12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313 |
- /*
- * iSCSI transport class definitions
- *
- * Copyright (C) IBM Corporation, 2004
- * Copyright (C) Mike Christie, 2004 - 2005
- * Copyright (C) Dmitry Yusupov, 2004 - 2005
- * Copyright (C) Alex Aizman, 2004 - 2005
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- #include <linux/module.h>
- #include <linux/mempool.h>
- #include <linux/mutex.h>
- #include <net/tcp.h>
- #include <scsi/scsi.h>
- #include <scsi/scsi_host.h>
- #include <scsi/scsi_device.h>
- #include <scsi/scsi_transport.h>
- #include <scsi/scsi_transport_iscsi.h>
- #include <scsi/iscsi_if.h>
- #define ISCSI_SESSION_ATTRS 8
- #define ISCSI_CONN_ATTRS 6
- struct iscsi_internal {
- struct scsi_transport_template t;
- struct iscsi_transport *iscsi_transport;
- struct list_head list;
- /*
- * based on transport capabilities, at register time we set these
- * bits to tell the transport class it wants attributes displayed
- * in sysfs or that it can support different iSCSI Data-Path
- * capabilities
- */
- uint32_t param_mask;
- struct class_device cdev;
- /*
- * We do not have any private or other attrs.
- */
- struct transport_container conn_cont;
- struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
- struct transport_container session_cont;
- struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
- };
- /*
- * list of registered transports and lock that must
- * be held while accessing list. The iscsi_transport_lock must
- * be acquired after the rx_queue_mutex.
- */
- static LIST_HEAD(iscsi_transports);
- static DEFINE_SPINLOCK(iscsi_transport_lock);
- #define to_iscsi_internal(tmpl) \
- container_of(tmpl, struct iscsi_internal, t)
- #define cdev_to_iscsi_internal(_cdev) \
- container_of(_cdev, struct iscsi_internal, cdev)
- static void iscsi_transport_release(struct class_device *cdev)
- {
- struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
- kfree(priv);
- }
- /*
- * iscsi_transport_class represents the iscsi_transports that are
- * registered.
- */
- static struct class iscsi_transport_class = {
- .name = "iscsi_transport",
- .release = iscsi_transport_release,
- };
- static ssize_t
- show_transport_handle(struct class_device *cdev, char *buf)
- {
- struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
- return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
- }
- static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
- #define show_transport_attr(name, format) \
- static ssize_t \
- show_transport_##name(struct class_device *cdev, char *buf) \
- { \
- struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \
- return sprintf(buf, format"\n", priv->iscsi_transport->name); \
- } \
- static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
- show_transport_attr(caps, "0x%x");
- show_transport_attr(max_lun, "%d");
- show_transport_attr(max_conn, "%d");
- show_transport_attr(max_cmd_len, "%d");
- static struct attribute *iscsi_transport_attrs[] = {
- &class_device_attr_handle.attr,
- &class_device_attr_caps.attr,
- &class_device_attr_max_lun.attr,
- &class_device_attr_max_conn.attr,
- &class_device_attr_max_cmd_len.attr,
- NULL,
- };
- static struct attribute_group iscsi_transport_group = {
- .attrs = iscsi_transport_attrs,
- };
- static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
- "iscsi_session",
- NULL,
- NULL,
- NULL);
- static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
- "iscsi_connection",
- NULL,
- NULL,
- NULL);
- static struct sock *nls;
- static int daemon_pid;
- static DEFINE_MUTEX(rx_queue_mutex);
- struct mempool_zone {
- mempool_t *pool;
- atomic_t allocated;
- int size;
- int hiwat;
- struct list_head freequeue;
- spinlock_t freelock;
- };
- static struct mempool_zone *z_reply;
- /*
- * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
- * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM
- * so daemon will notice OOM on NETLINK tranposrt level and will
- * be able to predict or change operational behavior
- */
- #define Z_MAX_REPLY 8
- #define Z_HIWAT_REPLY 6
- #define Z_MAX_PDU 8
- #define Z_HIWAT_PDU 6
- #define Z_MAX_ERROR 16
- #define Z_HIWAT_ERROR 12
- static LIST_HEAD(sesslist);
- static DEFINE_SPINLOCK(sesslock);
- static LIST_HEAD(connlist);
- static DEFINE_SPINLOCK(connlock);
- static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle)
- {
- unsigned long flags;
- struct iscsi_cls_session *sess;
- spin_lock_irqsave(&sesslock, flags);
- list_for_each_entry(sess, &sesslist, sess_list) {
