ipath_mad.c

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/*
 * Copyright (c) 2006, 2007, 2008 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 <rdma/ib_pma.h>

#include "ipath_kernel.h"
#include "ipath_verbs.h"
#include "ipath_common.h"

#define IB_SMP_UNSUP_VERSION    cpu_to_be16(0x0004)
#define IB_SMP_UNSUP_METHOD cpu_to_be16(0x0008)
#define IB_SMP_UNSUP_METH_ATTR  cpu_to_be16(0x000C)
#define IB_SMP_INVALID_FIELD    cpu_to_be16(0x001C)

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 recv_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);
}

struct nodeinfo {
    u8 base_version;
    u8 class_version;
    u8 node_type;
    u8 num_ports;
    __be64 sys_guid;
    __be64 node_guid;
    __be64 port_guid;
    __be16 partition_cap;
    __be16 device_id;
    __be32 revision;
    u8 local_port_num;
    u8 vendor_id[3];
} __attribute__ ((packed));

static int recv_subn_get_nodeinfo(struct ib_smp *smp,
                  struct ib_device *ibdev, u8 port)
{
    struct nodeinfo *nip = (struct nodeinfo *)&smp->data;
    struct ipath_devdata *dd = to_idev(ibdev)->dd;
    u32 vendor, majrev, minrev;

    /* GUID 0 is illegal */
    if (smp->attr_mod || (dd->ipath_guid == 0))
        smp->status |= IB_SMP_INVALID_FIELD;

    nip->base_version = 1;
    nip->class_version = 1;
    nip->node_type = 1; /* channel adapter */
    /*
     * XXX The num_ports value will need a layer function to get
     * the value if we ever have more than one IB port on a chip.
     * We will also need to get the GUID for the port.
     */
    nip->num_ports = ibdev->phys_port_cnt;
    /* This is already in network order */
    nip->sys_guid = to_idev(ibdev)->sys_image_guid;
    nip->node_guid = dd->ipath_guid;
    nip->port_guid = dd->ipath_guid;
    nip->partition_cap = cpu_to_be16(ipath_get_npkeys(dd));
    nip->device_id = cpu_to_be16(dd->ipath_deviceid);
    majrev = dd->ipath_majrev;
    minrev = dd->ipath_minrev;
    nip->revision = cpu_to_be32((majrev << 16) | minrev);
    nip->local_port_num = port;
    vendor = dd->ipath_vendorid;
    nip->vendor_id[0] = IPATH_SRC_OUI_1;
    nip->vendor_id[1] = IPATH_SRC_OUI_2;
    nip->vendor_id[2] = IPATH_SRC_OUI_3;

    return reply(smp);
}

static int recv_subn_get_guidinfo(struct ib_smp *smp,
                  struct ib_device *ibdev)
{
    u32 startgx = 8 * be32_to_cpu(smp->attr_mod);
    __be64 *p = (__be64 *) smp->data;

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

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

    /*
     * We only support one GUID for now.  If this changes, the
     * portinfo.guid_cap field needs to be updated too.
     */
    if (startgx == 0) {
        __be64 g = to_idev(ibdev)->dd->ipath_guid;
        if (g == 0)
            /* GUID 0 is illegal */
            smp->status |= IB_SMP_INVALID_FIELD;
        else
            /* The first is a copy of the read-only HW GUID. */
            *p = g;
    } else
        smp->status |= IB_SMP_INVALID_FIELD;

    return reply(smp);
}

static void set_link_width_enabled(struct ipath_devdata *dd, u32 w)
{
    (void) dd->ipath_f_set_ib_cfg(dd, IPATH_IB_CFG_LWID_ENB, w);
}

static void set_link_speed_enabled(struct ipath_devdata *dd, u32 s)
{
    (void) dd->ipath_f_set_ib_cfg(dd, IPATH_IB_CFG_SPD_ENB, s);
}

static int get_overrunthreshold(struct ipath_devdata *dd)
{
    return (dd->ipath_ibcctrl >>
        INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT) &
        INFINIPATH_IBCC_OVERRUNTHRESHOLD_MASK;
}

static int set_overrunthreshold(struct ipath_devdata *dd, unsigned n)
{
    unsigned v;

    v = (dd->ipath_ibcctrl >> INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT) &
        INFINIPATH_IBCC_OVERRUNTHRESHOLD_MASK;
    if (v != n) {
        dd->ipath_ibcctrl &=
            ~(INFINIPATH_IBCC_OVERRUNTHRESHOLD_MASK <<
              INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT);
        dd->ipath_ibcctrl |=
            (u64) n << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
        ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl,
                 dd->ipath_ibcctrl);
    }
    return 0;
}

