--- /dev/null
+/*
+ * 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.
+ * Copyright (c) 2008 Cisco. 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.
+ */
+
+#define pr_fmt(fmt) "user_mad: " fmt
+
+#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/mutex.h>
+#include <linux/kref.h>
+#include <linux/compat.h>
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.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:
+ * device special file is opened, we take a reference on the
+ * ib_umad_port's struct ib_umad_device. 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 drop the module's reference.
+ */
+
+struct ib_umad_port {
+ struct cdev cdev;
+ struct device *dev;
+
+ struct cdev sm_cdev;
+ struct device *sm_dev;
+ struct semaphore sm_sem;
+
+ struct mutex file_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 kobject kobj;
+ struct ib_umad_port port[0];
+};
+
+struct ib_umad_file {
+ struct mutex mutex;
+ struct ib_umad_port *port;
+ struct list_head recv_list;
+ struct list_head send_list;
+ struct list_head port_list;
+ 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 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 kobject *kobj)
+{
+ struct ib_umad_device *dev =
+ container_of(kobj, struct ib_umad_device, kobj);
+
+ kfree(dev);
+}
+
+static struct kobj_type ib_umad_dev_ktype = {
+ .release = ib_umad_release_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 file->mutex */
+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;
+
+ mutex_lock(&file->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)) {
+ list_add_tail(&packet->list, &file->recv_list);
+ wake_up_interruptible(&file->recv_wait);
+ ret = 0;
+ break;
+ }
+
+ mutex_unlock(&file->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;
+
+ mutex_lock(&file->mutex);
+
+ while (list_empty(&file->recv_list)) {
+ mutex_unlock(&file->mutex);
+
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ if (wait_event_interruptible(file->recv_wait,
+ !list_empty(&file->recv_list)))
+ return -ERESTARTSYS;
+
+ mutex_lock(&file->mutex);
+ }
+
+ packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
+ list_del(&packet->list);
+
+ mutex_unlock(&file->mutex);
+
+ 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 */
+ mutex_lock(&file->mutex);
+ list_add(&packet->list, &file->recv_list);
+ mutex_unlock(&file->mutex);
+ } 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 >= 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;
+ }
+
+ mutex_lock(&file->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)
+ && ib_mad_kernel_rmpp_agent(agent)) {
+ copy_offset = IB_MGMT_RMPP_HDR;
+ rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
+ IB_MGMT_RMPP_FLAG_ACTIVE;
+ } else {
+ copy_offset = IB_MGMT_MAD_HDR;
+ rmpp_active = 0;
+ }
+
+ 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;
+ }
+
+ if (!ib_mad_kernel_rmpp_agent(agent)
+ && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
+ && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
+ spin_lock_irq(&file->send_lock);
+ list_add_tail(&packet->list, &file->send_list);
+ spin_unlock_irq(&file->send_lock);
+ } else {
+ 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;
+
+ mutex_unlock(&file->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:
+ mutex_unlock(&file->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, void __user *arg,
+ int compat_method_mask)
+{
+ struct ib_user_mad_reg_req ureq;
+ struct ib_mad_reg_req req;
+ struct ib_mad_agent *agent = NULL;
+ int agent_id;
+ int ret;
+
+ mutex_lock(&file->port->file_mutex);
+ mutex_lock(&file->mutex);
+
+ if (!file->port->ib_dev) {
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent: invalid device\n");
+ ret = -EPIPE;
+ goto out;
+ }
+
+ if (copy_from_user(&ureq, arg, sizeof ureq)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (ureq.qpn != 0 && ureq.qpn != 1) {
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent: invalid QPN %d specified\n",
+ ureq.qpn);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
+ if (!__get_agent(file, agent_id))
+ goto found;
+
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent: Max Agents (%u) reached\n",
+ IB_UMAD_MAX_AGENTS);
+ ret = -ENOMEM;
+ goto out;
+
+found:
+ if (ureq.mgmt_class) {
+ memset(&req, 0, sizeof(req));
+ req.mgmt_class = ureq.mgmt_class;
+ req.mgmt_class_version = ureq.mgmt_class_version;
