bdev: Separate the module header from the public header
Bdev modules need a separate interface than public consumers of the blockdevs. Change-Id: I581ee493570c114f7e96b31a425bc077a791c71e Signed-off-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
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ecb6e49d09
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6e09a48e42
@ -56,40 +56,6 @@
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struct spdk_bdev_io;
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struct spdk_bdev_io;
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/** \page block_backend_modules Block Device Backend Modules
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To implement a backend block device driver, a number of functions
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dictated by struct spdk_bdev_fn_table must be provided.
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The module should register itself using SPDK_BDEV_MODULE_REGISTER or
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SPDK_VBDEV_MODULE_REGISTER to define the parameters for the module.
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Use SPDK_BDEV_MODULE_REGISTER for all block backends that are real disks.
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Any virtual backends such as RAID, partitioning, etc. should use
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SPDK_VBDEV_MODULE_REGISTER.
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<hr>
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In the module initialization code, the config file sections can be parsed to
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acquire custom configuration parameters. For example, if the config file has
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a section such as below:
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<blockquote><pre>
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[MyBE]
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MyParam 1234
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</pre></blockquote>
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The value can be extracted as the example below:
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<blockquote><pre>
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struct spdk_conf_section *sp = spdk_conf_find_section(NULL, "MyBe");
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int my_param = spdk_conf_section_get_intval(sp, "MyParam");
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</pre></blockquote>
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The backend initialization routine also need to create "disks". A virtual
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representation of each LUN must be constructed. Mainly a struct spdk_bdev
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must be passed to the bdev database via spdk_bdev_register().
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*/
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/**
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/**
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* \brief SPDK block device.
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* \brief SPDK block device.
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*
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*
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@ -320,53 +286,8 @@ struct spdk_bdev_io {
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/* No members may be added after driver_ctx! */
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/* No members may be added after driver_ctx! */
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};
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};
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/** Block device module */
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struct spdk_bdev_module_if {
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/**
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* Initialization function for the module. Called by the spdk
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* application during startup.
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*
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* Modules are required to define this function.
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*/
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int (*module_init)(void);
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/**
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* Finish function for the module. Called by the spdk application
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* before the spdk application exits to perform any necessary cleanup.
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*
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* Modules are not required to define this function.
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*/
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void (*module_fini)(void);
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/**
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* Function called to return a text string representing the
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* module's configuration options for inclusion in a configuration file.
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*/
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void (*config_text)(FILE *fp);
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/** Name for the modules being defined. */
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const char *module_name;
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/**
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* Returns the allocation size required for the backend for uses such as local
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* command structs, local SGL, iovecs, or other user context.
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*/
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int (*get_ctx_size)(void);
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TAILQ_ENTRY(spdk_bdev_module_if) tailq;
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};
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/* The blockdev API has two distinct parts. The first portion of the API
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* is to be used by the layer above the blockdev in order to communicate
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* with it. The second portion of the API is to be used by the blockdev
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* modules themselves to perform operations like completing I/O.
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*/
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/* The following functions are intended to be called from the upper layer
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* that is using the blockdev layer.
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*/
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struct spdk_bdev *spdk_bdev_get_by_name(const char *bdev_name);
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struct spdk_bdev *spdk_bdev_get_by_name(const char *bdev_name);
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void spdk_bdev_unregister(struct spdk_bdev *bdev);
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struct spdk_bdev *spdk_bdev_first(void);
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struct spdk_bdev *spdk_bdev_first(void);
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struct spdk_bdev *spdk_bdev_next(struct spdk_bdev *prev);
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struct spdk_bdev *spdk_bdev_next(struct spdk_bdev *prev);
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@ -392,55 +313,8 @@ struct spdk_bdev_io *spdk_bdev_flush(struct spdk_bdev *bdev,
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spdk_bdev_io_completion_cb cb, void *cb_arg);
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spdk_bdev_io_completion_cb cb, void *cb_arg);
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int spdk_bdev_io_submit(struct spdk_bdev_io *bdev_io);
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int spdk_bdev_io_submit(struct spdk_bdev_io *bdev_io);
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void spdk_bdev_do_work(void *ctx);
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void spdk_bdev_do_work(void *ctx);
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int spdk_bdev_reset(struct spdk_bdev *bdev, enum spdk_bdev_reset_type reset_type,
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int spdk_bdev_free_io(struct spdk_bdev_io *bdev_io);
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int spdk_bdev_reset(struct spdk_bdev *bdev, enum spdk_bdev_reset_type,
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spdk_bdev_io_completion_cb cb, void *cb_arg);
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spdk_bdev_io_completion_cb cb, void *cb_arg);
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/* The remaining functions are intended to be called from within
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* blockdev modules.
