/*
 * Copyright(c) 2015-2018 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * 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.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/net.h>
#include <rdma/opa_addr.h>
#define OPA_NUM_PKEY_BLOCKS_PER_SMP (OPA_SMP_DR_DATA_SIZE \
                        / (OPA_PARTITION_TABLE_BLK_SIZE * sizeof(u16)))

#include "hfi.h"
#include "mad.h"
#include "trace.h"
#include "qp.h"
#include "vnic.h"

/* the reset value from the FM is supposed to be 0xffff, handle both */
#define OPA_LINK_WIDTH_RESET_OLD 0x0fff
#define OPA_LINK_WIDTH_RESET 0xffff

struct trap_node {
        struct list_head list;
        struct opa_mad_notice_attr data;
        __be64 tid;
        int len;
        u32 retry;
        u8 in_use;
        u8 repress;
};

static int smp_length_check(u32 data_size, u32 request_len)
{
        if (unlikely(request_len < data_size))
                return -EINVAL;

        return 0;
}

static int reply(struct ib_mad_hdr *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 inline void clear_opa_smp_data(struct opa_smp *smp)
{
        void *data = opa_get_smp_data(smp);
        size_t size = opa_get_smp_data_size(smp);

        memset(data, 0, size);
}

static u16 hfi1_lookup_pkey_value(struct hfi1_ibport *ibp, int pkey_idx)
{
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);

        if (pkey_idx < ARRAY_SIZE(ppd->pkeys))
                return ppd->pkeys[pkey_idx];

        return 0;
}

void hfi1_event_pkey_change(struct hfi1_devdata *dd, u8 port)
{
        struct ib_event event;

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

/*
 * If the port is down, clean up all pending traps.  We need to be careful
 * with the given trap, because it may be queued.
 */
static void cleanup_traps(struct hfi1_ibport *ibp, struct trap_node *trap)
{
        struct trap_node *node, *q;
        unsigned long flags;
        struct list_head trap_list;
        int i;

        for (i = 0; i < RVT_MAX_TRAP_LISTS; i++) {
                spin_lock_irqsave(&ibp->rvp.lock, flags);
                list_replace_init(&ibp->rvp.trap_lists[i].list, &trap_list);
                ibp->rvp.trap_lists[i].list_len = 0;
                spin_unlock_irqrestore(&ibp->rvp.lock, flags);

                /*
                 * Remove all items from the list, freeing all the non-given
                 * traps.
                 */
                list_for_each_entry_safe(node, q, &trap_list, list) {
                        list_del(&node->list);
                        if (node != trap)
                                kfree(node);
                }
        }

        /*
         * If this wasn't on one of the lists it would not be freed.  If it
         * was on the list, it is now safe to free.
         */
        kfree(trap);
}

static struct trap_node *check_and_add_trap(struct hfi1_ibport *ibp,
                                            struct trap_node *trap)
{
        struct trap_node *node;
        struct trap_list *trap_list;
        unsigned long flags;
        unsigned long timeout;
        int found = 0;
        unsigned int queue_id;
        static int trap_count;

        queue_id = trap->data.generic_type & 0x0F;
        if (queue_id >= RVT_MAX_TRAP_LISTS) {
                trap_count++;
                pr_err_ratelimited("hfi1: Invalid trap 0x%0x dropped. Total dropped: %d\n",
                                   trap->data.generic_type, trap_count);
                kfree(trap);
                return NULL;
        }

        /*
         * Since the retry (handle timeout) does not remove a trap request
         * from the list, all we have to do is compare the node.
         */
        spin_lock_irqsave(&ibp->rvp.lock, flags);
        trap_list = &ibp->rvp.trap_lists[queue_id];

        list_for_each_entry(node, &trap_list->list, list) {
                if (node == trap) {
                        node->retry++;
                        found = 1;
                        break;
                }
        }

        /* If it is not on the list, add it, limited to RVT-MAX_TRAP_LEN. */
        if (!found) {
                if (trap_list->list_len < RVT_MAX_TRAP_LEN) {
                        trap_list->list_len++;
                        list_add_tail(&trap->list, &trap_list->list);
                } else {
                        pr_warn_ratelimited("hfi1: Maximum trap limit reached for 0x%0x traps\n",
                                            trap->data.generic_type);
                        kfree(trap);
                }
        }

        /*
         * Next check to see if there is a timer pending.  If not, set it up
         * and get the first trap from the list.
         */
        node = NULL;
        if (!timer_pending(&ibp->rvp.trap_timer)) {
                /*
                 * o14-2
                 * If the time out is set we have to wait until it expires
                 * before the trap can be sent.
                 * This should be > RVT_TRAP_TIMEOUT
                 */
                timeout = (RVT_TRAP_TIMEOUT *
                           (1UL << ibp->rvp.subnet_timeout)) / 1000;
                mod_timer(&ibp->rvp.trap_timer,
                          jiffies + usecs_to_jiffies(timeout));
                node = list_first_entry(&trap_list->list, struct trap_node,
                                        list);
                node->in_use = 1;
        }
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        return node;
}

static void subn_handle_opa_trap_repress(struct hfi1_ibport *ibp,
                                         struct opa_smp *smp)
{
        struct trap_list *trap_list;
        struct trap_node *trap;
        unsigned long flags;
        int i;

        if (smp->attr_id != IB_SMP_ATTR_NOTICE)
                return;

        spin_lock_irqsave(&ibp->rvp.lock, flags);
        for (i = 0; i < RVT_MAX_TRAP_LISTS; i++) {
                trap_list = &ibp->rvp.trap_lists[i];
                trap = list_first_entry_or_null(&trap_list->list,
                                                struct trap_node, list);
                if (trap && trap->tid == smp->tid) {
                        if (trap->in_use) {
                                trap->repress = 1;
                        } else {
                                trap_list->list_len--;
                                list_del(&trap->list);
                                kfree(trap);
                        }
                        break;
                }
        }
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);
}

static void hfi1_update_sm_ah_attr(struct hfi1_ibport *ibp,
                                   struct rdma_ah_attr *attr, u32 dlid)
{
        rdma_ah_set_dlid(attr, dlid);
        rdma_ah_set_port_num(attr, ppd_from_ibp(ibp)->port);
        if (dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) {
                struct ib_global_route *grh = rdma_ah_retrieve_grh(attr);

                rdma_ah_set_ah_flags(attr, IB_AH_GRH);
                grh->sgid_index = 0;
                grh->hop_limit = 1;
                grh->dgid.global.subnet_prefix =
                        ibp->rvp.gid_prefix;
                grh->dgid.global.interface_id = OPA_MAKE_ID(dlid);
        }
}

static int hfi1_modify_qp0_ah(struct hfi1_ibport *ibp,
                              struct rvt_ah *ah, u32 dlid)
{
        struct rdma_ah_attr attr;
        struct rvt_qp *qp0;
        int ret = -EINVAL;

        memset(&attr, 0, sizeof(attr));
        attr.type = ah->ibah.type;
        hfi1_update_sm_ah_attr(ibp, &attr, dlid);
        rcu_read_lock();
        qp0 = rcu_dereference(ibp->rvp.qp[0]);
        if (qp0)
                ret = rdma_modify_ah(&ah->ibah, &attr);
        rcu_read_unlock();
        return ret;
}

static struct ib_ah *hfi1_create_qp0_ah(struct hfi1_ibport *ibp, u32 dlid)
{
        struct rdma_ah_attr attr;
        struct ib_ah *ah = ERR_PTR(-EINVAL);
        struct rvt_qp *qp0;
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
        struct hfi1_devdata *dd = dd_from_ppd(ppd);
        u8 port_num = ppd->port;

        memset(&attr, 0, sizeof(attr));
        attr.type = rdma_ah_find_type(&dd->verbs_dev.rdi.ibdev, port_num);
        hfi1_update_sm_ah_attr(ibp, &attr, dlid);
        rcu_read_lock();
        qp0 = rcu_dereference(ibp->rvp.qp[0]);
        if (qp0)
                ah = rdma_create_ah(qp0->ibqp.pd, &attr, 0);
        rcu_read_unlock();
        return ah;
}

static void send_trap(struct hfi1_ibport *ibp, struct trap_node *trap)
{
        struct ib_mad_send_buf *send_buf;
        struct ib_mad_agent *agent;
        struct opa_smp *smp;
        unsigned long flags;
        int pkey_idx;
        u32 qpn = ppd_from_ibp(ibp)->sm_trap_qp;

        agent = ibp->rvp.send_agent;
        if (!agent) {
                cleanup_traps(ibp, trap);
                return;
        }

        /* o14-3.2.1 */
        if (driver_lstate(ppd_from_ibp(ibp)) != IB_PORT_ACTIVE) {
                cleanup_traps(ibp, trap);
                return;
        }

        /* Add the trap to the list if necessary and see if we can send it */
        trap = check_and_add_trap(ibp, trap);
        if (!trap)
                return;

        pkey_idx = hfi1_lookup_pkey_idx(ibp, LIM_MGMT_P_KEY);
        if (pkey_idx < 0) {
                pr_warn("%s: failed to find limited mgmt pkey, defaulting 0x%x\n",
                        __func__, hfi1_get_pkey(ibp, 1));
                pkey_idx = 1;
        }

        send_buf = ib_create_send_mad(agent, qpn, pkey_idx, 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 = OPA_MGMT_BASE_VERSION;
        smp->mgmt_class = IB_MGMT_CLASS_SUBN_LID_ROUTED;
        smp->class_version = OPA_SM_CLASS_VERSION;
        smp->method = IB_MGMT_METHOD_TRAP;

        /* Only update the transaction ID for new traps (o13-5). */
        if (trap->tid == 0) {
                ibp->rvp.tid++;
                /* make sure that tid != 0 */
                if (ibp->rvp.tid == 0)
                        ibp->rvp.tid++;
                trap->tid = cpu_to_be64(ibp->rvp.tid);
        }
        smp->tid = trap->tid;

        smp->attr_id = IB_SMP_ATTR_NOTICE;
        /* o14-1: smp->mkey = 0; */

        memcpy(smp->route.lid.data, &trap->data, trap->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 = hfi1_create_qp0_ah(ibp, ibp->rvp.sm_lid);
                        if (IS_ERR(ah)) {
                                spin_unlock_irqrestore(&ibp->rvp.lock, flags);
                                return;
                        }
                        send_buf->ah = ah;
                        ibp->rvp.sm_ah = ibah_to_rvtah(ah);
                } else {
                        spin_unlock_irqrestore(&ibp->rvp.lock, flags);
                        return;
                }
        } else {
                send_buf->ah = &ibp->rvp.sm_ah->ibah;
        }

        /*
         * If the trap was repressed while things were getting set up, don't
         * bother sending it. This could happen for a retry.
         */
        if (trap->repress) {
                list_del(&trap->list);
                spin_unlock_irqrestore(&ibp->rvp.lock, flags);
                kfree(trap);
                ib_free_send_mad(send_buf);
                return;
        }

        trap->in_use = 0;
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        if (ib_post_send_mad(send_buf, NULL))
                ib_free_send_mad(send_buf);
}

void hfi1_handle_trap_timer(struct timer_list *t)
{
        struct hfi1_ibport *ibp = from_timer(ibp, t, rvp.trap_timer);
        struct trap_node *trap = NULL;
        unsigned long flags;
        int i;

        /* Find the trap with the highest priority */
        spin_lock_irqsave(&ibp->rvp.lock, flags);
        for (i = 0; !trap && i < RVT_MAX_TRAP_LISTS; i++) {
                trap = list_first_entry_or_null(&ibp->rvp.trap_lists[i].list,
                                                struct trap_node, list);
        }
        spin_unlock_irqrestore(&ibp->rvp.lock, flags);

        if (trap)
                send_trap(ibp, trap);
}

static struct trap_node *create_trap_node(u8 type, __be16 trap_num, u32 lid)
{
        struct trap_node *trap;

        trap = kzalloc(sizeof(*trap), GFP_ATOMIC);
        if (!trap)
                return NULL;

        INIT_LIST_HEAD(&trap->list);
        trap->data.generic_type = type;
        trap->data.prod_type_lsb = IB_NOTICE_PROD_CA;
        trap->data.trap_num = trap_num;
        trap->data.issuer_lid = cpu_to_be32(lid);

        return trap;
}

/*
 * Send a bad P_Key trap (ch. 14.3.8).
 */
void hfi1_bad_pkey(struct hfi1_ibport *ibp, u32 key, u32 sl,
                   u32 qp1, u32 qp2, u32 lid1, u32 lid2)
{
        struct trap_node *trap;
        u32 lid = ppd_from_ibp(ibp)->lid;

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

        trap = create_trap_node(IB_NOTICE_TYPE_SECURITY, OPA_TRAP_BAD_P_KEY,
                                lid);
        if (!trap)
                return;

