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linux-zen-server/drivers/infiniband/core/user_mad.c

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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.
* 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 <linux/nospec.h>
#include <linux/uaccess.h>
#include <rdma/ib_mad.h>
#include <rdma/ib_user_mad.h>
#include <rdma/rdma_netlink.h>
#include "core_priv.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
MODULE_LICENSE("Dual BSD/GPL");
enum {
IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS,
IB_UMAD_MAX_AGENTS = 32,
IB_UMAD_MAJOR = 231,
IB_UMAD_MINOR_BASE = 0,
IB_UMAD_NUM_FIXED_MINOR = 64,
IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR,
};
/*
* 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;
u32 port_num;
};
struct ib_umad_device {
struct kref kref;
struct ib_umad_port ports[];
};
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;
};
struct ib_rmpp_mad_hdr {
struct ib_mad_hdr mad_hdr;
struct ib_rmpp_hdr rmpp_hdr;
} __packed;
#define CREATE_TRACE_POINTS
#include <trace/events/ib_umad.h>
static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
IB_UMAD_NUM_FIXED_MINOR;
static dev_t dynamic_umad_dev;
static dev_t dynamic_issm_dev;
static DEFINE_IDA(umad_ida);
static int ib_umad_add_one(struct ib_device *device);
static void ib_umad_remove_one(struct ib_device *device, void *client_data);
static void ib_umad_dev_free(struct kref *kref)
{
struct ib_umad_device *dev =
container_of(kref, struct ib_umad_device, kref);
kfree(dev);
}
static void ib_umad_dev_get(struct ib_umad_device *dev)
{
kref_get(&dev->kref);
}
static void ib_umad_dev_put(struct ib_umad_device *dev)
{
kref_put(&dev->kref, ib_umad_dev_free);
}
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);
rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
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_send_buf *send_buf,
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);
/*
* On OPA devices it is okay to lose the upper 16 bits of LID as this
* information is obtained elsewhere. Mask off the upper 16 bits.
*/
if (rdma_cap_opa_mad(agent->device, agent->port_num))
packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
mad_recv_wc->wc->slid);
else
packet->mad.hdr.lid = ib_lid_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 rdma_ah_attr ah_attr;
const struct ib_global_route *grh;
int ret;
ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
mad_recv_wc->wc,
mad_recv_wc->recv_buf.grh,
&ah_attr);
if (ret)
goto err2;
grh = rdma_ah_read_grh(&ah_attr);
packet->mad.hdr.gid_index = grh->sgid_index;
packet->mad.hdr.hop_limit = grh->hop_limit;
packet->mad.hdr.traffic_class = grh->traffic_class;
memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
rdma_destroy_ah_attr(&ah_attr);
}
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;
size_t seg_size;
recv_buf = &packet->recv_wc->recv_buf;
seg_size = packet->recv_wc->mad_seg_size;
/* We need enough room to copy the first (or only) MAD segment. */
if ((packet->length <= seg_size &&
count < hdr_size(file) + packet->length) ||
(packet->length > seg_size &&
count < hdr_size(file) + seg_size))
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, seg_size);
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 = seg_size - 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;
}
}
trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
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;
trace_ib_umad_read_send(file, &packet->mad.hdr,
(struct ib_mad_hdr *)&packet->mad.data);
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);
if (file->agents_dead) {
mutex_unlock(&file->mutex);
return -EIO;
}
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);
}
if (file->agents_dead) {
mutex_unlock(&file->mutex);
return -EIO;
}
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(hdr)) {
if (!ib_response_mad(sent_hdr))
return 1;
continue;
} else if (!ib_response_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_rmpp_mad_hdr *rmpp_mad_hdr;
struct ib_umad_packet *packet;
struct ib_mad_agent *agent;
struct rdma_ah_attr ah_attr;
struct ib_ah *ah;
__be64 *tid;
int ret, data_len, hdr_len, copy_offset, rmpp_active;
u8 base_version;
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);
