2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5 * Copyright (c) 2008 Cisco. All rights reserved.
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
41 #include <linux/cdev.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/kref.h>
46 #include <linux/compat.h>
47 #include <linux/sched.h>
48 #include <linux/semaphore.h>
49 #include <linux/slab.h>
51 #include <asm/uaccess.h>
53 #include <rdma/ib_mad.h>
54 #include <rdma/ib_user_mad.h>
56 MODULE_AUTHOR("Roland Dreier");
57 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
58 MODULE_LICENSE("Dual BSD/GPL");
61 IB_UMAD_MAX_PORTS = 64,
62 IB_UMAD_MAX_AGENTS = 32,
65 IB_UMAD_MINOR_BASE = 0
69 * Our lifetime rules for these structs are the following:
70 * device special file is opened, we take a reference on the
71 * ib_umad_port's struct ib_umad_device. We drop these
72 * references in the corresponding close().
74 * In addition to references coming from open character devices, there
75 * is one more reference to each ib_umad_device representing the
76 * module's reference taken when allocating the ib_umad_device in
79 * When destroying an ib_umad_device, we drop the module's reference.
87 struct device *sm_dev;
88 struct semaphore sm_sem;
90 struct mutex file_mutex;
91 struct list_head file_list;
93 struct ib_device *ib_dev;
94 struct ib_umad_device *umad_dev;
99 struct ib_umad_device {
100 int start_port, end_port;
102 struct ib_umad_port port[0];
105 struct ib_umad_file {
107 struct ib_umad_port *port;
108 struct list_head recv_list;
109 struct list_head send_list;
110 struct list_head port_list;
111 spinlock_t send_lock;
112 wait_queue_head_t recv_wait;
113 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
119 struct ib_umad_packet {
120 struct ib_mad_send_buf *msg;
121 struct ib_mad_recv_wc *recv_wc;
122 struct list_head list;
124 struct ib_user_mad mad;
127 static struct class *umad_class;
129 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
131 static DEFINE_SPINLOCK(port_lock);
132 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
134 static void ib_umad_add_one(struct ib_device *device);
135 static void ib_umad_remove_one(struct ib_device *device);
137 static void ib_umad_release_dev(struct kref *ref)
139 struct ib_umad_device *dev =
140 container_of(ref, struct ib_umad_device, ref);
145 static int hdr_size(struct ib_umad_file *file)
147 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
148 sizeof (struct ib_user_mad_hdr_old);
151 /* caller must hold file->mutex */
152 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
154 return file->agents_dead ? NULL : file->agent[id];
157 static int queue_packet(struct ib_umad_file *file,
158 struct ib_mad_agent *agent,
159 struct ib_umad_packet *packet)
163 mutex_lock(&file->mutex);
165 for (packet->mad.hdr.id = 0;
166 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
167 packet->mad.hdr.id++)
168 if (agent == __get_agent(file, packet->mad.hdr.id)) {
169 list_add_tail(&packet->list, &file->recv_list);
170 wake_up_interruptible(&file->recv_wait);
175 mutex_unlock(&file->mutex);
180 static void dequeue_send(struct ib_umad_file *file,
181 struct ib_umad_packet *packet)
183 spin_lock_irq(&file->send_lock);
184 list_del(&packet->list);
185 spin_unlock_irq(&file->send_lock);
188 static void send_handler(struct ib_mad_agent *agent,
189 struct ib_mad_send_wc *send_wc)
191 struct ib_umad_file *file = agent->context;
192 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
194 dequeue_send(file, packet);
195 ib_destroy_ah(packet->msg->ah);
196 ib_free_send_mad(packet->msg);
198 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
199 packet->length = IB_MGMT_MAD_HDR;
200 packet->mad.hdr.status = ETIMEDOUT;
201 if (!queue_packet(file, agent, packet))
207 static void recv_handler(struct ib_mad_agent *agent,
208 struct ib_mad_recv_wc *mad_recv_wc)
210 struct ib_umad_file *file = agent->context;
211 struct ib_umad_packet *packet;
213 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
216 packet = kzalloc(sizeof *packet, GFP_KERNEL);
220 packet->length = mad_recv_wc->mad_len;
221 packet->recv_wc = mad_recv_wc;
223 packet->mad.hdr.status = 0;
224 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
225 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
226 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
227 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
228 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
229 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
230 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
