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55f76cfb0cdba9a52357117495ecccba6c8cffcc
libiscsi/include/iscsi.h
Peter Lieven 55f76cfb0c SCSI add support for iovectors 
If an application passes buffers to libiscsi for reading they are
currently added to a linked list one by one. This leads to a malloc
for each buffer object plus O(n) walks trough the list to add
the buffer to then end of the list. Additionally the buffer read
routine takes up to O(n) iterations to find the right buffer
for a request.

This patch introduces an scsi_iovector struct to pass buffers to
an scsi task. Adding a new buffer is in O(1) and finding the
right buffer to also. Malloc requirements are in O(log(n)).

Additionally the scsi_iovector struct is itended to be binary
compatible to an QEMUIOVector allowing to pass this structure
directly to the library.

Initial tests have been made booting an Ubuntu LTS 12.04.1
Desktop server up to the login prompt. The following observations
have been made with regards to scsi_malloc calls:

original implementation:	~11.500 mallocs
using iovector instead of list:	~ 7.500 mallocs
passing the iovector directly:        0 mallocs

To enable this feature in qemu for testing the following patch might
be used:

diff --git a/block/iscsi.c b/block/iscsi.c
index a6a819d..2809c15 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -390,11 +390,16 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
         return NULL;
     }

+#if defined(LIBISCSI_FEATURE_IOVECTOR)
+    assert(sizeof(struct QEMUIOVector) == sizeof(struct scsi_iovector));
+    scsi_iovector_assign(acb->task, (struct scsi_iovector*) acb->qiov);
+#else
     for (i = 0; i < acb->qiov->niov; i++) {
         scsi_task_add_data_in_buffer(acb->task,
                 acb->qiov->iov[i].iov_len,
                 acb->qiov->iov[i].iov_base);
     }
+#endif

     iscsi_set_events(iscsilun);

---
Signed-off-by: Peter Lieven <pl@kamp.de>
2012-11-21 17:02:59 +01:00

1044 lines
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/*
Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __iscsi_h__
#define __iscsi_h__
#include <stdint.h>
#include <sys/types.h>
#if defined(WIN32)
#define EXTERN __declspec( dllexport )
#else
#define EXTERN
#endif
#ifdef __cplusplus
extern "C" {
#endif
struct iscsi_context;
struct sockaddr;
/* FEATURES */
#define LIBISCSI_FEATURE_IOVECTOR (1)
#define MAX_STRING_SIZE (255)
/*
* Syntax for normal and portal/discovery URLs.
*/
#define ISCSI_URL_SYNTAX "\"iscsi://[<username>[%<password>]@]" \
"<host>[:<port>]/<target-iqn>/<lun>\""
#define ISCSI_PORTAL_URL_SYNTAX "\"iscsi://[<username>[%<password>]@]" \
"<host>[:<port>]\""
/*
* The following three functions are used to integrate libiscsi in an event
* system.
*/
/*
* Returns the file descriptor that libiscsi uses.
*/
EXTERN int iscsi_get_fd(struct iscsi_context *iscsi);
/*
* Returns which events that we need to poll for for the iscsi file descriptor.
*/
EXTERN int iscsi_which_events(struct iscsi_context *iscsi);
/*
* Called to process the events when events become available for the iscsi
* file descriptor.
*/
EXTERN int iscsi_service(struct iscsi_context *iscsi, int revents);
/*
* How many commands are in flight.
*/
EXTERN int iscsi_queue_length(struct iscsi_context *iscsi);
/*
* To set tcp keepalive for the session.
* Only options supported by given platform (if any) are set.
*/
int iscsi_set_tcp_keepalive(struct iscsi_context *iscsi, int idle, int count, int interval);
struct iscsi_url {
char portal[MAX_STRING_SIZE+1];
char target[MAX_STRING_SIZE+1];
char user[MAX_STRING_SIZE+1];
char passwd[MAX_STRING_SIZE+1];
int lun;
struct iscsi_context *iscsi;
};
/*
* This function is used to parse an iSCSI URL into a iscsi_url structure.
