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 2008 Sun Microsystems, Inc. All rights reserved.
28 * Use is subject to license terms.
29 */
30
31 /*
32 *
33 * MODULE: dapl_evd_dto_callback.c
34 *
35 * PURPOSE: implements DTO callbacks from verbs
36 *
37 * $Id: dapl_evd_dto_callb.c,v 1.17 2003/07/30 18:13:38 hobie16 Exp $
38 */
39
40 #include "dapl.h"
41 #include "dapl_evd_util.h"
42 #include "dapl_cno_util.h"
43 #include "dapl_cookie.h"
44 #include "dapl_adapter_util.h"
45
46 /*
47 * dapl_evd_dto_callback
48 *
49 * Input:
50 * hca_handle_in,
51 * cq_handle_in,
52 * user_context_cq_p
53 *
54 * Output:
55 * none
56 *
57 * This is invoked for both DTO and MW bind completions. Strictly
58 * speaking it is an event callback rather than just a DTO callback.
59 *
60 */
61
62 void
dapl_evd_dto_callback(IN ib_hca_handle_t hca_handle,IN ib_cq_handle_t cq_handle,IN void * user_context)63 dapl_evd_dto_callback(
64 IN ib_hca_handle_t hca_handle,
65 IN ib_cq_handle_t cq_handle,
66 IN void *user_context)
67 {
68 DAPL_EVD *evd_ptr;
69 DAT_RETURN dat_status;
70 DAPL_EVD_STATE state;
71
72 dapl_dbg_log(DAPL_DBG_TYPE_CALLBACK,
73 "dapl_evd_dto_callback(%p, %p, %p)\n",
74 hca_handle,
75 cq_handle,
76 user_context);
77
78 evd_ptr = (DAPL_EVD *) user_context;
79
80 dapl_os_assert(hca_handle ==
81 evd_ptr->header.owner_ia->hca_ptr->ib_hca_handle);
82 dapl_os_assert(evd_ptr->ib_cq_handle == cq_handle);
83 dapl_os_assert(evd_ptr->header.magic == DAPL_MAGIC_EVD);
84
85 /* Read once. */
86 state = *(volatile DAPL_EVD_STATE *) &evd_ptr->evd_state;
87
88 dapl_dbg_log(DAPL_DBG_TYPE_EVD,
89 "-- dapl_evd_dto_callback: CQ %p, state %x\n",
90 (void *)evd_ptr->ib_cq_handle,
91 state);
92
93 /*
94 * This function does not dequeue from the CQ; only the consumer
95 * can do that. Instead, it wakes up waiters if any exist.
96 * It rearms the completion only if completions should always occur
97 * (specifically if a CNO is associated with the EVD and the
98 * EVD is enabled.
99 */
100
101 if (state == DAPL_EVD_STATE_WAITED) {
102 /*
103 * If we could, it would be best to avoid this wakeup
104 * (and the context switch) unless the number of events/CQs
105 * waiting for the waiter was its threshold. We don't
106 * currently have the ability to determine that without
107 * dequeueing the events, and we can't do that for
108 * synchronization reasons (racing with the waiter waking
109 * up and dequeuing, sparked by other callbacks).
110 */
111
112 /*
113 * We don't need to worry about taking the lock for the
114 * wakeup because wakeups are sticky.
115 */
116 (void) dapl_os_wait_object_wakeup(&evd_ptr->wait_object);
117 } else if (state == DAPL_EVD_STATE_OPEN) {
118 DAPL_CNO *cno = evd_ptr->cno_ptr;
119 if (evd_ptr->evd_enabled && (evd_ptr->cno_ptr != NULL)) {
120 /*
121 * Re-enable callback, *then* trigger.
122 * This guarantees we won't miss any events.
123 */
124 dat_status = DAPL_NOTIFY(evd_ptr)(
125 evd_ptr->ib_cq_handle, IB_NOTIFY_ON_NEXT_COMP, 0);
126
127 if (DAT_SUCCESS != dat_status) {
128 (void) dapls_evd_post_async_error_event(
129 evd_ptr->header.owner_ia->async_error_evd,
130 DAT_ASYNC_ERROR_PROVIDER_INTERNAL_ERROR,
131 (DAT_IA_HANDLE)evd_ptr->header.owner_ia);
132 }
133
134 dapl_cno_trigger(cno, evd_ptr);
135 }
136 }
137 dapl_dbg_log(DAPL_DBG_TYPE_RTN, "dapl_evd_dto_callback() returns\n");
138 }
139
140 /*
141 * Local variables:
142 * c-indent-level: 4
143 * c-basic-offset: 4
144 * tab-width: 8
145 * End:
146 */
147