// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Intel Corporation. */

#include "ice_dcb_lib.h"
#include "ice_dcb_nl.h"

/**
 * ice_dcb_get_ena_tc - return bitmap of enabled TCs
 * @dcbcfg: DCB config to evaluate for enabled TCs
 */
static u8 ice_dcb_get_ena_tc(struct ice_dcbx_cfg *dcbcfg)
{
        u8 i, num_tc, ena_tc = 1;

        num_tc = ice_dcb_get_num_tc(dcbcfg);

        for (i = 0; i < num_tc; i++)
                ena_tc |= BIT(i);

        return ena_tc;
}

/**
 * ice_is_pfc_causing_hung_q
 * @pf: pointer to PF structure
 * @txqueue: Tx queue which is supposedly hung queue
 *
 * find if PFC is causing the hung queue, if yes return true else false
 */
bool ice_is_pfc_causing_hung_q(struct ice_pf *pf, unsigned int txqueue)
{
        u8 num_tcs = 0, i, tc, up_mapped_tc, up_in_tc = 0;
        u64 ref_prio_xoff[ICE_MAX_UP];
        struct ice_vsi *vsi;
        u32 up2tc;

        vsi = ice_get_main_vsi(pf);
        if (!vsi)
                return false;

        ice_for_each_traffic_class(i)
                if (vsi->tc_cfg.ena_tc & BIT(i))
                        num_tcs++;

        /* first find out the TC to which the hung queue belongs to */
        for (tc = 0; tc < num_tcs - 1; tc++)
                if (ice_find_q_in_range(vsi->tc_cfg.tc_info[tc].qoffset,
                                        vsi->tc_cfg.tc_info[tc + 1].qoffset,
                                        txqueue))
                        break;

        /* Build a bit map of all UPs associated to the suspect hung queue TC,
         * so that we check for its counter increment.
         */
        up2tc = rd32(&pf->hw, PRTDCB_TUP2TC);
        for (i = 0; i < ICE_MAX_UP; i++) {
                up_mapped_tc = (up2tc >> (i * 3)) & 0x7;
                if (up_mapped_tc == tc)
                        up_in_tc |= BIT(i);
        }

        /* Now that we figured out that hung queue is PFC enabled, still the
         * Tx timeout can be legitimate. So to make sure Tx timeout is
         * absolutely caused by PFC storm, check if the counters are
         * incrementing.
         */
        for (i = 0; i < ICE_MAX_UP; i++)
                if (up_in_tc & BIT(i))
                        ref_prio_xoff[i] = pf->stats.priority_xoff_rx[i];

        ice_update_dcb_stats(pf);

        for (i = 0; i < ICE_MAX_UP; i++)
                if (up_in_tc & BIT(i))
                        if (pf->stats.priority_xoff_rx[i] > ref_prio_xoff[i])
                                return true;

        return false;
}

/**
 * ice_dcb_get_mode - gets the DCB mode
 * @port_info: pointer to port info structure
 * @host: if set it's HOST if not it's MANAGED
 */
static u8 ice_dcb_get_mode(struct ice_port_info *port_info, bool host)
{
        u8 mode;

        if (host)
                mode = DCB_CAP_DCBX_HOST;
        else
                mode = DCB_CAP_DCBX_LLD_MANAGED;

        if (port_info->qos_cfg.local_dcbx_cfg.dcbx_mode & ICE_DCBX_MODE_CEE)
                return mode | DCB_CAP_DCBX_VER_CEE;
        else
                return mode | DCB_CAP_DCBX_VER_IEEE;
}

/**
 * ice_dcb_get_num_tc - Get the number of TCs from DCBX config
 * @dcbcfg: config to retrieve number of TCs from
 */
u8 ice_dcb_get_num_tc(struct ice_dcbx_cfg *dcbcfg)
{
        bool tc_unused = false;
        u8 num_tc = 0;
        u8 ret = 0;
        int i;

        /* Scan the ETS Config Priority Table to find traffic classes
         * enabled and create a bitmask of enabled TCs
         */
        for (i = 0; i < CEE_DCBX_MAX_PRIO; i++)
                num_tc |= BIT(dcbcfg->etscfg.prio_table[i]);

        /* Scan bitmask for contiguous TCs starting with TC0 */
        for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
                if (num_tc & BIT(i)) {
                        if (!tc_unused) {
                                ret++;
                        } else {
                                pr_err("Non-contiguous TCs - Disabling DCB\n");
                                return 1;
                        }
                } else {
                        tc_unused = true;
                }
        }

