ib_ucma.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
    3  *
    4  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
    5  *
    6  * This software is available to you under a choice of one of two
    7  * licenses.  You may choose to be licensed under the terms of the GNU
    8  * General Public License (GPL) Version 2, available from the file
    9  * COPYING in the main directory of this source tree, or the
   10  * OpenIB.org BSD license below:
   11  *
   12  *     Redistribution and use in source and binary forms, with or
   13  *     without modification, are permitted provided that the following
   14  *     conditions are met:
   15  *
   16  *      - Redistributions of source code must retain the above
   17  *      copyright notice, this list of conditions and the following
   18  *      disclaimer.
   19  *
   20  *      - Redistributions in binary form must reproduce the above
   21  *      copyright notice, this list of conditions and the following
   22  *      disclaimer in the documentation and/or other materials
   23  *      provided with the distribution.
   24  *
   25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   32  * SOFTWARE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <linux/completion.h>
   39 #include <linux/file.h>
   40 #include <linux/mutex.h>
   41 #include <linux/poll.h>
   42 #include <linux/sched.h>
   43 #include <linux/idr.h>
   44 #include <linux/in.h>
   45 #include <linux/in6.h>
   46 #include <linux/miscdevice.h>
   47 #include <linux/slab.h>
   48 #include <linux/module.h>
   49 
   50 #include <sys/filio.h>
   51 
   52 #include <rdma/rdma_user_cm.h>
   53 #include <rdma/ib_marshall.h>
   54 #include <rdma/rdma_cm.h>
   55 #include <rdma/rdma_cm_ib.h>
   56 #include <rdma/ib_addr.h>
   57 #include <rdma/ib.h>
   58 
   59 MODULE_AUTHOR("Sean Hefty");
   60 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
   61 MODULE_LICENSE("Dual BSD/GPL");
   62 
   63 static unsigned int max_backlog = 1024;
   64 
   65 struct ucma_file {
   66         struct mutex            mut;
   67         struct file             *filp;
   68         struct list_head        ctx_list;
   69         struct list_head        event_list;
   70         wait_queue_head_t       poll_wait;
   71         struct workqueue_struct *close_wq;
   72 };
   73 
   74 struct ucma_context {
   75         int                     id;
   76         struct completion       comp;
   77         atomic_t                ref;
   78         int                     events_reported;
   79         int                     backlog;
   80 
   81         struct ucma_file        *file;
   82         struct rdma_cm_id       *cm_id;
   83         u64                     uid;
   84 
   85         struct list_head        list;
   86         struct list_head        mc_list;
   87         /* mark that device is in process of destroying the internal HW
   88          * resources, protected by the global mut
   89          */
   90         int                     closing;
   91         /* sync between removal event and id destroy, protected by file mut */
   92         int                     destroying;
   93         struct work_struct      close_work;
   94 };
   95 
   96 struct ucma_multicast {
   97         struct ucma_context     *ctx;
   98         int                     id;
   99         int                     events_reported;
  100 
  101         u64                     uid;
  102         u8                      join_state;
  103         struct list_head        list;
  104         struct sockaddr_storage addr;
  105 };
  106 
  107 struct ucma_event {
  108         struct ucma_context     *ctx;
  109         struct ucma_multicast   *mc;
  110         struct list_head        list;
  111         struct rdma_cm_id       *cm_id;
  112         struct rdma_ucm_event_resp resp;
  113         struct work_struct      close_work;
  114 };
  115 
  116 static DEFINE_MUTEX(mut);
  117 static DEFINE_IDR(ctx_idr);
  118 static DEFINE_IDR(multicast_idr);
  119 
  120 static inline struct ucma_context *_ucma_find_context(int id,
  121                                                       struct ucma_file *file)
  122 {
  123         struct ucma_context *ctx;
  124 
  125         ctx = idr_find(&ctx_idr, id);
  126         if (!ctx)
  127                 ctx = ERR_PTR(-ENOENT);
  128         else if (ctx->file != file || !ctx->cm_id)
  129                 ctx = ERR_PTR(-EINVAL);
  130         return ctx;
  131 }
  132 
  133 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
  134 {
  135         struct ucma_context *ctx;
  136 
  137         mutex_lock(&mut);
  138         ctx = _ucma_find_context(id, file);
  139         if (!IS_ERR(ctx)) {
  140                 if (ctx->closing)
  141                         ctx = ERR_PTR(-EIO);
  142                 else
  143                         atomic_inc(&ctx->ref);
  144         }
  145         mutex_unlock(&mut);
  146         return ctx;
  147 }
  148 
  149 static void ucma_put_ctx(struct ucma_context *ctx)
  150 {
  151         if (atomic_dec_and_test(&ctx->ref))
  152                 complete(&ctx->comp);
  153 }
  154 
  155 /*
  156  * Same as ucm_get_ctx but requires that ->cm_id->device is valid, eg that the
  157  * CM_ID is bound.
  158  */
  159 static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id)
  160 {
  161         struct ucma_context *ctx = ucma_get_ctx(file, id);
  162 
  163         if (IS_ERR(ctx))
  164                 return ctx;
  165         if (!ctx->cm_id->device) {
  166                 ucma_put_ctx(ctx);
  167                 return ERR_PTR(-EINVAL);
  168         }
  169         return ctx;
  170 }
  171 
  172 static void ucma_close_event_id(struct work_struct *work)
  173 {
  174         struct ucma_event *uevent_close =  container_of(work, struct ucma_event, close_work);
  175 
  176         rdma_destroy_id(uevent_close->cm_id);
  177         kfree(uevent_close);
  178 }
  179 
  180 static void ucma_close_id(struct work_struct *work)
  181 {
  182         struct ucma_context *ctx =  container_of(work, struct ucma_context, close_work);
  183 
  184         /* once all inflight tasks are finished, we close all underlying
  185          * resources. The context is still alive till its explicit destryoing
  186          * by its creator.
