Pileus Git - ~andy/linux/blob - drivers/vhost/tcm_vhost.c

   1 /*******************************************************************************
   2  * Vhost kernel TCM fabric driver for virtio SCSI initiators
   3  *
   4  * (C) Copyright 2010-2012 RisingTide Systems LLC.
   5  * (C) Copyright 2010-2012 IBM Corp.
   6  *
   7  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   8  *
   9  * Authors: Nicholas A. Bellinger <nab@risingtidesystems.com>
  10  *          Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  ****************************************************************************/
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <generated/utsrelease.h>
  27 #include <linux/utsname.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/kthread.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/configfs.h>
  34 #include <linux/ctype.h>
  35 #include <linux/compat.h>
  36 #include <linux/eventfd.h>
  37 #include <linux/vhost.h>
  38 #include <linux/fs.h>
  39 #include <linux/miscdevice.h>
  40 #include <asm/unaligned.h>
  41 #include <scsi/scsi.h>
  42 #include <scsi/scsi_tcq.h>
  43 #include <target/target_core_base.h>
  44 #include <target/target_core_fabric.h>
  45 #include <target/target_core_fabric_configfs.h>
  46 #include <target/target_core_configfs.h>
  47 #include <target/configfs_macros.h>
  48 #include <linux/vhost.h>
  49 #include <linux/virtio_net.h> /* TODO vhost.h currently depends on this */
  50 #include <linux/virtio_scsi.h>
  51
  52 #include "vhost.c"
  53 #include "vhost.h"
  54 #include "tcm_vhost.h"
  55
  56 struct vhost_scsi {
  57         atomic_t vhost_ref_cnt;
  58         struct tcm_vhost_tpg *vs_tpg;
  59         struct vhost_dev dev;
  60         struct vhost_virtqueue vqs[3];
  61
  62         struct vhost_work vs_completion_work; /* cmd completion work item */
  63         struct list_head vs_completion_list;  /* cmd completion queue */
  64         spinlock_t vs_completion_lock;        /* protects s_completion_list */
  65 };
  66
  67 /* Local pointer to allocated TCM configfs fabric module */
  68 static struct target_fabric_configfs *tcm_vhost_fabric_configfs;
  69
  70 static struct workqueue_struct *tcm_vhost_workqueue;
  71
  72 /* Global spinlock to protect tcm_vhost TPG list for vhost IOCTL access */
  73 static DEFINE_MUTEX(tcm_vhost_mutex);
  74 static LIST_HEAD(tcm_vhost_list);
  75
  76 static int tcm_vhost_check_true(struct se_portal_group *se_tpg)
  77 {
  78         return 1;
  79 }
  80
  81 static int tcm_vhost_check_false(struct se_portal_group *se_tpg)
  82 {
  83         return 0;
  84 }
  85
  86 static char *tcm_vhost_get_fabric_name(void)
  87 {
  88         return "vhost";
  89 }
  90
  91 static u8 tcm_vhost_get_fabric_proto_ident(struct se_portal_group *se_tpg)
  92 {
  93         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
  94                                 struct tcm_vhost_tpg, se_tpg);
  95         struct tcm_vhost_tport *tport = tpg->tport;
  96
  97         switch (tport->tport_proto_id) {
  98         case SCSI_PROTOCOL_SAS:
  99                 return sas_get_fabric_proto_ident(se_tpg);
 100         case SCSI_PROTOCOL_FCP:
 101                 return fc_get_fabric_proto_ident(se_tpg);
 102         case SCSI_PROTOCOL_ISCSI:
 103                 return iscsi_get_fabric_proto_ident(se_tpg);
 104         default:
 105                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 106                         " SAS emulation\n", tport->tport_proto_id);
 107                 break;
 108         }
 109
 110         return sas_get_fabric_proto_ident(se_tpg);
 111 }
 112
 113 static char *tcm_vhost_get_fabric_wwn(struct se_portal_group *se_tpg)
 114 {
 115         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
 116                                 struct tcm_vhost_tpg, se_tpg);
 117         struct tcm_vhost_tport *tport = tpg->tport;
 118
 119         return &tport->tport_name[0];
 120 }
 121
 122 static u16 tcm_vhost_get_tag(struct se_portal_group *se_tpg)
 123 {
 124         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
 125                                 struct tcm_vhost_tpg, se_tpg);
 126         return tpg->tport_tpgt;
 127 }
 128
 129 static u32 tcm_vhost_get_default_depth(struct se_portal_group *se_tpg)
 130 {
 131         return 1;
 132 }
 133
 134 static u32 tcm_vhost_get_pr_transport_id(
 135         struct se_portal_group *se_tpg,
 136         struct se_node_acl *se_nacl,
 137         struct t10_pr_registration *pr_reg,
 138         int *format_code,
 139         unsigned char *buf)
 140 {
 141         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
 142                                 struct tcm_vhost_tpg, se_tpg);
 143         struct tcm_vhost_tport *tport = tpg->tport;
 144
 145         switch (tport->tport_proto_id) {
 146         case SCSI_PROTOCOL_SAS:
 147                 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 148                                         format_code, buf);
 149         case SCSI_PROTOCOL_FCP:
 150                 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 151                                         format_code, buf);
 152         case SCSI_PROTOCOL_ISCSI:
 153                 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 154                                         format_code, buf);
 155         default:
 156                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 157                         " SAS emulation\n", tport->tport_proto_id);
 158                 break;
 159         }
 160
 161         return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
 162                         format_code, buf);
 163 }
 164
 165 static u32 tcm_vhost_get_pr_transport_id_len(
 166         struct se_portal_group *se_tpg,
 167         struct se_node_acl *se_nacl,
 168         struct t10_pr_registration *pr_reg,
 169         int *format_code)
 170 {
 171         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
 172                                 struct tcm_vhost_tpg, se_tpg);
 173         struct tcm_vhost_tport *tport = tpg->tport;
 174
 175         switch (tport->tport_proto_id) {
 176         case SCSI_PROTOCOL_SAS:
 177                 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 178                                         format_code);
 179         case SCSI_PROTOCOL_FCP:
 180                 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 181                                         format_code);
 182         case SCSI_PROTOCOL_ISCSI:
 183                 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 184                                         format_code);
 185         default:
 186                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 187                         " SAS emulation\n", tport->tport_proto_id);
 188                 break;
 189         }
 190
 191         return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
 192                         format_code);
 193 }
 194
 195 static char *tcm_vhost_parse_pr_out_transport_id(
 196         struct se_portal_group *se_tpg,
 197         const char *buf,
 198         u32 *out_tid_len,
 199         char **port_nexus_ptr)
 200 {
 201         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
 202                                 struct tcm_vhost_tpg, se_tpg);
 203         struct tcm_vhost_tport *tport = tpg->tport;
 204
 205         switch (tport->tport_proto_id) {
 206         case SCSI_PROTOCOL_SAS:
 207                 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 208                                         port_nexus_ptr);
 209         case SCSI_PROTOCOL_FCP:
 210                 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 211                                         port_nexus_ptr);
 212         case SCSI_PROTOCOL_ISCSI:
 213                 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 214                                         port_nexus_ptr);
 215         default:
 216                 pr_err("Unknown tport_proto_id: 0x%02x, using"
 217                         " SAS emulation\n", tport->tport_proto_id);
 218                 break;
 219         }
 220
 221         return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
 222                         port_nexus_ptr);
 223 }
 224
 225 static struct se_node_acl *tcm_vhost_alloc_fabric_acl(
