* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/slab.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>
* List of sessions for this transport
*/
struct list_head sessions;
- /*
- * lock to serialize access to the sessions list which must
- * be taken after the rx_queue_mutex
- */
- spinlock_t session_lock;
/*
* based on transport capabilities, at register time we set these
* bits to tell the transport class it wants attributes displayed
spinlock_t freelock;
};
-static struct mempool_zone z_reply;
+static struct mempool_zone *z_reply;
/*
* Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time
#define Z_MAX_ERROR 16
#define Z_HIWAT_ERROR 12
-struct iscsi_if_conn {
- struct list_head conn_list; /* item in connlist */
- struct list_head session_list; /* item in session->connections */
- iscsi_connh_t connh;
- int active; /* must be accessed with the connlock */
- struct Scsi_Host *host; /* originated shost */
- struct device dev; /* sysfs transport/container device */
- struct iscsi_transport *transport;
- struct mempool_zone z_error;
- struct mempool_zone z_pdu;
- struct list_head freequeue;
-};
+static LIST_HEAD(connlist);
+static DEFINE_SPINLOCK(connlock);
-#define iscsi_dev_to_if_conn(_dev) \
- container_of(_dev, struct iscsi_if_conn, dev)
+/*
+ * 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;
-#define iscsi_cdev_to_if_conn(_cdev) \
- iscsi_dev_to_if_conn(_cdev->dev)
+ shost = iscsi_session_to_shost(session);
+ scsi_host_put(shost);
+ kfree(session);
+ module_put(transport->owner);
+}
-static LIST_HEAD(connlist);
-static DEFINE_SPINLOCK(connlock);
+static int iscsi_is_session_dev(const struct device *dev)
+{
+ return dev->release == iscsi_session_release;
+}
-struct iscsi_if_session {
- struct list_head list; /* item in session_list */
- struct list_head connections;
- iscsi_sessionh_t sessionh;
- struct iscsi_transport *transport;
- struct device dev; /* sysfs transport/container device */
-};
+/**
+ * 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;
+
+ 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;
+
+ if (scsi_add_host(shost, NULL))
+ goto free_host;
+
+ session = iscsi_create_session(shost, transport);
+ if (!session)
+ goto remove_host;
-#define iscsi_dev_to_if_session(_dev) \
- container_of(_dev, struct iscsi_if_session, dev)
+ *(unsigned long*)shost->hostdata = (unsigned long)session;
+ return shost;
+
+remove_host:
+ scsi_remove_host(shost);
+free_host:
+ scsi_host_put(shost);
+ return NULL;
+}
-#define iscsi_cdev_to_if_session(_cdev) \
- iscsi_dev_to_if_session(_cdev->dev)
+EXPORT_SYMBOL_GPL(iscsi_transport_create_session);
-#define iscsi_if_session_to_shost(_session) \
- dev_to_shost(_session->dev.parent)
+/**
+ * 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;
-static struct iscsi_if_conn*
+ scsi_remove_host(shost);
+ session = hostdata_session(shost->hostdata);
+ 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_cls_conn*
iscsi_if_find_conn(uint64_t key)
{
unsigned long flags;
- struct iscsi_if_conn *conn;
+ struct iscsi_cls_conn *conn;
spin_lock_irqsave(&connlock, flags);
list_for_each_entry(conn, &connlist, conn_list)
}
static void*
-mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data)
+mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data)
{
struct mempool_zone *zone = pool_data;
spin_unlock_irqrestore(&zone->freelock, flags);
}
-static int
-mempool_zone_init(struct mempool_zone *zp, unsigned max, unsigned size,
- unsigned hiwat)
+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->pool = mempool_create(max, mempool_zone_alloc_skb,
mempool_zone_free_skb, zp);
- if (!zp->pool)
- return -ENOMEM;
+ if (!zp->pool) {
+ kfree(zp);
+ return NULL;
+ }
zp->size = size;