  187          */
  188         ucma_put_ctx(ctx);
  189         wait_for_completion(&ctx->comp);
  190         /* No new events will be generated after destroying the id. */
  191         rdma_destroy_id(ctx->cm_id);
  192 }
  193 
  194 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
  195 {
  196         struct ucma_context *ctx;
  197 
  198         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  199         if (!ctx)
  200                 return NULL;
  201 
  202         INIT_WORK(&ctx->close_work, ucma_close_id);
  203         atomic_set(&ctx->ref, 1);
  204         init_completion(&ctx->comp);
  205         INIT_LIST_HEAD(&ctx->mc_list);
  206         ctx->file = file;
  207 
  208         mutex_lock(&mut);
  209         ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
  210         mutex_unlock(&mut);
  211         if (ctx->id < 0)
  212                 goto error;
  213 
  214         list_add_tail(&ctx->list, &file->ctx_list);
  215         return ctx;
  216 
  217 error:
  218         kfree(ctx);
  219         return NULL;
  220 }
  221 
  222 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
  223 {
  224         struct ucma_multicast *mc;
  225 
  226         mc = kzalloc(sizeof(*mc), GFP_KERNEL);
  227         if (!mc)
  228                 return NULL;
  229 
  230         mutex_lock(&mut);
  231         mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
  232         mutex_unlock(&mut);
  233         if (mc->id < 0)
  234                 goto error;
  235 
  236         mc->ctx = ctx;
  237         list_add_tail(&mc->list, &ctx->mc_list);
  238         return mc;
  239 
  240 error:
  241         kfree(mc);
  242         return NULL;
  243 }
  244 
  245 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
  246                                  struct rdma_conn_param *src)
  247 {
  248         if (src->private_data_len)
  249                 memcpy(dst->private_data, src->private_data,
  250                        src->private_data_len);
  251         dst->private_data_len = src->private_data_len;
  252         dst->responder_resources =src->responder_resources;
  253         dst->initiator_depth = src->initiator_depth;
  254         dst->flow_control = src->flow_control;
  255         dst->retry_count = src->retry_count;
  256         dst->rnr_retry_count = src->rnr_retry_count;
  257         dst->srq = src->srq;
  258         dst->qp_num = src->qp_num;
  259 }
  260 
  261 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
  262                                struct rdma_ud_param *src)
  263 {
  264         if (src->private_data_len)
  265                 memcpy(dst->private_data, src->private_data,
  266                        src->private_data_len);
  267         dst->private_data_len = src->private_data_len;
  268         ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
  269         dst->qp_num = src->qp_num;
  270         dst->qkey = src->qkey;
  271 }
  272 
  273 static void ucma_set_event_context(struct ucma_context *ctx,
  274                                    struct rdma_cm_event *event,
  275                                    struct ucma_event *uevent)
  276 {
  277         uevent->ctx = ctx;
  278         switch (event->event) {
  279         case RDMA_CM_EVENT_MULTICAST_JOIN:
  280         case RDMA_CM_EVENT_MULTICAST_ERROR:
  281                 uevent->mc = __DECONST(struct ucma_multicast *,
  282                     event->param.ud.private_data);
  283                 uevent->resp.uid = uevent->mc->uid;
  284                 uevent->resp.id = uevent->mc->id;
  285                 break;
  286         default:
  287                 uevent->resp.uid = ctx->uid;
  288                 uevent->resp.id = ctx->id;
  289                 break;
  290         }
  291 }
  292 
  293 /* Called with file->mut locked for the relevant context. */
  294 static void ucma_removal_event_handler(struct rdma_cm_id *cm_id)
  295 {
  296         struct ucma_context *ctx = cm_id->context;
  297         struct ucma_event *con_req_eve;
  298         int event_found = 0;
  299 
  300         if (ctx->destroying)
  301                 return;
  302 
  303         /* only if context is pointing to cm_id that it owns it and can be
  304          * queued to be closed, otherwise that cm_id is an inflight one that
  305          * is part of that context event list pending to be detached and
  306          * reattached to its new context as part of ucma_get_event,
  307          * handled separately below.
  308          */
  309         if (ctx->cm_id == cm_id) {
  310                 mutex_lock(&mut);
  311                 ctx->closing = 1;
  312                 mutex_unlock(&mut);
  313                 queue_work(ctx->file->close_wq, &ctx->close_work);
  314                 return;
  315         }
  316 
  317         list_for_each_entry(con_req_eve, &ctx->file->event_list, list) {
  318                 if (con_req_eve->cm_id == cm_id &&
  319                     con_req_eve->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
  320                         list_del(&con_req_eve->list);
  321                         INIT_WORK(&con_req_eve->close_work, ucma_close_event_id);
  322                         queue_work(ctx->file->close_wq, &con_req_eve->close_work);
  323                         event_found = 1;
  324                         break;
  325                 }
  326         }
  327         if (!event_found)
  328                 pr_err("ucma_removal_event_handler: warning: connect request event wasn't found\n");
  329 }
  330 
  331 static int ucma_event_handler(struct rdma_cm_id *cm_id,
  332                               struct rdma_cm_event *event)
  333 {
  334         struct ucma_event *uevent;
  335         struct ucma_context *ctx = cm_id->context;
  336         int ret = 0;
  337 
  338         uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
  339         if (!uevent)
  340                 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
  341 
  342         mutex_lock(&ctx->file->mut);
  343         uevent->cm_id = cm_id;
  344         ucma_set_event_context(ctx, event, uevent);
  345         uevent->resp.event = event->event;
  346         uevent->resp.status = event->status;
  347         if (cm_id->qp_type == IB_QPT_UD)
  348                 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
  349         else
  350                 ucma_copy_conn_event(&uevent->resp.param.conn,
  351                                      &event->param.conn);
  352 
  353         if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
  354                 if (!ctx->backlog) {
  355                         ret = -ENOMEM;
  356                         kfree(uevent);
  357                         goto out;
  358                 }
  359                 ctx->backlog--;
  360         } else if (!ctx->uid || ctx->cm_id != cm_id) {
  361                 /*
  362                  * We ignore events for new connections until userspace has set
  363                  * their context.  This can only happen if an error occurs on a
  364                  * new connection before the user accepts it.  This is okay,
  365                  * since the accept will just fail later. However, we do need
  366                  * to release the underlying HW resources in case of a device
  367                  * removal event.
  368                  */
  369                 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
  370                         ucma_removal_event_handler(cm_id);
  371 
  372                 kfree(uevent);
  373                 goto out;
  374         }
  375 
  376         list_add_tail(&uevent->list, &ctx->file->event_list);
  377         wake_up_interruptible(&ctx->file->poll_wait);
  378         if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
  379                 ucma_removal_event_handler(cm_id);
  380 out:
  381         mutex_unlock(&ctx->file->mut);
  382         return ret;
  383 }
  384 
  385 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
  386                               int in_len, int out_len)
  387 {
  388         struct ucma_context *ctx;
  389         struct rdma_ucm_get_event cmd;
  390         struct ucma_event *uevent;
  391         int ret = 0;
  392 
  393         if (out_len < sizeof uevent->resp)
  394                 return -ENOSPC;
  395 
  396         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  397                 return -EFAULT;
  398 
  399         mutex_lock(&file->mut);
  400         while (list_empty(&file->event_list)) {
