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sa_query.c

/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Voltaire, Inc.  All rights reserved.
 * Copyright (c) 2006 Intel Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: sa_query.c 2811 2005-07-06 18:11:43Z halr $
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/random.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/kref.h>
#include <linux/idr.h>
#include <linux/workqueue.h>

#include <rdma/ib_pack.h>
#include <rdma/ib_cache.h>
#include "sa.h"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand subnet administration query support");
MODULE_LICENSE("Dual BSD/GPL");

struct ib_sa_sm_ah {
      struct ib_ah        *ah;
      struct kref          ref;
      u16              pkey_index;
      u8               src_path_mask;
};

struct ib_sa_port {
      struct ib_mad_agent *agent;
      struct ib_sa_sm_ah  *sm_ah;
      struct work_struct   update_task;
      spinlock_t           ah_lock;
      u8                   port_num;
};

struct ib_sa_device {
      int                     start_port, end_port;
      struct ib_event_handler event_handler;
      struct ib_sa_port port[0];
};

struct ib_sa_query {
      void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
      void (*release)(struct ib_sa_query *);
      struct ib_sa_client    *client;
      struct ib_sa_port      *port;
      struct ib_mad_send_buf *mad_buf;
      struct ib_sa_sm_ah     *sm_ah;
      int               id;
};

struct ib_sa_service_query {
      void (*callback)(int, struct ib_sa_service_rec *, void *);
      void *context;
      struct ib_sa_query sa_query;
};

struct ib_sa_path_query {
      void (*callback)(int, struct ib_sa_path_rec *, void *);
      void *context;
      struct ib_sa_query sa_query;
};

struct ib_sa_mcmember_query {
      void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
      void *context;
      struct ib_sa_query sa_query;
};

static void ib_sa_add_one(struct ib_device *device);
static void ib_sa_remove_one(struct ib_device *device);

static struct ib_client sa_client = {
      .name   = "sa",
      .add    = ib_sa_add_one,
      .remove = ib_sa_remove_one
};

static spinlock_t idr_lock;
static DEFINE_IDR(query_idr);

static spinlock_t tid_lock;
static u32 tid;

#define PATH_REC_FIELD(field) \
      .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field),          \
      .struct_size_bytes   = sizeof ((struct ib_sa_path_rec *) 0)->field,     \
      .field_name          = "sa_path_rec:" #field

