OSCL-LXR linux-6.0.1/​drivers/​infiniband/​core/​verbs.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * 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 <rdma/lag.h>
 
 #include "core_priv.h"
 #include <trace/events/rdma_core.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 bind operation error",
     [IB_WC_BAD_RESP_ERR]        = "bad response error",
     [IB_WC_LOC_ACCESS_ERR]      = "local access error",
     [IB_WC_REM_INV_REQ_ERR]     = "remote 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,
                           u32 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.
  * @flags: protection domain flags
  * @caller: caller's build-time module name
  *
  * 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->flags = flags;
 
     rdma_restrack_new(&pd->res, RDMA_RESTRACK_PD);
     rdma_restrack_set_name(&pd->res, caller);
 
     ret = device->ops.alloc_pd(pd, NULL);
     if (ret) {
         rdma_restrack_put(&pd->res);
         kfree(pd);
         return ERR_PTR(ret);
     }
     rdma_restrack_add(&pd->res);
 
     if (device->attrs.kernel_cap_flags & IBK_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.kernel_cap_flags & IBK_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.
  */
 int 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;
     }
 
     ret = pd->device->ops.dealloc_pd(pd, udata);
     if (ret)
         return ret;
 
     rdma_restrack_del(&pd->res);
     kfree(pd);
     return ret;
 }
 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 net_device *xmit_slave)
 {
     struct rdma_ah_init_attr init_attr = {};
     struct ib_device *device = pd->device;
     struct ib_ah *ah;
     int ret;
 
     might_sleep_if(flags & RDMA_CREATE_AH_SLEEPABLE);
 
     if (!udata && !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);
     init_attr.ah_attr = ah_attr;
     init_attr.flags = flags;
     init_attr.xmit_slave = xmit_slave;
 
     if (udata)
         ret = device->ops.create_user_ah(ah, &init_attr, udata);
     else
         ret = device->ops.create_ah(ah, &init_attr, NULL);
     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 net_device *slave;
     struct ib_ah *ah;
     int ret;
 
     ret = rdma_fill_sgid_attr(pd->device, ah_attr, &old_sgid_attr);
     if (ret)
         return ERR_PTR(ret);
     slave = rdma_lag_get_ah_roce_slave(pd->device, ah_attr,
                        (flags & RDMA_CREATE_AH_SLEEPABLE) ?
                        GFP_KERNEL : GFP_ATOMIC);
     if (IS_ERR(slave)) {
         rdma_unfill_sgid_attr(ah_attr, old_sgid_attr);
         return (void *)slave;
     }
     ah = _rdma_create_ah(pd, ah_attr, flags, NULL, slave);
     rdma_lag_put_ah_roce_slave(slave);
     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, NULL);
 
 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,
                              u32 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, u32 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 || RDMA_NETWORK_ROCE_V1) {
         *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, u32 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, u32 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;
     int ret;
 
     might_sleep_if(flags & RDMA_DESTROY_AH_SLEEPABLE);
 
     pd = ah->pd;
 
     ret = ah->device->ops.destroy_ah(ah, flags);
     if (ret)
         return ret;
 
     atomic_dec(&pd->usecnt);
     if (sgid_attr)
         rdma_put_gid_attr(sgid_attr);
 
     kfree(ah);
     return ret;
 }
 EXPORT_SYMBOL(rdma_destroy_ah_user);
 
 /* Shared receive queues */
 
 /**
  * ib_create_srq_user - Creates a SRQ associated with the specified protection
  *   domain.
  * @pd: The protection domain associated with the SRQ.
  * @srq_init_attr: A list of initial attributes required to create the
  *   SRQ.  If SRQ creation succeeds, then the attributes are updated to
  *   the actual capabilities of the created SRQ.
  * @uobject: uobject pointer if this is not a kernel SRQ
  * @udata: udata pointer if this is not a kernel SRQ
  *
  * srq_attr->max_wr and srq_attr->max_sge are read the determine the
  * requested size of the SRQ, and set to the actual values allocated
  * on return.  If ib_create_srq() succeeds, then max_wr and max_sge
  * will always be at least as large as the requested values.
  */
 struct ib_srq *ib_create_srq_user(struct ib_pd *pd,
                   struct ib_srq_init_attr *srq_init_attr,
                   struct ib_usrq_object *uobject,
                   struct ib_udata *udata)
 {
     struct ib_srq *srq;
     int ret;
 