static int get_phyerrthreshold(struct ipath_devdata *dd)
{
    return (dd->ipath_ibcctrl >>
        INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT) &
        INFINIPATH_IBCC_PHYERRTHRESHOLD_MASK;
}

static int set_phyerrthreshold(struct ipath_devdata *dd, unsigned n)
{
    unsigned v;

    v = (dd->ipath_ibcctrl >> INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT) &
        INFINIPATH_IBCC_PHYERRTHRESHOLD_MASK;
    if (v != n) {
        dd->ipath_ibcctrl &=
            ~(INFINIPATH_IBCC_PHYERRTHRESHOLD_MASK <<
              INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT);
        dd->ipath_ibcctrl |=
            (u64) n << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
        ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl,
                 dd->ipath_ibcctrl);
    }
    return 0;
}

static int get_linkdowndefaultstate(struct ipath_devdata *dd)
{
    return !!(dd->ipath_ibcctrl & INFINIPATH_IBCC_LINKDOWNDEFAULTSTATE);
}

static int recv_subn_get_portinfo(struct ib_smp *smp,
                  struct ib_device *ibdev, u8 port)
{
    struct ipath_ibdev *dev;
    struct ipath_devdata *dd;
    struct ib_port_info *pip = (struct ib_port_info *)smp->data;
    u16 lid;
    u8 ibcstat;
    u8 mtu;
    int ret;

    if (be32_to_cpu(smp->attr_mod) > ibdev->phys_port_cnt) {
        smp->status |= IB_SMP_INVALID_FIELD;
        ret = reply(smp);
        goto bail;
    }

    dev = to_idev(ibdev);
    dd = dev->dd;

    /* 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_SET || dev->mkey == smp->mkey ||
        dev->mkeyprot == 0)
        pip->mkey = dev->mkey;
    pip->gid_prefix = dev->gid_prefix;
    lid = dd->ipath_lid;
    pip->lid = lid ? cpu_to_be16(lid) : IB_LID_PERMISSIVE;
    pip->sm_lid = cpu_to_be16(dev->sm_lid);
    pip->cap_mask = cpu_to_be32(dev->port_cap_flags);
    /* pip->diag_code; */
    pip->mkey_lease_period = cpu_to_be16(dev->mkey_lease_period);
    pip->local_port_num = port;
    pip->link_width_enabled = dd->ipath_link_width_enabled;
    pip->link_width_supported = dd->ipath_link_width_supported;
    pip->link_width_active = dd->ipath_link_width_active;
    pip->linkspeed_portstate = dd->ipath_link_speed_supported << 4;
    ibcstat = dd->ipath_lastibcstat;
    /* map LinkState to IB portinfo values.  */
    pip->linkspeed_portstate |= ipath_ib_linkstate(dd, ibcstat) + 1;

    pip->portphysstate_linkdown =
        (ipath_cvt_physportstate[ibcstat & dd->ibcs_lts_mask] << 4) |
        (get_linkdowndefaultstate(dd) ? 1 : 2);
    pip->mkeyprot_resv_lmc = (dev->mkeyprot << 6) | dd->ipath_lmc;
    pip->linkspeedactive_enabled = (dd->ipath_link_speed_active << 4) |
        dd->ipath_link_speed_enabled;
    switch (dd->ipath_ibmtu) {
    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;
    default:        /* oops, something is wrong */
        mtu = IB_MTU_2048;
        break;
    }
    pip->neighbormtu_mastersmsl = (mtu << 4) | dev->sm_sl;
    pip->vlcap_inittype = 0x10; /* VLCap = VL0, InitType = 0 */
    pip->vl_high_limit = dev->vl_high_limit;
    /* pip->vl_arb_high_cap; // only one VL */
    /* pip->vl_arb_low_cap; // only one VL */
    /* InitTypeReply = 0 */
    /* our mtu cap depends on whether 4K MTU enabled or not */
    pip->inittypereply_mtucap = ipath_mtu4096 ? IB_MTU_4096 : IB_MTU_2048;
    /* HCAs ignore VLStallCount and HOQLife */
    /* pip->vlstallcnt_hoqlife; */
    pip->operationalvl_pei_peo_fpi_fpo = 0x10;  /* OVLs = 1 */
    pip->mkey_violations = cpu_to_be16(dev->mkey_violations);
    /* P_KeyViolations are counted by hardware. */
    pip->pkey_violations =
        cpu_to_be16((ipath_get_cr_errpkey(dd) -
                 dev->z_pkey_violations) & 0xFFFF);
    pip->qkey_violations = cpu_to_be16(dev->qkey_violations);
    /* Only the hardware GUID is supported for now */
    pip->guid_cap = 1;
    pip->clientrereg_resv_subnetto = dev->subnet_timeout;
    /* 32.768 usec. response time (guessing) */
    pip->resv_resptimevalue = 3;
    pip->localphyerrors_overrunerrors =
        (get_phyerrthreshold(dd) << 4) |
        get_overrunthreshold(dd);
    /* pip->max_credit_hint; */
    if (dev->port_cap_flags & IB_PORT_LINK_LATENCY_SUP) {
        u32 v;

