/*
* 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/file.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/idr.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/nsproxy.h>
#include <linux/nospec.h>
#include <rdma/rdma_user_cm.h>
#include <rdma/ib_marshall.h>
#include <rdma/rdma_cm.h>
#include <rdma/rdma_cm_ib.h>
#include <rdma/ib_addr.h>
#include <rdma/ib.h>
#include <rdma/ib_cm.h>
#include <rdma/rdma_netlink.h>
#include "core_priv.h"
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
MODULE_LICENSE("Dual BSD/GPL");
static unsigned int max_backlog = 1024;
static struct ctl_table_header *ucma_ctl_table_hdr;
static struct ctl_table ucma_ctl_table[] = {
{
.procname = "max_backlog",
.data = &max_backlog,
.maxlen = sizeof max_backlog,
.mode = 0644,
.proc_handler = proc_dointvec,
},
};
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 {
u32 id;
struct completion comp;
refcount_t ref;
int events_reported;
atomic_t backlog;
struct ucma_file *file;
struct rdma_cm_id *cm_id;
struct mutex mutex;
u64 uid;
struct list_head list;
struct list_head mc_list;
struct work_struct close_work;
};
struct ucma_multicast {
struct ucma_context *ctx;
u32 id;
int events_reported;
u64 uid;
u8 join_state;
struct list_head list;
struct sockaddr_storage addr;
};
struct ucma_event {
struct ucma_context *ctx;
struct ucma_context *conn_req_ctx;
struct ucma_multicast *mc;
struct list_head list;
struct rdma_ucm_event_resp resp;
};
static DEFINE_XARRAY_ALLOC(ctx_table);
static DEFINE_XARRAY_ALLOC(multicast_table);
static const struct file_operations ucma_fops;
static int ucma_destroy_private_ctx(struct ucma_context *ctx);
static inline struct ucma_context *_ucma_find_context(int id,
struct ucma_file *file)
{
struct ucma_context *ctx;
ctx = xa_load(&ctx_table, 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;
xa_lock(&ctx_table);
ctx = _ucma_find_context(id, file);
if (!IS_ERR(ctx))
if (!refcount_inc_not_zero(&ctx->ref))
ctx = ERR_PTR(-ENXIO);
xa_unlock(&ctx_table);
return ctx;
}
static void ucma_put_ctx(struct ucma_context *ctx)
{
if (refcount_dec_and_test(&ctx->ref))
complete(&ctx->comp);
}
/*
* Same as ucm_get_ctx but requires that ->cm_id->device is valid, eg that the
* CM_ID is bound.
*/
static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id)
{
struct ucma_context *ctx = ucma_get_ctx(file, id);
if (IS_ERR(ctx))
return ctx;
if (!ctx->cm_id->device) {
ucma_put_ctx(ctx);
return ERR_PTR(-EINVAL);
}
return ctx;
}
static void ucma_close_id(struct work_struct *work)
{
struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
/* once all inflight tasks are finished, we close all underlying
* resources. The context is still alive till its explicit destryoing
* by its creator. This puts back the xarray's reference.
*/
ucma_put_ctx(ctx);
wait_for_completion(&ctx->comp);
/* No new events will be generated after destroying the id. */
rdma_destroy_id(ctx->cm_id);
/* Reading the cm_id without holding a positive ref is not allowed */
ctx->cm_id = NULL;
}
static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
{
struct ucma_context *ctx;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;
INIT_WORK(&ctx->close_work, ucma_close_id);
init_completion(&ctx->comp);
INIT_LIST_HEAD(&ctx->mc_list);
/* So list_del() will work if we don't do ucma_finish_ctx() */
INIT_LIST_HEAD(&ctx->list);
ctx->file = file;
mutex_init(&ctx->mutex);
if (xa_alloc(&ctx_table, &ctx->id, NULL, xa_limit_32b, GFP_KERNEL)) {
kfree(ctx);
return NULL;
}
return ctx;
}
static void ucma_set_ctx_cm_id(struct ucma_context *ctx,
struct rdma_cm_id *cm_id)
{
refcount_set(&ctx->ref, 1);
ctx->cm_id = cm_id;
}
static void ucma_finish_ctx(struct ucma_context *ctx)
{
lockdep_assert_held(&ctx->file->mut);
list_add_tail(&ctx->list, &ctx->file->ctx_list);
xa_store(&ctx_table, ctx->id, ctx, GFP_KERNEL);
}
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 ib_device *device,
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(device, &dst->ah_attr, &src->ah_attr);
dst->qp_num = src->qp_num;
dst->qkey = src->qkey;
}
static struct ucma_event *ucma_create_uevent(struct ucma_context *ctx,
struct rdma_cm_event *event)
{
struct ucma_event *uevent;
uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
if (!uevent)
return NULL;
uevent->ctx = ctx;
switch (event->event) {
case RDMA_CM_EVENT_MULTICAST_JOIN:
case RDMA_CM_EVENT_MULTICAST_ERROR:
uevent->mc = (struct ucma_multicast *)
event->param.ud.private_data;
uevent->resp.uid = uevent->mc->uid;
uevent->resp.id = uevent->mc->id;
break;
default:
uevent->resp.uid = ctx->uid;
uevent->resp.id = ctx->id;
break;
}
uevent->resp.event = event->event;
uevent->resp.status = event->status;
if (ctx->cm_id->qp_type == IB_QPT_UD)
ucma_copy_ud_event(ctx->cm_id->device, &uevent->resp.param.ud,
&event->param.ud);
else
ucma_copy_conn_event(&uevent->resp.param.conn,
&event->param.conn);
uevent->resp.ece.vendor_id = event->ece.vendor_id;
uevent->resp.ece.attr_mod = event->ece.attr_mod;
return uevent;
}
static int ucma_connect_event_handler(struct rdma_cm_id *cm_id,
struct rdma_cm_event *event)
{
struct ucma_context *listen_ctx = cm_id->context;
struct ucma_context *ctx;
struct ucma_event *uevent;
if (!atomic_add_unless(&listen_ctx->backlog, -1, 0))
return -ENOMEM;
ctx = ucma_alloc_ctx(listen_ctx->file);
if (!ctx)
goto err_backlog;
ucma_set_ctx_cm_id(ctx, cm_id);
uevent = ucma_create_uevent(listen_ctx, event);
if (!uevent)
goto err_alloc;
uevent->conn_req_ctx = ctx;
uevent->resp.id = ctx->id;
ctx->cm_id->context = ctx;
mutex_lock(&ctx->file->mut);
ucma_finish_ctx(ctx);
list_add_tail(&uevent->list, &ctx->file->event_list);
mutex_unlock(&ctx->file->mut);
wake_up_interruptible(&ctx->file->poll_wait);
return 0;
err_alloc:
ucma_destroy_private_ctx(ctx);
err_backlog:
atomic_inc(&listen_ctx->backlog);
/* Returning error causes the new ID to be destroyed */
return -ENOMEM;
}
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;
if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
return ucma_connect_event_handler(cm_id, event);
/*
* 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. However, we do need to release the underlying HW
* resources in case of a device removal event.
*/
if (ctx->uid) {
uevent = ucma_create_uevent(ctx, event);
if (!uevent)
return 0;
mutex_lock(&ctx->file->mut);
list_add_tail(&uevent->list, &ctx->file->event_list);
mutex_unlock(&ctx->file->mut);
wake_up_interruptible(&ctx->file->poll_wait);
}
if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) {
xa_lock(&ctx_table);
if (xa_load(&ctx_table, ctx->id) == ctx)
queue_work(system_unbound_wq, &ctx->close_work);
xa_unlock(&ctx_table);
}
return 0;
}
static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_get_event cmd;
struct ucma_event *uevent;
/*
* Old 32 bit user space does not send the 4 byte padding in the
* reserved field. We don't care, allow it to keep working.
*/
if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved) -
sizeof(uevent->resp.ece))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&file->mut);
while (list_empty(&file->event_list)) {
mutex_unlock(&file->mut);
if (file->filp->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible(file->poll_wait,
!list_empty(&file->event_list)))
return -ERESTARTSYS;
mutex_lock(&file->mut);
}
uevent = list_first_entry(&file->event_list, struct ucma_event, list);
if (copy_to_user(u64_to_user_ptr(cmd.response),
&uevent->resp,
min_t(size_t, out_len, sizeof(uevent->resp)))) {
mutex_unlock(&file->mut);
return -EFAULT;
}
list_del(&uevent->list);
uevent->ctx->events_reported++;
if (uevent->mc)
uevent->mc->events_reported++;
if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
atomic_inc(&uevent->ctx->backlog);
mutex_unlock(&file->mut);
kfree(uevent);
return 0;
}
static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
{
switch (cmd->ps) {
case RDMA_PS_TCP:
*qp_type = IB_QPT_RC;
return 0;
case RDMA_PS_UDP:
case RDMA_PS_IPOIB:
*qp_type = IB_QPT_UD;
return 0;
case RDMA_PS_IB:
*qp_type = cmd->qp_type;
return 0;
default:
return -EINVAL;
}
}
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;
struct rdma_cm_id *cm_id;
enum ib_qp_type qp_type;
int ret;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ret = ucma_get_qp_type(&cmd, &qp_type);
if (ret)
return ret;
ctx = ucma_alloc_ctx(file);
if (!ctx)
return -ENOMEM;
ctx->uid = cmd.uid;
cm_id = rdma_create_user_id(ucma_event_handler, ctx, cmd.ps, qp_type);
if (IS_ERR(cm_id)) {
ret = PTR_ERR(cm_id);
goto err1;
}
ucma_set_ctx_cm_id(ctx, cm_id);
resp.id = ctx->id;
if (copy_to_user(u64_to_user_ptr(cmd.response),
&resp, sizeof(resp))) {
ret = -EFAULT;
goto err1;
}
mutex_lock(&file->mut);
ucma_finish_ctx(ctx);
