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freebsd-nq/sys/cam/ctl/ctl_frontend_iscsi.c
Alexander Motin 8a1cd3cee3 Add session locking in cfiscsi_ioctl_handoff(). 
While there, remove ifdef around cs_target check in cfiscsi_ioctl_list().
I am not sure why this ifdef was added, but without this check code will
crash below on NULL dereference.

Submitted by:	Aleksandr Fedorov <aleksandr.fedorov@itglobal.com>
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D24587
2020-05-03 16:14:55 +00:00

3025 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* CTL frontend for the iSCSI protocol.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/condvar.h>
#include <sys/endian.h>
#include <sys/file.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/unistd.h>
#include <sys/nv.h>
#include <sys/dnv.h>
#include <vm/uma.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_da.h>
#include <cam/ctl/ctl_io.h>
#include <cam/ctl/ctl.h>
#include <cam/ctl/ctl_backend.h>
#include <cam/ctl/ctl_error.h>
#include <cam/ctl/ctl_frontend.h>
#include <cam/ctl/ctl_debug.h>
#include <cam/ctl/ctl_ha.h>
#include <cam/ctl/ctl_ioctl.h>
#include <cam/ctl/ctl_private.h>
#include <dev/iscsi/icl.h>
#include <dev/iscsi/icl_wrappers.h>
#include <dev/iscsi/iscsi_proto.h>
#include <cam/ctl/ctl_frontend_iscsi.h>
#ifdef ICL_KERNEL_PROXY
#include <sys/socketvar.h>
#endif
#ifdef ICL_KERNEL_PROXY
FEATURE(cfiscsi_kernel_proxy, "iSCSI target built with ICL_KERNEL_PROXY");
#endif
static MALLOC_DEFINE(M_CFISCSI, "cfiscsi", "Memory used for CTL iSCSI frontend");
static uma_zone_t cfiscsi_data_wait_zone;
SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, iscsi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"CAM Target Layer iSCSI Frontend");
static int debug = 1;
SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN,
&debug, 1, "Enable debug messages");
static int ping_timeout = 5;
SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN,
&ping_timeout, 5, "Interval between ping (NOP-Out) requests, in seconds");
static int login_timeout = 60;
SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN,
&login_timeout, 60, "Time to wait for ctld(8) to finish Login Phase, in seconds");
static int maxtags = 256;
SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN,
&maxtags, 0, "Max number of requests queued by initiator");
#define CFISCSI_DEBUG(X, ...) \
do { \
if (debug > 1) { \
printf("%s: " X "\n", \
__func__, ## __VA_ARGS__); \
} \
} while (0)
#define CFISCSI_WARN(X, ...) \
do { \
if (debug > 0) { \
printf("WARNING: %s: " X "\n", \
__func__, ## __VA_ARGS__); \
} \
} while (0)
#define CFISCSI_SESSION_DEBUG(S, X, ...) \
do { \
if (debug > 1) { \
printf("%s: %s (%s): " X "\n", \
__func__, S->cs_initiator_addr, \
S->cs_initiator_name, ## __VA_ARGS__); \
} \
} while (0)
#define CFISCSI_SESSION_WARN(S, X, ...) \
do { \
if (debug > 0) { \
printf("WARNING: %s (%s): " X "\n", \
S->cs_initiator_addr, \
S->cs_initiator_name, ## __VA_ARGS__); \
} \
} while (0)
#define CFISCSI_SESSION_LOCK(X) mtx_lock(&X->cs_lock)
#define CFISCSI_SESSION_UNLOCK(X) mtx_unlock(&X->cs_lock)
#define CFISCSI_SESSION_LOCK_ASSERT(X) mtx_assert(&X->cs_lock, MA_OWNED)
#define CONN_SESSION(X) ((struct cfiscsi_session *)(X)->ic_prv0)
#define PDU_SESSION(X) CONN_SESSION((X)->ip_conn)
#define PDU_EXPDATASN(X) (X)->ip_prv0
#define PDU_TOTAL_TRANSFER_LEN(X) (X)->ip_prv1
#define PDU_R2TSN(X) (X)->ip_prv2
static int cfiscsi_init(void);
static int cfiscsi_shutdown(void);
static void cfiscsi_online(void *arg);
static void cfiscsi_offline(void *arg);
static int cfiscsi_info(void *arg, struct sbuf *sb);
static int cfiscsi_ioctl(struct cdev *dev,
u_long cmd, caddr_t addr, int flag, struct thread *td);
static void cfiscsi_datamove(union ctl_io *io);
static void cfiscsi_datamove_in(union ctl_io *io);
static void cfiscsi_datamove_out(union ctl_io *io);
static void cfiscsi_done(union ctl_io *io);
static bool cfiscsi_pdu_update_cmdsn(const struct icl_pdu *request);
static void cfiscsi_pdu_handle_nop_out(struct icl_pdu *request);
static void cfiscsi_pdu_handle_scsi_command(struct icl_pdu *request);
static void cfiscsi_pdu_handle_task_request(struct icl_pdu *request);
static void cfiscsi_pdu_handle_data_out(struct icl_pdu *request);
static void cfiscsi_pdu_handle_logout_request(struct icl_pdu *request);
static void cfiscsi_session_terminate(struct cfiscsi_session *cs);
static struct cfiscsi_data_wait *cfiscsi_data_wait_new(
struct cfiscsi_session *cs, union ctl_io *io,
uint32_t initiator_task_tag,
uint32_t *target_transfer_tagp);
static void cfiscsi_data_wait_free(struct cfiscsi_session *cs,
struct cfiscsi_data_wait *cdw);
static struct cfiscsi_target *cfiscsi_target_find(struct cfiscsi_softc
*softc, const char *name, uint16_t tag);
static struct cfiscsi_target *cfiscsi_target_find_or_create(
struct cfiscsi_softc *softc, const char *name, const char *alias,
uint16_t tag);
static void cfiscsi_target_release(struct cfiscsi_target *ct);
static void cfiscsi_session_delete(struct cfiscsi_session *cs);
static struct cfiscsi_softc cfiscsi_softc;
static struct ctl_frontend cfiscsi_frontend =
{
.name = "iscsi",
.init = cfiscsi_init,
.ioctl = cfiscsi_ioctl,
.shutdown = cfiscsi_shutdown,
};
CTL_FRONTEND_DECLARE(cfiscsi, cfiscsi_frontend);
MODULE_DEPEND(cfiscsi, icl, 1, 1, 1);
static struct icl_pdu *
cfiscsi_pdu_new_response(struct icl_pdu *request, int flags)
{
return (icl_pdu_new(request->ip_conn, flags));
}
static bool
cfiscsi_pdu_update_cmdsn(const struct icl_pdu *request)
{
const struct iscsi_bhs_scsi_command *bhssc;
struct cfiscsi_session *cs;
uint32_t cmdsn, expstatsn;
cs = PDU_SESSION(request);
/*
* Every incoming PDU - not just NOP-Out - resets the ping timer.
* The purpose of the timeout is to reset the connection when it stalls;
* we don't want this to happen when NOP-In or NOP-Out ends up delayed
* in some queue.
*
* XXX: Locking?
*/
cs->cs_timeout = 0;
/*
* Data-Out PDUs don't contain CmdSN.
*/
if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_DATA_OUT)
return (false);
/*
* We're only using fields common for all the request
* (initiator -> target) PDUs.
*/
bhssc = (const struct iscsi_bhs_scsi_command *)request->ip_bhs;
cmdsn = ntohl(bhssc->bhssc_cmdsn);
expstatsn = ntohl(bhssc->bhssc_expstatsn);
CFISCSI_SESSION_LOCK(cs);
#if 0
if (expstatsn != cs->cs_statsn) {
CFISCSI_SESSION_DEBUG(cs, "received PDU with ExpStatSN %d, "
"while current StatSN is %d", expstatsn,
cs->cs_statsn);
}
#endif
if ((request->ip_bhs->bhs_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) {
/*
* The target MUST silently ignore any non-immediate command
* outside of this range.
*/
if (ISCSI_SNLT(cmdsn, cs->cs_cmdsn) ||
ISCSI_SNGT(cmdsn, cs->cs_cmdsn - 1 + maxtags)) {
CFISCSI_SESSION_UNLOCK(cs);
CFISCSI_SESSION_WARN(cs, "received PDU with CmdSN %u, "
"while expected %u", cmdsn, cs->cs_cmdsn);
return (true);
}
/*
* We don't support multiple connections now, so any
* discontinuity in CmdSN means lost PDUs. Since we don't
* support PDU retransmission -- terminate the connection.
*/
if (cmdsn != cs->cs_cmdsn) {
CFISCSI_SESSION_UNLOCK(cs);
CFISCSI_SESSION_WARN(cs, "received PDU with CmdSN %u, "
"while expected %u; dropping connection",
cmdsn, cs->cs_cmdsn);
cfiscsi_session_terminate(cs);
return (true);
}
cs->cs_cmdsn++;
}
CFISCSI_SESSION_UNLOCK(cs);
return (false);
}
static void
cfiscsi_pdu_handle(struct icl_pdu *request)
{
struct cfiscsi_session *cs;
bool ignore;
cs = PDU_SESSION(request);
ignore = cfiscsi_pdu_update_cmdsn(request);
if (ignore) {
icl_pdu_free(request);
return;
}
/*
* Handle the PDU; this includes e.g. receiving the remaining
* part of PDU and submitting the SCSI command to CTL
* or queueing a reply. The handling routine is responsible
* for freeing the PDU when it's no longer needed.
*/
switch (request->ip_bhs->bhs_opcode &
~ISCSI_BHS_OPCODE_IMMEDIATE) {
case ISCSI_BHS_OPCODE_NOP_OUT:
cfiscsi_pdu_handle_nop_out(request);
break;
case ISCSI_BHS_OPCODE_SCSI_COMMAND:
cfiscsi_pdu_handle_scsi_command(request);
break;
case ISCSI_BHS_OPCODE_TASK_REQUEST:
cfiscsi_pdu_handle_task_request(request);
break;
case ISCSI_BHS_OPCODE_SCSI_DATA_OUT:
cfiscsi_pdu_handle_data_out(request);
break;
case ISCSI_BHS_OPCODE_LOGOUT_REQUEST:
cfiscsi_pdu_handle_logout_request(request);
break;
default:
CFISCSI_SESSION_WARN(cs, "received PDU with unsupported "
"opcode 0x%x; dropping connection",
request->ip_bhs->bhs_opcode);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
}
}
static void
cfiscsi_receive_callback(struct icl_pdu *request)
{
#ifdef ICL_KERNEL_PROXY
struct cfiscsi_session *cs;
cs = PDU_SESSION(request);
if (cs->cs_waiting_for_ctld || cs->cs_login_phase) {
if (cs->cs_login_pdu == NULL)
cs->cs_login_pdu = request;
else
icl_pdu_free(request);
cv_signal(&cs->cs_login_cv);
return;
}
#endif
cfiscsi_pdu_handle(request);
}
static void
cfiscsi_error_callback(struct icl_conn *ic)
{
struct cfiscsi_session *cs;
cs = CONN_SESSION(ic);
CFISCSI_SESSION_WARN(cs, "connection error; dropping connection");
cfiscsi_session_terminate(cs);
}
static int
cfiscsi_pdu_prepare(struct icl_pdu *response)
{
struct cfiscsi_session *cs;
struct iscsi_bhs_scsi_response *bhssr;
bool advance_statsn = true;
cs = PDU_SESSION(response);
CFISCSI_SESSION_LOCK_ASSERT(cs);
/*
* We're only using fields common for all the response
* (target -> initiator) PDUs.
*/
bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
/*
* 10.8.3: "The StatSN for this connection is not advanced
* after this PDU is sent."
*/
if (bhssr->bhssr_opcode == ISCSI_BHS_OPCODE_R2T)
advance_statsn = false;
/*
* 10.19.2: "However, when the Initiator Task Tag is set to 0xffffffff,
* StatSN for the connection is not advanced after this PDU is sent."
*/
if (bhssr->bhssr_opcode == ISCSI_BHS_OPCODE_NOP_IN &&
bhssr->bhssr_initiator_task_tag == 0xffffffff)
advance_statsn = false;
/*
* See the comment below - StatSN is not meaningful and must
* not be advanced.
*/
if (bhssr->bhssr_opcode == ISCSI_BHS_OPCODE_SCSI_DATA_IN &&
(bhssr->bhssr_flags & BHSDI_FLAGS_S) == 0)
advance_statsn = false;
/*
* 10.7.3: "The fields StatSN, Status, and Residual Count
* only have meaningful content if the S bit is set to 1."
