// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2019 Netronome Systems, Inc. */

#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, bool warn)
{
        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) {
                if (warn)
                        nfp_warn(app->pf->cpp, "ndo_set_vf_%s not supported\n", msg);
                return -EOPNOTSUPP;
        }

        if (vf < 0 || vf >= app->pf->num_vfs) {
                if (warn)
                        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", true);
        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);
        u16 update = NFP_NET_VF_CFG_MB_UPD_VLAN;
        bool is_proto_sup = true;
        unsigned int vf_offset;
        u32 vlan_tag;
        int err;

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

        if (!eth_type_vlan(vlan_proto))
                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;
        }

        /* Check if fw supports or not */
        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_VLAN_PROTO, "vlan_proto", true);
        if (err)
                is_proto_sup = false;

        if (vlan_proto != htons(ETH_P_8021Q)) {
                if (!is_proto_sup)
                        return -EOPNOTSUPP;
                update |= NFP_NET_VF_CFG_MB_UPD_VLAN_PROTO;
        }

        /* Write VLAN tag to VF entry in VF config symbol */
        vlan_tag = FIELD_PREP(NFP_NET_VF_CFG_VLAN_VID, vlan) |
                FIELD_PREP(NFP_NET_VF_CFG_VLAN_QOS, qos);

        /* vlan_tag of 0 means that the configuration should be cleared and in
         * such circumstances setting the TPID has no meaning when
         * configuring firmware.
         */
        if (vlan_tag && is_proto_sup)
                vlan_tag |= FIELD_PREP(NFP_NET_VF_CFG_VLAN_PROT, ntohs(vlan_proto));

        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
        writel(vlan_tag, app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_VLAN);

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

int nfp_app_set_vf_rate(struct net_device *netdev, int vf,
                        int min_tx_rate, int max_tx_rate)
{
        struct nfp_app *app = nfp_app_from_netdev(netdev);
        u32 vf_offset, ratevalue;
        int err;

        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_RATE, "rate", true);
        if (err)
                return err;

        if (max_tx_rate >= NFP_NET_VF_RATE_MAX ||
            min_tx_rate >= NFP_NET_VF_RATE_MAX) {
                nfp_warn(app->cpp, "tx-rate exceeds %d.\n",
                         NFP_NET_VF_RATE_MAX);
                return -EINVAL;
        }

        vf_offset = NFP_NET_VF_CFG_MB_SZ + vf * NFP_NET_VF_CFG_SZ;
        ratevalue = FIELD_PREP(NFP_NET_VF_CFG_MAX_RATE,
                               max_tx_rate ? max_tx_rate :
                               NFP_NET_VF_RATE_MAX) |
                    FIELD_PREP(NFP_NET_VF_CFG_MIN_RATE, min_tx_rate);

        writel(ratevalue,
               app->pf->vfcfg_tbl2 + vf_offset + NFP_NET_VF_CFG_RATE);

        return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_RATE,
                                    "rate");
}

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", true);
        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_trust(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_TRUST,
                                  "trust", true);
        if (err)
                return err;

        /* Write trust 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_TRUST;
        vf_ctrl |= FIELD_PREP(NFP_NET_VF_CFG_CTRL_TRUST, enable);
        writeb(vf_ctrl, app->pf->vfcfg_tbl2 + vf_offset);

        return nfp_net_sriov_update(app, vf, NFP_NET_VF_CFG_MB_UPD_TRUST,
                                    "trust");
}

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", true);
        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);
        u32 vf_offset, mac_hi, rate;
        u32 vlan_tag;
        u16 mac_lo;
        u8 flags;
        int err;

        err = nfp_net_sriov_check(app, vf, 0, "", true);
        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_tag = readl(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_tag);
        ivi->qos = FIELD_GET(NFP_NET_VF_CFG_VLAN_QOS, vlan_tag);
        if (!nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_VLAN_PROTO, "vlan_proto", false))
                ivi->vlan_proto = htons(FIELD_GET(NFP_NET_VF_CFG_VLAN_PROT, vlan_tag));
        ivi->spoofchk = FIELD_GET(NFP_NET_VF_CFG_CTRL_SPOOF, flags);
        ivi->trusted = FIELD_GET(NFP_NET_VF_CFG_CTRL_TRUST, flags);
        ivi->linkstate = FIELD_GET(NFP_NET_VF_CFG_CTRL_LINK_STATE, flags);

        err = nfp_net_sriov_check(app, vf, NFP_NET_VF_CFG_MB_CAP_RATE, "rate", false);
        if (!err) {
                rate = readl(app->pf->vfcfg_tbl2 + vf_offset +
                             NFP_NET_VF_CFG_RATE);

                ivi->max_tx_rate = FIELD_GET(NFP_NET_VF_CFG_MAX_RATE, rate);
                ivi->min_tx_rate = FIELD_GET(NFP_NET_VF_CFG_MIN_RATE, rate);

                if (ivi->max_tx_rate == NFP_NET_VF_RATE_MAX)
                        ivi->max_tx_rate = 0;
                if (ivi->min_tx_rate == NFP_NET_VF_RATE_MAX)
                        ivi->min_tx_rate = 0;
        }

        return 0;
}