Orange Pi5 kernel

/*
 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
 * Copyright (c) 2005 Network Appliance, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/sysctl.h>
 
#include <rdma/iw_cm.h>
#include <rdma/ib_addr.h>
#include <rdma/iw_portmap.h>
#include <rdma/rdma_netlink.h>
 
#include "iwcm.h"
 
MODULE_AUTHOR("Tom Tucker");
MODULE_DESCRIPTION("iWARP CM");
MODULE_LICENSE("Dual BSD/GPL");
 
static const char * const iwcm_rej_reason_strs[] = {
<------>[ECONNRESET]			= "reset by remote host",
<------>[ECONNREFUSED]			= "refused by remote application",
<------>[ETIMEDOUT]			= "setup timeout",
};
 
const char *__attribute_const__ iwcm_reject_msg(int reason)
{
<------>size_t index;
 
<------>/* iWARP uses negative errnos */
<------>index = -reason;
 
<------>if (index < ARRAY_SIZE(iwcm_rej_reason_strs) &&
<------>    iwcm_rej_reason_strs[index])
<------><------>return iwcm_rej_reason_strs[index];
<------>else
<------><------>return "unrecognized reason";
}
EXPORT_SYMBOL(iwcm_reject_msg);
 
static struct rdma_nl_cbs iwcm_nl_cb_table[RDMA_NL_IWPM_NUM_OPS] = {
<------>[RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb},
<------>[RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb},
<------>[RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb},
<------>[RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb},
<------>[RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb},
<------>[RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb},
<------>[RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb},
<------>[RDMA_NL_IWPM_HELLO] = {.dump = iwpm_hello_cb}
};
 
static struct workqueue_struct *iwcm_wq;
struct iwcm_work {
<------>struct work_struct work;
<------>struct iwcm_id_private *cm_id;
<------>struct list_head list;
<------>struct iw_cm_event event;
<------>struct list_head free_list;
};
 
static unsigned int default_backlog = 256;
 
static struct ctl_table_header *iwcm_ctl_table_hdr;
static struct ctl_table iwcm_ctl_table[] = {
<------>{
<------><------>.procname	= "default_backlog",
<------><------>.data		= &default_backlog,
<------><------>.maxlen		= sizeof(default_backlog),
<------><------>.mode		= 0644,
<------><------>.proc_handler	= proc_dointvec,
<------>},
<------>{ }
};
 
/*
 * The following services provide a mechanism for pre-allocating iwcm_work
 * elements.  The design pre-allocates them  based on the cm_id type:
 *	LISTENING IDS: 	Get enough elements preallocated to handle the
 *			listen backlog.
 *	ACTIVE IDS:	4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
 *	PASSIVE IDS:	3: ESTABLISHED, DISCONNECT, CLOSE
 *
 * Allocating them in connect and listen avoids having to deal
 * with allocation failures on the event upcall from the provider (which
 * is called in the interrupt context).
 *
 * One exception is when creating the cm_id for incoming connection requests.
 * There are two cases:
 * 1) in the event upcall, cm_event_handler(), for a listening cm_id.  If
 *    the backlog is exceeded, then no more connection request events will
 *    be processed.  cm_event_handler() returns -ENOMEM in this case.  Its up
 *    to the provider to reject the connection request.
 * 2) in the connection request workqueue handler, cm_conn_req_handler().
 *    If work elements cannot be allocated for the new connect request cm_id,
 *    then IWCM will call the provider reject method.  This is ok since
 *    cm_conn_req_handler() runs in the workqueue thread context.
 */
 
static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
{
<------>struct iwcm_work *work;
 
<------>if (list_empty(&cm_id_priv->work_free_list))
<------><------>return NULL;
<------>work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work,
<------><------><------>  free_list);
<------>list_del_init(&work->free_list);
<------>return work;
}
 
static void put_work(struct iwcm_work *work)
{
<------>list_add(&work->free_list, &work->cm_id->work_free_list);
}
 
static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
{
<------>struct list_head *e, *tmp;
 
<------>list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) {
<------><------>list_del(e);
<------><------>kfree(list_entry(e, struct iwcm_work, free_list));
<------>}
}
 
static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
{
<------>struct iwcm_work *work;
 
<------>BUG_ON(!list_empty(&cm_id_priv->work_free_list));
<------>while (count--) {
<------><------>work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
<------><------>if (!work) {
<------><------><------>dealloc_work_entries(cm_id_priv);
<------><------><------>return -ENOMEM;
<------><------>}
<------><------>work->cm_id = cm_id_priv;
<------><------>INIT_LIST_HEAD(&work->list);
<------><------>put_work(work);
<------>}
<------>return 0;
}
 