trace_ib_umad_write(file, &packet->mad.hdr,
(struct ib_mad_hdr *)&packet->mad.data);
agent = __get_agent(file, packet->mad.hdr.id);
if (!agent) {
ret = -EIO;
goto err_up;
}
memset(&ah_attr, 0, sizeof ah_attr);
ah_attr.type = rdma_ah_find_type(agent->device,
file->port->port_num);
rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
rdma_ah_set_port_num(&ah_attr, file->port->port_num);
if (packet->mad.hdr.grh_present) {
rdma_ah_set_grh(&ah_attr, NULL,
be32_to_cpu(packet->mad.hdr.flow_label),
packet->mad.hdr.gid_index,
packet->mad.hdr.hop_limit,
packet->mad.hdr.traffic_class);
rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
}
ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
if (IS_ERR(ah)) {
ret = PTR_ERR(ah);
goto err_up;
}
rmpp_mad_hdr = (struct ib_rmpp_mad_hdr *)packet->mad.data;
hdr_len = ib_get_mad_data_offset(rmpp_mad_hdr->mad_hdr.mgmt_class);
if (ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)
&& ib_mad_kernel_rmpp_agent(agent)) {
copy_offset = IB_MGMT_RMPP_HDR;
rmpp_active = ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) &
IB_MGMT_RMPP_FLAG_ACTIVE;
} else {
copy_offset = IB_MGMT_MAD_HDR;
rmpp_active = 0;
}
base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
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,
base_version);
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_hdr->mad_hdr.tid = *tid;
}
if (!ib_mad_kernel_rmpp_agent(agent)
&& ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)
&& (ib_get_rmpp_flags(&rmpp_mad_hdr->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:
rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
err_up:
mutex_unlock(&file->mutex);
err:
kfree(packet);
return ret;
}
static __poll_t 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 */
__poll_t mask = EPOLLOUT | EPOLLWRNORM;
mutex_lock(&file->mutex);
poll_wait(filp, &file->recv_wait, wait);
if (!list_empty(&file->recv_list))
mask |= EPOLLIN | EPOLLRDNORM;
if (file->agents_dead)
mask = EPOLLERR;
mutex_unlock(&file->mutex);
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, "%s: invalid device\n", __func__);
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,
"%s: invalid QPN %u specified\n", __func__,
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, "%s: Max Agents (%u) reached\n", __func__,
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.rst 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, "%s: invalid device\n", __func__);
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, "%s: invalid QPN %u specified\n",
__func__, ureq.qpn);
ret = -EINVAL;
goto out;
}
if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
dev_notice(&file->port->dev,
"%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",
__func__, 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, "%s: Max Agents (%u) reached\n", __func__,
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,
"%s failed: oui invalid 0x%08x\n", __func__,
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;
if (id >= IB_UMAD_MAX_AGENTS)
return -EINVAL;
mutex_lock(&file->port->file_mutex);
mutex_lock(&file->mutex);
id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
if (!__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 = 0;
port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
mutex_lock(&port->file_mutex);
if (!port->ib_dev) {
ret = -ENXIO;
goto out;
}
if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
ret = -EPERM;
goto out;
}
file = kzalloc(sizeof(*file), GFP_KERNEL);
if (!file) {
ret = -ENOMEM;
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);
stream_open(inode, filp);
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_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);
mutex_destroy(&file->mutex);
kfree(file);
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;
}
}
if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
ret = -EPERM;
goto err_up_sem;
}
ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
if (ret)
goto err_up_sem;
filp->private_data = port;
nonseekable_open(inode, filp);
return 0;
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);
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_umad_port *get_port(struct ib_device *ibdev,
struct ib_umad_device *umad_dev,
