1033 lines
29 KiB
C
1033 lines
29 KiB
C
/*
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* Copyright (c) 2004, 2005 Intel Corporation. All rights reserved.
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* Copyright (c) 2004 Topspin Corporation. All rights reserved.
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* Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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* Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
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* Copyright (c) 2005 Network Appliance, Inc. 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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*/
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/idr.h>
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#include <linux/interrupt.h>
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#include <linux/rbtree.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/completion.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <rdma/iw_cm.h>
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#include <rdma/ib_addr.h>
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#include "iwcm.h"
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MODULE_AUTHOR("Tom Tucker");
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MODULE_DESCRIPTION("iWARP CM");
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MODULE_LICENSE("Dual BSD/GPL");
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static struct workqueue_struct *iwcm_wq;
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struct iwcm_work {
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struct work_struct work;
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struct iwcm_id_private *cm_id;
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struct list_head list;
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struct iw_cm_event event;
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struct list_head free_list;
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};
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/*
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* The following services provide a mechanism for pre-allocating iwcm_work
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* elements. The design pre-allocates them based on the cm_id type:
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* LISTENING IDS: Get enough elements preallocated to handle the
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* listen backlog.
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* ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
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* PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE
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*
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* Allocating them in connect and listen avoids having to deal
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* with allocation failures on the event upcall from the provider (which
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* is called in the interrupt context).
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*
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* One exception is when creating the cm_id for incoming connection requests.
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* There are two cases:
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* 1) in the event upcall, cm_event_handler(), for a listening cm_id. If
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* the backlog is exceeded, then no more connection request events will
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* be processed. cm_event_handler() returns -ENOMEM in this case. Its up
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* to the provider to reject the connection request.
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* 2) in the connection request workqueue handler, cm_conn_req_handler().
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* If work elements cannot be allocated for the new connect request cm_id,
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* then IWCM will call the provider reject method. This is ok since
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* cm_conn_req_handler() runs in the workqueue thread context.
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*/
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static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
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{
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struct iwcm_work *work;
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if (list_empty(&cm_id_priv->work_free_list))
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return NULL;
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work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
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free_list);
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list_del_init(&work->free_list);
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return work;
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}
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static void put_work(struct iwcm_work *work)
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{
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list_add(&work->free_list, &work->cm_id->work_free_list);
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}
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static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
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{
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struct list_head *e, *tmp;
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list_for_each_safe(e, tmp, &cm_id_priv->work_free_list)
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kfree(list_entry(e, struct iwcm_work, free_list));
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}
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static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
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{
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struct iwcm_work *work;
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BUG_ON(!list_empty(&cm_id_priv->work_free_list));
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while (count--) {
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work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
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if (!work) {
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dealloc_work_entries(cm_id_priv);
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return -ENOMEM;
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}
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work->cm_id = cm_id_priv;
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INIT_LIST_HEAD(&work->list);
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put_work(work);
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}
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return 0;
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}
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/*
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* Save private data from incoming connection requests to
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* iw_cm_event, so the low level driver doesn't have to. Adjust
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* the event ptr to point to the local copy.
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*/
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static int copy_private_data(struct iw_cm_event *event)
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{
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void *p;
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p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
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if (!p)
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return -ENOMEM;
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event->private_data = p;
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return 0;
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}
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static void free_cm_id(struct iwcm_id_private *cm_id_priv)
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{
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dealloc_work_entries(cm_id_priv);
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kfree(cm_id_priv);
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}
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/*
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* Release a reference on cm_id. If the last reference is being
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* released, enable the waiting thread (in iw_destroy_cm_id) to
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* get woken up, and return 1 if a thread is already waiting.