     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;
     srq->uobject = uobject;
 
     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;
         if (srq->ext.xrc.xrcd)
             atomic_inc(&srq->ext.xrc.xrcd->usecnt);
     }
     atomic_inc(&pd->usecnt);
 
     rdma_restrack_new(&srq->res, RDMA_RESTRACK_SRQ);
     rdma_restrack_parent_name(&srq->res, &pd->res);
 
     ret = pd->device->ops.create_srq(srq, srq_init_attr, udata);
     if (ret) {
         rdma_restrack_put(&srq->res);
         atomic_dec(&srq->pd->usecnt);
         if (srq->srq_type == IB_SRQT_XRC && srq->ext.xrc.xrcd)
             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);
     }
 
     rdma_restrack_add(&srq->res);
 
     return srq;
 }
 EXPORT_SYMBOL(ib_create_srq_user);
 
 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)
 {
     int ret;
 
     if (atomic_read(&srq->usecnt))
         return -EBUSY;
 
     ret = srq->device->ops.destroy_srq(srq, udata);
     if (ret)
         return ret;
 
     atomic_dec(&srq->pd->usecnt);
     if (srq->srq_type == IB_SRQT_XRC && srq->ext.xrc.xrcd)
         atomic_dec(&srq->ext.xrc.xrcd->usecnt);
     if (ib_srq_has_cq(srq->srq_type))
         atomic_dec(&srq->ext.cq->usecnt);
     rdma_restrack_del(&srq->res);
     kfree(srq);
 
     return ret;
 }
 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->qp_open_list_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->qp_open_list_lock, flags);
 }
 
 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->qp_open_list_lock, flags);
     list_add(&qp->open_list, &real_qp->open_list);
     spin_unlock_irqrestore(&real_qp->device->qp_open_list_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);
 
     down_read(&xrcd->tgt_qps_rwsem);
     real_qp = xa_load(&xrcd->tgt_qps, qp_open_attr->qp_num);
     if (!real_qp) {
         up_read(&xrcd->tgt_qps_rwsem);
         return ERR_PTR(-EINVAL);
     }
     qp = __ib_open_qp(real_qp, qp_open_attr->event_handler,
               qp_open_attr->qp_context);
     up_read(&xrcd->tgt_qps_rwsem);
     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_qp *real_qp = qp;
     int err;
 
     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;
 
     err = xa_err(xa_store(&qp_init_attr->xrcd->tgt_qps, real_qp->qp_num,
                   real_qp, GFP_KERNEL));
     if (err) {
         ib_close_qp(qp);
         return ERR_PTR(err);
     }
     return qp;
 }
 
 static struct ib_qp *create_qp(struct ib_device *dev, struct ib_pd *pd,
                    struct ib_qp_init_attr *attr,
                    struct ib_udata *udata,
                    struct ib_uqp_object *uobj, const char *caller)
 {
     struct ib_udata dummy = {};
     struct ib_qp *qp;
     int ret;
 
     if (!dev->ops.create_qp)
         return ERR_PTR(-EOPNOTSUPP);
 
     qp = rdma_zalloc_drv_obj_numa(dev, ib_qp);
     if (!qp)
         return ERR_PTR(-ENOMEM);
 
     qp->device = dev;
     qp->pd = pd;
     qp->uobject = uobj;
     qp->real_qp = qp;
 
     qp->qp_type = attr->qp_type;
     qp->rwq_ind_tbl = attr->rwq_ind_tbl;
     qp->srq = attr->srq;
     qp->event_handler = attr->event_handler;
     qp->port = attr->port_num;
     qp->qp_context = attr->qp_context;
 
     spin_lock_init(&qp->mr_lock);
     INIT_LIST_HEAD(&qp->rdma_mrs);
     INIT_LIST_HEAD(&qp->sig_mrs);
 
     qp->send_cq = attr->send_cq;
     qp->recv_cq = attr->recv_cq;
 
     rdma_restrack_new(&qp->res, RDMA_RESTRACK_QP);
     WARN_ONCE(!udata && !caller, "Missing kernel QP owner");
     rdma_restrack_set_name(&qp->res, udata ? NULL : caller);
     ret = dev->ops.create_qp(qp, attr, udata);
     if (ret)
         goto err_create;
 