 226         struct se_portal_group *se_tpg)
 227 {
 228         struct tcm_vhost_nacl *nacl;
 229
 230         nacl = kzalloc(sizeof(struct tcm_vhost_nacl), GFP_KERNEL);
 231         if (!nacl) {
 232                 pr_err("Unable to alocate struct tcm_vhost_nacl\n");
 233                 return NULL;
 234         }
 235
 236         return &nacl->se_node_acl;
 237 }
 238
 239 static void tcm_vhost_release_fabric_acl(
 240         struct se_portal_group *se_tpg,
 241         struct se_node_acl *se_nacl)
 242 {
 243         struct tcm_vhost_nacl *nacl = container_of(se_nacl,
 244                         struct tcm_vhost_nacl, se_node_acl);
 245         kfree(nacl);
 246 }
 247
 248 static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg)
 249 {
 250         return 1;
 251 }
 252
 253 static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
 254 {
 255         return;
 256 }
 257
 258 static int tcm_vhost_shutdown_session(struct se_session *se_sess)
 259 {
 260         return 0;
 261 }
 262
 263 static void tcm_vhost_close_session(struct se_session *se_sess)
 264 {
 265         return;
 266 }
 267
 268 static u32 tcm_vhost_sess_get_index(struct se_session *se_sess)
 269 {
 270         return 0;
 271 }
 272
 273 static int tcm_vhost_write_pending(struct se_cmd *se_cmd)
 274 {
 275         /* Go ahead and process the write immediately */
 276         target_execute_cmd(se_cmd);
 277         return 0;
 278 }
 279
 280 static int tcm_vhost_write_pending_status(struct se_cmd *se_cmd)
 281 {
 282         return 0;
 283 }
 284
 285 static void tcm_vhost_set_default_node_attrs(struct se_node_acl *nacl)
 286 {
 287         return;
 288 }
 289
 290 static u32 tcm_vhost_get_task_tag(struct se_cmd *se_cmd)
 291 {
 292         return 0;
 293 }
 294
 295 static int tcm_vhost_get_cmd_state(struct se_cmd *se_cmd)
 296 {
 297         return 0;
 298 }
 299
 300 static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *);
 301
 302 static int tcm_vhost_queue_data_in(struct se_cmd *se_cmd)
 303 {
 304         struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
 305                                 struct tcm_vhost_cmd, tvc_se_cmd);
 306         vhost_scsi_complete_cmd(tv_cmd);
 307         return 0;
 308 }
 309
 310 static int tcm_vhost_queue_status(struct se_cmd *se_cmd)
 311 {
 312         struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
 313                                 struct tcm_vhost_cmd, tvc_se_cmd);
 314         vhost_scsi_complete_cmd(tv_cmd);
 315         return 0;
 316 }
 317
 318 static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
 319 {
 320         return 0;
 321 }
 322
 323 static u16 tcm_vhost_set_fabric_sense_len(struct se_cmd *se_cmd,
 324         u32 sense_length)
 325 {
 326         return 0;
 327 }
 328
 329 static u16 tcm_vhost_get_fabric_sense_len(void)
 330 {
 331         return 0;
 332 }
 333
 334 static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
 335 {
 336         struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
 337
 338         /* TODO locking against target/backend threads? */
 339         transport_generic_free_cmd(se_cmd, 1);
 340
 341         if (tv_cmd->tvc_sgl_count) {
 342                 u32 i;
 343                 for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
 344                         put_page(sg_page(&tv_cmd->tvc_sgl[i]));
 345
 346                 kfree(tv_cmd->tvc_sgl);
 347         }
 348
 349         kfree(tv_cmd);
 350 }
 351
 352 /* Dequeue a command from the completion list */
 353 static struct tcm_vhost_cmd *vhost_scsi_get_cmd_from_completion(
 354         struct vhost_scsi *vs)
 355 {
 356         struct tcm_vhost_cmd *tv_cmd = NULL;
 357
 358         spin_lock_bh(&vs->vs_completion_lock);
 359         if (list_empty(&vs->vs_completion_list)) {
 360                 spin_unlock_bh(&vs->vs_completion_lock);
 361                 return NULL;
 362         }
 363
 364         list_for_each_entry(tv_cmd, &vs->vs_completion_list,
 365                             tvc_completion_list) {
 366                 list_del(&tv_cmd->tvc_completion_list);
 367                 break;
 368         }
 369         spin_unlock_bh(&vs->vs_completion_lock);
 370         return tv_cmd;
 371 }
 372
 373 /* Fill in status and signal that we are done processing this command
 374  *
 375  * This is scheduled in the vhost work queue so we are called with the owner
 376  * process mm and can access the vring.
 377  */
 378 static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
 379 {
 380         struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
 381                                         vs_completion_work);
 382         struct tcm_vhost_cmd *tv_cmd;
 383
 384         while ((tv_cmd = vhost_scsi_get_cmd_from_completion(vs)) != NULL) {
 385                 struct virtio_scsi_cmd_resp v_rsp;
 386                 struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
 387                 int ret;
 388
 389                 pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
 390                         tv_cmd, se_cmd->residual_count, se_cmd->scsi_status);
 391
 392                 memset(&v_rsp, 0, sizeof(v_rsp));
 393                 v_rsp.resid = se_cmd->residual_count;
 394                 /* TODO is status_qualifier field needed? */
 395                 v_rsp.status = se_cmd->scsi_status;
 396                 v_rsp.sense_len = se_cmd->scsi_sense_length;
 397                 memcpy(v_rsp.sense, tv_cmd->tvc_sense_buf,
 398                        v_rsp.sense_len);
 399                 ret = copy_to_user(tv_cmd->tvc_resp, &v_rsp, sizeof(v_rsp));
 400                 if (likely(ret == 0))
 401                         vhost_add_used(&vs->vqs[2], tv_cmd->tvc_vq_desc, 0);
 402                 else
 403                         pr_err("Faulted on virtio_scsi_cmd_resp\n");
 404
 405                 vhost_scsi_free_cmd(tv_cmd);
 406         }
 407
 408         vhost_signal(&vs->dev, &vs->vqs[2]);
 409 }
 410
 411 static void vhost_scsi_complete_cmd(struct tcm_vhost_cmd *tv_cmd)
 412 {
 413         struct vhost_scsi *vs = tv_cmd->tvc_vhost;
 414
 415         pr_debug("%s tv_cmd %p\n", __func__, tv_cmd);
 416
 417         spin_lock_bh(&vs->vs_completion_lock);
 418         list_add_tail(&tv_cmd->tvc_completion_list, &vs->vs_completion_list);
 419         spin_unlock_bh(&vs->vs_completion_lock);
 420
 421         vhost_work_queue(&vs->dev, &vs->vs_completion_work);
 422 }
 423
 424 static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
 425         struct tcm_vhost_tpg *tv_tpg,
 426         struct virtio_scsi_cmd_req *v_req,
 427         u32 exp_data_len,
 428         int data_direction)
 429 {
 430         struct tcm_vhost_cmd *tv_cmd;
 431         struct tcm_vhost_nexus *tv_nexus;
 432         struct se_portal_group *se_tpg = &tv_tpg->se_tpg;
 433         struct se_session *se_sess;
 434         struct se_cmd *se_cmd;
 435         int sam_task_attr;
 436
 437         tv_nexus = tv_tpg->tpg_nexus;
 438         if (!tv_nexus) {
 439                 pr_err("Unable to locate active struct tcm_vhost_nexus\n");
 440                 return ERR_PTR(-EIO);
 441         }
 442         se_sess = tv_nexus->tvn_se_sess;
 443
 444         tv_cmd = kzalloc(sizeof(struct tcm_vhost_cmd), GFP_ATOMIC);
 445         if (!tv_cmd) {
 446                 pr_err("Unable to allocate struct tcm_vhost_cmd\n");
 447                 return ERR_PTR(-ENOMEM);
 448         }
 449         INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
 450         tv_cmd->tvc_tag = v_req->tag;
 451
 452         se_cmd = &tv_cmd->tvc_se_cmd;
 453         /*
 454          * Locate the SAM Task Attr from virtio_scsi_cmd_req
 455          */
 456         sam_task_attr = v_req->task_attr;
 457         /*
 458          * Initialize struct se_cmd descriptor from TCM infrastructure
 459          */
 460         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, exp_data_len,
 461                                 data_direction, sam_task_attr,
 462                                 &tv_cmd->tvc_sense_buf[0]);
 463
 464 #if 0   /* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
 465         if (bidi)
 466                 se_cmd->se_cmd_flags |= SCF_BIDI;
 467 #endif
 468         return tv_cmd;
 469 }
 470
 471 /*
 472  * Map a user memory range into a scatterlist
 473  *
 474  * Returns the number of scatterlist entries used or -errno on error.
