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0001 /*
0002  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
0003  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
0004  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
0005  * Copyright (c) 2008 Cisco. All rights reserved.
0006  *
0007  * This software is available to you under a choice of one of two
0008  * licenses.  You may choose to be licensed under the terms of the GNU
0009  * General Public License (GPL) Version 2, available from the file
0010  * COPYING in the main directory of this source tree, or the
0011  * OpenIB.org BSD license below:
0012  *
0013  *     Redistribution and use in source and binary forms, with or
0014  *     without modification, are permitted provided that the following
0015  *     conditions are met:
0016  *
0017  *      - Redistributions of source code must retain the above
0018  *        copyright notice, this list of conditions and the following
0019  *        disclaimer.
0020  *
0021  *      - Redistributions in binary form must reproduce the above
0022  *        copyright notice, this list of conditions and the following
0023  *        disclaimer in the documentation and/or other materials
0024  *        provided with the distribution.
0025  *
0026  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0027  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0028  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0029  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0030  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0031  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0032  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0033  * SOFTWARE.
0034  */
0035 
0036 #define pr_fmt(fmt) "user_mad: " fmt
0037 
0038 #include <linux/module.h>
0039 #include <linux/init.h>
0040 #include <linux/device.h>
0041 #include <linux/err.h>
0042 #include <linux/fs.h>
0043 #include <linux/cdev.h>
0044 #include <linux/dma-mapping.h>
0045 #include <linux/poll.h>
0046 #include <linux/mutex.h>
0047 #include <linux/kref.h>
0048 #include <linux/compat.h>
0049 #include <linux/sched.h>
0050 #include <linux/semaphore.h>
0051 #include <linux/slab.h>
0052 #include <linux/nospec.h>
0053 
0054 #include <linux/uaccess.h>
0055 
0056 #include <rdma/ib_mad.h>
0057 #include <rdma/ib_user_mad.h>
0058 #include <rdma/rdma_netlink.h>
0059 
0060 #include "core_priv.h"
0061 
0062 MODULE_AUTHOR("Roland Dreier");
0063 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
0064 MODULE_LICENSE("Dual BSD/GPL");
0065 
0066 enum {
0067     IB_UMAD_MAX_PORTS  = RDMA_MAX_PORTS,
0068     IB_UMAD_MAX_AGENTS = 32,
0069 
0070     IB_UMAD_MAJOR      = 231,
0071     IB_UMAD_MINOR_BASE = 0,
0072     IB_UMAD_NUM_FIXED_MINOR = 64,
0073     IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
0074     IB_ISSM_MINOR_BASE        = IB_UMAD_NUM_FIXED_MINOR,
0075 };
0076 
0077 /*
0078  * Our lifetime rules for these structs are the following:
0079  * device special file is opened, we take a reference on the
0080  * ib_umad_port's struct ib_umad_device. We drop these
0081  * references in the corresponding close().
0082  *
0083  * In addition to references coming from open character devices, there
0084  * is one more reference to each ib_umad_device representing the
0085  * module's reference taken when allocating the ib_umad_device in
0086  * ib_umad_add_one().
0087  *
0088  * When destroying an ib_umad_device, we drop the module's reference.
0089  */
0090 
0091 struct ib_umad_port {
0092     struct cdev           cdev;
0093     struct device         dev;
0094     struct cdev           sm_cdev;
0095     struct device         sm_dev;
0096     struct semaphore       sm_sem;
0097 
0098     struct mutex           file_mutex;
0099     struct list_head       file_list;
0100 
0101     struct ib_device      *ib_dev;
0102     struct ib_umad_device *umad_dev;
0103     int                    dev_num;
0104     u32                     port_num;
0105 };
0106 
0107 struct ib_umad_device {
0108     struct kref kref;
0109     struct ib_umad_port ports[];
0110 };
0111 
0112 struct ib_umad_file {
0113     struct mutex        mutex;
0114     struct ib_umad_port    *port;
0115     struct list_head    recv_list;
0116     struct list_head    send_list;
0117     struct list_head    port_list;
0118     spinlock_t      send_lock;
0119     wait_queue_head_t   recv_wait;
0120     struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
0121     int         agents_dead;
0122     u8          use_pkey_index;
0123     u8          already_used;
0124 };
0125 
0126 struct ib_umad_packet {
0127     struct ib_mad_send_buf *msg;
0128     struct ib_mad_recv_wc  *recv_wc;
0129     struct list_head   list;
0130     int        length;
0131     struct ib_user_mad mad;
0132 };
0133 
0134 #define CREATE_TRACE_POINTS
0135 #include <trace/events/ib_umad.h>
0136 
0137 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
0138 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
0139                    IB_UMAD_NUM_FIXED_MINOR;
0140 static dev_t dynamic_umad_dev;
0141 static dev_t dynamic_issm_dev;
0142 
0143 static DEFINE_IDA(umad_ida);
0144 
0145 static int ib_umad_add_one(struct ib_device *device);
0146 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
0147 
0148 static void ib_umad_dev_free(struct kref *kref)
0149 {
0150     struct ib_umad_device *dev =
0151         container_of(kref, struct ib_umad_device, kref);
0152 
0153     kfree(dev);
0154 }
0155 
0156 static void ib_umad_dev_get(struct ib_umad_device *dev)
0157 {
0158     kref_get(&dev->kref);
0159 }
0160 
0161 static void ib_umad_dev_put(struct ib_umad_device *dev)
0162 {
0163     kref_put(&dev->kref, ib_umad_dev_free);
0164 }
0165 
0166 static int hdr_size(struct ib_umad_file *file)
0167 {
0168     return file->use_pkey_index ? sizeof(struct ib_user_mad_hdr) :