- if (sess == iscsi_ptr(handle)) {
- spin_unlock_irqrestore(&sesslock, flags);
- return sess;
- }
- }
- spin_unlock_irqrestore(&sesslock, flags);
- return NULL;
- }
- static struct iscsi_cls_conn *iscsi_conn_lookup(uint64_t handle)
- {
- unsigned long flags;
- struct iscsi_cls_conn *conn;
- spin_lock_irqsave(&connlock, flags);
- list_for_each_entry(conn, &connlist, conn_list) {
- if (conn == iscsi_ptr(handle)) {
- spin_unlock_irqrestore(&connlock, flags);
- return conn;
- }
- }
- spin_unlock_irqrestore(&connlock, flags);
- return NULL;
- }
- /*
- * The following functions can be used by LLDs that allocate
- * their own scsi_hosts or by software iscsi LLDs
- */
- static void iscsi_session_release(struct device *dev)
- {
- struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
- struct iscsi_transport *transport = session->transport;
- struct Scsi_Host *shost;
- shost = iscsi_session_to_shost(session);
- scsi_host_put(shost);
- kfree(session);
- module_put(transport->owner);
- }
- static int iscsi_is_session_dev(const struct device *dev)
- {
- return dev->release == iscsi_session_release;
- }
- /**
- * iscsi_create_session - create iscsi class session
- * @shost: scsi host
- * @transport: iscsi transport
- *
- * This can be called from a LLD or iscsi_transport
- **/
- struct iscsi_cls_session *
- iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport)
- {
- struct iscsi_cls_session *session;
- int err;
- if (!try_module_get(transport->owner))
- return NULL;
- session = kzalloc(sizeof(*session), GFP_KERNEL);
- if (!session)
- goto module_put;
- session->transport = transport;
- /* this is released in the dev's release function */
- scsi_host_get(shost);
- snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no);
- session->dev.parent = &shost->shost_gendev;
- session->dev.release = iscsi_session_release;
- err = device_register(&session->dev);
- if (err) {
- dev_printk(KERN_ERR, &session->dev, "iscsi: could not "
- "register session's dev\n");
- goto free_session;
- }
- transport_register_device(&session->dev);
- return session;
- free_session:
- kfree(session);
- module_put:
- module_put(transport->owner);
- return NULL;
- }
- EXPORT_SYMBOL_GPL(iscsi_create_session);
- /**
- * iscsi_destroy_session - destroy iscsi session
- * @session: iscsi_session
- *
- * Can be called by a LLD or iscsi_transport. There must not be
- * any running connections.
- **/
- int iscsi_destroy_session(struct iscsi_cls_session *session)
- {
- transport_unregister_device(&session->dev);
- device_unregister(&session->dev);
- return 0;
- }
- EXPORT_SYMBOL_GPL(iscsi_destroy_session);
- static void iscsi_conn_release(struct device *dev)
- {
- struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
- struct device *parent = conn->dev.parent;
- kfree(conn);
- put_device(parent);
- }
- static int iscsi_is_conn_dev(const struct device *dev)
- {
- return dev->release == iscsi_conn_release;
- }
- /**
- * iscsi_create_conn - create iscsi class connection
- * @session: iscsi cls session
- * @cid: connection id
- *
- * This can be called from a LLD or iscsi_transport. The connection
- * is child of the session so cid must be unique for all connections
- * on the session.
- **/
- struct iscsi_cls_conn *
- iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
- {
- struct iscsi_transport *transport = session->transport;
- struct Scsi_Host *shost = iscsi_session_to_shost(session);
- struct iscsi_cls_conn *conn;
- int err;
- conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
- if (!conn)
- return NULL;
- if (transport->conndata_size)
- conn->dd_data = &conn[1];
- INIT_LIST_HEAD(&conn->conn_list);
- conn->transport = transport;
- /* this is released in the dev's release function */
- if (!get_device(&session->dev))
- goto free_conn;
- snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
- shost->host_no, cid);
- conn->dev.parent = &session->dev;
- conn->dev.release = iscsi_conn_release;
- err = device_register(&conn->dev);
- if (err) {
- dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register "
- "connection's dev\n");
- goto release_parent_ref;
- }
- transport_register_device(&conn->dev);
- return conn;
- release_parent_ref:
- put_device(&session->dev);
- free_conn:
- kfree(conn);
- return NULL;
- }
- EXPORT_SYMBOL_GPL(iscsi_create_conn);
- /**
- * iscsi_destroy_conn - destroy iscsi class connection
- * @session: iscsi cls session
- *
- * This can be called from a LLD or iscsi_transport.
