OSCL-LXR linux-6.0.1/​drivers/​infiniband/​core/​mad.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) 2004-2007 Voltaire, Inc. All rights reserved.
  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
  * Copyright (c) 2009 HNR Consulting. All rights reserved.
  * Copyright (c) 2014,2018 Intel Corporation.  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.
  *
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/security.h>
 #include <linux/xarray.h>
 #include <rdma/ib_cache.h>
 
 #include "mad_priv.h"
 #include "core_priv.h"
 #include "mad_rmpp.h"
 #include "smi.h"
 #include "opa_smi.h"
 #include "agent.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/ib_mad.h>
 
 #ifdef CONFIG_TRACEPOINTS
 static void create_mad_addr_info(struct ib_mad_send_wr_private *mad_send_wr,
               struct ib_mad_qp_info *qp_info,
               struct trace_event_raw_ib_mad_send_template *entry)
 {
     u16 pkey;
     struct ib_device *dev = qp_info->port_priv->device;
     u32 pnum = qp_info->port_priv->port_num;
     struct ib_ud_wr *wr = &mad_send_wr->send_wr;
     struct rdma_ah_attr attr = {};
 
     rdma_query_ah(wr->ah, &attr);
 
     /* These are common */
     entry->sl = attr.sl;
     ib_query_pkey(dev, pnum, wr->pkey_index, &pkey);
     entry->pkey = pkey;
     entry->rqpn = wr->remote_qpn;
     entry->rqkey = wr->remote_qkey;
     entry->dlid = rdma_ah_get_dlid(&attr);
 }
 #endif
 
 static int mad_sendq_size = IB_MAD_QP_SEND_SIZE;
 static int mad_recvq_size = IB_MAD_QP_RECV_SIZE;
 
 module_param_named(send_queue_size, mad_sendq_size, int, 0444);
 MODULE_PARM_DESC(send_queue_size, "Size of send queue in number of work requests");
 module_param_named(recv_queue_size, mad_recvq_size, int, 0444);
 MODULE_PARM_DESC(recv_queue_size, "Size of receive queue in number of work requests");
 
 static DEFINE_XARRAY_ALLOC1(ib_mad_clients);
 static u32 ib_mad_client_next;
 static struct list_head ib_mad_port_list;
 
 /* Port list lock */
 static DEFINE_SPINLOCK(ib_mad_port_list_lock);
 
 /* Forward declarations */
 static int method_in_use(struct ib_mad_mgmt_method_table **method,
              struct ib_mad_reg_req *mad_reg_req);
 static void remove_mad_reg_req(struct ib_mad_agent_private *priv);
 static struct ib_mad_agent_private *find_mad_agent(
                     struct ib_mad_port_private *port_priv,
                     const struct ib_mad_hdr *mad);
 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
                     struct ib_mad_private *mad);
 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv);
 static void timeout_sends(struct work_struct *work);
 static void local_completions(struct work_struct *work);
 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
                   struct ib_mad_agent_private *agent_priv,
                   u8 mgmt_class);
 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
                struct ib_mad_agent_private *agent_priv);
 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
                   struct ib_wc *wc);
 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc);
 
 /*
  * Returns a ib_mad_port_private structure or NULL for a device/port
  * Assumes ib_mad_port_list_lock is being held
  */
 static inline struct ib_mad_port_private *
 __ib_get_mad_port(struct ib_device *device, u32 port_num)
 {
     struct ib_mad_port_private *entry;
 
     list_for_each_entry(entry, &ib_mad_port_list, port_list) {
         if (entry->device == device && entry->port_num == port_num)
             return entry;
     }
     return NULL;
 }
 
 /*
  * Wrapper function to return a ib_mad_port_private structure or NULL
  * for a device/port
  */
 static inline struct ib_mad_port_private *
 ib_get_mad_port(struct ib_device *device, u32 port_num)
 {
     struct ib_mad_port_private *entry;
     unsigned long flags;
 
     spin_lock_irqsave(&ib_mad_port_list_lock, flags);
     entry = __ib_get_mad_port(device, port_num);
     spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 
     return entry;
 }
 
 static inline u8 convert_mgmt_class(u8 mgmt_class)
 {
     /* Alias IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE to 0 */
     return mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE ?
         0 : mgmt_class;
 }
 
 static int get_spl_qp_index(enum ib_qp_type qp_type)
 {
     switch (qp_type) {
     case IB_QPT_SMI:
         return 0;
     case IB_QPT_GSI:
         return 1;
     default:
         return -1;
     }
 }
 
 static int vendor_class_index(u8 mgmt_class)
 {
     return mgmt_class - IB_MGMT_CLASS_VENDOR_RANGE2_START;
 }
 
 static int is_vendor_class(u8 mgmt_class)
 {
     if ((mgmt_class < IB_MGMT_CLASS_VENDOR_RANGE2_START) ||
         (mgmt_class > IB_MGMT_CLASS_VENDOR_RANGE2_END))
         return 0;
     return 1;
 }
 
 static int is_vendor_oui(char *oui)
 {
     if (oui[0] || oui[1] || oui[2])
         return 1;
     return 0;
 }
 
 static int is_vendor_method_in_use(
         struct ib_mad_mgmt_vendor_class *vendor_class,
         struct ib_mad_reg_req *mad_reg_req)
 {
     struct ib_mad_mgmt_method_table *method;
     int i;
 
     for (i = 0; i < MAX_MGMT_OUI; i++) {
         if (!memcmp(vendor_class->oui[i], mad_reg_req->oui, 3)) {
             method = vendor_class->method_table[i];
             if (method) {
                 if (method_in_use(&method, mad_reg_req))
                     return 1;
                 else
                     break;
             }
         }
     }
     return 0;
 }
 
 int ib_response_mad(const struct ib_mad_hdr *hdr)
 {
     return ((hdr->method & IB_MGMT_METHOD_RESP) ||
         (hdr->method == IB_MGMT_METHOD_TRAP_REPRESS) ||
         ((hdr->mgmt_class == IB_MGMT_CLASS_BM) &&
          (hdr->attr_mod & IB_BM_ATTR_MOD_RESP)));
 }
 EXPORT_SYMBOL(ib_response_mad);
 
 /*
  * ib_register_mad_agent - Register to send/receive MADs
  *
  * Context: Process context.
  */
 struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
                        u32 port_num,
                        enum ib_qp_type qp_type,
                        struct ib_mad_reg_req *mad_reg_req,
                        u8 rmpp_version,
                        ib_mad_send_handler send_handler,
                        ib_mad_recv_handler recv_handler,
                        void *context,
                        u32 registration_flags)
 {
     struct ib_mad_port_private *port_priv;
     struct ib_mad_agent *ret = ERR_PTR(-EINVAL);
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_reg_req *reg_req = NULL;
     struct ib_mad_mgmt_class_table *class;
     struct ib_mad_mgmt_vendor_class_table *vendor;
     struct ib_mad_mgmt_vendor_class *vendor_class;
     struct ib_mad_mgmt_method_table *method;
     int ret2, qpn;
     u8 mgmt_class, vclass;
 
     if ((qp_type == IB_QPT_SMI && !rdma_cap_ib_smi(device, port_num)) ||
         (qp_type == IB_QPT_GSI && !rdma_cap_ib_cm(device, port_num)))
         return ERR_PTR(-EPROTONOSUPPORT);
 
     /* Validate parameters */
     qpn = get_spl_qp_index(qp_type);
     if (qpn == -1) {
         dev_dbg_ratelimited(&device->dev, "%s: invalid QP Type %d\n",
                     __func__, qp_type);
         goto error1;
     }
 
     if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION) {
         dev_dbg_ratelimited(&device->dev,
                     "%s: invalid RMPP Version %u\n",
                     __func__, rmpp_version);
         goto error1;
     }
 
     /* Validate MAD registration request if supplied */
     if (mad_reg_req) {
         if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION) {
             dev_dbg_ratelimited(&device->dev,
                         "%s: invalid Class Version %u\n",
                         __func__,
                         mad_reg_req->mgmt_class_version);
             goto error1;
         }
         if (!recv_handler) {
             dev_dbg_ratelimited(&device->dev,
                         "%s: no recv_handler\n", __func__);
             goto error1;
         }
         if (mad_reg_req->mgmt_class >= MAX_MGMT_CLASS) {
             /*
              * IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE is the only
              * one in this range currently allowed
              */
             if (mad_reg_req->mgmt_class !=
                 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
                 dev_dbg_ratelimited(&device->dev,
                     "%s: Invalid Mgmt Class 0x%x\n",
                     __func__, mad_reg_req->mgmt_class);
                 goto error1;
             }
         } else if (mad_reg_req->mgmt_class == 0) {
             /*
              * Class 0 is reserved in IBA and is used for
              * aliasing of IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE
              */
             dev_dbg_ratelimited(&device->dev,
                         "%s: Invalid Mgmt Class 0\n",
                         __func__);
             goto error1;
         } else if (is_vendor_class(mad_reg_req->mgmt_class)) {
             /*
              * If class is in "new" vendor range,
              * ensure supplied OUI is not zero
              */
             if (!is_vendor_oui(mad_reg_req->oui)) {
                 dev_dbg_ratelimited(&device->dev,
                     "%s: No OUI specified for class 0x%x\n",
                     __func__,
                     mad_reg_req->mgmt_class);
                 goto error1;
             }
         }
         /* Make sure class supplied is consistent with RMPP */
         if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
             if (rmpp_version) {
                 dev_dbg_ratelimited(&device->dev,
                     "%s: RMPP version for non-RMPP class 0x%x\n",
                     __func__, mad_reg_req->mgmt_class);
                 goto error1;
             }
         }
 
         /* Make sure class supplied is consistent with QP type */
         if (qp_type == IB_QPT_SMI) {
             if ((mad_reg_req->mgmt_class !=
                     IB_MGMT_CLASS_SUBN_LID_ROUTED) &&
                 (mad_reg_req->mgmt_class !=
                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
                 dev_dbg_ratelimited(&device->dev,
                     "%s: Invalid SM QP type: class 0x%x\n",
                     __func__, mad_reg_req->mgmt_class);
                 goto error1;
             }
         } else {
             if ((mad_reg_req->mgmt_class ==
                     IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
                 (mad_reg_req->mgmt_class ==
                     IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
                 dev_dbg_ratelimited(&device->dev,
                     "%s: Invalid GS QP type: class 0x%x\n",
                     __func__, mad_reg_req->mgmt_class);
                 goto error1;
             }
         }
     } else {
         /* No registration request supplied */
         if (!send_handler)
             goto error1;
         if (registration_flags & IB_MAD_USER_RMPP)
             goto error1;
     }
 
     /* Validate device and port */
     port_priv = ib_get_mad_port(device, port_num);
     if (!port_priv) {
         dev_dbg_ratelimited(&device->dev, "%s: Invalid port %u\n",
                     __func__, port_num);
         ret = ERR_PTR(-ENODEV);
         goto error1;
     }
 
     /* Verify the QP requested is supported. For example, Ethernet devices
      * will not have QP0.
      */
     if (!port_priv->qp_info[qpn].qp) {
         dev_dbg_ratelimited(&device->dev, "%s: QP %d not supported\n",
                     __func__, qpn);
         ret = ERR_PTR(-EPROTONOSUPPORT);
         goto error1;
     }
 
     /* Allocate structures */
     mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
     if (!mad_agent_priv) {
         ret = ERR_PTR(-ENOMEM);
         goto error1;
     }
 
     if (mad_reg_req) {
         reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
         if (!reg_req) {
             ret = ERR_PTR(-ENOMEM);
             goto error3;
         }
     }
 
     /* Now, fill in the various structures */
     mad_agent_priv->qp_info = &port_priv->qp_info[qpn];
     mad_agent_priv->reg_req = reg_req;
     mad_agent_priv->agent.rmpp_version = rmpp_version;
     mad_agent_priv->agent.device = device;
     mad_agent_priv->agent.recv_handler = recv_handler;
     mad_agent_priv->agent.send_handler = send_handler;
     mad_agent_priv->agent.context = context;
     mad_agent_priv->agent.qp = port_priv->qp_info[qpn].qp;
     mad_agent_priv->agent.port_num = port_num;
     mad_agent_priv->agent.flags = registration_flags;
     spin_lock_init(&mad_agent_priv->lock);
     INIT_LIST_HEAD(&mad_agent_priv->send_list);
     INIT_LIST_HEAD(&mad_agent_priv->wait_list);
     INIT_LIST_HEAD(&mad_agent_priv->done_list);
     INIT_LIST_HEAD(&mad_agent_priv->rmpp_list);
     INIT_DELAYED_WORK(&mad_agent_priv->timed_work, timeout_sends);
     INIT_LIST_HEAD(&mad_agent_priv->local_list);
     INIT_WORK(&mad_agent_priv->local_work, local_completions);
     refcount_set(&mad_agent_priv->refcount, 1);
     init_completion(&mad_agent_priv->comp);
 
     ret2 = ib_mad_agent_security_setup(&mad_agent_priv->agent, qp_type);
     if (ret2) {
         ret = ERR_PTR(ret2);
         goto error4;
     }
 
     /*
      * The mlx4 driver uses the top byte to distinguish which virtual
      * function generated the MAD, so we must avoid using it.
      */
     ret2 = xa_alloc_cyclic(&ib_mad_clients, &mad_agent_priv->agent.hi_tid,
             mad_agent_priv, XA_LIMIT(0, (1 << 24) - 1),
             &ib_mad_client_next, GFP_KERNEL);
     if (ret2 < 0) {
         ret = ERR_PTR(ret2);
         goto error5;
     }
 
