/*
 * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/addrconf.h>
#include <linux/security.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_addr.h>
#include <rdma/rw.h>

#include "core_priv.h"

static int ib_resolve_eth_dmac(struct ib_device *device,
                               struct rdma_ah_attr *ah_attr);

static const char * const ib_events[] = {
        [IB_EVENT_CQ_ERR]               = "CQ error",
        [IB_EVENT_QP_FATAL]             = "QP fatal error",
        [IB_EVENT_QP_REQ_ERR]           = "QP request error",
        [IB_EVENT_QP_ACCESS_ERR]        = "QP access error",
        [IB_EVENT_COMM_EST]             = "communication established",
        [IB_EVENT_SQ_DRAINED]           = "send queue drained",
        [IB_EVENT_PATH_MIG]             = "path migration successful",
        [IB_EVENT_PATH_MIG_ERR]         = "path migration error",
        [IB_EVENT_DEVICE_FATAL]         = "device fatal error",
        [IB_EVENT_PORT_ACTIVE]          = "port active",
        [IB_EVENT_PORT_ERR]             = "port error",
        [IB_EVENT_LID_CHANGE]           = "LID change",
        [IB_EVENT_PKEY_CHANGE]          = "P_key change",
        [IB_EVENT_SM_CHANGE]            = "SM change",
        [IB_EVENT_SRQ_ERR]              = "SRQ error",
        [IB_EVENT_SRQ_LIMIT_REACHED]    = "SRQ limit reached",
        [IB_EVENT_QP_LAST_WQE_REACHED]  = "last WQE reached",
        [IB_EVENT_CLIENT_REREGISTER]    = "client reregister",
        [IB_EVENT_GID_CHANGE]           = "GID changed",
};

const char *__attribute_const__ ib_event_msg(enum ib_event_type event)
{
        size_t index = event;

        return (index < ARRAY_SIZE(ib_events) && ib_events[index]) ?
                        ib_events[index] : "unrecognized event";
}
EXPORT_SYMBOL(ib_event_msg);

static const char * const wc_statuses[] = {
        [IB_WC_SUCCESS]                 = "success",
        [IB_WC_LOC_LEN_ERR]             = "local length error",
        [IB_WC_LOC_QP_OP_ERR]           = "local QP operation error",
        [IB_WC_LOC_EEC_OP_ERR]          = "local EE context operation error",
        [IB_WC_LOC_PROT_ERR]            = "local protection error",
        [IB_WC_WR_FLUSH_ERR]            = "WR flushed",
        [IB_WC_MW_BIND_ERR]             = "memory management operation error",
        [IB_WC_BAD_RESP_ERR]            = "bad response error",
        [IB_WC_LOC_ACCESS_ERR]          = "local access error",
        [IB_WC_REM_INV_REQ_ERR]         = "invalid request error",
        [IB_WC_REM_ACCESS_ERR]          = "remote access error",
        [IB_WC_REM_OP_ERR]              = "remote operation error",
        [IB_WC_RETRY_EXC_ERR]           = "transport retry counter exceeded",
        [IB_WC_RNR_RETRY_EXC_ERR]       = "RNR retry counter exceeded",
        [IB_WC_LOC_RDD_VIOL_ERR]        = "local RDD violation error",
        [IB_WC_REM_INV_RD_REQ_ERR]      = "remote invalid RD request",
        [IB_WC_REM_ABORT_ERR]           = "operation aborted",
        [IB_WC_INV_EECN_ERR]            = "invalid EE context number",
        [IB_WC_INV_EEC_STATE_ERR]       = "invalid EE context state",
        [IB_WC_FATAL_ERR]               = "fatal error",
        [IB_WC_RESP_TIMEOUT_ERR]        = "response timeout error",
        [IB_WC_GENERAL_ERR]             = "general error",
};

const char *__attribute_const__ ib_wc_status_msg(enum ib_wc_status status)
{
        size_t index = status;

        return (index < ARRAY_SIZE(wc_statuses) && wc_statuses[index]) ?
                        wc_statuses[index] : "unrecognized status";
}
EXPORT_SYMBOL(ib_wc_status_msg);

__attribute_const__ int ib_rate_to_mult(enum ib_rate rate)
{
        switch (rate) {
        case IB_RATE_2_5_GBPS: return   1;
        case IB_RATE_5_GBPS:   return   2;
        case IB_RATE_10_GBPS:  return   4;
        case IB_RATE_20_GBPS:  return   8;
        case IB_RATE_30_GBPS:  return  12;
        case IB_RATE_40_GBPS:  return  16;
        case IB_RATE_60_GBPS:  return  24;
        case IB_RATE_80_GBPS:  return  32;
        case IB_RATE_120_GBPS: return  48;
        case IB_RATE_14_GBPS:  return   6;
        case IB_RATE_56_GBPS:  return  22;
        case IB_RATE_112_GBPS: return  45;
        case IB_RATE_168_GBPS: return  67;
        case IB_RATE_25_GBPS:  return  10;
        case IB_RATE_100_GBPS: return  40;
        case IB_RATE_200_GBPS: return  80;
        case IB_RATE_300_GBPS: return 120;
        case IB_RATE_28_GBPS:  return  11;
        case IB_RATE_50_GBPS:  return  20;
        case IB_RATE_400_GBPS: return 160;
        case IB_RATE_600_GBPS: return 240;
        default:               return  -1;
        }
}
EXPORT_SYMBOL(ib_rate_to_mult);

__attribute_const__ enum ib_rate mult_to_ib_rate(int mult)
{
        switch (mult) {
        case 1:   return IB_RATE_2_5_GBPS;
        case 2:   return IB_RATE_5_GBPS;
        case 4:   return IB_RATE_10_GBPS;
        case 8:   return IB_RATE_20_GBPS;
        case 12:  return IB_RATE_30_GBPS;
        case 16:  return IB_RATE_40_GBPS;
        case 24:  return IB_RATE_60_GBPS;
        case 32:  return IB_RATE_80_GBPS;
        case 48:  return IB_RATE_120_GBPS;
        case 6:   return IB_RATE_14_GBPS;
        case 22:  return IB_RATE_56_GBPS;
        case 45:  return IB_RATE_112_GBPS;
        case 67:  return IB_RATE_168_GBPS;
        case 10:  return IB_RATE_25_GBPS;
        case 40:  return IB_RATE_100_GBPS;
        case 80:  return IB_RATE_200_GBPS;
        case 120: return IB_RATE_300_GBPS;
        case 11:  return IB_RATE_28_GBPS;
        case 20:  return IB_RATE_50_GBPS;
        case 160: return IB_RATE_400_GBPS;
        case 240: return IB_RATE_600_GBPS;
        default:  return IB_RATE_PORT_CURRENT;
        }
}
EXPORT_SYMBOL(mult_to_ib_rate);

__attribute_const__ int ib_rate_to_mbps(enum ib_rate rate)
{
        switch (rate) {
        case IB_RATE_2_5_GBPS: return 2500;
        case IB_RATE_5_GBPS:   return 5000;
        case IB_RATE_10_GBPS:  return 10000;
        case IB_RATE_20_GBPS:  return 20000;
        case IB_RATE_30_GBPS:  return 30000;
        case IB_RATE_40_GBPS:  return 40000;
        case IB_RATE_60_GBPS:  return 60000;
        case IB_RATE_80_GBPS:  return 80000;
        case IB_RATE_120_GBPS: return 120000;
        case IB_RATE_14_GBPS:  return 14062;
        case IB_RATE_56_GBPS:  return 56250;
        case IB_RATE_112_GBPS: return 112500;
        case IB_RATE_168_GBPS: return 168750;
        case IB_RATE_25_GBPS:  return 25781;
        case IB_RATE_100_GBPS: return 103125;
        case IB_RATE_200_GBPS: return 206250;
        case IB_RATE_300_GBPS: return 309375;
        case IB_RATE_28_GBPS:  return 28125;
        case IB_RATE_50_GBPS:  return 53125;
        case IB_RATE_400_GBPS: return 425000;
        case IB_RATE_600_GBPS: return 637500;
        default:               return -1;
        }
}
EXPORT_SYMBOL(ib_rate_to_mbps);

__attribute_const__ enum rdma_transport_type
rdma_node_get_transport(unsigned int node_type)
{

        if (node_type == RDMA_NODE_USNIC)
                return RDMA_TRANSPORT_USNIC;
        if (node_type == RDMA_NODE_USNIC_UDP)
                return RDMA_TRANSPORT_USNIC_UDP;
        if (node_type == RDMA_NODE_RNIC)
                return RDMA_TRANSPORT_IWARP;
        if (node_type == RDMA_NODE_UNSPECIFIED)
                return RDMA_TRANSPORT_UNSPECIFIED;

        return RDMA_TRANSPORT_IB;
}
EXPORT_SYMBOL(rdma_node_get_transport);

enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device, u8 port_num)
{
        enum rdma_transport_type lt;
        if (device->ops.get_link_layer)
                return device->ops.get_link_layer(device, port_num);

        lt = rdma_node_get_transport(device->node_type);
        if (lt == RDMA_TRANSPORT_IB)
                return IB_LINK_LAYER_INFINIBAND;

        return IB_LINK_LAYER_ETHERNET;
}
EXPORT_SYMBOL(rdma_port_get_link_layer);

/* Protection domains */

/**
 * ib_alloc_pd - Allocates an unused protection domain.
 * @device: The device on which to allocate the protection domain.
 *
 * A protection domain object provides an association between QPs, shared
 * receive queues, address handles, memory regions, and memory windows.
 *
 * Every PD has a local_dma_lkey which can be used as the lkey value for local
 * memory operations.
 */
struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags,
                const char *caller)
{
        struct ib_pd *pd;
        int mr_access_flags = 0;
        int ret;

        pd = rdma_zalloc_drv_obj(device, ib_pd);
        if (!pd)
                return ERR_PTR(-ENOMEM);

        pd->device = device;
        pd->uobject = NULL;
        pd->__internal_mr = NULL;
        atomic_set(&pd->usecnt, 0);
        pd->flags = flags;

        pd->res.type = RDMA_RESTRACK_PD;
        rdma_restrack_set_task(&pd->res, caller);

        ret = device->ops.alloc_pd(pd, NULL);
        if (ret) {
                kfree(pd);
                return ERR_PTR(ret);
        }
        rdma_restrack_kadd(&pd->res);

        if (device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
                pd->local_dma_lkey = device->local_dma_lkey;
        else
                mr_access_flags |= IB_ACCESS_LOCAL_WRITE;

        if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
                pr_warn("%s: enabling unsafe global rkey\n", caller);
                mr_access_flags |= IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE;
        }

        if (mr_access_flags) {
                struct ib_mr *mr;

                mr = pd->device->ops.get_dma_mr(pd, mr_access_flags);
                if (IS_ERR(mr)) {
                        ib_dealloc_pd(pd);
                        return ERR_CAST(mr);
                }

                mr->device      = pd->device;
                mr->pd          = pd;
                mr->type        = IB_MR_TYPE_DMA;
                mr->uobject     = NULL;
                mr->need_inval  = false;

                pd->__internal_mr = mr;

                if (!(device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY))
                        pd->local_dma_lkey = pd->__internal_mr->lkey;

                if (flags & IB_PD_UNSAFE_GLOBAL_RKEY)
                        pd->unsafe_global_rkey = pd->__internal_mr->rkey;
        }

        return pd;
}
EXPORT_SYMBOL(__ib_alloc_pd);

/**
 * ib_dealloc_pd_user - Deallocates a protection domain.
 * @pd: The protection domain to deallocate.
 * @udata: Valid user data or NULL for kernel object
 *
 * It is an error to call this function while any resources in the pd still
 * exist.  The caller is responsible to synchronously destroy them and
 * guarantee no new allocations will happen.
 */
void ib_dealloc_pd_user(struct ib_pd *pd, struct ib_udata *udata)
{
        int ret;

        if (pd->__internal_mr) {
                ret = pd->device->ops.dereg_mr(pd->__internal_mr, NULL);
                WARN_ON(ret);
                pd->__internal_mr = NULL;
        }

