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 #define pr_fmt(fmt) "user_mad: " fmt
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/sched.h>
50 #include <linux/semaphore.h>
51 #include <linux/slab.h>
53 #include <asm/uaccess.h>
55 #include <rdma/ib_mad.h>
56 #include <rdma/ib_user_mad.h>
58 MODULE_AUTHOR("Roland Dreier");
59 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
60 MODULE_LICENSE("Dual BSD/GPL");
63 IB_UMAD_MAX_PORTS = 64,
64 IB_UMAD_MAX_AGENTS = 32,
67 IB_UMAD_MINOR_BASE = 0
71 * Our lifetime rules for these structs are the following:
72 * device special file is opened, we take a reference on the
73 * ib_umad_port's struct ib_umad_device. We drop these
74 * references in the corresponding close().
76 * In addition to references coming from open character devices, there
77 * is one more reference to each ib_umad_device representing the
78 * module's reference taken when allocating the ib_umad_device in
81 * When destroying an ib_umad_device, we drop the module's reference.
89 struct device *sm_dev;
90 struct semaphore sm_sem;
92 struct mutex file_mutex;
93 struct list_head file_list;
95 struct ib_device *ib_dev;
96 struct ib_umad_device *umad_dev;
101 struct ib_umad_device {
103 struct ib_umad_port port[0];
106 struct ib_umad_file {
108 struct ib_umad_port *port;
109 struct list_head recv_list;
110 struct list_head send_list;
111 struct list_head port_list;
112 spinlock_t send_lock;
113 wait_queue_head_t recv_wait;
114 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
120 struct ib_umad_packet {
121 struct ib_mad_send_buf *msg;
122 struct ib_mad_recv_wc *recv_wc;
123 struct list_head list;
125 struct ib_user_mad mad;
128 static struct class *umad_class;
130 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
132 static DEFINE_SPINLOCK(port_lock);
133 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
135 static void ib_umad_add_one(struct ib_device *device);
136 static void ib_umad_remove_one(struct ib_device *device);
138 static void ib_umad_release_dev(struct kobject *kobj)
140 struct ib_umad_device *dev =
141 container_of(kobj, struct ib_umad_device, kobj);
146 static struct kobj_type ib_umad_dev_ktype = {
147 .release = ib_umad_release_dev,
150 static int hdr_size(struct ib_umad_file *file)
152 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
153 sizeof (struct ib_user_mad_hdr_old);
156 /* caller must hold file->mutex */
157 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
159 return file->agents_dead ? NULL : file->agent[id];
162 static int queue_packet(struct ib_umad_file *file,
163 struct ib_mad_agent *agent,
164 struct ib_umad_packet *packet)
168 mutex_lock(&file->mutex);
170 for (packet->mad.hdr.id = 0;
171 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
172 packet->mad.hdr.id++)
173 if (agent == __get_agent(file, packet->mad.hdr.id)) {
174 list_add_tail(&packet->list, &file->recv_list);
175 wake_up_interruptible(&file->recv_wait);
180 mutex_unlock(&file->mutex);
185 static void dequeue_send(struct ib_umad_file *file,
186 struct ib_umad_packet *packet)
188 spin_lock_irq(&file->send_lock);
189 list_del(&packet->list);
190 spin_unlock_irq(&file->send_lock);
193 static void send_handler(struct ib_mad_agent *agent,
194 struct ib_mad_send_wc *send_wc)
196 struct ib_umad_file *file = agent->context;
197 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
199 dequeue_send(file, packet);
200 ib_destroy_ah(packet->msg->ah);
201 ib_free_send_mad(packet->msg);
203 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
204 packet->length = IB_MGMT_MAD_HDR;
205 packet->mad.hdr.status = ETIMEDOUT;
206 if (!queue_packet(file, agent, packet))
212 static void recv_handler(struct ib_mad_agent *agent,
213 struct ib_mad_recv_wc *mad_recv_wc)
215 struct ib_umad_file *file = agent->context;
216 struct ib_umad_packet *packet;
218 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
221 packet = kzalloc(sizeof *packet, GFP_KERNEL);
225 packet->length = mad_recv_wc->mad_len;
226 packet->recv_wc = mad_recv_wc;
228 packet->mad.hdr.status = 0;
229 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
230 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
231 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
232 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
233 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
234 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
235 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
236 if (packet->mad.hdr.grh_present) {
237 struct ib_ah_attr ah_attr;