        v = dd->ipath_f_get_ib_cfg(dd, IPATH_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;
}

static int get_pkeys(struct ipath_devdata *dd, u16 * pkeys)
{
    /* always a kernel port, no locking needed */
    struct ipath_portdata *pd = dd->ipath_pd[0];

    memcpy(pkeys, pd->port_pkeys, sizeof(pd->port_pkeys));

    return 0;
}

static int recv_subn_get_pkeytable(struct ib_smp *smp,
                   struct ib_device *ibdev)
{
    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 ipath_ibdev *dev = to_idev(ibdev);
        unsigned i, n = ipath_get_npkeys(dev->dd);

        get_pkeys(dev->dd, 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 recv_subn_set_guidinfo(struct ib_smp *smp,
                  struct ib_device *ibdev)
{
    /* The only GUID we support is the first read-only entry. */
    return recv_subn_get_guidinfo(smp, ibdev);
}

static int set_linkdowndefaultstate(struct ipath_devdata *dd, int sleep)
{
    if (sleep)
        dd->ipath_ibcctrl |= INFINIPATH_IBCC_LINKDOWNDEFAULTSTATE;
    else
        dd->ipath_ibcctrl &= ~INFINIPATH_IBCC_LINKDOWNDEFAULTSTATE;
    ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl,
             dd->ipath_ibcctrl);
    return 0;
}

static int recv_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 ipath_ibdev *dev;
    struct ipath_devdata *dd;
    char clientrereg = 0;
    u16 lid, smlid;
    u8 lwe;
    u8 lse;
    u8 state;
    u16 lstate;
    u32 mtu;
    int ret, ore;

    if (be32_to_cpu(smp->attr_mod) > ibdev->phys_port_cnt)
        goto err;

    dev = to_idev(ibdev);
    dd = dev->dd;
    event.device = ibdev;
    event.element.port_num = port;

    dev->mkey = pip->mkey;
    dev->gid_prefix = pip->gid_prefix;
    dev->mkey_lease_period = be16_to_cpu(pip->mkey_lease_period);

    lid = be16_to_cpu(pip->lid);
    if (dd->ipath_lid != lid ||
        dd->ipath_lmc != (pip->mkeyprot_resv_lmc & 7)) {
        /* Must be a valid unicast LID address. */
        if (lid == 0 || lid >= IPATH_MULTICAST_LID_BASE)
            goto err;
        ipath_set_lid(dd, lid, pip->mkeyprot_resv_lmc & 7);
        event.event = IB_EVENT_LID_CHANGE;
        ib_dispatch_event(&event);
    }

    smlid = be16_to_cpu(pip->sm_lid);
    if (smlid != dev->sm_lid) {
        /* Must be a valid unicast LID address. */
        if (smlid == 0 || smlid >= IPATH_MULTICAST_LID_BASE)
            goto err;
        dev->sm_lid = smlid;
        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)
            lwe = dd->ipath_link_width_supported;
        else if (lwe >= 16 || (lwe & ~dd->ipath_link_width_supported))
            goto err;
        set_link_width_enabled(dd, lwe);
    }

    /* Allow 2.5 or 5.0 Gbs. */
    lse = pip->linkspeedactive_enabled & 0xF;
    if (lse) {
        if (lse == 15)
            lse = dd->ipath_link_speed_supported;
        else if (lse >= 8 || (lse & ~dd->ipath_link_speed_supported))
            goto err;
        set_link_speed_enabled(dd, lse);
    }

    /* Set link down default state. */
    switch (pip->portphysstate_linkdown & 0xF) {
    case 0: /* NOP */
        break;
    case 1: /* SLEEP */
        if (set_linkdowndefaultstate(dd, 1))
            goto err;
        break;
    case 2: /* POLL */
        if (set_linkdowndefaultstate(dd, 0))
            goto err;
        break;
    default:
        goto err;
    }

    dev->mkeyprot = pip->mkeyprot_resv_lmc >> 6;
    dev->vl_high_limit = pip->vl_high_limit;

    switch ((pip->neighbormtu_mastersmsl >> 4) & 0xF) {
    case IB_MTU_256:
        mtu = 256;
        break;
    case IB_MTU_512:
        mtu = 512;
        break;
    case IB_MTU_1024:
        mtu = 1024;
        break;
    case IB_MTU_2048:
        mtu = 2048;
        break;
    case IB_MTU_4096:
        if (!ipath_mtu4096)
            goto err;
        mtu = 4096;
        break;
    default:
        /* XXX We have already partially updated our state! */
        goto err;
    }
    ipath_set_mtu(dd, mtu);

    dev->sm_sl = pip->neighbormtu_mastersmsl & 0xF;

