linux/drivers/vhost/scsi.c
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   1/*******************************************************************************
   2 * Vhost kernel TCM fabric driver for virtio SCSI initiators
   3 *
   4 * (C) Copyright 2010-2013 Datera, Inc.
   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@daterainc.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/vmalloc.h>
  39#include <linux/miscdevice.h>
  40#include <asm/unaligned.h>
  41#include <scsi/scsi_common.h>
  42#include <scsi/scsi_proto.h>
  43#include <target/target_core_base.h>
  44#include <target/target_core_fabric.h>
  45#include <linux/vhost.h>
  46#include <linux/virtio_scsi.h>
  47#include <linux/llist.h>
  48#include <linux/bitmap.h>
  49
  50#include "vhost.h"
  51
  52#define VHOST_SCSI_VERSION  "v0.1"
  53#define VHOST_SCSI_NAMELEN 256
  54#define VHOST_SCSI_MAX_CDB_SIZE 32
  55#define VHOST_SCSI_DEFAULT_TAGS 256
  56#define VHOST_SCSI_PREALLOC_SGLS 2048
  57#define VHOST_SCSI_PREALLOC_UPAGES 2048
  58#define VHOST_SCSI_PREALLOC_PROT_SGLS 2048
  59
  60/* Max number of requests before requeueing the job.
  61 * Using this limit prevents one virtqueue from starving others with
  62 * request.
  63 */
  64#define VHOST_SCSI_WEIGHT 256
  65
  66struct vhost_scsi_inflight {
  67        /* Wait for the flush operation to finish */
  68        struct completion comp;
  69        /* Refcount for the inflight reqs */
  70        struct kref kref;
  71};
  72
  73struct vhost_scsi_cmd {
  74        /* Descriptor from vhost_get_vq_desc() for virt_queue segment */
  75        int tvc_vq_desc;
  76        /* virtio-scsi initiator task attribute */
  77        int tvc_task_attr;
  78        /* virtio-scsi response incoming iovecs */
  79        int tvc_in_iovs;
  80        /* virtio-scsi initiator data direction */
  81        enum dma_data_direction tvc_data_direction;
  82        /* Expected data transfer length from virtio-scsi header */
  83        u32 tvc_exp_data_len;
  84        /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
  85        u64 tvc_tag;
  86        /* The number of scatterlists associated with this cmd */
  87        u32 tvc_sgl_count;
  88        u32 tvc_prot_sgl_count;
  89        /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
  90        u32 tvc_lun;
  91        /* Pointer to the SGL formatted memory from virtio-scsi */
  92        struct scatterlist *tvc_sgl;
  93        struct scatterlist *tvc_prot_sgl;
  94        struct page **tvc_upages;
  95        /* Pointer to response header iovec */
  96        struct iovec tvc_resp_iov;
  97        /* Pointer to vhost_scsi for our device */
  98        struct vhost_scsi *tvc_vhost;
  99        /* Pointer to vhost_virtqueue for the cmd */
 100        struct vhost_virtqueue *tvc_vq;
 101        /* Pointer to vhost nexus memory */
 102        struct vhost_scsi_nexus *tvc_nexus;
 103        /* The TCM I/O descriptor that is accessed via container_of() */
 104        struct se_cmd tvc_se_cmd;
 105        /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
 106        struct work_struct work;
 107        /* Copy of the incoming SCSI command descriptor block (CDB) */
 108        unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
 109        /* Sense buffer that will be mapped into outgoing status */
 110        unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER];
 111        /* Completed commands list, serviced from vhost worker thread */
 112        struct llist_node tvc_completion_list;
 113        /* Used to track inflight cmd */
 114        struct vhost_scsi_inflight *inflight;
 115};
 116
 117struct vhost_scsi_nexus {
