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ucma.c

/*
 * Copyright (c) 2005-2006 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.
 */

#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/idr.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/miscdevice.h>

#include <rdma/rdma_user_cm.h>
#include <rdma/ib_marshall.h>
#include <rdma/rdma_cm.h>

MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
MODULE_LICENSE("Dual BSD/GPL");

enum {
      UCMA_MAX_BACKLOG  = 128
};

struct ucma_file {
      struct mutex            mut;
      struct file       *filp;
      struct list_head  ctx_list;
      struct list_head  event_list;
      wait_queue_head_t poll_wait;
};

struct ucma_context {
      int               id;
      struct completion comp;
      atomic_t          ref;
      int               events_reported;
      int               backlog;

      struct ucma_file  *file;
      struct rdma_cm_id *cm_id;
      u64               uid;

      struct list_head  list;
      struct list_head  mc_list;
};

struct ucma_multicast {
      struct ucma_context     *ctx;
      int               id;
      int               events_reported;

      u64               uid;
      struct list_head  list;
      struct sockaddr         addr;
      u8                pad[sizeof(struct sockaddr_in6) -
                            sizeof(struct sockaddr)];
};

struct ucma_event {
      struct ucma_context     *ctx;
      struct ucma_multicast   *mc;
      struct list_head  list;
      struct rdma_cm_id *cm_id;
      struct rdma_ucm_event_resp resp;
};

static DEFINE_MUTEX(mut);
static DEFINE_IDR(ctx_idr);
static DEFINE_IDR(multicast_idr);

static inline struct ucma_context *_ucma_find_context(int id,
                                          struct ucma_file *file)
{
      struct ucma_context *ctx;

      ctx = idr_find(&ctx_idr, id);
      if (!ctx)
            ctx = ERR_PTR(-ENOENT);
      else if (ctx->file != file)
            ctx = ERR_PTR(-EINVAL);
      return ctx;
}

static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
{
      struct ucma_context *ctx;

      mutex_lock(&mut);
      ctx = _ucma_find_context(id, file);
      if (!IS_ERR(ctx))
            atomic_inc(&ctx->ref);
      mutex_unlock(&mut);
      return ctx;
}

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

static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
{
      struct ucma_context *ctx;
      int ret;

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

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

      do {
            ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
            if (!ret)
                  goto error;

            mutex_lock(&mut);
            ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
            mutex_unlock(&mut);
      } while (ret == -EAGAIN);

      if (ret)
            goto error;

      list_add_tail(&ctx->list, &file->ctx_list);
      return ctx;

error:
      kfree(ctx);
      return NULL;
}

static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
{
      struct ucma_multicast *mc;
      int ret;

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

      do {
            ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
            if (!ret)
                  goto error;

            mutex_lock(&mut);
            ret = idr_get_new(&multicast_idr, mc, &mc->id);
            mutex_unlock(&mut);
      } while (ret == -EAGAIN);

      if (ret)
            goto error;

      mc->ctx = ctx;
      list_add_tail(&mc->list, &ctx->mc_list);
      return mc;

error:
      kfree(mc);
      return NULL;
}

static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
                         struct rdma_conn_param *src)
{
      if (src->private_data_len)
            memcpy(dst->private_data, src->private_data,
                   src->private_data_len);
      dst->private_data_len = src->private_data_len;
      dst->responder_resources =src->responder_resources;
      dst->initiator_depth = src->initiator_depth;
      dst->flow_control = src->flow_control;
      dst->retry_count = src->retry_count;
      dst->rnr_retry_count = src->rnr_retry_count;
      dst->srq = src->srq;
      dst->qp_num = src->qp_num;
}

static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
                         struct rdma_ud_param *src)
{
      if (src->private_data_len)
            memcpy(dst->private_data, src->private_data,
                   src->private_data_len);
      dst->private_data_len = src->private_data_len;
      ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
      dst->qp_num = src->qp_num;
      dst->qkey = src->qkey;
}

static void ucma_set_event_context(struct ucma_context *ctx,
                           struct rdma_cm_event *event,
                           struct ucma_event *uevent)
{
      uevent->ctx = ctx;
      switch (event->event) {
      case RDMA_CM_EVENT_MULTICAST_JOIN:
      case RDMA_CM_EVENT_MULTICAST_ERROR:
            uevent->mc = (struct ucma_multicast *)
                       event->param.ud.private_data;
            uevent->resp.uid = uevent->mc->uid;
            uevent->resp.id = uevent->mc->id;
            break;
      default:
            uevent->resp.uid = ctx->uid;
            uevent->resp.id = ctx->id;
            break;
      }
}

