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
35 * $Id: user_mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/device.h>
41 #include <linux/err.h>
43 #include <linux/cdev.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
47 #include <linux/kref.h>
48 #include <linux/compat.h>
49 #include <linux/semaphore.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: each time a
70 * device special file is opened, we look up the corresponding struct
71 * ib_umad_port by minor in the umad_port[] table while holding the
72 * port_lock. If this lookup succeeds, we take a reference on the
73 * ib_umad_port's struct ib_umad_device while still holding the
74 * port_lock; if the lookup fails, we fail the open(). We drop these
75 * references in the corresponding close().
77 * In addition to references coming from open character devices, there
78 * is one more reference to each ib_umad_device representing the
79 * module's reference taken when allocating the ib_umad_device in
82 * When destroying an ib_umad_device, we clear all of its
83 * ib_umad_ports from umad_port[] while holding port_lock before
84 * dropping the module's reference to the ib_umad_device. This is
85 * always safe because any open() calls will either succeed and obtain
86 * a reference before we clear the umad_port[] entries, or fail after
87 * we clear the umad_port[] entries.
95 struct device *sm_dev;
96 struct semaphore sm_sem;
98 struct mutex file_mutex;
99 struct list_head file_list;
101 struct ib_device *ib_dev;
102 struct ib_umad_device *umad_dev;
107 struct ib_umad_device {
108 int start_port, end_port;
110 struct ib_umad_port port[0];
113 struct ib_umad_file {
115 struct ib_umad_port *port;
116 struct list_head recv_list;
117 struct list_head send_list;
118 struct list_head port_list;
119 spinlock_t send_lock;
120 wait_queue_head_t recv_wait;
121 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
127 struct ib_umad_packet {
128 struct ib_mad_send_buf *msg;
129 struct ib_mad_recv_wc *recv_wc;
130 struct list_head list;
132 struct ib_user_mad mad;
135 static struct class *umad_class;
137 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
139 static DEFINE_SPINLOCK(port_lock);
140 static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
141 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
143 static void ib_umad_add_one(struct ib_device *device);
144 static void ib_umad_remove_one(struct ib_device *device);
146 static void ib_umad_release_dev(struct kref *ref)
148 struct ib_umad_device *dev =
149 container_of(ref, struct ib_umad_device, ref);
154 static int hdr_size(struct ib_umad_file *file)
156 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
157 sizeof (struct ib_user_mad_hdr_old);
160 /* caller must hold file->mutex */
161 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
163 return file->agents_dead ? NULL : file->agent[id];
166 static int queue_packet(struct ib_umad_file *file,
167 struct ib_mad_agent *agent,
168 struct ib_umad_packet *packet)
172 mutex_lock(&file->mutex);
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);
184 mutex_unlock(&file->mutex);
189 static void dequeue_send(struct ib_umad_file *file,
190 struct ib_umad_packet *packet)
192 spin_lock_irq(&file->send_lock);
193 list_del(&packet->list);
194 spin_unlock_irq(&file->send_lock);
197 static void send_handler(struct ib_mad_agent *agent,
198 struct ib_mad_send_wc *send_wc)
200 struct ib_umad_file *file = agent->context;
201 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
203 dequeue_send(file, packet);
204 ib_destroy_ah(packet->msg->ah);
205 ib_free_send_mad(packet->msg);
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))
216 static void recv_handler(struct ib_mad_agent *agent,
217 struct ib_mad_recv_wc *mad_recv_wc)
219 struct ib_umad_file *file = agent->context;
220 struct ib_umad_packet *packet;
222 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
225 packet = kzalloc(sizeof *packet, GFP_KERNEL);
229 packet->length = mad_recv_wc->mad_len;
230 packet->recv_wc = mad_recv_wc;
232 packet->mad.hdr.status = 0;
233 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
234 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
235 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
236 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
237 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
238 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
239 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
240 if (packet->mad.hdr.grh_present) {
241 struct ib_ah_attr ah_attr;
243 ib_init_ah_from_wc(agent->device, agent->port_num,
244 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
247 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
248 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
249 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
250 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
251 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
254 if (queue_packet(file, agent, packet))
261 ib_free_recv_mad(mad_recv_wc);
264 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
265 struct ib_umad_packet *packet, size_t count)
267 struct ib_mad_recv_buf *recv_buf;
268 int left, seg_payload, offset, max_seg_payload;
270 /* We need enough room to copy the first (or only) MAD segment. */
271 recv_buf = &packet->recv_wc->recv_buf;
272 if ((packet->length <= sizeof (*recv_buf->mad) &&
273 count < hdr_size(file) + packet->length) ||
274 (packet->length > sizeof (*recv_buf->mad) &&
275 count < hdr_size(file) + sizeof (*recv_buf->mad)))
278 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
281 buf += hdr_size(file);
282 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
283 if (copy_to_user(buf, recv_buf->mad, seg_payload))
286 if (seg_payload < packet->length) {
288 * Multipacket RMPP MAD message. Copy remainder of message.