     /*
      * Make sure MAD registration (if supplied)
      * is non overlapping with any existing ones
      */
     spin_lock_irq(&port_priv->reg_lock);
     if (mad_reg_req) {
         mgmt_class = convert_mgmt_class(mad_reg_req->mgmt_class);
         if (!is_vendor_class(mgmt_class)) {
             class = port_priv->version[mad_reg_req->
                            mgmt_class_version].class;
             if (class) {
                 method = class->method_table[mgmt_class];
                 if (method) {
                     if (method_in_use(&method,
                                mad_reg_req))
                         goto error6;
                 }
             }
             ret2 = add_nonoui_reg_req(mad_reg_req, mad_agent_priv,
                           mgmt_class);
         } else {
             /* "New" vendor class range */
             vendor = port_priv->version[mad_reg_req->
                             mgmt_class_version].vendor;
             if (vendor) {
                 vclass = vendor_class_index(mgmt_class);
                 vendor_class = vendor->vendor_class[vclass];
                 if (vendor_class) {
                     if (is_vendor_method_in_use(
                             vendor_class,
                             mad_reg_req))
                         goto error6;
                 }
             }
             ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
         }
         if (ret2) {
             ret = ERR_PTR(ret2);
             goto error6;
         }
     }
     spin_unlock_irq(&port_priv->reg_lock);
 
     trace_ib_mad_create_agent(mad_agent_priv);
     return &mad_agent_priv->agent;
 error6:
     spin_unlock_irq(&port_priv->reg_lock);
     xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
 error5:
     ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
 error4:
     kfree(reg_req);
 error3:
     kfree(mad_agent_priv);
 error1:
     return ret;
 }
 EXPORT_SYMBOL(ib_register_mad_agent);
 
 static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 {
     if (refcount_dec_and_test(&mad_agent_priv->refcount))
         complete(&mad_agent_priv->comp);
 }
 
 static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
 {
     struct ib_mad_port_private *port_priv;
 
     /* Note that we could still be handling received MADs */
     trace_ib_mad_unregister_agent(mad_agent_priv);
 
     /*
      * Canceling all sends results in dropping received response
      * MADs, preventing us from queuing additional work
      */
     cancel_mads(mad_agent_priv);
     port_priv = mad_agent_priv->qp_info->port_priv;
     cancel_delayed_work(&mad_agent_priv->timed_work);
 
     spin_lock_irq(&port_priv->reg_lock);
     remove_mad_reg_req(mad_agent_priv);
     spin_unlock_irq(&port_priv->reg_lock);
     xa_erase(&ib_mad_clients, mad_agent_priv->agent.hi_tid);
 
     flush_workqueue(port_priv->wq);
 
     deref_mad_agent(mad_agent_priv);
     wait_for_completion(&mad_agent_priv->comp);
     ib_cancel_rmpp_recvs(mad_agent_priv);
 
     ib_mad_agent_security_cleanup(&mad_agent_priv->agent);
 
     kfree(mad_agent_priv->reg_req);
     kfree_rcu(mad_agent_priv, rcu);
 }
 
 /*
  * ib_unregister_mad_agent - Unregisters a client from using MAD services
  *
  * Context: Process context.
  */
 void ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
 {
     struct ib_mad_agent_private *mad_agent_priv;
 
     mad_agent_priv = container_of(mad_agent,
                       struct ib_mad_agent_private,
                       agent);
     unregister_mad_agent(mad_agent_priv);
 }
 EXPORT_SYMBOL(ib_unregister_mad_agent);
 
 static void dequeue_mad(struct ib_mad_list_head *mad_list)
 {
     struct ib_mad_queue *mad_queue;
     unsigned long flags;
 
     mad_queue = mad_list->mad_queue;
     spin_lock_irqsave(&mad_queue->lock, flags);
     list_del(&mad_list->list);
     mad_queue->count--;
     spin_unlock_irqrestore(&mad_queue->lock, flags);
 }
 
 static void build_smp_wc(struct ib_qp *qp, struct ib_cqe *cqe, u16 slid,
         u16 pkey_index, u32 port_num, struct ib_wc *wc)
 {
     memset(wc, 0, sizeof *wc);
     wc->wr_cqe = cqe;
     wc->status = IB_WC_SUCCESS;
     wc->opcode = IB_WC_RECV;
     wc->pkey_index = pkey_index;
     wc->byte_len = sizeof(struct ib_mad) + sizeof(struct ib_grh);
     wc->src_qp = IB_QP0;
     wc->qp = qp;
     wc->slid = slid;
     wc->sl = 0;
     wc->dlid_path_bits = 0;
     wc->port_num = port_num;
 }
 
 static size_t mad_priv_size(const struct ib_mad_private *mp)
 {
     return sizeof(struct ib_mad_private) + mp->mad_size;
 }
 
 static struct ib_mad_private *alloc_mad_private(size_t mad_size, gfp_t flags)
 {
     size_t size = sizeof(struct ib_mad_private) + mad_size;
     struct ib_mad_private *ret = kzalloc(size, flags);
 
     if (ret)
         ret->mad_size = mad_size;
 
     return ret;
 }
 
 static size_t port_mad_size(const struct ib_mad_port_private *port_priv)
 {
     return rdma_max_mad_size(port_priv->device, port_priv->port_num);
 }
 
 static size_t mad_priv_dma_size(const struct ib_mad_private *mp)
 {
     return sizeof(struct ib_grh) + mp->mad_size;
 }
 
 /*
  * Return 0 if SMP is to be sent
  * Return 1 if SMP was consumed locally (whether or not solicited)
  * Return < 0 if error
  */
 static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
                   struct ib_mad_send_wr_private *mad_send_wr)
 {
     int ret = 0;
     struct ib_smp *smp = mad_send_wr->send_buf.mad;
     struct opa_smp *opa_smp = (struct opa_smp *)smp;
     unsigned long flags;
     struct ib_mad_local_private *local;
     struct ib_mad_private *mad_priv;
     struct ib_mad_port_private *port_priv;
     struct ib_mad_agent_private *recv_mad_agent = NULL;
     struct ib_device *device = mad_agent_priv->agent.device;
     u32 port_num;
     struct ib_wc mad_wc;
     struct ib_ud_wr *send_wr = &mad_send_wr->send_wr;
     size_t mad_size = port_mad_size(mad_agent_priv->qp_info->port_priv);
     u16 out_mad_pkey_index = 0;
     u16 drslid;
     bool opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
                     mad_agent_priv->qp_info->port_priv->port_num);
 
     if (rdma_cap_ib_switch(device) &&
         smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
         port_num = send_wr->port_num;
     else
         port_num = mad_agent_priv->agent.port_num;
 
     /*
      * Directed route handling starts if the initial LID routed part of
      * a request or the ending LID routed part of a response is empty.
      * If we are at the start of the LID routed part, don't update the
      * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
      */
     if (opa && smp->class_version == OPA_SM_CLASS_VERSION) {
         u32 opa_drslid;
 
         trace_ib_mad_handle_out_opa_smi(opa_smp);
 
         if ((opa_get_smp_direction(opa_smp)
              ? opa_smp->route.dr.dr_dlid : opa_smp->route.dr.dr_slid) ==
              OPA_LID_PERMISSIVE &&
              opa_smi_handle_dr_smp_send(opa_smp,
                         rdma_cap_ib_switch(device),
                         port_num) == IB_SMI_DISCARD) {
             ret = -EINVAL;
             dev_err(&device->dev, "OPA Invalid directed route\n");
             goto out;
         }
         opa_drslid = be32_to_cpu(opa_smp->route.dr.dr_slid);
         if (opa_drslid != be32_to_cpu(OPA_LID_PERMISSIVE) &&
             opa_drslid & 0xffff0000) {
             ret = -EINVAL;
             dev_err(&device->dev, "OPA Invalid dr_slid 0x%x\n",
                    opa_drslid);
             goto out;
         }
         drslid = (u16)(opa_drslid & 0x0000ffff);
 
         /* Check to post send on QP or process locally */
         if (opa_smi_check_local_smp(opa_smp, device) == IB_SMI_DISCARD &&
             opa_smi_check_local_returning_smp(opa_smp, device) == IB_SMI_DISCARD)
             goto out;
     } else {
         trace_ib_mad_handle_out_ib_smi(smp);
 
         if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
              IB_LID_PERMISSIVE &&
              smi_handle_dr_smp_send(smp, rdma_cap_ib_switch(device), port_num) ==
              IB_SMI_DISCARD) {
             ret = -EINVAL;
             dev_err(&device->dev, "Invalid directed route\n");
             goto out;
         }
         drslid = be16_to_cpu(smp->dr_slid);
 
         /* Check to post send on QP or process locally */
         if (smi_check_local_smp(smp, device) == IB_SMI_DISCARD &&
             smi_check_local_returning_smp(smp, device) == IB_SMI_DISCARD)
             goto out;
     }
 
     local = kmalloc(sizeof *local, GFP_ATOMIC);
     if (!local) {
         ret = -ENOMEM;
         goto out;
     }
     local->mad_priv = NULL;
     local->recv_mad_agent = NULL;
     mad_priv = alloc_mad_private(mad_size, GFP_ATOMIC);
     if (!mad_priv) {
         ret = -ENOMEM;
         kfree(local);
         goto out;
     }
 
     build_smp_wc(mad_agent_priv->agent.qp,
              send_wr->wr.wr_cqe, drslid,
              send_wr->pkey_index,
              send_wr->port_num, &mad_wc);
 
     if (opa && smp->base_version == OPA_MGMT_BASE_VERSION) {
         mad_wc.byte_len = mad_send_wr->send_buf.hdr_len
                     + mad_send_wr->send_buf.data_len
                     + sizeof(struct ib_grh);
     }
 
     /* No GRH for DR SMP */
     ret = device->ops.process_mad(device, 0, port_num, &mad_wc, NULL,
                       (const struct ib_mad *)smp,
                       (struct ib_mad *)mad_priv->mad, &mad_size,
                       &out_mad_pkey_index);
     switch (ret) {
     case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
         if (ib_response_mad((const struct ib_mad_hdr *)mad_priv->mad) &&
             mad_agent_priv->agent.recv_handler) {
             local->mad_priv = mad_priv;
             local->recv_mad_agent = mad_agent_priv;
             /*
              * Reference MAD agent until receive
              * side of local completion handled
              */
             refcount_inc(&mad_agent_priv->refcount);
         } else
             kfree(mad_priv);
         break;
     case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
         kfree(mad_priv);
         break;
     case IB_MAD_RESULT_SUCCESS:
         /* Treat like an incoming receive MAD */
         port_priv = ib_get_mad_port(mad_agent_priv->agent.device,
                         mad_agent_priv->agent.port_num);
         if (port_priv) {
             memcpy(mad_priv->mad, smp, mad_priv->mad_size);
             recv_mad_agent = find_mad_agent(port_priv,
                                 (const struct ib_mad_hdr *)mad_priv->mad);
         }
         if (!port_priv || !recv_mad_agent) {
             /*
              * No receiving agent so drop packet and
              * generate send completion.
              */
             kfree(mad_priv);
             break;
         }
         local->mad_priv = mad_priv;
         local->recv_mad_agent = recv_mad_agent;
         break;
     default:
         kfree(mad_priv);
         kfree(local);
         ret = -EINVAL;
         goto out;
     }
 
     local->mad_send_wr = mad_send_wr;
     if (opa) {
         local->mad_send_wr->send_wr.pkey_index = out_mad_pkey_index;
         local->return_wc_byte_len = mad_size;
     }
     /* Reference MAD agent until send side of local completion handled */
     refcount_inc(&mad_agent_priv->refcount);
     /* Queue local completion to local list */
     spin_lock_irqsave(&mad_agent_priv->lock, flags);
     list_add_tail(&local->completion_list, &mad_agent_priv->local_list);
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
     queue_work(mad_agent_priv->qp_info->port_priv->wq,
            &mad_agent_priv->local_work);
     ret = 1;
 out:
     return ret;
 }
 
 static int get_pad_size(int hdr_len, int data_len, size_t mad_size)
 {
     int seg_size, pad;
 
     seg_size = mad_size - hdr_len;
     if (data_len && seg_size) {
         pad = seg_size - data_len % seg_size;
         return pad == seg_size ? 0 : pad;
     } else
         return seg_size;
 }
 
 static void free_send_rmpp_list(struct ib_mad_send_wr_private *mad_send_wr)
 {
     struct ib_rmpp_segment *s, *t;
 
     list_for_each_entry_safe(s, t, &mad_send_wr->rmpp_list, list) {
         list_del(&s->list);
         kfree(s);
     }
 }
 
 static int alloc_send_rmpp_list(struct ib_mad_send_wr_private *send_wr,
                 size_t mad_size, gfp_t gfp_mask)
 {
     struct ib_mad_send_buf *send_buf = &send_wr->send_buf;
     struct ib_rmpp_mad *rmpp_mad = send_buf->mad;
     struct ib_rmpp_segment *seg = NULL;
     int left, seg_size, pad;
 
     send_buf->seg_size = mad_size - send_buf->hdr_len;
     send_buf->seg_rmpp_size = mad_size - IB_MGMT_RMPP_HDR;
     seg_size = send_buf->seg_size;
     pad = send_wr->pad;
 
