1780 lines
42 KiB
C
1780 lines
42 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2012 The FreeBSD Foundation
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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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*/
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/*
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* Software implementation of iSCSI Common Layer kobj(9) interface.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/bio.h>
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#include <sys/capsicum.h>
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#include <sys/condvar.h>
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#include <sys/conf.h>
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#include <sys/gsb_crc32.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/module.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/sx.h>
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#include <sys/uio.h>
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#include <vm/uma.h>
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#include <vm/vm_page.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <dev/iscsi/icl.h>
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#include <dev/iscsi/iscsi_proto.h>
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#include <icl_conn_if.h>
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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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struct icl_soft_conn {
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struct icl_conn ic;
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/* soft specific stuff goes here. */
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STAILQ_HEAD(, icl_pdu) to_send;
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struct cv send_cv;
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struct cv receive_cv;
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struct icl_pdu *receive_pdu;
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size_t receive_len;
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int receive_state;
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bool receive_running;
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bool check_send_space;
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bool send_running;
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};
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struct icl_soft_pdu {
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struct icl_pdu ip;
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/* soft specific stuff goes here. */
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u_int ref_cnt;
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icl_pdu_cb cb;
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int error;
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};
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SYSCTL_NODE(_kern_icl, OID_AUTO, soft, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
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"Software iSCSI");
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static int coalesce = 1;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, coalesce, CTLFLAG_RWTUN,
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&coalesce, 0, "Try to coalesce PDUs before sending");
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static int partial_receive_len = 256 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN,
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&partial_receive_len, 0, "Minimum read size for partially received "
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"data segment");
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static int max_data_segment_length = 256 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, max_data_segment_length, CTLFLAG_RWTUN,
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&max_data_segment_length, 0, "Maximum data segment length");
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static int first_burst_length = 1024 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, first_burst_length, CTLFLAG_RWTUN,
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&first_burst_length, 0, "First burst length");
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static int max_burst_length = 1024 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, max_burst_length, CTLFLAG_RWTUN,
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&max_burst_length, 0, "Maximum burst length");
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static int sendspace = 1536 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, sendspace, CTLFLAG_RWTUN,
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&sendspace, 0, "Default send socket buffer size");
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static int recvspace = 1536 * 1024;
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SYSCTL_INT(_kern_icl_soft, OID_AUTO, recvspace, CTLFLAG_RWTUN,
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&recvspace, 0, "Default receive socket buffer size");
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static MALLOC_DEFINE(M_ICL_SOFT, "icl_soft", "iSCSI software backend");
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static uma_zone_t icl_soft_pdu_zone;
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static volatile u_int icl_ncons;
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STAILQ_HEAD(icl_pdu_stailq, icl_pdu);
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static icl_conn_new_pdu_t icl_soft_conn_new_pdu;
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static icl_conn_pdu_free_t icl_soft_conn_pdu_free;
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static icl_conn_pdu_data_segment_length_t
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icl_soft_conn_pdu_data_segment_length;
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static icl_conn_pdu_append_bio_t icl_soft_conn_pdu_append_bio;
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static icl_conn_pdu_append_data_t icl_soft_conn_pdu_append_data;
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static icl_conn_pdu_get_bio_t icl_soft_conn_pdu_get_bio;
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static icl_conn_pdu_get_data_t icl_soft_conn_pdu_get_data;
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static icl_conn_pdu_queue_t icl_soft_conn_pdu_queue;
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static icl_conn_pdu_queue_cb_t icl_soft_conn_pdu_queue_cb;
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static icl_conn_handoff_t icl_soft_conn_handoff;
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static icl_conn_free_t icl_soft_conn_free;
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static icl_conn_close_t icl_soft_conn_close;
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static icl_conn_task_setup_t icl_soft_conn_task_setup;
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static icl_conn_task_done_t icl_soft_conn_task_done;
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static icl_conn_transfer_setup_t icl_soft_conn_transfer_setup;
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static icl_conn_transfer_done_t icl_soft_conn_transfer_done;
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#ifdef ICL_KERNEL_PROXY
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static icl_conn_connect_t icl_soft_conn_connect;
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#endif
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static kobj_method_t icl_soft_methods[] = {
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KOBJMETHOD(icl_conn_new_pdu, icl_soft_conn_new_pdu),
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KOBJMETHOD(icl_conn_pdu_free, icl_soft_conn_pdu_free),
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KOBJMETHOD(icl_conn_pdu_data_segment_length,
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icl_soft_conn_pdu_data_segment_length),
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KOBJMETHOD(icl_conn_pdu_append_bio, icl_soft_conn_pdu_append_bio),
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KOBJMETHOD(icl_conn_pdu_append_data, icl_soft_conn_pdu_append_data),
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KOBJMETHOD(icl_conn_pdu_get_bio, icl_soft_conn_pdu_get_bio),
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KOBJMETHOD(icl_conn_pdu_get_data, icl_soft_conn_pdu_get_data),
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KOBJMETHOD(icl_conn_pdu_queue, icl_soft_conn_pdu_queue),
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KOBJMETHOD(icl_conn_pdu_queue_cb, icl_soft_conn_pdu_queue_cb),
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KOBJMETHOD(icl_conn_handoff, icl_soft_conn_handoff),
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KOBJMETHOD(icl_conn_free, icl_soft_conn_free),
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KOBJMETHOD(icl_conn_close, icl_soft_conn_close),
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KOBJMETHOD(icl_conn_task_setup, icl_soft_conn_task_setup),
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KOBJMETHOD(icl_conn_task_done, icl_soft_conn_task_done),
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KOBJMETHOD(icl_conn_transfer_setup, icl_soft_conn_transfer_setup),
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KOBJMETHOD(icl_conn_transfer_done, icl_soft_conn_transfer_done),
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#ifdef ICL_KERNEL_PROXY
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KOBJMETHOD(icl_conn_connect, icl_soft_conn_connect),
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#endif
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{ 0, 0 }
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};
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DEFINE_CLASS(icl_soft, icl_soft_methods, sizeof(struct icl_soft_conn));
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static void
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icl_conn_fail(struct icl_conn *ic)
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{
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if (ic->ic_socket == NULL)
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return;
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/*
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* XXX
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*/
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ic->ic_socket->so_error = EDOOFUS;
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(ic->ic_error)(ic);
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}
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static void
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icl_soft_conn_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
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{
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struct icl_soft_pdu *isp = (struct icl_soft_pdu *)ip;
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KASSERT(isp->ref_cnt == 0, ("freeing active PDU"));
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m_freem(ip->ip_bhs_mbuf);
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m_freem(ip->ip_ahs_mbuf);
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m_freem(ip->ip_data_mbuf);
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uma_zfree(icl_soft_pdu_zone, isp);
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#ifdef DIAGNOSTIC
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refcount_release(&ic->ic_outstanding_pdus);
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#endif
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}
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static void
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icl_soft_pdu_call_cb(struct icl_pdu *ip)
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{
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struct icl_soft_pdu *isp = (struct icl_soft_pdu *)ip;
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if (isp->cb != NULL)
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isp->cb(ip, isp->error);
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#ifdef DIAGNOSTIC
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refcount_release(&ip->ip_conn->ic_outstanding_pdus);
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#endif
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uma_zfree(icl_soft_pdu_zone, isp);
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}
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static void
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icl_soft_pdu_done(struct icl_pdu *ip, int error)
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{
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struct icl_soft_pdu *isp = (struct icl_soft_pdu *)ip;
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if (error != 0)
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isp->error = error;
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m_freem(ip->ip_bhs_mbuf);
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ip->ip_bhs_mbuf = NULL;
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m_freem(ip->ip_ahs_mbuf);
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ip->ip_ahs_mbuf = NULL;
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m_freem(ip->ip_data_mbuf);
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ip->ip_data_mbuf = NULL;
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if (atomic_fetchadd_int(&isp->ref_cnt, -1) == 1)
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icl_soft_pdu_call_cb(ip);
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}
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static void
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icl_soft_mbuf_done(struct mbuf *mb)
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{
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struct icl_soft_pdu *isp = (struct icl_soft_pdu *)mb->m_ext.ext_arg1;
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icl_soft_pdu_call_cb(&isp->ip);
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}
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/*
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* Allocate icl_pdu with empty BHS to fill up by the caller.