231 if (packet->mad.hdr.grh_present) {
232 struct ib_ah_attr ah_attr;
234 ib_init_ah_from_wc(agent->device, agent->port_num,
235 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
238 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
239 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
240 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
241 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
242 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
245 if (queue_packet(file, agent, packet))
252 ib_free_recv_mad(mad_recv_wc);
255 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
256 struct ib_umad_packet *packet, size_t count)
258 struct ib_mad_recv_buf *recv_buf;
259 int left, seg_payload, offset, max_seg_payload;
261 /* We need enough room to copy the first (or only) MAD segment. */
262 recv_buf = &packet->recv_wc->recv_buf;
263 if ((packet->length <= sizeof (*recv_buf->mad) &&
264 count < hdr_size(file) + packet->length) ||
265 (packet->length > sizeof (*recv_buf->mad) &&
266 count < hdr_size(file) + sizeof (*recv_buf->mad)))
269 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
272 buf += hdr_size(file);
273 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
274 if (copy_to_user(buf, recv_buf->mad, seg_payload))
277 if (seg_payload < packet->length) {
279 * Multipacket RMPP MAD message. Copy remainder of message.
280 * Note that last segment may have a shorter payload.
282 if (count < hdr_size(file) + packet->length) {
284 * The buffer is too small, return the first RMPP segment,
285 * which includes the RMPP message length.
289 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
290 max_seg_payload = sizeof (struct ib_mad) - offset;
292 for (left = packet->length - seg_payload, buf += seg_payload;
293 left; left -= seg_payload, buf += seg_payload) {
294 recv_buf = container_of(recv_buf->list.next,
295 struct ib_mad_recv_buf, list);
296 seg_payload = min(left, max_seg_payload);
297 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
302 return hdr_size(file) + packet->length;
305 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
306 struct ib_umad_packet *packet, size_t count)
308 ssize_t size = hdr_size(file) + packet->length;
313 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
316 buf += hdr_size(file);
318 if (copy_to_user(buf, packet->mad.data, packet->length))
324 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
325 size_t count, loff_t *pos)
327 struct ib_umad_file *file = filp->private_data;
328 struct ib_umad_packet *packet;
331 if (count < hdr_size(file))
334 mutex_lock(&file->mutex);
336 while (list_empty(&file->recv_list)) {
337 mutex_unlock(&file->mutex);
339 if (filp->f_flags & O_NONBLOCK)
342 if (wait_event_interruptible(file->recv_wait,
343 !list_empty(&file->recv_list)))
346 mutex_lock(&file->mutex);
349 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
350 list_del(&packet->list);
352 mutex_unlock(&file->mutex);
355 ret = copy_recv_mad(file, buf, packet, count);
357 ret = copy_send_mad(file, buf, packet, count);
361 mutex_lock(&file->mutex);
362 list_add(&packet->list, &file->recv_list);
363 mutex_unlock(&file->mutex);
366 ib_free_recv_mad(packet->recv_wc);
372 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
376 /* Copy class specific header */
377 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
378 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
379 msg->hdr_len - IB_MGMT_RMPP_HDR))
382 /* All headers are in place. Copy data segments. */
383 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
384 seg++, left -= msg->seg_size, buf += msg->seg_size) {
385 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
386 min(left, msg->seg_size)))
392 static int same_destination(struct ib_user_mad_hdr *hdr1,
393 struct ib_user_mad_hdr *hdr2)
395 if (!hdr1->grh_present && !hdr2->grh_present)
396 return (hdr1->lid == hdr2->lid);
398 if (hdr1->grh_present && hdr2->grh_present)
399 return !memcmp(hdr1->gid, hdr2->gid, 16);
404 static int is_duplicate(struct ib_umad_file *file,
405 struct ib_umad_packet *packet)
407 struct ib_umad_packet *sent_packet;
408 struct ib_mad_hdr *sent_hdr, *hdr;
410 hdr = (struct ib_mad_hdr *) packet->mad.data;
411 list_for_each_entry(sent_packet, &file->send_list, list) {
412 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
414 if ((hdr->tid != sent_hdr->tid) ||
415 (hdr->mgmt_class != sent_hdr->mgmt_class))
419 * No need to be overly clever here. If two new operations have
420 * the same TID, reject the second as a duplicate. This is more
421 * restrictive than required by the spec.