     /* Allocate data segments. */
     for (left = send_buf->data_len + pad; left > 0; left -= seg_size) {
         seg = kmalloc(sizeof(*seg) + seg_size, gfp_mask);
         if (!seg) {
             free_send_rmpp_list(send_wr);
             return -ENOMEM;
         }
         seg->num = ++send_buf->seg_count;
         list_add_tail(&seg->list, &send_wr->rmpp_list);
     }
 
     /* Zero any padding */
     if (pad)
         memset(seg->data + seg_size - pad, 0, pad);
 
     rmpp_mad->rmpp_hdr.rmpp_version = send_wr->mad_agent_priv->
                       agent.rmpp_version;
     rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_DATA;
     ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 
     send_wr->cur_seg = container_of(send_wr->rmpp_list.next,
                     struct ib_rmpp_segment, list);
     send_wr->last_ack_seg = send_wr->cur_seg;
     return 0;
 }
 
 int ib_mad_kernel_rmpp_agent(const struct ib_mad_agent *agent)
 {
     return agent->rmpp_version && !(agent->flags & IB_MAD_USER_RMPP);
 }
 EXPORT_SYMBOL(ib_mad_kernel_rmpp_agent);
 
 struct ib_mad_send_buf *ib_create_send_mad(struct ib_mad_agent *mad_agent,
                        u32 remote_qpn, u16 pkey_index,
                        int rmpp_active, int hdr_len,
                        int data_len, gfp_t gfp_mask,
                        u8 base_version)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_send_wr_private *mad_send_wr;
     int pad, message_size, ret, size;
     void *buf;
     size_t mad_size;
     bool opa;
 
     mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
                       agent);
 
     opa = rdma_cap_opa_mad(mad_agent->device, mad_agent->port_num);
 
     if (opa && base_version == OPA_MGMT_BASE_VERSION)
         mad_size = sizeof(struct opa_mad);
     else
         mad_size = sizeof(struct ib_mad);
 
     pad = get_pad_size(hdr_len, data_len, mad_size);
     message_size = hdr_len + data_len + pad;
 
     if (ib_mad_kernel_rmpp_agent(mad_agent)) {
         if (!rmpp_active && message_size > mad_size)
             return ERR_PTR(-EINVAL);
     } else
         if (rmpp_active || message_size > mad_size)
             return ERR_PTR(-EINVAL);
 
     size = rmpp_active ? hdr_len : mad_size;
     buf = kzalloc(sizeof *mad_send_wr + size, gfp_mask);
     if (!buf)
         return ERR_PTR(-ENOMEM);
 
     mad_send_wr = buf + size;
     INIT_LIST_HEAD(&mad_send_wr->rmpp_list);
     mad_send_wr->send_buf.mad = buf;
     mad_send_wr->send_buf.hdr_len = hdr_len;
     mad_send_wr->send_buf.data_len = data_len;
     mad_send_wr->pad = pad;
 
     mad_send_wr->mad_agent_priv = mad_agent_priv;
     mad_send_wr->sg_list[0].length = hdr_len;
     mad_send_wr->sg_list[0].lkey = mad_agent->qp->pd->local_dma_lkey;
 
     /* OPA MADs don't have to be the full 2048 bytes */
     if (opa && base_version == OPA_MGMT_BASE_VERSION &&
         data_len < mad_size - hdr_len)
         mad_send_wr->sg_list[1].length = data_len;
     else
         mad_send_wr->sg_list[1].length = mad_size - hdr_len;
 
     mad_send_wr->sg_list[1].lkey = mad_agent->qp->pd->local_dma_lkey;
 
     mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
 
     mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
     mad_send_wr->send_wr.wr.sg_list = mad_send_wr->sg_list;
     mad_send_wr->send_wr.wr.num_sge = 2;
     mad_send_wr->send_wr.wr.opcode = IB_WR_SEND;
     mad_send_wr->send_wr.wr.send_flags = IB_SEND_SIGNALED;
     mad_send_wr->send_wr.remote_qpn = remote_qpn;
     mad_send_wr->send_wr.remote_qkey = IB_QP_SET_QKEY;
     mad_send_wr->send_wr.pkey_index = pkey_index;
 
     if (rmpp_active) {
         ret = alloc_send_rmpp_list(mad_send_wr, mad_size, gfp_mask);
         if (ret) {
             kfree(buf);
             return ERR_PTR(ret);
         }
     }
 
     mad_send_wr->send_buf.mad_agent = mad_agent;
     refcount_inc(&mad_agent_priv->refcount);
     return &mad_send_wr->send_buf;
 }
 EXPORT_SYMBOL(ib_create_send_mad);
 
 int ib_get_mad_data_offset(u8 mgmt_class)
 {
     if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
         return IB_MGMT_SA_HDR;
     else if ((mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
          (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
          (mgmt_class == IB_MGMT_CLASS_BIS))
         return IB_MGMT_DEVICE_HDR;
     else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
          (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
         return IB_MGMT_VENDOR_HDR;
     else
         return IB_MGMT_MAD_HDR;
 }
 EXPORT_SYMBOL(ib_get_mad_data_offset);
 
 int ib_is_mad_class_rmpp(u8 mgmt_class)
 {
     if ((mgmt_class == IB_MGMT_CLASS_SUBN_ADM) ||
         (mgmt_class == IB_MGMT_CLASS_DEVICE_MGMT) ||
         (mgmt_class == IB_MGMT_CLASS_DEVICE_ADM) ||
         (mgmt_class == IB_MGMT_CLASS_BIS) ||
         ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
          (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)))
         return 1;
     return 0;
 }
 EXPORT_SYMBOL(ib_is_mad_class_rmpp);
 
 void *ib_get_rmpp_segment(struct ib_mad_send_buf *send_buf, int seg_num)
 {
     struct ib_mad_send_wr_private *mad_send_wr;
     struct list_head *list;
 
     mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
                    send_buf);
     list = &mad_send_wr->cur_seg->list;
 
     if (mad_send_wr->cur_seg->num < seg_num) {
         list_for_each_entry(mad_send_wr->cur_seg, list, list)
             if (mad_send_wr->cur_seg->num == seg_num)
                 break;
     } else if (mad_send_wr->cur_seg->num > seg_num) {
         list_for_each_entry_reverse(mad_send_wr->cur_seg, list, list)
             if (mad_send_wr->cur_seg->num == seg_num)
                 break;
     }
     return mad_send_wr->cur_seg->data;
 }
 EXPORT_SYMBOL(ib_get_rmpp_segment);
 
 static inline void *ib_get_payload(struct ib_mad_send_wr_private *mad_send_wr)
 {
     if (mad_send_wr->send_buf.seg_count)
         return ib_get_rmpp_segment(&mad_send_wr->send_buf,
                        mad_send_wr->seg_num);
     else
         return mad_send_wr->send_buf.mad +
                mad_send_wr->send_buf.hdr_len;
 }
 
 void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_send_wr_private *mad_send_wr;
 
     mad_agent_priv = container_of(send_buf->mad_agent,
                       struct ib_mad_agent_private, agent);
     mad_send_wr = container_of(send_buf, struct ib_mad_send_wr_private,
                    send_buf);
 
     free_send_rmpp_list(mad_send_wr);
     kfree(send_buf->mad);
     deref_mad_agent(mad_agent_priv);
 }
 EXPORT_SYMBOL(ib_free_send_mad);
 
 int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr)
 {
     struct ib_mad_qp_info *qp_info;
     struct list_head *list;
     struct ib_mad_agent *mad_agent;
     struct ib_sge *sge;
     unsigned long flags;
     int ret;
 
     /* Set WR ID to find mad_send_wr upon completion */
     qp_info = mad_send_wr->mad_agent_priv->qp_info;
     mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;
     mad_send_wr->mad_list.cqe.done = ib_mad_send_done;
     mad_send_wr->send_wr.wr.wr_cqe = &mad_send_wr->mad_list.cqe;
 
     mad_agent = mad_send_wr->send_buf.mad_agent;
     sge = mad_send_wr->sg_list;
     sge[0].addr = ib_dma_map_single(mad_agent->device,
                     mad_send_wr->send_buf.mad,
                     sge[0].length,
                     DMA_TO_DEVICE);
     if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr)))
         return -ENOMEM;
 
     mad_send_wr->header_mapping = sge[0].addr;
 
     sge[1].addr = ib_dma_map_single(mad_agent->device,
                     ib_get_payload(mad_send_wr),
                     sge[1].length,
                     DMA_TO_DEVICE);
     if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) {
         ib_dma_unmap_single(mad_agent->device,
                     mad_send_wr->header_mapping,
                     sge[0].length, DMA_TO_DEVICE);
         return -ENOMEM;
     }
     mad_send_wr->payload_mapping = sge[1].addr;
 
     spin_lock_irqsave(&qp_info->send_queue.lock, flags);
     if (qp_info->send_queue.count < qp_info->send_queue.max_active) {
         trace_ib_mad_ib_send_mad(mad_send_wr, qp_info);
         ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr.wr,
                    NULL);
         list = &qp_info->send_queue.list;
     } else {
         ret = 0;
         list = &qp_info->overflow_list;
     }
 
     if (!ret) {
         qp_info->send_queue.count++;
         list_add_tail(&mad_send_wr->mad_list.list, list);
     }
     spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
     if (ret) {
         ib_dma_unmap_single(mad_agent->device,
                     mad_send_wr->header_mapping,
                     sge[0].length, DMA_TO_DEVICE);
         ib_dma_unmap_single(mad_agent->device,
                     mad_send_wr->payload_mapping,
                     sge[1].length, DMA_TO_DEVICE);
     }
     return ret;
 }
 
 /*
  * ib_post_send_mad - Posts MAD(s) to the send queue of the QP associated
  *  with the registered client
  */
 int ib_post_send_mad(struct ib_mad_send_buf *send_buf,
              struct ib_mad_send_buf **bad_send_buf)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_send_buf *next_send_buf;
     struct ib_mad_send_wr_private *mad_send_wr;
     unsigned long flags;
     int ret = -EINVAL;
 
     /* Walk list of send WRs and post each on send list */
     for (; send_buf; send_buf = next_send_buf) {
         mad_send_wr = container_of(send_buf,
                        struct ib_mad_send_wr_private,
                        send_buf);
         mad_agent_priv = mad_send_wr->mad_agent_priv;
 
         ret = ib_mad_enforce_security(mad_agent_priv,
                           mad_send_wr->send_wr.pkey_index);
         if (ret)
             goto error;
 
         if (!send_buf->mad_agent->send_handler ||
             (send_buf->timeout_ms &&
              !send_buf->mad_agent->recv_handler)) {
             ret = -EINVAL;
             goto error;
         }
 
         if (!ib_is_mad_class_rmpp(((struct ib_mad_hdr *) send_buf->mad)->mgmt_class)) {
             if (mad_agent_priv->agent.rmpp_version) {
                 ret = -EINVAL;
                 goto error;
             }
         }
 
         /*
          * Save pointer to next work request to post in case the
          * current one completes, and the user modifies the work
          * request associated with the completion
          */
         next_send_buf = send_buf->next;
         mad_send_wr->send_wr.ah = send_buf->ah;
 
         if (((struct ib_mad_hdr *) send_buf->mad)->mgmt_class ==
             IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
             ret = handle_outgoing_dr_smp(mad_agent_priv,
                              mad_send_wr);
             if (ret < 0)        /* error */
                 goto error;
             else if (ret == 1)  /* locally consumed */
                 continue;
         }
 
         mad_send_wr->tid = ((struct ib_mad_hdr *) send_buf->mad)->tid;
         /* Timeout will be updated after send completes */
         mad_send_wr->timeout = msecs_to_jiffies(send_buf->timeout_ms);
         mad_send_wr->max_retries = send_buf->retries;
         mad_send_wr->retries_left = send_buf->retries;
         send_buf->retries = 0;
         /* Reference for work request to QP + response */
         mad_send_wr->refcount = 1 + (mad_send_wr->timeout > 0);
         mad_send_wr->status = IB_WC_SUCCESS;
 
         /* Reference MAD agent until send completes */
         refcount_inc(&mad_agent_priv->refcount);
         spin_lock_irqsave(&mad_agent_priv->lock, flags);
         list_add_tail(&mad_send_wr->agent_list,
                   &mad_agent_priv->send_list);
         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 
         if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
             ret = ib_send_rmpp_mad(mad_send_wr);
             if (ret >= 0 && ret != IB_RMPP_RESULT_CONSUMED)
                 ret = ib_send_mad(mad_send_wr);
         } else
             ret = ib_send_mad(mad_send_wr);
         if (ret < 0) {
             /* Fail send request */
             spin_lock_irqsave(&mad_agent_priv->lock, flags);
             list_del(&mad_send_wr->agent_list);
             spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
             deref_mad_agent(mad_agent_priv);
             goto error;
         }
     }
     return 0;
 error:
     if (bad_send_buf)
         *bad_send_buf = send_buf;
     return ret;
 }
 EXPORT_SYMBOL(ib_post_send_mad);
 
 /*
  * ib_free_recv_mad - Returns data buffers used to receive
  *  a MAD to the access layer
  */
 void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc)
 {
     struct ib_mad_recv_buf *mad_recv_buf, *temp_recv_buf;
     struct ib_mad_private_header *mad_priv_hdr;
     struct ib_mad_private *priv;
     struct list_head free_list;
 