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*/
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struct icl_pdu *
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icl_soft_conn_new_pdu(struct icl_conn *ic, int flags)
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{
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struct icl_soft_pdu *isp;
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struct icl_pdu *ip;
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#ifdef DIAGNOSTIC
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refcount_acquire(&ic->ic_outstanding_pdus);
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#endif
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isp = uma_zalloc(icl_soft_pdu_zone, flags | M_ZERO);
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if (isp == NULL) {
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ICL_WARN("failed to allocate soft PDU");
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#ifdef DIAGNOSTIC
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refcount_release(&ic->ic_outstanding_pdus);
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#endif
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return (NULL);
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}
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ip = &isp->ip;
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ip->ip_conn = ic;
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CTASSERT(sizeof(struct iscsi_bhs) <= MHLEN);
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ip->ip_bhs_mbuf = m_gethdr(flags, MT_DATA);
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if (ip->ip_bhs_mbuf == NULL) {
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ICL_WARN("failed to allocate BHS mbuf");
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icl_soft_conn_pdu_free(ic, ip);
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return (NULL);
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}
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ip->ip_bhs = mtod(ip->ip_bhs_mbuf, struct iscsi_bhs *);
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memset(ip->ip_bhs, 0, sizeof(struct iscsi_bhs));
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ip->ip_bhs_mbuf->m_len = sizeof(struct iscsi_bhs);
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return (ip);
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}
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static int
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icl_pdu_ahs_length(const struct icl_pdu *request)
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{
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return (request->ip_bhs->bhs_total_ahs_len * 4);
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}
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static size_t
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icl_pdu_data_segment_length(const struct icl_pdu *request)
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{
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uint32_t len = 0;
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len += request->ip_bhs->bhs_data_segment_len[0];
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len <<= 8;
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len += request->ip_bhs->bhs_data_segment_len[1];
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len <<= 8;
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len += request->ip_bhs->bhs_data_segment_len[2];
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return (len);
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}
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size_t
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icl_soft_conn_pdu_data_segment_length(struct icl_conn *ic,
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const struct icl_pdu *request)
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{
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return (icl_pdu_data_segment_length(request));
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}
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static void
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icl_pdu_set_data_segment_length(struct icl_pdu *response, uint32_t len)
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{
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response->ip_bhs->bhs_data_segment_len[2] = len;
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response->ip_bhs->bhs_data_segment_len[1] = len >> 8;
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response->ip_bhs->bhs_data_segment_len[0] = len >> 16;
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}
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static size_t
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icl_pdu_padding(const struct icl_pdu *ip)
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{
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if ((ip->ip_data_len % 4) != 0)
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return (4 - (ip->ip_data_len % 4));
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return (0);
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}
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static size_t
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icl_pdu_size(const struct icl_pdu *response)
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{
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size_t len;
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KASSERT(response->ip_ahs_len == 0, ("responding with AHS"));
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len = sizeof(struct iscsi_bhs) + response->ip_data_len +
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icl_pdu_padding(response);
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if (response->ip_conn->ic_header_crc32c)
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len += ISCSI_HEADER_DIGEST_SIZE;
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if (response->ip_data_len != 0 && response->ip_conn->ic_data_crc32c)
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len += ISCSI_DATA_DIGEST_SIZE;
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return (len);
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}
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static void
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icl_soft_receive_buf(struct mbuf **r, size_t *rs, void *buf, size_t s)
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{
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m_copydata(*r, 0, s, buf);
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m_adj(*r, s);
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while ((*r) != NULL && (*r)->m_len == 0)
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*r = m_free(*r);
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*rs -= s;
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}
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static void
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icl_pdu_receive_ahs(struct icl_pdu *request, struct mbuf **r, size_t *rs)
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{
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request->ip_ahs_len = icl_pdu_ahs_length(request);
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if (request->ip_ahs_len == 0)
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return;
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request->ip_ahs_mbuf = *r;
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*r = m_split(request->ip_ahs_mbuf, request->ip_ahs_len, M_WAITOK);
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*rs -= request->ip_ahs_len;
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}
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static int
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mbuf_crc32c_helper(void *arg, void *data, u_int len)
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{
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uint32_t *digestp = arg;
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*digestp = calculate_crc32c(*digestp, data, len);
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return (0);
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}
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static uint32_t
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icl_mbuf_to_crc32c(struct mbuf *m0, size_t len)
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{
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uint32_t digest = 0xffffffff;
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m_apply(m0, 0, len, mbuf_crc32c_helper, &digest);
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digest = digest ^ 0xffffffff;
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return (digest);
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}
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static int
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icl_pdu_check_header_digest(struct icl_pdu *request, struct mbuf **r, size_t *rs)
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{
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uint32_t received_digest, valid_digest;
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if (request->ip_conn->ic_header_crc32c == false)
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return (0);
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CTASSERT(sizeof(received_digest) == ISCSI_HEADER_DIGEST_SIZE);
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icl_soft_receive_buf(r, rs, &received_digest, ISCSI_HEADER_DIGEST_SIZE);
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/* Temporary attach AHS to BHS to calculate header digest. */
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request->ip_bhs_mbuf->m_next = request->ip_ahs_mbuf;
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valid_digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf, ISCSI_BHS_SIZE);
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request->ip_bhs_mbuf->m_next = NULL;
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if (received_digest != valid_digest) {
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ICL_WARN("header digest check failed; got 0x%x, "
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"should be 0x%x", received_digest, valid_digest);
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return (-1);
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}
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return (0);
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}
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/*
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* Return the number of bytes that should be waiting in the receive socket
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* before icl_pdu_receive_data_segment() gets called.
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*/
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static size_t
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icl_pdu_data_segment_receive_len(const struct icl_pdu *request)
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{
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size_t len;
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len = icl_pdu_data_segment_length(request);
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if (len == 0)
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return (0);
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/*
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* Account for the parts of data segment already read from
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* the socket buffer.
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*/
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KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len"));
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len -= request->ip_data_len;
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/*
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* Don't always wait for the full data segment to be delivered
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* to the socket; this might badly affect performance due to
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* TCP window scaling.
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*/
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if (len > partial_receive_len) {
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#if 0
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ICL_DEBUG("need %zd bytes of data, limiting to %zd",
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len, partial_receive_len));
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#endif
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len = partial_receive_len;
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return (len);
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}
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/*
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* Account for padding. Note that due to the way code is written,
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* the icl_pdu_receive_data_segment() must always receive padding
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* along with the last part of data segment, because it would be
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* impossible to tell whether we've already received the full data
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* segment including padding, or without it.