 118        /* Pointer to TCM session for I_T Nexus */
 119        struct se_session *tvn_se_sess;
 120};
 121
 122struct vhost_scsi_tpg {
 123        /* Vhost port target portal group tag for TCM */
 124        u16 tport_tpgt;
 125        /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */
 126        int tv_tpg_port_count;
 127        /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */
 128        int tv_tpg_vhost_count;
 129        /* Used for enabling T10-PI with legacy devices */
 130        int tv_fabric_prot_type;
 131        /* list for vhost_scsi_list */
 132        struct list_head tv_tpg_list;
 133        /* Used to protect access for tpg_nexus */
 134        struct mutex tv_tpg_mutex;
 135        /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */
 136        struct vhost_scsi_nexus *tpg_nexus;
 137        /* Pointer back to vhost_scsi_tport */
 138        struct vhost_scsi_tport *tport;
 139        /* Returned by vhost_scsi_make_tpg() */
 140        struct se_portal_group se_tpg;
 141        /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
 142        struct vhost_scsi *vhost_scsi;
 143};
 144
 145struct vhost_scsi_tport {
 146        /* SCSI protocol the tport is providing */
 147        u8 tport_proto_id;
 148        /* Binary World Wide unique Port Name for Vhost Target port */
 149        u64 tport_wwpn;
 150        /* ASCII formatted WWPN for Vhost Target port */
 151        char tport_name[VHOST_SCSI_NAMELEN];
 152        /* Returned by vhost_scsi_make_tport() */
 153        struct se_wwn tport_wwn;
 154};
 155
 156struct vhost_scsi_evt {
 157        /* event to be sent to guest */
 158        struct virtio_scsi_event event;
 159        /* event list, serviced from vhost worker thread */
 160        struct llist_node list;
 161};
 162
 163enum {
 164        VHOST_SCSI_VQ_CTL = 0,
 165        VHOST_SCSI_VQ_EVT = 1,
 166        VHOST_SCSI_VQ_IO = 2,
 167};
 168
 169/* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */
 170enum {
 171        VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
 172                                               (1ULL << VIRTIO_SCSI_F_T10_PI)
 173};
 174
 175#define VHOST_SCSI_MAX_TARGET   256
 176#define VHOST_SCSI_MAX_VQ       128
 177#define VHOST_SCSI_MAX_EVENT    128
 178
 179struct vhost_scsi_virtqueue {
 180        struct vhost_virtqueue vq;
 181        /*
 182         * Reference counting for inflight reqs, used for flush operation. At
 183         * each time, one reference tracks new commands submitted, while we
 184         * wait for another one to reach 0.
 185         */
 186        struct vhost_scsi_inflight inflights[2];
 187        /*
 188         * Indicate current inflight in use, protected by vq->mutex.
 189         * Writers must also take dev mutex and flush under it.
 190         */
 191        int inflight_idx;
 192};
 193
 194struct vhost_scsi {
 195        /* Protected by vhost_scsi->dev.mutex */
 196        struct vhost_scsi_tpg **vs_tpg;
 197        char vs_vhost_wwpn[TRANSPORT_IQN_LEN];
 198
 199        struct vhost_dev dev;
 200        struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ];
 201
 202        struct vhost_work vs_completion_work; /* cmd completion work item */
 203        struct llist_head vs_completion_list; /* cmd completion queue */
 204
 205        struct vhost_work vs_event_work; /* evt injection work item */
 206        struct llist_head vs_event_list; /* evt injection queue */
 207
 208        bool vs_events_missed; /* any missed events, protected by vq->mutex */
 209        int vs_events_nr; /* num of pending events, protected by vq->mutex */
 210};
 211
 212/*
 213 * Context for processing request and control queue operations.