     /*
      * TODO: The mlx4 internally overwrites send_cq and recv_cq.
      * Unfortunately, it is not an easy task to fix that driver.
      */
     qp->send_cq = attr->send_cq;
     qp->recv_cq = attr->recv_cq;
 
     ret = ib_create_qp_security(qp, dev);
     if (ret)
         goto err_security;
 
     rdma_restrack_add(&qp->res);
     return qp;
 
 err_security:
     qp->device->ops.destroy_qp(qp, udata ? &dummy : NULL);
 err_create:
     rdma_restrack_put(&qp->res);
     kfree(qp);
     return ERR_PTR(ret);
 
 }
 
 /**
  * ib_create_qp_user - Creates a QP associated with the specified protection
  *   domain.
  * @dev: IB device
  * @pd: The protection domain associated with the QP.
  * @attr: A list of initial attributes required to create the
  *   QP.  If QP creation succeeds, then the attributes are updated to
  *   the actual capabilities of the created QP.
  * @udata: User data
  * @uobj: uverbs obect
  * @caller: caller's build-time module name
  */
 struct ib_qp *ib_create_qp_user(struct ib_device *dev, struct ib_pd *pd,
                 struct ib_qp_init_attr *attr,
                 struct ib_udata *udata,
                 struct ib_uqp_object *uobj, const char *caller)
 {
     struct ib_qp *qp, *xrc_qp;
 
     if (attr->qp_type == IB_QPT_XRC_TGT)
         qp = create_qp(dev, pd, attr, NULL, NULL, caller);
     else
         qp = create_qp(dev, pd, attr, udata, uobj, NULL);
     if (attr->qp_type != IB_QPT_XRC_TGT || IS_ERR(qp))
         return qp;
 
     xrc_qp = create_xrc_qp_user(qp, attr);
     if (IS_ERR(xrc_qp)) {
         ib_destroy_qp(qp);
         return xrc_qp;
     }
 
     xrc_qp->uobject = uobj;
     return xrc_qp;
 }
 EXPORT_SYMBOL(ib_create_qp_user);
 
 void ib_qp_usecnt_inc(struct ib_qp *qp)
 {
     if (qp->pd)
         atomic_inc(&qp->pd->usecnt);
     if (qp->send_cq)
         atomic_inc(&qp->send_cq->usecnt);
     if (qp->recv_cq)
         atomic_inc(&qp->recv_cq->usecnt);
     if (qp->srq)
         atomic_inc(&qp->srq->usecnt);
     if (qp->rwq_ind_tbl)
         atomic_inc(&qp->rwq_ind_tbl->usecnt);
 }
 EXPORT_SYMBOL(ib_qp_usecnt_inc);
 
 void ib_qp_usecnt_dec(struct ib_qp *qp)
 {
     if (qp->rwq_ind_tbl)
         atomic_dec(&qp->rwq_ind_tbl->usecnt);
     if (qp->srq)
         atomic_dec(&qp->srq->usecnt);
     if (qp->recv_cq)
         atomic_dec(&qp->recv_cq->usecnt);
     if (qp->send_cq)
         atomic_dec(&qp->send_cq->usecnt);
     if (qp->pd)
         atomic_dec(&qp->pd->usecnt);
 }
 EXPORT_SYMBOL(ib_qp_usecnt_dec);
 
 struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd,
                   struct ib_qp_init_attr *qp_init_attr,
                   const char *caller)
 {
     struct ib_device *device = pd->device;
     struct ib_qp *qp;
     int ret;
 
     /*
      * 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 = create_qp(device, pd, qp_init_attr, NULL, NULL, caller);
     if (IS_ERR(qp))
         return qp;
 
     ib_qp_usecnt_inc(qp);
 
     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_kernel);
 
 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)
 {
     u32 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;
 
     attr->xmit_slave = NULL;
     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->ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE &&
             is_qp_type_connected(qp)) {
             struct net_device *slave;
 