 475  */
 476 static int vhost_scsi_map_to_sgl(struct scatterlist *sgl,
 477         unsigned int sgl_count, void __user *ptr, size_t len, int write)
 478 {
 479         struct scatterlist *sg = sgl;
 480         unsigned int npages = 0;
 481         int ret;
 482
 483         while (len > 0) {
 484                 struct page *page;
 485                 unsigned int offset = (uintptr_t)ptr & ~PAGE_MASK;
 486                 unsigned int nbytes = min_t(unsigned int,
 487                                 PAGE_SIZE - offset, len);
 488
 489                 if (npages == sgl_count) {
 490                         ret = -ENOBUFS;
 491                         goto err;
 492                 }
 493
 494                 ret = get_user_pages_fast((unsigned long)ptr, 1, write, &page);
 495                 BUG_ON(ret == 0); /* we should either get our page or fail */
 496                 if (ret < 0)
 497                         goto err;
 498
 499                 sg_set_page(sg, page, nbytes, offset);
 500                 ptr += nbytes;
 501                 len -= nbytes;
 502                 sg++;
 503                 npages++;
 504         }
 505         return npages;
 506
 507 err:
 508         /* Put pages that we hold */
 509         for (sg = sgl; sg != &sgl[npages]; sg++)
 510                 put_page(sg_page(sg));
 511         return ret;
 512 }
 513
 514 static int vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *tv_cmd,
 515         struct iovec *iov, unsigned int niov, int write)
 516 {
 517         int ret;
 518         unsigned int i;
 519         u32 sgl_count;
 520         struct scatterlist *sg;
 521
 522         /*
 523          * Find out how long sglist needs to be
 524          */
 525         sgl_count = 0;
 526         for (i = 0; i < niov; i++) {
 527                 sgl_count += (((uintptr_t)iov[i].iov_base + iov[i].iov_len +
 528                                 PAGE_SIZE - 1) >> PAGE_SHIFT) -
 529                                 ((uintptr_t)iov[i].iov_base >> PAGE_SHIFT);
 530         }
 531         /* TODO overflow checking */
 532
 533         sg = kmalloc(sizeof(tv_cmd->tvc_sgl[0]) * sgl_count, GFP_ATOMIC);
 534         if (!sg)
 535                 return -ENOMEM;
 536         pr_debug("%s sg %p sgl_count %u is_err %ld\n", __func__,
 537                sg, sgl_count, IS_ERR(sg));
 538         sg_init_table(sg, sgl_count);
 539
 540         tv_cmd->tvc_sgl = sg;
 541         tv_cmd->tvc_sgl_count = sgl_count;
 542
 543         pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
 544         for (i = 0; i < niov; i++) {
 545                 ret = vhost_scsi_map_to_sgl(sg, sgl_count, iov[i].iov_base,
 546                                         iov[i].iov_len, write);
 547                 if (ret < 0) {
 548                         for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
 549                                 put_page(sg_page(&tv_cmd->tvc_sgl[i]));
 550                         kfree(tv_cmd->tvc_sgl);
 551                         tv_cmd->tvc_sgl = NULL;
 552                         tv_cmd->tvc_sgl_count = 0;
 553                         return ret;
 554                 }
 555
 556                 sg += ret;
 557                 sgl_count -= ret;
 558         }
 559         return 0;
 560 }
 561
 562 static void tcm_vhost_submission_work(struct work_struct *work)
 563 {
 564         struct tcm_vhost_cmd *tv_cmd =
 565                 container_of(work, struct tcm_vhost_cmd, work);
 566         struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
 567         struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
 568         int rc, sg_no_bidi = 0;
 569         /*
 570          * Locate the struct se_lun pointer based on v_req->lun, and
 571          * attach it to struct se_cmd
 572          */
 573         rc = transport_lookup_cmd_lun(&tv_cmd->tvc_se_cmd, tv_cmd->tvc_lun);
 574         if (rc < 0) {
 575                 pr_err("Failed to look up lun: %d\n", tv_cmd->tvc_lun);
 576                 transport_send_check_condition_and_sense(&tv_cmd->tvc_se_cmd,
 577                         tv_cmd->tvc_se_cmd.scsi_sense_reason, 0);
 578                 transport_generic_free_cmd(se_cmd, 0);
 579                 return;
 580         }
 581
 582         rc = target_setup_cmd_from_cdb(se_cmd, tv_cmd->tvc_cdb);
 583         if (rc == -ENOMEM) {
 584                 transport_send_check_condition_and_sense(se_cmd,
 585                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 586                 transport_generic_free_cmd(se_cmd, 0);
 587                 return;
 588         } else if (rc < 0) {
 589                 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
 590                         tcm_vhost_queue_status(se_cmd);
 591                 else
 592                         transport_send_check_condition_and_sense(se_cmd,
 593                                         se_cmd->scsi_sense_reason, 0);
 594                 transport_generic_free_cmd(se_cmd, 0);
 595                 return;
 596         }
 597
 598         if (tv_cmd->tvc_sgl_count) {
 599                 sg_ptr = tv_cmd->tvc_sgl;
 600                 /*
 601                  * For BIDI commands, pass in the extra READ buffer
 602                  * to transport_generic_map_mem_to_cmd() below..
 603                  */
 604 /* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
 605 #if 0
 606                 if (se_cmd->se_cmd_flags & SCF_BIDI) {
 607                         sg_bidi_ptr = NULL;
 608                         sg_no_bidi = 0;
 609                 }
 610 #endif
 611         } else {
 612                 sg_ptr = NULL;
 613         }
 614
 615         rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
 616                                 tv_cmd->tvc_sgl_count, sg_bidi_ptr,
 617                                 sg_no_bidi);
 618         if (rc < 0) {
 619                 transport_send_check_condition_and_sense(se_cmd,
 620                                 se_cmd->scsi_sense_reason, 0);
 621                 transport_generic_free_cmd(se_cmd, 0);
 622                 return;
 623         }
 624         transport_handle_cdb_direct(se_cmd);
 625 }
 626
 627 static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
 628 {
 629         struct vhost_virtqueue *vq = &vs->vqs[2];
 630         struct virtio_scsi_cmd_req v_req;
 631         struct tcm_vhost_tpg *tv_tpg;
 632         struct tcm_vhost_cmd *tv_cmd;
 633         u32 exp_data_len, data_first, data_num, data_direction;
 634         unsigned out, in, i;
 635         int head, ret;
 636
 637         /* Must use ioctl VHOST_SCSI_SET_ENDPOINT */
 638         tv_tpg = vs->vs_tpg;
 639         if (unlikely(!tv_tpg)) {
 640                 pr_err("%s endpoint not set\n", __func__);
 641                 return;
 642         }
 643
 644         mutex_lock(&vq->mutex);
 645         vhost_disable_notify(&vs->dev, vq);
 646
 647         for (;;) {
 648                 head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
 649                                         ARRAY_SIZE(vq->iov), &out, &in,
 650                                         NULL, NULL);
 651                 pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
 652                                         head, out, in);
 653                 /* On error, stop handling until the next kick. */
 654                 if (unlikely(head < 0))
 655                         break;
 656                 /* Nothing new?  Wait for eventfd to tell us they refilled. */
 657                 if (head == vq->num) {
 658                         if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
 659                                 vhost_disable_notify(&vs->dev, vq);
 660                                 continue;
 661                         }
 662                         break;
 663                 }
 664
 665 /* FIXME: BIDI operation */
 666                 if (out == 1 && in == 1) {
 667                         data_direction = DMA_NONE;
 668                         data_first = 0;
 669                         data_num = 0;
 670                 } else if (out == 1 && in > 1) {
 671                         data_direction = DMA_FROM_DEVICE;
 672                         data_first = out + 1;
 673                         data_num = in - 1;
 674                 } else if (out > 1 && in == 1) {
 675                         data_direction = DMA_TO_DEVICE;
 676                         data_first = 1;
 677                         data_num = out - 1;
 678                 } else {
 679                         vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
 680                                         out, in);
 681                         break;
 682                 }
 683
 684                 /*
 685                  * Check for a sane resp buffer so we can report errors to
 686                  * the guest.