 214 */
 215struct vhost_scsi_ctx {
 216        int head;
 217        unsigned int out, in;
 218        size_t req_size, rsp_size;
 219        size_t out_size, in_size;
 220        u8 *target, *lunp;
 221        void *req;
 222        struct iov_iter out_iter;
 223};
 224
 225static struct workqueue_struct *vhost_scsi_workqueue;
 226
 227/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
 228static DEFINE_MUTEX(vhost_scsi_mutex);
 229static LIST_HEAD(vhost_scsi_list);
 230
 231static void vhost_scsi_done_inflight(struct kref *kref)
 232{
 233        struct vhost_scsi_inflight *inflight;
 234
 235        inflight = container_of(kref, struct vhost_scsi_inflight, kref);
 236        complete(&inflight->comp);
 237}
 238
 239static void vhost_scsi_init_inflight(struct vhost_scsi *vs,
 240                                    struct vhost_scsi_inflight *old_inflight[])
 241{
 242        struct vhost_scsi_inflight *new_inflight;
 243        struct vhost_virtqueue *vq;
 244        int idx, i;
 245
 246        for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
 247                vq = &vs->vqs[i].vq;
 248
 249                mutex_lock(&vq->mutex);
 250
 251                /* store old infight */
 252                idx = vs->vqs[i].inflight_idx;
 253                if (old_inflight)
 254                        old_inflight[i] = &vs->vqs[i].inflights[idx];
 255
 256                /* setup new infight */
 257                vs->vqs[i].inflight_idx = idx ^ 1;
 258                new_inflight = &vs->vqs[i].inflights[idx ^ 1];
 259                kref_init(&new_inflight->kref);
 260                init_completion(&new_inflight->comp);
 261
 262                mutex_unlock(&vq->mutex);
 263        }
 264}
 265
 266static struct vhost_scsi_inflight *
 267vhost_scsi_get_inflight(struct vhost_virtqueue *vq)
 268{
 269        struct vhost_scsi_inflight *inflight;
 270        struct vhost_scsi_virtqueue *svq;
 271
 272        svq = container_of(vq, struct vhost_scsi_virtqueue, vq);
 273        inflight = &svq->inflights[svq->inflight_idx];
 274        kref_get(&inflight->kref);
 275
 276        return inflight;
 277}
 278
 279static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight)
 280{
 281        kref_put(&inflight->kref, vhost_scsi_done_inflight);
 282}
 283
 284static int vhost_scsi_check_true(struct se_portal_group *se_tpg)
 285{
 286        return 1;
 287}
 288
 289static int vhost_scsi_check_false(struct se_portal_group *se_tpg)
 290{
 291        return 0;
 292}
 293
 294static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg)
 295{
 296        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 297                                struct vhost_scsi_tpg, se_tpg);
 298        struct vhost_scsi_tport *tport = tpg->tport;
 299
 300        return &tport->tport_name[0];
 301}
 302
 303static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg)
 304{
 305        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 306                                struct vhost_scsi_tpg, se_tpg);
 307        return tpg->tport_tpgt;
 308}
 309
 310static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg)
 311{
 312        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
 313                                struct vhost_scsi_tpg, se_tpg);
 314
 315        return tpg->tv_fabric_prot_type;
 316}
 317
 318static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg)
 319{
 320        return 1;
 321}
 322
 323static void vhost_scsi_release_cmd(struct se_cmd *se_cmd)
 324{
 325        struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd,
 326                                struct vhost_scsi_cmd, tvc_se_cmd);
 327        struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess;
 328        int i;
 329
 330        if (tv_cmd->tvc_sgl_count) {
 331                for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
 332                        put_page(sg_page(&tv_cmd->tvc_sgl[i]));
 333        }
 334        if (tv_cmd->tvc_prot_sgl_count) {
 335                for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
 336                        put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
 337        }
 338
 339        vhost_scsi_put_inflight(tv_cmd->inflight);
 340        target_free_tag(se_sess, se_cmd);
 341}
 342
 343static u32 vhost_scsi_sess_get_index(struct se_session *se_sess)
 344{
 345        return 0;
 346}
 347
 348static int vhost_scsi_write_pending(struct se_cmd *se_cmd)
 349{
 350        /* Go ahead and process the write immediately */
 351        target_execute_cmd(se_cmd);
 352        return 0;
 353}
 354
 355static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
 356{
 357        return;
 358}
 359
 360static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
 361{
 362        return 0;
 363}
 364
 365static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd)
 366{
 367        struct vhost_scsi *vs = cmd->tvc_vhost;
 368