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*/
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void spdk_bdev_register(struct spdk_bdev *bdev);
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void spdk_bdev_unregister(struct spdk_bdev *bdev);
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int spdk_bdev_free_io(struct spdk_bdev_io *bdev_io);
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void spdk_bdev_io_get_rbuf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_rbuf_cb cb);
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struct spdk_bdev_io *spdk_bdev_get_io(void);
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struct spdk_bdev_io *spdk_bdev_get_child_io(struct spdk_bdev_io *parent,
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struct spdk_bdev *bdev,
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spdk_bdev_io_completion_cb cb,
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void *cb_arg);
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void spdk_bdev_io_complete(struct spdk_bdev_io *bdev_io,
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enum spdk_bdev_io_status status);
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void spdk_bdev_module_list_add(struct spdk_bdev_module_if *bdev_module);
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void spdk_vbdev_module_list_add(struct spdk_bdev_module_if *vbdev_module);
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static inline struct spdk_bdev_io *
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spdk_bdev_io_from_ctx(void *ctx)
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{
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return (struct spdk_bdev_io *)
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((uintptr_t)ctx - offsetof(struct spdk_bdev_io, driver_ctx));
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}
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#define SPDK_BDEV_MODULE_REGISTER(init_fn, fini_fn, config_fn, ctx_size_fn) \
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static struct spdk_bdev_module_if init_fn ## _if = { \
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.module_init = init_fn, \
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.module_fini = fini_fn, \
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.config_text = config_fn, \
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.get_ctx_size = ctx_size_fn, \
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}; \
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__attribute__((constructor)) static void init_fn ## _init(void) \
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{ \
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spdk_bdev_module_list_add(&init_fn ## _if); \
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}
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#define SPDK_VBDEV_MODULE_REGISTER(init_fn, fini_fn, config_fn, ctx_size_fn) \
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static struct spdk_bdev_module_if init_fn ## _if = { \
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.module_init = init_fn, \
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.module_fini = fini_fn, \
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.config_text = config_fn, \
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.get_ctx_size = ctx_size_fn, \
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}; \
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__attribute__((constructor)) static void init_fn ## _init(void) \
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{ \
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spdk_vbdev_module_list_add(&init_fn ## _if); \
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}
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#endif /* SPDK_BDEV_H_ */
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#endif /* SPDK_BDEV_H_ */
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@ -34,7 +34,7 @@
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SPDK_ROOT_DIR := $(abspath $(CURDIR)/../..)
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SPDK_ROOT_DIR := $(abspath $(CURDIR)/../..)
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include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
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include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
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CFLAGS += $(DPDK_INC)
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CFLAGS += $(DPDK_INC) -I.