        /* There is always at least 1 TC */
        if (!ret)
                ret = 1;

        return ret;
}

/**
 * ice_get_first_droptc - returns number of first droptc
 * @vsi: used to find the first droptc
 *
 * This function returns the value of first_droptc.
 * When DCB is enabled, first droptc information is derived from enabled_tc
 * and PFC enabled bits. otherwise this function returns 0 as there is one
 * TC without DCB (tc0)
 */
static u8 ice_get_first_droptc(struct ice_vsi *vsi)
{
        struct ice_dcbx_cfg *cfg = &vsi->port_info->qos_cfg.local_dcbx_cfg;
        struct device *dev = ice_pf_to_dev(vsi->back);
        u8 num_tc, ena_tc_map, pfc_ena_map;
        u8 i;

        num_tc = ice_dcb_get_num_tc(cfg);

        /* get bitmap of enabled TCs */
        ena_tc_map = ice_dcb_get_ena_tc(cfg);

        /* get bitmap of PFC enabled TCs */
        pfc_ena_map = cfg->pfc.pfcena;

        /* get first TC that is not PFC enabled */
        for (i = 0; i < num_tc; i++) {
                if ((ena_tc_map & BIT(i)) && (!(pfc_ena_map & BIT(i)))) {
                        dev_dbg(dev, "first drop tc = %d\n", i);
                        return i;
                }
        }

        dev_dbg(dev, "first drop tc = 0\n");
        return 0;
}

/**
 * ice_vsi_set_dcb_tc_cfg - Set VSI's TC based on DCB configuration
 * @vsi: pointer to the VSI instance
 */
void ice_vsi_set_dcb_tc_cfg(struct ice_vsi *vsi)
{
        struct ice_dcbx_cfg *cfg = &vsi->port_info->qos_cfg.local_dcbx_cfg;

        switch (vsi->type) {
        case ICE_VSI_PF:
                vsi->tc_cfg.ena_tc = ice_dcb_get_ena_tc(cfg);
                vsi->tc_cfg.numtc = ice_dcb_get_num_tc(cfg);
                break;
        case ICE_VSI_CHNL:
                vsi->tc_cfg.ena_tc = BIT(ice_get_first_droptc(vsi));
                vsi->tc_cfg.numtc = 1;
                break;
        case ICE_VSI_CTRL:
        case ICE_VSI_LB:
        default:
                vsi->tc_cfg.ena_tc = ICE_DFLT_TRAFFIC_CLASS;
                vsi->tc_cfg.numtc = 1;
        }
}

/**
 * ice_dcb_get_tc - Get the TC associated with the queue
 * @vsi: ptr to the VSI
 * @queue_index: queue number associated with VSI
 */
u8 ice_dcb_get_tc(struct ice_vsi *vsi, int queue_index)
{
        return vsi->tx_rings[queue_index]->dcb_tc;
}

/**
 * ice_vsi_cfg_dcb_rings - Update rings to reflect DCB TC
 * @vsi: VSI owner of rings being updated
 */
void ice_vsi_cfg_dcb_rings(struct ice_vsi *vsi)
{
        struct ice_tx_ring *tx_ring;
        struct ice_rx_ring *rx_ring;
        u16 qoffset, qcount;
        int i, n;

        if (!test_bit(ICE_FLAG_DCB_ENA, vsi->back->flags)) {
                /* Reset the TC information */
                ice_for_each_txq(vsi, i) {
                        tx_ring = vsi->tx_rings[i];
                        tx_ring->dcb_tc = 0;
                }
                ice_for_each_rxq(vsi, i) {
                        rx_ring = vsi->rx_rings[i];
                        rx_ring->dcb_tc = 0;
                }
                return;
        }

        ice_for_each_traffic_class(n) {
                if (!(vsi->tc_cfg.ena_tc & BIT(n)))
                        break;

                qoffset = vsi->tc_cfg.tc_info[n].qoffset;
                qcount = vsi->tc_cfg.tc_info[n].qcount_tx;
                for (i = qoffset; i < (qoffset + qcount); i++)
                        vsi->tx_rings[i]->dcb_tc = n;

                qcount = vsi->tc_cfg.tc_info[n].qcount_rx;
                for (i = qoffset; i < (qoffset + qcount); i++)
                        vsi->rx_rings[i]->dcb_tc = n;
        }
        /* applicable only if "all_enatc" is set, which will be set from
         * setup_tc method as part of configuring channels
         */
        if (vsi->all_enatc) {
                u8 first_droptc = ice_get_first_droptc(vsi);

                /* When DCB is configured, TC for ADQ queues (which are really
                 * PF queues) should be the first drop TC of the main VSI
                 */
                ice_for_each_chnl_tc(n) {
                        if (!(vsi->all_enatc & BIT(n)))
                                break;

                        qoffset = vsi->mqprio_qopt.qopt.offset[n];
                        qcount = vsi->mqprio_qopt.qopt.count[n];
                        for (i = qoffset; i < (qoffset + qcount); i++) {
                                vsi->tx_rings[i]->dcb_tc = first_droptc;
                                vsi->rx_rings[i]->dcb_tc = first_droptc;
                        }
                }
        }
}

