e75b8cbe27
ICL drivers. MFC after: 1 month Sponsored by: The FreeBSD Foundation
278 lines
6.3 KiB
C
278 lines
6.3 KiB
C
/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* iSCSI Common Layer. It's used by both the initiator and target to send
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* and receive iSCSI PDUs.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/condvar.h>
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#include <sys/conf.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/module.h>
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#include <sys/queue.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/sx.h>
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#include <dev/iscsi/icl.h>
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#include <icl_conn_if.h>
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struct icl_module {
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TAILQ_ENTRY(icl_module) im_next;
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char *im_name;
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int im_priority;
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int (*im_limits)(size_t *limitp);
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struct icl_conn *(*im_new_conn)(const char *name,
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struct mtx *lock);
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};
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struct icl_softc {
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struct sx sc_lock;
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TAILQ_HEAD(, icl_module) sc_modules;
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};
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static int sysctl_kern_icl_drivers(SYSCTL_HANDLER_ARGS);
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static MALLOC_DEFINE(M_ICL, "icl", "iSCSI Common Layer");
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static struct icl_softc *sc;
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SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD, 0, "iSCSI Common Layer");
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int icl_debug = 1;
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SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN,
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&icl_debug, 0, "Enable debug messages");
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SYSCTL_PROC(_kern_icl, OID_AUTO, drivers,
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
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NULL, 0, sysctl_kern_icl_drivers, "A",
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"List of ICL drivers");
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static int
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sysctl_kern_icl_drivers(SYSCTL_HANDLER_ARGS)
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{
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const struct icl_module *im;
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struct sbuf sb;
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int error;
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sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);
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sx_slock(&sc->sc_lock);
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TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
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if (im != TAILQ_FIRST(&sc->sc_modules))
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sbuf_putc(&sb, ' ');
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sbuf_printf(&sb, "%s", im->im_name);
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}
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sx_sunlock(&sc->sc_lock);
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error = sbuf_finish(&sb);
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if (error == 0)
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error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
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sbuf_delete(&sb);
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return (error);
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}
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static struct icl_module *
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icl_find(const char *name)
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{
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struct icl_module *im, *im_max;
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sx_assert(&sc->sc_lock, SA_LOCKED);
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/*
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* If the name was not specified, pick a module with highest
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* priority.
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*/
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if (name == NULL || name[0] == '\0') {
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im_max = TAILQ_FIRST(&sc->sc_modules);
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TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
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if (im->im_priority > im_max->im_priority)
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im_max = im;
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}
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return (im_max);
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}
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TAILQ_FOREACH(im, &sc->sc_modules, im_next) {
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if (strcasecmp(im->im_name, name) == 0)
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return (im);
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}
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return (NULL);
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}
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struct icl_conn *
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icl_new_conn(const char *offload, const char *name, struct mtx *lock)
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{
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struct icl_module *im;
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struct icl_conn *ic;
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sx_slock(&sc->sc_lock);
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im = icl_find(offload);
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if (im == NULL) {
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ICL_WARN("offload \"%s\" not found", offload);
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sx_sunlock(&sc->sc_lock);
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return (NULL);
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}
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ic = im->im_new_conn(name, lock);
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sx_sunlock(&sc->sc_lock);
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return (ic);
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}
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int
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icl_limits(const char *offload, size_t *limitp)
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{
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struct icl_module *im;
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int error;
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sx_slock(&sc->sc_lock);
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im = icl_find(offload);
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if (im == NULL) {
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ICL_WARN("offload \"%s\" not found", offload);
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sx_sunlock(&sc->sc_lock);
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return (ENXIO);
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}
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error = im->im_limits(limitp);
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sx_sunlock(&sc->sc_lock);
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return (error);
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}
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int
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icl_register(const char *offload, int priority, int (*limits)(size_t *),
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struct icl_conn *(*new_conn)(const char *, struct mtx *))
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{
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struct icl_module *im;
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sx_xlock(&sc->sc_lock);
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im = icl_find(offload);
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if (im != NULL) {
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ICL_WARN("offload \"%s\" already registered", offload);
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sx_xunlock(&sc->sc_lock);
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return (EBUSY);
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}
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im = malloc(sizeof(*im), M_ICL, M_ZERO | M_WAITOK);
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im->im_name = strdup(offload, M_ICL);
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im->im_priority = priority;
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im->im_limits = limits;
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im->im_new_conn = new_conn;
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TAILQ_INSERT_HEAD(&sc->sc_modules, im, im_next);
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sx_xunlock(&sc->sc_lock);
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ICL_DEBUG("offload \"%s\" registered", offload);
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return (0);
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}
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int
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icl_unregister(const char *offload)
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{
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struct icl_module *im;
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sx_xlock(&sc->sc_lock);
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im = icl_find(offload);
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if (im == NULL) {
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ICL_WARN("offload \"%s\" not registered", offload);
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sx_xunlock(&sc->sc_lock);
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return (ENXIO);
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}
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TAILQ_REMOVE(&sc->sc_modules, im, im_next);
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sx_xunlock(&sc->sc_lock);
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free(im->im_name, M_ICL);
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free(im, M_ICL);
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ICL_DEBUG("offload \"%s\" unregistered", offload);
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return (0);
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}
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static int
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icl_load(void)
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{
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sc = malloc(sizeof(*sc), M_ICL, M_ZERO | M_WAITOK);
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sx_init(&sc->sc_lock, "icl");
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TAILQ_INIT(&sc->sc_modules);
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return (0);
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}
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static int
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icl_unload(void)
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{
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sx_slock(&sc->sc_lock);
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KASSERT(TAILQ_EMPTY(&sc->sc_modules), ("still have modules"));
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sx_sunlock(&sc->sc_lock);
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sx_destroy(&sc->sc_lock);
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free(sc, M_ICL);
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return (0);
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}
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static int
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icl_modevent(module_t mod, int what, void *arg)
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{
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switch (what) {
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case MOD_LOAD:
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return (icl_load());
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case MOD_UNLOAD:
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return (icl_unload());
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default:
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return (EINVAL);
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}
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}
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moduledata_t icl_data = {
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"icl",
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icl_modevent,
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0
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};
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DECLARE_MODULE(icl, icl_data, SI_SUB_DRIVERS, SI_ORDER_FIRST);
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MODULE_VERSION(icl, 1);
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