0169                       sizeof(struct ib_user_mad_hdr_old);
0170 }
0171 
0172 /* caller must hold file->mutex */
0173 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
0174 {
0175     return file->agents_dead ? NULL : file->agent[id];
0176 }
0177 
0178 static int queue_packet(struct ib_umad_file *file,
0179             struct ib_mad_agent *agent,
0180             struct ib_umad_packet *packet)
0181 {
0182     int ret = 1;
0183 
0184     mutex_lock(&file->mutex);
0185 
0186     for (packet->mad.hdr.id = 0;
0187          packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
0188          packet->mad.hdr.id++)
0189         if (agent == __get_agent(file, packet->mad.hdr.id)) {
0190             list_add_tail(&packet->list, &file->recv_list);
0191             wake_up_interruptible(&file->recv_wait);
0192             ret = 0;
0193             break;
0194         }
0195 
0196     mutex_unlock(&file->mutex);
0197 
0198     return ret;
0199 }
0200 
0201 static void dequeue_send(struct ib_umad_file *file,
0202              struct ib_umad_packet *packet)
0203 {
0204     spin_lock_irq(&file->send_lock);
0205     list_del(&packet->list);
0206     spin_unlock_irq(&file->send_lock);
0207 }
0208 
0209 static void send_handler(struct ib_mad_agent *agent,
0210              struct ib_mad_send_wc *send_wc)
0211 {
0212     struct ib_umad_file *file = agent->context;
0213     struct ib_umad_packet *packet = send_wc->send_buf->context[0];
0214 
0215     dequeue_send(file, packet);
0216     rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
0217     ib_free_send_mad(packet->msg);
0218 
0219     if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
0220         packet->length = IB_MGMT_MAD_HDR;
0221         packet->mad.hdr.status = ETIMEDOUT;
0222         if (!queue_packet(file, agent, packet))
0223             return;
0224     }
0225     kfree(packet);
0226 }
0227 
0228 static void recv_handler(struct ib_mad_agent *agent,
0229              struct ib_mad_send_buf *send_buf,
0230              struct ib_mad_recv_wc *mad_recv_wc)
0231 {
0232     struct ib_umad_file *file = agent->context;
0233     struct ib_umad_packet *packet;
0234 
0235     if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
0236         goto err1;
0237 
0238     packet = kzalloc(sizeof *packet, GFP_KERNEL);
0239     if (!packet)
0240         goto err1;
0241 
0242     packet->length = mad_recv_wc->mad_len;
0243     packet->recv_wc = mad_recv_wc;
0244 
0245     packet->mad.hdr.status     = 0;
0246     packet->mad.hdr.length     = hdr_size(file) + mad_recv_wc->mad_len;
0247     packet->mad.hdr.qpn    = cpu_to_be32(mad_recv_wc->wc->src_qp);
0248     /*
0249      * On OPA devices it is okay to lose the upper 16 bits of LID as this
0250      * information is obtained elsewhere. Mask off the upper 16 bits.
0251      */
0252     if (rdma_cap_opa_mad(agent->device, agent->port_num))
0253         packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
0254                           mad_recv_wc->wc->slid);
0255     else
0256         packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
0257     packet->mad.hdr.sl     = mad_recv_wc->wc->sl;
0258     packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
0259     packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
0260     packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
0261     if (packet->mad.hdr.grh_present) {
0262         struct rdma_ah_attr ah_attr;
0263         const struct ib_global_route *grh;
0264         int ret;
0265 
0266         ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
0267                           mad_recv_wc->wc,
0268                           mad_recv_wc->recv_buf.grh,
0269                           &ah_attr);
0270         if (ret)
0271             goto err2;
0272 
0273         grh = rdma_ah_read_grh(&ah_attr);
0274         packet->mad.hdr.gid_index = grh->sgid_index;
0275         packet->mad.hdr.hop_limit = grh->hop_limit;
0276         packet->mad.hdr.traffic_class = grh->traffic_class;
0277         memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
0278         packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
0279         rdma_destroy_ah_attr(&ah_attr);
0280     }
0281 
0282     if (queue_packet(file, agent, packet))
0283         goto err2;
0284     return;
0285 
0286 err2:
0287     kfree(packet);
0288 err1:
0289     ib_free_recv_mad(mad_recv_wc);
0290 }
0291 
0292 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
0293                  struct ib_umad_packet *packet, size_t count)
0294 {
0295     struct ib_mad_recv_buf *recv_buf;
0296     int left, seg_payload, offset, max_seg_payload;
0297     size_t seg_size;
0298 
0299     recv_buf = &packet->recv_wc->recv_buf;
0300     seg_size = packet->recv_wc->mad_seg_size;
0301 
0302     /* We need enough room to copy the first (or only) MAD segment. */
0303     if ((packet->length <= seg_size &&
0304          count < hdr_size(file) + packet->length) ||
0305         (packet->length > seg_size &&
0306          count < hdr_size(file) + seg_size))
0307         return -EINVAL;
0308 
0309     if (copy_to_user(buf, &packet->mad, hdr_size(file)))
0310         return -EFAULT;
0311 
0312     buf += hdr_size(file);
0313     seg_payload = min_t(int, packet->length, seg_size);
0314     if (copy_to_user(buf, recv_buf->mad, seg_payload))
0315         return -EFAULT;
0316 
0317     if (seg_payload < packet->length) {
0318         /*
0319          * Multipacket RMPP MAD message. Copy remainder of message.
0320          * Note that last segment may have a shorter payload.
0321          */
0322         if (count < hdr_size(file) + packet->length) {
0323             /*
0324              * The buffer is too small, return the first RMPP segment,
0325              * which includes the RMPP message length.