- **/
- int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
- {
- transport_unregister_device(&conn->dev);
- device_unregister(&conn->dev);
- return 0;
- }
- EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
- /*
- * These functions are used only by software iscsi_transports
- * which do not allocate and more their scsi_hosts since this
- * is initiated from userspace.
- */
- /*
- * iSCSI Session's hostdata organization:
- *
- * *------------------* <== hostdata_session(host->hostdata)
- * | ptr to class sess|
- * |------------------| <== iscsi_hostdata(host->hostdata)
- * | transport's data |
- * *------------------*
- */
- #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \
- _t->hostdata_size % sizeof(unsigned long))
- #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
- /**
- * iscsi_transport_create_session - create iscsi cls session and host
- * scsit: scsi transport template
- * transport: iscsi transport template
- *
- * This can be used by software iscsi_transports that allocate
- * a session per scsi host.
- **/
- struct Scsi_Host *
- iscsi_transport_create_session(struct scsi_transport_template *scsit,
- struct iscsi_transport *transport)
- {
- struct iscsi_cls_session *session;
- struct Scsi_Host *shost;
- unsigned long flags;
- shost = scsi_host_alloc(transport->host_template,
- hostdata_privsize(transport));
- if (!shost) {
- printk(KERN_ERR "iscsi: can not allocate SCSI host for "
- "session\n");
- return NULL;
- }
- shost->max_id = 1;
- shost->max_channel = 0;
- shost->max_lun = transport->max_lun;
- shost->max_cmd_len = transport->max_cmd_len;
- shost->transportt = scsit;
- shost->transportt->create_work_queue = 1;
- if (scsi_add_host(shost, NULL))
- goto free_host;
- session = iscsi_create_session(shost, transport);
- if (!session)
- goto remove_host;
- *(unsigned long*)shost->hostdata = (unsigned long)session;
- spin_lock_irqsave(&sesslock, flags);
- list_add(&session->sess_list, &sesslist);
- spin_unlock_irqrestore(&sesslock, flags);
- return shost;
- remove_host:
- scsi_remove_host(shost);
- free_host:
- scsi_host_put(shost);
- return NULL;
- }
- EXPORT_SYMBOL_GPL(iscsi_transport_create_session);
- /**
- * iscsi_transport_destroy_session - destroy session and scsi host
- * shost: scsi host
- *
- * This can be used by software iscsi_transports that allocate
- * a session per scsi host.
- **/
- int iscsi_transport_destroy_session(struct Scsi_Host *shost)
- {
- struct iscsi_cls_session *session;
- unsigned long flags;
- scsi_remove_host(shost);
- session = hostdata_session(shost->hostdata);
- spin_lock_irqsave(&sesslock, flags);
- list_del(&session->sess_list);
- spin_unlock_irqrestore(&sesslock, flags);
- iscsi_destroy_session(session);
- /* ref from host alloc */
- scsi_host_put(shost);
- return 0;
- }
- EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session);
- /*
- * iscsi interface functions
- */
- static struct iscsi_internal *
- iscsi_if_transport_lookup(struct iscsi_transport *tt)
- {
- struct iscsi_internal *priv;
- unsigned long flags;
- spin_lock_irqsave(&iscsi_transport_lock, flags);
- list_for_each_entry(priv, &iscsi_transports, list) {
- if (tt == priv->iscsi_transport) {
- spin_unlock_irqrestore(&iscsi_transport_lock, flags);
- return priv;
- }
- }
- spin_unlock_irqrestore(&iscsi_transport_lock, flags);
- return NULL;
- }
- static inline struct list_head *skb_to_lh(struct sk_buff *skb)
- {
- return (struct list_head *)&skb->cb;
- }
- static void*
- mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data)
- {
- struct mempool_zone *zone = pool_data;
- return alloc_skb(zone->size, gfp_mask);
- }
- static void
- mempool_zone_free_skb(void *element, void *pool_data)
- {
- kfree_skb(element);
- }
- static void
- mempool_zone_complete(struct mempool_zone *zone)
- {
- unsigned long flags;
- struct list_head *lh, *n;
- spin_lock_irqsave(&zone->freelock, flags);
- list_for_each_safe(lh, n, &zone->freequeue) {
