drivers/net/ethernet/netronome/nfp/nfp_devlink.c

/*
 * Copyright (C) 2017 Netronome Systems, Inc.
 *
 * This software is dual licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree or the BSD 2-Clause License provided below.  You have the
 * option to license this software under the complete terms of either license.
 *
 * The BSD 2-Clause License:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      1. Redistributions of source code must retain the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer.
 *
 *      2. Redistributions in binary form must reproduce the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer in the documentation and/or other materials
 *         provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/rtnetlink.h>
#include <net/devlink.h>

#include "nfpcore/nfp_nsp.h"
#include "nfp_app.h"
#include "nfp_main.h"
#include "nfp_port.h"

static int
nfp_devlink_fill_eth_port(struct nfp_port *port,
			  struct nfp_eth_table_port *copy)
{
	struct nfp_eth_table_port *eth_port;

	eth_port = __nfp_port_get_eth_port(port);
	if (!eth_port)
		return -EINVAL;

	memcpy(copy, eth_port, sizeof(*eth_port));

	return 0;
}

static int
nfp_devlink_fill_eth_port_from_id(struct nfp_pf *pf, unsigned int port_index,
				  struct nfp_eth_table_port *copy)
{
	struct nfp_port *port;

	port = nfp_port_from_id(pf, NFP_PORT_PHYS_PORT, port_index);

	return nfp_devlink_fill_eth_port(port, copy);
}

static int
nfp_devlink_set_lanes(struct nfp_pf *pf, unsigned int idx, unsigned int lanes)
{
	struct nfp_nsp *nsp;
	int ret;

	nsp = nfp_eth_config_start(pf->cpp, idx);
	if (IS_ERR(nsp))
		return PTR_ERR(nsp);

	ret = __nfp_eth_set_split(nsp, lanes);
	if (ret) {
		nfp_eth_config_cleanup_end(nsp);
		return ret;
	}

	ret = nfp_eth_config_commit_end(nsp);
	if (ret < 0)
		return ret;
	if (ret) /* no change */
		return 0;

	return nfp_net_refresh_port_table_sync(pf);
}

static int
nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
		       unsigned int count)
{
	struct nfp_pf *pf = devlink_priv(devlink);
	struct nfp_eth_table_port eth_port;
	unsigned int lanes;
	int ret;

	if (count < 2)
		return -EINVAL;

	mutex_lock(&pf->lock);

	rtnl_lock();
	ret = nfp_devlink_fill_eth_port_from_id(pf, port_index, &eth_port);
	rtnl_unlock();
	if (ret)
		goto out;

	if (eth_port.is_split || eth_port.port_lanes % count) {
		ret = -EINVAL;
		goto out;
	}

	/* Special case the 100G CXP -> 2x40G split */
	lanes = eth_port.port_lanes / count;
	if (eth_port.lanes == 10 && count == 2)
		lanes = 8 / count;

	ret = nfp_devlink_set_lanes(pf, eth_port.index, lanes);
out:
	mutex_unlock(&pf->lock);

	return ret;
}

static int
nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index)
{
	struct nfp_pf *pf = devlink_priv(devlink);
	struct nfp_eth_table_port eth_port;
	unsigned int lanes;
	int ret;

	mutex_lock(&pf->lock);

	rtnl_lock();
	ret = nfp_devlink_fill_eth_port_from_id(pf, port_index, &eth_port);
	rtnl_unlock();
	if (ret)
		goto out;

	if (!eth_port.is_split) {
		ret = -EINVAL;
		goto out;
	}

	/* Special case the 100G CXP -> 2x40G unsplit */
	lanes = eth_port.port_lanes;
	if (eth_port.port_lanes == 8)
		lanes = 10;

	ret = nfp_devlink_set_lanes(pf, eth_port.index, lanes);
out:
	mutex_unlock(&pf->lock);

	return ret;
}

static int nfp_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
{
	struct nfp_pf *pf = devlink_priv(devlink);
	int ret;

	mutex_lock(&pf->lock);
	if (!pf->app) {
		ret = -EBUSY;
		goto out;
	}
	ret = nfp_app_eswitch_mode_get(pf->app, mode);
out:
	mutex_unlock(&pf->lock);

	return ret;
}

const struct devlink_ops nfp_devlink_ops = {
	.port_split		= nfp_devlink_port_split,
	.port_unsplit		= nfp_devlink_port_unsplit,
	.eswitch_mode_get	= nfp_devlink_eswitch_mode_get,
};

int nfp_devlink_port_register(struct nfp_app *app, struct nfp_port *port)
{
	struct nfp_eth_table_port eth_port;
	struct devlink *devlink;
	int ret;

	rtnl_lock();
	ret = nfp_devlink_fill_eth_port(port, &eth_port);
	rtnl_unlock();
	if (ret)
		return ret;

	devlink_port_type_eth_set(&port->dl_port, port->netdev);
	if (eth_port.is_split)
		devlink_port_split_set(&port->dl_port, eth_port.label_port);

	devlink = priv_to_devlink(app->pf);

	return devlink_port_register(devlink, &port->dl_port, port->eth_id);
}

void nfp_devlink_port_unregister(struct nfp_port *port)
{
	devlink_port_unregister(&port->dl_port);
}