/*
 * Save private data from incoming connection requests to
 * iw_cm_event, so the low level driver doesn't have to. Adjust
 * the event ptr to point to the local copy.
 */
static int copy_private_data(struct iw_cm_event *event)
{
<------>void *p;
 
<------>p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
<------>if (!p)
<------><------>return -ENOMEM;
<------>event->private_data = p;
<------>return 0;
}
 
static void free_cm_id(struct iwcm_id_private *cm_id_priv)
{
<------>dealloc_work_entries(cm_id_priv);
<------>kfree(cm_id_priv);
}
 
/*
 * Release a reference on cm_id. If the last reference is being
 * released, free the cm_id and return 1.
 */
static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
{
<------>BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
<------>if (atomic_dec_and_test(&cm_id_priv->refcount)) {
<------><------>BUG_ON(!list_empty(&cm_id_priv->work_list));
<------><------>free_cm_id(cm_id_priv);
<------><------>return 1;
<------>}
 
<------>return 0;
}
 
static void add_ref(struct iw_cm_id *cm_id)
{
<------>struct iwcm_id_private *cm_id_priv;
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
<------>atomic_inc(&cm_id_priv->refcount);
}
 
static void rem_ref(struct iw_cm_id *cm_id)
{
<------>struct iwcm_id_private *cm_id_priv;
 
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 
<------>(void)iwcm_deref_id(cm_id_priv);
}
 
static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
 
struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
<------><------><------><------> iw_cm_handler cm_handler,
<------><------><------><------> void *context)
{
<------>struct iwcm_id_private *cm_id_priv;
 
<------>cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
<------>if (!cm_id_priv)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>cm_id_priv->state = IW_CM_STATE_IDLE;
<------>cm_id_priv->id.device = device;
<------>cm_id_priv->id.cm_handler = cm_handler;
<------>cm_id_priv->id.context = context;
<------>cm_id_priv->id.event_handler = cm_event_handler;
<------>cm_id_priv->id.add_ref = add_ref;
<------>cm_id_priv->id.rem_ref = rem_ref;
<------>spin_lock_init(&cm_id_priv->lock);
<------>atomic_set(&cm_id_priv->refcount, 1);
<------>init_waitqueue_head(&cm_id_priv->connect_wait);
<------>init_completion(&cm_id_priv->destroy_comp);
<------>INIT_LIST_HEAD(&cm_id_priv->work_list);
<------>INIT_LIST_HEAD(&cm_id_priv->work_free_list);
 
<------>return &cm_id_priv->id;
}
EXPORT_SYMBOL(iw_create_cm_id);
 
 
static int iwcm_modify_qp_err(struct ib_qp *qp)
{
<------>struct ib_qp_attr qp_attr;
 
<------>if (!qp)
<------><------>return -EINVAL;
 
<------>qp_attr.qp_state = IB_QPS_ERR;
<------>return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
}
 
/*
 * This is really the RDMAC CLOSING state. It is most similar to the
 * IB SQD QP state.
 */
static int iwcm_modify_qp_sqd(struct ib_qp *qp)
{
<------>struct ib_qp_attr qp_attr;
 
<------>BUG_ON(qp == NULL);
<------>qp_attr.qp_state = IB_QPS_SQD;
<------>return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
}
 
/*
 * CM_ID <-- CLOSING
 *
 * Block if a passive or active connection is currently being processed. Then
 * process the event as follows:
 * - If we are ESTABLISHED, move to CLOSING and modify the QP state
 *   based on the abrupt flag
 * - If the connection is already in the CLOSING or IDLE state, the peer is
 *   disconnecting concurrently with us and we've already seen the
 *   DISCONNECT event -- ignore the request and return 0
 * - Disconnect on a listening endpoint returns -EINVAL
 */
int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
{
<------>struct iwcm_id_private *cm_id_priv;
<------>unsigned long flags;
<------>int ret = 0;
<------>struct ib_qp *qp = NULL;
 
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
<------>/* Wait if we're currently in a connect or accept downcall */
<------>wait_event(cm_id_priv->connect_wait,
<------><------>   !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>switch (cm_id_priv->state) {
<------>case IW_CM_STATE_ESTABLISHED:
<------><------>cm_id_priv->state = IW_CM_STATE_CLOSING;
 