- struct sk_buff *skb = (struct sk_buff *)((char *)lh -
- offsetof(struct sk_buff, cb));
- if (!skb_shared(skb)) {
- list_del(skb_to_lh(skb));
- mempool_free(skb, zone->pool);
- atomic_dec(&zone->allocated);
- }
- }
- spin_unlock_irqrestore(&zone->freelock, flags);
- }
- static struct mempool_zone *
- mempool_zone_init(unsigned max, unsigned size, unsigned hiwat)
- {
- struct mempool_zone *zp;
- zp = kzalloc(sizeof(*zp), GFP_KERNEL);
- if (!zp)
- return NULL;
- zp->size = size;
- zp->hiwat = hiwat;
- INIT_LIST_HEAD(&zp->freequeue);
- spin_lock_init(&zp->freelock);
- atomic_set(&zp->allocated, 0);
- zp->pool = mempool_create(max, mempool_zone_alloc_skb,
- mempool_zone_free_skb, zp);
- if (!zp->pool) {
- kfree(zp);
- return NULL;
- }
- return zp;
- }
- static void mempool_zone_destroy(struct mempool_zone *zp)
- {
- mempool_destroy(zp->pool);
- kfree(zp);
- }
- static struct sk_buff*
- mempool_zone_get_skb(struct mempool_zone *zone)
- {
- struct sk_buff *skb;
- skb = mempool_alloc(zone->pool, GFP_ATOMIC);
- if (skb)
- atomic_inc(&zone->allocated);
- return skb;
- }
- static int
- iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb)
- {
- unsigned long flags;
- int rc;
- skb_get(skb);
- rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
- if (rc < 0) {
- mempool_free(skb, zone->pool);
- printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
- return rc;
- }
- spin_lock_irqsave(&zone->freelock, flags);
- list_add(skb_to_lh(skb), &zone->freequeue);
- spin_unlock_irqrestore(&zone->freelock, flags);
- return 0;
- }
- int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
- char *data, uint32_t data_size)
- {
- struct nlmsghdr *nlh;
- struct sk_buff *skb;
- struct iscsi_uevent *ev;
- char *pdu;
- int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
- data_size);
- mempool_zone_complete(conn->z_pdu);
- skb = mempool_zone_get_skb(conn->z_pdu);
- if (!skb) {
- iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
- dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver "
- "control PDU: OOM\n");
- return -ENOMEM;
- }
- nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
- ev = NLMSG_DATA(nlh);
- memset(ev, 0, sizeof(*ev));
- ev->transport_handle = iscsi_handle(conn->transport);
- ev->type = ISCSI_KEVENT_RECV_PDU;
- if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
- ev->iferror = -ENOMEM;
- ev->r.recv_req.conn_handle = iscsi_handle(conn);
- pdu = (char*)ev + sizeof(*ev);
- memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
- memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
- return iscsi_unicast_skb(conn->z_pdu, skb);
- }
- EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
- void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
- {
- struct nlmsghdr *nlh;
- struct sk_buff *skb;
- struct iscsi_uevent *ev;
- int len = NLMSG_SPACE(sizeof(*ev));
- mempool_zone_complete(conn->z_error);
- skb = mempool_zone_get_skb(conn->z_error);
- if (!skb) {
- dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored "
- "conn error (%d)\n", error);
- return;
- }
- nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
- ev = NLMSG_DATA(nlh);
- ev->transport_handle = iscsi_handle(conn->transport);
- ev->type = ISCSI_KEVENT_CONN_ERROR;
- if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat)
- ev->iferror = -ENOMEM;
- ev->r.connerror.error = error;
- ev->r.connerror.conn_handle = iscsi_handle(conn);
- iscsi_unicast_skb(conn->z_error, skb);
- dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n",
- error);
- }
- EXPORT_SYMBOL_GPL(iscsi_conn_error);
- static int
- iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
- void *payload, int size)
- {
- struct sk_buff *skb;
- struct nlmsghdr *nlh;
- int len = NLMSG_SPACE(size);
- int flags = multi ? NLM_F_MULTI : 0;
- int t = done ? NLMSG_DONE : type;
- mempool_zone_complete(z_reply);
- skb = mempool_zone_get_skb(z_reply);
- /*
- * FIXME:
- * user is supposed to react on iferror == -ENOMEM;
- * see iscsi_if_rx().
