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kernel-ark/drivers/infiniband/core/ucma.c
Sean Hefty 0cefcf0bbc RDMA/ucma: Don't report events with invalid user context 
There's a problem with how rdma cm events are reported to userspace
that can lead to application crashes.

When a new connection request arrives, a context for the connection is
allocated in the kernel.  The connection event is then reported to
userspace.  The userspace library retrieves the event and allocates
its own context for the connection.  The userspace context is
associated with the kernel's context when accepting.  This allows the
kernel to give userspace context with other events.

A problem occurs if a second event for the same connection occurs
before the user has had a chance to call accept.  The userspace
context has not yet been set, which causes the librdmacm to crash.
(This has been seen when the app takes too long to call accept,
resulting in the remote side timing out and rejecting the connection)

Fix this by ignoring events for new connections until userspace has
set their context.  This can only happen if an error occurs on a new
connection before the user accepts it.  This is okay, since the accept
will just fail later.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2007-01-07 20:20:08 -08:00

886 lines
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/*
* Copyright (c) 2005-2006 Intel Corporation. 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.
*/
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/idr.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/miscdevice.h>
#include <rdma/rdma_user_cm.h>
#include <rdma/ib_marshall.h>
#include <rdma/rdma_cm.h>
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
MODULE_LICENSE("Dual BSD/GPL");
enum {
UCMA_MAX_BACKLOG = 128
};
struct ucma_file {
struct mutex mut;
struct file *filp;
struct list_head ctx_list;
struct list_head event_list;
wait_queue_head_t poll_wait;
};
struct ucma_context {
int id;
struct completion comp;
atomic_t ref;
int events_reported;
int backlog;
struct ucma_file *file;
struct rdma_cm_id *cm_id;
u64 uid;
struct list_head list;
};
struct ucma_event {
struct ucma_context *ctx;
struct list_head list;
struct rdma_cm_id *cm_id;
struct rdma_ucm_event_resp resp;
};
static DEFINE_MUTEX(mut);
static DEFINE_IDR(ctx_idr);
static inline struct ucma_context *_ucma_find_context(int id,
struct ucma_file *file)
{
struct ucma_context *ctx;
ctx = idr_find(&ctx_idr, id);
if (!ctx)
ctx = ERR_PTR(-ENOENT);
else if (ctx->file != file)
ctx = ERR_PTR(-EINVAL);
return ctx;
}
static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
{
struct ucma_context *ctx;
mutex_lock(&mut);
ctx = _ucma_find_context(id, file);
if (!IS_ERR(ctx))
atomic_inc(&ctx->ref);
mutex_unlock(&mut);
return ctx;
}
static void ucma_put_ctx(struct ucma_context *ctx)
{
if (atomic_dec_and_test(&ctx->ref))
complete(&ctx->comp);
}
static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
{
struct ucma_context *ctx;
int ret;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;
atomic_set(&ctx->ref, 1);
init_completion(&ctx->comp);
ctx->file = file;
do {
ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
if (!ret)
goto error;
mutex_lock(&mut);
ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
mutex_unlock(&mut);
} while (ret == -EAGAIN);
if (ret)
goto error;
list_add_tail(&ctx->list, &file->ctx_list);
return ctx;
error:
kfree(ctx);
return NULL;
}
static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
struct rdma_conn_param *src)
{
if (src->private_data_len)
memcpy(dst->private_data, src->private_data,
src->private_data_len);
dst->private_data_len = src->private_data_len;
dst->responder_resources =src->responder_resources;
dst->initiator_depth = src->initiator_depth;
dst->flow_control = src->flow_control;
dst->retry_count = src->retry_count;
dst->rnr_retry_count = src->rnr_retry_count;
dst->srq = src->srq;
dst->qp_num = src->qp_num;
}
static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
struct rdma_ud_param *src)
{
if (src->private_data_len)
memcpy(dst->private_data, src->private_data,
src->private_data_len);