239 ib_init_ah_from_wc(agent->device, agent->port_num,
240 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
243 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
244 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
245 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
246 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
247 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
250 if (queue_packet(file, agent, packet))
257 ib_free_recv_mad(mad_recv_wc);
260 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
261 struct ib_umad_packet *packet, size_t count)
263 struct ib_mad_recv_buf *recv_buf;
264 int left, seg_payload, offset, max_seg_payload;
266 /* We need enough room to copy the first (or only) MAD segment. */
267 recv_buf = &packet->recv_wc->recv_buf;
268 if ((packet->length <= sizeof (*recv_buf->mad) &&
269 count < hdr_size(file) + packet->length) ||
270 (packet->length > sizeof (*recv_buf->mad) &&
271 count < hdr_size(file) + sizeof (*recv_buf->mad)))
274 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
277 buf += hdr_size(file);
278 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
279 if (copy_to_user(buf, recv_buf->mad, seg_payload))
282 if (seg_payload < packet->length) {
284 * Multipacket RMPP MAD message. Copy remainder of message.
285 * Note that last segment may have a shorter payload.
287 if (count < hdr_size(file) + packet->length) {
289 * The buffer is too small, return the first RMPP segment,
290 * which includes the RMPP message length.
294 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
295 max_seg_payload = sizeof (struct ib_mad) - offset;
297 for (left = packet->length - seg_payload, buf += seg_payload;
298 left; left -= seg_payload, buf += seg_payload) {
299 recv_buf = container_of(recv_buf->list.next,
300 struct ib_mad_recv_buf, list);
301 seg_payload = min(left, max_seg_payload);
302 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
307 return hdr_size(file) + packet->length;
310 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
311 struct ib_umad_packet *packet, size_t count)
313 ssize_t size = hdr_size(file) + packet->length;
318 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
321 buf += hdr_size(file);
323 if (copy_to_user(buf, packet->mad.data, packet->length))
329 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
330 size_t count, loff_t *pos)
332 struct ib_umad_file *file = filp->private_data;
333 struct ib_umad_packet *packet;
336 if (count < hdr_size(file))
339 mutex_lock(&file->mutex);
341 while (list_empty(&file->recv_list)) {
342 mutex_unlock(&file->mutex);
344 if (filp->f_flags & O_NONBLOCK)
347 if (wait_event_interruptible(file->recv_wait,
348 !list_empty(&file->recv_list)))
351 mutex_lock(&file->mutex);
354 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
355 list_del(&packet->list);
357 mutex_unlock(&file->mutex);
360 ret = copy_recv_mad(file, buf, packet, count);
362 ret = copy_send_mad(file, buf, packet, count);
366 mutex_lock(&file->mutex);
367 list_add(&packet->list, &file->recv_list);
368 mutex_unlock(&file->mutex);
371 ib_free_recv_mad(packet->recv_wc);
377 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
381 /* Copy class specific header */
382 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
383 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
384 msg->hdr_len - IB_MGMT_RMPP_HDR))
387 /* All headers are in place. Copy data segments. */
388 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
389 seg++, left -= msg->seg_size, buf += msg->seg_size) {
390 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
391 min(left, msg->seg_size)))
397 static int same_destination(struct ib_user_mad_hdr *hdr1,
398 struct ib_user_mad_hdr *hdr2)
400 if (!hdr1->grh_present && !hdr2->grh_present)
401 return (hdr1->lid == hdr2->lid);
403 if (hdr1->grh_present && hdr2->grh_present)
404 return !memcmp(hdr1->gid, hdr2->gid, 16);
409 static int is_duplicate(struct ib_umad_file *file,
410 struct ib_umad_packet *packet)
412 struct ib_umad_packet *sent_packet;
413 struct ib_mad_hdr *sent_hdr, *hdr;
415 hdr = (struct ib_mad_hdr *) packet->mad.data;
416 list_for_each_entry(sent_packet, &file->send_list, list) {
417 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
419 if ((hdr->tid != sent_hdr->tid) ||
420 (hdr->mgmt_class != sent_hdr->mgmt_class))
424 * No need to be overly clever here. If two new operations have
425 * the same TID, reject the second as a duplicate. This is more
426 * restrictive than required by the spec.
