/*
 * Copyright (c) 2012 Intel Corporation.  All rights reserved.
 * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - 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 <rdma/ib_smi.h>

#include "qib.h"
#include "qib_mad.h"

static int reply(struct ib_smp *smp)
{
        /*
         * The verbs framework will handle the directed/LID route
         * packet changes.
         */
        smp->method = IB_MGMT_METHOD_GET_RESP;
        if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
                smp->status |= IB_SMP_DIRECTION;
        return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}

static int reply_failure(struct ib_smp *smp)
{
        /*
         * The verbs framework will handle the directed/LID route
         * packet changes.
         */
        smp->method = IB_MGMT_METHOD_GET_RESP;
        if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
                smp->status |= IB_SMP_DIRECTION;
        return IB_MAD_RESULT_FAILURE | IB_MAD_RESULT_REPLY;
}

static void qib_send_trap(struct qib_ibport *ibp, void *data, unsigned len)
{
        struct ib_mad_send_buf *send_buf;
        struct ib_mad_agent *agent;
        struct ib_smp *smp;
        int ret;
        unsigned long flags;
        unsigned long timeout;

        agent = ibp->rvp.send_agent;
        if (!agent)
                return;

        /* o14-3.2.1 */
        if (!(ppd_from_ibp(ibp)->lflags & QIBL_LINKACTIVE))
                return;

        /* o14-2 */
        if (ibp->rvp.trap_timeout &&
            time_before(jiffies, ibp->rvp.trap_timeout))
                return;

        send_buf = ib_create_send_mad(agent, 0, 0, 0, IB_MGMT_MAD_HDR,
                                      IB_MGMT_MAD_DATA, GFP_ATOMIC,
                                      IB_MGMT_BASE_VERSION);
        if (IS_ERR(send_buf))
                return;

        smp = send_buf->mad;
        smp->base_version = IB_MGMT_BASE_VERSION;
        smp->mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
        smp->class_version = 1;
        smp->method = IB_MGMT_METHOD_TRAP;
        ibp->rvp.tid++;
        smp->tid = cpu_to_be64(ibp->rvp.tid);
        smp->attr_id = IB_SMP_ATTR_NOTICE;
        /* o14-1: smp->mkey = 0; */
        memcpy(smp->data, data, len);

        spin_lock_irqsave(&ibp->rvp.lock, flags);
        if (!ibp->rvp.sm_ah) {
                if (ibp->rvp.sm_lid != be16_to_cpu(IB_LID_PERMISSIVE)) {
                        struct ib_ah *ah;

                        ah = qib_create_qp0_ah(ibp, (u16)ibp->rvp.sm_lid);
                        if (IS_ERR(ah))
                                ret = PTR_ERR(ah);
                        else {
                                send_buf->ah = ah;
                                ibp->rvp.sm_ah = ibah_to_rvtah(ah);
                                ret = 0;
                        }
                } else
                        ret = -EINVAL;
        } else {
                send_buf->ah = &ibp->rvp.sm_ah->ibah;
                ret = 0;
        }
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        if (!ret)
                ret = ib_post_send_mad(send_buf, NULL);
        if (!ret) {
                /* 4.096 usec. */
                timeout = (4096 * (1UL << ibp->rvp.subnet_timeout)) / 1000;
                ibp->rvp.trap_timeout = jiffies + usecs_to_jiffies(timeout);
        } else {
                ib_free_send_mad(send_buf);
                ibp->rvp.trap_timeout = 0;
        }
}

/*
 * Send a bad P_Key trap (ch. 14.3.8).
 */
void qib_bad_pkey(struct qib_ibport *ibp, u32 key, u32 sl,
                  u32 qp1, u32 qp2, __be16 lid1, __be16 lid2)
{
        struct ib_mad_notice_attr data;

        ibp->rvp.n_pkt_drops++;
        ibp->rvp.pkey_violations++;

        /* Send violation trap */
        data.generic_type = IB_NOTICE_TYPE_SECURITY;
        data.prod_type_msb = 0;
        data.prod_type_lsb = IB_NOTICE_PROD_CA;
        data.trap_num = IB_NOTICE_TRAP_BAD_PKEY;
        data.issuer_lid = cpu_to_be16(ppd_from_ibp(ibp)->lid);
        data.toggle_count = 0;
        memset(&data.details, 0, sizeof(data.details));
        data.details.ntc_257_258.lid1 = lid1;
        data.details.ntc_257_258.lid2 = lid2;
        data.details.ntc_257_258.key = cpu_to_be32(key);
        data.details.ntc_257_258.sl_qp1 = cpu_to_be32((sl << 28) | qp1);
        data.details.ntc_257_258.qp2 = cpu_to_be32(qp2);

        qib_send_trap(ibp, &data, sizeof(data));
}

/*
 * Send a bad M_Key trap (ch. 14.3.9).
 */
static void qib_bad_mkey(struct qib_ibport *ibp, struct ib_smp *smp)
{
        struct ib_mad_notice_attr data;

        /* Send violation trap */
        data.generic_type = IB_NOTICE_TYPE_SECURITY;
        data.prod_type_msb = 0;
        data.prod_type_lsb = IB_NOTICE_PROD_CA;
        data.trap_num = IB_NOTICE_TRAP_BAD_MKEY;
        data.issuer_lid = cpu_to_be16(ppd_from_ibp(ibp)->lid);
        data.toggle_count = 0;
        memset(&data.details, 0, sizeof(data.details));
        data.details.ntc_256.lid = data.issuer_lid;
        data.details.ntc_256.method = smp->method;
        data.details.ntc_256.attr_id = smp->attr_id;
        data.details.ntc_256.attr_mod = smp->attr_mod;
        data.details.ntc_256.mkey = smp->mkey;
        if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
                u8 hop_cnt;

                data.details.ntc_256.dr_slid = smp->dr_slid;
                data.details.ntc_256.dr_trunc_hop = IB_NOTICE_TRAP_DR_NOTICE;
                hop_cnt = smp->hop_cnt;
                if (hop_cnt > ARRAY_SIZE(data.details.ntc_256.dr_rtn_path)) {
                        data.details.ntc_256.dr_trunc_hop |=
                                IB_NOTICE_TRAP_DR_TRUNC;
                        hop_cnt = ARRAY_SIZE(data.details.ntc_256.dr_rtn_path);
                }
                data.details.ntc_256.dr_trunc_hop |= hop_cnt;
                memcpy(data.details.ntc_256.dr_rtn_path, smp->return_path,
                       hop_cnt);
        }

        qib_send_trap(ibp, &data, sizeof(data));
}

/*
 * Send a Port Capability Mask Changed trap (ch. 14.3.11).
 */
void qib_cap_mask_chg(struct rvt_dev_info *rdi, u32 port_num)
{
        struct qib_ibdev *ibdev = container_of(rdi, struct qib_ibdev, rdi);
        struct qib_devdata *dd = dd_from_dev(ibdev);
        struct qib_ibport *ibp = &dd->pport[port_num - 1].ibport_data;
        struct ib_mad_notice_attr data;

        data.generic_type = IB_NOTICE_TYPE_INFO;
        data.prod_type_msb = 0;
        data.prod_type_lsb = IB_NOTICE_PROD_CA;
        data.trap_num = IB_NOTICE_TRAP_CAP_MASK_CHG;
        data.issuer_lid = cpu_to_be16(ppd_from_ibp(ibp)->lid);
        data.toggle_count = 0;
        memset(&data.details, 0, sizeof(data.details));
        data.details.ntc_144.lid = data.issuer_lid;
        data.details.ntc_144.new_cap_mask =
                                        cpu_to_be32(ibp->rvp.port_cap_flags);
        qib_send_trap(ibp, &data, sizeof(data));
}

/*
 * Send a System Image GUID Changed trap (ch. 14.3.12).
 */
void qib_sys_guid_chg(struct qib_ibport *ibp)
{
        struct ib_mad_notice_attr data;

        data.generic_type = IB_NOTICE_TYPE_INFO;
        data.prod_type_msb = 0;
        data.prod_type_lsb = IB_NOTICE_PROD_CA;
        data.trap_num = IB_NOTICE_TRAP_SYS_GUID_CHG;
        data.issuer_lid = cpu_to_be16(ppd_from_ibp(ibp)->lid);
        data.toggle_count = 0;
        memset(&data.details, 0, sizeof(data.details));
        data.details.ntc_145.lid = data.issuer_lid;
        data.details.ntc_145.new_sys_guid = ib_qib_sys_image_guid;

        qib_send_trap(ibp, &data, sizeof(data));
}

/*
 * Send a Node Description Changed trap (ch. 14.3.13).
 */
void qib_node_desc_chg(struct qib_ibport *ibp)
{
        struct ib_mad_notice_attr data;

        data.generic_type = IB_NOTICE_TYPE_INFO;
        data.prod_type_msb = 0;
        data.prod_type_lsb = IB_NOTICE_PROD_CA;
        data.trap_num = IB_NOTICE_TRAP_CAP_MASK_CHG;
        data.issuer_lid = cpu_to_be16(ppd_from_ibp(ibp)->lid);
        data.toggle_count = 0;
        memset(&data.details, 0, sizeof(data.details));
        data.details.ntc_144.lid = data.issuer_lid;
        data.details.ntc_144.local_changes = 1;
        data.details.ntc_144.change_flags = IB_NOTICE_TRAP_NODE_DESC_CHG;

        qib_send_trap(ibp, &data, sizeof(data));
}

static int subn_get_nodedescription(struct ib_smp *smp,
                                    struct ib_device *ibdev)
{
        if (smp->attr_mod)
                smp->status |= IB_SMP_INVALID_FIELD;

        memcpy(smp->data, ibdev->node_desc, sizeof(smp->data));

        return reply(smp);
}

static int subn_get_nodeinfo(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct ib_node_info *nip = (struct ib_node_info *)&smp->data;
        struct qib_devdata *dd = dd_from_ibdev(ibdev);
        u32 majrev, minrev;
        unsigned pidx = port - 1; /* IB number port from 1, hdw from 0 */

        /* GUID 0 is illegal */
        if (smp->attr_mod || pidx >= dd->num_pports ||
            dd->pport[pidx].guid == 0)
                smp->status |= IB_SMP_INVALID_FIELD;
        else
                nip->port_guid = dd->pport[pidx].guid;

        nip->base_version = 1;
        nip->class_version = 1;
        nip->node_type = 1;     /* channel adapter */
        nip->num_ports = ibdev->phys_port_cnt;
        /* This is already in network order */
        nip->sys_guid = ib_qib_sys_image_guid;
        nip->node_guid = dd->pport->guid; /* Use first-port GUID as node */
        nip->partition_cap = cpu_to_be16(qib_get_npkeys(dd));
        nip->device_id = cpu_to_be16(dd->deviceid);
        majrev = dd->majrev;
        minrev = dd->minrev;
        nip->revision = cpu_to_be32((majrev << 16) | minrev);
        nip->local_port_num = port;
        nip->vendor_id[0] = QIB_SRC_OUI_1;
        nip->vendor_id[1] = QIB_SRC_OUI_2;
        nip->vendor_id[2] = QIB_SRC_OUI_3;

        return reply(smp);
}

static int subn_get_guidinfo(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct qib_devdata *dd = dd_from_ibdev(ibdev);
        u32 startgx = 8 * be32_to_cpu(smp->attr_mod);
        __be64 *p = (__be64 *) smp->data;
        unsigned pidx = port - 1; /* IB number port from 1, hdw from 0 */

        /* 32 blocks of 8 64-bit GUIDs per block */

        memset(smp->data, 0, sizeof(smp->data));

        if (startgx == 0 && pidx < dd->num_pports) {
                struct qib_pportdata *ppd = dd->pport + pidx;
                struct qib_ibport *ibp = &ppd->ibport_data;
                __be64 g = ppd->guid;
                unsigned i;

