/* * Copyright (c) 2004 Topspin Communications. All rights reserved. * Copyright (c) 2005 Voltaire, Inc. All rights reserved. * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * $Id: user_mad.c 5596 2006-03-03 01:00:07Z sean.hefty $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Roland Dreier"); MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); MODULE_LICENSE("Dual BSD/GPL"); enum { IB_UMAD_MAX_PORTS = 64, IB_UMAD_MAX_AGENTS = 32, IB_UMAD_MAJOR = 231, IB_UMAD_MINOR_BASE = 0 }; /* * Our lifetime rules for these structs are the following: each time a * device special file is opened, we look up the corresponding struct * ib_umad_port by minor in the umad_port[] table while holding the * port_lock. If this lookup succeeds, we take a reference on the * ib_umad_port's struct ib_umad_device while still holding the * port_lock; if the lookup fails, we fail the open(). We drop these * references in the corresponding close(). * * In addition to references coming from open character devices, there * is one more reference to each ib_umad_device representing the * module's reference taken when allocating the ib_umad_device in * ib_umad_add_one(). * * When destroying an ib_umad_device, we clear all of its * ib_umad_ports from umad_port[] while holding port_lock before * dropping the module's reference to the ib_umad_device. This is * always safe because any open() calls will either succeed and obtain * a reference before we clear the umad_port[] entries, or fail after * we clear the umad_port[] entries. */ struct ib_umad_port { struct cdev *dev; struct class_device *class_dev; struct cdev *sm_dev; struct class_device *sm_class_dev; struct semaphore sm_sem; struct rw_semaphore mutex; struct list_head file_list; struct ib_device *ib_dev; struct ib_umad_device *umad_dev; int dev_num; u8 port_num; }; struct ib_umad_device { int start_port, end_port; struct kref ref; struct ib_umad_port port[0]; }; struct ib_umad_file { struct ib_umad_port *port; struct list_head recv_list; struct list_head send_list; struct list_head port_list; spinlock_t recv_lock; spinlock_t send_lock; wait_queue_head_t recv_wait; struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; int agents_dead; }; struct ib_umad_packet { struct ib_mad_send_buf *msg; struct ib_mad_recv_wc *recv_wc; struct list_head list; int length; struct ib_user_mad mad; }; static struct class *umad_class; static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); static DEFINE_SPINLOCK(port_lock); static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS]; static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2); static void ib_umad_add_one(struct ib_device *device); static void ib_umad_remove_one(struct ib_device *device); static void ib_umad_release_dev(struct kref *ref) { struct ib_umad_device *dev = container_of(ref, struct ib_umad_device, ref); kfree(dev); } /* caller must hold port->mutex at least for reading */ static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) { return file->agents_dead ? NULL : file->agent[id]; } static int queue_packet(struct ib_umad_file *file, struct ib_mad_agent *agent, struct ib_umad_packet *packet) { int ret = 1; down_read(&file->port->mutex); for (packet->mad.hdr.id = 0; packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; packet->mad.hdr.id++) if (agent == __get_agent(file, packet->mad.hdr.id)) { spin_lock_irq(&file->recv_lock); list_add_tail(&packet->list, &file->recv_list); spin_unlock_irq(&file->recv_lock); wake_up_interruptible(&file->recv_wait); ret = 0; break; } up_read(&file->port->mutex); return ret; } static void dequeue_send(struct ib_umad_file *file, struct ib_umad_packet *packet) { spin_lock_irq(&file->send_lock); list_del(&packet->list); spin_unlock_irq(&file->send_lock); } static void send_handler(struct ib_mad_agent *agent, struct ib_mad_send_wc *send_wc) { struct ib_umad_file *file = agent->context; struct ib_umad_packet *packet = send_wc->send_buf->context[0]; dequeue_send(file, packet); ib_destroy_ah(packet->msg->ah); ib_free_send_mad(packet->msg); if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { packet->length = IB_MGMT_MAD_HDR; packet->mad.hdr.status = ETIMEDOUT; if (!queue_packet(file, agent, packet)) return; } kfree(packet); } static void recv_handler(struct ib_mad_agent *agent, struct ib_mad_recv_wc *mad_recv_wc) { struct ib_umad_file *file = agent->context; struct ib_umad_packet *packet; if (mad_recv_wc->wc->status != IB_WC_SUCCESS) goto err1; packet = kzalloc(sizeof *packet, GFP_KERNEL); if (!packet) goto err1; packet->length = mad_recv_wc->mad_len; packet->recv_wc = mad_recv_wc; packet->mad.hdr.status = 0; packet->mad.hdr.length = sizeof (struct ib_user_mad) + mad_recv_wc->mad_len; packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid); packet->mad.hdr.sl = mad_recv_wc->wc->sl; packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); if (packet->mad.hdr.grh_present) { /* XXX parse GRH */ packet->mad.hdr.gid_index = 0; packet->mad.hdr.hop_limit = 0; packet->mad.hdr.traffic_class = 0; memset(packet->mad.hdr.gid, 0, 16); packet->mad.hdr.flow_label = 0; } if (queue_packet(file, agent, packet)) goto err2; return; err2: kfree(packet); err1: ib_free_recv_mad(mad_recv_wc); } static ssize_t copy_recv_mad(char __user *buf, struct ib_umad_packet *packet, size_t count) { struct ib_mad_recv_buf *recv_buf; int left, seg_payload, offset, max_seg_payload; /* We need enough room to copy the first (or only) MAD segment. */ recv_buf = &packet->recv_wc->recv_buf; if ((packet->length <= sizeof (*recv_buf->mad) && count < sizeof (packet->mad) + packet->length) || (packet->length > sizeof (*recv_buf->mad) && count < sizeof (packet->mad) + sizeof (*recv_buf->mad))) return -EINVAL; if (copy_to_user(buf, &packet->mad, sizeof (packet->mad))) return -EFAULT; buf += sizeof (packet->mad); seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad)); if (copy_to_user(buf, recv_buf->mad, seg_payload)) return -EFAULT; if (seg_payload < packet->length) { /* * Multipacket RMPP MAD message. Copy remainder of message. * Note that last segment may have a shorter payload. */ if (count < sizeof (packet->mad) + packet->length) { /* * The buffer is too small, return the first RMPP segment, * which includes the RMPP message length. */ return -ENOSPC; } offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); max_seg_payload = sizeof (struct ib_mad) - offset; for (left = packet->length - seg_payload, buf += seg_payload; left; left -= seg_payload, buf += seg_payload) { recv_buf = container_of(recv_buf->list.next, struct ib_mad_recv_buf, list); seg_payload = min(left, max_seg_payload); if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, seg_payload)) return -EFAULT; } } return sizeof (packet->mad) + packet->length; } static ssize_t copy_send_mad(char __user *buf, struct ib_umad_packet *packet, size_t count) { ssize_t size = sizeof (packet->mad) + packet->length; if (count < size) return -EINVAL; if (copy_to_user(buf, &packet->mad, size)) return -EFAULT; return size; } static ssize_t ib_umad_read(struct file *filp, char __user *buf, size_t count, loff_t *pos) { struct ib_umad_file *file = filp->private_data; struct ib_umad_packet *packet; ssize_t ret; if (count < sizeof (struct ib_user_mad)) return -EINVAL; spin_lock_irq(&file->recv_lock); while (list_empty(&file->recv_list)) { spin_unlock_irq(&file->recv_lock); if (filp->f_flags & O_NONBLOCK) return -EAGAIN; if (wait_event_interruptible(file->recv_wait, !list_empty(&file->recv_list))) return -ERESTARTSYS; spin_lock_irq(&file->recv_lock); } packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); list_del(&packet->list); spin_unlock_irq(&file->recv_lock); if (packet->recv_wc) ret = copy_recv_mad(buf, packet, count); else ret = copy_send_mad(buf, packet, count); if (ret < 0) { /* Requeue packet */ spin_lock_irq(&file->recv_lock); list_add(&packet->list, &file->recv_list); spin_unlock_irq(&file->recv_lock); } else { if (packet->recv_wc) ib_free_recv_mad(packet->recv_wc); kfree(packet); } return ret; } static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) { int left, seg; /* Copy class specific header */ if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, msg->hdr_len - IB_MGMT_RMPP_HDR)) return -EFAULT; /* All headers are in place. Copy