  401                 mutex_unlock(&file->mut);
  402 
  403                 if (file->filp->f_flags & O_NONBLOCK)
  404                         return -EAGAIN;
  405 
  406                 if (wait_event_interruptible(file->poll_wait,
  407                                              !list_empty(&file->event_list)))
  408                         return -ERESTARTSYS;
  409 
  410                 mutex_lock(&file->mut);
  411         }
  412 
  413         uevent = list_entry(file->event_list.next, struct ucma_event, list);
  414 
  415         if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
  416                 ctx = ucma_alloc_ctx(file);
  417                 if (!ctx) {
  418                         ret = -ENOMEM;
  419                         goto done;
  420                 }
  421                 uevent->ctx->backlog++;
  422                 ctx->cm_id = uevent->cm_id;
  423                 ctx->cm_id->context = ctx;
  424                 uevent->resp.id = ctx->id;
  425         }
  426 
  427         if (copy_to_user((void __user *)(unsigned long)cmd.response,
  428                          &uevent->resp, sizeof uevent->resp)) {
  429                 ret = -EFAULT;
  430                 goto done;
  431         }
  432 
  433         list_del(&uevent->list);
  434         uevent->ctx->events_reported++;
  435         if (uevent->mc)
  436                 uevent->mc->events_reported++;
  437         kfree(uevent);
  438 done:
  439         mutex_unlock(&file->mut);
  440         return ret;
  441 }
  442 
  443 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
  444 {
  445         switch (cmd->ps) {
  446         case RDMA_PS_TCP:
  447                 *qp_type = IB_QPT_RC;
  448                 return 0;
  449         case RDMA_PS_UDP:
  450         case RDMA_PS_IPOIB:
  451                 *qp_type = IB_QPT_UD;
  452                 return 0;
  453         case RDMA_PS_IB:
  454                 *qp_type = cmd->qp_type;
  455                 return 0;
  456         default:
  457                 return -EINVAL;
  458         }
  459 }
  460 
  461 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
  462                               int in_len, int out_len)
  463 {
  464         struct rdma_ucm_create_id cmd;
  465         struct rdma_ucm_create_id_resp resp;
  466         struct ucma_context *ctx;
  467         struct rdma_cm_id *cm_id;
  468         enum ib_qp_type qp_type;
  469         int ret;
  470 
  471         if (out_len < sizeof(resp))
  472                 return -ENOSPC;
  473 
  474         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  475                 return -EFAULT;
  476 
  477         ret = ucma_get_qp_type(&cmd, &qp_type);
  478         if (ret)
  479                 return ret;
  480 
  481         mutex_lock(&file->mut);
  482         ctx = ucma_alloc_ctx(file);
  483         mutex_unlock(&file->mut);
  484         if (!ctx)
  485                 return -ENOMEM;
  486 
  487         ctx->uid = cmd.uid;
  488         cm_id = rdma_create_id(TD_TO_VNET(curthread),
  489                                ucma_event_handler, ctx, cmd.ps, qp_type);
  490         if (IS_ERR(cm_id)) {
  491                 ret = PTR_ERR(cm_id);
  492                 goto err1;
  493         }
  494 
  495         resp.id = ctx->id;
  496         if (copy_to_user((void __user *)(unsigned long)cmd.response,
  497                          &resp, sizeof(resp))) {
  498                 ret = -EFAULT;
  499                 goto err2;
  500         }
  501 
  502         ctx->cm_id = cm_id;
  503         return 0;
  504 
  505 err2:
  506         rdma_destroy_id(cm_id);
  507 err1:
  508         mutex_lock(&mut);
  509         idr_remove(&ctx_idr, ctx->id);
  510         mutex_unlock(&mut);
  511         mutex_lock(&file->mut);
  512         list_del(&ctx->list);
  513         mutex_unlock(&file->mut);
  514         kfree(ctx);
  515         return ret;
  516 }
  517 
  518 static void ucma_cleanup_multicast(struct ucma_context *ctx)
  519 {
  520         struct ucma_multicast *mc, *tmp;
  521 
  522         mutex_lock(&mut);
  523         list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
  524                 list_del(&mc->list);
  525                 idr_remove(&multicast_idr, mc->id);
  526                 kfree(mc);
  527         }
  528         mutex_unlock(&mut);
  529 }
  530 
  531 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
  532 {
  533         struct ucma_event *uevent, *tmp;
  534 
  535         list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
  536                 if (uevent->mc != mc)
  537                         continue;
  538 
  539                 list_del(&uevent->list);
  540                 kfree(uevent);
  541         }
  542 }
  543 
  544 /*
  545  * ucma_free_ctx is called after the underlying rdma CM-ID is destroyed. At
  546  * this point, no new events will be reported from the hardware. However, we
  547  * still need to cleanup the UCMA context for this ID. Specifically, there
  548  * might be events that have not yet been consumed by the user space software.
  549  * These might include pending connect requests which we have not completed
  550  * processing.  We cannot call rdma_destroy_id while holding the lock of the
  551  * context (file->mut), as it might cause a deadlock. We therefore extract all
  552  * relevant events from the context pending events list while holding the
  553  * mutex. After that we release them as needed.
  554  */
  555 static int ucma_free_ctx(struct ucma_context *ctx)
  556 {
  557         int events_reported;
  558         struct ucma_event *uevent, *tmp;
  559         LIST_HEAD(list);
  560 
  561 
  562         ucma_cleanup_multicast(ctx);
  563 
  564         /* Cleanup events not yet reported to the user. */
  565         mutex_lock(&ctx->file->mut);
  566         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
  567                 if (uevent->ctx == ctx)
  568                         list_move_tail(&uevent->list, &list);
  569         }
  570         list_del(&ctx->list);
  571         mutex_unlock(&ctx->file->mut);
  572 
  573         list_for_each_entry_safe(uevent, tmp, &list, list) {
  574                 list_del(&uevent->list);
  575                 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
  576                         rdma_destroy_id(uevent->cm_id);
  577                 kfree(uevent);
  578         }
  579 
  580         events_reported = ctx->events_reported;
  581         kfree(ctx);
  582         return events_reported;
  583 }
  584 
  585 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
  586                                int in_len, int out_len)
  587 {
  588         struct rdma_ucm_destroy_id cmd;
  589         struct rdma_ucm_destroy_id_resp resp;
  590         struct ucma_context *ctx;
  591         int ret = 0;
  592 
  593         if (out_len < sizeof(resp))
  594                 return -ENOSPC;
  595 
  596         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  597                 return -EFAULT;
  598 
  599         mutex_lock(&mut);
  600         ctx = _ucma_find_context(cmd.id, file);
  601         if (!IS_ERR(ctx))
  602                 idr_remove(&ctx_idr, ctx->id);
  603         mutex_unlock(&mut);
  604 
  605         if (IS_ERR(ctx))
  606                 return PTR_ERR(ctx);
  607 
  608         mutex_lock(&ctx->file->mut);
  609         ctx->destroying = 1;
  610         mutex_unlock(&ctx->file->mut);
  611 
  612         flush_workqueue(ctx->file->close_wq);
  613         /* At this point it's guaranteed that there is no inflight
  614          * closing task */
  615         mutex_lock(&mut);
  616         if (!ctx->closing) {
  617                 mutex_unlock(&mut);
  618                 ucma_put_ctx(ctx);
  619                 wait_for_completion(&ctx->comp);
  620                 rdma_destroy_id(ctx->cm_id);
  621         } else {
  622                 mutex_unlock(&mut);
  623         }
  624 
  625         resp.events_reported = ucma_free_ctx(ctx);
  626         if (copy_to_user((void __user *)(unsigned long)cmd.response,
  627                          &resp, sizeof(resp)))
  628                 ret = -EFAULT;
  629 
  630         return ret;
  631 }
  632 
  633 static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
  634                               int in_len, int out_len)
  635 {
  636         struct rdma_ucm_bind_ip cmd;
  637         struct ucma_context *ctx;
  638         int ret;
  639 
  640         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  641                 return -EFAULT;
