diff options
Diffstat (limited to 'sys/contrib/rdma/rdma_iwcm.c')
| -rw-r--r-- | sys/contrib/rdma/rdma_iwcm.c | 1086 |
1 files changed, 0 insertions, 1086 deletions
diff --git a/sys/contrib/rdma/rdma_iwcm.c b/sys/contrib/rdma/rdma_iwcm.c deleted file mode 100644 index 916abcd..0000000 --- a/sys/contrib/rdma/rdma_iwcm.c +++ /dev/null @@ -1,1086 +0,0 @@ -/* - * 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("$FreeBSD$"); - -#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); |