    /* We only support VL0 */
    if (((pip->operationalvl_pei_peo_fpi_fpo >> 4) & 0xF) > 1)
        goto err;

    if (pip->mkey_violations == 0)
        dev->mkey_violations = 0;

    /*
     * Hardware counter can't be reset so snapshot and subtract
     * later.
     */
    if (pip->pkey_violations == 0)
        dev->z_pkey_violations = ipath_get_cr_errpkey(dd);

    if (pip->qkey_violations == 0)
        dev->qkey_violations = 0;

    ore = pip->localphyerrors_overrunerrors;
    if (set_phyerrthreshold(dd, (ore >> 4) & 0xF))
        goto err;

    if (set_overrunthreshold(dd, (ore & 0xF)))
        goto err;

    dev->subnet_timeout = pip->clientrereg_resv_subnetto & 0x1F;

    if (pip->clientrereg_resv_subnetto & 0x80) {
        clientrereg = 1;
        event.event = IB_EVENT_CLIENT_REREGISTER;
        ib_dispatch_event(&event);
    }

    /*
     * 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))
        goto err;

    /*
     * 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 = IPATH_IB_LINKDOWN_ONLY;
        else if (lstate == 1)
            lstate = IPATH_IB_LINKDOWN_SLEEP;
        else if (lstate == 2)
            lstate = IPATH_IB_LINKDOWN;
        else if (lstate == 3)
            lstate = IPATH_IB_LINKDOWN_DISABLE;
        else
            goto err;
        ipath_set_linkstate(dd, lstate);
        if (lstate == IPATH_IB_LINKDOWN_DISABLE) {
            ret = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
            goto done;
        }
        ipath_wait_linkstate(dd, IPATH_LINKINIT | IPATH_LINKARMED |
                IPATH_LINKACTIVE, 1000);
        break;
    case IB_PORT_ARMED:
        ipath_set_linkstate(dd, IPATH_IB_LINKARM);
        break;
    case IB_PORT_ACTIVE:
        ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE);
        break;
    default:
        /* XXX We have already partially updated our state! */
        goto err;
    }

    ret = recv_subn_get_portinfo(smp, ibdev, port);

    if (clientrereg)
        pip->clientrereg_resv_subnetto |= 0x80;

    goto done;

err:
    smp->status |= IB_SMP_INVALID_FIELD;
    ret = recv_subn_get_portinfo(smp, ibdev, port);

done:
    return ret;
}

static int rm_pkey(struct ipath_devdata *dd, u16 key)
{
    int i;
    int ret;

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

    ret = 0;

bail:
    return ret;
}

static int add_pkey(struct ipath_devdata *dd, 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(dd->ipath_pkeys); i++) {
        if (!dd->ipath_pkeys[i]) {
            any++;
            continue;
        }
        /* If it matches exactly, try to increment the ref count */
        if (dd->ipath_pkeys[i] == key) {
            if (atomic_inc_return(&dd->ipath_pkeyrefs[i]) > 1) {
                ret = 0;
                goto bail;
            }
            /* Lost the race. Look for an empty slot below. */
            atomic_dec(&dd->ipath_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 ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) {
            ret = -EEXIST;
            goto bail;
        }
    }
    if (!any) {
        ret = -EBUSY;
        goto bail;
    }
    for (i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) {
        if (!dd->ipath_pkeys[i] &&
            atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) {
            /* for ipathstats, etc. */
            ipath_stats.sps_pkeys[i] = lkey;
            dd->ipath_pkeys[i] = key;
            ret = 1;
            goto bail;
        }
    }
    ret = -EBUSY;

bail:
    return ret;
}

static int set_pkeys(struct ipath_devdata *dd, u16 *pkeys)
{
    struct ipath_portdata *pd;
    int i;
    int changed = 0;