+ memcpy(req.oui, ureq.oui, sizeof req.oui);
+
+ if (compat_method_mask) {
+ u32 *umm = (u32 *) ureq.method_mask;
+ int i;
+
+ for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
+ req.method_mask[i] =
+ umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
+ } else
+ memcpy(req.method_mask, ureq.method_mask,
+ sizeof req.method_mask);
+ }
+
+ 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, 0);
+ if (IS_ERR(agent)) {
+ ret = PTR_ERR(agent);
+ agent = NULL;
+ goto out;
+ }
+
+ if (put_user(agent_id,
+ (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (!file->already_used) {
+ file->already_used = 1;
+ if (!file->use_pkey_index) {
+ dev_warn(file->port->dev,
+ "process %s did not enable P_Key index support.\n",
+ current->comm);
+ dev_warn(file->port->dev,
+ " Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
+ }
+ }
+
+ file->agent[agent_id] = agent;
+ ret = 0;
+
+out:
+ mutex_unlock(&file->mutex);
+
+ if (ret && agent)
+ ib_unregister_mad_agent(agent);
+
+ mutex_unlock(&file->port->file_mutex);
+
+ return ret;
+}
+
+static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
+{
+ struct ib_user_mad_reg_req2 ureq;
+ struct ib_mad_reg_req req;
+ struct ib_mad_agent *agent = NULL;
+ int agent_id;
+ int ret;
+
+ mutex_lock(&file->port->file_mutex);
+ mutex_lock(&file->mutex);
+
+ if (!file->port->ib_dev) {
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent2: invalid device\n");
+ ret = -EPIPE;
+ goto out;
+ }
+
+ if (copy_from_user(&ureq, arg, sizeof(ureq))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (ureq.qpn != 0 && ureq.qpn != 1) {
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent2: invalid QPN %d specified\n",
+ ureq.qpn);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
+ ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
+ ret = -EINVAL;
+
+ if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
+ (u32 __user *) (arg + offsetof(struct
+ ib_user_mad_reg_req2, flags))))
+ ret = -EFAULT;
+
+ goto out;
+ }
+
+ for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
+ if (!__get_agent(file, agent_id))
+ goto found;
+
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent2: Max Agents (%u) reached\n",
+ IB_UMAD_MAX_AGENTS);
+ ret = -ENOMEM;
+ goto out;
+
+found:
+ if (ureq.mgmt_class) {
+ memset(&req, 0, sizeof(req));
+ req.mgmt_class = ureq.mgmt_class;
+ req.mgmt_class_version = ureq.mgmt_class_version;
+ if (ureq.oui & 0xff000000) {
+ dev_notice(file->port->dev,
+ "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
+ ureq.oui);
+ ret = -EINVAL;
+ goto out;
+ }
+ req.oui[2] = ureq.oui & 0x0000ff;
+ req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
+ req.oui[0] = (ureq.oui & 0xff0000) >> 16;
+ memcpy(req.method_mask, ureq.method_mask,
+ sizeof(req.method_mask));
+ }
+
+ 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,
+ ureq.flags);
+ if (IS_ERR(agent)) {
+ ret = PTR_ERR(agent);
+ agent = NULL;
+ goto out;
+ }
+
+ if (put_user(agent_id,
+ (u32 __user *)(arg +
+ offsetof(struct ib_user_mad_reg_req2, id)))) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (!file->already_used) {
+ file->already_used = 1;
+ file->use_pkey_index = 1;
+ }
+
+ file->agent[agent_id] = agent;
+ ret = 0;
+
+out:
+ mutex_unlock(&file->mutex);
+
+ if (ret && agent)
+ ib_unregister_mad_agent(agent);
+
+ mutex_unlock(&file->port->file_mutex);
+
+ return ret;
+}
+
+
+static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
+{
+ struct ib_mad_agent *agent = NULL;
+ u32 id;
+ int ret = 0;
+
+ if (get_user(id, arg))
+ return -EFAULT;
+
+ mutex_lock(&file->port->file_mutex);
+ mutex_lock(&file->mutex);
+
+ if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ agent = file->agent[id];
+ file->agent[id] = NULL;
+
+out:
+ mutex_unlock(&file->mutex);
+
+ if (agent)
+ ib_unregister_mad_agent(agent);
+
+ mutex_unlock(&file->port->file_mutex);
+
+ return ret;
+}
+
+static long ib_umad_enable_pkey(struct ib_umad_file *file)
+{
+ int ret = 0;
+
+ mutex_lock(&file->mutex);
+ if (file->already_used)
+ ret = -EINVAL;
+ else
+ file->use_pkey_index = 1;
+ mutex_unlock(&file->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, (void __user *) arg, 0);
+ case IB_USER_MAD_UNREGISTER_AGENT:
+ return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
+ case IB_USER_MAD_ENABLE_PKEY:
+ return ib_umad_enable_pkey(filp->private_data);
