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