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mad.c

/*
 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
 * Copyright (c) 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies Ltd.  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.
 *
 * $Id: mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
 */
#include <linux/dma-mapping.h>
#include <rdma/ib_cache.h>

#include "mad_priv.h"
#include "mad_rmpp.h"
#include "smi.h"
#include "agent.h"

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("kernel IB MAD API");
MODULE_AUTHOR("Hal Rosenstock");
MODULE_AUTHOR("Sean Hefty");

static kmem_cache_t *ib_mad_cache;

static struct list_head ib_mad_port_list;
static u32 ib_mad_client_id = 0;

/* Port list lock */
static spinlock_t 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,
                              struct ib_mad *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(void *data);
static void local_completions(void *data);
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);

/*
 * 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, int 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, int 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(struct ib_mad *mad)
{
      return ((mad->mad_hdr.method & IB_MGMT_METHOD_RESP) ||
            (mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) ||
            ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_BM) &&
             (mad->mad_hdr.attr_mod & IB_BM_ATTR_MOD_RESP)));
}
EXPORT_SYMBOL(ib_response_mad);

/*
 * ib_register_mad_agent - Register to send/receive MADs
 */
struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
                                 u8 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)
{
      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;
      unsigned long flags;
      u8 mgmt_class, vclass;

      /* Validate parameters */
      qpn = get_spl_qp_index(qp_type);
      if (qpn == -1)
            goto error1;

      if (rmpp_version && rmpp_version != IB_MGMT_RMPP_VERSION)
            goto error1;

      /* Validate MAD registration request if supplied */
      if (mad_reg_req) {
            if (mad_reg_req->mgmt_class_version >= MAX_MGMT_VERSION)
                  goto error1;
            if (!recv_handler)
                  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)
                        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
                   */
                  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))
                        goto error1;
            }
            /* Make sure class supplied is consistent with RMPP */
            if (!ib_is_mad_class_rmpp(mad_reg_req->mgmt_class)) {
                  if (rmpp_version)
                        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))
                        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))
                        goto error1;
            }
      } else {
            /* No registration request supplied */
            if (!send_handler)
                  goto error1;
      }

      /* Validate device and port */
      port_priv = ib_get_mad_port(device, port_num);
      if (!port_priv) {
            ret = ERR_PTR(-ENODEV);
            goto error1;
      }

      /* Allocate structures */
      mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL);
      if (!mad_agent_priv) {
            ret = ERR_PTR(-ENOMEM);
            goto error1;
      }

      mad_agent_priv->agent.mr = ib_get_dma_mr(port_priv->qp_info[qpn].qp->pd,
                                     IB_ACCESS_LOCAL_WRITE);
      if (IS_ERR(mad_agent_priv->agent.mr)) {
            ret = ERR_PTR(-ENOMEM);
            goto error2;
      }

      if (mad_reg_req) {
            reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
            if (!reg_req) {
                  ret = ERR_PTR(-ENOMEM);
                  goto error3;
            }
            /* Make a copy of the MAD registration request */
            memcpy(reg_req, mad_reg_req, sizeof *reg_req);
      }

      /* 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;

      spin_lock_irqsave(&port_priv->reg_lock, flags);
      mad_agent_priv->agent.hi_tid = ++ib_mad_client_id;

      /*
       * Make sure MAD registration (if supplied)
       * is non overlapping with any existing ones
       */
      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 error4;
                        }
                  }
                  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 error4;
                        }
                  }
                  ret2 = add_oui_reg_req(mad_reg_req, mad_agent_priv);
            }
            if (ret2) {
                  ret = ERR_PTR(ret2);
                  goto error4;
            }
      }

      /* Add mad agent into port's agent list */
      list_add_tail(&mad_agent_priv->agent_list, &port_priv->agent_list);
      spin_unlock_irqrestore(&port_priv->reg_lock, 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_WORK(&mad_agent_priv->timed_work, timeout_sends, mad_agent_priv);
      INIT_LIST_HEAD(&mad_agent_priv->local_list);
      INIT_WORK(&mad_agent_priv->local_work, local_completions,
               mad_agent_priv);
      atomic_set(&mad_agent_priv->refcount, 1);
      init_completion(&mad_agent_priv->comp);

      return &mad_agent_priv->agent;

error4:
      spin_unlock_irqrestore(&port_priv->reg_lock, flags);
      kfree(reg_req);
error3:
      ib_dereg_mr(mad_agent_priv->agent.mr);
error2:
      kfree(mad_agent_priv);
error1:
      return ret;
}
EXPORT_SYMBOL(ib_register_mad_agent);

static inline int is_snooping_sends(int mad_snoop_flags)
{
      return (mad_snoop_flags &
            (/*IB_MAD_SNOOP_POSTED_SENDS |
             IB_MAD_SNOOP_RMPP_SENDS |*/
             IB_MAD_SNOOP_SEND_COMPLETIONS /*|
             IB_MAD_SNOOP_RMPP_SEND_COMPLETIONS*/));
}

static inline int is_snooping_recvs(int mad_snoop_flags)
{
      return (mad_snoop_flags &
            (IB_MAD_SNOOP_RECVS /*|
             IB_MAD_SNOOP_RMPP_RECVS*/));
}

static int register_snoop_agent(struct ib_mad_qp_info *qp_info,
                        struct ib_mad_snoop_private *mad_snoop_priv)
{
      struct ib_mad_snoop_private **new_snoop_table;
      unsigned long flags;
      int i;

      spin_lock_irqsave(&qp_info->snoop_lock, flags);
      /* Check for empty slot in array. */
      for (i = 0; i < qp_info->snoop_table_size; i++)
            if (!qp_info->snoop_table[i])
                  break;

      if (i == qp_info->snoop_table_size) {
            /* Grow table. */
            new_snoop_table = kmalloc(sizeof mad_snoop_priv *
                                qp_info->snoop_table_size + 1,
                                GFP_ATOMIC);
            if (!new_snoop_table) {
                  i = -ENOMEM;
                  goto out;
            }
            if (qp_info->snoop_table) {
                  memcpy(new_snoop_table, qp_info->snoop_table,
                         sizeof mad_snoop_priv *
                         qp_info->snoop_table_size);
                  kfree(qp_info->snoop_table);
            }
            qp_info->snoop_table = new_snoop_table;
            qp_info->snoop_table_size++;
      }
      qp_info->snoop_table[i] = mad_snoop_priv;
      atomic_inc(&qp_info->snoop_count);
out:
      spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
      return i;
}

struct ib_mad_agent *ib_register_mad_snoop(struct ib_device *device,
                                 u8 port_num,
                                 enum ib_qp_type qp_type,
                                 int mad_snoop_flags,
                                 ib_mad_snoop_handler snoop_handler,
                                 ib_mad_recv_handler recv_handler,
                                 void *context)
{
      struct ib_mad_port_private *port_priv;
      struct ib_mad_agent *ret;
      struct ib_mad_snoop_private *mad_snoop_priv;
      int qpn;