u32 port)
{
if (!umad_dev)
return ERR_PTR(-EOPNOTSUPP);
if (!rdma_is_port_valid(ibdev, port))
return ERR_PTR(-EINVAL);
if (!rdma_cap_ib_mad(ibdev, port))
return ERR_PTR(-EOPNOTSUPP);
return &umad_dev->ports[port - rdma_start_port(ibdev)];
}
static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
struct ib_client_nl_info *res)
{
struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
if (IS_ERR(port))
return PTR_ERR(port);
res->abi = IB_USER_MAD_ABI_VERSION;
res->cdev = &port->dev;
return 0;
}
static struct ib_client umad_client = {
.name = "umad",
.add = ib_umad_add_one,
.remove = ib_umad_remove_one,
.get_nl_info = ib_umad_get_nl_info,
};
MODULE_ALIAS_RDMA_CLIENT("umad");
static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
struct ib_client_nl_info *res)
{
struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
if (IS_ERR(port))
return PTR_ERR(port);
res->abi = IB_USER_MAD_ABI_VERSION;
res->cdev = &port->sm_dev;
return 0;
}
static struct ib_client issm_client = {
.name = "issm",
.get_nl_info = ib_issm_get_nl_info,
};
MODULE_ALIAS_RDMA_CLIENT("issm");
static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ib_umad_port *port = dev_get_drvdata(dev);
if (!port)
return -ENODEV;
return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev));
}
static DEVICE_ATTR_RO(ibdev);
static ssize_t port_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ib_umad_port *port = dev_get_drvdata(dev);
if (!port)
return -ENODEV;
return sysfs_emit(buf, "%d\n", port->port_num);
}
static DEVICE_ATTR_RO(port);
static struct attribute *umad_class_dev_attrs[] = {
&dev_attr_ibdev.attr,
&dev_attr_port.attr,
NULL,
};
ATTRIBUTE_GROUPS(umad_class_dev);
static char *umad_devnode(const struct device *dev, umode_t *mode)
{
return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
}
static ssize_t abi_version_show(struct class *class,
struct class_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
}
static CLASS_ATTR_RO(abi_version);
static struct attribute *umad_class_attrs[] = {
&class_attr_abi_version.attr,
NULL,
};
ATTRIBUTE_GROUPS(umad_class);
static struct class umad_class = {
.name = "infiniband_mad",
.devnode = umad_devnode,
.class_groups = umad_class_groups,
.dev_groups = umad_class_dev_groups,
};
static void ib_umad_release_port(struct device *device)
{
struct ib_umad_port *port = dev_get_drvdata(device);
struct ib_umad_device *umad_dev = port->umad_dev;
ib_umad_dev_put(umad_dev);
}
static void ib_umad_init_port_dev(struct device *dev,
struct ib_umad_port *port,
const struct ib_device *device)
{
device_initialize(dev);
ib_umad_dev_get(port->umad_dev);
dev->class = &umad_class;
dev->parent = device->dev.parent;
dev_set_drvdata(dev, port);
dev->release = ib_umad_release_port;
}
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_umad;
dev_t base_issm;
int ret;
devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
if (devnum < 0)
return -1;
port->dev_num = devnum;
if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
} else {
base_umad = devnum + base_umad_dev;
base_issm = devnum + base_issm_dev;
}
port->ib_dev = device;
port->umad_dev = umad_dev;
port->port_num = port_num;
sema_init(&port->sm_sem, 1);
mutex_init(&port->file_mutex);
INIT_LIST_HEAD(&port->file_list);
ib_umad_init_port_dev(&port->dev, port, device);
port->dev.devt = base_umad;
dev_set_name(&port->dev, "umad%d", port->dev_num);
cdev_init(&port->cdev, &umad_fops);
port->cdev.owner = THIS_MODULE;
ret = cdev_device_add(&port->cdev, &port->dev);
if (ret)
goto err_cdev;
ib_umad_init_port_dev(&port->sm_dev, port, device);
port->sm_dev.devt = base_issm;
dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
cdev_init(&port->sm_cdev, &umad_sm_fops);
port->sm_cdev.owner = THIS_MODULE;
ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
if (ret)
goto err_dev;
return 0;
err_dev:
put_device(&port->sm_dev);
cdev_device_del(&port->cdev, &port->dev);
err_cdev:
put_device(&port->dev);
ida_free(&umad_ida, devnum);
return ret;
}
static void ib_umad_kill_port(struct ib_umad_port *port)
{
struct ib_umad_file *file;
int id;
cdev_device_del(&port->sm_cdev, &port->sm_dev);
cdev_device_del(&port->cdev, &port->dev);
mutex_lock(&port->file_mutex);
/* Mark ib_dev NULL and block ioctl or other file ops to progress
* further.
