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freebsd-skq/sys/dev/iscsi/iscsi_ioctl.h
np 2e36f0c10a Make the iSCSI parameter negotiation more flexible. 
Decouple the send and receive limits on the amount of data in a single
iSCSI PDU.  MaxRecvDataSegmentLength is declarative, not negotiated, and
is direction-specific so there is no reason for both ends to limit
themselves to the same min(initiator, target) value in both directions.

Allow iSCSI drivers to report their send, receive, first burst, and max
burst limits explicitly instead of using hardcoded values or trying to
derive all of them from the receive limit (which was the only limit
reported by the drivers prior to this change).

Display the send and receive limits separately in the userspace iSCSI
utilities.

Reviewed by:	jpaetzel@ (earlier version), trasz@
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D7279
2016-08-25 05:22:53 +00:00

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/*-
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef ISCSI_IOCTL_H
#define ISCSI_IOCTL_H
#ifdef ICL_KERNEL_PROXY
#include <sys/socket.h>
#endif
#define ISCSI_PATH "/dev/iscsi"
#define ISCSI_MAX_DATA_SEGMENT_LENGTH (128 * 1024)
#define ISCSI_NAME_LEN 224 /* 223 bytes, by RFC 3720, + '\0' */
#define ISCSI_ADDR_LEN 47 /* INET6_ADDRSTRLEN + '\0' */
#define ISCSI_ALIAS_LEN 256 /* XXX: Where did it come from? */
#define ISCSI_SECRET_LEN 17 /* 16 + '\0' */
#define ISCSI_OFFLOAD_LEN 8
#define ISCSI_REASON_LEN 64
#define ISCSI_DIGEST_NONE 0
#define ISCSI_DIGEST_CRC32C 1
/*
* Session configuration, set when adding the session.
*/
struct iscsi_session_conf {
char isc_initiator[ISCSI_NAME_LEN];
char isc_initiator_addr[ISCSI_ADDR_LEN];
char isc_initiator_alias[ISCSI_ALIAS_LEN];
char isc_target[ISCSI_NAME_LEN];
char isc_target_addr[ISCSI_ADDR_LEN];
char isc_user[ISCSI_NAME_LEN];
char isc_secret[ISCSI_SECRET_LEN];
char isc_mutual_user[ISCSI_NAME_LEN];
char isc_mutual_secret[ISCSI_SECRET_LEN];
int isc_discovery;
int isc_header_digest;
int isc_data_digest;
int isc_iser;
char isc_offload[ISCSI_OFFLOAD_LEN];
int isc_enable;
int isc_spare[4];
};
/*
* Additional constraints imposed by chosen ICL offload module;
* iscsid(8) must obey those when negotiating operational parameters.
*/
struct iscsi_session_limits {
size_t isl_spare0;
int isl_max_recv_data_segment_length;
int isl_max_send_data_segment_length;
int isl_max_burst_length;
int isl_first_burst_length;
int isl_spare[4];
};
/*
* Session state, negotiated by iscsid(8) and queried by iscsictl(8).
*/
struct iscsi_session_state {
struct iscsi_session_conf iss_conf;
unsigned int iss_id;
char iss_target_alias[ISCSI_ALIAS_LEN];
int iss_header_digest;
int iss_data_digest;
int iss_max_recv_data_segment_length;
int iss_max_burst_length;
int iss_first_burst_length;
int iss_immediate_data;
int iss_connected;
char iss_reason[ISCSI_REASON_LEN];
char iss_offload[ISCSI_OFFLOAD_LEN];
int iss_max_send_data_segment_length;
int iss_spare[3];
};
/*
* The following ioctls are used by iscsid(8).
*/
struct iscsi_daemon_request {
unsigned int idr_session_id;
struct iscsi_session_conf idr_conf;
uint8_t idr_isid[6];
uint16_t idr_tsih;
uint16_t idr_spare_cid;
struct iscsi_session_limits idr_limits;
int idr_spare[4];
};
struct iscsi_daemon_handoff {
unsigned int idh_session_id;
int idh_socket;
char idh_target_alias[ISCSI_ALIAS_LEN];
uint8_t idh_spare_isid[6];
uint16_t idh_tsih;
uint16_t idh_spare_cid;
uint32_t idh_statsn;
int idh_header_digest;
int idh_data_digest;
size_t spare[3];
int idh_immediate_data;
int idh_initial_r2t;
int idh_max_recv_data_segment_length;
int idh_max_send_data_segment_length;
int idh_max_burst_length;
int idh_first_burst_length;
};
struct iscsi_daemon_fail {
unsigned int idf_session_id;
char idf_reason[ISCSI_REASON_LEN];
int idf_spare[4];
};
#define ISCSIDWAIT _IOR('I', 0x01, struct iscsi_daemon_request)
#define ISCSIDHANDOFF _IOW('I', 0x02, struct iscsi_daemon_handoff)
#define ISCSIDFAIL _IOW('I', 0x03, struct iscsi_daemon_fail)
#ifdef ICL_KERNEL_PROXY
/*
* When ICL_KERNEL_PROXY is not defined, the iscsid(8) is responsible
* for creating the socket, connecting, and performing Login Phase using
* the socket in the usual userspace way, and then passing the socket
* file descriptor to the kernel part using ISCSIDHANDOFF.
*
* When ICL_KERNEL_PROXY is defined, the iscsid(8) creates the session
* using ISCSICONNECT, performs Login Phase using ISCSISEND/ISCSIRECEIVE
* instead of read(2)/write(2), and then calls ISCSIDHANDOFF with
* idh_socket set to 0.
*
* The purpose of ICL_KERNEL_PROXY is to workaround the fact that,
* at this time, it's not possible to do iWARP (RDMA) in userspace.
*/
struct iscsi_daemon_connect {
unsigned int idc_session_id;
int idc_iser;
int idc_domain;
int idc_socktype;
int idc_protocol;
struct sockaddr *idc_from_addr;
socklen_t idc_from_addrlen;
struct sockaddr *idc_to_addr;
socklen_t idc_to_addrlen;
int idc_spare[4];
};
struct iscsi_daemon_send {
unsigned int ids_session_id;
void *ids_bhs;
size_t ids_spare;
void *ids_spare2;
size_t ids_data_segment_len;
void *ids_data_segment;
int ids_spare3[4];
};
struct iscsi_daemon_receive {
unsigned int idr_session_id;
void *idr_bhs;
size_t idr_spare;
void *idr_spare2;
size_t idr_data_segment_len;
void *idr_data_segment;
int idr_spare3[4];
};
#define ISCSIDCONNECT _IOWR('I', 0x04, struct iscsi_daemon_connect)
#define ISCSIDSEND _IOWR('I', 0x05, struct iscsi_daemon_send)
#define ISCSIDRECEIVE _IOWR('I', 0x06, struct iscsi_daemon_receive)
#endif /* ICL_KERNEL_PROXY */
/*
* The following ioctls are used by iscsictl(8).
*/
struct iscsi_session_add {
struct iscsi_session_conf isa_conf;
int isa_spare[4];
};
struct iscsi_session_remove {
unsigned int isr_session_id;
struct iscsi_session_conf isr_conf;
int isr_spare[4];
};
struct iscsi_session_list {
unsigned int isl_nentries;
struct iscsi_session_state *isl_pstates;
int isl_spare[4];
};
struct iscsi_session_modify {
unsigned int ism_session_id;
struct iscsi_session_conf ism_conf;
int ism_spare[4];
};
#define ISCSISADD _IOW('I', 0x11, struct iscsi_session_add)
#define ISCSISREMOVE _IOW('I', 0x12, struct iscsi_session_remove)
#define ISCSISLIST _IOWR('I', 0x13, struct iscsi_session_list)
#define ISCSISMODIFY _IOWR('I', 0x14, struct iscsi_session_modify)
#endif /* !ISCSI_IOCTL_H */
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