zp->hiwat = hiwat;
spin_lock_init(&zp->freelock);
atomic_set(&zp->allocated, 0);
- return 0;
+ 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 nlmsghdr *nlh;
struct sk_buff *skb;
struct iscsi_uevent *ev;
- struct iscsi_if_conn *conn;
+ struct iscsi_cls_conn *conn;
char *pdu;
int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
data_size);
conn = iscsi_if_find_conn(connh);
BUG_ON(!conn);
- mempool_zone_complete(&conn->z_pdu);
+ mempool_zone_complete(conn->z_pdu);
- skb = mempool_zone_get_skb(&conn->z_pdu);
+ skb = mempool_zone_get_skb(conn->z_pdu);
if (!skb) {
iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED);
- printk(KERN_ERR "iscsi%d: can not deliver control PDU: OOM\n",
- conn->host->host_no);
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver "
+ "control PDU: OOM\n");
return -ENOMEM;
}
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)
+ if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat)
ev->iferror = -ENOMEM;
ev->r.recv_req.conn_handle = connh;
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);
+ return iscsi_unicast_skb(conn->z_pdu, skb);
}
EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
struct nlmsghdr *nlh;
struct sk_buff *skb;
struct iscsi_uevent *ev;
- struct iscsi_if_conn *conn;
+ struct iscsi_cls_conn *conn;
int len = NLMSG_SPACE(sizeof(*ev));
conn = iscsi_if_find_conn(connh);
BUG_ON(!conn);
- mempool_zone_complete(&conn->z_error);
+ mempool_zone_complete(conn->z_error);
- skb = mempool_zone_get_skb(&conn->z_error);
+ skb = mempool_zone_get_skb(conn->z_error);
if (!skb) {
- printk(KERN_ERR "iscsi%d: gracefully ignored conn error (%d)\n",
- conn->host->host_no, error);
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored "
+ "conn error (%d)\n", error);
return;
}
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)
+ if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat)
ev->iferror = -ENOMEM;
ev->r.connerror.error = error;
ev->r.connerror.conn_handle = connh;
- iscsi_unicast_skb(&conn->z_error, skb);
+ iscsi_unicast_skb(conn->z_error, skb);
- printk(KERN_INFO "iscsi%d: detected conn error (%d)\n",
- conn->host->host_no, error);
+ dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n",
+ error);
}
EXPORT_SYMBOL_GPL(iscsi_conn_error);
int flags = multi ? NLM_F_MULTI : 0;
int t = done ? NLMSG_DONE : type;
- mempool_zone_complete(&z_reply);
+ mempool_zone_complete(z_reply);
- skb = mempool_zone_get_skb(&z_reply);
+ skb = mempool_zone_get_skb(z_reply);
/*
* FIXME:
* user is supposed to react on iferror == -ENOMEM;
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);
+ return iscsi_unicast_skb(z_reply, skb);
}
-/*
- * iSCSI Session's hostdata organization:
- *
- * *------------------* <== host->hostdata
- * | transport |
- * |------------------| <== iscsi_hostdata(host->hostdata)
- * | transport's data |
- * |------------------| <== hostdata_session(host->hostdata)
- * | interface's data |
- * *------------------*
- */
+static int
+iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb,
+ 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;
-#define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \
- _t->hostdata_size % sizeof(unsigned long) + \
- sizeof(struct iscsi_if_session))
+ conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle);
+ if (!conn)
+ return -EEXIST;
-#define hostdata_session(_hostdata) ((void*)_hostdata + sizeof(unsigned long) + \
- ((struct iscsi_transport *) \
- iscsi_ptr(*(uint64_t *)_hostdata))->hostdata_size)
+ do {
+ int actual_size;
-static void iscsi_if_session_dev_release(struct device *dev)
-{
- struct iscsi_if_session *session = iscsi_dev_to_if_session(dev);
- struct iscsi_transport *transport = session->transport;
