sys/cam/ctl/ctl_frontend_iscsi.c

   1 /*-
   2  * Copyright (c) 2012 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Edward Tomasz Napierala under sponsorship
   6  * from the FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD$
  30  */
  31
  32 /*
  33  * CTL frontend for the iSCSI protocol.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/param.h>
  40 #include <sys/capsicum.h>
  41 #include <sys/condvar.h>
  42 #include <sys/endian.h>
  43 #include <sys/file.h>
  44 #include <sys/kernel.h>
  45 #include <sys/kthread.h>
  46 #include <sys/lock.h>
  47 #include <sys/malloc.h>
  48 #include <sys/module.h>
  49 #include <sys/mutex.h>
  50 #include <sys/queue.h>
  51 #include <sys/sbuf.h>
  52 #include <sys/socket.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/systm.h>
  55 #include <sys/uio.h>
  56 #include <sys/unistd.h>
  57 #include <vm/uma.h>
  58
  59 #include <cam/scsi/scsi_all.h>
  60 #include <cam/scsi/scsi_da.h>
  61 #include <cam/ctl/ctl_io.h>
  62 #include <cam/ctl/ctl.h>
  63 #include <cam/ctl/ctl_backend.h>
  64 #include <cam/ctl/ctl_error.h>
  65 #include <cam/ctl/ctl_frontend.h>
  66 #include <cam/ctl/ctl_debug.h>
  67 #include <cam/ctl/ctl_ha.h>
  68 #include <cam/ctl/ctl_ioctl.h>
  69 #include <cam/ctl/ctl_private.h>
  70
  71 #include <dev/iscsi/icl.h>
  72 #include <dev/iscsi/icl_wrappers.h>
  73 #include <dev/iscsi/iscsi_proto.h>
  74 #include <cam/ctl/ctl_frontend_iscsi.h>
  75
  76 #ifdef ICL_KERNEL_PROXY
  77 #include <sys/socketvar.h>
  78 #endif
  79
  80 #ifdef ICL_KERNEL_PROXY
  81 FEATURE(cfiscsi_kernel_proxy, "iSCSI target built with ICL_KERNEL_PROXY");
  82 #endif
  83
  84 static MALLOC_DEFINE(M_CFISCSI, "cfiscsi", "Memory used for CTL iSCSI frontend");
  85 static uma_zone_t cfiscsi_data_wait_zone;
  86
  87 SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, iscsi, CTLFLAG_RD, 0,
  88     "CAM Target Layer iSCSI Frontend");
  89 static int debug = 1;
  90 SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN,
  91     &debug, 1, "Enable debug messages");
  92 static int ping_timeout = 5;
  93 SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RWTUN,
  94     &ping_timeout, 5, "Interval between ping (NOP-Out) requests, in seconds");
  95 static int login_timeout = 60;
  96 SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, login_timeout, CTLFLAG_RWTUN,
  97     &login_timeout, 60, "Time to wait for ctld(8) to finish Login Phase, in seconds");
  98 static int maxtags = 256;
  99 SYSCTL_INT(_kern_cam_ctl_iscsi, OID_AUTO, maxtags, CTLFLAG_RWTUN,
 100     &maxtags, 0, "Max number of requests queued by initiator");
 101
 102 #define CFISCSI_DEBUG(X, ...)                                           \
 103         do {                                                            \
 104                 if (debug > 1) {                                        \
 105                         printf("%s: " X "\n",                           \
 106                             __func__, ## __VA_ARGS__);                  \
 107                 }                                                       \
 108         } while (0)
 109
 110 #define CFISCSI_WARN(X, ...)                                            \
 111         do {                                                            \
 112                 if (debug > 0) {                                        \
 113                         printf("WARNING: %s: " X "\n",                  \
 114                             __func__, ## __VA_ARGS__);                  \
 115                 }                                                       \
 116         } while (0)
 117
 118 #define CFISCSI_SESSION_DEBUG(S, X, ...)                                \
 119         do {                                                            \
 120                 if (debug > 1) {                                        \
 121                         printf("%s: %s (%s): " X "\n",                  \
 122                             __func__, S->cs_initiator_addr,             \
 123                             S->cs_initiator_name, ## __VA_ARGS__);      \
 124                 }                                                       \
 125         } while (0)
 126
 127 #define CFISCSI_SESSION_WARN(S, X, ...)                                 \
 128         do  {                                                           \
 129                 if (debug > 0) {                                        \
 130                         printf("WARNING: %s (%s): " X "\n",             \
 131                             S->cs_initiator_addr,                       \
 132                             S->cs_initiator_name, ## __VA_ARGS__);      \
 133                 }                                                       \
 134         } while (0)
 135
 136 #define CFISCSI_SESSION_LOCK(X)         mtx_lock(&X->cs_lock)
 137 #define CFISCSI_SESSION_UNLOCK(X)       mtx_unlock(&X->cs_lock)
 138 #define CFISCSI_SESSION_LOCK_ASSERT(X)  mtx_assert(&X->cs_lock, MA_OWNED)
 139
 140 #define CONN_SESSION(X)                 ((struct cfiscsi_session *)(X)->ic_prv0)
 141 #define PDU_SESSION(X)                  CONN_SESSION((X)->ip_conn)
 142 #define PDU_EXPDATASN(X)                (X)->ip_prv0
 143 #define PDU_TOTAL_TRANSFER_LEN(X)       (X)->ip_prv1
 144 #define PDU_R2TSN(X)                    (X)->ip_prv2
 145
 146 static int      cfiscsi_init(void);
 147 static int      cfiscsi_shutdown(void);
 148 static void     cfiscsi_online(void *arg);
 149 static void     cfiscsi_offline(void *arg);
 150 static int      cfiscsi_info(void *arg, struct sbuf *sb);
 151 static int      cfiscsi_ioctl(struct cdev *dev,
 152                     u_long cmd, caddr_t addr, int flag, struct thread *td);
 153 static void     cfiscsi_datamove(union ctl_io *io);
 154 static void     cfiscsi_datamove_in(union ctl_io *io);
 155 static void     cfiscsi_datamove_out(union ctl_io *io);
 156 static void     cfiscsi_done(union ctl_io *io);
 157 static bool     cfiscsi_pdu_update_cmdsn(const struct icl_pdu *request);
 158 static void     cfiscsi_pdu_handle_nop_out(struct icl_pdu *request);
 159 static void     cfiscsi_pdu_handle_scsi_command(struct icl_pdu *request);
 160 static void     cfiscsi_pdu_handle_task_request(struct icl_pdu *request);
 161 static void     cfiscsi_pdu_handle_data_out(struct icl_pdu *request);
 162 static void     cfiscsi_pdu_handle_logout_request(struct icl_pdu *request);
 163 static void     cfiscsi_session_terminate(struct cfiscsi_session *cs);
 164 static struct cfiscsi_data_wait *cfiscsi_data_wait_new(
 165                     struct cfiscsi_session *cs, union ctl_io *io,
 166                     uint32_t initiator_task_tag,
 167                     uint32_t *target_transfer_tagp);
 168 static void     cfiscsi_data_wait_free(struct cfiscsi_session *cs,
 169                     struct cfiscsi_data_wait *cdw);
 170 static struct cfiscsi_target    *cfiscsi_target_find(struct cfiscsi_softc
 171                     *softc, const char *name, uint16_t tag);
 172 static struct cfiscsi_target    *cfiscsi_target_find_or_create(
 173     struct cfiscsi_softc *softc, const char *name, const char *alias,
 174     uint16_t tag);
 175 static void     cfiscsi_target_release(struct cfiscsi_target *ct);
 176 static void     cfiscsi_session_delete(struct cfiscsi_session *cs);
 177
 178 static struct cfiscsi_softc cfiscsi_softc;
 179
 180 static struct ctl_frontend cfiscsi_frontend =
 181 {
 182         .name = "iscsi",
 183         .init = cfiscsi_init,
 184         .ioctl = cfiscsi_ioctl,
 185         .shutdown = cfiscsi_shutdown,
 186 };
 187 CTL_FRONTEND_DECLARE(cfiscsi, cfiscsi_frontend);
 188 MODULE_DEPEND(cfiscsi, icl, 1, 1, 1);
 189
 190 static struct icl_pdu *
 191 cfiscsi_pdu_new_response(struct icl_pdu *request, int flags)
 192 {
 193
 194         return (icl_pdu_new(request->ip_conn, flags));
 195 }
 196
 197 static bool
 198 cfiscsi_pdu_update_cmdsn(const struct icl_pdu *request)
 199 {
 200         const struct iscsi_bhs_scsi_command *bhssc;
 201         struct cfiscsi_session *cs;
 202         uint32_t cmdsn, expstatsn;
 203
 204         cs = PDU_SESSION(request);
 205
 206         /*
 207          * Every incoming PDU - not just NOP-Out - resets the ping timer.
 208          * The purpose of the timeout is to reset the connection when it stalls;
 209          * we don't want this to happen when NOP-In or NOP-Out ends up delayed
 210          * in some queue.
 211          *
 212          * XXX: Locking?
 213          */
 214         cs->cs_timeout = 0;
 215
 216         /*
 217          * Data-Out PDUs don't contain CmdSN.
 218          */
 219         if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
 220             ISCSI_BHS_OPCODE_SCSI_DATA_OUT)
 221                 return (false);
 222
 223         /*
 224          * We're only using fields common for all the request
 225          * (initiator -> target) PDUs.
 226          */
 227         bhssc = (const struct iscsi_bhs_scsi_command *)request->ip_bhs;
 228         cmdsn = ntohl(bhssc->bhssc_cmdsn);
 229         expstatsn = ntohl(bhssc->bhssc_expstatsn);
 230
 231         CFISCSI_SESSION_LOCK(cs);
 232 #if 0
 233         if (expstatsn != cs->cs_statsn) {
 234                 CFISCSI_SESSION_DEBUG(cs, "received PDU with ExpStatSN %d, "
 235                     "while current StatSN is %d", expstatsn,
 236                     cs->cs_statsn);
 237         }
 238 #endif
 239
 240         if ((request->ip_bhs->bhs_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) {
 241                 /*
 242                  * The target MUST silently ignore any non-immediate command
 243                  * outside of this range.
 244                  */
 245                 if (ISCSI_SNLT(cmdsn, cs->cs_cmdsn) ||
 246                     ISCSI_SNGT(cmdsn, cs->cs_cmdsn - 1 + maxtags)) {
 247                         CFISCSI_SESSION_UNLOCK(cs);
 248                         CFISCSI_SESSION_WARN(cs, "received PDU with CmdSN %u, "
 249                             "while expected %u", cmdsn, cs->cs_cmdsn);
 250                         return (true);
 251                 }
 252
 253                 /*
 254                  * We don't support multiple connections now, so any
 255                  * discontinuity in CmdSN means lost PDUs.  Since we don't
 256                  * support PDU retransmission -- terminate the connection.
 257                  */
 258                 if (cmdsn != cs->cs_cmdsn) {
 259                         CFISCSI_SESSION_UNLOCK(cs);
 260                         CFISCSI_SESSION_WARN(cs, "received PDU with CmdSN %u, "
 261                             "while expected %u; dropping connection",
 262                             cmdsn, cs->cs_cmdsn);
 263                         cfiscsi_session_terminate(cs);
 264                         return (true);
 265                 }
 266                 cs->cs_cmdsn++;
 267         }
 268
 269         CFISCSI_SESSION_UNLOCK(cs);
 270
 271         return (false);
 272 }
 273
 274 static void
 275 cfiscsi_pdu_handle(struct icl_pdu *request)
 276 {
 277         struct cfiscsi_session *cs;
 278         bool ignore;
 279
 280         cs = PDU_SESSION(request);
 281
 282         ignore = cfiscsi_pdu_update_cmdsn(request);
 283         if (ignore) {
 284                 icl_pdu_free(request);
 285                 return;
 286         }
 287
 288         /*
 289          * Handle the PDU; this includes e.g. receiving the remaining
 290          * part of PDU and submitting the SCSI command to CTL
 291          * or queueing a reply.  The handling routine is responsible
 292          * for freeing the PDU when it's no longer needed.
 293          */
 294         switch (request->ip_bhs->bhs_opcode &
 295             ~ISCSI_BHS_OPCODE_IMMEDIATE) {
 296         case ISCSI_BHS_OPCODE_NOP_OUT:
 297                 cfiscsi_pdu_handle_nop_out(request);
 298                 break;
 299         case ISCSI_BHS_OPCODE_SCSI_COMMAND:
 300                 cfiscsi_pdu_handle_scsi_command(request);
 301                 break;
 302         case ISCSI_BHS_OPCODE_TASK_REQUEST:
 303                 cfiscsi_pdu_handle_task_request(request);
 304                 break;
 305         case ISCSI_BHS_OPCODE_SCSI_DATA_OUT:
 306                 cfiscsi_pdu_handle_data_out(request);
 307                 break;
 308         case ISCSI_BHS_OPCODE_LOGOUT_REQUEST:
 309                 cfiscsi_pdu_handle_logout_request(request);
 310                 break;
 311         default:
 312                 CFISCSI_SESSION_WARN(cs, "received PDU with unsupported "
 313                     "opcode 0x%x; dropping connection",
 314                     request->ip_bhs->bhs_opcode);
 315                 icl_pdu_free(request);
 316                 cfiscsi_session_terminate(cs);
 317         }
 318
 319 }
 320
 321 static void
 322 cfiscsi_receive_callback(struct icl_pdu *request)
 323 {
 324 #ifdef ICL_KERNEL_PROXY
 325         struct cfiscsi_session *cs;
 326
 327         cs = PDU_SESSION(request);
 328         if (cs->cs_waiting_for_ctld || cs->cs_login_phase) {
 329                 if (cs->cs_login_pdu == NULL)
 330                         cs->cs_login_pdu = request;
 331                 else
 332                         icl_pdu_free(request);
 333                 cv_signal(&cs->cs_login_cv);
 334                 return;
 335         }
 336 #endif
 337
 338         cfiscsi_pdu_handle(request);
 339 }
 340
 341 static void
 342 cfiscsi_error_callback(struct icl_conn *ic)
 343 {
 344         struct cfiscsi_session *cs;
 345
 346         cs = CONN_SESSION(ic);
 347
 348         CFISCSI_SESSION_WARN(cs, "connection error; dropping connection");
 349         cfiscsi_session_terminate(cs);
 350 }
 351
 352 static int
 353 cfiscsi_pdu_prepare(struct icl_pdu *response)
 354 {
 355         struct cfiscsi_session *cs;
 356         struct iscsi_bhs_scsi_response *bhssr;
 357         bool advance_statsn = true;
 358
 359         cs = PDU_SESSION(response);
 360
 361         CFISCSI_SESSION_LOCK_ASSERT(cs);
 362
 363         /*
 364          * We're only using fields common for all the response
 365          * (target -> initiator) PDUs.
 366          */
 367         bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
 368
 369         /*
 370          * 10.8.3: "The StatSN for this connection is not advanced
 371          * after this PDU is sent."
 372          */
 373         if (bhssr->bhssr_opcode == ISCSI_BHS_OPCODE_R2T)
 374                 advance_statsn = false;
 375
 376         /*
 377          * 10.19.2: "However, when the Initiator Task Tag is set to 0xffffffff,
 378          * StatSN for the connection is not advanced after this PDU is sent."
 379          */
 380         if (bhssr->bhssr_opcode == ISCSI_BHS_OPCODE_NOP_IN &&
 381             bhssr->bhssr_initiator_task_tag == 0xffffffff)
 382                 advance_statsn = false;
 383
 384         /*
 385          * See the comment below - StatSN is not meaningful and must
 386          * not be advanced.
 387          */
 388         if (bhssr->bhssr_opcode == ISCSI_BHS_OPCODE_SCSI_DATA_IN &&
 389             (bhssr->bhssr_flags & BHSDI_FLAGS_S) == 0)
 390                 advance_statsn = false;
 391
 392         /*
 393          * 10.7.3: "The fields StatSN, Status, and Residual Count
 394          * only have meaningful content if the S bit is set to 1."