0326              */
0327             return -ENOSPC;
0328         }
0329         offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
0330         max_seg_payload = seg_size - offset;
0331 
0332         for (left = packet->length - seg_payload, buf += seg_payload;
0333              left; left -= seg_payload, buf += seg_payload) {
0334             recv_buf = container_of(recv_buf->list.next,
0335                         struct ib_mad_recv_buf, list);
0336             seg_payload = min(left, max_seg_payload);
0337             if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
0338                      seg_payload))
0339                 return -EFAULT;
0340         }
0341     }
0342 
0343     trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
0344 
0345     return hdr_size(file) + packet->length;
0346 }
0347 
0348 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
0349                  struct ib_umad_packet *packet, size_t count)
0350 {
0351     ssize_t size = hdr_size(file) + packet->length;
0352 
0353     if (count < size)
0354         return -EINVAL;
0355 
0356     if (copy_to_user(buf, &packet->mad, hdr_size(file)))
0357         return -EFAULT;
0358 
0359     buf += hdr_size(file);
0360 
0361     if (copy_to_user(buf, packet->mad.data, packet->length))
0362         return -EFAULT;
0363 
0364     trace_ib_umad_read_send(file, &packet->mad.hdr,
0365                 (struct ib_mad_hdr *)&packet->mad.data);
0366 
0367     return size;
0368 }
0369 
0370 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
0371                 size_t count, loff_t *pos)
0372 {
0373     struct ib_umad_file *file = filp->private_data;
0374     struct ib_umad_packet *packet;
0375     ssize_t ret;
0376 
0377     if (count < hdr_size(file))
0378         return -EINVAL;
0379 
0380     mutex_lock(&file->mutex);
0381 
0382     if (file->agents_dead) {
0383         mutex_unlock(&file->mutex);
0384         return -EIO;
0385     }
0386 
0387     while (list_empty(&file->recv_list)) {
0388         mutex_unlock(&file->mutex);
0389 
0390         if (filp->f_flags & O_NONBLOCK)
0391             return -EAGAIN;
0392 
0393         if (wait_event_interruptible(file->recv_wait,
0394                          !list_empty(&file->recv_list)))
0395             return -ERESTARTSYS;
0396 
0397         mutex_lock(&file->mutex);
0398     }
0399 
0400     if (file->agents_dead) {
0401         mutex_unlock(&file->mutex);
0402         return -EIO;
0403     }
0404 
0405     packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
0406     list_del(&packet->list);
0407 
0408     mutex_unlock(&file->mutex);
0409 
0410     if (packet->recv_wc)
0411         ret = copy_recv_mad(file, buf, packet, count);
0412     else
0413         ret = copy_send_mad(file, buf, packet, count);
0414 
0415     if (ret < 0) {
0416         /* Requeue packet */
0417         mutex_lock(&file->mutex);
0418         list_add(&packet->list, &file->recv_list);
0419         mutex_unlock(&file->mutex);
0420     } else {
0421         if (packet->recv_wc)
0422             ib_free_recv_mad(packet->recv_wc);
0423         kfree(packet);
0424     }
0425     return ret;
0426 }
0427 
0428 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
0429 {
0430     int left, seg;
0431 
0432     /* Copy class specific header */
0433     if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
0434         copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
0435                msg->hdr_len - IB_MGMT_RMPP_HDR))
0436         return -EFAULT;
0437 
0438     /* All headers are in place.  Copy data segments. */
0439     for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
0440          seg++, left -= msg->seg_size, buf += msg->seg_size) {
0441         if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
0442                    min(left, msg->seg_size)))
0443             return -EFAULT;
0444     }
0445     return 0;
0446 }
0447 
0448 static int same_destination(struct ib_user_mad_hdr *hdr1,
0449                 struct ib_user_mad_hdr *hdr2)
0450 {
0451     if (!hdr1->grh_present && !hdr2->grh_present)
0452        return (hdr1->lid == hdr2->lid);
0453 
0454     if (hdr1->grh_present && hdr2->grh_present)
0455        return !memcmp(hdr1->gid, hdr2->gid, 16);
0456 
0457     return 0;
0458 }
0459 
0460 static int is_duplicate(struct ib_umad_file *file,
0461             struct ib_umad_packet *packet)
0462 {
0463     struct ib_umad_packet *sent_packet;
0464     struct ib_mad_hdr *sent_hdr, *hdr;
0465 
0466     hdr = (struct ib_mad_hdr *) packet->mad.data;
0467     list_for_each_entry(sent_packet, &file->send_list, list) {
0468         sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
0469 
0470         if ((hdr->tid != sent_hdr->tid) ||
0471             (hdr->mgmt_class != sent_hdr->mgmt_class))
0472             continue;
0473 
0474         /*
0475          * No need to be overly clever here.  If two new operations have
0476          * the same TID, reject the second as a duplicate.  This is more
0477          * restrictive than required by the spec.