    /* always a kernel port, no locking needed */
    pd = dd->ipath_pd[0];

    for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) {
        u16 key = pkeys[i];
        u16 okey = pd->port_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(dd, okey);
        if (key & 0x7FFF) {
            int ret = add_pkey(dd, key);

            if (ret < 0)
                key = 0;
            else
                changed |= ret;
        }
        pd->port_pkeys[i] = key;
    }
    if (changed) {
        u64 pkey;

        pkey = (u64) dd->ipath_pkeys[0] |
            ((u64) dd->ipath_pkeys[1] << 16) |
            ((u64) dd->ipath_pkeys[2] << 32) |
            ((u64) dd->ipath_pkeys[3] << 48);
        ipath_cdbg(VERBOSE, "p0 new pkey reg %llx\n",
               (unsigned long long) pkey);
        ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey,
                 pkey);
    }
    return 0;
}

static int recv_subn_set_pkeytable(struct ib_smp *smp,
                   struct ib_device *ibdev)
{
    u32 startpx = 32 * (be32_to_cpu(smp->attr_mod) & 0xffff);
    __be16 *p = (__be16 *) smp->data;
    u16 *q = (u16 *) smp->data;
    struct ipath_ibdev *dev = to_idev(ibdev);
    unsigned i, n = ipath_get_npkeys(dev->dd);

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

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

    return recv_subn_get_pkeytable(smp, ibdev);
}

static int recv_pma_get_classportinfo(struct ib_pma_mad *pmp)
{
    struct ib_class_port_info *p =
        (struct ib_class_port_info *)pmp->data;

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

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

    /* Indicate AllPortSelect is valid (only one port anyway) */
    p->capability_mask = cpu_to_be16(1 << 8);
    p->base_version = 1;
    p->class_version = 1;
    /*
     * Expected response time is 4.096 usec. * 2^18 == 1.073741824
     * sec.
     */
    p->resp_time_value = 18;

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

/*
 * The PortSamplesControl.CounterMasks field is an array of 3 bit fields
 * which specify the N'th counter's capabilities. See ch. 16.1.3.2.
 * We support 5 counters which only count the mandatory quantities.
 */
#define COUNTER_MASK(q, n) (q << ((9 - n) * 3))
#define COUNTER_MASK0_9 cpu_to_be32(COUNTER_MASK(1, 0) | \
                    COUNTER_MASK(1, 1) | \
                    COUNTER_MASK(1, 2) | \
                    COUNTER_MASK(1, 3) | \
                    COUNTER_MASK(1, 4))

static int recv_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 ipath_ibdev *dev = to_idev(ibdev);
    struct ipath_cregs const *crp = dev->dd->ipath_cregs;
    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 && port_select != 0xFF))
        pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
    /*
     * Ticks are 10x the link transfer period which for 2.5Gbs is 4
     * nsec.  0 == 4 nsec., 1 == 8 nsec., ..., 255 == 1020 nsec.  Sample
     * intervals are counted in ticks.  Since we use Linux timers, that
     * count in jiffies, we can't sample for less than 1000 ticks if HZ
     * == 1000 (4000 ticks if HZ is 250).  link_speed_active returns 2 for
     * DDR, 1 for SDR, set the tick to 1 for DDR, 0 for SDR on chips that
     * have hardware support for delaying packets.
     */
    if (crp->cr_psstat)
        p->tick = dev->dd->ipath_link_speed_active - 1;
    else
        p->tick = 250;      /* 1 usec. */
    p->counter_width = 4;   /* 32 bit counters */
    p->counter_mask0_9 = COUNTER_MASK0_9;
    spin_lock_irqsave(&dev->pending_lock, flags);
    if (crp->cr_psstat)
        p->sample_status = ipath_read_creg32(dev->dd, crp->cr_psstat);
    else
        p->sample_status = dev->pma_sample_status;
    p->sample_start = cpu_to_be32(dev->pma_sample_start);
    p->sample_interval = cpu_to_be32(dev->pma_sample_interval);
    p->tag = cpu_to_be16(dev->pma_tag);
    p->counter_select[0] = dev->pma_counter_select[0];
    p->counter_select[1] = dev->pma_counter_select[1];
    p->counter_select[2] = dev->pma_counter_select[2];
    p->counter_select[3] = dev->pma_counter_select[3];
    p->counter_select[4] = dev->pma_counter_select[4];
    spin_unlock_irqrestore(&dev->pending_lock, flags);

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

static int recv_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 ipath_ibdev *dev = to_idev(ibdev);
    struct ipath_cregs const *crp = dev->dd->ipath_cregs;
    unsigned long flags;
    u8 status;
    int ret;