mutex_unlock(&file->mut);
return 0;
err1:
ucma_destroy_private_ctx(ctx);
return ret;
}
static void ucma_cleanup_multicast(struct ucma_context *ctx)
{
struct ucma_multicast *mc, *tmp;
xa_lock(&multicast_table);
list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
list_del(&mc->list);
/*
* At this point mc->ctx->ref is 0 so the mc cannot leave the
* lock on the reader and this is enough serialization
*/
__xa_erase(&multicast_table, mc->id);
kfree(mc);
}
xa_unlock(&multicast_table);
}
static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
{
struct ucma_event *uevent, *tmp;
rdma_lock_handler(mc->ctx->cm_id);
mutex_lock(&mc->ctx->file->mut);
list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
if (uevent->mc != mc)
continue;
list_del(&uevent->list);
kfree(uevent);
}
mutex_unlock(&mc->ctx->file->mut);
rdma_unlock_handler(mc->ctx->cm_id);
}
static int ucma_cleanup_ctx_events(struct ucma_context *ctx)
{
int events_reported;
struct ucma_event *uevent, *tmp;
LIST_HEAD(list);
/* Cleanup events not yet reported to the user.*/
mutex_lock(&ctx->file->mut);
list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
if (uevent->ctx != ctx)
continue;
if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST &&
xa_cmpxchg(&ctx_table, uevent->conn_req_ctx->id,
uevent->conn_req_ctx, XA_ZERO_ENTRY,
GFP_KERNEL) == uevent->conn_req_ctx) {
list_move_tail(&uevent->list, &list);
continue;
}
list_del(&uevent->list);
kfree(uevent);
}
list_del(&ctx->list);
events_reported = ctx->events_reported;
mutex_unlock(&ctx->file->mut);
/*
* If this was a listening ID then any connections spawned from it that
* have not been delivered to userspace are cleaned up too. Must be done
* outside any locks.
*/
list_for_each_entry_safe(uevent, tmp, &list, list) {
ucma_destroy_private_ctx(uevent->conn_req_ctx);
kfree(uevent);
}
return events_reported;
}
/*
* When this is called the xarray must have a XA_ZERO_ENTRY in the ctx->id (ie
* the ctx is not public to the user). This either because:
* - ucma_finish_ctx() hasn't been called
* - xa_cmpxchg() succeed to remove the entry (only one thread can succeed)
*/
static int ucma_destroy_private_ctx(struct ucma_context *ctx)
{
int events_reported;
/*
* Destroy the underlying cm_id. New work queuing is prevented now by
* the removal from the xarray. Once the work is cancled ref will either
* be 0 because the work ran to completion and consumed the ref from the
* xarray, or it will be positive because we still have the ref from the
* xarray. This can also be 0 in cases where cm_id was never set
*/
cancel_work_sync(&ctx->close_work);
if (refcount_read(&ctx->ref))
ucma_close_id(&ctx->close_work);
events_reported = ucma_cleanup_ctx_events(ctx);
ucma_cleanup_multicast(ctx);
WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, XA_ZERO_ENTRY, NULL,
GFP_KERNEL) != NULL);
mutex_destroy(&ctx->mutex);
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;
xa_lock(&ctx_table);
ctx = _ucma_find_context(cmd.id, file);
if (!IS_ERR(ctx)) {
if (__xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY,
GFP_KERNEL) != ctx)
ctx = ERR_PTR(-ENOENT);
}
xa_unlock(&ctx_table);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
resp.events_reported = ucma_destroy_private_ctx(ctx);
if (copy_to_user(u64_to_user_ptr(cmd.response),
&resp, sizeof(resp)))
ret = -EFAULT;
return ret;
}
static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_bind_ip cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
if (!rdma_addr_size_in6(&cmd.addr))
return -EINVAL;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
mutex_unlock(&ctx->mutex);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_bind cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
if (cmd.reserved || !cmd.addr_size ||
cmd.addr_size != rdma_addr_size_kss(&cmd.addr))
return -EINVAL;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
mutex_unlock(&ctx->mutex);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_resolve_ip(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_resolve_ip cmd;
struct ucma_context *ctx;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
!rdma_addr_size_in6(&cmd.dst_addr))
return -EINVAL;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
(struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
mutex_unlock(&ctx->mutex);
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;