0478          */
0479         if (!ib_response_mad(hdr)) {
0480             if (!ib_response_mad(sent_hdr))
0481                 return 1;
0482             continue;
0483         } else if (!ib_response_mad(sent_hdr))
0484             continue;
0485 
0486         if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
0487             return 1;
0488     }
0489 
0490     return 0;
0491 }
0492 
0493 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
0494                  size_t count, loff_t *pos)
0495 {
0496     struct ib_umad_file *file = filp->private_data;
0497     struct ib_umad_packet *packet;
0498     struct ib_mad_agent *agent;
0499     struct rdma_ah_attr ah_attr;
0500     struct ib_ah *ah;
0501     struct ib_rmpp_mad *rmpp_mad;
0502     __be64 *tid;
0503     int ret, data_len, hdr_len, copy_offset, rmpp_active;
0504     u8 base_version;
0505 
0506     if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
0507         return -EINVAL;
0508 
0509     packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
0510     if (!packet)
0511         return -ENOMEM;
0512 
0513     if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
0514         ret = -EFAULT;
0515         goto err;
0516     }
0517 
0518     if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
0519         ret = -EINVAL;
0520         goto err;
0521     }
0522 
0523     buf += hdr_size(file);
0524 
0525     if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
0526         ret = -EFAULT;
0527         goto err;
0528     }
0529 
0530     mutex_lock(&file->mutex);
0531 
0532     trace_ib_umad_write(file, &packet->mad.hdr,
0533                 (struct ib_mad_hdr *)&packet->mad.data);
0534 
0535     agent = __get_agent(file, packet->mad.hdr.id);
0536     if (!agent) {
0537         ret = -EIO;
0538         goto err_up;
0539     }
0540 
0541     memset(&ah_attr, 0, sizeof ah_attr);
0542     ah_attr.type = rdma_ah_find_type(agent->device,
0543                      file->port->port_num);
0544     rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
0545     rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
0546     rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
0547     rdma_ah_set_port_num(&ah_attr, file->port->port_num);
0548     if (packet->mad.hdr.grh_present) {
0549         rdma_ah_set_grh(&ah_attr, NULL,
0550                 be32_to_cpu(packet->mad.hdr.flow_label),
0551                 packet->mad.hdr.gid_index,
0552                 packet->mad.hdr.hop_limit,
0553                 packet->mad.hdr.traffic_class);
0554         rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
0555     }
0556 
0557     ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
0558     if (IS_ERR(ah)) {
0559         ret = PTR_ERR(ah);
0560         goto err_up;
0561     }
0562 
0563     rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
0564     hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
0565 
0566     if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
0567         && ib_mad_kernel_rmpp_agent(agent)) {
0568         copy_offset = IB_MGMT_RMPP_HDR;
0569         rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
0570                         IB_MGMT_RMPP_FLAG_ACTIVE;
0571     } else {
0572         copy_offset = IB_MGMT_MAD_HDR;
0573         rmpp_active = 0;
0574     }
0575 
0576     base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
0577     data_len = count - hdr_size(file) - hdr_len;
0578     packet->msg = ib_create_send_mad(agent,
0579                      be32_to_cpu(packet->mad.hdr.qpn),
0580                      packet->mad.hdr.pkey_index, rmpp_active,
0581                      hdr_len, data_len, GFP_KERNEL,
0582                      base_version);
0583     if (IS_ERR(packet->msg)) {
0584         ret = PTR_ERR(packet->msg);
0585         goto err_ah;
0586     }
0587 
0588     packet->msg->ah     = ah;
0589     packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
0590     packet->msg->retries    = packet->mad.hdr.retries;
0591     packet->msg->context[0] = packet;
0592 
0593     /* Copy MAD header.  Any RMPP header is already in place. */
0594     memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
0595 
0596     if (!rmpp_active) {
0597         if (copy_from_user(packet->msg->mad + copy_offset,
0598                    buf + copy_offset,
0599                    hdr_len + data_len - copy_offset)) {
0600             ret = -EFAULT;
0601             goto err_msg;
0602         }
0603     } else {
0604         ret = copy_rmpp_mad(packet->msg, buf);
0605         if (ret)
0606             goto err_msg;
0607     }
0608 
0609     /*
0610      * Set the high-order part of the transaction ID to make MADs from
0611      * different agents unique, and allow routing responses back to the
0612      * original requestor.
0613      */
0614     if (!ib_response_mad(packet->msg->mad)) {
0615         tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
0616         *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
0617                    (be64_to_cpup(tid) & 0xffffffff));
0618         rmpp_mad->mad_hdr.tid = *tid;
0619     }
0620 
0621     if (!ib_mad_kernel_rmpp_agent(agent)
0622        && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
0623        && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
0624         spin_lock_irq(&file->send_lock);
0625         list_add_tail(&packet->list, &file->send_list);
0626         spin_unlock_irq(&file->send_lock);
0627     } else {
0628         spin_lock_irq(&file->send_lock);
0629         ret = is_duplicate(file, packet);
0630         if (!ret)
0631             list_add_tail(&packet->list, &file->send_list);
0632         spin_unlock_irq(&file->send_lock);
0633         if (ret) {
0634             ret = -EINVAL;
0635             goto err_msg;
0636         }
0637     }
0638 
0639     ret = ib_post_send_mad(packet->msg, NULL);
0640     if (ret)
0641         goto err_send;
0642 
0643     mutex_unlock(&file->mutex);
0644     return count;
0645 
0646 err_send:
0647     dequeue_send(file, packet);
0648 err_msg:
0649     ib_free_send_mad(packet->msg);
0650 err_ah:
0651     rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
0652 err_up:
0653     mutex_unlock(&file->mutex);
0654 err:
0655     kfree(packet);
0656     return ret;
0657 }
0658 
0659 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
0660 {
0661     struct ib_umad_file *file = filp->private_data;
0662 
0663     /* we will always be able to post a MAD send */
0664     __poll_t mask = EPOLLOUT | EPOLLWRNORM;
0665 
0666     mutex_lock(&file->mutex);
0667     poll_wait(filp, &file->recv_wait, wait);
0668 
0669     if (!list_empty(&file->recv_list))
0670         mask |= EPOLLIN | EPOLLRDNORM;
0671     if (file->agents_dead)
0672         mask = EPOLLERR;
0673     mutex_unlock(&file->mutex);
0674 