 369        llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list);
 370
 371        vhost_work_queue(&vs->dev, &vs->vs_completion_work);
 372}
 373
 374static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd)
 375{
 376        struct vhost_scsi_cmd *cmd = container_of(se_cmd,
 377                                struct vhost_scsi_cmd, tvc_se_cmd);
 378        vhost_scsi_complete_cmd(cmd);
 379        return 0;
 380}
 381
 382static int vhost_scsi_queue_status(struct se_cmd *se_cmd)
 383{
 384        struct vhost_scsi_cmd *cmd = container_of(se_cmd,
 385                                struct vhost_scsi_cmd, tvc_se_cmd);
 386        vhost_scsi_complete_cmd(cmd);
 387        return 0;
 388}
 389
 390static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd)
 391{
 392        return;
 393}
 394
 395static void vhost_scsi_aborted_task(struct se_cmd *se_cmd)
 396{
 397        return;
 398}
 399
 400static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
 401{
 402        vs->vs_events_nr--;
 403        kfree(evt);
 404}
 405
 406static struct vhost_scsi_evt *
 407vhost_scsi_allocate_evt(struct vhost_scsi *vs,
 408                       u32 event, u32 reason)
 409{
 410        struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
 411        struct vhost_scsi_evt *evt;
 412
 413        if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
 414                vs->vs_events_missed = true;
 415                return NULL;
 416        }
 417
 418        evt = kzalloc(sizeof(*evt), GFP_KERNEL);
 419        if (!evt) {
 420                vq_err(vq, "Failed to allocate vhost_scsi_evt\n");
 421                vs->vs_events_missed = true;
 422                return NULL;
 423        }
 424
 425        evt->event.event = cpu_to_vhost32(vq, event);
 426        evt->event.reason = cpu_to_vhost32(vq, reason);
 427        vs->vs_events_nr++;
 428
 429        return evt;
 430}
 431
 432static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd)
 433{
 434        struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
 435
 436        /* TODO locking against target/backend threads? */
 437        transport_generic_free_cmd(se_cmd, 0);
 438
 439}
 440
 441static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd)
 442{
 443        return target_put_sess_cmd(se_cmd);
 444}
 445
 446static void
 447vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
 448{
 449        struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
 450        struct virtio_scsi_event *event = &evt->event;
 451        struct virtio_scsi_event __user *eventp;
 452        unsigned out, in;
 453        int head, ret;
 454
 455        if (!vq->private_data) {
 456                vs->vs_events_missed = true;
 457                return;
 458        }
 459
 460again:
 461        vhost_disable_notify(&vs->dev, vq);
 462        head = vhost_get_vq_desc(vq, vq->iov,
 463                        ARRAY_SIZE(vq->iov), &out, &in,
 464                        NULL, NULL);
 465        if (head < 0) {
 466                vs->vs_events_missed = true;
 467                return;
 468        }
 469        if (head == vq->num) {
 470                if (vhost_enable_notify(&vs->dev, vq))
 471                        goto again;
 472                vs->vs_events_missed = true;
 473                return;
 474        }
 475
 476        if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
 477                vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
 478                                vq->iov[out].iov_len);
 479                vs->vs_events_missed = true;
 480                return;
 481        }
 482
 483        if (vs->vs_events_missed) {
 484                event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED);
 485                vs->vs_events_missed = false;
 486        }
 487
 488        eventp = vq->iov[out].iov_base;
 489        ret = __copy_to_user(eventp, event, sizeof(*event));
 490        if (!ret)
 491                vhost_add_used_and_signal(&vs->dev, vq, head, 0);
 492        else
 493                vq_err(vq, "Faulted on vhost_scsi_send_event\n");
 494}
 495
 496static void vhost_scsi_evt_work(struct vhost_work *work)
 497{
 498        struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
 499                                        vs_event_work);
 500        struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
 501        struct vhost_scsi_evt *evt, *t;
 502        struct llist_node *llnode;
 503
 504        mutex_lock(&vq->mutex);
 505        llnode = llist_del_all(&vs->vs_event_list);
 506        llist_for_each_entry_safe(evt, t, llnode, list) {
 507                vhost_scsi_do_evt_work(vs, evt);
 508                vhost_scsi_free_evt(vs, evt);
 509        }
 510        mutex_unlock(&vq->mutex);
 511}
 512
 513/* Fill in status and signal that we are done processing this command
 514 *
 515 * This is scheduled in the vhost work queue so we are called with the owner
 516 * process mm and can access the vring.
