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ucm.c

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 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: ucm.c 4311 2005-12-05 18:42:01Z sean.hefty $
 */

#include <linux/completion.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/cdev.h>
#include <linux/idr.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>

#include <rdma/ib_cm.h>
#include <rdma/ib_user_cm.h>
#include <rdma/ib_marshall.h>

MODULE_AUTHOR("Libor Michalek");
MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
MODULE_LICENSE("Dual BSD/GPL");

struct ib_ucm_device {
      int               devnum;
      struct cdev       dev;
      struct class_device     class_dev;
      struct ib_device  *ib_dev;
};

struct ib_ucm_file {
      struct mutex file_mutex;
      struct file *filp;
      struct ib_ucm_device *device;

      struct list_head  ctxs;
      struct list_head  events;
      wait_queue_head_t poll_wait;
};

struct ib_ucm_context {
      int                 id;
      struct completion   comp;
      atomic_t            ref;
      int             events_reported;

      struct ib_ucm_file *file;
      struct ib_cm_id    *cm_id;
      __u64          uid;

      struct list_head    events;    /* list of pending events. */
      struct list_head    file_list; /* member in file ctx list */
};

struct ib_ucm_event {
      struct ib_ucm_context *ctx;
      struct list_head file_list; /* member in file event list */
      struct list_head ctx_list;  /* member in ctx event list */

      struct ib_cm_id *cm_id;
      struct ib_ucm_event_resp resp;
      void *data;
      void *info;
      int data_len;
      int info_len;
};

enum {
      IB_UCM_MAJOR = 231,
      IB_UCM_BASE_MINOR = 224,
      IB_UCM_MAX_DEVICES = 32
};

#define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)

static void ib_ucm_add_one(struct ib_device *device);
static void ib_ucm_remove_one(struct ib_device *device);

static struct ib_client ucm_client = {
      .name   = "ucm",
      .add    = ib_ucm_add_one,
      .remove = ib_ucm_remove_one
};

static DEFINE_MUTEX(ctx_id_mutex);
static DEFINE_IDR(ctx_id_table);
static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);

static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
{
      struct ib_ucm_context *ctx;

      mutex_lock(&ctx_id_mutex);
      ctx = idr_find(&ctx_id_table, id);
      if (!ctx)
            ctx = ERR_PTR(-ENOENT);
      else if (ctx->file != file)
            ctx = ERR_PTR(-EINVAL);
      else
            atomic_inc(&ctx->ref);
      mutex_unlock(&ctx_id_mutex);

      return ctx;
}

static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
{
      if (atomic_dec_and_test(&ctx->ref))
            complete(&ctx->comp);
}

static inline int ib_ucm_new_cm_id(int event)
{
      return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
}

static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
{
      struct ib_ucm_event *uevent;

      mutex_lock(&ctx->file->file_mutex);
      list_del(&ctx->file_list);
      while (!list_empty(&ctx->events)) {

            uevent = list_entry(ctx->events.next,
                            struct ib_ucm_event, ctx_list);
            list_del(&uevent->file_list);
            list_del(&uevent->ctx_list);
            mutex_unlock(&ctx->file->file_mutex);

            /* clear incoming connections. */
            if (ib_ucm_new_cm_id(uevent->resp.event))
                  ib_destroy_cm_id(uevent->cm_id);

            kfree(uevent);
            mutex_lock(&ctx->file->file_mutex);
      }
      mutex_unlock(&ctx->file->file_mutex);
}

static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
{
      struct ib_ucm_context *ctx;
      int result;

      ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
      if (!ctx)
            return NULL;

      atomic_set(&ctx->ref, 1);
      init_completion(&ctx->comp);
      ctx->file = file;
      INIT_LIST_HEAD(&ctx->events);

      do {
            result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
            if (!result)
                  goto error;

            mutex_lock(&ctx_id_mutex);
            result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
            mutex_unlock(&ctx_id_mutex);
      } while (result == -EAGAIN);

      if (result)
            goto error;

      list_add_tail(&ctx->file_list, &file->ctxs);
      return ctx;

error:
      kfree(ctx);
      return NULL;
}

static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
                         struct ib_cm_req_event_param *kreq)
{
      ureq->remote_ca_guid             = kreq->remote_ca_guid;
      ureq->remote_qkey                = kreq->remote_qkey;
      ureq->remote_qpn                 = kreq->remote_qpn;
      ureq->qp_type                    = kreq->qp_type;
      ureq->starting_psn               = kreq->starting_psn;
      ureq->responder_resources        = kreq->responder_resources;
      ureq->initiator_depth            = kreq->initiator_depth;
      ureq->local_cm_response_timeout  = kreq->local_cm_response_timeout;
      ureq->flow_control               = kreq->flow_control;
      ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
      ureq->retry_count                = kreq->retry_count;
      ureq->rnr_retry_count            = kreq->rnr_retry_count;
      ureq->srq                        = kreq->srq;
      ureq->port               = kreq->port;

      ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
      if (kreq->alternate_path)
            ib_copy_path_rec_to_user(&ureq->alternate_path,
                               kreq->alternate_path);
}

static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
                         struct ib_cm_rep_event_param *krep)
{
      urep->remote_ca_guid      = krep->remote_ca_guid;
      urep->remote_qkey         = krep->remote_qkey;
      urep->remote_qpn          = krep->remote_qpn;
      urep->starting_psn        = krep->starting_psn;
      urep->responder_resources = krep->responder_resources;
      urep->initiator_depth     = krep->initiator_depth;
      urep->target_ack_delay    = krep->target_ack_delay;
      urep->failover_accepted   = krep->failover_accepted;
      urep->flow_control        = krep->flow_control;
      urep->rnr_retry_count     = krep->rnr_retry_count;
      urep->srq                 = krep->srq;
}

static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
                              struct ib_cm_sidr_rep_event_param *krep)
{
      urep->status = krep->status;
      urep->qkey   = krep->qkey;
      urep->qpn    = krep->qpn;
};

static int ib_ucm_event_process(struct ib_cm_event *evt,
                        struct ib_ucm_event *uvt)
{
      void *info = NULL;

      switch (evt->event) {
      case IB_CM_REQ_RECEIVED:
            ib_ucm_event_req_get(&uvt->resp.u.req_resp,
                             &evt->param.req_rcvd);
            uvt->data_len      = IB_CM_REQ_PRIVATE_DATA_SIZE;
            uvt->resp.present  = IB_UCM_PRES_PRIMARY;
            uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
                              IB_UCM_PRES_ALTERNATE : 0);
            break;
      case IB_CM_REP_RECEIVED:
            ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
                             &evt->param.rep_rcvd);
            uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
            break;
      case IB_CM_RTU_RECEIVED:
            uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
            uvt->resp.u.send_status = evt->param.send_status;
            break;
      case IB_CM_DREQ_RECEIVED:
            uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
            uvt->resp.u.send_status = evt->param.send_status;
            break;
      case IB_CM_DREP_RECEIVED:
            uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
            uvt->resp.u.send_status = evt->param.send_status;
            break;
      case IB_CM_MRA_RECEIVED:
            uvt->resp.u.mra_resp.timeout =
                              evt->param.mra_rcvd.service_timeout;
            uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
            break;
      case IB_CM_REJ_RECEIVED:
            uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
            uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
            uvt->info_len = evt->param.rej_rcvd.ari_length;
            info        = evt->param.rej_rcvd.ari;
            break;
      case IB_CM_LAP_RECEIVED:
            ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
                               evt->param.lap_rcvd.alternate_path);
            uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
            uvt->resp.present = IB_UCM_PRES_ALTERNATE;
            break;
      case IB_CM_APR_RECEIVED:
            uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
            uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
            uvt->info_len = evt->param.apr_rcvd.info_len;
            info        = evt->param.apr_rcvd.apr_info;
            break;
      case IB_CM_SIDR_REQ_RECEIVED:
            uvt->resp.u.sidr_req_resp.pkey =
                              evt->param.sidr_req_rcvd.pkey;
            uvt->resp.u.sidr_req_resp.port =
                              evt->param.sidr_req_rcvd.port;
            uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
            break;
      case IB_CM_SIDR_REP_RECEIVED:
            ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
                                &evt->param.sidr_rep_rcvd);
            uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
            uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
            info        = evt->param.sidr_rep_rcvd.info;
            break;
      default:
            uvt->resp.u.send_status = evt->param.send_status;
            break;
      }

