| Current Path : /compat/linux/proc/68247/root/sys/contrib/rdma/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //compat/linux/proc/68247/root/sys/contrib/rdma/rdma_iwcm.c |
/*
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/contrib/rdma/rdma_iwcm.c 178784 2008-05-05 18:35:55Z kmacy $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/libkern.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
#include <sys/priv.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <contrib/rdma/iw_cm.h>
enum iw_cm_state {
IW_CM_STATE_IDLE, /* unbound, inactive */
IW_CM_STATE_LISTEN, /* listen waiting for connect */
IW_CM_STATE_CONN_RECV, /* inbound waiting for user accept */
IW_CM_STATE_CONN_SENT, /* outbound waiting for peer accept */
IW_CM_STATE_ESTABLISHED, /* established */
IW_CM_STATE_CLOSING, /* disconnect */
IW_CM_STATE_DESTROYING /* object being deleted */
};
struct iwcm_id_private {
struct iw_cm_id id;
enum iw_cm_state state;
unsigned long flags;
struct ib_qp *qp;
void * destroy_comp;
void * connect_wait;
TAILQ_HEAD(, iwcm_work) work_list;
struct mtx lock;
volatile int refcount;
TAILQ_HEAD(, iwcm_work) work_free_list;
};
#define IWCM_F_CALLBACK_DESTROY 1
#define IWCM_F_CONNECT_WAIT 2
static struct taskqueue *iwcm_wq;
struct iwcm_work {
struct task task;
struct iwcm_id_private *cm_id;
TAILQ_ENTRY(iwcm_work) list;
struct iw_cm_event event;
TAILQ_ENTRY(iwcm_work) free_list;
};
/*
* 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 (TAILQ_EMPTY(&cm_id_priv->work_free_list))
return NULL;
work = TAILQ_FIRST(&cm_id_priv->work_free_list);
TAILQ_REMOVE(&cm_id_priv->work_free_list, work, free_list);
return work;
}
static void put_work(struct iwcm_work *work)
{
TAILQ_INSERT_HEAD(&work->cm_id->work_free_list, work, free_list);
}
static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
{
struct iwcm_work *e, *tmp;
TAILQ_FOREACH_SAFE(e, &cm_id_priv->work_free_list, free_list, tmp)
free(e, M_DEVBUF);
}
static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
{
struct iwcm_work *work;
PANIC_IF(!TAILQ_EMPTY(&cm_id_priv->work_free_list));
while (count--) {
work = malloc(sizeof(struct iwcm_work), M_DEVBUF, M_NOWAIT);
if (!work) {
dealloc_work_entries(cm_id_priv);
return (ENOMEM);
}
work->cm_id = cm_id_priv;
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 = malloc(event->private_data_len, M_DEVBUF, M_NOWAIT);
if (!p)
return (ENOMEM);
bcopy(event->private_data, p, event->private_data_len);
event->private_data = p;
return 0;
}
static void free_cm_id(struct iwcm_id_private *cm_id_priv)
{
dealloc_work_entries(cm_id_priv);
free(cm_id_priv, M_DEVBUF);
}
/*
* Release a reference on cm_id. If the last reference is being
* released, enable the waiting thread (in iw_destroy_cm_id) to
* get woken up, and return 1 if a thread is already waiting.