        /* Send violation trap */
        trap->data.ntc_257_258.lid1 = cpu_to_be32(lid1);
        trap->data.ntc_257_258.lid2 = cpu_to_be32(lid2);
        trap->data.ntc_257_258.key = cpu_to_be32(key);
        trap->data.ntc_257_258.sl = sl << 3;
        trap->data.ntc_257_258.qp1 = cpu_to_be32(qp1);
        trap->data.ntc_257_258.qp2 = cpu_to_be32(qp2);

        trap->len = sizeof(trap->data);
        send_trap(ibp, trap);
}

/*
 * Send a bad M_Key trap (ch. 14.3.9).
 */
static void bad_mkey(struct hfi1_ibport *ibp, struct ib_mad_hdr *mad,
                     __be64 mkey, __be32 dr_slid, u8 return_path[], u8 hop_cnt)
{
        struct trap_node *trap;
        u32 lid = ppd_from_ibp(ibp)->lid;

        trap = create_trap_node(IB_NOTICE_TYPE_SECURITY, OPA_TRAP_BAD_M_KEY,
                                lid);
        if (!trap)
                return;

        /* Send violation trap */
        trap->data.ntc_256.lid = trap->data.issuer_lid;
        trap->data.ntc_256.method = mad->method;
        trap->data.ntc_256.attr_id = mad->attr_id;
        trap->data.ntc_256.attr_mod = mad->attr_mod;
        trap->data.ntc_256.mkey = mkey;
        if (mad->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
                trap->data.ntc_256.dr_slid = dr_slid;
                trap->data.ntc_256.dr_trunc_hop = IB_NOTICE_TRAP_DR_NOTICE;
                if (hop_cnt > ARRAY_SIZE(trap->data.ntc_256.dr_rtn_path)) {
                        trap->data.ntc_256.dr_trunc_hop |=
                                IB_NOTICE_TRAP_DR_TRUNC;
                        hop_cnt = ARRAY_SIZE(trap->data.ntc_256.dr_rtn_path);
                }
                trap->data.ntc_256.dr_trunc_hop |= hop_cnt;
                memcpy(trap->data.ntc_256.dr_rtn_path, return_path,
                       hop_cnt);
        }

        trap->len = sizeof(trap->data);

        send_trap(ibp, trap);
}

/*
 * Send a Port Capability Mask Changed trap (ch. 14.3.11).
 */
void hfi1_cap_mask_chg(struct rvt_dev_info *rdi, u8 port_num)
{
        struct trap_node *trap;
        struct hfi1_ibdev *verbs_dev = dev_from_rdi(rdi);
        struct hfi1_devdata *dd = dd_from_dev(verbs_dev);
        struct hfi1_ibport *ibp = &dd->pport[port_num - 1].ibport_data;
        u32 lid = ppd_from_ibp(ibp)->lid;

        trap = create_trap_node(IB_NOTICE_TYPE_INFO,
                                OPA_TRAP_CHANGE_CAPABILITY,
                                lid);
        if (!trap)
                return;

        trap->data.ntc_144.lid = trap->data.issuer_lid;
        trap->data.ntc_144.new_cap_mask = cpu_to_be32(ibp->rvp.port_cap_flags);
        trap->data.ntc_144.cap_mask3 = cpu_to_be16(ibp->rvp.port_cap3_flags);

        trap->len = sizeof(trap->data);
        send_trap(ibp, trap);
}

/*
 * Send a System Image GUID Changed trap (ch. 14.3.12).
 */
void hfi1_sys_guid_chg(struct hfi1_ibport *ibp)
{
        struct trap_node *trap;
        u32 lid = ppd_from_ibp(ibp)->lid;

        trap = create_trap_node(IB_NOTICE_TYPE_INFO, OPA_TRAP_CHANGE_SYSGUID,
                                lid);
        if (!trap)
                return;

        trap->data.ntc_145.new_sys_guid = ib_hfi1_sys_image_guid;
        trap->data.ntc_145.lid = trap->data.issuer_lid;

        trap->len = sizeof(trap->data);
        send_trap(ibp, trap);
}

/*
 * Send a Node Description Changed trap (ch. 14.3.13).
 */
void hfi1_node_desc_chg(struct hfi1_ibport *ibp)
{
        struct trap_node *trap;
        u32 lid = ppd_from_ibp(ibp)->lid;

        trap = create_trap_node(IB_NOTICE_TYPE_INFO,
                                OPA_TRAP_CHANGE_CAPABILITY,
                                lid);
        if (!trap)
                return;

        trap->data.ntc_144.lid = trap->data.issuer_lid;
        trap->data.ntc_144.change_flags =
                cpu_to_be16(OPA_NOTICE_TRAP_NODE_DESC_CHG);

        trap->len = sizeof(trap->data);
        send_trap(ibp, trap);
}

static int __subn_get_opa_nodedesc(struct opa_smp *smp, u32 am,
                                   u8 *data, struct ib_device *ibdev,
                                   u8 port, u32 *resp_len, u32 max_len)
{
        struct opa_node_description *nd;

        if (am || smp_length_check(sizeof(*nd), max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        nd = (struct opa_node_description *)data;

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

        if (resp_len)
                *resp_len += sizeof(*nd);

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_get_opa_nodeinfo(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len)
{
        struct opa_node_info *ni;
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        unsigned pidx = port - 1; /* IB number port from 1, hw from 0 */

        ni = (struct opa_node_info *)data;

        /* GUID 0 is illegal */
        if (am || pidx >= dd->num_pports || ibdev->node_guid == 0 ||
            smp_length_check(sizeof(*ni), max_len) ||
            get_sguid(to_iport(ibdev, port), HFI1_PORT_GUID_INDEX) == 0) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ni->port_guid = get_sguid(to_iport(ibdev, port), HFI1_PORT_GUID_INDEX);
        ni->base_version = OPA_MGMT_BASE_VERSION;
        ni->class_version = OPA_SM_CLASS_VERSION;
        ni->node_type = 1;     /* channel adapter */
        ni->num_ports = ibdev->phys_port_cnt;
        /* This is already in network order */
        ni->system_image_guid = ib_hfi1_sys_image_guid;
        ni->node_guid = ibdev->node_guid;
        ni->partition_cap = cpu_to_be16(hfi1_get_npkeys(dd));
        ni->device_id = cpu_to_be16(dd->pcidev->device);
        ni->revision = cpu_to_be32(dd->minrev);
        ni->local_port_num = port;
        ni->vendor_id[0] = dd->oui1;
        ni->vendor_id[1] = dd->oui2;
        ni->vendor_id[2] = dd->oui3;

        if (resp_len)
                *resp_len += sizeof(*ni);

        return reply((struct ib_mad_hdr *)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 hfi1_devdata *dd = dd_from_ibdev(ibdev);
        unsigned pidx = port - 1; /* IB number port from 1, hw from 0 */

        /* GUID 0 is illegal */
        if (smp->attr_mod || pidx >= dd->num_pports ||
            ibdev->node_guid == 0 ||
            get_sguid(to_iport(ibdev, port), HFI1_PORT_GUID_INDEX) == 0) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        nip->port_guid = get_sguid(to_iport(ibdev, port), HFI1_PORT_GUID_INDEX);
        nip->base_version = OPA_MGMT_BASE_VERSION;
        nip->class_version = OPA_SM_CLASS_VERSION;
        nip->node_type = 1;     /* channel adapter */
        nip->num_ports = ibdev->phys_port_cnt;
        /* This is already in network order */
        nip->sys_guid = ib_hfi1_sys_image_guid;
        nip->node_guid = ibdev->node_guid;
        nip->partition_cap = cpu_to_be16(hfi1_get_npkeys(dd));
        nip->device_id = cpu_to_be16(dd->pcidev->device);
        nip->revision = cpu_to_be32(dd->minrev);
        nip->local_port_num = port;
        nip->vendor_id[0] = dd->oui1;
        nip->vendor_id[1] = dd->oui2;
        nip->vendor_id[2] = dd->oui3;

        return reply((struct ib_mad_hdr *)smp);
}

static void set_link_width_enabled(struct hfi1_pportdata *ppd, u32 w)
{
        (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LWID_ENB, w);
}

static void set_link_width_downgrade_enabled(struct hfi1_pportdata *ppd, u32 w)
{
        (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LWID_DG_ENB, w);
}

static void set_link_speed_enabled(struct hfi1_pportdata *ppd, u32 s)
{
        (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_SPD_ENB, s);
}

static int check_mkey(struct hfi1_ibport *ibp, struct ib_mad_hdr *mad,
                      int mad_flags, __be64 mkey, __be32 dr_slid,
                      u8 return_path[], u8 hop_cnt)
{
        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 == mkey)
                valid_mkey = 1;

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

        if (!valid_mkey) {
                switch (mad->method) {
                case IB_MGMT_METHOD_GET:
                        /* Bad mkey not a violation below level 2 */
                        if (ibp->rvp.mkeyprot < 2)
                                break;
                        /* fall through */
                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. */
                        bad_mkey(ibp, mad, mkey, dr_slid, return_path,
                                 hop_cnt);
                        ret = 1;
                }
        }

        return ret;
}

/*
 * The SMA caches reads from LCB registers in case the LCB is unavailable.
 * (The LCB is unavailable in certain link states, for example.)
 */
struct lcb_datum {
        u32 off;
        u64 val;
};

static struct lcb_datum lcb_cache[] = {
        { DC_LCB_STS_ROUND_TRIP_LTP_CNT, 0 },
};

static int write_lcb_cache(u32 off, u64 val)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(lcb_cache); i++) {
                if (lcb_cache[i].off == off) {
                        lcb_cache[i].val = val;
                        return 0;
                }
        }

        pr_warn("%s bad offset 0x%x\n", __func__, off);
        return -1;
}

static int read_lcb_cache(u32 off, u64 *val)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(lcb_cache); i++) {
                if (lcb_cache[i].off == off) {
                        *val = lcb_cache[i].val;
                        return 0;
                }
        }

        pr_warn("%s bad offset 0x%x\n", __func__, off);
        return -1;
}

void read_ltp_rtt(struct hfi1_devdata *dd)
{
        u64 reg;

        if (read_lcb_csr(dd, DC_LCB_STS_ROUND_TRIP_LTP_CNT, &reg))
                dd_dev_err(dd, "%s: unable to read LTP RTT\n", __func__);
        else
                write_lcb_cache(DC_LCB_STS_ROUND_TRIP_LTP_CNT, reg);
}

static int __subn_get_opa_portinfo(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len)
{
        int i;
        struct hfi1_devdata *dd;
        struct hfi1_pportdata *ppd;
        struct hfi1_ibport *ibp;
        struct opa_port_info *pi = (struct opa_port_info *)data;
        u8 mtu;
        u8 credit_rate;
        u8 is_beaconing_active;
        u32 state;
        u32 num_ports = OPA_AM_NPORT(am);
        u32 start_of_sm_config = OPA_AM_START_SM_CFG(am);
        u32 buffer_units;
        u64 tmp = 0;

        if (num_ports != 1 || smp_length_check(sizeof(*pi), max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

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

        if (ppd->vls_supported / 2 > ARRAY_SIZE(pi->neigh_mtu.pvlx_to_mtu) ||
            ppd->vls_supported > ARRAY_SIZE(dd->vld)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        pi->lid = cpu_to_be32(ppd->lid);

        /* 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))
                pi->mkey = ibp->rvp.mkey;

        pi->subnet_prefix = ibp->rvp.gid_prefix;
        pi->sm_lid = cpu_to_be32(ibp->rvp.sm_lid);
        pi->ib_cap_mask = cpu_to_be32(ibp->rvp.port_cap_flags);
        pi->mkey_lease_period = cpu_to_be16(ibp->rvp.mkey_lease_period);
        pi->sm_trap_qp = cpu_to_be32(ppd->sm_trap_qp);
        pi->sa_qp = cpu_to_be32(ppd->sa_qp);

        pi->link_width.enabled = cpu_to_be16(ppd->link_width_enabled);
        pi->link_width.supported = cpu_to_be16(ppd->link_width_supported);
        pi->link_width.active = cpu_to_be16(ppd->link_width_active);

        pi->link_width_downgrade.supported =
                        cpu_to_be16(ppd->link_width_downgrade_supported);
        pi->link_width_downgrade.enabled =
                        cpu_to_be16(ppd->link_width_downgrade_enabled);
        pi->link_width_downgrade.tx_active =
                        cpu_to_be16(ppd->link_width_downgrade_tx_active);
        pi->link_width_downgrade.rx_active =
                        cpu_to_be16(ppd->link_width_downgrade_rx_active);

        pi->link_speed.supported = cpu_to_be16(ppd->link_speed_supported);
        pi->link_speed.active = cpu_to_be16(ppd->link_speed_active);
        pi->link_speed.enabled = cpu_to_be16(ppd->link_speed_enabled);

        state = driver_lstate(ppd);

        if (start_of_sm_config && (state == IB_PORT_INIT))
                ppd->is_sm_config_started = 1;

        pi->port_phys_conf = (ppd->port_type & 0xf);

        pi->port_states.ledenable_offlinereason = ppd->neighbor_normal << 4;
        pi->port_states.ledenable_offlinereason |=
                ppd->is_sm_config_started << 5;
        /*
         * This pairs with the memory barrier in hfi1_start_led_override to
         * ensure that we read the correct state of LED beaconing represented
         * by led_override_timer_active
         */
        smp_rmb();
        is_beaconing_active = !!atomic_read(&ppd->led_override_timer_active);
        pi->port_states.ledenable_offlinereason |= is_beaconing_active << 6;
        pi->port_states.ledenable_offlinereason |=
                ppd->offline_disabled_reason;