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

    spin_lock_irqsave(&dev->pending_lock, flags);
    if (crp->cr_psstat)
        status = ipath_read_creg32(dev->dd, crp->cr_psstat);
    else
        status = dev->pma_sample_status;
    if (status == IB_PMA_SAMPLE_STATUS_DONE) {
        dev->pma_sample_start = be32_to_cpu(p->sample_start);
        dev->pma_sample_interval = be32_to_cpu(p->sample_interval);
        dev->pma_tag = be16_to_cpu(p->tag);
        dev->pma_counter_select[0] = p->counter_select[0];
        dev->pma_counter_select[1] = p->counter_select[1];
        dev->pma_counter_select[2] = p->counter_select[2];
        dev->pma_counter_select[3] = p->counter_select[3];
        dev->pma_counter_select[4] = p->counter_select[4];
        if (crp->cr_psstat) {
            ipath_write_creg(dev->dd, crp->cr_psinterval,
                     dev->pma_sample_interval);
            ipath_write_creg(dev->dd, crp->cr_psstart,
                     dev->pma_sample_start);
        } else
            dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_STARTED;
    }
    spin_unlock_irqrestore(&dev->pending_lock, flags);

    ret = recv_pma_get_portsamplescontrol(pmp, ibdev, port);

bail:
    return ret;
}

static u64 get_counter(struct ipath_ibdev *dev,
               struct ipath_cregs const *crp,
               __be16 sel)
{
    u64 ret;

    switch (sel) {
    case IB_PMA_PORT_XMIT_DATA:
        ret = (crp->cr_psxmitdatacount) ?
            ipath_read_creg32(dev->dd, crp->cr_psxmitdatacount) :
            dev->ipath_sword;
        break;
    case IB_PMA_PORT_RCV_DATA:
        ret = (crp->cr_psrcvdatacount) ?
            ipath_read_creg32(dev->dd, crp->cr_psrcvdatacount) :
            dev->ipath_rword;
        break;
    case IB_PMA_PORT_XMIT_PKTS:
        ret = (crp->cr_psxmitpktscount) ?
            ipath_read_creg32(dev->dd, crp->cr_psxmitpktscount) :
            dev->ipath_spkts;
        break;
    case IB_PMA_PORT_RCV_PKTS:
        ret = (crp->cr_psrcvpktscount) ?
            ipath_read_creg32(dev->dd, crp->cr_psrcvpktscount) :
            dev->ipath_rpkts;
        break;
    case IB_PMA_PORT_XMIT_WAIT:
        ret = (crp->cr_psxmitwaitcount) ?
            ipath_read_creg32(dev->dd, crp->cr_psxmitwaitcount) :
            dev->ipath_xmit_wait;
        break;
    default:
        ret = 0;
    }

    return ret;
}

static int recv_pma_get_portsamplesresult(struct ib_pma_mad *pmp,
                      struct ib_device *ibdev)
{
    struct ib_pma_portsamplesresult *p =
        (struct ib_pma_portsamplesresult *)pmp->data;
    struct ipath_ibdev *dev = to_idev(ibdev);
    struct ipath_cregs const *crp = dev->dd->ipath_cregs;
    u8 status;
    int i;

    memset(pmp->data, 0, sizeof(pmp->data));
    p->tag = cpu_to_be16(dev->pma_tag);
    if (crp->cr_psstat)
        status = ipath_read_creg32(dev->dd, crp->cr_psstat);
    else
        status = dev->pma_sample_status;
    p->sample_status = cpu_to_be16(status);
    for (i = 0; i < ARRAY_SIZE(dev->pma_counter_select); i++)
        p->counter[i] = (status != IB_PMA_SAMPLE_STATUS_DONE) ? 0 :
            cpu_to_be32(
            get_counter(dev, crp, dev->pma_counter_select[i]));

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

static int recv_pma_get_portsamplesresult_ext(struct ib_pma_mad *pmp,
                          struct ib_device *ibdev)
{
    struct ib_pma_portsamplesresult_ext *p =
        (struct ib_pma_portsamplesresult_ext *)pmp->data;
    struct ipath_ibdev *dev = to_idev(ibdev);
    struct ipath_cregs const *crp = dev->dd->ipath_cregs;
    u8 status;
    int i;

    memset(pmp->data, 0, sizeof(pmp->data));
    p->tag = cpu_to_be16(dev->pma_tag);
    if (crp->cr_psstat)
        status = ipath_read_creg32(dev->dd, crp->cr_psstat);
    else
        status = dev->pma_sample_status;
    p->sample_status = cpu_to_be16(status);
    /* 64 bits */
    p->extended_width = cpu_to_be32(0x80000000);
    for (i = 0; i < ARRAY_SIZE(dev->pma_counter_select); i++)
        p->counter[i] = (status != IB_PMA_SAMPLE_STATUS_DONE) ? 0 :
            cpu_to_be64(
            get_counter(dev, crp, dev->pma_counter_select[i]));