428 if (!ib_response_mad(hdr)) {
429 if (!ib_response_mad(sent_hdr))
432 } else if (!ib_response_mad(sent_hdr))
435 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
442 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
443 size_t count, loff_t *pos)
445 struct ib_umad_file *file = filp->private_data;
446 struct ib_umad_packet *packet;
447 struct ib_mad_agent *agent;
448 struct ib_ah_attr ah_attr;
450 struct ib_rmpp_mad *rmpp_mad;
452 int ret, data_len, hdr_len, copy_offset, rmpp_active;
454 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
457 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
461 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
466 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
471 buf += hdr_size(file);
473 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
478 mutex_lock(&file->mutex);
480 agent = __get_agent(file, packet->mad.hdr.id);
486 memset(&ah_attr, 0, sizeof ah_attr);
487 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
488 ah_attr.sl = packet->mad.hdr.sl;
489 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
490 ah_attr.port_num = file->port->port_num;
491 if (packet->mad.hdr.grh_present) {
492 ah_attr.ah_flags = IB_AH_GRH;
493 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
494 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
495 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
496 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
497 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
500 ah = ib_create_ah(agent->qp->pd, &ah_attr);
506 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
507 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
509 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
510 && ib_mad_kernel_rmpp_agent(agent)) {
511 copy_offset = IB_MGMT_RMPP_HDR;
512 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
513 IB_MGMT_RMPP_FLAG_ACTIVE;
515 copy_offset = IB_MGMT_MAD_HDR;
519 data_len = count - hdr_size(file) - hdr_len;
520 packet->msg = ib_create_send_mad(agent,
521 be32_to_cpu(packet->mad.hdr.qpn),
522 packet->mad.hdr.pkey_index, rmpp_active,
523 hdr_len, data_len, GFP_KERNEL,
524 IB_MGMT_BASE_VERSION);
525 if (IS_ERR(packet->msg)) {
526 ret = PTR_ERR(packet->msg);
530 packet->msg->ah = ah;
531 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
532 packet->msg->retries = packet->mad.hdr.retries;
533 packet->msg->context[0] = packet;
535 /* Copy MAD header. Any RMPP header is already in place. */
536 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
539 if (copy_from_user(packet->msg->mad + copy_offset,
541 hdr_len + data_len - copy_offset)) {
546 ret = copy_rmpp_mad(packet->msg, buf);
552 * Set the high-order part of the transaction ID to make MADs from
553 * different agents unique, and allow routing responses back to the
554 * original requestor.