0675     return mask;
0676 }
0677 
0678 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
0679                  int compat_method_mask)
0680 {
0681     struct ib_user_mad_reg_req ureq;
0682     struct ib_mad_reg_req req;
0683     struct ib_mad_agent *agent = NULL;
0684     int agent_id;
0685     int ret;
0686 
0687     mutex_lock(&file->port->file_mutex);
0688     mutex_lock(&file->mutex);
0689 
0690     if (!file->port->ib_dev) {
0691         dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
0692         ret = -EPIPE;
0693         goto out;
0694     }
0695 
0696     if (copy_from_user(&ureq, arg, sizeof ureq)) {
0697         ret = -EFAULT;
0698         goto out;
0699     }
0700 
0701     if (ureq.qpn != 0 && ureq.qpn != 1) {
0702         dev_notice(&file->port->dev,
0703                "%s: invalid QPN %u specified\n", __func__,
0704                ureq.qpn);
0705         ret = -EINVAL;
0706         goto out;
0707     }
0708 
0709     for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
0710         if (!__get_agent(file, agent_id))
0711             goto found;
0712 
0713     dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
0714            IB_UMAD_MAX_AGENTS);
0715 
0716     ret = -ENOMEM;
0717     goto out;
0718 
0719 found:
0720     if (ureq.mgmt_class) {
0721         memset(&req, 0, sizeof(req));
0722         req.mgmt_class         = ureq.mgmt_class;
0723         req.mgmt_class_version = ureq.mgmt_class_version;
0724         memcpy(req.oui, ureq.oui, sizeof req.oui);
0725 
0726         if (compat_method_mask) {
0727             u32 *umm = (u32 *) ureq.method_mask;
0728             int i;
0729 
0730             for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
0731                 req.method_mask[i] =
0732                     umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
0733         } else
0734             memcpy(req.method_mask, ureq.method_mask,
0735                    sizeof req.method_mask);
0736     }
0737 
0738     agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
0739                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
0740                       ureq.mgmt_class ? &req : NULL,
0741                       ureq.rmpp_version,
0742                       send_handler, recv_handler, file, 0);
0743     if (IS_ERR(agent)) {
0744         ret = PTR_ERR(agent);
0745         agent = NULL;
0746         goto out;
0747     }
0748 
0749     if (put_user(agent_id,
0750              (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
0751         ret = -EFAULT;
0752         goto out;
0753     }
0754 
0755     if (!file->already_used) {
0756         file->already_used = 1;
0757         if (!file->use_pkey_index) {
0758             dev_warn(&file->port->dev,
0759                 "process %s did not enable P_Key index support.\n",
0760                 current->comm);
0761             dev_warn(&file->port->dev,
0762                 "   Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
0763         }
0764     }
0765 
0766     file->agent[agent_id] = agent;
0767     ret = 0;
0768 
0769 out:
0770     mutex_unlock(&file->mutex);
0771 
0772     if (ret && agent)
0773         ib_unregister_mad_agent(agent);
0774 
0775     mutex_unlock(&file->port->file_mutex);
0776 
0777     return ret;
0778 }
0779 
0780 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
0781 {
0782     struct ib_user_mad_reg_req2 ureq;
0783     struct ib_mad_reg_req req;
0784     struct ib_mad_agent *agent = NULL;
0785     int agent_id;
0786     int ret;
0787 
0788     mutex_lock(&file->port->file_mutex);
0789     mutex_lock(&file->mutex);
0790 
0791     if (!file->port->ib_dev) {
0792         dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
0793         ret = -EPIPE;
0794         goto out;
0795     }
0796 
0797     if (copy_from_user(&ureq, arg, sizeof(ureq))) {
0798         ret = -EFAULT;
0799         goto out;
0800     }
0801 
0802     if (ureq.qpn != 0 && ureq.qpn != 1) {
0803         dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n",
0804                __func__, ureq.qpn);
0805         ret = -EINVAL;
0806         goto out;
0807     }
0808 
0809     if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
0810         dev_notice(&file->port->dev,
0811                "%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",
0812                __func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
0813         ret = -EINVAL;
0814 
0815         if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
0816                 (u32 __user *) (arg + offsetof(struct
0817                 ib_user_mad_reg_req2, flags))))
0818             ret = -EFAULT;
0819 
0820         goto out;
0821     }
0822 
0823     for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
0824         if (!__get_agent(file, agent_id))
0825             goto found;
0826 
0827     dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
0828            IB_UMAD_MAX_AGENTS);
0829     ret = -ENOMEM;
0830     goto out;
0831 
0832 found:
0833     if (ureq.mgmt_class) {
0834         memset(&req, 0, sizeof(req));
0835         req.mgmt_class         = ureq.mgmt_class;
0836         req.mgmt_class_version = ureq.mgmt_class_version;
0837         if (ureq.oui & 0xff000000) {
0838             dev_notice(&file->port->dev,
0839                    "%s failed: oui invalid 0x%08x\n", __func__,
0840                    ureq.oui);
0841             ret = -EINVAL;
0842             goto out;
0843         }
0844         req.oui[2] =  ureq.oui & 0x0000ff;
0845         req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
0846         req.oui[0] = (ureq.oui & 0xff0000) >> 16;
0847         memcpy(req.method_mask, ureq.method_mask,
0848             sizeof(req.method_mask));
0849     }
0850 
0851     agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
0852                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
0853                       ureq.mgmt_class ? &req : NULL,
0854                       ureq.rmpp_version,
0855                       send_handler, recv_handler, file,
0856                       ureq.flags);
0857     if (IS_ERR(agent)) {
0858         ret = PTR_ERR(agent);
0859         agent = NULL;
0860         goto out;
0861     }
0862 
0863     if (put_user(agent_id,
0864              (u32 __user *)(arg +
0865                 offsetof(struct ib_user_mad_reg_req2, id)))) {
0866         ret = -EFAULT;
0867         goto out;
0868     }
0869 
0870     if (!file->already_used) {
0871         file->already_used = 1;
0872         file->use_pkey_index = 1;
0873     }
0874 
0875     file->agent[agent_id] = agent;
0876     ret = 0;
0877 
0878 out:
0879     mutex_unlock(&file->mutex);
0880 
0881     if (ret && agent)
0882         ib_unregister_mad_agent(agent);
0883 
0884     mutex_unlock(&file->port->file_mutex);
0885 