 395          */
 396         if (bhssr->bhssr_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN ||
 397             (bhssr->bhssr_flags & BHSDI_FLAGS_S))
 398                 bhssr->bhssr_statsn = htonl(cs->cs_statsn);
 399         bhssr->bhssr_expcmdsn = htonl(cs->cs_cmdsn);
 400         bhssr->bhssr_maxcmdsn = htonl(cs->cs_cmdsn - 1 +
 401             imax(0, maxtags - cs->cs_outstanding_ctl_pdus));
 402
 403         if (advance_statsn)
 404                 cs->cs_statsn++;
 405
 406         return (0);
 407 }
 408
 409 static void
 410 cfiscsi_pdu_queue(struct icl_pdu *response)
 411 {
 412         struct cfiscsi_session *cs;
 413
 414         cs = PDU_SESSION(response);
 415
 416         CFISCSI_SESSION_LOCK(cs);
 417         cfiscsi_pdu_prepare(response);
 418         icl_pdu_queue(response);
 419         CFISCSI_SESSION_UNLOCK(cs);
 420 }
 421
 422 static void
 423 cfiscsi_pdu_handle_nop_out(struct icl_pdu *request)
 424 {
 425         struct cfiscsi_session *cs;
 426         struct iscsi_bhs_nop_out *bhsno;
 427         struct iscsi_bhs_nop_in *bhsni;
 428         struct icl_pdu *response;
 429         void *data = NULL;
 430         size_t datasize;
 431         int error;
 432
 433         cs = PDU_SESSION(request);
 434         bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs;
 435
 436         if (bhsno->bhsno_initiator_task_tag == 0xffffffff) {
 437                 /*
 438                  * Nothing to do, iscsi_pdu_update_statsn() already
 439                  * zeroed the timeout.
 440                  */
 441                 icl_pdu_free(request);
 442                 return;
 443         }
 444
 445         datasize = icl_pdu_data_segment_length(request);
 446         if (datasize > 0) {
 447                 data = malloc(datasize, M_CFISCSI, M_NOWAIT | M_ZERO);
 448                 if (data == NULL) {
 449                         CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
 450                             "dropping connection");
 451                         icl_pdu_free(request);
 452                         cfiscsi_session_terminate(cs);
 453                         return;
 454                 }
 455                 icl_pdu_get_data(request, 0, data, datasize);
 456         }
 457
 458         response = cfiscsi_pdu_new_response(request, M_NOWAIT);
 459         if (response == NULL) {
 460                 CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
 461                     "droppping connection");
 462                 free(data, M_CFISCSI);
 463                 icl_pdu_free(request);
 464                 cfiscsi_session_terminate(cs);
 465                 return;
 466         }
 467         bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs;
 468         bhsni->bhsni_opcode = ISCSI_BHS_OPCODE_NOP_IN;
 469         bhsni->bhsni_flags = 0x80;
 470         bhsni->bhsni_initiator_task_tag = bhsno->bhsno_initiator_task_tag;
 471         bhsni->bhsni_target_transfer_tag = 0xffffffff;
 472         if (datasize > 0) {
 473                 error = icl_pdu_append_data(response, data, datasize, M_NOWAIT);
 474                 if (error != 0) {
 475                         CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
 476                             "dropping connection");
 477                         free(data, M_CFISCSI);
 478                         icl_pdu_free(request);
 479                         icl_pdu_free(response);
 480                         cfiscsi_session_terminate(cs);
 481                         return;
 482                 }
 483                 free(data, M_CFISCSI);
 484         }
 485
 486         icl_pdu_free(request);
 487         cfiscsi_pdu_queue(response);
 488 }
 489
 490 static void
 491 cfiscsi_pdu_handle_scsi_command(struct icl_pdu *request)
 492 {
 493         struct iscsi_bhs_scsi_command *bhssc;
 494         struct cfiscsi_session *cs;
 495         union ctl_io *io;
 496         int error;
 497
 498         cs = PDU_SESSION(request);
 499         bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
 500         //CFISCSI_SESSION_DEBUG(cs, "initiator task tag 0x%x",
 501         //    bhssc->bhssc_initiator_task_tag);
 502
 503         if (request->ip_data_len > 0 && cs->cs_immediate_data == false) {
 504                 CFISCSI_SESSION_WARN(cs, "unsolicited data with "
 505                     "ImmediateData=No; dropping connection");
 506                 icl_pdu_free(request);
 507                 cfiscsi_session_terminate(cs);
 508                 return;
 509         }
 510         io = ctl_alloc_io(cs->cs_target->ct_port.ctl_pool_ref);
 511         ctl_zero_io(io);
 512         io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = request;
 513         io->io_hdr.io_type = CTL_IO_SCSI;
 514         io->io_hdr.nexus.initid = cs->cs_ctl_initid;
 515         io->io_hdr.nexus.targ_port = cs->cs_target->ct_port.targ_port;
 516         io->io_hdr.nexus.targ_lun = ctl_decode_lun(be64toh(bhssc->bhssc_lun));
 517         io->scsiio.tag_num = bhssc->bhssc_initiator_task_tag;
 518         switch ((bhssc->bhssc_flags & BHSSC_FLAGS_ATTR)) {
 519         case BHSSC_FLAGS_ATTR_UNTAGGED:
 520                 io->scsiio.tag_type = CTL_TAG_UNTAGGED;
 521                 break;
 522         case BHSSC_FLAGS_ATTR_SIMPLE:
 523                 io->scsiio.tag_type = CTL_TAG_SIMPLE;
 524                 break;
 525         case BHSSC_FLAGS_ATTR_ORDERED:
 526                 io->scsiio.tag_type = CTL_TAG_ORDERED;
 527                 break;
 528         case BHSSC_FLAGS_ATTR_HOQ:
 529                 io->scsiio.tag_type = CTL_TAG_HEAD_OF_QUEUE;
 530                 break;
 531         case BHSSC_FLAGS_ATTR_ACA:
 532                 io->scsiio.tag_type = CTL_TAG_ACA;
 533                 break;
 534         default:
 535                 io->scsiio.tag_type = CTL_TAG_UNTAGGED;
 536                 CFISCSI_SESSION_WARN(cs, "unhandled tag type %d",
 537                     bhssc->bhssc_flags & BHSSC_FLAGS_ATTR);
 538                 break;
 539         }
 540         io->scsiio.cdb_len = sizeof(bhssc->bhssc_cdb); /* Which is 16. */
 541         memcpy(io->scsiio.cdb, bhssc->bhssc_cdb, sizeof(bhssc->bhssc_cdb));
 542         refcount_acquire(&cs->cs_outstanding_ctl_pdus);
 543         error = ctl_queue(io);
 544         if (error != CTL_RETVAL_COMPLETE) {
 545                 CFISCSI_SESSION_WARN(cs, "ctl_queue() failed; error %d; "
 546                     "dropping connection", error);
 547                 ctl_free_io(io);
 548                 refcount_release(&cs->cs_outstanding_ctl_pdus);
 549                 icl_pdu_free(request);
 550                 cfiscsi_session_terminate(cs);
 551         }
 552 }
 553
 554 static void
 555 cfiscsi_pdu_handle_task_request(struct icl_pdu *request)
 556 {
 557         struct iscsi_bhs_task_management_request *bhstmr;
 558         struct iscsi_bhs_task_management_response *bhstmr2;
 559         struct icl_pdu *response;
 560         struct cfiscsi_session *cs;
 561         union ctl_io *io;
 562         int error;
 563
 564         cs = PDU_SESSION(request);
 565         bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
 566         io = ctl_alloc_io(cs->cs_target->ct_port.ctl_pool_ref);
 567         ctl_zero_io(io);
 568         io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = request;
 569         io->io_hdr.io_type = CTL_IO_TASK;
 570         io->io_hdr.nexus.initid = cs->cs_ctl_initid;
 571         io->io_hdr.nexus.targ_port = cs->cs_target->ct_port.targ_port;
 572         io->io_hdr.nexus.targ_lun = ctl_decode_lun(be64toh(bhstmr->bhstmr_lun));
 573         io->taskio.tag_type = CTL_TAG_SIMPLE; /* XXX */
 574
 575         switch (bhstmr->bhstmr_function & ~0x80) {
 576         case BHSTMR_FUNCTION_ABORT_TASK:
 577 #if 0
 578                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_ABORT_TASK");
 579 #endif
 580                 io->taskio.task_action = CTL_TASK_ABORT_TASK;
 581                 io->taskio.tag_num = bhstmr->bhstmr_referenced_task_tag;
 582                 break;
 583         case BHSTMR_FUNCTION_ABORT_TASK_SET:
 584 #if 0
 585                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_ABORT_TASK_SET");
 586 #endif
 587                 io->taskio.task_action = CTL_TASK_ABORT_TASK_SET;
 588                 break;
 589         case BHSTMR_FUNCTION_CLEAR_TASK_SET:
 590 #if 0
 591                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_CLEAR_TASK_SET");
 592 #endif
 593                 io->taskio.task_action = CTL_TASK_CLEAR_TASK_SET;
 594                 break;
 595         case BHSTMR_FUNCTION_LOGICAL_UNIT_RESET:
 596 #if 0
 597                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_LOGICAL_UNIT_RESET");
 598 #endif
 599                 io->taskio.task_action = CTL_TASK_LUN_RESET;
 600                 break;
 601         case BHSTMR_FUNCTION_TARGET_WARM_RESET:
 602 #if 0
 603                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_TARGET_WARM_RESET");
 604 #endif
 605                 io->taskio.task_action = CTL_TASK_TARGET_RESET;
 606                 break;
 607         case BHSTMR_FUNCTION_TARGET_COLD_RESET:
 608 #if 0
 609                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_TARGET_COLD_RESET");
 610 #endif
 611                 io->taskio.task_action = CTL_TASK_TARGET_RESET;
 612                 break;
 613         case BHSTMR_FUNCTION_QUERY_TASK:
 614 #if 0
 615                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_QUERY_TASK");
 616 #endif
 617                 io->taskio.task_action = CTL_TASK_QUERY_TASK;
 618                 io->taskio.tag_num = bhstmr->bhstmr_referenced_task_tag;
 619                 break;
 620         case BHSTMR_FUNCTION_QUERY_TASK_SET:
 621 #if 0
 622                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_QUERY_TASK_SET");
 623 #endif
 624                 io->taskio.task_action = CTL_TASK_QUERY_TASK_SET;
 625                 break;
 626         case BHSTMR_FUNCTION_I_T_NEXUS_RESET:
 627 #if 0
 628                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_I_T_NEXUS_RESET");
 629 #endif
 630                 io->taskio.task_action = CTL_TASK_I_T_NEXUS_RESET;
 631                 break;
 632         case BHSTMR_FUNCTION_QUERY_ASYNC_EVENT:
 633 #if 0
 634                 CFISCSI_SESSION_DEBUG(cs, "BHSTMR_FUNCTION_QUERY_ASYNC_EVENT");
 635 #endif
 636                 io->taskio.task_action = CTL_TASK_QUERY_ASYNC_EVENT;
 637                 break;
 638         default:
 639                 CFISCSI_SESSION_DEBUG(cs, "unsupported function 0x%x",
 640                     bhstmr->bhstmr_function & ~0x80);
 641                 ctl_free_io(io);
 642
 643                 response = cfiscsi_pdu_new_response(request, M_NOWAIT);
 644                 if (response == NULL) {
 645                         CFISCSI_SESSION_WARN(cs, "failed to allocate memory; "
 646                             "dropping connection");
 647                         icl_pdu_free(request);
 648                         cfiscsi_session_terminate(cs);
 649                         return;
 650                 }
 651                 bhstmr2 = (struct iscsi_bhs_task_management_response *)
 652                     response->ip_bhs;
 653                 bhstmr2->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_RESPONSE;
 654                 bhstmr2->bhstmr_flags = 0x80;
 655                 bhstmr2->bhstmr_response =
 656                     BHSTMR_RESPONSE_FUNCTION_NOT_SUPPORTED;
 657                 bhstmr2->bhstmr_initiator_task_tag =
 658                     bhstmr->bhstmr_initiator_task_tag;
 659                 icl_pdu_free(request);
 660                 cfiscsi_pdu_queue(response);
 661                 return;
 662         }
 663
 664         refcount_acquire(&cs->cs_outstanding_ctl_pdus);
 665         error = ctl_queue(io);
 666         if (error != CTL_RETVAL_COMPLETE) {
 667                 CFISCSI_SESSION_WARN(cs, "ctl_queue() failed; error %d; "
 668                     "dropping connection", error);
 669                 ctl_free_io(io);
 670                 refcount_release(&cs->cs_outstanding_ctl_pdus);
 671                 icl_pdu_free(request);
 672                 cfiscsi_session_terminate(cs);
 673         }
 674 }
 675
 676 static bool
 677 cfiscsi_handle_data_segment(struct icl_pdu *request, struct cfiscsi_data_wait *cdw)
 678 {
 679         struct iscsi_bhs_data_out *bhsdo;
 680         struct cfiscsi_session *cs;
 681         struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
 682         size_t copy_len, len, off, buffer_offset;
 683         int ctl_sg_count;
 684         union ctl_io *io;
 685
 686         cs = PDU_SESSION(request);
 687
 688         KASSERT((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
 689             ISCSI_BHS_OPCODE_SCSI_DATA_OUT ||
 690             (request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
 691             ISCSI_BHS_OPCODE_SCSI_COMMAND,
 692             ("bad opcode 0x%x", request->ip_bhs->bhs_opcode));
 693
 694         /*
 695          * We're only using fields common for Data-Out and SCSI Command PDUs.
 696          */
 697         bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
 698
 699         io = cdw->cdw_ctl_io;
 700         KASSERT((io->io_hdr.flags & CTL_FLAG_DATA_MASK) != CTL_FLAG_DATA_IN,
 701             ("CTL_FLAG_DATA_IN"));
 702
 703 #if 0
 704         CFISCSI_SESSION_DEBUG(cs, "received %zd bytes out of %d",
 705             request->ip_data_len, io->scsiio.kern_total_len);
 706 #endif
 707
 708         if (io->scsiio.kern_sg_entries > 0) {
 709                 ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
 710                 ctl_sg_count = io->scsiio.kern_sg_entries;
 711         } else {
 712                 ctl_sglist = &ctl_sg_entry;
 713                 ctl_sglist->addr = io->scsiio.kern_data_ptr;
 714                 ctl_sglist->len = io->scsiio.kern_data_len;
 715                 ctl_sg_count = 1;
 716         }
 717
 718         if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
 719             ISCSI_BHS_OPCODE_SCSI_DATA_OUT)
 720                 buffer_offset = ntohl(bhsdo->bhsdo_buffer_offset);
 721         else
 722                 buffer_offset = 0;
 723         len = icl_pdu_data_segment_length(request);
 724
 725         /*
 726          * Make sure the offset, as sent by the initiator, matches the offset
 727          * we're supposed to be at in the scatter-gather list.
 728          */
 729         if (buffer_offset >
 730             io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled ||
 731             buffer_offset + len <=
 732             io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled) {
 733                 CFISCSI_SESSION_WARN(cs, "received bad buffer offset %zd, "
 734                     "expected %zd; dropping connection", buffer_offset,
 735                     (size_t)io->scsiio.kern_rel_offset +
 736                     (size_t)io->scsiio.ext_data_filled);
 737                 ctl_set_data_phase_error(&io->scsiio);
 738                 cfiscsi_session_terminate(cs);
 739                 return (true);
 740         }
 741
 742         /*
 743          * This is the offset within the PDU data segment, as opposed
 744          * to buffer_offset, which is the offset within the task (SCSI
 745          * command).
 746          */
 747         off = io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled -
 748             buffer_offset;
 749
 750         /*
 751          * Iterate over the scatter/gather segments, filling them with data
 752          * from the PDU data segment.  Note that this can get called multiple
 753          * times for one SCSI command; the cdw structure holds state for the
 754          * scatter/gather list.