* iSCSI URL format :
* iscsi://[<username>[%<password>]@]<host>[:<port>]/<target-iqn>/<lun>
*
* Function will return a pointer to an iscsi url structure if successful,
* or it will return NULL and set iscsi_get_error() accrodingly if there was a problem
* with the URL.
*
* CHAP username/password can also be provided via environment variables
* LIBISCSI_CHAP_USERNAME=ronnie
* LIBISCSI_CHAP_PASSWORD=password
*
* The returned structure is freed by calling iscsi_destroy_url()
*/
EXTERN struct iscsi_url *iscsi_parse_full_url(struct iscsi_context *iscsi, const char *url);
EXTERN void iscsi_destroy_url(struct iscsi_url *iscsi_url);
/*
* This function is used to parse an iSCSI Portal URL into a iscsi_url structure.
* iSCSI Portal URL format :
* iscsi://[<username>[%<password>]@]<host>[:<port>]
*
* iSCSI Portal URL is used when describing a discovery session, where the target-iqn and the
* lun is not yet known.
*
* Function will return a pointer to an iscsi url structure if successful,
* or it will return NULL and set iscsi_get_error() accrodingly if there was a problem
* with the URL.
*
* CHAP username/password can also be provided via environment variables
* LIBISCSI_CHAP_USERNAME=ronnie
* LIBISCSI_CHAP_PASSWORD=password
*
* The returned structure is freed by calling iscsi_destroy_url()
*/
EXTERN struct iscsi_url *
iscsi_parse_portal_url(struct iscsi_context *iscsi, const char *url);
/*
* This function returns a description of the last encountered error.
*/
EXTERN const char *iscsi_get_error(struct iscsi_context *iscsi);
/*
* Create a context for an ISCSI session.
* Initiator_name is the iqn name we want to identify to the target as.
*
* Returns:
* 0: success
* <0: error
*/
EXTERN struct iscsi_context *iscsi_create_context(const char *initiator_name);
/*
* Destroy an existing ISCSI context and tear down any existing connection.
* Callbacks for any command in flight will be invoked with
* ISCSI_STATUS_CANCELLED.
*
* Returns:
* 0: success
* <0: error
*/
EXTERN int iscsi_destroy_context(struct iscsi_context *iscsi);
/*
* Set an optional alias name to identify with when connecting to the target
*
* Returns:
* 0: success
* <0: error
*/
EXTERN int iscsi_set_alias(struct iscsi_context *iscsi, const char *alias);
/*
* Set the iqn name of the taqget to login to.
* The target name must be set before a normal-login can be initiated.
* Only discovery-logins are possible without setting the target iqn name.
*
* Returns:
* 0: success
* <0: error
*/
EXTERN int iscsi_set_targetname(struct iscsi_context *iscsi, const char *targetname);
/*
* This function returns any target address supplied in a login response when
* the target has moved.
*/
EXTERN const char *iscsi_get_target_address(struct iscsi_context *iscsi);
/* Type of iscsi sessions. Discovery sessions are used to query for what
* targets exist behind the portal connected to. Normal sessions are used to
* log in and do I/O to the SCSI LUNs
*/
enum iscsi_session_type {
ISCSI_SESSION_DISCOVERY = 1,
ISCSI_SESSION_NORMAL = 2
};
/*
* Set the session type for a scsi context.
* Session type can only be set/changed before the context
* is logged in to the target.
*
* Returns:
* 0: success
* <0: error
*/
EXTERN int iscsi_set_session_type(struct iscsi_context *iscsi,
enum iscsi_session_type session_type);
/*
* Types of header digest we support. Default is NONE
*/
enum iscsi_header_digest {
ISCSI_HEADER_DIGEST_NONE = 0,
ISCSI_HEADER_DIGEST_NONE_CRC32C = 1,
ISCSI_HEADER_DIGEST_CRC32C_NONE = 2,
ISCSI_HEADER_DIGEST_CRC32C = 3,
ISCSI_HEADER_DIGEST_LAST = ISCSI_HEADER_DIGEST_CRC32C
};
/*
* Set the desired header digest for a scsi context.
