drivers/net/ethernet/mellanox/mlx5/core/ecpf.c

/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/* Copyright (c) 2019 Mellanox Technologies. */

#include "ecpf.h"

bool mlx5_read_embedded_cpu(struct mlx5_core_dev *dev)
{
	return (ioread32be(&dev->iseg->initializing) >> MLX5_ECPU_BIT_NUM) & 1;
}

static bool mlx5_ecpf_esw_admins_host_pf(const struct mlx5_core_dev *dev)
{
	/* In separate host mode, PF enables itself.
	 * When ECPF is eswitch manager, eswitch enables host PF after
	 * eswitch is setup.
	 */
	return mlx5_core_is_ecpf_esw_manager(dev);
}

int mlx5_cmd_host_pf_enable_hca(struct mlx5_core_dev *dev)
{
	u32 out[MLX5_ST_SZ_DW(enable_hca_out)] = {};
	u32 in[MLX5_ST_SZ_DW(enable_hca_in)]   = {};

	MLX5_SET(enable_hca_in, in, opcode, MLX5_CMD_OP_ENABLE_HCA);
	MLX5_SET(enable_hca_in, in, function_id, 0);
	MLX5_SET(enable_hca_in, in, embedded_cpu_function, 0);
	return mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
}

int mlx5_cmd_host_pf_disable_hca(struct mlx5_core_dev *dev)
{
	u32 out[MLX5_ST_SZ_DW(disable_hca_out)] = {};
	u32 in[MLX5_ST_SZ_DW(disable_hca_in)]   = {};

	MLX5_SET(disable_hca_in, in, opcode, MLX5_CMD_OP_DISABLE_HCA);
	MLX5_SET(disable_hca_in, in, function_id, 0);
	MLX5_SET(disable_hca_in, in, embedded_cpu_function, 0);
	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}

static int mlx5_host_pf_init(struct mlx5_core_dev *dev)
{
	int err;

	if (mlx5_ecpf_esw_admins_host_pf(dev))
		return 0;

	/* ECPF shall enable HCA for host PF in the same way a PF
	 * does this for its VFs when ECPF is not a eswitch manager.
	 */
	err = mlx5_cmd_host_pf_enable_hca(dev);
	if (err)
		mlx5_core_err(dev, "Failed to enable external host PF HCA err(%d)\n", err);

	return err;
}

static void mlx5_host_pf_cleanup(struct mlx5_core_dev *dev)
{
	int err;

	if (mlx5_ecpf_esw_admins_host_pf(dev))
		return;

	err = mlx5_cmd_host_pf_disable_hca(dev);
	if (err) {
		mlx5_core_err(dev, "Failed to disable external host PF HCA err(%d)\n", err);
		return;
	}
}

int mlx5_ec_init(struct mlx5_core_dev *dev)
{
	if (!mlx5_core_is_ecpf(dev))
		return 0;

	return mlx5_host_pf_init(dev);
}

void mlx5_ec_cleanup(struct mlx5_core_dev *dev)
{
	int err;

	if (!mlx5_core_is_ecpf(dev))
		return;

	mlx5_host_pf_cleanup(dev);

	err = mlx5_wait_for_pages(dev, &dev->priv.host_pf_pages);
	if (err)
		mlx5_core_warn(dev, "Timeout reclaiming external host PF pages err(%d)\n", err);
}