static const struct ib_field path_rec_table[] = {
      { PATH_REC_FIELD(service_id),
        .offset_words = 0,
        .offset_bits  = 0,
        .size_bits    = 64 },
      { PATH_REC_FIELD(dgid),
        .offset_words = 2,
        .offset_bits  = 0,
        .size_bits    = 128 },
      { PATH_REC_FIELD(sgid),
        .offset_words = 6,
        .offset_bits  = 0,
        .size_bits    = 128 },
      { PATH_REC_FIELD(dlid),
        .offset_words = 10,
        .offset_bits  = 0,
        .size_bits    = 16 },
      { PATH_REC_FIELD(slid),
        .offset_words = 10,
        .offset_bits  = 16,
        .size_bits    = 16 },
      { PATH_REC_FIELD(raw_traffic),
        .offset_words = 11,
        .offset_bits  = 0,
        .size_bits    = 1 },
      { RESERVED,
        .offset_words = 11,
        .offset_bits  = 1,
        .size_bits    = 3 },
      { PATH_REC_FIELD(flow_label),
        .offset_words = 11,
        .offset_bits  = 4,
        .size_bits    = 20 },
      { PATH_REC_FIELD(hop_limit),
        .offset_words = 11,
        .offset_bits  = 24,
        .size_bits    = 8 },
      { PATH_REC_FIELD(traffic_class),
        .offset_words = 12,
        .offset_bits  = 0,
        .size_bits    = 8 },
      { PATH_REC_FIELD(reversible),
        .offset_words = 12,
        .offset_bits  = 8,
        .size_bits    = 1 },
      { PATH_REC_FIELD(numb_path),
        .offset_words = 12,
        .offset_bits  = 9,
        .size_bits    = 7 },
      { PATH_REC_FIELD(pkey),
        .offset_words = 12,
        .offset_bits  = 16,
        .size_bits    = 16 },
      { PATH_REC_FIELD(qos_class),
        .offset_words = 13,
        .offset_bits  = 0,
        .size_bits    = 12 },
      { PATH_REC_FIELD(sl),
        .offset_words = 13,
        .offset_bits  = 12,
        .size_bits    = 4 },
      { PATH_REC_FIELD(mtu_selector),
        .offset_words = 13,
        .offset_bits  = 16,
        .size_bits    = 2 },
      { PATH_REC_FIELD(mtu),
        .offset_words = 13,
        .offset_bits  = 18,
        .size_bits    = 6 },
      { PATH_REC_FIELD(rate_selector),
        .offset_words = 13,
        .offset_bits  = 24,
        .size_bits    = 2 },
      { PATH_REC_FIELD(rate),
        .offset_words = 13,
        .offset_bits  = 26,
        .size_bits    = 6 },
      { PATH_REC_FIELD(packet_life_time_selector),
        .offset_words = 14,
        .offset_bits  = 0,
        .size_bits    = 2 },
      { PATH_REC_FIELD(packet_life_time),
        .offset_words = 14,
        .offset_bits  = 2,
        .size_bits    = 6 },
      { PATH_REC_FIELD(preference),
        .offset_words = 14,
        .offset_bits  = 8,
        .size_bits    = 8 },
      { RESERVED,
        .offset_words = 14,
        .offset_bits  = 16,
        .size_bits    = 48 },
};

#define MCMEMBER_REC_FIELD(field) \
      .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),      \
      .struct_size_bytes   = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
      .field_name          = "sa_mcmember_rec:" #field

static const struct ib_field mcmember_rec_table[] = {
      { MCMEMBER_REC_FIELD(mgid),
        .offset_words = 0,
        .offset_bits  = 0,
        .size_bits    = 128 },
      { MCMEMBER_REC_FIELD(port_gid),
        .offset_words = 4,
        .offset_bits  = 0,
        .size_bits    = 128 },
      { MCMEMBER_REC_FIELD(qkey),
        .offset_words = 8,
        .offset_bits  = 0,
        .size_bits    = 32 },
      { MCMEMBER_REC_FIELD(mlid),
        .offset_words = 9,
        .offset_bits  = 0,
        .size_bits    = 16 },
      { MCMEMBER_REC_FIELD(mtu_selector),
        .offset_words = 9,
        .offset_bits  = 16,
        .size_bits    = 2 },
      { MCMEMBER_REC_FIELD(mtu),
        .offset_words = 9,
        .offset_bits  = 18,
        .size_bits    = 6 },
      { MCMEMBER_REC_FIELD(traffic_class),
        .offset_words = 9,
        .offset_bits  = 24,
        .size_bits    = 8 },
      { MCMEMBER_REC_FIELD(pkey),
        .offset_words = 10,
        .offset_bits  = 0,
        .size_bits    = 16 },
      { MCMEMBER_REC_FIELD(rate_selector),
        .offset_words = 10,
        .offset_bits  = 16,
        .size_bits    = 2 },
      { MCMEMBER_REC_FIELD(rate),
        .offset_words = 10,
        .offset_bits  = 18,
        .size_bits    = 6 },
      { MCMEMBER_REC_FIELD(packet_life_time_selector),
        .offset_words = 10,
        .offset_bits  = 24,
        .size_bits    = 2 },
      { MCMEMBER_REC_FIELD(packet_life_time),
        .offset_words = 10,
        .offset_bits  = 26,
        .size_bits    = 6 },
      { MCMEMBER_REC_FIELD(sl),
        .offset_words = 11,
        .offset_bits  = 0,
        .size_bits    = 4 },
      { MCMEMBER_REC_FIELD(flow_label),
        .offset_words = 11,
        .offset_bits  = 4,
        .size_bits    = 20 },
      { MCMEMBER_REC_FIELD(hop_limit),
        .offset_words = 11,
        .offset_bits  = 24,
        .size_bits    = 8 },
      { MCMEMBER_REC_FIELD(scope),
        .offset_words = 12,
        .offset_bits  = 0,
        .size_bits    = 4 },
      { MCMEMBER_REC_FIELD(join_state),
        .offset_words = 12,
        .offset_bits  = 4,
        .size_bits    = 4 },
      { MCMEMBER_REC_FIELD(proxy_join),
        .offset_words = 12,
        .offset_bits  = 8,
        .size_bits    = 1 },
      { RESERVED,
        .offset_words = 12,
        .offset_bits  = 9,
        .size_bits    = 23 },
};