     INIT_LIST_HEAD(&free_list);
     list_splice_init(&mad_recv_wc->rmpp_list, &free_list);
 
     list_for_each_entry_safe(mad_recv_buf, temp_recv_buf,
                     &free_list, list) {
         mad_recv_wc = container_of(mad_recv_buf, struct ib_mad_recv_wc,
                        recv_buf);
         mad_priv_hdr = container_of(mad_recv_wc,
                         struct ib_mad_private_header,
                         recv_wc);
         priv = container_of(mad_priv_hdr, struct ib_mad_private,
                     header);
         kfree(priv);
     }
 }
 EXPORT_SYMBOL(ib_free_recv_mad);
 
 static int method_in_use(struct ib_mad_mgmt_method_table **method,
              struct ib_mad_reg_req *mad_reg_req)
 {
     int i;
 
     for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS) {
         if ((*method)->agent[i]) {
             pr_err("Method %d already in use\n", i);
             return -EINVAL;
         }
     }
     return 0;
 }
 
 static int allocate_method_table(struct ib_mad_mgmt_method_table **method)
 {
     /* Allocate management method table */
     *method = kzalloc(sizeof **method, GFP_ATOMIC);
     return (*method) ? 0 : (-ENOMEM);
 }
 
 /*
  * Check to see if there are any methods still in use
  */
 static int check_method_table(struct ib_mad_mgmt_method_table *method)
 {
     int i;
 
     for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
         if (method->agent[i])
             return 1;
     return 0;
 }
 
 /*
  * Check to see if there are any method tables for this class still in use
  */
 static int check_class_table(struct ib_mad_mgmt_class_table *class)
 {
     int i;
 
     for (i = 0; i < MAX_MGMT_CLASS; i++)
         if (class->method_table[i])
             return 1;
     return 0;
 }
 
 static int check_vendor_class(struct ib_mad_mgmt_vendor_class *vendor_class)
 {
     int i;
 
     for (i = 0; i < MAX_MGMT_OUI; i++)
         if (vendor_class->method_table[i])
             return 1;
     return 0;
 }
 
 static int find_vendor_oui(struct ib_mad_mgmt_vendor_class *vendor_class,
                const char *oui)
 {
     int i;
 
     for (i = 0; i < MAX_MGMT_OUI; i++)
         /* Is there matching OUI for this vendor class ? */
         if (!memcmp(vendor_class->oui[i], oui, 3))
             return i;
 
     return -1;
 }
 
 static int check_vendor_table(struct ib_mad_mgmt_vendor_class_table *vendor)
 {
     int i;
 
     for (i = 0; i < MAX_MGMT_VENDOR_RANGE2; i++)
         if (vendor->vendor_class[i])
             return 1;
 
     return 0;
 }
 
 static void remove_methods_mad_agent(struct ib_mad_mgmt_method_table *method,
                      struct ib_mad_agent_private *agent)
 {
     int i;
 
     /* Remove any methods for this mad agent */
     for (i = 0; i < IB_MGMT_MAX_METHODS; i++)
         if (method->agent[i] == agent)
             method->agent[i] = NULL;
 }
 
 static int add_nonoui_reg_req(struct ib_mad_reg_req *mad_reg_req,
                   struct ib_mad_agent_private *agent_priv,
                   u8 mgmt_class)
 {
     struct ib_mad_port_private *port_priv;
     struct ib_mad_mgmt_class_table **class;
     struct ib_mad_mgmt_method_table **method;
     int i, ret;
 
     port_priv = agent_priv->qp_info->port_priv;
     class = &port_priv->version[mad_reg_req->mgmt_class_version].class;
     if (!*class) {
         /* Allocate management class table for "new" class version */
         *class = kzalloc(sizeof **class, GFP_ATOMIC);
         if (!*class) {
             ret = -ENOMEM;
             goto error1;
         }
 
         /* Allocate method table for this management class */
         method = &(*class)->method_table[mgmt_class];
         if ((ret = allocate_method_table(method)))
             goto error2;
     } else {
         method = &(*class)->method_table[mgmt_class];
         if (!*method) {
             /* Allocate method table for this management class */
             if ((ret = allocate_method_table(method)))
                 goto error1;
         }
     }
 
     /* Now, make sure methods are not already in use */
     if (method_in_use(method, mad_reg_req))
         goto error3;
 
     /* Finally, add in methods being registered */
     for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
         (*method)->agent[i] = agent_priv;
 
     return 0;
 
 error3:
     /* Remove any methods for this mad agent */
     remove_methods_mad_agent(*method, agent_priv);
     /* Now, check to see if there are any methods in use */
     if (!check_method_table(*method)) {
         /* If not, release management method table */
         kfree(*method);
         *method = NULL;
     }
     ret = -EINVAL;
     goto error1;
 error2:
     kfree(*class);
     *class = NULL;
 error1:
     return ret;
 }
 
 static int add_oui_reg_req(struct ib_mad_reg_req *mad_reg_req,
                struct ib_mad_agent_private *agent_priv)
 {
     struct ib_mad_port_private *port_priv;
     struct ib_mad_mgmt_vendor_class_table **vendor_table;
     struct ib_mad_mgmt_vendor_class_table *vendor = NULL;
     struct ib_mad_mgmt_vendor_class *vendor_class = NULL;
     struct ib_mad_mgmt_method_table **method;
     int i, ret = -ENOMEM;
     u8 vclass;
 
     /* "New" vendor (with OUI) class */
     vclass = vendor_class_index(mad_reg_req->mgmt_class);
     port_priv = agent_priv->qp_info->port_priv;
     vendor_table = &port_priv->version[
                 mad_reg_req->mgmt_class_version].vendor;
     if (!*vendor_table) {
         /* Allocate mgmt vendor class table for "new" class version */
         vendor = kzalloc(sizeof *vendor, GFP_ATOMIC);
         if (!vendor)
             goto error1;
 
         *vendor_table = vendor;
     }
     if (!(*vendor_table)->vendor_class[vclass]) {
         /* Allocate table for this management vendor class */
         vendor_class = kzalloc(sizeof *vendor_class, GFP_ATOMIC);
         if (!vendor_class)
             goto error2;
 
         (*vendor_table)->vendor_class[vclass] = vendor_class;
     }
     for (i = 0; i < MAX_MGMT_OUI; i++) {
         /* Is there matching OUI for this vendor class ? */
         if (!memcmp((*vendor_table)->vendor_class[vclass]->oui[i],
                 mad_reg_req->oui, 3)) {
             method = &(*vendor_table)->vendor_class[
                         vclass]->method_table[i];
             if (!*method)
                 goto error3;
             goto check_in_use;
         }
     }
     for (i = 0; i < MAX_MGMT_OUI; i++) {
         /* OUI slot available ? */
         if (!is_vendor_oui((*vendor_table)->vendor_class[
                 vclass]->oui[i])) {
             method = &(*vendor_table)->vendor_class[
                 vclass]->method_table[i];
             /* Allocate method table for this OUI */
             if (!*method) {
                 ret = allocate_method_table(method);
                 if (ret)
                     goto error3;
             }
             memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
                    mad_reg_req->oui, 3);
             goto check_in_use;
         }
     }
     dev_err(&agent_priv->agent.device->dev, "All OUI slots in use\n");
     goto error3;
 
 check_in_use:
     /* Now, make sure methods are not already in use */
     if (method_in_use(method, mad_reg_req))
         goto error4;
 
     /* Finally, add in methods being registered */
     for_each_set_bit(i, mad_reg_req->method_mask, IB_MGMT_MAX_METHODS)
         (*method)->agent[i] = agent_priv;
 
     return 0;
 
 error4:
     /* Remove any methods for this mad agent */
     remove_methods_mad_agent(*method, agent_priv);
     /* Now, check to see if there are any methods in use */
     if (!check_method_table(*method)) {
         /* If not, release management method table */
         kfree(*method);
         *method = NULL;
     }
     ret = -EINVAL;
 error3:
     if (vendor_class) {
         (*vendor_table)->vendor_class[vclass] = NULL;
         kfree(vendor_class);
     }
 error2:
     if (vendor) {
         *vendor_table = NULL;
         kfree(vendor);
     }
 error1:
     return ret;
 }
 
 static void remove_mad_reg_req(struct ib_mad_agent_private *agent_priv)
 {
     struct ib_mad_port_private *port_priv;
     struct ib_mad_mgmt_class_table *class;
     struct ib_mad_mgmt_method_table *method;
     struct ib_mad_mgmt_vendor_class_table *vendor;
     struct ib_mad_mgmt_vendor_class *vendor_class;
     int index;
     u8 mgmt_class;
 
     /*
      * Was MAD registration request supplied
      * with original registration ?
      */
     if (!agent_priv->reg_req)
         goto out;
 
     port_priv = agent_priv->qp_info->port_priv;
     mgmt_class = convert_mgmt_class(agent_priv->reg_req->mgmt_class);
     class = port_priv->version[
             agent_priv->reg_req->mgmt_class_version].class;
     if (!class)
         goto vendor_check;
 
     method = class->method_table[mgmt_class];
     if (method) {
         /* Remove any methods for this mad agent */
         remove_methods_mad_agent(method, agent_priv);
         /* Now, check to see if there are any methods still in use */
         if (!check_method_table(method)) {
             /* If not, release management method table */
             kfree(method);
             class->method_table[mgmt_class] = NULL;
             /* Any management classes left ? */
             if (!check_class_table(class)) {
                 /* If not, release management class table */
                 kfree(class);
                 port_priv->version[
                     agent_priv->reg_req->
                     mgmt_class_version].class = NULL;
             }
         }
     }
 
 vendor_check:
     if (!is_vendor_class(mgmt_class))
         goto out;
 
     /* normalize mgmt_class to vendor range 2 */
     mgmt_class = vendor_class_index(agent_priv->reg_req->mgmt_class);
     vendor = port_priv->version[
             agent_priv->reg_req->mgmt_class_version].vendor;
 
     if (!vendor)
         goto out;
 
     vendor_class = vendor->vendor_class[mgmt_class];
     if (vendor_class) {
         index = find_vendor_oui(vendor_class, agent_priv->reg_req->oui);
         if (index < 0)
             goto out;
         method = vendor_class->method_table[index];
         if (method) {
             /* Remove any methods for this mad agent */
             remove_methods_mad_agent(method, agent_priv);
             /*
              * Now, check to see if there are
              * any methods still in use
              */
             if (!check_method_table(method)) {
                 /* If not, release management method table */
                 kfree(method);
                 vendor_class->method_table[index] = NULL;
                 memset(vendor_class->oui[index], 0, 3);
                 /* Any OUIs left ? */
                 if (!check_vendor_class(vendor_class)) {
                     /* If not, release vendor class table */
                     kfree(vendor_class);
                     vendor->vendor_class[mgmt_class] = NULL;
                     /* Any other vendor classes left ? */
                     if (!check_vendor_table(vendor)) {
                         kfree(vendor);
                         port_priv->version[
                             agent_priv->reg_req->
                             mgmt_class_version].
                             vendor = NULL;
                     }
                 }
             }
         }
     }
 
 out:
     return;
 }
 
 static struct ib_mad_agent_private *
 find_mad_agent(struct ib_mad_port_private *port_priv,
            const struct ib_mad_hdr *mad_hdr)
 {
     struct ib_mad_agent_private *mad_agent = NULL;
     unsigned long flags;
 
     if (ib_response_mad(mad_hdr)) {
         u32 hi_tid;
 
         /*
          * Routing is based on high 32 bits of transaction ID
          * of MAD.
          */
         hi_tid = be64_to_cpu(mad_hdr->tid) >> 32;
         rcu_read_lock();
         mad_agent = xa_load(&ib_mad_clients, hi_tid);
         if (mad_agent && !refcount_inc_not_zero(&mad_agent->refcount))
             mad_agent = NULL;
         rcu_read_unlock();
     } else {
         struct ib_mad_mgmt_class_table *class;
         struct ib_mad_mgmt_method_table *method;
         struct ib_mad_mgmt_vendor_class_table *vendor;
         struct ib_mad_mgmt_vendor_class *vendor_class;
         const struct ib_vendor_mad *vendor_mad;
         int index;
 
         spin_lock_irqsave(&port_priv->reg_lock, flags);
         /*
          * Routing is based on version, class, and method
          * For "newer" vendor MADs, also based on OUI
          */
         if (mad_hdr->class_version >= MAX_MGMT_VERSION)
             goto out;
         if (!is_vendor_class(mad_hdr->mgmt_class)) {
             class = port_priv->version[
                     mad_hdr->class_version].class;
             if (!class)
                 goto out;
             if (convert_mgmt_class(mad_hdr->mgmt_class) >=
                 ARRAY_SIZE(class->method_table))
                 goto out;
             method = class->method_table[convert_mgmt_class(
                             mad_hdr->mgmt_class)];
             if (method)
                 mad_agent = method->agent[mad_hdr->method &
                               ~IB_MGMT_METHOD_RESP];
         } else {
             vendor = port_priv->version[
                     mad_hdr->class_version].vendor;
             if (!vendor)
                 goto out;
             vendor_class = vendor->vendor_class[vendor_class_index(
                         mad_hdr->mgmt_class)];
             if (!vendor_class)
                 goto out;
             /* Find matching OUI */
             vendor_mad = (const struct ib_vendor_mad *)mad_hdr;
             index = find_vendor_oui(vendor_class, vendor_mad->oui);
             if (index == -1)
                 goto out;
             method = vendor_class->method_table[index];
             if (method) {
                 mad_agent = method->agent[mad_hdr->method &
                               ~IB_MGMT_METHOD_RESP];
             }
         }
         if (mad_agent)
             refcount_inc(&mad_agent->refcount);
 out:
         spin_unlock_irqrestore(&port_priv->reg_lock, flags);
     }
 
     if (mad_agent && !mad_agent->agent.recv_handler) {
         dev_notice(&port_priv->device->dev,
                "No receive handler for client %p on port %u\n",
                &mad_agent->agent, port_priv->port_num);
         deref_mad_agent(mad_agent);
         mad_agent = NULL;
     }
 
     return mad_agent;
 }
 
 static int validate_mad(const struct ib_mad_hdr *mad_hdr,
             const struct ib_mad_qp_info *qp_info,
             bool opa)
 {
     int valid = 0;
     u32 qp_num = qp_info->qp->qp_num;
 
