dapl_evd_resize.c revision 9517:b4839b0aa7a4 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2002-2003, Network Appliance, Inc. All rights reserved.
24 */
25
26/*
27 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
28 * Use is subject to license terms.
29 */
30
31/*
32 *
33 * MODULE: dapl_evd_resize.c
34 *
35 * PURPOSE: EVENT management
36 *
37 * Description: Interfaces in this file are completely defined in
38 *              the uDAPL 1.1 API, Chapter 6, section 3
39 *
40 * $Id: dapl_evd_resize.c,v 1.4 2003/06/16 17:53:32 sjs2 Exp $
41 */
42
43#include "dapl_evd_util.h"
44#include "dapl_ring_buffer_util.h"
45#include "dapl_adapter_util.h"
46#include "dapl.h"
47
48#define	DAPL_MIN_RESZ_QLEN	4096
49
50/*
51 * dapl_evd_resize
52 *
53 * DAPL Requirements Version xxx, 6.3.2.5
54 *
55 * Modify the size fo the event queue of an Event Dispatcher
56 *
57 * Input:
58 * 	evd_handle
59 * 	evd_qlen
60 *
61 * Output:
62 * 	none
63 *
64 * Returns:
65 * 	DAT_SUCCESS
66 * 	DAT_INVALID_PARAMETER
67 * 	DAT_INSUFFICIENT_RESOURCES
68 * 	DAT_INVALID_STATE
69 */
70
71DAT_RETURN dapl_evd_resize(
72	IN	DAT_EVD_HANDLE	   evd_handle,
73	IN	DAT_COUNT	   req_evd_qlen)
74{
75	int			i;
76	DAPL_EVD		*evd_ptr;
77	DAT_EVENT		*event_ptr;
78	DAT_EVENT		*eventp;
79	DAT_EVENT		*event;
80	DAT_EVENT		*new_event;
81	DAPL_RING_BUFFER	free_event_queue;
82	DAPL_RING_BUFFER	pending_event_queue;
83	DAT_RETURN		dat_status;
84	DAT_COUNT		max_evd_qlen;
85	DAT_COUNT		evd_qlen;
86
87	evd_ptr = (DAPL_EVD *)evd_handle;
88	dat_status = DAT_SUCCESS;
89
90	if (DAPL_BAD_HANDLE(evd_handle, DAPL_MAGIC_EVD)) {
91		return (DAT_ERROR(DAT_INVALID_HANDLE, 0));
92	}
93
94	if (req_evd_qlen < evd_ptr->qlen) {
95		return (DAT_ERROR(DAT_INVALID_STATE, 0));
96	}
97
98	if (req_evd_qlen == evd_ptr->qlen) {
99		return (DAT_SUCCESS);
100	}
101
102	max_evd_qlen = evd_ptr->header.owner_ia->hca_ptr->ia_attr.max_evd_qlen;
103	if (req_evd_qlen > max_evd_qlen) {
104		return (DAT_ERROR(DAT_INVALID_STATE, 0));
105	}
106
107	evd_qlen = DAPL_MIN_RESZ_QLEN;
108	while (req_evd_qlen > evd_qlen) {
109		evd_qlen <<= 1;
110		if (evd_qlen > max_evd_qlen)
111			evd_qlen = max_evd_qlen;
112	}
113
114	/* Allocate EVENTs */
115	event_ptr = (DAT_EVENT *) dapl_os_alloc(evd_qlen * sizeof (DAT_EVENT));
116	if (!event_ptr) {
117		return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES,
118		    DAT_RESOURCE_MEMORY));
119	}
120
121	/* allocate free event queue */
122	dat_status = dapls_rbuf_alloc(&free_event_queue, evd_qlen);
123	if (dat_status != DAT_SUCCESS) {
124		goto bail;
125	}
126
127	/* allocate pending event queue */
128	dat_status = dapls_rbuf_alloc(&pending_event_queue, evd_qlen);
129	if (dat_status != DAT_SUCCESS) {
130		goto bail;
131	}
132
133	/* need to resize the cq only for DTO/BIND evds */
134	if (0 != (evd_ptr->evd_flags & ~ (DAT_EVD_SOFTWARE_FLAG |
135	    DAT_EVD_CONNECTION_FLAG | DAT_EVD_CR_FLAG))) {
136		dat_status = dapls_ib_cq_resize(evd_ptr, evd_qlen);
137		if (dat_status != DAT_SUCCESS)
138			goto bail;
139	}
140
141	/* add events to free event queue */
142	for (i = 0, eventp = event_ptr; i < evd_qlen; i++) {
143		(void) dapls_rbuf_add(&free_event_queue, (void *)eventp);
144		eventp++;
145	}
146	/*
147	 * copy pending events from evd to the new pending event queue
148	 */
149	while (event = (DAT_EVENT *)
150	    dapls_rbuf_remove(&evd_ptr->pending_event_queue)) {
151		new_event = (DAT_EVENT *) dapls_rbuf_remove(&free_event_queue);
152		dapl_os_assert(new_event);
153		(void) dapl_os_memcpy(new_event, event, sizeof (DAT_EVENT));
154		dat_status = dapls_rbuf_add(&pending_event_queue, new_event);
155		dapl_os_assert(dat_status == DAT_SUCCESS);
156		dat_status = dapls_rbuf_add(&evd_ptr->free_event_queue, event);
157		dapl_os_assert(dat_status == DAT_SUCCESS);
158	}
159
160	dapls_rbuf_destroy(&evd_ptr->free_event_queue);
161	dapls_rbuf_destroy(&evd_ptr->pending_event_queue);
162	if (evd_ptr->events) {
163		dapl_os_free(evd_ptr->events,
164		    evd_ptr->qlen * sizeof (DAT_EVENT));
165	}
166	evd_ptr->events = event_ptr;
167	evd_ptr->free_event_queue = free_event_queue;
168	evd_ptr->pending_event_queue = pending_event_queue;
169	evd_ptr->qlen = evd_qlen;
170
171	return (DAT_SUCCESS);
172bail:
173	/*
174	 * If we are here means event_ptr was allocd but something else
175	 * failed
176	 */
177	dapl_os_free(event_ptr, evd_qlen * sizeof (DAT_EVENT));
178	dapls_rbuf_destroy(&free_event_queue);
179	dapls_rbuf_destroy(&pending_event_queue);
180
181	return (dat_status);
182}
183