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*/
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if ((len % 4) != 0)
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len += 4 - (len % 4);
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#if 0
|
|
ICL_DEBUG("need %zd bytes of data", len));
|
|
#endif
|
|
|
|
return (len);
|
|
}
|
|
|
|
static int
|
|
icl_pdu_receive_data_segment(struct icl_pdu *request, struct mbuf **r,
|
|
size_t *rs, bool *more_neededp)
|
|
{
|
|
struct icl_soft_conn *isc;
|
|
size_t len, padding = 0;
|
|
struct mbuf *m;
|
|
|
|
isc = (struct icl_soft_conn *)request->ip_conn;
|
|
|
|
*more_neededp = false;
|
|
isc->receive_len = 0;
|
|
|
|
len = icl_pdu_data_segment_length(request);
|
|
if (len == 0)
|
|
return (0);
|
|
|
|
if ((len % 4) != 0)
|
|
padding = 4 - (len % 4);
|
|
|
|
/*
|
|
* Account for already received parts of data segment.
|
|
*/
|
|
KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len"));
|
|
len -= request->ip_data_len;
|
|
|
|
if (len + padding > *rs) {
|
|
/*
|
|
* Not enough data in the socket buffer. Receive as much
|
|
* as we can. Don't receive padding, since, obviously, it's
|
|
* not the end of data segment yet.
|
|
*/
|
|
#if 0
|
|
ICL_DEBUG("limited from %zd to %zd",
|
|
len + padding, *rs - padding));
|
|
#endif
|
|
len = *rs - padding;
|
|
*more_neededp = true;
|
|
padding = 0;
|
|
}
|
|
|
|
/*
|
|
* Must not try to receive padding without at least one byte
|
|
* of actual data segment.
|
|
*/
|
|
if (len > 0) {
|
|
m = *r;
|
|
*r = m_split(m, len + padding, M_WAITOK);
|
|
*rs -= len + padding;
|
|
|
|
if (request->ip_data_mbuf == NULL)
|
|
request->ip_data_mbuf = m;
|
|
else
|
|
m_cat(request->ip_data_mbuf, m);
|
|
|
|
request->ip_data_len += len;
|
|
} else
|
|
ICL_DEBUG("len 0");
|
|
|
|
if (*more_neededp)
|
|
isc->receive_len = icl_pdu_data_segment_receive_len(request);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icl_pdu_check_data_digest(struct icl_pdu *request, struct mbuf **r, size_t *rs)
|
|
{
|
|
uint32_t received_digest, valid_digest;
|
|
|
|
if (request->ip_conn->ic_data_crc32c == false)
|
|
return (0);
|
|
|
|
if (request->ip_data_len == 0)
|
|
return (0);
|
|
|
|
CTASSERT(sizeof(received_digest) == ISCSI_DATA_DIGEST_SIZE);
|
|
icl_soft_receive_buf(r, rs, &received_digest, ISCSI_DATA_DIGEST_SIZE);
|
|
|
|
/*
|
|
* Note that ip_data_mbuf also contains padding; since digest
|
|
* calculation is supposed to include that, we iterate over
|
|
* the entire ip_data_mbuf chain, not just ip_data_len bytes of it.
|
|
*/
|
|
valid_digest = icl_mbuf_to_crc32c(request->ip_data_mbuf,
|
|
roundup2(request->ip_data_len, 4));
|
|
if (received_digest != valid_digest) {
|
|
ICL_WARN("data digest check failed; got 0x%x, "
|
|
"should be 0x%x", received_digest, valid_digest);
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Somewhat contrary to the name, this attempts to receive only one
|
|
* "part" of PDU at a time; call it repeatedly until it returns non-NULL.
|
|
*/
|
|
static struct icl_pdu *
|
|
icl_conn_receive_pdu(struct icl_soft_conn *isc, struct mbuf **r, size_t *rs)
|
|
{
|
|
struct icl_conn *ic = &isc->ic;
|
|
struct icl_pdu *request;
|
|
size_t len;
|
|
int error = 0;
|
|
bool more_needed;
|
|
|
|
if (isc->receive_state == ICL_CONN_STATE_BHS) {
|
|
KASSERT(isc->receive_pdu == NULL,
|
|
("isc->receive_pdu != NULL"));
|
|
request = icl_soft_conn_new_pdu(ic, M_NOWAIT);
|
|
if (request == NULL) {
|
|
ICL_DEBUG("failed to allocate PDU; "
|
|
"dropping connection");
|
|
icl_conn_fail(ic);
|
|
return (NULL);
|
|
}
|
|
isc->receive_pdu = request;
|
|
} else {
|
|
KASSERT(isc->receive_pdu != NULL,
|
|
("isc->receive_pdu == NULL"));
|
|
request = isc->receive_pdu;
|
|
}
|
|
|
|
switch (isc->receive_state) {
|
|
case ICL_CONN_STATE_BHS:
|
|
//ICL_DEBUG("receiving BHS");
|
|
icl_soft_receive_buf(r, rs, request->ip_bhs,
|
|
sizeof(struct iscsi_bhs));
|
|
|
|
/*
|
|
* We don't enforce any limit for AHS length;
|
|
* its length is stored in 8 bit field.
|
|
*/
|
|
|
|
len = icl_pdu_data_segment_length(request);
|
|
if (len > ic->ic_max_recv_data_segment_length) {
|
|
ICL_WARN("received data segment "
|
|
"length %zd is larger than negotiated; "
|
|
"dropping connection", len);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
isc->receive_state = ICL_CONN_STATE_AHS;
|
|
isc->receive_len = icl_pdu_ahs_length(request);
|
|
break;
|
|
|
|
case ICL_CONN_STATE_AHS:
|
|
//ICL_DEBUG("receiving AHS");
|
|
icl_pdu_receive_ahs(request, r, rs);
|
|
isc->receive_state = ICL_CONN_STATE_HEADER_DIGEST;
|
|
if (ic->ic_header_crc32c == false)
|
|
isc->receive_len = 0;
|
|
else
|
|
isc->receive_len = ISCSI_HEADER_DIGEST_SIZE;
|
|
break;
|
|
|
|
case ICL_CONN_STATE_HEADER_DIGEST:
|
|
//ICL_DEBUG("receiving header digest");
|
|
error = icl_pdu_check_header_digest(request, r, rs);
|
|
if (error != 0) {
|
|
ICL_DEBUG("header digest failed; "
|
|
"dropping connection");
|
|
break;
|
|
}
|
|
|
|
isc->receive_state = ICL_CONN_STATE_DATA;
|
|
isc->receive_len = icl_pdu_data_segment_receive_len(request);
|
|
break;
|
|
|
|
case ICL_CONN_STATE_DATA:
|
|
//ICL_DEBUG("receiving data segment");
|
|
error = icl_pdu_receive_data_segment(request, r, rs,
|
|
&more_needed);
|
|
if (error != 0) {
|
|
ICL_DEBUG("failed to receive data segment;"
|
|
"dropping connection");
|
|
break;
|
|
}
|
|
|
|
if (more_needed)
|
|
break;
|
|
|
|
isc->receive_state = ICL_CONN_STATE_DATA_DIGEST;
|
|
if (request->ip_data_len == 0 || ic->ic_data_crc32c == false)
|
|
isc->receive_len = 0;
|
|
else
|
|
isc->receive_len = ISCSI_DATA_DIGEST_SIZE;
|
|
break;
|
|
|
|
case ICL_CONN_STATE_DATA_DIGEST:
|
|
//ICL_DEBUG("receiving data digest");
|
|
error = icl_pdu_check_data_digest(request, r, rs);
|
|
if (error != 0) {
|
|
ICL_DEBUG("data digest failed; "
|
|
"dropping connection");
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We've received complete PDU; reset the receive state machine
|
|
* and return the PDU.
|
|
*/
|
|
isc->receive_state = ICL_CONN_STATE_BHS;
|
|
isc->receive_len = sizeof(struct iscsi_bhs);
|
|
isc->receive_pdu = NULL;
|
|
return (request);
|
|
|
|
default:
|
|
panic("invalid receive_state %d\n", isc->receive_state);
|
|
}
|
|
|
|
if (error != 0) {
|
|
/*
|
|
* Don't free the PDU; it's pointed to by isc->receive_pdu
|
|
* and will get freed in icl_soft_conn_close().
