ctl_frontend.c revision 260477 
1/*-
2 * Copyright (c) 2003 Silicon Graphics International Corp.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions, and the following disclaimer,
10 *    without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *    substantially similar to the "NO WARRANTY" disclaimer below
13 *    ("Disclaimer") and any redistribution must be conditioned upon
14 *    including a substantially similar Disclaimer requirement for further
15 *    binary redistribution.
16 *
17 * NO WARRANTY
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGES.
29 *
30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend.c#4 $
31 */
32/*
33 * CAM Target Layer front end interface code
34 *
35 * Author: Ken Merry <ken@FreeBSD.org>
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: stable/10/sys/cam/ctl/ctl_frontend.c 260477 2014-01-09 10:59:31Z mav $");
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/kernel.h>
44#include <sys/types.h>
45#include <sys/malloc.h>
46#include <sys/lock.h>
47#include <sys/mutex.h>
48#include <sys/condvar.h>
49#include <sys/endian.h>
50#include <sys/queue.h>
51#include <sys/sysctl.h>
52
53#include <cam/scsi/scsi_all.h>
54#include <cam/scsi/scsi_da.h>
55#include <cam/ctl/ctl_io.h>
56#include <cam/ctl/ctl.h>
57#include <cam/ctl/ctl_frontend.h>
58#include <cam/ctl/ctl_frontend_internal.h>
59#include <cam/ctl/ctl_backend.h>
60/* XXX KDM move defines from ctl_ioctl.h to somewhere else */
61#include <cam/ctl/ctl_ioctl.h>
62#include <cam/ctl/ctl_ha.h>
63#include <cam/ctl/ctl_private.h>
64#include <cam/ctl/ctl_debug.h>
65
66extern struct ctl_softc *control_softc;
67
68int
69ctl_frontend_register(struct ctl_frontend *fe, int master_shelf)
70{
71	struct ctl_io_pool *pool;
72	int port_num;
73	int retval;
74
75	retval = 0;
76
77	KASSERT(control_softc != NULL, ("CTL is not initialized"));
78
79	mtx_lock(&control_softc->ctl_lock);
80	port_num = ctl_ffz(&control_softc->ctl_port_mask, CTL_MAX_PORTS);
81	if ((port_num == -1)
82	 || (ctl_set_mask(&control_softc->ctl_port_mask, port_num) == -1)) {
83		fe->targ_port = -1;
84		mtx_unlock(&control_softc->ctl_lock);
85		return (1);
86	}
87	control_softc->num_frontends++;
88
89	mtx_unlock(&control_softc->ctl_lock);
90	/*
91	 * We add 20 to whatever the caller requests, so he doesn't get
92	 * burned by queueing things back to the pending sense queue.  In
93	 * theory, there should probably only be one outstanding item, at
94	 * most, on the pending sense queue for a LUN.  We'll clear the
95	 * pending sense queue on the next command, whether or not it is
96	 * a REQUEST SENSE.
97	 */
98	retval = ctl_pool_create(control_softc,
99				 (fe->port_type != CTL_PORT_IOCTL) ?
100				 CTL_POOL_FETD : CTL_POOL_IOCTL,
101				 fe->num_requested_ctl_io + 20, &pool);
102	if (retval != 0) {
103		fe->targ_port = -1;
104		mtx_lock(&control_softc->ctl_lock);
105		ctl_clear_mask(&control_softc->ctl_port_mask, port_num);
106		mtx_unlock(&control_softc->ctl_lock);
107		return (retval);
108	}
109
110	mtx_lock(&control_softc->ctl_lock);
111
112	/* For now assume master shelf */
113	//fe->targ_port = port_num;
114	fe->targ_port = port_num + (master_shelf!=0 ? 0 : CTL_MAX_PORTS);
115	fe->max_initiators = CTL_MAX_INIT_PER_PORT;
116	STAILQ_INSERT_TAIL(&control_softc->fe_list, fe, links);
117	control_softc->ctl_ports[port_num] = fe;
118
119	mtx_unlock(&control_softc->ctl_lock);
120
121	fe->ctl_pool_ref = pool;
122
123	return (retval);
124}
125
126int
127ctl_frontend_deregister(struct ctl_frontend *fe)
128{
129	struct ctl_io_pool *pool;
130	int port_num;
131	int retval;
132
133	retval = 0;
134
135	pool = (struct ctl_io_pool *)fe->ctl_pool_ref;
136
137	if (fe->targ_port == -1) {
138		retval = 1;
139		goto bailout;
140	}
141
142	mtx_lock(&control_softc->ctl_lock);
143	STAILQ_REMOVE(&control_softc->fe_list, fe, ctl_frontend, links);
144	control_softc->num_frontends--;
145	port_num = (fe->targ_port < CTL_MAX_PORTS) ? fe->targ_port :
146	                                             fe->targ_port - CTL_MAX_PORTS;
147	ctl_clear_mask(&control_softc->ctl_port_mask, port_num);
148	control_softc->ctl_ports[port_num] = NULL;
149	mtx_unlock(&control_softc->ctl_lock);
150
151	ctl_pool_free(pool);
152
153bailout:
154	return (retval);
155}
156
157void
158ctl_frontend_set_wwns(struct ctl_frontend *fe, int wwnn_valid, uint64_t wwnn,
159		      int wwpn_valid, uint64_t wwpn)
160{
161	if (wwnn_valid)
162		fe->wwnn = wwnn;
163
164	if (wwpn_valid)
165		fe->wwpn = wwpn;
166}
167
168void
169ctl_frontend_online(struct ctl_frontend *fe)
170{
171	fe->port_online(fe->onoff_arg);
172	/* XXX KDM need a lock here? */
173	fe->status |= CTL_PORT_STATUS_ONLINE;
174}
175
176void
177ctl_frontend_offline(struct ctl_frontend *fe)
178{
179	fe->port_offline(fe->onoff_arg);
180	/* XXX KDM need a lock here? */
181	fe->status &= ~CTL_PORT_STATUS_ONLINE;
182}
183
184/*
185 * vim: ts=8
186 */
187