2 * Copyright (c) 2012 The FreeBSD Foundation
5 * This software was developed by Edward Tomasz Napierala under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * iSCSI Common Layer. It's used by both the initiator and target to send
33 * and receive iSCSI PDUs.
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/condvar.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/mutex.h>
46 #include <sys/module.h>
47 #include <sys/queue.h>
49 #include <sys/socket.h>
50 #include <sys/sysctl.h>
51 #include <sys/systm.h>
54 #include <dev/iscsi/icl.h>
55 #include <icl_conn_if.h>
58 TAILQ_ENTRY(icl_module) im_next;
62 int (*im_limits)(struct icl_drv_limits *idl);
63 struct icl_conn *(*im_new_conn)(const char *name,
69 TAILQ_HEAD(, icl_module) sc_modules;
72 static int sysctl_kern_icl_offloads(SYSCTL_HANDLER_ARGS);
73 static MALLOC_DEFINE(M_ICL, "icl", "iSCSI Common Layer");
74 static struct icl_softc *sc;
76 SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD, 0, "iSCSI Common Layer");
78 SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN,
79 &icl_debug, 0, "Enable debug messages");
80 SYSCTL_PROC(_kern_icl, OID_AUTO, offloads,
81 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
82 NULL, false, sysctl_kern_icl_offloads, "A",
83 "List of ICL modules");
84 SYSCTL_PROC(_kern_icl, OID_AUTO, iser_offloads,
85 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
86 NULL, true, sysctl_kern_icl_offloads, "A",
87 "List of iSER ICL modules");
90 sysctl_kern_icl_offloads(SYSCTL_HANDLER_ARGS)
92 const struct icl_module *im;
97 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
99 sx_slock(&sc->sc_lock);
100 TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
101 if (im->im_iser != iser)
103 if (im != TAILQ_FIRST(&sc->sc_modules))
105 sbuf_printf(&sb, "%s", im->im_name);
107 sx_sunlock(&sc->sc_lock);
109 error = sbuf_finish(&sb);
111 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
116 static struct icl_module *
117 icl_find(const char *name, bool iser, bool quiet)
119 struct icl_module *im, *im_max;
121 sx_assert(&sc->sc_lock, SA_LOCKED);
124 * If the name was not specified, pick a module with highest
127 if (name == NULL || name[0] == '\0') {
129 TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
130 if (im->im_iser != iser)
132 if (im_max == NULL ||
133 im->im_priority > im_max->im_priority)
137 if (iser && im_max == NULL && !quiet)
138 ICL_WARN("no iSER-capable offload found");
143 TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
144 if (strcasecmp(im->im_name, name) != 0)
147 if (!im->im_iser && iser && !quiet) {
148 ICL_WARN("offload \"%s\" is not iSER-capable", name);
151 if (im->im_iser && !iser && !quiet) {
152 ICL_WARN("offload \"%s\" is iSER-only", name);
160 ICL_WARN("offload \"%s\" not found", name);
166 icl_new_conn(const char *offload, bool iser, const char *name, struct mtx *lock)
168 struct icl_module *im;
171 sx_slock(&sc->sc_lock);
172 im = icl_find(offload, iser, false);
174 sx_sunlock(&sc->sc_lock);
178 ic = im->im_new_conn(name, lock);
179 sx_sunlock(&sc->sc_lock);
185 icl_limits(const char *offload, bool iser, struct icl_drv_limits *idl)
187 struct icl_module *im;
190 bzero(idl, sizeof(*idl));
191 sx_slock(&sc->sc_lock);
192 im = icl_find(offload, iser, false);
194 sx_sunlock(&sc->sc_lock);
198 error = im->im_limits(idl);
199 sx_sunlock(&sc->sc_lock);
202 * Validate the limits provided by the driver against values allowed by
203 * the iSCSI RFC. 0 means iscsid/ctld should pick a reasonable value.
205 * Note that max_send_dsl is an internal implementation detail and not
208 #define OUT_OF_RANGE(x, lo, hi) ((x) != 0 && ((x) < (lo) || (x) > (hi)))
210 (OUT_OF_RANGE(idl->idl_max_recv_data_segment_length, 512, 16777215) ||
211 OUT_OF_RANGE(idl->idl_max_send_data_segment_length, 512, 16777215) ||
212 OUT_OF_RANGE(idl->idl_max_burst_length, 512, 16777215) ||
213 OUT_OF_RANGE(idl->idl_first_burst_length, 512, 16777215))) {
219 * If both first_burst and max_burst are provided then first_burst must
220 * not exceed max_burst.
222 if (error == 0 && idl->idl_first_burst_length > 0 &&
223 idl->idl_max_burst_length > 0 &&
224 idl->idl_first_burst_length > idl->idl_max_burst_length) {
232 icl_register(const char *offload, bool iser, int priority,
233 int (*limits)(struct icl_drv_limits *),
234 struct icl_conn *(*new_conn)(const char *, struct mtx *))
236 struct icl_module *im;
238 sx_xlock(&sc->sc_lock);
239 im = icl_find(offload, iser, true);
241 ICL_WARN("offload \"%s\" already registered", offload);
242 sx_xunlock(&sc->sc_lock);
246 im = malloc(sizeof(*im), M_ICL, M_ZERO | M_WAITOK);
247 im->im_name = strdup(offload, M_ICL);
249 im->im_priority = priority;
250 im->im_limits = limits;
251 im->im_new_conn = new_conn;
253 TAILQ_INSERT_HEAD(&sc->sc_modules, im, im_next);
254 sx_xunlock(&sc->sc_lock);
256 ICL_DEBUG("offload \"%s\" registered", offload);
261 icl_unregister(const char *offload, bool rdma)
263 struct icl_module *im;
265 sx_xlock(&sc->sc_lock);
266 im = icl_find(offload, rdma, true);
268 ICL_WARN("offload \"%s\" not registered", offload);
269 sx_xunlock(&sc->sc_lock);
273 TAILQ_REMOVE(&sc->sc_modules, im, im_next);
274 sx_xunlock(&sc->sc_lock);
276 free(im->im_name, M_ICL);
279 ICL_DEBUG("offload \"%s\" unregistered", offload);
287 sc = malloc(sizeof(*sc), M_ICL, M_ZERO | M_WAITOK);
288 sx_init(&sc->sc_lock, "icl");
289 TAILQ_INIT(&sc->sc_modules);
298 sx_slock(&sc->sc_lock);
299 KASSERT(TAILQ_EMPTY(&sc->sc_modules), ("still have modules"));
300 sx_sunlock(&sc->sc_lock);
302 sx_destroy(&sc->sc_lock);
309 icl_modevent(module_t mod, int what, void *arg)
316 return (icl_unload());
322 moduledata_t icl_data = {
328 DECLARE_MODULE(icl, icl_data, SI_SUB_DRIVERS, SI_ORDER_FIRST);
329 MODULE_VERSION(icl, 1);