|
|
*/
|
|
icl_conn_fail(ic);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
icl_conn_receive_pdus(struct icl_soft_conn *isc, struct mbuf **r, size_t *rs)
|
|
{
|
|
struct icl_conn *ic = &isc->ic;
|
|
struct icl_pdu *response;
|
|
|
|
for (;;) {
|
|
if (ic->ic_disconnecting)
|
|
return;
|
|
|
|
/*
|
|
* Loop until we have a complete PDU or there is not enough
|
|
* data in the socket buffer.
|
|
*/
|
|
if (*rs < isc->receive_len) {
|
|
#if 0
|
|
ICL_DEBUG("not enough data; have %zd, need %zd",
|
|
*rs, isc->receive_len);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
response = icl_conn_receive_pdu(isc, r, rs);
|
|
if (response == NULL)
|
|
continue;
|
|
|
|
if (response->ip_ahs_len > 0) {
|
|
ICL_WARN("received PDU with unsupported "
|
|
"AHS; opcode 0x%x; dropping connection",
|
|
response->ip_bhs->bhs_opcode);
|
|
icl_soft_conn_pdu_free(ic, response);
|
|
icl_conn_fail(ic);
|
|
return;
|
|
}
|
|
|
|
(ic->ic_receive)(response);
|
|
}
|
|
}
|
|
|
|
static void
|
|
icl_receive_thread(void *arg)
|
|
{
|
|
struct icl_soft_conn *isc = arg;
|
|
struct icl_conn *ic = &isc->ic;
|
|
size_t available, read = 0;
|
|
struct socket *so;
|
|
struct mbuf *m, *r = NULL;
|
|
struct uio uio;
|
|
int error, flags;
|
|
|
|
so = ic->ic_socket;
|
|
|
|
for (;;) {
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (ic->ic_disconnecting) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Set the low watermark, to be checked by
|
|
* soreadable() in icl_soupcall_receive()
|
|
* to avoid unnecessary wakeups until there
|
|
* is enough data received to read the PDU.
|
|
*/
|
|
available = sbavail(&so->so_rcv);
|
|
if (read + available < isc->receive_len) {
|
|
so->so_rcv.sb_lowat = isc->receive_len - read;
|
|
cv_wait(&isc->receive_cv, SOCKBUF_MTX(&so->so_rcv));
|
|
so->so_rcv.sb_lowat = so->so_rcv.sb_hiwat + 1;
|
|
available = sbavail(&so->so_rcv);
|
|
}
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
|
|
if (available == 0) {
|
|
if (so->so_error != 0) {
|
|
ICL_DEBUG("connection error %d; "
|
|
"dropping connection", so->so_error);
|
|
icl_conn_fail(ic);
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
memset(&uio, 0, sizeof(uio));
|
|
uio.uio_resid = available;
|
|
flags = MSG_DONTWAIT;
|
|
error = soreceive(so, NULL, &uio, &m, NULL, &flags);
|
|
if (error != 0) {
|
|
ICL_DEBUG("soreceive error %d", error);
|
|
break;
|
|
}
|
|
if (uio.uio_resid != 0) {
|
|
m_freem(m);
|
|
ICL_DEBUG("short read");
|
|
break;
|
|
}
|
|
if (r)
|
|
m_cat(r, m);
|
|
else
|
|
r = m;
|
|
read += available;
|
|
|
|
icl_conn_receive_pdus(isc, &r, &read);
|
|
}
|
|
|
|
if (r)
|
|
m_freem(r);
|
|
|
|
ICL_CONN_LOCK(ic);
|
|
isc->receive_running = false;
|
|
cv_signal(&isc->send_cv);
|
|
ICL_CONN_UNLOCK(ic);
|
|
kthread_exit();
|
|
}
|
|
|
|
static int
|
|
icl_soupcall_receive(struct socket *so, void *arg, int waitflag)
|
|
{
|
|
struct icl_soft_conn *isc;
|
|
|
|
if (!soreadable(so))
|
|
return (SU_OK);
|
|
|
|
isc = arg;
|
|
cv_signal(&isc->receive_cv);
|
|
return (SU_OK);
|
|
}
|
|
|
|
static int
|
|
icl_pdu_finalize(struct icl_pdu *request)
|
|
{
|
|
size_t padding, pdu_len;
|
|
uint32_t digest, zero = 0;
|
|
int ok;
|
|
struct icl_conn *ic;
|
|
|
|
ic = request->ip_conn;
|
|
|
|
icl_pdu_set_data_segment_length(request, request->ip_data_len);
|
|
|
|
pdu_len = icl_pdu_size(request);
|
|
|
|
if (ic->ic_header_crc32c) {
|
|
digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf,
|
|
ISCSI_BHS_SIZE);
|
|
ok = m_append(request->ip_bhs_mbuf, sizeof(digest),
|
|
(void *)&digest);
|
|
if (ok != 1) {
|
|
ICL_WARN("failed to append header digest");
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
if (request->ip_data_len != 0) {
|
|
padding = icl_pdu_padding(request);
|
|
if (padding > 0) {
|
|
ok = m_append(request->ip_data_mbuf, padding,
|
|
(void *)&zero);
|
|
if (ok != 1) {
|
|
ICL_WARN("failed to append padding");
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
if (ic->ic_data_crc32c) {
|
|
digest = icl_mbuf_to_crc32c(request->ip_data_mbuf,
|
|
roundup2(request->ip_data_len, 4));
|
|
|
|
ok = m_append(request->ip_data_mbuf, sizeof(digest),
|
|
(void *)&digest);
|
|
if (ok != 1) {
|
|
ICL_WARN("failed to append data digest");
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
m_cat(request->ip_bhs_mbuf, request->ip_data_mbuf);
|
|
request->ip_data_mbuf = NULL;
|
|
}
|
|
|
|
request->ip_bhs_mbuf->m_pkthdr.len = pdu_len;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
icl_conn_send_pdus(struct icl_soft_conn *isc, struct icl_pdu_stailq *queue)
|
|
{
|
|
struct icl_conn *ic = &isc->ic;
|
|
struct icl_pdu *request, *request2;
|
|
struct mbuf *m;
|
|
struct socket *so;
|
|
long available, size, size2;
|
|
#ifdef DEBUG_COALESCED
|
|
int coalesced;
|
|
#endif
|
|
int error;
|
|
|
|
ICL_CONN_LOCK_ASSERT_NOT(ic);
|
|
|
|
so = ic->ic_socket;
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
/*
|
|
* Check how much space do we have for transmit. We can't just
|
|
* call sosend() and retry when we get EWOULDBLOCK or EMSGSIZE,
|
|
* as it always frees the mbuf chain passed to it, even in case
|
|
* of error.
|
|
*/
|
|
available = sbspace(&so->so_snd);
|
|
isc->check_send_space = false;
|
|
|
|
/*
|
|
* Notify the socket upcall that we don't need wakeups
|
|
* for the time being.