* Header digest can only be set/changed before the context
* is logged in to the target.
*
* Returns:
* 0: success
* <0: error
*/
EXTERN int iscsi_set_header_digest(struct iscsi_context *iscsi,
enum iscsi_header_digest header_digest);
/*
* Specify the username and password to use for chap authentication
*/
EXTERN int iscsi_set_initiator_username_pwd(struct iscsi_context *iscsi,
const char *user,
const char *passwd);
/*
* check if the context is logged in or not
*/
EXTERN int iscsi_is_logged_in(struct iscsi_context *iscsi);
enum scsi_status {
SCSI_STATUS_GOOD = 0,
SCSI_STATUS_CHECK_CONDITION = 2,
SCSI_STATUS_RESERVATION_CONFLICT = 0x18,
SCSI_STATUS_REDIRECT = 0x101,
SCSI_STATUS_CANCELLED = 0x0f000000,
SCSI_STATUS_ERROR = 0x0f000001
};
/*
* Generic callback for completion of iscsi_*_async().
* command_data depends on status.
*/
typedef void (*iscsi_command_cb)(struct iscsi_context *iscsi, int status,
void *command_data, void *private_data);
/*
* Asynchronous call to connect a TCP connection to the target-host/port
*
* Returns:
* 0 if the call was initiated and a connection will be attempted. Result of
* the connection will be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* This command is unique in that the callback can be invoked twice.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : Connection was successful. Command_data is NULL.
* In this case the callback will be invoked a
* second time once the connection is torn down.
*
* ISCSI_STATUS_ERROR : Either failed to establish the connection, or
* an already established connection has failed
* with an error.
*
* The callback will NOT be invoked if the session is explicitely torn down
* through a call to iscsi_disconnect() or iscsi_destroy_context().
*/
EXTERN int iscsi_connect_async(struct iscsi_context *iscsi, const char *portal,
iscsi_command_cb cb, void *private_data);
/*
* Synchronous call to connect a TCP connection to the target-host/port
*
* Returns:
* 0 if connected successfully.
* <0 if there was an error.
*
*/
EXTERN int iscsi_connect_sync(struct iscsi_context *iscsi, const char *portal);
/*
* Asynchronous call to connect a lun
* This function will connect to the portal, login, and verify that the lun
* is available.
*
* Returns:
* 0 if the call was initiated and a connection will be attempted. Result
* of the connection will be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* This command is unique in that the callback can be invoked twice.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : Connection was successful. Command_data is NULL.
* In this case the callback will be invoked a
* second time once the connection is torn down.
*
* ISCSI_STATUS_ERROR : Either failed to establish the connection, or
* an already established connection has failed
* with an error.
*
* The callback will NOT be invoked if the session is explicitely torn down
* through a call to iscsi_disconnect() or iscsi_destroy_context().
*/
EXTERN int iscsi_full_connect_async(struct iscsi_context *iscsi, const char *portal,
int lun, iscsi_command_cb cb, void *private_data);
/*
* Synchronous call to connect a lun
* This function will connect to the portal, login, and verify that the lun
* is available.
*
* Returns:
* 0 if the cconnect was successful.
* <0 if there was an error.
*/
EXTERN int iscsi_full_connect_sync(struct iscsi_context *iscsi, const char *portal,
int lun);
/*
* Disconnect a connection to a target.
* You can not disconnect while being logged in to a target.
*
* Returns:
* 0 disconnect was successful
* <0 error
*/
EXTERN int iscsi_disconnect(struct iscsi_context *iscsi);
/*
* Disconnect a connection to a target and try to reconnect.