 517 */
 518static void vhost_scsi_complete_cmd_work(struct vhost_work *work)
 519{
 520        struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
 521                                        vs_completion_work);
 522        DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ);
 523        struct virtio_scsi_cmd_resp v_rsp;
 524        struct vhost_scsi_cmd *cmd, *t;
 525        struct llist_node *llnode;
 526        struct se_cmd *se_cmd;
 527        struct iov_iter iov_iter;
 528        int ret, vq;
 529
 530        bitmap_zero(signal, VHOST_SCSI_MAX_VQ);
 531        llnode = llist_del_all(&vs->vs_completion_list);
 532        llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) {
 533                se_cmd = &cmd->tvc_se_cmd;
 534
 535                pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__,
 536                        cmd, se_cmd->residual_count, se_cmd->scsi_status);
 537
 538                memset(&v_rsp, 0, sizeof(v_rsp));
 539                v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count);
 540                /* TODO is status_qualifier field needed? */
 541                v_rsp.status = se_cmd->scsi_status;
 542                v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq,
 543                                                 se_cmd->scsi_sense_length);
 544                memcpy(v_rsp.sense, cmd->tvc_sense_buf,
 545                       se_cmd->scsi_sense_length);
 546
 547                iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov,
 548                              cmd->tvc_in_iovs, sizeof(v_rsp));
 549                ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter);
 550                if (likely(ret == sizeof(v_rsp))) {
 551                        struct vhost_scsi_virtqueue *q;
 552                        vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0);
 553                        q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq);
 554                        vq = q - vs->vqs;
 555                        __set_bit(vq, signal);
 556                } else
 557                        pr_err("Faulted on virtio_scsi_cmd_resp\n");
 558
 559                vhost_scsi_free_cmd(cmd);
 560        }
 561
 562        vq = -1;
 563        while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1))
 564                < VHOST_SCSI_MAX_VQ)
 565                vhost_signal(&vs->dev, &vs->vqs[vq].vq);
 566}
 567
 568static struct vhost_scsi_cmd *
 569vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg,
 570                   unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
 571                   u32 exp_data_len, int data_direction)
 572{
 573        struct vhost_scsi_cmd *cmd;
 574        struct vhost_scsi_nexus *tv_nexus;
 575        struct se_session *se_sess;
 576        struct scatterlist *sg, *prot_sg;
 577        struct page **pages;
 578        int tag, cpu;
 579
 580        tv_nexus = tpg->tpg_nexus;
 581        if (!tv_nexus) {
 582                pr_err("Unable to locate active struct vhost_scsi_nexus\n");
 583                return ERR_PTR(-EIO);
 584        }
 585        se_sess = tv_nexus->tvn_se_sess;
 586
 587        tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
 588        if (tag < 0) {
 589                pr_err("Unable to obtain tag for vhost_scsi_cmd\n");
 590                return ERR_PTR(-ENOMEM);
 591        }
 592
 593        cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag];
 594        sg = cmd->tvc_sgl;
 595        prot_sg = cmd->tvc_prot_sgl;
 596        pages = cmd->tvc_upages;
 597        memset(cmd, 0, sizeof(*cmd));
 598        cmd->tvc_sgl = sg;
 599        cmd->tvc_prot_sgl = prot_sg;
 600        cmd->tvc_upages = pages;
 601        cmd->tvc_se_cmd.map_tag = tag;
 602        cmd->tvc_se_cmd.map_cpu = cpu;
 603        cmd->tvc_tag = scsi_tag;
 604        cmd->tvc_lun = lun;
 605        cmd->tvc_task_attr = task_attr;
 606        cmd->tvc_exp_data_len = exp_data_len;
 607        cmd->tvc_data_direction = data_direction;
 608        cmd->tvc_nexus = tv_nexus;
 609        cmd->inflight = vhost_scsi_get_inflight(vq);
 610
 611        memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE);
 612
 613        return cmd;
 614}
 615
 616/*
 617 * Map a user memory range into a scatterlist
 618 *
 619 * Returns the number of scatterlist entries used or -errno on error.