556 if (!ib_response_mad(packet->msg->mad)) {
557 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
558 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
559 (be64_to_cpup(tid) & 0xffffffff));
560 rmpp_mad->mad_hdr.tid = *tid;
563 if (!ib_mad_kernel_rmpp_agent(agent)
564 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
565 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
566 spin_lock_irq(&file->send_lock);
567 list_add_tail(&packet->list, &file->send_list);
568 spin_unlock_irq(&file->send_lock);
570 spin_lock_irq(&file->send_lock);
571 ret = is_duplicate(file, packet);
573 list_add_tail(&packet->list, &file->send_list);
574 spin_unlock_irq(&file->send_lock);
581 ret = ib_post_send_mad(packet->msg, NULL);
585 mutex_unlock(&file->mutex);
589 dequeue_send(file, packet);
591 ib_free_send_mad(packet->msg);
595 mutex_unlock(&file->mutex);
601 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
603 struct ib_umad_file *file = filp->private_data;
605 /* we will always be able to post a MAD send */
606 unsigned int mask = POLLOUT | POLLWRNORM;
608 poll_wait(filp, &file->recv_wait, wait);
610 if (!list_empty(&file->recv_list))
611 mask |= POLLIN | POLLRDNORM;
616 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
617 int compat_method_mask)
619 struct ib_user_mad_reg_req ureq;
620 struct ib_mad_reg_req req;
621 struct ib_mad_agent *agent = NULL;
625 mutex_lock(&file->port->file_mutex);
626 mutex_lock(&file->mutex);
628 if (!file->port->ib_dev) {
629 dev_notice(file->port->dev,
630 "ib_umad_reg_agent: invalid device\n");
635 if (copy_from_user(&ureq, arg, sizeof ureq)) {
640 if (ureq.qpn != 0 && ureq.qpn != 1) {
641 dev_notice(file->port->dev,
642 "ib_umad_reg_agent: invalid QPN %d specified\n",
648 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
649 if (!__get_agent(file, agent_id))
652 dev_notice(file->port->dev,
653 "ib_umad_reg_agent: Max Agents (%u) reached\n",
659 if (ureq.mgmt_class) {
660 memset(&req, 0, sizeof(req));
661 req.mgmt_class = ureq.mgmt_class;
662 req.mgmt_class_version = ureq.mgmt_class_version;
663 memcpy(req.oui, ureq.oui, sizeof req.oui);
665 if (compat_method_mask) {
666 u32 *umm = (u32 *) ureq.method_mask;
669 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
671 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
673 memcpy(req.method_mask, ureq.method_mask,
674 sizeof req.method_mask);
677 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
678 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
679 ureq.mgmt_class ? &req : NULL,
681 send_handler, recv_handler, file, 0);
683 ret = PTR_ERR(agent);
688 if (put_user(agent_id,
689 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
694 if (!file->already_used) {
695 file->already_used = 1;
696 if (!file->use_pkey_index) {
697 dev_warn(file->port->dev,
698 "process %s did not enable P_Key index support.\n",
700 dev_warn(file->port->dev,
701 " Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
705 file->agent[agent_id] = agent;
709 mutex_unlock(&file->mutex);
712 ib_unregister_mad_agent(agent);
714 mutex_unlock(&file->port->file_mutex);
719 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
721 struct ib_user_mad_reg_req2 ureq;
722 struct ib_mad_reg_req req;
723 struct ib_mad_agent *agent = NULL;
727 mutex_lock(&file->port->file_mutex);
728 mutex_lock(&file->mutex);
730 if (!file->port->ib_dev) {
731 dev_notice(file->port->dev,
732 "ib_umad_reg_agent2: invalid device\n");
737 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
742 if (ureq.qpn != 0 && ureq.qpn != 1) {
743 dev_notice(file->port->dev,
744 "ib_umad_reg_agent2: invalid QPN %d specified\n",
750 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
751 dev_notice(file->port->dev,
752 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
753 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
756 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
757 (u32 __user *) (arg + offsetof(struct
758 ib_user_mad_reg_req2, flags))))
764 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