#define SERVICE_REC_FIELD(field) \
      .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
      .struct_size_bytes   = sizeof ((struct ib_sa_service_rec *) 0)->field,  \
      .field_name          = "sa_service_rec:" #field

static const struct ib_field service_rec_table[] = {
      { SERVICE_REC_FIELD(id),
        .offset_words = 0,
        .offset_bits  = 0,
        .size_bits    = 64 },
      { SERVICE_REC_FIELD(gid),
        .offset_words = 2,
        .offset_bits  = 0,
        .size_bits    = 128 },
      { SERVICE_REC_FIELD(pkey),
        .offset_words = 6,
        .offset_bits  = 0,
        .size_bits    = 16 },
      { SERVICE_REC_FIELD(lease),
        .offset_words = 7,
        .offset_bits  = 0,
        .size_bits    = 32 },
      { SERVICE_REC_FIELD(key),
        .offset_words = 8,
        .offset_bits  = 0,
        .size_bits    = 128 },
      { SERVICE_REC_FIELD(name),
        .offset_words = 12,
        .offset_bits  = 0,
        .size_bits    = 64*8 },
      { SERVICE_REC_FIELD(data8),
        .offset_words = 28,
        .offset_bits  = 0,
        .size_bits    = 16*8 },
      { SERVICE_REC_FIELD(data16),
        .offset_words = 32,
        .offset_bits  = 0,
        .size_bits    = 8*16 },
      { SERVICE_REC_FIELD(data32),
        .offset_words = 36,
        .offset_bits  = 0,
        .size_bits    = 4*32 },
      { SERVICE_REC_FIELD(data64),
        .offset_words = 40,
        .offset_bits  = 0,
        .size_bits    = 2*64 },
};

static void free_sm_ah(struct kref *kref)
{
      struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);

      ib_destroy_ah(sm_ah->ah);
      kfree(sm_ah);
}

static void update_sm_ah(struct work_struct *work)
{
      struct ib_sa_port *port =
            container_of(work, struct ib_sa_port, update_task);
      struct ib_sa_sm_ah *new_ah, *old_ah;
      struct ib_port_attr port_attr;
      struct ib_ah_attr   ah_attr;

      if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
            printk(KERN_WARNING "Couldn't query port\n");
            return;
      }

      new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
      if (!new_ah) {
            printk(KERN_WARNING "Couldn't allocate new SM AH\n");
            return;
      }

      kref_init(&new_ah->ref);
      new_ah->src_path_mask = (1 << port_attr.lmc) - 1;

      new_ah->pkey_index = 0;
      if (ib_find_pkey(port->agent->device, port->port_num,
                   IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
            printk(KERN_ERR "Couldn't find index for default PKey\n");

      memset(&ah_attr, 0, sizeof ah_attr);
      ah_attr.dlid     = port_attr.sm_lid;
      ah_attr.sl       = port_attr.sm_sl;
      ah_attr.port_num = port->port_num;

