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authorNicholas Bellinger <nab@linux-iscsi.org>2013-03-07 00:53:26 -0500
committerNicholas Bellinger <nab@linux-iscsi.org>2013-04-25 04:05:26 -0400
commit3f99306337ba1871afc8568e8b36004ce3cee039 (patch)
tree897b8e70ebcd2b3973e1657feefd7ba42bab88b3
parent20361e69ba0b52880f9a692bb80aceb989bf0e77 (diff)
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>
Diffstat
-rw-r--r--drivers/target/iscsi/Makefile3
-rw-r--r--drivers/target/iscsi/iscsi_target_transport.c55
-rw-r--r--include/target/iscsi/iscsi_transport.h83
3 files changed, 140 insertions, 1 deletions
diff --git a/drivers/target/iscsi/Makefile b/drivers/target/iscsi/Makefile
index 5b9a2cf7f0a9..13a92403fe3e 100644
--- a/drivers/target/iscsi/Makefile
+++ b/drivers/target/iscsi/Makefile
@@ -15,6 +15,7 @@ iscsi_target_mod-y += iscsi_target_parameters.o \
15 iscsi_target_util.o \ 15 iscsi_target_util.o \
16 iscsi_target.o \ 16 iscsi_target.o \
17 iscsi_target_configfs.o \ 17 iscsi_target_configfs.o \
18 iscsi_target_stat.o 18 iscsi_target_stat.o \
19 iscsi_target_transport.o
19 20
20obj-$(CONFIG_ISCSI_TARGET) += iscsi_target_mod.o 21obj-$(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
index 000000000000..882728fac30c
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target_transport.c
@@ -0,0 +1,55 @@
1#include <linux/spinlock.h>
2#include <linux/list.h>
3#include <target/iscsi/iscsi_transport.h>
4
5static LIST_HEAD(g_transport_list);
6static DEFINE_MUTEX(transport_mutex);
7
8struct iscsit_transport *iscsit_get_transport(int type)
9{
10 struct iscsit_transport *t;
11
12 mutex_lock(&transport_mutex);
13 list_for_each_entry(t, &g_transport_list, t_node) {
14 if (t->transport_type == type) {
15 if (t->owner && !try_module_get(t->owner)) {
16 t = NULL;
17 }
18 mutex_unlock(&transport_mutex);
19 return t;
20 }
21 }
22 mutex_unlock(&transport_mutex);
23
24 return NULL;
25}
26
27void iscsit_put_transport(struct iscsit_transport *t)
28{
29 if (t->owner)
30 module_put(t->owner);
31}
32
33int iscsit_register_transport(struct iscsit_transport *t)
34{
35 INIT_LIST_HEAD(&t->t_node);
36
37 mutex_lock(&transport_mutex);
38 list_add_tail(&t->t_node, &g_transport_list);
39 mutex_unlock(&transport_mutex);
40
41 pr_debug("Registered iSCSI transport: %s\n", t->name);
42
43 return 0;
44}
45EXPORT_SYMBOL(iscsit_register_transport);
46
47void iscsit_unregister_transport(struct iscsit_transport *t)
48{
49 mutex_lock(&transport_mutex);
50 list_del(&t->t_node);
51 mutex_unlock(&transport_mutex);
52
53 pr_debug("Unregistered iSCSI transport: %s\n", t->name);
54}
55EXPORT_SYMBOL(iscsit_unregister_transport);
diff --git a/include/target/iscsi/iscsi_transport.h b/include/target/iscsi/iscsi_transport.h
new file mode 100644
index 000000000000..23a87d0cd72c
--- /dev/null
+++ b/include/target/iscsi/iscsi_transport.h
@@ -0,0 +1,83 @@
1#include <linux/module.h>
2#include <linux/list.h>
3#include "../../../drivers/target/iscsi/iscsi_target_core.h"
4
5struct iscsit_transport {
6#define ISCSIT_TRANSPORT_NAME 16
7 char name[ISCSIT_TRANSPORT_NAME];
8 int transport_type;
9 struct module *owner;
10 struct list_head t_node;
11 int (*iscsit_setup_np)(struct iscsi_np *, struct __kernel_sockaddr_storage *);
12 int (*iscsit_accept_np)(struct iscsi_np *, struct iscsi_conn *);
13 void (*iscsit_free_np)(struct iscsi_np *);
14 void (*iscsit_free_conn)(struct iscsi_conn *);
15 struct iscsi_cmd *(*iscsit_alloc_cmd)(struct iscsi_conn *, gfp_t);
16 int (*iscsit_get_login_rx)(struct iscsi_conn *, struct iscsi_login *);
17 int (*iscsit_put_login_tx)(struct iscsi_conn *, struct iscsi_login *, u32);
18 int (*iscsit_immediate_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
19 int (*iscsit_response_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
20 int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
21 int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
22 int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
23};
24
25/*
26 * From iscsi_target_transport.c
27 */
28
29extern int iscsit_register_transport(struct iscsit_transport *);
30extern void iscsit_unregister_transport(struct iscsit_transport *);
31extern struct iscsit_transport *iscsit_get_transport(int);
32extern void iscsit_put_transport(struct iscsit_transport *);
33
34/*
35 * From iscsi_target.c
36 */
37extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *,
38 struct iscsi_cmd *);
39extern int iscsit_setup_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
40 unsigned char *);
41extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
42extern int iscsit_process_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
43 struct iscsi_scsi_req *);
44extern int iscsit_check_dataout_hdr(struct iscsi_conn *, unsigned char *,
45 struct iscsi_cmd **);
46extern int iscsit_check_dataout_payload(struct iscsi_cmd *, struct iscsi_data *,
47 bool);
48extern int iscsit_handle_nop_out(struct iscsi_conn *, struct iscsi_cmd *,
49 unsigned char *);
50extern int iscsit_handle_logout_cmd(struct iscsi_conn *, struct iscsi_cmd *,
51 unsigned char *);
52extern int iscsit_handle_task_mgt_cmd(struct iscsi_conn *, struct iscsi_cmd *,
53 unsigned char *);
54extern void iscsit_build_rsp_pdu(struct iscsi_cmd *, struct iscsi_conn *,
55 bool, struct iscsi_scsi_rsp *);
56extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
57 struct iscsi_nopin *, bool);
58extern void iscsit_build_task_mgt_rsp(struct iscsi_cmd *, struct iscsi_conn *,
59 struct iscsi_tm_rsp *);
60extern void iscsit_build_reject(struct iscsi_cmd *, struct iscsi_conn *,
61 struct iscsi_reject *);
62extern int iscsit_build_logout_rsp(struct iscsi_cmd *, struct iscsi_conn *,
63 struct iscsi_logout_rsp *);
64extern int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
65/*
66 * From iscsi_target_device.c
67 */
68extern void iscsit_increment_maxcmdsn(struct iscsi_cmd *, struct iscsi_session *);
69/*
70 * From iscsi_target_erl1.c
71 */
72extern void iscsit_stop_dataout_timer(struct iscsi_cmd *);
73
74/*
75 * From iscsi_target_tmr.c
76 */
77extern int iscsit_tmr_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
78
79/*
80 * From iscsi_target_util.c
81 */
82extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
83extern int iscsit_sequence_cmd(struct iscsi_conn *, struct iscsi_cmd *, __be32);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 08:59:02 -0500