dst->private_data_len = src->private_data_len;
ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
dst->qp_num = src->qp_num;
dst->qkey = src->qkey;
}
static void ucma_set_event_context(struct ucma_context *ctx,
struct rdma_cm_event *event,
struct ucma_event *uevent)
{
uevent->ctx = ctx;
uevent->resp.uid = ctx->uid;
uevent->resp.id = ctx->id;
}
static int ucma_event_handler(struct rdma_cm_id *cm_id,
struct rdma_cm_event *event)
{
struct ucma_event *uevent;
struct ucma_context *ctx = cm_id->context;
int ret = 0;
uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
if (!uevent)
return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
uevent->cm_id = cm_id;
ucma_set_event_context(ctx, event, uevent);
uevent->resp.event = event->event;
uevent->resp.status = event->status;
if (cm_id->ps == RDMA_PS_UDP)
ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
else
ucma_copy_conn_event(&uevent->resp.param.conn,
&event->param.conn);
mutex_lock(&ctx->file->mut);
if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
if (!ctx->backlog) {
ret = -EDQUOT;
kfree(uevent);
goto out;
}
ctx->backlog--;
} else if (!ctx->uid) {
/*
* We ignore events for new connections until userspace has set
* their context. This can only happen if an error occurs on a
* new connection before the user accepts it. This is okay,
* since the accept will just fail later.
*/
kfree(uevent);
goto out;
}
list_add_tail(&uevent->list, &ctx->file->event_list);
wake_up_interruptible(&ctx->file->poll_wait);
out:
mutex_unlock(&ctx->file->mut);
return ret;
}
static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct ucma_context *ctx;
struct rdma_ucm_get_event cmd;
struct ucma_event *uevent;
int ret = 0;
DEFINE_WAIT(wait);
if (out_len < sizeof uevent->resp)
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&file->mut);
while (list_empty(&file->event_list)) {
if (file->filp->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
break;
}
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE);
mutex_unlock(&file->mut);
schedule();
mutex_lock(&file->mut);
finish_wait(&file->poll_wait, &wait);
}
if (ret)
goto done;
uevent = list_entry(file->event_list.next, struct ucma_event, list);
if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
ctx = ucma_alloc_ctx(file);
if (!ctx) {
ret = -ENOMEM;
goto done;
}
uevent->ctx->backlog++;
ctx->cm_id = uevent->cm_id;
ctx->cm_id->context = ctx;
uevent->resp.id = ctx->id;
}
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&uevent->resp, sizeof uevent->resp)) {
ret = -EFAULT;
goto done;
}
list_del(&uevent->list);
uevent->ctx->events_reported++;
kfree(uevent);
done:
mutex_unlock(&file->mut);
return ret;
}
static ssize_t ucma_create_id(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_create_id cmd;
struct rdma_ucm_create_id_resp resp;
struct ucma_context *ctx;
int ret;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&file->mut);
ctx = ucma_alloc_ctx(file);
mutex_unlock(&file->mut);
if (!ctx)
return -ENOMEM;
ctx->uid = cmd.uid;
ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
if (IS_ERR(ctx->cm_id)) {
ret = PTR_ERR(ctx->cm_id);
goto err1;
}
resp.id = ctx->id;
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp))) {
ret = -EFAULT;
goto err2;
}
return 0;
err2:
rdma_destroy_id(ctx->cm_id);
err1:
mutex_lock(&mut);
idr_remove(&ctx_idr, ctx->id);
mutex_unlock(&mut);
kfree(ctx);
return ret;
}
static void ucma_cleanup_events(struct ucma_context *ctx)
{
struct ucma_event *uevent, *tmp;
list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
if (uevent->ctx != ctx)
continue;
list_del(&uevent->list);
/* clear incoming connections. */
if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
rdma_destroy_id(uevent->cm_id);
kfree(uevent);
}
}
static int ucma_free_ctx(struct ucma_context *ctx)
{
int events_reported;
/* No new events will be generated after destroying the id. */
rdma_destroy_id(ctx->cm_id);
/* Cleanup events not yet reported to the user. */
mutex_lock(&ctx->file->mut);
ucma_cleanup_events(ctx);
list_del(&ctx->list);
mutex_unlock(&ctx->file->mut);
events_reported = ctx->events_reported;
kfree(ctx);
return events_reported;
}
