82babffba9
initiator iSCSI offload. Pass maximum data segment size supported by chosen offload module to iscsid(8), and make iscsid(8) not try to negotiate anything larger than that. MFC after: 1 month Sponsored by: The FreeBSD Foundation
227 lines
6.6 KiB
C
227 lines
6.6 KiB
C
/*-
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef ISCSI_IOCTL_H
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#define ISCSI_IOCTL_H
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#ifdef ICL_KERNEL_PROXY
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#include <sys/socket.h>
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#endif
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#define ISCSI_PATH "/dev/iscsi"
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#define ISCSI_MAX_DATA_SEGMENT_LENGTH (128 * 1024)
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#define ISCSI_NAME_LEN 224 /* 223 bytes, by RFC 3720, + '\0' */
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#define ISCSI_ADDR_LEN 47 /* INET6_ADDRSTRLEN + '\0' */
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#define ISCSI_ALIAS_LEN 256 /* XXX: Where did it come from? */
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#define ISCSI_SECRET_LEN 17 /* 16 + '\0' */
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#define ISCSI_OFFLOAD_LEN 8
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#define ISCSI_REASON_LEN 64
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#define ISCSI_DIGEST_NONE 0
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#define ISCSI_DIGEST_CRC32C 1
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/*
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* Session configuration, set when adding the session.
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*/
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struct iscsi_session_conf {
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char isc_initiator[ISCSI_NAME_LEN];
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char isc_initiator_addr[ISCSI_ADDR_LEN];
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char isc_initiator_alias[ISCSI_ALIAS_LEN];
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char isc_target[ISCSI_NAME_LEN];
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char isc_target_addr[ISCSI_ADDR_LEN];
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char isc_user[ISCSI_NAME_LEN];
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char isc_secret[ISCSI_SECRET_LEN];
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char isc_mutual_user[ISCSI_NAME_LEN];
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char isc_mutual_secret[ISCSI_SECRET_LEN];
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int isc_discovery;
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int isc_header_digest;
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int isc_data_digest;
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int isc_iser;
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char isc_offload[ISCSI_OFFLOAD_LEN];
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int isc_spare[2];
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};
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/*
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* Additional constraints imposed by chosen ICL offload module;
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* iscsid(8) must obey those when negotiating operational parameters.
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*/
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struct iscsi_session_limits {
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size_t isl_max_data_segment_length;
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};
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/*
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* Session state, negotiated by iscsid(8) and queried by iscsictl(8).
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*/
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struct iscsi_session_state {
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struct iscsi_session_conf iss_conf;
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unsigned int iss_id;
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char iss_target_alias[ISCSI_ALIAS_LEN];
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int iss_header_digest;
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int iss_data_digest;
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int iss_max_data_segment_length;
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int iss_immediate_data;
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int iss_connected;
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char iss_reason[ISCSI_REASON_LEN];
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char iss_offload[ISCSI_OFFLOAD_LEN];
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int iss_spare[2];
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};
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/*
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* The following ioctls are used by iscsid(8).
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*/
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struct iscsi_daemon_request {
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unsigned int idr_session_id;
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struct iscsi_session_conf idr_conf;
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uint8_t idr_isid[6];
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uint16_t idr_tsih;
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uint16_t idr_spare_cid;
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struct iscsi_session_limits idr_limits;
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int idr_spare[2];
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};
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struct iscsi_daemon_handoff {
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unsigned int idh_session_id;
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int idh_socket;
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char idh_target_alias[ISCSI_ALIAS_LEN];
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uint8_t idh_spare_isid[6];
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uint16_t idh_tsih;
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uint16_t idh_spare_cid;
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uint32_t idh_statsn;
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int idh_header_digest;
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int idh_data_digest;
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int idh_initial_r2t;
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int idh_immediate_data;
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size_t idh_max_data_segment_length;
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size_t idh_max_burst_length;
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size_t idh_first_burst_length;
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int idh_spare[4];
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};
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struct iscsi_daemon_fail {
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unsigned int idf_session_id;
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char idf_reason[ISCSI_REASON_LEN];
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int idf_spare[4];
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};
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#define ISCSIDWAIT _IOR('I', 0x01, struct iscsi_daemon_request)
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#define ISCSIDHANDOFF _IOW('I', 0x02, struct iscsi_daemon_handoff)
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#define ISCSIDFAIL _IOW('I', 0x03, struct iscsi_daemon_fail)
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#ifdef ICL_KERNEL_PROXY
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/*
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* When ICL_KERNEL_PROXY is not defined, the iscsid(8) is responsible
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* for creating the socket, connecting, and performing Login Phase using
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* the socket in the usual userspace way, and then passing the socket
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* file descriptor to the kernel part using ISCSIDHANDOFF.
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*
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* When ICL_KERNEL_PROXY is defined, the iscsid(8) creates the session
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* using ISCSICONNECT, performs Login Phase using ISCSISEND/ISCSIRECEIVE
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* instead of read(2)/write(2), and then calls ISCSIDHANDOFF with
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* idh_socket set to 0.
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*
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* The purpose of ICL_KERNEL_PROXY is to workaround the fact that,
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* at this time, it's not possible to do iWARP (RDMA) in userspace.
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*/
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struct iscsi_daemon_connect {
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int idc_session_id;
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int idc_iser;
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int idc_domain;
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int idc_socktype;
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int idc_protocol;
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struct sockaddr *idc_from_addr;
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socklen_t idc_from_addrlen;
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struct sockaddr *idc_to_addr;
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socklen_t idc_to_addrlen;
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int idc_spare[4];
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};
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struct iscsi_daemon_send {
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int ids_session_id;
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void *ids_bhs;
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size_t ids_spare;
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void *ids_spare2;
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size_t ids_data_segment_len;
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void *ids_data_segment;
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int ids_spare3[4];
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};
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struct iscsi_daemon_receive {
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int idr_session_id;
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void *idr_bhs;
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size_t idr_spare;
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void *idr_spare2;
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size_t idr_data_segment_len;
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void *idr_data_segment;
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int idr_spare3[4];
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};
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#define ISCSIDCONNECT _IOWR('I', 0x04, struct iscsi_daemon_connect)
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#define ISCSIDSEND _IOWR('I', 0x05, struct iscsi_daemon_send)
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#define ISCSIDRECEIVE _IOWR('I', 0x06, struct iscsi_daemon_receive)
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#endif /* ICL_KERNEL_PROXY */
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/*
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* The following ioctls are used by iscsictl(8).
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*/
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struct iscsi_session_add {
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struct iscsi_session_conf isa_conf;
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int isa_spare[4];
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};
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struct iscsi_session_remove {
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unsigned int isr_session_id;
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struct iscsi_session_conf isr_conf;
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int isr_spare[4];
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};
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struct iscsi_session_list {
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unsigned int isl_nentries;
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struct iscsi_session_state *isl_pstates;
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int isl_spare[4];
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};
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struct iscsi_session_modify {
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unsigned int ism_session_id;
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struct iscsi_session_conf ism_conf;
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int ism_spare[4];
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};
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#define ISCSISADD _IOW('I', 0x11, struct iscsi_session_add)
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#define ISCSISREMOVE _IOW('I', 0x12, struct iscsi_session_remove)
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#define ISCSISLIST _IOWR('I', 0x13, struct iscsi_session_list)
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#define ISCSISMODIFY _IOWR('I', 0x14, struct iscsi_session_modify)
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#endif /* !ISCSI_IOCTL_H */
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