The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/ofed/drivers/infiniband/core/ib_user_mad.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
    3  *
    4  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
    5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
    6  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
    7  * Copyright (c) 2008 Cisco. All rights reserved.
    8  *
    9  * This software is available to you under a choice of one of two
   10  * licenses.  You may choose to be licensed under the terms of the GNU
   11  * General Public License (GPL) Version 2, available from the file
   12  * COPYING in the main directory of this source tree, or the
   13  * OpenIB.org BSD license below:
   14  *
   15  *     Redistribution and use in source and binary forms, with or
   16  *     without modification, are permitted provided that the following
   17  *     conditions are met:
   18  *
   19  *      - Redistributions of source code must retain the above
   20  *        copyright notice, this list of conditions and the following
   21  *        disclaimer.
   22  *
   23  *      - Redistributions in binary form must reproduce the above
   24  *        copyright notice, this list of conditions and the following
   25  *        disclaimer in the documentation and/or other materials
   26  *        provided with the distribution.
   27  *
   28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   35  * SOFTWARE.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #define pr_fmt(fmt) "user_mad: " fmt
   42 
   43 #include <linux/module.h>
   44 #include <linux/device.h>
   45 #include <linux/err.h>
   46 #include <linux/fs.h>
   47 #include <linux/cdev.h>
   48 #include <linux/dma-mapping.h>
   49 #include <linux/poll.h>
   50 #include <linux/mutex.h>
   51 #include <linux/kref.h>
   52 #include <linux/compat.h>
   53 #include <linux/sched.h>
   54 #include <linux/semaphore.h>
   55 #include <linux/slab.h>
   56 
   57 #include <asm/uaccess.h>
   58 
   59 #include <rdma/ib_mad.h>
   60 #include <rdma/ib_user_mad.h>
   61 
   62 MODULE_AUTHOR("Roland Dreier");
   63 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
   64 MODULE_LICENSE("Dual BSD/GPL");
   65 
   66 enum {
   67         IB_UMAD_MAX_PORTS  = 64,
   68         IB_UMAD_MAX_AGENTS = 32,
   69 
   70         IB_UMAD_MAJOR      = 231,
   71         IB_UMAD_MINOR_BASE = 0
   72 };
   73 
   74 /*
   75  * Our lifetime rules for these structs are the following:
   76  * device special file is opened, we take a reference on the
   77  * ib_umad_port's struct ib_umad_device. We drop these
   78  * references in the corresponding close().
   79  *
   80  * In addition to references coming from open character devices, there
   81  * is one more reference to each ib_umad_device representing the
   82  * module's reference taken when allocating the ib_umad_device in
   83  * ib_umad_add_one().
   84  *
   85  * When destroying an ib_umad_device, we drop the module's reference.
   86  */
   87 
   88 struct ib_umad_port {
   89         struct cdev           cdev;
   90         struct device         *dev;
   91 
   92         struct cdev           sm_cdev;
   93         struct device         *sm_dev;
   94         struct semaphore       sm_sem;
   95 
   96         struct mutex           file_mutex;
   97         struct list_head       file_list;
   98 
   99         struct ib_device      *ib_dev;
  100         struct ib_umad_device *umad_dev;
  101         int                    dev_num;
  102         u8                     port_num;
  103 };
  104 
  105 struct ib_umad_device {
  106         struct kobject       kobj;
  107         struct ib_umad_port  port[0];
  108 };
  109 
  110 struct ib_umad_file {
  111         struct mutex            mutex;
  112         struct ib_umad_port    *port;
  113         struct list_head        recv_list;
  114         struct list_head        send_list;
  115         struct list_head        port_list;
  116         spinlock_t              send_lock;
  117         wait_queue_head_t       recv_wait;
  118         struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
  119         int                     agents_dead;
  120         u8                      use_pkey_index;
  121         u8                      already_used;
  122 };
  123 
  124 struct ib_umad_packet {
  125         struct ib_mad_send_buf *msg;
  126         struct ib_mad_recv_wc  *recv_wc;
  127         struct list_head   list;
  128         int                length;
  129         struct ib_user_mad mad;
  130 };
  131 
  132 static struct class *umad_class;
  133 
  134 #define base_dev MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE)
  135 
  136 static DEFINE_SPINLOCK(port_lock);
  137 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
  138 
  139 static void ib_umad_add_one(struct ib_device *device);
  140 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
  141 
  142 static void ib_umad_release_dev(struct kobject *kobj)
  143 {
  144         struct ib_umad_device *dev =
  145                 container_of(kobj, struct ib_umad_device, kobj);
  146 
  147         kfree(dev);
  148 }
  149 
  150 static struct kobj_type ib_umad_dev_ktype = {
  151         .release = ib_umad_release_dev,
  152 };
  153 
  154 static int hdr_size(struct ib_umad_file *file)
  155 {
  156         return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
  157                 sizeof (struct ib_user_mad_hdr_old);
  158 }
  159 
  160 /* caller must hold file->mutex */
  161 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
  162 {
  163         return file->agents_dead ? NULL : file->agent[id];
  164 }
  165 
  166 static int queue_packet(struct ib_umad_file *file,
  167                         struct ib_mad_agent *agent,
  168                         struct ib_umad_packet *packet)
  169 {
  170         int ret = 1;
  171 
  172         mutex_lock(&file->mutex);
  173 
  174         for (packet->mad.hdr.id = 0;
  175              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
  176              packet->mad.hdr.id++)
  177                 if (agent == __get_agent(file, packet->mad.hdr.id)) {
  178                         list_add_tail(&packet->list, &file->recv_list);
  179                         wake_up_interruptible(&file->recv_wait);
  180                         ret = 0;
  181                         break;
  182                 }
  183 
  184         mutex_unlock(&file->mutex);
  185 
  186         return ret;
  187 }
  188 
  189 static void dequeue_send(struct ib_umad_file *file,
  190                          struct ib_umad_packet *packet)
  191 {
  192         spin_lock_irq(&file->send_lock);
  193         list_del(&packet->list);
  194         spin_unlock_irq(&file->send_lock);
  195 }
  196 
  197 static void send_handler(struct ib_mad_agent *agent,
  198                          struct ib_mad_send_wc *send_wc)
  199 {
  200         struct ib_umad_file *file = agent->context;
  201         struct ib_umad_packet *packet = send_wc->send_buf->context[0];
  202 
  203         dequeue_send(file, packet);
  204         ib_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
  205         ib_free_send_mad(packet->msg);
  206 
  207         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
  208                 packet->length = IB_MGMT_MAD_HDR;
  209                 packet->mad.hdr.status = ETIMEDOUT;
  210                 if (!queue_packet(file, agent, packet))