                /* GUID 0 is illegal */
                if (g == 0)
                        smp->status |= IB_SMP_INVALID_FIELD;
                else {
                        /* The first is a copy of the read-only HW GUID. */
                        p[0] = g;
                        for (i = 1; i < QIB_GUIDS_PER_PORT; i++)
                                p[i] = ibp->guids[i - 1];
                }
        } else
                smp->status |= IB_SMP_INVALID_FIELD;

        return reply(smp);
}

static void set_link_width_enabled(struct qib_pportdata *ppd, u32 w)
{
        (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LWID_ENB, w);
}

static void set_link_speed_enabled(struct qib_pportdata *ppd, u32 s)
{
        (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_SPD_ENB, s);
}

static int get_overrunthreshold(struct qib_pportdata *ppd)
{
        return ppd->dd->f_get_ib_cfg(ppd, QIB_IB_CFG_OVERRUN_THRESH);
}

/**
 * set_overrunthreshold - set the overrun threshold
 * @ppd: the physical port data
 * @n: the new threshold
 *
 * Note that this will only take effect when the link state changes.
 */
static int set_overrunthreshold(struct qib_pportdata *ppd, unsigned n)
{
        (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_OVERRUN_THRESH,
                                         (u32)n);
        return 0;
}

static int get_phyerrthreshold(struct qib_pportdata *ppd)
{
        return ppd->dd->f_get_ib_cfg(ppd, QIB_IB_CFG_PHYERR_THRESH);
}

/**
 * set_phyerrthreshold - set the physical error threshold
 * @ppd: the physical port data
 * @n: the new threshold
 *
 * Note that this will only take effect when the link state changes.
 */
static int set_phyerrthreshold(struct qib_pportdata *ppd, unsigned n)
{
        (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PHYERR_THRESH,
                                         (u32)n);
        return 0;
}

/**
 * get_linkdowndefaultstate - get the default linkdown state
 * @ppd: the physical port data
 *
 * Returns zero if the default is POLL, 1 if the default is SLEEP.
 */
static int get_linkdowndefaultstate(struct qib_pportdata *ppd)
{
        return ppd->dd->f_get_ib_cfg(ppd, QIB_IB_CFG_LINKDEFAULT) ==
                IB_LINKINITCMD_SLEEP;
}

static int check_mkey(struct qib_ibport *ibp, struct ib_smp *smp, int mad_flags)
{
        int valid_mkey = 0;
        int ret = 0;

        /* Is the mkey in the process of expiring? */
        if (ibp->rvp.mkey_lease_timeout &&
            time_after_eq(jiffies, ibp->rvp.mkey_lease_timeout)) {
                /* Clear timeout and mkey protection field. */
                ibp->rvp.mkey_lease_timeout = 0;
                ibp->rvp.mkeyprot = 0;
        }

        if ((mad_flags & IB_MAD_IGNORE_MKEY) ||  ibp->rvp.mkey == 0 ||
            ibp->rvp.mkey == smp->mkey)
                valid_mkey = 1;

        /* Unset lease timeout on any valid Get/Set/TrapRepress */
        if (valid_mkey && ibp->rvp.mkey_lease_timeout &&
            (smp->method == IB_MGMT_METHOD_GET ||
             smp->method == IB_MGMT_METHOD_SET ||
             smp->method == IB_MGMT_METHOD_TRAP_REPRESS))
                ibp->rvp.mkey_lease_timeout = 0;

        if (!valid_mkey) {
                switch (smp->method) {
                case IB_MGMT_METHOD_GET:
                        /* Bad mkey not a violation below level 2 */
                        if (ibp->rvp.mkeyprot < 2)
                                break;
                        fallthrough;
                case IB_MGMT_METHOD_SET:
                case IB_MGMT_METHOD_TRAP_REPRESS:
                        if (ibp->rvp.mkey_violations != 0xFFFF)
                                ++ibp->rvp.mkey_violations;
                        if (!ibp->rvp.mkey_lease_timeout &&
                            ibp->rvp.mkey_lease_period)
                                ibp->rvp.mkey_lease_timeout = jiffies +
                                        ibp->rvp.mkey_lease_period * HZ;
                        /* Generate a trap notice. */
                        qib_bad_mkey(ibp, smp);
                        ret = 1;
                }
        }

        return ret;
}

static int subn_get_portinfo(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct qib_devdata *dd;
        struct qib_pportdata *ppd;
        struct qib_ibport *ibp;
        struct ib_port_info *pip = (struct ib_port_info *)smp->data;
        u8 mtu;
        int ret;
        u32 state;
        u32 port_num = be32_to_cpu(smp->attr_mod);

        if (port_num == 0)
                port_num = port;
        else {
                if (port_num > ibdev->phys_port_cnt) {
                        smp->status |= IB_SMP_INVALID_FIELD;
                        ret = reply(smp);
                        goto bail;
                }
                if (port_num != port) {
                        ibp = to_iport(ibdev, port_num);
                        ret = check_mkey(ibp, smp, 0);
                        if (ret) {
                                ret = IB_MAD_RESULT_FAILURE;
                                goto bail;
                        }
                }
        }

        dd = dd_from_ibdev(ibdev);
        /* IB numbers ports from 1, hdw from 0 */
        ppd = dd->pport + (port_num - 1);
        ibp = &ppd->ibport_data;

        /* Clear all fields.  Only set the non-zero fields. */
        memset(smp->data, 0, sizeof(smp->data));

        /* Only return the mkey if the protection field allows it. */
        if (!(smp->method == IB_MGMT_METHOD_GET &&
              ibp->rvp.mkey != smp->mkey &&
              ibp->rvp.mkeyprot == 1))
                pip->mkey = ibp->rvp.mkey;
        pip->gid_prefix = ibp->rvp.gid_prefix;
        pip->lid = cpu_to_be16(ppd->lid);
        pip->sm_lid = cpu_to_be16((u16)ibp->rvp.sm_lid);
        pip->cap_mask = cpu_to_be32(ibp->rvp.port_cap_flags);
        /* pip->diag_code; */
        pip->mkey_lease_period = cpu_to_be16(ibp->rvp.mkey_lease_period);
        pip->local_port_num = port;
        pip->link_width_enabled = ppd->link_width_enabled;
        pip->link_width_supported = ppd->link_width_supported;
        pip->link_width_active = ppd->link_width_active;
        state = dd->f_iblink_state(ppd->lastibcstat);
        pip->linkspeed_portstate = ppd->link_speed_supported << 4 | state;

        pip->portphysstate_linkdown =
                (dd->f_ibphys_portstate(ppd->lastibcstat) << 4) |
                (get_linkdowndefaultstate(ppd) ? 1 : 2);
        pip->mkeyprot_resv_lmc = (ibp->rvp.mkeyprot << 6) | ppd->lmc;
        pip->linkspeedactive_enabled = (ppd->link_speed_active << 4) |
                ppd->link_speed_enabled;
        switch (ppd->ibmtu) {
        default: /* something is wrong; fall through */
        case 4096:
                mtu = IB_MTU_4096;
                break;
        case 2048:
                mtu = IB_MTU_2048;
                break;
        case 1024:
                mtu = IB_MTU_1024;
                break;
        case 512:
                mtu = IB_MTU_512;
                break;
        case 256:
                mtu = IB_MTU_256;
                break;
        }
        pip->neighbormtu_mastersmsl = (mtu << 4) | ibp->rvp.sm_sl;
        pip->vlcap_inittype = ppd->vls_supported << 4;  /* InitType = 0 */
        pip->vl_high_limit = ibp->rvp.vl_high_limit;
        pip->vl_arb_high_cap =
                dd->f_get_ib_cfg(ppd, QIB_IB_CFG_VL_HIGH_CAP);
        pip->vl_arb_low_cap =
                dd->f_get_ib_cfg(ppd, QIB_IB_CFG_VL_LOW_CAP);
        /* InitTypeReply = 0 */
        pip->inittypereply_mtucap = qib_ibmtu ? qib_ibmtu : IB_MTU_4096;
        /* HCAs ignore VLStallCount and HOQLife */
        /* pip->vlstallcnt_hoqlife; */
        pip->operationalvl_pei_peo_fpi_fpo =
                dd->f_get_ib_cfg(ppd, QIB_IB_CFG_OP_VLS) << 4;
        pip->mkey_violations = cpu_to_be16(ibp->rvp.mkey_violations);
        /* P_KeyViolations are counted by hardware. */
        pip->pkey_violations = cpu_to_be16(ibp->rvp.pkey_violations);
        pip->qkey_violations = cpu_to_be16(ibp->rvp.qkey_violations);
        /* Only the hardware GUID is supported for now */
        pip->guid_cap = QIB_GUIDS_PER_PORT;
        pip->clientrereg_resv_subnetto = ibp->rvp.subnet_timeout;
        /* 32.768 usec. response time (guessing) */
        pip->resv_resptimevalue = 3;
        pip->localphyerrors_overrunerrors =
                (get_phyerrthreshold(ppd) << 4) |
                get_overrunthreshold(ppd);
        /* pip->max_credit_hint; */
        if (ibp->rvp.port_cap_flags & IB_PORT_LINK_LATENCY_SUP) {
                u32 v;

                v = dd->f_get_ib_cfg(ppd, QIB_IB_CFG_LINKLATENCY);
                pip->link_roundtrip_latency[0] = v >> 16;
                pip->link_roundtrip_latency[1] = v >> 8;
                pip->link_roundtrip_latency[2] = v;
        }

        ret = reply(smp);

bail:
        return ret;
}

/**
 * get_pkeys - return the PKEY table
 * @dd: the qlogic_ib device
 * @port: the IB port number
 * @pkeys: the pkey table is placed here
 */
static int get_pkeys(struct qib_devdata *dd, u8 port, u16 *pkeys)
{
        struct qib_pportdata *ppd = dd->pport + port - 1;
        /*
         * always a kernel context, no locking needed.
         * If we get here with ppd setup, no need to check
         * that pd is valid.
         */
        struct qib_ctxtdata *rcd = dd->rcd[ppd->hw_pidx];

        memcpy(pkeys, rcd->pkeys, sizeof(rcd->pkeys));

        return 0;
}

static int subn_get_pkeytable(struct ib_smp *smp, struct ib_device *ibdev,
                              u8 port)
{
        u32 startpx = 32 * (be32_to_cpu(smp->attr_mod) & 0xffff);
        u16 *p = (u16 *) smp->data;
        __be16 *q = (__be16 *) smp->data;

        /* 64 blocks of 32 16-bit P_Key entries */

        memset(smp->data, 0, sizeof(smp->data));
        if (startpx == 0) {
                struct qib_devdata *dd = dd_from_ibdev(ibdev);
                unsigned i, n = qib_get_npkeys(dd);

                get_pkeys(dd, port, p);

                for (i = 0; i < n; i++)
                        q[i] = cpu_to_be16(p[i]);
        } else
                smp->status |= IB_SMP_INVALID_FIELD;

        return reply(smp);
}

static int subn_set_guidinfo(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct qib_devdata *dd = dd_from_ibdev(ibdev);
        u32 startgx = 8 * be32_to_cpu(smp->attr_mod);
        __be64 *p = (__be64 *) smp->data;
        unsigned pidx = port - 1; /* IB number port from 1, hdw from 0 */

        /* 32 blocks of 8 64-bit GUIDs per block */

        if (startgx == 0 && pidx < dd->num_pports) {
                struct qib_pportdata *ppd = dd->pport + pidx;
                struct qib_ibport *ibp = &ppd->ibport_data;
                unsigned i;