 755          */
 756         for (;;) {
 757                 KASSERT(cdw->cdw_sg_index < ctl_sg_count,
 758                     ("cdw->cdw_sg_index >= ctl_sg_count"));
 759                 if (cdw->cdw_sg_len == 0) {
 760                         cdw->cdw_sg_addr = ctl_sglist[cdw->cdw_sg_index].addr;
 761                         cdw->cdw_sg_len = ctl_sglist[cdw->cdw_sg_index].len;
 762                 }
 763                 KASSERT(off <= len, ("len > off"));
 764                 copy_len = len - off;
 765                 if (copy_len > cdw->cdw_sg_len)
 766                         copy_len = cdw->cdw_sg_len;
 767
 768                 icl_pdu_get_data(request, off, cdw->cdw_sg_addr, copy_len);
 769                 cdw->cdw_sg_addr += copy_len;
 770                 cdw->cdw_sg_len -= copy_len;
 771                 off += copy_len;
 772                 io->scsiio.ext_data_filled += copy_len;
 773                 io->scsiio.kern_data_resid -= copy_len;
 774
 775                 if (cdw->cdw_sg_len == 0) {
 776                         /*
 777                          * End of current segment.
 778                          */
 779                         if (cdw->cdw_sg_index == ctl_sg_count - 1) {
 780                                 /*
 781                                  * Last segment in scatter/gather list.
 782                                  */
 783                                 break;
 784                         }
 785                         cdw->cdw_sg_index++;
 786                 }
 787
 788                 if (off == len) {
 789                         /*
 790                          * End of PDU payload.
 791                          */
 792                         break;
 793                 }
 794         }
 795
 796         if (len > off) {
 797                 /*
 798                  * In case of unsolicited data, it's possible that the buffer
 799                  * provided by CTL is smaller than negotiated FirstBurstLength.
 800                  * Just ignore the superfluous data; will ask for them with R2T
 801                  * on next call to cfiscsi_datamove().
 802                  *
 803                  * This obviously can only happen with SCSI Command PDU.
 804                  */
 805                 if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
 806                     ISCSI_BHS_OPCODE_SCSI_COMMAND)
 807                         return (true);
 808
 809                 CFISCSI_SESSION_WARN(cs, "received too much data: got %zd bytes, "
 810                     "expected %zd; dropping connection",
 811                     icl_pdu_data_segment_length(request), off);
 812                 ctl_set_data_phase_error(&io->scsiio);
 813                 cfiscsi_session_terminate(cs);
 814                 return (true);
 815         }
 816
 817         if (io->scsiio.ext_data_filled == cdw->cdw_r2t_end &&
 818             (bhsdo->bhsdo_flags & BHSDO_FLAGS_F) == 0) {
 819                 CFISCSI_SESSION_WARN(cs, "got the final packet without "
 820                     "the F flag; flags = 0x%x; dropping connection",
 821                     bhsdo->bhsdo_flags);
 822                 ctl_set_data_phase_error(&io->scsiio);
 823                 cfiscsi_session_terminate(cs);
 824                 return (true);
 825         }
 826
 827         if (io->scsiio.ext_data_filled != cdw->cdw_r2t_end &&
 828             (bhsdo->bhsdo_flags & BHSDO_FLAGS_F) != 0) {
 829                 if ((request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
 830                     ISCSI_BHS_OPCODE_SCSI_DATA_OUT) {
 831                         CFISCSI_SESSION_WARN(cs, "got the final packet, but the "
 832                             "transmitted size was %zd bytes instead of %d; "
 833                             "dropping connection",
 834                             (size_t)io->scsiio.ext_data_filled,
 835                             cdw->cdw_r2t_end);
 836                         ctl_set_data_phase_error(&io->scsiio);
 837                         cfiscsi_session_terminate(cs);
 838                         return (true);
 839                 } else {
 840                         /*
 841                          * For SCSI Command PDU, this just means we need to
 842                          * solicit more data by sending R2T.
 843                          */
 844                         return (false);
 845                 }
 846         }
 847
 848         if (io->scsiio.ext_data_filled == cdw->cdw_r2t_end) {
 849 #if 0
 850                 CFISCSI_SESSION_DEBUG(cs, "no longer expecting Data-Out with target "
 851                     "transfer tag 0x%x", cdw->cdw_target_transfer_tag);
 852 #endif
 853
 854                 return (true);
 855         }
 856
 857         return (false);
 858 }
 859
 860 static void
 861 cfiscsi_pdu_handle_data_out(struct icl_pdu *request)
 862 {
 863         struct iscsi_bhs_data_out *bhsdo;
 864         struct cfiscsi_session *cs;
 865         struct cfiscsi_data_wait *cdw = NULL;
 866         union ctl_io *io;
 867         bool done;
 868
 869         cs = PDU_SESSION(request);
 870         bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs;
 871
 872         CFISCSI_SESSION_LOCK(cs);
 873         TAILQ_FOREACH(cdw, &cs->cs_waiting_for_data_out, cdw_next) {
 874 #if 0
 875                 CFISCSI_SESSION_DEBUG(cs, "have ttt 0x%x, itt 0x%x; looking for "
 876                     "ttt 0x%x, itt 0x%x",
 877                     bhsdo->bhsdo_target_transfer_tag,
 878                     bhsdo->bhsdo_initiator_task_tag,
 879                     cdw->cdw_target_transfer_tag, cdw->cdw_initiator_task_tag));
 880 #endif
 881                 if (bhsdo->bhsdo_target_transfer_tag ==
 882                     cdw->cdw_target_transfer_tag)
 883                         break;
 884         }
 885         CFISCSI_SESSION_UNLOCK(cs);
 886         if (cdw == NULL) {
 887                 CFISCSI_SESSION_WARN(cs, "data transfer tag 0x%x, initiator task tag "
 888                     "0x%x, not found; dropping connection",
 889                     bhsdo->bhsdo_target_transfer_tag, bhsdo->bhsdo_initiator_task_tag);
 890                 icl_pdu_free(request);
 891                 cfiscsi_session_terminate(cs);
 892                 return;
 893         }
 894
 895         if (cdw->cdw_datasn != ntohl(bhsdo->bhsdo_datasn)) {
 896                 CFISCSI_SESSION_WARN(cs, "received Data-Out PDU with "
 897                     "DataSN %u, while expected %u; dropping connection",
 898                     ntohl(bhsdo->bhsdo_datasn), cdw->cdw_datasn);
 899                 icl_pdu_free(request);
 900                 cfiscsi_session_terminate(cs);
 901                 return;
 902         }
 903         cdw->cdw_datasn++;
 904
 905         io = cdw->cdw_ctl_io;
 906         KASSERT((io->io_hdr.flags & CTL_FLAG_DATA_MASK) != CTL_FLAG_DATA_IN,
 907             ("CTL_FLAG_DATA_IN"));
 908
 909         done = cfiscsi_handle_data_segment(request, cdw);
 910         if (done) {
 911                 CFISCSI_SESSION_LOCK(cs);
 912                 TAILQ_REMOVE(&cs->cs_waiting_for_data_out, cdw, cdw_next);
 913                 CFISCSI_SESSION_UNLOCK(cs);
 914                 done = (io->scsiio.ext_data_filled != cdw->cdw_r2t_end ||
 915                     io->scsiio.ext_data_filled == io->scsiio.kern_data_len);
 916                 cfiscsi_data_wait_free(cs, cdw);
 917                 io->io_hdr.flags &= ~CTL_FLAG_DMA_INPROG;
 918                 if (done)
 919                         io->scsiio.be_move_done(io);
 920                 else
 921                         cfiscsi_datamove_out(io);
 922         }
 923
 924         icl_pdu_free(request);
 925 }
 926
 927 static void
 928 cfiscsi_pdu_handle_logout_request(struct icl_pdu *request)
 929 {
 930         struct iscsi_bhs_logout_request *bhslr;
 931         struct iscsi_bhs_logout_response *bhslr2;
 932         struct icl_pdu *response;
 933         struct cfiscsi_session *cs;
 934
 935         cs = PDU_SESSION(request);
 936         bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs;
 937         switch (bhslr->bhslr_reason & 0x7f) {
 938         case BHSLR_REASON_CLOSE_SESSION:
 939         case BHSLR_REASON_CLOSE_CONNECTION:
 940                 response = cfiscsi_pdu_new_response(request, M_NOWAIT);
 941                 if (response == NULL) {
 942                         CFISCSI_SESSION_DEBUG(cs, "failed to allocate memory");
 943                         icl_pdu_free(request);
 944                         cfiscsi_session_terminate(cs);
 945                         return;
 946                 }
 947                 bhslr2 = (struct iscsi_bhs_logout_response *)response->ip_bhs;
 948                 bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
 949                 bhslr2->bhslr_flags = 0x80;
 950                 bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY;
 951                 bhslr2->bhslr_initiator_task_tag =
 952                     bhslr->bhslr_initiator_task_tag;
 953                 icl_pdu_free(request);
 954                 cfiscsi_pdu_queue(response);
 955                 cfiscsi_session_terminate(cs);
 956                 break;
 957         case BHSLR_REASON_REMOVE_FOR_RECOVERY:
 958                 response = cfiscsi_pdu_new_response(request, M_NOWAIT);
 959                 if (response == NULL) {
 960                         CFISCSI_SESSION_WARN(cs,
 961                             "failed to allocate memory; dropping connection");
 962                         icl_pdu_free(request);
 963                         cfiscsi_session_terminate(cs);
 964                         return;
 965                 }
 966                 bhslr2 = (struct iscsi_bhs_logout_response *)response->ip_bhs;
 967                 bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE;
 968                 bhslr2->bhslr_flags = 0x80;
 969                 bhslr2->bhslr_response = BHSLR_RESPONSE_RECOVERY_NOT_SUPPORTED;
 970                 bhslr2->bhslr_initiator_task_tag =
 971                     bhslr->bhslr_initiator_task_tag;
 972                 icl_pdu_free(request);
 973                 cfiscsi_pdu_queue(response);
 974                 break;
 975         default:
 976                 CFISCSI_SESSION_WARN(cs, "invalid reason 0%x; dropping connection",
 977                     bhslr->bhslr_reason);
 978                 icl_pdu_free(request);
 979                 cfiscsi_session_terminate(cs);
 980                 break;
 981         }
 982 }
 983
 984 static void
 985 cfiscsi_callout(void *context)
 986 {
 987         struct icl_pdu *cp;
 988         struct iscsi_bhs_nop_in *bhsni;
 989         struct cfiscsi_session *cs;
 990
 991         cs = context;
 992
 993         if (cs->cs_terminating)
 994                 return;
 995
 996         callout_schedule(&cs->cs_callout, 1 * hz);
 997
 998         atomic_add_int(&cs->cs_timeout, 1);
 999
1000 #ifdef ICL_KERNEL_PROXY
1001         if (cs->cs_waiting_for_ctld || cs->cs_login_phase) {
1002                 if (login_timeout > 0 && cs->cs_timeout > login_timeout) {
1003                         CFISCSI_SESSION_WARN(cs, "login timed out after "
1004                             "%d seconds; dropping connection", cs->cs_timeout);
1005                         cfiscsi_session_terminate(cs);
1006                 }
1007                 return;
1008         }
1009 #endif
1010
1011         if (ping_timeout <= 0) {
1012                 /*
1013                  * Pings are disabled.  Don't send NOP-In in this case;
1014                  * user might have disabled pings to work around problems
1015                  * with certain initiators that can't properly handle
1016                  * NOP-In, such as iPXE.  Reset the timeout, to avoid
1017                  * triggering reconnection, should the user decide to
1018                  * reenable them.
1019                  */
1020                 cs->cs_timeout = 0;
1021                 return;
1022         }
1023
1024         if (cs->cs_timeout >= ping_timeout) {
1025                 CFISCSI_SESSION_WARN(cs, "no ping reply (NOP-Out) after %d seconds; "
1026                     "dropping connection",  ping_timeout);
1027                 cfiscsi_session_terminate(cs);
1028                 return;
1029         }
1030
1031         /*
1032          * If the ping was reset less than one second ago - which means
1033          * that we've received some PDU during the last second - assume
1034          * the traffic flows correctly and don't bother sending a NOP-Out.
1035          *
1036          * (It's 2 - one for one second, and one for incrementing is_timeout
1037          * earlier in this routine.)
1038          */
1039         if (cs->cs_timeout < 2)
1040                 return;
1041
1042         cp = icl_pdu_new(cs->cs_conn, M_NOWAIT);
1043         if (cp == NULL) {
1044                 CFISCSI_SESSION_WARN(cs, "failed to allocate memory");
1045                 return;
1046         }
1047         bhsni = (struct iscsi_bhs_nop_in *)cp->ip_bhs;
1048         bhsni->bhsni_opcode = ISCSI_BHS_OPCODE_NOP_IN;
1049         bhsni->bhsni_flags = 0x80;
1050         bhsni->bhsni_initiator_task_tag = 0xffffffff;
1051
1052         cfiscsi_pdu_queue(cp);
1053 }
1054
1055 static struct cfiscsi_data_wait *
1056 cfiscsi_data_wait_new(struct cfiscsi_session *cs, union ctl_io *io,
1057     uint32_t initiator_task_tag, uint32_t *target_transfer_tagp)
1058 {
1059         struct cfiscsi_data_wait *cdw;
1060         int error;
1061
1062         cdw = uma_zalloc(cfiscsi_data_wait_zone, M_NOWAIT | M_ZERO);
1063         if (cdw == NULL) {
1064                 CFISCSI_SESSION_WARN(cs,
1065                     "failed to allocate %zd bytes", sizeof(*cdw));
1066                 return (NULL);
1067         }
1068
1069         error = icl_conn_transfer_setup(cs->cs_conn, io, target_transfer_tagp,
1070             &cdw->cdw_icl_prv);
1071         if (error != 0) {
1072                 CFISCSI_SESSION_WARN(cs,
1073                     "icl_conn_transfer_setup() failed with error %d", error);
1074                 uma_zfree(cfiscsi_data_wait_zone, cdw);
1075                 return (NULL);
1076         }
1077
1078         cdw->cdw_ctl_io = io;
1079         cdw->cdw_target_transfer_tag = *target_transfer_tagp;
1080         cdw->cdw_initiator_task_tag = initiator_task_tag;
1081
1082         return (cdw);
1083 }
1084
1085 static void
1086 cfiscsi_data_wait_free(struct cfiscsi_session *cs,
1087     struct cfiscsi_data_wait *cdw)
1088 {
1089
1090         icl_conn_transfer_done(cs->cs_conn, cdw->cdw_icl_prv);
1091         uma_zfree(cfiscsi_data_wait_zone, cdw);
1092 }
1093
1094 static void
1095 cfiscsi_session_terminate_tasks(struct cfiscsi_session *cs)
1096 {
1097         struct cfiscsi_data_wait *cdw;
1098         union ctl_io *io;
1099         int error, last, wait;
1100
1101         if (cs->cs_target == NULL)
1102                 return;         /* No target yet, so nothing to do. */
1103         io = ctl_alloc_io(cs->cs_target->ct_port.ctl_pool_ref);
1104         ctl_zero_io(io);
1105         io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = cs;
1106         io->io_hdr.io_type = CTL_IO_TASK;
1107         io->io_hdr.nexus.initid = cs->cs_ctl_initid;
1108         io->io_hdr.nexus.targ_port = cs->cs_target->ct_port.targ_port;
1109         io->io_hdr.nexus.targ_lun = 0;
1110         io->taskio.tag_type = CTL_TAG_SIMPLE; /* XXX */
1111         io->taskio.task_action = CTL_TASK_I_T_NEXUS_RESET;
1112         wait = cs->cs_outstanding_ctl_pdus;
1113         refcount_acquire(&cs->cs_outstanding_ctl_pdus);
1114         error = ctl_queue(io);
1115         if (error != CTL_RETVAL_COMPLETE) {
1116                 CFISCSI_SESSION_WARN(cs, "ctl_queue() failed; error %d", error);
1117                 refcount_release(&cs->cs_outstanding_ctl_pdus);
1118                 ctl_free_io(io);
1119         }
1120
1121         CFISCSI_SESSION_LOCK(cs);
1122         while ((cdw = TAILQ_FIRST(&cs->cs_waiting_for_data_out)) != NULL) {
1123                 TAILQ_REMOVE(&cs->cs_waiting_for_data_out, cdw, cdw_next);
1124                 CFISCSI_SESSION_UNLOCK(cs);
1125                 /*
1126                  * Set nonzero port status; this prevents backends from
1127                  * assuming that the data transfer actually succeeded
1128                  * and writing uninitialized data to disk.