        /* uverbs manipulates usecnt with proper locking, while the kabi
           requires the caller to guarantee we can't race here. */
        WARN_ON(atomic_read(&pd->usecnt));

        rdma_restrack_del(&pd->res);
        pd->device->ops.dealloc_pd(pd, udata);
        kfree(pd);
}
EXPORT_SYMBOL(ib_dealloc_pd_user);

/* Address handles */

/**
 * rdma_copy_ah_attr - Copy rdma ah attribute from source to destination.
 * @dest:       Pointer to destination ah_attr. Contents of the destination
 *              pointer is assumed to be invalid and attribute are overwritten.
 * @src:        Pointer to source ah_attr.
 */
void rdma_copy_ah_attr(struct rdma_ah_attr *dest,
                       const struct rdma_ah_attr *src)
{
        *dest = *src;
        if (dest->grh.sgid_attr)
                rdma_hold_gid_attr(dest->grh.sgid_attr);
}
EXPORT_SYMBOL(rdma_copy_ah_attr);

/**
 * rdma_replace_ah_attr - Replace valid ah_attr with new new one.
 * @old:        Pointer to existing ah_attr which needs to be replaced.
 *              old is assumed to be valid or zero'd
 * @new:        Pointer to the new ah_attr.
 *
 * rdma_replace_ah_attr() first releases any reference in the old ah_attr if
 * old the ah_attr is valid; after that it copies the new attribute and holds
 * the reference to the replaced ah_attr.
 */
void rdma_replace_ah_attr(struct rdma_ah_attr *old,
                          const struct rdma_ah_attr *new)
{
        rdma_destroy_ah_attr(old);
        *old = *new;
        if (old->grh.sgid_attr)
                rdma_hold_gid_attr(old->grh.sgid_attr);
}
EXPORT_SYMBOL(rdma_replace_ah_attr);

/**
 * rdma_move_ah_attr - Move ah_attr pointed by source to destination.
 * @dest:       Pointer to destination ah_attr to copy to.
 *              dest is assumed to be valid or zero'd
 * @src:        Pointer to the new ah_attr.
 *
 * rdma_move_ah_attr() first releases any reference in the destination ah_attr
 * if it is valid. This also transfers ownership of internal references from
 * src to dest, making src invalid in the process. No new reference of the src
 * ah_attr is taken.
 */
void rdma_move_ah_attr(struct rdma_ah_attr *dest, struct rdma_ah_attr *src)
{
        rdma_destroy_ah_attr(dest);
        *dest = *src;
        src->grh.sgid_attr = NULL;
}
EXPORT_SYMBOL(rdma_move_ah_attr);

/*
 * Validate that the rdma_ah_attr is valid for the device before passing it
 * off to the driver.
 */
static int rdma_check_ah_attr(struct ib_device *device,
                              struct rdma_ah_attr *ah_attr)
{
        if (!rdma_is_port_valid(device, ah_attr->port_num))
                return -EINVAL;

        if ((rdma_is_grh_required(device, ah_attr->port_num) ||
             ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) &&
            !(ah_attr->ah_flags & IB_AH_GRH))
                return -EINVAL;

        if (ah_attr->grh.sgid_attr) {
                /*
                 * Make sure the passed sgid_attr is consistent with the
                 * parameters
                 */
                if (ah_attr->grh.sgid_attr->index != ah_attr->grh.sgid_index ||
                    ah_attr->grh.sgid_attr->port_num != ah_attr->port_num)
                        return -EINVAL;
        }
        return 0;
}

/*
 * If the ah requires a GRH then ensure that sgid_attr pointer is filled in.
 * On success the caller is responsible to call rdma_unfill_sgid_attr().
 */
static int rdma_fill_sgid_attr(struct ib_device *device,
                               struct rdma_ah_attr *ah_attr,
                               const struct ib_gid_attr **old_sgid_attr)
{
        const struct ib_gid_attr *sgid_attr;
        struct ib_global_route *grh;
        int ret;

        *old_sgid_attr = ah_attr->grh.sgid_attr;

        ret = rdma_check_ah_attr(device, ah_attr);
        if (ret)
                return ret;

        if (!(ah_attr->ah_flags & IB_AH_GRH))
                return 0;

        grh = rdma_ah_retrieve_grh(ah_attr);
        if (grh->sgid_attr)
                return 0;

        sgid_attr =
                rdma_get_gid_attr(device, ah_attr->port_num, grh->sgid_index);
        if (IS_ERR(sgid_attr))
                return PTR_ERR(sgid_attr);

        /* Move ownerhip of the kref into the ah_attr */
        grh->sgid_attr = sgid_attr;
        return 0;
}

static void rdma_unfill_sgid_attr(struct rdma_ah_attr *ah_attr,
                                  const struct ib_gid_attr *old_sgid_attr)
{
        /*
         * Fill didn't change anything, the caller retains ownership of
         * whatever it passed
         */
        if (ah_attr->grh.sgid_attr == old_sgid_attr)
                return;

        /*
         * Otherwise, we need to undo what rdma_fill_sgid_attr so the caller
         * doesn't see any change in the rdma_ah_attr. If we get here
         * old_sgid_attr is NULL.
         */
        rdma_destroy_ah_attr(ah_attr);
}

static const struct ib_gid_attr *
rdma_update_sgid_attr(struct rdma_ah_attr *ah_attr,
                      const struct ib_gid_attr *old_attr)
{
        if (old_attr)
                rdma_put_gid_attr(old_attr);
        if (ah_attr->ah_flags & IB_AH_GRH) {
                rdma_hold_gid_attr(ah_attr->grh.sgid_attr);
                return ah_attr->grh.sgid_attr;
        }
        return NULL;
}

static struct ib_ah *_rdma_create_ah(struct ib_pd *pd,
                                     struct rdma_ah_attr *ah_attr,
                                     u32 flags,
                                     struct ib_udata *udata)
{
        struct ib_device *device = pd->device;
        struct ib_ah *ah;
        int ret;

        might_sleep_if(flags & RDMA_CREATE_AH_SLEEPABLE);

        if (!device->ops.create_ah)
                return ERR_PTR(-EOPNOTSUPP);

        ah = rdma_zalloc_drv_obj_gfp(
                device, ib_ah,
                (flags & RDMA_CREATE_AH_SLEEPABLE) ? GFP_KERNEL : GFP_ATOMIC);
        if (!ah)
                return ERR_PTR(-ENOMEM);

        ah->device = device;
        ah->pd = pd;
        ah->type = ah_attr->type;
        ah->sgid_attr = rdma_update_sgid_attr(ah_attr, NULL);

        ret = device->ops.create_ah(ah, ah_attr, flags, udata);
        if (ret) {
                kfree(ah);
                return ERR_PTR(ret);
        }

        atomic_inc(&pd->usecnt);
        return ah;
}

/**
 * rdma_create_ah - Creates an address handle for the
 * given address vector.
 * @pd: The protection domain associated with the address handle.
 * @ah_attr: The attributes of the address vector.
 * @flags: Create address handle flags (see enum rdma_create_ah_flags).
 *
 * It returns 0 on success and returns appropriate error code on error.
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *rdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
                             u32 flags)
{
        const struct ib_gid_attr *old_sgid_attr;
        struct ib_ah *ah;
        int ret;

        ret = rdma_fill_sgid_attr(pd->device, ah_attr, &old_sgid_attr);
        if (ret)
                return ERR_PTR(ret);

        ah = _rdma_create_ah(pd, ah_attr, flags, NULL);

        rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
        return ah;
}
EXPORT_SYMBOL(rdma_create_ah);

/**
 * rdma_create_user_ah - Creates an address handle for the
 * given address vector.
 * It resolves destination mac address for ah attribute of RoCE type.
 * @pd: The protection domain associated with the address handle.
 * @ah_attr: The attributes of the address vector.
 * @udata: pointer to user's input output buffer information need by
 *         provider driver.
 *
 * It returns 0 on success and returns appropriate error code on error.
 * The address handle is used to reference a local or global destination
 * in all UD QP post sends.
 */
struct ib_ah *rdma_create_user_ah(struct ib_pd *pd,
                                  struct rdma_ah_attr *ah_attr,
                                  struct ib_udata *udata)
{
        const struct ib_gid_attr *old_sgid_attr;
        struct ib_ah *ah;
        int err;

        err = rdma_fill_sgid_attr(pd->device, ah_attr, &old_sgid_attr);
        if (err)
                return ERR_PTR(err);

        if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
                err = ib_resolve_eth_dmac(pd->device, ah_attr);
                if (err) {
                        ah = ERR_PTR(err);
                        goto out;
                }
        }

        ah = _rdma_create_ah(pd, ah_attr, RDMA_CREATE_AH_SLEEPABLE, udata);

out:
        rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
        return ah;
}
EXPORT_SYMBOL(rdma_create_user_ah);

int ib_get_rdma_header_version(const union rdma_network_hdr *hdr)
{
        const struct iphdr *ip4h = (struct iphdr *)&hdr->roce4grh;
        struct iphdr ip4h_checked;
        const struct ipv6hdr *ip6h = (struct ipv6hdr *)&hdr->ibgrh;

        /* If it's IPv6, the version must be 6, otherwise, the first
         * 20 bytes (before the IPv4 header) are garbled.
         */
        if (ip6h->version != 6)
                return (ip4h->version == 4) ? 4 : 0;
        /* version may be 6 or 4 because the first 20 bytes could be garbled */

        /* RoCE v2 requires no options, thus header length
         * must be 5 words
         */
        if (ip4h->ihl != 5)
                return 6;

        /* Verify checksum.
         * We can't write on scattered buffers so we need to copy to
         * temp buffer.
         */
        memcpy(&ip4h_checked, ip4h, sizeof(ip4h_checked));
        ip4h_checked.check = 0;
        ip4h_checked.check = ip_fast_csum((u8 *)&ip4h_checked, 5);
        /* if IPv4 header checksum is OK, believe it */
        if (ip4h->check == ip4h_checked.check)
                return 4;
        return 6;
}
EXPORT_SYMBOL(ib_get_rdma_header_version);

static enum rdma_network_type ib_get_net_type_by_grh(struct ib_device *device,
                                                     u8 port_num,
                                                     const struct ib_grh *grh)
{
        int grh_version;

        if (rdma_protocol_ib(device, port_num))
                return RDMA_NETWORK_IB;

        grh_version = ib_get_rdma_header_version((union rdma_network_hdr *)grh);

        if (grh_version == 4)
                return RDMA_NETWORK_IPV4;

        if (grh->next_hdr == IPPROTO_UDP)
                return RDMA_NETWORK_IPV6;

        return RDMA_NETWORK_ROCE_V1;
}

struct find_gid_index_context {
        u16 vlan_id;
        enum ib_gid_type gid_type;
};

static bool find_gid_index(const union ib_gid *gid,
                           const struct ib_gid_attr *gid_attr,
                           void *context)
{
        struct find_gid_index_context *ctx = context;
        u16 vlan_id = 0xffff;
        int ret;

        if (ctx->gid_type != gid_attr->gid_type)
                return false;

        ret = rdma_read_gid_l2_fields(gid_attr, &vlan_id, NULL);
        if (ret)
                return false;

        return ctx->vlan_id == vlan_id;
}

static const struct ib_gid_attr *
get_sgid_attr_from_eth(struct ib_device *device, u8 port_num,
                       u16 vlan_id, const union ib_gid *sgid,
                       enum ib_gid_type gid_type)
{
        struct find_gid_index_context context = {.vlan_id = vlan_id,
                                                 .gid_type = gid_type};

        return rdma_find_gid_by_filter(device, sgid, port_num, find_gid_index,
                                       &context);
}

int ib_get_gids_from_rdma_hdr(const union rdma_network_hdr *hdr,
                              enum rdma_network_type net_type,
                              union ib_gid *sgid, union ib_gid *dgid)
{
        struct sockaddr_in  src_in;
        struct sockaddr_in  dst_in;
        __be32 src_saddr, dst_saddr;

        if (!sgid || !dgid)
                return -EINVAL;

        if (net_type == RDMA_NETWORK_IPV4) {
                memcpy(&src_in.sin_addr.s_addr,
                       &hdr->roce4grh.saddr, 4);
                memcpy(&dst_in.sin_addr.s_addr,
                       &hdr->roce4grh.daddr, 4);
                src_saddr = src_in.sin_addr.s_addr;
                dst_saddr = dst_in.sin_addr.s_addr;
                ipv6_addr_set_v4mapped(src_saddr,
                                       (struct in6_addr *)sgid);
                ipv6_addr_set_v4mapped(dst_saddr,
                                       (struct in6_addr *)dgid);
                return 0;
        } else if (net_type == RDMA_NETWORK_IPV6 ||
                   net_type == RDMA_NETWORK_IB) {
                *dgid = hdr->ibgrh.dgid;
                *sgid = hdr->ibgrh.sgid;
                return 0;
        } else {
                return -EINVAL;
        }
}
EXPORT_SYMBOL(ib_get_gids_from_rdma_hdr);