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C_SRCS = bdev.c
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C_SRCS = bdev.c
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LIBNAME = bdev
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LIBNAME = bdev
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@ -34,6 +34,7 @@
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SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
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SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
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include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
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include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
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CFLAGS += -I$(SPDK_ROOT_DIR)/lib/bdev/
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C_SRCS = blockdev_aio.c blockdev_aio_rpc.c
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C_SRCS = blockdev_aio.c blockdev_aio_rpc.c
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LIBNAME = bdev_aio
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LIBNAME = bdev_aio
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@ -40,6 +40,8 @@
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#include "spdk/queue.h"
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#include "spdk/queue.h"
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#include "spdk/bdev.h"
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#include "spdk/bdev.h"
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#include "bdev_module.h"
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struct blockdev_aio_task {
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struct blockdev_aio_task {
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struct iocb iocb;
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struct iocb iocb;
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uint64_t len;
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uint64_t len;
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@ -49,6 +49,8 @@
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#include "spdk/log.h"
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#include "spdk/log.h"
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#include "spdk/queue.h"
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#include "spdk/queue.h"
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#include "bdev_module.h"
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#define SPDK_BDEV_IO_POOL_SIZE (64 * 1024)
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#define SPDK_BDEV_IO_POOL_SIZE (64 * 1024)
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#define RBUF_SMALL_POOL_SIZE 8192
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#define RBUF_SMALL_POOL_SIZE 8192
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#define RBUF_LARGE_POOL_SIZE 1024
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#define RBUF_LARGE_POOL_SIZE 1024
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167
lib/bdev/bdev_module.h
Normal file
167
lib/bdev/bdev_module.h
Normal file
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/*-
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* BSD LICENSE
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*
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* Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* Block Device Module Interface
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*/
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#ifndef SPDK_BDEV_MODULE_H_
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#define SPDK_BDEV_MODULE_H_
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#include <inttypes.h>
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#include <unistd.h>
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#include <stddef.h> /* for offsetof */
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#include <sys/uio.h> /* for struct iovec */
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#include <stdbool.h>
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#include "spdk/bdev.h"
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#include "spdk/event.h"
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#include "spdk/queue.h"
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#include "spdk/scsi_spec.h"
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/** \page block_backend_modules Block Device Backend Modules
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To implement a backend block device driver, a number of functions
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dictated by struct spdk_bdev_fn_table must be provided.
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The module should register itself using SPDK_BDEV_MODULE_REGISTER or
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SPDK_VBDEV_MODULE_REGISTER to define the parameters for the module.
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Use SPDK_BDEV_MODULE_REGISTER for all block backends that are real disks.
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Any virtual backends such as RAID, partitioning, etc. should use
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SPDK_VBDEV_MODULE_REGISTER.
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<hr>
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In the module initialization code, the config file sections can be parsed to
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acquire custom configuration parameters. For example, if the config file has
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a section such as below:
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<blockquote><pre>
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[MyBE]
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MyParam 1234
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</pre></blockquote>
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The value can be extracted as the example below:
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<blockquote><pre>
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struct spdk_conf_section *sp = spdk_conf_find_section(NULL, "MyBe");
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int my_param = spdk_conf_section_get_intval(sp, "MyParam");
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</pre></blockquote>
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The backend initialization routine also need to create "disks". A virtual
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representation of each LUN must be constructed. Mainly a struct spdk_bdev
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must be passed to the bdev database via spdk_bdev_register().
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*/
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/** Block device module */
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struct spdk_bdev_module_if {
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/**
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* Initialization function for the module. Called by the spdk
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* application during startup.
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*
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* Modules are required to define this function.
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*/
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int (*module_init)(void);
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/**
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* Finish function for the module. Called by the spdk application
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* before the spdk application exits to perform any necessary cleanup.
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*
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* Modules are not required to define this function.
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*/
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void (*module_fini)(void);
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/**
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* Function called to return a text string representing the
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* module's configuration options for inclusion in a configuration file.
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*/
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void (*config_text)(FILE *fp);
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/** Name for the modules being defined. */
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const char *module_name;
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/**
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* Returns the allocation size required for the backend for uses such as local
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* command structs, local SGL, iovecs, or other user context.