765 if (!__get_agent(file, agent_id))
768 dev_notice(file->port->dev,
769 "ib_umad_reg_agent2: Max Agents (%u) reached\n",
775 if (ureq.mgmt_class) {
776 memset(&req, 0, sizeof(req));
777 req.mgmt_class = ureq.mgmt_class;
778 req.mgmt_class_version = ureq.mgmt_class_version;
779 if (ureq.oui & 0xff000000) {
780 dev_notice(file->port->dev,
781 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
786 req.oui[2] = ureq.oui & 0x0000ff;
787 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
788 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
789 memcpy(req.method_mask, ureq.method_mask,
790 sizeof(req.method_mask));
793 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
794 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
795 ureq.mgmt_class ? &req : NULL,
797 send_handler, recv_handler, file,
800 ret = PTR_ERR(agent);
805 if (put_user(agent_id,
807 offsetof(struct ib_user_mad_reg_req2, id)))) {
812 if (!file->already_used) {
813 file->already_used = 1;
814 file->use_pkey_index = 1;
817 file->agent[agent_id] = agent;
821 mutex_unlock(&file->mutex);
824 ib_unregister_mad_agent(agent);
826 mutex_unlock(&file->port->file_mutex);
832 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
834 struct ib_mad_agent *agent = NULL;
838 if (get_user(id, arg))
841 mutex_lock(&file->port->file_mutex);
842 mutex_lock(&file->mutex);
844 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
849 agent = file->agent[id];
850 file->agent[id] = NULL;
853 mutex_unlock(&file->mutex);
856 ib_unregister_mad_agent(agent);
858 mutex_unlock(&file->port->file_mutex);
863 static long ib_umad_enable_pkey(struct ib_umad_file *file)
867 mutex_lock(&file->mutex);
868 if (file->already_used)
871 file->use_pkey_index = 1;
872 mutex_unlock(&file->mutex);
877 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
881 case IB_USER_MAD_REGISTER_AGENT:
882 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
883 case IB_USER_MAD_UNREGISTER_AGENT:
884 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
885 case IB_USER_MAD_ENABLE_PKEY:
886 return ib_umad_enable_pkey(filp->private_data);
887 case IB_USER_MAD_REGISTER_AGENT2:
888 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
895 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
899 case IB_USER_MAD_REGISTER_AGENT:
900 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
901 case IB_USER_MAD_UNREGISTER_AGENT:
902 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
903 case IB_USER_MAD_ENABLE_PKEY:
904 return ib_umad_enable_pkey(filp->private_data);
905 case IB_USER_MAD_REGISTER_AGENT2:
906 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
914 * ib_umad_open() does not need the BKL:
916 * - the ib_umad_port structures are properly reference counted, and
917 * everything else is purely local to the file being created, so
918 * races against other open calls are not a problem;
919 * - the ioctl method does not affect any global state outside of the
920 * file structure being operated on;
922 static int ib_umad_open(struct inode *inode, struct file *filp)
924 struct ib_umad_port *port;
925 struct ib_umad_file *file;
928 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
930 mutex_lock(&port->file_mutex);
936 file = kzalloc(sizeof *file, GFP_KERNEL);
940 mutex_init(&file->mutex);
941 spin_lock_init(&file->send_lock);
942 INIT_LIST_HEAD(&file->recv_list);
943 INIT_LIST_HEAD(&file->send_list);
944 init_waitqueue_head(&file->recv_wait);
947 filp->private_data = file;
949 list_add_tail(&file->port_list, &port->file_list);
951 ret = nonseekable_open(inode, filp);
953 list_del(&file->port_list);
958 kobject_get(&port->umad_dev->kobj);
961 mutex_unlock(&port->file_mutex);
965 static int ib_umad_close(struct inode *inode, struct file *filp)
967 struct ib_umad_file *file = filp->private_data;
968 struct ib_umad_device *dev = file->port->umad_dev;
969 struct ib_umad_packet *packet, *tmp;
973 mutex_lock(&file->port->file_mutex);
974 mutex_lock(&file->mutex);
976 already_dead = file->agents_dead;
