259f12da87
It allows to push out some final data from the send queue to the socket before its close. In particular, it increases chances for logout response to be delivered to the initiator.
159 lines
4.7 KiB
C
159 lines
4.7 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 ICL_H
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#define ICL_H
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/*
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* iSCSI Common Layer. It's used by both the initiator and target to send
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* and receive iSCSI PDUs.
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*/
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struct icl_conn;
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struct icl_pdu {
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STAILQ_ENTRY(icl_pdu) ip_next;
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struct icl_conn *ip_conn;
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struct iscsi_bhs *ip_bhs;
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struct mbuf *ip_bhs_mbuf;
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size_t ip_ahs_len;
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struct mbuf *ip_ahs_mbuf;
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size_t ip_data_len;
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struct mbuf *ip_data_mbuf;
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/*
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* User (initiator or provider) private fields.
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*/
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uint32_t ip_prv0;
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uint32_t ip_prv1;
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uint32_t ip_prv2;
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};
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struct icl_pdu *icl_pdu_new_bhs(struct icl_conn *ic, int flags);
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size_t icl_pdu_data_segment_length(const struct icl_pdu *ip);
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int icl_pdu_append_data(struct icl_pdu *ip, const void *addr, size_t len, int flags);
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void icl_pdu_get_data(struct icl_pdu *ip, size_t off, void *addr, size_t len);
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void icl_pdu_queue(struct icl_pdu *ip);
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void icl_pdu_free(struct icl_pdu *ip);
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#define ICL_CONN_STATE_INVALID 0
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#define ICL_CONN_STATE_BHS 1
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#define ICL_CONN_STATE_AHS 2
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#define ICL_CONN_STATE_HEADER_DIGEST 3
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#define ICL_CONN_STATE_DATA 4
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#define ICL_CONN_STATE_DATA_DIGEST 5
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#define ICL_MAX_DATA_SEGMENT_LENGTH (128 * 1024)
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struct icl_conn {
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struct mtx *ic_lock;
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struct socket *ic_socket;
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#ifdef DIAGNOSTIC
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volatile u_int ic_outstanding_pdus;
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#endif
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STAILQ_HEAD(, icl_pdu) ic_to_send;
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bool ic_check_send_space;
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size_t ic_receive_len;
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int ic_receive_state;
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struct icl_pdu *ic_receive_pdu;
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struct cv ic_send_cv;
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struct cv ic_receive_cv;
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bool ic_header_crc32c;
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bool ic_data_crc32c;
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bool ic_send_running;
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bool ic_receive_running;
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size_t ic_max_data_segment_length;
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bool ic_disconnecting;
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bool ic_iser;
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const char *ic_name;
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void (*ic_receive)(struct icl_pdu *);
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void (*ic_error)(struct icl_conn *);
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/*
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* User (initiator or provider) private fields.
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*/
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void *ic_prv0;
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};
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struct icl_conn *icl_conn_new(const char *name, struct mtx *lock);
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void icl_conn_free(struct icl_conn *ic);
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int icl_conn_handoff(struct icl_conn *ic, int fd);
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void icl_conn_close(struct icl_conn *ic);
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bool icl_conn_connected(struct icl_conn *ic);
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#ifdef ICL_KERNEL_PROXY
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struct sockaddr;
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struct icl_listen;
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struct icl_listen_sock {
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TAILQ_ENTRY(icl_listen_sock) ils_next;
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struct icl_listen *ils_listen;
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struct socket *ils_socket;
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bool ils_running;
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bool ils_disconnecting;
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int ils_id;
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};
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struct icl_listen {
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TAILQ_HEAD(, icl_listen_sock) il_sockets;
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struct sx il_lock;
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void (*il_accept)(struct socket *,
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struct sockaddr *, int);
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};
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/*
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* Initiator part.
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*/
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int icl_conn_connect(struct icl_conn *ic, bool rdma,
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int domain, int socktype, int protocol,
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struct sockaddr *from_sa, struct sockaddr *to_sa);
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/*
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* Target part.
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*/
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struct icl_listen *icl_listen_new(void (*accept_cb)(struct socket *,
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struct sockaddr *, int));
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void icl_listen_free(struct icl_listen *il);
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int icl_listen_add(struct icl_listen *il, bool rdma,
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int domain, int socktype, int protocol,
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struct sockaddr *sa, int portal_id);
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int icl_listen_remove(struct icl_listen *il, struct sockaddr *sa);
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/*
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* This one is not a public API; only to be used by icl_proxy.c.
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*/
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int icl_conn_handoff_sock(struct icl_conn *ic, struct socket *so);
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#endif /* ICL_KERNEL_PROXY */
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#endif /* !ICL_H */
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