- */
- BUG_ON(!skb);
- nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
- nlh->nlmsg_flags = flags;
- memcpy(NLMSG_DATA(nlh), payload, size);
- return iscsi_unicast_skb(z_reply, skb);
- }
- static int
- iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
- {
- struct iscsi_uevent *ev = NLMSG_DATA(nlh);
- struct iscsi_stats *stats;
- struct sk_buff *skbstat;
- struct iscsi_cls_conn *conn;
- struct nlmsghdr *nlhstat;
- struct iscsi_uevent *evstat;
- int len = NLMSG_SPACE(sizeof(*ev) +
- sizeof(struct iscsi_stats) +
- sizeof(struct iscsi_stats_custom) *
- ISCSI_STATS_CUSTOM_MAX);
- int err = 0;
- conn = iscsi_conn_lookup(ev->u.get_stats.conn_handle);
- if (!conn)
- return -EEXIST;
- do {
- int actual_size;
- mempool_zone_complete(conn->z_pdu);
- skbstat = mempool_zone_get_skb(conn->z_pdu);
- if (!skbstat) {
- dev_printk(KERN_ERR, &conn->dev, "iscsi: can not "
- "deliver stats: OOM\n");
- return -ENOMEM;
- }
- nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0,
- (len - sizeof(*nlhstat)), 0);
- evstat = NLMSG_DATA(nlhstat);
- memset(evstat, 0, sizeof(*evstat));
- evstat->transport_handle = iscsi_handle(conn->transport);
- evstat->type = nlh->nlmsg_type;
- if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
- evstat->iferror = -ENOMEM;
- evstat->u.get_stats.conn_handle =
- ev->u.get_stats.conn_handle;
- stats = (struct iscsi_stats *)
- ((char*)evstat + sizeof(*evstat));
- memset(stats, 0, sizeof(*stats));
- transport->get_stats(conn, stats);
- actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
- sizeof(struct iscsi_stats) +
- sizeof(struct iscsi_stats_custom) *
- stats->custom_length);
- actual_size -= sizeof(*nlhstat);
- actual_size = NLMSG_LENGTH(actual_size);
- skb_trim(skbstat, NLMSG_ALIGN(actual_size));
- nlhstat->nlmsg_len = actual_size;
- err = iscsi_unicast_skb(conn->z_pdu, skbstat);
- } while (err < 0 && err != -ECONNREFUSED);
- return err;
- }
- static int
- iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
- {
- struct iscsi_transport *transport = priv->iscsi_transport;
- struct iscsi_cls_session *session;
- uint32_t sid;
- session = transport->create_session(&priv->t,
- ev->u.c_session.initial_cmdsn,
- &sid);
- if (!session)
- return -ENOMEM;
- ev->r.c_session_ret.session_handle = iscsi_handle(session);
- ev->r.c_session_ret.sid = sid;
- return 0;
- }
- static int
- iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
- {
- struct iscsi_cls_conn *conn;
- struct iscsi_cls_session *session;
- unsigned long flags;
- session = iscsi_session_lookup(ev->u.c_conn.session_handle);
- if (!session)
- return -EINVAL;
- conn = transport->create_conn(session, ev->u.c_conn.cid);
- if (!conn)
- return -ENOMEM;
- conn->z_pdu = mempool_zone_init(Z_MAX_PDU,
- NLMSG_SPACE(sizeof(struct iscsi_uevent) +
- sizeof(struct iscsi_hdr) +
- DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH),
- Z_HIWAT_PDU);
- if (!conn->z_pdu) {
- dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
- "pdu zone for new conn\n");
- goto destroy_conn;
- }
- conn->z_error = mempool_zone_init(Z_MAX_ERROR,
- NLMSG_SPACE(sizeof(struct iscsi_uevent)),
- Z_HIWAT_ERROR);
- if (!conn->z_error) {
- dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
- "error zone for new conn\n");
- goto free_pdu_pool;
- }
- ev->r.handle = iscsi_handle(conn);
- spin_lock_irqsave(&connlock, flags);
- list_add(&conn->conn_list, &connlist);
- conn->active = 1;
- spin_unlock_irqrestore(&connlock, flags);
- return 0;
- free_pdu_pool:
- mempool_zone_destroy(conn->z_pdu);
- destroy_conn:
- if (transport->destroy_conn)
- transport->destroy_conn(conn->dd_data);
- return -ENOMEM;
- }
- static int
- iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
- {
- unsigned long flags;
- struct iscsi_cls_conn *conn;
- struct mempool_zone *z_error, *z_pdu;