 687                  */
 688                 if (unlikely(vq->iov[out].iov_len !=
 689                                         sizeof(struct virtio_scsi_cmd_resp))) {
 690                         vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
 691                                 " bytes\n", vq->iov[out].iov_len);
 692                         break;
 693                 }
 694
 695                 if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
 696                         vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
 697                                 " bytes\n", vq->iov[0].iov_len);
 698                         break;
 699                 }
 700                 pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
 701                         " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
 702                 ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
 703                                 sizeof(v_req));
 704                 if (unlikely(ret)) {
 705                         vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
 706                         break;
 707                 }
 708
 709                 exp_data_len = 0;
 710                 for (i = 0; i < data_num; i++)
 711                         exp_data_len += vq->iov[data_first + i].iov_len;
 712
 713                 tv_cmd = vhost_scsi_allocate_cmd(tv_tpg, &v_req,
 714                                         exp_data_len, data_direction);
 715                 if (IS_ERR(tv_cmd)) {
 716                         vq_err(vq, "vhost_scsi_allocate_cmd failed %ld\n",
 717                                         PTR_ERR(tv_cmd));
 718                         break;
 719                 }
 720                 pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
 721                         ": %d\n", tv_cmd, exp_data_len, data_direction);
 722
 723                 tv_cmd->tvc_vhost = vs;
 724
 725                 if (unlikely(vq->iov[out].iov_len !=
 726                                 sizeof(struct virtio_scsi_cmd_resp))) {
 727                         vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
 728                                 " bytes, out: %d, in: %d\n",
 729                                 vq->iov[out].iov_len, out, in);
 730                         break;
 731                 }
 732
 733                 tv_cmd->tvc_resp = vq->iov[out].iov_base;
 734
 735                 /*
 736                  * Copy in the recieved CDB descriptor into tv_cmd->tvc_cdb
 737                  * that will be used by tcm_vhost_new_cmd_map() and down into
 738                  * target_setup_cmd_from_cdb()
 739                  */
 740                 memcpy(tv_cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
 741                 /*
 742                  * Check that the recieved CDB size does not exceeded our
 743                  * hardcoded max for tcm_vhost
 744                  */
 745                 /* TODO what if cdb was too small for varlen cdb header? */
 746                 if (unlikely(scsi_command_size(tv_cmd->tvc_cdb) >
 747                                         TCM_VHOST_MAX_CDB_SIZE)) {
 748                         vq_err(vq, "Received SCSI CDB with command_size: %d that"
 749                                 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
 750                                 scsi_command_size(tv_cmd->tvc_cdb),
 751                                 TCM_VHOST_MAX_CDB_SIZE);
 752                         break; /* TODO */
 753                 }
 754                 tv_cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
 755
 756                 pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
 757                         tv_cmd->tvc_cdb[0], tv_cmd->tvc_lun);
 758
 759                 if (data_direction != DMA_NONE) {
 760                         ret = vhost_scsi_map_iov_to_sgl(tv_cmd,
 761                                         &vq->iov[data_first], data_num,
 762                                         data_direction == DMA_TO_DEVICE);
 763                         if (unlikely(ret)) {
 764                                 vq_err(vq, "Failed to map iov to sgl\n");
 765                                 break; /* TODO */
 766                         }
 767                 }
 768
 769                 /*
 770                  * Save the descriptor from vhost_get_vq_desc() to be used to
 771                  * complete the virtio-scsi request in TCM callback context via
 772                  * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
 773                  */
 774                 tv_cmd->tvc_vq_desc = head;
 775                 /*
 776                  * Dispatch tv_cmd descriptor for cmwq execution in process
 777                  * context provided by tcm_vhost_workqueue.  This also ensures
 778                  * tv_cmd is executed on the same kworker CPU as this vhost
 779                  * thread to gain positive L2 cache locality effects..
 780                  */
 781                 INIT_WORK(&tv_cmd->work, tcm_vhost_submission_work);
 782                 queue_work(tcm_vhost_workqueue, &tv_cmd->work);
 783         }
 784
 785         mutex_unlock(&vq->mutex);
 786 }
 787
 788 static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
 789 {
 790         pr_err("%s: The handling func for control queue.\n", __func__);
 791 }
 792
 793 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
 794 {
 795         pr_err("%s: The handling func for event queue.\n", __func__);
 796 }
 797
 798 static void vhost_scsi_handle_kick(struct vhost_work *work)
 799 {
 800         struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
 801                                                 poll.work);
 802         struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
 803
 804         vhost_scsi_handle_vq(vs);
 805 }
 806
 807 /*
 808  * Called from vhost_scsi_ioctl() context to walk the list of available
 809  * tcm_vhost_tpg with an active struct tcm_vhost_nexus
 810  */
 811 static int vhost_scsi_set_endpoint(
 812         struct vhost_scsi *vs,
 813         struct vhost_scsi_target *t)
 814 {
 815         struct tcm_vhost_tport *tv_tport;
 816         struct tcm_vhost_tpg *tv_tpg;
 817         int index;
 818
 819         mutex_lock(&vs->dev.mutex);
 820         /* Verify that ring has been setup correctly. */
 821         for (index = 0; index < vs->dev.nvqs; ++index) {
 822                 /* Verify that ring has been setup correctly. */
 823                 if (!vhost_vq_access_ok(&vs->vqs[index])) {
 824                         mutex_unlock(&vs->dev.mutex);
 825                         return -EFAULT;
 826                 }
 827         }
 828
 829         if (vs->vs_tpg) {
 830                 mutex_unlock(&vs->dev.mutex);
 831                 return -EEXIST;
 832         }
 833         mutex_unlock(&vs->dev.mutex);
 834
 835         mutex_lock(&tcm_vhost_mutex);
 836         list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
 837                 mutex_lock(&tv_tpg->tv_tpg_mutex);
 838                 if (!tv_tpg->tpg_nexus) {
 839                         mutex_unlock(&tv_tpg->tv_tpg_mutex);
 840                         continue;
 841                 }
 842                 if (atomic_read(&tv_tpg->tv_tpg_vhost_count)) {
 843                         mutex_unlock(&tv_tpg->tv_tpg_mutex);
 844                         continue;
 845                 }
 846                 tv_tport = tv_tpg->tport;
 847
 848                 if (!strcmp(tv_tport->tport_name, t->vhost_wwpn) &&
 849                     (tv_tpg->tport_tpgt == t->vhost_tpgt)) {
 850                         atomic_inc(&tv_tpg->tv_tpg_vhost_count);
 851                         smp_mb__after_atomic_inc();