*/
static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
{
mtx_lock(&cm_id_priv->lock);
PANIC_IF(atomic_load_acq_int(&cm_id_priv->refcount)==0);
if (atomic_fetchadd_int(&cm_id_priv->refcount, -1) == 1) {
PANIC_IF(!TAILQ_EMPTY(&cm_id_priv->work_list));
wakeup(&cm_id_priv->destroy_comp);
mtx_unlock(&cm_id_priv->lock);
return 1;
}
mtx_unlock(&cm_id_priv->lock);
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);
mtx_lock(&cm_id_priv->lock);
atomic_add_int(&cm_id_priv->refcount, 1);
mtx_unlock(&cm_id_priv->lock);
}
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);
if (iwcm_deref_id(cm_id_priv) &&
isset(&cm_id_priv->flags, IWCM_F_CALLBACK_DESTROY)) {
PANIC_IF(!TAILQ_EMPTY(&cm_id_priv->work_list));
free_cm_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,
struct socket *so,
iw_cm_handler cm_handler,
void *context)
{
struct iwcm_id_private *cm_id_priv;
KASSERT(so, ("iw_create_cm_id called with NULL socket!"));
cm_id_priv = malloc(sizeof(*cm_id_priv), M_DEVBUF, M_NOWAIT);
if (!cm_id_priv)
return ERR_PTR(ENOMEM);
bzero(cm_id_priv, sizeof *cm_id_priv);
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;
cm_id_priv->id.so = so;
mtx_init(&cm_id_priv->lock, "cm_id_priv", NULL, MTX_DUPOK|MTX_DEF);
atomic_store_rel_int(&cm_id_priv->refcount, 1);
TAILQ_INIT(&cm_id_priv->work_list);
TAILQ_INIT(&cm_id_priv->work_free_list);
return &cm_id_priv->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;
PANIC_IF(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;
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 */
mtx_lock(&cm_id_priv->lock);
if (isset(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT))
msleep(&cm_id_priv->connect_wait, &cm_id_priv->lock, 0, "iwcm connect1", 0);
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:
panic("just cuz");
}
mtx_unlock(&cm_id_priv->lock);
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;
}
/*
* 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;
int ret;
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.
*/
mtx_lock(&cm_id_priv->lock);
if (isset(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT))
msleep(&cm_id_priv->connect_wait, &cm_id_priv->lock, 0, "iwcm connect2", 0);
switch (cm_id_priv->state) {
case IW_CM_STATE_LISTEN:
cm_id_priv->state = IW_CM_STATE_DESTROYING;
mtx_unlock(&cm_id_priv->lock);
/* destroy the listening endpoint */
ret = cm_id->device->iwcm->destroy_listen(cm_id);
mtx_lock(&cm_id_priv->lock);
break;
case IW_CM_STATE_ESTABLISHED:
cm_id_priv->state = IW_CM_STATE_DESTROYING;
mtx_unlock(&cm_id_priv->lock);
/* Abrupt close of the connection */
(void)iwcm_modify_qp_err(cm_id_priv->qp);
mtx_lock(&cm_id_priv->lock);
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;
break;
case IW_CM_STATE_CONN_SENT:
case IW_CM_STATE_DESTROYING:
default:
panic("just cuz");
break;
}
if (cm_id_priv->qp) {
cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp);
cm_id_priv->qp = NULL;
}
mtx_unlock(&cm_id_priv->lock);
(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 free the cm_id
* object.
*/
void iw_destroy_cm_id(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);
PANIC_IF(isset(&cm_id_priv->flags, IWCM_F_CALLBACK_DESTROY));
destroy_cm_id(cm_id);
mtx_lock(&cm_id_priv->lock);
if (atomic_load_acq_int(&cm_id_priv->refcount))
msleep(&cm_id_priv->destroy_comp, &cm_id_priv->lock, 0, "iwcm destroy", 0);
mtx_unlock(&cm_id_priv->lock);
free_cm_id(cm_id_priv);
}
/*
* 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;
int ret;
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
ret = alloc_work_entries(cm_id_priv, backlog);
if (ret)
return ret;
mtx_lock(&cm_id_priv->lock);
