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 int mlx5_peer_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));
}

static int mlx5_peer_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_peer_pf_init(struct mlx5_core_dev *dev)
{
	int err;

	err = mlx5_peer_pf_enable_hca(dev);
	if (err)
		mlx5_core_err(dev, "Failed to enable peer PF HCA err(%d)\n",
			      err);

	return err;
}

static void mlx5_peer_pf_cleanup(struct mlx5_core_dev *dev)
{
	int err;

	err = mlx5_peer_pf_disable_hca(dev);
	if (err) {
		mlx5_core_err(dev, "Failed to disable peer PF HCA err(%d)\n",
			      err);
		return;
	}

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

int mlx5_ec_init(struct mlx5_core_dev *dev)
{
	int err = 0;

	if (!mlx5_core_is_ecpf(dev))
		return 0;

	/* ECPF shall enable HCA for peer PF in the same way a PF
	 * does this for its VFs.
	 */
	err = mlx5_peer_pf_init(dev);
	if (err)
		return err;

	return 0;
}

void mlx5_ec_cleanup(struct mlx5_core_dev *dev)
{
	if (!mlx5_core_is_ecpf(dev))
		return;

	mlx5_peer_pf_cleanup(dev);
}