        pi->port_states.portphysstate_portstate =
                (driver_pstate(ppd) << 4) | state;

        pi->mkeyprotect_lmc = (ibp->rvp.mkeyprot << 6) | ppd->lmc;

        memset(pi->neigh_mtu.pvlx_to_mtu, 0, sizeof(pi->neigh_mtu.pvlx_to_mtu));
        for (i = 0; i < ppd->vls_supported; i++) {
                mtu = mtu_to_enum(dd->vld[i].mtu, HFI1_DEFAULT_ACTIVE_MTU);
                if ((i % 2) == 0)
                        pi->neigh_mtu.pvlx_to_mtu[i / 2] |= (mtu << 4);
                else
                        pi->neigh_mtu.pvlx_to_mtu[i / 2] |= mtu;
        }
        /* don't forget VL 15 */
        mtu = mtu_to_enum(dd->vld[15].mtu, 2048);
        pi->neigh_mtu.pvlx_to_mtu[15 / 2] |= mtu;
        pi->smsl = ibp->rvp.sm_sl & OPA_PI_MASK_SMSL;
        pi->operational_vls = hfi1_get_ib_cfg(ppd, HFI1_IB_CFG_OP_VLS);
        pi->partenforce_filterraw |=
                (ppd->linkinit_reason & OPA_PI_MASK_LINKINIT_REASON);
        if (ppd->part_enforce & HFI1_PART_ENFORCE_IN)
                pi->partenforce_filterraw |= OPA_PI_MASK_PARTITION_ENFORCE_IN;
        if (ppd->part_enforce & HFI1_PART_ENFORCE_OUT)
                pi->partenforce_filterraw |= OPA_PI_MASK_PARTITION_ENFORCE_OUT;
        pi->mkey_violations = cpu_to_be16(ibp->rvp.mkey_violations);
        /* P_KeyViolations are counted by hardware. */
        pi->pkey_violations = cpu_to_be16(ibp->rvp.pkey_violations);
        pi->qkey_violations = cpu_to_be16(ibp->rvp.qkey_violations);

        pi->vl.cap = ppd->vls_supported;
        pi->vl.high_limit = cpu_to_be16(ibp->rvp.vl_high_limit);
        pi->vl.arb_high_cap = (u8)hfi1_get_ib_cfg(ppd, HFI1_IB_CFG_VL_HIGH_CAP);
        pi->vl.arb_low_cap = (u8)hfi1_get_ib_cfg(ppd, HFI1_IB_CFG_VL_LOW_CAP);

        pi->clientrereg_subnettimeout = ibp->rvp.subnet_timeout;

        pi->port_link_mode  = cpu_to_be16(OPA_PORT_LINK_MODE_OPA << 10 |
                                          OPA_PORT_LINK_MODE_OPA << 5 |
                                          OPA_PORT_LINK_MODE_OPA);

        pi->port_ltp_crc_mode = cpu_to_be16(ppd->port_ltp_crc_mode);

        pi->port_mode = cpu_to_be16(
                                ppd->is_active_optimize_enabled ?
                                        OPA_PI_MASK_PORT_ACTIVE_OPTOMIZE : 0);

        pi->port_packet_format.supported =
                cpu_to_be16(OPA_PORT_PACKET_FORMAT_9B |
                            OPA_PORT_PACKET_FORMAT_16B);
        pi->port_packet_format.enabled =
                cpu_to_be16(OPA_PORT_PACKET_FORMAT_9B |
                            OPA_PORT_PACKET_FORMAT_16B);

        /* flit_control.interleave is (OPA V1, version .76):
         * bits         use
         * ----         ---
         * 2            res
         * 2            DistanceSupported
         * 2            DistanceEnabled
         * 5            MaxNextLevelTxEnabled
         * 5            MaxNestLevelRxSupported
         *
         * HFI supports only "distance mode 1" (see OPA V1, version .76,
         * section 9.6.2), so set DistanceSupported, DistanceEnabled
         * to 0x1.
         */
        pi->flit_control.interleave = cpu_to_be16(0x1400);

        pi->link_down_reason = ppd->local_link_down_reason.sma;
        pi->neigh_link_down_reason = ppd->neigh_link_down_reason.sma;
        pi->port_error_action = cpu_to_be32(ppd->port_error_action);
        pi->mtucap = mtu_to_enum(hfi1_max_mtu, IB_MTU_4096);

        /* 32.768 usec. response time (guessing) */
        pi->resptimevalue = 3;

        pi->local_port_num = port;

        /* buffer info for FM */
        pi->overall_buffer_space = cpu_to_be16(dd->link_credits);

        pi->neigh_node_guid = cpu_to_be64(ppd->neighbor_guid);
        pi->neigh_port_num = ppd->neighbor_port_number;
        pi->port_neigh_mode =
                (ppd->neighbor_type & OPA_PI_MASK_NEIGH_NODE_TYPE) |
                (ppd->mgmt_allowed ? OPA_PI_MASK_NEIGH_MGMT_ALLOWED : 0) |
                (ppd->neighbor_fm_security ?
                        OPA_PI_MASK_NEIGH_FW_AUTH_BYPASS : 0);

        /* HFIs shall always return VL15 credits to their
         * neighbor in a timely manner, without any credit return pacing.
         */
        credit_rate = 0;
        buffer_units  = (dd->vau) & OPA_PI_MASK_BUF_UNIT_BUF_ALLOC;
        buffer_units |= (dd->vcu << 3) & OPA_PI_MASK_BUF_UNIT_CREDIT_ACK;
        buffer_units |= (credit_rate << 6) &
                                OPA_PI_MASK_BUF_UNIT_VL15_CREDIT_RATE;
        buffer_units |= (dd->vl15_init << 11) & OPA_PI_MASK_BUF_UNIT_VL15_INIT;
        pi->buffer_units = cpu_to_be32(buffer_units);

        pi->opa_cap_mask = cpu_to_be16(ibp->rvp.port_cap3_flags);
        pi->collectivemask_multicastmask = ((OPA_COLLECTIVE_NR & 0x7)
                                            << 3 | (OPA_MCAST_NR & 0x7));

        /* HFI supports a replay buffer 128 LTPs in size */
        pi->replay_depth.buffer = 0x80;
        /* read the cached value of DC_LCB_STS_ROUND_TRIP_LTP_CNT */
        read_lcb_cache(DC_LCB_STS_ROUND_TRIP_LTP_CNT, &tmp);

        /*
         * this counter is 16 bits wide, but the replay_depth.wire
         * variable is only 8 bits
         */
        if (tmp > 0xff)
                tmp = 0xff;
        pi->replay_depth.wire = tmp;

        if (resp_len)

                *resp_len += sizeof(struct opa_port_info);

        return reply((struct ib_mad_hdr *)smp);
}

/**
 * get_pkeys - return the PKEY table
 * @dd: the hfi1_ib device
 * @port: the IB port number
 * @pkeys: the pkey table is placed here
 */
static int get_pkeys(struct hfi1_devdata *dd, u8 port, u16 *pkeys)
{
        struct hfi1_pportdata *ppd = dd->pport + port - 1;

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

        return 0;
}

static int __subn_get_opa_pkeytable(struct opa_smp *smp, u32 am, u8 *data,
                                    struct ib_device *ibdev, u8 port,
                                    u32 *resp_len, u32 max_len)
{
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        u32 n_blocks_req = OPA_AM_NBLK(am);
        u32 start_block = am & 0x7ff;
        __be16 *p;
        u16 *q;
        int i;
        u16 n_blocks_avail;
        unsigned npkeys = hfi1_get_npkeys(dd);
        size_t size;

        if (n_blocks_req == 0) {
                pr_warn("OPA Get PKey AM Invalid : P = %d; B = 0x%x; N = 0x%x\n",
                        port, start_block, n_blocks_req);
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        n_blocks_avail = (u16)(npkeys / OPA_PARTITION_TABLE_BLK_SIZE) + 1;

        size = (n_blocks_req * OPA_PARTITION_TABLE_BLK_SIZE) * sizeof(u16);

        if (smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        if (start_block + n_blocks_req > n_blocks_avail ||
            n_blocks_req > OPA_NUM_PKEY_BLOCKS_PER_SMP) {
                pr_warn("OPA Get PKey AM Invalid : s 0x%x; req 0x%x; "
                        "avail 0x%x; blk/smp 0x%lx\n",
                        start_block, n_blocks_req, n_blocks_avail,
                        OPA_NUM_PKEY_BLOCKS_PER_SMP);
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        p = (__be16 *)data;
        q = (u16 *)data;
        /* get the real pkeys if we are requesting the first block */
        if (start_block == 0) {
                get_pkeys(dd, port, q);
                for (i = 0; i < npkeys; i++)
                        p[i] = cpu_to_be16(q[i]);
                if (resp_len)
                        *resp_len += size;
        } else {
                smp->status |= IB_SMP_INVALID_FIELD;
        }
        return reply((struct ib_mad_hdr *)smp);
}

enum {
        HFI_TRANSITION_DISALLOWED,
        HFI_TRANSITION_IGNORED,
        HFI_TRANSITION_ALLOWED,
        HFI_TRANSITION_UNDEFINED,
};

/*
 * Use shortened names to improve readability of
 * {logical,physical}_state_transitions
 */
enum {
        __D = HFI_TRANSITION_DISALLOWED,
        __I = HFI_TRANSITION_IGNORED,
        __A = HFI_TRANSITION_ALLOWED,
        __U = HFI_TRANSITION_UNDEFINED,
};

/*
 * IB_PORTPHYSSTATE_POLLING (2) through OPA_PORTPHYSSTATE_MAX (11) are
 * represented in physical_state_transitions.
 */
#define __N_PHYSTATES (OPA_PORTPHYSSTATE_MAX - IB_PORTPHYSSTATE_POLLING + 1)

/*
 * Within physical_state_transitions, rows represent "old" states,
 * columns "new" states, and physical_state_transitions.allowed[old][new]
 * indicates if the transition from old state to new state is legal (see
 * OPAg1v1, Table 6-4).
 */
static const struct {
        u8 allowed[__N_PHYSTATES][__N_PHYSTATES];
} physical_state_transitions = {
        {
                /* 2    3    4    5    6    7    8    9   10   11 */
        /* 2 */ { __A, __A, __D, __D, __D, __D, __D, __D, __D, __D },
        /* 3 */ { __A, __I, __D, __D, __D, __D, __D, __D, __D, __A },
        /* 4 */ { __U, __U, __U, __U, __U, __U, __U, __U, __U, __U },
        /* 5 */ { __A, __A, __D, __I, __D, __D, __D, __D, __D, __D },
        /* 6 */ { __U, __U, __U, __U, __U, __U, __U, __U, __U, __U },
        /* 7 */ { __D, __A, __D, __D, __D, __I, __D, __D, __D, __D },
        /* 8 */ { __U, __U, __U, __U, __U, __U, __U, __U, __U, __U },
        /* 9 */ { __I, __A, __D, __D, __D, __D, __D, __I, __D, __D },
        /*10 */ { __U, __U, __U, __U, __U, __U, __U, __U, __U, __U },
        /*11 */ { __D, __A, __D, __D, __D, __D, __D, __D, __D, __I },
        }
};

/*
 * IB_PORT_DOWN (1) through IB_PORT_ACTIVE_DEFER (5) are represented
 * logical_state_transitions
 */

#define __N_LOGICAL_STATES (IB_PORT_ACTIVE_DEFER - IB_PORT_DOWN + 1)

/*
 * Within logical_state_transitions rows represent "old" states,
 * columns "new" states, and logical_state_transitions.allowed[old][new]
 * indicates if the transition from old state to new state is legal (see
 * OPAg1v1, Table 9-12).
 */
static const struct {
        u8 allowed[__N_LOGICAL_STATES][__N_LOGICAL_STATES];
} logical_state_transitions = {
        {
                /* 1    2    3    4    5 */
        /* 1 */ { __I, __D, __D, __D, __U},
        /* 2 */ { __D, __I, __A, __D, __U},
        /* 3 */ { __D, __D, __I, __A, __U},
        /* 4 */ { __D, __D, __I, __I, __U},
        /* 5 */ { __U, __U, __U, __U, __U},
        }
};

static int logical_transition_allowed(int old, int new)
{
        if (old < IB_PORT_NOP || old > IB_PORT_ACTIVE_DEFER ||
            new < IB_PORT_NOP || new > IB_PORT_ACTIVE_DEFER) {
                pr_warn("invalid logical state(s) (old %d new %d)\n",
                        old, new);
                return HFI_TRANSITION_UNDEFINED;
        }

        if (new == IB_PORT_NOP)
                return HFI_TRANSITION_ALLOWED; /* always allowed */