/**
 * ice_dcb_ena_dis_vsi - disable certain VSIs for DCB config/reconfig
 * @pf: pointer to the PF instance
 * @ena: true to enable VSIs, false to disable
 * @locked: true if caller holds RTNL lock, false otherwise
 *
 * Before a new DCB configuration can be applied, VSIs of type PF, SWITCHDEV
 * and CHNL need to be brought down. Following completion of DCB configuration
 * the VSIs that were downed need to be brought up again. This helper function
 * does both.
 */
static void ice_dcb_ena_dis_vsi(struct ice_pf *pf, bool ena, bool locked)
{
        int i;

        ice_for_each_vsi(pf, i) {
                struct ice_vsi *vsi = pf->vsi[i];

                if (!vsi)
                        continue;

                switch (vsi->type) {
                case ICE_VSI_CHNL:
                case ICE_VSI_SWITCHDEV_CTRL:
                case ICE_VSI_PF:
                        if (ena)
                                ice_ena_vsi(vsi, locked);
                        else
                                ice_dis_vsi(vsi, locked);
                        break;
                default:
                        continue;
                }
        }
}

/**
 * ice_dcb_bwchk - check if ETS bandwidth input parameters are correct
 * @pf: pointer to the PF struct
 * @dcbcfg: pointer to DCB config structure
 */
int ice_dcb_bwchk(struct ice_pf *pf, struct ice_dcbx_cfg *dcbcfg)
{
        struct ice_dcb_ets_cfg *etscfg = &dcbcfg->etscfg;
        u8 num_tc, total_bw = 0;
        int i;

        /* returns number of contigous TCs and 1 TC for non-contigous TCs,
         * since at least 1 TC has to be configured
         */
        num_tc = ice_dcb_get_num_tc(dcbcfg);

        /* no bandwidth checks required if there's only one TC, so assign
         * all bandwidth to TC0 and return
         */
        if (num_tc == 1) {
                etscfg->tcbwtable[0] = ICE_TC_MAX_BW;
                return 0;
        }

        for (i = 0; i < num_tc; i++)
                total_bw += etscfg->tcbwtable[i];

        if (!total_bw) {
                etscfg->tcbwtable[0] = ICE_TC_MAX_BW;
        } else if (total_bw != ICE_TC_MAX_BW) {
                dev_err(ice_pf_to_dev(pf), "Invalid config, total bandwidth must equal 100\n");
                return -EINVAL;
        }

        return 0;
}

/**
 * ice_pf_dcb_cfg - Apply new DCB configuration
 * @pf: pointer to the PF struct
 * @new_cfg: DCBX config to apply
 * @locked: is the RTNL held
 */
int ice_pf_dcb_cfg(struct ice_pf *pf, struct ice_dcbx_cfg *new_cfg, bool locked)
{
        struct ice_aqc_port_ets_elem buf = { 0 };
        struct ice_dcbx_cfg *old_cfg, *curr_cfg;
        struct device *dev = ice_pf_to_dev(pf);
        int ret = ICE_DCB_NO_HW_CHG;
        struct iidc_event *event;
        struct ice_vsi *pf_vsi;

        curr_cfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;

        /* FW does not care if change happened */
        if (!pf->hw.port_info->qos_cfg.is_sw_lldp)
                ret = ICE_DCB_HW_CHG_RST;

        /* Enable DCB tagging only when more than one TC */
        if (ice_dcb_get_num_tc(new_cfg) > 1) {
                dev_dbg(dev, "DCB tagging enabled (num TC > 1)\n");
                set_bit(ICE_FLAG_DCB_ENA, pf->flags);
        } else {
                dev_dbg(dev, "DCB tagging disabled (num TC = 1)\n");
                clear_bit(ICE_FLAG_DCB_ENA, pf->flags);
        }

        if (!memcmp(new_cfg, curr_cfg, sizeof(*new_cfg))) {
                dev_dbg(dev, "No change in DCB config required\n");
                return ret;
        }

        if (ice_dcb_bwchk(pf, new_cfg))
                return -EINVAL;

        /* Store old config in case FW config fails */
        old_cfg = kmemdup(curr_cfg, sizeof(*old_cfg), GFP_KERNEL);
        if (!old_cfg)
                return -ENOMEM;

        dev_info(dev, "Commit DCB Configuration to the hardware\n");
        pf_vsi = ice_get_main_vsi(pf);
        if (!pf_vsi) {
                dev_dbg(dev, "PF VSI doesn't exist\n");
                ret = -EINVAL;
                goto free_cfg;
        }

        /* Notify AUX drivers about impending change to TCs */
        event = kzalloc(sizeof(*event), GFP_KERNEL);
        if (!event) {
                ret = -ENOMEM;
                goto free_cfg;
        }

        set_bit(IIDC_EVENT_BEFORE_TC_CHANGE, event->type);
        ice_send_event_to_aux(pf, event);
        kfree(event);