     /* Make sure MAD base version is understood */
     if (mad_hdr->base_version != IB_MGMT_BASE_VERSION &&
         (!opa || mad_hdr->base_version != OPA_MGMT_BASE_VERSION)) {
         pr_err("MAD received with unsupported base version %u %s\n",
                mad_hdr->base_version, opa ? "(opa)" : "");
         goto out;
     }
 
     /* Filter SMI packets sent to other than QP0 */
     if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
         (mad_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
         if (qp_num == 0)
             valid = 1;
     } else {
         /* CM attributes other than ClassPortInfo only use Send method */
         if ((mad_hdr->mgmt_class == IB_MGMT_CLASS_CM) &&
             (mad_hdr->attr_id != IB_MGMT_CLASSPORTINFO_ATTR_ID) &&
             (mad_hdr->method != IB_MGMT_METHOD_SEND))
             goto out;
         /* Filter GSI packets sent to QP0 */
         if (qp_num != 0)
             valid = 1;
     }
 
 out:
     return valid;
 }
 
 static int is_rmpp_data_mad(const struct ib_mad_agent_private *mad_agent_priv,
                 const struct ib_mad_hdr *mad_hdr)
 {
     struct ib_rmpp_mad *rmpp_mad;
 
     rmpp_mad = (struct ib_rmpp_mad *)mad_hdr;
     return !mad_agent_priv->agent.rmpp_version ||
         !ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent) ||
         !(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
                     IB_MGMT_RMPP_FLAG_ACTIVE) ||
         (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_DATA);
 }
 
 static inline int rcv_has_same_class(const struct ib_mad_send_wr_private *wr,
                      const struct ib_mad_recv_wc *rwc)
 {
     return ((struct ib_mad_hdr *)(wr->send_buf.mad))->mgmt_class ==
         rwc->recv_buf.mad->mad_hdr.mgmt_class;
 }
 
 static inline int
 rcv_has_same_gid(const struct ib_mad_agent_private *mad_agent_priv,
          const struct ib_mad_send_wr_private *wr,
          const struct ib_mad_recv_wc *rwc)
 {
     struct rdma_ah_attr attr;
     u8 send_resp, rcv_resp;
     union ib_gid sgid;
     struct ib_device *device = mad_agent_priv->agent.device;
     u32 port_num = mad_agent_priv->agent.port_num;
     u8 lmc;
     bool has_grh;
 
     send_resp = ib_response_mad((struct ib_mad_hdr *)wr->send_buf.mad);
     rcv_resp = ib_response_mad(&rwc->recv_buf.mad->mad_hdr);
 
     if (send_resp == rcv_resp)
         /* both requests, or both responses. GIDs different */
         return 0;
 
     if (rdma_query_ah(wr->send_buf.ah, &attr))
         /* Assume not equal, to avoid false positives. */
         return 0;
 
     has_grh = !!(rdma_ah_get_ah_flags(&attr) & IB_AH_GRH);
     if (has_grh != !!(rwc->wc->wc_flags & IB_WC_GRH))
         /* one has GID, other does not.  Assume different */
         return 0;
 
     if (!send_resp && rcv_resp) {
         /* is request/response. */
         if (!has_grh) {
             if (ib_get_cached_lmc(device, port_num, &lmc))
                 return 0;
             return (!lmc || !((rdma_ah_get_path_bits(&attr) ^
                        rwc->wc->dlid_path_bits) &
                       ((1 << lmc) - 1)));
         } else {
             const struct ib_global_route *grh =
                     rdma_ah_read_grh(&attr);
 
             if (rdma_query_gid(device, port_num,
                        grh->sgid_index, &sgid))
                 return 0;
             return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
                        16);
         }
     }
 
     if (!has_grh)
         return rdma_ah_get_dlid(&attr) == rwc->wc->slid;
     else
         return !memcmp(rdma_ah_read_grh(&attr)->dgid.raw,
                    rwc->recv_buf.grh->sgid.raw,
                    16);
 }
 
 static inline int is_direct(u8 class)
 {
     return (class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE);
 }
 
 struct ib_mad_send_wr_private*
 ib_find_send_mad(const struct ib_mad_agent_private *mad_agent_priv,
          const struct ib_mad_recv_wc *wc)
 {
     struct ib_mad_send_wr_private *wr;
     const struct ib_mad_hdr *mad_hdr;
 
     mad_hdr = &wc->recv_buf.mad->mad_hdr;
 
     list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
         if ((wr->tid == mad_hdr->tid) &&
             rcv_has_same_class(wr, wc) &&
             /*
              * Don't check GID for direct routed MADs.
              * These might have permissive LIDs.
              */
             (is_direct(mad_hdr->mgmt_class) ||
              rcv_has_same_gid(mad_agent_priv, wr, wc)))
             return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
     }
 
     /*
      * It's possible to receive the response before we've
      * been notified that the send has completed
      */
     list_for_each_entry(wr, &mad_agent_priv->send_list, agent_list) {
         if (is_rmpp_data_mad(mad_agent_priv, wr->send_buf.mad) &&
             wr->tid == mad_hdr->tid &&
             wr->timeout &&
             rcv_has_same_class(wr, wc) &&
             /*
              * Don't check GID for direct routed MADs.
              * These might have permissive LIDs.
              */
             (is_direct(mad_hdr->mgmt_class) ||
              rcv_has_same_gid(mad_agent_priv, wr, wc)))
             /* Verify request has not been canceled */
             return (wr->status == IB_WC_SUCCESS) ? wr : NULL;
     }
     return NULL;
 }
 
 void ib_mark_mad_done(struct ib_mad_send_wr_private *mad_send_wr)
 {
     mad_send_wr->timeout = 0;
     if (mad_send_wr->refcount == 1)
         list_move_tail(&mad_send_wr->agent_list,
                   &mad_send_wr->mad_agent_priv->done_list);
 }
 
 static void ib_mad_complete_recv(struct ib_mad_agent_private *mad_agent_priv,
                  struct ib_mad_recv_wc *mad_recv_wc)
 {
     struct ib_mad_send_wr_private *mad_send_wr;
     struct ib_mad_send_wc mad_send_wc;
     unsigned long flags;
     int ret;
 
     INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
     ret = ib_mad_enforce_security(mad_agent_priv,
                       mad_recv_wc->wc->pkey_index);
     if (ret) {
         ib_free_recv_mad(mad_recv_wc);
         deref_mad_agent(mad_agent_priv);
         return;
     }
 
     list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
     if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
         mad_recv_wc = ib_process_rmpp_recv_wc(mad_agent_priv,
                               mad_recv_wc);
         if (!mad_recv_wc) {
             deref_mad_agent(mad_agent_priv);
             return;
         }
     }
 
     /* Complete corresponding request */
     if (ib_response_mad(&mad_recv_wc->recv_buf.mad->mad_hdr)) {
         spin_lock_irqsave(&mad_agent_priv->lock, flags);
         mad_send_wr = ib_find_send_mad(mad_agent_priv, mad_recv_wc);
         if (!mad_send_wr) {
             spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
             if (!ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)
                && ib_is_mad_class_rmpp(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class)
                && (ib_get_rmpp_flags(&((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr)
                     & IB_MGMT_RMPP_FLAG_ACTIVE)) {
                 /* user rmpp is in effect
                  * and this is an active RMPP MAD
                  */
                 mad_agent_priv->agent.recv_handler(
                         &mad_agent_priv->agent, NULL,
                         mad_recv_wc);
                 deref_mad_agent(mad_agent_priv);
             } else {
                 /* not user rmpp, revert to normal behavior and
                  * drop the mad
                  */
                 ib_free_recv_mad(mad_recv_wc);
                 deref_mad_agent(mad_agent_priv);
                 return;
             }
         } else {
             ib_mark_mad_done(mad_send_wr);
             spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 
             /* Defined behavior is to complete response before request */
             mad_agent_priv->agent.recv_handler(
                     &mad_agent_priv->agent,
                     &mad_send_wr->send_buf,
                     mad_recv_wc);
             deref_mad_agent(mad_agent_priv);
 
             mad_send_wc.status = IB_WC_SUCCESS;
             mad_send_wc.vendor_err = 0;
             mad_send_wc.send_buf = &mad_send_wr->send_buf;
             ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
         }
     } else {
         mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent, NULL,
                            mad_recv_wc);
         deref_mad_agent(mad_agent_priv);
     }
 }
 
 static enum smi_action handle_ib_smi(const struct ib_mad_port_private *port_priv,
                      const struct ib_mad_qp_info *qp_info,
                      const struct ib_wc *wc,
                      u32 port_num,
                      struct ib_mad_private *recv,
                      struct ib_mad_private *response)
 {
     enum smi_forward_action retsmi;
     struct ib_smp *smp = (struct ib_smp *)recv->mad;
 
     trace_ib_mad_handle_ib_smi(smp);
 
     if (smi_handle_dr_smp_recv(smp,
                    rdma_cap_ib_switch(port_priv->device),
                    port_num,
                    port_priv->device->phys_port_cnt) ==
                    IB_SMI_DISCARD)
         return IB_SMI_DISCARD;
 
     retsmi = smi_check_forward_dr_smp(smp);
     if (retsmi == IB_SMI_LOCAL)
         return IB_SMI_HANDLE;
 
     if (retsmi == IB_SMI_SEND) { /* don't forward */
         if (smi_handle_dr_smp_send(smp,
                        rdma_cap_ib_switch(port_priv->device),
                        port_num) == IB_SMI_DISCARD)
             return IB_SMI_DISCARD;
 
         if (smi_check_local_smp(smp, port_priv->device) == IB_SMI_DISCARD)
             return IB_SMI_DISCARD;
     } else if (rdma_cap_ib_switch(port_priv->device)) {
         /* forward case for switches */
         memcpy(response, recv, mad_priv_size(response));
         response->header.recv_wc.wc = &response->header.wc;
         response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
         response->header.recv_wc.recv_buf.grh = &response->grh;
 
         agent_send_response((const struct ib_mad_hdr *)response->mad,
                     &response->grh, wc,
                     port_priv->device,
                     smi_get_fwd_port(smp),
                     qp_info->qp->qp_num,
                     response->mad_size,
                     false);
 
         return IB_SMI_DISCARD;
     }
     return IB_SMI_HANDLE;
 }
 
 static bool generate_unmatched_resp(const struct ib_mad_private *recv,
                     struct ib_mad_private *response,
                     size_t *resp_len, bool opa)
 {
     const struct ib_mad_hdr *recv_hdr = (const struct ib_mad_hdr *)recv->mad;
     struct ib_mad_hdr *resp_hdr = (struct ib_mad_hdr *)response->mad;
 
     if (recv_hdr->method == IB_MGMT_METHOD_GET ||
         recv_hdr->method == IB_MGMT_METHOD_SET) {
         memcpy(response, recv, mad_priv_size(response));
         response->header.recv_wc.wc = &response->header.wc;
         response->header.recv_wc.recv_buf.mad = (struct ib_mad *)response->mad;
         response->header.recv_wc.recv_buf.grh = &response->grh;
         resp_hdr->method = IB_MGMT_METHOD_GET_RESP;
         resp_hdr->status = cpu_to_be16(IB_MGMT_MAD_STATUS_UNSUPPORTED_METHOD_ATTRIB);
         if (recv_hdr->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
             resp_hdr->status |= IB_SMP_DIRECTION;
 
         if (opa && recv_hdr->base_version == OPA_MGMT_BASE_VERSION) {
             if (recv_hdr->mgmt_class ==
                 IB_MGMT_CLASS_SUBN_LID_ROUTED ||
                 recv_hdr->mgmt_class ==
                 IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
                 *resp_len = opa_get_smp_header_size(
                             (struct opa_smp *)recv->mad);
             else
                 *resp_len = sizeof(struct ib_mad_hdr);
         }
 
         return true;
     } else {
         return false;
     }
 }
 
 static enum smi_action
 handle_opa_smi(struct ib_mad_port_private *port_priv,
            struct ib_mad_qp_info *qp_info,
            struct ib_wc *wc,
            u32 port_num,
            struct ib_mad_private *recv,
            struct ib_mad_private *response)
 {
     enum smi_forward_action retsmi;
     struct opa_smp *smp = (struct opa_smp *)recv->mad;
 
     trace_ib_mad_handle_opa_smi(smp);
 
     if (opa_smi_handle_dr_smp_recv(smp,
                    rdma_cap_ib_switch(port_priv->device),
                    port_num,
                    port_priv->device->phys_port_cnt) ==
                    IB_SMI_DISCARD)
         return IB_SMI_DISCARD;
 
     retsmi = opa_smi_check_forward_dr_smp(smp);
     if (retsmi == IB_SMI_LOCAL)
         return IB_SMI_HANDLE;
 
     if (retsmi == IB_SMI_SEND) { /* don't forward */
         if (opa_smi_handle_dr_smp_send(smp,
                        rdma_cap_ib_switch(port_priv->device),
                        port_num) == IB_SMI_DISCARD)
             return IB_SMI_DISCARD;
 
         if (opa_smi_check_local_smp(smp, port_priv->device) ==
             IB_SMI_DISCARD)
             return IB_SMI_DISCARD;
 