      if (uvt->data_len) {
            uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
            if (!uvt->data)
                  goto err1;

            uvt->resp.present |= IB_UCM_PRES_DATA;
      }

      if (uvt->info_len) {
            uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
            if (!uvt->info)
                  goto err2;

            uvt->resp.present |= IB_UCM_PRES_INFO;
      }
      return 0;

err2:
      kfree(uvt->data);
err1:
      return -ENOMEM;
}

static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
                        struct ib_cm_event *event)
{
      struct ib_ucm_event *uevent;
      struct ib_ucm_context *ctx;
      int result = 0;

      ctx = cm_id->context;

      uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
      if (!uevent)
            goto err1;

      uevent->ctx = ctx;
      uevent->cm_id = cm_id;
      uevent->resp.uid = ctx->uid;
      uevent->resp.id = ctx->id;
      uevent->resp.event = event->event;

      result = ib_ucm_event_process(event, uevent);
      if (result)
            goto err2;

      mutex_lock(&ctx->file->file_mutex);
      list_add_tail(&uevent->file_list, &ctx->file->events);
      list_add_tail(&uevent->ctx_list, &ctx->events);
      wake_up_interruptible(&ctx->file->poll_wait);
      mutex_unlock(&ctx->file->file_mutex);
      return 0;

err2:
      kfree(uevent);
err1:
      /* Destroy new cm_id's */
      return ib_ucm_new_cm_id(event->event);
}

static ssize_t ib_ucm_event(struct ib_ucm_file *file,
                      const char __user *inbuf,
                      int in_len, int out_len)
{
      struct ib_ucm_context *ctx;
      struct ib_ucm_event_get cmd;
      struct ib_ucm_event *uevent;
      int result = 0;
      DEFINE_WAIT(wait);

      if (out_len < sizeof(struct ib_ucm_event_resp))
            return -ENOSPC;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      mutex_lock(&file->file_mutex);
      while (list_empty(&file->events)) {
            mutex_unlock(&file->file_mutex);

            if (file->filp->f_flags & O_NONBLOCK)
                  return -EAGAIN;

            if (wait_event_interruptible(file->poll_wait,
                                   !list_empty(&file->events)))
                  return -ERESTARTSYS;

            mutex_lock(&file->file_mutex);
      }

      uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);

      if (ib_ucm_new_cm_id(uevent->resp.event)) {
            ctx = ib_ucm_ctx_alloc(file);
            if (!ctx) {
                  result = -ENOMEM;
                  goto done;
            }

            ctx->cm_id = uevent->cm_id;
            ctx->cm_id->context = ctx;
            uevent->resp.id = ctx->id;
      }

      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &uevent->resp, sizeof(uevent->resp))) {
            result = -EFAULT;
            goto done;
      }

      if (uevent->data) {
            if (cmd.data_len < uevent->data_len) {
                  result = -ENOMEM;
                  goto done;
            }
            if (copy_to_user((void __user *)(unsigned long)cmd.data,
                         uevent->data, uevent->data_len)) {
                  result = -EFAULT;
                  goto done;
            }
      }

      if (uevent->info) {
            if (cmd.info_len < uevent->info_len) {
                  result = -ENOMEM;
                  goto done;
            }
            if (copy_to_user((void __user *)(unsigned long)cmd.info,
                         uevent->info, uevent->info_len)) {
                  result = -EFAULT;
                  goto done;
            }
      }