 620 */
 621static int
 622vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd,
 623                      struct iov_iter *iter,
 624                      struct scatterlist *sgl,
 625                      bool write)
 626{
 627        struct page **pages = cmd->tvc_upages;
 628        struct scatterlist *sg = sgl;
 629        ssize_t bytes;
 630        size_t offset;
 631        unsigned int npages = 0;
 632
 633        bytes = iov_iter_get_pages(iter, pages, LONG_MAX,
 634                                VHOST_SCSI_PREALLOC_UPAGES, &offset);
 635        /* No pages were pinned */
 636        if (bytes <= 0)
 637                return bytes < 0 ? bytes : -EFAULT;
 638
 639        iov_iter_advance(iter, bytes);
 640
 641        while (bytes) {
 642                unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes);
 643                sg_set_page(sg++, pages[npages++], n, offset);
 644                bytes -= n;
 645                offset = 0;
 646        }
 647        return npages;
 648}
 649
 650static int
 651vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
 652{
 653        int sgl_count = 0;
 654
 655        if (!iter || !iter->iov) {
 656                pr_err("%s: iter->iov is NULL, but expected bytes: %zu"
 657                       " present\n", __func__, bytes);
 658                return -EINVAL;
 659        }
 660
 661        sgl_count = iov_iter_npages(iter, 0xffff);
 662        if (sgl_count > max_sgls) {
 663                pr_err("%s: requested sgl_count: %d exceeds pre-allocated"
 664                       " max_sgls: %d\n", __func__, sgl_count, max_sgls);
 665                return -EINVAL;
 666        }
 667        return sgl_count;
 668}
 669
 670static int
 671vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write,
 672                      struct iov_iter *iter,
 673                      struct scatterlist *sg, int sg_count)
 674{
 675        struct scatterlist *p = sg;
 676        int ret;
 677
 678        while (iov_iter_count(iter)) {
 679                ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write);
 680                if (ret < 0) {
 681                        while (p < sg) {
 682                                struct page *page = sg_page(p++);
 683                                if (page)
 684                                        put_page(page);
 685                        }
 686                        return ret;
 687                }
 688                sg += ret;
 689        }
 690        return 0;
 691}
 692
 693static int
 694vhost_scsi_mapal(struct vhost_scsi_cmd *cmd,
 695                 size_t prot_bytes, struct iov_iter *prot_iter,
 696                 size_t data_bytes, struct iov_iter *data_iter)
 697{
 698        int sgl_count, ret;
 699        bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE);
 700
 701        if (prot_bytes) {
 702                sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes,
 703                                                 VHOST_SCSI_PREALLOC_PROT_SGLS);
 704                if (sgl_count < 0)
 705                        return sgl_count;
 706
 707                sg_init_table(cmd->tvc_prot_sgl, sgl_count);
 708                cmd->tvc_prot_sgl_count = sgl_count;
 709                pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
 710                         cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count);
 711
 712                ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter,
 713                                            cmd->tvc_prot_sgl,
 714                                            cmd->tvc_prot_sgl_count);
 715                if (ret < 0) {
 716                        cmd->tvc_prot_sgl_count = 0;
 717                        return ret;
 718                }
 719        }
 720        sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes,
 721                                         VHOST_SCSI_PREALLOC_SGLS);
 722        if (sgl_count < 0)
 723                return sgl_count;
 724
 725        sg_init_table(cmd->tvc_sgl, sgl_count);
 726        cmd->tvc_sgl_count = sgl_count;
 727        pr_debug("%s data_sg %p data_sgl_count %u\n", __func__,
 728                  cmd->tvc_sgl, cmd->tvc_sgl_count);
 729
 730        ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter,
 731                                    cmd->tvc_sgl, cmd->tvc_sgl_count);
 732        if (ret < 0) {
 733                cmd->tvc_sgl_count = 0;
 734                return ret;
 735        }
 736        return 0;
 737}
 738