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

static int recv_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 ipath_ibdev *dev = to_idev(ibdev);
    struct ipath_verbs_counters cntrs;
    u8 port_select = p->port_select;

    ipath_get_counters(dev->dd, &cntrs);

    /* Adjust counters for any resets done. */
    cntrs.symbol_error_counter -= dev->z_symbol_error_counter;
    cntrs.link_error_recovery_counter -=
        dev->z_link_error_recovery_counter;
    cntrs.link_downed_counter -= dev->z_link_downed_counter;
    cntrs.port_rcv_errors += dev->rcv_errors;
    cntrs.port_rcv_errors -= dev->z_port_rcv_errors;
    cntrs.port_rcv_remphys_errors -= dev->z_port_rcv_remphys_errors;
    cntrs.port_xmit_discards -= dev->z_port_xmit_discards;
    cntrs.port_xmit_data -= dev->z_port_xmit_data;
    cntrs.port_rcv_data -= dev->z_port_rcv_data;
    cntrs.port_xmit_packets -= dev->z_port_xmit_packets;
    cntrs.port_rcv_packets -= dev->z_port_rcv_packets;
    cntrs.local_link_integrity_errors -=
        dev->z_local_link_integrity_errors;
    cntrs.excessive_buffer_overrun_errors -=
        dev->z_excessive_buffer_overrun_errors;
    cntrs.vl15_dropped -= dev->z_vl15_dropped;
    cntrs.vl15_dropped += dev->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 && port_select != 0xFF))
        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 recv_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 ipath_ibdev *dev = to_idev(ibdev);
    u64 swords, rwords, spkts, rpkts, xwait;
    u8 port_select = p->port_select;

    ipath_snapshot_counters(dev->dd, &swords, &rwords, &spkts,
                &rpkts, &xwait);

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

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

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

    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);
    p->port_unicast_xmit_packets = cpu_to_be64(dev->n_unicast_xmit);
    p->port_unicast_rcv_packets = cpu_to_be64(dev->n_unicast_rcv);
    p->port_multicast_xmit_packets = cpu_to_be64(dev->n_multicast_xmit);
    p->port_multicast_rcv_packets = cpu_to_be64(dev->n_multicast_rcv);

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

static int recv_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 ipath_ibdev *dev = to_idev(ibdev);
    struct ipath_verbs_counters cntrs;

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

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

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

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

    if (p->counter_select & IB_PMA_SEL_PORT_RCV_ERRORS)
        dev->z_port_rcv_errors =
            cntrs.port_rcv_errors + dev->rcv_errors;

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

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

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

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

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

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

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

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

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

    return recv_pma_get_portcounters(pmp, ibdev, port);
}

static int recv_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 ipath_ibdev *dev = to_idev(ibdev);
    u64 swords, rwords, spkts, rpkts, xwait;

    ipath_snapshot_counters(dev->dd, &swords, &rwords, &spkts,
                &rpkts, &xwait);

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

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

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

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

    if (p->counter_select & IB_PMA_SELX_PORT_UNI_XMIT_PACKETS)
        dev->n_unicast_xmit = 0;

    if (p->counter_select & IB_PMA_SELX_PORT_UNI_RCV_PACKETS)
        dev->n_unicast_rcv = 0;

    if (p->counter_select & IB_PMA_SELX_PORT_MULTI_XMIT_PACKETS)
        dev->n_multicast_xmit = 0;

    if (p->counter_select & IB_PMA_SELX_PORT_MULTI_RCV_PACKETS)
        dev->n_multicast_rcv = 0;

    return recv_pma_get_portcounters_ext(pmp, ibdev, port);
}

static int process_subn(struct ib_device *ibdev, int mad_flags,
            u8 port_num, struct ib_mad *in_mad,
            struct ib_mad *out_mad)
{
    struct ib_smp *smp = (struct ib_smp *)out_mad;
    struct ipath_ibdev *dev = to_idev(ibdev);
    int ret;