*/
if (bhssr->bhssr_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN ||
(bhssr->bhssr_flags & BHSDI_FLAGS_S))
bhssr->bhssr_statsn = htonl(cs->cs_statsn);
bhssr->bhssr_expcmdsn = htonl(cs->cs_cmdsn);
bhssr->bhssr_maxcmdsn = htonl(cs->cs_cmdsn - 1 +
imax(0, maxtags - cs->cs_outstanding_ctl_pdus));
if (advance_statsn)
cs->cs_statsn++;
return (0);
}
static void
cfiscsi_pdu_queue(struct icl_pdu *response)
{
struct cfiscsi_session *cs;
cs = PDU_SESSION(response);
CFISCSI_SESSION_LOCK(cs);
cfiscsi_pdu_prepare(response);
icl_pdu_queue(response);
CFISCSI_SESSION_UNLOCK(cs);
}
static void
cfiscsi_pdu_handle_nop_out(struct icl_pdu *request)
{
struct cfiscsi_session *cs;
struct iscsi_bhs_nop_out *bhsno;
struct iscsi_bhs_nop_in *bhsni;
struct icl_pdu *response;
void *data = NULL;
size_t datasize;
int error;
cs = PDU_SESSION(request);
bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
if (bhsno->bhsno_initiator_task_tag == 0xffffffff) {
/*
* Nothing to do, iscsi_pdu_update_statsn() already
* zeroed the timeout.
*/
icl_pdu_free(request);
return;
}
datasize = icl_pdu_data_segment_length(request);
if (datasize > 0) {
data = malloc(datasize, M_CFISCSI, M_NOWAIT | M_ZERO);
if (data == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
"dropping connection");
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
icl_pdu_get_data(request, 0, data, datasize);
}
response = cfiscsi_pdu_new_response(request, M_NOWAIT);
if (response == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
"droppping connection");
free(data, M_CFISCSI);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs;
bhsni->bhsni_opcode = ISCSI_BHS_OPCODE_NOP_IN;
bhsni->bhsni_flags = 0x80;
bhsni->bhsni_initiator_task_tag = bhsno->bhsno_initiator_task_tag;
bhsni->bhsni_target_transfer_tag = 0xffffffff;
if (datasize > 0) {
error = icl_pdu_append_data(response, data, datasize, M_NOWAIT);
if (error != 0) {
CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
"dropping connection");
free(data, M_CFISCSI);
icl_pdu_free(request);
icl_pdu_free(response);
cfiscsi_session_terminate(cs);
return;
}
free(data, M_CFISCSI);
}
icl_pdu_free(request);
cfiscsi_pdu_queue(response);
}
static void
cfiscsi_pdu_handle_scsi_command(struct icl_pdu *request)
{
struct iscsi_bhs_scsi_command *bhssc;
struct cfiscsi_session *cs;
union ctl_io *io;
int error;
cs = PDU_SESSION(request);
bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
//CFISCSI_SESSION_DEBUG(cs, "initiator task tag 0x%x",
// bhssc->bhssc_initiator_task_tag);
if (request->ip_data_len > 0 && cs->cs_immediate_data == false) {
CFISCSI_SESSION_WARN(cs, "unsolicited data with "
"ImmediateData=No; dropping connection");
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
io = ctl_alloc_io(cs->cs_target->ct_port.ctl_pool_ref);
ctl_zero_io(io);
io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = request;
io->io_hdr.io_type = CTL_IO_SCSI;
io->io_hdr.nexus.initid = cs->cs_ctl_initid;
io->io_hdr.nexus.targ_port = cs->cs_target->ct_port.targ_port;
io->io_hdr.nexus.targ_lun = ctl_decode_lun(be64toh(bhssc->bhssc_lun));
io->scsiio.tag_num = bhssc->bhssc_initiator_task_tag;
switch ((bhssc->bhssc_flags & BHSSC_FLAGS_ATTR)) {
case BHSSC_FLAGS_ATTR_UNTAGGED:
io->scsiio.tag_type = CTL_TAG_UNTAGGED;
break;
case BHSSC_FLAGS_ATTR_SIMPLE:
io->scsiio.tag_type = CTL_TAG_SIMPLE;
break;
case BHSSC_FLAGS_ATTR_ORDERED:
io->scsiio.tag_type = CTL_TAG_ORDERED;
break;
case BHSSC_FLAGS_ATTR_HOQ:
io->scsiio.tag_type = CTL_TAG_HEAD_OF_QUEUE;
break;
case BHSSC_FLAGS_ATTR_ACA:
io->scsiio.tag_type = CTL_TAG_ACA;
break;
default:
io->scsiio.tag_type = CTL_TAG_UNTAGGED;
CFISCSI_SESSION_WARN(cs, "unhandled tag type %d",
bhssc->bhssc_flags & BHSSC_FLAGS_ATTR);
break;
}
io->scsiio.cdb_len = sizeof(bhssc->bhssc_cdb); /* Which is 16. */
memcpy(io->scsiio.cdb, bhssc->bhssc_cdb, sizeof(bhssc->bhssc_cdb));
refcount_acquire(&cs->cs_outstanding_ctl_pdus);
error = ctl_queue(io);
if (error != CTL_RETVAL_COMPLETE) {
CFISCSI_SESSION_WARN(cs, "ctl_queue() failed; error %d; "
"dropping connection", error);
ctl_free_io(io);
refcount_release(&cs->cs_outstanding_ctl_pdus);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
}
}
static void
cfiscsi_pdu_handle_task_request(struct icl_pdu *request)
{
struct iscsi_bhs_task_management_request *bhstmr;
struct iscsi_bhs_task_management_response *bhstmr2;
struct icl_pdu *response;
struct cfiscsi_session *cs;
union ctl_io *io;
int error;
cs = PDU_SESSION(request);
bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
io = ctl_alloc_io(cs->cs_target->ct_port.ctl_pool_ref);
ctl_zero_io(io);
io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = request;
io->io_hdr.io_type = CTL_IO_TASK;
io->io_hdr.nexus.initid = cs->cs_ctl_initid;
io->io_hdr.nexus.targ_port = cs->cs_target->ct_port.targ_port;
io->io_hdr.nexus.targ_lun = ctl_decode_lun(be64toh(bhstmr->bhstmr_lun));
io->taskio.tag_type = CTL_TAG_SIMPLE; /* XXX */
switch (bhstmr->bhstmr_function & ~0x80) {
case BHSTMR_FUNCTION_ABORT_TASK:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_ABORT_TASK");
#endif
io->taskio.task_action = CTL_TASK_ABORT_TASK;
io->taskio.tag_num = bhstmr->bhstmr_referenced_task_tag;
break;
case BHSTMR_FUNCTION_ABORT_TASK_SET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_ABORT_TASK_SET");
#endif
io->taskio.task_action = CTL_TASK_ABORT_TASK_SET;
break;
case BHSTMR_FUNCTION_CLEAR_TASK_SET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_CLEAR_TASK_SET");
#endif
io->taskio.task_action = CTL_TASK_CLEAR_TASK_SET;
break;
case BHSTMR_FUNCTION_LOGICAL_UNIT_RESET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_LOGICAL_UNIT_RESET");
#endif
io->taskio.task_action = CTL_TASK_LUN_RESET;
break;
case BHSTMR_FUNCTION_TARGET_WARM_RESET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_TARGET_WARM_RESET");
#endif
io->taskio.task_action = CTL_TASK_TARGET_RESET;
break;
case BHSTMR_FUNCTION_TARGET_COLD_RESET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_TARGET_COLD_RESET");
#endif
io->taskio.task_action = CTL_TASK_TARGET_RESET;
break;
case BHSTMR_FUNCTION_QUERY_TASK:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_QUERY_TASK");
#endif
io->taskio.task_action = CTL_TASK_QUERY_TASK;
io->taskio.tag_num = bhstmr->bhstmr_referenced_task_tag;
break;
case BHSTMR_FUNCTION_QUERY_TASK_SET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_QUERY_TASK_SET");
#endif
io->taskio.task_action = CTL_TASK_QUERY_TASK_SET;
break;
case BHSTMR_FUNCTION_I_T_NEXUS_RESET:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_I_T_NEXUS_RESET");
#endif
io->taskio.task_action = CTL_TASK_I_T_NEXUS_RESET;
break;
case BHSTMR_FUNCTION_QUERY_ASYNC_EVENT:
#if 0
CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_QUERY_ASYNC_EVENT");
#endif
io->taskio.task_action = CTL_TASK_QUERY_ASYNC_EVENT;
break;
default:
CFISCSI_SESSION_DEBUG(cs, "unsupported function 0x%x",
bhstmr->bhstmr_function & ~0x80);
ctl_free_io(io);
response = cfiscsi_pdu_new_response(request, M_NOWAIT);
if (response == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
"dropping connection");
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
bhstmr2 = (struct iscsi_bhs_task_management_response *)
response->ip_bhs;
bhstmr2->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_RESPONSE;
bhstmr2->bhstmr_flags = 0x80;
bhstmr2->bhstmr_response =
BHSTMR_RESPONSE_FUNCTION_NOT_SUPPORTED;
bhstmr2->bhstmr_initiator_task_tag =
bhstmr->bhstmr_initiator_task_tag;
icl_pdu_free(request);
cfiscsi_pdu_queue(response);
return;
}
refcount_acquire(&cs->cs_outstanding_ctl_pdus);
error = ctl_queue(io);
if (error != CTL_RETVAL_COMPLETE) {
CFISCSI_SESSION_WARN(cs, "ctl_queue() failed; error %d; "
"dropping connection", error);
ctl_free_io(io);
refcount_release(&cs->cs_outstanding_ctl_pdus);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
}
}
static bool
cfiscsi_handle_data_segment(struct icl_pdu *request, struct cfiscsi_data_wait *cdw)
{
struct iscsi_bhs_data_out *bhsdo;
struct cfiscsi_session *cs;
struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
size_t copy_len, len, off, buffer_offset;
int ctl_sg_count;
union ctl_io *io;
cs = PDU_SESSION(request);
KASSERT((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_DATA_OUT ||
(request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_COMMAND,
("bad opcode 0x%x", request->ip_bhs->bhs_opcode));
/*
* We're only using fields common for Data-Out and SCSI Command PDUs.
*/
bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
io = cdw->cdw_ctl_io;
KASSERT((io->io_hdr.flags & CTL_FLAG_DATA_MASK) != CTL_FLAG_DATA_IN,
("CTL_FLAG_DATA_IN"));
#if 0
CFISCSI_SESSION_DEBUG(cs, "received %zd bytes out of %d",
request->ip_data_len, io->scsiio.kern_total_len);
#endif
if (io->scsiio.kern_sg_entries > 0) {
ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
ctl_sg_count = io->scsiio.kern_sg_entries;
} else {
ctl_sglist = &ctl_sg_entry;
ctl_sglist->addr = io->scsiio.kern_data_ptr;
ctl_sglist->len = io->scsiio.kern_data_len;
ctl_sg_count = 1;
}
if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_DATA_OUT)
buffer_offset = ntohl(bhsdo->bhsdo_buffer_offset);
else
buffer_offset = 0;
len = icl_pdu_data_segment_length(request);
/*
* Make sure the offset, as sent by the initiator, matches the offset
* we're supposed to be at in the scatter-gather list.
*/
if (buffer_offset >
io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled ||
buffer_offset + len <=
io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled) {
CFISCSI_SESSION_WARN(cs, "received bad buffer offset %zd, "
"expected %zd; dropping connection", buffer_offset,
(size_t)io->scsiio.kern_rel_offset +
(size_t)io->scsiio.ext_data_filled);
ctl_set_data_phase_error(&io->scsiio);
cfiscsi_session_terminate(cs);
return (true);
}
/*
* This is the offset within the PDU data segment, as opposed
* to buffer_offset, which is the offset within the task (SCSI
* command).
*/
off = io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled -
buffer_offset;
/*
* Iterate over the scatter/gather segments, filling them with data
* from the PDU data segment. Note that this can get called multiple
* times for one SCSI command; the cdw structure holds state for the
* scatter/gather list.
*/
for (;;) {
KASSERT(cdw->cdw_sg_index < ctl_sg_count,
("cdw->cdw_sg_index >= ctl_sg_count"));
if (cdw->cdw_sg_len == 0) {
cdw->cdw_sg_addr = ctl_sglist[cdw->cdw_sg_index].addr;
cdw->cdw_sg_len = ctl_sglist[cdw->cdw_sg_index].len;
}
KASSERT(off <= len, ("len > off"));
copy_len = len - off;
if (copy_len > cdw->cdw_sg_len)
copy_len = cdw->cdw_sg_len;
icl_pdu_get_data(request, off, cdw->cdw_sg_addr, copy_len);
cdw->cdw_sg_addr += copy_len;
cdw->cdw_sg_len -= copy_len;
off += copy_len;
io->scsiio.ext_data_filled += copy_len;
io->scsiio.kern_data_resid -= copy_len;
if (cdw->cdw_sg_len == 0) {
/*
* End of current segment.