      list_del(&uevent->file_list);
      list_del(&uevent->ctx_list);
      uevent->ctx->events_reported++;

      kfree(uevent->data);
      kfree(uevent->info);
      kfree(uevent);
done:
      mutex_unlock(&file->file_mutex);
      return result;
}

static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
                        const char __user *inbuf,
                        int in_len, int out_len)
{
      struct ib_ucm_create_id cmd;
      struct ib_ucm_create_id_resp resp;
      struct ib_ucm_context *ctx;
      int result;

      if (out_len < sizeof(resp))
            return -ENOSPC;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      mutex_lock(&file->file_mutex);
      ctx = ib_ucm_ctx_alloc(file);
      mutex_unlock(&file->file_mutex);
      if (!ctx)
            return -ENOMEM;

      ctx->uid = cmd.uid;
      ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
                             ib_ucm_event_handler, ctx);
      if (IS_ERR(ctx->cm_id)) {
            result = PTR_ERR(ctx->cm_id);
            goto err1;
      }

      resp.id = ctx->id;
      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &resp, sizeof(resp))) {
            result = -EFAULT;
            goto err2;
      }
      return 0;

err2:
      ib_destroy_cm_id(ctx->cm_id);
err1:
      mutex_lock(&ctx_id_mutex);
      idr_remove(&ctx_id_table, ctx->id);
      mutex_unlock(&ctx_id_mutex);
      kfree(ctx);
      return result;
}

static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct ib_ucm_destroy_id cmd;
      struct ib_ucm_destroy_id_resp resp;
      struct ib_ucm_context *ctx;
      int result = 0;

      if (out_len < sizeof(resp))
            return -ENOSPC;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      mutex_lock(&ctx_id_mutex);
      ctx = idr_find(&ctx_id_table, cmd.id);
      if (!ctx)
            ctx = ERR_PTR(-ENOENT);
      else if (ctx->file != file)
            ctx = ERR_PTR(-EINVAL);
      else
            idr_remove(&ctx_id_table, ctx->id);
      mutex_unlock(&ctx_id_mutex);

      if (IS_ERR(ctx))
            return PTR_ERR(ctx);

      ib_ucm_ctx_put(ctx);
      wait_for_completion(&ctx->comp);

      /* No new events will be generated after destroying the cm_id. */
      ib_destroy_cm_id(ctx->cm_id);
      /* Cleanup events not yet reported to the user. */
      ib_ucm_cleanup_events(ctx);

      resp.events_reported = ctx->events_reported;
      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &resp, sizeof(resp)))
            result = -EFAULT;

      kfree(ctx);
      return result;
}

static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
                        const char __user *inbuf,
                        int in_len, int out_len)
{
      struct ib_ucm_attr_id_resp resp;
      struct ib_ucm_attr_id cmd;
      struct ib_ucm_context *ctx;
      int result = 0;

      if (out_len < sizeof(resp))
            return -ENOSPC;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (IS_ERR(ctx))
            return PTR_ERR(ctx);

      resp.service_id   = ctx->cm_id->service_id;
      resp.service_mask = ctx->cm_id->service_mask;
      resp.local_id     = ctx->cm_id->local_id;
      resp.remote_id    = ctx->cm_id->remote_id;

      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &resp, sizeof(resp)))
            result = -EFAULT;

      ib_ucm_ctx_put(ctx);
      return result;
}

static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
                           const char __user *inbuf,
                           int in_len, int out_len)
{
      struct ib_uverbs_qp_attr resp;
      struct ib_ucm_init_qp_attr cmd;
      struct ib_ucm_context *ctx;
      struct ib_qp_attr qp_attr;
      int result = 0;

      if (out_len < sizeof(resp))
            return -ENOSPC;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (IS_ERR(ctx))
            return PTR_ERR(ctx);

      resp.qp_attr_mask = 0;
      memset(&qp_attr, 0, sizeof qp_attr);
      qp_attr.qp_state = cmd.qp_state;
      result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
      if (result)
            goto out;

      ib_copy_qp_attr_to_user(&resp, &qp_attr);

