![Julien Brunel](/assets/img/avatar_default.png)
In case of error, the function ucma_alloc_multicast() returns a NULL pointer, but never returns an ERR pointer. So after a call to this function, an IS_ERR test should be replaced by a NULL test. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @match bad_is_err_test@ expression x, E; @@ x = ucma_alloc_multicast(...) ... when != x = E IS_ERR(x) // </smpl> Signed-off-by: Julien Brunel <brunel@diku.dk> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Roland Dreier <rolandd@cisco.com>
1246 lines
28 KiB
C
1246 lines
28 KiB
C
/*
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* Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/completion.h>
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#include <linux/file.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/idr.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/miscdevice.h>
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#include <rdma/rdma_user_cm.h>
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#include <rdma/ib_marshall.h>
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#include <rdma/rdma_cm.h>
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MODULE_AUTHOR("Sean Hefty");
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MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
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MODULE_LICENSE("Dual BSD/GPL");
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enum {
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UCMA_MAX_BACKLOG = 128
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};
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struct ucma_file {
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struct mutex mut;
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struct file *filp;
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struct list_head ctx_list;
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struct list_head event_list;
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wait_queue_head_t poll_wait;
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};
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struct ucma_context {
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int id;
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struct completion comp;
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atomic_t ref;
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int events_reported;
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int backlog;
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struct ucma_file *file;
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struct rdma_cm_id *cm_id;
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u64 uid;
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struct list_head list;
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struct list_head mc_list;
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};
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struct ucma_multicast {
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struct ucma_context *ctx;
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int id;
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int events_reported;
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u64 uid;
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struct list_head list;
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struct sockaddr_storage addr;
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};
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struct ucma_event {
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struct ucma_context *ctx;
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struct ucma_multicast *mc;
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struct list_head list;
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struct rdma_cm_id *cm_id;
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struct rdma_ucm_event_resp resp;
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};
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static DEFINE_MUTEX(mut);
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static DEFINE_IDR(ctx_idr);
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static DEFINE_IDR(multicast_idr);
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static inline struct ucma_context *_ucma_find_context(int id,
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struct ucma_file *file)
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{
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struct ucma_context *ctx;
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ctx = idr_find(&ctx_idr, id);
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if (!ctx)
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ctx = ERR_PTR(-ENOENT);
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else if (ctx->file != file)
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ctx = ERR_PTR(-EINVAL);
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return ctx;
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}
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static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
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{
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struct ucma_context *ctx;
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mutex_lock(&mut);
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ctx = _ucma_find_context(id, file);
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if (!IS_ERR(ctx))
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atomic_inc(&ctx->ref);
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mutex_unlock(&mut);
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return ctx;
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}
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static void ucma_put_ctx(struct ucma_context *ctx)
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{
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if (atomic_dec_and_test(&ctx->ref))
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complete(&ctx->comp);
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}
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static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
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{
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struct ucma_context *ctx;
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int ret;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return NULL;
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atomic_set(&ctx->ref, 1);
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init_completion(&ctx->comp);
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INIT_LIST_HEAD(&ctx->mc_list);
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ctx->file = file;
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do {
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ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
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if (!ret)
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goto error;
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mutex_lock(&mut);
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ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
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mutex_unlock(&mut);
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} while (ret == -EAGAIN);
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if (ret)
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goto error;
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list_add_tail(&ctx->list, &file->ctx_list);
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return ctx;
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error:
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kfree(ctx);
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return NULL;
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}
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static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
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{
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struct ucma_multicast *mc;
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int ret;
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mc = kzalloc(sizeof(*mc), GFP_KERNEL);
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if (!mc)
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return NULL;
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do {
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ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
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if (!ret)
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goto error;