289 * Note that last segment may have a shorter payload.
291 if (count < hdr_size(file) + packet->length) {
293 * The buffer is too small, return the first RMPP segment,
294 * which includes the RMPP message length.
298 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
299 max_seg_payload = sizeof (struct ib_mad) - offset;
301 for (left = packet->length - seg_payload, buf += seg_payload;
302 left; left -= seg_payload, buf += seg_payload) {
303 recv_buf = container_of(recv_buf->list.next,
304 struct ib_mad_recv_buf, list);
305 seg_payload = min(left, max_seg_payload);
306 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
311 return hdr_size(file) + packet->length;
314 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
315 struct ib_umad_packet *packet, size_t count)
317 ssize_t size = hdr_size(file) + packet->length;
322 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
325 buf += hdr_size(file);
327 if (copy_to_user(buf, packet->mad.data, packet->length))
333 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
334 size_t count, loff_t *pos)
336 struct ib_umad_file *file = filp->private_data;
337 struct ib_umad_packet *packet;
340 if (count < hdr_size(file))
343 mutex_lock(&file->mutex);
345 while (list_empty(&file->recv_list)) {
346 mutex_unlock(&file->mutex);
348 if (filp->f_flags & O_NONBLOCK)
351 if (wait_event_interruptible(file->recv_wait,
352 !list_empty(&file->recv_list)))
355 mutex_lock(&file->mutex);
358 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
359 list_del(&packet->list);
361 mutex_unlock(&file->mutex);
364 ret = copy_recv_mad(file, buf, packet, count);
366 ret = copy_send_mad(file, buf, packet, count);
370 mutex_lock(&file->mutex);
371 list_add(&packet->list, &file->recv_list);
372 mutex_unlock(&file->mutex);
375 ib_free_recv_mad(packet->recv_wc);
381 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
385 /* Copy class specific header */
386 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
387 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
388 msg->hdr_len - IB_MGMT_RMPP_HDR))
391 /* All headers are in place. Copy data segments. */
392 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
393 seg++, left -= msg->seg_size, buf += msg->seg_size) {
394 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
395 min(left, msg->seg_size)))
401 static int same_destination(struct ib_user_mad_hdr *hdr1,
402 struct ib_user_mad_hdr *hdr2)
404 if (!hdr1->grh_present && !hdr2->grh_present)
405 return (hdr1->lid == hdr2->lid);
407 if (hdr1->grh_present && hdr2->grh_present)
408 return !memcmp(hdr1->gid, hdr2->gid, 16);
413 static int is_duplicate(struct ib_umad_file *file,
414 struct ib_umad_packet *packet)
416 struct ib_umad_packet *sent_packet;
417 struct ib_mad_hdr *sent_hdr, *hdr;
419 hdr = (struct ib_mad_hdr *) packet->mad.data;
420 list_for_each_entry(sent_packet, &file->send_list, list) {
421 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
423 if ((hdr->tid != sent_hdr->tid) ||
424 (hdr->mgmt_class != sent_hdr->mgmt_class))
428 * No need to be overly clever here. If two new operations have
429 * the same TID, reject the second as a duplicate. This is more
430 * restrictive than required by the spec.