423 if (!ib_response_mad((struct ib_mad *) hdr)) {
424 if (!ib_response_mad((struct ib_mad *) sent_hdr))
427 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
430 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
437 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
438 size_t count, loff_t *pos)
440 struct ib_umad_file *file = filp->private_data;
441 struct ib_umad_packet *packet;
442 struct ib_mad_agent *agent;
443 struct ib_ah_attr ah_attr;
445 struct ib_rmpp_mad *rmpp_mad;
447 int ret, data_len, hdr_len, copy_offset, rmpp_active;
449 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
452 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
456 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
461 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
466 buf += hdr_size(file);
468 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
473 mutex_lock(&file->mutex);
475 agent = __get_agent(file, packet->mad.hdr.id);
481 memset(&ah_attr, 0, sizeof ah_attr);
482 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
483 ah_attr.sl = packet->mad.hdr.sl;
484 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
485 ah_attr.port_num = file->port->port_num;
486 if (packet->mad.hdr.grh_present) {
487 ah_attr.ah_flags = IB_AH_GRH;
488 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
489 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
490 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
491 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
492 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
495 ah = ib_create_ah(agent->qp->pd, &ah_attr);
501 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
502 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
503 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
504 copy_offset = IB_MGMT_MAD_HDR;
507 copy_offset = IB_MGMT_RMPP_HDR;
508 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
509 IB_MGMT_RMPP_FLAG_ACTIVE;
512 data_len = count - hdr_size(file) - hdr_len;
513 packet->msg = ib_create_send_mad(agent,
514 be32_to_cpu(packet->mad.hdr.qpn),
515 packet->mad.hdr.pkey_index, rmpp_active,
516 hdr_len, data_len, GFP_KERNEL);
517 if (IS_ERR(packet->msg)) {
518 ret = PTR_ERR(packet->msg);
522 packet->msg->ah = ah;
523 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
524 packet->msg->retries = packet->mad.hdr.retries;
525 packet->msg->context[0] = packet;
527 /* Copy MAD header. Any RMPP header is already in place. */
528 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
531 if (copy_from_user(packet->msg->mad + copy_offset,
533 hdr_len + data_len - copy_offset)) {
538 ret = copy_rmpp_mad(packet->msg, buf);
544 * Set the high-order part of the transaction ID to make MADs from
545 * different agents unique, and allow routing responses back to the
546 * original requestor.