*/
if (cdw->cdw_sg_index == ctl_sg_count - 1) {
/*
* Last segment in scatter/gather list.
*/
break;
}
cdw->cdw_sg_index++;
}
if (off == len) {
/*
* End of PDU payload.
*/
break;
}
}
if (len > off) {
/*
* In case of unsolicited data, it's possible that the buffer
* provided by CTL is smaller than negotiated FirstBurstLength.
* Just ignore the superfluous data; will ask for them with R2T
* on next call to cfiscsi_datamove().
*
* This obviously can only happen with SCSI Command PDU.
*/
if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_COMMAND)
return (true);
CFISCSI_SESSION_WARN(cs, "received too much data: got %zd bytes, "
"expected %zd; dropping connection",
icl_pdu_data_segment_length(request), off);
ctl_set_data_phase_error(&io->scsiio);
cfiscsi_session_terminate(cs);
return (true);
}
if (io->scsiio.ext_data_filled == cdw->cdw_r2t_end &&
(bhsdo->bhsdo_flags & BHSDO_FLAGS_F) == 0) {
CFISCSI_SESSION_WARN(cs, "got the final packet without "
"the F flag; flags = 0x%x; dropping connection",
bhsdo->bhsdo_flags);
ctl_set_data_phase_error(&io->scsiio);
cfiscsi_session_terminate(cs);
return (true);
}
if (io->scsiio.ext_data_filled != cdw->cdw_r2t_end &&
(bhsdo->bhsdo_flags & BHSDO_FLAGS_F) != 0) {
if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_DATA_OUT) {
CFISCSI_SESSION_WARN(cs, "got the final packet, but the "
"transmitted size was %zd bytes instead of %d; "
"dropping connection",
(size_t)io->scsiio.ext_data_filled,
cdw->cdw_r2t_end);
ctl_set_data_phase_error(&io->scsiio);
cfiscsi_session_terminate(cs);
return (true);
} else {
/*
* For SCSI Command PDU, this just means we need to
* solicit more data by sending R2T.
*/
return (false);
}
}
if (io->scsiio.ext_data_filled == cdw->cdw_r2t_end) {
#if 0
CFISCSI_SESSION_DEBUG(cs, "no longer expecting Data-Out with target "
"transfer tag 0x%x", cdw->cdw_target_transfer_tag);
#endif
return (true);
}
return (false);
}
static void
cfiscsi_pdu_handle_data_out(struct icl_pdu *request)
{
struct iscsi_bhs_data_out *bhsdo;
struct cfiscsi_session *cs;
struct cfiscsi_data_wait *cdw = NULL;
union ctl_io *io;
bool done;
cs = PDU_SESSION(request);
bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
CFISCSI_SESSION_LOCK(cs);
TAILQ_FOREACH(cdw, &cs->cs_waiting_for_data_out, cdw_next) {
#if 0
CFISCSI_SESSION_DEBUG(cs, "have ttt 0x%x, itt 0x%x; looking for "
"ttt 0x%x, itt 0x%x",
bhsdo->bhsdo_target_transfer_tag,
bhsdo->bhsdo_initiator_task_tag,
cdw->cdw_target_transfer_tag, cdw->cdw_initiator_task_tag));
#endif
if (bhsdo->bhsdo_target_transfer_tag ==
cdw->cdw_target_transfer_tag)
break;
}
CFISCSI_SESSION_UNLOCK(cs);
if (cdw == NULL) {
CFISCSI_SESSION_WARN(cs, "data transfer tag 0x%x, initiator task tag "
"0x%x, not found; dropping connection",
bhsdo->bhsdo_target_transfer_tag, bhsdo->bhsdo_initiator_task_tag);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
if (cdw->cdw_datasn != ntohl(bhsdo->bhsdo_datasn)) {
CFISCSI_SESSION_WARN(cs, "received Data-Out PDU with "
"DataSN %u, while expected %u; dropping connection",
ntohl(bhsdo->bhsdo_datasn), cdw->cdw_datasn);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
cdw->cdw_datasn++;
io = cdw->cdw_ctl_io;
KASSERT((io->io_hdr.flags & CTL_FLAG_DATA_MASK) != CTL_FLAG_DATA_IN,
("CTL_FLAG_DATA_IN"));
done = cfiscsi_handle_data_segment(request, cdw);
if (done) {
CFISCSI_SESSION_LOCK(cs);
TAILQ_REMOVE(&cs->cs_waiting_for_data_out, cdw, cdw_next);
CFISCSI_SESSION_UNLOCK(cs);
done = (io->scsiio.ext_data_filled != cdw->cdw_r2t_end ||
io->scsiio.ext_data_filled == io->scsiio.kern_data_len);
cfiscsi_data_wait_free(cs, cdw);
io->io_hdr.flags &= ~CTL_FLAG_DMA_INPROG;
if (done)
io->scsiio.be_move_done(io);
else
cfiscsi_datamove_out(io);
}
icl_pdu_free(request);
}
static void
cfiscsi_pdu_handle_logout_request(struct icl_pdu *request)
{
struct iscsi_bhs_logout_request *bhslr;
struct iscsi_bhs_logout_response *bhslr2;
struct icl_pdu *response;
struct cfiscsi_session *cs;
cs = PDU_SESSION(request);
bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs;
switch (bhslr->bhslr_reason & 0x7f) {
case BHSLR_REASON_CLOSE_SESSION:
case BHSLR_REASON_CLOSE_CONNECTION:
response = cfiscsi_pdu_new_response(request, M_NOWAIT);
if (response == NULL) {
CFISCSI_SESSION_DEBUG(cs, "failed to allocate memory");
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
bhslr2 = (struct iscsi_bhs_logout_response *)response->ip_bhs;
bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
bhslr2->bhslr_flags = 0x80;
bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY;
bhslr2->bhslr_initiator_task_tag =
bhslr->bhslr_initiator_task_tag;
icl_pdu_free(request);
cfiscsi_pdu_queue(response);
cfiscsi_session_terminate(cs);
break;
case BHSLR_REASON_REMOVE_FOR_RECOVERY:
response = cfiscsi_pdu_new_response(request, M_NOWAIT);
if (response == NULL) {
CFISCSI_SESSION_WARN(cs,
"failed to allocate memory; dropping connection");
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
return;
}
bhslr2 = (struct iscsi_bhs_logout_response *)response->ip_bhs;
bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
bhslr2->bhslr_flags = 0x80;
bhslr2->bhslr_response = BHSLR_RESPONSE_RECOVERY_NOT_SUPPORTED;
bhslr2->bhslr_initiator_task_tag =
bhslr->bhslr_initiator_task_tag;
icl_pdu_free(request);
cfiscsi_pdu_queue(response);
break;
default:
CFISCSI_SESSION_WARN(cs, "invalid reason 0%x; dropping connection",
bhslr->bhslr_reason);
icl_pdu_free(request);
cfiscsi_session_terminate(cs);
break;
}
}
static void
cfiscsi_callout(void *context)
{
struct icl_pdu *cp;
struct iscsi_bhs_nop_in *bhsni;
struct cfiscsi_session *cs;
cs = context;
if (cs->cs_terminating)
return;
callout_schedule(&cs->cs_callout, 1 * hz);
atomic_add_int(&cs->cs_timeout, 1);
#ifdef ICL_KERNEL_PROXY
if (cs->cs_waiting_for_ctld || cs->cs_login_phase) {
if (login_timeout > 0 && cs->cs_timeout > login_timeout) {
CFISCSI_SESSION_WARN(cs, "login timed out after "
"%d seconds; dropping connection", cs->cs_timeout);
cfiscsi_session_terminate(cs);
}
return;
}
#endif
if (ping_timeout <= 0) {
/*
* Pings are disabled. Don't send NOP-In in this case;
* user might have disabled pings to work around problems
* with certain initiators that can't properly handle
* NOP-In, such as iPXE. Reset the timeout, to avoid
* triggering reconnection, should the user decide to
* reenable them.
*/
cs->cs_timeout = 0;
return;
}
if (cs->cs_timeout >= ping_timeout) {
CFISCSI_SESSION_WARN(cs, "no ping reply (NOP-Out) after %d seconds; "
"dropping connection", ping_timeout);
cfiscsi_session_terminate(cs);
return;
}
/*
* If the ping was reset less than one second ago - which means
* that we've received some PDU during the last second - assume
* the traffic flows correctly and don't bother sending a NOP-Out.
*
* (It's 2 - one for one second, and one for incrementing is_timeout
* earlier in this routine.)
*/
if (cs->cs_timeout < 2)
return;
cp = icl_pdu_new(cs->cs_conn, M_NOWAIT);
if (cp == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to allocate memory");
return;
}
bhsni = (struct iscsi_bhs_nop_in *)cp->ip_bhs;
bhsni->bhsni_opcode = ISCSI_BHS_OPCODE_NOP_IN;
bhsni->bhsni_flags = 0x80;
bhsni->bhsni_initiator_task_tag = 0xffffffff;
cfiscsi_pdu_queue(cp);
}
static struct cfiscsi_data_wait *
cfiscsi_data_wait_new(struct cfiscsi_session *cs, union ctl_io *io,
uint32_t initiator_task_tag, uint32_t *target_transfer_tagp)
{
struct cfiscsi_data_wait *cdw;
int error;
cdw = uma_zalloc(cfiscsi_data_wait_zone, M_NOWAIT | M_ZERO);
if (cdw == NULL) {
CFISCSI_SESSION_WARN(cs,
"failed to allocate %zd bytes", sizeof(*cdw));
return (NULL);
}
error = icl_conn_transfer_setup(cs->cs_conn, io, target_transfer_tagp,
&cdw->cdw_icl_prv);
if (error != 0) {
CFISCSI_SESSION_WARN(cs,
"icl_conn_transfer_setup() failed with error %d", error);
uma_zfree(cfiscsi_data_wait_zone, cdw);
return (NULL);
}
cdw->cdw_ctl_io = io;
cdw->cdw_target_transfer_tag = *target_transfer_tagp;
cdw->cdw_initiator_task_tag = initiator_task_tag;
return (cdw);
}
static void
cfiscsi_data_wait_free(struct cfiscsi_session *cs,
struct cfiscsi_data_wait *cdw)
{
icl_conn_transfer_done(cs->cs_conn, cdw->cdw_icl_prv);
uma_zfree(cfiscsi_data_wait_zone, cdw);
}
static void
cfiscsi_session_terminate_tasks(struct cfiscsi_session *cs)
{
struct cfiscsi_data_wait *cdw;
union ctl_io *io;
int error, last, wait;
if (cs->cs_target == NULL)
return; /* No target yet, so nothing to do. */
io = ctl_alloc_io(cs->cs_target->ct_port.ctl_pool_ref);
ctl_zero_io(io);
io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = cs;
io->io_hdr.io_type = CTL_IO_TASK;
io->io_hdr.nexus.initid = cs->cs_ctl_initid;
io->io_hdr.nexus.targ_port = cs->cs_target->ct_port.targ_port;
io->io_hdr.nexus.targ_lun = 0;
io->taskio.tag_type = CTL_TAG_SIMPLE; /* XXX */
io->taskio.task_action = CTL_TASK_I_T_NEXUS_RESET;
wait = cs->cs_outstanding_ctl_pdus;
refcount_acquire(&cs->cs_outstanding_ctl_pdus);
error = ctl_queue(io);
if (error != CTL_RETVAL_COMPLETE) {
CFISCSI_SESSION_WARN(cs, "ctl_queue() failed; error %d", error);
refcount_release(&cs->cs_outstanding_ctl_pdus);
ctl_free_io(io);
}
CFISCSI_SESSION_LOCK(cs);
while ((cdw = TAILQ_FIRST(&cs->cs_waiting_for_data_out)) != NULL) {
TAILQ_REMOVE(&cs->cs_waiting_for_data_out, cdw, cdw_next);
CFISCSI_SESSION_UNLOCK(cs);
/*
* Set nonzero port status; this prevents backends from
* assuming that the data transfer actually succeeded
* and writing uninitialized data to disk.
*/
cdw->cdw_ctl_io->io_hdr.flags &= ~CTL_FLAG_DMA_INPROG;
cdw->cdw_ctl_io->scsiio.io_hdr.port_status = 42;
cdw->cdw_ctl_io->scsiio.be_move_done(cdw->cdw_ctl_io);
cfiscsi_data_wait_free(cs, cdw);
CFISCSI_SESSION_LOCK(cs);
}
CFISCSI_SESSION_UNLOCK(cs);
/*
* Wait for CTL to terminate all the tasks.