switch (cm_id_priv->state) {
case IW_CM_STATE_IDLE:
cm_id_priv->state = IW_CM_STATE_LISTEN;
mtx_unlock(&cm_id_priv->lock);
ret = cm_id->device->iwcm->create_listen(cm_id, backlog);
if (ret)
cm_id_priv->state = IW_CM_STATE_IDLE;
mtx_lock(&cm_id_priv->lock);
break;
default:
ret = EINVAL;
}
mtx_unlock(&cm_id_priv->lock);
return ret;
}
/*
* 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;
int ret;
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
setbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
mtx_lock(&cm_id_priv->lock);
if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
return (EINVAL);
}
cm_id_priv->state = IW_CM_STATE_IDLE;
mtx_unlock(&cm_id_priv->lock);
ret = cm_id->device->iwcm->reject(cm_id, private_data,
private_data_len);
mtx_lock(&cm_id_priv->lock);
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
return ret;
}
/*
* 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;
int ret;
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
setbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
mtx_lock(&cm_id_priv->lock);
if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
return (EINVAL);
}
/* Get the ib_qp given the QPN */
qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
if (!qp) {
mtx_unlock(&cm_id_priv->lock);
return (EINVAL);
}
cm_id->device->iwcm->add_ref(qp);
cm_id_priv->qp = qp;
mtx_unlock(&cm_id_priv->lock);
ret = cm_id->device->iwcm->accept(cm_id, iw_param);
if (ret) {
/* An error on accept precludes provider events */
PANIC_IF(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
cm_id_priv->state = IW_CM_STATE_IDLE;
mtx_lock(&cm_id_priv->lock);
if (cm_id_priv->qp) {
cm_id->device->iwcm->rem_ref(qp);
cm_id_priv->qp = NULL;
}
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
}
return ret;
}
/*
* 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;
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;
setbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
mtx_lock(&cm_id_priv->lock);
if (cm_id_priv->state != IW_CM_STATE_IDLE) {
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
return (EINVAL);
}
/* Get the ib_qp given the QPN */
qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn);
if (!qp) {
mtx_unlock(&cm_id_priv->lock);
return (EINVAL);
}
cm_id->device->iwcm->add_ref(qp);
cm_id_priv->qp = qp;
cm_id_priv->state = IW_CM_STATE_CONN_SENT;
mtx_unlock(&cm_id_priv->lock);
ret = cm_id->device->iwcm->connect(cm_id, iw_param);
if (ret) {
mtx_lock(&cm_id_priv->lock);
if (cm_id_priv->qp) {
cm_id->device->iwcm->rem_ref(qp);
cm_id_priv->qp = NULL;
}
PANIC_IF(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
cm_id_priv->state = IW_CM_STATE_IDLE;
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
}
return ret;
}
/*
* 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)
{
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.
*/
PANIC_IF(iw_event->status);
/*
* We could be destroying the listening id. If so, ignore this
* upcall.
*/
mtx_lock(&listen_id_priv->lock);
if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
mtx_unlock(&listen_id_priv->lock);
goto out;
}
mtx_unlock(&listen_id_priv->lock);
cm_id = iw_create_cm_id(listen_id_priv->id.device,
iw_event->so,
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);
setbit(&cm_id_priv->flags, IWCM_F_CALLBACK_DESTROY);
destroy_cm_id(cm_id);
if (atomic_load_acq_int(&cm_id_priv->refcount)==0)
free_cm_id(cm_id_priv);
}
out:
if (iw_event->private_data_len)
free(iw_event->private_data, M_DEVBUF);
}
/*
* 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)
{
int ret;
mtx_lock(&cm_id_priv->lock);
/*
* 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.