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*/
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static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
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{
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BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
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if (atomic_dec_and_test(&cm_id_priv->refcount)) {
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BUG_ON(!list_empty(&cm_id_priv->work_list));
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complete(&cm_id_priv->destroy_comp);
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return 1;
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}
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return 0;
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}
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static void add_ref(struct iw_cm_id *cm_id)
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{
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struct iwcm_id_private *cm_id_priv;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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atomic_inc(&cm_id_priv->refcount);
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}
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static void rem_ref(struct iw_cm_id *cm_id)
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{
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struct iwcm_id_private *cm_id_priv;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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if (iwcm_deref_id(cm_id_priv) &&
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test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)) {
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BUG_ON(!list_empty(&cm_id_priv->work_list));
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free_cm_id(cm_id_priv);
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}
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}
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static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
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struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
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iw_cm_handler cm_handler,
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void *context)
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{
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struct iwcm_id_private *cm_id_priv;
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cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
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if (!cm_id_priv)
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return ERR_PTR(-ENOMEM);
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cm_id_priv->state = IW_CM_STATE_IDLE;
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cm_id_priv->id.device = device;
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cm_id_priv->id.cm_handler = cm_handler;
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cm_id_priv->id.context = context;
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cm_id_priv->id.event_handler = cm_event_handler;
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cm_id_priv->id.add_ref = add_ref;
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cm_id_priv->id.rem_ref = rem_ref;
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spin_lock_init(&cm_id_priv->lock);
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atomic_set(&cm_id_priv->refcount, 1);
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init_waitqueue_head(&cm_id_priv->connect_wait);
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init_completion(&cm_id_priv->destroy_comp);
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INIT_LIST_HEAD(&cm_id_priv->work_list);
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INIT_LIST_HEAD(&cm_id_priv->work_free_list);
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return &cm_id_priv->id;
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}
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EXPORT_SYMBOL(iw_create_cm_id);
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static int iwcm_modify_qp_err(struct ib_qp *qp)
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{
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struct ib_qp_attr qp_attr;
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if (!qp)
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return -EINVAL;
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qp_attr.qp_state = IB_QPS_ERR;
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return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
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}
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/*
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* This is really the RDMAC CLOSING state. It is most similar to the
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* IB SQD QP state.
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*/
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static int iwcm_modify_qp_sqd(struct ib_qp *qp)
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{
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struct ib_qp_attr qp_attr;
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BUG_ON(qp == NULL);
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qp_attr.qp_state = IB_QPS_SQD;
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return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
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}
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/*
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* CM_ID <-- CLOSING
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*
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* Block if a passive or active connection is currently being processed. Then
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* process the event as follows:
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* - If we are ESTABLISHED, move to CLOSING and modify the QP state
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* based on the abrupt flag
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* - If the connection is already in the CLOSING or IDLE state, the peer is
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* disconnecting concurrently with us and we've already seen the
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* DISCONNECT event -- ignore the request and return 0
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* - Disconnect on a listening endpoint returns -EINVAL
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*/
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int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
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{
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struct iwcm_id_private *cm_id_priv;
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unsigned long flags;
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int ret = 0;
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struct ib_qp *qp = NULL;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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/* Wait if we're currently in a connect or accept downcall */
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wait_event(cm_id_priv->connect_wait,
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!test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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switch (cm_id_priv->state) {
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case IW_CM_STATE_ESTABLISHED:
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cm_id_priv->state = IW_CM_STATE_CLOSING;
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/* QP could be <nul> for user-mode client */
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if (cm_id_priv->qp)
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qp = cm_id_priv->qp;
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else
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ret = -EINVAL;
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break;
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case IW_CM_STATE_LISTEN:
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ret = -EINVAL;
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break;
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case IW_CM_STATE_CLOSING:
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/* remote peer closed first */
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case IW_CM_STATE_IDLE:
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/* accept or connect returned !0 */
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break;
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case IW_CM_STATE_CONN_RECV:
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/*
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* App called disconnect before/without calling accept after
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* connect_request event delivered.