/* Resolve destination mac address and hop limit for unicast destination
 * GID entry, considering the source GID entry as well.
 * ah_attribute must have have valid port_num, sgid_index.
 */
static int ib_resolve_unicast_gid_dmac(struct ib_device *device,
                                       struct rdma_ah_attr *ah_attr)
{
        struct ib_global_route *grh = rdma_ah_retrieve_grh(ah_attr);
        const struct ib_gid_attr *sgid_attr = grh->sgid_attr;
        int hop_limit = 0xff;
        int ret = 0;

        /* If destination is link local and source GID is RoCEv1,
         * IP stack is not used.
         */
        if (rdma_link_local_addr((struct in6_addr *)grh->dgid.raw) &&
            sgid_attr->gid_type == IB_GID_TYPE_ROCE) {
                rdma_get_ll_mac((struct in6_addr *)grh->dgid.raw,
                                ah_attr->roce.dmac);
                return ret;
        }

        ret = rdma_addr_find_l2_eth_by_grh(&sgid_attr->gid, &grh->dgid,
                                           ah_attr->roce.dmac,
                                           sgid_attr, &hop_limit);

        grh->hop_limit = hop_limit;
        return ret;
}

/*
 * This function initializes address handle attributes from the incoming packet.
 * Incoming packet has dgid of the receiver node on which this code is
 * getting executed and, sgid contains the GID of the sender.
 *
 * When resolving mac address of destination, the arrived dgid is used
 * as sgid and, sgid is used as dgid because sgid contains destinations
 * GID whom to respond to.
 *
 * On success the caller is responsible to call rdma_destroy_ah_attr on the
 * attr.
 */
int ib_init_ah_attr_from_wc(struct ib_device *device, u8 port_num,
                            const struct ib_wc *wc, const struct ib_grh *grh,
                            struct rdma_ah_attr *ah_attr)
{
        u32 flow_class;
        int ret;
        enum rdma_network_type net_type = RDMA_NETWORK_IB;
        enum ib_gid_type gid_type = IB_GID_TYPE_IB;
        const struct ib_gid_attr *sgid_attr;
        int hoplimit = 0xff;
        union ib_gid dgid;
        union ib_gid sgid;

        might_sleep();

        memset(ah_attr, 0, sizeof *ah_attr);
        ah_attr->type = rdma_ah_find_type(device, port_num);
        if (rdma_cap_eth_ah(device, port_num)) {
                if (wc->wc_flags & IB_WC_WITH_NETWORK_HDR_TYPE)
                        net_type = wc->network_hdr_type;
                else
                        net_type = ib_get_net_type_by_grh(device, port_num, grh);
                gid_type = ib_network_to_gid_type(net_type);
        }
        ret = ib_get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type,
                                        &sgid, &dgid);
        if (ret)
                return ret;

        rdma_ah_set_sl(ah_attr, wc->sl);
        rdma_ah_set_port_num(ah_attr, port_num);

        if (rdma_protocol_roce(device, port_num)) {
                u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ?
                                wc->vlan_id : 0xffff;

                if (!(wc->wc_flags & IB_WC_GRH))
                        return -EPROTOTYPE;

                sgid_attr = get_sgid_attr_from_eth(device, port_num,
                                                   vlan_id, &dgid,
                                                   gid_type);
                if (IS_ERR(sgid_attr))
                        return PTR_ERR(sgid_attr);

                flow_class = be32_to_cpu(grh->version_tclass_flow);
                rdma_move_grh_sgid_attr(ah_attr,
                                        &sgid,
                                        flow_class & 0xFFFFF,
                                        hoplimit,
                                        (flow_class >> 20) & 0xFF,
                                        sgid_attr);

                ret = ib_resolve_unicast_gid_dmac(device, ah_attr);
                if (ret)
                        rdma_destroy_ah_attr(ah_attr);

                return ret;
        } else {
                rdma_ah_set_dlid(ah_attr, wc->slid);
                rdma_ah_set_path_bits(ah_attr, wc->dlid_path_bits);

                if ((wc->wc_flags & IB_WC_GRH) == 0)
                        return 0;

                if (dgid.global.interface_id !=
                                        cpu_to_be64(IB_SA_WELL_KNOWN_GUID)) {
                        sgid_attr = rdma_find_gid_by_port(
                                device, &dgid, IB_GID_TYPE_IB, port_num, NULL);
                } else
                        sgid_attr = rdma_get_gid_attr(device, port_num, 0);

                if (IS_ERR(sgid_attr))
                        return PTR_ERR(sgid_attr);
                flow_class = be32_to_cpu(grh->version_tclass_flow);
                rdma_move_grh_sgid_attr(ah_attr,
                                        &sgid,
                                        flow_class & 0xFFFFF,
                                        hoplimit,
                                        (flow_class >> 20) & 0xFF,
                                        sgid_attr);

                return 0;
        }
}
EXPORT_SYMBOL(ib_init_ah_attr_from_wc);

/**
 * rdma_move_grh_sgid_attr - Sets the sgid attribute of GRH, taking ownership
 * of the reference
 *
 * @attr:       Pointer to AH attribute structure
 * @dgid:       Destination GID
 * @flow_label: Flow label
 * @hop_limit:  Hop limit
 * @traffic_class: traffic class
 * @sgid_attr:  Pointer to SGID attribute
 *
 * This takes ownership of the sgid_attr reference. The caller must ensure
 * rdma_destroy_ah_attr() is called before destroying the rdma_ah_attr after
 * calling this function.
 */
void rdma_move_grh_sgid_attr(struct rdma_ah_attr *attr, union ib_gid *dgid,
                             u32 flow_label, u8 hop_limit, u8 traffic_class,
                             const struct ib_gid_attr *sgid_attr)
{
        rdma_ah_set_grh(attr, dgid, flow_label, sgid_attr->index, hop_limit,
                        traffic_class);
        attr->grh.sgid_attr = sgid_attr;
}
EXPORT_SYMBOL(rdma_move_grh_sgid_attr);

/**
 * rdma_destroy_ah_attr - Release reference to SGID attribute of
 * ah attribute.
 * @ah_attr: Pointer to ah attribute
 *
 * Release reference to the SGID attribute of the ah attribute if it is
 * non NULL. It is safe to call this multiple times, and safe to call it on
 * a zero initialized ah_attr.
 */
void rdma_destroy_ah_attr(struct rdma_ah_attr *ah_attr)
{
        if (ah_attr->grh.sgid_attr) {
                rdma_put_gid_attr(ah_attr->grh.sgid_attr);
                ah_attr->grh.sgid_attr = NULL;
        }
}
EXPORT_SYMBOL(rdma_destroy_ah_attr);

struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
                                   const struct ib_grh *grh, u8 port_num)
{
        struct rdma_ah_attr ah_attr;
        struct ib_ah *ah;
        int ret;

        ret = ib_init_ah_attr_from_wc(pd->device, port_num, wc, grh, &ah_attr);
        if (ret)
                return ERR_PTR(ret);

        ah = rdma_create_ah(pd, &ah_attr, RDMA_CREATE_AH_SLEEPABLE);

        rdma_destroy_ah_attr(&ah_attr);
        return ah;
}
EXPORT_SYMBOL(ib_create_ah_from_wc);

int rdma_modify_ah(struct ib_ah *ah, struct rdma_ah_attr *ah_attr)
{
        const struct ib_gid_attr *old_sgid_attr;
        int ret;

        if (ah->type != ah_attr->type)
                return -EINVAL;

        ret = rdma_fill_sgid_attr(ah->device, ah_attr, &old_sgid_attr);
        if (ret)
                return ret;

        ret = ah->device->ops.modify_ah ?
                ah->device->ops.modify_ah(ah, ah_attr) :
                -EOPNOTSUPP;

        ah->sgid_attr = rdma_update_sgid_attr(ah_attr, ah->sgid_attr);
        rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
        return ret;
}
EXPORT_SYMBOL(rdma_modify_ah);

int rdma_query_ah(struct ib_ah *ah, struct rdma_ah_attr *ah_attr)
{
        ah_attr->grh.sgid_attr = NULL;

        return ah->device->ops.query_ah ?
                ah->device->ops.query_ah(ah, ah_attr) :
                -EOPNOTSUPP;
}
EXPORT_SYMBOL(rdma_query_ah);

int rdma_destroy_ah_user(struct ib_ah *ah, u32 flags, struct ib_udata *udata)
{
        const struct ib_gid_attr *sgid_attr = ah->sgid_attr;
        struct ib_pd *pd;

        might_sleep_if(flags & RDMA_DESTROY_AH_SLEEPABLE);

        pd = ah->pd;

        ah->device->ops.destroy_ah(ah, flags);
        atomic_dec(&pd->usecnt);
        if (sgid_attr)
                rdma_put_gid_attr(sgid_attr);

        kfree(ah);
        return 0;
}
EXPORT_SYMBOL(rdma_destroy_ah_user);

/* Shared receive queues */

struct ib_srq *ib_create_srq(struct ib_pd *pd,
                             struct ib_srq_init_attr *srq_init_attr)
{
        struct ib_srq *srq;
        int ret;

        if (!pd->device->ops.create_srq)
                return ERR_PTR(-EOPNOTSUPP);

        srq = rdma_zalloc_drv_obj(pd->device, ib_srq);
        if (!srq)
                return ERR_PTR(-ENOMEM);

        srq->device = pd->device;
        srq->pd = pd;
        srq->event_handler = srq_init_attr->event_handler;
        srq->srq_context = srq_init_attr->srq_context;
        srq->srq_type = srq_init_attr->srq_type;

        if (ib_srq_has_cq(srq->srq_type)) {
                srq->ext.cq = srq_init_attr->ext.cq;
                atomic_inc(&srq->ext.cq->usecnt);
        }
        if (srq->srq_type == IB_SRQT_XRC) {
                srq->ext.xrc.xrcd = srq_init_attr->ext.xrc.xrcd;
                atomic_inc(&srq->ext.xrc.xrcd->usecnt);
        }
        atomic_inc(&pd->usecnt);

        ret = pd->device->ops.create_srq(srq, srq_init_attr, NULL);
        if (ret) {
                atomic_dec(&srq->pd->usecnt);
                if (srq->srq_type == IB_SRQT_XRC)
                        atomic_dec(&srq->ext.xrc.xrcd->usecnt);

                if (ib_srq_has_cq(srq->srq_type))
                        atomic_dec(&srq->ext.cq->usecnt);
                kfree(srq);
                return ERR_PTR(ret);
        }

        return srq;
}
EXPORT_SYMBOL(ib_create_srq);

int ib_modify_srq(struct ib_srq *srq,
                  struct ib_srq_attr *srq_attr,
                  enum ib_srq_attr_mask srq_attr_mask)
{
        return srq->device->ops.modify_srq ?
                srq->device->ops.modify_srq(srq, srq_attr, srq_attr_mask,
                                            NULL) : -EOPNOTSUPP;
}
EXPORT_SYMBOL(ib_modify_srq);

int ib_query_srq(struct ib_srq *srq,
                 struct ib_srq_attr *srq_attr)
{
        return srq->device->ops.query_srq ?
                srq->device->ops.query_srq(srq, srq_attr) : -EOPNOTSUPP;
}
EXPORT_SYMBOL(ib_query_srq);

int ib_destroy_srq_user(struct ib_srq *srq, struct ib_udata *udata)
{
        if (atomic_read(&srq->usecnt))
                return -EBUSY;

        srq->device->ops.destroy_srq(srq, udata);

        atomic_dec(&srq->pd->usecnt);
        if (srq->srq_type == IB_SRQT_XRC)
                atomic_dec(&srq->ext.xrc.xrcd->usecnt);
        if (ib_srq_has_cq(srq->srq_type))
                atomic_dec(&srq->ext.cq->usecnt);
        kfree(srq);

        return 0;
}
EXPORT_SYMBOL(ib_destroy_srq_user);