*
* Returns:
* 0 reconnect was successful
* <0 error
*/
EXTERN int iscsi_reconnect(struct iscsi_context *iscsi);
/*
* Asynchronous call to perform an ISCSI login.
*
* Returns:
* 0 if the call was initiated and a login will be attempted. Result of the
* login will be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : login was successful. Command_data is always
* NULL.
* ISCSI_STATUS_CANCELLED: login was aborted. Command_data is NULL.
* ISCSI_STATUS_ERROR : login failed. Command_data is NULL.
*/
EXTERN int iscsi_login_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data);
/*
* Synchronous call to perform an ISCSI login.
*
* Returns:
* 0 if the login was successful
* <0 if there was an error.
*/
EXTERN int iscsi_login_sync(struct iscsi_context *iscsi);
/*
* Asynchronous call to perform an ISCSI logout.
*
* Returns:
* 0 if the call was initiated and a logout will be attempted. Result of the
* logout will be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : logout was successful. Command_data is always
* NULL.
* ISCSI_STATUS_CANCELLED: logout was aborted. Command_data is NULL.
*/
EXTERN int iscsi_logout_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data);
/*
* Synchronous call to perform an ISCSI logout.
*
* Returns:
* 0 if the logout was successful
* <0 if there was an error.
*/
EXTERN int iscsi_logout_sync(struct iscsi_context *iscsi);
/*
* Asynchronous call to perform an ISCSI discovery.
*
* discoveries can only be done on connected and logged in discovery sessions.
*
* Returns:
* 0 if the call was initiated and a discovery will be attempted. Result
* of the logout will be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : Discovery was successful. Command_data is a
* pointer to a iscsi_discovery_address list of
* structures.
* This list of structures is only valid for the
* duration of the callback and all data will be
* freed once the callback returns.
* ISCSI_STATUS_CANCELLED: Discovery was aborted. Command_data is NULL.
*/
EXTERN int iscsi_discovery_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data);
struct iscsi_discovery_address {
struct iscsi_discovery_address *next;
const char *target_name;
const char *target_address;
};
/*
* Asynchronous call to perform an ISCSI NOP-OUT call
*
* Returns:
* 0 if the call was initiated and a nop-out will be attempted. Result will
* be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : NOP-OUT was successful and the server responded
* with a NOP-IN callback_data is a iscsi_data
* structure containing the data returned from
* the server.
* ISCSI_STATUS_CANCELLED: Discovery was aborted. Command_data is NULL.
*/
EXTERN int iscsi_nop_out_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
unsigned char *data, int len, void *private_data);
struct scsi_task;
enum iscsi_task_mgmt_funcs {
ISCSI_TM_ABORT_TASK = 0x01,
ISCSI_TM_ABORT_TASK_SET = 0x02,
ISCSI_TM_CLEAR_ACA = 0x03,
ISCSI_TM_CLEAR_TASK_SET = 0x04,
ISCSI_TM_LUN_RESET = 0x05,
ISCSI_TM_TARGET_WARM_RESET = 0x06,
ISCSI_TM_TARGET_COLD_RESET = 0x07,
ISCSI_TM_TASK_REASSIGN = 0x08
};
/*
* Asynchronous call for task management
*
* Returns:
* 0 if the call was initiated and the task mgmt function will be invoked.
* the connection will be reported through the callback function.
* <0 if there was an error. The callback function will not be invoked.
*
* Callback parameters :
* status can be either of :
* ISCSI_STATUS_GOOD : Connection was successful. Command_data is a pointer to uint32_t
* containing the response code as per RFC3720/10.6.1
*
* ISCSI_STATUS_ERROR : Error.
*
* The callback will NOT be invoked if the session is explicitely torn down
* through a call to iscsi_disconnect() or iscsi_destroy_context().