        /* avoid race conditions by holding the lock while disabling and
         * re-enabling the VSI
         */
        if (!locked)
                rtnl_lock();

        /* disable VSIs affected by DCB changes */
        ice_dcb_ena_dis_vsi(pf, false, true);

        memcpy(curr_cfg, new_cfg, sizeof(*curr_cfg));
        memcpy(&curr_cfg->etsrec, &curr_cfg->etscfg, sizeof(curr_cfg->etsrec));
        memcpy(&new_cfg->etsrec, &curr_cfg->etscfg, sizeof(curr_cfg->etsrec));

        /* Only send new config to HW if we are in SW LLDP mode. Otherwise,
         * the new config came from the HW in the first place.
         */
        if (pf->hw.port_info->qos_cfg.is_sw_lldp) {
                ret = ice_set_dcb_cfg(pf->hw.port_info);
                if (ret) {
                        dev_err(dev, "Set DCB Config failed\n");
                        /* Restore previous settings to local config */
                        memcpy(curr_cfg, old_cfg, sizeof(*curr_cfg));
                        goto out;
                }
        }

        ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
        if (ret) {
                dev_err(dev, "Query Port ETS failed\n");
                goto out;
        }

        ice_pf_dcb_recfg(pf);

out:
        /* enable previously downed VSIs */
        ice_dcb_ena_dis_vsi(pf, true, true);
        if (!locked)
                rtnl_unlock();
free_cfg:
        kfree(old_cfg);
        return ret;
}

/**
 * ice_cfg_etsrec_defaults - Set default ETS recommended DCB config
 * @pi: port information structure
 */
static void ice_cfg_etsrec_defaults(struct ice_port_info *pi)
{
        struct ice_dcbx_cfg *dcbcfg = &pi->qos_cfg.local_dcbx_cfg;
        u8 i;

        /* Ensure ETS recommended DCB configuration is not already set */
        if (dcbcfg->etsrec.maxtcs)
                return;

        /* In CEE mode, set the default to 1 TC */
        dcbcfg->etsrec.maxtcs = 1;
        for (i = 0; i < ICE_MAX_TRAFFIC_CLASS; i++) {
                dcbcfg->etsrec.tcbwtable[i] = i ? 0 : 100;
                dcbcfg->etsrec.tsatable[i] = i ? ICE_IEEE_TSA_STRICT :
                                                 ICE_IEEE_TSA_ETS;
        }
}

/**
 * ice_dcb_need_recfg - Check if DCB needs reconfig
 * @pf: board private structure
 * @old_cfg: current DCB config
 * @new_cfg: new DCB config
 */
static bool
ice_dcb_need_recfg(struct ice_pf *pf, struct ice_dcbx_cfg *old_cfg,
                   struct ice_dcbx_cfg *new_cfg)
{
        struct device *dev = ice_pf_to_dev(pf);
        bool need_reconfig = false;

        /* Check if ETS configuration has changed */
        if (memcmp(&new_cfg->etscfg, &old_cfg->etscfg,
                   sizeof(new_cfg->etscfg))) {
                /* If Priority Table has changed reconfig is needed */
                if (memcmp(&new_cfg->etscfg.prio_table,
                           &old_cfg->etscfg.prio_table,
                           sizeof(new_cfg->etscfg.prio_table))) {
                        need_reconfig = true;
                        dev_dbg(dev, "ETS UP2TC changed.\n");
                }

                if (memcmp(&new_cfg->etscfg.tcbwtable,
                           &old_cfg->etscfg.tcbwtable,
                           sizeof(new_cfg->etscfg.tcbwtable)))
                        dev_dbg(dev, "ETS TC BW Table changed.\n");

                if (memcmp(&new_cfg->etscfg.tsatable,
                           &old_cfg->etscfg.tsatable,
                           sizeof(new_cfg->etscfg.tsatable)))
                        dev_dbg(dev, "ETS TSA Table changed.\n");
        }

        /* Check if PFC configuration has changed */
        if (memcmp(&new_cfg->pfc, &old_cfg->pfc, sizeof(new_cfg->pfc))) {
                need_reconfig = true;
                dev_dbg(dev, "PFC config change detected.\n");
        }

        /* Check if APP Table has changed */
        if (memcmp(&new_cfg->app, &old_cfg->app, sizeof(new_cfg->app))) {
                need_reconfig = true;
                dev_dbg(dev, "APP Table change detected.\n");
        }

        dev_dbg(dev, "dcb need_reconfig=%d\n", need_reconfig);
        return need_reconfig;
}

/**
 * ice_dcb_rebuild - rebuild DCB post reset
 * @pf: physical function instance
 */
void ice_dcb_rebuild(struct ice_pf *pf)
{
        struct ice_aqc_port_ets_elem buf = { 0 };
        struct device *dev = ice_pf_to_dev(pf);
        struct ice_dcbx_cfg *err_cfg;
        int ret;

        ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
        if (ret) {
                dev_err(dev, "Query Port ETS failed\n");
                goto dcb_error;
        }

        mutex_lock(&pf->tc_mutex);

        if (!pf->hw.port_info->qos_cfg.is_sw_lldp)
                ice_cfg_etsrec_defaults(pf->hw.port_info);

        ret = ice_set_dcb_cfg(pf->hw.port_info);
        if (ret) {
                dev_err(dev, "Failed to set DCB config in rebuild\n");
                goto dcb_error;
        }

        if (!pf->hw.port_info->qos_cfg.is_sw_lldp) {
                ret = ice_cfg_lldp_mib_change(&pf->hw, true);
                if (ret && !pf->hw.port_info->qos_cfg.is_sw_lldp) {
                        dev_err(dev, "Failed to register for MIB changes\n");
                        goto dcb_error;
                }
        }

        dev_info(dev, "DCB info restored\n");
        ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
        if (ret) {
                dev_err(dev, "Query Port ETS failed\n");
                goto dcb_error;
        }

        mutex_unlock(&pf->tc_mutex);

        return;

dcb_error:
        dev_err(dev, "Disabling DCB until new settings occur\n");
        err_cfg = kzalloc(sizeof(*err_cfg), GFP_KERNEL);
        if (!err_cfg) {
                mutex_unlock(&pf->tc_mutex);
                return;
        }

        err_cfg->etscfg.willing = true;
        err_cfg->etscfg.tcbwtable[0] = ICE_TC_MAX_BW;
        err_cfg->etscfg.tsatable[0] = ICE_IEEE_TSA_ETS;
        memcpy(&err_cfg->etsrec, &err_cfg->etscfg, sizeof(err_cfg->etsrec));
        /* Coverity warns the return code of ice_pf_dcb_cfg() is not checked
         * here as is done for other calls to that function. That check is
         * not necessary since this is in this function's error cleanup path.
         * Suppress the Coverity warning with the following comment...
         */
        /* coverity[check_return] */
        ice_pf_dcb_cfg(pf, err_cfg, false);
        kfree(err_cfg);

        mutex_unlock(&pf->tc_mutex);
}

/**
 * ice_dcb_init_cfg - set the initial DCB config in SW
 * @pf: PF to apply config to
 * @locked: Is the RTNL held
 */
static int ice_dcb_init_cfg(struct ice_pf *pf, bool locked)
{
        struct ice_dcbx_cfg *newcfg;
        struct ice_port_info *pi;
        int ret = 0;

        pi = pf->hw.port_info;
        newcfg = kmemdup(&pi->qos_cfg.local_dcbx_cfg, sizeof(*newcfg),
                         GFP_KERNEL);
        if (!newcfg)
                return -ENOMEM;

        memset(&pi->qos_cfg.local_dcbx_cfg, 0, sizeof(*newcfg));

        dev_info(ice_pf_to_dev(pf), "Configuring initial DCB values\n");
        if (ice_pf_dcb_cfg(pf, newcfg, locked))
                ret = -EINVAL;

        kfree(newcfg);

        return ret;
}

/**
 * ice_dcb_sw_dflt_cfg - Apply a default DCB config
 * @pf: PF to apply config to
 * @ets_willing: configure ETS willing
 * @locked: was this function called with RTNL held
 */
int ice_dcb_sw_dflt_cfg(struct ice_pf *pf, bool ets_willing, bool locked)
{
        struct ice_aqc_port_ets_elem buf = { 0 };
        struct ice_dcbx_cfg *dcbcfg;
        struct ice_port_info *pi;
        struct ice_hw *hw;
        int ret;

        hw = &pf->hw;
        pi = hw->port_info;
        dcbcfg = kzalloc(sizeof(*dcbcfg), GFP_KERNEL);
        if (!dcbcfg)
                return -ENOMEM;

        memset(&pi->qos_cfg.local_dcbx_cfg, 0, sizeof(*dcbcfg));

        dcbcfg->etscfg.willing = ets_willing ? 1 : 0;
        dcbcfg->etscfg.maxtcs = hw->func_caps.common_cap.maxtc;
        dcbcfg->etscfg.tcbwtable[0] = 100;
        dcbcfg->etscfg.tsatable[0] = ICE_IEEE_TSA_ETS;

        memcpy(&dcbcfg->etsrec, &dcbcfg->etscfg,
               sizeof(dcbcfg->etsrec));
        dcbcfg->etsrec.willing = 0;

        dcbcfg->pfc.willing = 1;
        dcbcfg->pfc.pfccap = hw->func_caps.common_cap.maxtc;

        dcbcfg->numapps = 1;
        dcbcfg->app[0].selector = ICE_APP_SEL_ETHTYPE;
        dcbcfg->app[0].priority = 3;
        dcbcfg->app[0].prot_id = ETH_P_FCOE;

        ret = ice_pf_dcb_cfg(pf, dcbcfg, locked);
        kfree(dcbcfg);
        if (ret)
                return ret;

        return ice_query_port_ets(pi, &buf, sizeof(buf), NULL);
}

/**
 * ice_dcb_tc_contig - Check that TCs are contiguous
 * @prio_table: pointer to priority table
 *
 * Check if TCs begin with TC0 and are contiguous
 */
static bool ice_dcb_tc_contig(u8 *prio_table)
{
        bool found_empty = false;
        u8 used_tc = 0;
        int i;