if (cmd.reserved ||
(cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) ||
!cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr)))
return -EINVAL;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
(struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
mutex_unlock(&ctx->mutex);
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_dev(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
mutex_unlock(&ctx->mutex);
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_pri_alt_paths;
switch (route->num_pri_alt_paths) {
case 0:
dev_addr = &route->addr.dev_addr;
rdma_addr_get_dgid(dev_addr,
(union ib_gid *) &resp->ib_route[0].dgid);
rdma_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]);
fallthrough;
case 1:
ib_copy_path_rec_to_user(&resp->ib_route[0],
&route->path_rec[0]);
break;
default:
break;
}
}
static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
struct rdma_route *route)
{
resp->num_paths = route->num_pri_alt_paths;
switch (route->num_pri_alt_paths) {
case 0:
rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
(union ib_gid *)&resp->ib_route[0].dgid);
rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
(union ib_gid *)&resp->ib_route[0].sgid);
resp->ib_route[0].pkey = cpu_to_be16(0xffff);
break;
case 2:
ib_copy_path_rec_to_user(&resp->ib_route[1],
&route->path_rec[1]);
fallthrough;
case 1:
ib_copy_path_rec_to_user(&resp->ib_route[0],
&route->path_rec[0]);
break;
default:
break;
}
}
static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
struct rdma_route *route)
{
struct rdma_dev_addr *dev_addr;
dev_addr = &route->addr.dev_addr;
rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
}
static ssize_t ucma_query_route(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_query cmd;
struct rdma_ucm_query_route_resp resp;
struct ucma_context *ctx;
struct sockaddr *addr;
int ret = 0;
if (out_len < offsetof(struct rdma_ucm_query_route_resp, ibdev_index))
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);
mutex_lock(&ctx->mutex);
memset(&resp, 0, sizeof resp);
addr = (struct sockaddr *) &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 = (struct sockaddr *) &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 = (__force __u64) ctx->cm_id->device->node_guid;
resp.ibdev_index = ctx->cm_id->device->index;
resp.port_num = ctx->cm_id->port_num;
if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
ucma_copy_ib_route(&resp, &ctx->cm_id->route);
else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
ucma_copy_iw_route(&resp, &ctx->cm_id->route);
out:
mutex_unlock(&ctx->mutex);
if (copy_to_user(u64_to_user_ptr(cmd.response), &resp,
min_t(size_t, out_len, sizeof(resp))))
ret = -EFAULT;
ucma_put_ctx(ctx);
return ret;
}
static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
struct rdma_ucm_query_addr_resp *resp)
{
if (!cm_id->device)
return;
resp->node_guid = (__force __u64) cm_id->device->node_guid;
resp->ibdev_index = cm_id->device->index;
resp->port_num = cm_id->port_num;
resp->pkey = (__force __u16) cpu_to_be16(
ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
}
static ssize_t ucma_query_addr(struct ucma_context *ctx,
void __user *response, int out_len)
{
struct rdma_ucm_query_addr_resp resp;
struct sockaddr *addr;
int ret = 0;
if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
return -ENOSPC;
memset(&resp, 0, sizeof resp);
addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
resp.src_size = rdma_addr_size(addr);
memcpy(&resp.src_addr, addr, resp.src_size);
addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
resp.dst_size = rdma_addr_size(addr);
memcpy(&resp.dst_addr, addr, resp.dst_size);
ucma_query_device_addr(ctx->cm_id, &resp);
if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
ret = -EFAULT;
return ret;
}
static ssize_t ucma_query_path(struct ucma_context *ctx,
void __user *response, int out_len)
{
struct rdma_ucm_query_path_resp *resp;
int i, ret = 0;
if (out_len < sizeof(*resp))
return -ENOSPC;
resp = kzalloc(out_len, GFP_KERNEL);
if (!resp)
return -ENOMEM;
resp->num_paths = ctx->cm_id->route.num_pri_alt_paths;
for (i = 0, out_len -= sizeof(*resp);
i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
i++, out_len -= sizeof(struct ib_path_rec_data)) {
struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i];
resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
IB_PATH_BIDIRECTIONAL;
if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
struct sa_path_rec ib;
sa_convert_path_opa_to_ib(&ib, rec);
ib_sa_pack_path(&ib, &resp->path_data[i].path_rec);
} else {
ib_sa_pack_path(rec, &resp->path_data[i].path_rec);
}
}
if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
ret = -EFAULT;
kfree(resp);
return ret;
}
static ssize_t ucma_query_gid(struct ucma_context *ctx,
void __user *response, int out_len)
{
struct rdma_ucm_query_addr_resp resp;
struct sockaddr_ib *addr;
int ret = 0;
if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
return -ENOSPC;
memset(&resp, 0, sizeof resp);
ucma_query_device_addr(ctx->cm_id, &resp);
addr = (struct sockaddr_ib *) &resp.src_addr;
resp.src_size = sizeof(*addr);
if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
} else {
addr->sib_family = AF_IB;
addr->sib_pkey = (__force __be16) resp.pkey;
rdma_read_gids(ctx->cm_id, (union ib_gid *)&addr->sib_addr,
NULL);
addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
&ctx->cm_id->route.addr.src_addr);
}
addr = (struct sockaddr_ib *) &resp.dst_addr;
resp.dst_size = sizeof(*addr);
if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
} else {
addr->sib_family = AF_IB;
addr->sib_pkey = (__force __be16) resp.pkey;
rdma_read_gids(ctx->cm_id, NULL,
(union ib_gid *)&addr->sib_addr);
addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
&ctx->cm_id->route.addr.dst_addr);
}
if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
ret = -EFAULT;
return ret;
}
static ssize_t ucma_query(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_query cmd;
struct ucma_context *ctx;
void __user *response;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
response = u64_to_user_ptr(cmd.response);
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
switch (cmd.option) {
case RDMA_USER_CM_QUERY_ADDR:
ret = ucma_query_addr(ctx, response, out_len);
break;
case RDMA_USER_CM_QUERY_PATH:
ret = ucma_query_path(ctx, response, out_len);
break;
case RDMA_USER_CM_QUERY_GID:
ret = ucma_query_gid(ctx, response, out_len);
break;
default:
ret = -ENOSYS;
break;
}
mutex_unlock(&ctx->mutex);
ucma_put_ctx(ctx);
return ret;
}
static void ucma_copy_conn_param(struct rdma_cm_id *id,
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 & 0xFFFFFF;
dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
}
static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_conn_param conn_param;
struct rdma_ucm_ece ece = {};
struct rdma_ucm_connect cmd;
struct ucma_context *ctx;
size_t in_size;
int ret;
if (in_len < offsetofend(typeof(cmd), reserved))
return -EINVAL;
in_size = min_t(size_t, in_len, sizeof(cmd));
if (copy_from_user(&cmd, inbuf, in_size))
return -EFAULT;
if (!cmd.conn_param.valid)
return -EINVAL;
ctx = ucma_get_ctx_dev(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
if (offsetofend(typeof(cmd), ece) <= in_size) {
ece.vendor_id = cmd.ece.vendor_id;
ece.attr_mod = cmd.ece.attr_mod;
}
mutex_lock(&ctx->mutex);
ret = rdma_connect_ece(ctx->cm_id, &conn_param, &ece);
mutex_unlock(&ctx->mutex);
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);
if (cmd.backlog <= 0 || cmd.backlog > max_backlog)
cmd.backlog = max_backlog;
atomic_set(&ctx->backlog, cmd.backlog);
mutex_lock(&ctx->mutex);
ret = rdma_listen(ctx->cm_id, cmd.backlog);
mutex_unlock(&ctx->mutex);
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 rdma_ucm_ece ece = {};
struct ucma_context *ctx;
size_t in_size;
int ret;
if (in_len < offsetofend(typeof(cmd), reserved))
return -EINVAL;
in_size = min_t(size_t, in_len, sizeof(cmd));
if (copy_from_user(&cmd, inbuf, in_size))
return -EFAULT;
ctx = ucma_get_ctx_dev(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
if (offsetofend(typeof(cmd), ece) <= in_size) {
ece.vendor_id = cmd.ece.vendor_id;
ece.attr_mod = cmd.ece.attr_mod;
}
if (cmd.conn_param.valid) {
ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
mutex_lock(&ctx->mutex);
rdma_lock_handler(ctx->cm_id);
ret = rdma_accept_ece(ctx->cm_id, &conn_param, &ece);
if (!ret) {
/* The uid must be set atomically with the handler */
ctx->uid = cmd.uid;
}
rdma_unlock_handler(ctx->cm_id);
mutex_unlock(&ctx->mutex);
} else {
mutex_lock(&ctx->mutex);
rdma_lock_handler(ctx->cm_id);
ret = rdma_accept_ece(ctx->cm_id, NULL, &ece);
rdma_unlock_handler(ctx->cm_id);