     } else if (rdma_cap_ib_switch(port_priv->device)) {
         /* forward case for switches */
         memcpy(response, recv, mad_priv_size(response));
         response->header.recv_wc.wc = &response->header.wc;
         response->header.recv_wc.recv_buf.opa_mad =
                 (struct opa_mad *)response->mad;
         response->header.recv_wc.recv_buf.grh = &response->grh;
 
         agent_send_response((const struct ib_mad_hdr *)response->mad,
                     &response->grh, wc,
                     port_priv->device,
                     opa_smi_get_fwd_port(smp),
                     qp_info->qp->qp_num,
                     recv->header.wc.byte_len,
                     true);
 
         return IB_SMI_DISCARD;
     }
 
     return IB_SMI_HANDLE;
 }
 
 static enum smi_action
 handle_smi(struct ib_mad_port_private *port_priv,
        struct ib_mad_qp_info *qp_info,
        struct ib_wc *wc,
        u32 port_num,
        struct ib_mad_private *recv,
        struct ib_mad_private *response,
        bool opa)
 {
     struct ib_mad_hdr *mad_hdr = (struct ib_mad_hdr *)recv->mad;
 
     if (opa && mad_hdr->base_version == OPA_MGMT_BASE_VERSION &&
         mad_hdr->class_version == OPA_SM_CLASS_VERSION)
         return handle_opa_smi(port_priv, qp_info, wc, port_num, recv,
                       response);
 
     return handle_ib_smi(port_priv, qp_info, wc, port_num, recv, response);
 }
 
 static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     struct ib_mad_port_private *port_priv = cq->cq_context;
     struct ib_mad_list_head *mad_list =
         container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
     struct ib_mad_qp_info *qp_info;
     struct ib_mad_private_header *mad_priv_hdr;
     struct ib_mad_private *recv, *response = NULL;
     struct ib_mad_agent_private *mad_agent;
     u32 port_num;
     int ret = IB_MAD_RESULT_SUCCESS;
     size_t mad_size;
     u16 resp_mad_pkey_index = 0;
     bool opa;
 
     if (list_empty_careful(&port_priv->port_list))
         return;
 
     if (wc->status != IB_WC_SUCCESS) {
         /*
          * Receive errors indicate that the QP has entered the error
          * state - error handling/shutdown code will cleanup
          */
         return;
     }
 
     qp_info = mad_list->mad_queue->qp_info;
     dequeue_mad(mad_list);
 
     opa = rdma_cap_opa_mad(qp_info->port_priv->device,
                    qp_info->port_priv->port_num);
 
     mad_priv_hdr = container_of(mad_list, struct ib_mad_private_header,
                     mad_list);
     recv = container_of(mad_priv_hdr, struct ib_mad_private, header);
     ib_dma_unmap_single(port_priv->device,
                 recv->header.mapping,
                 mad_priv_dma_size(recv),
                 DMA_FROM_DEVICE);
 
     /* Setup MAD receive work completion from "normal" work completion */
     recv->header.wc = *wc;
     recv->header.recv_wc.wc = &recv->header.wc;
 
     if (opa && ((struct ib_mad_hdr *)(recv->mad))->base_version == OPA_MGMT_BASE_VERSION) {
         recv->header.recv_wc.mad_len = wc->byte_len - sizeof(struct ib_grh);
         recv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
     } else {
         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
         recv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
     }
 
     recv->header.recv_wc.recv_buf.mad = (struct ib_mad *)recv->mad;
     recv->header.recv_wc.recv_buf.grh = &recv->grh;
 
     /* Validate MAD */
     if (!validate_mad((const struct ib_mad_hdr *)recv->mad, qp_info, opa))
         goto out;
 
     trace_ib_mad_recv_done_handler(qp_info, wc,
                        (struct ib_mad_hdr *)recv->mad);
 
     mad_size = recv->mad_size;
     response = alloc_mad_private(mad_size, GFP_KERNEL);
     if (!response)
         goto out;
 
     if (rdma_cap_ib_switch(port_priv->device))
         port_num = wc->port_num;
     else
         port_num = port_priv->port_num;
 
     if (((struct ib_mad_hdr *)recv->mad)->mgmt_class ==
         IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
         if (handle_smi(port_priv, qp_info, wc, port_num, recv,
                    response, opa)
             == IB_SMI_DISCARD)
             goto out;
     }
 
     /* Give driver "right of first refusal" on incoming MAD */
     if (port_priv->device->ops.process_mad) {
         ret = port_priv->device->ops.process_mad(
             port_priv->device, 0, port_priv->port_num, wc,
             &recv->grh, (const struct ib_mad *)recv->mad,
             (struct ib_mad *)response->mad, &mad_size,
             &resp_mad_pkey_index);
 
         if (opa)
             wc->pkey_index = resp_mad_pkey_index;
 
         if (ret & IB_MAD_RESULT_SUCCESS) {
             if (ret & IB_MAD_RESULT_CONSUMED)
                 goto out;
             if (ret & IB_MAD_RESULT_REPLY) {
                 agent_send_response((const struct ib_mad_hdr *)response->mad,
                             &recv->grh, wc,
                             port_priv->device,
                             port_num,
                             qp_info->qp->qp_num,
                             mad_size, opa);
                 goto out;
             }
         }
     }
 
     mad_agent = find_mad_agent(port_priv, (const struct ib_mad_hdr *)recv->mad);
     if (mad_agent) {
         trace_ib_mad_recv_done_agent(mad_agent);
         ib_mad_complete_recv(mad_agent, &recv->header.recv_wc);
         /*
          * recv is freed up in error cases in ib_mad_complete_recv
          * or via recv_handler in ib_mad_complete_recv()
          */
         recv = NULL;
     } else if ((ret & IB_MAD_RESULT_SUCCESS) &&
            generate_unmatched_resp(recv, response, &mad_size, opa)) {
         agent_send_response((const struct ib_mad_hdr *)response->mad, &recv->grh, wc,
                     port_priv->device, port_num,
                     qp_info->qp->qp_num, mad_size, opa);
     }
 
 out:
     /* Post another receive request for this QP */
     if (response) {
         ib_mad_post_receive_mads(qp_info, response);
         kfree(recv);
     } else
         ib_mad_post_receive_mads(qp_info, recv);
 }
 
 static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
 {
     struct ib_mad_send_wr_private *mad_send_wr;
     unsigned long delay;
 
     if (list_empty(&mad_agent_priv->wait_list)) {
         cancel_delayed_work(&mad_agent_priv->timed_work);
     } else {
         mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
                      struct ib_mad_send_wr_private,
                      agent_list);
 
         if (time_after(mad_agent_priv->timeout,
                    mad_send_wr->timeout)) {
             mad_agent_priv->timeout = mad_send_wr->timeout;
             delay = mad_send_wr->timeout - jiffies;
             if ((long)delay <= 0)
                 delay = 1;
             mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
                      &mad_agent_priv->timed_work, delay);
         }
     }
 }
 
 static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_send_wr_private *temp_mad_send_wr;
     struct list_head *list_item;
     unsigned long delay;
 
     mad_agent_priv = mad_send_wr->mad_agent_priv;
     list_del(&mad_send_wr->agent_list);
 
     delay = mad_send_wr->timeout;
     mad_send_wr->timeout += jiffies;
 
     if (delay) {
         list_for_each_prev(list_item, &mad_agent_priv->wait_list) {
             temp_mad_send_wr = list_entry(list_item,
                         struct ib_mad_send_wr_private,
                         agent_list);
             if (time_after(mad_send_wr->timeout,
                        temp_mad_send_wr->timeout))
                 break;
         }
     } else {
         list_item = &mad_agent_priv->wait_list;
     }
 
     list_add(&mad_send_wr->agent_list, list_item);
 
     /* Reschedule a work item if we have a shorter timeout */
     if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
         mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
                  &mad_agent_priv->timed_work, delay);
 }
 
 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
               unsigned long timeout_ms)
 {
     mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
     wait_for_response(mad_send_wr);
 }
 
 /*
  * Process a send work completion
  */
 void ib_mad_complete_send_wr(struct ib_mad_send_wr_private *mad_send_wr,
                  struct ib_mad_send_wc *mad_send_wc)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     unsigned long           flags;
     int             ret;
 
     mad_agent_priv = mad_send_wr->mad_agent_priv;
     spin_lock_irqsave(&mad_agent_priv->lock, flags);
     if (ib_mad_kernel_rmpp_agent(&mad_agent_priv->agent)) {
         ret = ib_process_rmpp_send_wc(mad_send_wr, mad_send_wc);
         if (ret == IB_RMPP_RESULT_CONSUMED)
             goto done;
     } else
         ret = IB_RMPP_RESULT_UNHANDLED;
 
     if (mad_send_wc->status != IB_WC_SUCCESS &&
         mad_send_wr->status == IB_WC_SUCCESS) {
         mad_send_wr->status = mad_send_wc->status;
         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
     }
 
     if (--mad_send_wr->refcount > 0) {
         if (mad_send_wr->refcount == 1 && mad_send_wr->timeout &&
             mad_send_wr->status == IB_WC_SUCCESS) {
             wait_for_response(mad_send_wr);
         }
         goto done;
     }
 
     /* Remove send from MAD agent and notify client of completion */
     list_del(&mad_send_wr->agent_list);
     adjust_timeout(mad_agent_priv);
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 
     if (mad_send_wr->status != IB_WC_SUCCESS)
         mad_send_wc->status = mad_send_wr->status;
     if (ret == IB_RMPP_RESULT_INTERNAL)
         ib_rmpp_send_handler(mad_send_wc);
     else
         mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
                            mad_send_wc);
 
     /* Release reference on agent taken when sending */
     deref_mad_agent(mad_agent_priv);
     return;
 done:
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 }
 
 static void ib_mad_send_done(struct ib_cq *cq, struct ib_wc *wc)
 {
     struct ib_mad_port_private *port_priv = cq->cq_context;
     struct ib_mad_list_head *mad_list =
         container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
     struct ib_mad_send_wr_private   *mad_send_wr, *queued_send_wr;
     struct ib_mad_qp_info       *qp_info;
     struct ib_mad_queue     *send_queue;
     struct ib_mad_send_wc       mad_send_wc;
     unsigned long flags;
     int ret;
 
     if (list_empty_careful(&port_priv->port_list))
         return;
 
     if (wc->status != IB_WC_SUCCESS) {
         if (!ib_mad_send_error(port_priv, wc))
             return;
     }
 
     mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
                    mad_list);
     send_queue = mad_list->mad_queue;
     qp_info = send_queue->qp_info;
 
     trace_ib_mad_send_done_agent(mad_send_wr->mad_agent_priv);
     trace_ib_mad_send_done_handler(mad_send_wr, wc);
 
 retry:
     ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
                 mad_send_wr->header_mapping,
                 mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
     ib_dma_unmap_single(mad_send_wr->send_buf.mad_agent->device,
                 mad_send_wr->payload_mapping,
                 mad_send_wr->sg_list[1].length, DMA_TO_DEVICE);
     queued_send_wr = NULL;
     spin_lock_irqsave(&send_queue->lock, flags);
     list_del(&mad_list->list);
 
     /* Move queued send to the send queue */
     if (send_queue->count-- > send_queue->max_active) {
         mad_list = container_of(qp_info->overflow_list.next,
                     struct ib_mad_list_head, list);
         queued_send_wr = container_of(mad_list,
                     struct ib_mad_send_wr_private,
                     mad_list);
         list_move_tail(&mad_list->list, &send_queue->list);
     }
     spin_unlock_irqrestore(&send_queue->lock, flags);
 
     mad_send_wc.send_buf = &mad_send_wr->send_buf;
     mad_send_wc.status = wc->status;
     mad_send_wc.vendor_err = wc->vendor_err;
     ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);
 
     if (queued_send_wr) {
         trace_ib_mad_send_done_resend(queued_send_wr, qp_info);
         ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr.wr,
                    NULL);
         if (ret) {
             dev_err(&port_priv->device->dev,
                 "ib_post_send failed: %d\n", ret);
             mad_send_wr = queued_send_wr;
             wc->status = IB_WC_LOC_QP_OP_ERR;
             goto retry;
         }
     }
 }
 
 static void mark_sends_for_retry(struct ib_mad_qp_info *qp_info)
 {
     struct ib_mad_send_wr_private *mad_send_wr;
     struct ib_mad_list_head *mad_list;
     unsigned long flags;
 
     spin_lock_irqsave(&qp_info->send_queue.lock, flags);
     list_for_each_entry(mad_list, &qp_info->send_queue.list, list) {
         mad_send_wr = container_of(mad_list,
                        struct ib_mad_send_wr_private,
                        mad_list);
         mad_send_wr->retry = 1;
     }
     spin_unlock_irqrestore(&qp_info->send_queue.lock, flags);
 }
 
 static bool ib_mad_send_error(struct ib_mad_port_private *port_priv,
         struct ib_wc *wc)
 {
     struct ib_mad_list_head *mad_list =
         container_of(wc->wr_cqe, struct ib_mad_list_head, cqe);
     struct ib_mad_qp_info *qp_info = mad_list->mad_queue->qp_info;
     struct ib_mad_send_wr_private *mad_send_wr;
     int ret;
 