      /* Validate parameters */
      if ((is_snooping_sends(mad_snoop_flags) && !snoop_handler) ||
          (is_snooping_recvs(mad_snoop_flags) && !recv_handler)) {
            ret = ERR_PTR(-EINVAL);
            goto error1;
      }
      qpn = get_spl_qp_index(qp_type);
      if (qpn == -1) {
            ret = ERR_PTR(-EINVAL);
            goto error1;
      }
      port_priv = ib_get_mad_port(device, port_num);
      if (!port_priv) {
            ret = ERR_PTR(-ENODEV);
            goto error1;
      }
      /* Allocate structures */
      mad_snoop_priv = kzalloc(sizeof *mad_snoop_priv, GFP_KERNEL);
      if (!mad_snoop_priv) {
            ret = ERR_PTR(-ENOMEM);
            goto error1;
      }

      /* Now, fill in the various structures */
      mad_snoop_priv->qp_info = &port_priv->qp_info[qpn];
      mad_snoop_priv->agent.device = device;
      mad_snoop_priv->agent.recv_handler = recv_handler;
      mad_snoop_priv->agent.snoop_handler = snoop_handler;
      mad_snoop_priv->agent.context = context;
      mad_snoop_priv->agent.qp = port_priv->qp_info[qpn].qp;
      mad_snoop_priv->agent.port_num = port_num;
      mad_snoop_priv->mad_snoop_flags = mad_snoop_flags;
      init_completion(&mad_snoop_priv->comp);
      mad_snoop_priv->snoop_index = register_snoop_agent(
                                    &port_priv->qp_info[qpn],
                                    mad_snoop_priv);
      if (mad_snoop_priv->snoop_index < 0) {
            ret = ERR_PTR(mad_snoop_priv->snoop_index);
            goto error2;
      }

      atomic_set(&mad_snoop_priv->refcount, 1);
      return &mad_snoop_priv->agent;

error2:
      kfree(mad_snoop_priv);
error1:
      return ret;
}
EXPORT_SYMBOL(ib_register_mad_snoop);

static inline void deref_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
{
      if (atomic_dec_and_test(&mad_agent_priv->refcount))
            complete(&mad_agent_priv->comp);
}

static inline void deref_snoop_agent(struct ib_mad_snoop_private *mad_snoop_priv)
{
      if (atomic_dec_and_test(&mad_snoop_priv->refcount))
            complete(&mad_snoop_priv->comp);
}

static void unregister_mad_agent(struct ib_mad_agent_private *mad_agent_priv)
{
      struct ib_mad_port_private *port_priv;
      unsigned long flags;

      /* Note that we could still be handling received MADs */

      /*
       * 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_irqsave(&port_priv->reg_lock, flags);
      remove_mad_reg_req(mad_agent_priv);
      list_del(&mad_agent_priv->agent_list);
      spin_unlock_irqrestore(&port_priv->reg_lock, flags);

      flush_workqueue(port_priv->wq);
      ib_cancel_rmpp_recvs(mad_agent_priv);

      deref_mad_agent(mad_agent_priv);
      wait_for_completion(&mad_agent_priv->comp);

      kfree(mad_agent_priv->reg_req);
      ib_dereg_mr(mad_agent_priv->agent.mr);
      kfree(mad_agent_priv);
}

static void unregister_mad_snoop(struct ib_mad_snoop_private *mad_snoop_priv)
{
      struct ib_mad_qp_info *qp_info;
      unsigned long flags;

      qp_info = mad_snoop_priv->qp_info;
      spin_lock_irqsave(&qp_info->snoop_lock, flags);
      qp_info->snoop_table[mad_snoop_priv->snoop_index] = NULL;
      atomic_dec(&qp_info->snoop_count);
      spin_unlock_irqrestore(&qp_info->snoop_lock, flags);

      deref_snoop_agent(mad_snoop_priv);
      wait_for_completion(&mad_snoop_priv->comp);

      kfree(mad_snoop_priv);
}

/*
 * ib_unregister_mad_agent - Unregisters a client from using MAD services
 */
int ib_unregister_mad_agent(struct ib_mad_agent *mad_agent)
{
      struct ib_mad_agent_private *mad_agent_priv;
      struct ib_mad_snoop_private *mad_snoop_priv;

      /* If the TID is zero, the agent can only snoop. */
      if (mad_agent->hi_tid) {
            mad_agent_priv = container_of(mad_agent,
                                    struct ib_mad_agent_private,
                                    agent);
            unregister_mad_agent(mad_agent_priv);
      } else {
            mad_snoop_priv = container_of(mad_agent,
                                    struct ib_mad_snoop_private,
                                    agent);
            unregister_mad_snoop(mad_snoop_priv);
      }
      return 0;
}
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;