  211                         return;
  212         }
  213         kfree(packet);
  214 }
  215 
  216 static void recv_handler(struct ib_mad_agent *agent,
  217                          struct ib_mad_send_buf *send_buf,
  218                          struct ib_mad_recv_wc *mad_recv_wc)
  219 {
  220         struct ib_umad_file *file = agent->context;
  221         struct ib_umad_packet *packet;
  222 
  223         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
  224                 goto err1;
  225 
  226         packet = kzalloc(sizeof *packet, GFP_KERNEL);
  227         if (!packet)
  228                 goto err1;
  229 
  230         packet->length = mad_recv_wc->mad_len;
  231         packet->recv_wc = mad_recv_wc;
  232 
  233         packet->mad.hdr.status     = 0;
  234         packet->mad.hdr.length     = hdr_size(file) + mad_recv_wc->mad_len;
  235         packet->mad.hdr.qpn        = cpu_to_be32(mad_recv_wc->wc->src_qp);
  236         packet->mad.hdr.lid        = cpu_to_be16(mad_recv_wc->wc->slid);
  237         packet->mad.hdr.sl         = mad_recv_wc->wc->sl;
  238         packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
  239         packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
  240         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
  241         if (packet->mad.hdr.grh_present) {
  242                 struct ib_ah_attr ah_attr;
  243                 int ret;
  244 
  245                 ret = ib_init_ah_from_wc(agent->device, agent->port_num,
  246                                          mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
  247                                          &ah_attr);
  248                 if (ret)
  249                         goto err2;
  250 
  251                 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
  252                 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
  253                 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
  254                 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
  255                 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
  256         }
  257 
  258         if (queue_packet(file, agent, packet))
  259                 goto err2;
  260         return;
  261 
  262 err2:
  263         kfree(packet);
  264 err1:
  265         ib_free_recv_mad(mad_recv_wc);
  266 }
  267 
  268 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
  269                              struct ib_umad_packet *packet, size_t count)
  270 {
  271         struct ib_mad_recv_buf *recv_buf;
  272         int left, seg_payload, offset, max_seg_payload;
  273         size_t seg_size;
  274 
  275         recv_buf = &packet->recv_wc->recv_buf;
  276         seg_size = packet->recv_wc->mad_seg_size;
  277 
  278         /* We need enough room to copy the first (or only) MAD segment. */
  279         if ((packet->length <= seg_size &&
  280              count < hdr_size(file) + packet->length) ||
  281             (packet->length > seg_size &&
  282              count < hdr_size(file) + seg_size))
  283                 return -EINVAL;
  284 
  285         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
  286                 return -EFAULT;
  287 
  288         buf += hdr_size(file);
  289         seg_payload = min_t(int, packet->length, seg_size);
  290         if (copy_to_user(buf, recv_buf->mad, seg_payload))
  291                 return -EFAULT;
  292 
  293         if (seg_payload < packet->length) {
  294                 /*
  295                  * Multipacket RMPP MAD message. Copy remainder of message.
  296                  * Note that last segment may have a shorter payload.
  297                  */
  298                 if (count < hdr_size(file) + packet->length) {
  299                         /*
  300                          * The buffer is too small, return the first RMPP segment,
  301                          * which includes the RMPP message length.
  302                          */
  303                         return -ENOSPC;
  304                 }
  305                 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
  306                 max_seg_payload = seg_size - offset;
  307 
  308                 for (left = packet->length - seg_payload, buf += seg_payload;
  309                      left; left -= seg_payload, buf += seg_payload) {
  310                         recv_buf = container_of(recv_buf->list.next,
  311                                                 struct ib_mad_recv_buf, list);
  312                         seg_payload = min(left, max_seg_payload);
  313                         if (copy_to_user(buf, (char *)recv_buf->mad + offset,
  314                                          seg_payload))
  315                                 return -EFAULT;
  316                 }
  317         }
  318         return hdr_size(file) + packet->length;
  319 }
  320 
  321 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
  322                              struct ib_umad_packet *packet, size_t count)
  323 {
  324         ssize_t size = hdr_size(file) + packet->length;
  325 
  326         if (count < size)
  327                 return -EINVAL;
  328 
  329         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
  330                 return -EFAULT;
  331 
  332         buf += hdr_size(file);
  333 
  334         if (copy_to_user(buf, packet->mad.data, packet->length))
  335                 return -EFAULT;
  336 
  337         return size;
  338 }
  339 
  340 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
  341                             size_t count, loff_t *pos)
  342 {
  343         struct ib_umad_file *file = filp->private_data;
  344         struct ib_umad_packet *packet;
  345         ssize_t ret;
  346 
  347         if (count < hdr_size(file))
  348                 return -EINVAL;
  349 
  350         mutex_lock(&file->mutex);
  351 
  352         while (list_empty(&file->recv_list)) {
  353                 mutex_unlock(&file->mutex);
  354 
  355                 if (filp->f_flags & O_NONBLOCK)
  356                         return -EAGAIN;
  357 
  358                 if (wait_event_interruptible(file->recv_wait,
  359                                              !list_empty(&file->recv_list)))
  360                         return -ERESTARTSYS;
  361 
  362                 mutex_lock(&file->mutex);
  363         }
  364 
  365         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
  366         list_del(&packet->list);
  367 
  368         mutex_unlock(&file->mutex);
  369 
  370         if (packet->recv_wc)
  371                 ret = copy_recv_mad(file, buf, packet, count);
  372         else
  373                 ret = copy_send_mad(file, buf, packet, count);
  374 
  375         if (ret < 0) {
  376                 /* Requeue packet */
  377                 mutex_lock(&file->mutex);
  378                 list_add(&packet->list, &file->recv_list);
  379                 mutex_unlock(&file->mutex);
  380         } else {
  381                 if (packet->recv_wc)
  382                         ib_free_recv_mad(packet->recv_wc);
  383                 kfree(packet);
  384         }
  385         return ret;
  386 }
  387 
  388 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
  389 {
  390         int left, seg;
  391 
  392         /* Copy class specific header */
  393         if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