     /*
      * Send errors will transition the QP to SQE - move
      * QP to RTS and repost flushed work requests
      */
     mad_send_wr = container_of(mad_list, struct ib_mad_send_wr_private,
                    mad_list);
     if (wc->status == IB_WC_WR_FLUSH_ERR) {
         if (mad_send_wr->retry) {
             /* Repost send */
             mad_send_wr->retry = 0;
             trace_ib_mad_error_handler(mad_send_wr, qp_info);
             ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr.wr,
                        NULL);
             if (!ret)
                 return false;
         }
     } else {
         struct ib_qp_attr *attr;
 
         /* Transition QP to RTS and fail offending send */
         attr = kmalloc(sizeof *attr, GFP_KERNEL);
         if (attr) {
             attr->qp_state = IB_QPS_RTS;
             attr->cur_qp_state = IB_QPS_SQE;
             ret = ib_modify_qp(qp_info->qp, attr,
                        IB_QP_STATE | IB_QP_CUR_STATE);
             kfree(attr);
             if (ret)
                 dev_err(&port_priv->device->dev,
                     "%s - ib_modify_qp to RTS: %d\n",
                     __func__, ret);
             else
                 mark_sends_for_retry(qp_info);
         }
     }
 
     return true;
 }
 
 static void cancel_mads(struct ib_mad_agent_private *mad_agent_priv)
 {
     unsigned long flags;
     struct ib_mad_send_wr_private *mad_send_wr, *temp_mad_send_wr;
     struct ib_mad_send_wc mad_send_wc;
     struct list_head cancel_list;
 
     INIT_LIST_HEAD(&cancel_list);
 
     spin_lock_irqsave(&mad_agent_priv->lock, flags);
     list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
                  &mad_agent_priv->send_list, agent_list) {
         if (mad_send_wr->status == IB_WC_SUCCESS) {
             mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
             mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
         }
     }
 
     /* Empty wait list to prevent receives from finding a request */
     list_splice_init(&mad_agent_priv->wait_list, &cancel_list);
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 
     /* Report all cancelled requests */
     mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
     mad_send_wc.vendor_err = 0;
 
     list_for_each_entry_safe(mad_send_wr, temp_mad_send_wr,
                  &cancel_list, agent_list) {
         mad_send_wc.send_buf = &mad_send_wr->send_buf;
         list_del(&mad_send_wr->agent_list);
         mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
                            &mad_send_wc);
         deref_mad_agent(mad_agent_priv);
     }
 }
 
 static struct ib_mad_send_wr_private*
 find_send_wr(struct ib_mad_agent_private *mad_agent_priv,
          struct ib_mad_send_buf *send_buf)
 {
     struct ib_mad_send_wr_private *mad_send_wr;
 
     list_for_each_entry(mad_send_wr, &mad_agent_priv->wait_list,
                 agent_list) {
         if (&mad_send_wr->send_buf == send_buf)
             return mad_send_wr;
     }
 
     list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
                 agent_list) {
         if (is_rmpp_data_mad(mad_agent_priv,
                      mad_send_wr->send_buf.mad) &&
             &mad_send_wr->send_buf == send_buf)
             return mad_send_wr;
     }
     return NULL;
 }
 
 int ib_modify_mad(struct ib_mad_send_buf *send_buf, u32 timeout_ms)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_send_wr_private *mad_send_wr;
     unsigned long flags;
     int active;
 
     if (!send_buf)
         return -EINVAL;
 
     mad_agent_priv = container_of(send_buf->mad_agent,
                       struct ib_mad_agent_private, agent);
     spin_lock_irqsave(&mad_agent_priv->lock, flags);
     mad_send_wr = find_send_wr(mad_agent_priv, send_buf);
     if (!mad_send_wr || mad_send_wr->status != IB_WC_SUCCESS) {
         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
         return -EINVAL;
     }
 
     active = (!mad_send_wr->timeout || mad_send_wr->refcount > 1);
     if (!timeout_ms) {
         mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
         mad_send_wr->refcount -= (mad_send_wr->timeout > 0);
     }
 
     mad_send_wr->send_buf.timeout_ms = timeout_ms;
     if (active)
         mad_send_wr->timeout = msecs_to_jiffies(timeout_ms);
     else
         ib_reset_mad_timeout(mad_send_wr, timeout_ms);
 
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
     return 0;
 }
 EXPORT_SYMBOL(ib_modify_mad);
 
 static void local_completions(struct work_struct *work)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_local_private *local;
     struct ib_mad_agent_private *recv_mad_agent;
     unsigned long flags;
     int free_mad;
     struct ib_wc wc;
     struct ib_mad_send_wc mad_send_wc;
     bool opa;
 
     mad_agent_priv =
         container_of(work, struct ib_mad_agent_private, local_work);
 
     opa = rdma_cap_opa_mad(mad_agent_priv->qp_info->port_priv->device,
                    mad_agent_priv->qp_info->port_priv->port_num);
 
     spin_lock_irqsave(&mad_agent_priv->lock, flags);
     while (!list_empty(&mad_agent_priv->local_list)) {
         local = list_entry(mad_agent_priv->local_list.next,
                    struct ib_mad_local_private,
                    completion_list);
         list_del(&local->completion_list);
         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
         free_mad = 0;
         if (local->mad_priv) {
             u8 base_version;
             recv_mad_agent = local->recv_mad_agent;
             if (!recv_mad_agent) {
                 dev_err(&mad_agent_priv->agent.device->dev,
                     "No receive MAD agent for local completion\n");
                 free_mad = 1;
                 goto local_send_completion;
             }
 
             /*
              * Defined behavior is to complete response
              * before request
              */
             build_smp_wc(recv_mad_agent->agent.qp,
                      local->mad_send_wr->send_wr.wr.wr_cqe,
                      be16_to_cpu(IB_LID_PERMISSIVE),
                      local->mad_send_wr->send_wr.pkey_index,
                      recv_mad_agent->agent.port_num, &wc);
 
             local->mad_priv->header.recv_wc.wc = &wc;
 
             base_version = ((struct ib_mad_hdr *)(local->mad_priv->mad))->base_version;
             if (opa && base_version == OPA_MGMT_BASE_VERSION) {
                 local->mad_priv->header.recv_wc.mad_len = local->return_wc_byte_len;
                 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct opa_mad);
             } else {
                 local->mad_priv->header.recv_wc.mad_len = sizeof(struct ib_mad);
                 local->mad_priv->header.recv_wc.mad_seg_size = sizeof(struct ib_mad);
             }
 
             INIT_LIST_HEAD(&local->mad_priv->header.recv_wc.rmpp_list);
             list_add(&local->mad_priv->header.recv_wc.recv_buf.list,
                  &local->mad_priv->header.recv_wc.rmpp_list);
             local->mad_priv->header.recv_wc.recv_buf.grh = NULL;
             local->mad_priv->header.recv_wc.recv_buf.mad =
                         (struct ib_mad *)local->mad_priv->mad;
             recv_mad_agent->agent.recv_handler(
                         &recv_mad_agent->agent,
                         &local->mad_send_wr->send_buf,
                         &local->mad_priv->header.recv_wc);
             spin_lock_irqsave(&recv_mad_agent->lock, flags);
             deref_mad_agent(recv_mad_agent);
             spin_unlock_irqrestore(&recv_mad_agent->lock, flags);
         }
 
 local_send_completion:
         /* Complete send */
         mad_send_wc.status = IB_WC_SUCCESS;
         mad_send_wc.vendor_err = 0;
         mad_send_wc.send_buf = &local->mad_send_wr->send_buf;
         mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
                            &mad_send_wc);
 
         spin_lock_irqsave(&mad_agent_priv->lock, flags);
         deref_mad_agent(mad_agent_priv);
         if (free_mad)
             kfree(local->mad_priv);
         kfree(local);
     }
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 }
 
 static int retry_send(struct ib_mad_send_wr_private *mad_send_wr)
 {
     int ret;
 
     if (!mad_send_wr->retries_left)
         return -ETIMEDOUT;
 
     mad_send_wr->retries_left--;
     mad_send_wr->send_buf.retries++;
 
     mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 
     if (ib_mad_kernel_rmpp_agent(&mad_send_wr->mad_agent_priv->agent)) {
         ret = ib_retry_rmpp(mad_send_wr);
         switch (ret) {
         case IB_RMPP_RESULT_UNHANDLED:
             ret = ib_send_mad(mad_send_wr);
             break;
         case IB_RMPP_RESULT_CONSUMED:
             ret = 0;
             break;
         default:
             ret = -ECOMM;
             break;
         }
     } else
         ret = ib_send_mad(mad_send_wr);
 
     if (!ret) {
         mad_send_wr->refcount++;
         list_add_tail(&mad_send_wr->agent_list,
                   &mad_send_wr->mad_agent_priv->send_list);
     }
     return ret;
 }
 
 static void timeout_sends(struct work_struct *work)
 {
     struct ib_mad_agent_private *mad_agent_priv;
     struct ib_mad_send_wr_private *mad_send_wr;
     struct ib_mad_send_wc mad_send_wc;
     unsigned long flags, delay;
 
     mad_agent_priv = container_of(work, struct ib_mad_agent_private,
                       timed_work.work);
     mad_send_wc.vendor_err = 0;
 
     spin_lock_irqsave(&mad_agent_priv->lock, flags);
     while (!list_empty(&mad_agent_priv->wait_list)) {
         mad_send_wr = list_entry(mad_agent_priv->wait_list.next,
                      struct ib_mad_send_wr_private,
                      agent_list);
 
         if (time_after(mad_send_wr->timeout, jiffies)) {
             delay = mad_send_wr->timeout - jiffies;
             if ((long)delay <= 0)
                 delay = 1;
             queue_delayed_work(mad_agent_priv->qp_info->
                        port_priv->wq,
                        &mad_agent_priv->timed_work, delay);
             break;
         }
 
         list_del(&mad_send_wr->agent_list);
         if (mad_send_wr->status == IB_WC_SUCCESS &&
             !retry_send(mad_send_wr))
             continue;
 
         spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 
         if (mad_send_wr->status == IB_WC_SUCCESS)
             mad_send_wc.status = IB_WC_RESP_TIMEOUT_ERR;
         else
             mad_send_wc.status = mad_send_wr->status;
         mad_send_wc.send_buf = &mad_send_wr->send_buf;
         mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
                            &mad_send_wc);
 
         deref_mad_agent(mad_agent_priv);
         spin_lock_irqsave(&mad_agent_priv->lock, flags);
     }
     spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
 }
 
 /*
  * Allocate receive MADs and post receive WRs for them
  */
 static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info,
                     struct ib_mad_private *mad)
 {
     unsigned long flags;
     int post, ret;
     struct ib_mad_private *mad_priv;
     struct ib_sge sg_list;
     struct ib_recv_wr recv_wr;
     struct ib_mad_queue *recv_queue = &qp_info->recv_queue;
 
     /* Initialize common scatter list fields */
     sg_list.lkey = qp_info->port_priv->pd->local_dma_lkey;
 
     /* Initialize common receive WR fields */
     recv_wr.next = NULL;
     recv_wr.sg_list = &sg_list;
     recv_wr.num_sge = 1;
 
     do {
         /* Allocate and map receive buffer */
         if (mad) {
             mad_priv = mad;
             mad = NULL;
         } else {
             mad_priv = alloc_mad_private(port_mad_size(qp_info->port_priv),
                              GFP_ATOMIC);
             if (!mad_priv) {
                 ret = -ENOMEM;
                 break;
             }
         }
         sg_list.length = mad_priv_dma_size(mad_priv);
         sg_list.addr = ib_dma_map_single(qp_info->port_priv->device,
                          &mad_priv->grh,
                          mad_priv_dma_size(mad_priv),
                          DMA_FROM_DEVICE);
         if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device,
                           sg_list.addr))) {
             kfree(mad_priv);
             ret = -ENOMEM;
             break;
         }
         mad_priv->header.mapping = sg_list.addr;
         mad_priv->header.mad_list.mad_queue = recv_queue;
         mad_priv->header.mad_list.cqe.done = ib_mad_recv_done;
         recv_wr.wr_cqe = &mad_priv->header.mad_list.cqe;
 
         /* Post receive WR */
         spin_lock_irqsave(&recv_queue->lock, flags);
         post = (++recv_queue->count < recv_queue->max_active);
         list_add_tail(&mad_priv->header.mad_list.list, &recv_queue->list);
         spin_unlock_irqrestore(&recv_queue->lock, flags);
         ret = ib_post_recv(qp_info->qp, &recv_wr, NULL);
         if (ret) {
             spin_lock_irqsave(&recv_queue->lock, flags);
             list_del(&mad_priv->header.mad_list.list);
             recv_queue->count--;
             spin_unlock_irqrestore(&recv_queue->lock, flags);
             ib_dma_unmap_single(qp_info->port_priv->device,
                         mad_priv->header.mapping,
                         mad_priv_dma_size(mad_priv),
                         DMA_FROM_DEVICE);
             kfree(mad_priv);
             dev_err(&qp_info->port_priv->device->dev,
                 "ib_post_recv failed: %d\n", ret);
             break;
         }
     } while (post);
 
     return ret;
 }
 
 /*
  * Return all the posted receive MADs
  */
 static void cleanup_recv_queue(struct ib_mad_qp_info *qp_info)
 {
     struct ib_mad_private_header *mad_priv_hdr;
     struct ib_mad_private *recv;
     struct ib_mad_list_head *mad_list;
 
     if (!qp_info->qp)
         return;
 
     while (!list_empty(&qp_info->recv_queue.list)) {
 
         mad_list = list_entry(qp_info->recv_queue.list.next,
                       struct ib_mad_list_head, list);
         mad_priv_hdr = container_of(mad_list,
                         struct ib_mad_private_header,
                         mad_list);
         recv = container_of(mad_priv_hdr, struct ib_mad_private,
                     header);
 
