3a39201543
It is not real zero-copy since the data is still copied in the kernel, but it avoids copying the data inside libiscsi as well as in the callback. For SCSI tasks that will return data from the target, the application can now specify application buffers for libiscsi to read the data directly into. This is done by calling scsi_task_add_data_in_buffer(task, ... These buffers need not be linear, you can specify different areas to read into by calling this function several times. See examples/iscsiclient.c for an example.
655 lines
21 KiB
C
655 lines
21 KiB
C
/*
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Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __iscsi_h__
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#define __iscsi_h__
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#include <stdint.h>
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struct iscsi_context;
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struct sockaddr;
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/*
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* Syntax for normal and portal/discovery URLs.
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*/
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#define ISCSI_URL_SYNTAX "\"iscsi://[<username>[%<password>]@]" \
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"<host>[:<port>]/<target-iqn>/<lun>\""
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#define ISCSI_PORTAL_URL_SYNTAX "\"iscsi://[<username>[%<password>]@]" \
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"<host>[:<port>]\""
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/*
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* The following three functions are used to integrate libiscsi in an event
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* system.
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*/
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/*
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* Returns the file descriptor that libiscsi uses.
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*/
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int iscsi_get_fd(struct iscsi_context *iscsi);
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/*
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* Returns which events that we need to poll for for the iscsi file descriptor.
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*/
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int iscsi_which_events(struct iscsi_context *iscsi);
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/*
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* Called to process the events when events become available for the iscsi
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* file descriptor.
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*/
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int iscsi_service(struct iscsi_context *iscsi, int revents);
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/*
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* How many commands are in flight.
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*/
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int iscsi_queue_length(struct iscsi_context *iscsi);
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/*
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* To set tcp keepalive for the session
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* ONLY available on platforms with tcp keepalive socket options
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*/
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int iscsi_set_tcp_keepalive(struct iscsi_context *iscsi, int idle, int count, int interval);
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struct iscsi_url {
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const char *portal;
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const char *target;
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const char *user;
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const char *passwd;
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int lun;
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};
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/*
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* This function is used to parse an iSCSI URL into a iscsi_url structure.
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* iSCSI URL format :
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* iscsi://[<username>[%<password>]@]<host>[:<port>]/<target-iqn>/<lun>
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*
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* Function will return a pointer to an iscsi url structure if successful,
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* or it will return NULL and set iscsi_get_error() accrodingly if there was a problem
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* with the URL.
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*
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* CHAP username/password can also be provided via environment variables
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* LIBISCSI_CHAP_USERNAME=ronnie
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* LIBISCSI_CHAP_PASSWORD=password
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*
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* The returned structure is freed by calling iscsi_destroy_url()
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*/
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struct iscsi_url *iscsi_parse_full_url(struct iscsi_context *iscsi, const char *url);
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void iscsi_destroy_url(struct iscsi_url *iscsi_url);
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/*
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* This function is used to parse an iSCSI Portal URL into a iscsi_url structure.
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* iSCSI Portal URL format :
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* iscsi://[<username>[%<password>]@]<host>[:<port>]
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*
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* iSCSI Portal URL is used when describing a discovery session, where the target-iqn and the
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* lun is not yet known.
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*
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* Function will return a pointer to an iscsi url structure if successful,
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* or it will return NULL and set iscsi_get_error() accrodingly if there was a problem
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* with the URL.
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*
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* CHAP username/password can also be provided via environment variables
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* LIBISCSI_CHAP_USERNAME=ronnie
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* LIBISCSI_CHAP_PASSWORD=password
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*
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* The returned structure is freed by calling iscsi_destroy_url()
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*/
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struct iscsi_url *
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iscsi_parse_portal_url(struct iscsi_context *iscsi, const char *url);
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/*
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* This function returns a description of the last encountered error.
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*/
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const char *iscsi_get_error(struct iscsi_context *iscsi);
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/*
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* Create a context for an ISCSI session.
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* Initiator_name is the iqn name we want to identify to the target as.
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*
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* Returns:
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* 0: success
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* <0: error
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*/
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struct iscsi_context *iscsi_create_context(const char *initiator_name);
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/*
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* Destroy an existing ISCSI context and tear down any existing connection.
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* Callbacks for any command in flight will be invoked with
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* ISCSI_STATUS_CANCELLED.
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*
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* Returns:
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* 0: success
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* <0: error
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*/
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int iscsi_destroy_context(struct iscsi_context *iscsi);
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/*
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* Set an optional alias name to identify with when connecting to the target
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*
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* Returns:
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* 0: success
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* <0: error
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*/
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int iscsi_set_alias(struct iscsi_context *iscsi, const char *alias);
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/*
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* Set the iqn name of the taqget to login to.