data segments. */ for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; seg++, left -= msg->seg_size, buf += msg->seg_size) { if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, min(left, msg->seg_size))) return -EFAULT; } return 0; } static int same_destination(struct ib_user_mad_hdr *hdr1, struct ib_user_mad_hdr *hdr2) { if (!hdr1->grh_present && !hdr2->grh_present) return (hdr1->lid == hdr2->lid); if (hdr1->grh_present && hdr2->grh_present) return !memcmp(hdr1->gid, hdr2->gid, 16); return 0; } static int is_duplicate(struct ib_umad_file *file, struct ib_umad_packet *packet) { struct ib_umad_packet *sent_packet; struct ib_mad_hdr *sent_hdr, *hdr; hdr = (struct ib_mad_hdr *) packet->mad.data; list_for_each_entry(sent_packet, &file->send_list, list) { sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; if ((hdr->tid != sent_hdr->tid) || (hdr->mgmt_class != sent_hdr->mgmt_class)) continue; /* * No need to be overly clever here. If two new operations have * the same TID, reject the second as a duplicate. This is more * restrictive than required by the spec. */ if (!ib_response_mad((struct ib_mad *) hdr)) { if (!ib_response_mad((struct ib_mad *) sent_hdr)) return 1; continue; } else if (!ib_response_mad((struct ib_mad *) sent_hdr)) continue; if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) return 1; } return 0; } static ssize_t ib_umad_write(struct file *filp, const char __user *buf, size_t count, loff_t *pos) { struct ib_umad_file *file = filp->private_data; struct ib_umad_packet *packet; struct ib_mad_agent *agent; struct ib_ah_attr ah_attr; struct ib_ah *ah; struct ib_rmpp_mad *rmpp_mad; __be64 *tid; int ret, data_len, hdr_len, copy_offset, rmpp_active; if (count < sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR) return -EINVAL; packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); if (!packet) return -ENOMEM; if (copy_from_user(&packet->mad, buf, sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) { ret = -EFAULT; goto err; } if (packet->mad.hdr.id < 0 || packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { ret = -EINVAL; goto err; } down_read(&file->port->mutex); agent = __get_agent(file, packet->mad.hdr.id); if (!agent) { ret = -EINVAL; goto err_up; } memset(&ah_attr, 0, sizeof ah_attr); ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid); ah_attr.sl = packet->mad.hdr.sl; ah_attr.src_path_bits = packet->mad.hdr.path_bits; ah_attr.port_num = file->port->port_num; if (packet->mad.hdr.grh_present) { ah_attr.ah_flags = IB_AH_GRH; memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16); ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label); ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit; ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class; } ah = ib_create_ah(agent->qp->pd, &ah_attr); if (IS_ERR(ah)) { ret = PTR_ERR(ah); goto err_up; } rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) { copy_offset = IB_MGMT_MAD_HDR; rmpp_active = 0; } else { copy_offset = IB_MGMT_RMPP_HDR; rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE; } data_len = count - sizeof (struct ib_user_mad) - hdr_len; packet->msg = ib_create_send_mad(agent, be32_to_cpu(packet->mad.hdr.qpn), 0, rmpp_active, hdr_len, data_len, GFP_KERNEL); if (IS_ERR(packet->msg)) { ret = PTR_ERR(packet->msg); goto err_ah; } packet->msg->ah = ah; packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; packet->msg->retries = packet->mad.hdr.retries; packet->msg->context[0] = packet; /* Copy MAD header. Any RMPP header is already in place. */ memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); buf += sizeof (struct ib_user_mad); if (!rmpp_active) { if (copy_from_user(packet->msg->mad + copy_offset, buf + copy_offset, hdr_len + data_len - copy_offset)) { ret = -EFAULT; goto err_msg; } } else { ret = copy_rmpp_mad(packet->msg, buf); if (ret) goto err_msg; } /* * Set the high-order part of the transaction ID to make MADs from * different agents unique, and allow routing responses back to the * original requestor. */ if (!ib_response_mad(packet->msg->mad)) { tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | (be64_to_cpup(tid) & 