                /* The first entry is read-only. */
                for (i = 1; i < QIB_GUIDS_PER_PORT; i++)
                        ibp->guids[i - 1] = p[i];
        } else
                smp->status |= IB_SMP_INVALID_FIELD;

        /* The only GUID we support is the first read-only entry. */
        return subn_get_guidinfo(smp, ibdev, port);
}

/**
 * subn_set_portinfo - set port information
 * @smp: the incoming SM packet
 * @ibdev: the infiniband device
 * @port: the port on the device
 *
 * Set Portinfo (see ch. 14.2.5.6).
 */
static int subn_set_portinfo(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct ib_port_info *pip = (struct ib_port_info *)smp->data;
        struct ib_event event;
        struct qib_devdata *dd;
        struct qib_pportdata *ppd;
        struct qib_ibport *ibp;
        u8 clientrereg = (pip->clientrereg_resv_subnetto & 0x80);
        unsigned long flags;
        u16 lid, smlid;
        u8 lwe;
        u8 lse;
        u8 state;
        u8 vls;
        u8 msl;
        u16 lstate;
        int ret, ore, mtu;
        u32 port_num = be32_to_cpu(smp->attr_mod);

        if (port_num == 0)
                port_num = port;
        else {
                if (port_num > ibdev->phys_port_cnt)
                        goto err;
                /* Port attributes can only be set on the receiving port */
                if (port_num != port)
                        goto get_only;
        }

        dd = dd_from_ibdev(ibdev);
        /* IB numbers ports from 1, hdw from 0 */
        ppd = dd->pport + (port_num - 1);
        ibp = &ppd->ibport_data;
        event.device = ibdev;
        event.element.port_num = port;

        ibp->rvp.mkey = pip->mkey;
        ibp->rvp.gid_prefix = pip->gid_prefix;
        ibp->rvp.mkey_lease_period = be16_to_cpu(pip->mkey_lease_period);

        lid = be16_to_cpu(pip->lid);
        /* Must be a valid unicast LID address. */
        if (lid == 0 || lid >= be16_to_cpu(IB_MULTICAST_LID_BASE))
                smp->status |= IB_SMP_INVALID_FIELD;
        else if (ppd->lid != lid || ppd->lmc != (pip->mkeyprot_resv_lmc & 7)) {
                if (ppd->lid != lid)
                        qib_set_uevent_bits(ppd, _QIB_EVENT_LID_CHANGE_BIT);
                if (ppd->lmc != (pip->mkeyprot_resv_lmc & 7))
                        qib_set_uevent_bits(ppd, _QIB_EVENT_LMC_CHANGE_BIT);
                qib_set_lid(ppd, lid, pip->mkeyprot_resv_lmc & 7);
                event.event = IB_EVENT_LID_CHANGE;
                ib_dispatch_event(&event);
        }

        smlid = be16_to_cpu(pip->sm_lid);
        msl = pip->neighbormtu_mastersmsl & 0xF;
        /* Must be a valid unicast LID address. */
        if (smlid == 0 || smlid >= be16_to_cpu(IB_MULTICAST_LID_BASE))
                smp->status |= IB_SMP_INVALID_FIELD;
        else if (smlid != ibp->rvp.sm_lid || msl != ibp->rvp.sm_sl) {
                spin_lock_irqsave(&ibp->rvp.lock, flags);
                if (ibp->rvp.sm_ah) {
                        if (smlid != ibp->rvp.sm_lid)
                                rdma_ah_set_dlid(&ibp->rvp.sm_ah->attr,
                                                 smlid);
                        if (msl != ibp->rvp.sm_sl)
                                rdma_ah_set_sl(&ibp->rvp.sm_ah->attr, msl);
                }
                spin_unlock_irqrestore(&ibp->rvp.lock, flags);
                if (smlid != ibp->rvp.sm_lid)
                        ibp->rvp.sm_lid = smlid;
                if (msl != ibp->rvp.sm_sl)
                        ibp->rvp.sm_sl = msl;
                event.event = IB_EVENT_SM_CHANGE;
                ib_dispatch_event(&event);
        }

        /* Allow 1x or 4x to be set (see 14.2.6.6). */
        lwe = pip->link_width_enabled;
        if (lwe) {
                if (lwe == 0xFF)
                        set_link_width_enabled(ppd, ppd->link_width_supported);
                else if (lwe >= 16 || (lwe & ~ppd->link_width_supported))
                        smp->status |= IB_SMP_INVALID_FIELD;
                else if (lwe != ppd->link_width_enabled)
                        set_link_width_enabled(ppd, lwe);
        }

        lse = pip->linkspeedactive_enabled & 0xF;
        if (lse) {
                /*
                 * The IB 1.2 spec. only allows link speed values
                 * 1, 3, 5, 7, 15.  1.2.1 extended to allow specific
                 * speeds.
                 */
                if (lse == 15)
                        set_link_speed_enabled(ppd,
                                               ppd->link_speed_supported);
                else if (lse >= 8 || (lse & ~ppd->link_speed_supported))
                        smp->status |= IB_SMP_INVALID_FIELD;
                else if (lse != ppd->link_speed_enabled)
                        set_link_speed_enabled(ppd, lse);
        }

        /* Set link down default state. */
        switch (pip->portphysstate_linkdown & 0xF) {
        case 0: /* NOP */
                break;
        case 1: /* SLEEP */
                (void) dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LINKDEFAULT,
                                        IB_LINKINITCMD_SLEEP);
                break;
        case 2: /* POLL */
                (void) dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LINKDEFAULT,
                                        IB_LINKINITCMD_POLL);
                break;
        default:
                smp->status |= IB_SMP_INVALID_FIELD;
        }

        ibp->rvp.mkeyprot = pip->mkeyprot_resv_lmc >> 6;
        ibp->rvp.vl_high_limit = pip->vl_high_limit;
        (void) dd->f_set_ib_cfg(ppd, QIB_IB_CFG_VL_HIGH_LIMIT,
                                    ibp->rvp.vl_high_limit);

        mtu = ib_mtu_enum_to_int((pip->neighbormtu_mastersmsl >> 4) & 0xF);
        if (mtu == -1)
                smp->status |= IB_SMP_INVALID_FIELD;
        else
                qib_set_mtu(ppd, mtu);

        /* Set operational VLs */
        vls = (pip->operationalvl_pei_peo_fpi_fpo >> 4) & 0xF;
        if (vls) {
                if (vls > ppd->vls_supported)
                        smp->status |= IB_SMP_INVALID_FIELD;
                else
                        (void) dd->f_set_ib_cfg(ppd, QIB_IB_CFG_OP_VLS, vls);
        }

        if (pip->mkey_violations == 0)
                ibp->rvp.mkey_violations = 0;

        if (pip->pkey_violations == 0)
                ibp->rvp.pkey_violations = 0;

        if (pip->qkey_violations == 0)
                ibp->rvp.qkey_violations = 0;

        ore = pip->localphyerrors_overrunerrors;
        if (set_phyerrthreshold(ppd, (ore >> 4) & 0xF))
                smp->status |= IB_SMP_INVALID_FIELD;

        if (set_overrunthreshold(ppd, (ore & 0xF)))
                smp->status |= IB_SMP_INVALID_FIELD;

        ibp->rvp.subnet_timeout = pip->clientrereg_resv_subnetto & 0x1F;

        /*
         * Do the port state change now that the other link parameters
         * have been set.
         * Changing the port physical state only makes sense if the link
         * is down or is being set to down.
         */
        state = pip->linkspeed_portstate & 0xF;
        lstate = (pip->portphysstate_linkdown >> 4) & 0xF;
        if (lstate && !(state == IB_PORT_DOWN || state == IB_PORT_NOP))
                smp->status |= IB_SMP_INVALID_FIELD;

        /*
         * Only state changes of DOWN, ARM, and ACTIVE are valid
         * and must be in the correct state to take effect (see 7.2.6).
         */
        switch (state) {
        case IB_PORT_NOP:
                if (lstate == 0)
                        break;
                fallthrough;
        case IB_PORT_DOWN:
                if (lstate == 0)
                        lstate = QIB_IB_LINKDOWN_ONLY;
                else if (lstate == 1)
                        lstate = QIB_IB_LINKDOWN_SLEEP;
                else if (lstate == 2)
                        lstate = QIB_IB_LINKDOWN;
                else if (lstate == 3)
                        lstate = QIB_IB_LINKDOWN_DISABLE;
                else {
                        smp->status |= IB_SMP_INVALID_FIELD;
                        break;
                }
                spin_lock_irqsave(&ppd->lflags_lock, flags);
                ppd->lflags &= ~QIBL_LINKV;
                spin_unlock_irqrestore(&ppd->lflags_lock, flags);
                qib_set_linkstate(ppd, lstate);
                /*
                 * Don't send a reply if the response would be sent
                 * through the disabled port.
                 */
                if (lstate == QIB_IB_LINKDOWN_DISABLE && smp->hop_cnt) {
                        ret = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
                        goto done;
                }
                qib_wait_linkstate(ppd, QIBL_LINKV, 10);
                break;
        case IB_PORT_ARMED:
                qib_set_linkstate(ppd, QIB_IB_LINKARM);
                break;
        case IB_PORT_ACTIVE:
                qib_set_linkstate(ppd, QIB_IB_LINKACTIVE);
                break;
        default:
                smp->status |= IB_SMP_INVALID_FIELD;
        }

        if (clientrereg) {
                event.event = IB_EVENT_CLIENT_REREGISTER;
                ib_dispatch_event(&event);
        }

        /* restore re-reg bit per o14-12.2.1 */
        pip->clientrereg_resv_subnetto |= clientrereg;

        goto get_only;

err:
        smp->status |= IB_SMP_INVALID_FIELD;
get_only:
        ret = subn_get_portinfo(smp, ibdev, port);
done:
        return ret;
}

/**
 * rm_pkey - decrecment the reference count for the given PKEY
 * @ppd: the qlogic_ib device
 * @key: the PKEY index
 *
 * Return true if this was the last reference and the hardware table entry
 * needs to be changed.
 */
static int rm_pkey(struct qib_pportdata *ppd, u16 key)
{
        int i;
        int ret;

        for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
                if (ppd->pkeys[i] != key)
                        continue;
                if (atomic_dec_and_test(&ppd->pkeyrefs[i])) {
                        ppd->pkeys[i] = 0;
                        ret = 1;
                        goto bail;
                }
                break;
        }

        ret = 0;

bail:
        return ret;
}

/**
 * add_pkey - add the given PKEY to the hardware table
 * @ppd: the qlogic_ib device
 * @key: the PKEY
 *
 * Return an error code if unable to add the entry, zero if no change,
 * or 1 if the hardware PKEY register needs to be updated.
 */
static int add_pkey(struct qib_pportdata *ppd, u16 key)
{
        int i;
        u16 lkey = key & 0x7FFF;
        int any = 0;
        int ret;

        if (lkey == 0x7FFF) {
                ret = 0;
                goto bail;
        }

        /* Look for an empty slot or a matching PKEY. */
        for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
                if (!ppd->pkeys[i]) {
                        any++;
                        continue;
                }
                /* If it matches exactly, try to increment the ref count */
                if (ppd->pkeys[i] == key) {
                        if (atomic_inc_return(&ppd->pkeyrefs[i]) > 1) {
                                ret = 0;
                                goto bail;
                        }
                        /* Lost the race. Look for an empty slot below. */
                        atomic_dec(&ppd->pkeyrefs[i]);
                        any++;
                }
                /*
                 * It makes no sense to have both the limited and unlimited
                 * PKEY set at the same time since the unlimited one will
                 * disable the limited one.
                 */
                if ((ppd->pkeys[i] & 0x7FFF) == lkey) {
                        ret = -EEXIST;
                        goto bail;
                }
        }
        if (!any) {
                ret = -EBUSY;
                goto bail;
        }
        for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
                if (!ppd->pkeys[i] &&
                    atomic_inc_return(&ppd->pkeyrefs[i]) == 1) {
                        /* for qibstats, etc. */
                        ppd->pkeys[i] = key;
                        ret = 1;
                        goto bail;
                }
        }
        ret = -EBUSY;

bail:
        return ret;
}

/**
 * set_pkeys - set the PKEY table for ctxt 0
 * @dd: the qlogic_ib device
 * @port: the IB port number
 * @pkeys: the PKEY table
 */
static int set_pkeys(struct qib_devdata *dd, u8 port, u16 *pkeys)
{
        struct qib_pportdata *ppd;
        struct qib_ctxtdata *rcd;
        int i;
        int changed = 0;

