iscsi-target: Add iscsit_transport API template

Add basic struct iscsit_transport API template to allow iscsi-target for
running with external transport modules using existing iscsi_target_core.h
code.

For all external modules, this calls try_module_get() and module_put()
to obtain + release an external iscsit_transport module reference count.

Also include the iscsi-target symbols necessary in iscsi_transport.h to
allow external transport modules to function.

v3 changes:
- Add iscsit_build_reject export for ISTATE_SEND_REJECT usage

v2 changes:

- Drop unnecessary export of iscsit_get_transport + iscsit_put_transport (roland)
- Add ->iscsit_queue_data_in() to remove extra context switch on RDMA_WRITE
- Add ->iscsit_queue_status() to remove extra context switch on IB_SEND status
- Add ->iscsit_get_dataout() to remove extra context switch on RDMA_READ
- Drop ->iscsit_free_cmd()
- Drop ->iscsit_unmap_cmd()
- Rename iscsit_create_transport() -> iscsit_register_transport() (andy)
- Rename iscsit_destroy_transport() -> iscsit_unregister_transport() (andy)

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/Makefile b/drivers/target/iscsi/Makefile
index 5b9a2cf..13a9240 100644 (file)
--- a/drivers/target/iscsi/Makefile
+++ b/drivers/target/iscsi/Makefile
@@ -15,6 +15,7 @@ iscsi_target_mod-y +=         iscsi_target_parameters.o \
                                iscsi_target_util.o \
                                iscsi_target.o \
                                iscsi_target_configfs.o \
-                               iscsi_target_stat.o
+                               iscsi_target_stat.o \
+                               iscsi_target_transport.o
 
 obj-$(CONFIG_ISCSI_TARGET)     += iscsi_target_mod.o

diff --git a/drivers/target/iscsi/iscsi_target_transport.c b/drivers/target/iscsi/iscsi_target_transport.c
new file mode 100644 (file)
index 0000000..882728f
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target_transport.c
@@ -0,0 +1,55 @@
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <target/iscsi/iscsi_transport.h>
+
+static LIST_HEAD(g_transport_list);
+static DEFINE_MUTEX(transport_mutex);
+
+struct iscsit_transport *iscsit_get_transport(int type)
+{
+       struct iscsit_transport *t;
+
+       mutex_lock(&transport_mutex);
+       list_for_each_entry(t, &g_transport_list, t_node) {
+               if (t->transport_type == type) {
+                       if (t->owner && !try_module_get(t->owner)) {
+                               t = NULL;
+                       }
+                       mutex_unlock(&transport_mutex);
+                       return t;
+               }
+       }
+       mutex_unlock(&transport_mutex);
+
+       return NULL;
+}
+
+void iscsit_put_transport(struct iscsit_transport *t)
+{
+       if (t->owner)
+               module_put(t->owner);
+}
+
+int iscsit_register_transport(struct iscsit_transport *t)
+{
+       INIT_LIST_HEAD(&t->t_node);
+
+       mutex_lock(&transport_mutex);
+       list_add_tail(&t->t_node, &g_transport_list);
+       mutex_unlock(&transport_mutex);
+
+       pr_debug("Registered iSCSI transport: %s\n", t->name);
+
+       return 0;
+}
+EXPORT_SYMBOL(iscsit_register_transport);
+
+void iscsit_unregister_transport(struct iscsit_transport *t)
+{
+       mutex_lock(&transport_mutex);
+       list_del(&t->t_node);
+       mutex_unlock(&transport_mutex);
+
+       pr_debug("Unregistered iSCSI transport: %s\n", t->name);
+}
+EXPORT_SYMBOL(iscsit_unregister_transport);

diff --git a/include/target/iscsi/iscsi_transport.h b/include/target/iscsi/iscsi_transport.h
new file mode 100644 (file)
index 0000000..23a87d0
--- /dev/null
+++ b/include/target/iscsi/iscsi_transport.h
@@ -0,0 +1,83 @@
+#include <linux/module.h>
+#include <linux/list.h>
+#include "../../../drivers/target/iscsi/iscsi_target_core.h"
+
+struct iscsit_transport {
+#define ISCSIT_TRANSPORT_NAME  16
+       char name[ISCSIT_TRANSPORT_NAME];
+       int transport_type;
+       struct module *owner;
+       struct list_head t_node;
+       int (*iscsit_setup_np)(struct iscsi_np *, struct __kernel_sockaddr_storage *);
+       int (*iscsit_accept_np)(struct iscsi_np *, struct iscsi_conn *);
+       void (*iscsit_free_np)(struct iscsi_np *);
+       void (*iscsit_free_conn)(struct iscsi_conn *);
+       struct iscsi_cmd *(*iscsit_alloc_cmd)(struct iscsi_conn *, gfp_t);
+       int (*iscsit_get_login_rx)(struct iscsi_conn *, struct iscsi_login *);
+       int (*iscsit_put_login_tx)(struct iscsi_conn *, struct iscsi_login *, u32);
+       int (*iscsit_immediate_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
+       int (*iscsit_response_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
+       int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
+       int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
+       int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
+};
+
+/*
+ * From iscsi_target_transport.c
+ */
+
+extern int iscsit_register_transport(struct iscsit_transport *);
+extern void iscsit_unregister_transport(struct iscsit_transport *);
+extern struct iscsit_transport *iscsit_get_transport(int);
+extern void iscsit_put_transport(struct iscsit_transport *);
+
+/*
+ * From iscsi_target.c
+ */
+extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *,
+                               struct iscsi_cmd *);
+extern int iscsit_setup_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+                               unsigned char *);
+extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
+extern int iscsit_process_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+                               struct iscsi_scsi_req *);
+extern int iscsit_check_dataout_hdr(struct iscsi_conn *, unsigned char *,
+                               struct iscsi_cmd **);
+extern int iscsit_check_dataout_payload(struct iscsi_cmd *, struct iscsi_data *,
+                               bool);
+extern int iscsit_handle_nop_out(struct iscsi_conn *, struct iscsi_cmd *,
+                               unsigned char *);
+extern int iscsit_handle_logout_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+                               unsigned char *);
+extern int iscsit_handle_task_mgt_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+                               unsigned char *);
+extern void iscsit_build_rsp_pdu(struct iscsi_cmd *, struct iscsi_conn *,
+                               bool, struct iscsi_scsi_rsp *);
+extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
+                               struct iscsi_nopin *, bool);
+extern void iscsit_build_task_mgt_rsp(struct iscsi_cmd *, struct iscsi_conn *,
+                               struct iscsi_tm_rsp *);
+extern void iscsit_build_reject(struct iscsi_cmd *, struct iscsi_conn *,
+                               struct iscsi_reject *);
+extern int iscsit_build_logout_rsp(struct iscsi_cmd *, struct iscsi_conn *,
+                               struct iscsi_logout_rsp *);
+extern int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+/*
+ * From iscsi_target_device.c
+ */
+extern void iscsit_increment_maxcmdsn(struct iscsi_cmd *, struct iscsi_session *);
+/*
+ * From iscsi_target_erl1.c
+ */
+extern void iscsit_stop_dataout_timer(struct iscsi_cmd *);
+
+/*
+ * From iscsi_target_tmr.c
+ */
+extern int iscsit_tmr_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+
+/*
+ * From iscsi_target_util.c
+ */
+extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
+extern int iscsit_sequence_cmd(struct iscsi_conn *, struct iscsi_cmd *, __be32);