/*
 * 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/bitfield.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if_link.h>
#include <linux/if_ether.h>

#include "nfpcore/nfp_cpp.h"
#include "nfp_app.h"
#include "nfp_main.h"
#include "nfp_net_ctrl.h"
#include "nfp_net.h"
#include "nfp_net_sriov.h"

static int
nfp_net_sriov_check(struct nfp_app *app, int vf, u16 cap, const char *msg)
{
        u16 cap_vf;

        if (!app || !app->pf->vfcfg_tbl2)
                return -EOPNOTSUPP;

        cap_vf = readw(app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_CAP);
        if ((cap_vf & cap) != cap) {
                nfp_warn(app->pf->cpp, "ndo_set_vf_%s not supported\n", msg);
                return -EOPNOTSUPP;
        }

        if (vf < 0 || vf >= app->pf->num_vfs) {
                nfp_warn(app->pf->cpp, "invalid VF id %d\n", vf);
                return -EINVAL;
        }

        return 0;
}

static int
nfp_net_sriov_update(struct nfp_app *app, int vf, u16 update, const char *msg)
{
        struct nfp_net *nn;
        int ret;

        /* Write update info to mailbox in VF config symbol */
        writeb(vf, app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_VF_NUM);
        writew(update, app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_UPD);

        nn = list_first_entry(&app->pf->vnics, struct nfp_net, vnic_list);
        /* Signal VF reconfiguration */
        ret = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_VF);
        if (ret)
                return ret;

        ret = readw(app->pf->vfcfg_tbl2 + NFP_NET_VF_CFG_MB_RET);
        if (ret)
                nfp_warn(app->pf->cpp,
                         "FW refused VF %s update with errno: %d\n", msg, ret);
        return -ret;
}

int nfp_app_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
{
        struct nfp_app *app = nfp_app_from_netdev(netdev);
        unsigned int vf_offset;
        int err;

        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_MAC, "mac");
        if (err)
                return err;

        if (is_multicast_ether_addr(mac)) {
                nfp_warn(app->pf->cpp,
                         "invalid Ethernet address %pM for VF id %d\n",
                         mac, vf);
                return -EINVAL;
        }

        /* Write MAC to VF entry in VF config symbol */
        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
        writel(get_unaligned_be32(mac), app->pf->vfcfg_tbl2 + vf_offset);
        writew(get_unaligned_be16(mac + 4),
               app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_MAC_LO);

        err = nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_MAC, "MAC");
        if (!err)
                nfp_info(app->pf->cpp,
                         "MAC %pM set on VF %d, reload the VF driver to make this change effective.\n",
                         mac, vf);

        return err;
}

int nfp_app_set_vf_vlan(struct net_device *netdev, int vf, u16 vlan, u8 qos,
                        __be16 vlan_proto)
{
        struct nfp_app *app = nfp_app_from_netdev(netdev);
        unsigned int vf_offset;
        u16 vlan_tci;
        int err;

        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_VLAN, "vlan");
        if (err)
                return err;

        if (vlan_proto != htons(ETH_P_8021Q))
                return -EOPNOTSUPP;

        if (vlan > 4095 || qos > 7) {
                nfp_warn(app->pf->cpp,
                         "invalid vlan id or qos for VF id %d\n", vf);
                return -EINVAL;
        }

        /* Write VLAN tag to VF entry in VF config symbol */
        vlan_tci = FIELD_PREP(NFP_NET_VF_CFG_VLAN_VID, vlan) |
                FIELD_PREP(NFP_NET_VF_CFG_VLAN_QOS, qos);
        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
        writew(vlan_tci, app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_VLAN);

        return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_VLAN,
                                    "vlan");
}

int nfp_app_set_vf_spoofchk(struct net_device *netdev, int vf, bool enable)
{
        struct nfp_app *app = nfp_app_from_netdev(netdev);
        unsigned int vf_offset;
        u8 vf_ctrl;
        int err;

        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_SPOOF,
                                  "spoofchk");
        if (err)
                return err;

        /* Write spoof check control bit to VF entry in VF config symbol */
        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ +
                NFP_NET_VF_CFG_CTRL;
        vf_ctrl = readb(app->pf->vfcfg_tbl2 + vf_offset);
        vf_ctrl &= ~NFP_NET_VF_CFG_CTRL_SPOOF;
        vf_ctrl |= FIELD_PREP(NFP_NET_VF_CFG_CTRL_SPOOF, enable);
        writeb(vf_ctrl, app->pf->vfcfg_tbl2 + vf_offset);

        return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_SPOOF,
                                    "spoofchk");
}

int nfp_app_set_vf_link_state(struct net_device *netdev, int vf,
                              int link_state)
{
        struct nfp_app *app = nfp_app_from_netdev(netdev);
        unsigned int vf_offset;
        u8 vf_ctrl;
        int err;

        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_LINK_STATE,
                                  "link_state");
        if (err)
                return err;

        switch (link_state) {
        case IFLA_VF_LINK_STATE_AUTO:
        case IFLA_VF_LINK_STATE_ENABLE:
        case IFLA_VF_LINK_STATE_DISABLE:
                break;
        default:
                return -EINVAL;
        }

        /* Write link state to VF entry in VF config symbol */
        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ +
                NFP_NET_VF_CFG_CTRL;
        vf_ctrl = readb(app->pf->vfcfg_tbl2 + vf_offset);
        vf_ctrl &= ~NFP_NET_VF_CFG_CTRL_LINK_STATE;
        vf_ctrl |= FIELD_PREP(NFP_NET_VF_CFG_CTRL_LINK_STATE, link_state);
        writeb(vf_ctrl, app->pf->vfcfg_tbl2 + vf_offset);

        return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_LINK_STATE,
                                    "link state");
}

int nfp_app_get_vf_config(struct net_device *netdev, int vf,
                          struct ifla_vf_info *ivi)
{
        struct nfp_app *app = nfp_app_from_netdev(netdev);
        unsigned int vf_offset;
        u16 vlan_tci;
        u32 mac_hi;
        u16 mac_lo;
        u8 flags;
        int err;

        err = nfp_net_sriov_check(app, vf, 0, "");
        if (err)
                return err;

        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;

        mac_hi = readl(app->pf->vfcfg_tbl2 + vf_offset);
        mac_lo = readw(app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_MAC_LO);

        flags = readb(app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_CTRL);
        vlan_tci = readw(app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_VLAN);

        memset(ivi, 0, sizeof(*ivi));
        ivi->vf = vf;

        put_unaligned_be32(mac_hi, &ivi->mac[0]);
        put_unaligned_be16(mac_lo, &ivi->mac[4]);

        ivi->vlan = FIELD_GET(NFP_NET_VF_CFG_VLAN_VID, vlan_tci);
        ivi->qos = FIELD_GET(NFP_NET_VF_CFG_VLAN_QOS, vlan_tci);

        ivi->spoofchk = FIELD_GET(NFP_NET_VF_CFG_CTRL_SPOOF, flags);
        ivi->linkstate = FIELD_GET(NFP_NET_VF_CFG_CTRL_LINK_STATE, flags);

        return 0;
}