548 if (!ib_response_mad(packet->msg->mad)) {
549 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
550 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
551 (be64_to_cpup(tid) & 0xffffffff));
552 rmpp_mad->mad_hdr.tid = *tid;
555 spin_lock_irq(&file->send_lock);
556 ret = is_duplicate(file, packet);
558 list_add_tail(&packet->list, &file->send_list);
559 spin_unlock_irq(&file->send_lock);
565 ret = ib_post_send_mad(packet->msg, NULL);
569 mutex_unlock(&file->mutex);
573 dequeue_send(file, packet);
575 ib_free_send_mad(packet->msg);
579 mutex_unlock(&file->mutex);
585 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
587 struct ib_umad_file *file = filp->private_data;
589 /* we will always be able to post a MAD send */
590 unsigned int mask = POLLOUT | POLLWRNORM;
592 poll_wait(filp, &file->recv_wait, wait);
594 if (!list_empty(&file->recv_list))
595 mask |= POLLIN | POLLRDNORM;
600 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
601 int compat_method_mask)
603 struct ib_user_mad_reg_req ureq;
604 struct ib_mad_reg_req req;
605 struct ib_mad_agent *agent = NULL;
609 mutex_lock(&file->port->file_mutex);
610 mutex_lock(&file->mutex);
612 if (!file->port->ib_dev) {
617 if (copy_from_user(&ureq, arg, sizeof ureq)) {
622 if (ureq.qpn != 0 && ureq.qpn != 1) {
627 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
628 if (!__get_agent(file, agent_id))
635 if (ureq.mgmt_class) {
636 req.mgmt_class = ureq.mgmt_class;
637 req.mgmt_class_version = ureq.mgmt_class_version;
638 memcpy(req.oui, ureq.oui, sizeof req.oui);
640 if (compat_method_mask) {
641 u32 *umm = (u32 *) ureq.method_mask;
644 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
646 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
648 memcpy(req.method_mask, ureq.method_mask,
649 sizeof req.method_mask);
652 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
653 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
654 ureq.mgmt_class ? &req : NULL,
656 send_handler, recv_handler, file);
658 ret = PTR_ERR(agent);
663 if (put_user(agent_id,
664 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
669 if (!file->already_used) {
670 file->already_used = 1;
671 if (!file->use_pkey_index) {
672 printk(KERN_WARNING "user_mad: process %s did not enable "
673 "P_Key index support.\n", current->comm);
674 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
675 "has info on the new ABI.\n");
679 file->agent[agent_id] = agent;
683 mutex_unlock(&file->mutex);
686 ib_unregister_mad_agent(agent);
688 mutex_unlock(&file->port->file_mutex);
693 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
695 struct ib_mad_agent *agent = NULL;
699 if (get_user(id, arg))
702 mutex_lock(&file->port->file_mutex);
703 mutex_lock(&file->mutex);
705 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
710 agent = file->agent[id];
711 file->agent[id] = NULL;
714 mutex_unlock(&file->mutex);
717 ib_unregister_mad_agent(agent);
719 mutex_unlock(&file->port->file_mutex);
724 static long ib_umad_enable_pkey(struct ib_umad_file *file)
728 mutex_lock(&file->mutex);
729 if (file->already_used)
732 file->use_pkey_index = 1;
733 mutex_unlock(&file->mutex);
738 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
742 case IB_USER_MAD_REGISTER_AGENT:
743 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
744 case IB_USER_MAD_UNREGISTER_AGENT:
745 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
746 case IB_USER_MAD_ENABLE_PKEY:
747 return ib_umad_enable_pkey(filp->private_data);
754 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
758 case IB_USER_MAD_REGISTER_AGENT:
759 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
760 case IB_USER_MAD_UNREGISTER_AGENT:
761 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
762 case IB_USER_MAD_ENABLE_PKEY:
763 return ib_umad_enable_pkey(filp->private_data);
771 * ib_umad_open() does not need the BKL:
773 * - the ib_umad_port structures are properly reference counted, and
774 * everything else is purely local to the file being created, so
775 * races against other open calls are not a problem;
776 * - the ioctl method does not affect any global state outside of the
777 * file structure being operated on;
779 static int ib_umad_open(struct inode *inode, struct file *filp)
781 struct ib_umad_port *port;
782 struct ib_umad_file *file;