  394             copy_from_user((char *)msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
  395                            msg->hdr_len - IB_MGMT_RMPP_HDR))
  396                 return -EFAULT;
  397 
  398         /* All headers are in place.  Copy data segments. */
  399         for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
  400              seg++, left -= msg->seg_size, buf += msg->seg_size) {
  401                 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
  402                                    min(left, msg->seg_size)))
  403                         return -EFAULT;
  404         }
  405         return 0;
  406 }
  407 
  408 static int same_destination(struct ib_user_mad_hdr *hdr1,
  409                             struct ib_user_mad_hdr *hdr2)
  410 {
  411         if (!hdr1->grh_present && !hdr2->grh_present)
  412            return (hdr1->lid == hdr2->lid);
  413 
  414         if (hdr1->grh_present && hdr2->grh_present)
  415            return !memcmp(hdr1->gid, hdr2->gid, 16);
  416 
  417         return 0;
  418 }
  419 
  420 static int is_duplicate(struct ib_umad_file *file,
  421                         struct ib_umad_packet *packet)
  422 {
  423         struct ib_umad_packet *sent_packet;
  424         struct ib_mad_hdr *sent_hdr, *hdr;
  425 
  426         hdr = (struct ib_mad_hdr *) packet->mad.data;
  427         list_for_each_entry(sent_packet, &file->send_list, list) {
  428                 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
  429 
  430                 if ((hdr->tid != sent_hdr->tid) ||
  431                     (hdr->mgmt_class != sent_hdr->mgmt_class))
  432                         continue;
  433 
  434                 /*
  435                  * No need to be overly clever here.  If two new operations have
  436                  * the same TID, reject the second as a duplicate.  This is more
  437                  * restrictive than required by the spec.
  438                  */
  439                 if (!ib_response_mad(hdr)) {
  440                         if (!ib_response_mad(sent_hdr))
  441                                 return 1;
  442                         continue;
  443                 } else if (!ib_response_mad(sent_hdr))
  444                         continue;
  445 
  446                 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
  447                         return 1;
  448         }
  449 
  450         return 0;
  451 }
  452 
  453 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
  454                              size_t count, loff_t *pos)
  455 {
  456         struct ib_umad_file *file = filp->private_data;
  457         struct ib_umad_packet *packet;
  458         struct ib_mad_agent *agent;
  459         struct ib_ah_attr ah_attr;
  460         struct ib_ah *ah;
  461         struct ib_rmpp_mad *rmpp_mad;
  462         __be64 *tid;
  463         int ret, data_len, hdr_len, copy_offset, rmpp_active;
  464         u8 base_version;
  465 
  466         if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
  467                 return -EINVAL;
  468 
  469         packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
  470         if (!packet)
  471                 return -ENOMEM;
  472 
  473         if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
  474                 ret = -EFAULT;
  475                 goto err;
  476         }
  477 
  478         if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
  479                 ret = -EINVAL;
  480                 goto err;
  481         }
  482 
  483         buf += hdr_size(file);
  484 
  485         if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
  486                 ret = -EFAULT;
  487                 goto err;
  488         }
  489 
  490         mutex_lock(&file->mutex);
  491 
  492         agent = __get_agent(file, packet->mad.hdr.id);
  493         if (!agent) {
  494                 ret = -EINVAL;
  495                 goto err_up;
  496         }
  497 
  498         memset(&ah_attr, 0, sizeof ah_attr);
  499         ah_attr.dlid          = be16_to_cpu(packet->mad.hdr.lid);
  500         ah_attr.sl            = packet->mad.hdr.sl;
  501         ah_attr.src_path_bits = packet->mad.hdr.path_bits;
  502         ah_attr.port_num      = file->port->port_num;
  503         if (packet->mad.hdr.grh_present) {
  504                 ah_attr.ah_flags = IB_AH_GRH;
  505                 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
  506                 ah_attr.grh.sgid_index     = packet->mad.hdr.gid_index;
  507                 ah_attr.grh.flow_label     = be32_to_cpu(packet->mad.hdr.flow_label);
  508                 ah_attr.grh.hop_limit      = packet->mad.hdr.hop_limit;
  509                 ah_attr.grh.traffic_class  = packet->mad.hdr.traffic_class;
  510         }
  511 
  512         ah = ib_create_user_ah(agent->qp->pd, &ah_attr, NULL);
  513         if (IS_ERR(ah)) {
  514                 ret = PTR_ERR(ah);
  515                 goto err_up;
  516         }
  517 
  518         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
  519         hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
  520 
  521         if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
  522             && ib_mad_kernel_rmpp_agent(agent)) {
  523                 copy_offset = IB_MGMT_RMPP_HDR;
  524                 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
  525                                                 IB_MGMT_RMPP_FLAG_ACTIVE;
  526         } else {
  527                 copy_offset = IB_MGMT_MAD_HDR;
  528                 rmpp_active = 0;
  529         }
  530 
  531         base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
  532         data_len = count - hdr_size(file) - hdr_len;
  533         packet->msg = ib_create_send_mad(agent,
  534                                          be32_to_cpu(packet->mad.hdr.qpn),
  535                                          packet->mad.hdr.pkey_index, rmpp_active,
  536                                          hdr_len, data_len, GFP_KERNEL,
  537                                          base_version);
  538         if (IS_ERR(packet->msg)) {
  539                 ret = PTR_ERR(packet->msg);
  540                 goto err_ah;
  541         }
  542 
  543         packet->msg->ah         = ah;
  544         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
  545         packet->msg->retries    = packet->mad.hdr.retries;
  546         packet->msg->context[0] = packet;
  547 
  548         /* Copy MAD header.  Any RMPP header is already in place. */
  549         memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
  550 
  551         if (!rmpp_active) {
  552                 if (copy_from_user((char *)packet->msg->mad + copy_offset,
  553                                    buf + copy_offset,
  554                                    hdr_len + data_len - copy_offset)) {
  555                         ret = -EFAULT;
  556                         goto err_msg;
  557                 }
  558         } else {
  559                 ret = copy_rmpp_mad(packet->msg, buf);
  560                 if (ret)
  561                         goto err_msg;
  562         }
  563 
  564         /*
  565          * Set the high-order part of the transaction ID to make MADs from
  566          * different agents unique, and allow routing responses back to the
  567          * original requestor.