|
|
*/
|
|
so->so_snd.sb_lowat = so->so_snd.sb_hiwat + 1;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
|
|
while (!STAILQ_EMPTY(queue)) {
|
|
request = STAILQ_FIRST(queue);
|
|
size = icl_pdu_size(request);
|
|
if (available < size) {
|
|
/*
|
|
* Set the low watermark, to be checked by
|
|
* sowriteable() in icl_soupcall_send()
|
|
* to avoid unnecessary wakeups until there
|
|
* is enough space for the PDU to fit.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
available = sbspace(&so->so_snd);
|
|
if (available < size) {
|
|
#if 1
|
|
ICL_DEBUG("no space to send; "
|
|
"have %ld, need %ld",
|
|
available, size);
|
|
#endif
|
|
so->so_snd.sb_lowat = max(size,
|
|
so->so_snd.sb_hiwat / 8);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
return;
|
|
}
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
}
|
|
STAILQ_REMOVE_HEAD(queue, ip_next);
|
|
error = icl_pdu_finalize(request);
|
|
if (error != 0) {
|
|
ICL_DEBUG("failed to finalize PDU; "
|
|
"dropping connection");
|
|
icl_soft_pdu_done(request, EIO);
|
|
icl_conn_fail(ic);
|
|
return;
|
|
}
|
|
if (coalesce) {
|
|
m = request->ip_bhs_mbuf;
|
|
for (
|
|
#ifdef DEBUG_COALESCED
|
|
coalesced = 1
|
|
#endif
|
|
; ;
|
|
#ifdef DEBUG_COALESCED
|
|
coalesced++
|
|
#endif
|
|
) {
|
|
request2 = STAILQ_FIRST(queue);
|
|
if (request2 == NULL)
|
|
break;
|
|
size2 = icl_pdu_size(request2);
|
|
if (available < size + size2)
|
|
break;
|
|
STAILQ_REMOVE_HEAD(queue, ip_next);
|
|
error = icl_pdu_finalize(request2);
|
|
if (error != 0) {
|
|
ICL_DEBUG("failed to finalize PDU; "
|
|
"dropping connection");
|
|
icl_soft_pdu_done(request, EIO);
|
|
icl_soft_pdu_done(request2, EIO);
|
|
icl_conn_fail(ic);
|
|
return;
|
|
}
|
|
while (m->m_next)
|
|
m = m->m_next;
|
|
m_cat(m, request2->ip_bhs_mbuf);
|
|
request2->ip_bhs_mbuf = NULL;
|
|
request->ip_bhs_mbuf->m_pkthdr.len += size2;
|
|
size += size2;
|
|
icl_soft_pdu_done(request2, 0);
|
|
}
|
|
#ifdef DEBUG_COALESCED
|
|
if (coalesced > 1) {
|
|
ICL_DEBUG("coalesced %d PDUs into %ld bytes",
|
|
coalesced, size);
|
|
}
|
|
#endif
|
|
}
|
|
available -= size;
|
|
error = sosend(so, NULL, NULL, request->ip_bhs_mbuf,
|
|
NULL, MSG_DONTWAIT, curthread);
|
|
request->ip_bhs_mbuf = NULL; /* Sosend consumes the mbuf. */
|
|
if (error != 0) {
|
|
ICL_DEBUG("failed to send PDU, error %d; "
|
|
"dropping connection", error);
|
|
icl_soft_pdu_done(request, error);
|
|
icl_conn_fail(ic);
|
|
return;
|
|
}
|
|
icl_soft_pdu_done(request, 0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
icl_send_thread(void *arg)
|
|
{
|
|
struct icl_soft_conn *isc;
|
|
struct icl_conn *ic;
|
|
struct icl_pdu_stailq queue;
|
|
|
|
isc = arg;
|
|
ic = &isc->ic;
|
|
|
|
STAILQ_INIT(&queue);
|
|
|
|
ICL_CONN_LOCK(ic);
|
|
for (;;) {
|
|
for (;;) {
|
|
/*
|
|
* Populate the local queue from the main one.
|
|
* This way the icl_conn_send_pdus() can go through
|
|
* all the queued PDUs without holding any locks.
|
|
*/
|
|
if (STAILQ_EMPTY(&queue) || isc->check_send_space)
|
|
STAILQ_CONCAT(&queue, &isc->to_send);
|
|
|
|
ICL_CONN_UNLOCK(ic);
|
|
icl_conn_send_pdus(isc, &queue);
|
|
ICL_CONN_LOCK(ic);
|
|
|
|
/*
|
|
* The icl_soupcall_send() was called since the last
|
|
* call to sbspace(); go around;
|
|
*/
|
|
if (isc->check_send_space)
|
|
continue;
|
|
|
|
/*
|
|
* Local queue is empty, but we still have PDUs
|
|
* in the main one; go around.
|
|
*/
|
|
if (STAILQ_EMPTY(&queue) &&
|
|
!STAILQ_EMPTY(&isc->to_send))
|
|
continue;
|
|
|
|
/*
|
|
* There might be some stuff in the local queue,
|
|
* which didn't get sent due to not having enough send
|
|
* space. Wait for socket upcall.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if (ic->ic_disconnecting) {
|
|
//ICL_DEBUG("terminating");
|
|
break;
|
|
}
|
|
|
|
cv_wait(&isc->send_cv, ic->ic_lock);
|
|
}
|
|
|
|
/*
|
|
* We're exiting; move PDUs back to the main queue, so they can
|
|
* get freed properly. At this point ordering doesn't matter.
|
|
*/
|
|
STAILQ_CONCAT(&isc->to_send, &queue);
|
|
|
|
isc->send_running = false;
|
|
cv_signal(&isc->send_cv);
|
|
ICL_CONN_UNLOCK(ic);
|
|
kthread_exit();
|
|
}
|
|
|
|
static int
|
|
icl_soupcall_send(struct socket *so, void *arg, int waitflag)
|
|
{
|
|
struct icl_soft_conn *isc;
|
|
struct icl_conn *ic;
|
|
|
|
if (!sowriteable(so))
|
|
return (SU_OK);
|
|
|
|
isc = arg;
|
|
ic = &isc->ic;
|
|
|
|
ICL_CONN_LOCK(ic);
|
|
isc->check_send_space = true;
|
|
ICL_CONN_UNLOCK(ic);
|
|
|
|
cv_signal(&isc->send_cv);
|
|
|
|
return (SU_OK);
|
|
}
|
|
|
|
static void
|
|
icl_soft_free_mext_pg(struct mbuf *m)
|
|
{
|
|
struct icl_soft_pdu *isp;
|
|
|
|
M_ASSERTEXTPG(m);
|
|
|
|
/*
|
|
* Nothing to do for the pages; they are owned by the PDU /
|
|
* I/O request.
|
|
*/
|
|
|
|
/* Drop reference on the PDU. */
|
|
isp = m->m_ext.ext_arg1;
|
|
if (atomic_fetchadd_int(&isp->ref_cnt, -1) == 1)
|
|
icl_soft_pdu_call_cb(&isp->ip);
|
|
}
|
|
|
|
static int
|
|
icl_soft_conn_pdu_append_bio(struct icl_conn *ic, struct icl_pdu *request,
|
|
struct bio *bp, size_t offset, size_t len, int flags)
|
|
{
|
|
struct icl_soft_pdu *isp = (struct icl_soft_pdu *)request;
|
|
struct mbuf *m, *m_tail;
|
|
vm_offset_t vaddr;
|
|
size_t mtodo, page_offset, todo;
|
|
int i;
|
|
|
|
KASSERT(len > 0, ("len == 0"));
|
|
|
|
m_tail = request->ip_data_mbuf;
|
|
if (m_tail != NULL)
|
|
for (; m_tail->m_next != NULL; m_tail = m_tail->m_next)
|
|
;
|
|
|
|
MPASS(bp->bio_flags & BIO_UNMAPPED);
|
|
if (offset < PAGE_SIZE - bp->bio_ma_offset) {
|
|
page_offset = bp->bio_ma_offset + offset;
|
|
i = 0;
|
|
} else {
|
|
offset -= PAGE_SIZE - bp->bio_ma_offset;
|
|
for (i = 1; offset >= PAGE_SIZE; i++)
|
|
offset -= PAGE_SIZE;
|
|
page_offset = offset;
|
|
}
|
|
|
|
if (flags & ICL_NOCOPY) {
|
|
m = NULL;
|
|
while (len > 0) {
|
|
if (m == NULL) {
|
|
m = mb_alloc_ext_pgs(flags & ~ICL_NOCOPY,
|
|
icl_soft_free_mext_pg);
|
|
if (__predict_false(m == NULL))
|
|
return (ENOMEM);
|
|
atomic_add_int(&isp->ref_cnt, 1);
|
|
m->m_ext.ext_arg1 = isp;
|
|
m->m_epg_1st_off = page_offset;
|
|
}
|
|
|
|
todo = MIN(len, PAGE_SIZE - page_offset);
|
|
|
|
m->m_epg_pa[m->m_epg_npgs] =
|
|
VM_PAGE_TO_PHYS(bp->bio_ma[i]);
|
|
m->m_epg_npgs++;
|
|
m->m_epg_last_len = todo;
|
|
m->m_len += todo;
|
|
m->m_ext.ext_size += PAGE_SIZE;
|
|
MBUF_EXT_PGS_ASSERT_SANITY(m);
|
|
|
|
if (m->m_epg_npgs == MBUF_PEXT_MAX_PGS) {
|
|
if (m_tail != NULL)
|
|
m_tail->m_next = m;
|
|
else
|
|
request->ip_data_mbuf = m;
|
|
m_tail = m;
|
|
request->ip_data_len += m->m_len;
|
|
m = NULL;
|
|
}
|
|
|
|
page_offset = 0;
|
|
len -= todo;
|
|
i++;
|
|
}
|
|
|
|
if (m != NULL) {
|
|
if (m_tail != NULL)
|
|
m_tail->m_next = m;
|
|
else
|
|
request->ip_data_mbuf = m;
|
|
request->ip_data_len += m->m_len;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
m = m_getm2(NULL, len, flags, MT_DATA, 0);
|
|
if (__predict_false(m == NULL))
|
|
return (ENOMEM);
|
|
|
|
if (request->ip_data_mbuf == NULL) {
|
|
request->ip_data_mbuf = m;
|
|
request->ip_data_len = len;
|
|
} else {
|
|
m_tail->m_next = m;
|
|
request->ip_data_len += len;
|
|
}
|
|
|
|
while (len > 0) {
|
|
todo = MIN(len, PAGE_SIZE - page_offset);
|
|
vaddr = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(bp->bio_ma[i]));
|
|
|
|
do {
|
|
mtodo = min(todo, M_SIZE(m) - m->m_len);
|
|
memcpy(mtod(m, char *) + m->m_len, (char *)vaddr +
|
|
page_offset, mtodo);
|
|
m->m_len += mtodo;
|
|
if (m->m_len == M_SIZE(m))
|
|
m = m->m_next;
|
|
page_offset += mtodo;
|
|
todo -= mtodo;
|
|
} while (todo > 0);
|
|
|
|
page_offset = 0;
|
|
len -= todo;
|
|
i++;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icl_soft_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *request,
|
|
const void *addr, size_t len, int flags)
|
|
{
|
|
struct icl_soft_pdu *isp = (struct icl_soft_pdu *)request;
|
|
struct mbuf *mb, *newmb;
|
|
size_t copylen, off = 0;
|
|
|
|
KASSERT(len > 0, ("len == 0"));
|
|
|
|
if (flags & ICL_NOCOPY) {
|
|
newmb = m_get(flags & ~ICL_NOCOPY, MT_DATA);
|
|
if (newmb == NULL) {
|
|
ICL_WARN("failed to allocate mbuf");
|
|
return (ENOMEM);
|
|
}
|
|
|
|
newmb->m_flags |= M_RDONLY;
|
|
m_extaddref(newmb, __DECONST(char *, addr), len, &isp->ref_cnt,
|
|
icl_soft_mbuf_done, isp, NULL);
|
|
newmb->m_len = len;
|
|
} else {
|
|
newmb = m_getm2(NULL, len, flags, MT_DATA, 0);
|
|
if (newmb == NULL) {
|
|
ICL_WARN("failed to allocate mbuf for %zd bytes", len);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
for (mb = newmb; mb != NULL; mb = mb->m_next) {
|
|
copylen = min(M_TRAILINGSPACE(mb), len - off);
|
|
memcpy(mtod(mb, char *), (const char *)addr + off, copylen);
|
|
mb->m_len = copylen;
|
|
off += copylen;
|
|
}
|
|
KASSERT(off == len, ("%s: off != len", __func__));
|
|
}
|
|
|
|
if (request->ip_data_mbuf == NULL) {
|
|
request->ip_data_mbuf = newmb;
|
|
request->ip_data_len = len;
|
|
} else {
|
|
m_cat(request->ip_data_mbuf, newmb);
|
|
request->ip_data_len += len;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
icl_soft_conn_pdu_get_bio(struct icl_conn *ic, struct icl_pdu *ip,
|
|
size_t pdu_off, struct bio *bp, size_t bio_off, size_t len)
|
|
{
|
|
vm_offset_t vaddr;
|
|
size_t page_offset, todo;
|
|
int i __unused;
|
|
|
|
MPASS(bp->bio_flags & BIO_UNMAPPED);
|
|
if (bio_off < PAGE_SIZE - bp->bio_ma_offset) {
|
|
page_offset = bp->bio_ma_offset + bio_off;
|
|
i = 0;
|
|
} else {
|
|
bio_off -= PAGE_SIZE - bp->bio_ma_offset;
|
|
for (i = 1; bio_off >= PAGE_SIZE; i++)
|
|
bio_off -= PAGE_SIZE;
|
|
page_offset = bio_off;
|
|
}
|
|
|
|
while (len > 0) {
|
|
todo = MIN(len, PAGE_SIZE - page_offset);
|
|
|
|
vaddr = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(bp->bio_ma[i]));
|
|
m_copydata(ip->ip_data_mbuf, pdu_off, todo, (char *)vaddr +
|
|
page_offset);
|
|
|
|
page_offset = 0;
|
|
pdu_off += todo;
|
|
len -= todo;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
void
|
|
icl_soft_conn_pdu_get_data(struct icl_conn *ic, struct icl_pdu *ip,
|
|
size_t off, void *addr, size_t len)
|
|
{
|
|
|
|
m_copydata(ip->ip_data_mbuf, off, len, addr);
|
|
}
|
|
|
|
static void
|
|
icl_soft_conn_pdu_queue(struct icl_conn *ic, struct icl_pdu *ip)
|
|
{
|
|
|
|
icl_soft_conn_pdu_queue_cb(ic, ip, NULL);
|
|
}
|
|
|
|
static void
|
|
icl_soft_conn_pdu_queue_cb(struct icl_conn *ic, struct icl_pdu *ip,
|
|
icl_pdu_cb cb)
|
|
{
|
|
struct icl_soft_conn *isc = (struct icl_soft_conn *)ic;
|
|
struct icl_soft_pdu *isp = (struct icl_soft_pdu *)ip;
|
|
|
|
ICL_CONN_LOCK_ASSERT(ic);
|
|
isp->ref_cnt++;
|
|
isp->cb = cb;
|
|
|
|
if (ic->ic_disconnecting || ic->ic_socket == NULL) {
|
|
ICL_DEBUG("icl_pdu_queue on closed connection");
|
|
icl_soft_pdu_done(ip, ENOTCONN);
|
|
return;
|
|
}
|
|
|
|
if (!STAILQ_EMPTY(&isc->to_send)) {
|
|
STAILQ_INSERT_TAIL(&isc->to_send, ip, ip_next);
|
|
/*
|
|
* If the queue is not empty, someone else had already
|
|
* signaled the send thread; no need to do that again,
|
|
* just return.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
STAILQ_INSERT_TAIL(&isc->to_send, ip, ip_next);
|
|
cv_signal(&isc->send_cv);
|
|
}
|
|
|
|
static struct icl_conn *
|
|
icl_soft_new_conn(const char *name, struct mtx *lock)
|
|
{
|
|
struct icl_soft_conn *isc;
|
|
struct icl_conn *ic;
|
|
|
|
refcount_acquire(&icl_ncons);
|
|
|
|
isc = (struct icl_soft_conn *)kobj_create(&icl_soft_class, M_ICL_SOFT,
|
|
M_WAITOK | M_ZERO);
|
|
|
|
STAILQ_INIT(&isc->to_send);
|
|
cv_init(&isc->send_cv, "icl_tx");
|
|
cv_init(&isc->receive_cv, "icl_rx");
|
|
|
|
ic = &isc->ic;
|
|
ic->ic_lock = lock;
|
|
#ifdef DIAGNOSTIC
|
|
refcount_init(&ic->ic_outstanding_pdus, 0);
|
|
#endif
|
|
ic->ic_name = name;
|
|
ic->ic_offload = "None";
|
|
ic->ic_unmapped = PMAP_HAS_DMAP;
|
|
|
|
return (ic);
|
|
}
|
|
|
|
void
|
|
icl_soft_conn_free(struct icl_conn *ic)
|
|
{
|
|
struct icl_soft_conn *isc = (struct icl_soft_conn *)ic;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
KASSERT(ic->ic_outstanding_pdus == 0,
|
|
("destroying session with %d outstanding PDUs",
|
|
ic->ic_outstanding_pdus));
|
|
#endif
|
|
cv_destroy(&isc->send_cv);
|
|
cv_destroy(&isc->receive_cv);
|
|
kobj_delete((struct kobj *)isc, M_ICL_SOFT);
|
|
refcount_release(&icl_ncons);
|
|
}
|
|
|
|
static int
|
|
icl_conn_start(struct icl_conn *ic)
|
|
{
|
|
struct icl_soft_conn *isc = (struct icl_soft_conn *)ic;
|
|
size_t minspace;
|
|
struct sockopt opt;
|
|
int error, one = 1;
|
|
|
|
ICL_CONN_LOCK(ic);
|
|
|
|
/*
|
|
* XXX: Ugly hack.