        /*
         * IB port one/two always maps to context zero/one,
         * always a kernel context, no locking needed
         * If we get here with ppd setup, no need to check
         * that rcd is valid.
         */

        ppd = dd->pport + (port - 1);
        rcd = dd->rcd[ppd->hw_pidx];

        for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
                u16 key = pkeys[i];
                u16 okey = rcd->pkeys[i];

                if (key == okey)
                        continue;
                /*
                 * The value of this PKEY table entry is changing.
                 * Remove the old entry in the hardware's array of PKEYs.
                 */
                if (okey & 0x7FFF)
                        changed |= rm_pkey(ppd, okey);
                if (key & 0x7FFF) {
                        int ret = add_pkey(ppd, key);

                        if (ret < 0)
                                key = 0;
                        else
                                changed |= ret;
                }
                rcd->pkeys[i] = key;
        }
        if (changed) {
                struct ib_event event;

                (void) dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);

                event.event = IB_EVENT_PKEY_CHANGE;
                event.device = &dd->verbs_dev.rdi.ibdev;
                event.element.port_num = port;
                ib_dispatch_event(&event);
        }
        return 0;
}

static int subn_set_pkeytable(struct ib_smp *smp, struct ib_device *ibdev,
                              u8 port)
{
        u32 startpx = 32 * (be32_to_cpu(smp->attr_mod) & 0xffff);
        __be16 *p = (__be16 *) smp->data;
        u16 *q = (u16 *) smp->data;
        struct qib_devdata *dd = dd_from_ibdev(ibdev);
        unsigned i, n = qib_get_npkeys(dd);

        for (i = 0; i < n; i++)
                q[i] = be16_to_cpu(p[i]);

        if (startpx != 0 || set_pkeys(dd, port, q) != 0)
                smp->status |= IB_SMP_INVALID_FIELD;

        return subn_get_pkeytable(smp, ibdev, port);
}

static int subn_get_sl_to_vl(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct qib_ibport *ibp = to_iport(ibdev, port);
        u8 *p = (u8 *) smp->data;
        unsigned i;

        memset(smp->data, 0, sizeof(smp->data));

        if (!(ibp->rvp.port_cap_flags & IB_PORT_SL_MAP_SUP))
                smp->status |= IB_SMP_UNSUP_METHOD;
        else
                for (i = 0; i < ARRAY_SIZE(ibp->sl_to_vl); i += 2)
                        *p++ = (ibp->sl_to_vl[i] << 4) | ibp->sl_to_vl[i + 1];

        return reply(smp);
}

static int subn_set_sl_to_vl(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        struct qib_ibport *ibp = to_iport(ibdev, port);
        u8 *p = (u8 *) smp->data;
        unsigned i;

        if (!(ibp->rvp.port_cap_flags & IB_PORT_SL_MAP_SUP)) {
                smp->status |= IB_SMP_UNSUP_METHOD;
                return reply(smp);
        }

        for (i = 0; i < ARRAY_SIZE(ibp->sl_to_vl); i += 2, p++) {
                ibp->sl_to_vl[i] = *p >> 4;
                ibp->sl_to_vl[i + 1] = *p & 0xF;
        }
        qib_set_uevent_bits(ppd_from_ibp(to_iport(ibdev, port)),
                            _QIB_EVENT_SL2VL_CHANGE_BIT);

        return subn_get_sl_to_vl(smp, ibdev, port);
}

static int subn_get_vl_arb(struct ib_smp *smp, struct ib_device *ibdev,
                           u8 port)
{
        unsigned which = be32_to_cpu(smp->attr_mod) >> 16;
        struct qib_pportdata *ppd = ppd_from_ibp(to_iport(ibdev, port));

        memset(smp->data, 0, sizeof(smp->data));

        if (ppd->vls_supported == IB_VL_VL0)
                smp->status |= IB_SMP_UNSUP_METHOD;
        else if (which == IB_VLARB_LOWPRI_0_31)
                (void) ppd->dd->f_get_ib_table(ppd, QIB_IB_TBL_VL_LOW_ARB,
                                                   smp->data);
        else if (which == IB_VLARB_HIGHPRI_0_31)
                (void) ppd->dd->f_get_ib_table(ppd, QIB_IB_TBL_VL_HIGH_ARB,
                                                   smp->data);
        else
                smp->status |= IB_SMP_INVALID_FIELD;

        return reply(smp);
}

static int subn_set_vl_arb(struct ib_smp *smp, struct ib_device *ibdev,
                           u8 port)
{
        unsigned which = be32_to_cpu(smp->attr_mod) >> 16;
        struct qib_pportdata *ppd = ppd_from_ibp(to_iport(ibdev, port));

        if (ppd->vls_supported == IB_VL_VL0)
                smp->status |= IB_SMP_UNSUP_METHOD;
        else if (which == IB_VLARB_LOWPRI_0_31)
                (void) ppd->dd->f_set_ib_table(ppd, QIB_IB_TBL_VL_LOW_ARB,
                                                   smp->data);
        else if (which == IB_VLARB_HIGHPRI_0_31)
                (void) ppd->dd->f_set_ib_table(ppd, QIB_IB_TBL_VL_HIGH_ARB,
                                                   smp->data);
        else
                smp->status |= IB_SMP_INVALID_FIELD;

        return subn_get_vl_arb(smp, ibdev, port);
}

static int subn_trap_repress(struct ib_smp *smp, struct ib_device *ibdev,
                             u8 port)
{
        /*
         * For now, we only send the trap once so no need to process this.
         * o13-6, o13-7,
         * o14-3.a4 The SMA shall not send any message in response to a valid
         * SubnTrapRepress() message.
         */
        return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
}

static int pma_get_classportinfo(struct ib_pma_mad *pmp,
                                 struct ib_device *ibdev)
{
        struct ib_class_port_info *p =
                (struct ib_class_port_info *)pmp->data;
        struct qib_devdata *dd = dd_from_ibdev(ibdev);

        memset(pmp->data, 0, sizeof(pmp->data));

        if (pmp->mad_hdr.attr_mod != 0)
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;

        /* Note that AllPortSelect is not valid */
        p->base_version = 1;
        p->class_version = 1;
        p->capability_mask = IB_PMA_CLASS_CAP_EXT_WIDTH;
        /*
         * Set the most significant bit of CM2 to indicate support for
         * congestion statistics
         */
        ib_set_cpi_capmask2(p,
                            dd->psxmitwait_supported <<
                            (31 - IB_CLASS_PORT_INFO_RESP_TIME_FIELD_SIZE));
        /*
         * Expected response time is 4.096 usec. * 2^18 == 1.073741824 sec.
         */
        ib_set_cpi_resp_time(p, 18);

        return reply((struct ib_smp *) pmp);
}

static int pma_get_portsamplescontrol(struct ib_pma_mad *pmp,
                                      struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portsamplescontrol *p =
                (struct ib_pma_portsamplescontrol *)pmp->data;
        struct qib_ibdev *dev = to_idev(ibdev);
        struct qib_devdata *dd = dd_from_dev(dev);
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        unsigned long flags;
        u8 port_select = p->port_select;

        memset(pmp->data, 0, sizeof(pmp->data));

        p->port_select = port_select;
        if (pmp->mad_hdr.attr_mod != 0 || port_select != port) {
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
                goto bail;
        }
        spin_lock_irqsave(&ibp->rvp.lock, flags);
        p->tick = dd->f_get_ib_cfg(ppd, QIB_IB_CFG_PMA_TICKS);
        p->sample_status = dd->f_portcntr(ppd, QIBPORTCNTR_PSSTAT);
        p->counter_width = 4;   /* 32 bit counters */
        p->counter_mask0_9 = COUNTER_MASK0_9;
        p->sample_start = cpu_to_be32(ibp->rvp.pma_sample_start);
        p->sample_interval = cpu_to_be32(ibp->rvp.pma_sample_interval);
        p->tag = cpu_to_be16(ibp->rvp.pma_tag);
        p->counter_select[0] = ibp->rvp.pma_counter_select[0];
        p->counter_select[1] = ibp->rvp.pma_counter_select[1];
        p->counter_select[2] = ibp->rvp.pma_counter_select[2];
        p->counter_select[3] = ibp->rvp.pma_counter_select[3];
        p->counter_select[4] = ibp->rvp.pma_counter_select[4];
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

bail:
        return reply((struct ib_smp *) pmp);
}

static int pma_set_portsamplescontrol(struct ib_pma_mad *pmp,
                                      struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portsamplescontrol *p =
                (struct ib_pma_portsamplescontrol *)pmp->data;
        struct qib_ibdev *dev = to_idev(ibdev);
        struct qib_devdata *dd = dd_from_dev(dev);
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        unsigned long flags;
        u8 status, xmit_flags;
        int ret;

        if (pmp->mad_hdr.attr_mod != 0 || p->port_select != port) {
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
                ret = reply((struct ib_smp *) pmp);
                goto bail;
        }

        spin_lock_irqsave(&ibp->rvp.lock, flags);

        /* Port Sampling code owns the PS* HW counters */
        xmit_flags = ppd->cong_stats.flags;
        ppd->cong_stats.flags = IB_PMA_CONG_HW_CONTROL_SAMPLE;
        status = dd->f_portcntr(ppd, QIBPORTCNTR_PSSTAT);
        if (status == IB_PMA_SAMPLE_STATUS_DONE ||
            (status == IB_PMA_SAMPLE_STATUS_RUNNING &&
             xmit_flags == IB_PMA_CONG_HW_CONTROL_TIMER)) {
                ibp->rvp.pma_sample_start = be32_to_cpu(p->sample_start);
                ibp->rvp.pma_sample_interval = be32_to_cpu(p->sample_interval);
                ibp->rvp.pma_tag = be16_to_cpu(p->tag);
                ibp->rvp.pma_counter_select[0] = p->counter_select[0];
                ibp->rvp.pma_counter_select[1] = p->counter_select[1];
                ibp->rvp.pma_counter_select[2] = p->counter_select[2];
                ibp->rvp.pma_counter_select[3] = p->counter_select[3];
                ibp->rvp.pma_counter_select[4] = p->counter_select[4];
                dd->f_set_cntr_sample(ppd, ibp->rvp.pma_sample_interval,
                                      ibp->rvp.pma_sample_start);
        }
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        ret = pma_get_portsamplescontrol(pmp, ibdev, port);

bail:
        return ret;
}

static u64 get_counter(struct qib_ibport *ibp, struct qib_pportdata *ppd,
                       __be16 sel)
{
        u64 ret;

        switch (sel) {
        case IB_PMA_PORT_XMIT_DATA:
                ret = ppd->dd->f_portcntr(ppd, QIBPORTCNTR_PSXMITDATA);
                break;
        case IB_PMA_PORT_RCV_DATA:
                ret = ppd->dd->f_portcntr(ppd, QIBPORTCNTR_PSRCVDATA);
                break;
        case IB_PMA_PORT_XMIT_PKTS:
                ret = ppd->dd->f_portcntr(ppd, QIBPORTCNTR_PSXMITPKTS);
                break;
        case IB_PMA_PORT_RCV_PKTS:
                ret = ppd->dd->f_portcntr(ppd, QIBPORTCNTR_PSRCVPKTS);
                break;
        case IB_PMA_PORT_XMIT_WAIT:
                ret = ppd->dd->f_portcntr(ppd, QIBPORTCNTR_PSXMITWAIT);
                break;
        default:
                ret = 0;
        }