1129                  */
1130                 cdw->cdw_ctl_io->io_hdr.flags &= ~CTL_FLAG_DMA_INPROG;
1131                 cdw->cdw_ctl_io->scsiio.io_hdr.port_status = 42;
1132                 cdw->cdw_ctl_io->scsiio.be_move_done(cdw->cdw_ctl_io);
1133                 cfiscsi_data_wait_free(cs, cdw);
1134                 CFISCSI_SESSION_LOCK(cs);
1135         }
1136         CFISCSI_SESSION_UNLOCK(cs);
1137
1138         /*
1139          * Wait for CTL to terminate all the tasks.
1140          */
1141         if (wait > 0)
1142                 CFISCSI_SESSION_WARN(cs,
1143                     "waiting for CTL to terminate %d tasks", wait);
1144         for (;;) {
1145                 refcount_acquire(&cs->cs_outstanding_ctl_pdus);
1146                 last = refcount_release(&cs->cs_outstanding_ctl_pdus);
1147                 if (last != 0)
1148                         break;
1149                 tsleep(__DEVOLATILE(void *, &cs->cs_outstanding_ctl_pdus),
1150                     0, "cfiscsi_terminate", hz / 100);
1151         }
1152         if (wait > 0)
1153                 CFISCSI_SESSION_WARN(cs, "tasks terminated");
1154 }
1155
1156 static void
1157 cfiscsi_maintenance_thread(void *arg)
1158 {
1159         struct cfiscsi_session *cs;
1160
1161         cs = arg;
1162
1163         for (;;) {
1164                 CFISCSI_SESSION_LOCK(cs);
1165                 if (cs->cs_terminating == false)
1166                         cv_wait(&cs->cs_maintenance_cv, &cs->cs_lock);
1167                 CFISCSI_SESSION_UNLOCK(cs);
1168
1169                 if (cs->cs_terminating) {
1170
1171                         /*
1172                          * We used to wait up to 30 seconds to deliver queued
1173                          * PDUs to the initiator.  We also tried hard to deliver
1174                          * SCSI Responses for the aborted PDUs.  We don't do
1175                          * that anymore.  We might need to revisit that.
1176                          */
1177                         callout_drain(&cs->cs_callout);
1178                         icl_conn_close(cs->cs_conn);
1179
1180                         /*
1181                          * At this point ICL receive thread is no longer
1182                          * running; no new tasks can be queued.
1183                          */
1184                         cfiscsi_session_terminate_tasks(cs);
1185                         cfiscsi_session_delete(cs);
1186                         kthread_exit();
1187                         return;
1188                 }
1189                 CFISCSI_SESSION_DEBUG(cs, "nothing to do");
1190         }
1191 }
1192
1193 static void
1194 cfiscsi_session_terminate(struct cfiscsi_session *cs)
1195 {
1196
1197         if (cs->cs_terminating)
1198                 return;
1199         cs->cs_terminating = true;
1200         cv_signal(&cs->cs_maintenance_cv);
1201 #ifdef ICL_KERNEL_PROXY
1202         cv_signal(&cs->cs_login_cv);
1203 #endif
1204 }
1205
1206 static int
1207 cfiscsi_session_register_initiator(struct cfiscsi_session *cs)
1208 {
1209         struct cfiscsi_target *ct;
1210         char *name;
1211         int i;
1212
1213         KASSERT(cs->cs_ctl_initid == -1, ("already registered"));
1214
1215         ct = cs->cs_target;
1216         name = strdup(cs->cs_initiator_id, M_CTL);
1217         i = ctl_add_initiator(&ct->ct_port, -1, 0, name);
1218         if (i < 0) {
1219                 CFISCSI_SESSION_WARN(cs, "ctl_add_initiator failed with error %d",
1220                     i);
1221                 cs->cs_ctl_initid = -1;
1222                 return (1);
1223         }
1224         cs->cs_ctl_initid = i;
1225 #if 0
1226         CFISCSI_SESSION_DEBUG(cs, "added initiator id %d", i);
1227 #endif
1228
1229         return (0);
1230 }
1231
1232 static void
1233 cfiscsi_session_unregister_initiator(struct cfiscsi_session *cs)
1234 {
1235         int error;
1236
1237         if (cs->cs_ctl_initid == -1)
1238                 return;
1239
1240         error = ctl_remove_initiator(&cs->cs_target->ct_port, cs->cs_ctl_initid);
1241         if (error != 0) {
1242                 CFISCSI_SESSION_WARN(cs, "ctl_remove_initiator failed with error %d",
1243                     error);
1244         }
1245         cs->cs_ctl_initid = -1;
1246 }
1247
1248 static struct cfiscsi_session *
1249 cfiscsi_session_new(struct cfiscsi_softc *softc, const char *offload)
1250 {
1251         struct cfiscsi_session *cs;
1252         int error;
1253
1254         cs = malloc(sizeof(*cs), M_CFISCSI, M_NOWAIT | M_ZERO);
1255         if (cs == NULL) {
1256                 CFISCSI_WARN("malloc failed");
1257                 return (NULL);
1258         }
1259         cs->cs_ctl_initid = -1;
1260
1261         refcount_init(&cs->cs_outstanding_ctl_pdus, 0);
1262         TAILQ_INIT(&cs->cs_waiting_for_data_out);
1263         mtx_init(&cs->cs_lock, "cfiscsi_lock", NULL, MTX_DEF);
1264         cv_init(&cs->cs_maintenance_cv, "cfiscsi_mt");
1265 #ifdef ICL_KERNEL_PROXY
1266         cv_init(&cs->cs_login_cv, "cfiscsi_login");
1267 #endif
1268
1269         cs->cs_conn = icl_new_conn(offload, false, "cfiscsi", &cs->cs_lock);
1270         if (cs->cs_conn == NULL) {
1271                 free(cs, M_CFISCSI);
1272                 return (NULL);
1273         }
1274         cs->cs_conn->ic_receive = cfiscsi_receive_callback;
1275         cs->cs_conn->ic_error = cfiscsi_error_callback;
1276         cs->cs_conn->ic_prv0 = cs;
1277
1278         error = kthread_add(cfiscsi_maintenance_thread, cs, NULL, NULL, 0, 0, "cfiscsimt");
1279         if (error != 0) {
1280                 CFISCSI_SESSION_WARN(cs, "kthread_add(9) failed with error %d", error);
1281                 free(cs, M_CFISCSI);
1282                 return (NULL);
1283         }
1284
1285         mtx_lock(&softc->lock);
1286         cs->cs_id = ++softc->last_session_id;
1287         TAILQ_INSERT_TAIL(&softc->sessions, cs, cs_next);
1288         mtx_unlock(&softc->lock);
1289
1290         /*
1291          * Start pinging the initiator.
1292          */
1293         callout_init(&cs->cs_callout, 1);
1294         callout_reset(&cs->cs_callout, 1 * hz, cfiscsi_callout, cs);
1295
1296         return (cs);
1297 }
1298
1299 static void
1300 cfiscsi_session_delete(struct cfiscsi_session *cs)
1301 {
1302         struct cfiscsi_softc *softc;
1303
1304         softc = &cfiscsi_softc;
1305
1306         KASSERT(cs->cs_outstanding_ctl_pdus == 0,
1307             ("destroying session with outstanding CTL pdus"));
1308         KASSERT(TAILQ_EMPTY(&cs->cs_waiting_for_data_out),
1309             ("destroying session with non-empty queue"));
1310
1311         mtx_lock(&softc->lock);
1312         TAILQ_REMOVE(&softc->sessions, cs, cs_next);
1313         mtx_unlock(&softc->lock);
1314
1315         cfiscsi_session_unregister_initiator(cs);
1316         if (cs->cs_target != NULL)
1317                 cfiscsi_target_release(cs->cs_target);
1318         icl_conn_close(cs->cs_conn);
1319         icl_conn_free(cs->cs_conn);
1320         free(cs, M_CFISCSI);
1321         cv_signal(&softc->sessions_cv);
1322 }
1323
1324 static int
1325 cfiscsi_init(void)
1326 {
1327         struct cfiscsi_softc *softc;
1328
1329         softc = &cfiscsi_softc;
1330         bzero(softc, sizeof(*softc));
1331         mtx_init(&softc->lock, "cfiscsi", NULL, MTX_DEF);
1332
1333         cv_init(&softc->sessions_cv, "cfiscsi_sessions");
1334 #ifdef ICL_KERNEL_PROXY
1335         cv_init(&softc->accept_cv, "cfiscsi_accept");
1336 #endif
1337         TAILQ_INIT(&softc->sessions);
1338         TAILQ_INIT(&softc->targets);
1339
1340         cfiscsi_data_wait_zone = uma_zcreate("cfiscsi_data_wait",
1341             sizeof(struct cfiscsi_data_wait), NULL, NULL, NULL, NULL,
1342             UMA_ALIGN_PTR, 0);
1343
1344         return (0);
1345 }
1346
1347 static int
1348 cfiscsi_shutdown(void)
1349 {
1350         struct cfiscsi_softc *softc = &cfiscsi_softc;
1351
1352         if (!TAILQ_EMPTY(&softc->sessions) || !TAILQ_EMPTY(&softc->targets))
1353                 return (EBUSY);
1354
1355         uma_zdestroy(cfiscsi_data_wait_zone);
1356 #ifdef ICL_KERNEL_PROXY
1357         cv_destroy(&softc->accept_cv);
1358 #endif
1359         cv_destroy(&softc->sessions_cv);
1360         mtx_destroy(&softc->lock);
1361         return (0);
1362 }
1363
1364 #ifdef ICL_KERNEL_PROXY
1365 static void
1366 cfiscsi_accept(struct socket *so, struct sockaddr *sa, int portal_id)
1367 {
1368         struct cfiscsi_session *cs;
1369
1370         cs = cfiscsi_session_new(&cfiscsi_softc, NULL);
1371         if (cs == NULL) {
1372                 CFISCSI_WARN("failed to create session");
1373                 return;
1374         }
1375
1376         icl_conn_handoff_sock(cs->cs_conn, so);
1377         cs->cs_initiator_sa = sa;
1378         cs->cs_portal_id = portal_id;
1379         cs->cs_waiting_for_ctld = true;
1380         cv_signal(&cfiscsi_softc.accept_cv);
1381 }
1382 #endif
1383
1384 static void
1385 cfiscsi_online(void *arg)
1386 {
1387         struct cfiscsi_softc *softc;
1388         struct cfiscsi_target *ct;
1389         int online;
1390
1391         ct = (struct cfiscsi_target *)arg;
1392         softc = ct->ct_softc;
1393
1394         mtx_lock(&softc->lock);
1395         if (ct->ct_online) {
1396                 mtx_unlock(&softc->lock);
1397                 return;
1398         }
1399         ct->ct_online = 1;
1400         online = softc->online++;
1401         mtx_unlock(&softc->lock);
1402         if (online > 0)
1403                 return;
1404
1405 #ifdef ICL_KERNEL_PROXY
1406         if (softc->listener != NULL)
1407                 icl_listen_free(softc->listener);
1408         softc->listener = icl_listen_new(cfiscsi_accept);
1409 #endif
1410 }
1411
1412 static void
1413 cfiscsi_offline(void *arg)
1414 {
1415         struct cfiscsi_softc *softc;
1416         struct cfiscsi_target *ct;
1417         struct cfiscsi_session *cs;
1418         int online;
1419
1420         ct = (struct cfiscsi_target *)arg;
1421         softc = ct->ct_softc;
1422
1423         mtx_lock(&softc->lock);
1424         if (!ct->ct_online) {
1425                 mtx_unlock(&softc->lock);
1426                 return;
1427         }
1428         ct->ct_online = 0;
1429         online = --softc->online;
1430
1431         TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
1432                 if (cs->cs_target == ct)
1433                         cfiscsi_session_terminate(cs);
1434         }
1435         do {
1436                 TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
1437                         if (cs->cs_target == ct)
1438                                 break;
1439                 }
1440                 if (cs != NULL)
1441                         cv_wait(&softc->sessions_cv, &softc->lock);
1442         } while (cs != NULL && ct->ct_online == 0);
1443         mtx_unlock(&softc->lock);
1444         if (online > 0)
1445                 return;
1446
1447 #ifdef ICL_KERNEL_PROXY
1448         icl_listen_free(softc->listener);
1449         softc->listener = NULL;
1450 #endif
1451 }
1452
1453 static int
1454 cfiscsi_info(void *arg, struct sbuf *sb)
1455 {
1456         struct cfiscsi_target *ct = (struct cfiscsi_target *)arg;
1457         int retval;
1458
1459         retval = sbuf_printf(sb, "\t<cfiscsi_state>%d</cfiscsi_state>\n",
1460             ct->ct_state);
1461         return (retval);
1462 }
1463
1464 static void
1465 cfiscsi_ioctl_handoff(struct ctl_iscsi *ci)
1466 {
1467         struct cfiscsi_softc *softc;
1468         struct cfiscsi_session *cs, *cs2;
1469         struct cfiscsi_target *ct;
1470         struct ctl_iscsi_handoff_params *cihp;
1471         int error;
1472
1473         cihp = (struct ctl_iscsi_handoff_params *)&(ci->data);
1474         softc = &cfiscsi_softc;
1475
1476         CFISCSI_DEBUG("new connection from %s (%s) to %s",
1477             cihp->initiator_name, cihp->initiator_addr,
1478             cihp->target_name);
1479
1480         ct = cfiscsi_target_find(softc, cihp->target_name,
1481             cihp->portal_group_tag);
1482         if (ct == NULL) {
1483                 ci->status = CTL_ISCSI_ERROR;
1484                 snprintf(ci->error_str, sizeof(ci->error_str),
1485                     "%s: target not found", __func__);
1486                 return;
1487         }
1488
1489 #ifdef ICL_KERNEL_PROXY
1490         if (cihp->socket > 0 && cihp->connection_id > 0) {
1491                 snprintf(ci->error_str, sizeof(ci->error_str),
1492                     "both socket and connection_id set");
1493                 ci->status = CTL_ISCSI_ERROR;
1494                 cfiscsi_target_release(ct);
1495                 return;
1496         }
1497         if (cihp->socket == 0) {
1498                 mtx_lock(&cfiscsi_softc.lock);
1499                 TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
1500                         if (cs->cs_id == cihp->connection_id)
1501                                 break;
1502                 }
1503                 if (cs == NULL) {
1504                         mtx_unlock(&cfiscsi_softc.lock);
1505                         snprintf(ci->error_str, sizeof(ci->error_str),
1506                             "connection not found");
1507                         ci->status = CTL_ISCSI_ERROR;
1508                         cfiscsi_target_release(ct);
1509                         return;
1510                 }
1511                 mtx_unlock(&cfiscsi_softc.lock);
1512         } else {
1513 #endif
1514                 cs = cfiscsi_session_new(softc, cihp->offload);
1515                 if (cs == NULL) {
1516                         ci->status = CTL_ISCSI_ERROR;
1517                         snprintf(ci->error_str, sizeof(ci->error_str),
1518                             "%s: cfiscsi_session_new failed", __func__);
1519                         cfiscsi_target_release(ct);
1520                         return;
1521                 }
1522 #ifdef ICL_KERNEL_PROXY
1523         }
1524 #endif
1525
1526         /*
1527          * First PDU of Full Feature phase has the same CmdSN as the last
1528          * PDU from the Login Phase received from the initiator.  Thus,
1529          * the -1 below.