*/
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
PANIC_IF(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
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)
{
int ret;
mtx_lock(&cm_id_priv->lock);
/*
* Clear the connect wait bit so a callback function calling
* iw_cm_disconnect will not wait and deadlock this thread
*/
clrbit(&cm_id_priv->flags, IWCM_F_CONNECT_WAIT);
PANIC_IF(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
if (iw_event->status == IW_CM_EVENT_STATUS_ACCEPTED) {
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;
}
mtx_unlock(&cm_id_priv->lock);
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
mtx_lock(&cm_id_priv->lock);
if (iw_event->private_data_len)
free(iw_event->private_data, M_DEVBUF);
/* Wake up waiters on connect complete */
wakeup(&cm_id_priv->connect_wait);
mtx_unlock(&cm_id_priv->lock);
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)
{
mtx_lock(&cm_id_priv->lock);
if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
cm_id_priv->state = IW_CM_STATE_CLOSING;
mtx_unlock(&cm_id_priv->lock);
}
/*
* 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)
{
int ret = 0;
mtx_lock(&cm_id_priv->lock);
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;
mtx_unlock(&cm_id_priv->lock);
ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
mtx_lock(&cm_id_priv->lock);
break;
case IW_CM_STATE_DESTROYING:
break;
default:
panic("just cuz");
}
mtx_unlock(&cm_id_priv->lock);
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:
panic("just cuz");
}
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(void *context, int pending)
{
struct iwcm_work *work = context;
struct iw_cm_event levent;
struct iwcm_id_private *cm_id_priv = work->cm_id;
int empty;
int ret = 0;
mtx_lock(&cm_id_priv->lock);
empty = TAILQ_EMPTY(&cm_id_priv->work_list);
while (!empty) {
work = TAILQ_FIRST(&cm_id_priv->work_list);
TAILQ_REMOVE(&cm_id_priv->work_list, work, list);
empty = TAILQ_EMPTY(&cm_id_priv->work_list);
levent = work->event;
put_work(work);
mtx_unlock(&cm_id_priv->lock);
ret = process_event(cm_id_priv, &levent);
if (ret) {
setbit(&cm_id_priv->flags, IWCM_F_CALLBACK_DESTROY);
destroy_cm_id(&cm_id_priv->id);
}
PANIC_IF(atomic_load_acq_int(&cm_id_priv->refcount)==0);
if (iwcm_deref_id(cm_id_priv)) {
if (isset(&cm_id_priv->flags,
IWCM_F_CALLBACK_DESTROY)) {
PANIC_IF(!TAILQ_EMPTY(&cm_id_priv->work_list));
free_cm_id(cm_id_priv);
}
return;
}
mtx_lock(&cm_id_priv->lock);
}
mtx_unlock(&cm_id_priv->lock);
}
/*
* 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;
int ret = 0;
cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
mtx_lock(&cm_id_priv->lock);
work = get_work(cm_id_priv);
if (!work) {
ret = ENOMEM;
goto out;
}
TASK_INIT(&work->task, 0, cm_work_handler, work);
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_add_acq_int(&cm_id_priv->refcount, 1);
if (TAILQ_EMPTY(&cm_id_priv->work_list)) {
TAILQ_INSERT_TAIL(&cm_id_priv->work_list, work, list);
taskqueue_enqueue(iwcm_wq, &work->task);
} else
TAILQ_INSERT_TAIL(&cm_id_priv->work_list, work, list);
out:
mtx_unlock(&cm_id_priv->lock);
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)
{
int ret;
mtx_lock(&cm_id_priv->lock);
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_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE|
IB_ACCESS_REMOTE_READ;
ret = 0;
break;
default:
ret = EINVAL;
break;
}
mtx_unlock(&cm_id_priv->lock);
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)
{
int ret;
mtx_lock(&cm_id_priv->lock);
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;
}
mtx_unlock(&cm_id_priv->lock);
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;
}
static int iw_cm_init(void)
{
iwcm_wq = taskqueue_create("iw_cm_wq", M_NOWAIT, taskqueue_thread_enqueue, &iwcm_wq);
if (!iwcm_wq)
return (ENOMEM);
taskqueue_start_threads(&iwcm_wq, 1, PI_NET, "iw_cm_wq thread");
return 0;
}
static void iw_cm_cleanup(void)
{
taskqueue_free(iwcm_wq);
}
static int
iw_cm_load(module_t mod, int cmd, void *arg)
{
int err = 0;
switch (cmd) {
case MOD_LOAD:
printf("Loading rdma_iwcm.\n");
iw_cm_init();
break;
case MOD_QUIESCE:
break;
case MOD_UNLOAD:
printf("Unloading rdma_iwcm.\n");
iw_cm_cleanup();
break;
case MOD_SHUTDOWN:
break;
default:
err = EOPNOTSUPP;
break;
}
return (err);
}
static moduledata_t mod_data = {
"rdma_iwcm",
iw_cm_load,
0
};
MODULE_VERSION(rdma_iwcm, 1);
MODULE_DEPEND(rdma_iwcm, rdma_core, 1, 1, 1);
DECLARE_MODULE(rdma_iwcm, mod_data, SI_SUB_EXEC, SI_ORDER_ANY);