static int ucma_event_handler(struct rdma_cm_id *cm_id,
                        struct rdma_cm_event *event)
{
      struct ucma_event *uevent;
      struct ucma_context *ctx = cm_id->context;
      int ret = 0;

      uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
      if (!uevent)
            return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;

      uevent->cm_id = cm_id;
      ucma_set_event_context(ctx, event, uevent);
      uevent->resp.event = event->event;
      uevent->resp.status = event->status;
      if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
            ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
      else
            ucma_copy_conn_event(&uevent->resp.param.conn,
                             &event->param.conn);

      mutex_lock(&ctx->file->mut);
      if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
            if (!ctx->backlog) {
                  ret = -ENOMEM;
                  kfree(uevent);
                  goto out;
            }
            ctx->backlog--;
      } else if (!ctx->uid) {
            /*
             * We ignore events for new connections until userspace has set
             * their context.  This can only happen if an error occurs on a
             * new connection before the user accepts it.  This is okay,
             * since the accept will just fail later.
             */
            kfree(uevent);
            goto out;
      }

      list_add_tail(&uevent->list, &ctx->file->event_list);
      wake_up_interruptible(&ctx->file->poll_wait);
out:
      mutex_unlock(&ctx->file->mut);
      return ret;
}

static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
                        int in_len, int out_len)
{
      struct ucma_context *ctx;
      struct rdma_ucm_get_event cmd;
      struct ucma_event *uevent;
      int ret = 0;
      DEFINE_WAIT(wait);

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

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

      mutex_lock(&file->mut);
      while (list_empty(&file->event_list)) {
            mutex_unlock(&file->mut);

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

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

            mutex_lock(&file->mut);
      }

      uevent = list_entry(file->event_list.next, struct ucma_event, list);

      if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
            ctx = ucma_alloc_ctx(file);
            if (!ctx) {
                  ret = -ENOMEM;
                  goto done;
            }
            uevent->ctx->backlog++;
            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)) {
            ret = -EFAULT;
            goto done;
      }

      list_del(&uevent->list);
      uevent->ctx->events_reported++;
      if (uevent->mc)
            uevent->mc->events_reported++;
      kfree(uevent);
done:
      mutex_unlock(&file->mut);
      return ret;
}

static ssize_t ucma_create_id(struct ucma_file *file,
                        const char __user *inbuf,
                        int in_len, int out_len)
{
      struct rdma_ucm_create_id cmd;
      struct rdma_ucm_create_id_resp resp;
      struct ucma_context *ctx;
      int ret;

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

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

      mutex_lock(&file->mut);
      ctx = ucma_alloc_ctx(file);
      mutex_unlock(&file->mut);
      if (!ctx)
            return -ENOMEM;

      ctx->uid = cmd.uid;
      ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
      if (IS_ERR(ctx->cm_id)) {
            ret = PTR_ERR(ctx->cm_id);
            goto err1;
      }

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

err2:
      rdma_destroy_id(ctx->cm_id);
err1:
      mutex_lock(&mut);
      idr_remove(&ctx_idr, ctx->id);
      mutex_unlock(&mut);
      kfree(ctx);
      return ret;
}

static void ucma_cleanup_multicast(struct ucma_context *ctx)
{
      struct ucma_multicast *mc, *tmp;

      mutex_lock(&mut);
      list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
            list_del(&mc->list);
            idr_remove(&multicast_idr, mc->id);
            kfree(mc);
      }
      mutex_unlock(&mut);
}

static void ucma_cleanup_events(struct ucma_context *ctx)
{
      struct ucma_event *uevent, *tmp;

      list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
            if (uevent->ctx != ctx)
                  continue;

            list_del(&uevent->list);

            /* clear incoming connections. */
            if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
                  rdma_destroy_id(uevent->cm_id);

            kfree(uevent);
      }
}

static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
{
      struct ucma_event *uevent, *tmp;

      list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
            if (uevent->mc != mc)
                  continue;

            list_del(&uevent->list);
            kfree(uevent);
      }
}

static int ucma_free_ctx(struct ucma_context *ctx)
{
      int events_reported;

      /* No new events will be generated after destroying the id. */
      rdma_destroy_id(ctx->cm_id);

      ucma_cleanup_multicast(ctx);