- conn = iscsi_conn_lookup(ev->u.d_conn.conn_handle);
- if (!conn)
- return -EINVAL;
- spin_lock_irqsave(&connlock, flags);
- conn->active = 0;
- list_del(&conn->conn_list);
- spin_unlock_irqrestore(&connlock, flags);
- z_pdu = conn->z_pdu;
- z_error = conn->z_error;
- if (transport->destroy_conn)
- transport->destroy_conn(conn);
- mempool_zone_destroy(z_pdu);
- mempool_zone_destroy(z_error);
- return 0;
- }
- static int
- iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
- {
- int err = 0;
- struct iscsi_uevent *ev = NLMSG_DATA(nlh);
- struct iscsi_transport *transport = NULL;
- struct iscsi_internal *priv;
- struct iscsi_cls_session *session;
- struct iscsi_cls_conn *conn;
- priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
- if (!priv)
- return -EINVAL;
- transport = priv->iscsi_transport;
- if (!try_module_get(transport->owner))
- return -EINVAL;
- switch (nlh->nlmsg_type) {
- case ISCSI_UEVENT_CREATE_SESSION:
- err = iscsi_if_create_session(priv, ev);
- break;
- case ISCSI_UEVENT_DESTROY_SESSION:
- session = iscsi_session_lookup(ev->u.d_session.session_handle);
- if (session)
- transport->destroy_session(session);
- else
- err = -EINVAL;
- break;
- case ISCSI_UEVENT_CREATE_CONN:
- err = iscsi_if_create_conn(transport, ev);
- break;
- case ISCSI_UEVENT_DESTROY_CONN:
- err = iscsi_if_destroy_conn(transport, ev);
- break;
- case ISCSI_UEVENT_BIND_CONN:
- session = iscsi_session_lookup(ev->u.b_conn.session_handle);
- conn = iscsi_conn_lookup(ev->u.b_conn.conn_handle);
- if (session && conn)
- ev->r.retcode = transport->bind_conn(session, conn,
- ev->u.b_conn.transport_fd,
- ev->u.b_conn.is_leading);
- else
- err = -EINVAL;
- break;
- case ISCSI_UEVENT_SET_PARAM:
- conn = iscsi_conn_lookup(ev->u.set_param.conn_handle);
- if (conn)
- ev->r.retcode = transport->set_param(conn,
- ev->u.set_param.param, ev->u.set_param.value);
- else
- err = -EINVAL;
- break;
- case ISCSI_UEVENT_START_CONN:
- conn = iscsi_conn_lookup(ev->u.start_conn.conn_handle);
- if (conn)
- ev->r.retcode = transport->start_conn(conn);
- else
- err = -EINVAL;
- break;
- case ISCSI_UEVENT_STOP_CONN:
- conn = iscsi_conn_lookup(ev->u.stop_conn.conn_handle);
- if (conn)
- transport->stop_conn(conn, ev->u.stop_conn.flag);
- else
- err = -EINVAL;
- break;
- case ISCSI_UEVENT_SEND_PDU:
- conn = iscsi_conn_lookup(ev->u.send_pdu.conn_handle);
- if (conn)
- ev->r.retcode = transport->send_pdu(conn,
- (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
- (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
- ev->u.send_pdu.data_size);
- else
- err = -EINVAL;
- break;
- case ISCSI_UEVENT_GET_STATS:
- err = iscsi_if_get_stats(transport, nlh);
- break;
- default:
- err = -EINVAL;
- break;
- }
- module_put(transport->owner);
- return err;
- }
- /* Get message from skb (based on rtnetlink_rcv_skb). Each message is
- * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are
- * or invalid creds discarded silently. */
- static void
- iscsi_if_rx(struct sock *sk, int len)
- {
- struct sk_buff *skb;
- mutex_lock(&rx_queue_mutex);
- while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
- if (NETLINK_CREDS(skb)->uid) {
- skb_pull(skb, skb->len);
- goto free_skb;
- }
- daemon_pid = NETLINK_CREDS(skb)->pid;
- while (skb->len >= NLMSG_SPACE(0)) {
- int err;
- uint32_t rlen;
- struct nlmsghdr *nlh;
- struct iscsi_uevent *ev;
- nlh = (struct nlmsghdr *)skb->data;
- if (nlh->nlmsg_len < sizeof(*nlh) ||
- skb->len < nlh->nlmsg_len) {
- break;
- }
- ev = NLMSG_DATA(nlh);
- rlen = NLMSG_ALIGN(nlh->nlmsg_len);
- if (rlen > skb->len)
- rlen = skb->len;
- err = iscsi_if_recv_msg(skb, nlh);
- if (err) {
- ev->type = ISCSI_KEVENT_IF_ERROR;
- ev->iferror = err;
- }
- do {
- /*
- * special case for GET_STATS:
- * on success - sending reply and stats from
- * inside of if_recv_msg(),
- * on error - fall through.