0xffffffff)); rmpp_mad->mad_hdr.tid = *tid; } spin_lock_irq(&file->send_lock); ret = is_duplicate(file, packet); if (!ret) list_add_tail(&packet->list, &file->send_list); spin_unlock_irq(&file->send_lock); if (ret) { ret = -EINVAL; goto err_msg; } ret = ib_post_send_mad(packet->msg, NULL); if (ret) goto err_send; up_read(&file->port->mutex); return count; err_send: dequeue_send(file, packet); err_msg: ib_free_send_mad(packet->msg); err_ah: ib_destroy_ah(ah); err_up: up_read(&file->port->mutex); err: kfree(packet); return ret; } static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) { struct ib_umad_file *file = filp->private_data; /* we will always be able to post a MAD send */ unsigned int mask = POLLOUT | POLLWRNORM; poll_wait(filp, &file->recv_wait, wait); if (!list_empty(&file->recv_list)) mask |= POLLIN | POLLRDNORM; return mask; } static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) { struct ib_user_mad_reg_req ureq; struct ib_mad_reg_req req; struct ib_mad_agent *agent; int agent_id; int ret; down_write(&file->port->mutex); if (!file->port->ib_dev) { ret = -EPIPE; goto out; } if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) { ret = -EFAULT; goto out; } if (ureq.qpn != 0 && ureq.qpn != 1) { ret = -EINVAL; goto out; } for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) if (!__get_agent(file, agent_id)) goto found; ret = -ENOMEM; goto out; found: if (ureq.mgmt_class) { req.mgmt_class = ureq.mgmt_class; req.mgmt_class_version = ureq.mgmt_class_version; memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask); memcpy(req.oui, ureq.oui, sizeof req.oui); } agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, ureq.mgmt_class ? &req : NULL, ureq.rmpp_version, send_handler, recv_handler, file); if (IS_ERR(agent)) { ret = PTR_ERR(agent); goto out; } if (put_user(agent_id, (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { ret = -EFAULT; ib_unregister_mad_agent(agent); goto out; } file->agent[agent_id] = agent; ret = 0; out: up_write(&file->port->mutex); return ret; } static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg) { struct ib_mad_agent *agent = NULL; u32 id; int ret = 0; if (get_user(id, (u32 __user *) arg)) return -EFAULT; down_write(&file->port->mutex); if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) { ret = -EINVAL; goto out; } agent = file->agent[id]; file->agent[id] = NULL; out: up_write(&file->port->mutex); if (agent) ib_unregister_mad_agent(agent); return ret; } static long ib_umad_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { switch (cmd) { case IB_USER_MAD_REGISTER_AGENT: return ib_umad_reg_agent(filp->private_data, arg); case IB_USER_MAD_UNREGISTER_AGENT: return ib_umad_unreg_agent(filp->private_data, arg); default: return -ENOIOCTLCMD; } } static int ib_umad_open(struct inode *inode, struct file *filp) { struct ib_umad_port *port; struct ib_umad_file *file; int ret = 0; spin_lock(&port_lock); port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE]; if (port) kref_get(&port->umad_dev->ref); spin_unlock(&port_lock); if (!port) return -ENXIO; down_write(&port->mutex); if (!port->ib_dev) { ret = -ENXIO; goto out; } file = kzalloc(sizeof *file, GFP_KERNEL); if (!file) { kref_put(&port->umad_dev->ref, ib_umad_release_dev); ret = -ENOMEM; goto out; } spin_lock_init(&file->recv_lock); spin_lock_init(&file->send_lock); INIT_LIST_HEAD(&file->recv_list); INIT_LIST_HEAD(&file->send_list); init_waitqueue_head(&file->recv_wait); file->port = port; filp->private_data = file; list_add_tail(&file->port_list, &port->file_list); out: up_write(&port->mutex); return ret; } static int ib_umad_close(struct inode *inode, struct file *filp) { struct ib_umad_file *file = filp->private_data; struct ib_umad_device *dev = file->port->umad_dev; struct ib_umad_packet *packet, *tmp; int already_dead; int i; down_write(&file->port->mutex); already_dead = file->agents_dead; file->agents_dead = 1; list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { if (packet->recv_wc) ib_free_recv_mad(packet->recv_wc); kfree(packet); } list_del(&file->port_list); downgrade_write(&file->port->mutex); if (!already_dead) for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) if (file->agent[i]) ib_unregister_mad_agent(file->agent[i]); up_read(&file->port->mutex); kfree(file); kref_put(&dev->ref, ib_umad_release_dev); return 0; } static struct file_operations umad_fops = { .owner = THIS_MODULE, .read = ib_umad_read, .write = ib_umad_write, .poll = ib_umad_poll, .unlocked_ioctl = ib_umad_ioctl, .compat_ioctl = ib_umad_ioctl, .open = ib_umad_open, .release = ib_umad_close }; static int ib_umad_sm_open(struct inode *inode, struct file *filp) { struct ib_umad_port *port; struct ib_port_modify props = { .set_port_cap_mask = IB_PORT_SM }; int ret; spin_lock(&port_lock); port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS]; if (port) kref_get(&port->umad_dev->ref); spin_unlock(&port_lock); if (!port) return -ENXIO; if (filp->f_flags & O_NONBLOCK) { if (down_trylock(&port->sm_sem)) { ret = -EAGAIN; goto fail; } } else { if (down_interruptible(&port->sm_sem)) { ret = -ERESTARTSYS; goto fail; } } ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); if (ret) { up(&port->sm_sem); goto fail; } filp->private_data = port; return 0; fail: kref_put(&port->umad_dev->ref, ib_umad_release_dev); return ret; } static int ib_umad_sm_close(struct inode *inode, struct file *filp) { struct ib_umad_port *port = filp->private_data; struct ib_port_modify props = { .clr_port_cap_mask = IB_PORT_SM }; int ret = 0; down_write(&port->mutex); if (port->ib_dev) ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); up_write(&port->mutex); up(&port->sm_sem); kref_put(&port->umad_dev->ref, ib_umad_release_dev); return ret; } static struct file_operations umad_sm_fops = { .owner = THIS_MODULE, .open = ib_umad_sm_open, .release = ib_umad_sm_close }; static struct ib_client umad_client = { .name = "umad", .add = ib_umad_add_one, .remove = ib_umad_remove_one }; static ssize_t show_ibdev(struct class_device *class_dev, char *buf) { struct ib_umad_port *port = class_get_devdata(class_dev); if (!port) return -ENODEV; return sprintf(buf, "%s\n", port->ib_dev->name); } static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); static ssize_t show_port(struct class_device *class_dev, char *buf) { struct ib_umad_port *port = class_get_devdata(class_dev); if (!port) return -ENODEV; return sprintf(buf, "%d\n", port->port_num); } static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); static ssize_t show_abi_version(struct class *class, char *buf) { return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); } static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); static int ib_umad_init_port(struct ib_device *device, int port_num, struct ib_umad_port *port) { spin_lock(&port_lock); port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); if (port->dev_num >= IB_UMAD_MAX_PORTS) { spin_unlock(&port_lock); return -1; } set_bit(port->dev_num, dev_map); spin_unlock(&port_lock); port->ib_dev = device; port->port_num = port_num; init_MUTEX(&port->sm_sem); init_rwsem(&port->mutex); INIT_LIST_HEAD(&port->file_list); port->dev = cdev_alloc(); if (!port->dev) return -1; port->dev->owner = THIS_MODULE; port->dev->ops = &umad_fops; kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num); if (cdev_add(port->dev, base_dev + port->dev_num, 1)) goto err_cdev; port->class_dev = class_device_create(umad_class, NULL, port->dev->dev, device->dma_device, "umad%d", port->dev_num); if (IS_ERR(port->class_dev)) goto err_cdev; if (class_device_create_file(port->class_dev, &class_device_attr_ibdev)) goto err_class; if (class_device_create_file(port->class_dev, &class_device_attr_port)) goto err_class; port->sm_dev = cdev_alloc(); if (!port->sm_dev) goto err_class; port->sm_dev->owner = THIS_MODULE; port->sm_dev->ops = &umad_sm_fops; kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num); if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1)) goto err_sm_cdev; port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev, device->dma_device, "issm%d", port->dev_num); if (IS_ERR(port->sm_class_dev)) goto err_sm_cdev; class_set_devdata(port->class_dev, port); class_set_devdata(port->sm_class_dev, port); if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev)) goto