*/
if (wait > 0)
CFISCSI_SESSION_WARN(cs,
"waiting for CTL to terminate %d tasks", wait);
for (;;) {
refcount_acquire(&cs->cs_outstanding_ctl_pdus);
last = refcount_release(&cs->cs_outstanding_ctl_pdus);
if (last != 0)
break;
tsleep(__DEVOLATILE(void *, &cs->cs_outstanding_ctl_pdus),
0, "cfiscsi_terminate", hz / 100);
}
if (wait > 0)
CFISCSI_SESSION_WARN(cs, "tasks terminated");
}
static void
cfiscsi_maintenance_thread(void *arg)
{
struct cfiscsi_session *cs;
cs = arg;
for (;;) {
CFISCSI_SESSION_LOCK(cs);
if (cs->cs_terminating == false || cs->cs_handoff_in_progress)
cv_wait(&cs->cs_maintenance_cv, &cs->cs_lock);
CFISCSI_SESSION_UNLOCK(cs);
if (cs->cs_terminating && cs->cs_handoff_in_progress == false) {
/*
* We used to wait up to 30 seconds to deliver queued
* PDUs to the initiator. We also tried hard to deliver
* SCSI Responses for the aborted PDUs. We don't do
* that anymore. We might need to revisit that.
*/
callout_drain(&cs->cs_callout);
icl_conn_close(cs->cs_conn);
/*
* At this point ICL receive thread is no longer
* running; no new tasks can be queued.
*/
cfiscsi_session_terminate_tasks(cs);
cfiscsi_session_delete(cs);
kthread_exit();
return;
}
CFISCSI_SESSION_DEBUG(cs, "nothing to do");
}
}
static void
cfiscsi_session_terminate(struct cfiscsi_session *cs)
{
cs->cs_terminating = true;
cv_signal(&cs->cs_maintenance_cv);
#ifdef ICL_KERNEL_PROXY
cv_signal(&cs->cs_login_cv);
#endif
}
static int
cfiscsi_session_register_initiator(struct cfiscsi_session *cs)
{
struct cfiscsi_target *ct;
char *name;
int i;
KASSERT(cs->cs_ctl_initid == -1, ("already registered"));
ct = cs->cs_target;
name = strdup(cs->cs_initiator_id, M_CTL);
i = ctl_add_initiator(&ct->ct_port, -1, 0, name);
if (i < 0) {
CFISCSI_SESSION_WARN(cs, "ctl_add_initiator failed with error %d",
i);
cs->cs_ctl_initid = -1;
return (1);
}
cs->cs_ctl_initid = i;
#if 0
CFISCSI_SESSION_DEBUG(cs, "added initiator id %d", i);
#endif
return (0);
}
static void
cfiscsi_session_unregister_initiator(struct cfiscsi_session *cs)
{
int error;
if (cs->cs_ctl_initid == -1)
return;
error = ctl_remove_initiator(&cs->cs_target->ct_port, cs->cs_ctl_initid);
if (error != 0) {
CFISCSI_SESSION_WARN(cs, "ctl_remove_initiator failed with error %d",
error);
}
cs->cs_ctl_initid = -1;
}
static struct cfiscsi_session *
cfiscsi_session_new(struct cfiscsi_softc *softc, const char *offload)
{
struct cfiscsi_session *cs;
int error;
cs = malloc(sizeof(*cs), M_CFISCSI, M_NOWAIT | M_ZERO);
if (cs == NULL) {
CFISCSI_WARN("malloc failed");
return (NULL);
}
cs->cs_ctl_initid = -1;
refcount_init(&cs->cs_outstanding_ctl_pdus, 0);
TAILQ_INIT(&cs->cs_waiting_for_data_out);
mtx_init(&cs->cs_lock, "cfiscsi_lock", NULL, MTX_DEF);
cv_init(&cs->cs_maintenance_cv, "cfiscsi_mt");
#ifdef ICL_KERNEL_PROXY
cv_init(&cs->cs_login_cv, "cfiscsi_login");
#endif
/*
* The purpose of this is to avoid racing with session shutdown.
* Otherwise we could have the maintenance thread call icl_conn_close()
* before we call icl_conn_handoff().
*/
cs->cs_handoff_in_progress = true;
cs->cs_conn = icl_new_conn(offload, false, "cfiscsi", &cs->cs_lock);
if (cs->cs_conn == NULL) {
free(cs, M_CFISCSI);
return (NULL);
}
cs->cs_conn->ic_receive = cfiscsi_receive_callback;
cs->cs_conn->ic_error = cfiscsi_error_callback;
cs->cs_conn->ic_prv0 = cs;
error = kthread_add(cfiscsi_maintenance_thread, cs, NULL, NULL, 0, 0, "cfiscsimt");
if (error != 0) {
CFISCSI_SESSION_WARN(cs, "kthread_add(9) failed with error %d", error);
free(cs, M_CFISCSI);
return (NULL);
}
mtx_lock(&softc->lock);
cs->cs_id = ++softc->last_session_id;
TAILQ_INSERT_TAIL(&softc->sessions, cs, cs_next);
mtx_unlock(&softc->lock);
/*
* Start pinging the initiator.
*/
callout_init(&cs->cs_callout, 1);
callout_reset(&cs->cs_callout, 1 * hz, cfiscsi_callout, cs);
return (cs);
}
static void
cfiscsi_session_delete(struct cfiscsi_session *cs)
{
struct cfiscsi_softc *softc;
softc = &cfiscsi_softc;
KASSERT(cs->cs_outstanding_ctl_pdus == 0,
("destroying session with outstanding CTL pdus"));
KASSERT(TAILQ_EMPTY(&cs->cs_waiting_for_data_out),
("destroying session with non-empty queue"));
mtx_lock(&softc->lock);
TAILQ_REMOVE(&softc->sessions, cs, cs_next);
mtx_unlock(&softc->lock);
cfiscsi_session_unregister_initiator(cs);
if (cs->cs_target != NULL)
cfiscsi_target_release(cs->cs_target);
icl_conn_close(cs->cs_conn);
icl_conn_free(cs->cs_conn);
free(cs, M_CFISCSI);
cv_signal(&softc->sessions_cv);
}
static int
cfiscsi_init(void)
{
struct cfiscsi_softc *softc;
softc = &cfiscsi_softc;
bzero(softc, sizeof(*softc));
mtx_init(&softc->lock, "cfiscsi", NULL, MTX_DEF);
cv_init(&softc->sessions_cv, "cfiscsi_sessions");
#ifdef ICL_KERNEL_PROXY
cv_init(&softc->accept_cv, "cfiscsi_accept");
#endif
TAILQ_INIT(&softc->sessions);
TAILQ_INIT(&softc->targets);
cfiscsi_data_wait_zone = uma_zcreate("cfiscsi_data_wait",
sizeof(struct cfiscsi_data_wait), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
return (0);
}
static int
cfiscsi_shutdown(void)
{
struct cfiscsi_softc *softc = &cfiscsi_softc;
if (!TAILQ_EMPTY(&softc->sessions) || !TAILQ_EMPTY(&softc->targets))
return (EBUSY);
uma_zdestroy(cfiscsi_data_wait_zone);
#ifdef ICL_KERNEL_PROXY
cv_destroy(&softc->accept_cv);
#endif
cv_destroy(&softc->sessions_cv);
mtx_destroy(&softc->lock);
return (0);
}
#ifdef ICL_KERNEL_PROXY
static void
cfiscsi_accept(struct socket *so, struct sockaddr *sa, int portal_id)
{
struct cfiscsi_session *cs;
cs = cfiscsi_session_new(&cfiscsi_softc, NULL);
if (cs == NULL) {
CFISCSI_WARN("failed to create session");
return;
}
icl_conn_handoff_sock(cs->cs_conn, so);
cs->cs_initiator_sa = sa;
cs->cs_portal_id = portal_id;
cs->cs_handoff_in_progress = false;
cs->cs_waiting_for_ctld = true;
cv_signal(&cfiscsi_softc.accept_cv);
CFISCSI_SESSION_LOCK(cs);
/*
* Wake up the maintenance thread if we got scheduled for termination
* somewhere between cfiscsi_session_new() and icl_conn_handoff_sock().
*/
if (cs->cs_terminating)
cfiscsi_session_terminate(cs);
CFISCSI_SESSION_UNLOCK(cs);
}
#endif
static void
cfiscsi_online(void *arg)
{
struct cfiscsi_softc *softc;
struct cfiscsi_target *ct;
int online;
ct = (struct cfiscsi_target *)arg;
softc = ct->ct_softc;
mtx_lock(&softc->lock);
if (ct->ct_online) {
mtx_unlock(&softc->lock);
return;
}
ct->ct_online = 1;
online = softc->online++;
mtx_unlock(&softc->lock);
if (online > 0)
return;
#ifdef ICL_KERNEL_PROXY
if (softc->listener != NULL)
icl_listen_free(softc->listener);
softc->listener = icl_listen_new(cfiscsi_accept);
#endif
}
static void
cfiscsi_offline(void *arg)
{
struct cfiscsi_softc *softc;
struct cfiscsi_target *ct;
struct cfiscsi_session *cs;
int error, online;
ct = (struct cfiscsi_target *)arg;
softc = ct->ct_softc;
mtx_lock(&softc->lock);
if (!ct->ct_online) {
mtx_unlock(&softc->lock);
return;
}
ct->ct_online = 0;
online = --softc->online;
do {
TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
if (cs->cs_target == ct)
cfiscsi_session_terminate(cs);
}
TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
if (cs->cs_target == ct)
break;
}
if (cs != NULL) {
error = cv_wait_sig(&softc->sessions_cv, &softc->lock);
if (error != 0) {
CFISCSI_SESSION_DEBUG(cs,
"cv_wait failed with error %d\n", error);
break;
}
}
} while (cs != NULL && ct->ct_online == 0);
mtx_unlock(&softc->lock);
if (online > 0)
return;
#ifdef ICL_KERNEL_PROXY
icl_listen_free(softc->listener);
softc->listener = NULL;
#endif
}
static int
cfiscsi_info(void *arg, struct sbuf *sb)
{
struct cfiscsi_target *ct = (struct cfiscsi_target *)arg;
int retval;
retval = sbuf_printf(sb, "\t<cfiscsi_state>%d</cfiscsi_state>\n",
ct->ct_state);
return (retval);
}
static void
cfiscsi_ioctl_handoff(struct ctl_iscsi *ci)
{
struct cfiscsi_softc *softc;
struct cfiscsi_session *cs, *cs2;
struct cfiscsi_target *ct;
struct ctl_iscsi_handoff_params *cihp;
int error;
cihp = (struct ctl_iscsi_handoff_params *)&(ci->data);
softc = &cfiscsi_softc;
CFISCSI_DEBUG("new connection from %s (%s) to %s",
cihp->initiator_name, cihp->initiator_addr,
cihp->target_name);
ct = cfiscsi_target_find(softc, cihp->target_name,
cihp->portal_group_tag);
if (ct == NULL) {
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: target not found", __func__);
return;
}
#ifdef ICL_KERNEL_PROXY
if (cihp->socket > 0 && cihp->connection_id > 0) {
snprintf(ci->error_str, sizeof(ci->error_str),
"both socket and connection_id set");
ci->status = CTL_ISCSI_ERROR;
cfiscsi_target_release(ct);
return;
}
if (cihp->socket == 0) {
mtx_lock(&cfiscsi_softc.lock);
TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
if (cs->cs_id == cihp->connection_id)
break;
}
if (cs == NULL) {
mtx_unlock(&cfiscsi_softc.lock);
snprintf(ci->error_str, sizeof(ci->error_str),
"connection not found");
ci->status = CTL_ISCSI_ERROR;
cfiscsi_target_release(ct);
return;
}
mtx_unlock(&cfiscsi_softc.lock);
} else {
#endif
cs = cfiscsi_session_new(softc, cihp->offload);
if (cs == NULL) {
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: cfiscsi_session_new failed", __func__);
cfiscsi_target_release(ct);
return;
}
#ifdef ICL_KERNEL_PROXY
}
#endif
/*
* First PDU of Full Feature phase has the same CmdSN as the last
* PDU from the Login Phase received from the initiator. Thus,
* the -1 below.