      new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
      if (IS_ERR(new_ah->ah)) {
            printk(KERN_WARNING "Couldn't create new SM AH\n");
            kfree(new_ah);
            return;
      }

      spin_lock_irq(&port->ah_lock);
      old_ah = port->sm_ah;
      port->sm_ah = new_ah;
      spin_unlock_irq(&port->ah_lock);

      if (old_ah)
            kref_put(&old_ah->ref, free_sm_ah);
}

static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
{
      if (event->event == IB_EVENT_PORT_ERR    ||
          event->event == IB_EVENT_PORT_ACTIVE ||
          event->event == IB_EVENT_LID_CHANGE  ||
          event->event == IB_EVENT_PKEY_CHANGE ||
          event->event == IB_EVENT_SM_CHANGE   ||
          event->event == IB_EVENT_CLIENT_REREGISTER) {
            struct ib_sa_device *sa_dev;
            sa_dev = container_of(handler, typeof(*sa_dev), event_handler);

            schedule_work(&sa_dev->port[event->element.port_num -
                                  sa_dev->start_port].update_task);
      }
}

void ib_sa_register_client(struct ib_sa_client *client)
{
      atomic_set(&client->users, 1);
      init_completion(&client->comp);
}
EXPORT_SYMBOL(ib_sa_register_client);

void ib_sa_unregister_client(struct ib_sa_client *client)
{
      ib_sa_client_put(client);
      wait_for_completion(&client->comp);
}
EXPORT_SYMBOL(ib_sa_unregister_client);

/**
 * ib_sa_cancel_query - try to cancel an SA query
 * @id:ID of query to cancel
 * @query:query pointer to cancel
 *
 * Try to cancel an SA query.  If the id and query don't match up or
 * the query has already completed, nothing is done.  Otherwise the
 * query is canceled and will complete with a status of -EINTR.
 */
void ib_sa_cancel_query(int id, struct ib_sa_query *query)
{
      unsigned long flags;
      struct ib_mad_agent *agent;
      struct ib_mad_send_buf *mad_buf;

      spin_lock_irqsave(&idr_lock, flags);
      if (idr_find(&query_idr, id) != query) {
            spin_unlock_irqrestore(&idr_lock, flags);
            return;
      }
      agent = query->port->agent;
      mad_buf = query->mad_buf;
      spin_unlock_irqrestore(&idr_lock, flags);

      ib_cancel_mad(agent, mad_buf);
}
EXPORT_SYMBOL(ib_sa_cancel_query);

static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
{
      struct ib_sa_device *sa_dev;
      struct ib_sa_port   *port;
      unsigned long flags;
      u8 src_path_mask;

      sa_dev = ib_get_client_data(device, &sa_client);
      if (!sa_dev)
            return 0x7f;

      port  = &sa_dev->port[port_num - sa_dev->start_port];
      spin_lock_irqsave(&port->ah_lock, flags);
      src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
      spin_unlock_irqrestore(&port->ah_lock, flags);

      return src_path_mask;
}

int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
                   struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
{
      int ret;
      u16 gid_index;

      memset(ah_attr, 0, sizeof *ah_attr);
      ah_attr->dlid = be16_to_cpu(rec->dlid);
      ah_attr->sl = rec->sl;
      ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
                         get_src_path_mask(device, port_num);
      ah_attr->port_num = port_num;
      ah_attr->static_rate = rec->rate;

      if (rec->hop_limit > 1) {
            ah_attr->ah_flags = IB_AH_GRH;
            ah_attr->grh.dgid = rec->dgid;

            ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
                               &gid_index);
            if (ret)
                  return ret;

            ah_attr->grh.sgid_index    = gid_index;
            ah_attr->grh.flow_label    = be32_to_cpu(rec->flow_label);
            ah_attr->grh.hop_limit     = rec->hop_limit;
            ah_attr->grh.traffic_class = rec->traffic_class;
      }
      return 0;
}
EXPORT_SYMBOL(ib_init_ah_from_path);

static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
{
      unsigned long flags;

      spin_lock_irqsave(&query->port->ah_lock, flags);
      kref_get(&query->port->sm_ah->ref);
      query->sm_ah = query->port->sm_ah;
      spin_unlock_irqrestore(&query->port->ah_lock, flags);

      query->mad_buf = ib_create_send_mad(query->port->agent, 1,
                                  query->sm_ah->pkey_index,
                                  0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
                                  gfp_mask);
      if (IS_ERR(query->mad_buf)) {
            kref_put(&query->sm_ah->ref, free_sm_ah);
            return -ENOMEM;
      }

      query->mad_buf->ah = query->sm_ah->ah;

      return 0;
}

static void free_mad(struct ib_sa_query *query)
{
      ib_free_send_mad(query->mad_buf);
      kref_put(&query->sm_ah->ref, free_sm_ah);
}

static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
{
      unsigned long flags;

      memset(mad, 0, sizeof *mad);

      mad->mad_hdr.base_version  = IB_MGMT_BASE_VERSION;
      mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_SUBN_ADM;
      mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;

      spin_lock_irqsave(&tid_lock, flags);
      mad->mad_hdr.tid           =
            cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
      spin_unlock_irqrestore(&tid_lock, flags);
}

static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
{
      unsigned long flags;
      int ret, id;

retry:
      if (!idr_pre_get(&query_idr, gfp_mask))
            return -ENOMEM;
      spin_lock_irqsave(&idr_lock, flags);
      ret = idr_get_new(&query_idr, query, &id);
      spin_unlock_irqrestore(&idr_lock, flags);
      if (ret == -EAGAIN)
            goto retry;
      if (ret)
            return ret;

      query->mad_buf->timeout_ms  = timeout_ms;
      query->mad_buf->context[0] = query;
      query->id = id;

      ret = ib_post_send_mad(query->mad_buf, NULL);
      if (ret) {
            spin_lock_irqsave(&idr_lock, flags);
            idr_remove(&query_idr, id);
            spin_unlock_irqrestore(&idr_lock, flags);
      }

      /*
       * It's not safe to dereference query any more, because the
       * send may already have completed and freed the query in
       * another context.
       */
      return ret ? ret : id;
}

static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
                            int status,
                            struct ib_sa_mad *mad)
{
      struct ib_sa_path_query *query =
            container_of(sa_query, struct ib_sa_path_query, sa_query);

      if (mad) {
            struct ib_sa_path_rec rec;

            ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
                    mad->data, &rec);
            query->callback(status, &rec, query->context);
      } else
            query->callback(status, NULL, query->context);
}

static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
{
      kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
}

/**
 * ib_sa_path_rec_get - Start a Path get query
 * @client:SA client
 * @device:device to send query on
 * @port_num: port number to send query on
 * @rec:Path Record to send in query
 * @comp_mask:component mask to send in query
 * @timeout_ms:time to wait for response
 * @gfp_mask:GFP mask to use for internal allocations
 * @callback:function called when query completes, times out or is
 * canceled
 * @context:opaque user context passed to callback
 * @sa_query:query context, used to cancel query
 *
 * Send a Path Record Get query to the SA to look up a path.  The
 * callback function will be called when the query completes (or
 * fails); status is 0 for a successful response, -EINTR if the query
 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
 * occurred sending the query.  The resp parameter of the callback is
 * only valid if status is 0.
 *
 * If the return value of ib_sa_path_rec_get() is negative, it is an
 * error code.  Otherwise it is a query ID that can be used to cancel
 * the query.
 */
int ib_sa_path_rec_get(struct ib_sa_client *client,
                   struct ib_device *device, u8 port_num,
                   struct ib_sa_path_rec *rec,
                   ib_sa_comp_mask comp_mask,
                   int timeout_ms, gfp_t gfp_mask,
                   void (*callback)(int status,
                              struct ib_sa_path_rec *resp,
                              void *context),
                   void *context,
                   struct ib_sa_query **sa_query)
{
      struct ib_sa_path_query *query;
      struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
      struct ib_sa_port   *port;
      struct ib_mad_agent *agent;
      struct ib_sa_mad *mad;
      int ret;