/* Queue pairs */

static void __ib_shared_qp_event_handler(struct ib_event *event, void *context)
{
        struct ib_qp *qp = context;
        unsigned long flags;

        spin_lock_irqsave(&qp->device->event_handler_lock, flags);
        list_for_each_entry(event->element.qp, &qp->open_list, open_list)
                if (event->element.qp->event_handler)
                        event->element.qp->event_handler(event, event->element.qp->qp_context);
        spin_unlock_irqrestore(&qp->device->event_handler_lock, flags);
}

static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp)
{
        mutex_lock(&xrcd->tgt_qp_mutex);
        list_add(&qp->xrcd_list, &xrcd->tgt_qp_list);
        mutex_unlock(&xrcd->tgt_qp_mutex);
}

static struct ib_qp *__ib_open_qp(struct ib_qp *real_qp,
                                  void (*event_handler)(struct ib_event *, void *),
                                  void *qp_context)
{
        struct ib_qp *qp;
        unsigned long flags;
        int err;

        qp = kzalloc(sizeof *qp, GFP_KERNEL);
        if (!qp)
                return ERR_PTR(-ENOMEM);

        qp->real_qp = real_qp;
        err = ib_open_shared_qp_security(qp, real_qp->device);
        if (err) {
                kfree(qp);
                return ERR_PTR(err);
        }

        qp->real_qp = real_qp;
        atomic_inc(&real_qp->usecnt);
        qp->device = real_qp->device;
        qp->event_handler = event_handler;
        qp->qp_context = qp_context;
        qp->qp_num = real_qp->qp_num;
        qp->qp_type = real_qp->qp_type;

        spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
        list_add(&qp->open_list, &real_qp->open_list);
        spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);

        return qp;
}

struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd,
                         struct ib_qp_open_attr *qp_open_attr)
{
        struct ib_qp *qp, *real_qp;

        if (qp_open_attr->qp_type != IB_QPT_XRC_TGT)
                return ERR_PTR(-EINVAL);

        qp = ERR_PTR(-EINVAL);
        mutex_lock(&xrcd->tgt_qp_mutex);
        list_for_each_entry(real_qp, &xrcd->tgt_qp_list, xrcd_list) {
                if (real_qp->qp_num == qp_open_attr->qp_num) {
                        qp = __ib_open_qp(real_qp, qp_open_attr->event_handler,
                                          qp_open_attr->qp_context);
                        break;
                }
        }
        mutex_unlock(&xrcd->tgt_qp_mutex);
        return qp;
}
EXPORT_SYMBOL(ib_open_qp);

static struct ib_qp *create_xrc_qp_user(struct ib_qp *qp,
                                        struct ib_qp_init_attr *qp_init_attr,
                                        struct ib_udata *udata)
{
        struct ib_qp *real_qp = qp;

        qp->event_handler = __ib_shared_qp_event_handler;
        qp->qp_context = qp;
        qp->pd = NULL;
        qp->send_cq = qp->recv_cq = NULL;
        qp->srq = NULL;
        qp->xrcd = qp_init_attr->xrcd;
        atomic_inc(&qp_init_attr->xrcd->usecnt);
        INIT_LIST_HEAD(&qp->open_list);

        qp = __ib_open_qp(real_qp, qp_init_attr->event_handler,
                          qp_init_attr->qp_context);
        if (IS_ERR(qp))
                return qp;

        __ib_insert_xrcd_qp(qp_init_attr->xrcd, real_qp);
        return qp;
}

struct ib_qp *ib_create_qp_user(struct ib_pd *pd,
                                struct ib_qp_init_attr *qp_init_attr,
                                struct ib_udata *udata)
{
        struct ib_device *device = pd ? pd->device : qp_init_attr->xrcd->device;
        struct ib_qp *qp;
        int ret;

        if (qp_init_attr->rwq_ind_tbl &&
            (qp_init_attr->recv_cq ||
            qp_init_attr->srq || qp_init_attr->cap.max_recv_wr ||
            qp_init_attr->cap.max_recv_sge))
                return ERR_PTR(-EINVAL);

        if ((qp_init_attr->create_flags & IB_QP_CREATE_INTEGRITY_EN) &&
            !(device->attrs.device_cap_flags & IB_DEVICE_INTEGRITY_HANDOVER))
                return ERR_PTR(-EINVAL);

        /*
         * If the callers is using the RDMA API calculate the resources
         * needed for the RDMA READ/WRITE operations.
         *
         * Note that these callers need to pass in a port number.
         */
        if (qp_init_attr->cap.max_rdma_ctxs)
                rdma_rw_init_qp(device, qp_init_attr);

        qp = _ib_create_qp(device, pd, qp_init_attr, NULL, NULL);
        if (IS_ERR(qp))
                return qp;

        ret = ib_create_qp_security(qp, device);
        if (ret)
                goto err;

        qp->qp_type    = qp_init_attr->qp_type;
        qp->rwq_ind_tbl = qp_init_attr->rwq_ind_tbl;

        atomic_set(&qp->usecnt, 0);
        qp->mrs_used = 0;
        spin_lock_init(&qp->mr_lock);
        INIT_LIST_HEAD(&qp->rdma_mrs);
        INIT_LIST_HEAD(&qp->sig_mrs);
        qp->port = 0;

        if (qp_init_attr->qp_type == IB_QPT_XRC_TGT) {
                struct ib_qp *xrc_qp =
                        create_xrc_qp_user(qp, qp_init_attr, udata);

                if (IS_ERR(xrc_qp)) {
                        ret = PTR_ERR(xrc_qp);
                        goto err;
                }
                return xrc_qp;
        }

        qp->event_handler = qp_init_attr->event_handler;
        qp->qp_context = qp_init_attr->qp_context;
        if (qp_init_attr->qp_type == IB_QPT_XRC_INI) {
                qp->recv_cq = NULL;
                qp->srq = NULL;
        } else {
                qp->recv_cq = qp_init_attr->recv_cq;
                if (qp_init_attr->recv_cq)
                        atomic_inc(&qp_init_attr->recv_cq->usecnt);
                qp->srq = qp_init_attr->srq;
                if (qp->srq)
                        atomic_inc(&qp_init_attr->srq->usecnt);
        }

        qp->send_cq = qp_init_attr->send_cq;
        qp->xrcd    = NULL;

        atomic_inc(&pd->usecnt);
        if (qp_init_attr->send_cq)
                atomic_inc(&qp_init_attr->send_cq->usecnt);
        if (qp_init_attr->rwq_ind_tbl)
                atomic_inc(&qp->rwq_ind_tbl->usecnt);

        if (qp_init_attr->cap.max_rdma_ctxs) {
                ret = rdma_rw_init_mrs(qp, qp_init_attr);
                if (ret)
                        goto err;
        }

        /*
         * Note: all hw drivers guarantee that max_send_sge is lower than
         * the device RDMA WRITE SGE limit but not all hw drivers ensure that
         * max_send_sge <= max_sge_rd.
         */
        qp->max_write_sge = qp_init_attr->cap.max_send_sge;
        qp->max_read_sge = min_t(u32, qp_init_attr->cap.max_send_sge,
                                 device->attrs.max_sge_rd);
        if (qp_init_attr->create_flags & IB_QP_CREATE_INTEGRITY_EN)
                qp->integrity_en = true;

        return qp;

err:
        ib_destroy_qp(qp);
        return ERR_PTR(ret);

}
EXPORT_SYMBOL(ib_create_qp_user);