- */
- if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
- break;
- err = iscsi_if_send_reply(
- NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
- nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
- if (atomic_read(&z_reply->allocated) >=
- z_reply->hiwat)
- ev->iferror = -ENOMEM;
- } while (err < 0 && err != -ECONNREFUSED);
- skb_pull(skb, rlen);
- }
- free_skb:
- kfree_skb(skb);
- }
- mutex_unlock(&rx_queue_mutex);
- }
- #define iscsi_cdev_to_conn(_cdev) \
- iscsi_dev_to_conn(_cdev->dev)
- /*
- * iSCSI connection attrs
- */
- #define iscsi_conn_int_attr_show(param, format) \
- static ssize_t \
- show_conn_int_param_##param(struct class_device *cdev, char *buf) \
- { \
- uint32_t value = 0; \
- struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
- struct iscsi_transport *t = conn->transport; \
- \
- t->get_conn_param(conn, param, &value); \
- return snprintf(buf, 20, format"\n", value); \
- }
- #define iscsi_conn_int_attr(field, param, format) \
- iscsi_conn_int_attr_show(param, format) \
- static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL);
- iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u");
- iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u");
- iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d");
- iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d");
- iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d");
- iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d");
- #define iscsi_cdev_to_session(_cdev) \
- iscsi_dev_to_session(_cdev->dev)
- /*
- * iSCSI session attrs
- */
- #define iscsi_session_int_attr_show(param, format) \
- static ssize_t \
- show_session_int_param_##param(struct class_device *cdev, char *buf) \
- { \
- uint32_t value = 0; \
- struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
- struct iscsi_transport *t = session->transport; \
- \
- t->get_session_param(session, param, &value); \
- return snprintf(buf, 20, format"\n", value); \
- }
- #define iscsi_session_int_attr(field, param, format) \
- iscsi_session_int_attr_show(param, format) \
- static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL);
- iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d");
- iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu");
- iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d");
- iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u");
- iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u");
- iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d");
- iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d");
- iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d");
- #define SETUP_SESSION_RD_ATTR(field, param) \
- if (priv->param_mask & (1 << param)) { \
- priv->session_attrs[count] = &class_device_attr_##field;\
- count++; \
- }
- #define SETUP_CONN_RD_ATTR(field, param) \
- if (priv->param_mask & (1 << param)) { \
- priv->conn_attrs[count] = &class_device_attr_##field; \
- count++; \
- }
- static int iscsi_session_match(struct attribute_container *cont,
- struct device *dev)
- {
- struct iscsi_cls_session *session;
- struct Scsi_Host *shost;
- struct iscsi_internal *priv;
- if (!iscsi_is_session_dev(dev))
- return 0;
- session = iscsi_dev_to_session(dev);
- shost = iscsi_session_to_shost(session);
- if (!shost->transportt)
- return 0;
- priv = to_iscsi_internal(shost->transportt);
- if (priv->session_cont.ac.class != &iscsi_session_class.class)
- return 0;
- return &priv->session_cont.ac == cont;
- }
- static int iscsi_conn_match(struct attribute_container *cont,
- struct device *dev)
- {
- struct iscsi_cls_session *session;
- struct iscsi_cls_conn *conn;
- struct Scsi_Host *shost;
- struct iscsi_internal *priv;
- if (!iscsi_is_conn_dev(dev))
- return 0;
- conn = iscsi_dev_to_conn(dev);
- session = iscsi_dev_to_session(conn->dev.parent);
- shost = iscsi_session_to_shost(session);
- if (!shost->transportt)
- return 0;
- priv = to_iscsi_internal(shost->transportt);
- if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
- return 0;
- return &priv->conn_cont.ac == cont;
- }
- struct scsi_transport_template *
- iscsi_register_transport(struct iscsi_transport *tt)
- {
- struct iscsi_internal *priv;
- unsigned long flags;
- int count = 0, err;
- BUG_ON(!tt);
- priv = iscsi_if_transport_lookup(tt);
- if (priv)
- return NULL;
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return NULL;
- INIT_LIST_HEAD(&priv->list);
- priv->iscsi_transport = tt;
- priv->cdev.class = &iscsi_transport_class;
- snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
- err = class_device_register(&priv->cdev);
- if (err)
- goto free_priv;
- err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
- if (err)
- goto unregister_cdev;
- /* setup parameters mask */
- priv->param_mask = 0xFFFFFFFF;
- if (!(tt->caps & CAP_MULTI_R2T))
- priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T);
- if (!(tt->caps & CAP_HDRDGST))
- priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN);
- if (!(tt->caps & CAP_DATADGST))
- priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN);