        return ret;
}

/* This function assumes that the xmit_wait lock is already held */
static u64 xmit_wait_get_value_delta(struct qib_pportdata *ppd)
{
        u32 delta;

        delta = get_counter(&ppd->ibport_data, ppd,
                            IB_PMA_PORT_XMIT_WAIT);
        return ppd->cong_stats.counter + delta;
}

static void cache_hw_sample_counters(struct qib_pportdata *ppd)
{
        struct qib_ibport *ibp = &ppd->ibport_data;

        ppd->cong_stats.counter_cache.psxmitdata =
                get_counter(ibp, ppd, IB_PMA_PORT_XMIT_DATA);
        ppd->cong_stats.counter_cache.psrcvdata =
                get_counter(ibp, ppd, IB_PMA_PORT_RCV_DATA);
        ppd->cong_stats.counter_cache.psxmitpkts =
                get_counter(ibp, ppd, IB_PMA_PORT_XMIT_PKTS);
        ppd->cong_stats.counter_cache.psrcvpkts =
                get_counter(ibp, ppd, IB_PMA_PORT_RCV_PKTS);
        ppd->cong_stats.counter_cache.psxmitwait =
                get_counter(ibp, ppd, IB_PMA_PORT_XMIT_WAIT);
}

static u64 get_cache_hw_sample_counters(struct qib_pportdata *ppd,
                                        __be16 sel)
{
        u64 ret;

        switch (sel) {
        case IB_PMA_PORT_XMIT_DATA:
                ret = ppd->cong_stats.counter_cache.psxmitdata;
                break;
        case IB_PMA_PORT_RCV_DATA:
                ret = ppd->cong_stats.counter_cache.psrcvdata;
                break;
        case IB_PMA_PORT_XMIT_PKTS:
                ret = ppd->cong_stats.counter_cache.psxmitpkts;
                break;
        case IB_PMA_PORT_RCV_PKTS:
                ret = ppd->cong_stats.counter_cache.psrcvpkts;
                break;
        case IB_PMA_PORT_XMIT_WAIT:
                ret = ppd->cong_stats.counter_cache.psxmitwait;
                break;
        default:
                ret = 0;
        }

        return ret;
}

static int pma_get_portsamplesresult(struct ib_pma_mad *pmp,
                                     struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portsamplesresult *p =
                (struct ib_pma_portsamplesresult *)pmp->data;
        struct qib_ibdev *dev = to_idev(ibdev);
        struct qib_devdata *dd = dd_from_dev(dev);
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        unsigned long flags;
        u8 status;
        int i;

        memset(pmp->data, 0, sizeof(pmp->data));
        spin_lock_irqsave(&ibp->rvp.lock, flags);
        p->tag = cpu_to_be16(ibp->rvp.pma_tag);
        if (ppd->cong_stats.flags == IB_PMA_CONG_HW_CONTROL_TIMER)
                p->sample_status = IB_PMA_SAMPLE_STATUS_DONE;
        else {
                status = dd->f_portcntr(ppd, QIBPORTCNTR_PSSTAT);
                p->sample_status = cpu_to_be16(status);
                if (status == IB_PMA_SAMPLE_STATUS_DONE) {
                        cache_hw_sample_counters(ppd);
                        ppd->cong_stats.counter =
                                xmit_wait_get_value_delta(ppd);
                        dd->f_set_cntr_sample(ppd,
                                              QIB_CONG_TIMER_PSINTERVAL, 0);
                        ppd->cong_stats.flags = IB_PMA_CONG_HW_CONTROL_TIMER;
                }
        }
        for (i = 0; i < ARRAY_SIZE(ibp->rvp.pma_counter_select); i++)
                p->counter[i] = cpu_to_be32(
                        get_cache_hw_sample_counters(
                                ppd, ibp->rvp.pma_counter_select[i]));
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        return reply((struct ib_smp *) pmp);
}

static int pma_get_portsamplesresult_ext(struct ib_pma_mad *pmp,
                                         struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portsamplesresult_ext *p =
                (struct ib_pma_portsamplesresult_ext *)pmp->data;
        struct qib_ibdev *dev = to_idev(ibdev);
        struct qib_devdata *dd = dd_from_dev(dev);
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        unsigned long flags;
        u8 status;
        int i;

        /* Port Sampling code owns the PS* HW counters */
        memset(pmp->data, 0, sizeof(pmp->data));
        spin_lock_irqsave(&ibp->rvp.lock, flags);
        p->tag = cpu_to_be16(ibp->rvp.pma_tag);
        if (ppd->cong_stats.flags == IB_PMA_CONG_HW_CONTROL_TIMER)
                p->sample_status = IB_PMA_SAMPLE_STATUS_DONE;
        else {
                status = dd->f_portcntr(ppd, QIBPORTCNTR_PSSTAT);
                p->sample_status = cpu_to_be16(status);
                /* 64 bits */
                p->extended_width = cpu_to_be32(0x80000000);
                if (status == IB_PMA_SAMPLE_STATUS_DONE) {
                        cache_hw_sample_counters(ppd);
                        ppd->cong_stats.counter =
                                xmit_wait_get_value_delta(ppd);
                        dd->f_set_cntr_sample(ppd,
                                              QIB_CONG_TIMER_PSINTERVAL, 0);
                        ppd->cong_stats.flags = IB_PMA_CONG_HW_CONTROL_TIMER;
                }
        }
        for (i = 0; i < ARRAY_SIZE(ibp->rvp.pma_counter_select); i++)
                p->counter[i] = cpu_to_be64(
                        get_cache_hw_sample_counters(
                                ppd, ibp->rvp.pma_counter_select[i]));
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        return reply((struct ib_smp *) pmp);
}

static int pma_get_portcounters(struct ib_pma_mad *pmp,
                                struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portcounters *p = (struct ib_pma_portcounters *)
                pmp->data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        struct qib_verbs_counters cntrs;
        u8 port_select = p->port_select;

        qib_get_counters(ppd, &cntrs);

        /* Adjust counters for any resets done. */
        cntrs.symbol_error_counter -= ibp->z_symbol_error_counter;
        cntrs.link_error_recovery_counter -=
                ibp->z_link_error_recovery_counter;
        cntrs.link_downed_counter -= ibp->z_link_downed_counter;
        cntrs.port_rcv_errors -= ibp->z_port_rcv_errors;
        cntrs.port_rcv_remphys_errors -= ibp->z_port_rcv_remphys_errors;
        cntrs.port_xmit_discards -= ibp->z_port_xmit_discards;
        cntrs.port_xmit_data -= ibp->z_port_xmit_data;
        cntrs.port_rcv_data -= ibp->z_port_rcv_data;
        cntrs.port_xmit_packets -= ibp->z_port_xmit_packets;
        cntrs.port_rcv_packets -= ibp->z_port_rcv_packets;
        cntrs.local_link_integrity_errors -=
                ibp->z_local_link_integrity_errors;
        cntrs.excessive_buffer_overrun_errors -=
                ibp->z_excessive_buffer_overrun_errors;
        cntrs.vl15_dropped -= ibp->z_vl15_dropped;
        cntrs.vl15_dropped += ibp->rvp.n_vl15_dropped;

        memset(pmp->data, 0, sizeof(pmp->data));

        p->port_select = port_select;
        if (pmp->mad_hdr.attr_mod != 0 || port_select != port)
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;

        if (cntrs.symbol_error_counter > 0xFFFFUL)
                p->symbol_error_counter = cpu_to_be16(0xFFFF);
        else
                p->symbol_error_counter =
                        cpu_to_be16((u16)cntrs.symbol_error_counter);
        if (cntrs.link_error_recovery_counter > 0xFFUL)
                p->link_error_recovery_counter = 0xFF;
        else
                p->link_error_recovery_counter =
                        (u8)cntrs.link_error_recovery_counter;
        if (cntrs.link_downed_counter > 0xFFUL)
                p->link_downed_counter = 0xFF;
        else
                p->link_downed_counter = (u8)cntrs.link_downed_counter;
        if (cntrs.port_rcv_errors > 0xFFFFUL)
                p->port_rcv_errors = cpu_to_be16(0xFFFF);
        else
                p->port_rcv_errors =
                        cpu_to_be16((u16) cntrs.port_rcv_errors);
        if (cntrs.port_rcv_remphys_errors > 0xFFFFUL)
                p->port_rcv_remphys_errors = cpu_to_be16(0xFFFF);
        else
                p->port_rcv_remphys_errors =
                        cpu_to_be16((u16)cntrs.port_rcv_remphys_errors);
        if (cntrs.port_xmit_discards > 0xFFFFUL)
                p->port_xmit_discards = cpu_to_be16(0xFFFF);
        else
                p->port_xmit_discards =
                        cpu_to_be16((u16)cntrs.port_xmit_discards);
        if (cntrs.local_link_integrity_errors > 0xFUL)
                cntrs.local_link_integrity_errors = 0xFUL;
        if (cntrs.excessive_buffer_overrun_errors > 0xFUL)
                cntrs.excessive_buffer_overrun_errors = 0xFUL;
        p->link_overrun_errors = (cntrs.local_link_integrity_errors << 4) |
                cntrs.excessive_buffer_overrun_errors;
        if (cntrs.vl15_dropped > 0xFFFFUL)
                p->vl15_dropped = cpu_to_be16(0xFFFF);
        else
                p->vl15_dropped = cpu_to_be16((u16)cntrs.vl15_dropped);
        if (cntrs.port_xmit_data > 0xFFFFFFFFUL)
                p->port_xmit_data = cpu_to_be32(0xFFFFFFFF);
        else
                p->port_xmit_data = cpu_to_be32((u32)cntrs.port_xmit_data);
        if (cntrs.port_rcv_data > 0xFFFFFFFFUL)
                p->port_rcv_data = cpu_to_be32(0xFFFFFFFF);
        else
                p->port_rcv_data = cpu_to_be32((u32)cntrs.port_rcv_data);
        if (cntrs.port_xmit_packets > 0xFFFFFFFFUL)
                p->port_xmit_packets = cpu_to_be32(0xFFFFFFFF);
        else
                p->port_xmit_packets =
                        cpu_to_be32((u32)cntrs.port_xmit_packets);
        if (cntrs.port_rcv_packets > 0xFFFFFFFFUL)
                p->port_rcv_packets = cpu_to_be32(0xFFFFFFFF);
        else
                p->port_rcv_packets =
                        cpu_to_be32((u32) cntrs.port_rcv_packets);

        return reply((struct ib_smp *) pmp);
}

static int pma_get_portcounters_cong(struct ib_pma_mad *pmp,
                                     struct ib_device *ibdev, u8 port)
{
        /* Congestion PMA packets start at offset 24 not 64 */
        struct ib_pma_portcounters_cong *p =
                (struct ib_pma_portcounters_cong *)pmp->reserved;
        struct qib_verbs_counters cntrs;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        struct qib_devdata *dd = dd_from_ppd(ppd);
        u32 port_select = be32_to_cpu(pmp->mad_hdr.attr_mod) & 0xFF;
        u64 xmit_wait_counter;
        unsigned long flags;