  642 
  643         if (!rdma_addr_size_in6(&cmd.addr))
  644                 return -EINVAL;
  645 
  646         ctx = ucma_get_ctx(file, cmd.id);
  647         if (IS_ERR(ctx))
  648                 return PTR_ERR(ctx);
  649 
  650         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
  651         ucma_put_ctx(ctx);
  652         return ret;
  653 }
  654 
  655 static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
  656                          int in_len, int out_len)
  657 {
  658         struct rdma_ucm_bind cmd;
  659         struct ucma_context *ctx;
  660         int ret;
  661 
  662         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  663                 return -EFAULT;
  664 
  665         if (cmd.reserved || !cmd.addr_size ||
  666             cmd.addr_size != rdma_addr_size_kss(&cmd.addr))
  667                 return -EINVAL;
  668 
  669         ctx = ucma_get_ctx(file, cmd.id);
  670         if (IS_ERR(ctx))
  671                 return PTR_ERR(ctx);
  672 
  673         ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
  674         ucma_put_ctx(ctx);
  675         return ret;
  676 }
  677 
  678 static ssize_t ucma_resolve_ip(struct ucma_file *file,
  679                                const char __user *inbuf,
  680                                int in_len, int out_len)
  681 {
  682         struct rdma_ucm_resolve_ip cmd;
  683         struct ucma_context *ctx;
  684         int ret;
  685 
  686         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  687                 return -EFAULT;
  688 
  689         if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
  690             !rdma_addr_size_in6(&cmd.dst_addr))
  691                 return -EINVAL;
  692 
  693         ctx = ucma_get_ctx(file, cmd.id);
  694         if (IS_ERR(ctx))
  695                 return PTR_ERR(ctx);
  696 
  697         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
  698                                 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
  699         ucma_put_ctx(ctx);
  700         return ret;
  701 }
  702 
  703 static ssize_t ucma_resolve_addr(struct ucma_file *file,
  704                                  const char __user *inbuf,
  705                                  int in_len, int out_len)
  706 {
  707         struct rdma_ucm_resolve_addr cmd;
  708         struct ucma_context *ctx;
  709         int ret;
  710 
  711         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  712                 return -EFAULT;
  713 
  714         if (cmd.reserved ||
  715             (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) ||
  716             !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr)))
  717                 return -EINVAL;
  718 
  719         ctx = ucma_get_ctx(file, cmd.id);
  720         if (IS_ERR(ctx))
  721                 return PTR_ERR(ctx);
  722 
  723         ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
  724                                 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
  725         ucma_put_ctx(ctx);
  726         return ret;
  727 }
  728 
  729 static ssize_t ucma_resolve_route(struct ucma_file *file,
  730                                   const char __user *inbuf,
  731                                   int in_len, int out_len)
  732 {
  733         struct rdma_ucm_resolve_route cmd;
  734         struct ucma_context *ctx;
  735         int ret;
  736 
  737         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  738                 return -EFAULT;
  739 
  740         ctx = ucma_get_ctx_dev(file, cmd.id);
  741         if (IS_ERR(ctx))
  742                 return PTR_ERR(ctx);
  743 
  744         ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
  745         ucma_put_ctx(ctx);
  746         return ret;
  747 }
  748 
  749 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
  750                                struct rdma_route *route)
  751 {
  752         struct rdma_dev_addr *dev_addr;
  753 
  754         resp->num_paths = route->num_paths;
  755         switch (route->num_paths) {
  756         case 0:
  757                 dev_addr = &route->addr.dev_addr;
  758                 rdma_addr_get_dgid(dev_addr,
  759                                    (union ib_gid *) &resp->ib_route[0].dgid);
  760                 rdma_addr_get_sgid(dev_addr,
  761                                    (union ib_gid *) &resp->ib_route[0].sgid);
  762                 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
  763                 break;
  764         case 2:
  765                 ib_copy_path_rec_to_user(&resp->ib_route[1],
  766                                          &route->path_rec[1]);
  767                 /* fall through */
  768         case 1:
  769                 ib_copy_path_rec_to_user(&resp->ib_route[0],
  770                                          &route->path_rec[0]);
  771                 break;
  772         default:
  773                 break;
  774         }
  775 }
  776 
  777 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
  778                                  struct rdma_route *route)
  779 {
  780 
  781         resp->num_paths = route->num_paths;
  782         switch (route->num_paths) {
  783         case 0:
  784                 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
  785                             (union ib_gid *)&resp->ib_route[0].dgid);
  786                 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
  787                             (union ib_gid *)&resp->ib_route[0].sgid);
  788                 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
  789                 break;
  790         case 2:
  791                 ib_copy_path_rec_to_user(&resp->ib_route[1],
  792                                          &route->path_rec[1]);
  793                 /* fall through */
  794         case 1:
  795                 ib_copy_path_rec_to_user(&resp->ib_route[0],
  796                                          &route->path_rec[0]);
  797                 break;
  798         default:
  799                 break;
  800         }
  801 }
  802 
  803 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
  804                                struct rdma_route *route)
  805 {
  806         struct rdma_dev_addr *dev_addr;
  807 
  808         dev_addr = &route->addr.dev_addr;
  809         rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
  810         rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
  811 }
  812 
  813 static ssize_t ucma_query_route(struct ucma_file *file,
  814                                 const char __user *inbuf,
  815                                 int in_len, int out_len)
  816 {
  817         struct rdma_ucm_query cmd;
  818         struct rdma_ucm_query_route_resp resp;
  819         struct ucma_context *ctx;
  820         struct sockaddr *addr;
  821         int ret = 0;
  822 
  823         if (out_len < sizeof(resp))
  824                 return -ENOSPC;
  825 
  826         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  827                 return -EFAULT;
  828 
  829         ctx = ucma_get_ctx(file, cmd.id);
  830         if (IS_ERR(ctx))
  831                 return PTR_ERR(ctx);
  832 
  833         memset(&resp, 0, sizeof resp);
  834         addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
  835         memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
  836                                      sizeof(struct sockaddr_in) :
  837                                      sizeof(struct sockaddr_in6));
  838         addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
  839         memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
  840                                      sizeof(struct sockaddr_in) :
  841                                      sizeof(struct sockaddr_in6));
  842         if (!ctx->cm_id->device)
  843                 goto out;
  844 
  845         resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
  846         resp.port_num = ctx->cm_id->port_num;
  847 
  848         if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
  849                 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
  850         else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
  851                 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
  852         else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
  853                 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
  854 
  855 out:
  856         if (copy_to_user((void __user *)(unsigned long)cmd.response,
  857                          &resp, sizeof(resp)))
  858                 ret = -EFAULT;
  859 
  860         ucma_put_ctx(ctx);
  861         return ret;
  862 }
  863 
  864 static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
  865                                    struct rdma_ucm_query_addr_resp *resp)
  866 {
  867         if (!cm_id->device)
  868                 return;
  869 
  870         resp->node_guid = (__force __u64) cm_id->device->node_guid;
  871         resp->port_num = cm_id->port_num;
  872         resp->pkey = (__force __u16) cpu_to_be16(
  873                      ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
  874 }
  875 
  876 static ssize_t ucma_query_addr(struct ucma_context *ctx,
  877                                void __user *response, int out_len)
  878 {
  879         struct rdma_ucm_query_addr_resp resp;
  880         struct sockaddr *addr;
  881         int ret = 0;
  882 
  883         if (out_len < sizeof(resp))
  884                 return -ENOSPC;
  885 
  886         memset(&resp, 0, sizeof resp);
  887 
  888         addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
  889         resp.src_size = rdma_addr_size(addr);
  890         memcpy(&resp.src_addr, addr, resp.src_size);
  891 
  892         addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
  893         resp.dst_size = rdma_addr_size(addr);
  894         memcpy(&resp.dst_addr, addr, resp.dst_size);
  895 
  896         ucma_query_device_addr(ctx->cm_id, &resp);
  897 
  898         if (copy_to_user(response, &resp, sizeof(resp)))
  899                 ret = -EFAULT;
  900 
  901         return ret;
  902 }
  903 
  904 static ssize_t ucma_query_path(struct ucma_context *ctx,
  905                                void __user *response, int out_len)
  906 {
  907         struct rdma_ucm_query_path_resp *resp;
  908         int i, ret = 0;
  909 
  910         if (out_len < sizeof(*resp))
  911                 return -ENOSPC;
  912 
  913         resp = kzalloc(out_len, GFP_KERNEL);
  914         if (!resp)
  915                 return -ENOMEM;
  916 
  917         resp->num_paths = ctx->cm_id->route.num_paths;
  918         for (i = 0, out_len -= sizeof(*resp);
  919              i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
  920              i++, out_len -= sizeof(struct ib_path_rec_data)) {
  921 
  922                 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
  923                                            IB_PATH_BIDIRECTIONAL;
  924                 ib_sa_pack_path(&ctx->cm_id->route.path_rec[i],
  925                                 &resp->path_data[i].path_rec);
  926         }
  927 
  928         if (copy_to_user(response, resp,
  929                          sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
  930                 ret = -EFAULT;
  931 
  932         kfree(resp);
  933         return ret;
  934 }
  935 
  936 static ssize_t ucma_query_gid(struct ucma_context *ctx,
  937                               void __user *response, int out_len)
  938 {
  939         struct rdma_ucm_query_addr_resp resp;
  940         struct sockaddr_ib *addr;
  941         int ret = 0;
  942 
  943         if (out_len < sizeof(resp))
  944                 return -ENOSPC;
  945 
  946         memset(&resp, 0, sizeof resp);
  947 
  948         ucma_query_device_addr(ctx->cm_id, &resp);
  949 
  950         addr = (struct sockaddr_ib *) &resp.src_addr;
  951         resp.src_size = sizeof(*addr);
  952         if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
  953                 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
  954         } else {
  955                 addr->sib_family = AF_IB;
  956                 addr->sib_pkey = (__force __be16) resp.pkey;
  957                 rdma_addr_get_sgid(&ctx->cm_id->route.addr.dev_addr,
  958                                    (union ib_gid *) &addr->sib_addr);
  959                 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
  960                                                     &ctx->cm_id->route.addr.src_addr);
  961         }
  962 
  963         addr = (struct sockaddr_ib *) &resp.dst_addr;
  964         resp.dst_size = sizeof(*addr);
  965         if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
  966                 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
  967         } else {
  968                 addr->sib_family = AF_IB;
  969                 addr->sib_pkey = (__force __be16) resp.pkey;
  970                 rdma_addr_get_dgid(&ctx->cm_id->route.addr.dev_addr,
  971                                    (union ib_gid *) &addr->sib_addr);
  972                 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
  973                                                     &ctx->cm_id->route.addr.dst_addr);
  974         }
  975 
  976         if (copy_to_user(response, &resp, sizeof(resp)))
  977                 ret = -EFAULT;
  978 
  979         return ret;
  980 }
  981 
  982 static ssize_t ucma_query(struct ucma_file *file,
  983                           const char __user *inbuf,
  984                           int in_len, int out_len)
  985 {
  986         struct rdma_ucm_query cmd;
  987         struct ucma_context *ctx;
  988         void __user *response;
  989         int ret;
  990 
  991         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
  992                 return -EFAULT;
  993 
  994         response = (void __user *)(unsigned long) cmd.response;
  995         ctx = ucma_get_ctx(file, cmd.id);
  996         if (IS_ERR(ctx))
  997                 return PTR_ERR(ctx);
  998 
  999         switch (cmd.option) {
 1000         case RDMA_USER_CM_QUERY_ADDR:
 1001                 ret = ucma_query_addr(ctx, response, out_len);
 1002                 break;
 1003         case RDMA_USER_CM_QUERY_PATH:
 1004                 ret = ucma_query_path(ctx, response, out_len);
 1005                 break;
 1006         case RDMA_USER_CM_QUERY_GID:
 1007                 ret = ucma_query_gid(ctx, response, out_len);
 1008                 break;
 1009         default:
 1010                 ret = -ENOSYS;
 1011                 break;
 1012         }
 1013 
 1014         ucma_put_ctx(ctx);
 1015         return ret;
 1016 }
 1017 
 1018 static void ucma_copy_conn_param(struct rdma_cm_id *id,
 1019                                  struct rdma_conn_param *dst,
 1020                                  struct rdma_ucm_conn_param *src)
 1021 {
 1022         dst->private_data = src->private_data;
 1023         dst->private_data_len = src->private_data_len;
 1024         dst->responder_resources =src->responder_resources;
 1025         dst->initiator_depth = src->initiator_depth;
 1026         dst->flow_control = src->flow_control;
 1027         dst->retry_count = src->retry_count;
 1028         dst->rnr_retry_count = src->rnr_retry_count;
 1029         dst->srq = src->srq;
 1030         dst->qp_num = src->qp_num;
 1031         dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
 1032 }
 1033 
 1034 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 1035                             int in_len, int out_len)
 1036 {
 1037         struct rdma_ucm_connect cmd;
 1038         struct rdma_conn_param conn_param;
 1039         struct ucma_context *ctx;
 1040         int ret;
 1041 
 1042         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1043                 return -EFAULT;
 1044 
 1045         if (!cmd.conn_param.valid)
 1046                 return -EINVAL;
 1047 
 1048         ctx = ucma_get_ctx_dev(file, cmd.id);
 1049         if (IS_ERR(ctx))
 1050                 return PTR_ERR(ctx);
 1051 
 1052         ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
 1053         ret = rdma_connect(ctx->cm_id, &conn_param);
 1054         ucma_put_ctx(ctx);
 1055         return ret;
 1056 }
 1057 
 1058 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
 1059                            int in_len, int out_len)
 1060 {
 1061         struct rdma_ucm_listen cmd;
 1062         struct ucma_context *ctx;
 1063         int ret;
 1064 
 1065         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1066                 return -EFAULT;
 1067 
 1068         ctx = ucma_get_ctx(file, cmd.id);
 1069         if (IS_ERR(ctx))
 1070                 return PTR_ERR(ctx);
 1071 
 1072         ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
 1073                        cmd.backlog : max_backlog;
 1074         ret = rdma_listen(ctx->cm_id, ctx->backlog);
