/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 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/init.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/cdev.h>
#include <linux/idr.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <rdma/ib.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_user_cm.h>
#include <rdma/ib_marshall.h>
MODULE_AUTHOR("Libor Michalek");
MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
MODULE_LICENSE("Dual BSD/GPL");
struct ib_ucm_device {
int devnum;
struct cdev cdev;
struct device dev;
struct ib_device *ib_dev;
};
struct ib_ucm_file {
struct mutex file_mutex;
struct file *filp;
struct ib_ucm_device *device;
struct list_head ctxs;
struct list_head events;
wait_queue_head_t poll_wait;
};
struct ib_ucm_context {
int id;
struct completion comp;
atomic_t ref;
int events_reported;
struct ib_ucm_file *file;
struct ib_cm_id *cm_id;
__u64 uid;
struct list_head events; /* list of pending events. */
struct list_head file_list; /* member in file ctx list */
};
struct ib_ucm_event {
struct ib_ucm_context *ctx;
struct list_head file_list; /* member in file event list */
struct list_head ctx_list; /* member in ctx event list */
struct ib_cm_id *cm_id;
struct ib_ucm_event_resp resp;
void *data;
void *info;
int data_len;
int info_len;
};
enum {
IB_UCM_MAJOR = 231,
IB_UCM_BASE_MINOR = 224,
IB_UCM_MAX_DEVICES = 32
};
#define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
static void ib_ucm_add_one(struct ib_device *device);
static void ib_ucm_remove_one(struct ib_device *device, void *client_data);
static struct ib_client ucm_client = {
.name = "ucm",
.add = ib_ucm_add_one,
.remove = ib_ucm_remove_one
};
static DEFINE_MUTEX(ctx_id_mutex);
static DEFINE_IDR(ctx_id_table);
static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
{
struct ib_ucm_context *ctx;
mutex_lock(&ctx_id_mutex);
ctx = idr_find(&ctx_id_table, id);
if (!ctx)
ctx = ERR_PTR(-ENOENT);
else if (ctx->file != file)
ctx = ERR_PTR(-EINVAL);
else
atomic_inc(&ctx->ref);
mutex_unlock(&ctx_id_mutex);
return ctx;
}
static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
{
if (atomic_dec_and_test(&ctx->ref))
complete(&ctx->comp);
}
static inline int ib_ucm_new_cm_id(int event)
{
return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
}
static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
{
struct ib_ucm_event *uevent;
mutex_lock(&ctx->file->file_mutex);
list_del(&ctx->file_list);
while (!list_empty(&ctx->events)) {
uevent = list_entry(ctx->events.next,
struct ib_ucm_event, ctx_list);
list_del(&uevent->file_list);
list_del(&uevent->ctx_list);
mutex_unlock(&ctx->file->file_mutex);
/* clear incoming connections. */
if (ib_ucm_new_cm_id(uevent->resp.event))
ib_destroy_cm_id(uevent->cm_id);
kfree(uevent);
mutex_lock(&ctx->file->file_mutex);
}
mutex_unlock(&ctx->file->file_mutex);
}
static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
{
struct ib_ucm_context *ctx;
ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
if (!ctx)
return NULL;
atomic_set(&ctx->ref, 1);
init_completion(&ctx->comp);
ctx->file = file;
INIT_LIST_HEAD(&ctx->events);
mutex_lock(&ctx_id_mutex);
ctx->id = idr_alloc(&ctx_id_table, ctx, 0, 0, GFP_KERNEL);
mutex_unlock(&ctx_id_mutex);
if (ctx->id < 0)
goto error;
list_add_tail(&ctx->file_list, &file->ctxs);
return ctx;
error:
kfree(ctx);
return NULL;
}
static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
struct ib_cm_req_event_param *kreq)
{
ureq->remote_ca_guid = kreq->remote_ca_guid;
ureq->remote_qkey = kreq->remote_qkey;
ureq->remote_qpn = kreq->remote_qpn;
ureq->qp_type = kreq->qp_type;
ureq->starting_psn = kreq->starting_psn;
ureq->responder_resources = kreq->responder_resources;
ureq->initiator_depth = kreq->initiator_depth;
ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
ureq->flow_control = kreq->flow_control;
ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
ureq->retry_count = kreq->retry_count;
ureq->rnr_retry_count = kreq->rnr_retry_count;
ureq->srq = kreq->srq;
ureq->port = kreq->port;
ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
if (kreq->alternate_path)
ib_copy_path_rec_to_user(&ureq->alternate_path,
kreq->alternate_path);
}
static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
struct ib_cm_rep_event_param *krep)
{
urep->remote_ca_guid = krep->remote_ca_guid;
urep->remote_qkey = krep->remote_qkey;
urep->remote_qpn = krep->remote_qpn;