      /* Cleanup events not yet reported to the user. */
      mutex_lock(&ctx->file->mut);
      ucma_cleanup_events(ctx);
      list_del(&ctx->list);
      mutex_unlock(&ctx->file->mut);

      events_reported = ctx->events_reported;
      kfree(ctx);
      return events_reported;
}

static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
                         int in_len, int out_len)
{
      struct rdma_ucm_destroy_id cmd;
      struct rdma_ucm_destroy_id_resp resp;
      struct ucma_context *ctx;
      int ret = 0;

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

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

      mutex_lock(&mut);
      ctx = _ucma_find_context(cmd.id, file);
      if (!IS_ERR(ctx))
            idr_remove(&ctx_idr, ctx->id);
      mutex_unlock(&mut);

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

      ucma_put_ctx(ctx);
      wait_for_completion(&ctx->comp);
      resp.events_reported = ucma_free_ctx(ctx);

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

      return ret;
}

static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
                        int in_len, int out_len)
{
      struct rdma_ucm_bind_addr cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_resolve_addr(struct ucma_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct rdma_ucm_resolve_addr cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
                        (struct sockaddr *) &cmd.dst_addr,
                        cmd.timeout_ms);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_resolve_route(struct ucma_file *file,
                          const char __user *inbuf,
                          int in_len, int out_len)
{
      struct rdma_ucm_resolve_route cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
      ucma_put_ctx(ctx);
      return ret;
}

static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
                         struct rdma_route *route)
{
      struct rdma_dev_addr *dev_addr;

      resp->num_paths = route->num_paths;
      switch (route->num_paths) {
      case 0:
            dev_addr = &route->addr.dev_addr;
            ib_addr_get_dgid(dev_addr,
                         (union ib_gid *) &resp->ib_route[0].dgid);
            ib_addr_get_sgid(dev_addr,
                         (union ib_gid *) &resp->ib_route[0].sgid);
            resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
            break;
      case 2:
            ib_copy_path_rec_to_user(&resp->ib_route[1],
                               &route->path_rec[1]);
            /* fall through */
      case 1:
            ib_copy_path_rec_to_user(&resp->ib_route[0],
                               &route->path_rec[0]);
            break;
      default:
            break;
      }
}

static ssize_t ucma_query_route(struct ucma_file *file,
                        const char __user *inbuf,
                        int in_len, int out_len)
{
      struct rdma_ucm_query_route cmd;
      struct rdma_ucm_query_route_resp resp;
      struct ucma_context *ctx;
      struct sockaddr *addr;
      int ret = 0;

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

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

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

      memset(&resp, 0, sizeof resp);
      addr = &ctx->cm_id->route.addr.src_addr;
      memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
                             sizeof(struct sockaddr_in) :
                             sizeof(struct sockaddr_in6));
      addr = &ctx->cm_id->route.addr.dst_addr;
      memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
                             sizeof(struct sockaddr_in) :
                             sizeof(struct sockaddr_in6));
      if (!ctx->cm_id->device)
            goto out;

      resp.node_guid = ctx->cm_id->device->node_guid;
      resp.port_num = ctx->cm_id->port_num;
      switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
      case RDMA_TRANSPORT_IB:
            ucma_copy_ib_route(&resp, &ctx->cm_id->route);
            break;
      default:
            break;
      }

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

      ucma_put_ctx(ctx);
      return ret;
}

static void ucma_copy_conn_param(struct rdma_conn_param *dst,
                         struct rdma_ucm_conn_param *src)
{
      dst->private_data = src->private_data;
      dst->private_data_len = src->private_data_len;
      dst->responder_resources =src->responder_resources;
      dst->initiator_depth = src->initiator_depth;
      dst->flow_control = src->flow_control;
      dst->retry_count = src->retry_count;
      dst->rnr_retry_count = src->rnr_retry_count;
      dst->srq = src->srq;
      dst->qp_num = src->qp_num;
}

static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
                      int in_len, int out_len)
{
      struct rdma_ucm_connect cmd;
      struct rdma_conn_param conn_param;
      struct ucma_context *ctx;
      int ret;

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

      if (!cmd.conn_param.valid)
            return -EINVAL;

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

      ucma_copy_conn_param(&conn_param, &cmd.conn_param);
      ret = rdma_connect(ctx->cm_id, &conn_param);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
                     int in_len, int out_len)
{
      struct rdma_ucm_listen cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
                   cmd.backlog : UCMA_MAX_BACKLOG;
      ret = rdma_listen(ctx->cm_id, ctx->backlog);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
                     int in_len, int out_len)
{
      struct rdma_ucm_accept cmd;
      struct rdma_conn_param conn_param;
      struct ucma_context *ctx;
      int ret;