         /* Remove from posted receive MAD list */
         list_del(&mad_list->list);
 
         ib_dma_unmap_single(qp_info->port_priv->device,
                     recv->header.mapping,
                     mad_priv_dma_size(recv),
                     DMA_FROM_DEVICE);
         kfree(recv);
     }
 
     qp_info->recv_queue.count = 0;
 }
 
 /*
  * Start the port
  */
 static int ib_mad_port_start(struct ib_mad_port_private *port_priv)
 {
     int ret, i;
     struct ib_qp_attr *attr;
     struct ib_qp *qp;
     u16 pkey_index;
 
     attr = kmalloc(sizeof *attr, GFP_KERNEL);
     if (!attr)
         return -ENOMEM;
 
     ret = ib_find_pkey(port_priv->device, port_priv->port_num,
                IB_DEFAULT_PKEY_FULL, &pkey_index);
     if (ret)
         pkey_index = 0;
 
     for (i = 0; i < IB_MAD_QPS_CORE; i++) {
         qp = port_priv->qp_info[i].qp;
         if (!qp)
             continue;
 
         /*
          * PKey index for QP1 is irrelevant but
          * one is needed for the Reset to Init transition
          */
         attr->qp_state = IB_QPS_INIT;
         attr->pkey_index = pkey_index;
         attr->qkey = (qp->qp_num == 0) ? 0 : IB_QP1_QKEY;
         ret = ib_modify_qp(qp, attr, IB_QP_STATE |
                          IB_QP_PKEY_INDEX | IB_QP_QKEY);
         if (ret) {
             dev_err(&port_priv->device->dev,
                 "Couldn't change QP%d state to INIT: %d\n",
                 i, ret);
             goto out;
         }
 
         attr->qp_state = IB_QPS_RTR;
         ret = ib_modify_qp(qp, attr, IB_QP_STATE);
         if (ret) {
             dev_err(&port_priv->device->dev,
                 "Couldn't change QP%d state to RTR: %d\n",
                 i, ret);
             goto out;
         }
 
         attr->qp_state = IB_QPS_RTS;
         attr->sq_psn = IB_MAD_SEND_Q_PSN;
         ret = ib_modify_qp(qp, attr, IB_QP_STATE | IB_QP_SQ_PSN);
         if (ret) {
             dev_err(&port_priv->device->dev,
                 "Couldn't change QP%d state to RTS: %d\n",
                 i, ret);
             goto out;
         }
     }
 
     ret = ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);
     if (ret) {
         dev_err(&port_priv->device->dev,
             "Failed to request completion notification: %d\n",
             ret);
         goto out;
     }
 
     for (i = 0; i < IB_MAD_QPS_CORE; i++) {
         if (!port_priv->qp_info[i].qp)
             continue;
 
         ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
         if (ret) {
             dev_err(&port_priv->device->dev,
                 "Couldn't post receive WRs\n");
             goto out;
         }
     }
 out:
     kfree(attr);
     return ret;
 }
 
 static void qp_event_handler(struct ib_event *event, void *qp_context)
 {
     struct ib_mad_qp_info   *qp_info = qp_context;
 
     /* It's worse than that! He's dead, Jim! */
     dev_err(&qp_info->port_priv->device->dev,
         "Fatal error (%d) on MAD QP (%u)\n",
         event->event, qp_info->qp->qp_num);
 }
 
 static void init_mad_queue(struct ib_mad_qp_info *qp_info,
                struct ib_mad_queue *mad_queue)
 {
     mad_queue->qp_info = qp_info;
     mad_queue->count = 0;
     spin_lock_init(&mad_queue->lock);
     INIT_LIST_HEAD(&mad_queue->list);
 }
 
 static void init_mad_qp(struct ib_mad_port_private *port_priv,
             struct ib_mad_qp_info *qp_info)
 {
     qp_info->port_priv = port_priv;
     init_mad_queue(qp_info, &qp_info->send_queue);
     init_mad_queue(qp_info, &qp_info->recv_queue);
     INIT_LIST_HEAD(&qp_info->overflow_list);
 }
 
 static int create_mad_qp(struct ib_mad_qp_info *qp_info,
              enum ib_qp_type qp_type)
 {
     struct ib_qp_init_attr  qp_init_attr;
     int ret;
 
     memset(&qp_init_attr, 0, sizeof qp_init_attr);
     qp_init_attr.send_cq = qp_info->port_priv->cq;
     qp_init_attr.recv_cq = qp_info->port_priv->cq;
     qp_init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
     qp_init_attr.cap.max_send_wr = mad_sendq_size;
     qp_init_attr.cap.max_recv_wr = mad_recvq_size;
     qp_init_attr.cap.max_send_sge = IB_MAD_SEND_REQ_MAX_SG;
     qp_init_attr.cap.max_recv_sge = IB_MAD_RECV_REQ_MAX_SG;
     qp_init_attr.qp_type = qp_type;
     qp_init_attr.port_num = qp_info->port_priv->port_num;
     qp_init_attr.qp_context = qp_info;
     qp_init_attr.event_handler = qp_event_handler;
     qp_info->qp = ib_create_qp(qp_info->port_priv->pd, &qp_init_attr);
     if (IS_ERR(qp_info->qp)) {
         dev_err(&qp_info->port_priv->device->dev,
             "Couldn't create ib_mad QP%d\n",
             get_spl_qp_index(qp_type));
         ret = PTR_ERR(qp_info->qp);
         goto error;
     }
     /* Use minimum queue sizes unless the CQ is resized */
     qp_info->send_queue.max_active = mad_sendq_size;
     qp_info->recv_queue.max_active = mad_recvq_size;
     return 0;
 
 error:
     return ret;
 }
 
 static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
 {
     if (!qp_info->qp)
         return;
 
     ib_destroy_qp(qp_info->qp);
 }
 
 /*
  * Open the port
  * Create the QP, PD, MR, and CQ if needed
  */
 static int ib_mad_port_open(struct ib_device *device,
                 u32 port_num)
 {
     int ret, cq_size;
     struct ib_mad_port_private *port_priv;
     unsigned long flags;
     char name[sizeof "ib_mad123"];
     int has_smi;
 
     if (WARN_ON(rdma_max_mad_size(device, port_num) < IB_MGMT_MAD_SIZE))
         return -EFAULT;
 
     if (WARN_ON(rdma_cap_opa_mad(device, port_num) &&
             rdma_max_mad_size(device, port_num) < OPA_MGMT_MAD_SIZE))
         return -EFAULT;
 
     /* Create new device info */
     port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
     if (!port_priv)
         return -ENOMEM;
 
     port_priv->device = device;
     port_priv->port_num = port_num;
     spin_lock_init(&port_priv->reg_lock);
     init_mad_qp(port_priv, &port_priv->qp_info[0]);
     init_mad_qp(port_priv, &port_priv->qp_info[1]);
 
     cq_size = mad_sendq_size + mad_recvq_size;
     has_smi = rdma_cap_ib_smi(device, port_num);
     if (has_smi)
         cq_size *= 2;
 
     port_priv->pd = ib_alloc_pd(device, 0);
     if (IS_ERR(port_priv->pd)) {
         dev_err(&device->dev, "Couldn't create ib_mad PD\n");
         ret = PTR_ERR(port_priv->pd);
         goto error3;
     }
 
     port_priv->cq = ib_alloc_cq(port_priv->device, port_priv, cq_size, 0,
             IB_POLL_UNBOUND_WORKQUEUE);
     if (IS_ERR(port_priv->cq)) {
         dev_err(&device->dev, "Couldn't create ib_mad CQ\n");
         ret = PTR_ERR(port_priv->cq);
         goto error4;
     }
 
     if (has_smi) {
         ret = create_mad_qp(&port_priv->qp_info[0], IB_QPT_SMI);
         if (ret)
             goto error6;
     }
     ret = create_mad_qp(&port_priv->qp_info[1], IB_QPT_GSI);
     if (ret)
         goto error7;
 
     snprintf(name, sizeof(name), "ib_mad%u", port_num);
     port_priv->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
     if (!port_priv->wq) {
         ret = -ENOMEM;
         goto error8;
     }
 
     spin_lock_irqsave(&ib_mad_port_list_lock, flags);
     list_add_tail(&port_priv->port_list, &ib_mad_port_list);
     spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 
     ret = ib_mad_port_start(port_priv);
     if (ret) {
         dev_err(&device->dev, "Couldn't start port\n");
         goto error9;
     }
 
     return 0;
 
 error9:
     spin_lock_irqsave(&ib_mad_port_list_lock, flags);
     list_del_init(&port_priv->port_list);
     spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 
     destroy_workqueue(port_priv->wq);
 error8:
     destroy_mad_qp(&port_priv->qp_info[1]);
 error7:
     destroy_mad_qp(&port_priv->qp_info[0]);
 error6:
     ib_free_cq(port_priv->cq);
     cleanup_recv_queue(&port_priv->qp_info[1]);
     cleanup_recv_queue(&port_priv->qp_info[0]);
 error4:
     ib_dealloc_pd(port_priv->pd);
 error3:
     kfree(port_priv);
 
     return ret;
 }
 
 /*
  * Close the port
  * If there are no classes using the port, free the port
  * resources (CQ, MR, PD, QP) and remove the port's info structure
  */
 static int ib_mad_port_close(struct ib_device *device, u32 port_num)
 {
     struct ib_mad_port_private *port_priv;
     unsigned long flags;
 
     spin_lock_irqsave(&ib_mad_port_list_lock, flags);
     port_priv = __ib_get_mad_port(device, port_num);
     if (port_priv == NULL) {
         spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
         dev_err(&device->dev, "Port %u not found\n", port_num);
         return -ENODEV;
     }
     list_del_init(&port_priv->port_list);
     spin_unlock_irqrestore(&ib_mad_port_list_lock, flags);
 
     destroy_workqueue(port_priv->wq);
     destroy_mad_qp(&port_priv->qp_info[1]);
     destroy_mad_qp(&port_priv->qp_info[0]);
     ib_free_cq(port_priv->cq);
     ib_dealloc_pd(port_priv->pd);
     cleanup_recv_queue(&port_priv->qp_info[1]);
     cleanup_recv_queue(&port_priv->qp_info[0]);
     /* XXX: Handle deallocation of MAD registration tables */
 
     kfree(port_priv);
 
     return 0;
 }
 
 static int ib_mad_init_device(struct ib_device *device)
 {
     int start, i;
     unsigned int count = 0;
     int ret;
 
     start = rdma_start_port(device);
 
     for (i = start; i <= rdma_end_port(device); i++) {
         if (!rdma_cap_ib_mad(device, i))
             continue;
 
         ret = ib_mad_port_open(device, i);
         if (ret) {
             dev_err(&device->dev, "Couldn't open port %d\n", i);
             goto error;
         }
         ret = ib_agent_port_open(device, i);
         if (ret) {
             dev_err(&device->dev,
                 "Couldn't open port %d for agents\n", i);
             goto error_agent;
         }
         count++;
     }
     if (!count)
         return -EOPNOTSUPP;
 
     return 0;
 
 error_agent:
     if (ib_mad_port_close(device, i))
         dev_err(&device->dev, "Couldn't close port %d\n", i);
 
 error:
     while (--i >= start) {
         if (!rdma_cap_ib_mad(device, i))
             continue;
 
         if (ib_agent_port_close(device, i))
             dev_err(&device->dev,
                 "Couldn't close port %d for agents\n", i);
         if (ib_mad_port_close(device, i))
             dev_err(&device->dev, "Couldn't close port %d\n", i);
     }
     return ret;
 }
 
 static void ib_mad_remove_device(struct ib_device *device, void *client_data)
 {
     unsigned int i;
 
     rdma_for_each_port (device, i) {
         if (!rdma_cap_ib_mad(device, i))
             continue;
 
         if (ib_agent_port_close(device, i))
             dev_err(&device->dev,
                 "Couldn't close port %u for agents\n", i);
         if (ib_mad_port_close(device, i))
             dev_err(&device->dev, "Couldn't close port %u\n", i);
     }
 }
 
 static struct ib_client mad_client = {
     .name   = "mad",
     .add = ib_mad_init_device,
     .remove = ib_mad_remove_device
 };
 
 int ib_mad_init(void)
 {
     mad_recvq_size = min(mad_recvq_size, IB_MAD_QP_MAX_SIZE);
     mad_recvq_size = max(mad_recvq_size, IB_MAD_QP_MIN_SIZE);
 
     mad_sendq_size = min(mad_sendq_size, IB_MAD_QP_MAX_SIZE);
     mad_sendq_size = max(mad_sendq_size, IB_MAD_QP_MIN_SIZE);
 
     INIT_LIST_HEAD(&ib_mad_port_list);
 
     if (ib_register_client(&mad_client)) {
         pr_err("Couldn't register ib_mad client\n");
         return -EINVAL;
     }
 
     return 0;
 }
 
 void ib_mad_cleanup(void)
 {
     ib_unregister_client(&mad_client);
 }