- struct Scsi_Host *shost = iscsi_if_session_to_shost(session);
- struct iscsi_if_conn *conn, *tmp;
- unsigned long flags;
+ mempool_zone_complete(conn->z_pdu);
- /* now free connections */
- spin_lock_irqsave(&connlock, flags);
- list_for_each_entry_safe(conn, tmp, &session->connections,
- session_list) {
- list_del(&conn->session_list);
- mempool_destroy(conn->z_pdu.pool);
- mempool_destroy(conn->z_error.pool);
- kfree(conn);
- }
- spin_unlock_irqrestore(&connlock, flags);
- scsi_host_put(shost);
- module_put(transport->owner);
+ 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(ev->u.get_stats.conn_handle, 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(skb, 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_if_session *session;
struct Scsi_Host *shost;
- unsigned long flags;
- int error;
-
- if (!try_module_get(transport->owner))
- return -EPERM;
- shost = scsi_host_alloc(transport->host_template,
- hostdata_privsize(transport));
- if (!shost) {
- ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
- printk(KERN_ERR "iscsi: can not allocate SCSI host for "
- "session\n");
- error = -ENOMEM;
- goto out_module_put;
- }
- shost->max_id = 1;
- shost->max_channel = 0;
- shost->max_lun = transport->max_lun;
- shost->max_cmd_len = transport->max_cmd_len;
- shost->transportt = &priv->t;
-
- /* store struct iscsi_transport in hostdata */
- *(uint64_t*)shost->hostdata = ev->transport_handle;
+ if (!transport->create_session)
+ return -EINVAL;
- ev->r.c_session_ret.session_handle = transport->create_session(
- ev->u.c_session.initial_cmdsn, shost);
- if (ev->r.c_session_ret.session_handle == iscsi_handle(NULL)) {
- error = 0;
- goto out_host_put;
- }
+ shost = transport->create_session(&priv->t,
+ ev->u.c_session.initial_cmdsn);
+ if (!shost)
+ return -ENOMEM;
- /* host_no becomes assigned SID */
+ ev->r.c_session_ret.session_handle = iscsi_handle(iscsi_hostdata(shost->hostdata));
ev->r.c_session_ret.sid = shost->host_no;
- /* initialize session */
- session = hostdata_session(shost->hostdata);
- INIT_LIST_HEAD(&session->connections);
- INIT_LIST_HEAD(&session->list);
- session->sessionh = ev->r.c_session_ret.session_handle;
- session->transport = transport;
-
- error = scsi_add_host(shost, NULL);
- if (error)
- goto out_destroy_session;
-
- /*
- * 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_if_session_dev_release;
- error = device_register(&session->dev);
- if (error) {
- printk(KERN_ERR "iscsi: could not register session%d's dev\n",
- shost->host_no);
- goto out_remove_host;
- }
- transport_register_device(&session->dev);
-
- /* add this session to the list of active sessions */
- spin_lock_irqsave(&priv->session_lock, flags);
- list_add(&session->list, &priv->sessions);
- spin_unlock_irqrestore(&priv->session_lock, flags);
-
return 0;
-
-out_remove_host:
- scsi_remove_host(shost);
-out_destroy_session:
- transport->destroy_session(ev->r.c_session_ret.session_handle);
- ev->r.c_session_ret.session_handle = iscsi_handle(NULL);
-out_host_put:
- scsi_host_put(shost);
-out_module_put:
- module_put(transport->owner);
- return error;
}
static int
iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
{
struct iscsi_transport *transport = priv->iscsi_transport;
+
struct Scsi_Host *shost;
- struct iscsi_if_session *session;
- unsigned long flags;
- struct iscsi_if_conn *conn;
- int error = 0;
+
+ if (!transport->destroy_session)
+ return -EINVAL;
shost = scsi_host_lookup(ev->u.d_session.sid);
if (shost == ERR_PTR(-ENXIO))
return -EEXIST;
- session = hostdata_session(shost->hostdata);
- /* check if we have active connections */
- spin_lock_irqsave(&connlock, flags);
- list_for_each_entry(conn, &session->connections, session_list) {