      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &resp, sizeof(resp)))
            result = -EFAULT;

out:
      ib_ucm_ctx_put(ctx);
      return result;
}

static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
{
      service_id &= service_mask;

      if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
          ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
            return -EINVAL;

      return 0;
}

static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
                       const char __user *inbuf,
                       int in_len, int out_len)
{
      struct ib_ucm_listen cmd;
      struct ib_ucm_context *ctx;
      int result;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (IS_ERR(ctx))
            return PTR_ERR(ctx);

      result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
      if (result)
            goto out;

      result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
                        NULL);
out:
      ib_ucm_ctx_put(ctx);
      return result;
}

static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
                       const char __user *inbuf,
                       int in_len, int out_len)
{
      struct ib_ucm_notify cmd;
      struct ib_ucm_context *ctx;
      int result;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (IS_ERR(ctx))
            return PTR_ERR(ctx);

      result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
      ib_ucm_ctx_put(ctx);
      return result;
}

static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
{
      void *data;

      *dest = NULL;

      if (!len)
            return 0;

      data = kmalloc(len, GFP_KERNEL);
      if (!data)
            return -ENOMEM;

      if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
            kfree(data);
            return -EFAULT;
      }

      *dest = data;
      return 0;
}

static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
{
      struct ib_user_path_rec upath;
      struct ib_sa_path_rec  *sa_path;

      *path = NULL;

      if (!src)
            return 0;

      sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
      if (!sa_path)
            return -ENOMEM;

      if (copy_from_user(&upath, (void __user *)(unsigned long)src,
                     sizeof(upath))) {

            kfree(sa_path);
            return -EFAULT;
      }

      ib_copy_path_rec_from_user(sa_path, &upath);
      *path = sa_path;
      return 0;
}

static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct ib_cm_req_param param;
      struct ib_ucm_context *ctx;
      struct ib_ucm_req cmd;
      int result;

      param.private_data   = NULL;
      param.primary_path   = NULL;
      param.alternate_path = NULL;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
      if (result)
            goto done;

      result = ib_ucm_path_get(&param.primary_path, cmd.primary_path);
      if (result)
            goto done;

      result = ib_ucm_path_get(&param.alternate_path, cmd.alternate_path);
      if (result)
            goto done;

      param.private_data_len           = cmd.len;
      param.service_id                 = cmd.sid;
      param.qp_num                     = cmd.qpn;
      param.qp_type                    = cmd.qp_type;
      param.starting_psn               = cmd.psn;
      param.peer_to_peer               = cmd.peer_to_peer;
      param.responder_resources        = cmd.responder_resources;
      param.initiator_depth            = cmd.initiator_depth;
      param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
      param.flow_control               = cmd.flow_control;
      param.local_cm_response_timeout  = cmd.local_cm_response_timeout;
      param.retry_count                = cmd.retry_count;
      param.rnr_retry_count            = cmd.rnr_retry_count;
      param.max_cm_retries             = cmd.max_cm_retries;
      param.srq                        = cmd.srq;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = ib_send_cm_req(ctx->cm_id, &param);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

done:
      kfree(param.private_data);
      kfree(param.primary_path);
      kfree(param.alternate_path);
      return result;
}

static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct ib_cm_rep_param param;
      struct ib_ucm_context *ctx;
      struct ib_ucm_rep cmd;
      int result;

      param.private_data = NULL;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
      if (result)
            return result;