 739static int vhost_scsi_to_tcm_attr(int attr)
 740{
 741        switch (attr) {
 742        case VIRTIO_SCSI_S_SIMPLE:
 743                return TCM_SIMPLE_TAG;
 744        case VIRTIO_SCSI_S_ORDERED:
 745                return TCM_ORDERED_TAG;
 746        case VIRTIO_SCSI_S_HEAD:
 747                return TCM_HEAD_TAG;
 748        case VIRTIO_SCSI_S_ACA:
 749                return TCM_ACA_TAG;
 750        default:
 751                break;
 752        }
 753        return TCM_SIMPLE_TAG;
 754}
 755
 756static void vhost_scsi_submission_work(struct work_struct *work)
 757{
 758        struct vhost_scsi_cmd *cmd =
 759                container_of(work, struct vhost_scsi_cmd, work);
 760        struct vhost_scsi_nexus *tv_nexus;
 761        struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
 762        struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
 763        int rc;
 764
 765        /* FIXME: BIDI operation */
 766        if (cmd->tvc_sgl_count) {
 767                sg_ptr = cmd->tvc_sgl;
 768
 769                if (cmd->tvc_prot_sgl_count)
 770                        sg_prot_ptr = cmd->tvc_prot_sgl;
 771                else
 772                        se_cmd->prot_pto = true;
 773        } else {
 774                sg_ptr = NULL;
 775        }
 776        tv_nexus = cmd->tvc_nexus;
 777
 778        se_cmd->tag = 0;
 779        rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
 780                        cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
 781                        cmd->tvc_lun, cmd->tvc_exp_data_len,
 782                        vhost_scsi_to_tcm_attr(cmd->tvc_task_attr),
 783                        cmd->tvc_data_direction, TARGET_SCF_ACK_KREF,
 784                        sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr,
 785                        cmd->tvc_prot_sgl_count);
 786        if (rc < 0) {
 787                transport_send_check_condition_and_sense(se_cmd,
 788                                TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 789                transport_generic_free_cmd(se_cmd, 0);
 790        }
 791}
 792
 793static void
 794vhost_scsi_send_bad_target(struct vhost_scsi *vs,
 795                           struct vhost_virtqueue *vq,
 796                           int head, unsigned out)
 797{
 798        struct virtio_scsi_cmd_resp __user *resp;
 799        struct virtio_scsi_cmd_resp rsp;
 800        int ret;
 801
 802        memset(&rsp, 0, sizeof(rsp));
 803        rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
 804        resp = vq->iov[out].iov_base;
 805        ret = __copy_to_user(resp, &rsp, sizeof(rsp));
 806        if (!ret)
 807                vhost_add_used_and_signal(&vs->dev, vq, head, 0);
 808        else
 809                pr_err("Faulted on virtio_scsi_cmd_resp\n");
 810}
 811
 812static int
 813vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq,
 814                    struct vhost_scsi_ctx *vc)
 815{
 816        int ret = -ENXIO;
 817
 818        vc->head = vhost_get_vq_desc(vq, vq->iov,
 819                                     ARRAY_SIZE(vq->iov), &vc->out, &vc->in,
 820                                     NULL, NULL);
 821
 822        pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
 823                 vc->head, vc->out, vc->in);
 824
 825        /* On error, stop handling until the next kick. */
 826        if (unlikely(vc->head < 0))
 827                goto done;
 828
 829        /* Nothing new?  Wait for eventfd to tell us they refilled. */
 830        if (vc->head == vq->num) {
 831                if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
 832                        vhost_disable_notify(&vs->dev, vq);
 833                        ret = -EAGAIN;
 834                }
 835                goto done;
 836        }
 837
 838        /*
 839         * Get the size of request and response buffers.
 840         * FIXME: Not correct for BIDI operation
 841         */
 842        vc->out_size = iov_length(vq->iov, vc->out);
 843        vc->in_size = iov_length(&vq->iov[vc->out], vc->in);
 844
 845        /*
 846         * Copy over the virtio-scsi request header, which for a
 847         * ANY_LAYOUT enabled guest may span multiple iovecs, or a
 848         * single iovec may contain both the header + outgoing
 849         * WRITE payloads.
 850         *
 851         * copy_from_iter() will advance out_iter, so that it will
 852         * point at the start of the outgoing WRITE payload, if
 853         * DMA_TO_DEVICE is set.