      if (!sa_dev)
            return -ENODEV;

      port  = &sa_dev->port[port_num - sa_dev->start_port];
      agent = port->agent;

      query = kmalloc(sizeof *query, gfp_mask);
      if (!query)
            return -ENOMEM;

      query->sa_query.port     = port;
      ret = alloc_mad(&query->sa_query, gfp_mask);
      if (ret)
            goto err1;

      ib_sa_client_get(client);
      query->sa_query.client = client;
      query->callback        = callback;
      query->context         = context;

      mad = query->sa_query.mad_buf->mad;
      init_mad(mad, agent);

      query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
      query->sa_query.release  = ib_sa_path_rec_release;
      mad->mad_hdr.method      = IB_MGMT_METHOD_GET;
      mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_PATH_REC);
      mad->sa_hdr.comp_mask    = comp_mask;

      ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);

      *sa_query = &query->sa_query;

      ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
      if (ret < 0)
            goto err2;

      return ret;

err2:
      *sa_query = NULL;
      ib_sa_client_put(query->sa_query.client);
      free_mad(&query->sa_query);

err1:
      kfree(query);
      return ret;
}
EXPORT_SYMBOL(ib_sa_path_rec_get);

static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
                            int status,
                            struct ib_sa_mad *mad)
{
      struct ib_sa_service_query *query =
            container_of(sa_query, struct ib_sa_service_query, sa_query);

      if (mad) {
            struct ib_sa_service_rec rec;

            ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
                    mad->data, &rec);
            query->callback(status, &rec, query->context);
      } else
            query->callback(status, NULL, query->context);
}

static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
{
      kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
}

/**
 * ib_sa_service_rec_query - Start Service Record operation
 * @client:SA client
 * @device:device to send request on
 * @port_num: port number to send request on
 * @method:SA method - should be get, set, or delete
 * @rec:Service Record to send in request
 * @comp_mask:component mask to send in request
 * @timeout_ms:time to wait for response
 * @gfp_mask:GFP mask to use for internal allocations
 * @callback:function called when request completes, times out or is
 * canceled
 * @context:opaque user context passed to callback
 * @sa_query:request context, used to cancel request
 *
 * Send a Service Record set/get/delete to the SA to register,
 * unregister or query a service record.
 * The callback function will be called when the request completes (or
 * fails); status is 0 for a successful response, -EINTR if the query
 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
 * occurred sending the query.  The resp parameter of the callback is
 * only valid if status is 0.
 *
 * If the return value of ib_sa_service_rec_query() is negative, it is an
 * error code.  Otherwise it is a request ID that can be used to cancel
 * the query.
 */
int ib_sa_service_rec_query(struct ib_sa_client *client,
                      struct ib_device *device, u8 port_num, u8 method,
                      struct ib_sa_service_rec *rec,
                      ib_sa_comp_mask comp_mask,
                      int timeout_ms, gfp_t gfp_mask,
                      void (*callback)(int status,
                                   struct ib_sa_service_rec *resp,
                                   void *context),
                      void *context,
                      struct ib_sa_query **sa_query)
{
      struct ib_sa_service_query *query;
      struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
      struct ib_sa_port   *port;
      struct ib_mad_agent *agent;
      struct ib_sa_mad *mad;
      int ret;

      if (!sa_dev)
            return -ENODEV;

      port  = &sa_dev->port[port_num - sa_dev->start_port];
      agent = port->agent;