        /*
         * This check is performed only in the GET method because the
         * SET method ends up calling this anyway.
         */
        if (!dd->psxmitwait_supported)
                pmp->mad_hdr.status |= IB_SMP_UNSUP_METH_ATTR;
        if (port_select != port)
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;

        qib_get_counters(ppd, &cntrs);
        spin_lock_irqsave(&ppd->ibport_data.rvp.lock, flags);
        xmit_wait_counter = xmit_wait_get_value_delta(ppd);
        spin_unlock_irqrestore(&ppd->ibport_data.rvp.lock, flags);

        /* Adjust counters for any resets done. */
        cntrs.symbol_error_counter -= ibp->z_symbol_error_counter;
        cntrs.link_error_recovery_counter -=
                ibp->z_link_error_recovery_counter;
        cntrs.link_downed_counter -= ibp->z_link_downed_counter;
        cntrs.port_rcv_errors -= ibp->z_port_rcv_errors;
        cntrs.port_rcv_remphys_errors -=
                ibp->z_port_rcv_remphys_errors;
        cntrs.port_xmit_discards -= ibp->z_port_xmit_discards;
        cntrs.local_link_integrity_errors -=
                ibp->z_local_link_integrity_errors;
        cntrs.excessive_buffer_overrun_errors -=
                ibp->z_excessive_buffer_overrun_errors;
        cntrs.vl15_dropped -= ibp->z_vl15_dropped;
        cntrs.vl15_dropped += ibp->rvp.n_vl15_dropped;
        cntrs.port_xmit_data -= ibp->z_port_xmit_data;
        cntrs.port_rcv_data -= ibp->z_port_rcv_data;
        cntrs.port_xmit_packets -= ibp->z_port_xmit_packets;
        cntrs.port_rcv_packets -= ibp->z_port_rcv_packets;

        memset(pmp->reserved, 0, sizeof(pmp->reserved));
        memset(pmp->data, 0, sizeof(pmp->data));

        /*
         * Set top 3 bits to indicate interval in picoseconds in
         * remaining bits.
         */
        p->port_check_rate =
                cpu_to_be16((QIB_XMIT_RATE_PICO << 13) |
                            (dd->psxmitwait_check_rate &
                             ~(QIB_XMIT_RATE_PICO << 13)));
        p->port_adr_events = cpu_to_be64(0);
        p->port_xmit_wait = cpu_to_be64(xmit_wait_counter);
        p->port_xmit_data = cpu_to_be64(cntrs.port_xmit_data);
        p->port_rcv_data = cpu_to_be64(cntrs.port_rcv_data);
        p->port_xmit_packets =
                cpu_to_be64(cntrs.port_xmit_packets);
        p->port_rcv_packets =
                cpu_to_be64(cntrs.port_rcv_packets);
        if (cntrs.symbol_error_counter > 0xFFFFUL)
                p->symbol_error_counter = cpu_to_be16(0xFFFF);
        else
                p->symbol_error_counter =
                        cpu_to_be16(
                                (u16)cntrs.symbol_error_counter);
        if (cntrs.link_error_recovery_counter > 0xFFUL)
                p->link_error_recovery_counter = 0xFF;
        else
                p->link_error_recovery_counter =
                        (u8)cntrs.link_error_recovery_counter;
        if (cntrs.link_downed_counter > 0xFFUL)
                p->link_downed_counter = 0xFF;
        else
                p->link_downed_counter =
                        (u8)cntrs.link_downed_counter;
        if (cntrs.port_rcv_errors > 0xFFFFUL)
                p->port_rcv_errors = cpu_to_be16(0xFFFF);
        else
                p->port_rcv_errors =
                        cpu_to_be16((u16) cntrs.port_rcv_errors);
        if (cntrs.port_rcv_remphys_errors > 0xFFFFUL)
                p->port_rcv_remphys_errors = cpu_to_be16(0xFFFF);
        else
                p->port_rcv_remphys_errors =
                        cpu_to_be16(
                                (u16)cntrs.port_rcv_remphys_errors);
        if (cntrs.port_xmit_discards > 0xFFFFUL)
                p->port_xmit_discards = cpu_to_be16(0xFFFF);
        else
                p->port_xmit_discards =
                        cpu_to_be16((u16)cntrs.port_xmit_discards);
        if (cntrs.local_link_integrity_errors > 0xFUL)
                cntrs.local_link_integrity_errors = 0xFUL;
        if (cntrs.excessive_buffer_overrun_errors > 0xFUL)
                cntrs.excessive_buffer_overrun_errors = 0xFUL;
        p->link_overrun_errors = (cntrs.local_link_integrity_errors << 4) |
                cntrs.excessive_buffer_overrun_errors;
        if (cntrs.vl15_dropped > 0xFFFFUL)
                p->vl15_dropped = cpu_to_be16(0xFFFF);
        else
                p->vl15_dropped = cpu_to_be16((u16)cntrs.vl15_dropped);

        return reply((struct ib_smp *)pmp);
}

static void qib_snapshot_pmacounters(
        struct qib_ibport *ibp,
        struct qib_pma_counters *pmacounters)
{
        struct qib_pma_counters *p;
        int cpu;

        memset(pmacounters, 0, sizeof(*pmacounters));
        for_each_possible_cpu(cpu) {
                p = per_cpu_ptr(ibp->pmastats, cpu);
                pmacounters->n_unicast_xmit += p->n_unicast_xmit;
                pmacounters->n_unicast_rcv += p->n_unicast_rcv;
                pmacounters->n_multicast_xmit += p->n_multicast_xmit;
                pmacounters->n_multicast_rcv += p->n_multicast_rcv;
        }
}

static int pma_get_portcounters_ext(struct ib_pma_mad *pmp,
                                    struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portcounters_ext *p =
                (struct ib_pma_portcounters_ext *)pmp->data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        u64 swords, rwords, spkts, rpkts, xwait;
        struct qib_pma_counters pma;
        u8 port_select = p->port_select;

        memset(pmp->data, 0, sizeof(pmp->data));

        p->port_select = port_select;
        if (pmp->mad_hdr.attr_mod != 0 || port_select != port) {
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
                goto bail;
        }

        qib_snapshot_counters(ppd, &swords, &rwords, &spkts, &rpkts, &xwait);

        /* Adjust counters for any resets done. */
        swords -= ibp->z_port_xmit_data;
        rwords -= ibp->z_port_rcv_data;
        spkts -= ibp->z_port_xmit_packets;
        rpkts -= ibp->z_port_rcv_packets;

        p->port_xmit_data = cpu_to_be64(swords);
        p->port_rcv_data = cpu_to_be64(rwords);
        p->port_xmit_packets = cpu_to_be64(spkts);
        p->port_rcv_packets = cpu_to_be64(rpkts);

        qib_snapshot_pmacounters(ibp, &pma);

        p->port_unicast_xmit_packets = cpu_to_be64(pma.n_unicast_xmit
                - ibp->z_unicast_xmit);
        p->port_unicast_rcv_packets = cpu_to_be64(pma.n_unicast_rcv
                - ibp->z_unicast_rcv);
        p->port_multicast_xmit_packets = cpu_to_be64(pma.n_multicast_xmit
                - ibp->z_multicast_xmit);
        p->port_multicast_rcv_packets = cpu_to_be64(pma.n_multicast_rcv
                - ibp->z_multicast_rcv);

bail:
        return reply((struct ib_smp *) pmp);
}

static int pma_set_portcounters(struct ib_pma_mad *pmp,
                                struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portcounters *p = (struct ib_pma_portcounters *)
                pmp->data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        struct qib_verbs_counters cntrs;

        /*
         * Since the HW doesn't support clearing counters, we save the
         * current count and subtract it from future responses.
         */
        qib_get_counters(ppd, &cntrs);

        if (p->counter_select & IB_PMA_SEL_SYMBOL_ERROR)
                ibp->z_symbol_error_counter = cntrs.symbol_error_counter;

        if (p->counter_select & IB_PMA_SEL_LINK_ERROR_RECOVERY)
                ibp->z_link_error_recovery_counter =
                        cntrs.link_error_recovery_counter;

        if (p->counter_select & IB_PMA_SEL_LINK_DOWNED)
                ibp->z_link_downed_counter = cntrs.link_downed_counter;

        if (p->counter_select & IB_PMA_SEL_PORT_RCV_ERRORS)
                ibp->z_port_rcv_errors = cntrs.port_rcv_errors;

        if (p->counter_select & IB_PMA_SEL_PORT_RCV_REMPHYS_ERRORS)
                ibp->z_port_rcv_remphys_errors =
                        cntrs.port_rcv_remphys_errors;

        if (p->counter_select & IB_PMA_SEL_PORT_XMIT_DISCARDS)
                ibp->z_port_xmit_discards = cntrs.port_xmit_discards;

        if (p->counter_select & IB_PMA_SEL_LOCAL_LINK_INTEGRITY_ERRORS)
                ibp->z_local_link_integrity_errors =
                        cntrs.local_link_integrity_errors;

        if (p->counter_select & IB_PMA_SEL_EXCESSIVE_BUFFER_OVERRUNS)
                ibp->z_excessive_buffer_overrun_errors =
                        cntrs.excessive_buffer_overrun_errors;

        if (p->counter_select & IB_PMA_SEL_PORT_VL15_DROPPED) {
                ibp->rvp.n_vl15_dropped = 0;
                ibp->z_vl15_dropped = cntrs.vl15_dropped;
        }

        if (p->counter_select & IB_PMA_SEL_PORT_XMIT_DATA)
                ibp->z_port_xmit_data = cntrs.port_xmit_data;

        if (p->counter_select & IB_PMA_SEL_PORT_RCV_DATA)
                ibp->z_port_rcv_data = cntrs.port_rcv_data;

        if (p->counter_select & IB_PMA_SEL_PORT_XMIT_PACKETS)
                ibp->z_port_xmit_packets = cntrs.port_xmit_packets;

        if (p->counter_select & IB_PMA_SEL_PORT_RCV_PACKETS)
                ibp->z_port_rcv_packets = cntrs.port_rcv_packets;

        return pma_get_portcounters(pmp, ibdev, port);
}

static int pma_set_portcounters_cong(struct ib_pma_mad *pmp,
                                     struct ib_device *ibdev, u8 port)
{
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        struct qib_devdata *dd = dd_from_ppd(ppd);
        struct qib_verbs_counters cntrs;
        u32 counter_select = (be32_to_cpu(pmp->mad_hdr.attr_mod) >> 24) & 0xFF;
        int ret = 0;
        unsigned long flags;

        qib_get_counters(ppd, &cntrs);
        /* Get counter values before we save them */
        ret = pma_get_portcounters_cong(pmp, ibdev, port);

        if (counter_select & IB_PMA_SEL_CONG_XMIT) {
                spin_lock_irqsave(&ppd->ibport_data.rvp.lock, flags);
                ppd->cong_stats.counter = 0;
                dd->f_set_cntr_sample(ppd, QIB_CONG_TIMER_PSINTERVAL,
                                      0x0);
                spin_unlock_irqrestore(&ppd->ibport_data.rvp.lock, flags);
        }
        if (counter_select & IB_PMA_SEL_CONG_PORT_DATA) {
                ibp->z_port_xmit_data = cntrs.port_xmit_data;
                ibp->z_port_rcv_data = cntrs.port_rcv_data;
                ibp->z_port_xmit_packets = cntrs.port_xmit_packets;
                ibp->z_port_rcv_packets = cntrs.port_rcv_packets;
        }
        if (counter_select & IB_PMA_SEL_CONG_ALL) {
                ibp->z_symbol_error_counter =
                        cntrs.symbol_error_counter;
                ibp->z_link_error_recovery_counter =
                        cntrs.link_error_recovery_counter;
                ibp->z_link_downed_counter =
                        cntrs.link_downed_counter;
                ibp->z_port_rcv_errors = cntrs.port_rcv_errors;
                ibp->z_port_rcv_remphys_errors =
                        cntrs.port_rcv_remphys_errors;
                ibp->z_port_xmit_discards =
                        cntrs.port_xmit_discards;
                ibp->z_local_link_integrity_errors =
                        cntrs.local_link_integrity_errors;
                ibp->z_excessive_buffer_overrun_errors =
                        cntrs.excessive_buffer_overrun_errors;
                ibp->rvp.n_vl15_dropped = 0;
                ibp->z_vl15_dropped = cntrs.vl15_dropped;
        }