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* The target name must be set before a normal-login can be initiated.
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* Only discovery-logins are possible without setting the target iqn name.
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*
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* Returns:
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* 0: success
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* <0: error
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*/
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int iscsi_set_targetname(struct iscsi_context *iscsi, const char *targetname);
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/*
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* This function returns any target address supplied in a login response when
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* the target has moved.
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*/
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const char *iscsi_get_target_address(struct iscsi_context *iscsi);
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/* Type of iscsi sessions. Discovery sessions are used to query for what
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* targets exist behind the portal connected to. Normal sessions are used to
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* log in and do I/O to the SCSI LUNs
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*/
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enum iscsi_session_type {
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ISCSI_SESSION_DISCOVERY = 1,
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ISCSI_SESSION_NORMAL = 2
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};
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/*
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* Set the session type for a scsi context.
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* Session type can only be set/changed before the context
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* is logged in to the target.
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*
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* Returns:
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* 0: success
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* <0: error
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*/
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int iscsi_set_session_type(struct iscsi_context *iscsi,
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enum iscsi_session_type session_type);
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/*
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* Types of header digest we support. Default is NONE
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*/
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enum iscsi_header_digest {
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ISCSI_HEADER_DIGEST_NONE = 0,
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ISCSI_HEADER_DIGEST_NONE_CRC32C = 1,
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ISCSI_HEADER_DIGEST_CRC32C_NONE = 2,
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ISCSI_HEADER_DIGEST_CRC32C = 3
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};
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/*
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* Set the desired header digest for a scsi context.
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* Header digest can only be set/changed before the context
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* is logged in to the target.
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*
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* Returns:
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* 0: success
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* <0: error
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*/
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int iscsi_set_header_digest(struct iscsi_context *iscsi,
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enum iscsi_header_digest header_digest);
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/*
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* Specify the username and password to use for chap authentication
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*/
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int iscsi_set_initiator_username_pwd(struct iscsi_context *iscsi,
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const char *user,
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const char *passwd);
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/*
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* check if the context is logged in or not
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*/
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int iscsi_is_logged_in(struct iscsi_context *iscsi);
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enum scsi_status {
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SCSI_STATUS_GOOD = 0,
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SCSI_STATUS_CHECK_CONDITION = 2,
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SCSI_STATUS_RESERVATION_CONFLICT = 0x18,
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SCSI_STATUS_CANCELLED = 0x0f000000,
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SCSI_STATUS_ERROR = 0x0f000001
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};
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/*
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* Generic callback for completion of iscsi_*_async().
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* command_data depends on status.
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*/
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typedef void (*iscsi_command_cb)(struct iscsi_context *iscsi, int status,
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void *command_data, void *private_data);
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/*
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* Asynchronous call to connect a TCP connection to the target-host/port
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*
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* Returns:
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* 0 if the call was initiated and a connection will be attempted. Result of
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* the connection will be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* This command is unique in that the callback can be invoked twice.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : Connection was successful. Command_data is NULL.
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* In this case the callback will be invoked a
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* second time once the connection is torn down.
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*
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* ISCSI_STATUS_ERROR : Either failed to establish the connection, or
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* an already established connection has failed
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* with an error.
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*
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* The callback will NOT be invoked if the session is explicitely torn down
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* through a call to iscsi_disconnect() or iscsi_destroy_context().
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*/
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int iscsi_connect_async(struct iscsi_context *iscsi, const char *portal,
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iscsi_command_cb cb, void *private_data);
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/*
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* Synchronous call to connect a TCP connection to the target-host/port
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*
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* Returns:
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* 0 if connected successfully.
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* <0 if there was an error.
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*
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*/
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int iscsi_connect_sync(struct iscsi_context *iscsi, const char *portal);
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/*
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* Asynchronous call to connect a lun
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* This function will connect to the portal, login, and verify that the lun
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* is available.
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*
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* Returns:
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* 0 if the call was initiated and a connection will be attempted. Result
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* of the connection will be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* This command is unique in that the callback can be invoked twice.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : Connection was successful. Command_data is NULL.
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* In this case the callback will be invoked a
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* second time once the connection is torn down.
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*
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* ISCSI_STATUS_ERROR : Either failed to establish the connection, or
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* an already established connection has failed
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* with an error.
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*
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* The callback will NOT be invoked if the session is explicitely torn down
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* through a call to iscsi_disconnect() or iscsi_destroy_context().
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*/
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int iscsi_full_connect_async(struct iscsi_context *iscsi, const char *portal,
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int lun, iscsi_command_cb cb, void *private_data);
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/*
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* Synchronous call to connect a lun
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* This function will connect to the portal, login, and verify that the lun
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* is available.