<------><------>/* QP could be <nul> for user-mode client */
<------><------>if (cm_id_priv->qp)
<------><------><------>qp = cm_id_priv->qp;
<------><------>else
<------><------><------>ret = -EINVAL;
<------><------>break;
<------>case IW_CM_STATE_LISTEN:
<------><------>ret = -EINVAL;
<------><------>break;
<------>case IW_CM_STATE_CLOSING:
<------><------>/* remote peer closed first */
<------>case IW_CM_STATE_IDLE:
<------><------>/* accept or connect returned !0 */
<------><------>break;
<------>case IW_CM_STATE_CONN_RECV:
<------><------>/*
<------><------> * App called disconnect before/without calling accept after
<------><------> * connect_request event delivered.
<------><------> */
<------><------>break;
<------>case IW_CM_STATE_CONN_SENT:
<------><------>/* Can only get here if wait above fails */
<------>default:
<------><------>BUG();
<------>}
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 
<------>if (qp) {
<------><------>if (abrupt)
<------><------><------>ret = iwcm_modify_qp_err(qp);
<------><------>else
<------><------><------>ret = iwcm_modify_qp_sqd(qp);
 
<------><------>/*
<------><------> * If both sides are disconnecting the QP could
<------><------> * already be in ERR or SQD states
<------><------> */
<------><------>ret = 0;
<------>}
 
<------>return ret;
}
EXPORT_SYMBOL(iw_cm_disconnect);
 
/*
 * CM_ID <-- DESTROYING
 *
 * Clean up all resources associated with the connection and release
 * the initial reference taken by iw_create_cm_id.
 */
static void destroy_cm_id(struct iw_cm_id *cm_id)
{
<------>struct iwcm_id_private *cm_id_priv;
<------>struct ib_qp *qp;
<------>unsigned long flags;
 
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
<------>/*
<------> * Wait if we're currently in a connect or accept downcall. A
<------> * listening endpoint should never block here.
<------> */
<------>wait_event(cm_id_priv->connect_wait,
<------><------>   !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
 
<------>/*
<------> * Since we're deleting the cm_id, drop any events that
<------> * might arrive before the last dereference.
<------> */
<------>set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
 
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>qp = cm_id_priv->qp;
<------>cm_id_priv->qp = NULL;
 
<------>switch (cm_id_priv->state) {
<------>case IW_CM_STATE_LISTEN:
<------><------>cm_id_priv->state = IW_CM_STATE_DESTROYING;
<------><------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------><------>/* destroy the listening endpoint */
<------><------>cm_id->device->ops.iw_destroy_listen(cm_id);
<------><------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------><------>break;
<------>case IW_CM_STATE_ESTABLISHED:
<------><------>cm_id_priv->state = IW_CM_STATE_DESTROYING;
<------><------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------><------>/* Abrupt close of the connection */
<------><------>(void)iwcm_modify_qp_err(qp);
<------><------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------><------>break;
<------>case IW_CM_STATE_IDLE:
<------>case IW_CM_STATE_CLOSING:
<------><------>cm_id_priv->state = IW_CM_STATE_DESTROYING;
<------><------>break;
<------>case IW_CM_STATE_CONN_RECV:
<------><------>/*
<------><------> * App called destroy before/without calling accept after
<------><------> * receiving connection request event notification or
<------><------> * returned non zero from the event callback function.
<------><------> * In either case, must tell the provider to reject.
<------><------> */
<------><------>cm_id_priv->state = IW_CM_STATE_DESTROYING;
<------><------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------><------>cm_id->device->ops.iw_reject(cm_id, NULL, 0);
<------><------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------><------>break;
<------>case IW_CM_STATE_CONN_SENT:
<------>case IW_CM_STATE_DESTROYING:
<------>default:
<------><------>BUG();
<------><------>break;
<------>}
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------>if (qp)
<------><------>cm_id_priv->id.device->ops.iw_rem_ref(qp);
 
<------>if (cm_id->mapped) {
<------><------>iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
<------><------>iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
<------>}
 
<------>(void)iwcm_deref_id(cm_id_priv);
}
 
/*
 * This function is only called by the application thread and cannot
 * be called by the event thread. The function will wait for all
 * references to be released on the cm_id and then kfree the cm_id
 * object.
 */
void iw_destroy_cm_id(struct iw_cm_id *cm_id)
{
<------>destroy_cm_id(cm_id);
}
EXPORT_SYMBOL(iw_destroy_cm_id);
 