             /*
              * If the user provided the qp_attr then we have to
              * resolve it. Kerne users have to provide already
              * resolved rdma_ah_attr's.
              */
             if (udata) {
                 ret = ib_resolve_eth_dmac(qp->device,
                               &attr->ah_attr);
                 if (ret)
                     goto out_av;
             }
             slave = rdma_lag_get_ah_roce_slave(qp->device,
                                &attr->ah_attr,
                                GFP_KERNEL);
             if (IS_ERR(slave)) {
                 ret = PTR_ERR(slave);
                 goto out_av;
             }
             attr->xmit_slave = slave;
         }
     }
     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 (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_lag_put_ah_roce_slave(attr->xmit_slave);
         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, u32 port_num, u16 *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 && lksettings.base.speed != (u32)SPEED_UNKNOWN) {
         netdev_speed = lksettings.base.speed;
     } else {
         netdev_speed = SPEED_1000;
         pr_warn("%s speed is unknown, defaulting to %u\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->qp_open_list_lock, flags);
     list_del(&qp->open_list);
     spin_unlock_irqrestore(&real_qp->device->qp_open_list_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;
     down_write(&xrcd->tgt_qps_rwsem);
     ib_close_qp(qp);
     if (atomic_read(&real_qp->usecnt) == 0)
         xa_erase(&xrcd->tgt_qps, real_qp->qp_num);
     else
         real_qp = NULL;
     up_write(&xrcd->tgt_qps_rwsem);
 
     if (real_qp) {
         ret = ib_destroy_qp(real_qp);
         if (!ret)
             atomic_dec(&xrcd->usecnt);
     }
 
     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_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);
 
     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);
     ret = qp->device->ops.destroy_qp(qp, udata);
     if (ret) {
         if (sec)
             ib_destroy_qp_security_abort(sec);
         return 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);
 
     ib_qp_usecnt_dec(qp);
     if (sec)
         ib_destroy_qp_security_end(sec);
 
     rdma_restrack_del(&qp->res);
     kfree(qp);
     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);
 
     rdma_restrack_new(&cq->res, RDMA_RESTRACK_CQ);
     rdma_restrack_set_name(&cq->res, caller);
 
     ret = device->ops.create_cq(cq, cq_attr, NULL);
     if (ret) {
         rdma_restrack_put(&cq->res);
         kfree(cq);
         return ERR_PTR(ret);
     }
 
     rdma_restrack_add(&cq->res);
     return cq;
 }
 EXPORT_SYMBOL(__ib_create_cq);
 
 int rdma_set_cq_moderation(struct ib_cq *cq, u16 cq_count, u16 cq_period)
 {
     if (cq->shared)
         return -EOPNOTSUPP;
 
     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)
 {
     int ret;
 
     if (WARN_ON_ONCE(cq->shared))
         return -EOPNOTSUPP;
 
     if (atomic_read(&cq->usecnt))
         return -EBUSY;
 
     ret = cq->device->ops.destroy_cq(cq, udata);
     if (ret)
         return ret;
 
     rdma_restrack_del(&cq->res);
     kfree(cq);
     return ret;
 }
 EXPORT_SYMBOL(ib_destroy_cq_user);
 
 int ib_resize_cq(struct ib_cq *cq, int cqe)
 {
     if (cq->shared)
         return -EOPNOTSUPP;
 
     return cq->device->ops.resize_cq ?
         cq->device->ops.resize_cq(cq, cqe, NULL) : -EOPNOTSUPP;
 }
 EXPORT_SYMBOL(ib_resize_cq);
 
 /* Memory regions */
 
 struct ib_mr *ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                  u64 virt_addr, int access_flags)
 {
     struct ib_mr *mr;
 
     if (access_flags & IB_ACCESS_ON_DEMAND) {
         if (!(pd->device->attrs.kernel_cap_flags &
               IBK_ON_DEMAND_PAGING)) {
             pr_debug("ODP support not available\n");
             return ERR_PTR(-EINVAL);
         }
     }
 
     mr = pd->device->ops.reg_user_mr(pd, start, length, virt_addr,
                      access_flags, NULL);
 
     if (IS_ERR(mr))
         return mr;
 
     mr->device = pd->device;
     mr->type = IB_MR_TYPE_USER;
     mr->pd = pd;
     mr->dm = NULL;
     atomic_inc(&pd->usecnt);
 