mutex_unlock(&ctx->mutex);
}
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;
if (!cmd.reason)
cmd.reason = IB_CM_REJ_CONSUMER_DEFINED;
switch (cmd.reason) {
case IB_CM_REJ_CONSUMER_DEFINED:
case IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED:
break;
default:
return -EINVAL;
}
ctx = ucma_get_ctx_dev(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len,
cmd.reason);
mutex_unlock(&ctx->mutex);
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_dev(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mutex_lock(&ctx->mutex);
ret = rdma_disconnect(ctx->cm_id);
mutex_unlock(&ctx->mutex);
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;
if (cmd.qp_state > IB_QPS_ERR)
return -EINVAL;
ctx = ucma_get_ctx_dev(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;
mutex_lock(&ctx->mutex);
ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
mutex_unlock(&ctx->mutex);
if (ret)
goto out;
ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
if (copy_to_user(u64_to_user_ptr(cmd.response),
&resp, sizeof(resp)))
ret = -EFAULT;
out:
ucma_put_ctx(ctx);
return ret;
}
static int ucma_set_option_id(struct ucma_context *ctx, int optname,
void *optval, size_t optlen)
{
int ret = 0;
switch (optname) {
case RDMA_OPTION_ID_TOS:
if (optlen != sizeof(u8)) {
ret = -EINVAL;
break;
}
rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
break;
case RDMA_OPTION_ID_REUSEADDR:
if (optlen != sizeof(int)) {
ret = -EINVAL;
break;
}
ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
break;
case RDMA_OPTION_ID_AFONLY:
if (optlen != sizeof(int)) {
ret = -EINVAL;
break;
}
ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
break;
case RDMA_OPTION_ID_ACK_TIMEOUT:
if (optlen != sizeof(u8)) {
ret = -EINVAL;
break;
}
ret = rdma_set_ack_timeout(ctx->cm_id, *((u8 *)optval));
break;
default:
ret = -ENOSYS;
}
return ret;
}
static int ucma_set_ib_path(struct ucma_context *ctx,
struct ib_path_rec_data *path_data, size_t optlen)
{
struct sa_path_rec sa_path;
struct rdma_cm_event event;
int ret;
if (optlen % sizeof(*path_data))
return -EINVAL;
for (; optlen; optlen -= sizeof(*path_data), path_data++) {
if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
IB_PATH_BIDIRECTIONAL))
break;
}
if (!optlen)
return -EINVAL;
if (!ctx->cm_id->device)
return -EINVAL;
memset(&sa_path, 0, sizeof(sa_path));
sa_path.rec_type = SA_PATH_REC_TYPE_IB;
ib_sa_unpack_path(path_data->path_rec, &sa_path);
if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
struct sa_path_rec opa;
sa_convert_path_ib_to_opa(&opa, &sa_path);
mutex_lock(&ctx->mutex);
ret = rdma_set_ib_path(ctx->cm_id, &opa);
mutex_unlock(&ctx->mutex);
} else {
mutex_lock(&ctx->mutex);
ret = rdma_set_ib_path(ctx->cm_id, &sa_path);
mutex_unlock(&ctx->mutex);
}
if (ret)
return ret;
memset(&event, 0, sizeof event);
event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
return ucma_event_handler(ctx->cm_id, &event);
}
static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
void *optval, size_t optlen)
{
int ret;
switch (optname) {
case RDMA_OPTION_IB_PATH:
ret = ucma_set_ib_path(ctx, optval, optlen);
break;
default:
ret = -ENOSYS;
}
return ret;
}
static int ucma_set_option_level(struct ucma_context *ctx, int level,
int optname, void *optval, size_t optlen)
{
int ret;
switch (level) {
case RDMA_OPTION_ID:
mutex_lock(&ctx->mutex);
ret = ucma_set_option_id(ctx, optname, optval, optlen);
mutex_unlock(&ctx->mutex);
break;
case RDMA_OPTION_IB:
ret = ucma_set_option_ib(ctx, optname, optval, optlen);
break;
default:
ret = -ENOSYS;
}
return ret;
}
static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_set_option cmd;
struct ucma_context *ctx;
void *optval;
int ret;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
return -EINVAL;
ctx = ucma_get_ctx(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
optval = memdup_user(u64_to_user_ptr(cmd.optval),
cmd.optlen);
if (IS_ERR(optval)) {
ret = PTR_ERR(optval);
goto out;
}
ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
cmd.optlen);
kfree(optval);
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 = -EINVAL;
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);
mutex_lock(&ctx->mutex);
if (ctx->cm_id->device)
ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event);
mutex_unlock(&ctx->mutex);
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_process_join(struct ucma_file *file,
struct rdma_ucm_join_mcast *cmd, int out_len)
{
struct rdma_ucm_create_id_resp resp;
struct ucma_context *ctx;
struct ucma_multicast *mc;
struct sockaddr *addr;
int ret;
u8 join_state;
if (out_len < sizeof(resp))
return -ENOSPC;
addr = (struct sockaddr *) &cmd->addr;
if (cmd->addr_size != rdma_addr_size(addr))
return -EINVAL;
if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
join_state = BIT(FULLMEMBER_JOIN);
else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
else
return -EINVAL;
ctx = ucma_get_ctx_dev(file, cmd->id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
mc = kzalloc(sizeof(*mc), GFP_KERNEL);
if (!mc) {
ret = -ENOMEM;
goto err_put_ctx;
}
mc->ctx = ctx;
mc->join_state = join_state;
mc->uid = cmd->uid;
memcpy(&mc->addr, addr, cmd->addr_size);
xa_lock(&multicast_table);
if (__xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b,
GFP_KERNEL)) {
ret = -ENOMEM;
goto err_free_mc;
}
list_add_tail(&mc->list, &ctx->mc_list);
xa_unlock(&multicast_table);
mutex_lock(&ctx->mutex);
ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
join_state, mc);
mutex_unlock(&ctx->mutex);
if (ret)
goto err_xa_erase;
resp.id = mc->id;
if (copy_to_user(u64_to_user_ptr(cmd->response),
&resp, sizeof(resp))) {
ret = -EFAULT;
goto err_leave_multicast;
}
xa_store(&multicast_table, mc->id, mc, 0);
ucma_put_ctx(ctx);
return 0;
err_leave_multicast:
mutex_lock(&ctx->mutex);
rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
mutex_unlock(&ctx->mutex);
ucma_cleanup_mc_events(mc);
err_xa_erase:
xa_lock(&multicast_table);
list_del(&mc->list);
__xa_erase(&multicast_table, mc->id);
err_free_mc:
xa_unlock(&multicast_table);
kfree(mc);
err_put_ctx:
ucma_put_ctx(ctx);
return ret;
}
static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_join_ip_mcast cmd;
struct rdma_ucm_join_mcast join_cmd;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
join_cmd.response = cmd.response;
join_cmd.uid = cmd.uid;
join_cmd.id = cmd.id;
join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr);
if (!join_cmd.addr_size)
return -EINVAL;
join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
return ucma_process_join(file, &join_cmd, out_len);
}
static ssize_t ucma_join_multicast(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_join_mcast cmd;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
if (!rdma_addr_size_kss(&cmd.addr))
return -EINVAL;
return ucma_process_join(file, &cmd, out_len);
}
static ssize_t ucma_leave_multicast(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_multicast *mc;
int ret = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
xa_lock(&multicast_table);
mc = xa_load(&multicast_table, cmd.id);
if (!mc)
mc = ERR_PTR(-ENOENT);
else if (READ_ONCE(mc->ctx->file) != file)
mc = ERR_PTR(-EINVAL);
else if (!refcount_inc_not_zero(&mc->ctx->ref))
mc = ERR_PTR(-ENXIO);
if (IS_ERR(mc)) {
xa_unlock(&multicast_table);
ret = PTR_ERR(mc);
goto out;
}
list_del(&mc->list);
__xa_erase(&multicast_table, mc->id);
xa_unlock(&multicast_table);
mutex_lock(&mc->ctx->mutex);
rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
mutex_unlock(&mc->ctx->mutex);
ucma_cleanup_mc_events(mc);
ucma_put_ctx(mc->ctx);
resp.events_reported = mc->events_reported;
kfree(mc);
if (copy_to_user(u64_to_user_ptr(cmd.response),
&resp, sizeof(resp)))
ret = -EFAULT;
out:
return ret;
}
static ssize_t ucma_migrate_id(struct ucma_file *new_file,
const char __user *inbuf,
int in_len, int out_len)
{
struct rdma_ucm_migrate_id cmd;
struct rdma_ucm_migrate_resp resp;
struct ucma_event *uevent, *tmp;
struct ucma_context *ctx;
LIST_HEAD(event_list);
struct fd f;
struct ucma_file *cur_file;
int ret = 0;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
/* Get current fd to protect against it being closed */
f = fdget(cmd.fd);
if (!fd_file(f))
return -ENOENT;
if (fd_file(f)->f_op != &ucma_fops) {
ret = -EINVAL;
goto file_put;
}
cur_file = fd_file(f)->private_data;
/* Validate current fd and prevent destruction of id. */
ctx = ucma_get_ctx(cur_file, cmd.id);
if (IS_ERR(ctx)) {
ret = PTR_ERR(ctx);
goto file_put;
}
rdma_lock_handler(ctx->cm_id);
/*
* ctx->file can only be changed under the handler & xa_lock. xa_load()
* must be checked again to ensure the ctx hasn't begun destruction
* since the ucma_get_ctx().