432 if (!ib_response_mad((struct ib_mad *) hdr)) {
433 if (!ib_response_mad((struct ib_mad *) sent_hdr))
436 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
439 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
446 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
447 size_t count, loff_t *pos)
449 struct ib_umad_file *file = filp->private_data;
450 struct ib_umad_packet *packet;
451 struct ib_mad_agent *agent;
452 struct ib_ah_attr ah_attr;
454 struct ib_rmpp_mad *rmpp_mad;
456 int ret, data_len, hdr_len, copy_offset, rmpp_active;
458 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
461 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
465 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
470 if (packet->mad.hdr.id < 0 ||
471 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
476 buf += hdr_size(file);
478 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
483 mutex_lock(&file->mutex);
485 agent = __get_agent(file, packet->mad.hdr.id);
491 memset(&ah_attr, 0, sizeof ah_attr);
492 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
493 ah_attr.sl = packet->mad.hdr.sl;
494 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
495 ah_attr.port_num = file->port->port_num;
496 if (packet->mad.hdr.grh_present) {
497 ah_attr.ah_flags = IB_AH_GRH;
498 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
499 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
500 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
501 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
502 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
505 ah = ib_create_ah(agent->qp->pd, &ah_attr);
511 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
512 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
513 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
514 copy_offset = IB_MGMT_MAD_HDR;
517 copy_offset = IB_MGMT_RMPP_HDR;
518 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
519 IB_MGMT_RMPP_FLAG_ACTIVE;
522 data_len = count - hdr_size(file) - hdr_len;
523 packet->msg = ib_create_send_mad(agent,
524 be32_to_cpu(packet->mad.hdr.qpn),
525 packet->mad.hdr.pkey_index, rmpp_active,
526 hdr_len, data_len, GFP_KERNEL);
527 if (IS_ERR(packet->msg)) {
528 ret = PTR_ERR(packet->msg);
532 packet->msg->ah = ah;
533 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
534 packet->msg->retries = packet->mad.hdr.retries;
535 packet->msg->context[0] = packet;
537 /* Copy MAD header. Any RMPP header is already in place. */
538 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
541 if (copy_from_user(packet->msg->mad + copy_offset,
543 hdr_len + data_len - copy_offset)) {
548 ret = copy_rmpp_mad(packet->msg, buf);
554 * Set the high-order part of the transaction ID to make MADs from
555 * different agents unique, and allow routing responses back to the
556 * original requestor.
558 if (!ib_response_mad(packet->msg->mad)) {
559 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
560 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
561 (be64_to_cpup(tid) & 0xffffffff));
562 rmpp_mad->mad_hdr.tid = *tid;
565 spin_lock_irq(&file->send_lock);
566 ret = is_duplicate(file, packet);
568 list_add_tail(&packet->list, &file->send_list);
569 spin_unlock_irq(&file->send_lock);
575 ret = ib_post_send_mad(packet->msg, NULL);
579 mutex_unlock(&file->mutex);
583 dequeue_send(file, packet);
585 ib_free_send_mad(packet->msg);
589 mutex_unlock(&file->mutex);
595 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
597 struct ib_umad_file *file = filp->private_data;
599 /* we will always be able to post a MAD send */
600 unsigned int mask = POLLOUT | POLLWRNORM;
602 poll_wait(filp, &file->recv_wait, wait);
604 if (!list_empty(&file->recv_list))
605 mask |= POLLIN | POLLRDNORM;
610 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
611 int compat_method_mask)
613 struct ib_user_mad_reg_req ureq;
614 struct ib_mad_reg_req req;
615 struct ib_mad_agent *agent = NULL;
619 mutex_lock(&file->port->file_mutex);
620 mutex_lock(&file->mutex);
622 if (!file->port->ib_dev) {
627 if (copy_from_user(&ureq, arg, sizeof ureq)) {
632 if (ureq.qpn != 0 && ureq.qpn != 1) {
637 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
638 if (!__get_agent(file, agent_id))
645 if (ureq.mgmt_class) {
646 req.mgmt_class = ureq.mgmt_class;
647 req.mgmt_class_version = ureq.mgmt_class_version;
648 memcpy(req.oui, ureq.oui, sizeof req.oui);
650 if (compat_method_mask) {
651 u32 *umm = (u32 *) ureq.method_mask;
654 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
656 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
658 memcpy(req.method_mask, ureq.method_mask,
659 sizeof req.method_mask);
662 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
663 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
664 ureq.mgmt_class ? &req : NULL,
666 send_handler, recv_handler, file);
668 ret = PTR_ERR(agent);
673 if (put_user(agent_id,
674 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