      BUG_ON(!mad_list->mad_queue);
      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 snoop_send(struct ib_mad_qp_info *qp_info,
                   struct ib_mad_send_buf *send_buf,
                   struct ib_mad_send_wc *mad_send_wc,
                   int mad_snoop_flags)
{
      struct ib_mad_snoop_private *mad_snoop_priv;
      unsigned long flags;
      int i;

      spin_lock_irqsave(&qp_info->snoop_lock, flags);
      for (i = 0; i < qp_info->snoop_table_size; i++) {
            mad_snoop_priv = qp_info->snoop_table[i];
            if (!mad_snoop_priv ||
                !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
                  continue;

            atomic_inc(&mad_snoop_priv->refcount);
            spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
            mad_snoop_priv->agent.snoop_handler(&mad_snoop_priv->agent,
                                        send_buf, mad_send_wc);
            deref_snoop_agent(mad_snoop_priv);
            spin_lock_irqsave(&qp_info->snoop_lock, flags);
      }
      spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
}

static void snoop_recv(struct ib_mad_qp_info *qp_info,
                   struct ib_mad_recv_wc *mad_recv_wc,
                   int mad_snoop_flags)
{
      struct ib_mad_snoop_private *mad_snoop_priv;
      unsigned long flags;
      int i;

      spin_lock_irqsave(&qp_info->snoop_lock, flags);
      for (i = 0; i < qp_info->snoop_table_size; i++) {
            mad_snoop_priv = qp_info->snoop_table[i];
            if (!mad_snoop_priv ||
                !(mad_snoop_priv->mad_snoop_flags & mad_snoop_flags))
                  continue;

            atomic_inc(&mad_snoop_priv->refcount);
            spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
            mad_snoop_priv->agent.recv_handler(&mad_snoop_priv->agent,
                                       mad_recv_wc);
            deref_snoop_agent(mad_snoop_priv);
            spin_lock_irqsave(&qp_info->snoop_lock, flags);
      }
      spin_unlock_irqrestore(&qp_info->snoop_lock, flags);
}

static void build_smp_wc(u64 wr_id, u16 slid, u16 pkey_index, u8 port_num,
                   struct ib_wc *wc)
{
      memset(wc, 0, sizeof *wc);
      wc->wr_id = wr_id;
      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_num = IB_QP0;
      wc->slid = slid;
      wc->sl = 0;
      wc->dlid_path_bits = 0;
      wc->port_num = port_num;
}

/*
 * 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;
      struct ib_smp *smp = mad_send_wr->send_buf.mad;
      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;
      u8 port_num = mad_agent_priv->agent.port_num;
      struct ib_wc mad_wc;
      struct ib_send_wr *send_wr = &mad_send_wr->send_wr;

      /*
       * 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 ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
           IB_LID_PERMISSIVE &&
          !smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
            ret = -EINVAL;
            printk(KERN_ERR PFX "Invalid directed route\n");
            goto out;
      }
      /* Check to post send on QP or process locally */
      ret = smi_check_local_smp(smp, device);
      if (!ret)
            goto out;

      local = kmalloc(sizeof *local, GFP_ATOMIC);
      if (!local) {
            ret = -ENOMEM;
            printk(KERN_ERR PFX "No memory for ib_mad_local_private\n");
            goto out;
      }
      local->mad_priv = NULL;
      local->recv_mad_agent = NULL;
      mad_priv = kmem_cache_alloc(ib_mad_cache, GFP_ATOMIC);
      if (!mad_priv) {
            ret = -ENOMEM;
            printk(KERN_ERR PFX "No memory for local response MAD\n");
            kfree(local);
            goto out;
      }

      build_smp_wc(send_wr->wr_id, be16_to_cpu(smp->dr_slid),
                 send_wr->wr.ud.pkey_index,
                 send_wr->wr.ud.port_num, &mad_wc);

      /* No GRH for DR SMP */
      ret = device->process_mad(device, 0, port_num, &mad_wc, NULL,
                          (struct ib_mad *)smp,
                          (struct ib_mad *)&mad_priv->mad);
      switch (ret)
      {
      case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY:
            if (ib_response_mad(&mad_priv->mad.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
                   */
                  atomic_inc(&mad_agent_priv->refcount);
            } else
                  kmem_cache_free(ib_mad_cache, mad_priv);
            break;
      case IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED:
            kmem_cache_free(ib_mad_cache, 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) {
                  mad_priv->mad.mad.mad_hdr.tid =
                        ((struct ib_mad *)smp)->mad_hdr.tid;
                  recv_mad_agent = find_mad_agent(port_priv,
                                            &mad_priv->mad.mad);
            }
            if (!port_priv || !recv_mad_agent) {
                  kmem_cache_free(ib_mad_cache, mad_priv);
                  kfree(local);
                  ret = 0;
                  goto out;
            }
            local->mad_priv = mad_priv;
            local->recv_mad_agent = recv_mad_agent;
            break;
      default:
            kmem_cache_free(ib_mad_cache, mad_priv);
            kfree(local);
            ret = -EINVAL;
            goto out;
      }

      local->mad_send_wr = mad_send_wr;
      /* Reference MAD agent until send side of local completion handled */
      atomic_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)
{
      int seg_size, pad;

      seg_size = sizeof(struct ib_mad) - 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,
                        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 = sizeof (struct ib_mad) - send_buf->hdr_len;
      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) {
                  printk(KERN_ERR "alloc_send_rmpp_segs: RMPP mem "
                         "alloc failed for len %zd, gfp %#x\n",
                         sizeof (*seg) + seg_size, gfp_mask);
                  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;
}

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)
{
      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;

      mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
                              agent);
      pad = get_pad_size(hdr_len, data_len);
      message_size = hdr_len + data_len + pad;

      if ((!mad_agent->rmpp_version &&
           (rmpp_active || message_size > sizeof(struct ib_mad))) ||
          (!rmpp_active && message_size > sizeof(struct ib_mad)))
            return ERR_PTR(-EINVAL);

      size = rmpp_active ? hdr_len : sizeof(struct ib_mad);
      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->mr->lkey;
      mad_send_wr->sg_list[1].length = sizeof(struct ib_mad) - hdr_len;
      mad_send_wr->sg_list[1].lkey = mad_agent->mr->lkey;

      mad_send_wr->send_wr.wr_id = (unsigned long) mad_send_wr;
      mad_send_wr->send_wr.sg_list = mad_send_wr->sg_list;
      mad_send_wr->send_wr.num_sge = 2;
      mad_send_wr->send_wr.opcode = IB_WR_SEND;
      mad_send_wr->send_wr.send_flags = IB_SEND_SIGNALED;
      mad_send_wr->send_wr.wr.ud.remote_qpn = remote_qpn;
      mad_send_wr->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
      mad_send_wr->send_wr.wr.ud.pkey_index = pkey_index;

      if (rmpp_active) {
            ret = alloc_send_rmpp_list(mad_send_wr, gfp_mask);
            if (ret) {
                  kfree(buf);
                  return ERR_PTR(ret);
            }
      }