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*/
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break;
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case IW_CM_STATE_CONN_SENT:
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/* Can only get here if wait above fails */
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default:
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BUG();
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}
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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if (qp) {
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if (abrupt)
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ret = iwcm_modify_qp_err(qp);
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else
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ret = iwcm_modify_qp_sqd(qp);
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/*
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* If both sides are disconnecting the QP could
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* already be in ERR or SQD states
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*/
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ret = 0;
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}
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return ret;
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}
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EXPORT_SYMBOL(iw_cm_disconnect);
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/*
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* CM_ID <-- DESTROYING
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*
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* Clean up all resources associated with the connection and release
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* the initial reference taken by iw_create_cm_id.
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*/
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static void destroy_cm_id(struct iw_cm_id *cm_id)
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{
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struct iwcm_id_private *cm_id_priv;
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unsigned long flags;
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int ret;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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/*
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* Wait if we're currently in a connect or accept downcall. A
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* listening endpoint should never block here.
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*/
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wait_event(cm_id_priv->connect_wait,
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!test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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switch (cm_id_priv->state) {
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case IW_CM_STATE_LISTEN:
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cm_id_priv->state = IW_CM_STATE_DESTROYING;
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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/* destroy the listening endpoint */
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ret = cm_id->device->iwcm->destroy_listen(cm_id);
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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break;
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case IW_CM_STATE_ESTABLISHED:
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cm_id_priv->state = IW_CM_STATE_DESTROYING;
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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/* Abrupt close of the connection */
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(void)iwcm_modify_qp_err(cm_id_priv->qp);
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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break;
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case IW_CM_STATE_IDLE:
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case IW_CM_STATE_CLOSING:
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cm_id_priv->state = IW_CM_STATE_DESTROYING;
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break;
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case IW_CM_STATE_CONN_RECV:
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/*
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* App called destroy before/without calling accept after
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* receiving connection request event notification or
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* returned non zero from the event callback function.
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* In either case, must tell the provider to reject.
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*/
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cm_id_priv->state = IW_CM_STATE_DESTROYING;
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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cm_id->device->iwcm->reject(cm_id, NULL, 0);
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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break;
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case IW_CM_STATE_CONN_SENT:
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case IW_CM_STATE_DESTROYING:
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default:
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BUG();
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break;
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}
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if (cm_id_priv->qp) {
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cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
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cm_id_priv->qp = NULL;
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}
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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(void)iwcm_deref_id(cm_id_priv);
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}
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/*
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* This function is only called by the application thread and cannot
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* be called by the event thread. The function will wait for all
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* references to be released on the cm_id and then kfree the cm_id
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* object.
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*/
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void iw_destroy_cm_id(struct iw_cm_id *cm_id)
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{
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struct iwcm_id_private *cm_id_priv;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags));
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destroy_cm_id(cm_id);
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wait_for_completion(&cm_id_priv->destroy_comp);
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free_cm_id(cm_id_priv);
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}
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EXPORT_SYMBOL(iw_destroy_cm_id);
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/*
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* CM_ID <-- LISTEN
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*
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* Start listening for connect requests. Generates one CONNECT_REQUEST
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* event for each inbound connect request.
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*/
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int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
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{
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struct iwcm_id_private *cm_id_priv;
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unsigned long flags;
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int ret;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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ret = alloc_work_entries(cm_id_priv, backlog);
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if (ret)
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return ret;
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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switch (cm_id_priv->state) {
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case IW_CM_STATE_IDLE:
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cm_id_priv->state = IW_CM_STATE_LISTEN;
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
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if (ret)
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cm_id_priv->state = IW_CM_STATE_IDLE;
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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break;
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default:
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ret = -EINVAL;
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}
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(iw_cm_listen);
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/*
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* CM_ID <-- IDLE
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*
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* Rejects an inbound connection request. No events are generated.