  568          */
  569         if (!ib_response_mad(packet->msg->mad)) {
  570                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
  571                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
  572                                    (be64_to_cpup(tid) & 0xffffffff));
  573                 rmpp_mad->mad_hdr.tid = *tid;
  574         }
  575 
  576         if (!ib_mad_kernel_rmpp_agent(agent)
  577            && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
  578            && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
  579                 spin_lock_irq(&file->send_lock);
  580                 list_add_tail(&packet->list, &file->send_list);
  581                 spin_unlock_irq(&file->send_lock);
  582         } else {
  583                 spin_lock_irq(&file->send_lock);
  584                 ret = is_duplicate(file, packet);
  585                 if (!ret)
  586                         list_add_tail(&packet->list, &file->send_list);
  587                 spin_unlock_irq(&file->send_lock);
  588                 if (ret) {
  589                         ret = -EINVAL;
  590                         goto err_msg;
  591                 }
  592         }
  593 
  594         ret = ib_post_send_mad(packet->msg, NULL);
  595         if (ret)
  596                 goto err_send;
  597 
  598         mutex_unlock(&file->mutex);
  599         return count;
  600 
  601 err_send:
  602         dequeue_send(file, packet);
  603 err_msg:
  604         ib_free_send_mad(packet->msg);
  605 err_ah:
  606         ib_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
  607 err_up:
  608         mutex_unlock(&file->mutex);
  609 err:
  610         kfree(packet);
  611         return ret;
  612 }
  613 
  614 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
  615 {
  616         struct ib_umad_file *file = filp->private_data;
  617 
  618         /* we will always be able to post a MAD send */
  619         unsigned int mask = POLLOUT | POLLWRNORM;
  620 
  621         poll_wait(filp, &file->recv_wait, wait);
  622 
  623         if (!list_empty(&file->recv_list))
  624                 mask |= POLLIN | POLLRDNORM;
  625 
  626         return mask;
  627 }
  628 
  629 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
  630                              int compat_method_mask)
  631 {
  632         struct ib_user_mad_reg_req ureq;
  633         struct ib_mad_reg_req req;
  634         struct ib_mad_agent *agent = NULL;
  635         int agent_id;
  636         int ret;
  637 
  638         mutex_lock(&file->port->file_mutex);
  639         mutex_lock(&file->mutex);
  640 
  641         if (!file->port->ib_dev) {
  642                 dev_notice(file->port->dev,
  643                            "ib_umad_reg_agent: invalid device\n");
  644                 ret = -EPIPE;
  645                 goto out;
  646         }
  647 
  648         if (copy_from_user(&ureq, arg, sizeof ureq)) {
  649                 ret = -EFAULT;
  650                 goto out;
  651         }
  652 
  653         if (ureq.qpn != 0 && ureq.qpn != 1) {
  654                 dev_notice(file->port->dev,
  655                            "ib_umad_reg_agent: invalid QPN %d specified\n",
  656                            ureq.qpn);
  657                 ret = -EINVAL;
  658                 goto out;
  659         }
  660 
  661         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
  662                 if (!__get_agent(file, agent_id))
  663                         goto found;
  664 
  665         dev_notice(file->port->dev,
  666                    "ib_umad_reg_agent: Max Agents (%u) reached\n",
  667                    IB_UMAD_MAX_AGENTS);
  668         ret = -ENOMEM;
  669         goto out;
  670 
  671 found:
  672         if (ureq.mgmt_class) {
  673                 memset(&req, 0, sizeof(req));
  674                 req.mgmt_class         = ureq.mgmt_class;
  675                 req.mgmt_class_version = ureq.mgmt_class_version;
  676                 memcpy(req.oui, ureq.oui, sizeof req.oui);
  677 
  678                 if (compat_method_mask) {
  679                         u32 *umm = (u32 *) ureq.method_mask;
  680                         int i;
  681 
  682                         for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
  683                                 req.method_mask[i] =
  684                                         umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
  685                 } else
  686                         memcpy(req.method_mask, ureq.method_mask,
  687                                sizeof req.method_mask);
  688         }
  689 
  690         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
  691                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
  692                                       ureq.mgmt_class ? &req : NULL,
  693                                       ureq.rmpp_version,
  694                                       send_handler, recv_handler, file, 0);
  695         if (IS_ERR(agent)) {
  696                 ret = PTR_ERR(agent);
  697                 agent = NULL;
  698                 goto out;
  699         }
  700 
  701         if (put_user(agent_id,
  702                      (u32 __user *) ((char *)arg + offsetof(struct ib_user_mad_reg_req, id)))) {
  703                 ret = -EFAULT;
  704                 goto out;
  705         }
  706 
  707         if (!file->already_used) {
  708                 file->already_used = 1;
  709                 if (!file->use_pkey_index) {
  710                         dev_warn(file->port->dev,
  711                                 "process %s did not enable P_Key index support.\n",
  712                                 current->comm);
  713                         dev_warn(file->port->dev,
  714                                 "   Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
  715                 }
  716         }
  717 
  718         file->agent[agent_id] = agent;
  719         ret = 0;