        return ret;
}

static int pma_set_portcounters_ext(struct ib_pma_mad *pmp,
                                    struct ib_device *ibdev, u8 port)
{
        struct ib_pma_portcounters *p = (struct ib_pma_portcounters *)
                pmp->data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        u64 swords, rwords, spkts, rpkts, xwait;
        struct qib_pma_counters pma;

        qib_snapshot_counters(ppd, &swords, &rwords, &spkts, &rpkts, &xwait);

        if (p->counter_select & IB_PMA_SELX_PORT_XMIT_DATA)
                ibp->z_port_xmit_data = swords;

        if (p->counter_select & IB_PMA_SELX_PORT_RCV_DATA)
                ibp->z_port_rcv_data = rwords;

        if (p->counter_select & IB_PMA_SELX_PORT_XMIT_PACKETS)
                ibp->z_port_xmit_packets = spkts;

        if (p->counter_select & IB_PMA_SELX_PORT_RCV_PACKETS)
                ibp->z_port_rcv_packets = rpkts;

        qib_snapshot_pmacounters(ibp, &pma);

        if (p->counter_select & IB_PMA_SELX_PORT_UNI_XMIT_PACKETS)
                ibp->z_unicast_xmit = pma.n_unicast_xmit;

        if (p->counter_select & IB_PMA_SELX_PORT_UNI_RCV_PACKETS)
                ibp->z_unicast_rcv = pma.n_unicast_rcv;

        if (p->counter_select & IB_PMA_SELX_PORT_MULTI_XMIT_PACKETS)
                ibp->z_multicast_xmit = pma.n_multicast_xmit;

        if (p->counter_select & IB_PMA_SELX_PORT_MULTI_RCV_PACKETS)
                ibp->z_multicast_rcv = pma.n_multicast_rcv;

        return pma_get_portcounters_ext(pmp, ibdev, port);
}

static int process_subn(struct ib_device *ibdev, int mad_flags,
                        u8 port, const struct ib_mad *in_mad,
                        struct ib_mad *out_mad)
{
        struct ib_smp *smp = (struct ib_smp *)out_mad;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        int ret;

        *out_mad = *in_mad;
        if (smp->class_version != 1) {
                smp->status |= IB_SMP_UNSUP_VERSION;
                ret = reply(smp);
                goto bail;
        }

        ret = check_mkey(ibp, smp, mad_flags);
        if (ret) {
                u32 port_num = be32_to_cpu(smp->attr_mod);

                /*
                 * If this is a get/set portinfo, we already check the
                 * M_Key if the MAD is for another port and the M_Key
                 * is OK on the receiving port. This check is needed
                 * to increment the error counters when the M_Key
                 * fails to match on *both* ports.
                 */
                if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
                    (smp->method == IB_MGMT_METHOD_GET ||
                     smp->method == IB_MGMT_METHOD_SET) &&
                    port_num && port_num <= ibdev->phys_port_cnt &&
                    port != port_num)
                        (void) check_mkey(to_iport(ibdev, port_num), smp, 0);
                ret = IB_MAD_RESULT_FAILURE;
                goto bail;
        }

        switch (smp->method) {
        case IB_MGMT_METHOD_GET:
                switch (smp->attr_id) {
                case IB_SMP_ATTR_NODE_DESC:
                        ret = subn_get_nodedescription(smp, ibdev);
                        goto bail;
                case IB_SMP_ATTR_NODE_INFO:
                        ret = subn_get_nodeinfo(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_GUID_INFO:
                        ret = subn_get_guidinfo(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_PORT_INFO:
                        ret = subn_get_portinfo(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_PKEY_TABLE:
                        ret = subn_get_pkeytable(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_SL_TO_VL_TABLE:
                        ret = subn_get_sl_to_vl(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_VL_ARB_TABLE:
                        ret = subn_get_vl_arb(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_SM_INFO:
                        if (ibp->rvp.port_cap_flags & IB_PORT_SM_DISABLED) {
                                ret = IB_MAD_RESULT_SUCCESS |
                                        IB_MAD_RESULT_CONSUMED;
                                goto bail;
                        }
                        if (ibp->rvp.port_cap_flags & IB_PORT_SM) {
                                ret = IB_MAD_RESULT_SUCCESS;
                                goto bail;
                        }
                        fallthrough;
                default:
                        smp->status |= IB_SMP_UNSUP_METH_ATTR;
                        ret = reply(smp);
                        goto bail;
                }

        case IB_MGMT_METHOD_SET:
                switch (smp->attr_id) {
                case IB_SMP_ATTR_GUID_INFO:
                        ret = subn_set_guidinfo(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_PORT_INFO:
                        ret = subn_set_portinfo(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_PKEY_TABLE:
                        ret = subn_set_pkeytable(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_SL_TO_VL_TABLE:
                        ret = subn_set_sl_to_vl(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_VL_ARB_TABLE:
                        ret = subn_set_vl_arb(smp, ibdev, port);
                        goto bail;
                case IB_SMP_ATTR_SM_INFO:
                        if (ibp->rvp.port_cap_flags & IB_PORT_SM_DISABLED) {
                                ret = IB_MAD_RESULT_SUCCESS |
                                        IB_MAD_RESULT_CONSUMED;
                                goto bail;
                        }
                        if (ibp->rvp.port_cap_flags & IB_PORT_SM) {
                                ret = IB_MAD_RESULT_SUCCESS;
                                goto bail;
                        }
                        fallthrough;
                default:
                        smp->status |= IB_SMP_UNSUP_METH_ATTR;
                        ret = reply(smp);
                        goto bail;
                }

        case IB_MGMT_METHOD_TRAP_REPRESS:
                if (smp->attr_id == IB_SMP_ATTR_NOTICE)
                        ret = subn_trap_repress(smp, ibdev, port);
                else {
                        smp->status |= IB_SMP_UNSUP_METH_ATTR;
                        ret = reply(smp);
                }
                goto bail;

        case IB_MGMT_METHOD_TRAP:
        case IB_MGMT_METHOD_REPORT:
        case IB_MGMT_METHOD_REPORT_RESP:
        case IB_MGMT_METHOD_GET_RESP:
                /*
                 * The ib_mad module will call us to process responses
                 * before checking for other consumers.
                 * Just tell the caller to process it normally.
                 */
                ret = IB_MAD_RESULT_SUCCESS;
                goto bail;

        case IB_MGMT_METHOD_SEND:
                if (ib_get_smp_direction(smp) &&
                    smp->attr_id == QIB_VENDOR_IPG) {
                        ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PORT,
                                              smp->data[0]);
                        ret = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
                } else
                        ret = IB_MAD_RESULT_SUCCESS;

                goto bail;

        default:
                smp->status |= IB_SMP_UNSUP_METHOD;
                ret = reply(smp);
        }

bail:
        return ret;
}

static int process_perf(struct ib_device *ibdev, u8 port,
                        const struct ib_mad *in_mad,
                        struct ib_mad *out_mad)
{
        struct ib_pma_mad *pmp = (struct ib_pma_mad *)out_mad;
        int ret;

        *out_mad = *in_mad;
        if (pmp->mad_hdr.class_version != 1) {
                pmp->mad_hdr.status |= IB_SMP_UNSUP_VERSION;
                ret = reply((struct ib_smp *) pmp);
                goto bail;
        }

        switch (pmp->mad_hdr.method) {
        case IB_MGMT_METHOD_GET:
                switch (pmp->mad_hdr.attr_id) {
                case IB_PMA_CLASS_PORT_INFO:
                        ret = pma_get_classportinfo(pmp, ibdev);
                        goto bail;
                case IB_PMA_PORT_SAMPLES_CONTROL:
                        ret = pma_get_portsamplescontrol(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_SAMPLES_RESULT:
                        ret = pma_get_portsamplesresult(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_SAMPLES_RESULT_EXT:
                        ret = pma_get_portsamplesresult_ext(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_COUNTERS:
                        ret = pma_get_portcounters(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_COUNTERS_EXT:
                        ret = pma_get_portcounters_ext(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_COUNTERS_CONG:
                        ret = pma_get_portcounters_cong(pmp, ibdev, port);
                        goto bail;
                default:
                        pmp->mad_hdr.status |= IB_SMP_UNSUP_METH_ATTR;
                        ret = reply((struct ib_smp *) pmp);
                        goto bail;
                }

        case IB_MGMT_METHOD_SET:
                switch (pmp->mad_hdr.attr_id) {
                case IB_PMA_PORT_SAMPLES_CONTROL:
                        ret = pma_set_portsamplescontrol(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_COUNTERS:
                        ret = pma_set_portcounters(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_COUNTERS_EXT:
                        ret = pma_set_portcounters_ext(pmp, ibdev, port);
                        goto bail;
                case IB_PMA_PORT_COUNTERS_CONG:
                        ret = pma_set_portcounters_cong(pmp, ibdev, port);
                        goto bail;
                default:
                        pmp->mad_hdr.status |= IB_SMP_UNSUP_METH_ATTR;
                        ret = reply((struct ib_smp *) pmp);
                        goto bail;
                }

        case IB_MGMT_METHOD_TRAP:
        case IB_MGMT_METHOD_GET_RESP:
                /*
                 * The ib_mad module will call us to process responses
                 * before checking for other consumers.
                 * Just tell the caller to process it normally.
                 */
                ret = IB_MAD_RESULT_SUCCESS;
                goto bail;

        default:
                pmp->mad_hdr.status |= IB_SMP_UNSUP_METHOD;
                ret = reply((struct ib_smp *) pmp);
        }

bail:
        return ret;
}

static int cc_get_classportinfo(struct ib_cc_mad *ccp,
                                struct ib_device *ibdev)
{
        struct ib_cc_classportinfo_attr *p =
                (struct ib_cc_classportinfo_attr *)ccp->mgmt_data;

        p->base_version = 1;
        p->class_version = 1;
        p->cap_mask = 0;

        /*
         * Expected response time is 4.096 usec. * 2^18 == 1.073741824 sec.
         */
        p->resp_time_value = 18;

        return reply((struct ib_smp *) ccp);
}

static int cc_get_congestion_info(struct ib_cc_mad *ccp,
                                struct ib_device *ibdev, u8 port)
{
        struct ib_cc_info_attr *p =
                (struct ib_cc_info_attr *)ccp->mgmt_data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);

        p->congestion_info = 0;
        p->control_table_cap = ppd->cc_max_table_entries;

        return reply((struct ib_smp *) ccp);
}

static int cc_get_congestion_setting(struct ib_cc_mad *ccp,
                                struct ib_device *ibdev, u8 port)
{
        int i;
        struct ib_cc_congestion_setting_attr *p =
                (struct ib_cc_congestion_setting_attr *)ccp->mgmt_data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        struct ib_cc_congestion_entry_shadow *entries;

        spin_lock(&ppd->cc_shadow_lock);

        entries = ppd->congestion_entries_shadow->entries;
        p->port_control = cpu_to_be16(
                ppd->congestion_entries_shadow->port_control);
        p->control_map = cpu_to_be16(
                ppd->congestion_entries_shadow->control_map);
        for (i = 0; i < IB_CC_CCS_ENTRIES; i++) {
                p->entries[i].ccti_increase = entries[i].ccti_increase;
                p->entries[i].ccti_timer = cpu_to_be16(entries[i].ccti_timer);
                p->entries[i].trigger_threshold = entries[i].trigger_threshold;
                p->entries[i].ccti_min = entries[i].ccti_min;
        }

        spin_unlock(&ppd->cc_shadow_lock);

        return reply((struct ib_smp *) ccp);
}

static int cc_get_congestion_control_table(struct ib_cc_mad *ccp,
                                struct ib_device *ibdev, u8 port)
{
        struct ib_cc_table_attr *p =
                (struct ib_cc_table_attr *)ccp->mgmt_data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        u32 cct_block_index = be32_to_cpu(ccp->attr_mod);
        u32 max_cct_block;
        u32 cct_entry;
        struct ib_cc_table_entry_shadow *entries;
        int i;