      mad_send_wr->send_buf.mad_agent = mad_agent;
      atomic_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_send_wr *bad_send_wr;
      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->send_wr.wr_id = (unsigned long)&mad_send_wr->mad_list;
      mad_send_wr->mad_list.mad_queue = &qp_info->send_queue;

      mad_agent = mad_send_wr->send_buf.mad_agent;
      sge = mad_send_wr->sg_list;
      sge[0].addr = dma_map_single(mad_agent->device->dma_device,
                             mad_send_wr->send_buf.mad,
                             sge[0].length,
                             DMA_TO_DEVICE);
      pci_unmap_addr_set(mad_send_wr, header_mapping, sge[0].addr);

      sge[1].addr = dma_map_single(mad_agent->device->dma_device,
                             ib_get_payload(mad_send_wr),
                             sge[1].length,
                             DMA_TO_DEVICE);
      pci_unmap_addr_set(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) {
            ret = ib_post_send(mad_agent->qp, &mad_send_wr->send_wr,
                           &bad_send_wr);
            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) {
            dma_unmap_single(mad_agent->device->dma_device,
                         pci_unmap_addr(mad_send_wr, header_mapping),
                         sge[0].length, DMA_TO_DEVICE);
            dma_unmap_single(mad_agent->device->dma_device,
                         pci_unmap_addr(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;

            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.wr.ud.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->retries = send_buf->retries;
            /* 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 */
            atomic_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 (mad_agent_priv->agent.rmpp_version) {
                  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);
                  atomic_dec(&mad_agent_priv->refcount);
                  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);
            kmem_cache_free(ib_mad_cache, priv);
      }
}
EXPORT_SYMBOL(ib_free_recv_mad);

struct ib_mad_agent *ib_redirect_mad_qp(struct ib_qp *qp,
                              u8 rmpp_version,
                              ib_mad_send_handler send_handler,
                              ib_mad_recv_handler recv_handler,
                              void *context)
{
      return ERR_PTR(-EINVAL);      /* XXX: for now */
}
EXPORT_SYMBOL(ib_redirect_mad_qp);

int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
                  struct ib_wc *wc)
{
      printk(KERN_ERR PFX "ib_process_mad_wc() not implemented yet\n");
      return 0;
}
EXPORT_SYMBOL(ib_process_mad_wc);

static int method_in_use(struct ib_mad_mgmt_method_table **method,
                   struct ib_mad_reg_req *mad_reg_req)
{
      int i;

      for (i = find_first_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS);
           i < IB_MGMT_MAX_METHODS;
           i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
                         1+i)) {
            if ((*method)->agent[i]) {
                  printk(KERN_ERR PFX "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);
      if (!*method) {
            printk(KERN_ERR PFX "No memory for "
                   "ib_mad_mgmt_method_table\n");
            return -ENOMEM;
      }

      return 0;
}

/*
 * 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,
                     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) {
                  printk(KERN_ERR PFX "No memory for "
                         "ib_mad_mgmt_class_table\n");
                  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 (i = find_first_bit(mad_reg_req->method_mask,
                        IB_MGMT_MAX_METHODS);
           i < IB_MGMT_MAX_METHODS;
           i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
                         1+i)) {
            (*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) {
                  printk(KERN_ERR PFX "No memory for "
                         "ib_mad_mgmt_vendor_class_table\n");
                  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) {
                  printk(KERN_ERR PFX "No memory for "
                         "ib_mad_mgmt_vendor_class\n");
                  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];
                  BUG_ON(!*method);
                  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];
                  BUG_ON(*method);
                  /* Allocate method table for this OUI */
                  if ((ret = allocate_method_table(method)))
                        goto error3;
                  memcpy((*vendor_table)->vendor_class[vclass]->oui[i],
                         mad_reg_req->oui, 3);
                  goto check_in_use;
            }
      }
      printk(KERN_ERR PFX "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 (i = find_first_bit(mad_reg_req->method_mask,
                        IB_MGMT_MAX_METHODS);
           i < IB_MGMT_MAX_METHODS;
           i = find_next_bit(mad_reg_req->method_mask, IB_MGMT_MAX_METHODS,
                         1+i)) {
            (*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,
             struct ib_mad *mad)
{
      struct ib_mad_agent_private *mad_agent = NULL;
      unsigned long flags;

      spin_lock_irqsave(&port_priv->reg_lock, flags);
      if (ib_response_mad(mad)) {
            u32 hi_tid;
            struct ib_mad_agent_private *entry;

            /*
             * Routing is based on high 32 bits of transaction ID
             * of MAD.
             */
            hi_tid = be64_to_cpu(mad->mad_hdr.tid) >> 32;
            list_for_each_entry(entry, &port_priv->agent_list, agent_list) {
                  if (entry->agent.hi_tid == hi_tid) {
                        mad_agent = entry;
                        break;
                  }
            }
      } 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;
            struct ib_vendor_mad *vendor_mad;
            int index;

            /*
             * Routing is based on version, class, and method
             * For "newer" vendor MADs, also based on OUI
             */
            if (mad->mad_hdr.class_version >= MAX_MGMT_VERSION)
                  goto out;
            if (!is_vendor_class(mad->mad_hdr.mgmt_class)) {
                  class = port_priv->version[
                              mad->mad_hdr.class_version].class;
                  if (!class)
                        goto out;
                  method = class->method_table[convert_mgmt_class(
                                          mad->mad_hdr.mgmt_class)];
                  if (method)
                        mad_agent = method->agent[mad->mad_hdr.method &
                                            ~IB_MGMT_METHOD_RESP];
            } else {
                  vendor = port_priv->version[
                              mad->mad_hdr.class_version].vendor;
                  if (!vendor)
                        goto out;
                  vendor_class = vendor->vendor_class[vendor_class_index(
                                    mad->mad_hdr.mgmt_class)];
                  if (!vendor_class)
                        goto out;
                  /* Find matching OUI */
                  vendor_mad = (struct ib_vendor_mad *)mad;
                  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->mad_hdr.method &
                                            ~IB_MGMT_METHOD_RESP];
                  }
            }
      }

      if (mad_agent) {
            if (mad_agent->agent.recv_handler)
                  atomic_inc(&mad_agent->refcount);
            else {
                  printk(KERN_NOTICE PFX "No receive handler for client "
                         "%p on port %d\n",
                         &mad_agent->agent, port_priv->port_num);
                  mad_agent = NULL;
            }
      }
out:
      spin_unlock_irqrestore(&port_priv->reg_lock, flags);

      return mad_agent;
}

static int validate_mad(struct ib_mad *mad, u32 qp_num)
{
      int valid = 0;