0886     return ret;
0887 }
0888 
0889 
0890 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
0891 {
0892     struct ib_mad_agent *agent = NULL;
0893     u32 id;
0894     int ret = 0;
0895 
0896     if (get_user(id, arg))
0897         return -EFAULT;
0898     if (id >= IB_UMAD_MAX_AGENTS)
0899         return -EINVAL;
0900 
0901     mutex_lock(&file->port->file_mutex);
0902     mutex_lock(&file->mutex);
0903 
0904     id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
0905     if (!__get_agent(file, id)) {
0906         ret = -EINVAL;
0907         goto out;
0908     }
0909 
0910     agent = file->agent[id];
0911     file->agent[id] = NULL;
0912 
0913 out:
0914     mutex_unlock(&file->mutex);
0915 
0916     if (agent)
0917         ib_unregister_mad_agent(agent);
0918 
0919     mutex_unlock(&file->port->file_mutex);
0920 
0921     return ret;
0922 }
0923 
0924 static long ib_umad_enable_pkey(struct ib_umad_file *file)
0925 {
0926     int ret = 0;
0927 
0928     mutex_lock(&file->mutex);
0929     if (file->already_used)
0930         ret = -EINVAL;
0931     else
0932         file->use_pkey_index = 1;
0933     mutex_unlock(&file->mutex);
0934 
0935     return ret;
0936 }
0937 
0938 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
0939               unsigned long arg)
0940 {
0941     switch (cmd) {
0942     case IB_USER_MAD_REGISTER_AGENT:
0943         return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
0944     case IB_USER_MAD_UNREGISTER_AGENT:
0945         return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
0946     case IB_USER_MAD_ENABLE_PKEY:
0947         return ib_umad_enable_pkey(filp->private_data);
0948     case IB_USER_MAD_REGISTER_AGENT2:
0949         return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
0950     default:
0951         return -ENOIOCTLCMD;
0952     }
0953 }
0954 
0955 #ifdef CONFIG_COMPAT
0956 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
0957                  unsigned long arg)
0958 {
0959     switch (cmd) {
0960     case IB_USER_MAD_REGISTER_AGENT:
0961         return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
0962     case IB_USER_MAD_UNREGISTER_AGENT:
0963         return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
0964     case IB_USER_MAD_ENABLE_PKEY:
0965         return ib_umad_enable_pkey(filp->private_data);
0966     case IB_USER_MAD_REGISTER_AGENT2:
0967         return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
0968     default:
0969         return -ENOIOCTLCMD;
0970     }
0971 }
0972 #endif
0973 
0974 /*
0975  * ib_umad_open() does not need the BKL:
0976  *
0977  *  - the ib_umad_port structures are properly reference counted, and
0978  *    everything else is purely local to the file being created, so
0979  *    races against other open calls are not a problem;
0980  *  - the ioctl method does not affect any global state outside of the
0981  *    file structure being operated on;
0982  */
0983 static int ib_umad_open(struct inode *inode, struct file *filp)
0984 {
0985     struct ib_umad_port *port;
0986     struct ib_umad_file *file;
0987     int ret = 0;
0988 
0989     port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
0990 
0991     mutex_lock(&port->file_mutex);
0992 
0993     if (!port->ib_dev) {
0994         ret = -ENXIO;
0995         goto out;
0996     }
0997 
0998     if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
0999         ret = -EPERM;
1000         goto out;
1001     }
1002 
1003     file = kzalloc(sizeof(*file), GFP_KERNEL);
1004     if (!file) {
1005         ret = -ENOMEM;
1006         goto out;
1007     }
1008 
1009     mutex_init(&file->mutex);
1010     spin_lock_init(&file->send_lock);
1011     INIT_LIST_HEAD(&file->recv_list);
1012     INIT_LIST_HEAD(&file->send_list);
1013     init_waitqueue_head(&file->recv_wait);
1014 
1015     file->port = port;
1016     filp->private_data = file;
1017 
1018     list_add_tail(&file->port_list, &port->file_list);
1019 
1020     stream_open(inode, filp);
1021 out:
1022     mutex_unlock(&port->file_mutex);
1023     return ret;
1024 }
1025 
1026 static int ib_umad_close(struct inode *inode, struct file *filp)
1027 {
1028     struct ib_umad_file *file = filp->private_data;
1029     struct ib_umad_packet *packet, *tmp;
1030     int already_dead;
1031     int i;
1032 
1033     mutex_lock(&file->port->file_mutex);
1034     mutex_lock(&file->mutex);
1035 
1036     already_dead = file->agents_dead;
1037     file->agents_dead = 1;
1038 
1039     list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1040         if (packet->recv_wc)
1041             ib_free_recv_mad(packet->recv_wc);
1042         kfree(packet);
1043     }
1044 
1045     list_del(&file->port_list);
1046 
1047     mutex_unlock(&file->mutex);
1048 
1049     if (!already_dead)
1050         for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1051             if (file->agent[i])
1052                 ib_unregister_mad_agent(file->agent[i]);
1053 
1054     mutex_unlock(&file->port->file_mutex);
1055     mutex_destroy(&file->mutex);
1056     kfree(file);
1057     return 0;
1058 }
1059 
1060 static const struct file_operations umad_fops = {
1061     .owner      = THIS_MODULE,
1062     .read       = ib_umad_read,
1063     .write      = ib_umad_write,
1064     .poll       = ib_umad_poll,
1065     .unlocked_ioctl = ib_umad_ioctl,
1066 #ifdef CONFIG_COMPAT
1067     .compat_ioctl   = ib_umad_compat_ioctl,
1068 #endif
1069     .open       = ib_umad_open,
1070     .release    = ib_umad_close,
1071     .llseek     = no_llseek,
1072 };
1073 
1074 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1075 {
1076     struct ib_umad_port *port;
1077     struct ib_port_modify props = {
1078         .set_port_cap_mask = IB_PORT_SM
1079     };
1080     int ret;
1081 
1082     port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1083 
1084     if (filp->f_flags & O_NONBLOCK) {
1085         if (down_trylock(&port->sm_sem)) {
1086             ret = -EAGAIN;
1087             goto fail;
1088         }
1089     } else {
1090         if (down_interruptible(&port->sm_sem)) {
1091             ret = -ERESTARTSYS;
1092             goto fail;
1093         }
1094     }
1095 
1096     if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1097         ret = -EPERM;
1098         goto err_up_sem;
1099     }
1100 
1101     ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1102     if (ret)
1103         goto err_up_sem;
1104 
1105     filp->private_data = port;
1106 
1107     nonseekable_open(inode, filp);
1108     return 0;
1109 
1110 err_up_sem:
1111     up(&port->sm_sem);
1112 
1113 fail:
1114     return ret;
1115 }
1116 
1117 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1118 {
1119     struct ib_umad_port *port = filp->private_data;
1120     struct ib_port_modify props = {