static const struct {
        int                     valid;
        enum ib_qp_attr_mask    req_param[IB_QPT_MAX];
        enum ib_qp_attr_mask    opt_param[IB_QPT_MAX];
} qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
        [IB_QPS_RESET] = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_INIT]  = {
                        .valid = 1,
                        .req_param = {
                                [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_PORT                      |
                                                IB_QP_QKEY),
                                [IB_QPT_RAW_PACKET] = IB_QP_PORT,
                                [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                                [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                        }
                },
        },
        [IB_QPS_INIT]  = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_ERR] =   { .valid = 1 },
                [IB_QPS_INIT]  = {
                        .valid = 1,
                        .opt_param = {
                                [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_PORT                      |
                                                IB_QP_QKEY),
                                [IB_QPT_UC]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_RC]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX            |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX            |
                                                IB_QP_PORT                      |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                                [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                        }
                },
                [IB_QPS_RTR]   = {
                        .valid = 1,
                        .req_param = {
                                [IB_QPT_UC]  = (IB_QP_AV                        |
                                                IB_QP_PATH_MTU                  |
                                                IB_QP_DEST_QPN                  |
                                                IB_QP_RQ_PSN),
                                [IB_QPT_RC]  = (IB_QP_AV                        |
                                                IB_QP_PATH_MTU                  |
                                                IB_QP_DEST_QPN                  |
                                                IB_QP_RQ_PSN                    |
                                                IB_QP_MAX_DEST_RD_ATOMIC        |
                                                IB_QP_MIN_RNR_TIMER),
                                [IB_QPT_XRC_INI] = (IB_QP_AV                    |
                                                IB_QP_PATH_MTU                  |
                                                IB_QP_DEST_QPN                  |
                                                IB_QP_RQ_PSN),
                                [IB_QPT_XRC_TGT] = (IB_QP_AV                    |
                                                IB_QP_PATH_MTU                  |
                                                IB_QP_DEST_QPN                  |
                                                IB_QP_RQ_PSN                    |
                                                IB_QP_MAX_DEST_RD_ATOMIC        |
                                                IB_QP_MIN_RNR_TIMER),
                        },
                        .opt_param = {
                                 [IB_QPT_UD]  = (IB_QP_PKEY_INDEX               |
                                                 IB_QP_QKEY),
                                 [IB_QPT_UC]  = (IB_QP_ALT_PATH                 |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_PKEY_INDEX),
                                 [IB_QPT_RC]  = (IB_QP_ALT_PATH                 |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_PKEY_INDEX),
                                 [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH             |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_PKEY_INDEX),
                                 [IB_QPT_XRC_TGT] = (IB_QP_ALT_PATH             |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_PKEY_INDEX),
                                 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX               |
                                                 IB_QP_QKEY),
                                 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX               |
                                                 IB_QP_QKEY),
                         },
                },
        },
        [IB_QPS_RTR]   = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_ERR] =   { .valid = 1 },
                [IB_QPS_RTS]   = {
                        .valid = 1,
                        .req_param = {
                                [IB_QPT_UD]  = IB_QP_SQ_PSN,
                                [IB_QPT_UC]  = IB_QP_SQ_PSN,
                                [IB_QPT_RC]  = (IB_QP_TIMEOUT                   |
                                                IB_QP_RETRY_CNT                 |
                                                IB_QP_RNR_RETRY                 |
                                                IB_QP_SQ_PSN                    |
                                                IB_QP_MAX_QP_RD_ATOMIC),
                                [IB_QPT_XRC_INI] = (IB_QP_TIMEOUT               |
                                                IB_QP_RETRY_CNT                 |
                                                IB_QP_RNR_RETRY                 |
                                                IB_QP_SQ_PSN                    |
                                                IB_QP_MAX_QP_RD_ATOMIC),
                                [IB_QPT_XRC_TGT] = (IB_QP_TIMEOUT               |
                                                IB_QP_SQ_PSN),
                                [IB_QPT_SMI] = IB_QP_SQ_PSN,
                                [IB_QPT_GSI] = IB_QP_SQ_PSN,
                        },
                        .opt_param = {
                                 [IB_QPT_UD]  = (IB_QP_CUR_STATE                |
                                                 IB_QP_QKEY),
                                 [IB_QPT_UC]  = (IB_QP_CUR_STATE                |
                                                 IB_QP_ALT_PATH                 |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_PATH_MIG_STATE),
                                 [IB_QPT_RC]  = (IB_QP_CUR_STATE                |
                                                 IB_QP_ALT_PATH                 |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_MIN_RNR_TIMER            |
                                                 IB_QP_PATH_MIG_STATE),
                                 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE            |
                                                 IB_QP_ALT_PATH                 |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_PATH_MIG_STATE),
                                 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE            |
                                                 IB_QP_ALT_PATH                 |
                                                 IB_QP_ACCESS_FLAGS             |
                                                 IB_QP_MIN_RNR_TIMER            |
                                                 IB_QP_PATH_MIG_STATE),
                                 [IB_QPT_SMI] = (IB_QP_CUR_STATE                |
                                                 IB_QP_QKEY),
                                 [IB_QPT_GSI] = (IB_QP_CUR_STATE                |
                                                 IB_QP_QKEY),
                                 [IB_QPT_RAW_PACKET] = IB_QP_RATE_LIMIT,
                         }
                }
        },
        [IB_QPS_RTS]   = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_ERR] =   { .valid = 1 },
                [IB_QPS_RTS]   = {
                        .valid = 1,
                        .opt_param = {
                                [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_PATH_MIG_STATE            |
                                                IB_QP_MIN_RNR_TIMER),
                                [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_PATH_MIG_STATE            |
                                                IB_QP_MIN_RNR_TIMER),
                                [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_RAW_PACKET] = IB_QP_RATE_LIMIT,
                        }
                },
                [IB_QPS_SQD]   = {
                        .valid = 1,
                        .opt_param = {
                                [IB_QPT_UD]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
                                [IB_QPT_UC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
                                [IB_QPT_RC]  = IB_QP_EN_SQD_ASYNC_NOTIFY,
                                [IB_QPT_XRC_INI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
                                [IB_QPT_XRC_TGT] = IB_QP_EN_SQD_ASYNC_NOTIFY, /* ??? */
                                [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY,
                                [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY
                        }
                },
        },
        [IB_QPS_SQD]   = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_ERR] =   { .valid = 1 },
                [IB_QPS_RTS]   = {
                        .valid = 1,
                        .opt_param = {
                                [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_RC]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_MIN_RNR_TIMER             |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE             |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE             |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_MIN_RNR_TIMER             |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                        }
                },
                [IB_QPS_SQD]   = {
                        .valid = 1,
                        .opt_param = {
                                [IB_QPT_UD]  = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                                [IB_QPT_UC]  = (IB_QP_AV                        |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_PKEY_INDEX                |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_RC]  = (IB_QP_PORT                      |
                                                IB_QP_AV                        |
                                                IB_QP_TIMEOUT                   |
                                                IB_QP_RETRY_CNT                 |
                                                IB_QP_RNR_RETRY                 |
                                                IB_QP_MAX_QP_RD_ATOMIC          |
                                                IB_QP_MAX_DEST_RD_ATOMIC        |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_PKEY_INDEX                |
                                                IB_QP_MIN_RNR_TIMER             |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_XRC_INI] = (IB_QP_PORT                  |
                                                IB_QP_AV                        |
                                                IB_QP_TIMEOUT                   |
                                                IB_QP_RETRY_CNT                 |
                                                IB_QP_RNR_RETRY                 |
                                                IB_QP_MAX_QP_RD_ATOMIC          |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_PKEY_INDEX                |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_XRC_TGT] = (IB_QP_PORT                  |
                                                IB_QP_AV                        |
                                                IB_QP_TIMEOUT                   |
                                                IB_QP_MAX_DEST_RD_ATOMIC        |
                                                IB_QP_ALT_PATH                  |
                                                IB_QP_ACCESS_FLAGS              |
                                                IB_QP_PKEY_INDEX                |
                                                IB_QP_MIN_RNR_TIMER             |
                                                IB_QP_PATH_MIG_STATE),
                                [IB_QPT_SMI] = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                                [IB_QPT_GSI] = (IB_QP_PKEY_INDEX                |
                                                IB_QP_QKEY),
                        }
                }
        },
        [IB_QPS_SQE]   = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_ERR] =   { .valid = 1 },
                [IB_QPS_RTS]   = {
                        .valid = 1,
                        .opt_param = {
                                [IB_QPT_UD]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_UC]  = (IB_QP_CUR_STATE                 |
                                                IB_QP_ACCESS_FLAGS),
                                [IB_QPT_SMI] = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                                [IB_QPT_GSI] = (IB_QP_CUR_STATE                 |
                                                IB_QP_QKEY),
                        }
                }
        },
        [IB_QPS_ERR] = {
                [IB_QPS_RESET] = { .valid = 1 },
                [IB_QPS_ERR] =   { .valid = 1 }
        }
};

bool ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
                        enum ib_qp_type type, enum ib_qp_attr_mask mask)
{
        enum ib_qp_attr_mask req_param, opt_param;

        if (mask & IB_QP_CUR_STATE  &&
            cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS &&
            cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE)
                return false;

        if (!qp_state_table[cur_state][next_state].valid)
                return false;

        req_param = qp_state_table[cur_state][next_state].req_param[type];
        opt_param = qp_state_table[cur_state][next_state].opt_param[type];

        if ((mask & req_param) != req_param)
                return false;

        if (mask & ~(req_param | opt_param | IB_QP_STATE))
                return false;

        return true;
}
EXPORT_SYMBOL(ib_modify_qp_is_ok);

/**
 * ib_resolve_eth_dmac - Resolve destination mac address
 * @device:             Device to consider
 * @ah_attr:            address handle attribute which describes the
 *                      source and destination parameters
 * ib_resolve_eth_dmac() resolves destination mac address and L3 hop limit It
 * returns 0 on success or appropriate error code. It initializes the
 * necessary ah_attr fields when call is successful.
 */
static int ib_resolve_eth_dmac(struct ib_device *device,
                               struct rdma_ah_attr *ah_attr)
{
        int ret = 0;

        if (rdma_is_multicast_addr((struct in6_addr *)ah_attr->grh.dgid.raw)) {
                if (ipv6_addr_v4mapped((struct in6_addr *)ah_attr->grh.dgid.raw)) {
                        __be32 addr = 0;

                        memcpy(&addr, ah_attr->grh.dgid.raw + 12, 4);
                        ip_eth_mc_map(addr, (char *)ah_attr->roce.dmac);
                } else {
                        ipv6_eth_mc_map((struct in6_addr *)ah_attr->grh.dgid.raw,
                                        (char *)ah_attr->roce.dmac);
                }
        } else {
                ret = ib_resolve_unicast_gid_dmac(device, ah_attr);
        }
        return ret;
}

static bool is_qp_type_connected(const struct ib_qp *qp)
{
        return (qp->qp_type == IB_QPT_UC ||
                qp->qp_type == IB_QPT_RC ||
                qp->qp_type == IB_QPT_XRC_INI ||
                qp->qp_type == IB_QPT_XRC_TGT);
}

/**
 * IB core internal function to perform QP attributes modification.
 */
static int _ib_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr,
                         int attr_mask, struct ib_udata *udata)
{
        u8 port = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
        const struct ib_gid_attr *old_sgid_attr_av;
        const struct ib_gid_attr *old_sgid_attr_alt_av;
        int ret;

        if (attr_mask & IB_QP_AV) {
                ret = rdma_fill_sgid_attr(qp->device, &attr->ah_attr,
                                          &old_sgid_attr_av);
                if (ret)
                        return ret;
        }
        if (attr_mask & IB_QP_ALT_PATH) {
                /*
                 * FIXME: This does not track the migration state, so if the
                 * user loads a new alternate path after the HW has migrated
                 * from primary->alternate we will keep the wrong
                 * references. This is OK for IB because the reference
                 * counting does not serve any functional purpose.
                 */
                ret = rdma_fill_sgid_attr(qp->device, &attr->alt_ah_attr,
                                          &old_sgid_attr_alt_av);
                if (ret)
                        goto out_av;

                /*
                 * Today the core code can only handle alternate paths and APM
                 * for IB. Ban them in roce mode.
                 */
                if (!(rdma_protocol_ib(qp->device,
                                       attr->alt_ah_attr.port_num) &&
                      rdma_protocol_ib(qp->device, port))) {
                        ret = EINVAL;
                        goto out;
                }
        }

        /*
         * If the user provided the qp_attr then we have to resolve it. Kernel
         * users have to provide already resolved rdma_ah_attr's
         */
        if (udata && (attr_mask & IB_QP_AV) &&
            attr->ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE &&
            is_qp_type_connected(qp)) {
                ret = ib_resolve_eth_dmac(qp->device, &attr->ah_attr);
                if (ret)
                        goto out;
        }

        if (rdma_ib_or_roce(qp->device, port)) {
                if (attr_mask & IB_QP_RQ_PSN && attr->rq_psn & ~0xffffff) {
                        dev_warn(&qp->device->dev,
                                 "%s rq_psn overflow, masking to 24 bits\n",
                                 __func__);
                        attr->rq_psn &= 0xffffff;
                }

                if (attr_mask & IB_QP_SQ_PSN && attr->sq_psn & ~0xffffff) {
                        dev_warn(&qp->device->dev,
                                 " %s sq_psn overflow, masking to 24 bits\n",
                                 __func__);
                        attr->sq_psn &= 0xffffff;
                }
        }

        /*
         * Bind this qp to a counter automatically based on the rdma counter
         * rules. This only set in RST2INIT with port specified
         */
        if (!qp->counter && (attr_mask & IB_QP_PORT) &&
            ((attr_mask & IB_QP_STATE) && attr->qp_state == IB_QPS_INIT))
                rdma_counter_bind_qp_auto(qp, attr->port_num);

        ret = ib_security_modify_qp(qp, attr, attr_mask, udata);
        if (ret)
                goto out;

        if (attr_mask & IB_QP_PORT)
                qp->port = attr->port_num;
        if (attr_mask & IB_QP_AV)
                qp->av_sgid_attr =
                        rdma_update_sgid_attr(&attr->ah_attr, qp->av_sgid_attr);
        if (attr_mask & IB_QP_ALT_PATH)
                qp->alt_path_sgid_attr = rdma_update_sgid_attr(
                        &attr->alt_ah_attr, qp->alt_path_sgid_attr);

out:
        if (attr_mask & IB_QP_ALT_PATH)
                rdma_unfill_sgid_attr(&attr->alt_ah_attr, old_sgid_attr_alt_av);
out_av:
        if (attr_mask & IB_QP_AV)
                rdma_unfill_sgid_attr(&attr->ah_attr, old_sgid_attr_av);
        return ret;
}

