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linux/drivers/infiniband/core/user_mad.c
Hal Rosenstock 618a3c03fc IB/mad: RMPP support for additional classes 
Add RMPP support for additional management classes that support it.
Also, validate RMPP is consistent with management class specified.

Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2006-03-30 07:19:51 -08:00

1070 lines
26 KiB
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/*
* 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/pci.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 port_list;
spinlock_t recv_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 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];
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 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;
u8 method;
__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;
}
/*
* If userspace is generating a request that will generate a
* response, we need to make sure the high-order part of the
* transaction ID matches the agent being used to send the
* MAD.
*/
method = ((struct ib_mad_hdr *) packet->msg->mad)->method;
if (!(method & IB_MGMT_METHOD_RESP) &&
method != IB_MGMT_METHOD_TRAP_REPRESS &&
method != IB_MGMT_METHOD_SEND) {
tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
*tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
(be64_to_cpup(tid) & 0xffffffff));
}
ret = ib_post_send_mad(packet->msg, NULL);
if (ret)
goto err_msg;
up_read(&file->port->mutex);
return count;
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);
INIT_LIST_HEAD(&file->recv_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 (device->node_type == IB_NODE_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);
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