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

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

    /*
     * M_Key checking depends on
     * Portinfo:M_Key_protect_bits
     */
    if ((mad_flags & IB_MAD_IGNORE_MKEY) == 0 && dev->mkey != 0 &&
        dev->mkey != smp->mkey &&
        (smp->method == IB_MGMT_METHOD_SET ||
         (smp->method == IB_MGMT_METHOD_GET &&
          dev->mkeyprot >= 2))) {
        if (dev->mkey_violations != 0xFFFF)
            ++dev->mkey_violations;
        if (dev->mkey_lease_timeout ||
            dev->mkey_lease_period == 0) {
            ret = IB_MAD_RESULT_SUCCESS |
                IB_MAD_RESULT_CONSUMED;
            goto bail;
        }
        dev->mkey_lease_timeout = jiffies +
            dev->mkey_lease_period * HZ;
        /* Future: Generate a trap notice. */
        ret = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
        goto bail;
    } else if (dev->mkey_lease_timeout)
        dev->mkey_lease_timeout = 0;

    switch (smp->method) {
    case IB_MGMT_METHOD_GET:
        switch (smp->attr_id) {
        case IB_SMP_ATTR_NODE_DESC:
            ret = recv_subn_get_nodedescription(smp, ibdev);
            goto bail;
        case IB_SMP_ATTR_NODE_INFO:
            ret = recv_subn_get_nodeinfo(smp, ibdev, port_num);
            goto bail;
        case IB_SMP_ATTR_GUID_INFO:
            ret = recv_subn_get_guidinfo(smp, ibdev);
            goto bail;
        case IB_SMP_ATTR_PORT_INFO:
            ret = recv_subn_get_portinfo(smp, ibdev, port_num);
            goto bail;
        case IB_SMP_ATTR_PKEY_TABLE:
            ret = recv_subn_get_pkeytable(smp, ibdev);
            goto bail;
        case IB_SMP_ATTR_SM_INFO:
            if (dev->port_cap_flags & IB_PORT_SM_DISABLED) {
                ret = IB_MAD_RESULT_SUCCESS |
                    IB_MAD_RESULT_CONSUMED;
                goto bail;
            }
            if (dev->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 = recv_subn_set_guidinfo(smp, ibdev);
            goto bail;
        case IB_SMP_ATTR_PORT_INFO:
            ret = recv_subn_set_portinfo(smp, ibdev, port_num);
            goto bail;
        case IB_SMP_ATTR_PKEY_TABLE:
            ret = recv_subn_set_pkeytable(smp, ibdev);
            goto bail;
        case IB_SMP_ATTR_SM_INFO:
            if (dev->port_cap_flags & IB_PORT_SM_DISABLED) {
                ret = IB_MAD_RESULT_SUCCESS |
                    IB_MAD_RESULT_CONSUMED;
                goto bail;
            }
            if (dev->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:
    case IB_MGMT_METHOD_REPORT:
    case IB_MGMT_METHOD_REPORT_RESP:
    case IB_MGMT_METHOD_TRAP_REPRESS:
    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:
        smp->status |= IB_SMP_UNSUP_METHOD;
        ret = reply(smp);
    }

bail:
    return ret;
}

static int process_perf(struct ib_device *ibdev, u8 port_num,
            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 = recv_pma_get_classportinfo(pmp);
            goto bail;
        case IB_PMA_PORT_SAMPLES_CONTROL:
            ret = recv_pma_get_portsamplescontrol(pmp, ibdev,
                                  port_num);
            goto bail;
        case IB_PMA_PORT_SAMPLES_RESULT:
            ret = recv_pma_get_portsamplesresult(pmp, ibdev);
            goto bail;
        case IB_PMA_PORT_SAMPLES_RESULT_EXT:
            ret = recv_pma_get_portsamplesresult_ext(pmp,
                                 ibdev);
            goto bail;
        case IB_PMA_PORT_COUNTERS:
            ret = recv_pma_get_portcounters(pmp, ibdev,
                            port_num);
            goto bail;
        case IB_PMA_PORT_COUNTERS_EXT:
            ret = recv_pma_get_portcounters_ext(pmp, ibdev,
                                port_num);
            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 = recv_pma_set_portsamplescontrol(pmp, ibdev,
                                  port_num);
            goto bail;
        case IB_PMA_PORT_COUNTERS:
            ret = recv_pma_set_portcounters(pmp, ibdev,
                            port_num);
            goto bail;
        case IB_PMA_PORT_COUNTERS_EXT:
            ret = recv_pma_set_portcounters_ext(pmp, ibdev,
                                port_num);
            goto bail;
        default:
            pmp->mad_hdr.status |= IB_SMP_UNSUP_METH_ATTR;
            ret = reply((struct ib_smp *) pmp);
            goto bail;
        }

    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;
}

int ipath_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
              struct ib_wc *in_wc, struct ib_grh *in_grh,
              struct ib_mad *in_mad, struct ib_mad *out_mad)
{
    int ret;

    switch (in_mad->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_num,
                   in_mad, out_mad);
        goto bail;
    case IB_MGMT_CLASS_PERF_MGMT:
        ret = process_perf(ibdev, port_num, in_mad, out_mad);
        goto bail;
    default:
        ret = IB_MAD_RESULT_SUCCESS;
    }

bail:
    return ret;
}