/*
 * 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/lockdep.h>
#include <linux/netdevice.h>
#include <net/switchdev.h>

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

struct nfp_port *nfp_port_from_netdev(struct net_device *netdev)
{
        if (nfp_netdev_is_nfp_net(netdev)) {
                struct nfp_net *nn = netdev_priv(netdev);

                return nn->port;
        }

        if (nfp_netdev_is_nfp_repr(netdev)) {
                struct nfp_repr *repr = netdev_priv(netdev);

                return repr->port;
        }

        WARN(1, "Unknown netdev type for nfp_port\n");

        return NULL;
}

static int
nfp_port_attr_get(struct net_device *netdev, struct switchdev_attr *attr)
{
        struct nfp_port *port;

        port = nfp_port_from_netdev(netdev);
        if (!port)
                return -EOPNOTSUPP;

        switch (attr->id) {
        case SWITCHDEV_ATTR_ID_PORT_PARENT_ID: {
                const u8 *serial;
                /* N.B: attr->u.ppid.id is binary data */
                attr->u.ppid.id_len = nfp_cpp_serial(port->app->cpp, &serial);
                memcpy(&attr->u.ppid.id, serial, attr->u.ppid.id_len);
                break;
        }
        default:
                return -EOPNOTSUPP;
        }

        return 0;
}

const struct switchdev_ops nfp_port_switchdev_ops = {
        .switchdev_port_attr_get        = nfp_port_attr_get,
};

int nfp_port_setup_tc(struct net_device *netdev, enum tc_setup_type type,
                      void *type_data)
{
        struct nfp_port *port;

        port = nfp_port_from_netdev(netdev);
        if (!port)
                return -EOPNOTSUPP;

        return nfp_app_setup_tc(port->app, netdev, type, type_data);
}

int nfp_port_set_features(struct net_device *netdev, netdev_features_t features)
{
        struct nfp_port *port;

        port = nfp_port_from_netdev(netdev);
        if (!port)
                return 0;

        if ((netdev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC) &&
            port->tc_offload_cnt) {
                netdev_err(netdev, "Cannot disable HW TC offload while offloads active\n");
                return -EBUSY;
        }

        return 0;
}

struct nfp_port *
nfp_port_from_id(struct nfp_pf *pf, enum nfp_port_type type, unsigned int id)
{
        struct nfp_port *port;

        lockdep_assert_held(&pf->lock);

        if (type != NFP_PORT_PHYS_PORT)
                return NULL;

        list_for_each_entry(port, &pf->ports, port_list)
                if (port->eth_id == id)
                        return port;

        return NULL;
}

struct nfp_eth_table_port *__nfp_port_get_eth_port(struct nfp_port *port)
{
        if (!port)
                return NULL;
        if (port->type != NFP_PORT_PHYS_PORT)
                return NULL;

        return port->eth_port;
}

struct nfp_eth_table_port *nfp_port_get_eth_port(struct nfp_port *port)
{
        if (!__nfp_port_get_eth_port(port))
                return NULL;

        if (test_bit(NFP_PORT_CHANGED, &port->flags))
                if (nfp_net_refresh_eth_port(port))
                        return NULL;

        return __nfp_port_get_eth_port(port);
}

int
nfp_port_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
{
        struct nfp_eth_table_port *eth_port;
        struct nfp_port *port;
        int n;

        port = nfp_port_from_netdev(netdev);
        if (!port)
                return -EOPNOTSUPP;

        switch (port->type) {
        case NFP_PORT_PHYS_PORT:
                eth_port = __nfp_port_get_eth_port(port);
                if (!eth_port)
                        return -EOPNOTSUPP;

                if (!eth_port->is_split)
                        n = snprintf(name, len, "p%d", eth_port->label_port);
                else
                        n = snprintf(name, len, "p%ds%d", eth_port->label_port,
                                     eth_port->label_subport);
                break;
        case NFP_PORT_PF_PORT:
                if (!port->pf_split)
                        n = snprintf(name, len, "pf%d", port->pf_id);
                else
                        n = snprintf(name, len, "pf%ds%d", port->pf_id,
                                     port->pf_split_id);
                break;
        case NFP_PORT_VF_PORT:
                n = snprintf(name, len, "pf%dvf%d", port->pf_id, port->vf_id);
                break;
        default:
                return -EOPNOTSUPP;
        }

        if (n >= len)
                return -EINVAL;

        return 0;
}

/**
 * nfp_port_configure() - helper to set the interface configured bit
 * @netdev:     net_device instance
 * @configed:   Desired state
 *
 * Helper to set the ifup/ifdown state on the PHY only if there is a physical
 * interface associated with the netdev.
 *
 * Return:
 * 0 - configuration successful (or no change);
 * -ERRNO - configuration failed.
 */
int nfp_port_configure(struct net_device *netdev, bool configed)
{
        struct nfp_eth_table_port *eth_port;
        struct nfp_port *port;
        int err;

        port = nfp_port_from_netdev(netdev);
        eth_port = __nfp_port_get_eth_port(port);
        if (!eth_port)
                return 0;
        if (port->eth_forced)
                return 0;

        err = nfp_eth_set_configured(port->app->cpp, eth_port->index, configed);
        return err < 0 && err != -EOPNOTSUPP ? err : 0;
}

int nfp_port_init_phy_port(struct nfp_pf *pf, struct nfp_app *app,
                           struct nfp_port *port, unsigned int id)
{
        /* Check if vNIC has external port associated and cfg is OK */
        if (!pf->eth_tbl || id >= pf->eth_tbl->count) {
                nfp_err(app->cpp,
                        "NSP port entries don't match vNICs (no entry %d)\n",
                        id);
                return -EINVAL;
        }
        if (pf->eth_tbl->ports[id].override_changed) {
                nfp_warn(app->cpp,
                         "Config changed for port #%d, reboot required before port will be operational\n",
                         pf->eth_tbl->ports[id].index);
                port->type = NFP_PORT_INVALID;
                return 0;
        }

        port->eth_port = &pf->eth_tbl->ports[id];
        port->eth_id = pf->eth_tbl->ports[id].index;
        if (pf->mac_stats_mem)
                port->eth_stats =
                        pf->mac_stats_mem + port->eth_id * NFP_MAC_STATS_SIZE;

        return 0;
}

struct nfp_port *
nfp_port_alloc(struct nfp_app *app, enum nfp_port_type type,
               struct net_device *netdev)
{
        struct nfp_port *port;

        port = kzalloc(sizeof(*port), GFP_KERNEL);
        if (!port)
                return ERR_PTR(-ENOMEM);

        port->netdev = netdev;
        port->type = type;
        port->app = app;

        list_add_tail(&port->port_list, &app->pf->ports);

        return port;
}

void nfp_port_free(struct nfp_port *port)
{
        if (!port)
                return;
        list_del(&port->port_list);
        kfree(port);
}