        /* adjust states for indexing into logical_state_transitions */
        old -= IB_PORT_DOWN;
        new -= IB_PORT_DOWN;

        if (old < 0 || new < 0)
                return HFI_TRANSITION_UNDEFINED;
        return logical_state_transitions.allowed[old][new];
}

static int physical_transition_allowed(int old, int new)
{
        if (old < IB_PORTPHYSSTATE_NOP || old > OPA_PORTPHYSSTATE_MAX ||
            new < IB_PORTPHYSSTATE_NOP || new > OPA_PORTPHYSSTATE_MAX) {
                pr_warn("invalid physical state(s) (old %d new %d)\n",
                        old, new);
                return HFI_TRANSITION_UNDEFINED;
        }

        if (new == IB_PORTPHYSSTATE_NOP)
                return HFI_TRANSITION_ALLOWED; /* always allowed */

        /* adjust states for indexing into physical_state_transitions */
        old -= IB_PORTPHYSSTATE_POLLING;
        new -= IB_PORTPHYSSTATE_POLLING;

        if (old < 0 || new < 0)
                return HFI_TRANSITION_UNDEFINED;
        return physical_state_transitions.allowed[old][new];
}

static int port_states_transition_allowed(struct hfi1_pportdata *ppd,
                                          u32 logical_new, u32 physical_new)
{
        u32 physical_old = driver_pstate(ppd);
        u32 logical_old = driver_lstate(ppd);
        int ret, logical_allowed, physical_allowed;

        ret = logical_transition_allowed(logical_old, logical_new);
        logical_allowed = ret;

        if (ret == HFI_TRANSITION_DISALLOWED ||
            ret == HFI_TRANSITION_UNDEFINED) {
                pr_warn("invalid logical state transition %s -> %s\n",
                        opa_lstate_name(logical_old),
                        opa_lstate_name(logical_new));
                return ret;
        }

        ret = physical_transition_allowed(physical_old, physical_new);
        physical_allowed = ret;

        if (ret == HFI_TRANSITION_DISALLOWED ||
            ret == HFI_TRANSITION_UNDEFINED) {
                pr_warn("invalid physical state transition %s -> %s\n",
                        opa_pstate_name(physical_old),
                        opa_pstate_name(physical_new));
                return ret;
        }

        if (logical_allowed == HFI_TRANSITION_IGNORED &&
            physical_allowed == HFI_TRANSITION_IGNORED)
                return HFI_TRANSITION_IGNORED;

        /*
         * A change request of Physical Port State from
         * 'Offline' to 'Polling' should be ignored.
         */
        if ((physical_old == OPA_PORTPHYSSTATE_OFFLINE) &&
            (physical_new == IB_PORTPHYSSTATE_POLLING))
                return HFI_TRANSITION_IGNORED;

        /*
         * Either physical_allowed or logical_allowed is
         * HFI_TRANSITION_ALLOWED.
         */
        return HFI_TRANSITION_ALLOWED;
}

static int set_port_states(struct hfi1_pportdata *ppd, struct opa_smp *smp,
                           u32 logical_state, u32 phys_state, int local_mad)
{
        struct hfi1_devdata *dd = ppd->dd;
        u32 link_state;
        int ret;

        ret = port_states_transition_allowed(ppd, logical_state, phys_state);
        if (ret == HFI_TRANSITION_DISALLOWED ||
            ret == HFI_TRANSITION_UNDEFINED) {
                /* error message emitted above */
                smp->status |= IB_SMP_INVALID_FIELD;
                return 0;
        }

        if (ret == HFI_TRANSITION_IGNORED)
                return 0;

        if ((phys_state != IB_PORTPHYSSTATE_NOP) &&
            !(logical_state == IB_PORT_DOWN ||
              logical_state == IB_PORT_NOP)){
                pr_warn("SubnSet(OPA_PortInfo) port state invalid: logical_state 0x%x physical_state 0x%x\n",
                        logical_state, phys_state);
                smp->status |= IB_SMP_INVALID_FIELD;
        }

        /*
         * Logical state changes are summarized in OPAv1g1 spec.,
         * Table 9-12; physical state changes are summarized in
         * OPAv1g1 spec., Table 6.4.
         */
        switch (logical_state) {
        case IB_PORT_NOP:
                if (phys_state == IB_PORTPHYSSTATE_NOP)
                        break;
                /* FALLTHROUGH */
        case IB_PORT_DOWN:
                if (phys_state == IB_PORTPHYSSTATE_NOP) {
                        link_state = HLS_DN_DOWNDEF;
                } else if (phys_state == IB_PORTPHYSSTATE_POLLING) {
                        link_state = HLS_DN_POLL;
                        set_link_down_reason(ppd, OPA_LINKDOWN_REASON_FM_BOUNCE,
                                             0, OPA_LINKDOWN_REASON_FM_BOUNCE);
                } else if (phys_state == IB_PORTPHYSSTATE_DISABLED) {
                        link_state = HLS_DN_DISABLE;
                } else {
                        pr_warn("SubnSet(OPA_PortInfo) invalid physical state 0x%x\n",
                                phys_state);
                        smp->status |= IB_SMP_INVALID_FIELD;
                        break;
                }

                if ((link_state == HLS_DN_POLL ||
                     link_state == HLS_DN_DOWNDEF)) {
                        /*
                         * Going to poll.  No matter what the current state,
                         * always move offline first, then tune and start the
                         * link.  This correctly handles a FM link bounce and
                         * a link enable.  Going offline is a no-op if already
                         * offline.
                         */
                        set_link_state(ppd, HLS_DN_OFFLINE);
                        start_link(ppd);
                } else {
                        set_link_state(ppd, link_state);
                }
                if (link_state == HLS_DN_DISABLE &&
                    (ppd->offline_disabled_reason >
                     HFI1_ODR_MASK(OPA_LINKDOWN_REASON_SMA_DISABLED) ||
                     ppd->offline_disabled_reason ==
                     HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE)))
                        ppd->offline_disabled_reason =
                        HFI1_ODR_MASK(OPA_LINKDOWN_REASON_SMA_DISABLED);
                /*
                 * Don't send a reply if the response would be sent
                 * through the disabled port.
                 */
                if (link_state == HLS_DN_DISABLE && !local_mad)
                        return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
                break;
        case IB_PORT_ARMED:
                ret = set_link_state(ppd, HLS_UP_ARMED);
                if (!ret)
                        send_idle_sma(dd, SMA_IDLE_ARM);
                break;
        case IB_PORT_ACTIVE:
                if (ppd->neighbor_normal) {
                        ret = set_link_state(ppd, HLS_UP_ACTIVE);
                        if (ret == 0)
                                send_idle_sma(dd, SMA_IDLE_ACTIVE);
                } else {
                        pr_warn("SubnSet(OPA_PortInfo) Cannot move to Active with NeighborNormal 0\n");
                        smp->status |= IB_SMP_INVALID_FIELD;
                }
                break;
        default:
                pr_warn("SubnSet(OPA_PortInfo) invalid logical state 0x%x\n",
                        logical_state);
                smp->status |= IB_SMP_INVALID_FIELD;
        }

        return 0;
}

/**
 * subn_set_opa_portinfo - set port information
 * @smp: the incoming SM packet
 * @ibdev: the infiniband device
 * @port: the port on the device
 *
 */
static int __subn_set_opa_portinfo(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len, int local_mad)
{
        struct opa_port_info *pi = (struct opa_port_info *)data;
        struct ib_event event;
        struct hfi1_devdata *dd;
        struct hfi1_pportdata *ppd;
        struct hfi1_ibport *ibp;
        u8 clientrereg;
        unsigned long flags;
        u32 smlid;
        u32 lid;
        u8 ls_old, ls_new, ps_new;
        u8 vls;
        u8 msl;
        u8 crc_enabled;
        u16 lse, lwe, mtu;
        u32 num_ports = OPA_AM_NPORT(am);
        u32 start_of_sm_config = OPA_AM_START_SM_CFG(am);
        int ret, i, invalid = 0, call_set_mtu = 0;
        int call_link_downgrade_policy = 0;

        if (num_ports != 1 ||
            smp_length_check(sizeof(*pi), max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        lid = be32_to_cpu(pi->lid);
        if (lid & 0xFF000000) {
                pr_warn("OPA_PortInfo lid out of range: %X\n", lid);
                smp->status |= IB_SMP_INVALID_FIELD;
                goto get_only;
        }


        smlid = be32_to_cpu(pi->sm_lid);
        if (smlid & 0xFF000000) {
                pr_warn("OPA_PortInfo SM lid out of range: %X\n", smlid);
                smp->status |= IB_SMP_INVALID_FIELD;
                goto get_only;
        }

        clientrereg = (pi->clientrereg_subnettimeout &
                        OPA_PI_MASK_CLIENT_REREGISTER);

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

        ls_old = driver_lstate(ppd);

        ibp->rvp.mkey = pi->mkey;
        if (ibp->rvp.gid_prefix != pi->subnet_prefix) {
                ibp->rvp.gid_prefix = pi->subnet_prefix;
                event.event = IB_EVENT_GID_CHANGE;
                ib_dispatch_event(&event);
        }
        ibp->rvp.mkey_lease_period = be16_to_cpu(pi->mkey_lease_period);

        /* Must be a valid unicast LID address. */
        if ((lid == 0 && ls_old > IB_PORT_INIT) ||
             (hfi1_is_16B_mcast(lid))) {
                smp->status |= IB_SMP_INVALID_FIELD;
                pr_warn("SubnSet(OPA_PortInfo) lid invalid 0x%x\n",
                        lid);
        } else if (ppd->lid != lid ||
                 ppd->lmc != (pi->mkeyprotect_lmc & OPA_PI_MASK_LMC)) {
                if (ppd->lid != lid)
                        hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LID_CHANGE_BIT);
                if (ppd->lmc != (pi->mkeyprotect_lmc & OPA_PI_MASK_LMC))
                        hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LMC_CHANGE_BIT);
                hfi1_set_lid(ppd, lid, pi->mkeyprotect_lmc & OPA_PI_MASK_LMC);
                event.event = IB_EVENT_LID_CHANGE;
                ib_dispatch_event(&event);

                if (HFI1_PORT_GUID_INDEX + 1 < HFI1_GUIDS_PER_PORT) {
                        /* Manufacture GID from LID to support extended
                         * addresses
                         */
                        ppd->guids[HFI1_PORT_GUID_INDEX + 1] =
                                be64_to_cpu(OPA_MAKE_ID(lid));
                        event.event = IB_EVENT_GID_CHANGE;
                        ib_dispatch_event(&event);
                }
        }

        msl = pi->smsl & OPA_PI_MASK_SMSL;
        if (pi->partenforce_filterraw & OPA_PI_MASK_LINKINIT_REASON)
                ppd->linkinit_reason =
                        (pi->partenforce_filterraw &
                         OPA_PI_MASK_LINKINIT_REASON);

        /* Must be a valid unicast LID address. */
        if ((smlid == 0 && ls_old > IB_PORT_INIT) ||
             (hfi1_is_16B_mcast(smlid))) {
                smp->status |= IB_SMP_INVALID_FIELD;
                pr_warn("SubnSet(OPA_PortInfo) smlid invalid 0x%x\n", smlid);
        } else if (smlid != ibp->rvp.sm_lid || msl != ibp->rvp.sm_sl) {
                pr_warn("SubnSet(OPA_PortInfo) smlid 0x%x\n", smlid);
                spin_lock_irqsave(&ibp->rvp.lock, flags);
                if (ibp->rvp.sm_ah) {
                        if (smlid != ibp->rvp.sm_lid)
                                hfi1_modify_qp0_ah(ibp, ibp->rvp.sm_ah, 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);
        }

        if (pi->link_down_reason == 0) {
                ppd->local_link_down_reason.sma = 0;
                ppd->local_link_down_reason.latest = 0;
        }

        if (pi->neigh_link_down_reason == 0) {
                ppd->neigh_link_down_reason.sma = 0;
                ppd->neigh_link_down_reason.latest = 0;
        }

        ppd->sm_trap_qp = be32_to_cpu(pi->sm_trap_qp);
        ppd->sa_qp = be32_to_cpu(pi->sa_qp);

        ppd->port_error_action = be32_to_cpu(pi->port_error_action);
        lwe = be16_to_cpu(pi->link_width.enabled);
        if (lwe) {
                if (lwe == OPA_LINK_WIDTH_RESET ||
                    lwe == OPA_LINK_WIDTH_RESET_OLD)
                        set_link_width_enabled(ppd, ppd->link_width_supported);
                else if ((lwe & ~ppd->link_width_supported) == 0)
                        set_link_width_enabled(ppd, lwe);
                else
                        smp->status |= IB_SMP_INVALID_FIELD;
        }
        lwe = be16_to_cpu(pi->link_width_downgrade.enabled);
        /* LWD.E is always applied - 0 means "disabled" */
        if (lwe == OPA_LINK_WIDTH_RESET ||
            lwe == OPA_LINK_WIDTH_RESET_OLD) {
                set_link_width_downgrade_enabled(ppd,
                                                 ppd->
                                                 link_width_downgrade_supported
                                                 );
        } else if ((lwe & ~ppd->link_width_downgrade_supported) == 0) {
                /* only set and apply if something changed */
                if (lwe != ppd->link_width_downgrade_enabled) {
                        set_link_width_downgrade_enabled(ppd, lwe);
                        call_link_downgrade_policy = 1;
                }
        } else {
                smp->status |= IB_SMP_INVALID_FIELD;
        }
        lse = be16_to_cpu(pi->link_speed.enabled);
        if (lse) {
                if (lse & be16_to_cpu(pi->link_speed.supported))
                        set_link_speed_enabled(ppd, lse);
                else
                        smp->status |= IB_SMP_INVALID_FIELD;
        }