      /* Make sure MAD base version is understood */
      if (mad->mad_hdr.base_version != IB_MGMT_BASE_VERSION) {
            printk(KERN_ERR PFX "MAD received with unsupported base "
                   "version %d\n", mad->mad_hdr.base_version);
            goto out;
      }

      /* Filter SMI packets sent to other than QP0 */
      if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED) ||
          (mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)) {
            if (qp_num == 0)
                  valid = 1;
      } else {
            /* Filter GSI packets sent to QP0 */
            if (qp_num != 0)
                  valid = 1;
      }

out:
      return valid;
}

static int is_data_mad(struct ib_mad_agent_private *mad_agent_priv,
                   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_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(struct ib_mad_send_wr_private *wr,
                             struct ib_mad_recv_wc *rwc)
{
      return ((struct ib_mad *)(wr->send_buf.mad))->mad_hdr.mgmt_class ==
            rwc->recv_buf.mad->mad_hdr.mgmt_class;
}

static inline int rcv_has_same_gid(struct ib_mad_agent_private *mad_agent_priv,
                           struct ib_mad_send_wr_private *wr,
                           struct ib_mad_recv_wc *rwc )
{
      struct ib_ah_attr attr;
      u8 send_resp, rcv_resp;
      union ib_gid sgid;
      struct ib_device *device = mad_agent_priv->agent.device;
      u8 port_num = mad_agent_priv->agent.port_num;
      u8 lmc;

      send_resp = ((struct ib_mad *)(wr->send_buf.mad))->
                 mad_hdr.method & IB_MGMT_METHOD_RESP;
      rcv_resp = rwc->recv_buf.mad->mad_hdr.method & IB_MGMT_METHOD_RESP;

      if (send_resp == rcv_resp)
            /* both requests, or both responses. GIDs different */
            return 0;

      if (ib_query_ah(wr->send_buf.ah, &attr))
            /* Assume not equal, to avoid false positives. */
            return 0;

      if (!!(attr.ah_flags & IB_AH_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 (!(attr.ah_flags & IB_AH_GRH)) {
                  if (ib_get_cached_lmc(device, port_num, &lmc))
                        return 0;
                  return (!lmc || !((attr.src_path_bits ^
                                 rwc->wc->dlid_path_bits) &
                                ((1 << lmc) - 1)));
            } else {
                  if (ib_get_cached_gid(device, port_num,
                                    attr.grh.sgid_index, &sgid))
                        return 0;
                  return !memcmp(sgid.raw, rwc->recv_buf.grh->dgid.raw,
                               16);
            }
      }

      if (!(attr.ah_flags & IB_AH_GRH))
            return attr.dlid == rwc->wc->slid;
      else
            return !memcmp(attr.grh.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(struct ib_mad_agent_private *mad_agent_priv,
             struct ib_mad_recv_wc *wc)
{
      struct ib_mad_send_wr_private *wr;
      struct ib_mad *mad;

      mad = (struct ib_mad *)wc->recv_buf.mad;

      list_for_each_entry(wr, &mad_agent_priv->wait_list, agent_list) {
            if ((wr->tid == mad->mad_hdr.tid) &&
                rcv_has_same_class(wr, wc) &&
                /*
                 * Don't check GID for direct routed MADs.
                 * These might have permissive LIDs.
                 */
                (is_direct(wc->recv_buf.mad->mad_hdr.mgmt_class) ||
                 rcv_has_same_gid(mad_agent_priv, wr, wc)))
                  return wr;
      }

      /*
       * 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_data_mad(mad_agent_priv, wr->send_buf.mad) &&
                wr->tid == mad->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(wc->recv_buf.mad->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;

      INIT_LIST_HEAD(&mad_recv_wc->rmpp_list);
      list_add(&mad_recv_wc->recv_buf.list, &mad_recv_wc->rmpp_list);
      if (mad_agent_priv->agent.rmpp_version) {
            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)) {
            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);
                  ib_free_recv_mad(mad_recv_wc);
                  deref_mad_agent(mad_agent_priv);
                  return;
            }
            ib_mark_mad_done(mad_send_wr);
            spin_unlock_irqrestore(&mad_agent_priv->lock, flags);

            /* Defined behavior is to complete response before request */
            mad_recv_wc->wc->wr_id = (unsigned long) &mad_send_wr->send_buf;
            mad_agent_priv->agent.recv_handler(&mad_agent_priv->agent,
                                       mad_recv_wc);
            atomic_dec(&mad_agent_priv->refcount);

            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,
                                       mad_recv_wc);
            deref_mad_agent(mad_agent_priv);
      }
}

static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
                             struct ib_wc *wc)
{
      struct ib_mad_qp_info *qp_info;
      struct ib_mad_private_header *mad_priv_hdr;
      struct ib_mad_private *recv, *response;
      struct ib_mad_list_head *mad_list;
      struct ib_mad_agent_private *mad_agent;

      response = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
      if (!response)
            printk(KERN_ERR PFX "ib_mad_recv_done_handler no memory "
                   "for response buffer\n");

      mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
      qp_info = mad_list->mad_queue->qp_info;
      dequeue_mad(mad_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);
      dma_unmap_single(port_priv->device->dma_device,
                   pci_unmap_addr(&recv->header, mapping),
                   sizeof(struct ib_mad_private) -
                   sizeof(struct ib_mad_private_header),
                   DMA_FROM_DEVICE);

      /* Setup MAD receive work completion from "normal" work completion */
      recv->header.wc = *wc;
      recv->header.recv_wc.wc = &recv->header.wc;
      recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
      recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
      recv->header.recv_wc.recv_buf.grh = &recv->grh;

      if (atomic_read(&qp_info->snoop_count))
            snoop_recv(qp_info, &recv->header.recv_wc, IB_MAD_SNOOP_RECVS);