1530          */
1531         cs->cs_cmdsn = cihp->cmdsn;
1532         cs->cs_statsn = cihp->statsn;
1533         cs->cs_max_recv_data_segment_length = cihp->max_recv_data_segment_length;
1534         cs->cs_max_send_data_segment_length = cihp->max_send_data_segment_length;
1535         cs->cs_max_burst_length = cihp->max_burst_length;
1536         cs->cs_first_burst_length = cihp->first_burst_length;
1537         cs->cs_immediate_data = !!cihp->immediate_data;
1538         if (cihp->header_digest == CTL_ISCSI_DIGEST_CRC32C)
1539                 cs->cs_conn->ic_header_crc32c = true;
1540         if (cihp->data_digest == CTL_ISCSI_DIGEST_CRC32C)
1541                 cs->cs_conn->ic_data_crc32c = true;
1542
1543         strlcpy(cs->cs_initiator_name,
1544             cihp->initiator_name, sizeof(cs->cs_initiator_name));
1545         strlcpy(cs->cs_initiator_addr,
1546             cihp->initiator_addr, sizeof(cs->cs_initiator_addr));
1547         strlcpy(cs->cs_initiator_alias,
1548             cihp->initiator_alias, sizeof(cs->cs_initiator_alias));
1549         memcpy(cs->cs_initiator_isid,
1550             cihp->initiator_isid, sizeof(cs->cs_initiator_isid));
1551         snprintf(cs->cs_initiator_id, sizeof(cs->cs_initiator_id),
1552             "%s,i,0x%02x%02x%02x%02x%02x%02x", cs->cs_initiator_name,
1553             cihp->initiator_isid[0], cihp->initiator_isid[1],
1554             cihp->initiator_isid[2], cihp->initiator_isid[3],
1555             cihp->initiator_isid[4], cihp->initiator_isid[5]);
1556
1557         mtx_lock(&softc->lock);
1558         if (ct->ct_online == 0) {
1559                 mtx_unlock(&softc->lock);
1560                 cfiscsi_session_terminate(cs);
1561                 cfiscsi_target_release(ct);
1562                 ci->status = CTL_ISCSI_ERROR;
1563                 snprintf(ci->error_str, sizeof(ci->error_str),
1564                     "%s: port offline", __func__);
1565                 return;
1566         }
1567         cs->cs_target = ct;
1568         mtx_unlock(&softc->lock);
1569
1570         refcount_acquire(&cs->cs_outstanding_ctl_pdus);
1571 restart:
1572         if (!cs->cs_terminating) {
1573                 mtx_lock(&softc->lock);
1574                 TAILQ_FOREACH(cs2, &softc->sessions, cs_next) {
1575                         if (cs2 != cs && cs2->cs_tasks_aborted == false &&
1576                             cs->cs_target == cs2->cs_target &&
1577                             strcmp(cs->cs_initiator_id, cs2->cs_initiator_id) == 0) {
1578                                 if (strcmp(cs->cs_initiator_addr,
1579                                     cs2->cs_initiator_addr) != 0) {
1580                                         CFISCSI_SESSION_WARN(cs2,
1581                                             "session reinstatement from "
1582                                             "different address %s",
1583                                             cs->cs_initiator_addr);
1584                                 } else {
1585                                         CFISCSI_SESSION_DEBUG(cs2,
1586                                             "session reinstatement");
1587                                 }
1588                                 cfiscsi_session_terminate(cs2);
1589                                 mtx_unlock(&softc->lock);
1590                                 pause("cfiscsi_reinstate", 1);
1591                                 goto restart;
1592                         }
1593                 }
1594                 mtx_unlock(&softc->lock);
1595         }
1596
1597         /*
1598          * Register initiator with CTL.
1599          */
1600         cfiscsi_session_register_initiator(cs);
1601
1602 #ifdef ICL_KERNEL_PROXY
1603         if (cihp->socket > 0) {
1604 #endif
1605                 error = icl_conn_handoff(cs->cs_conn, cihp->socket);
1606                 if (error != 0) {
1607                         cfiscsi_session_terminate(cs);
1608                         refcount_release(&cs->cs_outstanding_ctl_pdus);
1609                         ci->status = CTL_ISCSI_ERROR;
1610                         snprintf(ci->error_str, sizeof(ci->error_str),
1611                             "%s: icl_conn_handoff failed with error %d",
1612                             __func__, error);
1613                         return;
1614                 }
1615 #ifdef ICL_KERNEL_PROXY
1616         }
1617 #endif
1618
1619 #ifdef ICL_KERNEL_PROXY
1620         cs->cs_login_phase = false;
1621
1622         /*
1623          * First PDU of the Full Feature phase has likely already arrived.
1624          * We have to pick it up and execute properly.
1625          */
1626         if (cs->cs_login_pdu != NULL) {
1627                 CFISCSI_SESSION_DEBUG(cs, "picking up first PDU");
1628                 cfiscsi_pdu_handle(cs->cs_login_pdu);
1629                 cs->cs_login_pdu = NULL;
1630         }
1631 #endif
1632
1633         refcount_release(&cs->cs_outstanding_ctl_pdus);
1634         ci->status = CTL_ISCSI_OK;
1635 }
1636
1637 static void
1638 cfiscsi_ioctl_list(struct ctl_iscsi *ci)
1639 {
1640         struct ctl_iscsi_list_params *cilp;
1641         struct cfiscsi_session *cs;
1642         struct cfiscsi_softc *softc;
1643         struct sbuf *sb;
1644         int error;
1645
1646         cilp = (struct ctl_iscsi_list_params *)&(ci->data);
1647         softc = &cfiscsi_softc;
1648
1649         sb = sbuf_new(NULL, NULL, cilp->alloc_len, SBUF_FIXEDLEN);
1650         if (sb == NULL) {
1651                 ci->status = CTL_ISCSI_ERROR;
1652                 snprintf(ci->error_str, sizeof(ci->error_str),
1653                     "Unable to allocate %d bytes for iSCSI session list",
1654                     cilp->alloc_len);
1655                 return;
1656         }
1657
1658         sbuf_printf(sb, "<ctlislist>\n");
1659         mtx_lock(&softc->lock);
1660         TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
1661 #ifdef ICL_KERNEL_PROXY
1662                 if (cs->cs_target == NULL)
1663                         continue;
1664 #endif
1665                 error = sbuf_printf(sb, "<connection id=\"%d\">"
1666                     "<initiator>%s</initiator>"
1667                     "<initiator_addr>%s</initiator_addr>"
1668                     "<initiator_alias>%s</initiator_alias>"
1669                     "<target>%s</target>"
1670                     "<target_alias>%s</target_alias>"
1671                     "<target_portal_group_tag>%u</target_portal_group_tag>"
1672                     "<header_digest>%s</header_digest>"
1673                     "<data_digest>%s</data_digest>"
1674                     "<max_recv_data_segment_length>%d</max_recv_data_segment_length>"
1675                     "<max_send_data_segment_length>%d</max_send_data_segment_length>"
1676                     "<max_burst_length>%d</max_burst_length>"
1677                     "<first_burst_length>%d</first_burst_length>"
1678                     "<immediate_data>%d</immediate_data>"
1679                     "<iser>%d</iser>"
1680                     "<offload>%s</offload>"
1681                     "</connection>\n",
1682                     cs->cs_id,
1683                     cs->cs_initiator_name, cs->cs_initiator_addr, cs->cs_initiator_alias,
1684                     cs->cs_target->ct_name, cs->cs_target->ct_alias,
1685                     cs->cs_target->ct_tag,
1686                     cs->cs_conn->ic_header_crc32c ? "CRC32C" : "None",
1687                     cs->cs_conn->ic_data_crc32c ? "CRC32C" : "None",
1688                     cs->cs_max_recv_data_segment_length,
1689                     cs->cs_max_send_data_segment_length,
1690                     cs->cs_max_burst_length,
1691                     cs->cs_first_burst_length,
1692                     cs->cs_immediate_data,
1693                     cs->cs_conn->ic_iser,
1694                     cs->cs_conn->ic_offload);
1695                 if (error != 0)
1696                         break;
1697         }
1698         mtx_unlock(&softc->lock);
1699         error = sbuf_printf(sb, "</ctlislist>\n");
1700         if (error != 0) {
1701                 sbuf_delete(sb);
1702                 ci->status = CTL_ISCSI_LIST_NEED_MORE_SPACE;
1703                 snprintf(ci->error_str, sizeof(ci->error_str),
1704                     "Out of space, %d bytes is too small", cilp->alloc_len);
1705                 return;
1706         }
1707         sbuf_finish(sb);
1708
1709         error = copyout(sbuf_data(sb), cilp->conn_xml, sbuf_len(sb) + 1);
1710         if (error != 0) {
1711                 sbuf_delete(sb);
1712                 snprintf(ci->error_str, sizeof(ci->error_str),
1713                     "copyout failed with error %d", error);
1714                 ci->status = CTL_ISCSI_ERROR;
1715                 return;
1716         }
1717         cilp->fill_len = sbuf_len(sb) + 1;
1718         ci->status = CTL_ISCSI_OK;
1719         sbuf_delete(sb);
1720 }
1721
1722 static void
1723 cfiscsi_ioctl_logout(struct ctl_iscsi *ci)
1724 {
1725         struct icl_pdu *response;
1726         struct iscsi_bhs_asynchronous_message *bhsam;
1727         struct ctl_iscsi_logout_params *cilp;
1728         struct cfiscsi_session *cs;
1729         struct cfiscsi_softc *softc;
1730         int found = 0;
1731
1732         cilp = (struct ctl_iscsi_logout_params *)&(ci->data);
1733         softc = &cfiscsi_softc;
1734
1735         mtx_lock(&softc->lock);
1736         TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
1737                 if (cilp->all == 0 && cs->cs_id != cilp->connection_id &&
1738                     strcmp(cs->cs_initiator_name, cilp->initiator_name) != 0 &&
1739                     strcmp(cs->cs_initiator_addr, cilp->initiator_addr) != 0)
1740                         continue;
1741
1742                 response = icl_pdu_new(cs->cs_conn, M_NOWAIT);
1743                 if (response == NULL) {
1744                         ci->status = CTL_ISCSI_ERROR;
1745                         snprintf(ci->error_str, sizeof(ci->error_str),
1746                             "Unable to allocate memory");
1747                         mtx_unlock(&softc->lock);
1748                         return;
1749                 }
1750                 bhsam =
1751                     (struct iscsi_bhs_asynchronous_message *)response->ip_bhs;
1752                 bhsam->bhsam_opcode = ISCSI_BHS_OPCODE_ASYNC_MESSAGE;
1753                 bhsam->bhsam_flags = 0x80;
1754                 bhsam->bhsam_async_event = BHSAM_EVENT_TARGET_REQUESTS_LOGOUT;
1755                 bhsam->bhsam_parameter3 = htons(10);
1756                 cfiscsi_pdu_queue(response);
1757                 found++;
1758         }
1759         mtx_unlock(&softc->lock);
1760
1761         if (found == 0) {
1762                 ci->status = CTL_ISCSI_SESSION_NOT_FOUND;
1763                 snprintf(ci->error_str, sizeof(ci->error_str),
1764                     "No matching connections found");
1765                 return;
1766         }
1767
1768         ci->status = CTL_ISCSI_OK;
1769 }
1770
1771 static void
1772 cfiscsi_ioctl_terminate(struct ctl_iscsi *ci)
1773 {
1774         struct icl_pdu *response;
1775         struct iscsi_bhs_asynchronous_message *bhsam;
1776         struct ctl_iscsi_terminate_params *citp;
1777         struct cfiscsi_session *cs;
1778         struct cfiscsi_softc *softc;
1779         int found = 0;
1780
1781         citp = (struct ctl_iscsi_terminate_params *)&(ci->data);
1782         softc = &cfiscsi_softc;
1783
1784         mtx_lock(&softc->lock);
1785         TAILQ_FOREACH(cs, &softc->sessions, cs_next) {
1786                 if (citp->all == 0 && cs->cs_id != citp->connection_id &&
1787                     strcmp(cs->cs_initiator_name, citp->initiator_name) != 0 &&
1788                     strcmp(cs->cs_initiator_addr, citp->initiator_addr) != 0)
1789                         continue;
1790
1791                 response = icl_pdu_new(cs->cs_conn, M_NOWAIT);
1792                 if (response == NULL) {
1793                         /*
1794                          * Oh well.  Just terminate the connection.