- if (!(tt->caps & CAP_MARKERS)) {
- priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN);
- priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN);
- }
- /* connection parameters */
- priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
- priv->conn_cont.ac.class = &iscsi_connection_class.class;
- priv->conn_cont.ac.match = iscsi_conn_match;
- transport_container_register(&priv->conn_cont);
- SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
- SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
- SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN);
- SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN);
- SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN);
- SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN);
- BUG_ON(count > ISCSI_CONN_ATTRS);
- priv->conn_attrs[count] = NULL;
- count = 0;
- /* session parameters */
- priv->session_cont.ac.attrs = &priv->session_attrs[0];
- priv->session_cont.ac.class = &iscsi_session_class.class;
- priv->session_cont.ac.match = iscsi_session_match;
- transport_container_register(&priv->session_cont);
- SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN);
- SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T);
- SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN);
- SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST);
- SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST);
- SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN);
- SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN)
- SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL);
- BUG_ON(count > ISCSI_SESSION_ATTRS);
- priv->session_attrs[count] = NULL;
- spin_lock_irqsave(&iscsi_transport_lock, flags);
- list_add(&priv->list, &iscsi_transports);
- spin_unlock_irqrestore(&iscsi_transport_lock, flags);
- printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
- return &priv->t;
- unregister_cdev:
- class_device_unregister(&priv->cdev);
- free_priv:
- kfree(priv);
- return NULL;
- }
- EXPORT_SYMBOL_GPL(iscsi_register_transport);
- int iscsi_unregister_transport(struct iscsi_transport *tt)
- {
- struct iscsi_internal *priv;
- unsigned long flags;
- BUG_ON(!tt);
- mutex_lock(&rx_queue_mutex);
- priv = iscsi_if_transport_lookup(tt);
- BUG_ON (!priv);
- spin_lock_irqsave(&iscsi_transport_lock, flags);
- list_del(&priv->list);
- spin_unlock_irqrestore(&iscsi_transport_lock, flags);
- transport_container_unregister(&priv->conn_cont);
- transport_container_unregister(&priv->session_cont);
- sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
- class_device_unregister(&priv->cdev);
- mutex_unlock(&rx_queue_mutex);
- return 0;
- }
- EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
- static int
- iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr)
- {
- struct netlink_notify *n = ptr;
- if (event == NETLINK_URELEASE &&
- n->protocol == NETLINK_ISCSI && n->pid) {
- struct iscsi_cls_conn *conn;
- unsigned long flags;
- mempool_zone_complete(z_reply);
- spin_lock_irqsave(&connlock, flags);
- list_for_each_entry(conn, &connlist, conn_list) {
- mempool_zone_complete(conn->z_error);
- mempool_zone_complete(conn->z_pdu);
- }
- spin_unlock_irqrestore(&connlock, flags);
- }
- return NOTIFY_DONE;
- }
- static struct notifier_block iscsi_nl_notifier = {
- .notifier_call = iscsi_rcv_nl_event,
- };
- static __init int iscsi_transport_init(void)
- {
- int err;
- err = class_register(&iscsi_transport_class);
- if (err)
- return err;
- err = transport_class_register(&iscsi_connection_class);
- if (err)
- goto unregister_transport_class;
- err = transport_class_register(&iscsi_session_class);
- if (err)
- goto unregister_conn_class;
- err = netlink_register_notifier(&iscsi_nl_notifier);
- if (err)
- goto unregister_session_class;
- nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
- THIS_MODULE);
- if (!nls) {
- err = -ENOBUFS;
- goto unregister_notifier;
- }
- z_reply = mempool_zone_init(Z_MAX_REPLY,
- NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
- if (z_reply)
- return 0;
- sock_release(nls->sk_socket);
- unregister_notifier:
- netlink_unregister_notifier(&iscsi_nl_notifier);
- unregister_session_class:
- transport_class_unregister(&iscsi_session_class);
- unregister_conn_class:
- transport_class_unregister(&iscsi_connection_class);
- unregister_transport_class:
- class_unregister(&iscsi_transport_class);
- return err;
- }
- static void __exit iscsi_transport_exit(void)
- {
- mempool_zone_destroy(z_reply);
- sock_release(nls->sk_socket);
- netlink_unregister_notifier(&iscsi_nl_notifier);
- transport_class_unregister(&iscsi_connection_class);
- transport_class_unregister(&iscsi_session_class);
- class_unregister(&iscsi_transport_class);
- }
- module_init(iscsi_transport_init);
- module_exit(iscsi_transport_exit);
- MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
- "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
- "Alex Aizman <itn780@yahoo.com>");
- MODULE_DESCRIPTION("iSCSI Transport Interface");
- MODULE_LICENSE("GPL");
|