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

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

      if (cmd.conn_param.valid) {
            ctx->uid = cmd.uid;
            ucma_copy_conn_param(&conn_param, &cmd.conn_param);
            ret = rdma_accept(ctx->cm_id, &conn_param);
      } else
            ret = rdma_accept(ctx->cm_id, NULL);

      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
                     int in_len, int out_len)
{
      struct rdma_ucm_reject cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
                         int in_len, int out_len)
{
      struct rdma_ucm_disconnect cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ret = rdma_disconnect(ctx->cm_id);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_init_qp_attr(struct ucma_file *file,
                         const char __user *inbuf,
                         int in_len, int out_len)
{
      struct rdma_ucm_init_qp_attr cmd;
      struct ib_uverbs_qp_attr resp;
      struct ucma_context *ctx;
      struct ib_qp_attr qp_attr;
      int ret;

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

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

      ctx = ucma_get_ctx(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;
      ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
      if (ret)
            goto out;

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

out:
      ucma_put_ctx(ctx);
      return ret;
}

static int ucma_set_option_id(struct ucma_context *ctx, int optname,
                        void *optval, size_t optlen)
{
      int ret = 0;

      switch (optname) {
      case RDMA_OPTION_ID_TOS:
            if (optlen != sizeof(u8)) {
                  ret = -EINVAL;
                  break;
            }
            rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
            break;
      default:
            ret = -ENOSYS;
      }

      return ret;
}

static int ucma_set_option_level(struct ucma_context *ctx, int level,
                         int optname, void *optval, size_t optlen)
{
      int ret;

      switch (level) {
      case RDMA_OPTION_ID:
            ret = ucma_set_option_id(ctx, optname, optval, optlen);
            break;
      default:
            ret = -ENOSYS;
      }

      return ret;
}

static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
                         int in_len, int out_len)
{
      struct rdma_ucm_set_option cmd;
      struct ucma_context *ctx;
      void *optval;
      int ret;

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

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

      optval = kmalloc(cmd.optlen, GFP_KERNEL);
      if (!optval) {
            ret = -ENOMEM;
            goto out1;
      }

      if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
                     cmd.optlen)) {
            ret = -EFAULT;
            goto out2;
      }

      ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
                            cmd.optlen);
out2:
      kfree(optval);
out1:
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
                     int in_len, int out_len)
{
      struct rdma_ucm_notify cmd;
      struct ucma_context *ctx;
      int ret;

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

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

      ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_join_multicast(struct ucma_file *file,
                           const char __user *inbuf,
                           int in_len, int out_len)
{
      struct rdma_ucm_join_mcast cmd;
      struct rdma_ucm_create_id_resp resp;
      struct ucma_context *ctx;
      struct ucma_multicast *mc;
      int ret;

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

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

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

      mutex_lock(&file->mut);
      mc = ucma_alloc_multicast(ctx);
      if (IS_ERR(mc)) {
            ret = PTR_ERR(mc);
            goto err1;
      }

      mc->uid = cmd.uid;
      memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
      ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc);
      if (ret)
            goto err2;

      resp.id = mc->id;
      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &resp, sizeof(resp))) {
            ret = -EFAULT;
            goto err3;
      }

      mutex_unlock(&file->mut);
      ucma_put_ctx(ctx);
      return 0;

err3:
      rdma_leave_multicast(ctx->cm_id, &mc->addr);
      ucma_cleanup_mc_events(mc);
err2:
      mutex_lock(&mut);
      idr_remove(&multicast_idr, mc->id);
      mutex_unlock(&mut);
      list_del(&mc->list);
      kfree(mc);
err1:
      mutex_unlock(&file->mut);
      ucma_put_ctx(ctx);
      return ret;
}

static ssize_t ucma_leave_multicast(struct ucma_file *file,
                            const char __user *inbuf,
                            int in_len, int out_len)
{
      struct rdma_ucm_destroy_id cmd;
      struct rdma_ucm_destroy_id_resp resp;
      struct ucma_multicast *mc;
      int ret = 0;