*/
xa_lock(&ctx_table);
if (_ucma_find_context(cmd.id, cur_file) != ctx) {
xa_unlock(&ctx_table);
ret = -ENOENT;
goto err_unlock;
}
ctx->file = new_file;
xa_unlock(&ctx_table);
mutex_lock(&cur_file->mut);
list_del(&ctx->list);
/*
* At this point lock_handler() prevents addition of new uevents for
* this ctx.
*/
list_for_each_entry_safe(uevent, tmp, &cur_file->event_list, list)
if (uevent->ctx == ctx)
list_move_tail(&uevent->list, &event_list);
resp.events_reported = ctx->events_reported;
mutex_unlock(&cur_file->mut);
mutex_lock(&new_file->mut);
list_add_tail(&ctx->list, &new_file->ctx_list);
list_splice_tail(&event_list, &new_file->event_list);
mutex_unlock(&new_file->mut);
if (copy_to_user(u64_to_user_ptr(cmd.response),
&resp, sizeof(resp)))
ret = -EFAULT;
err_unlock:
rdma_unlock_handler(ctx->cm_id);
ucma_put_ctx(ctx);
file_put:
fdput(f);
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_IP] = ucma_bind_ip,
[RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
[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] = ucma_set_option,
[RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
[RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
[RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
[RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
[RDMA_USER_CM_CMD_QUERY] = ucma_query,
[RDMA_USER_CM_CMD_BIND] = ucma_bind,
[RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
[RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
};
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 (!ib_safe_file_access(filp)) {
pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
__func__, task_tgid_vnr(current), current->comm);
return -EACCES;
}
if (len < sizeof(hdr))
return -EINVAL;
if (copy_from_user(&hdr, buf, sizeof(hdr)))
return -EFAULT;
if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
return -EINVAL;
hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucma_cmd_table));
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 __poll_t ucma_poll(struct file *filp, struct poll_table_struct *wait)
{
struct ucma_file *file = filp->private_data;
__poll_t mask = 0;
poll_wait(filp, &file->poll_wait, wait);
if (!list_empty(&file->event_list))
mask = EPOLLIN | EPOLLRDNORM;
return mask;
}
/*
* ucma_open() does not need the BKL:
*
* - no global state is referred to;
* - there is no ioctl method to race against;
* - no further module initialization is required for open to work
* after the device is registered.
*/
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 stream_open(inode, filp);
}
static int ucma_close(struct inode *inode, struct file *filp)
{
struct ucma_file *file = filp->private_data;
/*
* All paths that touch ctx_list or ctx_list starting from write() are
* prevented by this being a FD release function. The list_add_tail() in
* ucma_connect_event_handler() can run concurrently, however it only
* adds to the list *after* a listening ID. By only reading the first of
* the list, and relying on ucma_destroy_private_ctx() to block
* ucma_connect_event_handler(), no additional locking is needed.
*/
while (!list_empty(&file->ctx_list)) {
struct ucma_context *ctx = list_first_entry(
&file->ctx_list, struct ucma_context, list);
WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY,
GFP_KERNEL) != ctx);
ucma_destroy_private_ctx(ctx);
}
kfree(file);
return 0;
}
static const 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",
.nodename = "infiniband/rdma_cm",
.mode = 0666,
.fops = &ucma_fops,
};
static int ucma_get_global_nl_info(struct ib_client_nl_info *res)
{
res->abi = RDMA_USER_CM_ABI_VERSION;
res->cdev = ucma_misc.this_device;
return 0;
}
static struct ib_client rdma_cma_client = {
.name = "rdma_cm",
.get_global_nl_info = ucma_get_global_nl_info,
};
MODULE_ALIAS_RDMA_CLIENT("rdma_cm");
static ssize_t abi_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
}
static DEVICE_ATTR_RO(abi_version);
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) {
pr_err("rdma_ucm: couldn't create abi_version attr\n");
goto err1;
}
ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
if (!ucma_ctl_table_hdr) {
pr_err("rdma_ucm: couldn't register sysctl paths\n");
ret = -ENOMEM;
goto err2;
}
ret = ib_register_client(&rdma_cma_client);
if (ret)
goto err3;
return 0;
err3:
unregister_net_sysctl_table(ucma_ctl_table_hdr);
err2:
device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
err1:
misc_deregister(&ucma_misc);
return ret;
}
static void __exit ucma_cleanup(void)
{
ib_unregister_client(&rdma_cma_client);
unregister_net_sysctl_table(ucma_ctl_table_hdr);
device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
misc_deregister(&ucma_misc);
}
module_init(ucma_init);
module_exit(ucma_cleanup);
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