        ibp->rvp.mkeyprot =
                (pi->mkeyprotect_lmc & OPA_PI_MASK_MKEY_PROT_BIT) >> 6;
        ibp->rvp.vl_high_limit = be16_to_cpu(pi->vl.high_limit) & 0xFF;
        (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_VL_HIGH_LIMIT,
                                    ibp->rvp.vl_high_limit);

        if (ppd->vls_supported / 2 > ARRAY_SIZE(pi->neigh_mtu.pvlx_to_mtu) ||
            ppd->vls_supported > ARRAY_SIZE(dd->vld)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }
        for (i = 0; i < ppd->vls_supported; i++) {
                if ((i % 2) == 0)
                        mtu = enum_to_mtu((pi->neigh_mtu.pvlx_to_mtu[i / 2] >>
                                           4) & 0xF);
                else
                        mtu = enum_to_mtu(pi->neigh_mtu.pvlx_to_mtu[i / 2] &
                                          0xF);
                if (mtu == 0xffff) {
                        pr_warn("SubnSet(OPA_PortInfo) mtu invalid %d (0x%x)\n",
                                mtu,
                                (pi->neigh_mtu.pvlx_to_mtu[0] >> 4) & 0xF);
                        smp->status |= IB_SMP_INVALID_FIELD;
                        mtu = hfi1_max_mtu; /* use a valid MTU */
                }
                if (dd->vld[i].mtu != mtu) {
                        dd_dev_info(dd,
                                    "MTU change on vl %d from %d to %d\n",
                                    i, dd->vld[i].mtu, mtu);
                        dd->vld[i].mtu = mtu;
                        call_set_mtu++;
                }
        }
        /* As per OPAV1 spec: VL15 must support and be configured
         * for operation with a 2048 or larger MTU.
         */
        mtu = enum_to_mtu(pi->neigh_mtu.pvlx_to_mtu[15 / 2] & 0xF);
        if (mtu < 2048 || mtu == 0xffff)
                mtu = 2048;
        if (dd->vld[15].mtu != mtu) {
                dd_dev_info(dd,
                            "MTU change on vl 15 from %d to %d\n",
                            dd->vld[15].mtu, mtu);
                dd->vld[15].mtu = mtu;
                call_set_mtu++;
        }
        if (call_set_mtu)
                set_mtu(ppd);

        /* Set operational VLs */
        vls = pi->operational_vls & OPA_PI_MASK_OPERATIONAL_VL;
        if (vls) {
                if (vls > ppd->vls_supported) {
                        pr_warn("SubnSet(OPA_PortInfo) VL's supported invalid %d\n",
                                pi->operational_vls);
                        smp->status |= IB_SMP_INVALID_FIELD;
                } else {
                        if (hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_OP_VLS,
                                            vls) == -EINVAL)
                                smp->status |= IB_SMP_INVALID_FIELD;
                }
        }

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

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

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

        ibp->rvp.subnet_timeout =
                pi->clientrereg_subnettimeout & OPA_PI_MASK_SUBNET_TIMEOUT;

        crc_enabled = be16_to_cpu(pi->port_ltp_crc_mode);
        crc_enabled >>= 4;
        crc_enabled &= 0xf;

        if (crc_enabled != 0)
                ppd->port_crc_mode_enabled = port_ltp_to_cap(crc_enabled);

        ppd->is_active_optimize_enabled =
                        !!(be16_to_cpu(pi->port_mode)
                                        & OPA_PI_MASK_PORT_ACTIVE_OPTOMIZE);

        ls_new = pi->port_states.portphysstate_portstate &
                        OPA_PI_MASK_PORT_STATE;
        ps_new = (pi->port_states.portphysstate_portstate &
                        OPA_PI_MASK_PORT_PHYSICAL_STATE) >> 4;

        if (ls_old == IB_PORT_INIT) {
                if (start_of_sm_config) {
                        if (ls_new == ls_old || (ls_new == IB_PORT_ARMED))
                                ppd->is_sm_config_started = 1;
                } else if (ls_new == IB_PORT_ARMED) {
                        if (ppd->is_sm_config_started == 0) {
                                invalid = 1;
                                smp->status |= IB_SMP_INVALID_FIELD;
                        }
                }
        }

        /* Handle CLIENT_REREGISTER event b/c SM asked us for it */
        if (clientrereg) {
                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.
         */

        if (!invalid) {
                ret = set_port_states(ppd, smp, ls_new, ps_new, local_mad);
                if (ret)
                        return ret;
        }

        ret = __subn_get_opa_portinfo(smp, am, data, ibdev, port, resp_len,
                                      max_len);

        /* restore re-reg bit per o14-12.2.1 */
        pi->clientrereg_subnettimeout |= clientrereg;

        /*
         * Apply the new link downgrade policy.  This may result in a link
         * bounce.  Do this after everything else so things are settled.
         * Possible problem: if setting the port state above fails, then
         * the policy change is not applied.
         */
        if (call_link_downgrade_policy)
                apply_link_downgrade_policy(ppd, 0);

        return ret;

get_only:
        return __subn_get_opa_portinfo(smp, am, data, ibdev, port, resp_len,
                                       max_len);
}

/**
 * set_pkeys - set the PKEY table for ctxt 0
 * @dd: the hfi1_ib device
 * @port: the IB port number
 * @pkeys: the PKEY table
 */
static int set_pkeys(struct hfi1_devdata *dd, u8 port, u16 *pkeys)
{
        struct hfi1_pportdata *ppd;
        int i;
        int changed = 0;
        int update_includes_mgmt_partition = 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);
        /*
         * If the update does not include the management pkey, don't do it.
         */
        for (i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
                if (pkeys[i] == LIM_MGMT_P_KEY) {
                        update_includes_mgmt_partition = 1;
                        break;
                }
        }

        if (!update_includes_mgmt_partition)
                return 1;

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

                if (key == okey)
                        continue;
                /*
                 * The SM gives us the complete PKey table. We have
                 * to ensure that we put the PKeys in the matching
                 * slots.
                 */
                ppd->pkeys[i] = key;
                changed = 1;
        }

        if (changed) {
                (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_PKEYS, 0);
                hfi1_event_pkey_change(dd, port);
        }

        return 0;
}

static int __subn_set_opa_pkeytable(struct opa_smp *smp, u32 am, u8 *data,
                                    struct ib_device *ibdev, u8 port,
                                    u32 *resp_len, u32 max_len)
{
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        u32 n_blocks_sent = OPA_AM_NBLK(am);
        u32 start_block = am & 0x7ff;
        u16 *p = (u16 *)data;
        __be16 *q = (__be16 *)data;
        int i;
        u16 n_blocks_avail;
        unsigned npkeys = hfi1_get_npkeys(dd);
        u32 size = 0;

        if (n_blocks_sent == 0) {
                pr_warn("OPA Get PKey AM Invalid : P = %d; B = 0x%x; N = 0x%x\n",
                        port, start_block, n_blocks_sent);
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        n_blocks_avail = (u16)(npkeys / OPA_PARTITION_TABLE_BLK_SIZE) + 1;

        size = sizeof(u16) * (n_blocks_sent * OPA_PARTITION_TABLE_BLK_SIZE);

        if (smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        if (start_block + n_blocks_sent > n_blocks_avail ||
            n_blocks_sent > OPA_NUM_PKEY_BLOCKS_PER_SMP) {
                pr_warn("OPA Set PKey AM Invalid : s 0x%x; req 0x%x; avail 0x%x; blk/smp 0x%lx\n",
                        start_block, n_blocks_sent, n_blocks_avail,
                        OPA_NUM_PKEY_BLOCKS_PER_SMP);
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        for (i = 0; i < n_blocks_sent * OPA_PARTITION_TABLE_BLK_SIZE; i++)
                p[i] = be16_to_cpu(q[i]);

        if (start_block == 0 && set_pkeys(dd, port, p) != 0) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        return __subn_get_opa_pkeytable(smp, am, data, ibdev, port, resp_len,
                                        max_len);
}

#define ILLEGAL_VL 12
/*
 * filter_sc2vlt changes mappings to VL15 to ILLEGAL_VL (except
 * for SC15, which must map to VL15). If we don't remap things this
 * way it is possible for VL15 counters to increment when we try to
 * send on a SC which is mapped to an invalid VL.
 * When getting the table convert ILLEGAL_VL back to VL15.
 */
static void filter_sc2vlt(void *data, bool set)
{
        int i;
        u8 *pd = data;

        for (i = 0; i < OPA_MAX_SCS; i++) {
                if (i == 15)
                        continue;

                if (set) {
                        if ((pd[i] & 0x1f) == 0xf)
                                pd[i] = ILLEGAL_VL;
                } else {
                        if ((pd[i] & 0x1f) == ILLEGAL_VL)
                                pd[i] = 0xf;
                }
        }
}

static int set_sc2vlt_tables(struct hfi1_devdata *dd, void *data)
{
        u64 *val = data;

        filter_sc2vlt(data, true);

        write_csr(dd, SEND_SC2VLT0, *val++);
        write_csr(dd, SEND_SC2VLT1, *val++);
        write_csr(dd, SEND_SC2VLT2, *val++);
        write_csr(dd, SEND_SC2VLT3, *val++);
        write_seqlock_irq(&dd->sc2vl_lock);
        memcpy(dd->sc2vl, data, sizeof(dd->sc2vl));
        write_sequnlock_irq(&dd->sc2vl_lock);
        return 0;
}

static int get_sc2vlt_tables(struct hfi1_devdata *dd, void *data)
{
        u64 *val = (u64 *)data;

        *val++ = read_csr(dd, SEND_SC2VLT0);
        *val++ = read_csr(dd, SEND_SC2VLT1);
        *val++ = read_csr(dd, SEND_SC2VLT2);
        *val++ = read_csr(dd, SEND_SC2VLT3);

        filter_sc2vlt((u64 *)data, false);
        return 0;
}

static int __subn_get_opa_sl_to_sc(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len)
{
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        u8 *p = data;
        size_t size = ARRAY_SIZE(ibp->sl_to_sc); /* == 32 */
        unsigned i;

        if (am || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        for (i = 0; i < ARRAY_SIZE(ibp->sl_to_sc); i++)
                *p++ = ibp->sl_to_sc[i];

        if (resp_len)
                *resp_len += size;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_sl_to_sc(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len)
{
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        u8 *p = data;
        size_t size = ARRAY_SIZE(ibp->sl_to_sc);
        int i;
        u8 sc;

        if (am || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        for (i = 0; i <  ARRAY_SIZE(ibp->sl_to_sc); i++) {
                sc = *p++;
                if (ibp->sl_to_sc[i] != sc) {
                        ibp->sl_to_sc[i] = sc;