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*/
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int iw_cm_reject(struct iw_cm_id *cm_id,
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const void *private_data,
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u8 private_data_len)
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{
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struct iwcm_id_private *cm_id_priv;
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unsigned long flags;
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int ret;
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
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wake_up_all(&cm_id_priv->connect_wait);
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return -EINVAL;
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}
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cm_id_priv->state = IW_CM_STATE_IDLE;
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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ret = cm_id->device->iwcm->reject(cm_id, private_data,
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private_data_len);
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clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
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wake_up_all(&cm_id_priv->connect_wait);
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return ret;
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}
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EXPORT_SYMBOL(iw_cm_reject);
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/*
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|
* CM_ID <-- ESTABLISHED
|
|
*
|
|
* Accepts an inbound connection request and generates an ESTABLISHED
|
|
* event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
|
|
* until the ESTABLISHED event is received from the provider.
|
|
*/
|
|
int iw_cm_accept(struct iw_cm_id *cm_id,
|
|
struct iw_cm_conn_param *iw_param)
|
|
{
|
|
struct iwcm_id_private *cm_id_priv;
|
|
struct ib_qp *qp;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
|
|
set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
return -EINVAL;
|
|
}
|
|
/* Get the ib_qp given the QPN */
|
|
qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
|
|
if (!qp) {
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
return -EINVAL;
|
|
}
|
|
cm_id->device->iwcm->add_ref(qp);
|
|
cm_id_priv->qp = qp;
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
|
|
ret = cm_id->device->iwcm->accept(cm_id, iw_param);
|
|
if (ret) {
|
|
/* An error on accept precludes provider events */
|
|
BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
|
|
cm_id_priv->state = IW_CM_STATE_IDLE;
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
if (cm_id_priv->qp) {
|
|
cm_id->device->iwcm->rem_ref(qp);
|
|
cm_id_priv->qp = NULL;
|
|
}
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iw_cm_accept);
|
|
|
|
/*
|
|
* Active Side: CM_ID <-- CONN_SENT
|
|
*
|
|
* If successful, results in the generation of a CONNECT_REPLY
|
|
* event. iw_cm_disconnect and iw_cm_destroy will block until the
|
|
* CONNECT_REPLY event is received from the provider.
|
|
*/
|
|
int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
|
|
{
|
|
struct iwcm_id_private *cm_id_priv;
|
|
int ret;
|
|
unsigned long flags;
|
|
struct ib_qp *qp;
|
|
|
|
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
|
|
|
|
ret = alloc_work_entries(cm_id_priv, 4);
|
|
if (ret)
|
|
return ret;
|
|
|
|
set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
|
|
if (cm_id_priv->state != IW_CM_STATE_IDLE) {
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Get the ib_qp given the QPN */
|
|
qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
|
|
if (!qp) {
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
return -EINVAL;
|
|
}
|
|
cm_id->device->iwcm->add_ref(qp);
|
|
cm_id_priv->qp = qp;
|
|
cm_id_priv->state = IW_CM_STATE_CONN_SENT;
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
|
|
ret = cm_id->device->iwcm->connect(cm_id, iw_param);
|
|
if (ret) {
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
if (cm_id_priv->qp) {
|
|
cm_id->device->iwcm->rem_ref(qp);
|
|
cm_id_priv->qp = NULL;
|
|
}
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
|
|
cm_id_priv->state = IW_CM_STATE_IDLE;
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iw_cm_connect);
|
|
|
|
/*
|
|
* Passive Side: new CM_ID <-- CONN_RECV
|
|
*
|
|
* Handles an inbound connect request. The function creates a new
|
|
* iw_cm_id to represent the new connection and inherits the client
|
|
* callback function and other attributes from the listening parent.
|
|
*
|
|
* The work item contains a pointer to the listen_cm_id and the event. The
|
|
* listen_cm_id contains the client cm_handler, context and
|
|
* device. These are copied when the device is cloned. The event
|
|
* contains the new four tuple.
|
|
*
|
|
* An error on the child should not affect the parent, so this
|
|
* function does not return a value.
|
|
*/
|
|
static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
unsigned long flags;
|
|
struct iw_cm_id *cm_id;
|
|
struct iwcm_id_private *cm_id_priv;
|
|
int ret;
|
|
|
|
/*
|
|
* The provider should never generate a connection request
|
|
* event with a bad status.