/**
 * iw_cm_check_wildcard - If IP address is 0 then use original
 * @pm_addr: sockaddr containing the ip to check for wildcard
 * @cm_addr: sockaddr containing the actual IP address
 * @cm_outaddr: sockaddr to set IP addr which leaving port
 *
 *  Checks the pm_addr for wildcard and then sets cm_outaddr's
 *  IP to the actual (cm_addr).
 */
static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
<------><------><------><------> struct sockaddr_storage *cm_addr,
<------><------><------><------> struct sockaddr_storage *cm_outaddr)
{
<------>if (pm_addr->ss_family == AF_INET) {
<------><------>struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
 
<------><------>if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
<------><------><------>struct sockaddr_in *cm4_addr =
<------><------><------><------>(struct sockaddr_in *)cm_addr;
<------><------><------>struct sockaddr_in *cm4_outaddr =
<------><------><------><------>(struct sockaddr_in *)cm_outaddr;
 
<------><------><------>cm4_outaddr->sin_addr = cm4_addr->sin_addr;
<------><------>}
<------>} else {
<------><------>struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
 
<------><------>if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
<------><------><------>struct sockaddr_in6 *cm6_addr =
<------><------><------><------>(struct sockaddr_in6 *)cm_addr;
<------><------><------>struct sockaddr_in6 *cm6_outaddr =
<------><------><------><------>(struct sockaddr_in6 *)cm_outaddr;
 
<------><------><------>cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
<------><------>}
<------>}
}
 
/**
 * iw_cm_map - Use portmapper to map the ports
 * @cm_id: connection manager pointer
 * @active: Indicates the active side when true
 * returns nonzero for error only if iwpm_create_mapinfo() fails
 *
 * Tries to add a mapping for a port using the Portmapper. If
 * successful in mapping the IP/Port it will check the remote
 * mapped IP address for a wildcard IP address and replace the
 * zero IP address with the remote_addr.
 */
static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
{
<------>const char *devname = dev_name(&cm_id->device->dev);
<------>const char *ifname = cm_id->device->iw_ifname;
<------>struct iwpm_dev_data pm_reg_msg = {};
<------>struct iwpm_sa_data pm_msg;
<------>int status;
 
<------>if (strlen(devname) >= sizeof(pm_reg_msg.dev_name) ||
<------>    strlen(ifname) >= sizeof(pm_reg_msg.if_name))
<------><------>return -EINVAL;
 
<------>cm_id->m_local_addr = cm_id->local_addr;
<------>cm_id->m_remote_addr = cm_id->remote_addr;
 
<------>strcpy(pm_reg_msg.dev_name, devname);
<------>strcpy(pm_reg_msg.if_name, ifname);
 
<------>if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
<------>    !iwpm_valid_pid())
<------><------>return 0;
 
<------>cm_id->mapped = true;
<------>pm_msg.loc_addr = cm_id->local_addr;
<------>pm_msg.rem_addr = cm_id->remote_addr;
<------>pm_msg.flags = (cm_id->device->iw_driver_flags & IW_F_NO_PORT_MAP) ?
<------><------>       IWPM_FLAGS_NO_PORT_MAP : 0;
<------>if (active)
<------><------>status = iwpm_add_and_query_mapping(&pm_msg,
<------><------><------><------><------><------>    RDMA_NL_IWCM);
<------>else
<------><------>status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
 
<------>if (!status) {
<------><------>cm_id->m_local_addr = pm_msg.mapped_loc_addr;
<------><------>if (active) {
<------><------><------>cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
<------><------><------>iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
<------><------><------><------><------>     &cm_id->remote_addr,
<------><------><------><------><------>     &cm_id->m_remote_addr);
<------><------>}
<------>}
 
<------>return iwpm_create_mapinfo(&cm_id->local_addr,
<------><------><------><------>   &cm_id->m_local_addr,
<------><------><------><------>   RDMA_NL_IWCM, pm_msg.flags);
}
 
/*
 * CM_ID <-- LISTEN
 *
 * Start listening for connect requests. Generates one CONNECT_REQUEST
 * event for each inbound connect request.
 */
int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
{
<------>struct iwcm_id_private *cm_id_priv;
<------>unsigned long flags;
<------>int ret;
 
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
 
<------>if (!backlog)
<------><------>backlog = default_backlog;
 
<------>ret = alloc_work_entries(cm_id_priv, backlog);
<------>if (ret)
<------><------>return ret;
 
