| /* |
| * 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 <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/fs.h> |
| #include <linux/cdev.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/poll.h> |
| #include <linux/rwsem.h> |
| #include <linux/kref.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/semaphore.h> |
| |
| #include <rdma/ib_mad.h> |
| #include <rdma/ib_user_mad.h> |
| |
| 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; |
| u8 use_pkey_index; |
| u8 already_used; |
| }; |
| |
| 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); |
| |
| 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); |
| } |
| |
| static int hdr_size(struct ib_umad_file *file) |
| { |
| return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) : |
| sizeof (struct ib_user_mad_hdr_old); |
| } |
| |
| /* 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 = hdr_size(file) + 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.pkey_index = mad_recv_wc->wc->pkey_index; |
| packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); |
| if (packet->mad.hdr.grh_present) { |
| struct ib_ah_attr ah_attr; |
| |
| ib_init_ah_from_wc(agent->device, agent->port_num, |
| mad_recv_wc->wc, mad_recv_wc->recv_buf.grh, |
| &ah_attr); |
| |
| packet->mad.hdr.gid_index = ah_attr.grh.sgid_index; |
| packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit; |
| packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class; |
| memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16); |
| packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label); |
| } |
| |
| 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(struct ib_umad_file *file, 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 < hdr_size(file) + packet->length) || |
| (packet->length > sizeof (*recv_buf->mad) && |
| count < hdr_size(file) + sizeof (*recv_buf->mad))) |
| return -EINVAL; |
| |
| if (copy_to_user(buf, &packet->mad, hdr_size(file))) |
| return -EFAULT; |
| |
| buf += hdr_size(file); |
| 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 < hdr_size(file) + 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 hdr_size(file) + packet->length; |
| } |
| |
| static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, |
| struct ib_umad_packet *packet, size_t count) |
| { |
| ssize_t size = hdr_size(file) + packet->length; |
| |
| if (count < size) |
| return -EINVAL; |
| |
| if (copy_to_user(buf, &packet->mad, hdr_size(file))) |
| return -EFAULT; |
| |
| buf += hdr_size(file); |
| |
| if (copy_to_user(buf, packet->mad.data, packet->length)) |
| 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 < hdr_size(file)) |
| 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(file, buf, packet, count); |
| else |
| ret = copy_send_mad(file, 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 < hdr_size(file) + 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, hdr_size(file))) { |
| ret = -EFAULT; |
| goto err; |
| } |
| |
| if (packet->mad.hdr.id < 0 || |
| packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| buf += hdr_size(file); |
| |
| if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { |
| ret = -EFAULT; |
| 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.sgid_index = packet->mad.hdr.gid_index; |
| 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 - hdr_size(file) - hdr_len; |
| packet->msg = ib_create_send_mad(agent, |
| be32_to_cpu(packet->mad.hdr.qpn), |
| packet->mad.hdr.pkey_index, 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); |
| |
| 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; |
| } |
| |
| if (!file->already_used) { |
| file->already_used = 1; |
| if (!file->use_pkey_index) { |
| printk(KERN_WARNING "user_mad: process %s did not enable " |
| "P_Key index support.\n", current->comm); |
| printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt " |
| "has info on the new ABI.\n"); |
| } |
| } |
| |
| 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_enable_pkey(struct ib_umad_file *file) |
| { |
| int ret = 0; |
| |
| down_write(&file->port->mutex); |
| if (file->already_used) |
| ret = -EINVAL; |
| else |
| file->use_pkey_index = 1; |
| up_write(&file->port->mutex); |
| |
| 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); |
| case IB_USER_MAD_ENABLE_PKEY: |
| return ib_umad_enable_pkey(filp->private_data); |
| 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 const 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 const 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); |