|
|
*/
|
|
if (ic->ic_socket == NULL) {
|
|
ICL_CONN_UNLOCK(ic);
|
|
return (EINVAL);
|
|
}
|
|
|
|
isc->receive_state = ICL_CONN_STATE_BHS;
|
|
isc->receive_len = sizeof(struct iscsi_bhs);
|
|
ic->ic_disconnecting = false;
|
|
|
|
ICL_CONN_UNLOCK(ic);
|
|
|
|
/*
|
|
* For sendspace, this is required because the current code cannot
|
|
* send a PDU in pieces; thus, the minimum buffer size is equal
|
|
* to the maximum PDU size. "+4" is to account for possible padding.
|
|
*/
|
|
minspace = sizeof(struct iscsi_bhs) +
|
|
ic->ic_max_send_data_segment_length +
|
|
ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4;
|
|
if (sendspace < minspace) {
|
|
ICL_WARN("kern.icl.sendspace too low; must be at least %zd",
|
|
minspace);
|
|
sendspace = minspace;
|
|
}
|
|
minspace = sizeof(struct iscsi_bhs) +
|
|
ic->ic_max_recv_data_segment_length +
|
|
ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4;
|
|
if (recvspace < minspace) {
|
|
ICL_WARN("kern.icl.recvspace too low; must be at least %zd",
|
|
minspace);
|
|
recvspace = minspace;
|
|
}
|
|
|
|
error = soreserve(ic->ic_socket, sendspace, recvspace);
|
|
if (error != 0) {
|
|
ICL_WARN("soreserve failed with error %d", error);
|
|
icl_soft_conn_close(ic);
|
|
return (error);
|
|
}
|
|
ic->ic_socket->so_snd.sb_flags |= SB_AUTOSIZE;
|
|
ic->ic_socket->so_rcv.sb_flags |= SB_AUTOSIZE;
|
|
|
|
/*
|
|
* Disable Nagle.
|
|
*/
|
|
bzero(&opt, sizeof(opt));
|
|
opt.sopt_dir = SOPT_SET;
|
|
opt.sopt_level = IPPROTO_TCP;
|
|
opt.sopt_name = TCP_NODELAY;
|
|
opt.sopt_val = &one;
|
|
opt.sopt_valsize = sizeof(one);
|
|
error = sosetopt(ic->ic_socket, &opt);
|
|
if (error != 0) {
|
|
ICL_WARN("disabling TCP_NODELAY failed with error %d", error);
|
|
icl_soft_conn_close(ic);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Register socket upcall, to get notified about incoming PDUs
|
|
* and free space to send outgoing ones.
|
|
*/
|
|
SOCKBUF_LOCK(&ic->ic_socket->so_snd);
|
|
soupcall_set(ic->ic_socket, SO_SND, icl_soupcall_send, isc);
|
|
SOCKBUF_UNLOCK(&ic->ic_socket->so_snd);
|
|
SOCKBUF_LOCK(&ic->ic_socket->so_rcv);
|
|
soupcall_set(ic->ic_socket, SO_RCV, icl_soupcall_receive, isc);
|
|
SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv);
|
|
|
|
/*
|
|
* Start threads.
|
|
*/
|
|
ICL_CONN_LOCK(ic);
|
|
isc->send_running = isc->receive_running = true;
|
|
ICL_CONN_UNLOCK(ic);
|
|
error = kthread_add(icl_send_thread, ic, NULL, NULL, 0, 0, "%stx",
|
|
ic->ic_name);
|
|
if (error != 0) {
|
|
ICL_WARN("kthread_add(9) failed with error %d", error);
|
|
ICL_CONN_LOCK(ic);
|
|
isc->send_running = isc->receive_running = false;
|
|
cv_signal(&isc->send_cv);
|
|
ICL_CONN_UNLOCK(ic);
|
|
icl_soft_conn_close(ic);
|
|
return (error);
|
|
}
|
|
error = kthread_add(icl_receive_thread, ic, NULL, NULL, 0, 0, "%srx",
|
|
ic->ic_name);
|
|
if (error != 0) {
|
|
ICL_WARN("kthread_add(9) failed with error %d", error);
|
|
ICL_CONN_LOCK(ic);
|
|
isc->receive_running = false;
|
|
cv_signal(&isc->send_cv);
|
|
ICL_CONN_UNLOCK(ic);
|
|
icl_soft_conn_close(ic);
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
icl_soft_conn_handoff(struct icl_conn *ic, int fd)
|
|
{
|
|
struct file *fp;
|
|
struct socket *so;
|
|
cap_rights_t rights;
|
|
int error;
|
|
|
|
ICL_CONN_LOCK_ASSERT_NOT(ic);
|
|
|
|
#ifdef ICL_KERNEL_PROXY
|
|
/*
|
|
* We're transitioning to Full Feature phase, and we don't
|
|
* really care.
|
|
*/
|
|
if (fd == 0) {
|
|
ICL_CONN_LOCK(ic);
|
|
if (ic->ic_socket == NULL) {
|
|
ICL_CONN_UNLOCK(ic);
|
|
ICL_WARN("proxy handoff without connect");
|
|
return (EINVAL);
|
|
}
|
|
ICL_CONN_UNLOCK(ic);
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Steal the socket from userland.
