// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */

#include <linux/lockdep.h>
#include <linux/netdevice.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;
}

int nfp_port_get_port_parent_id(struct net_device *netdev,
                                struct netdev_phys_item_id *ppid)
{
        struct nfp_port *port;
        const u8 *serial;

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

        ppid->id_len = nfp_cpp_serial(port->app->cpp, &serial);
        memcpy(&ppid->id, serial, ppid->id_len);

        return 0;
}

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);
}