urep->starting_psn = krep->starting_psn;
urep->responder_resources = krep->responder_resources;
urep->initiator_depth = krep->initiator_depth;
urep->target_ack_delay = krep->target_ack_delay;
urep->failover_accepted = krep->failover_accepted;
urep->flow_control = krep->flow_control;
urep->rnr_retry_count = krep->rnr_retry_count;
urep->srq = krep->srq;
}
static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
struct ib_cm_sidr_rep_event_param *krep)
{
urep->status = krep->status;
urep->qkey = krep->qkey;
urep->qpn = krep->qpn;
};
static int ib_ucm_event_process(struct ib_cm_event *evt,
struct ib_ucm_event *uvt)
{
void *info = NULL;
switch (evt->event) {
case IB_CM_REQ_RECEIVED:
ib_ucm_event_req_get(&uvt->resp.u.req_resp,
&evt->param.req_rcvd);
uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
uvt->resp.present = IB_UCM_PRES_PRIMARY;
uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
IB_UCM_PRES_ALTERNATE : 0);
break;
case IB_CM_REP_RECEIVED:
ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
&evt->param.rep_rcvd);
uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
break;
case IB_CM_RTU_RECEIVED:
uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
uvt->resp.u.send_status = evt->param.send_status;
break;
case IB_CM_DREQ_RECEIVED:
uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
uvt->resp.u.send_status = evt->param.send_status;
break;
case IB_CM_DREP_RECEIVED:
uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
uvt->resp.u.send_status = evt->param.send_status;
break;
case IB_CM_MRA_RECEIVED:
uvt->resp.u.mra_resp.timeout =
evt->param.mra_rcvd.service_timeout;
uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
break;
case IB_CM_REJ_RECEIVED:
uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
uvt->info_len = evt->param.rej_rcvd.ari_length;
info = evt->param.rej_rcvd.ari;
break;
case IB_CM_LAP_RECEIVED:
ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
evt->param.lap_rcvd.alternate_path);
uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
uvt->resp.present = IB_UCM_PRES_ALTERNATE;
break;
case IB_CM_APR_RECEIVED:
uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
uvt->info_len = evt->param.apr_rcvd.info_len;
info = evt->param.apr_rcvd.apr_info;
break;
case IB_CM_SIDR_REQ_RECEIVED:
uvt->resp.u.sidr_req_resp.pkey =
evt->param.sidr_req_rcvd.pkey;
uvt->resp.u.sidr_req_resp.port =
evt->param.sidr_req_rcvd.port;
uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
break;
case IB_CM_SIDR_REP_RECEIVED:
ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
&evt->param.sidr_rep_rcvd);
uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
info = evt->param.sidr_rep_rcvd.info;
break;
default:
uvt->resp.u.send_status = evt->param.send_status;
break;
}
if (uvt->data_len) {
uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
if (!uvt->data)
goto err1;
uvt->resp.present |= IB_UCM_PRES_DATA;
}
if (uvt->info_len) {
uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
if (!uvt->info)
goto err2;
uvt->resp.present |= IB_UCM_PRES_INFO;
}
return 0;
err2:
kfree(uvt->data);
err1:
return -ENOMEM;
}
static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event)
{
struct ib_ucm_event *uevent;
struct ib_ucm_context *ctx;
int result = 0;
ctx = cm_id->context;
uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
if (!uevent)
goto err1;
uevent->ctx = ctx;
uevent->cm_id = cm_id;
uevent->resp.uid = ctx->uid;
uevent->resp.id = ctx->id;
uevent->resp.event = event->event;
result = ib_ucm_event_process(event, uevent);
if (result)
goto err2;
mutex_lock(&ctx->file->file_mutex);
list_add_tail(&uevent->file_list, &ctx->file->events);
list_add_tail(&uevent->ctx_list, &ctx->events);
wake_up_interruptible(&ctx->file->poll_wait);
mutex_unlock(&ctx->file->file_mutex);
return 0;
err2:
kfree(uevent);
err1:
/* Destroy new cm_id's */
return ib_ucm_new_cm_id(event->event);
}
static ssize_t ib_ucm_event(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_context *ctx;
struct ib_ucm_event_get cmd;
struct ib_ucm_event *uevent;
int result = 0;
if (out_len < sizeof(struct ib_ucm_event_resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&file->file_mutex);
while (list_empty(&file->events)) {
mutex_unlock(&file->file_mutex);
if (file->filp->f_flags & O_NONBLOCK)
return -EAGAIN;
if (wait_event_interruptible(file->poll_wait,
!list_empty(&file->events)))
return -ERESTARTSYS;
mutex_lock(&file->file_mutex);