/**
 * ib_modify_qp_with_udata - Modifies the attributes for the specified QP.
 * @ib_qp: The QP to modify.
 * @attr: On input, specifies the QP attributes to modify.  On output,
 *   the current values of selected QP attributes are returned.
 * @attr_mask: A bit-mask used to specify which attributes of the QP
 *   are being modified.
 * @udata: pointer to user's input output buffer information
 *   are being modified.
 * It returns 0 on success and returns appropriate error code on error.
 */
int ib_modify_qp_with_udata(struct ib_qp *ib_qp, struct ib_qp_attr *attr,
                            int attr_mask, struct ib_udata *udata)
{
        return _ib_modify_qp(ib_qp->real_qp, attr, attr_mask, udata);
}
EXPORT_SYMBOL(ib_modify_qp_with_udata);

int ib_get_eth_speed(struct ib_device *dev, u8 port_num, u8 *speed, u8 *width)
{
        int rc;
        u32 netdev_speed;
        struct net_device *netdev;
        struct ethtool_link_ksettings lksettings;

        if (rdma_port_get_link_layer(dev, port_num) != IB_LINK_LAYER_ETHERNET)
                return -EINVAL;

        netdev = ib_device_get_netdev(dev, port_num);
        if (!netdev)
                return -ENODEV;

        rtnl_lock();
        rc = __ethtool_get_link_ksettings(netdev, &lksettings);
        rtnl_unlock();

        dev_put(netdev);

        if (!rc) {
                netdev_speed = lksettings.base.speed;
        } else {
                netdev_speed = SPEED_1000;
                pr_warn("%s speed is unknown, defaulting to %d\n", netdev->name,
                        netdev_speed);
        }

        if (netdev_speed <= SPEED_1000) {
                *width = IB_WIDTH_1X;
                *speed = IB_SPEED_SDR;
        } else if (netdev_speed <= SPEED_10000) {
                *width = IB_WIDTH_1X;
                *speed = IB_SPEED_FDR10;
        } else if (netdev_speed <= SPEED_20000) {
                *width = IB_WIDTH_4X;
                *speed = IB_SPEED_DDR;
        } else if (netdev_speed <= SPEED_25000) {
                *width = IB_WIDTH_1X;
                *speed = IB_SPEED_EDR;
        } else if (netdev_speed <= SPEED_40000) {
                *width = IB_WIDTH_4X;
                *speed = IB_SPEED_FDR10;
        } else {
                *width = IB_WIDTH_4X;
                *speed = IB_SPEED_EDR;
        }

        return 0;
}
EXPORT_SYMBOL(ib_get_eth_speed);

int ib_modify_qp(struct ib_qp *qp,
                 struct ib_qp_attr *qp_attr,
                 int qp_attr_mask)
{
        return _ib_modify_qp(qp->real_qp, qp_attr, qp_attr_mask, NULL);
}
EXPORT_SYMBOL(ib_modify_qp);

int ib_query_qp(struct ib_qp *qp,
                struct ib_qp_attr *qp_attr,
                int qp_attr_mask,
                struct ib_qp_init_attr *qp_init_attr)
{
        qp_attr->ah_attr.grh.sgid_attr = NULL;
        qp_attr->alt_ah_attr.grh.sgid_attr = NULL;

        return qp->device->ops.query_qp ?
                qp->device->ops.query_qp(qp->real_qp, qp_attr, qp_attr_mask,
                                         qp_init_attr) : -EOPNOTSUPP;
}
EXPORT_SYMBOL(ib_query_qp);

int ib_close_qp(struct ib_qp *qp)
{
        struct ib_qp *real_qp;
        unsigned long flags;

        real_qp = qp->real_qp;
        if (real_qp == qp)
                return -EINVAL;

        spin_lock_irqsave(&real_qp->device->event_handler_lock, flags);
        list_del(&qp->open_list);
        spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags);

        atomic_dec(&real_qp->usecnt);
        if (qp->qp_sec)
                ib_close_shared_qp_security(qp->qp_sec);
        kfree(qp);

        return 0;
}
EXPORT_SYMBOL(ib_close_qp);

static int __ib_destroy_shared_qp(struct ib_qp *qp)
{
        struct ib_xrcd *xrcd;
        struct ib_qp *real_qp;
        int ret;

        real_qp = qp->real_qp;
        xrcd = real_qp->xrcd;

        mutex_lock(&xrcd->tgt_qp_mutex);
        ib_close_qp(qp);
        if (atomic_read(&real_qp->usecnt) == 0)
                list_del(&real_qp->xrcd_list);
        else
                real_qp = NULL;
        mutex_unlock(&xrcd->tgt_qp_mutex);

        if (real_qp) {
                ret = ib_destroy_qp(real_qp);
                if (!ret)
                        atomic_dec(&xrcd->usecnt);
                else
                        __ib_insert_xrcd_qp(xrcd, real_qp);
        }

        return 0;
}

int ib_destroy_qp_user(struct ib_qp *qp, struct ib_udata *udata)
{
        const struct ib_gid_attr *alt_path_sgid_attr = qp->alt_path_sgid_attr;
        const struct ib_gid_attr *av_sgid_attr = qp->av_sgid_attr;
        struct ib_pd *pd;
        struct ib_cq *scq, *rcq;
        struct ib_srq *srq;
        struct ib_rwq_ind_table *ind_tbl;
        struct ib_qp_security *sec;
        int ret;

        WARN_ON_ONCE(qp->mrs_used > 0);

        if (atomic_read(&qp->usecnt))
                return -EBUSY;

        if (qp->real_qp != qp)
                return __ib_destroy_shared_qp(qp);

        pd   = qp->pd;
        scq  = qp->send_cq;
        rcq  = qp->recv_cq;
        srq  = qp->srq;
        ind_tbl = qp->rwq_ind_tbl;
        sec  = qp->qp_sec;
        if (sec)
                ib_destroy_qp_security_begin(sec);

        if (!qp->uobject)
                rdma_rw_cleanup_mrs(qp);

        rdma_counter_unbind_qp(qp, true);
        rdma_restrack_del(&qp->res);
        ret = qp->device->ops.destroy_qp(qp, udata);
        if (!ret) {
                if (alt_path_sgid_attr)
                        rdma_put_gid_attr(alt_path_sgid_attr);
                if (av_sgid_attr)
                        rdma_put_gid_attr(av_sgid_attr);
                if (pd)
                        atomic_dec(&pd->usecnt);
                if (scq)
                        atomic_dec(&scq->usecnt);
                if (rcq)
                        atomic_dec(&rcq->usecnt);
                if (srq)
                        atomic_dec(&srq->usecnt);
                if (ind_tbl)
                        atomic_dec(&ind_tbl->usecnt);
                if (sec)
                        ib_destroy_qp_security_end(sec);
        } else {
                if (sec)
                        ib_destroy_qp_security_abort(sec);
        }

        return ret;
}
EXPORT_SYMBOL(ib_destroy_qp_user);

/* Completion queues */

struct ib_cq *__ib_create_cq(struct ib_device *device,
                             ib_comp_handler comp_handler,
                             void (*event_handler)(struct ib_event *, void *),
                             void *cq_context,
                             const struct ib_cq_init_attr *cq_attr,
                             const char *caller)
{
        struct ib_cq *cq;
        int ret;

        cq = rdma_zalloc_drv_obj(device, ib_cq);
        if (!cq)
                return ERR_PTR(-ENOMEM);

        cq->device = device;
        cq->uobject = NULL;
        cq->comp_handler = comp_handler;
        cq->event_handler = event_handler;
        cq->cq_context = cq_context;
        atomic_set(&cq->usecnt, 0);
        cq->res.type = RDMA_RESTRACK_CQ;
        rdma_restrack_set_task(&cq->res, caller);

        ret = device->ops.create_cq(cq, cq_attr, NULL);
        if (ret) {
                kfree(cq);
                return ERR_PTR(ret);
        }

        rdma_restrack_kadd(&cq->res);
        return cq;
}
EXPORT_SYMBOL(__ib_create_cq);

int rdma_set_cq_moderation(struct ib_cq *cq, u16 cq_count, u16 cq_period)
{
        return cq->device->ops.modify_cq ?
                cq->device->ops.modify_cq(cq, cq_count,
                                          cq_period) : -EOPNOTSUPP;
}
EXPORT_SYMBOL(rdma_set_cq_moderation);

int ib_destroy_cq_user(struct ib_cq *cq, struct ib_udata *udata)
{
        if (atomic_read(&cq->usecnt))
                return -EBUSY;

        rdma_restrack_del(&cq->res);
        cq->device->ops.destroy_cq(cq, udata);
        kfree(cq);
        return 0;
}
EXPORT_SYMBOL(ib_destroy_cq_user);

int ib_resize_cq(struct ib_cq *cq, int cqe)
{
        return cq->device->ops.resize_cq ?
                cq->device->ops.resize_cq(cq, cqe, NULL) : -EOPNOTSUPP;
}
EXPORT_SYMBOL(ib_resize_cq);

/* Memory regions */

int ib_dereg_mr_user(struct ib_mr *mr, struct ib_udata *udata)
{
        struct ib_pd *pd = mr->pd;
        struct ib_dm *dm = mr->dm;
        struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
        int ret;

        rdma_restrack_del(&mr->res);
        ret = mr->device->ops.dereg_mr(mr, udata);
        if (!ret) {

                atomic_dec(&pd->usecnt);
                if (dm)
                        atomic_dec(&dm->usecnt);
                kfree(sig_attrs);
        }

        return ret;
}
EXPORT_SYMBOL(ib_dereg_mr_user);

/**
 * ib_alloc_mr_user() - Allocates a memory region
 * @pd:            protection domain associated with the region
 * @mr_type:       memory region type
 * @max_num_sg:    maximum sg entries available for registration.
 * @udata:         user data or null for kernel objects
 *
 * Notes:
 * Memory registeration page/sg lists must not exceed max_num_sg.
 * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed
 * max_num_sg * used_page_size.
 *
 */
struct ib_mr *ib_alloc_mr_user(struct ib_pd *pd, enum ib_mr_type mr_type,
                               u32 max_num_sg, struct ib_udata *udata)
{
        struct ib_mr *mr;

        if (!pd->device->ops.alloc_mr)
                return ERR_PTR(-EOPNOTSUPP);

        if (WARN_ON_ONCE(mr_type == IB_MR_TYPE_INTEGRITY))
                return ERR_PTR(-EINVAL);

        mr = pd->device->ops.alloc_mr(pd, mr_type, max_num_sg, udata);
        if (!IS_ERR(mr)) {
                mr->device  = pd->device;
                mr->pd      = pd;
                mr->dm      = NULL;
                mr->uobject = NULL;
                atomic_inc(&pd->usecnt);
                mr->need_inval = false;
                mr->res.type = RDMA_RESTRACK_MR;
                rdma_restrack_kadd(&mr->res);
                mr->type = mr_type;
                mr->sig_attrs = NULL;
        }

        return mr;
}
EXPORT_SYMBOL(ib_alloc_mr_user);

/**
 * ib_alloc_mr_integrity() - Allocates an integrity memory region
 * @pd:                      protection domain associated with the region
 * @max_num_data_sg:         maximum data sg entries available for registration
 * @max_num_meta_sg:         maximum metadata sg entries available for
 *                           registration
 *
 * Notes:
 * Memory registration page/sg lists must not exceed max_num_sg,
 * also the integrity page/sg lists must not exceed max_num_meta_sg.
 *
 */
struct ib_mr *ib_alloc_mr_integrity(struct ib_pd *pd,
                                    u32 max_num_data_sg,
                                    u32 max_num_meta_sg)
{
        struct ib_mr *mr;
        struct ib_sig_attrs *sig_attrs;

        if (!pd->device->ops.alloc_mr_integrity ||
            !pd->device->ops.map_mr_sg_pi)
                return ERR_PTR(-EOPNOTSUPP);

        if (!max_num_meta_sg)
                return ERR_PTR(-EINVAL);

        sig_attrs = kzalloc(sizeof(struct ib_sig_attrs), GFP_KERNEL);
        if (!sig_attrs)
                return ERR_PTR(-ENOMEM);

        mr = pd->device->ops.alloc_mr_integrity(pd, max_num_data_sg,
                                                max_num_meta_sg);
        if (IS_ERR(mr)) {
                kfree(sig_attrs);
                return mr;
        }

        mr->device = pd->device;
        mr->pd = pd;
        mr->dm = NULL;
        mr->uobject = NULL;
        atomic_inc(&pd->usecnt);
        mr->need_inval = false;
        mr->res.type = RDMA_RESTRACK_MR;
        rdma_restrack_kadd(&mr->res);
        mr->type = IB_MR_TYPE_INTEGRITY;
        mr->sig_attrs = sig_attrs;

        return mr;
}
EXPORT_SYMBOL(ib_alloc_mr_integrity);

/* "Fast" memory regions */

struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
                            int mr_access_flags,
                            struct ib_fmr_attr *fmr_attr)
{
        struct ib_fmr *fmr;

        if (!pd->device->ops.alloc_fmr)
                return ERR_PTR(-EOPNOTSUPP);

        fmr = pd->device->ops.alloc_fmr(pd, mr_access_flags, fmr_attr);
        if (!IS_ERR(fmr)) {
                fmr->device = pd->device;
                fmr->pd     = pd;
                atomic_inc(&pd->usecnt);
        }

        return fmr;
}
EXPORT_SYMBOL(ib_alloc_fmr);

int ib_unmap_fmr(struct list_head *fmr_list)
{
        struct ib_fmr *fmr;

        if (list_empty(fmr_list))
                return 0;

        fmr = list_entry(fmr_list->next, struct ib_fmr, list);
        return fmr->device->ops.unmap_fmr(fmr_list);
}
EXPORT_SYMBOL(ib_unmap_fmr);

int ib_dealloc_fmr(struct ib_fmr *fmr)
{
        struct ib_pd *pd;
        int ret;

        pd = fmr->pd;
        ret = fmr->device->ops.dealloc_fmr(fmr);
        if (!ret)
                atomic_dec(&pd->usecnt);

        return ret;
}
EXPORT_SYMBOL(ib_dealloc_fmr);