        /* Is the table index more than what is supported? */
        if (cct_block_index > IB_CC_TABLE_CAP_DEFAULT - 1)
                goto bail;

        spin_lock(&ppd->cc_shadow_lock);

        max_cct_block =
                (ppd->ccti_entries_shadow->ccti_last_entry + 1)/IB_CCT_ENTRIES;
        max_cct_block = max_cct_block ? max_cct_block - 1 : 0;

        if (cct_block_index > max_cct_block) {
                spin_unlock(&ppd->cc_shadow_lock);
                goto bail;
        }

        ccp->attr_mod = cpu_to_be32(cct_block_index);

        cct_entry = IB_CCT_ENTRIES * (cct_block_index + 1);

        cct_entry--;

        p->ccti_limit = cpu_to_be16(cct_entry);

        entries = &ppd->ccti_entries_shadow->
                        entries[IB_CCT_ENTRIES * cct_block_index];
        cct_entry %= IB_CCT_ENTRIES;

        for (i = 0; i <= cct_entry; i++)
                p->ccti_entries[i].entry = cpu_to_be16(entries[i].entry);

        spin_unlock(&ppd->cc_shadow_lock);

        return reply((struct ib_smp *) ccp);

bail:
        return reply_failure((struct ib_smp *) ccp);
}

static int cc_set_congestion_setting(struct ib_cc_mad *ccp,
                                struct ib_device *ibdev, u8 port)
{
        struct ib_cc_congestion_setting_attr *p =
                (struct ib_cc_congestion_setting_attr *)ccp->mgmt_data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        int i;

        ppd->cc_sl_control_map = be16_to_cpu(p->control_map);

        for (i = 0; i < IB_CC_CCS_ENTRIES; i++) {
                ppd->congestion_entries[i].ccti_increase =
                        p->entries[i].ccti_increase;

                ppd->congestion_entries[i].ccti_timer =
                        be16_to_cpu(p->entries[i].ccti_timer);

                ppd->congestion_entries[i].trigger_threshold =
                        p->entries[i].trigger_threshold;

                ppd->congestion_entries[i].ccti_min =
                        p->entries[i].ccti_min;
        }

        return reply((struct ib_smp *) ccp);
}

static int cc_set_congestion_control_table(struct ib_cc_mad *ccp,
                                struct ib_device *ibdev, u8 port)
{
        struct ib_cc_table_attr *p =
                (struct ib_cc_table_attr *)ccp->mgmt_data;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);
        u32 cct_block_index = be32_to_cpu(ccp->attr_mod);
        u32 cct_entry;
        struct ib_cc_table_entry_shadow *entries;
        int i;

        /* Is the table index more than what is supported? */
        if (cct_block_index > IB_CC_TABLE_CAP_DEFAULT - 1)
                goto bail;

        /* If this packet is the first in the sequence then
         * zero the total table entry count.
         */
        if (be16_to_cpu(p->ccti_limit) < IB_CCT_ENTRIES)
                ppd->total_cct_entry = 0;

        cct_entry = (be16_to_cpu(p->ccti_limit))%IB_CCT_ENTRIES;

        /* ccti_limit is 0 to 63 */
        ppd->total_cct_entry += (cct_entry + 1);

        if (ppd->total_cct_entry > ppd->cc_supported_table_entries)
                goto bail;

        ppd->ccti_limit = be16_to_cpu(p->ccti_limit);

        entries = ppd->ccti_entries + (IB_CCT_ENTRIES * cct_block_index);

        for (i = 0; i <= cct_entry; i++)
                entries[i].entry = be16_to_cpu(p->ccti_entries[i].entry);

        spin_lock(&ppd->cc_shadow_lock);

        ppd->ccti_entries_shadow->ccti_last_entry = ppd->total_cct_entry - 1;
        memcpy(ppd->ccti_entries_shadow->entries, ppd->ccti_entries,
                (ppd->total_cct_entry * sizeof(struct ib_cc_table_entry)));

        ppd->congestion_entries_shadow->port_control = IB_CC_CCS_PC_SL_BASED;
        ppd->congestion_entries_shadow->control_map = ppd->cc_sl_control_map;
        memcpy(ppd->congestion_entries_shadow->entries, ppd->congestion_entries,
                IB_CC_CCS_ENTRIES * sizeof(struct ib_cc_congestion_entry));

        spin_unlock(&ppd->cc_shadow_lock);

        return reply((struct ib_smp *) ccp);

bail:
        return reply_failure((struct ib_smp *) ccp);
}

static int process_cc(struct ib_device *ibdev, int mad_flags,
                        u8 port, const struct ib_mad *in_mad,
                        struct ib_mad *out_mad)
{
        struct ib_cc_mad *ccp = (struct ib_cc_mad *)out_mad;
        *out_mad = *in_mad;

        if (ccp->class_version != 2) {
                ccp->status |= IB_SMP_UNSUP_VERSION;
                return reply((struct ib_smp *)ccp);
        }

        switch (ccp->method) {
        case IB_MGMT_METHOD_GET:
                switch (ccp->attr_id) {
                case IB_CC_ATTR_CLASSPORTINFO:
                        return cc_get_classportinfo(ccp, ibdev);
                case IB_CC_ATTR_CONGESTION_INFO:
                        return cc_get_congestion_info(ccp, ibdev, port);
                case IB_CC_ATTR_CA_CONGESTION_SETTING:
                        return cc_get_congestion_setting(ccp, ibdev, port);
                case IB_CC_ATTR_CONGESTION_CONTROL_TABLE:
                        return cc_get_congestion_control_table(ccp, ibdev, port);
                default:
                        ccp->status |= IB_SMP_UNSUP_METH_ATTR;
                        return reply((struct ib_smp *) ccp);
                }
        case IB_MGMT_METHOD_SET:
                switch (ccp->attr_id) {
                case IB_CC_ATTR_CA_CONGESTION_SETTING:
                        return cc_set_congestion_setting(ccp, ibdev, port);
                case IB_CC_ATTR_CONGESTION_CONTROL_TABLE:
                        return cc_set_congestion_control_table(ccp, ibdev, port);
                default:
                        ccp->status |= IB_SMP_UNSUP_METH_ATTR;
                        return reply((struct ib_smp *) ccp);
                }
        case IB_MGMT_METHOD_GET_RESP:
                /*
                 * The ib_mad module will call us to process responses
                 * before checking for other consumers.
                 * Just tell the caller to process it normally.
                 */
                return IB_MAD_RESULT_SUCCESS;
        }

        /* method is unsupported */
        ccp->status |= IB_SMP_UNSUP_METHOD;
        return reply((struct ib_smp *) ccp);
}

/**
 * qib_process_mad - process an incoming MAD packet
 * @ibdev: the infiniband device this packet came in on
 * @mad_flags: MAD flags
 * @port: the port number this packet came in on
 * @in_wc: the work completion entry for this packet
 * @in_grh: the global route header for this packet
 * @in: the incoming MAD
 * @out: any outgoing MAD reply
 * @out_mad_size: size of the outgoing MAD reply
 * @out_mad_pkey_index: unused
 *
 * Returns IB_MAD_RESULT_SUCCESS if this is a MAD that we are not
 * interested in processing.
 *
 * Note that the verbs framework has already done the MAD sanity checks,
 * and hop count/pointer updating for IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
 * MADs.
 *
 * This is called by the ib_mad module.
 */
int qib_process_mad(struct ib_device *ibdev, int mad_flags, u32 port,
                    const struct ib_wc *in_wc, const struct ib_grh *in_grh,
                    const struct ib_mad *in, struct ib_mad *out,
                    size_t *out_mad_size, u16 *out_mad_pkey_index)
{
        int ret;
        struct qib_ibport *ibp = to_iport(ibdev, port);
        struct qib_pportdata *ppd = ppd_from_ibp(ibp);

        switch (in->mad_hdr.mgmt_class) {
        case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
        case IB_MGMT_CLASS_SUBN_LID_ROUTED:
                ret = process_subn(ibdev, mad_flags, port, in, out);
                goto bail;

        case IB_MGMT_CLASS_PERF_MGMT:
                ret = process_perf(ibdev, port, in, out);
                goto bail;

        case IB_MGMT_CLASS_CONG_MGMT:
                if (!ppd->congestion_entries_shadow ||
                         !qib_cc_table_size) {
                        ret = IB_MAD_RESULT_SUCCESS;
                        goto bail;
                }
                ret = process_cc(ibdev, mad_flags, port, in, out);
                goto bail;

        default:
                ret = IB_MAD_RESULT_SUCCESS;
        }

bail:
        return ret;
}

static void xmit_wait_timer_func(struct timer_list *t)
{
        struct qib_pportdata *ppd = from_timer(ppd, t, cong_stats.timer);
        struct qib_devdata *dd = dd_from_ppd(ppd);
        unsigned long flags;
        u8 status;

        spin_lock_irqsave(&ppd->ibport_data.rvp.lock, flags);
        if (ppd->cong_stats.flags == IB_PMA_CONG_HW_CONTROL_SAMPLE) {
                status = dd->f_portcntr(ppd, QIBPORTCNTR_PSSTAT);
                if (status == IB_PMA_SAMPLE_STATUS_DONE) {
                        /* save counter cache */
                        cache_hw_sample_counters(ppd);
                        ppd->cong_stats.flags = IB_PMA_CONG_HW_CONTROL_TIMER;
                } else
                        goto done;
        }
        ppd->cong_stats.counter = xmit_wait_get_value_delta(ppd);
        dd->f_set_cntr_sample(ppd, QIB_CONG_TIMER_PSINTERVAL, 0x0);
done:
        spin_unlock_irqrestore(&ppd->ibport_data.rvp.lock, flags);
        mod_timer(&ppd->cong_stats.timer, jiffies + HZ);
}

void qib_notify_create_mad_agent(struct rvt_dev_info *rdi, int port_idx)
{
        struct qib_ibdev *ibdev = container_of(rdi, struct qib_ibdev, rdi);
        struct qib_devdata *dd = container_of(ibdev,
                                              struct qib_devdata, verbs_dev);

        /* Initialize xmit_wait structure */
        dd->pport[port_idx].cong_stats.counter = 0;
        timer_setup(&dd->pport[port_idx].cong_stats.timer,
                    xmit_wait_timer_func, 0);
        dd->pport[port_idx].cong_stats.timer.expires = 0;
        add_timer(&dd->pport[port_idx].cong_stats.timer);
}

void qib_notify_free_mad_agent(struct rvt_dev_info *rdi, int port_idx)
{
        struct qib_ibdev *ibdev = container_of(rdi, struct qib_ibdev, rdi);
        struct qib_devdata *dd = container_of(ibdev,
                                              struct qib_devdata, verbs_dev);

        if (dd->pport[port_idx].cong_stats.timer.function)
                del_timer_sync(&dd->pport[port_idx].cong_stats.timer);

        if (dd->pport[port_idx].ibport_data.smi_ah)
                rdma_destroy_ah(&dd->pport[port_idx].ibport_data.smi_ah->ibah,
                                RDMA_DESTROY_AH_SLEEPABLE);
}