}
uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
if (ib_ucm_new_cm_id(uevent->resp.event)) {
ctx = ib_ucm_ctx_alloc(file);
if (!ctx) {
result = -ENOMEM;
goto done;
}
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))) {
result = -EFAULT;
goto done;
}
if (uevent->data) {
if (cmd.data_len < uevent->data_len) {
result = -ENOMEM;
goto done;
}
if (copy_to_user((void __user *)(unsigned long)cmd.data,
uevent->data, uevent->data_len)) {
result = -EFAULT;
goto done;
}
}
if (uevent->info) {
if (cmd.info_len < uevent->info_len) {
result = -ENOMEM;
goto done;
}
if (copy_to_user((void __user *)(unsigned long)cmd.info,
uevent->info, uevent->info_len)) {
result = -EFAULT;
goto done;
}
}
list_del(&uevent->file_list);
list_del(&uevent->ctx_list);
uevent->ctx->events_reported++;
kfree(uevent->data);
kfree(uevent->info);
kfree(uevent);
done:
mutex_unlock(&file->file_mutex);
return result;
}
static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_create_id cmd;
struct ib_ucm_create_id_resp resp;
struct ib_ucm_context *ctx;
int result;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&file->file_mutex);
ctx = ib_ucm_ctx_alloc(file);
mutex_unlock(&file->file_mutex);
if (!ctx)
return -ENOMEM;
ctx->uid = cmd.uid;
ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
ib_ucm_event_handler, ctx);
if (IS_ERR(ctx->cm_id)) {
result = PTR_ERR(ctx->cm_id);
goto err1;
}
resp.id = ctx->id;
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp))) {
result = -EFAULT;
goto err2;
}
return 0;
err2:
ib_destroy_cm_id(ctx->cm_id);
err1:
mutex_lock(&ctx_id_mutex);
idr_remove(&ctx_id_table, ctx->id);
mutex_unlock(&ctx_id_mutex);
kfree(ctx);
return result;
}
static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_destroy_id cmd;
struct ib_ucm_destroy_id_resp resp;
struct ib_ucm_context *ctx;
int result = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
mutex_lock(&ctx_id_mutex);
ctx = idr_find(&ctx_id_table, cmd.id);
if (!ctx)
ctx = ERR_PTR(-ENOENT);
else if (ctx->file != file)
ctx = ERR_PTR(-EINVAL);
else
idr_remove(&ctx_id_table, ctx->id);
mutex_unlock(&ctx_id_mutex);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ib_ucm_ctx_put(ctx);
wait_for_completion(&ctx->comp);
/* No new events will be generated after destroying the cm_id. */
ib_destroy_cm_id(ctx->cm_id);
/* Cleanup events not yet reported to the user. */
ib_ucm_cleanup_events(ctx);
resp.events_reported = ctx->events_reported;
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp)))
result = -EFAULT;
kfree(ctx);
return result;
}
static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_attr_id_resp resp;
struct ib_ucm_attr_id cmd;
struct ib_ucm_context *ctx;
int result = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
resp.service_id = ctx->cm_id->service_id;
resp.service_mask = ctx->cm_id->service_mask;
resp.local_id = ctx->cm_id->local_id;
resp.remote_id = ctx->cm_id->remote_id;
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp)))
result = -EFAULT;
ib_ucm_ctx_put(ctx);
return result;
}
static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_uverbs_qp_attr resp;
struct ib_ucm_init_qp_attr cmd;
struct ib_ucm_context *ctx;
struct ib_qp_attr qp_attr;
int result = 0;
if (out_len < sizeof(resp))
return -ENOSPC;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ib_ucm_ctx_get(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;
result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
if (result)
goto out;
ib_copy_qp_attr_to_user(&resp, &qp_attr);
if (copy_to_user((void __user *)(unsigned long)cmd.response,
&resp, sizeof(resp)))
result = -EFAULT;
out:
ib_ucm_ctx_put(ctx);
return result;
}
static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
{
service_id &= service_mask;
if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
return -EINVAL;
return 0;
}
static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_listen cmd;
struct ib_ucm_context *ctx;
int result;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
if (result)
goto out;
result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask);
out:
ib_ucm_ctx_put(ctx);
return result;
}
static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_notify cmd;
struct ib_ucm_context *ctx;
int result;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
ib_ucm_ctx_put(ctx);
return result;
}
static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
{
void *data;
*dest = NULL;