     rdma_restrack_new(&mr->res, RDMA_RESTRACK_MR);
     rdma_restrack_parent_name(&mr->res, &pd->res);
     rdma_restrack_add(&mr->res);
 
     return mr;
 }
 EXPORT_SYMBOL(ib_reg_user_mr);
 
 int ib_advise_mr(struct ib_pd *pd, enum ib_uverbs_advise_mr_advice advice,
          u32 flags, struct ib_sge *sg_list, u32 num_sge)
 {
     if (!pd->device->ops.advise_mr)
         return -EOPNOTSUPP;
 
     if (!num_sge)
         return 0;
 
     return pd->device->ops.advise_mr(pd, advice, flags, sg_list, num_sge,
                      NULL);
 }
 EXPORT_SYMBOL(ib_advise_mr);
 
 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;
 
     trace_mr_dereg(mr);
     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() - 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.
  *
  * 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(struct ib_pd *pd, enum ib_mr_type mr_type,
               u32 max_num_sg)
 {
     struct ib_mr *mr;
 
     if (!pd->device->ops.alloc_mr) {
         mr = ERR_PTR(-EOPNOTSUPP);
         goto out;
     }
 
     if (mr_type == IB_MR_TYPE_INTEGRITY) {
         WARN_ON_ONCE(1);
         mr = ERR_PTR(-EINVAL);
         goto out;
     }
 
     mr = pd->device->ops.alloc_mr(pd, mr_type, max_num_sg);
     if (IS_ERR(mr))
         goto out;
 
     mr->device = pd->device;
     mr->pd = pd;
     mr->dm = NULL;
     mr->uobject = NULL;
     atomic_inc(&pd->usecnt);
     mr->need_inval = false;
     mr->type = mr_type;
     mr->sig_attrs = NULL;
 
     rdma_restrack_new(&mr->res, RDMA_RESTRACK_MR);
     rdma_restrack_parent_name(&mr->res, &pd->res);
     rdma_restrack_add(&mr->res);
 out:
     trace_mr_alloc(pd, mr_type, max_num_sg, mr);
     return mr;
 }
 EXPORT_SYMBOL(ib_alloc_mr);
 
 /**
  * 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) {
         mr = ERR_PTR(-EOPNOTSUPP);
         goto out;
     }
 
     if (!max_num_meta_sg) {
         mr = ERR_PTR(-EINVAL);
         goto out;
     }
 
     sig_attrs = kzalloc(sizeof(struct ib_sig_attrs), GFP_KERNEL);
     if (!sig_attrs) {
         mr = ERR_PTR(-ENOMEM);
         goto out;
     }
 
     mr = pd->device->ops.alloc_mr_integrity(pd, max_num_data_sg,
                         max_num_meta_sg);
     if (IS_ERR(mr)) {
         kfree(sig_attrs);
         goto out;
     }
 
     mr->device = pd->device;
     mr->pd = pd;
     mr->dm = NULL;
     mr->uobject = NULL;
     atomic_inc(&pd->usecnt);
     mr->need_inval = false;
     mr->type = IB_MR_TYPE_INTEGRITY;
     mr->sig_attrs = sig_attrs;
 
     rdma_restrack_new(&mr->res, RDMA_RESTRACK_MR);
     rdma_restrack_parent_name(&mr->res, &pd->res);
     rdma_restrack_add(&mr->res);
 out:
     trace_mr_integ_alloc(pd, max_num_data_sg, max_num_meta_sg, mr);
     return mr;
 }
 EXPORT_SYMBOL(ib_alloc_mr_integrity);
 
 /* 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;
     unsigned 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 */
     rdma_for_each_port(qp->device, 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);
 
 /**
  * ib_alloc_xrcd_user - Allocates an XRC domain.
  * @device: The device on which to allocate the XRC domain.
  * @inode: inode to connect XRCD
  * @udata: Valid user data or NULL for kernel object
  */
 struct ib_xrcd *ib_alloc_xrcd_user(struct ib_device *device,
                    struct inode *inode, struct ib_udata *udata)
 {
     struct ib_xrcd *xrcd;
     int ret;
 
     if (!device->ops.alloc_xrcd)
         return ERR_PTR(-EOPNOTSUPP);
 
     xrcd = rdma_zalloc_drv_obj(device, ib_xrcd);
     if (!xrcd)
         return ERR_PTR(-ENOMEM);
 
     xrcd->device = device;
     xrcd->inode = inode;
     atomic_set(&xrcd->usecnt, 0);
     init_rwsem(&xrcd->tgt_qps_rwsem);
     xa_init(&xrcd->tgt_qps);
 
     ret = device->ops.alloc_xrcd(xrcd, udata);
     if (ret)
         goto err;
     return xrcd;
 err:
     kfree(xrcd);
     return ERR_PTR(ret);
 }
 EXPORT_SYMBOL(ib_alloc_xrcd_user);
 