      param.qp_num              = cmd.qpn;
      param.starting_psn        = cmd.psn;
      param.private_data_len    = cmd.len;
      param.responder_resources = cmd.responder_resources;
      param.initiator_depth     = cmd.initiator_depth;
      param.failover_accepted   = cmd.failover_accepted;
      param.flow_control        = cmd.flow_control;
      param.rnr_retry_count     = cmd.rnr_retry_count;
      param.srq                 = cmd.srq;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            ctx->uid = cmd.uid;
            result = ib_send_cm_rep(ctx->cm_id, &param);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

      kfree(param.private_data);
      return result;
}

static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
                              const char __user *inbuf, int in_len,
                              int (*func)(struct ib_cm_id *cm_id,
                                        const void *private_data,
                                        u8 private_data_len))
{
      struct ib_ucm_private_data cmd;
      struct ib_ucm_context *ctx;
      const void *private_data = NULL;
      int result;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
      if (result)
            return result;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = func(ctx->cm_id, private_data, cmd.len);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

      kfree(private_data);
      return result;
}

static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
}

static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
                        const char __user *inbuf,
                        int in_len, int out_len)
{
      return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
}

static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
                        const char __user *inbuf,
                        int in_len, int out_len)
{
      return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
}

static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
                        const char __user *inbuf, int in_len,
                        int (*func)(struct ib_cm_id *cm_id,
                                  int status,
                                  const void *info,
                                  u8 info_len,
                                  const void *data,
                                  u8 data_len))
{
      struct ib_ucm_context *ctx;
      struct ib_ucm_info cmd;
      const void *data = NULL;
      const void *info = NULL;
      int result;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
      if (result)
            goto done;

      result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
      if (result)
            goto done;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
                        data, cmd.data_len);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

done:
      kfree(data);
      kfree(info);
      return result;
}

static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
}

static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
}

static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct ib_ucm_context *ctx;
      struct ib_ucm_mra cmd;
      const void *data = NULL;
      int result;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
      if (result)
            return result;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

      kfree(data);
      return result;
}

static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct ib_ucm_context *ctx;
      struct ib_sa_path_rec *path = NULL;
      struct ib_ucm_lap cmd;
      const void *data = NULL;
      int result;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
      if (result)
            goto done;

      result = ib_ucm_path_get(&path, cmd.path);
      if (result)
            goto done;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

done:
      kfree(data);
      kfree(path);
      return result;
}

static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
                            const char __user *inbuf,
                            int in_len, int out_len)
{
      struct ib_cm_sidr_req_param param;
      struct ib_ucm_context *ctx;
      struct ib_ucm_sidr_req cmd;
      int result;

      param.private_data = NULL;
      param.path = NULL;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&param.private_data, cmd.data, cmd.len);
      if (result)
            goto done;

      result = ib_ucm_path_get(&param.path, cmd.path);
      if (result)
            goto done;

      param.private_data_len = cmd.len;
      param.service_id       = cmd.sid;
      param.timeout_ms       = cmd.timeout;
      param.max_cm_retries   = cmd.max_cm_retries;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = ib_send_cm_sidr_req(ctx->cm_id, &param);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

done:
      kfree(param.private_data);
      kfree(param.path);
      return result;
}

static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
                            const char __user *inbuf,
                            int in_len, int out_len)
{
      struct ib_cm_sidr_rep_param param;
      struct ib_ucm_sidr_rep cmd;
      struct ib_ucm_context *ctx;
      int result;

      param.info = NULL;

      if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
            return -EFAULT;

      result = ib_ucm_alloc_data(&param.private_data,
                           cmd.data, cmd.data_len);
      if (result)
            goto done;

      result = ib_ucm_alloc_data(&param.info, cmd.info, cmd.info_len);
      if (result)
            goto done;

      param.qp_num            = cmd.qpn;
      param.qkey        = cmd.qkey;
      param.status            = cmd.status;
      param.info_length = cmd.info_len;
      param.private_data_len  = cmd.data_len;

      ctx = ib_ucm_ctx_get(file, cmd.id);
      if (!IS_ERR(ctx)) {
            result = ib_send_cm_sidr_rep(ctx->cm_id, &param);
            ib_ucm_ctx_put(ctx);
      } else
            result = PTR_ERR(ctx);