                        /* Put all stale qps into error state */
                        hfi1_error_port_qps(ibp, i);
                }
        }

        return __subn_get_opa_sl_to_sc(smp, am, data, ibdev, port, resp_len,
                                       max_len);
}

static int __subn_get_opa_sc_to_sl(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len)
{
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        u8 *p = data;
        size_t size = ARRAY_SIZE(ibp->sc_to_sl); /* == 32 */
        unsigned i;

        if (am || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        for (i = 0; i < ARRAY_SIZE(ibp->sc_to_sl); i++)
                *p++ = ibp->sc_to_sl[i];

        if (resp_len)
                *resp_len += size;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_sc_to_sl(struct opa_smp *smp, u32 am, u8 *data,
                                   struct ib_device *ibdev, u8 port,
                                   u32 *resp_len, u32 max_len)
{
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        size_t size = ARRAY_SIZE(ibp->sc_to_sl);
        u8 *p = data;
        int i;

        if (am || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        for (i = 0; i < ARRAY_SIZE(ibp->sc_to_sl); i++)
                ibp->sc_to_sl[i] = *p++;

        return __subn_get_opa_sc_to_sl(smp, am, data, ibdev, port, resp_len,
                                       max_len);
}

static int __subn_get_opa_sc_to_vlt(struct opa_smp *smp, u32 am, u8 *data,
                                    struct ib_device *ibdev, u8 port,
                                    u32 *resp_len, u32 max_len)
{
        u32 n_blocks = OPA_AM_NBLK(am);
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        void *vp = (void *)data;
        size_t size = 4 * sizeof(u64);

        if (n_blocks != 1 || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        get_sc2vlt_tables(dd, vp);

        if (resp_len)
                *resp_len += size;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_sc_to_vlt(struct opa_smp *smp, u32 am, u8 *data,
                                    struct ib_device *ibdev, u8 port,
                                    u32 *resp_len, u32 max_len)
{
        u32 n_blocks = OPA_AM_NBLK(am);
        int async_update = OPA_AM_ASYNC(am);
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        void *vp = (void *)data;
        struct hfi1_pportdata *ppd;
        int lstate;
        /*
         * set_sc2vlt_tables writes the information contained in *data
         * to four 64-bit registers SendSC2VLt[0-3]. We need to make
         * sure *max_len is not greater than the total size of the four
         * SendSC2VLt[0-3] registers.
         */
        size_t size = 4 * sizeof(u64);

        if (n_blocks != 1 || async_update || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        /* IB numbers ports from 1, hw from 0 */
        ppd = dd->pport + (port - 1);
        lstate = driver_lstate(ppd);
        /*
         * it's known that async_update is 0 by this point, but include
         * the explicit check for clarity
         */
        if (!async_update &&
            (lstate == IB_PORT_ARMED || lstate == IB_PORT_ACTIVE)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        set_sc2vlt_tables(dd, vp);

        return __subn_get_opa_sc_to_vlt(smp, am, data, ibdev, port, resp_len,
                                        max_len);
}

static int __subn_get_opa_sc_to_vlnt(struct opa_smp *smp, u32 am, u8 *data,
                                     struct ib_device *ibdev, u8 port,
                                     u32 *resp_len, u32 max_len)
{
        u32 n_blocks = OPA_AM_NPORT(am);
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct hfi1_pportdata *ppd;
        void *vp = (void *)data;
        int size = sizeof(struct sc2vlnt);

        if (n_blocks != 1 || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ppd = dd->pport + (port - 1);

        fm_get_table(ppd, FM_TBL_SC2VLNT, vp);

        if (resp_len)
                *resp_len += size;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_sc_to_vlnt(struct opa_smp *smp, u32 am, u8 *data,
                                     struct ib_device *ibdev, u8 port,
                                     u32 *resp_len, u32 max_len)
{
        u32 n_blocks = OPA_AM_NPORT(am);
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct hfi1_pportdata *ppd;
        void *vp = (void *)data;
        int lstate;
        int size = sizeof(struct sc2vlnt);

        if (n_blocks != 1 || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        /* IB numbers ports from 1, hw from 0 */
        ppd = dd->pport + (port - 1);
        lstate = driver_lstate(ppd);
        if (lstate == IB_PORT_ARMED || lstate == IB_PORT_ACTIVE) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ppd = dd->pport + (port - 1);

        fm_set_table(ppd, FM_TBL_SC2VLNT, vp);

        return __subn_get_opa_sc_to_vlnt(smp, am, data, ibdev, port,
                                         resp_len, max_len);
}

static int __subn_get_opa_psi(struct opa_smp *smp, u32 am, u8 *data,
                              struct ib_device *ibdev, u8 port,
                              u32 *resp_len, u32 max_len)
{
        u32 nports = OPA_AM_NPORT(am);
        u32 start_of_sm_config = OPA_AM_START_SM_CFG(am);
        u32 lstate;
        struct hfi1_ibport *ibp;
        struct hfi1_pportdata *ppd;
        struct opa_port_state_info *psi = (struct opa_port_state_info *)data;

        if (nports != 1 || smp_length_check(sizeof(*psi), max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ibp = to_iport(ibdev, port);
        ppd = ppd_from_ibp(ibp);

        lstate = driver_lstate(ppd);

        if (start_of_sm_config && (lstate == IB_PORT_INIT))
                ppd->is_sm_config_started = 1;

        psi->port_states.ledenable_offlinereason = ppd->neighbor_normal << 4;
        psi->port_states.ledenable_offlinereason |=
                ppd->is_sm_config_started << 5;
        psi->port_states.ledenable_offlinereason |=
                ppd->offline_disabled_reason;

        psi->port_states.portphysstate_portstate =
                (driver_pstate(ppd) << 4) | (lstate & 0xf);
        psi->link_width_downgrade_tx_active =
                cpu_to_be16(ppd->link_width_downgrade_tx_active);
        psi->link_width_downgrade_rx_active =
                cpu_to_be16(ppd->link_width_downgrade_rx_active);
        if (resp_len)
                *resp_len += sizeof(struct opa_port_state_info);

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_psi(struct opa_smp *smp, u32 am, u8 *data,
                              struct ib_device *ibdev, u8 port,
                              u32 *resp_len, u32 max_len, int local_mad)
{
        u32 nports = OPA_AM_NPORT(am);
        u32 start_of_sm_config = OPA_AM_START_SM_CFG(am);
        u32 ls_old;
        u8 ls_new, ps_new;
        struct hfi1_ibport *ibp;
        struct hfi1_pportdata *ppd;
        struct opa_port_state_info *psi = (struct opa_port_state_info *)data;
        int ret, invalid = 0;

        if (nports != 1 || smp_length_check(sizeof(*psi), max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ibp = to_iport(ibdev, port);
        ppd = ppd_from_ibp(ibp);

        ls_old = driver_lstate(ppd);

        ls_new = port_states_to_logical_state(&psi->port_states);
        ps_new = port_states_to_phys_state(&psi->port_states);

        if (ls_old == IB_PORT_INIT) {
                if (start_of_sm_config) {
                        if (ls_new == ls_old || (ls_new == IB_PORT_ARMED))
                                ppd->is_sm_config_started = 1;
                } else if (ls_new == IB_PORT_ARMED) {
                        if (ppd->is_sm_config_started == 0) {
                                invalid = 1;
                                smp->status |= IB_SMP_INVALID_FIELD;
                        }
                }
        }

        if (!invalid) {
                ret = set_port_states(ppd, smp, ls_new, ps_new, local_mad);
                if (ret)
                        return ret;
        }

        return __subn_get_opa_psi(smp, am, data, ibdev, port, resp_len,
                                  max_len);
}

static int __subn_get_opa_cable_info(struct opa_smp *smp, u32 am, u8 *data,
                                     struct ib_device *ibdev, u8 port,
                                     u32 *resp_len, u32 max_len)
{
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        u32 addr = OPA_AM_CI_ADDR(am);
        u32 len = OPA_AM_CI_LEN(am) + 1;
        int ret;

        if (dd->pport->port_type != PORT_TYPE_QSFP ||
            smp_length_check(len, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

#define __CI_PAGE_SIZE BIT(7) /* 128 bytes */
#define __CI_PAGE_MASK ~(__CI_PAGE_SIZE - 1)
#define __CI_PAGE_NUM(a) ((a) & __CI_PAGE_MASK)

        /*
         * check that addr is within spec, and
         * addr and (addr + len - 1) are on the same "page"
         */
        if (addr >= 4096 ||
            (__CI_PAGE_NUM(addr) != __CI_PAGE_NUM(addr + len - 1))) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ret = get_cable_info(dd, port, addr, len, data);

        if (ret == -ENODEV) {
                smp->status |= IB_SMP_UNSUP_METH_ATTR;
                return reply((struct ib_mad_hdr *)smp);
        }

        /* The address range for the CableInfo SMA query is wider than the
         * memory available on the QSFP cable. We want to return a valid
         * response, albeit zeroed out, for address ranges beyond available
         * memory but that are within the CableInfo query spec
         */
        if (ret < 0 && ret != -ERANGE) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        if (resp_len)
                *resp_len += len;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_get_opa_bct(struct opa_smp *smp, u32 am, u8 *data,
                              struct ib_device *ibdev, u8 port, u32 *resp_len,
                              u32 max_len)
{
        u32 num_ports = OPA_AM_NPORT(am);
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct hfi1_pportdata *ppd;
        struct buffer_control *p = (struct buffer_control *)data;
        int size = sizeof(struct buffer_control);

        if (num_ports != 1 || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        ppd = dd->pport + (port - 1);
        fm_get_table(ppd, FM_TBL_BUFFER_CONTROL, p);
        trace_bct_get(dd, p);
        if (resp_len)
                *resp_len += size;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_bct(struct opa_smp *smp, u32 am, u8 *data,
                              struct ib_device *ibdev, u8 port, u32 *resp_len,
                              u32 max_len)
{
        u32 num_ports = OPA_AM_NPORT(am);
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct hfi1_pportdata *ppd;
        struct buffer_control *p = (struct buffer_control *)data;

        if (num_ports != 1 || smp_length_check(sizeof(*p), max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }
        ppd = dd->pport + (port - 1);
        trace_bct_set(dd, p);
        if (fm_set_table(ppd, FM_TBL_BUFFER_CONTROL, p) < 0) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        return __subn_get_opa_bct(smp, am, data, ibdev, port, resp_len,
                                  max_len);
}

static int __subn_get_opa_vl_arb(struct opa_smp *smp, u32 am, u8 *data,
                                 struct ib_device *ibdev, u8 port,
                                 u32 *resp_len, u32 max_len)
{
        struct hfi1_pportdata *ppd = ppd_from_ibp(to_iport(ibdev, port));
        u32 num_ports = OPA_AM_NPORT(am);
        u8 section = (am & 0x00ff0000) >> 16;
        u8 *p = data;
        int size = 256;

        if (num_ports != 1 || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        switch (section) {
        case OPA_VLARB_LOW_ELEMENTS:
                fm_get_table(ppd, FM_TBL_VL_LOW_ARB, p);
                break;
        case OPA_VLARB_HIGH_ELEMENTS:
                fm_get_table(ppd, FM_TBL_VL_HIGH_ARB, p);
                break;
        case OPA_VLARB_PREEMPT_ELEMENTS:
                fm_get_table(ppd, FM_TBL_VL_PREEMPT_ELEMS, p);
                break;
        case OPA_VLARB_PREEMPT_MATRIX:
                fm_get_table(ppd, FM_TBL_VL_PREEMPT_MATRIX, p);
                break;
        default:
                pr_warn("OPA SubnGet(VL Arb) AM Invalid : 0x%x\n",
                        be32_to_cpu(smp->attr_mod));
                smp->status |= IB_SMP_INVALID_FIELD;
                size = 0;
                break;
        }

        if (size > 0 && resp_len)
                *resp_len += size;

        return reply((struct ib_mad_hdr *)smp);
}

static int __subn_set_opa_vl_arb(struct opa_smp *smp, u32 am, u8 *data,
                                 struct ib_device *ibdev, u8 port,
                                 u32 *resp_len, u32 max_len)
{
        struct hfi1_pportdata *ppd = ppd_from_ibp(to_iport(ibdev, port));
        u32 num_ports = OPA_AM_NPORT(am);
        u8 section = (am & 0x00ff0000) >> 16;
        u8 *p = data;
        int size = 256;

        if (num_ports != 1 || smp_length_check(size, max_len)) {
                smp->status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)smp);
        }

        switch (section) {
        case OPA_VLARB_LOW_ELEMENTS:
                (void)fm_set_table(ppd, FM_TBL_VL_LOW_ARB, p);
                break;
        case OPA_VLARB_HIGH_ELEMENTS:
                (void)fm_set_table(ppd, FM_TBL_VL_HIGH_ARB, p);
                break;
        /*
         * neither OPA_VLARB_PREEMPT_ELEMENTS, or OPA_VLARB_PREEMPT_MATRIX
         * can be changed from the default values
         */
        case OPA_VLARB_PREEMPT_ELEMENTS:
                /* FALLTHROUGH */
        case OPA_VLARB_PREEMPT_MATRIX:
                smp->status |= IB_SMP_UNSUP_METH_ATTR;
                break;
        default:
                pr_warn("OPA SubnSet(VL Arb) AM Invalid : 0x%x\n",
                        be32_to_cpu(smp->attr_mod));
                smp->status |= IB_SMP_INVALID_FIELD;
                break;
        }

        return __subn_get_opa_vl_arb(smp, am, data, ibdev, port, resp_len,
                                     max_len);
}

struct opa_pma_mad {
        struct ib_mad_hdr mad_hdr;
        u8 data[2024];
} __packed;

struct opa_port_status_req {
        __u8 port_num;
        __u8 reserved[3];
        __be32 vl_select_mask;
};

#define VL_MASK_ALL             0x00000000000080ffUL

struct opa_port_status_rsp {
        __u8 port_num;
        __u8 reserved[3];
        __be32  vl_select_mask;