 1075         ucma_put_ctx(ctx);
 1076         return ret;
 1077 }
 1078 
 1079 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
 1080                            int in_len, int out_len)
 1081 {
 1082         struct rdma_ucm_accept cmd;
 1083         struct rdma_conn_param conn_param;
 1084         struct ucma_context *ctx;
 1085         int ret;
 1086 
 1087         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1088                 return -EFAULT;
 1089 
 1090         ctx = ucma_get_ctx_dev(file, cmd.id);
 1091         if (IS_ERR(ctx))
 1092                 return PTR_ERR(ctx);
 1093 
 1094         if (cmd.conn_param.valid) {
 1095                 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
 1096                 mutex_lock(&file->mut);
 1097                 ret = rdma_accept(ctx->cm_id, &conn_param);
 1098                 if (!ret)
 1099                         ctx->uid = cmd.uid;
 1100                 mutex_unlock(&file->mut);
 1101         } else
 1102                 ret = rdma_accept(ctx->cm_id, NULL);
 1103 
 1104         ucma_put_ctx(ctx);
 1105         return ret;
 1106 }
 1107 
 1108 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
 1109                            int in_len, int out_len)
 1110 {
 1111         struct rdma_ucm_reject cmd;
 1112         struct ucma_context *ctx;
 1113         int ret;
 1114 
 1115         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1116                 return -EFAULT;
 1117 
 1118         ctx = ucma_get_ctx_dev(file, cmd.id);
 1119         if (IS_ERR(ctx))
 1120                 return PTR_ERR(ctx);
 1121 
 1122         ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
 1123         ucma_put_ctx(ctx);
 1124         return ret;
 1125 }
 1126 
 1127 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
 1128                                int in_len, int out_len)
 1129 {
 1130         struct rdma_ucm_disconnect cmd;
 1131         struct ucma_context *ctx;
 1132         int ret;
 1133 
 1134         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1135                 return -EFAULT;
 1136 
 1137         ctx = ucma_get_ctx_dev(file, cmd.id);
 1138         if (IS_ERR(ctx))
 1139                 return PTR_ERR(ctx);
 1140 
 1141         ret = rdma_disconnect(ctx->cm_id);
 1142         ucma_put_ctx(ctx);
 1143         return ret;
 1144 }
 1145 
 1146 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
 1147                                  const char __user *inbuf,
 1148                                  int in_len, int out_len)
 1149 {
 1150         struct rdma_ucm_init_qp_attr cmd;
 1151         struct ib_uverbs_qp_attr resp;
 1152         struct ucma_context *ctx;
 1153         struct ib_qp_attr qp_attr;
 1154         int ret;
 1155 
 1156         if (out_len < sizeof(resp))
 1157                 return -ENOSPC;
 1158 
 1159         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1160                 return -EFAULT;
 1161 
 1162         ctx = ucma_get_ctx_dev(file, cmd.id);
 1163         if (IS_ERR(ctx))
 1164                 return PTR_ERR(ctx);
 1165 
 1166         resp.qp_attr_mask = 0;
 1167         memset(&qp_attr, 0, sizeof qp_attr);
 1168         qp_attr.qp_state = cmd.qp_state;
 1169         ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
 1170         if (ret)
 1171                 goto out;
 1172 
 1173         ib_copy_qp_attr_to_user(&resp, &qp_attr);
 1174         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 1175                          &resp, sizeof(resp)))
 1176                 ret = -EFAULT;
 1177 
 1178 out:
 1179         ucma_put_ctx(ctx);
 1180         return ret;
 1181 }
 1182 
 1183 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
 1184                               void *optval, size_t optlen)
 1185 {
 1186         int ret = 0;
 1187 
 1188         switch (optname) {
 1189         case RDMA_OPTION_ID_TOS:
 1190                 if (optlen != sizeof(u8)) {
 1191                         ret = -EINVAL;
 1192                         break;
 1193                 }
 1194                 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
 1195                 break;
 1196         case RDMA_OPTION_ID_REUSEADDR:
 1197                 if (optlen != sizeof(int)) {
 1198                         ret = -EINVAL;
 1199                         break;
 1200                 }
 1201                 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
 1202                 break;
 1203         case RDMA_OPTION_ID_AFONLY:
 1204                 if (optlen != sizeof(int)) {
 1205                         ret = -EINVAL;
 1206                         break;
 1207                 }
 1208                 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
 1209                 break;
 1210         case RDMA_OPTION_ID_ACK_TIMEOUT:
 1211                 if (optlen != sizeof(u8)) {
 1212                         ret = -EINVAL;
 1213                         break;
 1214                 }
 1215                 ret = rdma_set_ack_timeout(ctx->cm_id, *((u8 *)optval));
 1216                 break;
 1217         default:
 1218                 ret = -ENOSYS;
 1219         }
 1220 
 1221         return ret;
 1222 }
 1223 
 1224 static int ucma_set_ib_path(struct ucma_context *ctx,
 1225                             struct ib_path_rec_data *path_data, size_t optlen)
 1226 {
 1227         struct ib_sa_path_rec sa_path;
 1228         struct rdma_cm_event event;
 1229         int ret;
 1230 
 1231         if (optlen % sizeof(*path_data))
 1232                 return -EINVAL;
 1233 
 1234         for (; optlen; optlen -= sizeof(*path_data), path_data++) {
 1235                 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
 1236                                          IB_PATH_BIDIRECTIONAL))
 1237                         break;
 1238         }
 1239 
 1240         if (!optlen)
 1241                 return -EINVAL;
 1242 
 1243         memset(&sa_path, 0, sizeof(sa_path));
 1244 
 1245         ib_sa_unpack_path(path_data->path_rec, &sa_path);
 1246         ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
 1247         if (ret)
 1248                 return ret;
 1249 
 1250         memset(&event, 0, sizeof event);
 1251         event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
 1252         return ucma_event_handler(ctx->cm_id, &event);
 1253 }
 1254 
 1255 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
 1256                               void *optval, size_t optlen)
 1257 {
 1258         int ret;
 1259 
 1260         switch (optname) {
 1261         case RDMA_OPTION_IB_PATH:
 1262                 ret = ucma_set_ib_path(ctx, optval, optlen);
 1263                 break;
 1264         default:
 1265                 ret = -ENOSYS;
 1266         }
 1267 
 1268         return ret;
 1269 }
 1270 
 1271 static int ucma_set_option_level(struct ucma_context *ctx, int level,
 1272                                  int optname, void *optval, size_t optlen)
 1273 {
 1274         int ret;
 1275 
 1276         switch (level) {
 1277         case RDMA_OPTION_ID:
 1278                 ret = ucma_set_option_id(ctx, optname, optval, optlen);
 1279                 break;
 1280         case RDMA_OPTION_IB:
 1281                 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
 1282                 break;
 1283         default:
 1284                 ret = -ENOSYS;
 1285         }
 1286 
 1287         return ret;
 1288 }
 1289 
 1290 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
 1291                                int in_len, int out_len)
 1292 {
 1293         struct rdma_ucm_set_option cmd;
 1294         struct ucma_context *ctx;
 1295         void *optval;
 1296         int ret;
 1297 
 1298         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1299                 return -EFAULT;
 1300 
 1301         ctx = ucma_get_ctx(file, cmd.id);
 1302         if (IS_ERR(ctx))
 1303                 return PTR_ERR(ctx);
 1304 
 1305         optval = memdup_user((void __user *) (unsigned long) cmd.optval,
 1306                              cmd.optlen);
 1307         if (IS_ERR(optval)) {
 1308                 ret = PTR_ERR(optval);
 1309                 goto out;
 1310         }
 1311 
 1312         ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
 1313                                     cmd.optlen);
 1314         kfree(optval);
 1315 
 1316 out:
 1317         ucma_put_ctx(ctx);
 1318         return ret;
 1319 }
 1320 
 1321 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
 1322                            int in_len, int out_len)
 1323 {
 1324         struct rdma_ucm_notify cmd;
 1325         struct ucma_context *ctx;
 1326         int ret;
 1327 
 1328         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1329                 return -EFAULT;
 1330 
 1331         ctx = ucma_get_ctx(file, cmd.id);
 1332         if (IS_ERR(ctx))
 1333                 return PTR_ERR(ctx);
 1334 
 1335         ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
 1336         ucma_put_ctx(ctx);
 1337         return ret;
 1338 }
 1339 
 1340 static ssize_t ucma_process_join(struct ucma_file *file,
 1341                                  struct rdma_ucm_join_mcast *cmd,  int out_len)
 1342 {
 1343         struct rdma_ucm_create_id_resp resp;
 1344         struct ucma_context *ctx;
 1345         struct ucma_multicast *mc;
 1346         struct sockaddr *addr;
 1347         int ret;
 1348         u8 join_state;
 1349 
 1350         if (out_len < sizeof(resp))
 1351                 return -ENOSPC;
 1352 
 1353         addr = (struct sockaddr *) &cmd->addr;
 1354         if (!cmd->addr_size || (cmd->addr_size != rdma_addr_size(addr)))
 1355                 return -EINVAL;
 1356 
 1357         if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
 1358                 join_state = BIT(FULLMEMBER_JOIN);
 1359         else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
 1360                 join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
 1361         else
 1362                 return -EINVAL;
 1363 
 1364         ctx = ucma_get_ctx_dev(file, cmd->id);
 1365         if (IS_ERR(ctx))
 1366                 return PTR_ERR(ctx);
 1367 
 1368         mutex_lock(&file->mut);
 1369         mc = ucma_alloc_multicast(ctx);
 1370         if (!mc) {
 1371                 ret = -ENOMEM;
 1372                 goto err1;
 1373         }
 1374         mc->join_state = join_state;
 1375         mc->uid = cmd->uid;
 1376         memcpy(&mc->addr, addr, cmd->addr_size);
 1377         ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
 1378                                   join_state, mc);
 1379         if (ret)
 1380                 goto err2;
 1381 
 1382         resp.id = mc->id;
 1383         if (copy_to_user((void __user *)(unsigned long) cmd->response,
 1384                          &resp, sizeof(resp))) {
 1385                 ret = -EFAULT;
 1386                 goto err3;
 1387         }
 1388 
 1389         mutex_unlock(&file->mut);
 1390         ucma_put_ctx(ctx);
 1391         return 0;
 1392 
 1393 err3:
 1394         rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
 1395         ucma_cleanup_mc_events(mc);
 1396 err2:
 1397         mutex_lock(&mut);
 1398         idr_remove(&multicast_idr, mc->id);
 1399         mutex_unlock(&mut);
 1400         list_del(&mc->list);
 1401         kfree(mc);
 1402 err1:
 1403         mutex_unlock(&file->mut);
 1404         ucma_put_ctx(ctx);
 1405         return ret;
 1406 }
 1407 
 1408 static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
 1409                                       const char __user *inbuf,
 1410                                       int in_len, int out_len)
 1411 {
 1412         struct rdma_ucm_join_ip_mcast cmd;
 1413         struct rdma_ucm_join_mcast join_cmd;
 1414 
 1415         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1416                 return -EFAULT;
 1417 
 1418         join_cmd.response = cmd.response;
 1419         join_cmd.uid = cmd.uid;
 1420         join_cmd.id = cmd.id;
 1421         join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr);
 1422         join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
 1423         memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
 1424 
 1425         return ucma_process_join(file, &join_cmd, out_len);
 1426 }
 1427 
 1428 static ssize_t ucma_join_multicast(struct ucma_file *file,
 1429                                    const char __user *inbuf,
 1430                                    int in_len, int out_len)
 1431 {
 1432         struct rdma_ucm_join_mcast cmd;
 1433 
 1434         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1435                 return -EFAULT;
 1436 
 1437         if (!rdma_addr_size_kss(&cmd.addr))
 1438                 return -EINVAL;
 1439 
 1440         return ucma_process_join(file, &cmd, out_len);
 1441 }
 1442 
 1443 static ssize_t ucma_leave_multicast(struct ucma_file *file,
 1444                                     const char __user *inbuf,
 1445                                     int in_len, int out_len)
 1446 {
 1447         struct rdma_ucm_destroy_id cmd;
 1448         struct rdma_ucm_destroy_id_resp resp;
 1449         struct ucma_multicast *mc;
 1450         int ret = 0;
 1451 
 1452         if (out_len < sizeof(resp))
 1453                 return -ENOSPC;
 1454 
 1455         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1456                 return -EFAULT;
 1457 
 1458         mutex_lock(&mut);
 1459         mc = idr_find(&multicast_idr, cmd.id);
 1460         if (!mc)
 1461                 mc = ERR_PTR(-ENOENT);
 1462         else if (mc->ctx->file != file)
 1463                 mc = ERR_PTR(-EINVAL);
 1464         else if (!atomic_inc_not_zero(&mc->ctx->ref))
 1465                 mc = ERR_PTR(-ENXIO);
 1466         else
 1467                 idr_remove(&multicast_idr, mc->id);
 1468         mutex_unlock(&mut);
 1469 
 1470         if (IS_ERR(mc)) {
 1471                 ret = PTR_ERR(mc);
 1472                 goto out;
 1473         }
 1474 
 1475         rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
 1476         mutex_lock(&mc->ctx->file->mut);
 1477         ucma_cleanup_mc_events(mc);
 1478         list_del(&mc->list);
 1479         mutex_unlock(&mc->ctx->file->mut);
 1480 
 1481         ucma_put_ctx(mc->ctx);
 1482         resp.events_reported = mc->events_reported;
 1483         kfree(mc);
 1484 
 1485         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 1486                          &resp, sizeof(resp)))
 1487                 ret = -EFAULT;
 1488 out:
 1489         return ret;
 1490 }
 1491 
 1492 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
 1493 {
 1494         /* Acquire mutex's based on pointer comparison to prevent deadlock. */
 1495         if (file1 < file2) {
 1496                 mutex_lock(&file1->mut);
 1497                 mutex_lock_nested(&file2->mut, SINGLE_DEPTH_NESTING);
 1498         } else {
 1499                 mutex_lock(&file2->mut);
 1500                 mutex_lock_nested(&file1->mut, SINGLE_DEPTH_NESTING);
 1501         }
 1502 }
 1503 
 1504 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
 1505 {
 1506         if (file1 < file2) {
 1507                 mutex_unlock(&file2->mut);
 1508                 mutex_unlock(&file1->mut);
 1509         } else {
 1510                 mutex_unlock(&file1->mut);
 1511                 mutex_unlock(&file2->mut);
 1512         }
 1513 }
 1514 
 1515 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
 1516 {
 1517         struct ucma_event *uevent, *tmp;
 1518 
 1519         list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
 1520                 if (uevent->ctx == ctx)
 1521                         list_move_tail(&uevent->list, &file->event_list);
 1522 }
 1523 
 1524 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
 1525                                const char __user *inbuf,
 1526                                int in_len, int out_len)
 1527 {
 1528         struct rdma_ucm_migrate_id cmd;
 1529         struct rdma_ucm_migrate_resp resp;
 1530         struct ucma_context *ctx;
 1531         struct fd f;
 1532         struct ucma_file *cur_file;
 1533         int ret = 0;
 1534 
 1535         if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
 1536                 return -EFAULT;
 1537 
 1538         /* Get current fd to protect against it being closed */
 1539         f = fdget(cmd.fd);
 1540         if (!f.file)
 1541                 return -ENOENT;
 1542 
 1543         /* Validate current fd and prevent destruction of id. */
 1544         ctx = ucma_get_ctx(f.file->private_data, cmd.id);
 1545         if (IS_ERR(ctx)) {
 1546                 ret = PTR_ERR(ctx);
 1547                 goto file_put;
 1548         }
 1549 
 1550         cur_file = ctx->file;
 1551         if (cur_file == new_file) {
 1552                 resp.events_reported = ctx->events_reported;
 1553                 goto response;
 1554         }
 1555 
 1556         /*
 1557          * Migrate events between fd's, maintaining order, and avoiding new
 1558          * events being added before existing events.
 1559          */
 1560         ucma_lock_files(cur_file, new_file);
 1561         mutex_lock(&mut);
 1562 
 1563         list_move_tail(&ctx->list, &new_file->ctx_list);
 1564         ucma_move_events(ctx, new_file);
 1565         ctx->file = new_file;
 1566         resp.events_reported = ctx->events_reported;
 1567 
 1568         mutex_unlock(&mut);
 1569         ucma_unlock_files(cur_file, new_file);
 1570 
 1571 response:
 1572         if (copy_to_user((void __user *)(unsigned long)cmd.response,
 1573                          &resp, sizeof(resp)))
 1574                 ret = -EFAULT;
 1575 
 1576         ucma_put_ctx(ctx);
 1577 file_put:
 1578         fdput(f);
 1579         return ret;
 1580 }
 1581 
 1582 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
 1583                                    const char __user *inbuf,
 1584                                    int in_len, int out_len) = {
 1585         [RDMA_USER_CM_CMD_CREATE_ID]     = ucma_create_id,
 1586         [RDMA_USER_CM_CMD_DESTROY_ID]    = ucma_destroy_id,
 1587         [RDMA_USER_CM_CMD_BIND_IP]       = ucma_bind_ip,
 1588         [RDMA_USER_CM_CMD_RESOLVE_IP]    = ucma_resolve_ip,
 1589         [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
 1590         [RDMA_USER_CM_CMD_QUERY_ROUTE]   = ucma_query_route,
 1591         [RDMA_USER_CM_CMD_CONNECT]       = ucma_connect,
 1592         [RDMA_USER_CM_CMD_LISTEN]        = ucma_listen,
 1593         [RDMA_USER_CM_CMD_ACCEPT]        = ucma_accept,
 1594         [RDMA_USER_CM_CMD_REJECT]        = ucma_reject,
 1595         [RDMA_USER_CM_CMD_DISCONNECT]    = ucma_disconnect,
 1596         [RDMA_USER_CM_CMD_INIT_QP_ATTR]  = ucma_init_qp_attr,
 1597         [RDMA_USER_CM_CMD_GET_EVENT]     = ucma_get_event,
 1598         [RDMA_USER_CM_CMD_GET_OPTION]    = NULL,
 1599         [RDMA_USER_CM_CMD_SET_OPTION]    = ucma_set_option,
 1600         [RDMA_USER_CM_CMD_NOTIFY]        = ucma_notify,
 1601         [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
 1602         [RDMA_USER_CM_CMD_LEAVE_MCAST]   = ucma_leave_multicast,
 1603         [RDMA_USER_CM_CMD_MIGRATE_ID]    = ucma_migrate_id,
 1604         [RDMA_USER_CM_CMD_QUERY]         = ucma_query,
 1605         [RDMA_USER_CM_CMD_BIND]          = ucma_bind,
 1606         [RDMA_USER_CM_CMD_RESOLVE_ADDR]  = ucma_resolve_addr,
 1607         [RDMA_USER_CM_CMD_JOIN_MCAST]    = ucma_join_multicast
 1608 };
 1609 
 1610 static ssize_t ucma_write(struct file *filp, const char __user *buf,
 1611                           size_t len, loff_t *pos)
 1612 {
 1613         struct ucma_file *file = filp->private_data;
 1614         struct rdma_ucm_cmd_hdr hdr;
 1615         ssize_t ret;
 1616 
 1617         if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
 1618                 return -EACCES;
 1619 
 1620         if (len < sizeof(hdr))
 1621                 return -EINVAL;
 1622 
 1623         if (copy_from_user(&hdr, buf, sizeof(hdr)))
 1624                 return -EFAULT;
 1625 
 1626         if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
 1627                 return -EINVAL;
 1628 
 1629         if (hdr.in + sizeof(hdr) > len)
 1630                 return -EINVAL;
 1631 
 1632         if (!ucma_cmd_table[hdr.cmd])
 1633                 return -ENOSYS;
 1634 
 1635         ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
 1636         if (!ret)
 1637                 ret = len;
 1638 
 1639         return ret;
 1640 }
 1641 
 1642 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
 1643 {
 1644         struct ucma_file *file = filp->private_data;
 1645         unsigned int mask = 0;
 1646 
 1647         poll_wait(filp, &file->poll_wait, wait);
 1648 
 1649         if (!list_empty(&file->event_list))
 1650                 mask = POLLIN | POLLRDNORM;
 1651 
 1652         return mask;
 1653 }
 1654 
 1655 /*
 1656  * ucma_open() does not need the BKL:
 1657  *
 1658  *  - no global state is referred to;
 1659  *  - there is no ioctl method to race against;
 1660  *  - no further module initialization is required for open to work
 1661  *    after the device is registered.
 1662  */
 1663 static int ucma_open(struct inode *inode, struct file *filp)
 1664 {
 1665         struct ucma_file *file;
 1666 
 1667         file = kmalloc(sizeof *file, GFP_KERNEL);
 1668         if (!file)
 1669                 return -ENOMEM;
 1670 
 1671         file->close_wq = alloc_ordered_workqueue("ucma_close_id",
 1672                                                  WQ_MEM_RECLAIM);
 1673         if (!file->close_wq) {
 1674                 kfree(file);
 1675                 return -ENOMEM;
 1676         }
 1677 
 1678         INIT_LIST_HEAD(&file->event_list);
 1679         INIT_LIST_HEAD(&file->ctx_list);
 1680         init_waitqueue_head(&file->poll_wait);
 1681         mutex_init(&file->mut);
 1682 
 1683         filp->private_data = file;
 1684         file->filp = filp;
 1685 
 1686         return nonseekable_open(inode, filp);
 1687 }
 1688 
 1689 static int ucma_close(struct inode *inode, struct file *filp)
 1690 {
 1691         struct ucma_file *file = filp->private_data;
 1692         struct ucma_context *ctx, *tmp;
 1693 
 1694         mutex_lock(&file->mut);
 1695         list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
 1696                 ctx->destroying = 1;
 1697                 mutex_unlock(&file->mut);
 1698 
 1699                 mutex_lock(&mut);
 1700                 idr_remove(&ctx_idr, ctx->id);
 1701                 mutex_unlock(&mut);
 1702 
 1703                 flush_workqueue(file->close_wq);
 1704                 /* At that step once ctx was marked as destroying and workqueue
 1705                  * was flushed we are safe from any inflights handlers that
 1706                  * might put other closing task.
 1707                  */
 1708                 mutex_lock(&mut);
 1709                 if (!ctx->closing) {
 1710                         mutex_unlock(&mut);
 1711                         ucma_put_ctx(ctx);
 1712                         wait_for_completion(&ctx->comp);
 1713                         /* rdma_destroy_id ensures that no event handlers are
 1714                          * inflight for that id before releasing it.
 1715                          */
 1716                         rdma_destroy_id(ctx->cm_id);
 1717                 } else {
 1718                         mutex_unlock(&mut);
 1719                 }
 1720 
 1721                 ucma_free_ctx(ctx);
 1722                 mutex_lock(&file->mut);
 1723         }
 1724         mutex_unlock(&file->mut);
 1725         destroy_workqueue(file->close_wq);
 1726         kfree(file);
 1727         return 0;
 1728 }
 1729 
 1730 static long
 1731 ucma_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 1732 {
 1733 
 1734         switch (cmd) {
 1735         case FIONBIO:
 1736         case FIOASYNC:
 1737                 return (0);
 1738         default:
 1739                 return (-ENOTTY);
 1740         }
 1741 }
 1742 
 1743 static const struct file_operations ucma_fops = {
 1744         .owner   = THIS_MODULE,
 1745         .open    = ucma_open,
 1746         .release = ucma_close,
 1747         .write   = ucma_write,
 1748         .unlocked_ioctl = ucma_ioctl,
 1749         .poll    = ucma_poll,
 1750         .llseek  = no_llseek,
 1751 };
 1752 
 1753 static struct miscdevice ucma_misc = {
 1754         .minor          = MISC_DYNAMIC_MINOR,
 1755         .name           = "rdma_cm",
 1756         .nodename       = "infiniband/rdma_cm",
 1757         .mode           = 0666,
 1758         .fops           = &ucma_fops,
 1759 };
 1760 
 1761 static ssize_t show_abi_version(struct device *dev,
 1762                                 struct device_attribute *attr,
 1763                                 char *buf)
 1764 {
 1765         return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
 1766 }
 1767 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 1768 
 1769 static int __init ucma_init(void)
 1770 {
 1771         int ret;
 1772 
 1773         ret = misc_register(&ucma_misc);
 1774         if (ret)
 1775                 return ret;
 1776 
 1777         ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
 1778         if (ret) {
 1779                 pr_err("rdma_ucm: couldn't create abi_version attr\n");
 1780                 goto err1;
 1781         }
 1782 
 1783         return 0;
 1784 err1:
 1785         misc_deregister(&ucma_misc);
 1786         return ret;
 1787 }
 1788 
 1789 static void __exit ucma_cleanup(void)
 1790 {
 1791         device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
 1792         misc_deregister(&ucma_misc);
 1793         idr_destroy(&ctx_idr);
 1794         idr_destroy(&multicast_idr);
 1795 }
 1796 
 1797 module_init_order(ucma_init, SI_ORDER_FIFTH);
 1798 module_exit_order(ucma_cleanup, SI_ORDER_FIFTH);
Cache object: 9d33694880fbb9e5b31fc38767a45455
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FreeBSD/Linux Kernel Cross Reference sys/ofed/drivers/infiniband/core/ib_ucma.c

FreeBSD/Linux Kernel Cross Reference
sys/ofed/drivers/infiniband/core/ib_ucma.c