        /* Create a bitmap of used TCs */
        for (i = 0; i < CEE_DCBX_MAX_PRIO; i++)
                used_tc |= BIT(prio_table[i]);

        for (i = 0; i < CEE_DCBX_MAX_PRIO; i++) {
                if (used_tc & BIT(i)) {
                        if (found_empty)
                                return false;
                } else {
                        found_empty = true;
                }
        }

        return true;
}

/**
 * ice_dcb_noncontig_cfg - Configure DCB for non-contiguous TCs
 * @pf: pointer to the PF struct
 *
 * If non-contiguous TCs, then configure SW DCB with TC0 and ETS non-willing
 */
static int ice_dcb_noncontig_cfg(struct ice_pf *pf)
{
        struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
        struct device *dev = ice_pf_to_dev(pf);
        int ret;

        /* Configure SW DCB default with ETS non-willing */
        ret = ice_dcb_sw_dflt_cfg(pf, false, true);
        if (ret) {
                dev_err(dev, "Failed to set local DCB config %d\n", ret);
                return ret;
        }

        /* Reconfigure with ETS willing so that FW will send LLDP MIB event */
        dcbcfg->etscfg.willing = 1;
        ret = ice_set_dcb_cfg(pf->hw.port_info);
        if (ret)
                dev_err(dev, "Failed to set DCB to unwilling\n");

        return ret;
}

/**
 * ice_pf_dcb_recfg - Reconfigure all VEBs and VSIs
 * @pf: pointer to the PF struct
 *
 * Assumed caller has already disabled all VSIs before
 * calling this function. Reconfiguring DCB based on
 * local_dcbx_cfg.
 */
void ice_pf_dcb_recfg(struct ice_pf *pf)
{
        struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
        struct iidc_event *event;
        u8 tc_map = 0;
        int v, ret;

        /* Update each VSI */
        ice_for_each_vsi(pf, v) {
                struct ice_vsi *vsi = pf->vsi[v];

                if (!vsi)
                        continue;

                if (vsi->type == ICE_VSI_PF) {
                        tc_map = ice_dcb_get_ena_tc(dcbcfg);

                        /* If DCBX request non-contiguous TC, then configure
                         * default TC
                         */
                        if (!ice_dcb_tc_contig(dcbcfg->etscfg.prio_table)) {
                                tc_map = ICE_DFLT_TRAFFIC_CLASS;
                                ice_dcb_noncontig_cfg(pf);
                        }
                } else if (vsi->type == ICE_VSI_CHNL) {
                        tc_map = BIT(ice_get_first_droptc(vsi));
                } else {
                        tc_map = ICE_DFLT_TRAFFIC_CLASS;
                }

                ret = ice_vsi_cfg_tc(vsi, tc_map);
                if (ret) {
                        dev_err(ice_pf_to_dev(pf), "Failed to config TC for VSI index: %d\n",
                                vsi->idx);
                        continue;
                }
                /* no need to proceed with remaining cfg if it is CHNL
                 * or switchdev VSI
                 */
                if (vsi->type == ICE_VSI_CHNL ||
                    vsi->type == ICE_VSI_SWITCHDEV_CTRL)
                        continue;

                ice_vsi_map_rings_to_vectors(vsi);
                if (vsi->type == ICE_VSI_PF)
                        ice_dcbnl_set_all(vsi);
        }
        /* Notify the AUX drivers that TC change is finished */
        event = kzalloc(sizeof(*event), GFP_KERNEL);
        if (!event)
                return;

        set_bit(IIDC_EVENT_AFTER_TC_CHANGE, event->type);
        ice_send_event_to_aux(pf, event);
        kfree(event);
}

/**
 * ice_init_pf_dcb - initialize DCB for a PF
 * @pf: PF to initialize DCB for
 * @locked: Was function called with RTNL held
 */
int ice_init_pf_dcb(struct ice_pf *pf, bool locked)
{
        struct device *dev = ice_pf_to_dev(pf);
        struct ice_port_info *port_info;
        struct ice_hw *hw = &pf->hw;
        int err;

        port_info = hw->port_info;

        err = ice_init_dcb(hw, false);
        if (err && !port_info->qos_cfg.is_sw_lldp) {
                dev_err(dev, "Error initializing DCB %d\n", err);
                goto dcb_init_err;
        }

        dev_info(dev, "DCB is enabled in the hardware, max number of TCs supported on this port are %d\n",
                 pf->hw.func_caps.common_cap.maxtc);
        if (err) {
                struct ice_vsi *pf_vsi;