        /* Data counters */
        __be64 port_xmit_data;
        __be64 port_rcv_data;
        __be64 port_xmit_pkts;
        __be64 port_rcv_pkts;
        __be64 port_multicast_xmit_pkts;
        __be64 port_multicast_rcv_pkts;
        __be64 port_xmit_wait;
        __be64 sw_port_congestion;
        __be64 port_rcv_fecn;
        __be64 port_rcv_becn;
        __be64 port_xmit_time_cong;
        __be64 port_xmit_wasted_bw;
        __be64 port_xmit_wait_data;
        __be64 port_rcv_bubble;
        __be64 port_mark_fecn;
        /* Error counters */
        __be64 port_rcv_constraint_errors;
        __be64 port_rcv_switch_relay_errors;
        __be64 port_xmit_discards;
        __be64 port_xmit_constraint_errors;
        __be64 port_rcv_remote_physical_errors;
        __be64 local_link_integrity_errors;
        __be64 port_rcv_errors;
        __be64 excessive_buffer_overruns;
        __be64 fm_config_errors;
        __be32 link_error_recovery;
        __be32 link_downed;
        u8 uncorrectable_errors;

        u8 link_quality_indicator; /* 5res, 3bit */
        u8 res2[6];
        struct _vls_pctrs {
                /* per-VL Data counters */
                __be64 port_vl_xmit_data;
                __be64 port_vl_rcv_data;
                __be64 port_vl_xmit_pkts;
                __be64 port_vl_rcv_pkts;
                __be64 port_vl_xmit_wait;
                __be64 sw_port_vl_congestion;
                __be64 port_vl_rcv_fecn;
                __be64 port_vl_rcv_becn;
                __be64 port_xmit_time_cong;
                __be64 port_vl_xmit_wasted_bw;
                __be64 port_vl_xmit_wait_data;
                __be64 port_vl_rcv_bubble;
                __be64 port_vl_mark_fecn;
                __be64 port_vl_xmit_discards;
        } vls[0]; /* real array size defined by # bits set in vl_select_mask */
};

enum counter_selects {
        CS_PORT_XMIT_DATA                       = (1 << 31),
        CS_PORT_RCV_DATA                        = (1 << 30),
        CS_PORT_XMIT_PKTS                       = (1 << 29),
        CS_PORT_RCV_PKTS                        = (1 << 28),
        CS_PORT_MCAST_XMIT_PKTS                 = (1 << 27),
        CS_PORT_MCAST_RCV_PKTS                  = (1 << 26),
        CS_PORT_XMIT_WAIT                       = (1 << 25),
        CS_SW_PORT_CONGESTION                   = (1 << 24),
        CS_PORT_RCV_FECN                        = (1 << 23),
        CS_PORT_RCV_BECN                        = (1 << 22),
        CS_PORT_XMIT_TIME_CONG                  = (1 << 21),
        CS_PORT_XMIT_WASTED_BW                  = (1 << 20),
        CS_PORT_XMIT_WAIT_DATA                  = (1 << 19),
        CS_PORT_RCV_BUBBLE                      = (1 << 18),
        CS_PORT_MARK_FECN                       = (1 << 17),
        CS_PORT_RCV_CONSTRAINT_ERRORS           = (1 << 16),
        CS_PORT_RCV_SWITCH_RELAY_ERRORS         = (1 << 15),
        CS_PORT_XMIT_DISCARDS                   = (1 << 14),
        CS_PORT_XMIT_CONSTRAINT_ERRORS          = (1 << 13),
        CS_PORT_RCV_REMOTE_PHYSICAL_ERRORS      = (1 << 12),
        CS_LOCAL_LINK_INTEGRITY_ERRORS          = (1 << 11),
        CS_PORT_RCV_ERRORS                      = (1 << 10),
        CS_EXCESSIVE_BUFFER_OVERRUNS            = (1 << 9),
        CS_FM_CONFIG_ERRORS                     = (1 << 8),
        CS_LINK_ERROR_RECOVERY                  = (1 << 7),
        CS_LINK_DOWNED                          = (1 << 6),
        CS_UNCORRECTABLE_ERRORS                 = (1 << 5),
};

struct opa_clear_port_status {
        __be64 port_select_mask[4];
        __be32 counter_select_mask;
};

struct opa_aggregate {
        __be16 attr_id;
        __be16 err_reqlength;   /* 1 bit, 8 res, 7 bit */
        __be32 attr_mod;
        u8 data[0];
};

#define MSK_LLI 0x000000f0
#define MSK_LLI_SFT 4
#define MSK_LER 0x0000000f
#define MSK_LER_SFT 0
#define ADD_LLI 8
#define ADD_LER 2

/* Request contains first three fields, response contains those plus the rest */
struct opa_port_data_counters_msg {
        __be64 port_select_mask[4];
        __be32 vl_select_mask;
        __be32 resolution;

        /* Response fields follow */
        struct _port_dctrs {
                u8 port_number;
                u8 reserved2[3];
                __be32 link_quality_indicator; /* 29res, 3bit */

                /* Data counters */
                __be64 port_xmit_data;
                __be64 port_rcv_data;
                __be64 port_xmit_pkts;
                __be64 port_rcv_pkts;
                __be64 port_multicast_xmit_pkts;
                __be64 port_multicast_rcv_pkts;
                __be64 port_xmit_wait;
                __be64 sw_port_congestion;
                __be64 port_rcv_fecn;
                __be64 port_rcv_becn;
                __be64 port_xmit_time_cong;
                __be64 port_xmit_wasted_bw;
                __be64 port_xmit_wait_data;
                __be64 port_rcv_bubble;
                __be64 port_mark_fecn;

                __be64 port_error_counter_summary;
                /* Sum of error counts/port */

                struct _vls_dctrs {
                        /* per-VL Data counters */
                        __be64 port_vl_xmit_data;
                        __be64 port_vl_rcv_data;
                        __be64 port_vl_xmit_pkts;
                        __be64 port_vl_rcv_pkts;
                        __be64 port_vl_xmit_wait;
                        __be64 sw_port_vl_congestion;
                        __be64 port_vl_rcv_fecn;
                        __be64 port_vl_rcv_becn;
                        __be64 port_xmit_time_cong;
                        __be64 port_vl_xmit_wasted_bw;
                        __be64 port_vl_xmit_wait_data;
                        __be64 port_vl_rcv_bubble;
                        __be64 port_vl_mark_fecn;
                } vls[0];
                /* array size defined by #bits set in vl_select_mask*/
        } port[1]; /* array size defined by  #ports in attribute modifier */
};

struct opa_port_error_counters64_msg {
        /*
         * Request contains first two fields, response contains the
         * whole magilla
         */
        __be64 port_select_mask[4];
        __be32 vl_select_mask;

        /* Response-only fields follow */
        __be32 reserved1;
        struct _port_ectrs {
                u8 port_number;
                u8 reserved2[7];
                __be64 port_rcv_constraint_errors;
                __be64 port_rcv_switch_relay_errors;
                __be64 port_xmit_discards;
                __be64 port_xmit_constraint_errors;
                __be64 port_rcv_remote_physical_errors;
                __be64 local_link_integrity_errors;
                __be64 port_rcv_errors;
                __be64 excessive_buffer_overruns;
                __be64 fm_config_errors;
                __be32 link_error_recovery;
                __be32 link_downed;
                u8 uncorrectable_errors;
                u8 reserved3[7];
                struct _vls_ectrs {
                        __be64 port_vl_xmit_discards;
                } vls[0];
                /* array size defined by #bits set in vl_select_mask */
        } port[1]; /* array size defined by #ports in attribute modifier */
};

struct opa_port_error_info_msg {
        __be64 port_select_mask[4];
        __be32 error_info_select_mask;
        __be32 reserved1;
        struct _port_ei {
                u8 port_number;
                u8 reserved2[7];

                /* PortRcvErrorInfo */
                struct {
                        u8 status_and_code;
                        union {
                                u8 raw[17];
                                struct {
                                        /* EI1to12 format */
                                        u8 packet_flit1[8];
                                        u8 packet_flit2[8];
                                        u8 remaining_flit_bits12;
                                } ei1to12;
                                struct {
                                        u8 packet_bytes[8];
                                        u8 remaining_flit_bits;
                                } ei13;
                        } ei;
                        u8 reserved3[6];
                } __packed port_rcv_ei;

                /* ExcessiveBufferOverrunInfo */
                struct {
                        u8 status_and_sc;
                        u8 reserved4[7];
                } __packed excessive_buffer_overrun_ei;

                /* PortXmitConstraintErrorInfo */
                struct {
                        u8 status;
                        u8 reserved5;
                        __be16 pkey;
                        __be32 slid;
                } __packed port_xmit_constraint_ei;

                /* PortRcvConstraintErrorInfo */
                struct {
                        u8 status;
                        u8 reserved6;
                        __be16 pkey;
                        __be32 slid;
                } __packed port_rcv_constraint_ei;

                /* PortRcvSwitchRelayErrorInfo */
                struct {
                        u8 status_and_code;
                        u8 reserved7[3];
                        __u32 error_info;
                } __packed port_rcv_switch_relay_ei;

                /* UncorrectableErrorInfo */
                struct {
                        u8 status_and_code;
                        u8 reserved8;
                } __packed uncorrectable_ei;

                /* FMConfigErrorInfo */
                struct {
                        u8 status_and_code;
                        u8 error_info;
                } __packed fm_config_ei;
                __u32 reserved9;
        } port[1]; /* actual array size defined by #ports in attr modifier */
};

/* opa_port_error_info_msg error_info_select_mask bit definitions */
enum error_info_selects {
        ES_PORT_RCV_ERROR_INFO                  = (1 << 31),
        ES_EXCESSIVE_BUFFER_OVERRUN_INFO        = (1 << 30),
        ES_PORT_XMIT_CONSTRAINT_ERROR_INFO      = (1 << 29),
        ES_PORT_RCV_CONSTRAINT_ERROR_INFO       = (1 << 28),
        ES_PORT_RCV_SWITCH_RELAY_ERROR_INFO     = (1 << 27),
        ES_UNCORRECTABLE_ERROR_INFO             = (1 << 26),
        ES_FM_CONFIG_ERROR_INFO                 = (1 << 25)
};

static int pma_get_opa_classportinfo(struct opa_pma_mad *pmp,
                                     struct ib_device *ibdev, u32 *resp_len)
{
        struct opa_class_port_info *p =
                (struct opa_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;

        p->base_version = OPA_MGMT_BASE_VERSION;
        p->class_version = OPA_SM_CLASS_VERSION;
        /*
         * Expected response time is 4.096 usec. * 2^18 == 1.073741824 sec.
         */
        p->cap_mask2_resp_time = cpu_to_be32(18);

        if (resp_len)
                *resp_len += sizeof(*p);

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

static void a0_portstatus(struct hfi1_pportdata *ppd,
                          struct opa_port_status_rsp *rsp)
{
        if (!is_bx(ppd->dd)) {
                unsigned long vl;
                u64 sum_vl_xmit_wait = 0;
                unsigned long vl_all_mask = VL_MASK_ALL;

                for_each_set_bit(vl, &vl_all_mask, BITS_PER_LONG) {
                        u64 tmp = sum_vl_xmit_wait +
                                  read_port_cntr(ppd, C_TX_WAIT_VL,
                                                 idx_from_vl(vl));
                        if (tmp < sum_vl_xmit_wait) {
                                /* we wrapped */
                                sum_vl_xmit_wait = (u64)~0;
                                break;
                        }
                        sum_vl_xmit_wait = tmp;
                }
                if (be64_to_cpu(rsp->port_xmit_wait) > sum_vl_xmit_wait)
                        rsp->port_xmit_wait = cpu_to_be64(sum_vl_xmit_wait);
        }
}

/**
 * tx_link_width - convert link width bitmask to integer
 * value representing actual link width.
 * @link_width: width of active link
 * @return: return index of the bit set in link_width var
 *
 * The function convert and return the index of bit set
 * that indicate the current link width.
 */
u16 tx_link_width(u16 link_width)
{
        int n = LINK_WIDTH_DEFAULT;
        u16 tx_width = n;

        while (link_width && n) {
                if (link_width & (1 << (n - 1))) {
                        tx_width = n;
                        break;
                }
                n--;
        }

        return tx_width;
}

/**
 * get_xmit_wait_counters - Convert HFI 's SendWaitCnt/SendWaitVlCnt
 * counter in unit of TXE cycle times to flit times.
 * @ppd: info of physical Hfi port
 * @link_width: width of active link
 * @link_speed: speed of active link
 * @vl: represent VL0-VL7, VL15 for PortVLXmitWait counters request
 * and if vl value is C_VL_COUNT, it represent SendWaitCnt
 * counter request
 * @return: return SendWaitCnt/SendWaitVlCnt counter value per vl.
 *
 * Convert SendWaitCnt/SendWaitVlCnt counter from TXE cycle times to
 * flit times. Call this function to samples these counters. This
 * function will calculate for previous state transition and update
 * current state at end of function using ppd->prev_link_width and
 * ppd->port_vl_xmit_wait_last to port_vl_xmit_wait_curr and link_width.
 */
u64 get_xmit_wait_counters(struct hfi1_pportdata *ppd,
                           u16 link_width, u16 link_speed, int vl)
{
        u64 port_vl_xmit_wait_curr;
        u64 delta_vl_xmit_wait;
        u64 xmit_wait_val;

        if (vl > C_VL_COUNT)
                return  0;
        if (vl < C_VL_COUNT)
                port_vl_xmit_wait_curr =
                        read_port_cntr(ppd, C_TX_WAIT_VL, vl);
        else
                port_vl_xmit_wait_curr =
                        read_port_cntr(ppd, C_TX_WAIT, CNTR_INVALID_VL);

        xmit_wait_val =
                port_vl_xmit_wait_curr -
                ppd->port_vl_xmit_wait_last[vl];
        delta_vl_xmit_wait =
                convert_xmit_counter(xmit_wait_val,
                                     ppd->prev_link_width,
                                     link_speed);

        ppd->vl_xmit_flit_cnt[vl] += delta_vl_xmit_wait;
        ppd->port_vl_xmit_wait_last[vl] = port_vl_xmit_wait_curr;
        ppd->prev_link_width = link_width;

        return ppd->vl_xmit_flit_cnt[vl];
}

static int pma_get_opa_portstatus(struct opa_pma_mad *pmp,
                                  struct ib_device *ibdev,
                                  u8 port, u32 *resp_len)
{
        struct opa_port_status_req *req =
                (struct opa_port_status_req *)pmp->data;
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct opa_port_status_rsp *rsp;
        unsigned long vl_select_mask = be32_to_cpu(req->vl_select_mask);
        unsigned long vl;
        size_t response_data_size;
        u32 nports = be32_to_cpu(pmp->mad_hdr.attr_mod) >> 24;
        u8 port_num = req->port_num;
        u8 num_vls = hweight64(vl_select_mask);
        struct _vls_pctrs *vlinfo;
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
        int vfi;
        u64 tmp, tmp2;
        u16 link_width;
        u16 link_speed;

        response_data_size = struct_size(rsp, vls, num_vls);
        if (response_data_size > sizeof(pmp->data)) {
                pmp->mad_hdr.status |= OPA_PM_STATUS_REQUEST_TOO_LARGE;
                return reply((struct ib_mad_hdr *)pmp);
        }

        if (nports != 1 || (port_num && port_num != port) ||
            num_vls > OPA_MAX_VLS || (vl_select_mask & ~VL_MASK_ALL)) {
                pmp->mad_hdr.status |= IB_SMP_INVALID_FIELD;
                return reply((struct ib_mad_hdr *)pmp);
        }