*/
cs->cs_cmdsn = cihp->cmdsn;
cs->cs_statsn = cihp->statsn;
cs->cs_max_recv_data_segment_length = cihp->max_recv_data_segment_length;
cs->cs_max_send_data_segment_length = cihp->max_send_data_segment_length;
cs->cs_max_burst_length = cihp->max_burst_length;
cs->cs_first_burst_length = cihp->first_burst_length;
cs->cs_immediate_data = !!cihp->immediate_data;
if (cihp->header_digest == CTL_ISCSI_DIGEST_CRC32C)
cs->cs_conn->ic_header_crc32c = true;
if (cihp->data_digest == CTL_ISCSI_DIGEST_CRC32C)
cs->cs_conn->ic_data_crc32c = true;
strlcpy(cs->cs_initiator_name,
cihp->initiator_name, sizeof(cs->cs_initiator_name));
strlcpy(cs->cs_initiator_addr,
cihp->initiator_addr, sizeof(cs->cs_initiator_addr));
strlcpy(cs->cs_initiator_alias,
cihp->initiator_alias, sizeof(cs->cs_initiator_alias));
memcpy(cs->cs_initiator_isid,
cihp->initiator_isid, sizeof(cs->cs_initiator_isid));
snprintf(cs->cs_initiator_id, sizeof(cs->cs_initiator_id),
"%s,i,0x%02x%02x%02x%02x%02x%02x", cs->cs_initiator_name,
cihp->initiator_isid[0], cihp->initiator_isid[1],
cihp->initiator_isid[2], cihp->initiator_isid[3],
cihp->initiator_isid[4], cihp->initiator_isid[5]);
mtx_lock(&softc->lock);
if (ct->ct_online == 0) {
mtx_unlock(&softc->lock);
CFISCSI_SESSION_LOCK(cs);
cs->cs_handoff_in_progress = false;
cfiscsi_session_terminate(cs);
CFISCSI_SESSION_UNLOCK(cs);
cfiscsi_target_release(ct);
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: port offline", __func__);
return;
}
cs->cs_target = ct;
mtx_unlock(&softc->lock);
restart:
if (!cs->cs_terminating) {
mtx_lock(&softc->lock);
TAILQ_FOREACH(cs2, &softc->sessions, cs_next) {
if (cs2 != cs && cs2->cs_tasks_aborted == false &&
cs->cs_target == cs2->cs_target &&
strcmp(cs->cs_initiator_id, cs2->cs_initiator_id) == 0) {
if (strcmp(cs->cs_initiator_addr,
cs2->cs_initiator_addr) != 0) {
CFISCSI_SESSION_WARN(cs2,
"session reinstatement from "
"different address %s",
cs->cs_initiator_addr);
} else {
CFISCSI_SESSION_DEBUG(cs2,
"session reinstatement");
}
cfiscsi_session_terminate(cs2);
mtx_unlock(&softc->lock);
pause("cfiscsi_reinstate", 1);
goto restart;
}
}
mtx_unlock(&softc->lock);
}
/*
* Register initiator with CTL.
*/
cfiscsi_session_register_initiator(cs);
#ifdef ICL_KERNEL_PROXY
if (cihp->socket > 0) {
#endif
error = icl_conn_handoff(cs->cs_conn, cihp->socket);
if (error != 0) {
CFISCSI_SESSION_LOCK(cs);
cs->cs_handoff_in_progress = false;
cfiscsi_session_terminate(cs);
CFISCSI_SESSION_UNLOCK(cs);
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: icl_conn_handoff failed with error %d",
__func__, error);
return;
}
#ifdef ICL_KERNEL_PROXY
}
#endif
#ifdef ICL_KERNEL_PROXY
cs->cs_login_phase = false;
/*
* First PDU of the Full Feature phase has likely already arrived.
* We have to pick it up and execute properly.
*/
if (cs->cs_login_pdu != NULL) {
CFISCSI_SESSION_DEBUG(cs, "picking up first PDU");
cfiscsi_pdu_handle(cs->cs_login_pdu);
cs->cs_login_pdu = NULL;
}
#endif
CFISCSI_SESSION_LOCK(cs);
cs->cs_handoff_in_progress = false;
/*
* Wake up the maintenance thread if we got scheduled for termination.
*/
if (cs->cs_terminating)
cfiscsi_session_terminate(cs);
CFISCSI_SESSION_UNLOCK(cs);
ci->status = CTL_ISCSI_OK;
}
static void
cfiscsi_ioctl_list(struct ctl_iscsi *ci)
{
struct ctl_iscsi_list_params *cilp;
struct cfiscsi_session *cs;
struct cfiscsi_softc *softc;
struct sbuf *sb;
int error;
cilp = (struct ctl_iscsi_list_params *)&(ci->data);
softc = &cfiscsi_softc;
sb = sbuf_new(NULL, NULL, cilp->alloc_len, SBUF_FIXEDLEN);
if (sb == NULL) {
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"Unable to allocate %d bytes for iSCSI session list",
cilp->alloc_len);
return;
}
sbuf_printf(sb, "<ctlislist>\n");
mtx_lock(&softc->lock);
TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
if (cs->cs_target == NULL)
continue;
error = sbuf_printf(sb, "<connection id=\"%d\">"
"<initiator>%s</initiator>"
"<initiator_addr>%s</initiator_addr>"
"<initiator_alias>%s</initiator_alias>"
"<target>%s</target>"
"<target_alias>%s</target_alias>"
"<target_portal_group_tag>%u</target_portal_group_tag>"
"<header_digest>%s</header_digest>"
"<data_digest>%s</data_digest>"
"<max_recv_data_segment_length>%d</max_recv_data_segment_length>"
"<max_send_data_segment_length>%d</max_send_data_segment_length>"
"<max_burst_length>%d</max_burst_length>"
"<first_burst_length>%d</first_burst_length>"
"<immediate_data>%d</immediate_data>"
"<iser>%d</iser>"
"<offload>%s</offload>"
"</connection>\n",
cs->cs_id,
cs->cs_initiator_name, cs->cs_initiator_addr, cs->cs_initiator_alias,
cs->cs_target->ct_name, cs->cs_target->ct_alias,
cs->cs_target->ct_tag,
cs->cs_conn->ic_header_crc32c ? "CRC32C" : "None",
cs->cs_conn->ic_data_crc32c ? "CRC32C" : "None",
cs->cs_max_recv_data_segment_length,
cs->cs_max_send_data_segment_length,
cs->cs_max_burst_length,
cs->cs_first_burst_length,
cs->cs_immediate_data,
cs->cs_conn->ic_iser,
cs->cs_conn->ic_offload);
if (error != 0)
break;
}
mtx_unlock(&softc->lock);
error = sbuf_printf(sb, "</ctlislist>\n");
if (error != 0) {
sbuf_delete(sb);
ci->status = CTL_ISCSI_LIST_NEED_MORE_SPACE;
snprintf(ci->error_str, sizeof(ci->error_str),
"Out of space, %d bytes is too small", cilp->alloc_len);
return;
}
sbuf_finish(sb);
error = copyout(sbuf_data(sb), cilp->conn_xml, sbuf_len(sb) + 1);
if (error != 0) {
sbuf_delete(sb);
snprintf(ci->error_str, sizeof(ci->error_str),
"copyout failed with error %d", error);
ci->status = CTL_ISCSI_ERROR;
return;
}
cilp->fill_len = sbuf_len(sb) + 1;
ci->status = CTL_ISCSI_OK;
sbuf_delete(sb);
}
static void
cfiscsi_ioctl_logout(struct ctl_iscsi *ci)
{
struct icl_pdu *response;
struct iscsi_bhs_asynchronous_message *bhsam;
struct ctl_iscsi_logout_params *cilp;
struct cfiscsi_session *cs;
struct cfiscsi_softc *softc;
int found = 0;
cilp = (struct ctl_iscsi_logout_params *)&(ci->data);
softc = &cfiscsi_softc;
mtx_lock(&softc->lock);
TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
if (cilp->all == 0 && cs->cs_id != cilp->connection_id &&
strcmp(cs->cs_initiator_name, cilp->initiator_name) != 0 &&
strcmp(cs->cs_initiator_addr, cilp->initiator_addr) != 0)
continue;
response = icl_pdu_new(cs->cs_conn, M_NOWAIT);
if (response == NULL) {
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"Unable to allocate memory");
mtx_unlock(&softc->lock);
return;
}
bhsam =
(struct iscsi_bhs_asynchronous_message *)response->ip_bhs;
bhsam->bhsam_opcode = ISCSI_BHS_OPCODE_ASYNC_MESSAGE;
bhsam->bhsam_flags = 0x80;
bhsam->bhsam_async_event = BHSAM_EVENT_TARGET_REQUESTS_LOGOUT;
bhsam->bhsam_parameter3 = htons(10);
cfiscsi_pdu_queue(response);
found++;
}
mtx_unlock(&softc->lock);
if (found == 0) {
ci->status = CTL_ISCSI_SESSION_NOT_FOUND;
snprintf(ci->error_str, sizeof(ci->error_str),
"No matching connections found");
return;
}
ci->status = CTL_ISCSI_OK;
}
static void
cfiscsi_ioctl_terminate(struct ctl_iscsi *ci)
{
struct icl_pdu *response;
struct iscsi_bhs_asynchronous_message *bhsam;
struct ctl_iscsi_terminate_params *citp;
struct cfiscsi_session *cs;
struct cfiscsi_softc *softc;
int found = 0;
citp = (struct ctl_iscsi_terminate_params *)&(ci->data);
softc = &cfiscsi_softc;
mtx_lock(&softc->lock);
TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
if (citp->all == 0 && cs->cs_id != citp->connection_id &&
strcmp(cs->cs_initiator_name, citp->initiator_name) != 0 &&
strcmp(cs->cs_initiator_addr, citp->initiator_addr) != 0)
continue;
response = icl_pdu_new(cs->cs_conn, M_NOWAIT);
if (response == NULL) {
/*
* Oh well. Just terminate the connection.
*/
} else {
bhsam = (struct iscsi_bhs_asynchronous_message *)
response->ip_bhs;
bhsam->bhsam_opcode = ISCSI_BHS_OPCODE_ASYNC_MESSAGE;
bhsam->bhsam_flags = 0x80;
bhsam->bhsam_0xffffffff = 0xffffffff;
bhsam->bhsam_async_event =
BHSAM_EVENT_TARGET_TERMINATES_SESSION;
cfiscsi_pdu_queue(response);
}
cfiscsi_session_terminate(cs);
found++;
}
mtx_unlock(&softc->lock);
if (found == 0) {
ci->status = CTL_ISCSI_SESSION_NOT_FOUND;
snprintf(ci->error_str, sizeof(ci->error_str),
"No matching connections found");
return;
}
ci->status = CTL_ISCSI_OK;
}
static void
cfiscsi_ioctl_limits(struct ctl_iscsi *ci)
{
struct ctl_iscsi_limits_params *cilp;
struct icl_drv_limits idl;
int error;
cilp = (struct ctl_iscsi_limits_params *)&(ci->data);
error = icl_limits(cilp->offload, false, &idl);
if (error != 0) {
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: icl_limits failed with error %d",
__func__, error);
return;
}
cilp->max_recv_data_segment_length =
idl.idl_max_recv_data_segment_length;
cilp->max_send_data_segment_length =
idl.idl_max_send_data_segment_length;
cilp->max_burst_length = idl.idl_max_burst_length;
cilp->first_burst_length = idl.idl_first_burst_length;
ci->status = CTL_ISCSI_OK;
}
#ifdef ICL_KERNEL_PROXY
static void
cfiscsi_ioctl_listen(struct ctl_iscsi *ci)
{
struct ctl_iscsi_listen_params *cilp;
struct sockaddr *sa;
int error;
cilp = (struct ctl_iscsi_listen_params *)&(ci->data);
if (cfiscsi_softc.listener == NULL) {
CFISCSI_DEBUG("no listener");
snprintf(ci->error_str, sizeof(ci->error_str), "no listener");
ci->status = CTL_ISCSI_ERROR;
return;
}
error = getsockaddr(&sa, (void *)cilp->addr, cilp->addrlen);
if (error != 0) {
CFISCSI_DEBUG("getsockaddr, error %d", error);
snprintf(ci->error_str, sizeof(ci->error_str), "getsockaddr failed");
ci->status = CTL_ISCSI_ERROR;
return;
}
error = icl_listen_add(cfiscsi_softc.listener, cilp->iser, cilp->domain,
cilp->socktype, cilp->protocol, sa, cilp->portal_id);
if (error != 0) {
free(sa, M_SONAME);
CFISCSI_DEBUG("icl_listen_add, error %d", error);
snprintf(ci->error_str, sizeof(ci->error_str),
"icl_listen_add failed, error %d", error);
ci->status = CTL_ISCSI_ERROR;
return;
}
ci->status = CTL_ISCSI_OK;
}
static void
cfiscsi_ioctl_accept(struct ctl_iscsi *ci)
{
struct ctl_iscsi_accept_params *ciap;
struct cfiscsi_session *cs;
int error;
ciap = (struct ctl_iscsi_accept_params *)&(ci->data);
mtx_lock(&cfiscsi_softc.lock);
for (;;) {
TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
if (cs->cs_waiting_for_ctld)
break;
}
if (cs != NULL)
break;
error = cv_wait_sig(&cfiscsi_softc.accept_cv, &cfiscsi_softc.lock);
if (error != 0) {
mtx_unlock(&cfiscsi_softc.lock);
snprintf(ci->error_str, sizeof(ci->error_str), "interrupted");
ci->status = CTL_ISCSI_ERROR;
return;
}
}
mtx_unlock(&cfiscsi_softc.lock);
cs->cs_waiting_for_ctld = false;
cs->cs_login_phase = true;
ciap->connection_id = cs->cs_id;
ciap->portal_id = cs->cs_portal_id;
ciap->initiator_addrlen = cs->cs_initiator_sa->sa_len;
error = copyout(cs->cs_initiator_sa, ciap->initiator_addr,
cs->cs_initiator_sa->sa_len);
if (error != 0) {
snprintf(ci->error_str, sizeof(ci->error_str),
"copyout failed with error %d", error);
ci->status = CTL_ISCSI_ERROR;
return;
}
ci->status = CTL_ISCSI_OK;
}
static void
cfiscsi_ioctl_send(struct ctl_iscsi *ci)
{
struct ctl_iscsi_send_params *cisp;
struct cfiscsi_session *cs;
struct icl_pdu *ip;
size_t datalen;
void *data;
int error;
cisp = (struct ctl_iscsi_send_params *)&(ci->data);
mtx_lock(&cfiscsi_softc.lock);
TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
if (cs->cs_id == cisp->connection_id)
break;
}
if (cs == NULL) {
mtx_unlock(&cfiscsi_softc.lock);
snprintf(ci->error_str, sizeof(ci->error_str), "connection not found");
ci->status = CTL_ISCSI_ERROR;
return;
}
mtx_unlock(&cfiscsi_softc.lock);
#if 0
if (cs->cs_login_phase == false)
return (EBUSY);
#endif
if (cs->cs_terminating) {
snprintf(ci->error_str, sizeof(ci->error_str), "connection is terminating");
ci->status = CTL_ISCSI_ERROR;
return;
}
datalen = cisp->data_segment_len;
/*
* XXX
*/
//if (datalen > CFISCSI_MAX_DATA_SEGMENT_LENGTH) {
if (datalen > 65535) {
snprintf(ci->error_str, sizeof(ci->error_str), "data segment too big");
ci->status = CTL_ISCSI_ERROR;
return;
}
if (datalen > 0) {
data = malloc(datalen, M_CFISCSI, M_WAITOK);
error = copyin(cisp->data_segment, data, datalen);
if (error != 0) {
free(data, M_CFISCSI);
snprintf(ci->error_str, sizeof(ci->error_str), "copyin error %d", error);
ci->status = CTL_ISCSI_ERROR;
return;
}
}
ip = icl_pdu_new(cs->cs_conn, M_WAITOK);
memcpy(ip->ip_bhs, cisp->bhs, sizeof(*ip->ip_bhs));
if (datalen > 0) {
icl_pdu_append_data(ip, data, datalen, M_WAITOK);
free(data, M_CFISCSI);
}
CFISCSI_SESSION_LOCK(cs);
icl_pdu_queue(ip);
CFISCSI_SESSION_UNLOCK(cs);
ci->status = CTL_ISCSI_OK;
}
static void
cfiscsi_ioctl_receive(struct ctl_iscsi *ci)
{
struct ctl_iscsi_receive_params *cirp;
struct cfiscsi_session *cs;
struct icl_pdu *ip;
void *data;
int error;
cirp = (struct ctl_iscsi_receive_params *)&(ci->data);
mtx_lock(&cfiscsi_softc.lock);
TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
if (cs->cs_id == cirp->connection_id)
break;
}
if (cs == NULL) {
mtx_unlock(&cfiscsi_softc.lock);
snprintf(ci->error_str, sizeof(ci->error_str),
"connection not found");
ci->status = CTL_ISCSI_ERROR;
return;
}
mtx_unlock(&cfiscsi_softc.lock);
#if 0
if (is->is_login_phase == false)
return (EBUSY);
#endif
CFISCSI_SESSION_LOCK(cs);
while (cs->cs_login_pdu == NULL && cs->cs_terminating == false) {
error = cv_wait_sig(&cs->cs_login_cv, &cs->cs_lock);
if (error != 0) {
CFISCSI_SESSION_UNLOCK(cs);
snprintf(ci->error_str, sizeof(ci->error_str),
"interrupted by signal");
ci->status = CTL_ISCSI_ERROR;
return;
}
}
if (cs->cs_terminating) {
CFISCSI_SESSION_UNLOCK(cs);
snprintf(ci->error_str, sizeof(ci->error_str),
"connection terminating");
ci->status = CTL_ISCSI_ERROR;
return;
}
ip = cs->cs_login_pdu;
cs->cs_login_pdu = NULL;
CFISCSI_SESSION_UNLOCK(cs);
if (ip->ip_data_len > cirp->data_segment_len) {
icl_pdu_free(ip);
snprintf(ci->error_str, sizeof(ci->error_str),
"data segment too big");
ci->status = CTL_ISCSI_ERROR;
return;
}
copyout(ip->ip_bhs, cirp->bhs, sizeof(*ip->ip_bhs));
if (ip->ip_data_len > 0) {
data = malloc(ip->ip_data_len, M_CFISCSI, M_WAITOK);
icl_pdu_get_data(ip, 0, data, ip->ip_data_len);
copyout(data, cirp->data_segment, ip->ip_data_len);
free(data, M_CFISCSI);
}
icl_pdu_free(ip);
ci->status = CTL_ISCSI_OK;
}
#endif /* !ICL_KERNEL_PROXY */
static void
cfiscsi_ioctl_port_create(struct ctl_req *req)
{
struct cfiscsi_target *ct;
struct ctl_port *port;
const char *target, *alias, *val;
struct scsi_vpd_id_descriptor *desc;
int retval, len, idlen;
uint16_t tag;
target = dnvlist_get_string(req->args_nvl, "cfiscsi_target", NULL);
alias = dnvlist_get_string(req->args_nvl, "cfiscsi_target_alias", NULL);
val = dnvlist_get_string(req->args_nvl, "cfiscsi_portal_group_tag",
NULL);
if (target == NULL || val == NULL) {
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"Missing required argument");
return;
}
tag = strtoul(val, NULL, 0);
ct = cfiscsi_target_find_or_create(&cfiscsi_softc, target, alias, tag);
if (ct == NULL) {
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"failed to create target \"%s\"", target);
return;
}
if (ct->ct_state == CFISCSI_TARGET_STATE_ACTIVE) {
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"target \"%s\" for portal group tag %u already exists",
target, tag);
cfiscsi_target_release(ct);
return;
}
port = &ct->ct_port;
// WAT
if (ct->ct_state == CFISCSI_TARGET_STATE_DYING)
goto done;
port->frontend = &cfiscsi_frontend;
port->port_type = CTL_PORT_ISCSI;
/* XXX KDM what should the real number be here? */
port->num_requested_ctl_io = 4096;
port->port_name = "iscsi";
port->physical_port = (int)tag;
port->virtual_port = ct->ct_target_id;
port->port_online = cfiscsi_online;
port->port_offline = cfiscsi_offline;
port->port_info = cfiscsi_info;
port->onoff_arg = ct;
port->fe_datamove = cfiscsi_datamove;
port->fe_done = cfiscsi_done;
port->targ_port = -1;
port->options = nvlist_clone(req->args_nvl);
/* Generate Port ID. */
idlen = strlen(target) + strlen(",t,0x0001") + 1;
idlen = roundup2(idlen, 4);
len = sizeof(struct scsi_vpd_device_id) + idlen;
port->port_devid = malloc(sizeof(struct ctl_devid) + len,
M_CTL, M_WAITOK | M_ZERO);
port->port_devid->len = len;
desc = (struct scsi_vpd_id_descriptor *)port->port_devid->data;
desc->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
desc->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_PORT |
SVPD_ID_TYPE_SCSI_NAME;
desc->length = idlen;
snprintf(desc->identifier, idlen, "%s,t,0x%4.4x", target, tag);
/* Generate Target ID. */
idlen = strlen(target) + 1;
idlen = roundup2(idlen, 4);
len = sizeof(struct scsi_vpd_device_id) + idlen;
port->target_devid = malloc(sizeof(struct ctl_devid) + len,
M_CTL, M_WAITOK | M_ZERO);
port->target_devid->len = len;
desc = (struct scsi_vpd_id_descriptor *)port->target_devid->data;
desc->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
desc->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_TARGET |
SVPD_ID_TYPE_SCSI_NAME;
desc->length = idlen;
strlcpy(desc->identifier, target, idlen);
retval = ctl_port_register(port);
if (retval != 0) {
free(port->port_devid, M_CFISCSI);
free(port->target_devid, M_CFISCSI);
cfiscsi_target_release(ct);
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"ctl_port_register() failed with error %d", retval);
return;
}
done:
ct->ct_state = CFISCSI_TARGET_STATE_ACTIVE;
req->status = CTL_LUN_OK;
req->result_nvl = nvlist_create(0);
nvlist_add_number(req->result_nvl, "port_id", port->targ_port);
}
static void
cfiscsi_ioctl_port_remove(struct ctl_req *req)
{
struct cfiscsi_target *ct;
const char *target, *val;
uint16_t tag;
target = dnvlist_get_string(req->args_nvl, "cfiscsi_target", NULL);
val = dnvlist_get_string(req->args_nvl, "cfiscsi_portal_group_tag",
NULL);
if (target == NULL || val == NULL) {
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"Missing required argument");
return;
}
tag = strtoul(val, NULL, 0);
ct = cfiscsi_target_find(&cfiscsi_softc, target, tag);
if (ct == NULL) {
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"can't find target \"%s\"", target);
return;
}
ct->ct_state = CFISCSI_TARGET_STATE_DYING;
ctl_port_offline(&ct->ct_port);
cfiscsi_target_release(ct);
cfiscsi_target_release(ct);
req->status = CTL_LUN_OK;
}
static int
cfiscsi_ioctl(struct cdev *dev,
u_long cmd, caddr_t addr, int flag, struct thread *td)
{
struct ctl_iscsi *ci;
struct ctl_req *req;
if (cmd == CTL_PORT_REQ) {
req = (struct ctl_req *)addr;
switch (req->reqtype) {
case CTL_REQ_CREATE:
cfiscsi_ioctl_port_create(req);
break;
case CTL_REQ_REMOVE:
cfiscsi_ioctl_port_remove(req);
break;
default:
req->status = CTL_LUN_ERROR;
snprintf(req->error_str, sizeof(req->error_str),
"Unsupported request type %d", req->reqtype);
}
return (0);
}
if (cmd != CTL_ISCSI)
return (ENOTTY);
ci = (struct ctl_iscsi *)addr;
switch (ci->type) {
case CTL_ISCSI_HANDOFF:
cfiscsi_ioctl_handoff(ci);
break;
case CTL_ISCSI_LIST:
cfiscsi_ioctl_list(ci);
break;
case CTL_ISCSI_LOGOUT:
cfiscsi_ioctl_logout(ci);
break;
case CTL_ISCSI_TERMINATE:
cfiscsi_ioctl_terminate(ci);
break;
case CTL_ISCSI_LIMITS:
cfiscsi_ioctl_limits(ci);
break;
#ifdef ICL_KERNEL_PROXY
case CTL_ISCSI_LISTEN:
cfiscsi_ioctl_listen(ci);
break;
case CTL_ISCSI_ACCEPT:
cfiscsi_ioctl_accept(ci);
break;
case CTL_ISCSI_SEND:
cfiscsi_ioctl_send(ci);
break;
case CTL_ISCSI_RECEIVE:
cfiscsi_ioctl_receive(ci);
break;
#else
case CTL_ISCSI_LISTEN:
case CTL_ISCSI_ACCEPT:
case CTL_ISCSI_SEND:
case CTL_ISCSI_RECEIVE:
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: CTL compiled without ICL_KERNEL_PROXY",
__func__);
break;
#endif /* !ICL_KERNEL_PROXY */
default:
ci->status = CTL_ISCSI_ERROR;
snprintf(ci->error_str, sizeof(ci->error_str),
"%s: invalid iSCSI request type %d", __func__, ci->type);
break;
}
return (0);
}
static void
cfiscsi_target_hold(struct cfiscsi_target *ct)
{
refcount_acquire(&ct->ct_refcount);
}
static void
cfiscsi_target_release(struct cfiscsi_target *ct)
{
struct cfiscsi_softc *softc;
softc = ct->ct_softc;
mtx_lock(&softc->lock);
if (refcount_release(&ct->ct_refcount)) {
TAILQ_REMOVE(&softc->targets, ct, ct_next);
mtx_unlock(&softc->lock);
if (ct->ct_state != CFISCSI_TARGET_STATE_INVALID) {
ct->ct_state = CFISCSI_TARGET_STATE_INVALID;
if (ctl_port_deregister(&ct->ct_port) != 0)
printf("%s: ctl_port_deregister() failed\n",
__func__);
}
free(ct, M_CFISCSI);
return;
}
mtx_unlock(&softc->lock);
}
static struct cfiscsi_target *
cfiscsi_target_find(struct cfiscsi_softc *softc, const char *name, uint16_t tag)
{
struct cfiscsi_target *ct;
mtx_lock(&softc->lock);
TAILQ_FOREACH(ct, &softc->targets, ct_next) {
if (ct->ct_tag != tag ||
strcmp(name, ct->ct_name) != 0 ||
ct->ct_state != CFISCSI_TARGET_STATE_ACTIVE)
continue;
cfiscsi_target_hold(ct);
mtx_unlock(&softc->lock);
return (ct);
}
mtx_unlock(&softc->lock);
return (NULL);
}
static struct cfiscsi_target *
cfiscsi_target_find_or_create(struct cfiscsi_softc *softc, const char *name,
const char *alias, uint16_t tag)
{
struct cfiscsi_target *ct, *newct;
if (name[0] == '\0' || strlen(name) >= CTL_ISCSI_NAME_LEN)
return (NULL);
newct = malloc(sizeof(*newct), M_CFISCSI, M_WAITOK | M_ZERO);
mtx_lock(&softc->lock);
TAILQ_FOREACH(ct, &softc->targets, ct_next) {
if (ct->ct_tag != tag ||
strcmp(name, ct->ct_name) != 0 ||
ct->ct_state == CFISCSI_TARGET_STATE_INVALID)
continue;
cfiscsi_target_hold(ct);
mtx_unlock(&softc->lock);
free(newct, M_CFISCSI);
return (ct);
}
strlcpy(newct->ct_name, name, sizeof(newct->ct_name));
if (alias != NULL)
strlcpy(newct->ct_alias, alias, sizeof(newct->ct_alias));
newct->ct_tag = tag;
refcount_init(&newct->ct_refcount, 1);
newct->ct_softc = softc;
if (TAILQ_EMPTY(&softc->targets))
softc->last_target_id = 0;
newct->ct_target_id = ++softc->last_target_id;
TAILQ_INSERT_TAIL(&softc->targets, newct, ct_next);
mtx_unlock(&softc->lock);
return (newct);
}
static void
cfiscsi_datamove_in(union ctl_io *io)
{
struct cfiscsi_session *cs;
struct icl_pdu *request, *response;
const struct iscsi_bhs_scsi_command *bhssc;
struct iscsi_bhs_data_in *bhsdi;
struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
size_t len, expected_len, sg_len, buffer_offset;
const char *sg_addr;
int ctl_sg_count, error, i;
request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
cs = PDU_SESSION(request);
bhssc = (const struct iscsi_bhs_scsi_command *)request->ip_bhs;
KASSERT((bhssc->bhssc_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_COMMAND,
("bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_COMMAND"));
if (io->scsiio.kern_sg_entries > 0) {
ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
ctl_sg_count = io->scsiio.kern_sg_entries;
} else {
ctl_sglist = &ctl_sg_entry;
ctl_sglist->addr = io->scsiio.kern_data_ptr;
ctl_sglist->len = io->scsiio.kern_data_len;
ctl_sg_count = 1;
}
/*
* This is the total amount of data to be transferred within the current
* SCSI command. We need to record it so that we can properly report
* underflow/underflow.
*/
PDU_TOTAL_TRANSFER_LEN(request) = io->scsiio.kern_total_len;
/*
* This is the offset within the current SCSI command; for the first
* call to cfiscsi_datamove() it will be 0, and for subsequent ones
* it will be the sum of lengths of previous ones.
*/
buffer_offset = io->scsiio.kern_rel_offset;
/*
* This is the transfer length expected by the initiator. In theory,
* it could be different from the correct amount of data from the SCSI
* point of view, even if that doesn't make any sense.
*/
expected_len = ntohl(bhssc->bhssc_expected_data_transfer_length);
#if 0
if (expected_len != io->scsiio.kern_total_len) {
CFISCSI_SESSION_DEBUG(cs, "expected transfer length %zd, "
"actual length %zd", expected_len,
(size_t)io->scsiio.kern_total_len);
}
#endif
if (buffer_offset >= expected_len) {
#if 0
CFISCSI_SESSION_DEBUG(cs, "buffer_offset = %zd, "
"already sent the expected len", buffer_offset);
#endif
io->scsiio.be_move_done(io);
return;
}
i = 0;
sg_addr = NULL;
sg_len = 0;
response = NULL;
bhsdi = NULL;
for (;;) {
if (response == NULL) {
response = cfiscsi_pdu_new_response(request, M_NOWAIT);
if (response == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to "
"allocate memory; dropping connection");
ctl_set_busy(&io->scsiio);
io->scsiio.be_move_done(io);
cfiscsi_session_terminate(cs);
return;
}
bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs;
bhsdi->bhsdi_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_IN;
bhsdi->bhsdi_initiator_task_tag =
bhssc->bhssc_initiator_task_tag;
bhsdi->bhsdi_target_transfer_tag = 0xffffffff;
bhsdi->bhsdi_datasn = htonl(PDU_EXPDATASN(request));
PDU_EXPDATASN(request)++;
bhsdi->bhsdi_buffer_offset = htonl(buffer_offset);
}
KASSERT(i < ctl_sg_count, ("i >= ctl_sg_count"));
if (sg_len == 0) {
sg_addr = ctl_sglist[i].addr;
sg_len = ctl_sglist[i].len;
KASSERT(sg_len > 0, ("sg_len <= 0"));
}
len = sg_len;
/*
* Truncate to maximum data segment length.
*/
KASSERT(response->ip_data_len < cs->cs_max_send_data_segment_length,
("ip_data_len %zd >= max_send_data_segment_length %d",
response->ip_data_len, cs->cs_max_send_data_segment_length));
if (response->ip_data_len + len >
cs->cs_max_send_data_segment_length) {
len = cs->cs_max_send_data_segment_length -
response->ip_data_len;
KASSERT(len <= sg_len, ("len %zd > sg_len %zd",
len, sg_len));
}
/*
* Truncate to expected data transfer length.
*/
KASSERT(buffer_offset + response->ip_data_len < expected_len,
("buffer_offset %zd + ip_data_len %zd >= expected_len %zd",
buffer_offset, response->ip_data_len, expected_len));
if (buffer_offset + response->ip_data_len + len > expected_len) {
CFISCSI_SESSION_DEBUG(cs, "truncating from %zd "
"to expected data transfer length %zd",
buffer_offset + response->ip_data_len + len, expected_len);
len = expected_len - (buffer_offset + response->ip_data_len);
KASSERT(len <= sg_len, ("len %zd > sg_len %zd",
len, sg_len));
}
error = icl_pdu_append_data(response, sg_addr, len, M_NOWAIT);
if (error != 0) {
CFISCSI_SESSION_WARN(cs, "failed to "
"allocate memory; dropping connection");
icl_pdu_free(response);
ctl_set_busy(&io->scsiio);
io->scsiio.be_move_done(io);
cfiscsi_session_terminate(cs);
return;
}
sg_addr += len;
sg_len -= len;
io->scsiio.kern_data_resid -= len;
KASSERT(buffer_offset + response->ip_data_len <= expected_len,
("buffer_offset %zd + ip_data_len %zd > expected_len %zd",
buffer_offset, response->ip_data_len, expected_len));
if (buffer_offset + response->ip_data_len == expected_len) {
/*
* Already have the amount of data the initiator wanted.
*/
break;
}
if (sg_len == 0) {
/*
* End of scatter-gather segment;
* proceed to the next one...
*/
if (i == ctl_sg_count - 1) {
/*
* ... unless this was the last one.
*/
break;
}
i++;
}
if (response->ip_data_len == cs->cs_max_send_data_segment_length) {
/*
* Can't stuff more data into the current PDU;
* queue it. Note that's not enough to check
* for kern_data_resid == 0 instead; there
* may be several Data-In PDUs for the final
* call to cfiscsi_datamove(), and we want
* to set the F flag only on the last of them.
*/
buffer_offset += response->ip_data_len;
if (buffer_offset == io->scsiio.kern_total_len ||
buffer_offset == expected_len) {
buffer_offset -= response->ip_data_len;
break;
}
cfiscsi_pdu_queue(response);
response = NULL;
bhsdi = NULL;
}
}
if (response != NULL) {
buffer_offset += response->ip_data_len;
if (buffer_offset == io->scsiio.kern_total_len ||
buffer_offset == expected_len) {
bhsdi->bhsdi_flags |= BHSDI_FLAGS_F;
if (io->io_hdr.status == CTL_SUCCESS) {
bhsdi->bhsdi_flags |= BHSDI_FLAGS_S;
if (PDU_TOTAL_TRANSFER_LEN(request) <
ntohl(bhssc->bhssc_expected_data_transfer_length)) {
bhsdi->bhsdi_flags |= BHSSR_FLAGS_RESIDUAL_UNDERFLOW;
bhsdi->bhsdi_residual_count =
htonl(ntohl(bhssc->bhssc_expected_data_transfer_length) -
PDU_TOTAL_TRANSFER_LEN(request));
} else if (PDU_TOTAL_TRANSFER_LEN(request) >
ntohl(bhssc->bhssc_expected_data_transfer_length)) {
bhsdi->bhsdi_flags |= BHSSR_FLAGS_RESIDUAL_OVERFLOW;
bhsdi->bhsdi_residual_count =
htonl(PDU_TOTAL_TRANSFER_LEN(request) -
ntohl(bhssc->bhssc_expected_data_transfer_length));
}
bhsdi->bhsdi_status = io->scsiio.scsi_status;
io->io_hdr.flags |= CTL_FLAG_STATUS_SENT;
}
}
KASSERT(response->ip_data_len > 0, ("sending empty Data-In"));
cfiscsi_pdu_queue(response);
}
io->scsiio.be_move_done(io);
}
static void
cfiscsi_datamove_out(union ctl_io *io)
{
struct cfiscsi_session *cs;
struct icl_pdu *request, *response;
const struct iscsi_bhs_scsi_command *bhssc;
struct iscsi_bhs_r2t *bhsr2t;
struct cfiscsi_data_wait *cdw;
struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
uint32_t expected_len, datamove_len, r2t_off, r2t_len;
uint32_t target_transfer_tag;
bool done;
request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
cs = PDU_SESSION(request);
bhssc = (const struct iscsi_bhs_scsi_command *)request->ip_bhs;
KASSERT((bhssc->bhssc_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_COMMAND,
("bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_COMMAND"));
/*
* We need to record it so that we can properly report
* underflow/underflow.
*/
PDU_TOTAL_TRANSFER_LEN(request) = io->scsiio.kern_total_len;
/*
* Complete write underflow. Not a single byte to read. Return.
*/
expected_len = ntohl(bhssc->bhssc_expected_data_transfer_length);
if (io->scsiio.kern_rel_offset >= expected_len) {
io->scsiio.be_move_done(io);
return;
}
datamove_len = MIN(io->scsiio.kern_data_len,
expected_len - io->scsiio.kern_rel_offset);
target_transfer_tag =
atomic_fetchadd_32(&cs->cs_target_transfer_tag, 1);
cdw = cfiscsi_data_wait_new(cs, io, bhssc->bhssc_initiator_task_tag,
&target_transfer_tag);
if (cdw == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to "
"allocate memory; dropping connection");
ctl_set_busy(&io->scsiio);
io->scsiio.be_move_done(io);
cfiscsi_session_terminate(cs);
return;
}
#if 0
CFISCSI_SESSION_DEBUG(cs, "expecting Data-Out with initiator "
"task tag 0x%x, target transfer tag 0x%x",
bhssc->bhssc_initiator_task_tag, target_transfer_tag);
#endif
cdw->cdw_ctl_io = io;
cdw->cdw_target_transfer_tag = target_transfer_tag;
cdw->cdw_initiator_task_tag = bhssc->bhssc_initiator_task_tag;
cdw->cdw_r2t_end = datamove_len;
cdw->cdw_datasn = 0;
/* Set initial data pointer for the CDW respecting ext_data_filled. */
if (io->scsiio.kern_sg_entries > 0) {
ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
} else {
ctl_sglist = &ctl_sg_entry;
ctl_sglist->addr = io->scsiio.kern_data_ptr;
ctl_sglist->len = datamove_len;
}
cdw->cdw_sg_index = 0;
cdw->cdw_sg_addr = ctl_sglist[cdw->cdw_sg_index].addr;
cdw->cdw_sg_len = ctl_sglist[cdw->cdw_sg_index].len;
r2t_off = io->scsiio.ext_data_filled;
while (r2t_off > 0) {
if (r2t_off >= cdw->cdw_sg_len) {
r2t_off -= cdw->cdw_sg_len;
cdw->cdw_sg_index++;
cdw->cdw_sg_addr = ctl_sglist[cdw->cdw_sg_index].addr;
cdw->cdw_sg_len = ctl_sglist[cdw->cdw_sg_index].len;
continue;
}
cdw->cdw_sg_addr += r2t_off;
cdw->cdw_sg_len -= r2t_off;
r2t_off = 0;
}
if (cs->cs_immediate_data &&
io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled <
icl_pdu_data_segment_length(request)) {
done = cfiscsi_handle_data_segment(request, cdw);
if (done) {
cfiscsi_data_wait_free(cs, cdw);
io->scsiio.be_move_done(io);
return;
}
}
r2t_off = io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled;
r2t_len = MIN(datamove_len - io->scsiio.ext_data_filled,
cs->cs_max_burst_length);
cdw->cdw_r2t_end = io->scsiio.ext_data_filled + r2t_len;
CFISCSI_SESSION_LOCK(cs);
TAILQ_INSERT_TAIL(&cs->cs_waiting_for_data_out, cdw, cdw_next);
CFISCSI_SESSION_UNLOCK(cs);
/*
* XXX: We should limit the number of outstanding R2T PDUs
* per task to MaxOutstandingR2T.
*/
response = cfiscsi_pdu_new_response(request, M_NOWAIT);
if (response == NULL) {
CFISCSI_SESSION_WARN(cs, "failed to "
"allocate memory; dropping connection");
ctl_set_busy(&io->scsiio);
io->scsiio.be_move_done(io);
cfiscsi_session_terminate(cs);
return;
}
io->io_hdr.flags |= CTL_FLAG_DMA_INPROG;
bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs;
bhsr2t->bhsr2t_opcode = ISCSI_BHS_OPCODE_R2T;
bhsr2t->bhsr2t_flags = 0x80;
bhsr2t->bhsr2t_lun = bhssc->bhssc_lun;
bhsr2t->bhsr2t_initiator_task_tag = bhssc->bhssc_initiator_task_tag;
bhsr2t->bhsr2t_target_transfer_tag = target_transfer_tag;
/*
* XXX: Here we assume that cfiscsi_datamove() won't ever
* be running concurrently on several CPUs for a given
* command.
*/
bhsr2t->bhsr2t_r2tsn = htonl(PDU_R2TSN(request));
PDU_R2TSN(request)++;
/*
* This is the offset within the current SCSI command;
* i.e. for the first call of datamove(), it will be 0,
* and for subsequent ones it will be the sum of lengths
* of previous ones.
*
* The ext_data_filled is to account for unsolicited
* (immediate) data that might have already arrived.
*/
bhsr2t->bhsr2t_buffer_offset = htonl(r2t_off);
/*
* This is the total length (sum of S/G lengths) this call
* to cfiscsi_datamove() is supposed to handle, limited by
* MaxBurstLength.
*/
bhsr2t->bhsr2t_desired_data_transfer_length = htonl(r2t_len);
cfiscsi_pdu_queue(response);
}
static void
cfiscsi_datamove(union ctl_io *io)
{
if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_IN)
cfiscsi_datamove_in(io);
else {
/* We hadn't received anything during this datamove yet. */
io->scsiio.ext_data_filled = 0;
cfiscsi_datamove_out(io);
}
}
static void
cfiscsi_scsi_command_done(union ctl_io *io)
{
struct icl_pdu *request, *response;
struct iscsi_bhs_scsi_command *bhssc;
struct iscsi_bhs_scsi_response *bhssr;
#ifdef DIAGNOSTIC
struct cfiscsi_data_wait *cdw;
#endif
struct cfiscsi_session *cs;
uint16_t sense_length;
request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
cs = PDU_SESSION(request);
bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
KASSERT((bhssc->bhssc_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_SCSI_COMMAND,
("replying to wrong opcode 0x%x", bhssc->bhssc_opcode));
//CFISCSI_SESSION_DEBUG(cs, "initiator task tag 0x%x",
// bhssc->bhssc_initiator_task_tag);
#ifdef DIAGNOSTIC
CFISCSI_SESSION_LOCK(cs);
TAILQ_FOREACH(cdw, &cs->cs_waiting_for_data_out, cdw_next)
KASSERT(bhssc->bhssc_initiator_task_tag !=
cdw->cdw_initiator_task_tag, ("dangling cdw"));
CFISCSI_SESSION_UNLOCK(cs);
#endif
/*
* Do not return status for aborted commands.
* There are exceptions, but none supported by CTL yet.
*/
if (((io->io_hdr.flags & CTL_FLAG_ABORT) &&
(io->io_hdr.flags & CTL_FLAG_ABORT_STATUS) == 0) ||
(io->io_hdr.flags & CTL_FLAG_STATUS_SENT)) {
ctl_free_io(io);
icl_pdu_free(request);
return;
}
response = cfiscsi_pdu_new_response(request, M_WAITOK);
bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
bhssr->bhssr_opcode = ISCSI_BHS_OPCODE_SCSI_RESPONSE;
bhssr->bhssr_flags = 0x80;
/*
* XXX: We don't deal with bidirectional under/overflows;
* does anything actually support those?
*/
if (PDU_TOTAL_TRANSFER_LEN(request) <
ntohl(bhssc->bhssc_expected_data_transfer_length)) {
bhssr->bhssr_flags |= BHSSR_FLAGS_RESIDUAL_UNDERFLOW;
bhssr->bhssr_residual_count =
htonl(ntohl(bhssc->bhssc_expected_data_transfer_length) -
PDU_TOTAL_TRANSFER_LEN(request));
//CFISCSI_SESSION_DEBUG(cs, "underflow; residual count %d",
// ntohl(bhssr->bhssr_residual_count));
} else if (PDU_TOTAL_TRANSFER_LEN(request) >
ntohl(bhssc->bhssc_expected_data_transfer_length)) {
bhssr->bhssr_flags |= BHSSR_FLAGS_RESIDUAL_OVERFLOW;
bhssr->bhssr_residual_count =
htonl(PDU_TOTAL_TRANSFER_LEN(request) -
ntohl(bhssc->bhssc_expected_data_transfer_length));
//CFISCSI_SESSION_DEBUG(cs, "overflow; residual count %d",
// ntohl(bhssr->bhssr_residual_count));
}
bhssr->bhssr_response = BHSSR_RESPONSE_COMMAND_COMPLETED;
bhssr->bhssr_status = io->scsiio.scsi_status;
bhssr->bhssr_initiator_task_tag = bhssc->bhssc_initiator_task_tag;
bhssr->bhssr_expdatasn = htonl(PDU_EXPDATASN(request));
if (io->scsiio.sense_len > 0) {
#if 0
CFISCSI_SESSION_DEBUG(cs, "returning %d bytes of sense data",
io->scsiio.sense_len);
#endif
sense_length = htons(io->scsiio.sense_len);
icl_pdu_append_data(response,
&sense_length, sizeof(sense_length), M_WAITOK);
icl_pdu_append_data(response,
&io->scsiio.sense_data, io->scsiio.sense_len, M_WAITOK);
}
ctl_free_io(io);
icl_pdu_free(request);
cfiscsi_pdu_queue(response);
}
static void
cfiscsi_task_management_done(union ctl_io *io)
{
struct icl_pdu *request, *response;
struct iscsi_bhs_task_management_request *bhstmr;
struct iscsi_bhs_task_management_response *bhstmr2;
struct cfiscsi_data_wait *cdw, *tmpcdw;
struct cfiscsi_session *cs, *tcs;
struct cfiscsi_softc *softc;
int cold_reset = 0;
request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
cs = PDU_SESSION(request);
bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
KASSERT((bhstmr->bhstmr_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
ISCSI_BHS_OPCODE_TASK_REQUEST,
("replying to wrong opcode 0x%x", bhstmr->bhstmr_opcode));
#if 0
CFISCSI_SESSION_DEBUG(cs, "initiator task tag 0x%x; referenced task tag 0x%x",
bhstmr->bhstmr_initiator_task_tag,
bhstmr->bhstmr_referenced_task_tag);
#endif
if ((bhstmr->bhstmr_function & ~0x80) ==
BHSTMR_FUNCTION_ABORT_TASK) {
/*
* Make sure we no longer wait for Data-Out for this command.
*/
CFISCSI_SESSION_LOCK(cs);
TAILQ_FOREACH_SAFE(cdw,
&cs->cs_waiting_for_data_out, cdw_next, tmpcdw) {
if (bhstmr->bhstmr_referenced_task_tag !=
cdw->cdw_initiator_task_tag)
continue;
#if 0
CFISCSI_SESSION_DEBUG(cs, "removing csw for initiator task "
"tag 0x%x", bhstmr->bhstmr_initiator_task_tag);
#endif
TAILQ_REMOVE(&cs->cs_waiting_for_data_out,
cdw, cdw_next);
io->io_hdr.flags &= ~CTL_FLAG_DMA_INPROG;
cdw->cdw_ctl_io->scsiio.io_hdr.port_status = 43;
cdw->cdw_ctl_io->scsiio.be_move_done(cdw->cdw_ctl_io);
cfiscsi_data_wait_free(cs, cdw);
}
CFISCSI_SESSION_UNLOCK(cs);
}
if ((bhstmr->bhstmr_function & ~0x80) ==
BHSTMR_FUNCTION_TARGET_COLD_RESET &&
io->io_hdr.status == CTL_SUCCESS)
cold_reset = 1;
response = cfiscsi_pdu_new_response(request, M_WAITOK);
bhstmr2 = (struct iscsi_bhs_task_management_response *)
response->ip_bhs;
bhstmr2->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_RESPONSE;
bhstmr2->bhstmr_flags = 0x80;
switch (io->taskio.task_status) {
case CTL_TASK_FUNCTION_COMPLETE:
bhstmr2->bhstmr_response = BHSTMR_RESPONSE_FUNCTION_COMPLETE;
break;
case CTL_TASK_FUNCTION_SUCCEEDED:
bhstmr2->bhstmr_response = BHSTMR_RESPONSE_FUNCTION_SUCCEEDED;
break;
case CTL_TASK_LUN_DOES_NOT_EXIST:
bhstmr2->bhstmr_response = BHSTMR_RESPONSE_LUN_DOES_NOT_EXIST;
break;
case CTL_TASK_FUNCTION_NOT_SUPPORTED:
default:
bhstmr2->bhstmr_response = BHSTMR_RESPONSE_FUNCTION_NOT_SUPPORTED;
break;
}
memcpy(bhstmr2->bhstmr_additional_reponse_information,
io->taskio.task_resp, sizeof(io->taskio.task_resp));
bhstmr2->bhstmr_initiator_task_tag = bhstmr->bhstmr_initiator_task_tag;
ctl_free_io(io);
icl_pdu_free(request);
cfiscsi_pdu_queue(response);
if (cold_reset) {
softc = cs->cs_target->ct_softc;
mtx_lock(&softc->lock);
TAILQ_FOREACH(tcs, &softc->sessions, cs_next) {
if (tcs->cs_target == cs->cs_target)
cfiscsi_session_terminate(tcs);
}
mtx_unlock(&softc->lock);
}
}
static void
cfiscsi_done(union ctl_io *io)
{
struct icl_pdu *request;
struct cfiscsi_session *cs;
KASSERT(((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE),
("invalid CTL status %#x", io->io_hdr.status));
if (io->io_hdr.io_type == CTL_IO_TASK &&
io->taskio.task_action == CTL_TASK_I_T_NEXUS_RESET) {
/*
* Implicit task termination has just completed; nothing to do.
*/
cs = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
cs->cs_tasks_aborted = true;
refcount_release(&cs->cs_outstanding_ctl_pdus);
wakeup(__DEVOLATILE(void *, &cs->cs_outstanding_ctl_pdus));
ctl_free_io(io);
return;
}
request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
cs = PDU_SESSION(request);
switch (request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) {
case ISCSI_BHS_OPCODE_SCSI_COMMAND:
cfiscsi_scsi_command_done(io);
break;
case ISCSI_BHS_OPCODE_TASK_REQUEST:
cfiscsi_task_management_done(io);
break;
default:
panic("cfiscsi_done called with wrong opcode 0x%x",
request->ip_bhs->bhs_opcode);
}
refcount_release(&cs->cs_outstanding_ctl_pdus);
}
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