679 if (!file->already_used) {
680 file->already_used = 1;
681 if (!file->use_pkey_index) {
682 printk(KERN_WARNING "user_mad: process %s did not enable "
683 "P_Key index support.\n", current->comm);
684 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
685 "has info on the new ABI.\n");
689 file->agent[agent_id] = agent;
693 mutex_unlock(&file->mutex);
696 ib_unregister_mad_agent(agent);
698 mutex_unlock(&file->port->file_mutex);
703 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
705 struct ib_mad_agent *agent = NULL;
709 if (get_user(id, arg))
712 mutex_lock(&file->port->file_mutex);
713 mutex_lock(&file->mutex);
715 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
720 agent = file->agent[id];
721 file->agent[id] = NULL;
724 mutex_unlock(&file->mutex);
727 ib_unregister_mad_agent(agent);
729 mutex_unlock(&file->port->file_mutex);
734 static long ib_umad_enable_pkey(struct ib_umad_file *file)
738 mutex_lock(&file->mutex);
739 if (file->already_used)
742 file->use_pkey_index = 1;
743 mutex_unlock(&file->mutex);
748 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
752 case IB_USER_MAD_REGISTER_AGENT:
753 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
754 case IB_USER_MAD_UNREGISTER_AGENT:
755 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
756 case IB_USER_MAD_ENABLE_PKEY:
757 return ib_umad_enable_pkey(filp->private_data);
764 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
768 case IB_USER_MAD_REGISTER_AGENT:
769 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
770 case IB_USER_MAD_UNREGISTER_AGENT:
771 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
772 case IB_USER_MAD_ENABLE_PKEY:
773 return ib_umad_enable_pkey(filp->private_data);
780 static int ib_umad_open(struct inode *inode, struct file *filp)
782 struct ib_umad_port *port;
783 struct ib_umad_file *file;
786 spin_lock(&port_lock);
787 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
789 kref_get(&port->umad_dev->ref);
790 spin_unlock(&port_lock);
795 mutex_lock(&port->file_mutex);
802 file = kzalloc(sizeof *file, GFP_KERNEL);
804 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
809 mutex_init(&file->mutex);
810 spin_lock_init(&file->send_lock);
811 INIT_LIST_HEAD(&file->recv_list);
812 INIT_LIST_HEAD(&file->send_list);
813 init_waitqueue_head(&file->recv_wait);
816 filp->private_data = file;
818 list_add_tail(&file->port_list, &port->file_list);
821 mutex_unlock(&port->file_mutex);
825 static int ib_umad_close(struct inode *inode, struct file *filp)
827 struct ib_umad_file *file = filp->private_data;
828 struct ib_umad_device *dev = file->port->umad_dev;
829 struct ib_umad_packet *packet, *tmp;
833 mutex_lock(&file->port->file_mutex);
834 mutex_lock(&file->mutex);
836 already_dead = file->agents_dead;
837 file->agents_dead = 1;
839 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
841 ib_free_recv_mad(packet->recv_wc);
845 list_del(&file->port_list);
847 mutex_unlock(&file->mutex);
850 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
852 ib_unregister_mad_agent(file->agent[i]);
854 mutex_unlock(&file->port->file_mutex);
857 kref_put(&dev->ref, ib_umad_release_dev);
862 static const struct file_operations umad_fops = {
863 .owner = THIS_MODULE,
864 .read = ib_umad_read,
865 .write = ib_umad_write,
866 .poll = ib_umad_poll,
867 .unlocked_ioctl = ib_umad_ioctl,
869 .compat_ioctl = ib_umad_compat_ioctl,
871 .open = ib_umad_open,
872 .release = ib_umad_close
875 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
877 struct ib_umad_port *port;
878 struct ib_port_modify props = {
879 .set_port_cap_mask = IB_PORT_SM
883 spin_lock(&port_lock);
884 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
886 kref_get(&port->umad_dev->ref);
887 spin_unlock(&port_lock);
892 if (filp->f_flags & O_NONBLOCK) {
893 if (down_trylock(&port->sm_sem)) {
898 if (down_interruptible(&port->sm_sem)) {
904 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
910 filp->private_data = port;
915 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
919 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
921 struct ib_umad_port *port = filp->private_data;
922 struct ib_port_modify props = {
923 .clr_port_cap_mask = IB_PORT_SM
927 mutex_lock(&port->file_mutex);
929 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
930 mutex_unlock(&port->file_mutex);
934 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
939 static const struct file_operations umad_sm_fops = {
940 .owner = THIS_MODULE,
941 .open = ib_umad_sm_open,
942 .release = ib_umad_sm_close
945 static struct ib_client umad_client = {
947 .add = ib_umad_add_one,
948 .remove = ib_umad_remove_one
951 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
954 struct ib_umad_port *port = dev_get_drvdata(dev);
959 return sprintf(buf, "%s\n", port->ib_dev->name);
961 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
963 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
966 struct ib_umad_port *port = dev_get_drvdata(dev);