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>switch (cm_id_priv->state) {
<------>case IW_CM_STATE_IDLE:
<------><------>cm_id_priv->state = IW_CM_STATE_LISTEN;
<------><------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------><------>ret = iw_cm_map(cm_id, false);
<------><------>if (!ret)
<------><------><------>ret = cm_id->device->ops.iw_create_listen(cm_id,
<------><------><------><------><------><------><------><------>  backlog);
<------><------>if (ret)
<------><------><------>cm_id_priv->state = IW_CM_STATE_IDLE;
<------><------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------>}
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 
<------>return ret;
}
EXPORT_SYMBOL(iw_cm_listen);
 
/*
 * CM_ID <-- IDLE
 *
 * Rejects an inbound connection request. No events are generated.
 */
int iw_cm_reject(struct iw_cm_id *cm_id,
<------><------> const void *private_data,
<------><------> u8 private_data_len)
{
<------>struct iwcm_id_private *cm_id_priv;
<------>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;
<------>}
<------>cm_id_priv->state = IW_CM_STATE_IDLE;
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 
<------>ret = cm_id->device->ops.iw_reject(cm_id, private_data,
<------><------><------><------><------>  private_data_len);
 
<------>clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
<------>wake_up_all(&cm_id_priv->connect_wait);
 
<------>return ret;
}
EXPORT_SYMBOL(iw_cm_reject);
 
/*
 * 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->ops.iw_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->ops.iw_add_ref(qp);
<------>cm_id_priv->qp = qp;
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 
<------>ret = cm_id->device->ops.iw_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);
<------><------>qp = cm_id_priv->qp;
<------><------>cm_id_priv->qp = NULL;
<------><------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------><------>if (qp)
<------><------><------>cm_id->device->ops.iw_rem_ref(qp);
<------><------>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 = NULL;
 
<------>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) {
<------><------>ret = -EINVAL;
<------><------>goto err;
<------>}
 
<------>/* Get the ib_qp given the QPN */
<------>qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
<------>if (!qp) {
<------><------>ret = -EINVAL;
<------><------>goto err;
<------>}
<------>cm_id->device->ops.iw_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 = iw_cm_map(cm_id, true);
<------>if (!ret)
<------><------>ret = cm_id->device->ops.iw_connect(cm_id, iw_param);
<------>if (!ret)
<------><------>return 0;	/* success */
 
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>qp = cm_id_priv->qp;
<------>cm_id_priv->qp = NULL;
<------>cm_id_priv->state = IW_CM_STATE_IDLE;
err:
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------>if (qp)
<------><------>cm_id->device->ops.iw_rem_ref(qp);
<------>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);
 
<------>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->m_local_addr = iw_event->local_addr;
<------>cm_id->m_remote_addr = iw_event->remote_addr;
<------>cm_id->local_addr = listen_id_priv->id.local_addr;
 
<------>ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
<------><------><------><------>   &iw_event->remote_addr,
<------><------><------><------>   &cm_id->remote_addr,
<------><------><------><------>   RDMA_NL_IWCM);
<------>if (ret) {
<------><------>cm_id->remote_addr = iw_event->remote_addr;
<------>} else {
<------><------>iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
<------><------><------><------>     &iw_event->local_addr,
<------><------><------><------>     &cm_id->local_addr);
<------><------>iw_event->local_addr = cm_id->local_addr;
<------><------>iw_event->remote_addr = cm_id->remote_addr;
<------>}
 
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
<------>cm_id_priv->state = IW_CM_STATE_CONN_RECV;
 
<------>/*
<------> * 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);
<------><------>iw_cm_reject(cm_id, NULL, 0);
<------><------>iw_destroy_cm_id(cm_id);
<------><------>goto out;
<------>}
<------>spin_unlock_irqrestore(&listen_id_priv->lock, flags);
 
<------>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);
<------><------>iw_destroy_cm_id(cm_id);
<------>}
 
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)
{
<------>struct ib_qp *qp = NULL;
<------>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.m_local_addr = iw_event->local_addr;
<------><------>cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
<------><------>iw_event->local_addr = cm_id_priv->id.local_addr;
<------><------>iw_event->remote_addr = cm_id_priv->id.remote_addr;
<------><------>cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
<------>} else {
<------><------>/* REJECTED or RESET */
<------><------>qp = 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);
<------>if (qp)
<------><------>cm_id_priv->id.device->ops.iw_rem_ref(qp);
<------>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)
{
<------>struct ib_qp *qp;
<------>unsigned long flags;
<------>int ret = 0, notify_event = 0;
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>qp = 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;
<------><------>notify_event = 1;
<------><------>break;
<------>case IW_CM_STATE_DESTROYING:
<------><------>break;
<------>default:
<------><------>BUG();
<------>}
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
 