|
|
*/
|
|
BUG_ON(iw_event->status);
|
|
|
|
/*
|
|
* We could be destroying the listening id. If so, ignore this
|
|
* upcall.
|
|
*/
|
|
spin_lock_irqsave(&listen_id_priv->lock, flags);
|
|
if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
|
|
spin_unlock_irqrestore(&listen_id_priv->lock, flags);
|
|
goto out;
|
|
}
|
|
spin_unlock_irqrestore(&listen_id_priv->lock, flags);
|
|
|
|
cm_id = iw_create_cm_id(listen_id_priv->id.device,
|
|
listen_id_priv->id.cm_handler,
|
|
listen_id_priv->id.context);
|
|
/* If the cm_id could not be created, ignore the request */
|
|
if (IS_ERR(cm_id))
|
|
goto out;
|
|
|
|
cm_id->provider_data = iw_event->provider_data;
|
|
cm_id->local_addr = iw_event->local_addr;
|
|
cm_id->remote_addr = iw_event->remote_addr;
|
|
|
|
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
|
|
cm_id_priv->state = IW_CM_STATE_CONN_RECV;
|
|
|
|
ret = alloc_work_entries(cm_id_priv, 3);
|
|
if (ret) {
|
|
iw_cm_reject(cm_id, NULL, 0);
|
|
iw_destroy_cm_id(cm_id);
|
|
goto out;
|
|
}
|
|
|
|
/* Call the client CM handler */
|
|
ret = cm_id->cm_handler(cm_id, iw_event);
|
|
if (ret) {
|
|
iw_cm_reject(cm_id, NULL, 0);
|
|
set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
|
|
destroy_cm_id(cm_id);
|
|
if (atomic_read(&cm_id_priv->refcount)==0)
|
|
free_cm_id(cm_id_priv);
|
|
}
|
|
|
|
out:
|
|
if (iw_event->private_data_len)
|
|
kfree(iw_event->private_data);
|
|
}
|
|
|
|
/*
|
|
* Passive Side: CM_ID <-- ESTABLISHED
|
|
*
|
|
* The provider generated an ESTABLISHED event which means that
|
|
* the MPA negotion has completed successfully and we are now in MPA
|
|
* FPDU mode.
|
|
*
|
|
* This event can only be received in the CONN_RECV state. If the
|
|
* remote peer closed, the ESTABLISHED event would be received followed
|
|
* by the CLOSE event. If the app closes, it will block until we wake
|
|
* it up after processing this event.
|
|
*/
|
|
static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
|
|
/*
|
|
* We clear the CONNECT_WAIT bit here to allow the callback
|
|
* function to call iw_cm_disconnect. Calling iw_destroy_cm_id
|
|
* from a callback handler is not allowed.
|
|
*/
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
|
|
cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Active Side: CM_ID <-- ESTABLISHED
|
|
*
|
|
* The app has called connect and is waiting for the established event to
|
|
* post it's requests to the server. This event will wake up anyone
|
|
* blocked in iw_cm_disconnect or iw_destroy_id.
|
|
*/
|
|
static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
/*
|
|
* Clear the connect wait bit so a callback function calling
|
|
* iw_cm_disconnect will not wait and deadlock this thread
|
|
*/
|
|
clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
|
|
BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
|
|
if (iw_event->status == 0) {
|
|
cm_id_priv->id.local_addr = iw_event->local_addr;
|
|
cm_id_priv->id.remote_addr = iw_event->remote_addr;
|
|
cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
|
|
} else {
|
|
/* REJECTED or RESET */
|
|
cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
|
|
cm_id_priv->qp = NULL;
|
|
cm_id_priv->state = IW_CM_STATE_IDLE;
|
|
}
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
|
|
|
|
if (iw_event->private_data_len)
|
|
kfree(iw_event->private_data);
|
|
|
|
/* Wake up waiters on connect complete */
|
|
wake_up_all(&cm_id_priv->connect_wait);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* CM_ID <-- CLOSING
|
|
*
|
|
* If in the ESTABLISHED state, move to CLOSING.