*
* abort_task will also cancel the scsi task. The callback for the scsi task will be invoked with
* SCSI_STATUS_CANCELLED
* abort_task_set, lun_reset, target_warn_reset, target_cold_reset will cancel all tasks. The callback for
* all tasks will be invoked with SCSI_STATUS_CANCELLED
*/
EXTERN int
iscsi_task_mgmt_async(struct iscsi_context *iscsi,
int lun, enum iscsi_task_mgmt_funcs function,
uint32_t ritt, uint32_t rcmdscn,
iscsi_command_cb cb, void *private_data);
EXTERN int
iscsi_task_mgmt_abort_task_async(struct iscsi_context *iscsi,
struct scsi_task *task,
iscsi_command_cb cb, void *private_data);
EXTERN int
iscsi_task_mgmt_abort_task_set_async(struct iscsi_context *iscsi,
uint32_t lun,
iscsi_command_cb cb, void *private_data);
EXTERN int
iscsi_task_mgmt_lun_reset_async(struct iscsi_context *iscsi,
uint32_t lun,
iscsi_command_cb cb, void *private_data);
EXTERN int
iscsi_task_mgmt_target_warm_reset_async(struct iscsi_context *iscsi,
iscsi_command_cb cb, void *private_data);
EXTERN int
iscsi_task_mgmt_target_cold_reset_async(struct iscsi_context *iscsi,
iscsi_command_cb cb, void *private_data);
/* These are the possible status values for the callbacks for scsi commands.
* The content of command_data depends on the status type.
*
* status :
* ISCSI_STATUS_GOOD the scsi command completed successfullt on the target.
* If this scsi command returns DATA-IN, that data is stored in an scsi_task
* structure returned in the command_data parameter. This buffer will be
* automatically freed once the callback returns.
*
* ISCSI_STATUS_CHECK_CONDITION the scsi command failed with a scsi sense.
* Command_data contains a struct scsi_task. When the callback returns,
* this buffer will automatically become freed.
*
* ISCSI_STATUS_CANCELLED the scsi command was aborted. Command_data is
* NULL.
*
* ISCSI_STATUS_ERROR the command failed. Command_data is NULL.
*/
struct iscsi_data {
int size;
size_t alloc_size;
unsigned char *data;
};
/*
* These functions will set the ISID type and value.
* By default, contexts will automatically be assigned a 'random'
* type and value on creation, but this can be overridden
* by an appplication using these functions.
*
* Setting the ISID can only be done before loggin in to the target.
*/
EXTERN int
iscsi_set_isid_oui(struct iscsi_context *iscsi, uint32_t oui, uint32_t qualifier);
EXTERN int
iscsi_set_isid_en(struct iscsi_context *iscsi, uint32_t en, uint32_t qualifier);
EXTERN int
iscsi_set_isid_random(struct iscsi_context *iscsi, uint32_t rnd, uint32_t qualifier);
EXTERN int
iscsi_set_isid_reserved(struct iscsi_context *iscsi);
/*
* The scsi commands use/return a scsi_task structure when invoked
* and also through the callback.
*
* You must release this structure when you are finished with the task
* by calling scsi_free_scsi_task().
* Most of the time this means you should call this function before returning
* from the callback.
*/
EXTERN int iscsi_scsi_command_async(struct iscsi_context *iscsi, int lun,
struct scsi_task *task, iscsi_command_cb cb,
struct iscsi_data *data, void *private_data);
/*
* Async commands for SCSI
*
* These async functions return a scsi_task structure, or NULL if the command failed.
* This structure can be used by task management functions to abort the task or a whole task set.