                /* FW LLDP is disabled, activate SW DCBX/LLDP mode */
                dev_info(dev, "FW LLDP is disabled, DCBx/LLDP in SW mode.\n");
                clear_bit(ICE_FLAG_FW_LLDP_AGENT, pf->flags);
                err = ice_aq_set_pfc_mode(&pf->hw, ICE_AQC_PFC_VLAN_BASED_PFC,
                                          NULL);
                if (err)
                        dev_info(dev, "Failed to set VLAN PFC mode\n");

                err = ice_dcb_sw_dflt_cfg(pf, true, locked);
                if (err) {
                        dev_err(dev, "Failed to set local DCB config %d\n",
                                err);
                        err = -EIO;
                        goto dcb_init_err;
                }

                /* If the FW DCBX engine is not running then Rx LLDP packets
                 * need to be redirected up the stack.
                 */
                pf_vsi = ice_get_main_vsi(pf);
                if (!pf_vsi) {
                        dev_err(dev, "Failed to set local DCB config\n");
                        err = -EIO;
                        goto dcb_init_err;
                }

                ice_cfg_sw_lldp(pf_vsi, false, true);

                pf->dcbx_cap = ice_dcb_get_mode(port_info, true);
                return 0;
        }

        set_bit(ICE_FLAG_FW_LLDP_AGENT, pf->flags);

        /* DCBX/LLDP enabled in FW, set DCBNL mode advertisement */
        pf->dcbx_cap = ice_dcb_get_mode(port_info, false);

        err = ice_dcb_init_cfg(pf, locked);
        if (err)
                goto dcb_init_err;

        return err;

dcb_init_err:
        dev_err(dev, "DCB init failed\n");
        return err;
}

/**
 * ice_update_dcb_stats - Update DCB stats counters
 * @pf: PF whose stats needs to be updated
 */
void ice_update_dcb_stats(struct ice_pf *pf)
{
        struct ice_hw_port_stats *prev_ps, *cur_ps;
        struct ice_hw *hw = &pf->hw;
        u8 port;
        int i;

        port = hw->port_info->lport;
        prev_ps = &pf->stats_prev;
        cur_ps = &pf->stats;

        for (i = 0; i < 8; i++) {
                ice_stat_update32(hw, GLPRT_PXOFFRXC(port, i),
                                  pf->stat_prev_loaded,
                                  &prev_ps->priority_xoff_rx[i],
                                  &cur_ps->priority_xoff_rx[i]);
                ice_stat_update32(hw, GLPRT_PXONRXC(port, i),
                                  pf->stat_prev_loaded,
                                  &prev_ps->priority_xon_rx[i],
                                  &cur_ps->priority_xon_rx[i]);
                ice_stat_update32(hw, GLPRT_PXONTXC(port, i),
                                  pf->stat_prev_loaded,
                                  &prev_ps->priority_xon_tx[i],
                                  &cur_ps->priority_xon_tx[i]);
                ice_stat_update32(hw, GLPRT_PXOFFTXC(port, i),
                                  pf->stat_prev_loaded,
                                  &prev_ps->priority_xoff_tx[i],
                                  &cur_ps->priority_xoff_tx[i]);
                ice_stat_update32(hw, GLPRT_RXON2OFFCNT(port, i),
                                  pf->stat_prev_loaded,
                                  &prev_ps->priority_xon_2_xoff[i],
                                  &cur_ps->priority_xon_2_xoff[i]);
        }
}

/**
 * ice_tx_prepare_vlan_flags_dcb - prepare VLAN tagging for DCB
 * @tx_ring: ring to send buffer on
 * @first: pointer to struct ice_tx_buf
 *
 * This should not be called if the outer VLAN is software offloaded as the VLAN
 * tag will already be configured with the correct ID and priority bits
 */
void
ice_tx_prepare_vlan_flags_dcb(struct ice_tx_ring *tx_ring,
                              struct ice_tx_buf *first)
{
        struct sk_buff *skb = first->skb;

        if (!test_bit(ICE_FLAG_DCB_ENA, tx_ring->vsi->back->flags))
                return;

        /* Insert 802.1p priority into VLAN header */
        if ((first->tx_flags & ICE_TX_FLAGS_HW_VLAN ||
             first->tx_flags & ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN) ||
            skb->priority != TC_PRIO_CONTROL) {
                first->tx_flags &= ~ICE_TX_FLAGS_VLAN_PR_M;
                /* Mask the lower 3 bits to set the 802.1p priority */
                first->tx_flags |= (skb->priority & 0x7) <<
                                   ICE_TX_FLAGS_VLAN_PR_S;
                /* if this is not already set it means a VLAN 0 + priority needs
                 * to be offloaded
                 */
                if (tx_ring->flags & ICE_TX_FLAGS_RING_VLAN_L2TAG2)
                        first->tx_flags |= ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN;
                else
                        first->tx_flags |= ICE_TX_FLAGS_HW_VLAN;
        }
}