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*/
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int (*get_ctx_size)(void);
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TAILQ_ENTRY(spdk_bdev_module_if) tailq;
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};
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void spdk_bdev_register(struct spdk_bdev *bdev);
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void spdk_bdev_io_get_rbuf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_rbuf_cb cb);
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struct spdk_bdev_io *spdk_bdev_get_io(void);
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struct spdk_bdev_io *spdk_bdev_get_child_io(struct spdk_bdev_io *parent,
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struct spdk_bdev *bdev,
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spdk_bdev_io_completion_cb cb,
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void *cb_arg);
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void spdk_bdev_io_complete(struct spdk_bdev_io *bdev_io,
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enum spdk_bdev_io_status status);
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void spdk_bdev_module_list_add(struct spdk_bdev_module_if *bdev_module);
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void spdk_vbdev_module_list_add(struct spdk_bdev_module_if *vbdev_module);
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static inline struct spdk_bdev_io *
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spdk_bdev_io_from_ctx(void *ctx)
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{
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return (struct spdk_bdev_io *)
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((uintptr_t)ctx - offsetof(struct spdk_bdev_io, driver_ctx));
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}
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#define SPDK_BDEV_MODULE_REGISTER(init_fn, fini_fn, config_fn, ctx_size_fn) \
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static struct spdk_bdev_module_if init_fn ## _if = { \
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.module_init = init_fn, \
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.module_fini = fini_fn, \
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||||||
|
.config_text = config_fn, \
|
||||||
|
.get_ctx_size = ctx_size_fn, \
|
||||||
|
}; \
|
||||||
|
__attribute__((constructor)) static void init_fn ## _init(void) \
|
||||||
|
{ \
|
||||||
|
spdk_bdev_module_list_add(&init_fn ## _if); \
|
||||||
|
}
|
||||||
|
|
||||||
|
#define SPDK_VBDEV_MODULE_REGISTER(init_fn, fini_fn, config_fn, ctx_size_fn) \
|
||||||
|
static struct spdk_bdev_module_if init_fn ## _if = { \
|
||||||
|
.module_init = init_fn, \
|
||||||
|
.module_fini = fini_fn, \
|
||||||
|
.config_text = config_fn, \
|
||||||
|
.get_ctx_size = ctx_size_fn, \
|
||||||
|
}; \
|
||||||
|
__attribute__((constructor)) static void init_fn ## _init(void) \
|
||||||
|
{ \
|
||||||
|
spdk_vbdev_module_list_add(&init_fn ## _if); \
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* SPDK_BDEV_MODULE_H_ */
|
@ -34,7 +34,7 @@
|
|||||||
SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
|
SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
|
||||||
include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
|
include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
|
||||||
|
|
||||||
CFLAGS += $(DPDK_INC)
|
CFLAGS += $(DPDK_INC) -I$(SPDK_ROOT_DIR)/lib/bdev/
|
||||||
C_SRCS = blockdev_malloc.c blockdev_malloc_rpc.c
|
C_SRCS = blockdev_malloc.c blockdev_malloc_rpc.c
|
||||||
LIBNAME = bdev_malloc
|
LIBNAME = bdev_malloc
|
||||||
|
|
||||||
|
@ -44,6 +44,8 @@
|
|||||||
#include "spdk/log.h"
|
#include "spdk/log.h"
|
||||||
#include "spdk/copy_engine.h"
|
#include "spdk/copy_engine.h"
|
||||||
|
|
||||||
|
#include "bdev_module.h"
|
||||||
|
|
||||||
struct malloc_disk {
|
struct malloc_disk {
|
||||||
struct spdk_bdev disk; /* this must be the first element */
|
struct spdk_bdev disk; /* this must be the first element */
|
||||||
void *malloc_buf;
|
void *malloc_buf;
|
||||||
|
@ -34,7 +34,7 @@
|
|||||||
SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
|
SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../..)
|
||||||
include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
|
include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
|
||||||
|
|
||||||
CFLAGS += $(DPDK_INC)
|
CFLAGS += $(DPDK_INC) -I$(SPDK_ROOT_DIR)/lib/bdev/
|
||||||
C_SRCS = blockdev_nvme.c
|
C_SRCS = blockdev_nvme.c
|
||||||
LIBNAME = bdev_nvme
|
LIBNAME = bdev_nvme
|
||||||
|
|
||||||
|
@ -53,6 +53,8 @@
|
|||||||
#include "spdk/bdev.h"
|
#include "spdk/bdev.h"
|
||||||
#include "spdk/nvme.h"
|
#include "spdk/nvme.h"
|
||||||
|
|
||||||
|
#include "bdev_module.h"
|
||||||
|
|
||||||
#define MAX_NVME_NAME_LENGTH 64
|
#define MAX_NVME_NAME_LENGTH 64
|
||||||
|
|
||||||
void init_request_mempool(void);
|
void init_request_mempool(void);
|
||||||
|
Loading…
Reference in New Issue
Block a user