static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_destroy_id cmd;
struct rdma_ucm_destroy_id_resp resp;
struct ucma_context *ctx;
int ret = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&mut);
ctx = _ucma_find_context(cmd.id, file);
if (!IS_ERR(ctx))
idr_remove(&ctx_idr, ctx->id);
mutex_unlock(&mut);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ucma_put_ctx(ctx);
wait_for_completion(&ctx->comp);
resp.events_reported = ucma_free_ctx(ctx);
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp)))
ret = -EFAULT;
return ret;
}
static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_bind_addr cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_resolve_addr(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_resolve_addr cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
(struct sockaddr *) &cmd.dst_addr,
cmd.timeout_ms);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_resolve_route(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_resolve_route cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
ucma_put_ctx(ctx);
return ret;
}
static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
struct rdma_route *route)
{
struct rdma_dev_addr *dev_addr;
resp->num_paths = route->num_paths;
switch (route->num_paths) {
case 0:
dev_addr = &route->addr.dev_addr;
ib_addr_get_dgid(dev_addr,
(union ib_gid *) &resp->ib_route[0].dgid);
ib_addr_get_sgid(dev_addr,
(union ib_gid *) &resp->ib_route[0].sgid);
resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
break;
case 2:
ib_copy_path_rec_to_user(&resp->ib_route[1],
&route->path_rec[1]);
/* fall through */
case 1:
ib_copy_path_rec_to_user(&resp->ib_route[0],
&route->path_rec[0]);
break;
default:
break;
}
}
static ssize_t ucma_query_route(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_query_route cmd;
struct rdma_ucm_query_route_resp resp;
struct ucma_context *ctx;
struct sockaddr *addr;
int ret = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
memset(&resp, 0, sizeof resp);
addr = &ctx->cm_id->route.addr.src_addr;
memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
sizeof(struct sockaddr_in) :
sizeof(struct sockaddr_in6));
addr = &ctx->cm_id->route.addr.dst_addr;
memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
sizeof(struct sockaddr_in) :
sizeof(struct sockaddr_in6));
if (!ctx->cm_id->device)
goto out;
resp.node_guid = ctx->cm_id->device->node_guid;
resp.port_num = ctx->cm_id->port_num;
switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
case RDMA_TRANSPORT_IB:
ucma_copy_ib_route(&resp, &ctx->cm_id->route);
break;
default:
break;
}
out:
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp)))
ret = -EFAULT;
ucma_put_ctx(ctx);
return ret;
}
static void ucma_copy_conn_param(struct rdma_conn_param *dst,
struct rdma_ucm_conn_param *src)
{
dst->private_data = src->private_data;
dst->private_data_len = src->private_data_len;
dst->responder_resources =src->responder_resources;
dst->initiator_depth = src->initiator_depth;
dst->flow_control = src->flow_control;
dst->retry_count = src->retry_count;
dst->rnr_retry_count = src->rnr_retry_count;
dst->srq = src->srq;
dst->qp_num = src->qp_num;
}
static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_connect cmd;
struct rdma_conn_param conn_param;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
if (!cmd.conn_param.valid)
return -EINVAL;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ucma_copy_conn_param(&conn_param, &cmd.conn_param);
ret = rdma_connect(ctx->cm_id, &conn_param);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_listen cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
cmd.backlog : UCMA_MAX_BACKLOG;
ret = rdma_listen(ctx->cm_id, ctx->backlog);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_accept cmd;
struct rdma_conn_param conn_param;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
if (cmd.conn_param.valid) {
ctx->uid = cmd.uid;
ucma_copy_conn_param(&conn_param, &cmd.conn_param);
ret = rdma_accept(ctx->cm_id, &conn_param);
} else