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

        rsp = (struct opa_port_status_rsp *)pmp->data;
        if (port_num)
                rsp->port_num = port_num;
        else
                rsp->port_num = port;

        rsp->port_rcv_constraint_errors =
                cpu_to_be64(read_port_cntr(ppd, C_SW_RCV_CSTR_ERR,
                                           CNTR_INVALID_VL));

        hfi1_read_link_quality(dd, &rsp->link_quality_indicator);

        rsp->vl_select_mask = cpu_to_be32((u32)vl_select_mask);
        rsp->port_xmit_data = cpu_to_be64(read_dev_cntr(dd, C_DC_XMIT_FLITS,
                                          CNTR_INVALID_VL));
        rsp->port_rcv_data = cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_FLITS,
                                         CNTR_INVALID_VL));
        rsp->port_xmit_pkts = cpu_to_be64(read_dev_cntr(dd, C_DC_XMIT_PKTS,
                                          CNTR_INVALID_VL));
        rsp->port_rcv_pkts = cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_PKTS,
                                         CNTR_INVALID_VL));
        rsp->port_multicast_xmit_pkts =
                cpu_to_be64(read_dev_cntr(dd, C_DC_MC_XMIT_PKTS,
                                          CNTR_INVALID_VL));
        rsp->port_multicast_rcv_pkts =
                cpu_to_be64(read_dev_cntr(dd, C_DC_MC_RCV_PKTS,
                                          CNTR_INVALID_VL));
        /*
         * Convert PortXmitWait counter from TXE cycle times
         * to flit times.
         */
        link_width =
                tx_link_width(ppd->link_width_downgrade_tx_active);
        link_speed = get_link_speed(ppd->link_speed_active);
        rsp->port_xmit_wait =
                cpu_to_be64(get_xmit_wait_counters(ppd, link_width,
                                                   link_speed, C_VL_COUNT));
        rsp->port_rcv_fecn =
                cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_FCN, CNTR_INVALID_VL));
        rsp->port_rcv_becn =
                cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_BCN, CNTR_INVALID_VL));
        rsp->port_xmit_discards =
                cpu_to_be64(read_port_cntr(ppd, C_SW_XMIT_DSCD,
                                           CNTR_INVALID_VL));
        rsp->port_xmit_constraint_errors =
                cpu_to_be64(read_port_cntr(ppd, C_SW_XMIT_CSTR_ERR,
                                           CNTR_INVALID_VL));
        rsp->port_rcv_remote_physical_errors =
                cpu_to_be64(read_dev_cntr(dd, C_DC_RMT_PHY_ERR,
                                          CNTR_INVALID_VL));
        rsp->local_link_integrity_errors =
                cpu_to_be64(read_dev_cntr(dd, C_DC_RX_REPLAY,
                                          CNTR_INVALID_VL));
        tmp = read_dev_cntr(dd, C_DC_SEQ_CRC_CNT, CNTR_INVALID_VL);
        tmp2 = tmp + read_dev_cntr(dd, C_DC_REINIT_FROM_PEER_CNT,
                                   CNTR_INVALID_VL);
        if (tmp2 > (u32)UINT_MAX || tmp2 < tmp) {
                /* overflow/wrapped */
                rsp->link_error_recovery = cpu_to_be32(~0);
        } else {
                rsp->link_error_recovery = cpu_to_be32(tmp2);
        }
        rsp->port_rcv_errors =
                cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_ERR, CNTR_INVALID_VL));
        rsp->excessive_buffer_overruns =
                cpu_to_be64(read_dev_cntr(dd, C_RCV_OVF, CNTR_INVALID_VL));
        rsp->fm_config_errors =
                cpu_to_be64(read_dev_cntr(dd, C_DC_FM_CFG_ERR,
                                          CNTR_INVALID_VL));
        rsp->link_downed = cpu_to_be32(read_port_cntr(ppd, C_SW_LINK_DOWN,
                                                      CNTR_INVALID_VL));

        /* rsp->uncorrectable_errors is 8 bits wide, and it pegs at 0xff */
        tmp = read_dev_cntr(dd, C_DC_UNC_ERR, CNTR_INVALID_VL);
        rsp->uncorrectable_errors = tmp < 0x100 ? (tmp & 0xff) : 0xff;

        vlinfo = &rsp->vls[0];
        vfi = 0;
        /* The vl_select_mask has been checked above, and we know
         * that it contains only entries which represent valid VLs.
         * So in the for_each_set_bit() loop below, we don't need
         * any additional checks for vl.
         */
        for_each_set_bit(vl, &vl_select_mask, BITS_PER_LONG) {
                memset(vlinfo, 0, sizeof(*vlinfo));

                tmp = read_dev_cntr(dd, C_DC_RX_FLIT_VL, idx_from_vl(vl));
                rsp->vls[vfi].port_vl_rcv_data = cpu_to_be64(tmp);

                rsp->vls[vfi].port_vl_rcv_pkts =
                        cpu_to_be64(read_dev_cntr(dd, C_DC_RX_PKT_VL,
                                                  idx_from_vl(vl)));

                rsp->vls[vfi].port_vl_xmit_data =
                        cpu_to_be64(read_port_cntr(ppd, C_TX_FLIT_VL,
                                                   idx_from_vl(vl)));

                rsp->vls[vfi].port_vl_xmit_pkts =
                        cpu_to_be64(read_port_cntr(ppd, C_TX_PKT_VL,
                                                   idx_from_vl(vl)));
                /*
                 * Convert PortVlXmitWait counter from TXE cycle
                 * times to flit times.
                 */
                rsp->vls[vfi].port_vl_xmit_wait =
                        cpu_to_be64(get_xmit_wait_counters(ppd, link_width,
                                                           link_speed,
                                                           idx_from_vl(vl)));

                rsp->vls[vfi].port_vl_rcv_fecn =
                        cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_FCN_VL,
                                                  idx_from_vl(vl)));

                rsp->vls[vfi].port_vl_rcv_becn =
                        cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_BCN_VL,
                                                  idx_from_vl(vl)));

                rsp->vls[vfi].port_vl_xmit_discards =
                        cpu_to_be64(read_port_cntr(ppd, C_SW_XMIT_DSCD_VL,
                                                   idx_from_vl(vl)));
                vlinfo++;
                vfi++;
        }

        a0_portstatus(ppd, rsp);

        if (resp_len)
                *resp_len += response_data_size;

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

static u64 get_error_counter_summary(struct ib_device *ibdev, u8 port,
                                     u8 res_lli, u8 res_ler)
{
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
        u64 error_counter_summary = 0, tmp;

        error_counter_summary += read_port_cntr(ppd, C_SW_RCV_CSTR_ERR,
                                                CNTR_INVALID_VL);
        /* port_rcv_switch_relay_errors is 0 for HFIs */
        error_counter_summary += read_port_cntr(ppd, C_SW_XMIT_DSCD,
                                                CNTR_INVALID_VL);
        error_counter_summary += read_port_cntr(ppd, C_SW_XMIT_CSTR_ERR,
                                                CNTR_INVALID_VL);
        error_counter_summary += read_dev_cntr(dd, C_DC_RMT_PHY_ERR,
                                               CNTR_INVALID_VL);
        /* local link integrity must be right-shifted by the lli resolution */
        error_counter_summary += (read_dev_cntr(dd, C_DC_RX_REPLAY,
                                                CNTR_INVALID_VL) >> res_lli);
        /* link error recovery must b right-shifted by the ler resolution */
        tmp = read_dev_cntr(dd, C_DC_SEQ_CRC_CNT, CNTR_INVALID_VL);
        tmp += read_dev_cntr(dd, C_DC_REINIT_FROM_PEER_CNT, CNTR_INVALID_VL);
        error_counter_summary += (tmp >> res_ler);
        error_counter_summary += read_dev_cntr(dd, C_DC_RCV_ERR,
                                               CNTR_INVALID_VL);
        error_counter_summary += read_dev_cntr(dd, C_RCV_OVF, CNTR_INVALID_VL);
        error_counter_summary += read_dev_cntr(dd, C_DC_FM_CFG_ERR,
                                               CNTR_INVALID_VL);
        /* ppd->link_downed is a 32-bit value */
        error_counter_summary += read_port_cntr(ppd, C_SW_LINK_DOWN,
                                                CNTR_INVALID_VL);
        tmp = read_dev_cntr(dd, C_DC_UNC_ERR, CNTR_INVALID_VL);
        /* this is an 8-bit quantity */
        error_counter_summary += tmp < 0x100 ? (tmp & 0xff) : 0xff;

        return error_counter_summary;
}

static void a0_datacounters(struct hfi1_pportdata *ppd, struct _port_dctrs *rsp)
{
        if (!is_bx(ppd->dd)) {
                unsigned long vl;
                u64 sum_vl_xmit_wait = 0;
                unsigned long vl_all_mask = VL_MASK_ALL;

                for_each_set_bit(vl, &vl_all_mask, BITS_PER_LONG) {
                        u64 tmp = sum_vl_xmit_wait +
                                  read_port_cntr(ppd, C_TX_WAIT_VL,
                                                 idx_from_vl(vl));
                        if (tmp < sum_vl_xmit_wait) {
                                /* we wrapped */
                                sum_vl_xmit_wait = (u64)~0;
                                break;
                        }
                        sum_vl_xmit_wait = tmp;
                }
                if (be64_to_cpu(rsp->port_xmit_wait) > sum_vl_xmit_wait)
                        rsp->port_xmit_wait = cpu_to_be64(sum_vl_xmit_wait);
        }
}

static void pma_get_opa_port_dctrs(struct ib_device *ibdev,
                                   struct _port_dctrs *rsp)
{
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);

        rsp->port_xmit_data = cpu_to_be64(read_dev_cntr(dd, C_DC_XMIT_FLITS,
                                                CNTR_INVALID_VL));
        rsp->port_rcv_data = cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_FLITS,
                                                CNTR_INVALID_VL));
        rsp->port_xmit_pkts = cpu_to_be64(read_dev_cntr(dd, C_DC_XMIT_PKTS,
                                                CNTR_INVALID_VL));
        rsp->port_rcv_pkts = cpu_to_be64(read_dev_cntr(dd, C_DC_RCV_PKTS,
                                                CNTR_INVALID_VL));
        rsp->port_multicast_xmit_pkts =
                cpu_to_be64(read_dev_cntr(dd, C_DC_MC_XMIT_PKTS,
                                          CNTR_INVALID_VL));
        rsp->port_multicast_rcv_pkts =
                cpu_to_be64(read_dev_cntr(dd, C_DC_MC_RCV_PKTS,
                                          CNTR_INVALID_VL));
}

static int pma_get_opa_datacounters(struct opa_pma_mad *pmp,
                                    struct ib_device *ibdev,
                                    u8 port, u32 *resp_len)
{
        struct opa_port_data_counters_msg *req =
                (struct opa_port_data_counters_msg *)pmp->data;
        struct hfi1_devdata *dd = dd_from_ibdev(ibdev);
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
        struct _port_dctrs *rsp;
        struct _vls_dctrs *vlinfo;
        size_t response_data_size;
        u32 num_ports;
        u8 lq, num_vls;
        u8 res_lli, res_ler;
        u64 port_mask;
        u8 port_num;
        unsigned long vl;
        unsigned long vl_select_mask;
        int vfi;
        u16 link_width;
        u16 link_speed;

        num_ports = be32_to_cpu(pmp->mad_hdr.attr_mod) >> 24;
        num_vls = hweight32(be32_to_cpu(req->vl_select_mask));
        vl_select_mask = be32_to_cpu(req->vl_select_mask);