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

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

      mutex_lock(&mut);
      mc = idr_find(&multicast_idr, cmd.id);
      if (!mc)
            mc = ERR_PTR(-ENOENT);
      else if (mc->ctx->file != file)
            mc = ERR_PTR(-EINVAL);
      else {
            idr_remove(&multicast_idr, mc->id);
            atomic_inc(&mc->ctx->ref);
      }
      mutex_unlock(&mut);

      if (IS_ERR(mc)) {
            ret = PTR_ERR(mc);
            goto out;
      }

      rdma_leave_multicast(mc->ctx->cm_id, &mc->addr);
      mutex_lock(&mc->ctx->file->mut);
      ucma_cleanup_mc_events(mc);
      list_del(&mc->list);
      mutex_unlock(&mc->ctx->file->mut);

      ucma_put_ctx(mc->ctx);
      resp.events_reported = mc->events_reported;
      kfree(mc);

      if (copy_to_user((void __user *)(unsigned long)cmd.response,
                   &resp, sizeof(resp)))
            ret = -EFAULT;
out:
      return ret;
}

static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
                           const char __user *inbuf,
                           int in_len, int out_len) = {
      [RDMA_USER_CM_CMD_CREATE_ID]  = ucma_create_id,
      [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
      [RDMA_USER_CM_CMD_BIND_ADDR]  = ucma_bind_addr,
      [RDMA_USER_CM_CMD_RESOLVE_ADDR]     = ucma_resolve_addr,
      [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
      [RDMA_USER_CM_CMD_QUERY_ROUTE]      = ucma_query_route,
      [RDMA_USER_CM_CMD_CONNECT]    = ucma_connect,
      [RDMA_USER_CM_CMD_LISTEN]     = ucma_listen,
      [RDMA_USER_CM_CMD_ACCEPT]     = ucma_accept,
      [RDMA_USER_CM_CMD_REJECT]     = ucma_reject,
      [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
      [RDMA_USER_CM_CMD_INIT_QP_ATTR]     = ucma_init_qp_attr,
      [RDMA_USER_CM_CMD_GET_EVENT]  = ucma_get_event,
      [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
      [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
      [RDMA_USER_CM_CMD_NOTIFY]     = ucma_notify,
      [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
      [RDMA_USER_CM_CMD_LEAVE_MCAST]      = ucma_leave_multicast,
};

static ssize_t ucma_write(struct file *filp, const char __user *buf,
                    size_t len, loff_t *pos)
{
      struct ucma_file *file = filp->private_data;
      struct rdma_ucm_cmd_hdr hdr;
      ssize_t ret;

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

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

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

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

      if (!ucma_cmd_table[hdr.cmd])
            return -ENOSYS;

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

      return ret;
}

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

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

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

      return mask;
}

static int ucma_open(struct inode *inode, struct file *filp)
{
      struct ucma_file *file;

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

      INIT_LIST_HEAD(&file->event_list);
      INIT_LIST_HEAD(&file->ctx_list);
      init_waitqueue_head(&file->poll_wait);
      mutex_init(&file->mut);

      filp->private_data = file;
      file->filp = filp;
      return 0;
}

static int ucma_close(struct inode *inode, struct file *filp)
{
      struct ucma_file *file = filp->private_data;
      struct ucma_context *ctx, *tmp;

      mutex_lock(&file->mut);
      list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
            mutex_unlock(&file->mut);

            mutex_lock(&mut);
            idr_remove(&ctx_idr, ctx->id);
            mutex_unlock(&mut);

            ucma_free_ctx(ctx);
            mutex_lock(&file->mut);
      }
      mutex_unlock(&file->mut);
      kfree(file);
      return 0;
}

static const struct file_operations ucma_fops = {
      .owner       = THIS_MODULE,
      .open        = ucma_open,
      .release = ucma_close,
      .write       = ucma_write,
      .poll    = ucma_poll,
};

static struct miscdevice ucma_misc = {
      .minor      = MISC_DYNAMIC_MINOR,
      .name = "rdma_cm",
      .fops = &ucma_fops,
};

static ssize_t show_abi_version(struct device *dev,
                        struct device_attribute *attr,
                        char *buf)
{
      return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
}
static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);

static int __init ucma_init(void)
{
      int ret;

      ret = misc_register(&ucma_misc);
      if (ret)
            return ret;

      ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
      if (ret) {
            printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
            goto err;
      }
      return 0;
err:
      misc_deregister(&ucma_misc);
      return ret;
}

static void __exit ucma_cleanup(void)
{
      device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
      misc_deregister(&ucma_misc);
      idr_destroy(&ctx_idr);
}

module_init(ucma_init);
module_exit(ucma_cleanup);

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