  720 
  721 out:
  722         mutex_unlock(&file->mutex);
  723 
  724         if (ret && agent)
  725                 ib_unregister_mad_agent(agent);
  726 
  727         mutex_unlock(&file->port->file_mutex);
  728 
  729         return ret;
  730 }
  731 
  732 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
  733 {
  734         struct ib_user_mad_reg_req2 ureq;
  735         struct ib_mad_reg_req req;
  736         struct ib_mad_agent *agent = NULL;
  737         int agent_id;
  738         int ret;
  739 
  740         mutex_lock(&file->port->file_mutex);
  741         mutex_lock(&file->mutex);
  742 
  743         if (!file->port->ib_dev) {
  744                 dev_notice(file->port->dev,
  745                            "ib_umad_reg_agent2: invalid device\n");
  746                 ret = -EPIPE;
  747                 goto out;
  748         }
  749 
  750         if (copy_from_user(&ureq, arg, sizeof(ureq))) {
  751                 ret = -EFAULT;
  752                 goto out;
  753         }
  754 
  755         if (ureq.qpn != 0 && ureq.qpn != 1) {
  756                 dev_notice(file->port->dev,
  757                            "ib_umad_reg_agent2: invalid QPN %d specified\n",
  758                            ureq.qpn);
  759                 ret = -EINVAL;
  760                 goto out;
  761         }
  762 
  763         if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
  764                 const u32 flags = IB_USER_MAD_REG_FLAGS_CAP;
  765                 dev_notice(file->port->dev,
  766                            "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
  767                            ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
  768                 ret = -EINVAL;
  769 
  770                 if (put_user(flags,
  771                                 (u32 __user *) ((char *)arg + offsetof(struct
  772                                 ib_user_mad_reg_req2, flags))))
  773                         ret = -EFAULT;
  774 
  775                 goto out;
  776         }
  777 
  778         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
  779                 if (!__get_agent(file, agent_id))
  780                         goto found;
  781 
  782         dev_notice(file->port->dev,
  783                    "ib_umad_reg_agent2: Max Agents (%u) reached\n",
  784                    IB_UMAD_MAX_AGENTS);
  785         ret = -ENOMEM;
  786         goto out;
  787 
  788 found:
  789         if (ureq.mgmt_class) {
  790                 memset(&req, 0, sizeof(req));
  791                 req.mgmt_class         = ureq.mgmt_class;
  792                 req.mgmt_class_version = ureq.mgmt_class_version;
  793                 if (ureq.oui & 0xff000000) {
  794                         dev_notice(file->port->dev,
  795                                    "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
  796                                    ureq.oui);
  797                         ret = -EINVAL;
  798                         goto out;
  799                 }
  800                 req.oui[2] =  ureq.oui & 0x0000ff;
  801                 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
  802                 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
  803                 memcpy(req.method_mask, ureq.method_mask,
  804                         sizeof(req.method_mask));
  805         }
  806 
  807         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
  808                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
  809                                       ureq.mgmt_class ? &req : NULL,
  810                                       ureq.rmpp_version,
  811                                       send_handler, recv_handler, file,
  812                                       ureq.flags);
  813         if (IS_ERR(agent)) {
  814                 ret = PTR_ERR(agent);
  815                 agent = NULL;
  816                 goto out;
  817         }
  818 
  819         if (put_user(agent_id,
  820                      (u32 __user *)((char *)arg +
  821                                 offsetof(struct ib_user_mad_reg_req2, id)))) {
  822                 ret = -EFAULT;
  823                 goto out;
  824         }
  825 
  826         if (!file->already_used) {
  827                 file->already_used = 1;
  828                 file->use_pkey_index = 1;
  829         }
  830 
  831         file->agent[agent_id] = agent;
  832         ret = 0;
  833 
  834 out:
  835         mutex_unlock(&file->mutex);
  836 
  837         if (ret && agent)
  838                 ib_unregister_mad_agent(agent);
  839 
  840         mutex_unlock(&file->port->file_mutex);
  841 
  842         return ret;
  843 }
  844 
  845 
  846 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
  847 {
  848         struct ib_mad_agent *agent = NULL;
  849         u32 id;
  850         int ret = 0;
  851 
  852         if (get_user(id, arg))
  853                 return -EFAULT;
  854 
  855         mutex_lock(&file->port->file_mutex);
  856         mutex_lock(&file->mutex);
  857 
  858         if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
  859                 ret = -EINVAL;
  860                 goto out;
  861         }
  862 
  863         agent = file->agent[id];
  864         file->agent[id] = NULL;
  865 
  866 out:
  867         mutex_unlock(&file->mutex);
  868 
  869         if (agent)
  870                 ib_unregister_mad_agent(agent);
  871 
  872         mutex_unlock(&file->port->file_mutex);
  873 
  874         return ret;
  875 }
  876 
  877 static long ib_umad_enable_pkey(struct ib_umad_file *file)
  878 {
  879         int ret = 0;
  880 
  881         mutex_lock(&file->mutex);
  882         if (file->already_used)
  883                 ret = -EINVAL;
  884         else
  885                 file->use_pkey_index = 1;
  886         mutex_unlock(&file->mutex);
  887 
  888         return ret;
  889 }
  890 
  891 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