 /**
  * ib_dealloc_xrcd_user - Deallocates an XRC domain.
  * @xrcd: The XRC domain to deallocate.
  * @udata: Valid user data or NULL for kernel object
  */
 int ib_dealloc_xrcd_user(struct ib_xrcd *xrcd, struct ib_udata *udata)
 {
     int ret;
 
     if (atomic_read(&xrcd->usecnt))
         return -EBUSY;
 
     WARN_ON(!xa_empty(&xrcd->tgt_qps));
     ret = xrcd->device->ops.dealloc_xrcd(xrcd, udata);
     if (ret)
         return ret;
     kfree(xrcd);
     return ret;
 }
 EXPORT_SYMBOL(ib_dealloc_xrcd_user);
 
 /**
  * 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_user - Destroys the specified user WQ.
  * @wq: The WQ to destroy.
  * @udata: Valid user data
  */
 int ib_destroy_wq_user(struct ib_wq *wq, struct ib_udata *udata)
 {
     struct ib_cq *cq = wq->cq;
     struct ib_pd *pd = wq->pd;
     int ret;
 
     if (atomic_read(&wq->usecnt))
         return -EBUSY;
 
     ret = wq->device->ops.destroy_wq(wq, udata);
     if (ret)
         return ret;
 
     atomic_dec(&pd->usecnt);
     atomic_dec(&cq->usecnt);
     return ret;
 }
 EXPORT_SYMBOL(ib_destroy_wq_user);
 
 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, u32 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, u32 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, u32 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, u32 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);
 
 int ib_get_vf_guid(struct ib_device *device, int vf, u32 port,
            struct ifla_vf_guid *node_guid,
            struct ifla_vf_guid *port_guid)
 {
     if (!device->ops.get_vf_guid)
         return -EOPNOTSUPP;
 
     return device->ops.get_vf_guid(device, vf, port, node_guid, port_guid);
 }
 EXPORT_SYMBOL(ib_get_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);
     trace_cq_drain_complete(qp->send_cq);
 }
 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);
     trace_cq_drain_complete(qp->recv_cq);
 }
 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, u32 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, u32 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);
 
 /**
  * rdma_alloc_hw_stats_struct - Helper function to allocate dynamic struct
  *   for the drivers.
  * @descs: array of static descriptors
  * @num_counters: number of elements in array
  * @lifespan: milliseconds between updates
  */
 struct rdma_hw_stats *rdma_alloc_hw_stats_struct(
     const struct rdma_stat_desc *descs, int num_counters,
     unsigned long lifespan)
 {
     struct rdma_hw_stats *stats;
 
     stats = kzalloc(struct_size(stats, value, num_counters), GFP_KERNEL);
     if (!stats)
         return NULL;
 
     stats->is_disabled = kcalloc(BITS_TO_LONGS(num_counters),
                      sizeof(*stats->is_disabled), GFP_KERNEL);
     if (!stats->is_disabled)
         goto err;
 
     stats->descs = descs;
     stats->num_counters = num_counters;
     stats->lifespan = msecs_to_jiffies(lifespan);
     mutex_init(&stats->lock);
 
     return stats;
 
 err:
     kfree(stats);
     return NULL;
 }
 EXPORT_SYMBOL(rdma_alloc_hw_stats_struct);
 
 /**
  * rdma_free_hw_stats_struct - Helper function to release rdma_hw_stats
  * @stats: statistics to release
  */
 void rdma_free_hw_stats_struct(struct rdma_hw_stats *stats)
 {
     if (!stats)
         return;
 
     kfree(stats->is_disabled);
     kfree(stats);
 }
 EXPORT_SYMBOL(rdma_free_hw_stats_struct);