ret = rdma_accept(ctx->cm_id, NULL);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_reject cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_disconnect cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = rdma_disconnect(ctx->cm_id);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_init_qp_attr(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_init_qp_attr cmd;
struct ib_uverbs_qp_attr resp;
struct ucma_context *ctx;
struct ib_qp_attr qp_attr;
int ret;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
resp.qp_attr_mask = 0;
memset(&qp_attr, 0, sizeof qp_attr);
qp_attr.qp_state = cmd.qp_state;
ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
if (ret)
goto out;
ib_copy_qp_attr_to_user(&resp, &qp_attr);
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp)))
ret = -EFAULT;
out:
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_notify cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len) = {
[RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
[RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
[RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
[RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
[RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
[RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
[RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
[RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
[RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
[RDMA_USER_CM_CMD_REJECT] = ucma_reject,
[RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
[RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
[RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
[RDMA_USER_CM_CMD_GET_OPTION] = NULL,
[RDMA_USER_CM_CMD_SET_OPTION] = NULL,
[RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
};
static ssize_t ucma_write(struct file *filp, const char __user *buf,
size_t len, loff_t *pos)
{
struct ucma_file *file = filp->private_data;
struct rdma_ucm_cmd_hdr hdr;
ssize_t ret;
if (len < sizeof(hdr))
return -EINVAL;
if (copy_from_user(&hdr, buf, sizeof(hdr)))
return -EFAULT;
if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
return -EINVAL;
if (hdr.in + sizeof(hdr) > len)
return -EINVAL;
if (!ucma_cmd_table[hdr.cmd])
return -ENOSYS;
ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
if (!ret)
ret = len;
return ret;
}
static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
{
struct ucma_file *file = filp->private_data;
unsigned int mask = 0;
poll_wait(filp, &file->poll_wait, wait);
if (!list_empty(&file->event_list))
mask = POLLIN | POLLRDNORM;
return mask;
}
static int ucma_open(struct inode *inode, struct file *filp)
{
struct ucma_file *file;
file = kmalloc(sizeof *file, GFP_KERNEL);
if (!file)
return -ENOMEM;
INIT_LIST_HEAD(&file->event_list);
INIT_LIST_HEAD(&file->ctx_list);
init_waitqueue_head(&file->poll_wait);
mutex_init(&file->mut);
filp->private_data = file;
file->filp = filp;
return 0;
}
static int ucma_close(struct inode *inode, struct file *filp)
{
struct ucma_file *file = filp->private_data;
struct ucma_context *ctx, *tmp;
mutex_lock(&file->mut);
list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
mutex_unlock(&file->mut);
mutex_lock(&mut);
idr_remove(&ctx_idr, ctx->id);
mutex_unlock(&mut);
ucma_free_ctx(ctx);
mutex_lock(&file->mut);
}
mutex_unlock(&file->mut);
kfree(file);
return 0;
}
static struct file_operations ucma_fops = {
.owner = THIS_MODULE,
.open = ucma_open,
.release = ucma_close,
.write = ucma_write,
.poll = ucma_poll,
};
static struct miscdevice ucma_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "rdma_cm",
.fops = &ucma_fops,
};
static ssize_t show_abi_version(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
}
static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
static int __init ucma_init(void)
{
int ret;
ret = misc_register(&ucma_misc);
if (ret)
return ret;
ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
if (ret) {
printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
goto err;
}
return 0;
err:
misc_deregister(&ucma_misc);
return ret;
}
static void __exit ucma_cleanup(void)
{
device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
misc_deregister(&ucma_misc);
idr_destroy(&ctx_idr);
}
module_init(ucma_init);
module_exit(ucma_cleanup);
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