if (!len)
return 0;
data = memdup_user((void __user *)(unsigned long)src, len);
if (IS_ERR(data))
return PTR_ERR(data);
*dest = data;
return 0;
}
static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
{
struct ib_user_path_rec upath;
struct ib_sa_path_rec *sa_path;
*path = NULL;
if (!src)
return 0;
sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
if (!sa_path)
return -ENOMEM;
if (copy_from_user(&upath, (void __user *)(unsigned long)src,
sizeof(upath))) {
kfree(sa_path);
return -EFAULT;
}
ib_copy_path_rec_from_user(sa_path, &upath);
*path = sa_path;
return 0;
}
static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_cm_req_param param;
struct ib_ucm_context *ctx;
struct ib_ucm_req cmd;
int result;
param.private_data = NULL;
param.primary_path = NULL;
param.alternate_path = NULL;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
if (result)
goto done;
result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
if (result)
goto done;
result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
if (result)
goto done;
param.private_data_len = cmd.len;
param.service_id = cmd.sid;
param.qp_num = cmd.qpn;
param.qp_type = cmd.qp_type;
param.starting_psn = cmd.psn;
param.peer_to_peer = cmd.peer_to_peer;
param.responder_resources = cmd.responder_resources;
param.initiator_depth = cmd.initiator_depth;
param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
param.flow_control = cmd.flow_control;
param.local_cm_response_timeout = cmd.local_cm_response_timeout;
param.retry_count = cmd.retry_count;
param.rnr_retry_count = cmd.rnr_retry_count;
param.max_cm_retries = cmd.max_cm_retries;
param.srq = cmd.srq;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = ib_send_cm_req(ctx->cm_id, ¶m);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
done:
kfree(param.private_data);
kfree(param.primary_path);
kfree(param.alternate_path);
return result;
}
static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_cm_rep_param param;
struct ib_ucm_context *ctx;
struct ib_ucm_rep cmd;
int result;
param.private_data = NULL;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
if (result)
return result;
param.qp_num = cmd.qpn;
param.starting_psn = cmd.psn;
param.private_data_len = cmd.len;
param.responder_resources = cmd.responder_resources;
param.initiator_depth = cmd.initiator_depth;
param.failover_accepted = cmd.failover_accepted;
param.flow_control = cmd.flow_control;
param.rnr_retry_count = cmd.rnr_retry_count;
param.srq = cmd.srq;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
ctx->uid = cmd.uid;
result = ib_send_cm_rep(ctx->cm_id, ¶m);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
kfree(param.private_data);
return result;
}
static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
const char __user *inbuf, int in_len,
int (*func)(struct ib_cm_id *cm_id,
const void *private_data,
u8 private_data_len))
{
struct ib_ucm_private_data cmd;
struct ib_ucm_context *ctx;
const void *private_data = NULL;
int result;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
if (result)
return result;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = func(ctx->cm_id, private_data, cmd.len);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
kfree(private_data);
return result;
}
static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
}
static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
}
static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
}
static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
const char __user *inbuf, int in_len,
int (*func)(struct ib_cm_id *cm_id,
int status,
const void *info,
u8 info_len,
const void *data,
u8 data_len))
{
struct ib_ucm_context *ctx;
struct ib_ucm_info cmd;
const void *data = NULL;
const void *info = NULL;
int result;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
if (result)
goto done;
result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
if (result)
goto done;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
data, cmd.data_len);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
done:
kfree(data);
kfree(info);
return result;
}
static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
}
static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
}
static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_context *ctx;
struct ib_ucm_mra cmd;
const void *data = NULL;
int result;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
if (result)
return result;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
kfree(data);
return result;
}
static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_ucm_context *ctx;
struct ib_sa_path_rec *path = NULL;
struct ib_ucm_lap cmd;
const void *data = NULL;
int result;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
if (result)
goto done;
result = ib_ucm_path_get(&path, cmd.path);
if (result)
goto done;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
done:
kfree(data);
kfree(path);
return result;
}
static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_cm_sidr_req_param param;
struct ib_ucm_context *ctx;
struct ib_ucm_sidr_req cmd;
int result;
param.private_data = NULL;
param.path = NULL;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
if (result)
goto done;
result = ib_ucm_path_get(¶m.path, cmd.path);
if (result)
goto done;
param.private_data_len = cmd.len;
param.service_id = cmd.sid;
param.timeout_ms = cmd.timeout;
param.max_cm_retries = cmd.max_cm_retries;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
done:
kfree(param.private_data);
kfree(param.path);
return result;
}
static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len)
{
struct ib_cm_sidr_rep_param param;
struct ib_ucm_sidr_rep cmd;
struct ib_ucm_context *ctx;
int result;
param.info = NULL;
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
result = ib_ucm_alloc_data(¶m.private_data,
cmd.data, cmd.data_len);
if (result)
goto done;
result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
if (result)
goto done;
param.qp_num = cmd.qpn;
param.qkey = cmd.qkey;
param.status = cmd.status;
param.info_length = cmd.info_len;
param.private_data_len = cmd.data_len;
ctx = ib_ucm_ctx_get(file, cmd.id);
if (!IS_ERR(ctx)) {
result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
ib_ucm_ctx_put(ctx);
} else
result = PTR_ERR(ctx);
done:
kfree(param.private_data);
kfree(param.info);
return result;
}
static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
const char __user *inbuf,
int in_len, int out_len) = {
[IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
[IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
[IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
[IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
[IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
[IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
[IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
[IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
[IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
[IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
[IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
[IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
[IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
[IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
[IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
[IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
[IB_USER_CM_CMD_EVENT] = ib_ucm_event,
[IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
};
static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
size_t len, loff_t *pos)
{
struct ib_ucm_file *file = filp->private_data;
struct ib_ucm_cmd_hdr hdr;
ssize_t result;
if (!ib_safe_file_access(filp)) {
pr_err_once("ucm_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
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(ucm_cmd_table))
return -EINVAL;
if (hdr.in + sizeof(hdr) > len)
return -EINVAL;
result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
hdr.in, hdr.out);
if (!result)
result = len;
return result;
}
static unsigned int ib_ucm_poll(struct file *filp,
struct poll_table_struct *wait)
{
struct ib_ucm_file *file = filp->private_data;
unsigned int mask = 0;
poll_wait(filp, &file->poll_wait, wait);
if (!list_empty(&file->events))
mask = POLLIN | POLLRDNORM;
return mask;
}
/*
* ib_ucm_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 ib_ucm_open(struct inode *inode, struct file *filp)
{
struct ib_ucm_file *file;
file = kmalloc(sizeof(*file), GFP_KERNEL);
if (!file)
return -ENOMEM;
INIT_LIST_HEAD(&file->events);
INIT_LIST_HEAD(&file->ctxs);
init_waitqueue_head(&file->poll_wait);
mutex_init(&file->file_mutex);
filp->private_data = file;
file->filp = filp;
file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
return nonseekable_open(inode, filp);
}
static int ib_ucm_close(struct inode *inode, struct file *filp)