+ case IB_USER_MAD_REGISTER_AGENT2:
+ return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static long ib_umad_compat_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, compat_ptr(arg), 1);
+ case IB_USER_MAD_UNREGISTER_AGENT:
+ return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
+ case IB_USER_MAD_ENABLE_PKEY:
+ return ib_umad_enable_pkey(filp->private_data);
+ case IB_USER_MAD_REGISTER_AGENT2:
+ return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+#endif
+
+/*
+ * ib_umad_open() does not need the BKL:
+ *
+ * - the ib_umad_port structures are properly reference counted, and
+ * everything else is purely local to the file being created, so
+ * races against other open calls are not a problem;
+ * - the ioctl method does not affect any global state outside of the
+ * file structure being operated on;
+ */
+static int ib_umad_open(struct inode *inode, struct file *filp)
+{
+ struct ib_umad_port *port;
+ struct ib_umad_file *file;
+ int ret = -ENXIO;
+
+ port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
+
+ mutex_lock(&port->file_mutex);
+
+ if (!port->ib_dev)
+ goto out;
+
+ ret = -ENOMEM;
+ file = kzalloc(sizeof *file, GFP_KERNEL);
+ if (!file)
+ goto out;
+
+ mutex_init(&file->mutex);
+ 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);
+
+ ret = nonseekable_open(inode, filp);
+ if (ret) {
+ list_del(&file->port_list);
+ kfree(file);
+ goto out;
+ }
+
+ kobject_get(&port->umad_dev->kobj);
+
+out:
+ mutex_unlock(&port->file_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;
+
+ mutex_lock(&file->port->file_mutex);
+ mutex_lock(&file->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);
+
+ mutex_unlock(&file->mutex);
+
+ if (!already_dead)
+ for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
+ if (file->agent[i])
+ ib_unregister_mad_agent(file->agent[i]);
+
+ mutex_unlock(&file->port->file_mutex);
+
+ kfree(file);
+ kobject_put(&dev->kobj);
+
+ 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,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ib_umad_compat_ioctl,
+#endif
+ .open = ib_umad_open,
+ .release = ib_umad_close,
+ .llseek = no_llseek,
+};
+
+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;
+
+ port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
+
+ 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)
+ goto err_up_sem;
+
+ filp->private_data = port;
+
+ ret = nonseekable_open(inode, filp);
+ if (ret)
+ goto err_clr_sm_cap;
+
+ kobject_get(&port->umad_dev->kobj);
+
+ return 0;
+
+err_clr_sm_cap:
+ swap(props.set_port_cap_mask, props.clr_port_cap_mask);
+ ib_modify_port(port->ib_dev, port->port_num, 0, &props);
+
+err_up_sem:
+ up(&port->sm_sem);
+
+fail:
+ 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;
+
+ mutex_lock(&port->file_mutex);
+ if (port->ib_dev)
+ ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
+ mutex_unlock(&port->file_mutex);
+
+ up(&port->sm_sem);
+
+ kobject_put(&port->umad_dev->kobj);
+
+ return ret;
+}
+
+static const struct file_operations umad_sm_fops = {
+ .owner = THIS_MODULE,
+ .open = ib_umad_sm_open,
+ .release = ib_umad_sm_close,
+ .llseek = no_llseek,
+};
+
+static struct ib_client umad_client = {
+ .name = "umad",
+ .add = ib_umad_add_one,
+ .remove = ib_umad_remove_one
+};
+
+static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ib_umad_port *port = dev_get_drvdata(dev);
+
+ if (!port)
+ return -ENODEV;
+
+ return sprintf(buf, "%s\n", port->ib_dev->name);
+}
+static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
+
+static ssize_t show_port(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ib_umad_port *port = dev_get_drvdata(dev);
+
+ if (!port)
+ return -ENODEV;
+
+ return sprintf(buf, "%d\n", port->port_num);
+}
+static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
+
+static CLASS_ATTR_STRING(abi_version, S_IRUGO,
+ __stringify(IB_USER_MAD_ABI_VERSION));
+
+static dev_t overflow_maj;
+static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
+static int find_overflow_devnum(struct ib_device *device)
+{
+ int ret;
+
+ if (!overflow_maj) {
+ ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
+ "infiniband_mad");
+ if (ret) {
+ dev_err(&device->dev,
+ "couldn't register dynamic device number\n");
+ return ret;
+ }
+ }
+
+ ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
+ if (ret >= IB_UMAD_MAX_PORTS)
