0, &ctx->vports.esw_manager_gvmi);
+	if (ret)
+		return ret;
+
+	ctx->vports.uplink_gvmi = 0;
+	return 0;
+}
+
+void mlx5hws_vport_uninit_vports(struct mlx5hws_context *ctx)
+{
+	if (ctx->caps->eswitch_manager)
+		xa_destroy(&ctx->vports.vport_gvmi_xa);
+}
+
+static int hws_vport_add_gvmi(struct mlx5hws_context *ctx, u16 vport)
+{
+	u16 vport_gvmi;
+	int ret;
+
+	ret = mlx5hws_cmd_query_gvmi(ctx->mdev, true, vport, &vport_gvmi);
+	if (ret)
+		return -EINVAL;
+
+	ret = xa_insert(&ctx->vports.vport_gvmi_xa, vport,
+			xa_mk_value(vport_gvmi), GFP_KERNEL);
+	if (ret)
+		mlx5hws_dbg(ctx, "Couldn't insert new vport gvmi into xarray (%d)\n", ret);
+
+	return ret;
+}
+
+static bool hws_vport_is_esw_mgr_vport(struct mlx5hws_context *ctx, u16 vport)
+{
+	return ctx->caps->is_ecpf ? vport == MLX5_VPORT_ECPF :
+				    vport == MLX5_VPORT_PF;
+}
+
+int mlx5hws_vport_get_gvmi(struct mlx5hws_context *ctx, u16 vport, u16 *vport_gvmi)
+{
+	void *entry;
+	int ret;
+
+	if (!ctx->caps->eswitch_manager)
+		return -EINVAL;
+
+	if (hws_vport_is_esw_mgr_vport(ctx, vport)) {
+		*vport_gvmi = ctx->vports.esw_manager_gvmi;
+		return 0;
+	}
+
+	if (vport == MLX5_VPORT_UPLINK) {
+		*vport_gvmi = ctx->vports.uplink_gvmi;
+		return 0;
+	}
+
+load_entry:
+	entry = xa_load(&ctx->vports.vport_gvmi_xa, vport);
+
+	if (!xa_is_value(entry)) {
+		ret = hws_vport_add_gvmi(ctx, vport);
+		if (ret && ret != -EBUSY)
+			return ret;
+		goto load_entry;
+	}
+
+	*vport_gvmi = (u16)xa_to_value(entry);
+	return 0;
+}

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_vport.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
+
+#ifndef MLX5HWS_VPORT_H_
+#define MLX5HWS_VPORT_H_
+
+int mlx5hws_vport_init_vports(struct mlx5hws_context *ctx);
+
+void mlx5hws_vport_uninit_vports(struct mlx5hws_context *ctx);
+
+int mlx5hws_vport_get_gvmi(struct mlx5hws_context *ctx, u16 vport, u16 *vport_gvmi);
+
+#endif /* MLX5HWS_VPORT_H_ */