      if (method != IB_MGMT_METHOD_GET &&
          method != IB_MGMT_METHOD_SET &&
          method != IB_SA_METHOD_DELETE)
            return -EINVAL;

      query = kmalloc(sizeof *query, gfp_mask);
      if (!query)
            return -ENOMEM;

      query->sa_query.port     = port;
      ret = alloc_mad(&query->sa_query, gfp_mask);
      if (ret)
            goto err1;

      ib_sa_client_get(client);
      query->sa_query.client = client;
      query->callback        = callback;
      query->context         = context;

      mad = query->sa_query.mad_buf->mad;
      init_mad(mad, agent);

      query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
      query->sa_query.release  = ib_sa_service_rec_release;
      mad->mad_hdr.method      = method;
      mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
      mad->sa_hdr.comp_mask    = comp_mask;

      ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
            rec, mad->data);

      *sa_query = &query->sa_query;

      ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
      if (ret < 0)
            goto err2;

      return ret;

err2:
      *sa_query = NULL;
      ib_sa_client_put(query->sa_query.client);
      free_mad(&query->sa_query);

err1:
      kfree(query);
      return ret;
}
EXPORT_SYMBOL(ib_sa_service_rec_query);

static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
                              int status,
                              struct ib_sa_mad *mad)
{
      struct ib_sa_mcmember_query *query =
            container_of(sa_query, struct ib_sa_mcmember_query, sa_query);

      if (mad) {
            struct ib_sa_mcmember_rec rec;

            ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
                    mad->data, &rec);
            query->callback(status, &rec, query->context);
      } else
            query->callback(status, NULL, query->context);
}

static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
{
      kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
}

int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
                       struct ib_device *device, u8 port_num,
                       u8 method,
                       struct ib_sa_mcmember_rec *rec,
                       ib_sa_comp_mask comp_mask,
                       int timeout_ms, gfp_t gfp_mask,
                       void (*callback)(int status,
                                    struct ib_sa_mcmember_rec *resp,
                                    void *context),
                       void *context,
                       struct ib_sa_query **sa_query)
{
      struct ib_sa_mcmember_query *query;
      struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
      struct ib_sa_port   *port;
      struct ib_mad_agent *agent;
      struct ib_sa_mad *mad;
      int ret;

      if (!sa_dev)
            return -ENODEV;

      port  = &sa_dev->port[port_num - sa_dev->start_port];
      agent = port->agent;

      query = kmalloc(sizeof *query, gfp_mask);
      if (!query)
            return -ENOMEM;

      query->sa_query.port     = port;
      ret = alloc_mad(&query->sa_query, gfp_mask);
      if (ret)
            goto err1;

      ib_sa_client_get(client);
      query->sa_query.client = client;
      query->callback        = callback;
      query->context         = context;

      mad = query->sa_query.mad_buf->mad;
      init_mad(mad, agent);

      query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
      query->sa_query.release  = ib_sa_mcmember_rec_release;
      mad->mad_hdr.method      = method;
      mad->mad_hdr.attr_id     = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
      mad->sa_hdr.comp_mask    = comp_mask;

      ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
            rec, mad->data);

      *sa_query = &query->sa_query;

      ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
      if (ret < 0)
            goto err2;

      return ret;

err2:
      *sa_query = NULL;
      ib_sa_client_put(query->sa_query.client);
      free_mad(&query->sa_query);

err1:
      kfree(query);
      return ret;
}

static void send_handler(struct ib_mad_agent *agent,
                   struct ib_mad_send_wc *mad_send_wc)
{
      struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
      unsigned long flags;

      if (query->callback)
            switch (mad_send_wc->status) {
            case IB_WC_SUCCESS:
                  /* No callback -- already got recv */
                  break;
            case IB_WC_RESP_TIMEOUT_ERR:
                  query->callback(query, -ETIMEDOUT, NULL);
                  break;
            case IB_WC_WR_FLUSH_ERR:
                  query->callback(query, -EINTR, NULL);
                  break;
            default:
                  query->callback(query, -EIO, NULL);
                  break;
            }