977 file->agents_dead = 1;
979 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
981 ib_free_recv_mad(packet->recv_wc);
985 list_del(&file->port_list);
987 mutex_unlock(&file->mutex);
990 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
992 ib_unregister_mad_agent(file->agent[i]);
994 mutex_unlock(&file->port->file_mutex);
997 kobject_put(&dev->kobj);
1002 static const struct file_operations umad_fops = {
1003 .owner = THIS_MODULE,
1004 .read = ib_umad_read,
1005 .write = ib_umad_write,
1006 .poll = ib_umad_poll,
1007 .unlocked_ioctl = ib_umad_ioctl,
1008 #ifdef CONFIG_COMPAT
1009 .compat_ioctl = ib_umad_compat_ioctl,
1011 .open = ib_umad_open,
1012 .release = ib_umad_close,
1013 .llseek = no_llseek,
1016 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1018 struct ib_umad_port *port;
1019 struct ib_port_modify props = {
1020 .set_port_cap_mask = IB_PORT_SM
1024 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1026 if (filp->f_flags & O_NONBLOCK) {
1027 if (down_trylock(&port->sm_sem)) {
1032 if (down_interruptible(&port->sm_sem)) {
1038 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1042 filp->private_data = port;
1044 ret = nonseekable_open(inode, filp);
1046 goto err_clr_sm_cap;
1048 kobject_get(&port->umad_dev->kobj);
1053 swap(props.set_port_cap_mask, props.clr_port_cap_mask);
1054 ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1063 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1065 struct ib_umad_port *port = filp->private_data;
1066 struct ib_port_modify props = {
1067 .clr_port_cap_mask = IB_PORT_SM
1071 mutex_lock(&port->file_mutex);
1073 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1074 mutex_unlock(&port->file_mutex);
1078 kobject_put(&port->umad_dev->kobj);
1083 static const struct file_operations umad_sm_fops = {
1084 .owner = THIS_MODULE,
1085 .open = ib_umad_sm_open,
1086 .release = ib_umad_sm_close,
1087 .llseek = no_llseek,
1090 static struct ib_client umad_client = {
1092 .add = ib_umad_add_one,
1093 .remove = ib_umad_remove_one
1096 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1099 struct ib_umad_port *port = dev_get_drvdata(dev);
1104 return sprintf(buf, "%s\n", port->ib_dev->name);
1106 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1108 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1111 struct ib_umad_port *port = dev_get_drvdata(dev);
1116 return sprintf(buf, "%d\n", port->port_num);
1118 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1120 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1121 __stringify(IB_USER_MAD_ABI_VERSION));
1123 static dev_t overflow_maj;
1124 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
1125 static int find_overflow_devnum(struct ib_device *device)
1129 if (!overflow_maj) {
1130 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
1133 dev_err(&device->dev,
1134 "couldn't register dynamic device number\n");
1139 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
1140 if (ret >= IB_UMAD_MAX_PORTS)
1146 static int ib_umad_init_port(struct ib_device *device, int port_num,
1147 struct ib_umad_device *umad_dev,
1148 struct ib_umad_port *port)
1153 spin_lock(&port_lock);
1154 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1155 if (devnum >= IB_UMAD_MAX_PORTS) {
1156 spin_unlock(&port_lock);
1157 devnum = find_overflow_devnum(device);
1161 spin_lock(&port_lock);
1162 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1163 base = devnum + overflow_maj;
1164 set_bit(devnum, overflow_map);
1166 port->dev_num = devnum;
1167 base = devnum + base_dev;
1168 set_bit(devnum, dev_map);
1170 spin_unlock(&port_lock);
1172 port->ib_dev = device;
1173 port->port_num = port_num;
1174 sema_init(&port->sm_sem, 1);
1175 mutex_init(&port->file_mutex);
1176 INIT_LIST_HEAD(&port->file_list);
1178 cdev_init(&port->cdev, &umad_fops);
1179 port->cdev.owner = THIS_MODULE;
1180 port->cdev.kobj.parent = &umad_dev->kobj;
1181 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1182 if (cdev_add(&port->cdev, base, 1))