1795                          */
1796                 } else {
1797                         bhsam = (struct iscsi_bhs_asynchronous_message *)
1798                             response->ip_bhs;
1799                         bhsam->bhsam_opcode = ISCSI_BHS_OPCODE_ASYNC_MESSAGE;
1800                         bhsam->bhsam_flags = 0x80;
1801                         bhsam->bhsam_0xffffffff = 0xffffffff;
1802                         bhsam->bhsam_async_event =
1803                             BHSAM_EVENT_TARGET_TERMINATES_SESSION;
1804                         cfiscsi_pdu_queue(response);
1805                 }
1806                 cfiscsi_session_terminate(cs);
1807                 found++;
1808         }
1809         mtx_unlock(&softc->lock);
1810
1811         if (found == 0) {
1812                 ci->status = CTL_ISCSI_SESSION_NOT_FOUND;
1813                 snprintf(ci->error_str, sizeof(ci->error_str),
1814                     "No matching connections found");
1815                 return;
1816         }
1817
1818         ci->status = CTL_ISCSI_OK;
1819 }
1820
1821 static void
1822 cfiscsi_ioctl_limits(struct ctl_iscsi *ci)
1823 {
1824         struct ctl_iscsi_limits_params *cilp;
1825         struct icl_drv_limits idl;
1826         int error;
1827
1828         cilp = (struct ctl_iscsi_limits_params *)&(ci->data);
1829
1830         error = icl_limits(cilp->offload, false, &idl);
1831         if (error != 0) {
1832                 ci->status = CTL_ISCSI_ERROR;
1833                 snprintf(ci->error_str, sizeof(ci->error_str),
1834                         "%s: icl_limits failed with error %d",
1835                         __func__, error);
1836                 return;
1837         }
1838
1839         cilp->max_recv_data_segment_length =
1840             idl.idl_max_recv_data_segment_length;
1841         cilp->max_send_data_segment_length =
1842             idl.idl_max_send_data_segment_length;
1843         cilp->max_burst_length = idl.idl_max_burst_length;
1844         cilp->first_burst_length = idl.idl_first_burst_length;
1845
1846         ci->status = CTL_ISCSI_OK;
1847 }
1848
1849 #ifdef ICL_KERNEL_PROXY
1850 static void
1851 cfiscsi_ioctl_listen(struct ctl_iscsi *ci)
1852 {
1853         struct ctl_iscsi_listen_params *cilp;
1854         struct sockaddr *sa;
1855         int error;
1856
1857         cilp = (struct ctl_iscsi_listen_params *)&(ci->data);
1858
1859         if (cfiscsi_softc.listener == NULL) {
1860                 CFISCSI_DEBUG("no listener");
1861                 snprintf(ci->error_str, sizeof(ci->error_str), "no listener");
1862                 ci->status = CTL_ISCSI_ERROR;
1863                 return;
1864         }
1865
1866         error = getsockaddr(&sa, (void *)cilp->addr, cilp->addrlen);
1867         if (error != 0) {
1868                 CFISCSI_DEBUG("getsockaddr, error %d", error);
1869                 snprintf(ci->error_str, sizeof(ci->error_str), "getsockaddr failed");
1870                 ci->status = CTL_ISCSI_ERROR;
1871                 return;
1872         }
1873
1874         error = icl_listen_add(cfiscsi_softc.listener, cilp->iser, cilp->domain,
1875             cilp->socktype, cilp->protocol, sa, cilp->portal_id);
1876         if (error != 0) {
1877                 free(sa, M_SONAME);
1878                 CFISCSI_DEBUG("icl_listen_add, error %d", error);
1879                 snprintf(ci->error_str, sizeof(ci->error_str),
1880                     "icl_listen_add failed, error %d", error);
1881                 ci->status = CTL_ISCSI_ERROR;
1882                 return;
1883         }
1884
1885         ci->status = CTL_ISCSI_OK;
1886 }
1887
1888 static void
1889 cfiscsi_ioctl_accept(struct ctl_iscsi *ci)
1890 {
1891         struct ctl_iscsi_accept_params *ciap;
1892         struct cfiscsi_session *cs;
1893         int error;
1894
1895         ciap = (struct ctl_iscsi_accept_params *)&(ci->data);
1896
1897         mtx_lock(&cfiscsi_softc.lock);
1898         for (;;) {
1899                 TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
1900                         if (cs->cs_waiting_for_ctld)
1901                                 break;
1902                 }
1903                 if (cs != NULL)
1904                         break;
1905                 error = cv_wait_sig(&cfiscsi_softc.accept_cv, &cfiscsi_softc.lock);
1906                 if (error != 0) {
1907                         mtx_unlock(&cfiscsi_softc.lock);
1908                         snprintf(ci->error_str, sizeof(ci->error_str), "interrupted");
1909                         ci->status = CTL_ISCSI_ERROR;
1910                         return;
1911                 }
1912         }
1913         mtx_unlock(&cfiscsi_softc.lock);
1914
1915         cs->cs_waiting_for_ctld = false;
1916         cs->cs_login_phase = true;
1917
1918         ciap->connection_id = cs->cs_id;
1919         ciap->portal_id = cs->cs_portal_id;
1920         ciap->initiator_addrlen = cs->cs_initiator_sa->sa_len;
1921         error = copyout(cs->cs_initiator_sa, ciap->initiator_addr,
1922             cs->cs_initiator_sa->sa_len);
1923         if (error != 0) {
1924                 snprintf(ci->error_str, sizeof(ci->error_str),
1925                     "copyout failed with error %d", error);
1926                 ci->status = CTL_ISCSI_ERROR;
1927                 return;
1928         }
1929
1930         ci->status = CTL_ISCSI_OK;
1931 }
1932
1933 static void
1934 cfiscsi_ioctl_send(struct ctl_iscsi *ci)
1935 {
1936         struct ctl_iscsi_send_params *cisp;
1937         struct cfiscsi_session *cs;
1938         struct icl_pdu *ip;
1939         size_t datalen;
1940         void *data;
1941         int error;
1942
1943         cisp = (struct ctl_iscsi_send_params *)&(ci->data);
1944
1945         mtx_lock(&cfiscsi_softc.lock);
1946         TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
1947                 if (cs->cs_id == cisp->connection_id)
1948                         break;
1949         }
1950         if (cs == NULL) {
1951                 mtx_unlock(&cfiscsi_softc.lock);
1952                 snprintf(ci->error_str, sizeof(ci->error_str), "connection not found");
1953                 ci->status = CTL_ISCSI_ERROR;
1954                 return;
1955         }
1956         mtx_unlock(&cfiscsi_softc.lock);
1957
1958 #if 0
1959         if (cs->cs_login_phase == false)
1960                 return (EBUSY);
1961 #endif
1962
1963         if (cs->cs_terminating) {
1964                 snprintf(ci->error_str, sizeof(ci->error_str), "connection is terminating");
1965                 ci->status = CTL_ISCSI_ERROR;
1966                 return;
1967         }
1968
1969         datalen = cisp->data_segment_len;
1970         /*
1971          * XXX
1972          */
1973         //if (datalen > CFISCSI_MAX_DATA_SEGMENT_LENGTH) {
1974         if (datalen > 65535) {
1975                 snprintf(ci->error_str, sizeof(ci->error_str), "data segment too big");
1976                 ci->status = CTL_ISCSI_ERROR;
1977                 return;
1978         }
1979         if (datalen > 0) {
1980                 data = malloc(datalen, M_CFISCSI, M_WAITOK);
1981                 error = copyin(cisp->data_segment, data, datalen);
1982                 if (error != 0) {
1983                         free(data, M_CFISCSI);
1984                         snprintf(ci->error_str, sizeof(ci->error_str), "copyin error %d", error);
1985                         ci->status = CTL_ISCSI_ERROR;
1986                         return;
1987                 }
1988         }
1989
1990         ip = icl_pdu_new(cs->cs_conn, M_WAITOK);
1991         memcpy(ip->ip_bhs, cisp->bhs, sizeof(*ip->ip_bhs));
1992         if (datalen > 0) {
1993                 icl_pdu_append_data(ip, data, datalen, M_WAITOK);
1994                 free(data, M_CFISCSI);
1995         }
1996         CFISCSI_SESSION_LOCK(cs);
1997         icl_pdu_queue(ip);
1998         CFISCSI_SESSION_UNLOCK(cs);
1999         ci->status = CTL_ISCSI_OK;
2000 }
2001
2002 static void
2003 cfiscsi_ioctl_receive(struct ctl_iscsi *ci)
2004 {
2005         struct ctl_iscsi_receive_params *cirp;
2006         struct cfiscsi_session *cs;
2007         struct icl_pdu *ip;
2008         void *data;
2009         int error;
2010
2011         cirp = (struct ctl_iscsi_receive_params *)&(ci->data);
2012
2013         mtx_lock(&cfiscsi_softc.lock);
2014         TAILQ_FOREACH(cs, &cfiscsi_softc.sessions, cs_next) {
2015                 if (cs->cs_id == cirp->connection_id)
2016                         break;
2017         }
2018         if (cs == NULL) {
2019                 mtx_unlock(&cfiscsi_softc.lock);
2020                 snprintf(ci->error_str, sizeof(ci->error_str),
2021                     "connection not found");
2022                 ci->status = CTL_ISCSI_ERROR;
2023                 return;
2024         }
2025         mtx_unlock(&cfiscsi_softc.lock);
2026
2027 #if 0
2028         if (is->is_login_phase == false)
2029                 return (EBUSY);
2030 #endif
2031
2032         CFISCSI_SESSION_LOCK(cs);
2033         while (cs->cs_login_pdu == NULL && cs->cs_terminating == false) {
2034                 error = cv_wait_sig(&cs->cs_login_cv, &cs->cs_lock);
2035                 if (error != 0) {
2036                         CFISCSI_SESSION_UNLOCK(cs);
2037                         snprintf(ci->error_str, sizeof(ci->error_str),
2038                             "interrupted by signal");
2039                         ci->status = CTL_ISCSI_ERROR;
2040                         return;
2041                 }
2042         }
2043
2044         if (cs->cs_terminating) {
2045                 CFISCSI_SESSION_UNLOCK(cs);
2046                 snprintf(ci->error_str, sizeof(ci->error_str),
2047                     "connection terminating");
2048                 ci->status = CTL_ISCSI_ERROR;
2049                 return;
2050         }
2051         ip = cs->cs_login_pdu;
2052         cs->cs_login_pdu = NULL;
2053         CFISCSI_SESSION_UNLOCK(cs);
2054
2055         if (ip->ip_data_len > cirp->data_segment_len) {
2056                 icl_pdu_free(ip);
2057                 snprintf(ci->error_str, sizeof(ci->error_str),
2058                     "data segment too big");
2059                 ci->status = CTL_ISCSI_ERROR;
2060                 return;
2061         }
2062
2063         copyout(ip->ip_bhs, cirp->bhs, sizeof(*ip->ip_bhs));
2064         if (ip->ip_data_len > 0) {
2065                 data = malloc(ip->ip_data_len, M_CFISCSI, M_WAITOK);
2066                 icl_pdu_get_data(ip, 0, data, ip->ip_data_len);
2067                 copyout(data, cirp->data_segment, ip->ip_data_len);
2068                 free(data, M_CFISCSI);
2069         }
2070
2071         icl_pdu_free(ip);
2072         ci->status = CTL_ISCSI_OK;
2073 }
2074
2075 #endif /* !ICL_KERNEL_PROXY */
2076
2077 static void
2078 cfiscsi_ioctl_port_create(struct ctl_req *req)
2079 {
2080         struct cfiscsi_target *ct;
2081         struct ctl_port *port;
2082         const char *target, *alias, *tags;
2083         struct scsi_vpd_id_descriptor *desc;
2084         ctl_options_t opts;
2085         int retval, len, idlen;
2086         uint16_t tag;
2087
2088         ctl_init_opts(&opts, req->num_args, req->kern_args);
2089         target = ctl_get_opt(&opts, "cfiscsi_target");
2090         alias = ctl_get_opt(&opts, "cfiscsi_target_alias");
2091         tags = ctl_get_opt(&opts, "cfiscsi_portal_group_tag");
2092         if (target == NULL || tags == NULL) {
2093                 req->status = CTL_LUN_ERROR;
2094                 snprintf(req->error_str, sizeof(req->error_str),
2095                     "Missing required argument");
2096                 ctl_free_opts(&opts);
2097                 return;
2098         }
2099         tag = strtol(tags, (char **)NULL, 10);
2100         ct = cfiscsi_target_find_or_create(&cfiscsi_softc, target, alias, tag);
2101         if (ct == NULL) {
2102                 req->status = CTL_LUN_ERROR;
2103                 snprintf(req->error_str, sizeof(req->error_str),
2104                     "failed to create target \"%s\"", target);
2105                 ctl_free_opts(&opts);
2106                 return;
2107         }
2108         if (ct->ct_state == CFISCSI_TARGET_STATE_ACTIVE) {
2109                 req->status = CTL_LUN_ERROR;
2110                 snprintf(req->error_str, sizeof(req->error_str),
2111                     "target \"%s\" for portal group tag %u already exists",
2112                     target, tag);
2113                 cfiscsi_target_release(ct);
2114                 ctl_free_opts(&opts);
2115                 return;
2116         }
2117         port = &ct->ct_port;
2118         // WAT
2119         if (ct->ct_state == CFISCSI_TARGET_STATE_DYING)
2120                 goto done;
2121
2122         port->frontend = &cfiscsi_frontend;
2123         port->port_type = CTL_PORT_ISCSI;
2124         /* XXX KDM what should the real number be here? */
2125         port->num_requested_ctl_io = 4096;
2126         port->port_name = "iscsi";
2127         port->physical_port = tag;
2128         port->virtual_port = ct->ct_target_id;
2129         port->port_online = cfiscsi_online;
2130         port->port_offline = cfiscsi_offline;
2131         port->port_info = cfiscsi_info;
2132         port->onoff_arg = ct;
2133         port->fe_datamove = cfiscsi_datamove;
2134         port->fe_done = cfiscsi_done;
2135         port->targ_port = -1;
2136
2137         port->options = opts;
2138         STAILQ_INIT(&opts);
2139
2140         /* Generate Port ID. */
2141         idlen = strlen(target) + strlen(",t,0x0001") + 1;
2142         idlen = roundup2(idlen, 4);
2143         len = sizeof(struct scsi_vpd_device_id) + idlen;
2144         port->port_devid = malloc(sizeof(struct ctl_devid) + len,
2145             M_CTL, M_WAITOK | M_ZERO);
2146         port->port_devid->len = len;
2147         desc = (struct scsi_vpd_id_descriptor *)port->port_devid->data;
2148         desc->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
2149         desc->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_PORT |
2150             SVPD_ID_TYPE_SCSI_NAME;
2151         desc->length = idlen;
2152         snprintf(desc->identifier, idlen, "%s,t,0x%4.4x", target, tag);
2153
2154         /* Generate Target ID. */
2155         idlen = strlen(target) + 1;
2156         idlen = roundup2(idlen, 4);
2157         len = sizeof(struct scsi_vpd_device_id) + idlen;
2158         port->target_devid = malloc(sizeof(struct ctl_devid) + len,
2159             M_CTL, M_WAITOK | M_ZERO);
2160         port->target_devid->len = len;
2161         desc = (struct scsi_vpd_id_descriptor *)port->target_devid->data;
2162         desc->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
2163         desc->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_TARGET |
2164             SVPD_ID_TYPE_SCSI_NAME;
2165         desc->length = idlen;
2166         strlcpy(desc->identifier, target, idlen);
2167
2168         retval = ctl_port_register(port);
2169         if (retval != 0) {
2170                 ctl_free_opts(&port->options);
2171                 free(port->port_devid, M_CFISCSI);
2172                 free(port->target_devid, M_CFISCSI);
2173                 cfiscsi_target_release(ct);
2174                 req->status = CTL_LUN_ERROR;
2175                 snprintf(req->error_str, sizeof(req->error_str),
2176                     "ctl_port_register() failed with error %d", retval);
2177                 return;
2178         }
2179 done:
2180         ct->ct_state = CFISCSI_TARGET_STATE_ACTIVE;
2181         req->status = CTL_LUN_OK;
2182         memcpy(req->kern_args[0].kvalue, &port->targ_port,
2183             sizeof(port->targ_port)); //XXX
2184 }
2185
2186 static void
2187 cfiscsi_ioctl_port_remove(struct ctl_req *req)
2188 {
2189         struct cfiscsi_target *ct;
2190         const char *target, *tags;
2191         ctl_options_t opts;
2192         uint16_t tag;
2193
2194         ctl_init_opts(&opts, req->num_args, req->kern_args);
2195         target = ctl_get_opt(&opts, "cfiscsi_target");
2196         tags = ctl_get_opt(&opts, "cfiscsi_portal_group_tag");
2197         if (target == NULL || tags == NULL) {
2198                 ctl_free_opts(&opts);
2199                 req->status = CTL_LUN_ERROR;
2200                 snprintf(req->error_str, sizeof(req->error_str),
2201                     "Missing required argument");
2202                 return;
2203         }
2204         tag = strtol(tags, (char **)NULL, 10);
2205         ct = cfiscsi_target_find(&cfiscsi_softc, target, tag);
2206         if (ct == NULL) {
2207                 ctl_free_opts(&opts);
2208                 req->status = CTL_LUN_ERROR;
2209                 snprintf(req->error_str, sizeof(req->error_str),
2210                     "can't find target \"%s\"", target);
2211                 return;
2212         }
2213         if (ct->ct_state != CFISCSI_TARGET_STATE_ACTIVE) {
2214                 ctl_free_opts(&opts);
2215                 req->status = CTL_LUN_ERROR;
2216                 snprintf(req->error_str, sizeof(req->error_str),
2217                     "target \"%s\" is already dying", target);
2218                 return;
2219         }
2220         ctl_free_opts(&opts);
2221
2222         ct->ct_state = CFISCSI_TARGET_STATE_DYING;
2223         ctl_port_offline(&ct->ct_port);
2224         cfiscsi_target_release(ct);
2225         cfiscsi_target_release(ct);
2226         req->status = CTL_LUN_OK;
2227 }
2228
2229 static int
2230 cfiscsi_ioctl(struct cdev *dev,
2231     u_long cmd, caddr_t addr, int flag, struct thread *td)
2232 {
2233         struct ctl_iscsi *ci;
2234         struct ctl_req *req;
2235
2236         if (cmd == CTL_PORT_REQ) {
2237                 req = (struct ctl_req *)addr;
2238                 switch (req->reqtype) {
2239                 case CTL_REQ_CREATE:
2240                         cfiscsi_ioctl_port_create(req);
2241                         break;
2242                 case CTL_REQ_REMOVE:
2243                         cfiscsi_ioctl_port_remove(req);
2244                         break;
2245                 default:
2246                         req->status = CTL_LUN_ERROR;
2247                         snprintf(req->error_str, sizeof(req->error_str),
2248                             "Unsupported request type %d", req->reqtype);
2249                 }
2250                 return (0);
2251         }
2252
2253         if (cmd != CTL_ISCSI)
2254                 return (ENOTTY);
2255
2256         ci = (struct ctl_iscsi *)addr;
2257         switch (ci->type) {
2258         case CTL_ISCSI_HANDOFF:
2259                 cfiscsi_ioctl_handoff(ci);
2260                 break;
2261         case CTL_ISCSI_LIST:
2262                 cfiscsi_ioctl_list(ci);
2263                 break;
2264         case CTL_ISCSI_LOGOUT:
2265                 cfiscsi_ioctl_logout(ci);
2266                 break;
2267         case CTL_ISCSI_TERMINATE:
2268                 cfiscsi_ioctl_terminate(ci);
2269                 break;
2270         case CTL_ISCSI_LIMITS:
2271                 cfiscsi_ioctl_limits(ci);
2272                 break;
2273 #ifdef ICL_KERNEL_PROXY
2274         case CTL_ISCSI_LISTEN:
2275                 cfiscsi_ioctl_listen(ci);
2276                 break;
2277         case CTL_ISCSI_ACCEPT:
2278                 cfiscsi_ioctl_accept(ci);
2279                 break;
2280         case CTL_ISCSI_SEND:
2281                 cfiscsi_ioctl_send(ci);
2282                 break;
2283         case CTL_ISCSI_RECEIVE:
2284                 cfiscsi_ioctl_receive(ci);
2285                 break;
2286 #else
2287         case CTL_ISCSI_LISTEN:
2288         case CTL_ISCSI_ACCEPT:
2289         case CTL_ISCSI_SEND:
2290         case CTL_ISCSI_RECEIVE:
2291                 ci->status = CTL_ISCSI_ERROR;
2292                 snprintf(ci->error_str, sizeof(ci->error_str),
2293                     "%s: CTL compiled without ICL_KERNEL_PROXY",
2294                     __func__);
2295                 break;
2296 #endif /* !ICL_KERNEL_PROXY */
2297         default:
2298                 ci->status = CTL_ISCSI_ERROR;
2299                 snprintf(ci->error_str, sizeof(ci->error_str),
2300                     "%s: invalid iSCSI request type %d", __func__, ci->type);
2301                 break;
2302         }
2303
2304         return (0);
2305 }
2306
2307 static void
2308 cfiscsi_target_hold(struct cfiscsi_target *ct)
2309 {
2310
2311         refcount_acquire(&ct->ct_refcount);
2312 }
2313
2314 static void
2315 cfiscsi_target_release(struct cfiscsi_target *ct)
2316 {
2317         struct cfiscsi_softc *softc;
2318
2319         softc = ct->ct_softc;
2320         mtx_lock(&softc->lock);
2321         if (refcount_release(&ct->ct_refcount)) {
2322                 TAILQ_REMOVE(&softc->targets, ct, ct_next);
2323                 mtx_unlock(&softc->lock);
2324                 if (ct->ct_state != CFISCSI_TARGET_STATE_INVALID) {
2325                         ct->ct_state = CFISCSI_TARGET_STATE_INVALID;
2326                         if (ctl_port_deregister(&ct->ct_port) != 0)
2327                                 printf("%s: ctl_port_deregister() failed\n",
2328                                     __func__);
2329                 }
2330                 free(ct, M_CFISCSI);
2331
2332                 return;
2333         }
2334         mtx_unlock(&softc->lock);
2335 }
2336
2337 static struct cfiscsi_target *
2338 cfiscsi_target_find(struct cfiscsi_softc *softc, const char *name, uint16_t tag)
2339 {
2340         struct cfiscsi_target *ct;
2341
2342         mtx_lock(&softc->lock);
2343         TAILQ_FOREACH(ct, &softc->targets, ct_next) {
2344                 if (ct->ct_tag != tag ||
2345                     strcmp(name, ct->ct_name) != 0 ||
2346                     ct->ct_state != CFISCSI_TARGET_STATE_ACTIVE)
2347                         continue;
2348                 cfiscsi_target_hold(ct);
2349                 mtx_unlock(&softc->lock);
2350                 return (ct);
2351         }
2352         mtx_unlock(&softc->lock);
2353
2354         return (NULL);
2355 }
2356
2357 static struct cfiscsi_target *
2358 cfiscsi_target_find_or_create(struct cfiscsi_softc *softc, const char *name,
2359     const char *alias, uint16_t tag)
2360 {
2361         struct cfiscsi_target *ct, *newct;
2362
2363         if (name[0] == '\0' || strlen(name) >= CTL_ISCSI_NAME_LEN)
2364                 return (NULL);
2365
2366         newct = malloc(sizeof(*newct), M_CFISCSI, M_WAITOK | M_ZERO);
2367
2368         mtx_lock(&softc->lock);
2369         TAILQ_FOREACH(ct, &softc->targets, ct_next) {
2370                 if (ct->ct_tag != tag ||
2371                     strcmp(name, ct->ct_name) != 0 ||
2372                     ct->ct_state == CFISCSI_TARGET_STATE_INVALID)
2373                         continue;
2374                 cfiscsi_target_hold(ct);
2375                 mtx_unlock(&softc->lock);
2376                 free(newct, M_CFISCSI);
2377                 return (ct);
2378         }
2379
2380         strlcpy(newct->ct_name, name, sizeof(newct->ct_name));
2381         if (alias != NULL)
2382                 strlcpy(newct->ct_alias, alias, sizeof(newct->ct_alias));
2383         newct->ct_tag = tag;
2384         refcount_init(&newct->ct_refcount, 1);
2385         newct->ct_softc = softc;
2386         if (TAILQ_EMPTY(&softc->targets))
2387                 softc->last_target_id = 0;
2388         newct->ct_target_id = ++softc->last_target_id;
2389         TAILQ_INSERT_TAIL(&softc->targets, newct, ct_next);
2390         mtx_unlock(&softc->lock);
2391
2392         return (newct);
2393 }
2394
2395 static void
2396 cfiscsi_datamove_in(union ctl_io *io)
2397 {
2398         struct cfiscsi_session *cs;
2399         struct icl_pdu *request, *response;
2400         const struct iscsi_bhs_scsi_command *bhssc;
2401         struct iscsi_bhs_data_in *bhsdi;
2402         struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
2403         size_t len, expected_len, sg_len, buffer_offset;
2404         const char *sg_addr;
2405         int ctl_sg_count, error, i;
2406
2407         request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
2408         cs = PDU_SESSION(request);
2409
2410         bhssc = (const struct iscsi_bhs_scsi_command *)request->ip_bhs;
2411         KASSERT((bhssc->bhssc_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
2412             ISCSI_BHS_OPCODE_SCSI_COMMAND,
2413             ("bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_COMMAND"));
2414
2415         if (io->scsiio.kern_sg_entries > 0) {
2416                 ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
2417                 ctl_sg_count = io->scsiio.kern_sg_entries;
2418         } else {
2419                 ctl_sglist = &ctl_sg_entry;
2420                 ctl_sglist->addr = io->scsiio.kern_data_ptr;
2421                 ctl_sglist->len = io->scsiio.kern_data_len;
2422                 ctl_sg_count = 1;
2423         }
2424
2425         /*
2426          * This is the total amount of data to be transferred within the current
2427          * SCSI command.  We need to record it so that we can properly report
2428          * underflow/underflow.
2429          */
2430         PDU_TOTAL_TRANSFER_LEN(request) = io->scsiio.kern_total_len;
2431
2432         /*
2433          * This is the offset within the current SCSI command; for the first
2434          * call to cfiscsi_datamove() it will be 0, and for subsequent ones
2435          * it will be the sum of lengths of previous ones.
2436          */
2437         buffer_offset = io->scsiio.kern_rel_offset;
2438
2439         /*
2440          * This is the transfer length expected by the initiator.  In theory,
2441          * it could be different from the correct amount of data from the SCSI
2442          * point of view, even if that doesn't make any sense.
2443          */
2444         expected_len = ntohl(bhssc->bhssc_expected_data_transfer_length);
2445 #if 0
2446         if (expected_len != io->scsiio.kern_total_len) {
2447                 CFISCSI_SESSION_DEBUG(cs, "expected transfer length %zd, "
2448                     "actual length %zd", expected_len,
2449                     (size_t)io->scsiio.kern_total_len);
2450         }
2451 #endif
2452
2453         if (buffer_offset >= expected_len) {
2454 #if 0
2455                 CFISCSI_SESSION_DEBUG(cs, "buffer_offset = %zd, "
2456                     "already sent the expected len", buffer_offset);
2457 #endif
2458                 io->scsiio.be_move_done(io);
2459                 return;
2460         }
2461
2462         i = 0;
2463         sg_addr = NULL;
2464         sg_len = 0;
2465         response = NULL;
2466         bhsdi = NULL;
2467         for (;;) {
2468                 if (response == NULL) {
2469                         response = cfiscsi_pdu_new_response(request, M_NOWAIT);
2470                         if (response == NULL) {
2471                                 CFISCSI_SESSION_WARN(cs, "failed to "
2472                                     "allocate memory; dropping connection");
2473                                 ctl_set_busy(&io->scsiio);
2474                                 io->scsiio.be_move_done(io);
2475                                 cfiscsi_session_terminate(cs);
2476                                 return;
2477                         }
2478                         bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs;
2479                         bhsdi->bhsdi_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_IN;
2480                         bhsdi->bhsdi_initiator_task_tag =
2481                             bhssc->bhssc_initiator_task_tag;
2482                         bhsdi->bhsdi_target_transfer_tag = 0xffffffff;
2483                         bhsdi->bhsdi_datasn = htonl(PDU_EXPDATASN(request));
2484                         PDU_EXPDATASN(request)++;
2485                         bhsdi->bhsdi_buffer_offset = htonl(buffer_offset);
2486                 }
2487
2488                 KASSERT(i < ctl_sg_count, ("i >= ctl_sg_count"));
2489                 if (sg_len == 0) {
2490                         sg_addr = ctl_sglist[i].addr;
2491                         sg_len = ctl_sglist[i].len;
2492                         KASSERT(sg_len > 0, ("sg_len <= 0"));
2493                 }
2494
2495                 len = sg_len;
2496
2497                 /*
2498                  * Truncate to maximum data segment length.
2499                  */
2500                 KASSERT(response->ip_data_len < cs->cs_max_send_data_segment_length,
2501                     ("ip_data_len %zd >= max_send_data_segment_length %d",
2502                     response->ip_data_len, cs->cs_max_send_data_segment_length));
2503                 if (response->ip_data_len + len >
2504                     cs->cs_max_send_data_segment_length) {
2505                         len = cs->cs_max_send_data_segment_length -
2506                             response->ip_data_len;
2507                         KASSERT(len <= sg_len, ("len %zd > sg_len %zd",
2508                             len, sg_len));
2509                 }
2510
2511                 /*
2512                  * Truncate to expected data transfer length.
2513                  */
2514                 KASSERT(buffer_offset + response->ip_data_len < expected_len,
2515                     ("buffer_offset %zd + ip_data_len %zd >= expected_len %zd",
2516                     buffer_offset, response->ip_data_len, expected_len));
2517                 if (buffer_offset + response->ip_data_len + len > expected_len) {
2518                         CFISCSI_SESSION_DEBUG(cs, "truncating from %zd "
2519                             "to expected data transfer length %zd",
2520                             buffer_offset + response->ip_data_len + len, expected_len);
2521                         len = expected_len - (buffer_offset + response->ip_data_len);
2522                         KASSERT(len <= sg_len, ("len %zd > sg_len %zd",
2523                             len, sg_len));
2524                 }
2525
2526                 error = icl_pdu_append_data(response, sg_addr, len, M_NOWAIT);
2527                 if (error != 0) {
2528                         CFISCSI_SESSION_WARN(cs, "failed to "
2529                             "allocate memory; dropping connection");
2530                         icl_pdu_free(response);
2531                         ctl_set_busy(&io->scsiio);
2532                         io->scsiio.be_move_done(io);
2533                         cfiscsi_session_terminate(cs);
2534                         return;
2535                 }
2536                 sg_addr += len;
2537                 sg_len -= len;
2538                 io->scsiio.kern_data_resid -= len;
2539
2540                 KASSERT(buffer_offset + response->ip_data_len <= expected_len,
2541                     ("buffer_offset %zd + ip_data_len %zd > expected_len %zd",
2542                     buffer_offset, response->ip_data_len, expected_len));
2543                 if (buffer_offset + response->ip_data_len == expected_len) {
2544                         /*
2545                          * Already have the amount of data the initiator wanted.
2546                          */
2547                         break;
2548                 }
2549
2550                 if (sg_len == 0) {
2551                         /*
2552                          * End of scatter-gather segment;
2553                          * proceed to the next one...
2554                          */
2555                         if (i == ctl_sg_count - 1) {
2556                                 /*
2557                                  * ... unless this was the last one.
2558                                  */
2559                                 break;
2560                         }
2561                         i++;
2562                 }
2563
2564                 if (response->ip_data_len == cs->cs_max_send_data_segment_length) {
2565                         /*
2566                          * Can't stuff more data into the current PDU;
2567                          * queue it.  Note that's not enough to check
2568                          * for kern_data_resid == 0 instead; there
2569                          * may be several Data-In PDUs for the final
2570                          * call to cfiscsi_datamove(), and we want
2571                          * to set the F flag only on the last of them.
2572                          */
2573                         buffer_offset += response->ip_data_len;
2574                         if (buffer_offset == io->scsiio.kern_total_len ||
2575                             buffer_offset == expected_len) {
2576                                 buffer_offset -= response->ip_data_len;
2577                                 break;
2578                         }
2579                         cfiscsi_pdu_queue(response);
2580                         response = NULL;
2581                         bhsdi = NULL;
2582                 }
2583         }
2584         if (response != NULL) {
2585                 buffer_offset += response->ip_data_len;
2586                 if (buffer_offset == io->scsiio.kern_total_len ||
2587                     buffer_offset == expected_len) {
2588                         bhsdi->bhsdi_flags |= BHSDI_FLAGS_F;
2589                         if (io->io_hdr.status == CTL_SUCCESS) {
2590                                 bhsdi->bhsdi_flags |= BHSDI_FLAGS_S;
2591                                 if (PDU_TOTAL_TRANSFER_LEN(request) <
2592                                     ntohl(bhssc->bhssc_expected_data_transfer_length)) {
2593                                         bhsdi->bhsdi_flags |= BHSSR_FLAGS_RESIDUAL_UNDERFLOW;
2594                                         bhsdi->bhsdi_residual_count =
2595                                             htonl(ntohl(bhssc->bhssc_expected_data_transfer_length) -
2596                                             PDU_TOTAL_TRANSFER_LEN(request));
2597                                 } else if (PDU_TOTAL_TRANSFER_LEN(request) >
2598                                     ntohl(bhssc->bhssc_expected_data_transfer_length)) {
2599                                         bhsdi->bhsdi_flags |= BHSSR_FLAGS_RESIDUAL_OVERFLOW;
2600                                         bhsdi->bhsdi_residual_count =
2601                                             htonl(PDU_TOTAL_TRANSFER_LEN(request) -
2602                                             ntohl(bhssc->bhssc_expected_data_transfer_length));
2603                                 }
2604                                 bhsdi->bhsdi_status = io->scsiio.scsi_status;
2605                                 io->io_hdr.flags |= CTL_FLAG_STATUS_SENT;
2606                         }
2607                 }
2608                 KASSERT(response->ip_data_len > 0, ("sending empty Data-In"));
2609                 cfiscsi_pdu_queue(response);
2610         }
2611
2612         io->scsiio.be_move_done(io);
2613 }
2614
2615 static void
2616 cfiscsi_datamove_out(union ctl_io *io)
2617 {
2618         struct cfiscsi_session *cs;
2619         struct icl_pdu *request, *response;
2620         const struct iscsi_bhs_scsi_command *bhssc;
2621         struct iscsi_bhs_r2t *bhsr2t;
2622         struct cfiscsi_data_wait *cdw;
2623         struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
2624         uint32_t expected_len, datamove_len, r2t_off, r2t_len;
2625         uint32_t target_transfer_tag;
2626         bool done;
2627
2628         request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
2629         cs = PDU_SESSION(request);
2630
2631         bhssc = (const struct iscsi_bhs_scsi_command *)request->ip_bhs;
2632         KASSERT((bhssc->bhssc_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
2633             ISCSI_BHS_OPCODE_SCSI_COMMAND,
2634             ("bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_COMMAND"));
2635
2636         /*
2637          * We need to record it so that we can properly report
2638          * underflow/underflow.
2639          */
2640         PDU_TOTAL_TRANSFER_LEN(request) = io->scsiio.kern_total_len;
2641
2642         /*
2643          * Complete write underflow.  Not a single byte to read.  Return.