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*
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* Returns:
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* 0 if the cconnect was successful.
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* <0 if there was an error.
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*/
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int iscsi_full_connect_sync(struct iscsi_context *iscsi, const char *portal,
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int lun);
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/*
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* Disconnect a connection to a target.
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* You can not disconnect while being logged in to a target.
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*
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* Returns:
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* 0 disconnect was successful
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* <0 error
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*/
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int iscsi_disconnect(struct iscsi_context *iscsi);
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/*
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* Asynchronous call to perform an ISCSI login.
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*
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* Returns:
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* 0 if the call was initiated and a login will be attempted. Result of the
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* login will be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : login was successful. Command_data is always
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* NULL.
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* ISCSI_STATUS_CANCELLED: login was aborted. Command_data is NULL.
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* ISCSI_STATUS_ERROR : login failed. Command_data is NULL.
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*/
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int iscsi_login_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
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void *private_data);
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/*
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* Synchronous call to perform an ISCSI login.
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*
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* Returns:
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* 0 if the login was successful
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* <0 if there was an error.
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*/
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int iscsi_login_sync(struct iscsi_context *iscsi);
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/*
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* Asynchronous call to perform an ISCSI logout.
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*
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* Returns:
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* 0 if the call was initiated and a logout will be attempted. Result of the
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* logout will be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : logout was successful. Command_data is always
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* NULL.
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* ISCSI_STATUS_CANCELLED: logout was aborted. Command_data is NULL.
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*/
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int iscsi_logout_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
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void *private_data);
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/*
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* Synchronous call to perform an ISCSI logout.
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*
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* Returns:
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* 0 if the logout was successful
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* <0 if there was an error.
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*/
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int iscsi_logout_sync(struct iscsi_context *iscsi);
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/*
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* Asynchronous call to perform an ISCSI discovery.
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*
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* discoveries can only be done on connected and logged in discovery sessions.
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*
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* Returns:
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* 0 if the call was initiated and a discovery will be attempted. Result
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* of the logout will be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : Discovery was successful. Command_data is a
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* pointer to a iscsi_discovery_address list of
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* structures.
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* This list of structures is only valid for the
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* duration of the callback and all data will be
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* freed once the callback returns.
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* ISCSI_STATUS_CANCELLED: Discovery was aborted. Command_data is NULL.
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*/
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int iscsi_discovery_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
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void *private_data);
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struct iscsi_discovery_address {
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struct iscsi_discovery_address *next;
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const char *target_name;
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const char *target_address;
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};
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/*
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* Asynchronous call to perform an ISCSI NOP-OUT call
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*
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* Returns:
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* 0 if the call was initiated and a nop-out will be attempted. Result will
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* be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : NOP-OUT was successful and the server responded
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* with a NOP-IN callback_data is a iscsi_data
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* structure containing the data returned from
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* the server.
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* ISCSI_STATUS_CANCELLED: Discovery was aborted. Command_data is NULL.
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*/
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int iscsi_nop_out_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
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unsigned char *data, int len, void *private_data);
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struct scsi_task;
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enum iscsi_task_mgmt_funcs {
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ISCSI_TM_ABORT_TASK = 0x01,
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ISCSI_TM_ABORT_TASK_SET = 0x02,
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ISCSI_TM_CLEAR_ACA = 0x03,
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ISCSI_TM_CLEAR_TASK_SET = 0x04,
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ISCSI_TM_LUN_RESET = 0x05,
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ISCSI_TM_TARGET_WARM_RESET = 0x06,
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ISCSI_TM_TARGET_COLD_RESET = 0x07,
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ISCSI_TM_TASK_REASSIGN = 0x08
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};
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/*
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* Asynchronous call for task management
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*
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* Returns:
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* 0 if the call was initiated and the task mgmt function will be invoked.
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* the connection will be reported through the callback function.
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* <0 if there was an error. The callback function will not be invoked.
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*
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* Callback parameters :
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* status can be either of :
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* ISCSI_STATUS_GOOD : Connection was successful. Command_data is a pointer to uint32_t
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* containing the response code as per RFC3720/10.6.1
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*
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* ISCSI_STATUS_ERROR : Error.
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*
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* The callback will NOT be invoked if the session is explicitely torn down
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* through a call to iscsi_disconnect() or iscsi_destroy_context().
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*/
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int
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iscsi_task_mgmt_async(struct iscsi_context *iscsi,
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int lun, enum iscsi_task_mgmt_funcs function,
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uint32_t ritt, uint32_t rcmdscn,
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iscsi_command_cb cb, void *private_data);
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int
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iscsi_task_mgmt_abort_task_async(struct iscsi_context *iscsi,
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struct scsi_task *task,
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iscsi_command_cb cb, void *private_data);
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int
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iscsi_task_mgmt_abort_task_set_async(struct iscsi_context *iscsi,
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uint32_t lun,
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iscsi_command_cb cb, void *private_data);
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int
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iscsi_task_mgmt_lun_reset_async(struct iscsi_context *iscsi,
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uint32_t lun,
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iscsi_command_cb cb, void *private_data);
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int
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iscsi_task_mgmt_target_warm_reset_async(struct iscsi_context *iscsi,
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iscsi_command_cb cb, void *private_data);
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int
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iscsi_task_mgmt_target_cold_reset_async(struct iscsi_context *iscsi,
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iscsi_command_cb cb, void *private_data);
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/* These are the possible status values for the callbacks for scsi commands.
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* The content of command_data depends on the status type.
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*
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* status :
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* ISCSI_STATUS_GOOD the scsi command completed successfullt on the target.
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* If this scsi command returns DATA-IN, that data is stored in an scsi_task
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* structure returned in the command_data parameter. This buffer will be
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* automatically freed once the callback returns.
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*
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* ISCSI_STATUS_CHECK_CONDITION the scsi command failed with a scsi sense.
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* 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;
|
|
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.
|
|
*/
|
|
int
|
|
iscsi_set_isid_oui(struct iscsi_context *iscsi, uint32_t oui, uint32_t qualifier);
|
|
int
|
|
iscsi_set_isid_en(struct iscsi_context *iscsi, uint32_t en, uint32_t qualifier);
|
|
int
|
|
iscsi_set_isid_random(struct iscsi_context *iscsi, uint32_t rnd, uint32_t qualifier);
|
|
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.
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
struct scsi_task *
|
|
iscsi_reportluns_task(struct iscsi_context *iscsi, int report_type,
|
|
int alloc_len, iscsi_command_cb cb,
|
|
void *private_data);
|
|
struct scsi_task *
|
|
iscsi_testunitready_task(struct iscsi_context *iscsi, int lun,
|
|
iscsi_command_cb cb, void *private_data);
|
|
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);
|
|
struct scsi_task *
|
|
iscsi_readcapacity10_task(struct iscsi_context *iscsi, int lun, int lba,
|
|
int pmi, iscsi_command_cb cb,
|
|
void *private_data);
|
|
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);
|
|
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);
|
|
|
|
struct scsi_task *
|
|
iscsi_read10_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
|
|
uint32_t datalen, int blocksize, iscsi_command_cb cb,
|
|
void *private_data);
|
|
struct scsi_task *
|
|
iscsi_write10_task(struct iscsi_context *iscsi, int lun,
|
|
unsigned char *data, uint32_t datalen, uint32_t lba, int fua,
|
|
int fuanv, int blocksize, iscsi_command_cb cb,
|
|
void *private_data);
|
|
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);
|
|
|
|
|
|
/*
|
|
* Sync commands for SCSI
|
|
*/
|
|
struct scsi_task *
|
|
iscsi_scsi_command_sync(struct iscsi_context *iscsi, int lun,
|
|
struct scsi_task *task, struct iscsi_data *data);
|
|
|
|
struct scsi_task *
|
|
iscsi_reportluns_sync(struct iscsi_context *iscsi, int report_type,
|
|
int alloc_len);
|
|
|
|
struct scsi_task *
|
|
iscsi_testunitready_sync(struct iscsi_context *iscsi, int lun);
|
|
|
|
struct scsi_task *
|
|
iscsi_inquiry_sync(struct iscsi_context *iscsi, int lun, int evpd,
|
|
int page_code, int maxsize);
|
|
|
|
struct scsi_task *
|
|
iscsi_read6_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
|
|
uint32_t datalen, int blocksize);
|
|
|
|
struct scsi_task *
|
|
iscsi_read10_sync(struct iscsi_context *iscsi, int lun, uint32_t lba,
|
|
uint32_t datalen, int blocksize);
|
|
|
|
struct scsi_task *
|
|
iscsi_readcapacity10_sync(struct iscsi_context *iscsi, int lun, int lba,
|
|
int pmi);
|
|
|
|
struct scsi_task *
|
|
iscsi_synchronizecache10_sync(struct iscsi_context *iscsi, int lun, int lba,
|
|
int num_blocks, int syncnv, int immed);
|
|
|
|
|
|
/*
|
|
* 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_buffer(task, first_buffer, 512
|
|
* scsi_task_add_data_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
|
|
*/
|
|
int scsi_task_add_data_in_buffer(struct scsi_task *task, int len, unsigned char *buf);
|
|
|
|
|
|
#endif /* __iscsi_h__ */
|