785 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
787 kref_get(&port->umad_dev->ref);
791 mutex_lock(&port->file_mutex);
798 file = kzalloc(sizeof *file, GFP_KERNEL);
800 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
805 mutex_init(&file->mutex);
806 spin_lock_init(&file->send_lock);
807 INIT_LIST_HEAD(&file->recv_list);
808 INIT_LIST_HEAD(&file->send_list);
809 init_waitqueue_head(&file->recv_wait);
812 filp->private_data = file;
814 list_add_tail(&file->port_list, &port->file_list);
816 ret = nonseekable_open(inode, filp);
819 mutex_unlock(&port->file_mutex);
823 static int ib_umad_close(struct inode *inode, struct file *filp)
825 struct ib_umad_file *file = filp->private_data;
826 struct ib_umad_device *dev = file->port->umad_dev;
827 struct ib_umad_packet *packet, *tmp;
831 mutex_lock(&file->port->file_mutex);
832 mutex_lock(&file->mutex);
834 already_dead = file->agents_dead;
835 file->agents_dead = 1;
837 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
839 ib_free_recv_mad(packet->recv_wc);
843 list_del(&file->port_list);
845 mutex_unlock(&file->mutex);
848 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
850 ib_unregister_mad_agent(file->agent[i]);
852 mutex_unlock(&file->port->file_mutex);
855 kref_put(&dev->ref, ib_umad_release_dev);
860 static const struct file_operations umad_fops = {
861 .owner = THIS_MODULE,
862 .read = ib_umad_read,
863 .write = ib_umad_write,
864 .poll = ib_umad_poll,
865 .unlocked_ioctl = ib_umad_ioctl,
867 .compat_ioctl = ib_umad_compat_ioctl,
869 .open = ib_umad_open,
870 .release = ib_umad_close,
874 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
876 struct ib_umad_port *port;
877 struct ib_port_modify props = {
878 .set_port_cap_mask = IB_PORT_SM
882 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
884 kref_get(&port->umad_dev->ref);
888 if (filp->f_flags & O_NONBLOCK) {
889 if (down_trylock(&port->sm_sem)) {
894 if (down_interruptible(&port->sm_sem)) {
900 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
906 filp->private_data = port;
908 return nonseekable_open(inode, filp);
911 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
915 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
917 struct ib_umad_port *port = filp->private_data;
918 struct ib_port_modify props = {
919 .clr_port_cap_mask = IB_PORT_SM
923 mutex_lock(&port->file_mutex);
925 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
926 mutex_unlock(&port->file_mutex);
930 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
935 static const struct file_operations umad_sm_fops = {
936 .owner = THIS_MODULE,
937 .open = ib_umad_sm_open,
938 .release = ib_umad_sm_close,
942 static struct ib_client umad_client = {
944 .add = ib_umad_add_one,
945 .remove = ib_umad_remove_one
948 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
951 struct ib_umad_port *port = dev_get_drvdata(dev);
956 return sprintf(buf, "%s\n", port->ib_dev->name);
958 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
960 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
963 struct ib_umad_port *port = dev_get_drvdata(dev);
968 return sprintf(buf, "%d\n", port->port_num);
970 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
972 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
973 __stringify(IB_USER_MAD_ABI_VERSION));
975 static dev_t overflow_maj;
976 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
977 static int find_overflow_devnum(void)
982 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
985 printk(KERN_ERR "user_mad: couldn't register dynamic device number\n");
990 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
991 if (ret >= IB_UMAD_MAX_PORTS)
997 static int ib_umad_init_port(struct ib_device *device, int port_num,
998 struct ib_umad_port *port)
1003 spin_lock(&port_lock);
1004 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1005 if (devnum >= IB_UMAD_MAX_PORTS) {
1006 spin_unlock(&port_lock);
1007 devnum = find_overflow_devnum();
1011 spin_lock(&port_lock);
1012 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1013 base = devnum + overflow_maj;
1014 set_bit(devnum, overflow_map);
1016 port->dev_num = devnum;
1017 base = devnum + base_dev;
1018 set_bit(devnum, dev_map);
1020 spin_unlock(&port_lock);
1022 port->ib_dev = device;
1023 port->port_num = port_num;