  892                           unsigned long arg)
  893 {
  894         switch (cmd) {
  895         case IB_USER_MAD_REGISTER_AGENT:
  896                 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
  897         case IB_USER_MAD_UNREGISTER_AGENT:
  898                 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
  899         case IB_USER_MAD_ENABLE_PKEY:
  900                 return ib_umad_enable_pkey(filp->private_data);
  901         case IB_USER_MAD_REGISTER_AGENT2:
  902                 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
  903         default:
  904                 return -ENOIOCTLCMD;
  905         }
  906 }
  907 
  908 #ifdef CONFIG_COMPAT
  909 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
  910                                  unsigned long arg)
  911 {
  912         switch (cmd) {
  913         case IB_USER_MAD_REGISTER_AGENT:
  914                 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
  915         case IB_USER_MAD_UNREGISTER_AGENT:
  916                 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
  917         case IB_USER_MAD_ENABLE_PKEY:
  918                 return ib_umad_enable_pkey(filp->private_data);
  919         case IB_USER_MAD_REGISTER_AGENT2:
  920                 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
  921         default:
  922                 return -ENOIOCTLCMD;
  923         }
  924 }
  925 #endif
  926 
  927 /*
  928  * ib_umad_open() does not need the BKL:
  929  *
  930  *  - the ib_umad_port structures are properly reference counted, and
  931  *    everything else is purely local to the file being created, so
  932  *    races against other open calls are not a problem;
  933  *  - the ioctl method does not affect any global state outside of the
  934  *    file structure being operated on;
  935  */
  936 static int ib_umad_open(struct inode *inode, struct file *filp)
  937 {
  938         struct ib_umad_port *port;
  939         struct ib_umad_file *file;
  940         int ret = -ENXIO;
  941 
  942         port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, cdev);
  943 
  944         mutex_lock(&port->file_mutex);
  945 
  946         if (!port->ib_dev)
  947                 goto out;
  948 
  949         ret = -ENOMEM;
  950         file = kzalloc(sizeof *file, GFP_KERNEL);
  951         if (!file)
  952                 goto out;
  953 
  954         mutex_init(&file->mutex);
  955         spin_lock_init(&file->send_lock);
  956         INIT_LIST_HEAD(&file->recv_list);
  957         INIT_LIST_HEAD(&file->send_list);
  958         init_waitqueue_head(&file->recv_wait);
  959 
  960         file->port = port;
  961         filp->private_data = file;
  962 
  963         list_add_tail(&file->port_list, &port->file_list);
  964 
  965         ret = nonseekable_open(inode, filp);
  966         if (ret) {
  967                 list_del(&file->port_list);
  968                 kfree(file);
  969                 goto out;
  970         }
  971 
  972         kobject_get(&port->umad_dev->kobj);
  973 
  974 out:
  975         mutex_unlock(&port->file_mutex);
  976         return ret;
  977 }
  978 
  979 static int ib_umad_close(struct inode *inode, struct file *filp)
  980 {
  981         struct ib_umad_file *file = filp->private_data;
  982         struct ib_umad_device *dev = file->port->umad_dev;
  983         struct ib_umad_packet *packet, *tmp;
  984         int already_dead;
  985         int i;
  986 
  987         mutex_lock(&file->port->file_mutex);
  988         mutex_lock(&file->mutex);
  989 
  990         already_dead = file->agents_dead;
  991         file->agents_dead = 1;
  992 
  993         list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
  994                 if (packet->recv_wc)
  995                         ib_free_recv_mad(packet->recv_wc);
  996                 kfree(packet);
  997         }
  998 
  999         list_del(&file->port_list);
 1000 
 1001         mutex_unlock(&file->mutex);
 1002 
 1003         if (!already_dead)
 1004                 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
 1005                         if (file->agent[i])
 1006                                 ib_unregister_mad_agent(file->agent[i]);
 1007 
 1008         mutex_unlock(&file->port->file_mutex);
 1009 
 1010         kfree(file);
 1011         kobject_put(&dev->kobj);
 1012 
 1013         return 0;
 1014 }
 1015 
 1016 static const struct file_operations umad_fops = {
 1017         .owner          = THIS_MODULE,
 1018         .read           = ib_umad_read,
 1019         .write          = ib_umad_write,
 1020         .poll           = ib_umad_poll,
 1021         .unlocked_ioctl = ib_umad_ioctl,
 1022 #ifdef CONFIG_COMPAT
 1023         .compat_ioctl   = ib_umad_compat_ioctl,
 1024 #endif
 1025         .open           = ib_umad_open,
 1026         .release        = ib_umad_close,
 1027         .llseek         = no_llseek,
 1028 };
 1029 
 1030 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
 1031 {
 1032         struct ib_umad_port *port;
 1033         struct ib_port_modify props = {
 1034                 .set_port_cap_mask = IB_PORT_SM
 1035         };
 1036         int ret;
 1037 
 1038         port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, sm_cdev);
 1039 
 1040         if (filp->f_flags & O_NONBLOCK) {
 1041                 if (down_trylock(&port->sm_sem)) {
 1042                         ret = -EAGAIN;
 1043                         goto fail;
 1044                 }
 1045         } else {
 1046                 if (down_interruptible(&port->sm_sem)) {
 1047                         ret = -ERESTARTSYS;
 1048                         goto fail;
 1049                 }
 1050         }
 1051 
 1052         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 1053         if (ret)
 1054                 goto err_up_sem;
 1055 
 1056         filp->private_data = port;
 1057 
 1058         ret = nonseekable_open(inode, filp);
 1059         if (ret)
 1060                 goto err_clr_sm_cap;