      /* Validate MAD */
      if (!validate_mad(&recv->mad.mad, qp_info->qp->qp_num))
            goto out;

      if (recv->mad.mad.mad_hdr.mgmt_class ==
          IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
            if (!smi_handle_dr_smp_recv(&recv->mad.smp,
                                  port_priv->device->node_type,
                                  port_priv->port_num,
                                  port_priv->device->phys_port_cnt))
                  goto out;
            if (!smi_check_forward_dr_smp(&recv->mad.smp))
                  goto local;
            if (!smi_handle_dr_smp_send(&recv->mad.smp,
                                  port_priv->device->node_type,
                                  port_priv->port_num))
                  goto out;
            if (!smi_check_local_smp(&recv->mad.smp, port_priv->device))
                  goto out;
      }

local:
      /* Give driver "right of first refusal" on incoming MAD */
      if (port_priv->device->process_mad) {
            int ret;

            if (!response) {
                  printk(KERN_ERR PFX "No memory for response MAD\n");
                  /*
                   * Is it better to assume that
                   * it wouldn't be processed ?
                   */
                  goto out;
            }

            ret = port_priv->device->process_mad(port_priv->device, 0,
                                         port_priv->port_num,
                                         wc, &recv->grh,
                                         &recv->mad.mad,
                                         &response->mad.mad);
            if (ret & IB_MAD_RESULT_SUCCESS) {
                  if (ret & IB_MAD_RESULT_CONSUMED)
                        goto out;
                  if (ret & IB_MAD_RESULT_REPLY) {
                        agent_send_response(&response->mad.mad,
                                        &recv->grh, wc,
                                        port_priv->device,
                                        port_priv->port_num,
                                        qp_info->qp->qp_num);
                        goto out;
                  }
            }
      }

      mad_agent = find_mad_agent(port_priv, &recv->mad.mad);
      if (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;
      }

out:
      /* Post another receive request for this QP */
      if (response) {
            ib_mad_post_receive_mads(qp_info, response);
            if (recv)
                  kmem_cache_free(ib_mad_cache, 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;
                  cancel_delayed_work(&mad_agent_priv->timed_work);
                  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);
            }
      }
}

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) {
            cancel_delayed_work(&mad_agent_priv->timed_work);
            queue_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,
                    int 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 (mad_agent_priv->agent.rmpp_version) {
            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_handler(struct ib_mad_port_private *port_priv,
                             struct ib_wc *wc)
{
      struct ib_mad_send_wr_private *mad_send_wr, *queued_send_wr;
      struct ib_mad_list_head       *mad_list;
      struct ib_mad_qp_info         *qp_info;
      struct ib_mad_queue           *send_queue;
      struct ib_send_wr       *bad_send_wr;
      struct ib_mad_send_wc         mad_send_wc;
      unsigned long flags;
      int ret;

      mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
      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;

retry:
      dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
                   pci_unmap_addr(mad_send_wr, header_mapping),
                   mad_send_wr->sg_list[0].length, DMA_TO_DEVICE);
      dma_unmap_single(mad_send_wr->send_buf.mad_agent->device->dma_device,
                   pci_unmap_addr(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;
      if (atomic_read(&qp_info->snoop_count))
            snoop_send(qp_info, &mad_send_wr->send_buf, &mad_send_wc,
                     IB_MAD_SNOOP_SEND_COMPLETIONS);
      ib_mad_complete_send_wr(mad_send_wr, &mad_send_wc);

      if (queued_send_wr) {
            ret = ib_post_send(qp_info->qp, &queued_send_wr->send_wr,
                           &bad_send_wr);
            if (ret) {
                  printk(KERN_ERR PFX "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 void mad_error_handler(struct ib_mad_port_private *port_priv,
                        struct ib_wc *wc)
{
      struct ib_mad_list_head *mad_list;
      struct ib_mad_qp_info *qp_info;
      struct ib_mad_send_wr_private *mad_send_wr;
      int ret;

      /* Determine if failure was a send or receive */
      mad_list = (struct ib_mad_list_head *)(unsigned long)wc->wr_id;
      qp_info = mad_list->mad_queue->qp_info;
      if (mad_list->mad_queue == &qp_info->recv_queue)
            /*
             * Receive errors indicate that the QP has entered the error
             * state - error handling/shutdown code will cleanup
             */
            return;

      /*
       * 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 */
                  struct ib_send_wr *bad_send_wr;

                  mad_send_wr->retry = 0;
                  ret = ib_post_send(qp_info->qp, &mad_send_wr->send_wr,
                              &bad_send_wr);
                  if (ret)
                        ib_mad_send_done_handler(port_priv, wc);
            } else
                  ib_mad_send_done_handler(port_priv, wc);
      } 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)
                        printk(KERN_ERR PFX "mad_error_handler - "
                               "ib_modify_qp to RTS : %d\n", ret);
                  else
                        mark_sends_for_retry(qp_info);
            }
            ib_mad_send_done_handler(port_priv, wc);
      }
}

/*
 * IB MAD completion callback
 */
static void ib_mad_completion_handler(void *data)
{
      struct ib_mad_port_private *port_priv;
      struct ib_wc wc;

      port_priv = (struct ib_mad_port_private *)data;
      ib_req_notify_cq(port_priv->cq, IB_CQ_NEXT_COMP);

      while (ib_poll_cq(port_priv->cq, 1, &wc) == 1) {
            if (wc.status == IB_WC_SUCCESS) {
                  switch (wc.opcode) {
                  case IB_WC_SEND:
                        ib_mad_send_done_handler(port_priv, &wc);
                        break;
                  case IB_WC_RECV:
                        ib_mad_recv_done_handler(port_priv, &wc);
                        break;
                  default:
                        BUG_ON(1);
                        break;
                  }
            } else
                  mad_error_handler(port_priv, &wc);
      }
}

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);
      /* Empty local completion list as well */
      list_splice_init(&mad_agent_priv->local_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);
            atomic_dec(&mad_agent_priv->refcount);
      }
}

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_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_agent *mad_agent,
              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;

      mad_agent_priv = container_of(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);

void ib_cancel_mad(struct ib_mad_agent *mad_agent,
               struct ib_mad_send_buf *send_buf)
{
      ib_modify_mad(mad_agent, send_buf, 0);
}
EXPORT_SYMBOL(ib_cancel_mad);

static void local_completions(void *data)
{
      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 recv = 0;
      struct ib_wc wc;
      struct ib_mad_send_wc mad_send_wc;

      mad_agent_priv = (struct ib_mad_agent_private *)data;