971 return sprintf(buf, "%d\n", port->port_num);
973 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
975 static ssize_t show_abi_version(struct class *class, char *buf)
977 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
979 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
981 static int ib_umad_init_port(struct ib_device *device, int port_num,
982 struct ib_umad_port *port)
984 spin_lock(&port_lock);
985 port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
986 if (port->dev_num >= IB_UMAD_MAX_PORTS) {
987 spin_unlock(&port_lock);
990 set_bit(port->dev_num, dev_map);
991 spin_unlock(&port_lock);
993 port->ib_dev = device;
994 port->port_num = port_num;
995 init_MUTEX(&port->sm_sem);
996 mutex_init(&port->file_mutex);
997 INIT_LIST_HEAD(&port->file_list);
999 port->cdev = cdev_alloc();
1002 port->cdev->owner = THIS_MODULE;
1003 port->cdev->ops = &umad_fops;
1004 kobject_set_name(&port->cdev->kobj, "umad%d", port->dev_num);
1005 if (cdev_add(port->cdev, base_dev + port->dev_num, 1))
1008 port->dev = device_create_drvdata(umad_class, device->dma_device,
1009 port->cdev->dev, port,
1010 "umad%d", port->dev_num);
1011 if (IS_ERR(port->dev))
1014 if (device_create_file(port->dev, &dev_attr_ibdev))
1016 if (device_create_file(port->dev, &dev_attr_port))
1019 port->sm_cdev = cdev_alloc();
1022 port->sm_cdev->owner = THIS_MODULE;
1023 port->sm_cdev->ops = &umad_sm_fops;
1024 kobject_set_name(&port->sm_cdev->kobj, "issm%d", port->dev_num);
1025 if (cdev_add(port->sm_cdev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
1028 port->sm_dev = device_create_drvdata(umad_class, device->dma_device,
1029 port->sm_cdev->dev, port,
1030 "issm%d", port->dev_num);
1031 if (IS_ERR(port->sm_dev))
1034 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1036 if (device_create_file(port->sm_dev, &dev_attr_port))
1039 spin_lock(&port_lock);
1040 umad_port[port->dev_num] = port;
1041 spin_unlock(&port_lock);
1046 device_destroy(umad_class, port->sm_cdev->dev);
1049 cdev_del(port->sm_cdev);
1052 device_destroy(umad_class, port->cdev->dev);
1055 cdev_del(port->cdev);
1056 clear_bit(port->dev_num, dev_map);
1061 static void ib_umad_kill_port(struct ib_umad_port *port)
1063 struct ib_umad_file *file;
1067 dev_set_drvdata(port->dev, NULL);
1068 dev_set_drvdata(port->sm_dev, NULL);
1070 device_destroy(umad_class, port->cdev->dev);
1071 device_destroy(umad_class, port->sm_cdev->dev);
1073 cdev_del(port->cdev);
1074 cdev_del(port->sm_cdev);
1076 spin_lock(&port_lock);
1077 umad_port[port->dev_num] = NULL;
1078 spin_unlock(&port_lock);
1080 mutex_lock(&port->file_mutex);
1082 port->ib_dev = NULL;
1084 list_for_each_entry(file, &port->file_list, port_list) {
1085 mutex_lock(&file->mutex);
1086 already_dead = file->agents_dead;
1087 file->agents_dead = 1;
1088 mutex_unlock(&file->mutex);
1090 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1091 if (file->agent[id])
1092 ib_unregister_mad_agent(file->agent[id]);
1095 mutex_unlock(&port->file_mutex);
1097 clear_bit(port->dev_num, dev_map);
1100 static void ib_umad_add_one(struct ib_device *device)
1102 struct ib_umad_device *umad_dev;
1105 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1108 if (device->node_type == RDMA_NODE_IB_SWITCH)
1112 e = device->phys_port_cnt;
1115 umad_dev = kzalloc(sizeof *umad_dev +
1116 (e - s + 1) * sizeof (struct ib_umad_port),
1121 kref_init(&umad_dev->ref);
1123 umad_dev->start_port = s;
1124 umad_dev->end_port = e;
1126 for (i = s; i <= e; ++i) {
1127 umad_dev->port[i - s].umad_dev = umad_dev;
1129 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1133 ib_set_client_data(device, &umad_client, umad_dev);
1139 ib_umad_kill_port(&umad_dev->port[i - s]);
1141 kref_put(&umad_dev->ref, ib_umad_release_dev);
1144 static void ib_umad_remove_one(struct ib_device *device)
1146 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1152 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1153 ib_umad_kill_port(&umad_dev->port[i]);
1155 kref_put(&umad_dev->ref, ib_umad_release_dev);
1158 static int __init ib_umad_init(void)
1162 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1165 printk(KERN_ERR "user_mad: couldn't register device number\n");
1169 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1170 if (IS_ERR(umad_class)) {
1171 ret = PTR_ERR(umad_class);
1172 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1176 ret = class_create_file(umad_class, &class_attr_abi_version);
1178 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1182 ret = ib_register_client(&umad_client);
1184 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1191 class_destroy(umad_class);
1194 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1200 static void __exit ib_umad_cleanup(void)
1202 ib_unregister_client(&umad_client);
1203 class_destroy(umad_class);
1204 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1207 module_init(ib_umad_init);
1208 module_exit(ib_umad_cleanup);