 1061 
 1062         kobject_get(&port->umad_dev->kobj);
 1063 
 1064         return 0;
 1065 
 1066 err_clr_sm_cap:
 1067         swap(props.set_port_cap_mask, props.clr_port_cap_mask);
 1068         ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 1069 
 1070 err_up_sem:
 1071         up(&port->sm_sem);
 1072 
 1073 fail:
 1074         return ret;
 1075 }
 1076 
 1077 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
 1078 {
 1079         struct ib_umad_port *port = filp->private_data;
 1080         struct ib_port_modify props = {
 1081                 .clr_port_cap_mask = IB_PORT_SM
 1082         };
 1083         int ret = 0;
 1084 
 1085         mutex_lock(&port->file_mutex);
 1086         if (port->ib_dev)
 1087                 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 1088         mutex_unlock(&port->file_mutex);
 1089 
 1090         up(&port->sm_sem);
 1091 
 1092         kobject_put(&port->umad_dev->kobj);
 1093 
 1094         return ret;
 1095 }
 1096 
 1097 static const struct file_operations umad_sm_fops = {
 1098         .owner   = THIS_MODULE,
 1099         .open    = ib_umad_sm_open,
 1100         .release = ib_umad_sm_close,
 1101         .llseek  = no_llseek,
 1102 };
 1103 
 1104 static struct ib_client umad_client = {
 1105         .name   = "umad",
 1106         .add    = ib_umad_add_one,
 1107         .remove = ib_umad_remove_one
 1108 };
 1109 
 1110 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
 1111                           char *buf)
 1112 {
 1113         struct ib_umad_port *port = dev_get_drvdata(dev);
 1114 
 1115         if (!port)
 1116                 return -ENODEV;
 1117 
 1118         return sprintf(buf, "%s\n", port->ib_dev->name);
 1119 }
 1120 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 1121 
 1122 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
 1123                          char *buf)
 1124 {
 1125         struct ib_umad_port *port = dev_get_drvdata(dev);
 1126 
 1127         if (!port)
 1128                 return -ENODEV;
 1129 
 1130         return sprintf(buf, "%d\n", port->port_num);
 1131 }
 1132 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
 1133 
 1134 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 1135                          __stringify(IB_USER_MAD_ABI_VERSION));
 1136 
 1137 static dev_t overflow_maj;
 1138 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
 1139 static int find_overflow_devnum(struct ib_device *device)
 1140 {
 1141         int ret;
 1142 
 1143         if (!overflow_maj) {
 1144                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
 1145                                           "infiniband_mad");
 1146                 if (ret) {
 1147                         dev_err(&device->dev,
 1148                                 "couldn't register dynamic device number\n");
 1149                         return ret;
 1150                 }
 1151         }
 1152 
 1153         ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
 1154         if (ret >= IB_UMAD_MAX_PORTS)
 1155                 return -1;
 1156 
 1157         return ret;
 1158 }
 1159 
 1160 static int ib_umad_init_port(struct ib_device *device, int port_num,
 1161                              struct ib_umad_device *umad_dev,
 1162                              struct ib_umad_port *port)
 1163 {
 1164         int devnum;
 1165         dev_t base;
 1166 
 1167         spin_lock(&port_lock);
 1168         devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
 1169         if (devnum >= IB_UMAD_MAX_PORTS) {
 1170                 spin_unlock(&port_lock);
 1171                 devnum = find_overflow_devnum(device);
 1172                 if (devnum < 0)
 1173                         return -1;
 1174 
 1175                 spin_lock(&port_lock);
 1176                 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
 1177                 base = devnum + overflow_maj;
 1178                 set_bit(devnum, overflow_map);
 1179         } else {
 1180                 port->dev_num = devnum;
 1181                 base = devnum + base_dev;
 1182                 set_bit(devnum, dev_map);
 1183         }
 1184         spin_unlock(&port_lock);
 1185 
 1186         port->ib_dev   = device;
 1187         port->port_num = port_num;
 1188         sema_init(&port->sm_sem, 1);
 1189         mutex_init(&port->file_mutex);
 1190         INIT_LIST_HEAD(&port->file_list);
 1191 
 1192         cdev_init(&port->cdev, &umad_fops);
 1193         port->cdev.owner = THIS_MODULE;
 1194         port->cdev.kobj.parent = &umad_dev->kobj;
 1195         kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
 1196         if (cdev_add(&port->cdev, base, 1))
 1197                 goto err_cdev;
 1198 
 1199         port->dev = device_create(umad_class, device->dma_device,
 1200                                   port->cdev.dev, port,
 1201                                   "umad%d", port->dev_num);
 1202         if (IS_ERR(port->dev))
 1203                 goto err_cdev;
 1204 
 1205         if (device_create_file(port->dev, &dev_attr_ibdev))
 1206                 goto err_dev;
 1207         if (device_create_file(port->dev, &dev_attr_port))
 1208                 goto err_dev;
 1209 
 1210         base += IB_UMAD_MAX_PORTS;
 1211         cdev_init(&port->sm_cdev, &umad_sm_fops);
 1212         port->sm_cdev.owner = THIS_MODULE;
 1213         port->sm_cdev.kobj.parent = &umad_dev->kobj;
 1214         kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
 1215         if (cdev_add(&port->sm_cdev, base, 1))
 1216                 goto err_sm_cdev;
 1217 
 1218         port->sm_dev = device_create(umad_class, device->dma_device,
 1219                                      port->sm_cdev.dev, port,
 1220                                      "issm%d", port->dev_num);
 1221         if (IS_ERR(port->sm_dev))
 1222                 goto err_sm_cdev;
 1223 
 1224         if (device_create_file(port->sm_dev, &dev_attr_ibdev))
 1225                 goto err_sm_dev;