/* Multicast groups */

static bool is_valid_mcast_lid(struct ib_qp *qp, u16 lid)
{
        struct ib_qp_init_attr init_attr = {};
        struct ib_qp_attr attr = {};
        int num_eth_ports = 0;
        int port;

        /* If QP state >= init, it is assigned to a port and we can check this
         * port only.
         */
        if (!ib_query_qp(qp, &attr, IB_QP_STATE | IB_QP_PORT, &init_attr)) {
                if (attr.qp_state >= IB_QPS_INIT) {
                        if (rdma_port_get_link_layer(qp->device, attr.port_num) !=
                            IB_LINK_LAYER_INFINIBAND)
                                return true;
                        goto lid_check;
                }
        }

        /* Can't get a quick answer, iterate over all ports */
        for (port = 0; port < qp->device->phys_port_cnt; port++)
                if (rdma_port_get_link_layer(qp->device, port) !=
                    IB_LINK_LAYER_INFINIBAND)
                        num_eth_ports++;

        /* If we have at lease one Ethernet port, RoCE annex declares that
         * multicast LID should be ignored. We can't tell at this step if the
         * QP belongs to an IB or Ethernet port.
         */
        if (num_eth_ports)
                return true;

        /* If all the ports are IB, we can check according to IB spec. */
lid_check:
        return !(lid < be16_to_cpu(IB_MULTICAST_LID_BASE) ||
                 lid == be16_to_cpu(IB_LID_PERMISSIVE));
}

int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
{
        int ret;

        if (!qp->device->ops.attach_mcast)
                return -EOPNOTSUPP;

        if (!rdma_is_multicast_addr((struct in6_addr *)gid->raw) ||
            qp->qp_type != IB_QPT_UD || !is_valid_mcast_lid(qp, lid))
                return -EINVAL;

        ret = qp->device->ops.attach_mcast(qp, gid, lid);
        if (!ret)
                atomic_inc(&qp->usecnt);
        return ret;
}
EXPORT_SYMBOL(ib_attach_mcast);

int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
{
        int ret;

        if (!qp->device->ops.detach_mcast)
                return -EOPNOTSUPP;

        if (!rdma_is_multicast_addr((struct in6_addr *)gid->raw) ||
            qp->qp_type != IB_QPT_UD || !is_valid_mcast_lid(qp, lid))
                return -EINVAL;

        ret = qp->device->ops.detach_mcast(qp, gid, lid);
        if (!ret)
                atomic_dec(&qp->usecnt);
        return ret;
}
EXPORT_SYMBOL(ib_detach_mcast);

struct ib_xrcd *__ib_alloc_xrcd(struct ib_device *device, const char *caller)
{
        struct ib_xrcd *xrcd;

        if (!device->ops.alloc_xrcd)
                return ERR_PTR(-EOPNOTSUPP);

        xrcd = device->ops.alloc_xrcd(device, NULL);
        if (!IS_ERR(xrcd)) {
                xrcd->device = device;
                xrcd->inode = NULL;
                atomic_set(&xrcd->usecnt, 0);
                mutex_init(&xrcd->tgt_qp_mutex);
                INIT_LIST_HEAD(&xrcd->tgt_qp_list);
        }

        return xrcd;
}
EXPORT_SYMBOL(__ib_alloc_xrcd);

int ib_dealloc_xrcd(struct ib_xrcd *xrcd, struct ib_udata *udata)
{
        struct ib_qp *qp;
        int ret;

        if (atomic_read(&xrcd->usecnt))
                return -EBUSY;

        while (!list_empty(&xrcd->tgt_qp_list)) {
                qp = list_entry(xrcd->tgt_qp_list.next, struct ib_qp, xrcd_list);
                ret = ib_destroy_qp(qp);
                if (ret)
                        return ret;
        }
        mutex_destroy(&xrcd->tgt_qp_mutex);

        return xrcd->device->ops.dealloc_xrcd(xrcd, udata);
}
EXPORT_SYMBOL(ib_dealloc_xrcd);

/**
 * ib_create_wq - Creates a WQ associated with the specified protection
 * domain.
 * @pd: The protection domain associated with the WQ.
 * @wq_attr: A list of initial attributes required to create the
 * WQ. If WQ creation succeeds, then the attributes are updated to
 * the actual capabilities of the created WQ.
 *
 * wq_attr->max_wr and wq_attr->max_sge determine
 * the requested size of the WQ, and set to the actual values allocated
 * on return.
 * If ib_create_wq() succeeds, then max_wr and max_sge will always be
 * at least as large as the requested values.
 */
struct ib_wq *ib_create_wq(struct ib_pd *pd,
                           struct ib_wq_init_attr *wq_attr)
{
        struct ib_wq *wq;

        if (!pd->device->ops.create_wq)
                return ERR_PTR(-EOPNOTSUPP);

        wq = pd->device->ops.create_wq(pd, wq_attr, NULL);
        if (!IS_ERR(wq)) {
                wq->event_handler = wq_attr->event_handler;
                wq->wq_context = wq_attr->wq_context;
                wq->wq_type = wq_attr->wq_type;
                wq->cq = wq_attr->cq;
                wq->device = pd->device;
                wq->pd = pd;
                wq->uobject = NULL;
                atomic_inc(&pd->usecnt);
                atomic_inc(&wq_attr->cq->usecnt);
                atomic_set(&wq->usecnt, 0);
        }
        return wq;
}
EXPORT_SYMBOL(ib_create_wq);

/**
 * ib_destroy_wq - Destroys the specified user WQ.
 * @wq: The WQ to destroy.
 * @udata: Valid user data
 */
int ib_destroy_wq(struct ib_wq *wq, struct ib_udata *udata)
{
        struct ib_cq *cq = wq->cq;
        struct ib_pd *pd = wq->pd;

        if (atomic_read(&wq->usecnt))
                return -EBUSY;

        wq->device->ops.destroy_wq(wq, udata);
        atomic_dec(&pd->usecnt);
        atomic_dec(&cq->usecnt);

        return 0;
}
EXPORT_SYMBOL(ib_destroy_wq);

/**
 * ib_modify_wq - Modifies the specified WQ.
 * @wq: The WQ to modify.
 * @wq_attr: On input, specifies the WQ attributes to modify.
 * @wq_attr_mask: A bit-mask used to specify which attributes of the WQ
 *   are being modified.
 * On output, the current values of selected WQ attributes are returned.
 */
int ib_modify_wq(struct ib_wq *wq, struct ib_wq_attr *wq_attr,
                 u32 wq_attr_mask)
{
        int err;

        if (!wq->device->ops.modify_wq)
                return -EOPNOTSUPP;

        err = wq->device->ops.modify_wq(wq, wq_attr, wq_attr_mask, NULL);
        return err;
}
EXPORT_SYMBOL(ib_modify_wq);

/*
 * ib_create_rwq_ind_table - Creates a RQ Indirection Table.
 * @device: The device on which to create the rwq indirection table.
 * @ib_rwq_ind_table_init_attr: A list of initial attributes required to
 * create the Indirection Table.
 *
 * Note: The life time of ib_rwq_ind_table_init_attr->ind_tbl is not less
 *      than the created ib_rwq_ind_table object and the caller is responsible
 *      for its memory allocation/free.
 */
struct ib_rwq_ind_table *ib_create_rwq_ind_table(struct ib_device *device,
                                                 struct ib_rwq_ind_table_init_attr *init_attr)
{
        struct ib_rwq_ind_table *rwq_ind_table;
        int i;
        u32 table_size;

        if (!device->ops.create_rwq_ind_table)
                return ERR_PTR(-EOPNOTSUPP);

        table_size = (1 << init_attr->log_ind_tbl_size);
        rwq_ind_table = device->ops.create_rwq_ind_table(device,
                                                         init_attr, NULL);
        if (IS_ERR(rwq_ind_table))
                return rwq_ind_table;

        rwq_ind_table->ind_tbl = init_attr->ind_tbl;
        rwq_ind_table->log_ind_tbl_size = init_attr->log_ind_tbl_size;
        rwq_ind_table->device = device;
        rwq_ind_table->uobject = NULL;
        atomic_set(&rwq_ind_table->usecnt, 0);

        for (i = 0; i < table_size; i++)
                atomic_inc(&rwq_ind_table->ind_tbl[i]->usecnt);

        return rwq_ind_table;
}
EXPORT_SYMBOL(ib_create_rwq_ind_table);

/*
 * ib_destroy_rwq_ind_table - Destroys the specified Indirection Table.
 * @wq_ind_table: The Indirection Table to destroy.
*/
int ib_destroy_rwq_ind_table(struct ib_rwq_ind_table *rwq_ind_table)
{
        int err, i;
        u32 table_size = (1 << rwq_ind_table->log_ind_tbl_size);
        struct ib_wq **ind_tbl = rwq_ind_table->ind_tbl;

        if (atomic_read(&rwq_ind_table->usecnt))
                return -EBUSY;

        err = rwq_ind_table->device->ops.destroy_rwq_ind_table(rwq_ind_table);
        if (!err) {
                for (i = 0; i < table_size; i++)
                        atomic_dec(&ind_tbl[i]->usecnt);
        }

        return err;
}
EXPORT_SYMBOL(ib_destroy_rwq_ind_table);

int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
                       struct ib_mr_status *mr_status)
{
        if (!mr->device->ops.check_mr_status)
                return -EOPNOTSUPP;

        return mr->device->ops.check_mr_status(mr, check_mask, mr_status);
}
EXPORT_SYMBOL(ib_check_mr_status);

int ib_set_vf_link_state(struct ib_device *device, int vf, u8 port,
                         int state)
{
        if (!device->ops.set_vf_link_state)
                return -EOPNOTSUPP;

        return device->ops.set_vf_link_state(device, vf, port, state);
}
EXPORT_SYMBOL(ib_set_vf_link_state);

int ib_get_vf_config(struct ib_device *device, int vf, u8 port,
                     struct ifla_vf_info *info)
{
        if (!device->ops.get_vf_config)
                return -EOPNOTSUPP;

        return device->ops.get_vf_config(device, vf, port, info);
}
EXPORT_SYMBOL(ib_get_vf_config);

int ib_get_vf_stats(struct ib_device *device, int vf, u8 port,
                    struct ifla_vf_stats *stats)
{
        if (!device->ops.get_vf_stats)
                return -EOPNOTSUPP;

        return device->ops.get_vf_stats(device, vf, port, stats);
}
EXPORT_SYMBOL(ib_get_vf_stats);

int ib_set_vf_guid(struct ib_device *device, int vf, u8 port, u64 guid,
                   int type)
{
        if (!device->ops.set_vf_guid)
                return -EOPNOTSUPP;

        return device->ops.set_vf_guid(device, vf, port, guid, type);
}
EXPORT_SYMBOL(ib_set_vf_guid);

/**
 * ib_map_mr_sg_pi() - Map the dma mapped SG lists for PI (protection
 *     information) and set an appropriate memory region for registration.
 * @mr:             memory region
 * @data_sg:        dma mapped scatterlist for data
 * @data_sg_nents:  number of entries in data_sg
 * @data_sg_offset: offset in bytes into data_sg
 * @meta_sg:        dma mapped scatterlist for metadata
 * @meta_sg_nents:  number of entries in meta_sg
 * @meta_sg_offset: offset in bytes into meta_sg
 * @page_size:      page vector desired page size
 *
 * Constraints:
 * - The MR must be allocated with type IB_MR_TYPE_INTEGRITY.
 *
 * Return: 0 on success.
 *
 * After this completes successfully, the  memory region
 * is ready for registration.
 */
int ib_map_mr_sg_pi(struct ib_mr *mr, struct scatterlist *data_sg,
                    int data_sg_nents, unsigned int *data_sg_offset,
                    struct scatterlist *meta_sg, int meta_sg_nents,
                    unsigned int *meta_sg_offset, unsigned int page_size)
{
        if (unlikely(!mr->device->ops.map_mr_sg_pi ||
                     WARN_ON_ONCE(mr->type != IB_MR_TYPE_INTEGRITY)))
                return -EOPNOTSUPP;

        mr->page_size = page_size;

        return mr->device->ops.map_mr_sg_pi(mr, data_sg, data_sg_nents,
                                            data_sg_offset, meta_sg,
                                            meta_sg_nents, meta_sg_offset);
}
EXPORT_SYMBOL(ib_map_mr_sg_pi);