*/
EXTERN struct scsi_task *
iscsi_reportluns_task(struct iscsi_context *iscsi, int report_type,
int alloc_len, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_testunitready_task(struct iscsi_context *iscsi, int lun,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_inquiry_task(struct iscsi_context *iscsi, int lun, int evpd,
int page_code, int maxsize, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_readcapacity10_task(struct iscsi_context *iscsi, int lun, int lba,
int pmi, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_readcapacity16_task(struct iscsi_context *iscsi, int lun,
iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_get_lba_status_task(struct iscsi_context *iscsi, int lun,
uint64_t starting_lba, uint32_t alloc_len,
iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_synchronizecache10_task(struct iscsi_context *iscsi, int lun,
int lba, int num_blocks, int syncnv,
int immed, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_synchronizecache16_task(struct iscsi_context *iscsi, int lun,
uint64_t lba, uint32_t num_blocks, int syncnv,
int immed, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_prefetch10_task(struct iscsi_context *iscsi, int lun,
uint32_t lba, int num_blocks,
int immed, int group,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_prefetch16_task(struct iscsi_context *iscsi, int lun,
uint64_t lba, int num_blocks,
int immed, int group,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_read6_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
uint32_t datalen, int blocksize, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_read10_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
uint32_t datalen, int blocksize,
int rdprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_write10_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_writeverify10_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int bytchk, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_read12_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
uint32_t datalen, int blocksize,
int rdprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_write12_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_writeverify12_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int bytchk, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_read16_task(struct iscsi_context *iscsi, int lun, uint64_t lba,
uint32_t datalen, int blocksize,
int rdprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_write16_task(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_orwrite_task(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_startstopunit_task(struct iscsi_context *iscsi, int lun,
int immed, int pcm, int pc,
int no_flush, int loej, int start,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_preventallow_task(struct iscsi_context *iscsi, int lun,
int prevent,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_compareandwrite_task(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_writeverify16_task(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int bytchk, int group_number,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_verify10_task(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen, uint32_t lba,
int vprotect, int dpo, int bytchk,
int blocksize, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_verify12_task(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen, uint32_t lba,
int vprotect, int dpo, int bytchk,
int blocksize, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_verify16_task(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen, uint64_t lba,
int vprotect, int dpo, int bytchk,
int blocksize, iscsi_command_cb cb,
void *private_data);
EXTERN struct scsi_task *
iscsi_writesame10_task(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen,
uint32_t lba, uint16_t num_blocks,
int anchor, int unmap, int pbdata, int lbdata,
int wrprotect, int group,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_writesame16_task(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen,
uint64_t lba, uint32_t num_blocks,
int anchor, int unmap, int pbdata, int lbdata,
int wrprotect, int group,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_modesense6_task(struct iscsi_context *iscsi, int lun, int dbd,
int pc, int page_code, int sub_page_code,
unsigned char alloc_len, iscsi_command_cb cb,
void *private_data);
struct unmap_list {
uint64_t lba;
uint32_t num;
};
EXTERN struct scsi_task *
iscsi_unmap_task(struct iscsi_context *iscsi, int lun, int anchor, int group,
struct unmap_list *list, int list_len,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_readtoc_task(struct iscsi_context *iscsi, int lun, int msf, int format,
int track_session, int maxsize,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_reserve6_task(struct iscsi_context *iscsi, int lun,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_release6_task(struct iscsi_context *iscsi, int lun,
iscsi_command_cb cb, void *private_data);
EXTERN struct scsi_task *
iscsi_report_supported_opcodes_task(struct iscsi_context *iscsi, int lun,