 1226         if (device_create_file(port->sm_dev, &dev_attr_port))
 1227                 goto err_sm_dev;
 1228 
 1229         return 0;
 1230 
 1231 err_sm_dev:
 1232         device_destroy(umad_class, port->sm_cdev.dev);
 1233 
 1234 err_sm_cdev:
 1235         cdev_del(&port->sm_cdev);
 1236 
 1237 err_dev:
 1238         device_destroy(umad_class, port->cdev.dev);
 1239 
 1240 err_cdev:
 1241         cdev_del(&port->cdev);
 1242         if (port->dev_num < IB_UMAD_MAX_PORTS)
 1243                 clear_bit(devnum, dev_map);
 1244         else
 1245                 clear_bit(devnum, overflow_map);
 1246 
 1247         return -1;
 1248 }
 1249 
 1250 static void ib_umad_kill_port(struct ib_umad_port *port)
 1251 {
 1252         struct ib_umad_file *file;
 1253         int id;
 1254 
 1255         dev_set_drvdata(port->dev,    NULL);
 1256         dev_set_drvdata(port->sm_dev, NULL);
 1257 
 1258         device_destroy(umad_class, port->cdev.dev);
 1259         device_destroy(umad_class, port->sm_cdev.dev);
 1260 
 1261         cdev_del(&port->cdev);
 1262         cdev_del(&port->sm_cdev);
 1263 
 1264         mutex_lock(&port->file_mutex);
 1265 
 1266         port->ib_dev = NULL;
 1267 
 1268         list_for_each_entry(file, &port->file_list, port_list) {
 1269                 mutex_lock(&file->mutex);
 1270                 file->agents_dead = 1;
 1271                 mutex_unlock(&file->mutex);
 1272 
 1273                 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
 1274                         if (file->agent[id])
 1275                                 ib_unregister_mad_agent(file->agent[id]);
 1276         }
 1277 
 1278         mutex_unlock(&port->file_mutex);
 1279 
 1280         if (port->dev_num < IB_UMAD_MAX_PORTS)
 1281                 clear_bit(port->dev_num, dev_map);
 1282         else
 1283                 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
 1284 }
 1285 
 1286 static void ib_umad_add_one(struct ib_device *device)
 1287 {
 1288         struct ib_umad_device *umad_dev;
 1289         int s, e, i;
 1290         int count = 0;
 1291 
 1292         s = rdma_start_port(device);
 1293         e = rdma_end_port(device);
 1294 
 1295         umad_dev = kzalloc(sizeof *umad_dev +
 1296                            (e - s + 1) * sizeof (struct ib_umad_port),
 1297                            GFP_KERNEL);
 1298         if (!umad_dev)
 1299                 return;
 1300 
 1301         kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
 1302 
 1303         for (i = s; i <= e; ++i) {
 1304                 if (!rdma_cap_ib_mad(device, i))
 1305                         continue;
 1306 
 1307                 umad_dev->port[i - s].umad_dev = umad_dev;
 1308 
 1309                 if (ib_umad_init_port(device, i, umad_dev,
 1310                                       &umad_dev->port[i - s]))
 1311                         goto err;
 1312 
 1313                 count++;
 1314         }
 1315 
 1316         if (!count)
 1317                 goto free;
 1318 
 1319         ib_set_client_data(device, &umad_client, umad_dev);
 1320 
 1321         return;
 1322 
 1323 err:
 1324         while (--i >= s) {
 1325                 if (!rdma_cap_ib_mad(device, i))
 1326                         continue;
 1327 
 1328                 ib_umad_kill_port(&umad_dev->port[i - s]);
 1329         }
 1330 free:
 1331         kobject_put(&umad_dev->kobj);
 1332 }
 1333 
 1334 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
 1335 {
 1336         struct ib_umad_device *umad_dev = client_data;
 1337         int i;
 1338 
 1339         if (!umad_dev)
 1340                 return;
 1341 
 1342         for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
 1343                 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
 1344                         ib_umad_kill_port(&umad_dev->port[i]);
 1345         }
 1346 
 1347         kobject_put(&umad_dev->kobj);
 1348 }
 1349 
 1350 static char *umad_devnode(struct device *dev, umode_t *mode)
 1351 {
 1352         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
 1353 }
 1354 
 1355 static int __init ib_umad_init(void)
 1356 {
 1357         int ret;
 1358 
 1359         ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
 1360                                      "infiniband_mad");
 1361         if (ret) {
 1362                 pr_err("couldn't register device number\n");
 1363                 goto out;
 1364         }
 1365 
 1366         umad_class = class_create(THIS_MODULE, "infiniband_mad");
 1367         if (IS_ERR(umad_class)) {
 1368                 ret = PTR_ERR(umad_class);
 1369                 pr_err("couldn't create class infiniband_mad\n");
 1370                 goto out_chrdev;
 1371         }
 1372 
 1373         umad_class->devnode = umad_devnode;
 1374 
 1375         ret = class_create_file(umad_class, &class_attr_abi_version.attr);
 1376         if (ret) {
 1377                 pr_err("couldn't create abi_version attribute\n");
 1378                 goto out_class;
 1379         }
 1380 
 1381         ret = ib_register_client(&umad_client);
 1382         if (ret) {
 1383                 pr_err("couldn't register ib_umad client\n");
 1384                 goto out_class;
 1385         }
 1386 
 1387         return 0;
 1388 
 1389 out_class:
 1390         class_destroy(umad_class);
 1391 
 1392 out_chrdev:
 1393         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
 1394 
 1395 out:
 1396         return ret;
 1397 }
 1398 
 1399 static void __exit ib_umad_cleanup(void)
 1400 {
 1401         ib_unregister_client(&umad_client);
 1402         class_destroy(umad_class);
 1403         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
 1404         if (overflow_maj)
 1405                 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
 1406 }
 1407 
 1408 module_init_order(ib_umad_init, SI_ORDER_FIFTH);
 1409 module_exit_order(ib_umad_cleanup, SI_ORDER_FIFTH);

Cache object: 111807cf8f6a1ad7c151f6fa19bfc71b


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