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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+140
-1
+2
-1
drivers/target/iscsi/Makefile
+2
-1
drivers/target/iscsi/Makefile
+55
drivers/target/iscsi/iscsi_target_transport.c
+55
drivers/target/iscsi/iscsi_target_transport.c
···
1
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <target/iscsi/iscsi_transport.h>
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static LIST_HEAD(g_transport_list);
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static DEFINE_MUTEX(transport_mutex);
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struct iscsit_transport *iscsit_get_transport(int type)
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{
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struct iscsit_transport *t;
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mutex_lock(&transport_mutex);
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list_for_each_entry(t, &g_transport_list, t_node) {
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if (t->transport_type == type) {
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if (t->owner && !try_module_get(t->owner)) {
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t = NULL;
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}
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mutex_unlock(&transport_mutex);
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return t;
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}
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}
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mutex_unlock(&transport_mutex);
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return NULL;
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}
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void iscsit_put_transport(struct iscsit_transport *t)
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{
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if (t->owner)
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module_put(t->owner);
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}
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int iscsit_register_transport(struct iscsit_transport *t)
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{
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INIT_LIST_HEAD(&t->t_node);
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mutex_lock(&transport_mutex);
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list_add_tail(&t->t_node, &g_transport_list);
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mutex_unlock(&transport_mutex);
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pr_debug("Registered iSCSI transport: %s\n", t->name);
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return 0;
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}
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EXPORT_SYMBOL(iscsit_register_transport);
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void iscsit_unregister_transport(struct iscsit_transport *t)
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{
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mutex_lock(&transport_mutex);
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list_del(&t->t_node);
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mutex_unlock(&transport_mutex);
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pr_debug("Unregistered iSCSI transport: %s\n", t->name);
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}
55
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EXPORT_SYMBOL(iscsit_unregister_transport);
+83
include/target/iscsi/iscsi_transport.h
+83
include/target/iscsi/iscsi_transport.h
···
1
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#include <linux/module.h>
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#include <linux/list.h>
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#include "../../../drivers/target/iscsi/iscsi_target_core.h"
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struct iscsit_transport {
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#define ISCSIT_TRANSPORT_NAME 16
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char name[ISCSIT_TRANSPORT_NAME];
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int transport_type;
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struct module *owner;
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struct list_head t_node;
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int (*iscsit_setup_np)(struct iscsi_np *, struct __kernel_sockaddr_storage *);
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int (*iscsit_accept_np)(struct iscsi_np *, struct iscsi_conn *);
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void (*iscsit_free_np)(struct iscsi_np *);
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void (*iscsit_free_conn)(struct iscsi_conn *);
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struct iscsi_cmd *(*iscsit_alloc_cmd)(struct iscsi_conn *, gfp_t);
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int (*iscsit_get_login_rx)(struct iscsi_conn *, struct iscsi_login *);
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int (*iscsit_put_login_tx)(struct iscsi_conn *, struct iscsi_login *, u32);
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int (*iscsit_immediate_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
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int (*iscsit_response_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
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int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
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int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
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int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
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};
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/*
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* From iscsi_target_transport.c
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*/
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extern int iscsit_register_transport(struct iscsit_transport *);
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extern void iscsit_unregister_transport(struct iscsit_transport *);
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extern struct iscsit_transport *iscsit_get_transport(int);
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extern void iscsit_put_transport(struct iscsit_transport *);
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+
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/*
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* From iscsi_target.c
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*/
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extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *,
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struct iscsi_cmd *);
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extern int iscsit_setup_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
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extern int iscsit_process_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_scsi_req *);
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extern int iscsit_check_dataout_hdr(struct iscsi_conn *, unsigned char *,
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struct iscsi_cmd **);
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extern int iscsit_check_dataout_payload(struct iscsi_cmd *, struct iscsi_data *,
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bool);
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extern int iscsit_handle_nop_out(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern int iscsit_handle_logout_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern int iscsit_handle_task_mgt_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern void iscsit_build_rsp_pdu(struct iscsi_cmd *, struct iscsi_conn *,
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bool, struct iscsi_scsi_rsp *);
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extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_nopin *, bool);
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extern void iscsit_build_task_mgt_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_tm_rsp *);
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extern void iscsit_build_reject(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_reject *);
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extern int iscsit_build_logout_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_logout_rsp *);
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extern int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
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/*
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* From iscsi_target_device.c
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*/
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extern void iscsit_increment_maxcmdsn(struct iscsi_cmd *, struct iscsi_session *);
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/*
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* From iscsi_target_erl1.c
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*/
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extern void iscsit_stop_dataout_timer(struct iscsi_cmd *);
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/*
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* From iscsi_target_tmr.c
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*/
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extern int iscsit_tmr_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
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/*
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* From iscsi_target_util.c
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*/
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extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
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extern int iscsit_sequence_cmd(struct iscsi_conn *, struct iscsi_cmd *, __be32);