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