diff options
author | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-03-06 21:53:26 -0800 |
---|---|---|
committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-04-25 01:05:26 -0700 |
commit | 3f99306337ba1871afc8568e8b36004ce3cee039 (patch) | |
tree | 897b8e70ebcd2b3973e1657feefd7ba42bab88b3 /drivers/target | |
parent | 20361e69ba0b52880f9a692bb80aceb989bf0e77 (diff) | |
download | linux-3f99306337ba1871afc8568e8b36004ce3cee039.tar.bz2 |
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 (limited to 'drivers/target')
-rw-r--r-- | drivers/target/iscsi/Makefile | 3 | ||||
-rw-r--r-- | drivers/target/iscsi/iscsi_target_transport.c | 55 |
2 files changed, 57 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 \ 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 index 000000000000..882728fac30c --- /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); |