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mutex_lock(&mut);
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ret = idr_get_new(&multicast_idr, mc, &mc->id);
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mutex_unlock(&mut);
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} while (ret == -EAGAIN);
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if (ret)
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goto error;
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mc->ctx = ctx;
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list_add_tail(&mc->list, &ctx->mc_list);
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return mc;
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error:
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kfree(mc);
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return NULL;
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}
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static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
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struct rdma_conn_param *src)
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{
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if (src->private_data_len)
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memcpy(dst->private_data, src->private_data,
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src->private_data_len);
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dst->private_data_len = src->private_data_len;
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dst->responder_resources =src->responder_resources;
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dst->initiator_depth = src->initiator_depth;
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dst->flow_control = src->flow_control;
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dst->retry_count = src->retry_count;
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dst->rnr_retry_count = src->rnr_retry_count;
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dst->srq = src->srq;
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dst->qp_num = src->qp_num;
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}
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static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
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struct rdma_ud_param *src)
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{
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if (src->private_data_len)
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memcpy(dst->private_data, src->private_data,
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src->private_data_len);
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dst->private_data_len = src->private_data_len;
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ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
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dst->qp_num = src->qp_num;
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dst->qkey = src->qkey;
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}
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static void ucma_set_event_context(struct ucma_context *ctx,
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struct rdma_cm_event *event,
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struct ucma_event *uevent)
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{
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uevent->ctx = ctx;
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switch (event->event) {
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case RDMA_CM_EVENT_MULTICAST_JOIN:
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case RDMA_CM_EVENT_MULTICAST_ERROR:
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uevent->mc = (struct ucma_multicast *)
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event->param.ud.private_data;
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uevent->resp.uid = uevent->mc->uid;
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uevent->resp.id = uevent->mc->id;
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break;
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default:
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uevent->resp.uid = ctx->uid;
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uevent->resp.id = ctx->id;
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break;
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}
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}
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static int ucma_event_handler(struct rdma_cm_id *cm_id,
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struct rdma_cm_event *event)
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{
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struct ucma_event *uevent;
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struct ucma_context *ctx = cm_id->context;
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int ret = 0;
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uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
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if (!uevent)
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return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
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uevent->cm_id = cm_id;
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ucma_set_event_context(ctx, event, uevent);
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uevent->resp.event = event->event;
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uevent->resp.status = event->status;
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if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
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ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
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else
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ucma_copy_conn_event(&uevent->resp.param.conn,
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&event->param.conn);
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mutex_lock(&ctx->file->mut);
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if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
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if (!ctx->backlog) {
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ret = -ENOMEM;
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kfree(uevent);
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goto out;
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}
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ctx->backlog--;
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} else if (!ctx->uid) {
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/*
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* We ignore events for new connections until userspace has set
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* their context. This can only happen if an error occurs on a
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* new connection before the user accepts it. This is okay,
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* since the accept will just fail later.
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*/
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kfree(uevent);
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goto out;
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}
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list_add_tail(&uevent->list, &ctx->file->event_list);
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wake_up_interruptible(&ctx->file->poll_wait);
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out:
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mutex_unlock(&ctx->file->mut);
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return ret;
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}
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static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
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int in_len, int out_len)
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{
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struct ucma_context *ctx;
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struct rdma_ucm_get_event cmd;
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struct ucma_event *uevent;
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int ret = 0;
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DEFINE_WAIT(wait);
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if (out_len < sizeof uevent->resp)
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return -ENOSPC;
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if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