1121         .clr_port_cap_mask = IB_PORT_SM
1122     };
1123     int ret = 0;
1124 
1125     mutex_lock(&port->file_mutex);
1126     if (port->ib_dev)
1127         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1128     mutex_unlock(&port->file_mutex);
1129 
1130     up(&port->sm_sem);
1131 
1132     return ret;
1133 }
1134 
1135 static const struct file_operations umad_sm_fops = {
1136     .owner   = THIS_MODULE,
1137     .open    = ib_umad_sm_open,
1138     .release = ib_umad_sm_close,
1139     .llseek  = no_llseek,
1140 };
1141 
1142 static struct ib_umad_port *get_port(struct ib_device *ibdev,
1143                      struct ib_umad_device *umad_dev,
1144                      u32 port)
1145 {
1146     if (!umad_dev)
1147         return ERR_PTR(-EOPNOTSUPP);
1148     if (!rdma_is_port_valid(ibdev, port))
1149         return ERR_PTR(-EINVAL);
1150     if (!rdma_cap_ib_mad(ibdev, port))
1151         return ERR_PTR(-EOPNOTSUPP);
1152 
1153     return &umad_dev->ports[port - rdma_start_port(ibdev)];
1154 }
1155 
1156 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1157                    struct ib_client_nl_info *res)
1158 {
1159     struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1160 
1161     if (IS_ERR(port))
1162         return PTR_ERR(port);
1163 
1164     res->abi = IB_USER_MAD_ABI_VERSION;
1165     res->cdev = &port->dev;
1166     return 0;
1167 }
1168 
1169 static struct ib_client umad_client = {
1170     .name   = "umad",
1171     .add    = ib_umad_add_one,
1172     .remove = ib_umad_remove_one,
1173     .get_nl_info = ib_umad_get_nl_info,
1174 };
1175 MODULE_ALIAS_RDMA_CLIENT("umad");
1176 
1177 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1178                    struct ib_client_nl_info *res)
1179 {
1180     struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1181 
1182     if (IS_ERR(port))
1183         return PTR_ERR(port);
1184 
1185     res->abi = IB_USER_MAD_ABI_VERSION;
1186     res->cdev = &port->sm_dev;
1187     return 0;
1188 }
1189 
1190 static struct ib_client issm_client = {
1191     .name = "issm",
1192     .get_nl_info = ib_issm_get_nl_info,
1193 };
1194 MODULE_ALIAS_RDMA_CLIENT("issm");
1195 
1196 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1197               char *buf)
1198 {
1199     struct ib_umad_port *port = dev_get_drvdata(dev);
1200 
1201     if (!port)
1202         return -ENODEV;
1203 
1204     return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev));
1205 }
1206 static DEVICE_ATTR_RO(ibdev);
1207 
1208 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1209              char *buf)
1210 {
1211     struct ib_umad_port *port = dev_get_drvdata(dev);
1212 
1213     if (!port)
1214         return -ENODEV;
1215 
1216     return sysfs_emit(buf, "%d\n", port->port_num);
1217 }
1218 static DEVICE_ATTR_RO(port);
1219 
1220 static struct attribute *umad_class_dev_attrs[] = {
1221     &dev_attr_ibdev.attr,
1222     &dev_attr_port.attr,
1223     NULL,
1224 };
1225 ATTRIBUTE_GROUPS(umad_class_dev);
1226 
1227 static char *umad_devnode(struct device *dev, umode_t *mode)
1228 {
1229     return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1230 }
1231 
1232 static ssize_t abi_version_show(struct class *class,
1233                 struct class_attribute *attr, char *buf)
1234 {
1235     return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1236 }
1237 static CLASS_ATTR_RO(abi_version);
1238 
1239 static struct attribute *umad_class_attrs[] = {
1240     &class_attr_abi_version.attr,
1241     NULL,
1242 };
1243 ATTRIBUTE_GROUPS(umad_class);
1244 
1245 static struct class umad_class = {
1246     .name       = "infiniband_mad",
1247     .devnode    = umad_devnode,
1248     .class_groups   = umad_class_groups,
1249     .dev_groups = umad_class_dev_groups,
1250 };
1251 
1252 static void ib_umad_release_port(struct device *device)
1253 {
1254     struct ib_umad_port *port = dev_get_drvdata(device);
1255     struct ib_umad_device *umad_dev = port->umad_dev;
1256 
1257     ib_umad_dev_put(umad_dev);
1258 }
1259 
1260 static void ib_umad_init_port_dev(struct device *dev,
1261                   struct ib_umad_port *port,
1262                   const struct ib_device *device)
1263 {
1264     device_initialize(dev);
1265     ib_umad_dev_get(port->umad_dev);
1266     dev->class = &umad_class;
1267     dev->parent = device->dev.parent;
1268     dev_set_drvdata(dev, port);
1269     dev->release = ib_umad_release_port;
1270 }
1271 
1272 static int ib_umad_init_port(struct ib_device *device, int port_num,
1273                  struct ib_umad_device *umad_dev,
1274                  struct ib_umad_port *port)
1275 {
1276     int devnum;
1277     dev_t base_umad;
1278     dev_t base_issm;
1279     int ret;
1280 
1281     devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1282     if (devnum < 0)
1283         return -1;
1284     port->dev_num = devnum;
1285     if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1286         base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1287         base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1288     } else {
1289         base_umad = devnum + base_umad_dev;
1290         base_issm = devnum + base_issm_dev;
1291     }
1292 
1293     port->ib_dev   = device;
1294     port->umad_dev = umad_dev;
1295     port->port_num = port_num;
1296     sema_init(&port->sm_sem, 1);
1297     mutex_init(&port->file_mutex);
1298     INIT_LIST_HEAD(&port->file_list);
1299 
1300     ib_umad_init_port_dev(&port->dev, port, device);
1301     port->dev.devt = base_umad;
1302     dev_set_name(&port->dev, "umad%d", port->dev_num);
1303     cdev_init(&port->cdev, &umad_fops);
1304     port->cdev.owner = THIS_MODULE;
1305 
1306     ret = cdev_device_add(&port->cdev, &port->dev);
1307     if (ret)
1308         goto err_cdev;
1309 
1310     ib_umad_init_port_dev(&port->sm_dev, port, device);
1311     port->sm_dev.devt = base_issm;
1312     dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1313     cdev_init(&port->sm_cdev, &umad_sm_fops);
1314     port->sm_cdev.owner = THIS_MODULE;
1315 
1316     ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1317     if (ret)
1318         goto err_dev;
1319 
1320     return 0;
1321 
1322 err_dev:
1323     put_device(&port->sm_dev);
1324     cdev_device_del(&port->cdev, &port->dev);
1325 err_cdev:
1326     put_device(&port->dev);
1327     ida_free(&umad_ida, devnum);
1328     return ret;
1329 }
1330 
1331 static void ib_umad_kill_port(struct ib_umad_port *port)
1332 {
1333     struct ib_umad_file *file;
1334     int id;
1335 
1336     cdev_device_del(&port->sm_cdev, &port->sm_dev);
1337     cdev_device_del(&port->cdev, &port->dev);
1338 
1339     mutex_lock(&port->file_mutex);
1340 
1341     /* Mark ib_dev NULL and block ioctl or other file ops to progress
1342      * further.