|
|
*/
|
|
error = fget(curthread, fd,
|
|
cap_rights_init_one(&rights, CAP_SOCK_CLIENT), &fp);
|
|
if (error != 0)
|
|
return (error);
|
|
if (fp->f_type != DTYPE_SOCKET) {
|
|
fdrop(fp, curthread);
|
|
return (EINVAL);
|
|
}
|
|
so = fp->f_data;
|
|
if (so->so_type != SOCK_STREAM) {
|
|
fdrop(fp, curthread);
|
|
return (EINVAL);
|
|
}
|
|
|
|
ICL_CONN_LOCK(ic);
|
|
|
|
if (ic->ic_socket != NULL) {
|
|
ICL_CONN_UNLOCK(ic);
|
|
fdrop(fp, curthread);
|
|
return (EBUSY);
|
|
}
|
|
|
|
ic->ic_socket = fp->f_data;
|
|
fp->f_ops = &badfileops;
|
|
fp->f_data = NULL;
|
|
fdrop(fp, curthread);
|
|
ICL_CONN_UNLOCK(ic);
|
|
|
|
error = icl_conn_start(ic);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
icl_soft_conn_close(struct icl_conn *ic)
|
|
{
|
|
struct icl_soft_conn *isc = (struct icl_soft_conn *)ic;
|
|
struct icl_pdu *pdu;
|
|
struct socket *so;
|
|
|
|
/*
|
|
* Wake up the threads, so they can properly terminate.
|
|
* Receive thread sleeps on so->so_rcv lock, send on ic->ic_lock.
|
|
*/
|
|
ICL_CONN_LOCK(ic);
|
|
if (!ic->ic_disconnecting) {
|
|
so = ic->ic_socket;
|
|
if (so)
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
ic->ic_disconnecting = true;
|
|
if (so)
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
}
|
|
while (isc->receive_running || isc->send_running) {
|
|
cv_signal(&isc->receive_cv);
|
|
cv_signal(&isc->send_cv);
|
|
cv_wait(&isc->send_cv, ic->ic_lock);
|
|
}
|
|
|
|
/* Some other thread could close the connection same time. */
|
|
so = ic->ic_socket;
|
|
if (so == NULL) {
|
|
ICL_CONN_UNLOCK(ic);
|
|
return;
|
|
}
|
|
ic->ic_socket = NULL;
|
|
|
|
/*
|
|
* Deregister socket upcalls.
|
|
*/
|
|
ICL_CONN_UNLOCK(ic);
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
if (so->so_snd.sb_upcall != NULL)
|
|
soupcall_clear(so, SO_SND);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (so->so_rcv.sb_upcall != NULL)
|
|
soupcall_clear(so, SO_RCV);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
soclose(so);
|
|
ICL_CONN_LOCK(ic);
|
|
|
|
if (isc->receive_pdu != NULL) {
|
|
//ICL_DEBUG("freeing partially received PDU");
|
|
icl_soft_conn_pdu_free(ic, isc->receive_pdu);
|
|
isc->receive_pdu = NULL;
|
|
}
|
|
|
|
/*
|
|
* Remove any outstanding PDUs from the send queue.
|
|
*/
|
|
while (!STAILQ_EMPTY(&isc->to_send)) {
|
|
pdu = STAILQ_FIRST(&isc->to_send);
|
|
STAILQ_REMOVE_HEAD(&isc->to_send, ip_next);
|
|
icl_soft_pdu_done(pdu, ENOTCONN);
|
|
}
|
|
|
|
KASSERT(STAILQ_EMPTY(&isc->to_send),
|
|
("destroying session with non-empty send queue"));
|
|
ICL_CONN_UNLOCK(ic);
|
|
}
|
|
|
|
int
|
|
icl_soft_conn_task_setup(struct icl_conn *ic, struct icl_pdu *ip,
|
|
struct ccb_scsiio *csio, uint32_t *task_tagp, void **prvp)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
icl_soft_conn_task_done(struct icl_conn *ic, void *prv)
|
|
{
|
|
}
|
|
|
|
int
|
|
icl_soft_conn_transfer_setup(struct icl_conn *ic, struct icl_pdu *ip,
|
|
union ctl_io *io, uint32_t *transfer_tag, void **prvp)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
icl_soft_conn_transfer_done(struct icl_conn *ic, void *prv)
|
|
{
|
|
}
|
|
|
|
static int
|
|
icl_soft_limits(struct icl_drv_limits *idl, int socket)
|
|
{
|
|
|
|
idl->idl_max_recv_data_segment_length = max_data_segment_length;
|
|
idl->idl_max_send_data_segment_length = max_data_segment_length;
|
|
idl->idl_max_burst_length = max_burst_length;
|
|
idl->idl_first_burst_length = first_burst_length;
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef ICL_KERNEL_PROXY
|
|
int
|
|
icl_soft_conn_connect(struct icl_conn *ic, int domain, int socktype,
|
|
int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
|
|
{
|
|
|
|
return (icl_soft_proxy_connect(ic, domain, socktype, protocol,
|
|
from_sa, to_sa));
|
|
}
|
|
|
|
int
|
|
icl_soft_handoff_sock(struct icl_conn *ic, struct socket *so)
|
|
{
|
|
int error;
|
|
|
|
ICL_CONN_LOCK_ASSERT_NOT(ic);
|
|
|
|
if (so->so_type != SOCK_STREAM)
|
|
return (EINVAL);
|
|
|
|
ICL_CONN_LOCK(ic);
|
|
if (ic->ic_socket != NULL) {
|
|
ICL_CONN_UNLOCK(ic);
|
|
return (EBUSY);
|
|
}
|
|
ic->ic_socket = so;
|
|
ICL_CONN_UNLOCK(ic);
|
|
|
|
error = icl_conn_start(ic);
|
|
|
|
return (error);
|
|
}
|
|
#endif /* ICL_KERNEL_PROXY */
|
|
|
|
static int
|
|
icl_soft_load(void)
|
|
{
|
|
int error;
|
|
|
|
icl_soft_pdu_zone = uma_zcreate("icl_soft_pdu",
|
|
sizeof(struct icl_soft_pdu), NULL, NULL, NULL, NULL,
|
|
UMA_ALIGN_PTR, 0);
|
|
refcount_init(&icl_ncons, 0);
|
|
|
|
/*
|
|
* The reason we call this "none" is that to the user,
|
|
* it's known as "offload driver"; "offload driver: soft"
|
|
* doesn't make much sense.
|
|
*/
|
|
error = icl_register("none", false, 0,
|
|
icl_soft_limits, icl_soft_new_conn);
|
|
KASSERT(error == 0, ("failed to register"));
|
|
|
|
#if defined(ICL_KERNEL_PROXY) && 0
|
|
/*
|
|
* Debugging aid for kernel proxy functionality.
|
|
*/
|
|
error = icl_register("proxytest", true, 0,
|
|
icl_soft_limits, icl_soft_new_conn);
|
|
KASSERT(error == 0, ("failed to register"));
|
|
#endif
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
icl_soft_unload(void)
|
|
{
|
|
|
|
if (icl_ncons != 0)
|
|
return (EBUSY);
|
|
|
|
icl_unregister("none", false);
|
|
#if defined(ICL_KERNEL_PROXY) && 0
|
|
icl_unregister("proxytest", true);
|
|
#endif
|
|
|
|
uma_zdestroy(icl_soft_pdu_zone);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icl_soft_modevent(module_t mod, int what, void *arg)
|
|
{
|
|
|
|
switch (what) {
|
|
case MOD_LOAD:
|
|
return (icl_soft_load());
|
|
case MOD_UNLOAD:
|
|
return (icl_soft_unload());
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
moduledata_t icl_soft_data = {
|
|
"icl_soft",
|
|
icl_soft_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(icl_soft, icl_soft_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
|
|
MODULE_DEPEND(icl_soft, icl, 1, 1, 1);
|
|
MODULE_VERSION(icl_soft, 1);
|