- if (conn->active) {
- printk(KERN_ERR "iscsi%d: can not destroy session: "
- "has active connection (%p)\n",
- shost->host_no, iscsi_ptr(conn->connh));
- spin_unlock_irqrestore(&connlock, flags);
- error = EIO;
- goto out_release_ref;
- }
- }
- spin_unlock_irqrestore(&connlock, flags);
-
- scsi_remove_host(shost);
- transport->destroy_session(ev->u.d_session.session_handle);
- transport_unregister_device(&session->dev);
- device_unregister(&session->dev);
-
- /* remove this session from the list of active sessions */
- spin_lock_irqsave(&priv->session_lock, flags);
- list_del(&session->list);
- spin_unlock_irqrestore(&priv->session_lock, flags);
-
- /* ref from host alloc */
- scsi_host_put(shost);
-out_release_ref:
- /* ref from host lookup */
- scsi_host_put(shost);
- return error;
-}
-
-static void iscsi_if_conn_dev_release(struct device *dev)
-{
- struct iscsi_if_conn *conn = iscsi_dev_to_if_conn(dev);
- struct Scsi_Host *shost = conn->host;
-
- scsi_host_put(shost);
+ if (transport->destroy_session)
+ transport->destroy_session(shost);
+ /* ref from host lookup */
+ scsi_host_put(shost);
+ return 0;
}
static int
-iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
-{
- struct iscsi_if_session *session;
+iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev){
struct Scsi_Host *shost;
- struct iscsi_if_conn *conn;
+ struct iscsi_cls_conn *conn;
unsigned long flags;
- int error;
+
+ if (!transport->create_conn)
+ return -EINVAL;
shost = scsi_host_lookup(ev->u.c_conn.sid);
if (shost == ERR_PTR(-ENXIO))
return -EEXIST;
- session = hostdata_session(shost->hostdata);
- conn = kmalloc(sizeof(struct iscsi_if_conn), GFP_KERNEL);
- if (!conn) {
- error = -ENOMEM;
- goto out_release_ref;
- }
- memset(conn, 0, sizeof(struct iscsi_if_conn));
- INIT_LIST_HEAD(&conn->session_list);
- INIT_LIST_HEAD(&conn->conn_list);
- conn->host = shost;
- conn->transport = transport;
+ conn = transport->create_conn(shost, ev->u.c_conn.cid);
+ if (!conn)
+ goto release_ref;
- error = mempool_zone_init(&conn->z_pdu, Z_MAX_PDU,
+ 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 (error) {
- printk(KERN_ERR "iscsi%d: can not allocate pdu zone for new "
- "conn\n", shost->host_no);
- goto out_free_conn;
+ if (!conn->z_pdu) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
+ "pdu zone for new conn\n");
+ goto destroy_conn;
}
- error = mempool_zone_init(&conn->z_error, Z_MAX_ERROR,
+
+ conn->z_error = mempool_zone_init(Z_MAX_ERROR,
NLMSG_SPACE(sizeof(struct iscsi_uevent)),
Z_HIWAT_ERROR);
- if (error) {
- printk(KERN_ERR "iscsi%d: can not allocate error zone for "
- "new conn\n", shost->host_no);
- goto out_free_pdu_pool;
- }
-
- ev->r.handle = transport->create_conn(ev->u.c_conn.session_handle,
- ev->u.c_conn.cid);
- if (!ev->r.handle) {
- error = -ENODEV;
- goto out_free_error_pool;
+ if (!conn->z_error) {
+ dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate "
+ "error zone for new conn\n");
+ goto free_pdu_pool;
}
- conn->connh = ev->r.handle;
-
- /*
- * this is released in the dev's release function
- */
- if (!scsi_host_get(shost))
- goto out_destroy_conn;
- snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
- shost->host_no, ev->u.c_conn.cid);
- conn->dev.parent = &session->dev;
- conn->dev.release = iscsi_if_conn_dev_release;
- error = device_register(&conn->dev);
- if (error) {
- printk(KERN_ERR "iscsi%d: could not register connections%u "
- "dev\n", shost->host_no, ev->u.c_conn.cid);
- goto out_release_parent_ref;
- }
- transport_register_device(&conn->dev);
+ ev->r.handle = conn->connh = iscsi_handle(conn->dd_data);
spin_lock_irqsave(&connlock, flags);
list_add(&conn->conn_list, &connlist);
- list_add(&conn->session_list, &session->connections);