err_sm_class; if (class_device_create_file(port->sm_class_dev, &class_device_attr_port)) goto err_sm_class; spin_lock(&port_lock); umad_port[port->dev_num] = port; spin_unlock(&port_lock); return 0; err_sm_class: class_device_destroy(umad_class, port->sm_dev->dev); err_sm_cdev: cdev_del(port->sm_dev); err_class: class_device_destroy(umad_class, port->dev->dev); err_cdev: cdev_del(port->dev); clear_bit(port->dev_num, dev_map); return -1; } static void ib_umad_kill_port(struct ib_umad_port *port) { struct ib_umad_file *file; int id; class_set_devdata(port->class_dev, NULL); class_set_devdata(port->sm_class_dev, NULL); class_device_destroy(umad_class, port->dev->dev); class_device_destroy(umad_class, port->sm_dev->dev); cdev_del(port->dev); cdev_del(port->sm_dev); spin_lock(&port_lock); umad_port[port->dev_num] = NULL; spin_unlock(&port_lock); down_write(&port->mutex); port->ib_dev = NULL; /* * Now go through the list of files attached to this port and * unregister all of their MAD agents. We need to hold * port->mutex while doing this to avoid racing with * ib_umad_close(), but we can't hold the mutex for writing * while calling ib_unregister_mad_agent(), since that might * deadlock by calling back into queue_packet(). So we * downgrade our lock to a read lock, and then drop and * reacquire the write lock for the next iteration. * * We do list_del_init() on the file's list_head so that the * list_del in ib_umad_close() is still OK, even after the * file is removed from the list. */ while (!list_empty(&port->file_list)) { file = list_entry(port->file_list.next, struct ib_umad_file, port_list); file->agents_dead = 1; list_del_init(&file->port_list); downgrade_write(&port->mutex); for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) if (file->agent[id]) ib_unregister_mad_agent(file->agent[id]); up_read(&port->mutex); down_write(&port->mutex); } up_write(&port->mutex); clear_bit(port->dev_num, dev_map); } static void ib_umad_add_one(struct ib_device *device) { struct ib_umad_device *umad_dev; int s, e, i; if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) return; if (device->node_type == RDMA_NODE_IB_SWITCH) s = e = 0; else { s = 1; e = device->phys_port_cnt; } umad_dev = kzalloc(sizeof *umad_dev + (e - s + 1) * sizeof (struct ib_umad_port), GFP_KERNEL); if (!umad_dev) return; kref_init(&umad_dev->ref); umad_dev->start_port = s; umad_dev->end_port = e; for (i = s; i <= e; ++i) { umad_dev->port[i - s].umad_dev = umad_dev; if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) goto err; } ib_set_client_data(device, &umad_client, umad_dev); return; err: while (--i >= s) ib_umad_kill_port(&umad_dev->port[i - s]); kref_put(&umad_dev->ref, ib_umad_release_dev); } static void ib_umad_remove_one(struct ib_device *device) { struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); int i; if (!umad_dev) return; for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) ib_umad_kill_port(&umad_dev->port[i]); kref_put(&umad_dev->ref, ib_umad_release_dev); } static int __init ib_umad_init(void) { int ret; ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, "infiniband_mad"); if (ret) { printk(KERN_ERR "user_mad: couldn't register device number\n"); goto out; } umad_class = class_create(THIS_MODULE, "infiniband_mad"); if (IS_ERR(umad_class)) { ret = PTR_ERR(umad_class); printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); goto out_chrdev; } ret = class_create_file(umad_class, &class_attr_abi_version); if (ret) { printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); goto out_class; } ret = ib_register_client(&umad_client); if (ret) { printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); goto out_class; } return 0; out_class: class_destroy(umad_class); out_chrdev: unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); out: return ret; } static void __exit ib_umad_cleanup(void) { ib_unregister_client(&umad_client); class_destroy(umad_class); unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); } module_init(ib_umad_init); module_exit(ib_umad_cleanup);