      spin_lock_irqsave(&idr_lock, flags);
      idr_remove(&query_idr, query->id);
      spin_unlock_irqrestore(&idr_lock, flags);

      free_mad(query);
      ib_sa_client_put(query->client);
      query->release(query);
}

static void recv_handler(struct ib_mad_agent *mad_agent,
                   struct ib_mad_recv_wc *mad_recv_wc)
{
      struct ib_sa_query *query;
      struct ib_mad_send_buf *mad_buf;

      mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
      query = mad_buf->context[0];

      if (query->callback) {
            if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
                  query->callback(query,
                              mad_recv_wc->recv_buf.mad->mad_hdr.status ?
                              -EINVAL : 0,
                              (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
            else
                  query->callback(query, -EIO, NULL);
      }

      ib_free_recv_mad(mad_recv_wc);
}

static void ib_sa_add_one(struct ib_device *device)
{
      struct ib_sa_device *sa_dev;
      int s, e, i;

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

      if (device->node_type == RDMA_NODE_IB_SWITCH)
            s = e = 0;
      else {
            s = 1;
            e = device->phys_port_cnt;
      }

      sa_dev = kmalloc(sizeof *sa_dev +
                   (e - s + 1) * sizeof (struct ib_sa_port),
                   GFP_KERNEL);
      if (!sa_dev)
            return;

      sa_dev->start_port = s;
      sa_dev->end_port   = e;

      for (i = 0; i <= e - s; ++i) {
            sa_dev->port[i].sm_ah    = NULL;
            sa_dev->port[i].port_num = i + s;
            spin_lock_init(&sa_dev->port[i].ah_lock);

            sa_dev->port[i].agent =
                  ib_register_mad_agent(device, i + s, IB_QPT_GSI,
                                    NULL, 0, send_handler,
                                    recv_handler, sa_dev);
            if (IS_ERR(sa_dev->port[i].agent))
                  goto err;

            INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
      }

      ib_set_client_data(device, &sa_client, sa_dev);

      /*
       * We register our event handler after everything is set up,
       * and then update our cached info after the event handler is
       * registered to avoid any problems if a port changes state
       * during our initialization.
       */

      INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
      if (ib_register_event_handler(&sa_dev->event_handler))
            goto err;

      for (i = 0; i <= e - s; ++i)
            update_sm_ah(&sa_dev->port[i].update_task);

      return;

err:
      while (--i >= 0)
            ib_unregister_mad_agent(sa_dev->port[i].agent);

      kfree(sa_dev);

      return;
}

static void ib_sa_remove_one(struct ib_device *device)
{
      struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
      int i;

      if (!sa_dev)
            return;

      ib_unregister_event_handler(&sa_dev->event_handler);

      flush_scheduled_work();

      for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
            ib_unregister_mad_agent(sa_dev->port[i].agent);
            kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
      }

      kfree(sa_dev);
}

static int __init ib_sa_init(void)
{
      int ret;

      spin_lock_init(&idr_lock);
      spin_lock_init(&tid_lock);

      get_random_bytes(&tid, sizeof tid);

      ret = ib_register_client(&sa_client);
      if (ret) {
            printk(KERN_ERR "Couldn't register ib_sa client\n");
            goto err1;
      }

      ret = mcast_init();
      if (ret) {
            printk(KERN_ERR "Couldn't initialize multicast handling\n");
            goto err2;
      }

      return 0;
err2:
      ib_unregister_client(&sa_client);
err1:
      return ret;
}

static void __exit ib_sa_cleanup(void)
{
      mcast_cleanup();
      ib_unregister_client(&sa_client);
      idr_destroy(&query_idr);
}

module_init(ib_sa_init);
module_exit(ib_sa_cleanup);

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