+ return -1;
+
+ return ret;
+}
+
+static int ib_umad_init_port(struct ib_device *device, int port_num,
+ struct ib_umad_device *umad_dev,
+ struct ib_umad_port *port)
+{
+ int devnum;
+ dev_t base;
+
+ spin_lock(&port_lock);
+ devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
+ if (devnum >= IB_UMAD_MAX_PORTS) {
+ spin_unlock(&port_lock);
+ devnum = find_overflow_devnum(device);
+ if (devnum < 0)
+ return -1;
+
+ spin_lock(&port_lock);
+ port->dev_num = devnum + IB_UMAD_MAX_PORTS;
+ base = devnum + overflow_maj;
+ set_bit(devnum, overflow_map);
+ } else {
+ port->dev_num = devnum;
+ base = devnum + base_dev;
+ set_bit(devnum, dev_map);
+ }
+ spin_unlock(&port_lock);
+
+ port->ib_dev = device;
+ port->port_num = port_num;
+ sema_init(&port->sm_sem, 1);
+ mutex_init(&port->file_mutex);
+ INIT_LIST_HEAD(&port->file_list);
+
+ cdev_init(&port->cdev, &umad_fops);
+ port->cdev.owner = THIS_MODULE;
+ port->cdev.kobj.parent = &umad_dev->kobj;
+ kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
+ if (cdev_add(&port->cdev, base, 1))
+ goto err_cdev;
+
+ port->dev = device_create(umad_class, device->dma_device,
+ port->cdev.dev, port,
+ "umad%d", port->dev_num);
+ if (IS_ERR(port->dev))
+ goto err_cdev;
+
+ if (device_create_file(port->dev, &dev_attr_ibdev))
+ goto err_dev;
+ if (device_create_file(port->dev, &dev_attr_port))
+ goto err_dev;
+
+ base += IB_UMAD_MAX_PORTS;
+ cdev_init(&port->sm_cdev, &umad_sm_fops);
+ port->sm_cdev.owner = THIS_MODULE;
+ port->sm_cdev.kobj.parent = &umad_dev->kobj;
+ kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
+ if (cdev_add(&port->sm_cdev, base, 1))
+ goto err_sm_cdev;
+
+ port->sm_dev = device_create(umad_class, device->dma_device,
+ port->sm_cdev.dev, port,
+ "issm%d", port->dev_num);
+ if (IS_ERR(port->sm_dev))
+ goto err_sm_cdev;
+
+ if (device_create_file(port->sm_dev, &dev_attr_ibdev))
+ goto err_sm_dev;
+ if (device_create_file(port->sm_dev, &dev_attr_port))
+ goto err_sm_dev;
+
+ return 0;
+
+err_sm_dev:
+ device_destroy(umad_class, port->sm_cdev.dev);
+
+err_sm_cdev:
+ cdev_del(&port->sm_cdev);
+
+err_dev:
+ device_destroy(umad_class, port->cdev.dev);
+
+err_cdev:
+ cdev_del(&port->cdev);
+ if (port->dev_num < IB_UMAD_MAX_PORTS)
+ clear_bit(devnum, dev_map);
+ else
+ clear_bit(devnum, overflow_map);
+
+ return -1;
+}
+
+static void ib_umad_kill_port(struct ib_umad_port *port)
+{
+ struct ib_umad_file *file;
+ int id;
+
+ dev_set_drvdata(port->dev, NULL);
+ dev_set_drvdata(port->sm_dev, NULL);
+
+ device_destroy(umad_class, port->cdev.dev);
+ device_destroy(umad_class, port->sm_cdev.dev);
+
+ cdev_del(&port->cdev);
+ cdev_del(&port->sm_cdev);
+
+ mutex_lock(&port->file_mutex);
+
+ port->ib_dev = NULL;
+
+ list_for_each_entry(file, &port->file_list, port_list) {
+ mutex_lock(&file->mutex);
+ file->agents_dead = 1;
+ mutex_unlock(&file->mutex);
+
+ for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
+ if (file->agent[id])
+ ib_unregister_mad_agent(file->agent[id]);
+ }
+
+ mutex_unlock(&port->file_mutex);
+
+ if (port->dev_num < IB_UMAD_MAX_PORTS)
+ clear_bit(port->dev_num, dev_map);
+ else
+ clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_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;
+
+ kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
+
+ 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,
+ &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]);
+
+ kobject_put(&umad_dev->kobj);
+}
+
+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]);
+
+ kobject_put(&umad_dev->kobj);
+}
+
+static char *umad_devnode(struct device *dev, umode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(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) {
+ pr_err("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);
+ pr_err("couldn't create class infiniband_mad\n");
+ goto out_chrdev;
+ }
+
+ umad_class->devnode = umad_devnode;
+
+ ret = class_create_file(umad_class, &class_attr_abi_version.attr);
+ if (ret) {
+ pr_err("couldn't create abi_version attribute\n");
+ goto out_class;
+ }
+
+ ret = ib_register_client(&umad_client);
+ if (ret) {
+ pr_err("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);
+ if (overflow_maj)
+ unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
+}
+
+module_init(ib_umad_init);
+module_exit(ib_umad_cleanup);
Code Review / kvmfornfv.git / blobdiff