/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2002-2003, Network Appliance, Inc. All rights reserved.
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 *
 * MODULE: dapl_evd_modify_cno.c
 *
 * PURPOSE: Event Management
 *
 * Description: Interfaces in this file are completely described in
 *              the DAPL 1.1 API, Chapter 6, section 3
 *
 * $Id: dapl_evd_modify_cno.c,v 1.10 2003/07/14 17:50:32 sjs2 Exp $
 */

#include "dapl.h"
#include "dapl_adapter_util.h"

/*
 * dapl_evd_modify_cno
 *
 * DAPL Requirements Version xxx, 6.3.2.4
 *
 * Modify the CNO associated with the EVD
 *
 * Input:
 *      evd_handle
 *      cno_handle
 *
 * Output:
 *      none
 *
 * Returns:
 *      DAT_SUCCSSS
 *      DAT_INVALID_HANDLE
 */

DAT_RETURN
dapl_evd_modify_cno(
        IN      DAT_EVD_HANDLE          evd_handle,
        IN      DAT_CNO_HANDLE          cno_handle)
{
        DAPL_EVD        *evd_ptr;
        DAPL_CNO        *cno_ptr;
        DAPL_CNO        *old_cno_ptr;
        DAT_RETURN      dat_status;

        evd_ptr = (DAPL_EVD *)evd_handle;
        cno_ptr = (DAPL_CNO *)cno_handle;
        dat_status = DAT_SUCCESS;

        if (DAPL_BAD_HANDLE(evd_handle, DAPL_MAGIC_EVD)) {
                dat_status = DAT_ERROR(DAT_INVALID_HANDLE, 0);
                goto bail;
        }

        /* cno_handle of DAT_HANDLE_NULL disassociated the EVD with any CNO */
        if ((cno_handle != DAT_HANDLE_NULL) &&
            DAPL_BAD_HANDLE(cno_handle, DAPL_MAGIC_CNO)) {
                dat_status = DAT_ERROR(DAT_INVALID_HANDLE,
                    DAT_INVALID_HANDLE_CNO);
                goto bail;
        }

        /* nothing to change */
        if (cno_ptr == evd_ptr->cno_ptr) {
                dat_status = DAT_SUCCESS;
                goto bail;
        }

        if (dapls_ib_modify_cno(evd_ptr, cno_ptr) != DAT_SUCCESS) {
                dat_status = DAT_ERROR(DAT_INVALID_HANDLE, 0);
                goto bail;
        }

        dapl_os_lock(&evd_ptr->header.lock);
        old_cno_ptr = evd_ptr->cno_ptr;
        evd_ptr->cno_ptr = cno_ptr;
        dapl_os_unlock(&evd_ptr->header.lock);

        /*
         * We need to first remove the evd from the old CNO's list before
         * adding it to the new CNO's list
         */
        if (old_cno_ptr) {
                dapl_os_lock(&(old_cno_ptr->header.lock));
                (void) dapl_llist_remove_entry(&old_cno_ptr->evd_list_head,
                    &evd_ptr->cno_list_entry);
                dapl_os_atomic_dec(&(old_cno_ptr->cno_ref_count));
                dapl_os_unlock(&(old_cno_ptr->header.lock));

        }

        if (cno_ptr) {
                dapl_os_lock(&(cno_ptr->header.lock));
                dapl_llist_add_head(&cno_ptr->evd_list_head,
                    &evd_ptr->cno_list_entry, evd_ptr);
                /* Take a reference count on the CNO */
                dapl_os_atomic_inc(&(cno_ptr->cno_ref_count));
                dapl_os_unlock(&cno_ptr->header.lock);
        }

        /*
         * We need to enable the callback handler if the EVD has a CQ associated
         * to it and is enabled.
         */
        if ((evd_ptr->evd_flags & (DAT_EVD_DTO_FLAG | DAT_EVD_RMR_BIND_FLAG)) &&
            evd_ptr->evd_enabled && cno_handle != DAT_HANDLE_NULL) {
                dat_status = DAPL_NOTIFY(evd_ptr)(
                    evd_ptr->ib_cq_handle, IB_NOTIFY_ON_NEXT_COMP, 0);

                /* FIXME report error */
                dapl_os_assert(dat_status == DAT_SUCCESS);
        }

bail:
        return (dat_status);
}