<------>if (qp)
<------><------>cm_id_priv->id.device->ops.iw_rem_ref(qp);
<------>if (notify_event)
<------><------>ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
<------>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;
 
<------>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);
 
<------><------>if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
<------><------><------>ret = process_event(cm_id_priv, &levent);
<------><------><------>if (ret)
<------><------><------><------>destroy_cm_id(&cm_id_priv->id);
<------><------>} else
<------><------><------>pr_debug("dropping event %d\n", levent.event);
<------><------>if (iwcm_deref_id(cm_id_priv))
<------><------><------>return;
<------><------>if (empty)
<------><------><------>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,
<------><------><------><------>  struct ib_qp_attr *qp_attr,
<------><------><------><------>  int *qp_attr_mask)
{
<------>unsigned long flags;
<------>int ret;
 
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>switch (cm_id_priv->state) {
<------>case IW_CM_STATE_IDLE:
<------>case IW_CM_STATE_CONN_SENT:
<------>case IW_CM_STATE_CONN_RECV:
<------>case IW_CM_STATE_ESTABLISHED:
<------><------>*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
<------><------>qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
<------><------><------><------><------>   IB_ACCESS_REMOTE_READ;
<------><------>ret = 0;
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------><------>break;
<------>}
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------>return ret;
}
 
static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
<------><------><------><------>  struct ib_qp_attr *qp_attr,
<------><------><------><------>  int *qp_attr_mask)
{
<------>unsigned long flags;
<------>int ret;
 
<------>spin_lock_irqsave(&cm_id_priv->lock, flags);
<------>switch (cm_id_priv->state) {
<------>case IW_CM_STATE_IDLE:
<------>case IW_CM_STATE_CONN_SENT:
<------>case IW_CM_STATE_CONN_RECV:
<------>case IW_CM_STATE_ESTABLISHED:
<------><------>*qp_attr_mask = 0;
<------><------>ret = 0;
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------><------>break;
<------>}
<------>spin_unlock_irqrestore(&cm_id_priv->lock, flags);
<------>return ret;
}
 
int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
<------><------>       struct ib_qp_attr *qp_attr,
<------><------>       int *qp_attr_mask)
{
<------>struct iwcm_id_private *cm_id_priv;
<------>int ret;
 
<------>cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
<------>switch (qp_attr->qp_state) {
<------>case IB_QPS_INIT:
<------>case IB_QPS_RTR:
<------><------>ret = iwcm_init_qp_init_attr(cm_id_priv,
<------><------><------><------><------>     qp_attr, qp_attr_mask);
<------><------>break;
<------>case IB_QPS_RTS:
<------><------>ret = iwcm_init_qp_rts_attr(cm_id_priv,
<------><------><------><------><------>    qp_attr, qp_attr_mask);
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------><------>break;
<------>}
<------>return ret;
}
EXPORT_SYMBOL(iw_cm_init_qp_attr);
 
static int __init iw_cm_init(void)
{
<------>int ret;
 
<------>ret = iwpm_init(RDMA_NL_IWCM);
<------>if (ret)
<------><------>return ret;
 
<------>iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0);
<------>if (!iwcm_wq)
<------><------>goto err_alloc;
 
<------>iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
<------><------><------><------><------><------> iwcm_ctl_table);
<------>if (!iwcm_ctl_table_hdr) {
<------><------>pr_err("iw_cm: couldn't register sysctl paths\n");
<------><------>goto err_sysctl;
<------>}
 
<------>rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
<------>return 0;
 
err_sysctl:
<------>destroy_workqueue(iwcm_wq);
err_alloc:
<------>iwpm_exit(RDMA_NL_IWCM);
<------>return -ENOMEM;
}
 
static void __exit iw_cm_cleanup(void)
{
<------>rdma_nl_unregister(RDMA_NL_IWCM);
<------>unregister_net_sysctl_table(iwcm_ctl_table_hdr);
<------>destroy_workqueue(iwcm_wq);
<------>iwpm_exit(RDMA_NL_IWCM);
}
 
MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
 
module_init(iw_cm_init);
module_exit(iw_cm_cleanup);