1185 port->dev = device_create(umad_class, device->dma_device,
1186 port->cdev.dev, port,
1187 "umad%d", port->dev_num);
1188 if (IS_ERR(port->dev))
1191 if (device_create_file(port->dev, &dev_attr_ibdev))
1193 if (device_create_file(port->dev, &dev_attr_port))
1196 base += IB_UMAD_MAX_PORTS;
1197 cdev_init(&port->sm_cdev, &umad_sm_fops);
1198 port->sm_cdev.owner = THIS_MODULE;
1199 port->sm_cdev.kobj.parent = &umad_dev->kobj;
1200 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1201 if (cdev_add(&port->sm_cdev, base, 1))
1204 port->sm_dev = device_create(umad_class, device->dma_device,
1205 port->sm_cdev.dev, port,
1206 "issm%d", port->dev_num);
1207 if (IS_ERR(port->sm_dev))
1210 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1212 if (device_create_file(port->sm_dev, &dev_attr_port))
1218 device_destroy(umad_class, port->sm_cdev.dev);
1221 cdev_del(&port->sm_cdev);
1224 device_destroy(umad_class, port->cdev.dev);
1227 cdev_del(&port->cdev);
1228 if (port->dev_num < IB_UMAD_MAX_PORTS)
1229 clear_bit(devnum, dev_map);
1231 clear_bit(devnum, overflow_map);
1236 static void ib_umad_kill_port(struct ib_umad_port *port)
1238 struct ib_umad_file *file;
1241 dev_set_drvdata(port->dev, NULL);
1242 dev_set_drvdata(port->sm_dev, NULL);
1244 device_destroy(umad_class, port->cdev.dev);
1245 device_destroy(umad_class, port->sm_cdev.dev);
1247 cdev_del(&port->cdev);
1248 cdev_del(&port->sm_cdev);
1250 mutex_lock(&port->file_mutex);
1252 port->ib_dev = NULL;
1254 list_for_each_entry(file, &port->file_list, port_list) {
1255 mutex_lock(&file->mutex);
1256 file->agents_dead = 1;
1257 mutex_unlock(&file->mutex);
1259 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1260 if (file->agent[id])
1261 ib_unregister_mad_agent(file->agent[id]);
1264 mutex_unlock(&port->file_mutex);
1266 if (port->dev_num < IB_UMAD_MAX_PORTS)
1267 clear_bit(port->dev_num, dev_map);
1269 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1272 static void ib_umad_add_one(struct ib_device *device)
1274 struct ib_umad_device *umad_dev;
1278 s = rdma_start_port(device);
1279 e = rdma_end_port(device);
1281 umad_dev = kzalloc(sizeof *umad_dev +
1282 (e - s + 1) * sizeof (struct ib_umad_port),
1287 kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1289 for (i = s; i <= e; ++i) {
1290 if (!rdma_cap_ib_mad(device, i))
1293 umad_dev->port[i - s].umad_dev = umad_dev;
1295 if (ib_umad_init_port(device, i, umad_dev,
1296 &umad_dev->port[i - s]))
1305 ib_set_client_data(device, &umad_client, umad_dev);
1311 if (!rdma_cap_ib_mad(device, i))
1314 ib_umad_kill_port(&umad_dev->port[i - s]);
1317 kobject_put(&umad_dev->kobj);
1320 static void ib_umad_remove_one(struct ib_device *device)
1322 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1328 for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
1329 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
1330 ib_umad_kill_port(&umad_dev->port[i]);
1333 kobject_put(&umad_dev->kobj);
1336 static char *umad_devnode(struct device *dev, umode_t *mode)
1338 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1341 static int __init ib_umad_init(void)
1345 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1348 pr_err("couldn't register device number\n");
1352 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1353 if (IS_ERR(umad_class)) {
1354 ret = PTR_ERR(umad_class);
1355 pr_err("couldn't create class infiniband_mad\n");
1359 umad_class->devnode = umad_devnode;
1361 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1363 pr_err("couldn't create abi_version attribute\n");
1367 ret = ib_register_client(&umad_client);
1369 pr_err("couldn't register ib_umad client\n");
1376 class_destroy(umad_class);
1379 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1385 static void __exit ib_umad_cleanup(void)
1387 ib_unregister_client(&umad_client);
1388 class_destroy(umad_class);
1389 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1391 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1394 module_init(ib_umad_init);
1395 module_exit(ib_umad_cleanup);