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return -EFAULT;
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mutex_lock(&file->mut);
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while (list_empty(&file->event_list)) {
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mutex_unlock(&file->mut);
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if (file->filp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (wait_event_interruptible(file->poll_wait,
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!list_empty(&file->event_list)))
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return -ERESTARTSYS;
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mutex_lock(&file->mut);
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}
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uevent = list_entry(file->event_list.next, struct ucma_event, list);
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if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
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ctx = ucma_alloc_ctx(file);
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if (!ctx) {
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ret = -ENOMEM;
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goto done;
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}
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uevent->ctx->backlog++;
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ctx->cm_id = uevent->cm_id;
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ctx->cm_id->context = ctx;
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uevent->resp.id = ctx->id;
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}
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if (copy_to_user((void __user *)(unsigned long)cmd.response,
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&uevent->resp, sizeof uevent->resp)) {
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ret = -EFAULT;
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goto done;
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}
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list_del(&uevent->list);
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uevent->ctx->events_reported++;
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if (uevent->mc)
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uevent->mc->events_reported++;
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kfree(uevent);
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done:
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mutex_unlock(&file->mut);
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return ret;
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}
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static ssize_t ucma_create_id(struct ucma_file *file,
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const char __user *inbuf,
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int in_len, int out_len)
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{
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struct rdma_ucm_create_id cmd;
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struct rdma_ucm_create_id_resp resp;
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struct ucma_context *ctx;
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int ret;
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if (out_len < sizeof(resp))
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return -ENOSPC;
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if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
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return -EFAULT;
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mutex_lock(&file->mut);
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ctx = ucma_alloc_ctx(file);
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mutex_unlock(&file->mut);
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if (!ctx)
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return -ENOMEM;
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ctx->uid = cmd.uid;
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ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
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if (IS_ERR(ctx->cm_id)) {
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ret = PTR_ERR(ctx->cm_id);
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goto err1;
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}
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resp.id = ctx->id;
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if (copy_to_user((void __user *)(unsigned long)cmd.response,
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&resp, sizeof(resp))) {
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ret = -EFAULT;
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goto err2;
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}
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return 0;
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err2:
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rdma_destroy_id(ctx->cm_id);
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err1:
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mutex_lock(&mut);
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idr_remove(&ctx_idr, ctx->id);
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mutex_unlock(&mut);
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kfree(ctx);
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return ret;
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}
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static void ucma_cleanup_multicast(struct ucma_context *ctx)
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{
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struct ucma_multicast *mc, *tmp;
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mutex_lock(&mut);
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list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
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list_del(&mc->list);
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idr_remove(&multicast_idr, mc->id);
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kfree(mc);
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}
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mutex_unlock(&mut);
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}
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static void ucma_cleanup_events(struct ucma_context *ctx)
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{
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struct ucma_event *uevent, *tmp;
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list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
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if (uevent->ctx != ctx)
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continue;
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list_del(&uevent->list);
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/* clear incoming connections. */
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if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
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rdma_destroy_id(uevent->cm_id);
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kfree(uevent);
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}
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}
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static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
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{
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struct ucma_event *uevent, *tmp;
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list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
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if (uevent->mc != mc)
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continue;
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list_del(&uevent->list);
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kfree(uevent);
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}
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}
|
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|
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static int ucma_free_ctx(struct ucma_context *ctx)
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{
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int events_reported;
|
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|
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/* No new events will be generated after destroying the id. */
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rdma_destroy_id(ctx->cm_id);
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|