1024 sema_init(&port->sm_sem, 1);
1025 mutex_init(&port->file_mutex);
1026 INIT_LIST_HEAD(&port->file_list);
1028 cdev_init(&port->cdev, &umad_fops);
1029 port->cdev.owner = THIS_MODULE;
1030 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1031 if (cdev_add(&port->cdev, base, 1))
1034 port->dev = device_create(umad_class, device->dma_device,
1035 port->cdev.dev, port,
1036 "umad%d", port->dev_num);
1037 if (IS_ERR(port->dev))
1040 if (device_create_file(port->dev, &dev_attr_ibdev))
1042 if (device_create_file(port->dev, &dev_attr_port))
1045 base += IB_UMAD_MAX_PORTS;
1046 cdev_init(&port->sm_cdev, &umad_sm_fops);
1047 port->sm_cdev.owner = THIS_MODULE;
1048 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1049 if (cdev_add(&port->sm_cdev, base, 1))
1052 port->sm_dev = device_create(umad_class, device->dma_device,
1053 port->sm_cdev.dev, port,
1054 "issm%d", port->dev_num);
1055 if (IS_ERR(port->sm_dev))
1058 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1060 if (device_create_file(port->sm_dev, &dev_attr_port))
1066 device_destroy(umad_class, port->sm_cdev.dev);
1069 cdev_del(&port->sm_cdev);
1072 device_destroy(umad_class, port->cdev.dev);
1075 cdev_del(&port->cdev);
1076 if (port->dev_num < IB_UMAD_MAX_PORTS)
1077 clear_bit(devnum, dev_map);
1079 clear_bit(devnum, overflow_map);
1084 static void ib_umad_kill_port(struct ib_umad_port *port)
1086 struct ib_umad_file *file;
1089 dev_set_drvdata(port->dev, NULL);
1090 dev_set_drvdata(port->sm_dev, NULL);
1092 device_destroy(umad_class, port->cdev.dev);
1093 device_destroy(umad_class, port->sm_cdev.dev);
1095 cdev_del(&port->cdev);
1096 cdev_del(&port->sm_cdev);
1098 mutex_lock(&port->file_mutex);
1100 port->ib_dev = NULL;
1102 list_for_each_entry(file, &port->file_list, port_list) {
1103 mutex_lock(&file->mutex);
1104 file->agents_dead = 1;
1105 mutex_unlock(&file->mutex);
1107 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1108 if (file->agent[id])
1109 ib_unregister_mad_agent(file->agent[id]);
1112 mutex_unlock(&port->file_mutex);
1114 if (port->dev_num < IB_UMAD_MAX_PORTS)
1115 clear_bit(port->dev_num, dev_map);
1117 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1120 static void ib_umad_add_one(struct ib_device *device)
1122 struct ib_umad_device *umad_dev;
1125 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1128 if (device->node_type == RDMA_NODE_IB_SWITCH)
1132 e = device->phys_port_cnt;
1135 umad_dev = kzalloc(sizeof *umad_dev +
1136 (e - s + 1) * sizeof (struct ib_umad_port),
1141 kref_init(&umad_dev->ref);
1143 umad_dev->start_port = s;
1144 umad_dev->end_port = e;
1146 for (i = s; i <= e; ++i) {
1147 umad_dev->port[i - s].umad_dev = umad_dev;
1149 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1153 ib_set_client_data(device, &umad_client, umad_dev);
1159 ib_umad_kill_port(&umad_dev->port[i - s]);
1161 kref_put(&umad_dev->ref, ib_umad_release_dev);
1164 static void ib_umad_remove_one(struct ib_device *device)
1166 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1172 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1173 ib_umad_kill_port(&umad_dev->port[i]);
1175 kref_put(&umad_dev->ref, ib_umad_release_dev);
1178 static char *umad_devnode(struct device *dev, umode_t *mode)
1180 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1183 static int __init ib_umad_init(void)
1187 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1190 printk(KERN_ERR "user_mad: couldn't register device number\n");
1194 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1195 if (IS_ERR(umad_class)) {
1196 ret = PTR_ERR(umad_class);
1197 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1201 umad_class->devnode = umad_devnode;
1203 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1205 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1209 ret = ib_register_client(&umad_client);
1211 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1218 class_destroy(umad_class);
1221 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1227 static void __exit ib_umad_cleanup(void)
1229 ib_unregister_client(&umad_client);
1230 class_destroy(umad_class);
1231 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1233 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1236 module_init(ib_umad_init);
1237 module_exit(ib_umad_cleanup);