conn->active = 1;
spin_unlock_irqrestore(&connlock, flags);
scsi_host_put(shost);
return 0;
-out_release_parent_ref:
+free_pdu_pool:
+ mempool_zone_destroy(conn->z_pdu);
+destroy_conn:
+ if (transport->destroy_conn)
+ transport->destroy_conn(conn->dd_data);
+release_ref:
scsi_host_put(shost);
-out_destroy_conn:
- transport->destroy_conn(ev->r.handle);
-out_free_error_pool:
- mempool_destroy(conn->z_error.pool);
-out_free_pdu_pool:
- mempool_destroy(conn->z_pdu.pool);
-out_free_conn:
- kfree(conn);
-out_release_ref:
- scsi_host_put(shost);
- return error;
+ return -ENOMEM;
}
static int
iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
{
unsigned long flags;
- struct iscsi_if_conn *conn;
+ struct iscsi_cls_conn *conn;
+ struct mempool_zone *z_error, *z_pdu;
conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle);
if (!conn)
return -EEXIST;
- transport->destroy_conn(ev->u.d_conn.conn_handle);
+ if (!transport->destroy_conn)
+ return -EINVAL;
spin_lock_irqsave(&connlock, flags);
conn->active = 0;
list_del(&conn->conn_list);
spin_unlock_irqrestore(&connlock, flags);
- transport_unregister_device(&conn->dev);
- device_unregister(&conn->dev);
- return 0;
-}
-
-static int
-iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb,
- struct nlmsghdr *nlh)
-{
- struct iscsi_uevent *ev = NLMSG_DATA(nlh);
- struct iscsi_stats *stats;
- struct sk_buff *skbstat;
- struct iscsi_if_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_if_find_conn(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) {
- printk(KERN_ERR "iscsi%d: can not deliver stats: OOM\n",
- conn->host->host_no);
- 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));
+ z_pdu = conn->z_pdu;
+ z_error = conn->z_error;
- transport->get_stats(ev->u.get_stats.conn_handle, 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(skb, NLMSG_ALIGN(actual_size));
- nlhstat->nlmsg_len = actual_size;
+ if (transport->destroy_conn)
+ transport->destroy_conn(conn);
- err = iscsi_unicast_skb(&conn->z_pdu, skbstat);
- } while (err < 0 && err != -ECONNREFUSED);
+ mempool_zone_destroy(z_pdu);
+ mempool_zone_destroy(z_error);
- return err;
+ return 0;
}
static int
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)
+ if (atomic_read(&z_reply->allocated) >=
+ z_reply->hiwat)
ev->iferror = -ENOMEM;
} while (err < 0 && err != -ECONNREFUSED);
skb_pull(skb, rlen);
mutex_unlock(&rx_queue_mutex);
}
+#define iscsi_cdev_to_conn(_cdev) \
+ iscsi_dev_to_conn(_cdev->dev)
+
/*
* iSCSI connection attrs
*/
show_conn_int_param_##param(struct class_device *cdev, char *buf) \
{ \
uint32_t value = 0; \
- struct iscsi_if_conn *conn = iscsi_cdev_to_if_conn(cdev); \
- struct iscsi_internal *priv; \
+ struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \
+ struct iscsi_transport *t = conn->transport; \
\
- priv = to_iscsi_internal(conn->host->transportt); \
- if (priv->param_mask & (1 << param)) \
- priv->iscsi_transport->get_param(conn->connh, param, &value); \
+ t->get_conn_param(conn->dd_data, param, &value); \
return snprintf(buf, 20, format"\n", value); \
}
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
*/
show_session_int_param_##param(struct class_device *cdev, char *buf) \
{ \
uint32_t value = 0; \
- struct iscsi_if_session *session = iscsi_cdev_to_if_session(cdev); \
- struct Scsi_Host *shost = iscsi_if_session_to_shost(session); \
- struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
- struct iscsi_if_conn *conn = NULL; \
- unsigned long flags; \
- \
- spin_lock_irqsave(&connlock, flags); \
- if (!list_empty(&session->connections)) \
- conn = list_entry(session->connections.next, \
- struct iscsi_if_conn, session_list); \
- spin_unlock_irqrestore(&connlock, flags); \
+ struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
+ struct Scsi_Host *shost = iscsi_session_to_shost(session); \
+ struct iscsi_transport *t = session->transport; \
\
- if (conn && (priv->param_mask & (1 << param))) \
- priv->iscsi_transport->get_param(conn->connh, param, &value);\
+ t->get_session_param(shost, param, &value); \
return snprintf(buf, 20, format"\n", value); \
}
count++; \
}
-static int iscsi_is_session_dev(const struct device *dev)
-{
- return dev->release == iscsi_if_session_dev_release;
-}
-
static int iscsi_session_match(struct attribute_container *cont,
struct device *dev)
{
- struct iscsi_if_session *session;
+ 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_if_session(dev);
- shost = iscsi_if_session_to_shost(session);
+ session = iscsi_dev_to_session(dev);
+ shost = iscsi_session_to_shost(session);
if (!shost->transportt)
return 0;
return &priv->session_cont.ac == cont;
}
-static int iscsi_is_conn_dev(const struct device *dev)
-{
- return dev->release == iscsi_if_conn_dev_release;
-}
-
static int iscsi_conn_match(struct attribute_container *cont,
struct device *dev)
{
- struct iscsi_if_conn *conn;
+ 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_if_conn(dev);
- shost = conn->host;
+ 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;
return &priv->conn_cont.ac == cont;
}
-int iscsi_register_transport(struct iscsi_transport *tt)
+struct scsi_transport_template *
+iscsi_register_transport(struct iscsi_transport *tt)
{
struct iscsi_internal *priv;
unsigned long flags;
priv = iscsi_if_transport_lookup(tt);
if (priv)
- return -EEXIST;
+ return NULL;
priv = kmalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
- return -ENOMEM;
+ return NULL;
memset(priv, 0, sizeof(*priv));
INIT_LIST_HEAD(&priv->list);
INIT_LIST_HEAD(&priv->sessions);
- spin_lock_init(&priv->session_lock);
priv->iscsi_transport = tt;
priv->cdev.class = &iscsi_transport_class;
spin_unlock_irqrestore(&iscsi_transport_lock, flags);
printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
- return 0;
+ return &priv->t;
unregister_cdev:
class_device_unregister(&priv->cdev);
free_priv:
kfree(priv);
- return err;
+ return NULL;
}
EXPORT_SYMBOL_GPL(iscsi_register_transport);
priv = iscsi_if_transport_lookup(tt);
BUG_ON (!priv);
- spin_lock_irqsave(&priv->session_lock, flags);
- if (!list_empty(&priv->sessions)) {
- spin_unlock_irqrestore(&priv->session_lock, flags);
- mutex_unlock(&rx_queue_mutex);
- return -EPERM;
- }
- spin_unlock_irqrestore(&priv->session_lock, flags);
-
spin_lock_irqsave(&iscsi_transport_lock, flags);
list_del(&priv->list);
spin_unlock_irqrestore(&iscsi_transport_lock, flags);
if (event == NETLINK_URELEASE &&
n->protocol == NETLINK_ISCSI && n->pid) {
- struct iscsi_if_conn *conn;
+ struct iscsi_cls_conn *conn;
unsigned long flags;
- mempool_zone_complete(&z_reply);
+ 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);
+ mempool_zone_complete(conn->z_error);
+ mempool_zone_complete(conn->z_pdu);
}
spin_unlock_irqrestore(&connlock, flags);
}
goto unregister_session_class;
nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx,
- THIS_MODULE);
+ THIS_MODULE);
if (!nls) {
err = -ENOBUFS;
goto unregister_notifier;
}
- err = mempool_zone_init(&z_reply, Z_MAX_REPLY,
+ z_reply = mempool_zone_init(Z_MAX_REPLY,
NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY);
- if (!err)
+ if (z_reply)
return 0;
sock_release(nls->sk_socket);
static void __exit iscsi_transport_exit(void)
{
- mempool_destroy(z_reply.pool);
+ mempool_zone_destroy(z_reply);
sock_release(nls->sk_socket);
netlink_unregister_notifier(&iscsi_nl_notifier);
transport_class_unregister(&iscsi_connection_class);
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff