diff options
| -rw-r--r-- | drivers/scsi/scsi_transport_iscsi.c | 190 | ||||
| -rw-r--r-- | include/scsi/iscsi_if.h | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_transport_iscsi.h | 19 |
3 files changed, 172 insertions, 39 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index ac9d298..c3c07cc 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -33,6 +33,7 @@ #define ISCSI_SESSION_ATTRS 19 #define ISCSI_CONN_ATTRS 13 #define ISCSI_HOST_ATTRS 4 + #define ISCSI_TRANSPORT_VERSION "2.0-869" struct iscsi_internal { @@ -112,6 +113,123 @@ static struct attribute_group iscsi_transport_group = { .attrs = iscsi_transport_attrs, }; +/* + * iSCSI endpoint attrs + */ +#define iscsi_dev_to_endpoint(_dev) \ + container_of(_dev, struct iscsi_endpoint, dev) + +#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \ +struct device_attribute dev_attr_##_prefix##_##_name = \ + __ATTR(_name,_mode,_show,_store) + +static void iscsi_endpoint_release(struct device *dev) +{ + struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); + kfree(ep); +} + +static struct class iscsi_endpoint_class = { + .name = "iscsi_endpoint", + .dev_release = iscsi_endpoint_release, +}; + +static ssize_t +show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); + return sprintf(buf, "%u\n", ep->id); +} +static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL); + +static struct attribute *iscsi_endpoint_attrs[] = { + &dev_attr_ep_handle.attr, + NULL, +}; + +static struct attribute_group iscsi_endpoint_group = { + .attrs = iscsi_endpoint_attrs, +}; + +#define ISCSI_MAX_EPID -1 + +static int iscsi_match_epid(struct device *dev, void *data) +{ + struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); + unsigned int *epid = (unsigned int *) data; + + return *epid == ep->id; +} + +struct iscsi_endpoint * +iscsi_create_endpoint(int dd_size) +{ + struct device *dev; + struct iscsi_endpoint *ep; + unsigned int id; + int err; + + for (id = 1; id < ISCSI_MAX_EPID; id++) { + dev = class_find_device(&iscsi_endpoint_class, &id, + iscsi_match_epid); + if (!dev) + break; + } + if (id == ISCSI_MAX_EPID) { + printk(KERN_ERR "Too many connections. Max supported %u\n", + ISCSI_MAX_EPID - 1); + return NULL; + } + + ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL); + if (!ep) + return NULL; + + ep->id = id; + ep->dev.class = &iscsi_endpoint_class; + snprintf(ep->dev.bus_id, BUS_ID_SIZE, "ep-%u", id); + err = device_register(&ep->dev); + if (err) + goto free_ep; + + err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group); + if (err) + goto unregister_dev; + + if (dd_size) + ep->dd_data = &ep[1]; + return ep; + +unregister_dev: + device_unregister(&ep->dev); + return NULL; + +free_ep: + kfree(ep); + return NULL; +} +EXPORT_SYMBOL_GPL(iscsi_create_endpoint); + +void iscsi_destroy_endpoint(struct iscsi_endpoint *ep) +{ + sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group); + device_unregister(&ep->dev); +} +EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint); + +struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle) +{ + struct device *dev; + + dev = class_find_device(&iscsi_endpoint_class, &handle, + iscsi_match_epid); + if (!dev) + return NULL; + + return iscsi_dev_to_endpoint(dev); +} +EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint); + static int iscsi_setup_host(struct transport_container *tc, struct device *dev, struct device *cdev) { @@ -1094,33 +1212,16 @@ int iscsi_session_event(struct iscsi_cls_session *session, EXPORT_SYMBOL_GPL(iscsi_session_event); static int -iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev, - uint32_t host_no, uint32_t initial_cmdsn, +iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep, + struct iscsi_uevent *ev, uint32_t initial_cmdsn, uint16_t cmds_max, uint16_t queue_depth) { struct iscsi_transport *transport = priv->iscsi_transport; struct iscsi_cls_session *session; - struct Scsi_Host *shost = NULL; + uint32_t host_no; - /* - * Software iscsi allocates a host per session, but - * offload drivers (and possibly iser one day) allocate a host per - * hba/nic/rnic. Offload will match a host here, but software will - * return a new hostno after the create_session callback has returned. - */ - if (host_no != UINT_MAX) { - shost = scsi_host_lookup(host_no); - if (IS_ERR(shost)) { - printk(KERN_ERR "Could not find host no %u to " - "create session\n", host_no); - return -ENODEV; - } - } - - session = transport->create_session(shost, cmds_max, queue_depth, + session = transport->create_session(ep, cmds_max, queue_depth, initial_cmdsn, &host_no); - if (shost) - scsi_host_put(shost); if (!session) return -ENOMEM; @@ -1199,6 +1300,7 @@ static int iscsi_if_transport_ep(struct iscsi_transport *transport, struct iscsi_uevent *ev, int msg_type) { + struct iscsi_endpoint *ep; struct sockaddr *dst_addr; int rc = 0; @@ -1208,22 +1310,33 @@ iscsi_if_transport_ep(struct iscsi_transport *transport, return -EINVAL; dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); - rc = transport->ep_connect(dst_addr, - ev->u.ep_connect.non_blocking, - &ev->r.ep_connect_ret.handle); + ep = transport->ep_connect(dst_addr, + ev->u.ep_connect.non_blocking); + if (IS_ERR(ep)) + return PTR_ERR(ep); + + ev->r.ep_connect_ret.handle = ep->id; break; case ISCSI_UEVENT_TRANSPORT_EP_POLL: if (!transport->ep_poll) return -EINVAL; - ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, + ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle); + if (!ep) + return -EINVAL; + + ev->r.retcode = transport->ep_poll(ep, ev->u.ep_poll.timeout_ms); break; case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: if (!transport->ep_disconnect) return -EINVAL; - transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); + ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle); + if (!ep) + return -EINVAL; + + transport->ep_disconnect(ep); break; } return rc; @@ -1283,12 +1396,12 @@ static int iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { int err = 0; - uint32_t host_no = UINT_MAX; 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; + struct iscsi_endpoint *ep = NULL; priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); if (!priv) @@ -1302,14 +1415,17 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) switch (nlh->nlmsg_type) { case ISCSI_UEVENT_CREATE_SESSION: - err = iscsi_if_create_session(priv, ev, host_no, + err = iscsi_if_create_session(priv, ep, ev, ev->u.c_session.initial_cmdsn, ev->u.c_session.cmds_max, ev->u.c_session.queue_depth); break; case ISCSI_UEVENT_CREATE_BOUND_SESSION: - err = iscsi_if_create_session(priv, ev, - ev->u.c_bound_session.host_no, + ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle); + if (!ep) + return -EINVAL; + + err = iscsi_if_create_session(priv, ep, ev, ev->u.c_bound_session.initial_cmdsn, ev->u.c_bound_session.cmds_max, ev->u.c_bound_session.queue_depth); @@ -1774,6 +1890,7 @@ iscsi_register_transport(struct iscsi_transport *tt) unregister_dev: device_unregister(&priv->dev); + return NULL; free_priv: kfree(priv); return NULL; @@ -1821,10 +1938,14 @@ static __init int iscsi_transport_init(void) if (err) return err; - err = transport_class_register(&iscsi_host_class); + err = class_register(&iscsi_endpoint_class); if (err) goto unregister_transport_class; + err = transport_class_register(&iscsi_host_class); + if (err) + goto unregister_endpoint_class; + err = transport_class_register(&iscsi_connection_class); if (err) goto unregister_host_class; @@ -1833,8 +1954,8 @@ static __init int iscsi_transport_init(void) if (err) goto unregister_conn_class; - nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL, - THIS_MODULE); + nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, + NULL, THIS_MODULE); if (!nls) { err = -ENOBUFS; goto unregister_session_class; @@ -1854,6 +1975,8 @@ unregister_conn_class: transport_class_unregister(&iscsi_connection_class); unregister_host_class: transport_class_unregister(&iscsi_host_class); +unregister_endpoint_class: + class_unregister(&iscsi_endpoint_class); unregister_transport_class: class_unregister(&iscsi_transport_class); return err; @@ -1866,6 +1989,7 @@ static void __exit iscsi_transport_exit(void) transport_class_unregister(&iscsi_connection_class); transport_class_unregister(&iscsi_session_class); transport_class_unregister(&iscsi_host_class); + class_unregister(&iscsi_endpoint_class); class_unregister(&iscsi_transport_class); } diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h index 801a677..a0f13a2 100644 --- a/include/scsi/iscsi_if.h +++ b/include/scsi/iscsi_if.h @@ -80,7 +80,7 @@ struct iscsi_uevent { uint16_t queue_depth; } c_session; struct msg_create_bound_session { - uint32_t host_no; + uint64_t ep_handle; uint32_t initial_cmdsn; uint16_t cmds_max; uint16_t queue_depth; diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h index d6b8231..f5444e0 100644 --- a/include/scsi/scsi_transport_iscsi.h +++ b/include/scsi/scsi_transport_iscsi.h @@ -30,6 +30,7 @@ struct scsi_transport_template; struct iscsi_transport; +struct iscsi_endpoint; struct Scsi_Host; struct iscsi_cls_conn; struct iscsi_conn; @@ -85,7 +86,7 @@ struct iscsi_transport { /* LLD sets this to indicate what values it can export to sysfs */ uint64_t param_mask; uint64_t host_param_mask; - struct iscsi_cls_session *(*create_session) (struct Scsi_Host *shost, + struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, uint16_t cmds_max, uint16_t qdepth, uint32_t sn, uint32_t *hn); void (*destroy_session) (struct iscsi_cls_session *session); @@ -117,10 +118,10 @@ struct iscsi_transport { void (*cleanup_task) (struct iscsi_conn *conn, struct iscsi_task *task); void (*session_recovery_timedout) (struct iscsi_cls_session *session); - int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking, - uint64_t *ep_handle); - int (*ep_poll) (uint64_t ep_handle, int timeout_ms); - void (*ep_disconnect) (uint64_t ep_handle); + struct iscsi_endpoint *(*ep_connect) (struct sockaddr *dst_addr, + int non_blocking); + int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); + void (*ep_disconnect) (struct iscsi_endpoint *ep); int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, uint32_t enable, struct sockaddr *dst_addr); }; @@ -203,6 +204,11 @@ struct iscsi_cls_host { extern void iscsi_host_for_each_session(struct Scsi_Host *shost, void (*fn)(struct iscsi_cls_session *)); +struct iscsi_endpoint { + void *dd_data; /* LLD private data */ + struct device dev; + unsigned int id; +}; /* * session and connection functions that can be used by HW iSCSI LLDs @@ -233,5 +239,8 @@ extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); extern void iscsi_unblock_session(struct iscsi_cls_session *session); extern void iscsi_block_session(struct iscsi_cls_session *session); extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); +extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); +extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); +extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); #endif |