int return_timeouts, int maxsize,
iscsi_command_cb cb, void *private_data);
/*
* Sync commands for SCSI
*/
EXTERN struct scsi_task *
iscsi_scsi_command_sync(struct iscsi_context *iscsi, int lun,
struct scsi_task *task, struct iscsi_data *data);
EXTERN struct scsi_task *
iscsi_modesense6_sync(struct iscsi_context *iscsi, int lun, int dbd,
int pc, int page_code, int sub_page_code,
unsigned char alloc_len);
EXTERN struct scsi_task *
iscsi_reportluns_sync(struct iscsi_context *iscsi, int report_type,
int alloc_len);
EXTERN struct scsi_task *
iscsi_testunitready_sync(struct iscsi_context *iscsi, int lun);
EXTERN struct scsi_task *
iscsi_inquiry_sync(struct iscsi_context *iscsi, int lun, int evpd,
int page_code, int maxsize);
EXTERN struct scsi_task *
iscsi_read6_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
uint32_t datalen, int blocksize);
EXTERN struct scsi_task *
iscsi_read10_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
uint32_t datalen, int blocksize,
int rdprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_write10_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_writeverify10_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int bytchk, int group_number);
EXTERN struct scsi_task *
iscsi_read12_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
uint32_t datalen, int blocksize,
int rdprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_write12_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_writeverify12_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int bytchk, int group_number);
EXTERN struct scsi_task *
iscsi_read16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
uint32_t datalen, int blocksize,
int rdprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_write16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_orwrite_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_startstopunit_sync(struct iscsi_context *iscsi, int lun,
int immed, int pcm, int pc,
int no_flush, int loej, int start);
EXTERN struct scsi_task *
iscsi_preventallow_sync(struct iscsi_context *iscsi, int lun,
int prevent);
EXTERN struct scsi_task *
iscsi_compareandwrite_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int fua, int fua_nv, int group_number);
EXTERN struct scsi_task *
iscsi_writeverify16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
unsigned char *data, uint32_t datalen, int blocksize,
int wrprotect, int dpo, int bytchk, int group_number);
EXTERN struct scsi_task *
iscsi_readcapacity10_sync(struct iscsi_context *iscsi, int lun, int lba,
int pmi);
EXTERN struct scsi_task *
iscsi_readcapacity16_sync(struct iscsi_context *iscsi, int lun);
EXTERN struct scsi_task *
iscsi_get_lba_status_sync(struct iscsi_context *iscsi, int lun, uint64_t starting_lba, uint32_t alloc_len);
EXTERN struct scsi_task *
iscsi_synchronizecache10_sync(struct iscsi_context *iscsi, int lun, int lba,
int num_blocks, int syncnv, int immed);
EXTERN struct scsi_task *
iscsi_synchronizecache16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
uint32_t num_blocks, int syncnv, int immed);
EXTERN struct scsi_task *
iscsi_prefetch10_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
int num_blocks, int immed, int group);
EXTERN struct scsi_task *
iscsi_prefetch16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
int num_blocks, int immed, int group);
EXTERN struct scsi_task *
iscsi_verify10_sync(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen, uint32_t lba,
int vprotect, int dpo, int bytchk,
int blocksize);
EXTERN struct scsi_task *
iscsi_verify12_sync(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen, uint32_t lba,
int vprotect, int dpo, int bytchk,
int blocksize);
EXTERN struct scsi_task *
iscsi_verify16_sync(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen, uint64_t lba,
int vprotect, int dpo, int bytchk,
int blocksize);
EXTERN struct scsi_task *
iscsi_writesame10_sync(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen,
uint32_t lba, uint16_t num_blocks,
int anchor, int unmap, int pbdata, int lbdata,
int wrprotect, int group);
EXTERN struct scsi_task *
iscsi_writesame16_sync(struct iscsi_context *iscsi, int lun,
unsigned char *data, uint32_t datalen,
uint64_t lba, uint32_t num_blocks,
int anchor, int unmap, int pbdata, int lbdata,
int wrprotect, int group);
EXTERN struct scsi_task *
iscsi_unmap_sync(struct iscsi_context *iscsi, int lun, int anchor, int group,
struct unmap_list *list, int list_len);
EXTERN struct scsi_task *
iscsi_readtoc_sync(struct iscsi_context *iscsi, int lun, int msf,
int format, int track_session, int maxsize);
EXTERN struct scsi_task *
iscsi_reserve6_sync(struct iscsi_context *iscsi, int lun);
EXTERN struct scsi_task *
iscsi_release6_sync(struct iscsi_context *iscsi, int lun);
EXTERN struct scsi_task *
iscsi_report_supported_opcodes_sync(struct iscsi_context *iscsi, int lun,
int return_timeouts, int maxsize);
/*
* This function is used when the application wants to specify its own buffers to read the data
* from the DATA-IN PDUs into.