1343      */
1344     port->ib_dev = NULL;
1345 
1346     list_for_each_entry(file, &port->file_list, port_list) {
1347         mutex_lock(&file->mutex);
1348         file->agents_dead = 1;
1349         wake_up_interruptible(&file->recv_wait);
1350         mutex_unlock(&file->mutex);
1351 
1352         for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1353             if (file->agent[id])
1354                 ib_unregister_mad_agent(file->agent[id]);
1355     }
1356 
1357     mutex_unlock(&port->file_mutex);
1358 
1359     ida_free(&umad_ida, port->dev_num);
1360 
1361     /* balances device_initialize() */
1362     put_device(&port->sm_dev);
1363     put_device(&port->dev);
1364 }
1365 
1366 static int ib_umad_add_one(struct ib_device *device)
1367 {
1368     struct ib_umad_device *umad_dev;
1369     int s, e, i;
1370     int count = 0;
1371     int ret;
1372 
1373     s = rdma_start_port(device);
1374     e = rdma_end_port(device);
1375 
1376     umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
1377     if (!umad_dev)
1378         return -ENOMEM;
1379 
1380     kref_init(&umad_dev->kref);
1381     for (i = s; i <= e; ++i) {
1382         if (!rdma_cap_ib_mad(device, i))
1383             continue;
1384 
1385         ret = ib_umad_init_port(device, i, umad_dev,
1386                     &umad_dev->ports[i - s]);
1387         if (ret)
1388             goto err;
1389 
1390         count++;
1391     }
1392 
1393     if (!count) {
1394         ret = -EOPNOTSUPP;
1395         goto free;
1396     }
1397 
1398     ib_set_client_data(device, &umad_client, umad_dev);
1399 
1400     return 0;
1401 
1402 err:
1403     while (--i >= s) {
1404         if (!rdma_cap_ib_mad(device, i))
1405             continue;
1406 
1407         ib_umad_kill_port(&umad_dev->ports[i - s]);
1408     }
1409 free:
1410     /* balances kref_init */
1411     ib_umad_dev_put(umad_dev);
1412     return ret;
1413 }
1414 
1415 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1416 {
1417     struct ib_umad_device *umad_dev = client_data;
1418     unsigned int i;
1419 
1420     rdma_for_each_port (device, i) {
1421         if (rdma_cap_ib_mad(device, i))
1422             ib_umad_kill_port(
1423                 &umad_dev->ports[i - rdma_start_port(device)]);
1424     }
1425     /* balances kref_init() */
1426     ib_umad_dev_put(umad_dev);
1427 }
1428 
1429 static int __init ib_umad_init(void)
1430 {
1431     int ret;
1432 
1433     ret = register_chrdev_region(base_umad_dev,
1434                      IB_UMAD_NUM_FIXED_MINOR * 2,
1435                      umad_class.name);
1436     if (ret) {
1437         pr_err("couldn't register device number\n");
1438         goto out;
1439     }
1440 
1441     ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1442                   IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1443                   umad_class.name);
1444     if (ret) {
1445         pr_err("couldn't register dynamic device number\n");
1446         goto out_alloc;
1447     }
1448     dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1449 
1450     ret = class_register(&umad_class);
1451     if (ret) {
1452         pr_err("couldn't create class infiniband_mad\n");
1453         goto out_chrdev;
1454     }
1455 
1456     ret = ib_register_client(&umad_client);
1457     if (ret)
1458         goto out_class;
1459 
1460     ret = ib_register_client(&issm_client);
1461     if (ret)
1462         goto out_client;
1463 
1464     return 0;
1465 
1466 out_client:
1467     ib_unregister_client(&umad_client);
1468 out_class:
1469     class_unregister(&umad_class);
1470 
1471 out_chrdev:
1472     unregister_chrdev_region(dynamic_umad_dev,
1473                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1474 
1475 out_alloc:
1476     unregister_chrdev_region(base_umad_dev,
1477                  IB_UMAD_NUM_FIXED_MINOR * 2);
1478 
1479 out:
1480     return ret;
1481 }
1482 
1483 static void __exit ib_umad_cleanup(void)
1484 {
1485     ib_unregister_client(&issm_client);
1486     ib_unregister_client(&umad_client);
1487     class_unregister(&umad_class);
1488     unregister_chrdev_region(base_umad_dev,
1489                  IB_UMAD_NUM_FIXED_MINOR * 2);
1490     unregister_chrdev_region(dynamic_umad_dev,
1491                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1492 }
1493 
1494 module_init(ib_umad_init);
1495 module_exit(ib_umad_cleanup);
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