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https://github.com/freebsd/freebsd-src
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97b84d344d
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
129 lines
4 KiB
C
129 lines
4 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 CTL_FRONTEND_ISCSI_H
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#define CTL_FRONTEND_ISCSI_H
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#define CFISCSI_TARGET_STATE_INVALID 0
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#define CFISCSI_TARGET_STATE_ACTIVE 1
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#define CFISCSI_TARGET_STATE_DYING 2
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struct cfiscsi_target {
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TAILQ_ENTRY(cfiscsi_target) ct_next;
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struct cfiscsi_softc *ct_softc;
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volatile u_int ct_refcount;
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char ct_name[CTL_ISCSI_NAME_LEN];
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char ct_alias[CTL_ISCSI_ALIAS_LEN];
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uint16_t ct_tag;
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int ct_state;
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int ct_online;
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int ct_target_id;
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struct ctl_port ct_port;
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};
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struct cfiscsi_data_wait {
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TAILQ_ENTRY(cfiscsi_data_wait) cdw_next;
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union ctl_io *cdw_ctl_io;
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uint32_t cdw_target_transfer_tag;
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uint32_t cdw_initiator_task_tag;
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int cdw_sg_index;
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char *cdw_sg_addr;
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size_t cdw_sg_len;
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uint32_t cdw_r2t_end;
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uint32_t cdw_datasn;
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void *cdw_icl_prv;
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};
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#define CFISCSI_SESSION_STATE_INVALID 0
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#define CFISCSI_SESSION_STATE_BHS 1
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#define CFISCSI_SESSION_STATE_AHS 2
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#define CFISCSI_SESSION_STATE_HEADER_DIGEST 3
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#define CFISCSI_SESSION_STATE_DATA 4
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#define CFISCSI_SESSION_STATE_DATA_DIGEST 5
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struct cfiscsi_session {
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TAILQ_ENTRY(cfiscsi_session) cs_next;
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struct mtx cs_lock;
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struct icl_conn *cs_conn;
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uint32_t cs_cmdsn;
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uint32_t cs_statsn;
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uint32_t cs_target_transfer_tag;
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volatile u_int cs_outstanding_ctl_pdus;
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TAILQ_HEAD(, cfiscsi_data_wait) cs_waiting_for_data_out;
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struct cfiscsi_target *cs_target;
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struct callout cs_callout;
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int cs_timeout;
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struct cv cs_maintenance_cv;
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bool cs_terminating;
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bool cs_tasks_aborted;
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int cs_max_recv_data_segment_length;
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int cs_max_send_data_segment_length;
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int cs_max_burst_length;
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int cs_first_burst_length;
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bool cs_immediate_data;
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char cs_initiator_name[CTL_ISCSI_NAME_LEN];
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char cs_initiator_addr[CTL_ISCSI_ADDR_LEN];
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char cs_initiator_alias[CTL_ISCSI_ALIAS_LEN];
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char cs_initiator_isid[6];
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char cs_initiator_id[CTL_ISCSI_NAME_LEN + 5 + 6 + 1];
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unsigned int cs_id;
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int cs_ctl_initid;
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#ifdef ICL_KERNEL_PROXY
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struct sockaddr *cs_initiator_sa;
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int cs_portal_id;
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bool cs_login_phase;
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bool cs_waiting_for_ctld;
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struct cv cs_login_cv;
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struct icl_pdu *cs_login_pdu;
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#endif
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};
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#ifdef ICL_KERNEL_PROXY
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struct icl_listen;
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#endif
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struct cfiscsi_softc {
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struct mtx lock;
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char port_name[32];
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int online;
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int last_target_id;
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unsigned int last_session_id;
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TAILQ_HEAD(, cfiscsi_target) targets;
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TAILQ_HEAD(, cfiscsi_session) sessions;
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struct cv sessions_cv;
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#ifdef ICL_KERNEL_PROXY
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struct icl_listen *listener;
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struct cv accept_cv;
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#endif
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};
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#endif /* !CTL_FRONTEND_ISCSI_H */
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