/**
 * ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list
 *     and set it the memory region.
 * @mr:            memory region
 * @sg:            dma mapped scatterlist
 * @sg_nents:      number of entries in sg
 * @sg_offset:     offset in bytes into sg
 * @page_size:     page vector desired page size
 *
 * Constraints:
 * - The first sg element is allowed to have an offset.
 * - Each sg element must either be aligned to page_size or virtually
 *   contiguous to the previous element. In case an sg element has a
 *   non-contiguous offset, the mapping prefix will not include it.
 * - The last sg element is allowed to have length less than page_size.
 * - If sg_nents total byte length exceeds the mr max_num_sge * page_size
 *   then only max_num_sg entries will be mapped.
 * - If the MR was allocated with type IB_MR_TYPE_SG_GAPS, none of these
 *   constraints holds and the page_size argument is ignored.
 *
 * Returns the number of sg elements that were mapped to the memory region.
 *
 * After this completes successfully, the  memory region
 * is ready for registration.
 */
int ib_map_mr_sg(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
                 unsigned int *sg_offset, unsigned int page_size)
{
        if (unlikely(!mr->device->ops.map_mr_sg))
                return -EOPNOTSUPP;

        mr->page_size = page_size;

        return mr->device->ops.map_mr_sg(mr, sg, sg_nents, sg_offset);
}
EXPORT_SYMBOL(ib_map_mr_sg);

/**
 * ib_sg_to_pages() - Convert the largest prefix of a sg list
 *     to a page vector
 * @mr:            memory region
 * @sgl:           dma mapped scatterlist
 * @sg_nents:      number of entries in sg
 * @sg_offset_p:   IN:  start offset in bytes into sg
 *                 OUT: offset in bytes for element n of the sg of the first
 *                      byte that has not been processed where n is the return
 *                      value of this function.
 * @set_page:      driver page assignment function pointer
 *
 * Core service helper for drivers to convert the largest
 * prefix of given sg list to a page vector. The sg list
 * prefix converted is the prefix that meet the requirements
 * of ib_map_mr_sg.
 *
 * Returns the number of sg elements that were assigned to
 * a page vector.
 */
int ib_sg_to_pages(struct ib_mr *mr, struct scatterlist *sgl, int sg_nents,
                unsigned int *sg_offset_p, int (*set_page)(struct ib_mr *, u64))
{
        struct scatterlist *sg;
        u64 last_end_dma_addr = 0;
        unsigned int sg_offset = sg_offset_p ? *sg_offset_p : 0;
        unsigned int last_page_off = 0;
        u64 page_mask = ~((u64)mr->page_size - 1);
        int i, ret;

        if (unlikely(sg_nents <= 0 || sg_offset > sg_dma_len(&sgl[0])))
                return -EINVAL;

        mr->iova = sg_dma_address(&sgl[0]) + sg_offset;
        mr->length = 0;

        for_each_sg(sgl, sg, sg_nents, i) {
                u64 dma_addr = sg_dma_address(sg) + sg_offset;
                u64 prev_addr = dma_addr;
                unsigned int dma_len = sg_dma_len(sg) - sg_offset;
                u64 end_dma_addr = dma_addr + dma_len;
                u64 page_addr = dma_addr & page_mask;

                /*
                 * For the second and later elements, check whether either the
                 * end of element i-1 or the start of element i is not aligned
                 * on a page boundary.
                 */
                if (i && (last_page_off != 0 || page_addr != dma_addr)) {
                        /* Stop mapping if there is a gap. */
                        if (last_end_dma_addr != dma_addr)
                                break;

                        /*
                         * Coalesce this element with the last. If it is small
                         * enough just update mr->length. Otherwise start
                         * mapping from the next page.
                         */
                        goto next_page;
                }

                do {
                        ret = set_page(mr, page_addr);
                        if (unlikely(ret < 0)) {
                                sg_offset = prev_addr - sg_dma_address(sg);
                                mr->length += prev_addr - dma_addr;
                                if (sg_offset_p)
                                        *sg_offset_p = sg_offset;
                                return i || sg_offset ? i : ret;
                        }
                        prev_addr = page_addr;
next_page:
                        page_addr += mr->page_size;
                } while (page_addr < end_dma_addr);

                mr->length += dma_len;
                last_end_dma_addr = end_dma_addr;
                last_page_off = end_dma_addr & ~page_mask;

                sg_offset = 0;
        }

        if (sg_offset_p)
                *sg_offset_p = 0;
        return i;
}
EXPORT_SYMBOL(ib_sg_to_pages);

struct ib_drain_cqe {
        struct ib_cqe cqe;
        struct completion done;
};

static void ib_drain_qp_done(struct ib_cq *cq, struct ib_wc *wc)
{
        struct ib_drain_cqe *cqe = container_of(wc->wr_cqe, struct ib_drain_cqe,
                                                cqe);

        complete(&cqe->done);
}

/*
 * Post a WR and block until its completion is reaped for the SQ.
 */
static void __ib_drain_sq(struct ib_qp *qp)
{
        struct ib_cq *cq = qp->send_cq;
        struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
        struct ib_drain_cqe sdrain;
        struct ib_rdma_wr swr = {
                .wr = {
                        .next = NULL,
                        { .wr_cqe       = &sdrain.cqe, },
                        .opcode = IB_WR_RDMA_WRITE,
                },
        };
        int ret;

        ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
        if (ret) {
                WARN_ONCE(ret, "failed to drain send queue: %d\n", ret);
                return;
        }

        sdrain.cqe.done = ib_drain_qp_done;
        init_completion(&sdrain.done);

        ret = ib_post_send(qp, &swr.wr, NULL);
        if (ret) {
                WARN_ONCE(ret, "failed to drain send queue: %d\n", ret);
                return;
        }

        if (cq->poll_ctx == IB_POLL_DIRECT)
                while (wait_for_completion_timeout(&sdrain.done, HZ / 10) <= 0)
                        ib_process_cq_direct(cq, -1);
        else
                wait_for_completion(&sdrain.done);
}

/*
 * Post a WR and block until its completion is reaped for the RQ.
 */
static void __ib_drain_rq(struct ib_qp *qp)
{
        struct ib_cq *cq = qp->recv_cq;
        struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
        struct ib_drain_cqe rdrain;
        struct ib_recv_wr rwr = {};
        int ret;

        ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
        if (ret) {
                WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret);
                return;
        }

        rwr.wr_cqe = &rdrain.cqe;
        rdrain.cqe.done = ib_drain_qp_done;
        init_completion(&rdrain.done);

        ret = ib_post_recv(qp, &rwr, NULL);
        if (ret) {
                WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret);
                return;
        }

        if (cq->poll_ctx == IB_POLL_DIRECT)
                while (wait_for_completion_timeout(&rdrain.done, HZ / 10) <= 0)
                        ib_process_cq_direct(cq, -1);
        else
                wait_for_completion(&rdrain.done);
}

/**
 * ib_drain_sq() - Block until all SQ CQEs have been consumed by the
 *                 application.
 * @qp:            queue pair to drain
 *
 * If the device has a provider-specific drain function, then
 * call that.  Otherwise call the generic drain function
 * __ib_drain_sq().
 *
 * The caller must:
 *
 * ensure there is room in the CQ and SQ for the drain work request and
 * completion.
 *
 * allocate the CQ using ib_alloc_cq().
 *
 * ensure that there are no other contexts that are posting WRs concurrently.
 * Otherwise the drain is not guaranteed.
 */
void ib_drain_sq(struct ib_qp *qp)
{
        if (qp->device->ops.drain_sq)
                qp->device->ops.drain_sq(qp);
        else
                __ib_drain_sq(qp);
}
EXPORT_SYMBOL(ib_drain_sq);

/**
 * ib_drain_rq() - Block until all RQ CQEs have been consumed by the
 *                 application.
 * @qp:            queue pair to drain
 *
 * If the device has a provider-specific drain function, then
 * call that.  Otherwise call the generic drain function
 * __ib_drain_rq().
 *
 * The caller must:
 *
 * ensure there is room in the CQ and RQ for the drain work request and
 * completion.
 *
 * allocate the CQ using ib_alloc_cq().
 *
 * ensure that there are no other contexts that are posting WRs concurrently.
 * Otherwise the drain is not guaranteed.
 */
void ib_drain_rq(struct ib_qp *qp)
{
        if (qp->device->ops.drain_rq)
                qp->device->ops.drain_rq(qp);
        else
                __ib_drain_rq(qp);
}
EXPORT_SYMBOL(ib_drain_rq);

/**
 * ib_drain_qp() - Block until all CQEs have been consumed by the
 *                 application on both the RQ and SQ.
 * @qp:            queue pair to drain
 *
 * The caller must:
 *
 * ensure there is room in the CQ(s), SQ, and RQ for drain work requests
 * and completions.
 *
 * allocate the CQs using ib_alloc_cq().
 *
 * ensure that there are no other contexts that are posting WRs concurrently.
 * Otherwise the drain is not guaranteed.
 */
void ib_drain_qp(struct ib_qp *qp)
{
        ib_drain_sq(qp);
        if (!qp->srq)
                ib_drain_rq(qp);
}
EXPORT_SYMBOL(ib_drain_qp);

struct net_device *rdma_alloc_netdev(struct ib_device *device, u8 port_num,
                                     enum rdma_netdev_t type, const char *name,
                                     unsigned char name_assign_type,
                                     void (*setup)(struct net_device *))
{
        struct rdma_netdev_alloc_params params;
        struct net_device *netdev;
        int rc;

        if (!device->ops.rdma_netdev_get_params)
                return ERR_PTR(-EOPNOTSUPP);

        rc = device->ops.rdma_netdev_get_params(device, port_num, type,
                                                &params);
        if (rc)
                return ERR_PTR(rc);

        netdev = alloc_netdev_mqs(params.sizeof_priv, name, name_assign_type,
                                  setup, params.txqs, params.rxqs);
        if (!netdev)
                return ERR_PTR(-ENOMEM);

        return netdev;
}
EXPORT_SYMBOL(rdma_alloc_netdev);

int rdma_init_netdev(struct ib_device *device, u8 port_num,
                     enum rdma_netdev_t type, const char *name,
                     unsigned char name_assign_type,
                     void (*setup)(struct net_device *),
                     struct net_device *netdev)
{
        struct rdma_netdev_alloc_params params;
        int rc;

        if (!device->ops.rdma_netdev_get_params)
                return -EOPNOTSUPP;

        rc = device->ops.rdma_netdev_get_params(device, port_num, type,
                                                &params);
        if (rc)
                return rc;

        return params.initialize_rdma_netdev(device, port_num,
                                             netdev, params.param);
}
EXPORT_SYMBOL(rdma_init_netdev);

void __rdma_block_iter_start(struct ib_block_iter *biter,
                             struct scatterlist *sglist, unsigned int nents,
                             unsigned long pgsz)
{
        memset(biter, 0, sizeof(struct ib_block_iter));
        biter->__sg = sglist;
        biter->__sg_nents = nents;

        /* Driver provides best block size to use */
        biter->__pg_bit = __fls(pgsz);
}
EXPORT_SYMBOL(__rdma_block_iter_start);

bool __rdma_block_iter_next(struct ib_block_iter *biter)
{
        unsigned int block_offset;

        if (!biter->__sg_nents || !biter->__sg)
                return false;

        biter->__dma_addr = sg_dma_address(biter->__sg) + biter->__sg_advance;
        block_offset = biter->__dma_addr & (BIT_ULL(biter->__pg_bit) - 1);
        biter->__sg_advance += BIT_ULL(biter->__pg_bit) - block_offset;

        if (biter->__sg_advance >= sg_dma_len(biter->__sg)) {
                biter->__sg_advance = 0;
                biter->__sg = sg_next(biter->__sg);
                biter->__sg_nents--;
        }

        return true;
}
EXPORT_SYMBOL(__rdma_block_iter_next);