/* * 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 #include #include #include #include #include #include #include #include #include #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 , " "Dmitry Yusupov , " "Alex Aizman "); MODULE_DESCRIPTION("iSCSI Transport Interface"); MODULE_LICENSE("GPL");