2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2012 The FreeBSD Foundation
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * iSCSI Common Layer. It's used by both the initiator and target to send
34 * and receive iSCSI PDUs.
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/condvar.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
46 #include <sys/mutex.h>
47 #include <sys/module.h>
48 #include <sys/queue.h>
50 #include <sys/socket.h>
51 #include <sys/sysctl.h>
52 #include <sys/systm.h>
55 #include <dev/iscsi/icl.h>
56 #include <icl_conn_if.h>
59 TAILQ_ENTRY(icl_module) im_next;
63 int (*im_limits)(struct icl_drv_limits *idl,
65 struct icl_conn *(*im_new_conn)(const char *name,
71 TAILQ_HEAD(, icl_module) sc_modules;
74 static int sysctl_kern_icl_offloads(SYSCTL_HANDLER_ARGS);
75 static MALLOC_DEFINE(M_ICL, "icl", "iSCSI Common Layer");
76 static struct icl_softc *sc;
78 SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
79 "iSCSI Common Layer");
81 SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN,
82 &icl_debug, 0, "Enable debug messages");
83 SYSCTL_PROC(_kern_icl, OID_AUTO, offloads,
84 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
85 NULL, false, sysctl_kern_icl_offloads, "A",
86 "List of ICL modules");
87 SYSCTL_PROC(_kern_icl, OID_AUTO, iser_offloads,
88 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
89 NULL, true, sysctl_kern_icl_offloads, "A",
90 "List of iSER ICL modules");
93 sysctl_kern_icl_offloads(SYSCTL_HANDLER_ARGS)
95 const struct icl_module *im;
100 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
102 sx_slock(&sc->sc_lock);
103 TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
104 if (im->im_iser != iser)
106 if (im != TAILQ_FIRST(&sc->sc_modules))
108 sbuf_printf(&sb, "%s", im->im_name);
110 sx_sunlock(&sc->sc_lock);
112 error = sbuf_finish(&sb);
114 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
119 static struct icl_module *
120 icl_find(const char *name, bool iser, bool quiet)
122 struct icl_module *im, *im_max;
124 sx_assert(&sc->sc_lock, SA_LOCKED);
127 * If the name was not specified, pick a module with highest
130 if (name == NULL || name[0] == '\0') {
132 TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
133 if (im->im_iser != iser)
135 if (im_max == NULL ||
136 im->im_priority > im_max->im_priority)
140 if (iser && im_max == NULL && !quiet)
141 ICL_WARN("no iSER-capable offload found");
146 TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
147 if (strcasecmp(im->im_name, name) != 0)
150 if (!im->im_iser && iser && !quiet) {
151 ICL_WARN("offload \"%s\" is not iSER-capable", name);
154 if (im->im_iser && !iser && !quiet) {
155 ICL_WARN("offload \"%s\" is iSER-only", name);
163 ICL_WARN("offload \"%s\" not found", name);
169 icl_new_conn(const char *offload, bool iser, const char *name, struct mtx *lock)
171 struct icl_module *im;
174 sx_slock(&sc->sc_lock);
175 im = icl_find(offload, iser, false);
177 sx_sunlock(&sc->sc_lock);
181 ic = im->im_new_conn(name, lock);
182 sx_sunlock(&sc->sc_lock);
188 icl_limits(const char *offload, bool iser, int socket,
189 struct icl_drv_limits *idl)
191 struct icl_module *im;
194 bzero(idl, sizeof(*idl));
195 sx_slock(&sc->sc_lock);
196 im = icl_find(offload, iser, false);
198 sx_sunlock(&sc->sc_lock);
202 error = im->im_limits(idl, socket);
203 sx_sunlock(&sc->sc_lock);
206 * Validate the limits provided by the driver against values allowed by
207 * the iSCSI RFC. 0 means iscsid/ctld should pick a reasonable value.
209 * Note that max_send_dsl is an internal implementation detail and not
212 #define OUT_OF_RANGE(x, lo, hi) ((x) != 0 && ((x) < (lo) || (x) > (hi)))
214 (OUT_OF_RANGE(idl->idl_max_recv_data_segment_length, 512, 16777215) ||
215 OUT_OF_RANGE(idl->idl_max_send_data_segment_length, 512, 16777215) ||
216 OUT_OF_RANGE(idl->idl_max_burst_length, 512, 16777215) ||
217 OUT_OF_RANGE(idl->idl_first_burst_length, 512, 16777215))) {
223 * If both first_burst and max_burst are provided then first_burst must
224 * not exceed max_burst.
226 if (error == 0 && idl->idl_first_burst_length > 0 &&
227 idl->idl_max_burst_length > 0 &&
228 idl->idl_first_burst_length > idl->idl_max_burst_length) {
236 icl_register(const char *offload, bool iser, int priority,
237 int (*limits)(struct icl_drv_limits *, int),
238 struct icl_conn *(*new_conn)(const char *, struct mtx *))
240 struct icl_module *im;
242 sx_xlock(&sc->sc_lock);
243 im = icl_find(offload, iser, true);
245 ICL_WARN("offload \"%s\" already registered", offload);
246 sx_xunlock(&sc->sc_lock);
250 im = malloc(sizeof(*im), M_ICL, M_ZERO | M_WAITOK);
251 im->im_name = strdup(offload, M_ICL);
253 im->im_priority = priority;
254 im->im_limits = limits;
255 im->im_new_conn = new_conn;
257 TAILQ_INSERT_HEAD(&sc->sc_modules, im, im_next);
258 sx_xunlock(&sc->sc_lock);
260 ICL_DEBUG("offload \"%s\" registered", offload);
265 icl_unregister(const char *offload, bool rdma)
267 struct icl_module *im;
269 sx_xlock(&sc->sc_lock);
270 im = icl_find(offload, rdma, true);
272 ICL_WARN("offload \"%s\" not registered", offload);
273 sx_xunlock(&sc->sc_lock);
277 TAILQ_REMOVE(&sc->sc_modules, im, im_next);
278 sx_xunlock(&sc->sc_lock);
280 free(im->im_name, M_ICL);
283 ICL_DEBUG("offload \"%s\" unregistered", offload);
291 sc = malloc(sizeof(*sc), M_ICL, M_ZERO | M_WAITOK);
292 sx_init(&sc->sc_lock, "icl");
293 TAILQ_INIT(&sc->sc_modules);
302 sx_slock(&sc->sc_lock);
303 KASSERT(TAILQ_EMPTY(&sc->sc_modules), ("still have modules"));
304 sx_sunlock(&sc->sc_lock);
306 sx_destroy(&sc->sc_lock);
313 icl_modevent(module_t mod, int what, void *arg)
320 return (icl_unload());
326 moduledata_t icl_data = {
332 DECLARE_MODULE(icl, icl_data, SI_SUB_DRIVERS, SI_ORDER_FIRST);
333 MODULE_VERSION(icl, 1);