{
struct ib_ucm_file *file = filp->private_data;
struct ib_ucm_context *ctx;
mutex_lock(&file->file_mutex);
while (!list_empty(&file->ctxs)) {
ctx = list_entry(file->ctxs.next,
struct ib_ucm_context, file_list);
mutex_unlock(&file->file_mutex);
mutex_lock(&ctx_id_mutex);
idr_remove(&ctx_id_table, ctx->id);
mutex_unlock(&ctx_id_mutex);
ib_destroy_cm_id(ctx->cm_id);
ib_ucm_cleanup_events(ctx);
kfree(ctx);
mutex_lock(&file->file_mutex);
}
mutex_unlock(&file->file_mutex);
kfree(file);
return 0;
}
static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
static void ib_ucm_release_dev(struct device *dev)
{
struct ib_ucm_device *ucm_dev;
ucm_dev = container_of(dev, struct ib_ucm_device, dev);
cdev_del(&ucm_dev->cdev);
if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
clear_bit(ucm_dev->devnum, dev_map);
else
clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, overflow_map);
kfree(ucm_dev);
}
static const struct file_operations ucm_fops = {
.owner = THIS_MODULE,
.open = ib_ucm_open,
.release = ib_ucm_close,
.write = ib_ucm_write,
.poll = ib_ucm_poll,
.llseek = no_llseek,
};
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ib_ucm_device *ucm_dev;
ucm_dev = container_of(dev, struct ib_ucm_device, dev);
return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
}
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
static dev_t overflow_maj;
static int find_overflow_devnum(void)
{
int ret;
if (!overflow_maj) {
ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
"infiniband_cm");
if (ret) {
pr_err("ucm: couldn't register dynamic device number\n");
return ret;
}
}
ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
if (ret >= IB_UCM_MAX_DEVICES)
return -1;
return ret;
}
static void ib_ucm_add_one(struct ib_device *device)
{
int devnum;
dev_t base;
struct ib_ucm_device *ucm_dev;
if (!device->alloc_ucontext || !rdma_cap_ib_cm(device, 1))
return;
ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
if (!ucm_dev)
return;
ucm_dev->ib_dev = device;
devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
if (devnum >= IB_UCM_MAX_DEVICES) {
devnum = find_overflow_devnum();
if (devnum < 0)
goto err;
ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
base = devnum + overflow_maj;
set_bit(devnum, overflow_map);
} else {
ucm_dev->devnum = devnum;
base = devnum + IB_UCM_BASE_DEV;
set_bit(devnum, dev_map);
}
cdev_init(&ucm_dev->cdev, &ucm_fops);
ucm_dev->cdev.owner = THIS_MODULE;
kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
if (cdev_add(&ucm_dev->cdev, base, 1))
goto err;
ucm_dev->dev.class = &cm_class;
ucm_dev->dev.parent = device->dma_device;
ucm_dev->dev.devt = ucm_dev->cdev.dev;
ucm_dev->dev.release = ib_ucm_release_dev;
dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
if (device_register(&ucm_dev->dev))
goto err_cdev;
if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
goto err_dev;
ib_set_client_data(device, &ucm_client, ucm_dev);
return;
err_dev:
device_unregister(&ucm_dev->dev);
err_cdev:
cdev_del(&ucm_dev->cdev);
if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
clear_bit(devnum, dev_map);
else
clear_bit(devnum, overflow_map);
err:
kfree(ucm_dev);
return;
}
static void ib_ucm_remove_one(struct ib_device *device, void *client_data)
{
struct ib_ucm_device *ucm_dev = client_data;
if (!ucm_dev)
return;
device_unregister(&ucm_dev->dev);
}
static CLASS_ATTR_STRING(abi_version, S_IRUGO,
__stringify(IB_USER_CM_ABI_VERSION));
static int __init ib_ucm_init(void)
{
int ret;
ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
"infiniband_cm");
if (ret) {
pr_err("ucm: couldn't register device number\n");
goto error1;
}
ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
if (ret) {
pr_err("ucm: couldn't create abi_version attribute\n");
goto error2;
}
ret = ib_register_client(&ucm_client);
if (ret) {
pr_err("ucm: couldn't register client\n");
goto error3;
}
return 0;
error3:
class_remove_file(&cm_class, &class_attr_abi_version.attr);
error2:
unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
error1:
return ret;
}
static void __exit ib_ucm_cleanup(void)
{
ib_unregister_client(&ucm_client);
class_remove_file(&cm_class, &class_attr_abi_version.attr);
unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
if (overflow_maj)
unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
idr_destroy(&ctx_id_table);
}
module_init(ib_ucm_init);
module_exit(ib_ucm_cleanup);