done:
      kfree(param.private_data);
      kfree(param.info);
      return result;
}

static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
                          const char __user *inbuf,
                          int in_len, int out_len) = {
      [IB_USER_CM_CMD_CREATE_ID]     = ib_ucm_create_id,
      [IB_USER_CM_CMD_DESTROY_ID]    = ib_ucm_destroy_id,
      [IB_USER_CM_CMD_ATTR_ID]       = ib_ucm_attr_id,
      [IB_USER_CM_CMD_LISTEN]        = ib_ucm_listen,
      [IB_USER_CM_CMD_NOTIFY]        = ib_ucm_notify,
      [IB_USER_CM_CMD_SEND_REQ]      = ib_ucm_send_req,
      [IB_USER_CM_CMD_SEND_REP]      = ib_ucm_send_rep,
      [IB_USER_CM_CMD_SEND_RTU]      = ib_ucm_send_rtu,
      [IB_USER_CM_CMD_SEND_DREQ]     = ib_ucm_send_dreq,
      [IB_USER_CM_CMD_SEND_DREP]     = ib_ucm_send_drep,
      [IB_USER_CM_CMD_SEND_REJ]      = ib_ucm_send_rej,
      [IB_USER_CM_CMD_SEND_MRA]      = ib_ucm_send_mra,
      [IB_USER_CM_CMD_SEND_LAP]      = ib_ucm_send_lap,
      [IB_USER_CM_CMD_SEND_APR]      = ib_ucm_send_apr,
      [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
      [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
      [IB_USER_CM_CMD_EVENT]         = ib_ucm_event,
      [IB_USER_CM_CMD_INIT_QP_ATTR]  = ib_ucm_init_qp_attr,
};

static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
                      size_t len, loff_t *pos)
{
      struct ib_ucm_file *file = filp->private_data;
      struct ib_ucm_cmd_hdr hdr;
      ssize_t result;

      if (len < sizeof(hdr))
            return -EINVAL;

      if (copy_from_user(&hdr, buf, sizeof(hdr)))
            return -EFAULT;

      if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
            return -EINVAL;

      if (hdr.in + sizeof(hdr) > len)
            return -EINVAL;

      result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
                              hdr.in, hdr.out);
      if (!result)
            result = len;

      return result;
}

static unsigned int ib_ucm_poll(struct file *filp,
                        struct poll_table_struct *wait)
{
      struct ib_ucm_file *file = filp->private_data;
      unsigned int mask = 0;

      poll_wait(filp, &file->poll_wait, wait);

      if (!list_empty(&file->events))
            mask = POLLIN | POLLRDNORM;

      return mask;
}

static int ib_ucm_open(struct inode *inode, struct file *filp)
{
      struct ib_ucm_file *file;

      file = kmalloc(sizeof(*file), GFP_KERNEL);
      if (!file)
            return -ENOMEM;

      INIT_LIST_HEAD(&file->events);
      INIT_LIST_HEAD(&file->ctxs);
      init_waitqueue_head(&file->poll_wait);

      mutex_init(&file->file_mutex);

      filp->private_data = file;
      file->filp = filp;
      file->device = container_of(inode->i_cdev, struct ib_ucm_device, dev);

      return 0;
}

static int ib_ucm_close(struct inode *inode, struct file *filp)
{
      struct ib_ucm_file *file = filp->private_data;
      struct ib_ucm_context *ctx;

      mutex_lock(&file->file_mutex);
      while (!list_empty(&file->ctxs)) {
            ctx = list_entry(file->ctxs.next,
                         struct ib_ucm_context, file_list);
            mutex_unlock(&file->file_mutex);

            mutex_lock(&ctx_id_mutex);
            idr_remove(&ctx_id_table, ctx->id);
            mutex_unlock(&ctx_id_mutex);

            ib_destroy_cm_id(ctx->cm_id);
            ib_ucm_cleanup_events(ctx);
            kfree(ctx);

            mutex_lock(&file->file_mutex);
      }
      mutex_unlock(&file->file_mutex);
      kfree(file);
      return 0;
}

static void ib_ucm_release_class_dev(struct class_device *class_dev)
{
      struct ib_ucm_device *dev;

      dev = container_of(class_dev, struct ib_ucm_device, class_dev);
      cdev_del(&dev->dev);
      clear_bit(dev->devnum, dev_map);
      kfree(dev);
}

static const struct file_operations ucm_fops = {
      .owner       = THIS_MODULE,
      .open        = ib_ucm_open,
      .release = ib_ucm_close,
      .write       = ib_ucm_write,
      .poll    = ib_ucm_poll,
};

static struct class ucm_class = {
      .name    = "infiniband_cm",
      .release = ib_ucm_release_class_dev
};

static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
      struct ib_ucm_device *dev;

      dev = container_of(class_dev, struct ib_ucm_device, class_dev);
      return sprintf(buf, "%s\n", dev->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);

static void ib_ucm_add_one(struct ib_device *device)
{
      struct ib_ucm_device *ucm_dev;

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

      ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
      if (!ucm_dev)
            return;

      ucm_dev->ib_dev = device;

      ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
      if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
            goto err;

      set_bit(ucm_dev->devnum, dev_map);

      cdev_init(&ucm_dev->dev, &ucm_fops);
      ucm_dev->dev.owner = THIS_MODULE;
      kobject_set_name(&ucm_dev->dev.kobj, "ucm%d", ucm_dev->devnum);
      if (cdev_add(&ucm_dev->dev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
            goto err;

      ucm_dev->class_dev.class = &ucm_class;
      ucm_dev->class_dev.dev = device->dma_device;
      ucm_dev->class_dev.devt = ucm_dev->dev.dev;
      snprintf(ucm_dev->class_dev.class_id, BUS_ID_SIZE, "ucm%d",
             ucm_dev->devnum);
      if (class_device_register(&ucm_dev->class_dev))
            goto err_cdev;

      if (class_device_create_file(&ucm_dev->class_dev,
                             &class_device_attr_ibdev))
            goto err_class;

      ib_set_client_data(device, &ucm_client, ucm_dev);
      return;

err_class:
      class_device_unregister(&ucm_dev->class_dev);
err_cdev:
      cdev_del(&ucm_dev->dev);
      clear_bit(ucm_dev->devnum, dev_map);
err:
      kfree(ucm_dev);
      return;
}

static void ib_ucm_remove_one(struct ib_device *device)
{
      struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);

      if (!ucm_dev)
            return;

      class_device_unregister(&ucm_dev->class_dev);
}

static ssize_t show_abi_version(struct class *class, char *buf)
{
      return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
}
static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);

static int __init ib_ucm_init(void)
{
      int ret;

      ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
                             "infiniband_cm");
      if (ret) {
            printk(KERN_ERR "ucm: couldn't register device number\n");
            goto err;
      }

      ret = class_register(&ucm_class);
      if (ret) {
            printk(KERN_ERR "ucm: couldn't create class infiniband_cm\n");
            goto err_chrdev;
      }

      ret = class_create_file(&ucm_class, &class_attr_abi_version);
      if (ret) {
            printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
            goto err_class;
      }

      ret = ib_register_client(&ucm_client);
      if (ret) {
            printk(KERN_ERR "ucm: couldn't register client\n");
            goto err_class;
      }
      return 0;

err_class:
      class_unregister(&ucm_class);
err_chrdev:
      unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
err:
      return ret;
}

static void __exit ib_ucm_cleanup(void)
{
      ib_unregister_client(&ucm_client);
      class_unregister(&ucm_class);
      unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
      idr_destroy(&ctx_id_table);
}

module_init(ib_ucm_init);
module_exit(ib_ucm_cleanup);

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