/**
 * ice_dcb_process_lldp_set_mib_change - Process MIB change
 * @pf: ptr to ice_pf
 * @event: pointer to the admin queue receive event
 */
void
ice_dcb_process_lldp_set_mib_change(struct ice_pf *pf,
                                    struct ice_rq_event_info *event)
{
        struct ice_aqc_port_ets_elem buf = { 0 };
        struct device *dev = ice_pf_to_dev(pf);
        struct ice_aqc_lldp_get_mib *mib;
        struct ice_dcbx_cfg tmp_dcbx_cfg;
        bool need_reconfig = false;
        struct ice_port_info *pi;
        u8 mib_type;
        int ret;

        /* Not DCB capable or capability disabled */
        if (!(test_bit(ICE_FLAG_DCB_CAPABLE, pf->flags)))
                return;

        if (pf->dcbx_cap & DCB_CAP_DCBX_HOST) {
                dev_dbg(dev, "MIB Change Event in HOST mode\n");
                return;
        }

        pi = pf->hw.port_info;
        mib = (struct ice_aqc_lldp_get_mib *)&event->desc.params.raw;
        /* Ignore if event is not for Nearest Bridge */
        mib_type = ((mib->type >> ICE_AQ_LLDP_BRID_TYPE_S) &
                    ICE_AQ_LLDP_BRID_TYPE_M);
        dev_dbg(dev, "LLDP event MIB bridge type 0x%x\n", mib_type);
        if (mib_type != ICE_AQ_LLDP_BRID_TYPE_NEAREST_BRID)
                return;

        /* Check MIB Type and return if event for Remote MIB update */
        mib_type = mib->type & ICE_AQ_LLDP_MIB_TYPE_M;
        dev_dbg(dev, "LLDP event mib type %s\n", mib_type ? "remote" : "local");
        if (mib_type == ICE_AQ_LLDP_MIB_REMOTE) {
                /* Update the remote cached instance and return */
                ret = ice_aq_get_dcb_cfg(pi->hw, ICE_AQ_LLDP_MIB_REMOTE,
                                         ICE_AQ_LLDP_BRID_TYPE_NEAREST_BRID,
                                         &pi->qos_cfg.remote_dcbx_cfg);
                if (ret) {
                        dev_err(dev, "Failed to get remote DCB config\n");
                        return;
                }
        }

        mutex_lock(&pf->tc_mutex);

        /* store the old configuration */
        tmp_dcbx_cfg = pf->hw.port_info->qos_cfg.local_dcbx_cfg;

        /* Reset the old DCBX configuration data */
        memset(&pi->qos_cfg.local_dcbx_cfg, 0,
               sizeof(pi->qos_cfg.local_dcbx_cfg));

        /* Get updated DCBX data from firmware */
        ret = ice_get_dcb_cfg(pf->hw.port_info);
        if (ret) {
                dev_err(dev, "Failed to get DCB config\n");
                goto out;
        }

        /* No change detected in DCBX configs */
        if (!memcmp(&tmp_dcbx_cfg, &pi->qos_cfg.local_dcbx_cfg,
                    sizeof(tmp_dcbx_cfg))) {
                dev_dbg(dev, "No change detected in DCBX configuration.\n");
                goto out;
        }

        pf->dcbx_cap = ice_dcb_get_mode(pi, false);

        need_reconfig = ice_dcb_need_recfg(pf, &tmp_dcbx_cfg,
                                           &pi->qos_cfg.local_dcbx_cfg);
        ice_dcbnl_flush_apps(pf, &tmp_dcbx_cfg, &pi->qos_cfg.local_dcbx_cfg);
        if (!need_reconfig)
                goto out;

        /* Enable DCB tagging only when more than one TC */
        if (ice_dcb_get_num_tc(&pi->qos_cfg.local_dcbx_cfg) > 1) {
                dev_dbg(dev, "DCB tagging enabled (num TC > 1)\n");
                set_bit(ICE_FLAG_DCB_ENA, pf->flags);
        } else {
                dev_dbg(dev, "DCB tagging disabled (num TC = 1)\n");
                clear_bit(ICE_FLAG_DCB_ENA, pf->flags);
        }

        rtnl_lock();
        /* disable VSIs affected by DCB changes */
        ice_dcb_ena_dis_vsi(pf, false, true);

        ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
        if (ret) {
                dev_err(dev, "Query Port ETS failed\n");
                goto unlock_rtnl;
        }

        /* changes in configuration update VSI */
        ice_pf_dcb_recfg(pf);

        /* enable previously downed VSIs */
        ice_dcb_ena_dis_vsi(pf, true, true);
unlock_rtnl:
        rtnl_unlock();
out:
        mutex_unlock(&pf->tc_mutex);
}