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ucma_cleanup_multicast(ctx);
|
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|
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/* Cleanup events not yet reported to the user. */
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mutex_lock(&ctx->file->mut);
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ucma_cleanup_events(ctx);
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list_del(&ctx->list);
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mutex_unlock(&ctx->file->mut);
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|
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events_reported = ctx->events_reported;
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kfree(ctx);
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return events_reported;
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}
|
|
|
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static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
|
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int in_len, int out_len)
|
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{
|
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struct rdma_ucm_destroy_id cmd;
|
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struct rdma_ucm_destroy_id_resp resp;
|
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struct ucma_context *ctx;
|
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int ret = 0;
|
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|
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if (out_len < sizeof(resp))
|
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return -ENOSPC;
|
|
|
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if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
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return -EFAULT;
|
|
|
|
mutex_lock(&mut);
|
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ctx = _ucma_find_context(cmd.id, file);
|
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if (!IS_ERR(ctx))
|
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idr_remove(&ctx_idr, ctx->id);
|
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mutex_unlock(&mut);
|
|
|
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if (IS_ERR(ctx))
|
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return PTR_ERR(ctx);
|
|
|
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ucma_put_ctx(ctx);
|
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wait_for_completion(&ctx->comp);
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resp.events_reported = ucma_free_ctx(ctx);
|
|
|
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if (copy_to_user((void __user *)(unsigned long)cmd.response,
|
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&resp, sizeof(resp)))
|
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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;
|
|
|
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if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
|
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return -EFAULT;
|
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|
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ctx = ucma_get_ctx(file, cmd.id);
|
|
if (IS_ERR(ctx))
|
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return PTR_ERR(ctx);
|
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|
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ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
|
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ucma_put_ctx(ctx);
|
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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 = (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.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 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;
|
|
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:
|
|
ret = ucma_set_option_id(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;
|
|
|
|
ctx = ucma_get_ctx(file, cmd.id);
|
|
if (IS_ERR(ctx))
|
|
return PTR_ERR(ctx);
|
|
|
|
optval = kmalloc(cmd.optlen, GFP_KERNEL);
|
|
if (!optval) {
|
|
ret = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
|
|
cmd.optlen)) {
|
|
ret = -EFAULT;
|
|
goto out2;
|
|
}
|
|
|
|
ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
|
|
cmd.optlen);
|
|
out2:
|
|
kfree(optval);
|
|
out1:
|
|
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_join_multicast(struct ucma_file *file,
|
|
const char __user *inbuf,
|
|
int in_len, int out_len)
|
|
{
|
|
struct rdma_ucm_join_mcast cmd;
|
|
struct rdma_ucm_create_id_resp resp;
|
|
struct ucma_context *ctx;
|
|
struct ucma_multicast *mc;
|
|
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);
|
|
|
|
mutex_lock(&file->mut);
|
|
mc = ucma_alloc_multicast(ctx);
|
|
if (!mc) {
|
|
ret = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
mc->uid = cmd.uid;
|
|
memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
|
|
ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
|
|
if (ret)
|
|
goto err2;
|
|
|
|
resp.id = mc->id;
|
|
if (copy_to_user((void __user *)(unsigned long)cmd.response,
|
|
&resp, sizeof(resp))) {
|
|
ret = -EFAULT;
|
|
goto err3;
|
|
}
|
|
|
|
mutex_unlock(&file->mut);
|
|
ucma_put_ctx(ctx);
|
|
return 0;
|
|
|
|
err3:
|
|
rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
|
|
ucma_cleanup_mc_events(mc);
|
|
err2:
|
|
mutex_lock(&mut);
|
|
idr_remove(&multicast_idr, mc->id);
|
|
mutex_unlock(&mut);
|
|
list_del(&mc->list);
|
|
kfree(mc);
|
|
err1:
|
|
mutex_unlock(&file->mut);
|
|
ucma_put_ctx(ctx);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
mutex_lock(&mut);
|
|
mc = idr_find(&multicast_idr, cmd.id);
|
|
if (!mc)
|
|
mc = ERR_PTR(-ENOENT);
|
|
else if (mc->ctx->file != file)
|
|
mc = ERR_PTR(-EINVAL);
|
|
else {
|
|
idr_remove(&multicast_idr, mc->id);
|
|
atomic_inc(&mc->ctx->ref);
|
|
}
|
|
mutex_unlock(&mut);
|
|
|
|
if (IS_ERR(mc)) {
|
|
ret = PTR_ERR(mc);
|
|
goto out;
|
|
}
|
|
|
|
rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
|
|
mutex_lock(&mc->ctx->file->mut);
|
|
ucma_cleanup_mc_events(mc);
|
|
list_del(&mc->list);
|
|
mutex_unlock(&mc->ctx->file->mut);
|
|
|
|
ucma_put_ctx(mc->ctx);
|
|
resp.events_reported = mc->events_reported;
|
|
kfree(mc);
|
|
|
|
if (copy_to_user((void __user *)(unsigned long)cmd.response,
|
|
&resp, sizeof(resp)))
|
|
ret = -EFAULT;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
|
|
{
|
|
/* Acquire mutex's based on pointer comparison to prevent deadlock. */
|
|
if (file1 < file2) {
|
|
mutex_lock(&file1->mut);
|
|
mutex_lock(&file2->mut);
|
|
} else {
|
|
mutex_lock(&file2->mut);
|
|
mutex_lock(&file1->mut);
|
|
}
|
|
}
|
|
|
|
static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
|
|
{
|
|
if (file1 < file2) {
|
|
mutex_unlock(&file2->mut);
|
|
mutex_unlock(&file1->mut);
|
|
} else {
|
|
mutex_unlock(&file1->mut);
|
|
mutex_unlock(&file2->mut);
|
|
}
|
|
}
|
|
|
|
static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
|
|
{
|
|
struct ucma_event *uevent, *tmp;
|
|
|
|
list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
|
|
if (uevent->ctx == ctx)
|
|
list_move_tail(&uevent->list, &file->event_list);
|
|
}
|
|
|
|
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_context *ctx;
|
|
struct file *filp;
|
|
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 */
|
|
filp = fget(cmd.fd);
|
|
if (!filp)
|
|
return -ENOENT;
|
|
|
|
/* Validate current fd and prevent destruction of id. */
|
|
ctx = ucma_get_ctx(filp->private_data, cmd.id);
|
|
if (IS_ERR(ctx)) {
|
|
ret = PTR_ERR(ctx);
|
|
goto file_put;
|
|
}
|
|
|
|
cur_file = ctx->file;
|
|
if (cur_file == new_file) {
|
|
resp.events_reported = ctx->events_reported;
|
|
goto response;
|
|
}
|
|
|
|
/*
|
|
* Migrate events between fd's, maintaining order, and avoiding new
|
|
* events being added before existing events.
|
|
*/
|
|
ucma_lock_files(cur_file, new_file);
|
|
mutex_lock(&mut);
|
|
|
|
list_move_tail(&ctx->list, &new_file->ctx_list);
|
|
ucma_move_events(ctx, new_file);
|
|
ctx->file = new_file;
|
|
resp.events_reported = ctx->events_reported;
|
|
|
|
mutex_unlock(&mut);
|
|
ucma_unlock_files(cur_file, new_file);
|
|
|
|
response:
|
|
if (copy_to_user((void __user *)(unsigned long)cmd.response,
|
|
&resp, sizeof(resp)))
|
|
ret = -EFAULT;
|
|
|
|
ucma_put_ctx(ctx);
|
|
file_put:
|
|
fput(filp);
|
|
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] = ucma_set_option,
|
|
[RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
|
|
[RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
|
|
[RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
|
|
[RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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 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 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",
|
|
.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);
|