      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);
            if (local->mad_priv) {
                  recv_mad_agent = local->recv_mad_agent;
                  if (!recv_mad_agent) {
                        printk(KERN_ERR PFX "No receive MAD agent for local completion\n");
                        goto local_send_completion;
                  }

                  recv = 1;
                  /*
                   * Defined behavior is to complete response
                   * before request
                   */
                  build_smp_wc((unsigned long) local->mad_send_wr,
                             be16_to_cpu(IB_LID_PERMISSIVE),
                             0, recv_mad_agent->agent.port_num, &wc);

                  local->mad_priv->header.recv_wc.wc = &wc;
                  local->mad_priv->header.recv_wc.mad_len =
                                    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 =
                                    &local->mad_priv->mad.mad;
                  if (atomic_read(&recv_mad_agent->qp_info->snoop_count))
                        snoop_recv(recv_mad_agent->qp_info,
                                &local->mad_priv->header.recv_wc,
                                 IB_MAD_SNOOP_RECVS);
                  recv_mad_agent->agent.recv_handler(
                                    &recv_mad_agent->agent,
                                    &local->mad_priv->header.recv_wc);
                  spin_lock_irqsave(&recv_mad_agent->lock, flags);
                  atomic_dec(&recv_mad_agent->refcount);
                  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;
            if (atomic_read(&mad_agent_priv->qp_info->snoop_count))
                  snoop_send(mad_agent_priv->qp_info,
                           &local->mad_send_wr->send_buf,
                           &mad_send_wc, IB_MAD_SNOOP_SEND_COMPLETIONS);
            mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
                                       &mad_send_wc);

            spin_lock_irqsave(&mad_agent_priv->lock, flags);
            atomic_dec(&mad_agent_priv->refcount);
            if (!recv)
                  kmem_cache_free(ib_mad_cache, 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--)
            return -ETIMEDOUT;

      mad_send_wr->timeout = msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);

      if (mad_send_wr->mad_agent_priv->agent.rmpp_version) {
            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(void *data)
{
      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 = (struct ib_mad_agent_private *)data;
      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);

            atomic_dec(&mad_agent_priv->refcount);
            spin_lock_irqsave(&mad_agent_priv->lock, flags);
      }
      spin_unlock_irqrestore(&mad_agent_priv->lock, flags);
}

static void ib_mad_thread_completion_handler(struct ib_cq *cq, void *arg)
{
      struct ib_mad_port_private *port_priv = cq->cq_context;
      unsigned long flags;

      spin_lock_irqsave(&ib_mad_port_list_lock, flags);
      if (!list_empty(&port_priv->port_list))
            queue_work(port_priv->wq, &port_priv->work);
      spin_unlock_irqrestore(&ib_mad_port_list_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, *bad_recv_wr;
      struct ib_mad_queue *recv_queue = &qp_info->recv_queue;

      /* Initialize common scatter list fields */
      sg_list.length = sizeof *mad_priv - sizeof mad_priv->header;
      sg_list.lkey = (*qp_info->port_priv->mr).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 = kmem_cache_alloc(ib_mad_cache, GFP_KERNEL);
                  if (!mad_priv) {
                        printk(KERN_ERR PFX "No memory for receive buffer\n");
                        ret = -ENOMEM;
                        break;
                  }
            }
            sg_list.addr = dma_map_single(qp_info->port_priv->
                                          device->dma_device,
                                    &mad_priv->grh,
                                    sizeof *mad_priv -
                                          sizeof mad_priv->header,
                                    DMA_FROM_DEVICE);
            pci_unmap_addr_set(&mad_priv->header, mapping, sg_list.addr);
            recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list;
            mad_priv->header.mad_list.mad_queue = recv_queue;

            /* 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, &bad_recv_wr);
            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);
                  dma_unmap_single(qp_info->port_priv->device->dma_device,
                               pci_unmap_addr(&mad_priv->header,
                                          mapping),
                               sizeof *mad_priv -
                                 sizeof mad_priv->header,
                               DMA_FROM_DEVICE);
                  kmem_cache_free(ib_mad_cache, mad_priv);
                  printk(KERN_ERR PFX "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;

      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);

            dma_unmap_single(qp_info->port_priv->device->dma_device,
                         pci_unmap_addr(&recv->header, mapping),
                         sizeof(struct ib_mad_private) -
                         sizeof(struct ib_mad_private_header),
                         DMA_FROM_DEVICE);
            kmem_cache_free(ib_mad_cache, 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;

      attr = kmalloc(sizeof *attr, GFP_KERNEL);
      if (!attr) {
            printk(KERN_ERR PFX "Couldn't kmalloc ib_qp_attr\n");
            return -ENOMEM;
      }

      for (i = 0; i < IB_MAD_QPS_CORE; i++) {
            qp = port_priv->qp_info[i].qp;
            /*
             * 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 = 0;
            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) {
                  printk(KERN_ERR PFX "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) {
                  printk(KERN_ERR PFX "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) {
                  printk(KERN_ERR PFX "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) {
            printk(KERN_ERR PFX "Failed to request completion "
                   "notification: %d\n", ret);
            goto out;
      }

      for (i = 0; i < IB_MAD_QPS_CORE; i++) {
            ret = ib_mad_post_receive_mads(&port_priv->qp_info[i], NULL);
            if (ret) {
                  printk(KERN_ERR PFX "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! */
      printk(KERN_ERR PFX "Fatal error (%d) on MAD QP (%d)\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);
      spin_lock_init(&qp_info->snoop_lock);
      qp_info->snoop_table = NULL;
      qp_info->snoop_table_size = 0;
      atomic_set(&qp_info->snoop_count, 0);
}

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 = IB_MAD_QP_SEND_SIZE;
      qp_init_attr.cap.max_recv_wr = IB_MAD_QP_RECV_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)) {
            printk(KERN_ERR PFX "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 = IB_MAD_QP_SEND_SIZE;
      qp_info->recv_queue.max_active = IB_MAD_QP_RECV_SIZE;
      return 0;

error:
      return ret;
}

static void destroy_mad_qp(struct ib_mad_qp_info *qp_info)
{
      ib_destroy_qp(qp_info->qp);
      kfree(qp_info->snoop_table);
}