 852                         mutex_unlock(&tv_tpg->tv_tpg_mutex);
 853                         mutex_unlock(&tcm_vhost_mutex);
 854
 855                         mutex_lock(&vs->dev.mutex);
 856                         vs->vs_tpg = tv_tpg;
 857                         atomic_inc(&vs->vhost_ref_cnt);
 858                         smp_mb__after_atomic_inc();
 859                         mutex_unlock(&vs->dev.mutex);
 860                         return 0;
 861                 }
 862                 mutex_unlock(&tv_tpg->tv_tpg_mutex);
 863         }
 864         mutex_unlock(&tcm_vhost_mutex);
 865         return -EINVAL;
 866 }
 867
 868 static int vhost_scsi_clear_endpoint(
 869         struct vhost_scsi *vs,
 870         struct vhost_scsi_target *t)
 871 {
 872         struct tcm_vhost_tport *tv_tport;
 873         struct tcm_vhost_tpg *tv_tpg;
 874         int index;
 875
 876         mutex_lock(&vs->dev.mutex);
 877         /* Verify that ring has been setup correctly. */
 878         for (index = 0; index < vs->dev.nvqs; ++index) {
 879                 if (!vhost_vq_access_ok(&vs->vqs[index])) {
 880                         mutex_unlock(&vs->dev.mutex);
 881                         return -EFAULT;
 882                 }
 883         }
 884
 885         if (!vs->vs_tpg) {
 886                 mutex_unlock(&vs->dev.mutex);
 887                 return -ENODEV;
 888         }
 889         tv_tpg = vs->vs_tpg;
 890         tv_tport = tv_tpg->tport;
 891
 892         if (strcmp(tv_tport->tport_name, t->vhost_wwpn) ||
 893             (tv_tpg->tport_tpgt != t->vhost_tpgt)) {
 894                 mutex_unlock(&vs->dev.mutex);
 895                 pr_warn("tv_tport->tport_name: %s, tv_tpg->tport_tpgt: %hu"
 896                         " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
 897                         tv_tport->tport_name, tv_tpg->tport_tpgt,
 898                         t->vhost_wwpn, t->vhost_tpgt);
 899                 return -EINVAL;
 900         }
 901         atomic_dec(&tv_tpg->tv_tpg_vhost_count);
 902         vs->vs_tpg = NULL;
 903         mutex_unlock(&vs->dev.mutex);
 904
 905         return 0;
 906 }
 907
 908 static int vhost_scsi_open(struct inode *inode, struct file *f)
 909 {
 910         struct vhost_scsi *s;
 911         int r;
 912
 913         s = kzalloc(sizeof(*s), GFP_KERNEL);
 914         if (!s)
 915                 return -ENOMEM;
 916
 917         vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
 918         INIT_LIST_HEAD(&s->vs_completion_list);
 919         spin_lock_init(&s->vs_completion_lock);
 920
 921         s->vqs[0].handle_kick = vhost_scsi_ctl_handle_kick;
 922         s->vqs[1].handle_kick = vhost_scsi_evt_handle_kick;
 923         s->vqs[2].handle_kick = vhost_scsi_handle_kick;
 924         r = vhost_dev_init(&s->dev, s->vqs, 3);
 925         if (r < 0) {
 926                 kfree(s);
 927                 return r;
 928         }
 929
 930         f->private_data = s;
 931         return 0;
 932 }
 933
 934 static int vhost_scsi_release(struct inode *inode, struct file *f)
 935 {
 936         struct vhost_scsi *s = f->private_data;
 937
 938         if (s->vs_tpg && s->vs_tpg->tport) {
 939                 struct vhost_scsi_target backend;
 940
 941                 memcpy(backend.vhost_wwpn, s->vs_tpg->tport->tport_name,
 942                                 sizeof(backend.vhost_wwpn));
 943                 backend.vhost_tpgt = s->vs_tpg->tport_tpgt;
 944                 vhost_scsi_clear_endpoint(s, &backend);
 945         }
 946
 947         vhost_dev_cleanup(&s->dev, false);
 948         kfree(s);
 949         return 0;
 950 }
 951
 952 static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
 953 {
 954         if (features & ~VHOST_FEATURES)
 955                 return -EOPNOTSUPP;
 956
 957         mutex_lock(&vs->dev.mutex);
 958         if ((features & (1 << VHOST_F_LOG_ALL)) &&
 959             !vhost_log_access_ok(&vs->dev)) {
 960                 mutex_unlock(&vs->dev.mutex);
 961                 return -EFAULT;
 962         }
 963         vs->dev.acked_features = features;
 964         /* TODO possibly smp_wmb() and flush vqs */
 965         mutex_unlock(&vs->dev.mutex);
 966         return 0;
 967 }
 968
 969 static long vhost_scsi_ioctl(struct file *f, unsigned int ioctl,
 970                                 unsigned long arg)
 971 {
 972         struct vhost_scsi *vs = f->private_data;
 973         struct vhost_scsi_target backend;
 974         void __user *argp = (void __user *)arg;
 975         u64 __user *featurep = argp;
 976         u64 features;
 977         int r;
 978
 979         switch (ioctl) {
 980         case VHOST_SCSI_SET_ENDPOINT:
 981                 if (copy_from_user(&backend, argp, sizeof backend))
 982                         return -EFAULT;
 983
 984                 return vhost_scsi_set_endpoint(vs, &backend);
 985         case VHOST_SCSI_CLEAR_ENDPOINT:
 986                 if (copy_from_user(&backend, argp, sizeof backend))
 987                         return -EFAULT;
 988
 989                 return vhost_scsi_clear_endpoint(vs, &backend);
 990         case VHOST_SCSI_GET_ABI_VERSION:
 991                 if (copy_from_user(&backend, argp, sizeof backend))
 992                         return -EFAULT;
 993
 994                 backend.abi_version = VHOST_SCSI_ABI_VERSION;
 995
 996                 if (copy_to_user(argp, &backend, sizeof backend))
 997                         return -EFAULT;
 998                 return 0;
 999         case VHOST_GET_FEATURES:
1000                 features = VHOST_FEATURES;
1001                 if (copy_to_user(featurep, &features, sizeof features))
1002                         return -EFAULT;
1003                 return 0;
1004         case VHOST_SET_FEATURES:
1005                 if (copy_from_user(&features, featurep, sizeof features))
1006                         return -EFAULT;
1007                 return vhost_scsi_set_features(vs, features);
1008         default:
1009                 mutex_lock(&vs->dev.mutex);
1010                 r = vhost_dev_ioctl(&vs->dev, ioctl, arg);
1011                 mutex_unlock(&vs->dev.mutex);
1012                 return r;
1013         }
1014 }
1015
1016 static const struct file_operations vhost_scsi_fops = {
1017         .owner          = THIS_MODULE,
1018         .release        = vhost_scsi_release,
1019         .unlocked_ioctl = vhost_scsi_ioctl,
1020         /* TODO compat ioctl? */
1021         .open           = vhost_scsi_open,
1022         .llseek         = noop_llseek,
1023 };
1024
1025 static struct miscdevice vhost_scsi_misc = {
1026         MISC_DYNAMIC_MINOR,
1027         "vhost-scsi",
1028         &vhost_scsi_fops,
1029 };
1030
1031 static int __init vhost_scsi_register(void)
1032 {
1033         return misc_register(&vhost_scsi_misc);
1034 }
1035
1036 static int vhost_scsi_deregister(void)
1037 {
1038         return misc_deregister(&vhost_scsi_misc);
1039 }
1040
1041 static char *tcm_vhost_dump_proto_id(struct tcm_vhost_tport *tport)
1042 {
1043         switch (tport->tport_proto_id) {
1044         case SCSI_PROTOCOL_SAS:
1045                 return "SAS";
1046         case SCSI_PROTOCOL_FCP:
1047                 return "FCP";
1048         case SCSI_PROTOCOL_ISCSI:
1049                 return "iSCSI";
1050         default:
1051                 break;
1052         }
1053
1054         return "Unknown";
1055 }
1056
1057 static int tcm_vhost_port_link(
1058         struct se_portal_group *se_tpg,
1059         struct se_lun *lun)
1060 {
1061         struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1062                                 struct tcm_vhost_tpg, se_tpg);
1063
1064         atomic_inc(&tv_tpg->tv_tpg_port_count);
1065         smp_mb__after_atomic_inc();
1066
1067         return 0;
1068 }
1069
1070 static void tcm_vhost_port_unlink(
1071         struct se_portal_group *se_tpg,
1072         struct se_lun *se_lun)
1073 {
1074         struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1075                                 struct tcm_vhost_tpg, se_tpg);
1076
1077         atomic_dec(&tv_tpg->tv_tpg_port_count);
1078         smp_mb__after_atomic_dec();
1079 }
1080
1081 static struct se_node_acl *tcm_vhost_make_nodeacl(
1082         struct se_portal_group *se_tpg,
1083         struct config_group *group,
1084         const char *name)
1085 {
1086         struct se_node_acl *se_nacl, *se_nacl_new;
1087         struct tcm_vhost_nacl *nacl;
1088         u64 wwpn = 0;
1089         u32 nexus_depth;
1090
1091         /* tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1092                 return ERR_PTR(-EINVAL); */
1093         se_nacl_new = tcm_vhost_alloc_fabric_acl(se_tpg);
1094         if (!se_nacl_new)
1095                 return ERR_PTR(-ENOMEM);
1096
1097         nexus_depth = 1;
1098         /*
1099          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1100          * when converting a NodeACL from demo mode -> explict
1101          */
1102         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1103                                 name, nexus_depth);
1104         if (IS_ERR(se_nacl)) {
1105                 tcm_vhost_release_fabric_acl(se_tpg, se_nacl_new);
1106                 return se_nacl;
1107         }
1108         /*
1109          * Locate our struct tcm_vhost_nacl and set the FC Nport WWPN
1110          */
1111         nacl = container_of(se_nacl, struct tcm_vhost_nacl, se_node_acl);
1112         nacl->iport_wwpn = wwpn;
1113
1114         return se_nacl;
1115 }
1116
1117 static void tcm_vhost_drop_nodeacl(struct se_node_acl *se_acl)
1118 {
1119         struct tcm_vhost_nacl *nacl = container_of(se_acl,
1120                                 struct tcm_vhost_nacl, se_node_acl);
1121         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1122         kfree(nacl);
1123 }
1124
1125 static int tcm_vhost_make_nexus(
1126         struct tcm_vhost_tpg *tv_tpg,
1127         const char *name)
1128 {
1129         struct se_portal_group *se_tpg;
1130         struct tcm_vhost_nexus *tv_nexus;
1131
1132         mutex_lock(&tv_tpg->tv_tpg_mutex);
1133         if (tv_tpg->tpg_nexus) {
1134                 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1135                 pr_debug("tv_tpg->tpg_nexus already exists\n");
1136                 return -EEXIST;
1137         }
1138         se_tpg = &tv_tpg->se_tpg;
1139
1140         tv_nexus = kzalloc(sizeof(struct tcm_vhost_nexus), GFP_KERNEL);
1141         if (!tv_nexus) {
1142                 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1143                 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1144                 return -ENOMEM;
1145         }
1146         /*
1147          *  Initialize the struct se_session pointer
1148          */
1149         tv_nexus->tvn_se_sess = transport_init_session();
1150         if (IS_ERR(tv_nexus->tvn_se_sess)) {
1151                 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1152                 kfree(tv_nexus);
1153                 return -ENOMEM;
1154         }
1155         /*
1156          * Since we are running in 'demo mode' this call with generate a
1157          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1158          * the SCSI Initiator port name of the passed configfs group 'name'.
1159          */
1160         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1161                                 se_tpg, (unsigned char *)name);
1162         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1163                 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1164                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1165                                 " for %s\n", name);
1166                 transport_free_session(tv_nexus->tvn_se_sess);
1167                 kfree(tv_nexus);
1168                 return -ENOMEM;
1169         }
1170         /*
1171          * Now register the TCM vHost virtual I_T Nexus as active with the
1172          * call to __transport_register_session()
1173          */
1174         __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1175                         tv_nexus->tvn_se_sess, tv_nexus);
1176         tv_tpg->tpg_nexus = tv_nexus;
1177
1178         mutex_unlock(&tv_tpg->tv_tpg_mutex);
1179         return 0;
1180 }
1181
1182 static int tcm_vhost_drop_nexus(
1183         struct tcm_vhost_tpg *tpg)
1184 {
1185         struct se_session *se_sess;
1186         struct tcm_vhost_nexus *tv_nexus;
1187
1188         mutex_lock(&tpg->tv_tpg_mutex);
1189         tv_nexus = tpg->tpg_nexus;
1190         if (!tv_nexus) {
1191                 mutex_unlock(&tpg->tv_tpg_mutex);
1192                 return -ENODEV;
1193         }
1194
1195         se_sess = tv_nexus->tvn_se_sess;
1196         if (!se_sess) {
1197                 mutex_unlock(&tpg->tv_tpg_mutex);
1198                 return -ENODEV;
1199         }
1200
1201         if (atomic_read(&tpg->tv_tpg_port_count)) {
1202                 mutex_unlock(&tpg->tv_tpg_mutex);
1203                 pr_err("Unable to remove TCM_vHost I_T Nexus with"
1204                         " active TPG port count: %d\n",
1205                         atomic_read(&tpg->tv_tpg_port_count));
1206                 return -EPERM;
1207         }
1208
1209         if (atomic_read(&tpg->tv_tpg_vhost_count)) {
1210                 mutex_unlock(&tpg->tv_tpg_mutex);
1211                 pr_err("Unable to remove TCM_vHost I_T Nexus with"
1212                         " active TPG vhost count: %d\n",
1213                         atomic_read(&tpg->tv_tpg_vhost_count));
1214                 return -EPERM;
1215         }
1216
1217         pr_debug("TCM_vHost_ConfigFS: Removing I_T Nexus to emulated"
1218                 " %s Initiator Port: %s\n", tcm_vhost_dump_proto_id(tpg->tport),
1219                 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1220         /*
1221          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1222          */
1223         transport_deregister_session(tv_nexus->tvn_se_sess);
1224         tpg->tpg_nexus = NULL;
1225         mutex_unlock(&tpg->tv_tpg_mutex);
1226
1227         kfree(tv_nexus);
1228         return 0;
1229 }
1230
1231 static ssize_t tcm_vhost_tpg_show_nexus(
1232         struct se_portal_group *se_tpg,
1233         char *page)
1234 {
1235         struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1236                                 struct tcm_vhost_tpg, se_tpg);
1237         struct tcm_vhost_nexus *tv_nexus;
1238         ssize_t ret;
1239
1240         mutex_lock(&tv_tpg->tv_tpg_mutex);
1241         tv_nexus = tv_tpg->tpg_nexus;
1242         if (!tv_nexus) {
1243                 mutex_unlock(&tv_tpg->tv_tpg_mutex);
1244                 return -ENODEV;
1245         }
1246         ret = snprintf(page, PAGE_SIZE, "%s\n",
1247                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1248         mutex_unlock(&tv_tpg->tv_tpg_mutex);
1249
1250         return ret;
1251 }
1252
1253 static ssize_t tcm_vhost_tpg_store_nexus(
1254         struct se_portal_group *se_tpg,
1255         const char *page,
1256         size_t count)
1257 {
1258         struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
1259                                 struct tcm_vhost_tpg, se_tpg);
1260         struct tcm_vhost_tport *tport_wwn = tv_tpg->tport;
1261         unsigned char i_port[TCM_VHOST_NAMELEN], *ptr, *port_ptr;
1262         int ret;
1263         /*
1264          * Shutdown the active I_T nexus if 'NULL' is passed..
1265          */
1266         if (!strncmp(page, "NULL", 4)) {
1267                 ret = tcm_vhost_drop_nexus(tv_tpg);
1268                 return (!ret) ? count : ret;
1269         }
1270         /*
1271          * Otherwise make sure the passed virtual Initiator port WWN matches
1272          * the fabric protocol_id set in tcm_vhost_make_tport(), and call
1273          * tcm_vhost_make_nexus().
1274          */
1275         if (strlen(page) >= TCM_VHOST_NAMELEN) {
1276                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1277                                 " max: %d\n", page, TCM_VHOST_NAMELEN);
1278                 return -EINVAL;
1279         }
1280         snprintf(&i_port[0], TCM_VHOST_NAMELEN, "%s", page);
1281
1282         ptr = strstr(i_port, "naa.");
1283         if (ptr) {
1284                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1285                         pr_err("Passed SAS Initiator Port %s does not"
1286                                 " match target port protoid: %s\n", i_port,
1287                                 tcm_vhost_dump_proto_id(tport_wwn));
1288                         return -EINVAL;
1289                 }
1290                 port_ptr = &i_port[0];
1291                 goto check_newline;
1292         }
1293         ptr = strstr(i_port, "fc.");
1294         if (ptr) {
1295                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1296                         pr_err("Passed FCP Initiator Port %s does not"
1297                                 " match target port protoid: %s\n", i_port,
1298                                 tcm_vhost_dump_proto_id(tport_wwn));
1299                         return -EINVAL;
1300                 }
1301                 port_ptr = &i_port[3]; /* Skip over "fc." */
1302                 goto check_newline;
1303         }
1304         ptr = strstr(i_port, "iqn.");
1305         if (ptr) {
1306                 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1307                         pr_err("Passed iSCSI Initiator Port %s does not"
1308                                 " match target port protoid: %s\n", i_port,
1309                                 tcm_vhost_dump_proto_id(tport_wwn));
1310                         return -EINVAL;
1311                 }
1312                 port_ptr = &i_port[0];
1313                 goto check_newline;
1314         }
1315         pr_err("Unable to locate prefix for emulated Initiator Port:"
1316                         " %s\n", i_port);
1317         return -EINVAL;
1318         /*
1319          * Clear any trailing newline for the NAA WWN
1320          */
1321 check_newline:
1322         if (i_port[strlen(i_port)-1] == '\n')
1323                 i_port[strlen(i_port)-1] = '\0';
1324
1325         ret = tcm_vhost_make_nexus(tv_tpg, port_ptr);
1326         if (ret < 0)
1327                 return ret;
1328
1329         return count;
1330 }
1331
1332 TF_TPG_BASE_ATTR(tcm_vhost, nexus, S_IRUGO | S_IWUSR);
1333
1334 static struct configfs_attribute *tcm_vhost_tpg_attrs[] = {
1335         &tcm_vhost_tpg_nexus.attr,
1336         NULL,
1337 };
1338
1339 static struct se_portal_group *tcm_vhost_make_tpg(
1340         struct se_wwn *wwn,
1341         struct config_group *group,
1342         const char *name)
1343 {
1344         struct tcm_vhost_tport *tport = container_of(wwn,
1345                         struct tcm_vhost_tport, tport_wwn);
1346
1347         struct tcm_vhost_tpg *tpg;
1348         unsigned long tpgt;
1349         int ret;
1350
1351         if (strstr(name, "tpgt_") != name)
1352                 return ERR_PTR(-EINVAL);
1353         if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1354                 return ERR_PTR(-EINVAL);
1355
1356         tpg = kzalloc(sizeof(struct tcm_vhost_tpg), GFP_KERNEL);
1357         if (!tpg) {
1358                 pr_err("Unable to allocate struct tcm_vhost_tpg");
1359                 return ERR_PTR(-ENOMEM);
1360         }
1361         mutex_init(&tpg->tv_tpg_mutex);
1362         INIT_LIST_HEAD(&tpg->tv_tpg_list);
1363         tpg->tport = tport;
1364         tpg->tport_tpgt = tpgt;
1365
1366         ret = core_tpg_register(&tcm_vhost_fabric_configfs->tf_ops, wwn,
1367                                 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1368         if (ret < 0) {
1369                 kfree(tpg);
1370                 return NULL;
1371         }
1372         mutex_lock(&tcm_vhost_mutex);
1373         list_add_tail(&tpg->tv_tpg_list, &tcm_vhost_list);
1374         mutex_unlock(&tcm_vhost_mutex);
1375
1376         return &tpg->se_tpg;
1377 }
1378
1379 static void tcm_vhost_drop_tpg(struct se_portal_group *se_tpg)
1380 {
1381         struct tcm_vhost_tpg *tpg = container_of(se_tpg,
1382                                 struct tcm_vhost_tpg, se_tpg);
1383
1384         mutex_lock(&tcm_vhost_mutex);
1385         list_del(&tpg->tv_tpg_list);
1386         mutex_unlock(&tcm_vhost_mutex);
1387         /*
1388          * Release the virtual I_T Nexus for this vHost TPG
1389          */
1390         tcm_vhost_drop_nexus(tpg);
1391         /*
1392          * Deregister the se_tpg from TCM..
1393          */
1394         core_tpg_deregister(se_tpg);
1395         kfree(tpg);
1396 }
1397
1398 static struct se_wwn *tcm_vhost_make_tport(
1399         struct target_fabric_configfs *tf,
1400         struct config_group *group,
1401         const char *name)
1402 {
1403         struct tcm_vhost_tport *tport;
1404         char *ptr;
1405         u64 wwpn = 0;
1406         int off = 0;
1407
1408         /* if (tcm_vhost_parse_wwn(name, &wwpn, 1) < 0)
1409                 return ERR_PTR(-EINVAL); */
1410
1411         tport = kzalloc(sizeof(struct tcm_vhost_tport), GFP_KERNEL);
1412         if (!tport) {
1413                 pr_err("Unable to allocate struct tcm_vhost_tport");
1414                 return ERR_PTR(-ENOMEM);
1415         }
1416         tport->tport_wwpn = wwpn;
1417         /*
1418          * Determine the emulated Protocol Identifier and Target Port Name
1419          * based on the incoming configfs directory name.
1420          */
1421         ptr = strstr(name, "naa.");
1422         if (ptr) {
1423                 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1424                 goto check_len;
1425         }
1426         ptr = strstr(name, "fc.");
1427         if (ptr) {
1428                 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1429                 off = 3; /* Skip over "fc." */
1430                 goto check_len;
1431         }
1432         ptr = strstr(name, "iqn.");
1433         if (ptr) {
1434                 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1435                 goto check_len;
1436         }
1437
1438         pr_err("Unable to locate prefix for emulated Target Port:"
1439                         " %s\n", name);
1440         kfree(tport);
1441         return ERR_PTR(-EINVAL);
1442
1443 check_len:
1444         if (strlen(name) >= TCM_VHOST_NAMELEN) {
1445                 pr_err("Emulated %s Address: %s, exceeds"
1446                         " max: %d\n", name, tcm_vhost_dump_proto_id(tport),
1447                         TCM_VHOST_NAMELEN);
1448                 kfree(tport);
1449                 return ERR_PTR(-EINVAL);
1450         }
1451         snprintf(&tport->tport_name[0], TCM_VHOST_NAMELEN, "%s", &name[off]);
1452
1453         pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
1454                 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport), name);
1455
1456         return &tport->tport_wwn;
1457 }
1458
1459 static void tcm_vhost_drop_tport(struct se_wwn *wwn)
1460 {
1461         struct tcm_vhost_tport *tport = container_of(wwn,
1462                                 struct tcm_vhost_tport, tport_wwn);
1463
1464         pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
1465                 " %s Address: %s\n", tcm_vhost_dump_proto_id(tport),
1466                 tport->tport_name);
1467
1468         kfree(tport);
1469 }
1470
1471 static ssize_t tcm_vhost_wwn_show_attr_version(
1472         struct target_fabric_configfs *tf,
1473         char *page)
1474 {
1475         return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
1476                 "on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1477                 utsname()->machine);
1478 }
1479
1480 TF_WWN_ATTR_RO(tcm_vhost, version);
1481
1482 static struct configfs_attribute *tcm_vhost_wwn_attrs[] = {
1483         &tcm_vhost_wwn_version.attr,
1484         NULL,
1485 };
1486
1487 static struct target_core_fabric_ops tcm_vhost_ops = {
1488         .get_fabric_name                = tcm_vhost_get_fabric_name,
1489         .get_fabric_proto_ident         = tcm_vhost_get_fabric_proto_ident,
1490         .tpg_get_wwn                    = tcm_vhost_get_fabric_wwn,
1491         .tpg_get_tag                    = tcm_vhost_get_tag,
1492         .tpg_get_default_depth          = tcm_vhost_get_default_depth,
1493         .tpg_get_pr_transport_id        = tcm_vhost_get_pr_transport_id,
1494         .tpg_get_pr_transport_id_len    = tcm_vhost_get_pr_transport_id_len,
1495         .tpg_parse_pr_out_transport_id  = tcm_vhost_parse_pr_out_transport_id,
1496         .tpg_check_demo_mode            = tcm_vhost_check_true,
1497         .tpg_check_demo_mode_cache      = tcm_vhost_check_true,
1498         .tpg_check_demo_mode_write_protect = tcm_vhost_check_false,
1499         .tpg_check_prod_mode_write_protect = tcm_vhost_check_false,
1500         .tpg_alloc_fabric_acl           = tcm_vhost_alloc_fabric_acl,
1501         .tpg_release_fabric_acl         = tcm_vhost_release_fabric_acl,
1502         .tpg_get_inst_index             = tcm_vhost_tpg_get_inst_index,
1503         .release_cmd                    = tcm_vhost_release_cmd,
1504         .shutdown_session               = tcm_vhost_shutdown_session,
1505         .close_session                  = tcm_vhost_close_session,
1506         .sess_get_index                 = tcm_vhost_sess_get_index,
1507         .sess_get_initiator_sid         = NULL,
1508         .write_pending                  = tcm_vhost_write_pending,
1509         .write_pending_status           = tcm_vhost_write_pending_status,
1510         .set_default_node_attributes    = tcm_vhost_set_default_node_attrs,
1511         .get_task_tag                   = tcm_vhost_get_task_tag,
1512         .get_cmd_state                  = tcm_vhost_get_cmd_state,
1513         .queue_data_in                  = tcm_vhost_queue_data_in,
1514         .queue_status                   = tcm_vhost_queue_status,
1515         .queue_tm_rsp                   = tcm_vhost_queue_tm_rsp,
1516         .get_fabric_sense_len           = tcm_vhost_get_fabric_sense_len,
1517         .set_fabric_sense_len           = tcm_vhost_set_fabric_sense_len,
1518         /*
1519          * Setup callers for generic logic in target_core_fabric_configfs.c
1520          */
1521         .fabric_make_wwn                = tcm_vhost_make_tport,
1522         .fabric_drop_wwn                = tcm_vhost_drop_tport,
1523         .fabric_make_tpg                = tcm_vhost_make_tpg,
1524         .fabric_drop_tpg                = tcm_vhost_drop_tpg,
1525         .fabric_post_link               = tcm_vhost_port_link,
1526         .fabric_pre_unlink              = tcm_vhost_port_unlink,
1527         .fabric_make_np                 = NULL,
1528         .fabric_drop_np                 = NULL,
1529         .fabric_make_nodeacl            = tcm_vhost_make_nodeacl,
1530         .fabric_drop_nodeacl            = tcm_vhost_drop_nodeacl,
1531 };
1532
1533 static int tcm_vhost_register_configfs(void)
1534 {
1535         struct target_fabric_configfs *fabric;
1536         int ret;
1537
1538         pr_debug("TCM_VHOST fabric module %s on %s/%s"
1539                 " on "UTS_RELEASE"\n", TCM_VHOST_VERSION, utsname()->sysname,
1540                 utsname()->machine);
1541         /*
1542          * Register the top level struct config_item_type with TCM core
1543          */
1544         fabric = target_fabric_configfs_init(THIS_MODULE, "vhost");
1545         if (IS_ERR(fabric)) {
1546                 pr_err("target_fabric_configfs_init() failed\n");
1547                 return PTR_ERR(fabric);
1548         }
1549         /*
1550          * Setup fabric->tf_ops from our local tcm_vhost_ops
1551          */
1552         fabric->tf_ops = tcm_vhost_ops;
1553         /*
1554          * Setup default attribute lists for various fabric->tf_cit_tmpl
1555          */
1556         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_vhost_wwn_attrs;
1557         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_vhost_tpg_attrs;
1558         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1559         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1560         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1561         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1562         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1563         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1564         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1565         /*
1566          * Register the fabric for use within TCM
1567          */
1568         ret = target_fabric_configfs_register(fabric);
1569         if (ret < 0) {
1570                 pr_err("target_fabric_configfs_register() failed"
1571                                 " for TCM_VHOST\n");
1572                 return ret;
1573         }
1574         /*
1575          * Setup our local pointer to *fabric
1576          */
1577         tcm_vhost_fabric_configfs = fabric;
1578         pr_debug("TCM_VHOST[0] - Set fabric -> tcm_vhost_fabric_configfs\n");
1579         return 0;
1580 };
1581
1582 static void tcm_vhost_deregister_configfs(void)
1583 {
1584         if (!tcm_vhost_fabric_configfs)
1585                 return;
1586
1587         target_fabric_configfs_deregister(tcm_vhost_fabric_configfs);
1588         tcm_vhost_fabric_configfs = NULL;
1589         pr_debug("TCM_VHOST[0] - Cleared tcm_vhost_fabric_configfs\n");
1590 };
1591
1592 static int __init tcm_vhost_init(void)
1593 {
1594         int ret = -ENOMEM;
1595
1596         tcm_vhost_workqueue = alloc_workqueue("tcm_vhost", 0, 0);
1597         if (!tcm_vhost_workqueue)
1598                 goto out;
1599
1600         ret = vhost_scsi_register();
1601         if (ret < 0)
1602                 goto out_destroy_workqueue;
1603
1604         ret = tcm_vhost_register_configfs();
1605         if (ret < 0)
1606                 goto out_vhost_scsi_deregister;
1607
1608         return 0;
1609
1610 out_vhost_scsi_deregister:
1611         vhost_scsi_deregister();
1612 out_destroy_workqueue:
1613         destroy_workqueue(tcm_vhost_workqueue);
1614 out:
1615         return ret;
1616 };
1617
1618 static void tcm_vhost_exit(void)
1619 {
1620         tcm_vhost_deregister_configfs();
1621         vhost_scsi_deregister();
1622         destroy_workqueue(tcm_vhost_workqueue);
1623 };
1624
1625 MODULE_DESCRIPTION("TCM_VHOST series fabric driver");
1626 MODULE_LICENSE("GPL");
1627 module_init(tcm_vhost_init);
1628 module_exit(tcm_vhost_exit);