|
|
*/
|
|
static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
|
|
cm_id_priv->state = IW_CM_STATE_CLOSING;
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* CM_ID <-- IDLE
|
|
*
|
|
* If in the ESTBLISHED or CLOSING states, the QP will have have been
|
|
* moved by the provider to the ERR state. Disassociate the CM_ID from
|
|
* the QP, move to IDLE, and remove the 'connected' reference.
|
|
*
|
|
* If in some other state, the cm_id was destroyed asynchronously.
|
|
* This is the last reference that will result in waking up
|
|
* the app thread blocked in iw_destroy_cm_id.
|
|
*/
|
|
static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
|
|
if (cm_id_priv->qp) {
|
|
cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
|
|
cm_id_priv->qp = NULL;
|
|
}
|
|
switch (cm_id_priv->state) {
|
|
case IW_CM_STATE_ESTABLISHED:
|
|
case IW_CM_STATE_CLOSING:
|
|
cm_id_priv->state = IW_CM_STATE_IDLE;
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
break;
|
|
case IW_CM_STATE_DESTROYING:
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int process_event(struct iwcm_id_private *cm_id_priv,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (iw_event->event) {
|
|
case IW_CM_EVENT_CONNECT_REQUEST:
|
|
cm_conn_req_handler(cm_id_priv, iw_event);
|
|
break;
|
|
case IW_CM_EVENT_CONNECT_REPLY:
|
|
ret = cm_conn_rep_handler(cm_id_priv, iw_event);
|
|
break;
|
|
case IW_CM_EVENT_ESTABLISHED:
|
|
ret = cm_conn_est_handler(cm_id_priv, iw_event);
|
|
break;
|
|
case IW_CM_EVENT_DISCONNECT:
|
|
cm_disconnect_handler(cm_id_priv, iw_event);
|
|
break;
|
|
case IW_CM_EVENT_CLOSE:
|
|
ret = cm_close_handler(cm_id_priv, iw_event);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Process events on the work_list for the cm_id. If the callback
|
|
* function requests that the cm_id be deleted, a flag is set in the
|
|
* cm_id flags to indicate that when the last reference is
|
|
* removed, the cm_id is to be destroyed. This is necessary to
|
|
* distinguish between an object that will be destroyed by the app
|
|
* thread asleep on the destroy_comp list vs. an object destroyed
|
|
* here synchronously when the last reference is removed.
|
|
*/
|
|
static void cm_work_handler(struct work_struct *_work)
|
|
{
|
|
struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
|
|
struct iw_cm_event levent;
|
|
struct iwcm_id_private *cm_id_priv = work->cm_id;
|
|
unsigned long flags;
|
|
int empty;
|
|
int ret = 0;
|
|
int destroy_id;
|
|
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
empty = list_empty(&cm_id_priv->work_list);
|
|
while (!empty) {
|
|
work = list_entry(cm_id_priv->work_list.next,
|
|
struct iwcm_work, list);
|
|
list_del_init(&work->list);
|
|
empty = list_empty(&cm_id_priv->work_list);
|
|
levent = work->event;
|
|
put_work(work);
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
|
|
ret = process_event(cm_id_priv, &levent);
|
|
if (ret) {
|
|
set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
|
|
destroy_cm_id(&cm_id_priv->id);
|
|
}
|
|
BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
|
|
destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
|
|
if (iwcm_deref_id(cm_id_priv)) {
|
|
if (destroy_id) {
|
|
BUG_ON(!list_empty(&cm_id_priv->work_list));
|
|
free_cm_id(cm_id_priv);
|
|
}
|
|
return;
|
|
}
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* This function is called on interrupt context. Schedule events on
|
|
* the iwcm_wq thread to allow callback functions to downcall into
|
|
* the CM and/or block. Events are queued to a per-CM_ID
|
|
* work_list. If this is the first event on the work_list, the work
|
|
* element is also queued on the iwcm_wq thread.