/*
 * Open the port
 * Create the QP, PD, MR, and CQ if needed
 */
static int ib_mad_port_open(struct ib_device *device,
                      int port_num)
{
      int ret, cq_size;
      struct ib_mad_port_private *port_priv;
      unsigned long flags;
      char name[sizeof "ib_mad123"];

      /* Create new device info */
      port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
      if (!port_priv) {
            printk(KERN_ERR PFX "No memory for ib_mad_port_private\n");
            return -ENOMEM;
      }

      port_priv->device = device;
      port_priv->port_num = port_num;
      spin_lock_init(&port_priv->reg_lock);
      INIT_LIST_HEAD(&port_priv->agent_list);
      init_mad_qp(port_priv, &port_priv->qp_info[0]);
      init_mad_qp(port_priv, &port_priv->qp_info[1]);

      cq_size = (IB_MAD_QP_SEND_SIZE + IB_MAD_QP_RECV_SIZE) * 2;
      port_priv->cq = ib_create_cq(port_priv->device,
                             ib_mad_thread_completion_handler,
                             NULL, port_priv, cq_size);
      if (IS_ERR(port_priv->cq)) {
            printk(KERN_ERR PFX "Couldn't create ib_mad CQ\n");
            ret = PTR_ERR(port_priv->cq);
            goto error3;
      }

      port_priv->pd = ib_alloc_pd(device);
      if (IS_ERR(port_priv->pd)) {
            printk(KERN_ERR PFX "Couldn't create ib_mad PD\n");
            ret = PTR_ERR(port_priv->pd);
            goto error4;
      }

      port_priv->mr = ib_get_dma_mr(port_priv->pd, IB_ACCESS_LOCAL_WRITE);
      if (IS_ERR(port_priv->mr)) {
            printk(KERN_ERR PFX "Couldn't get ib_mad DMA MR\n");
            ret = PTR_ERR(port_priv->mr);
            goto error5;
      }

      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%d", port_num);
      port_priv->wq = create_singlethread_workqueue(name);
      if (!port_priv->wq) {
            ret = -ENOMEM;
            goto error8;
      }
      INIT_WORK(&port_priv->work, ib_mad_completion_handler, port_priv);

      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) {
            printk(KERN_ERR PFX "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_dereg_mr(port_priv->mr);
error5:
      ib_dealloc_pd(port_priv->pd);
error4:
      ib_destroy_cq(port_priv->cq);
      cleanup_recv_queue(&port_priv->qp_info[1]);
      cleanup_recv_queue(&port_priv->qp_info[0]);
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, int 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);
            printk(KERN_ERR PFX "Port %d 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_dereg_mr(port_priv->mr);
      ib_dealloc_pd(port_priv->pd);
      ib_destroy_cq(port_priv->cq);
      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 void ib_mad_init_device(struct ib_device *device)
{
      int start, end, i;

      if (device->node_type == IB_NODE_SWITCH) {
            start = 0;
            end   = 0;
      } else {
            start = 1;
            end   = device->phys_port_cnt;
      }

      for (i = start; i <= end; i++) {
            if (ib_mad_port_open(device, i)) {
                  printk(KERN_ERR PFX "Couldn't open %s port %d\n",
                         device->name, i);
                  goto error;
            }
            if (ib_agent_port_open(device, i)) {
                  printk(KERN_ERR PFX "Couldn't open %s port %d "
                         "for agents\n",
                         device->name, i);
                  goto error_agent;
            }
      }
      return;

error_agent:
      if (ib_mad_port_close(device, i))
            printk(KERN_ERR PFX "Couldn't close %s port %d\n",
                   device->name, i);

error:
      i--;

      while (i >= start) {
            if (ib_agent_port_close(device, i))
                  printk(KERN_ERR PFX "Couldn't close %s port %d "
                         "for agents\n",
                         device->name, i);
            if (ib_mad_port_close(device, i))
                  printk(KERN_ERR PFX "Couldn't close %s port %d\n",
                         device->name, i);
            i--;
      }
}

static void ib_mad_remove_device(struct ib_device *device)
{
      int i, num_ports, cur_port;

      if (device->node_type == IB_NODE_SWITCH) {
            num_ports = 1;
            cur_port = 0;
      } else {
            num_ports = device->phys_port_cnt;
            cur_port = 1;
      }
      for (i = 0; i < num_ports; i++, cur_port++) {
            if (ib_agent_port_close(device, cur_port))
                  printk(KERN_ERR PFX "Couldn't close %s port %d "
                         "for agents\n",
                         device->name, cur_port);
            if (ib_mad_port_close(device, cur_port))
                  printk(KERN_ERR PFX "Couldn't close %s port %d\n",
                         device->name, cur_port);
      }
}

static struct ib_client mad_client = {
      .name   = "mad",
      .add = ib_mad_init_device,
      .remove = ib_mad_remove_device
};

static int __init ib_mad_init_module(void)
{
      int ret;

      spin_lock_init(&ib_mad_port_list_lock);

      ib_mad_cache = kmem_cache_create("ib_mad",
                               sizeof(struct ib_mad_private),
                               0,
                               SLAB_HWCACHE_ALIGN,
                               NULL,
                               NULL);
      if (!ib_mad_cache) {
            printk(KERN_ERR PFX "Couldn't create ib_mad cache\n");
            ret = -ENOMEM;
            goto error1;
      }

      INIT_LIST_HEAD(&ib_mad_port_list);

      if (ib_register_client(&mad_client)) {
            printk(KERN_ERR PFX "Couldn't register ib_mad client\n");
            ret = -EINVAL;
            goto error2;
      }

      return 0;

error2:
      kmem_cache_destroy(ib_mad_cache);
error1:
      return ret;
}

static void __exit ib_mad_cleanup_module(void)
{
      ib_unregister_client(&mad_client);

      if (kmem_cache_destroy(ib_mad_cache)) {
            printk(KERN_DEBUG PFX "Failed to destroy ib_mad cache\n");
      }
}

module_init(ib_mad_init_module);
module_exit(ib_mad_cleanup_module);


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