* The main use is for SCSI read operations to have them write directly into the application buffers to
* avoid the two copies that would occur otherwise.
* First copy from the individual DATA-IN blobs to linearize the buffer and the second in the callback
* to copy the data from the linearized buffer into the application buffer.
*
* This also supports reading into a vector of buffers by calling this function multiple times.
* The individual buffers will be filled in the same order as they were created.
*
* Example:
* task = iscsi_read10_task( ( 2 512byte blocks into two buffers)
* scsi_task_add_data_in_buffer(task, first_buffer, 512
* scsi_task_add_data_in_buffer(task, second_buffer, 512
*
*
* If you use this function you can not use task->datain in the callback.
* task->datain.size will be 0 and
* task->datain.data will be NULL
*/
EXTERN int scsi_task_add_data_in_buffer(struct scsi_task *task, int len, unsigned char *buf);
/*
* This function is used when you want to cancel a scsi task.
* The callback for the task will immediately be invoked with SCSI_STATUS_CANCELLED.
* The cancellation is only local in libiscsi. If the task is already in-flight
* this call will not cancel the task at the target.
* To cancel the task also a the target you need to call the task management functions.
*/
EXTERN int
iscsi_scsi_cancel_task(struct iscsi_context *iscsi,
struct scsi_task *task);
/*
* This function is used when you want to cancel all scsi tasks.
* The callback for the tasks will immediately be invoked with SCSI_STATUS_CANCELLED.
* The cancellation is only local in libiscsi. If the tasks are already in-flight
* this call will not cancel the tasks at the target.
* To cancel the tasks also a the target you need to call the task management functions.
*/
EXTERN void
iscsi_scsi_cancel_all_tasks(struct iscsi_context *iscsi);
/*
* This function is to set the debugging level where level is
*
* 0 = disabled (default)
* 1 = errors only
* 2 = connection related info
* 3 = user set variables
* 4 = function calls
* 5 = ...
* 10 = everything
*/
EXTERN void
iscsi_set_log_level(struct iscsi_context *iscsi, int level);
typedef void (*iscsi_log_fn)(int level, const char *mesage);
/* Set the logging function to use */
EXTERN void iscsi_set_log_fn(struct iscsi_context *iscsi, iscsi_log_fn fn);
/* predefined log function that just writes to stderr */
EXTERN void iscsi_log_to_stderr(int level, const char *message);
/*
* This function is to set the TCP_USER_TIMEOUT option. It has to be called after iscsi
* context creation. The value given in ms is then applied each time a new socket is created.
*/
EXTERN void
iscsi_set_tcp_user_timeout(struct iscsi_context *iscsi, int timeout_ms);
/*
* This function is to set the TCP_KEEPIDLE option. It has to be called after iscsi
* context creation.
*/
EXTERN void
iscsi_set_tcp_keepidle(struct iscsi_context *iscsi, int value);
/*
* This function is to set the TCP_KEEPCNT option. It has to be called after iscsi
* context creation.
*/
EXTERN void
iscsi_set_tcp_keepcnt(struct iscsi_context *iscsi, int value);
/*
* This function is to set the TCP_KEEPINTVL option. It has to be called after iscsi
* context creation.
*/
EXTERN void
iscsi_set_tcp_keepintvl(struct iscsi_context *iscsi, int value);
/*
* This function is to set the TCP_SYNCNT option. It has to be called after iscsi
* context creation.
*/
EXTERN void
iscsi_set_tcp_syncnt(struct iscsi_context *iscsi, int value);
/*
* This function is to set the interface that outbound connections for this socket are bound to.
* You max specify more than one interface here separated by comma.
*/
EXTERN void
iscsi_set_bind_interfaces(struct iscsi_context *iscsi, char * interfaces);
#ifdef __cplusplus
}
#endif
#endif /* __iscsi_h__ */
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