|
|
*
|
|
* Each event holds a reference on the cm_id. Until the last posted
|
|
* event has been delivered and processed, the cm_id cannot be
|
|
* deleted.
|
|
*
|
|
* Returns:
|
|
* 0 - the event was handled.
|
|
* -ENOMEM - the event was not handled due to lack of resources.
|
|
*/
|
|
static int cm_event_handler(struct iw_cm_id *cm_id,
|
|
struct iw_cm_event *iw_event)
|
|
{
|
|
struct iwcm_work *work;
|
|
struct iwcm_id_private *cm_id_priv;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
|
|
|
|
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
|
work = get_work(cm_id_priv);
|
|
if (!work) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
INIT_WORK(&work->work, cm_work_handler);
|
|
work->cm_id = cm_id_priv;
|
|
work->event = *iw_event;
|
|
|
|
if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
|
|
work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
|
|
work->event.private_data_len) {
|
|
ret = copy_private_data(&work->event);
|
|
if (ret) {
|
|
put_work(work);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
atomic_inc(&cm_id_priv->refcount);
|
|
if (list_empty(&cm_id_priv->work_list)) {
|
|
list_add_tail(&work->list, &cm_id_priv->work_list);
|
|
queue_work(iwcm_wq, &work->work);
|
|
} else
|
|
list_add_tail(&work->list, &cm_id_priv->work_list);
|
|
out:
|
|
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
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struct ib_qp_attr *qp_attr,
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int *qp_attr_mask)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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switch (cm_id_priv->state) {
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case IW_CM_STATE_IDLE:
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case IW_CM_STATE_CONN_SENT:
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case IW_CM_STATE_CONN_RECV:
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case IW_CM_STATE_ESTABLISHED:
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*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
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qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
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IB_ACCESS_REMOTE_READ;
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ret = 0;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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return ret;
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}
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static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
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struct ib_qp_attr *qp_attr,
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int *qp_attr_mask)
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{
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unsigned long flags;
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int ret;
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|
|
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spin_lock_irqsave(&cm_id_priv->lock, flags);
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switch (cm_id_priv->state) {
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case IW_CM_STATE_IDLE:
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case IW_CM_STATE_CONN_SENT:
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case IW_CM_STATE_CONN_RECV:
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case IW_CM_STATE_ESTABLISHED:
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*qp_attr_mask = 0;
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ret = 0;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock_irqrestore(&cm_id_priv->lock, flags);
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return ret;
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}
|
|
|
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int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
|
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struct ib_qp_attr *qp_attr,
|
|
int *qp_attr_mask)
|
|
{
|
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struct iwcm_id_private *cm_id_priv;
|
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int ret;
|
|
|
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cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
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switch (qp_attr->qp_state) {
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case IB_QPS_INIT:
|
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case IB_QPS_RTR:
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ret = iwcm_init_qp_init_attr(cm_id_priv,
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qp_attr, qp_attr_mask);
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break;
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case IB_QPS_RTS:
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ret = iwcm_init_qp_rts_attr(cm_id_priv,
|
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qp_attr, qp_attr_mask);
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break;
|
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default:
|
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ret = -EINVAL;
|
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break;
|
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}
|
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return ret;
|
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}
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EXPORT_SYMBOL(iw_cm_init_qp_attr);
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|
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static int __init iw_cm_init(void)
|
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{
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iwcm_wq = create_singlethread_workqueue("iw_cm_wq");
|
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if (!iwcm_wq)
|
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return -ENOMEM;
|
|
|
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return 0;
|
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}
|
|
|
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static void __exit iw_cm_cleanup(void)
|
|
{
|
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destroy_workqueue(iwcm_wq);
|
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}
|
|
|
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module_init(iw_cm_init);
|
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module_exit(iw_cm_cleanup);
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