*/
port->ib_dev = NULL;
list_for_each_entry(file, &port->file_list, port_list) {
mutex_lock(&file->mutex);
file->agents_dead = 1;
wake_up_interruptible(&file->recv_wait);
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);
ida_free(&umad_ida, port->dev_num);
/* balances device_initialize() */
put_device(&port->sm_dev);
put_device(&port->dev);
}
static int ib_umad_add_one(struct ib_device *device)
{
struct ib_umad_device *umad_dev;
int s, e, i;
int count = 0;
int ret;
s = rdma_start_port(device);
e = rdma_end_port(device);
umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
if (!umad_dev)
return -ENOMEM;
kref_init(&umad_dev->kref);
for (i = s; i <= e; ++i) {
if (!rdma_cap_ib_mad(device, i))
continue;
ret = ib_umad_init_port(device, i, umad_dev,
&umad_dev->ports[i - s]);
if (ret)
goto err;
count++;
}
if (!count) {
ret = -EOPNOTSUPP;
goto free;
}
ib_set_client_data(device, &umad_client, umad_dev);
return 0;
err:
while (--i >= s) {
if (!rdma_cap_ib_mad(device, i))
continue;
ib_umad_kill_port(&umad_dev->ports[i - s]);
}
free:
/* balances kref_init */
ib_umad_dev_put(umad_dev);
return ret;
}
static void ib_umad_remove_one(struct ib_device *device, void *client_data)
{
struct ib_umad_device *umad_dev = client_data;
unsigned int i;
rdma_for_each_port (device, i) {
if (rdma_cap_ib_mad(device, i))
ib_umad_kill_port(
&umad_dev->ports[i - rdma_start_port(device)]);
}
/* balances kref_init() */
ib_umad_dev_put(umad_dev);
}
static int __init ib_umad_init(void)
{
int ret;
ret = register_chrdev_region(base_umad_dev,
IB_UMAD_NUM_FIXED_MINOR * 2,
umad_class.name);
if (ret) {
pr_err("couldn't register device number\n");
goto out;
}
ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
IB_UMAD_NUM_DYNAMIC_MINOR * 2,
umad_class.name);
if (ret) {
pr_err("couldn't register dynamic device number\n");
goto out_alloc;
}
dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
ret = class_register(&umad_class);
if (ret) {
pr_err("couldn't create class infiniband_mad\n");
goto out_chrdev;
}
ret = ib_register_client(&umad_client);
if (ret)
goto out_class;
ret = ib_register_client(&issm_client);
if (ret)
goto out_client;
return 0;
out_client:
ib_unregister_client(&umad_client);
out_class:
class_unregister(&umad_class);
out_chrdev:
unregister_chrdev_region(dynamic_umad_dev,
IB_UMAD_NUM_DYNAMIC_MINOR * 2);
out_alloc:
unregister_chrdev_region(base_umad_dev,
IB_UMAD_NUM_FIXED_MINOR * 2);
out:
return ret;
}
static void __exit ib_umad_cleanup(void)
{
ib_unregister_client(&issm_client);
ib_unregister_client(&umad_client);
class_unregister(&umad_class);
unregister_chrdev_region(base_umad_dev,
IB_UMAD_NUM_FIXED_MINOR * 2);
unregister_chrdev_region(dynamic_umad_dev,
IB_UMAD_NUM_DYNAMIC_MINOR * 2);
}
module_init(ib_umad_init);
module_exit(ib_umad_cleanup);
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