2644          */
2645         expected_len = ntohl(bhssc->bhssc_expected_data_transfer_length);
2646         if (io->scsiio.kern_rel_offset >= expected_len) {
2647                 io->scsiio.be_move_done(io);
2648                 return;
2649         }
2650         datamove_len = MIN(io->scsiio.kern_data_len,
2651             expected_len - io->scsiio.kern_rel_offset);
2652
2653         target_transfer_tag =
2654             atomic_fetchadd_32(&cs->cs_target_transfer_tag, 1);
2655         cdw = cfiscsi_data_wait_new(cs, io, bhssc->bhssc_initiator_task_tag,
2656             &target_transfer_tag);
2657         if (cdw == NULL) {
2658                 CFISCSI_SESSION_WARN(cs, "failed to "
2659                     "allocate memory; dropping connection");
2660                 ctl_set_busy(&io->scsiio);
2661                 io->scsiio.be_move_done(io);
2662                 cfiscsi_session_terminate(cs);
2663                 return;
2664         }
2665 #if 0
2666         CFISCSI_SESSION_DEBUG(cs, "expecting Data-Out with initiator "
2667             "task tag 0x%x, target transfer tag 0x%x",
2668             bhssc->bhssc_initiator_task_tag, target_transfer_tag);
2669 #endif
2670
2671         cdw->cdw_ctl_io = io;
2672         cdw->cdw_target_transfer_tag = target_transfer_tag;
2673         cdw->cdw_initiator_task_tag = bhssc->bhssc_initiator_task_tag;
2674         cdw->cdw_r2t_end = datamove_len;
2675         cdw->cdw_datasn = 0;
2676
2677         /* Set initial data pointer for the CDW respecting ext_data_filled. */
2678         if (io->scsiio.kern_sg_entries > 0) {
2679                 ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
2680         } else {
2681                 ctl_sglist = &ctl_sg_entry;
2682                 ctl_sglist->addr = io->scsiio.kern_data_ptr;
2683                 ctl_sglist->len = datamove_len;
2684         }
2685         cdw->cdw_sg_index = 0;
2686         cdw->cdw_sg_addr = ctl_sglist[cdw->cdw_sg_index].addr;
2687         cdw->cdw_sg_len = ctl_sglist[cdw->cdw_sg_index].len;
2688         r2t_off = io->scsiio.ext_data_filled;
2689         while (r2t_off > 0) {
2690                 if (r2t_off >= cdw->cdw_sg_len) {
2691                         r2t_off -= cdw->cdw_sg_len;
2692                         cdw->cdw_sg_index++;
2693                         cdw->cdw_sg_addr = ctl_sglist[cdw->cdw_sg_index].addr;
2694                         cdw->cdw_sg_len = ctl_sglist[cdw->cdw_sg_index].len;
2695                         continue;
2696                 }
2697                 cdw->cdw_sg_addr += r2t_off;
2698                 cdw->cdw_sg_len -= r2t_off;
2699                 r2t_off = 0;
2700         }
2701
2702         if (cs->cs_immediate_data &&
2703             io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled <
2704             icl_pdu_data_segment_length(request)) {
2705                 done = cfiscsi_handle_data_segment(request, cdw);
2706                 if (done) {
2707                         cfiscsi_data_wait_free(cs, cdw);
2708                         io->scsiio.be_move_done(io);
2709                         return;
2710                 }
2711         }
2712
2713         r2t_off = io->scsiio.kern_rel_offset + io->scsiio.ext_data_filled;
2714         r2t_len = MIN(datamove_len - io->scsiio.ext_data_filled,
2715             cs->cs_max_burst_length);
2716         cdw->cdw_r2t_end = io->scsiio.ext_data_filled + r2t_len;
2717
2718         CFISCSI_SESSION_LOCK(cs);
2719         TAILQ_INSERT_TAIL(&cs->cs_waiting_for_data_out, cdw, cdw_next);
2720         CFISCSI_SESSION_UNLOCK(cs);
2721
2722         /*
2723          * XXX: We should limit the number of outstanding R2T PDUs
2724          *      per task to MaxOutstandingR2T.
2725          */
2726         response = cfiscsi_pdu_new_response(request, M_NOWAIT);
2727         if (response == NULL) {
2728                 CFISCSI_SESSION_WARN(cs, "failed to "
2729                     "allocate memory; dropping connection");
2730                 ctl_set_busy(&io->scsiio);
2731                 io->scsiio.be_move_done(io);
2732                 cfiscsi_session_terminate(cs);
2733                 return;
2734         }
2735         io->io_hdr.flags |= CTL_FLAG_DMA_INPROG;
2736         bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs;
2737         bhsr2t->bhsr2t_opcode = ISCSI_BHS_OPCODE_R2T;
2738         bhsr2t->bhsr2t_flags = 0x80;
2739         bhsr2t->bhsr2t_lun = bhssc->bhssc_lun;
2740         bhsr2t->bhsr2t_initiator_task_tag = bhssc->bhssc_initiator_task_tag;
2741         bhsr2t->bhsr2t_target_transfer_tag = target_transfer_tag;
2742         /*
2743          * XXX: Here we assume that cfiscsi_datamove() won't ever
2744          *      be running concurrently on several CPUs for a given
2745          *      command.
2746          */
2747         bhsr2t->bhsr2t_r2tsn = htonl(PDU_R2TSN(request));
2748         PDU_R2TSN(request)++;
2749         /*
2750          * This is the offset within the current SCSI command;
2751          * i.e. for the first call of datamove(), it will be 0,
2752          * and for subsequent ones it will be the sum of lengths
2753          * of previous ones.
2754          *
2755          * The ext_data_filled is to account for unsolicited
2756          * (immediate) data that might have already arrived.
2757          */
2758         bhsr2t->bhsr2t_buffer_offset = htonl(r2t_off);
2759         /*
2760          * This is the total length (sum of S/G lengths) this call
2761          * to cfiscsi_datamove() is supposed to handle, limited by
2762          * MaxBurstLength.
2763          */
2764         bhsr2t->bhsr2t_desired_data_transfer_length = htonl(r2t_len);
2765         cfiscsi_pdu_queue(response);
2766 }
2767
2768 static void
2769 cfiscsi_datamove(union ctl_io *io)
2770 {
2771
2772         if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_IN)
2773                 cfiscsi_datamove_in(io);
2774         else {
2775                 /* We hadn't received anything during this datamove yet. */
2776                 io->scsiio.ext_data_filled = 0;
2777                 cfiscsi_datamove_out(io);
2778         }
2779 }
2780
2781 static void
2782 cfiscsi_scsi_command_done(union ctl_io *io)
2783 {
2784         struct icl_pdu *request, *response;
2785         struct iscsi_bhs_scsi_command *bhssc;
2786         struct iscsi_bhs_scsi_response *bhssr;
2787 #ifdef DIAGNOSTIC
2788         struct cfiscsi_data_wait *cdw;
2789 #endif
2790         struct cfiscsi_session *cs;
2791         uint16_t sense_length;
2792
2793         request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
2794         cs = PDU_SESSION(request);
2795         bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs;
2796         KASSERT((bhssc->bhssc_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
2797             ISCSI_BHS_OPCODE_SCSI_COMMAND,
2798             ("replying to wrong opcode 0x%x", bhssc->bhssc_opcode));
2799
2800         //CFISCSI_SESSION_DEBUG(cs, "initiator task tag 0x%x",
2801         //    bhssc->bhssc_initiator_task_tag);
2802
2803 #ifdef DIAGNOSTIC
2804         CFISCSI_SESSION_LOCK(cs);
2805         TAILQ_FOREACH(cdw, &cs->cs_waiting_for_data_out, cdw_next)
2806                 KASSERT(bhssc->bhssc_initiator_task_tag !=
2807                     cdw->cdw_initiator_task_tag, ("dangling cdw"));
2808         CFISCSI_SESSION_UNLOCK(cs);
2809 #endif
2810
2811         /*
2812          * Do not return status for aborted commands.
2813          * There are exceptions, but none supported by CTL yet.
2814          */
2815         if (((io->io_hdr.flags & CTL_FLAG_ABORT) &&
2816              (io->io_hdr.flags & CTL_FLAG_ABORT_STATUS) == 0) ||
2817             (io->io_hdr.flags & CTL_FLAG_STATUS_SENT)) {
2818                 ctl_free_io(io);
2819                 icl_pdu_free(request);
2820                 return;
2821         }
2822
2823         response = cfiscsi_pdu_new_response(request, M_WAITOK);
2824         bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs;
2825         bhssr->bhssr_opcode = ISCSI_BHS_OPCODE_SCSI_RESPONSE;
2826         bhssr->bhssr_flags = 0x80;
2827         /*
2828          * XXX: We don't deal with bidirectional under/overflows;
2829          *      does anything actually support those?
2830          */
2831         if (PDU_TOTAL_TRANSFER_LEN(request) <
2832             ntohl(bhssc->bhssc_expected_data_transfer_length)) {
2833                 bhssr->bhssr_flags |= BHSSR_FLAGS_RESIDUAL_UNDERFLOW;
2834                 bhssr->bhssr_residual_count =
2835                     htonl(ntohl(bhssc->bhssc_expected_data_transfer_length) -
2836                     PDU_TOTAL_TRANSFER_LEN(request));
2837                 //CFISCSI_SESSION_DEBUG(cs, "underflow; residual count %d",
2838                 //    ntohl(bhssr->bhssr_residual_count));
2839         } else if (PDU_TOTAL_TRANSFER_LEN(request) >
2840             ntohl(bhssc->bhssc_expected_data_transfer_length)) {
2841                 bhssr->bhssr_flags |= BHSSR_FLAGS_RESIDUAL_OVERFLOW;
2842                 bhssr->bhssr_residual_count =
2843                     htonl(PDU_TOTAL_TRANSFER_LEN(request) -
2844                     ntohl(bhssc->bhssc_expected_data_transfer_length));
2845                 //CFISCSI_SESSION_DEBUG(cs, "overflow; residual count %d",
2846                 //    ntohl(bhssr->bhssr_residual_count));
2847         }
2848         bhssr->bhssr_response = BHSSR_RESPONSE_COMMAND_COMPLETED;
2849         bhssr->bhssr_status = io->scsiio.scsi_status;
2850         bhssr->bhssr_initiator_task_tag = bhssc->bhssc_initiator_task_tag;
2851         bhssr->bhssr_expdatasn = htonl(PDU_EXPDATASN(request));
2852
2853         if (io->scsiio.sense_len > 0) {
2854 #if 0
2855                 CFISCSI_SESSION_DEBUG(cs, "returning %d bytes of sense data",
2856                     io->scsiio.sense_len);
2857 #endif
2858                 sense_length = htons(io->scsiio.sense_len);
2859                 icl_pdu_append_data(response,
2860                     &sense_length, sizeof(sense_length), M_WAITOK);
2861                 icl_pdu_append_data(response,
2862                     &io->scsiio.sense_data, io->scsiio.sense_len, M_WAITOK);
2863         }
2864
2865         ctl_free_io(io);
2866         icl_pdu_free(request);
2867         cfiscsi_pdu_queue(response);
2868 }
2869
2870 static void
2871 cfiscsi_task_management_done(union ctl_io *io)
2872 {
2873         struct icl_pdu *request, *response;
2874         struct iscsi_bhs_task_management_request *bhstmr;
2875         struct iscsi_bhs_task_management_response *bhstmr2;
2876         struct cfiscsi_data_wait *cdw, *tmpcdw;
2877         struct cfiscsi_session *cs, *tcs;
2878         struct cfiscsi_softc *softc;
2879         int cold_reset = 0;
2880
2881         request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
2882         cs = PDU_SESSION(request);
2883         bhstmr = (struct iscsi_bhs_task_management_request *)request->ip_bhs;
2884         KASSERT((bhstmr->bhstmr_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) ==
2885             ISCSI_BHS_OPCODE_TASK_REQUEST,
2886             ("replying to wrong opcode 0x%x", bhstmr->bhstmr_opcode));
2887
2888 #if 0
2889         CFISCSI_SESSION_DEBUG(cs, "initiator task tag 0x%x; referenced task tag 0x%x",
2890             bhstmr->bhstmr_initiator_task_tag,
2891             bhstmr->bhstmr_referenced_task_tag);
2892 #endif
2893
2894         if ((bhstmr->bhstmr_function & ~0x80) ==
2895             BHSTMR_FUNCTION_ABORT_TASK) {
2896                 /*
2897                  * Make sure we no longer wait for Data-Out for this command.
2898                  */
2899                 CFISCSI_SESSION_LOCK(cs);
2900                 TAILQ_FOREACH_SAFE(cdw,
2901                     &cs->cs_waiting_for_data_out, cdw_next, tmpcdw) {
2902                         if (bhstmr->bhstmr_referenced_task_tag !=
2903                             cdw->cdw_initiator_task_tag)
2904                                 continue;
2905
2906 #if 0
2907                         CFISCSI_SESSION_DEBUG(cs, "removing csw for initiator task "
2908                             "tag 0x%x", bhstmr->bhstmr_initiator_task_tag);
2909 #endif
2910                         TAILQ_REMOVE(&cs->cs_waiting_for_data_out,
2911                             cdw, cdw_next);
2912                         io->io_hdr.flags &= ~CTL_FLAG_DMA_INPROG;
2913                         cdw->cdw_ctl_io->scsiio.io_hdr.port_status = 43;
2914                         cdw->cdw_ctl_io->scsiio.be_move_done(cdw->cdw_ctl_io);
2915                         cfiscsi_data_wait_free(cs, cdw);
2916                 }
2917                 CFISCSI_SESSION_UNLOCK(cs);
2918         }
2919         if ((bhstmr->bhstmr_function & ~0x80) ==
2920             BHSTMR_FUNCTION_TARGET_COLD_RESET &&
2921             io->io_hdr.status == CTL_SUCCESS)
2922                 cold_reset = 1;
2923
2924         response = cfiscsi_pdu_new_response(request, M_WAITOK);
2925         bhstmr2 = (struct iscsi_bhs_task_management_response *)
2926             response->ip_bhs;
2927         bhstmr2->bhstmr_opcode = ISCSI_BHS_OPCODE_TASK_RESPONSE;
2928         bhstmr2->bhstmr_flags = 0x80;
2929         switch (io->taskio.task_status) {
2930         case CTL_TASK_FUNCTION_COMPLETE:
2931                 bhstmr2->bhstmr_response = BHSTMR_RESPONSE_FUNCTION_COMPLETE;
2932                 break;
2933         case CTL_TASK_FUNCTION_SUCCEEDED:
2934                 bhstmr2->bhstmr_response = BHSTMR_RESPONSE_FUNCTION_SUCCEEDED;
2935                 break;
2936         case CTL_TASK_LUN_DOES_NOT_EXIST:
2937                 bhstmr2->bhstmr_response = BHSTMR_RESPONSE_LUN_DOES_NOT_EXIST;
2938                 break;
2939         case CTL_TASK_FUNCTION_NOT_SUPPORTED:
2940         default:
2941                 bhstmr2->bhstmr_response = BHSTMR_RESPONSE_FUNCTION_NOT_SUPPORTED;
2942                 break;
2943         }
2944         memcpy(bhstmr2->bhstmr_additional_reponse_information,
2945             io->taskio.task_resp, sizeof(io->taskio.task_resp));
2946         bhstmr2->bhstmr_initiator_task_tag = bhstmr->bhstmr_initiator_task_tag;
2947
2948         ctl_free_io(io);
2949         icl_pdu_free(request);
2950         cfiscsi_pdu_queue(response);
2951
2952         if (cold_reset) {
2953                 softc = cs->cs_target->ct_softc;
2954                 mtx_lock(&softc->lock);
2955                 TAILQ_FOREACH(tcs, &softc->sessions, cs_next) {
2956                         if (tcs->cs_target == cs->cs_target)
2957                                 cfiscsi_session_terminate(tcs);
2958                 }
2959                 mtx_unlock(&softc->lock);
2960         }
2961 }
2962
2963 static void
2964 cfiscsi_done(union ctl_io *io)
2965 {
2966         struct icl_pdu *request;
2967         struct cfiscsi_session *cs;
2968
2969         KASSERT(((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE),
2970                 ("invalid CTL status %#x", io->io_hdr.status));
2971
2972         if (io->io_hdr.io_type == CTL_IO_TASK &&
2973             io->taskio.task_action == CTL_TASK_I_T_NEXUS_RESET) {
2974                 /*
2975                  * Implicit task termination has just completed; nothing to do.
2976                  */
2977                 cs = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
2978                 cs->cs_tasks_aborted = true;
2979                 refcount_release(&cs->cs_outstanding_ctl_pdus);
2980                 wakeup(__DEVOLATILE(void *, &cs->cs_outstanding_ctl_pdus));
2981                 ctl_free_io(io);
2982                 return;
2983         }
2984
2985         request = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
2986         cs = PDU_SESSION(request);
2987
2988         switch (request->ip_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) {
2989         case ISCSI_BHS_OPCODE_SCSI_COMMAND:
2990                 cfiscsi_scsi_command_done(io);
2991                 break;
2992         case ISCSI_BHS_OPCODE_TASK_REQUEST:
2993                 cfiscsi_task_management_done(io);
2994                 break;
2995         default:
2996                 panic("cfiscsi_done called with wrong opcode 0x%x",
2997                     request->ip_bhs->bhs_opcode);
2998         }
2999
3000         refcount_release(&cs->cs_outstanding_ctl_pdus);
3001 }