 854         */
 855        iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size);
 856        ret = 0;
 857
 858done:
 859        return ret;
 860}
 861
 862static int
 863vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc)
 864{
 865        if (unlikely(vc->in_size < vc->rsp_size)) {
 866                vq_err(vq,
 867                       "Response buf too small, need min %zu bytes got %zu",
 868                       vc->rsp_size, vc->in_size);
 869                return -EINVAL;
 870        } else if (unlikely(vc->out_size < vc->req_size)) {
 871                vq_err(vq,
 872                       "Request buf too small, need min %zu bytes got %zu",
 873                       vc->req_size, vc->out_size);
 874                return -EIO;
 875        }
 876
 877        return 0;
 878}
 879
 880static int
 881vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc,
 882                   struct vhost_scsi_tpg **tpgp)
 883{
 884        int ret = -EIO;
 885
 886        if (unlikely(!copy_from_iter_full(vc->req, vc->req_size,
 887                                          &vc->out_iter))) {
 888                vq_err(vq, "Faulted on copy_from_iter_full\n");
 889        } else if (unlikely(*vc->lunp != 1)) {
 890                /* virtio-scsi spec requires byte 0 of the lun to be 1 */
 891                vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp);
 892        } else {
 893                struct vhost_scsi_tpg **vs_tpg, *tpg;
 894
 895                vs_tpg = vq->private_data;      /* validated at handler entry */
 896
 897                tpg = READ_ONCE(vs_tpg[*vc->target]);
 898                if (unlikely(!tpg)) {
 899                        vq_err(vq, "Target 0x%x does not exist\n", *vc->target);
 900                } else {
 901                        if (tpgp)
 902                                *tpgp = tpg;
 903                        ret = 0;
 904                }
 905        }
 906
 907        return ret;
 908}
 909
 910static void
 911vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
 912{
 913        struct vhost_scsi_tpg **vs_tpg, *tpg;
 914        struct virtio_scsi_cmd_req v_req;
 915        struct virtio_scsi_cmd_req_pi v_req_pi;
 916        struct vhost_scsi_ctx vc;
 917        struct vhost_scsi_cmd *cmd;
 918        struct iov_iter in_iter, prot_iter, data_iter;
 919        u64 tag;
 920        u32 exp_data_len, data_direction;
 921        int ret, prot_bytes, c = 0;
 922        u16 lun;
 923        u8 task_attr;
 924        bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI);
 925        void *cdb;
 926
 927        mutex_lock(&vq->mutex);
 928        /*
 929         * We can handle the vq only after the endpoint is setup by calling the
 930         * VHOST_SCSI_SET_ENDPOINT ioctl.
 931         */
 932        vs_tpg = vq->private_data;
 933        if (!vs_tpg)
 934                goto out;
 935
 936        memset(&vc, 0, sizeof(vc));
 937        vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp);
 938
 939        vhost_disable_notify(&vs->dev, vq);
 940
 941        do {
 942                ret = vhost_scsi_get_desc(vs, vq, &vc);
 943                if (ret)
 944                        goto err;
 945
 946                /*
 947                 * Setup pointers and values based upon different virtio-scsi
 948                 * request header if T10_PI is enabled in KVM guest.
 949                 */
 950                if (t10_pi) {
 951                        vc.req = &v_req_pi;
 952                        vc.req_size = sizeof(v_req_pi);
 953                        vc.lunp = &v_req_pi.lun[0];
 954                        vc.target = &v_req_pi.lun[1];
 955                } else {
 956                        vc.req = &v_req;
 957                        vc.req_size = sizeof(v_req);
 958                        vc.lunp = &v_req.lun[0];
 959                        vc.target = &v_req.lun[1];
 960                }
 961
 962                /*
 963                 * Validate the size of request and response buffers.
 964                 * Check for a sane response buffer so we can report
 965                 * early errors back to the guest.
 966                 */
 967                ret = vhost_scsi_chk_size(vq, &vc);
 968                if (ret)
 969                        goto err;
 970
 971                ret = vhost_scsi_get_req(vq, &vc, &tpg);
 972                if (ret)
 973                        goto err;
 974
 975                ret = -EIO;     /* bad target on any error from here on */
 976
 977                /*
 978                 * Determine data_direction by calculating the total outgoing
 979                 * iovec sizes + incoming iovec sizes vs. virtio-scsi request +
 980                 * response headers respectively.
 981                 *
 982                 * For DMA_TO_DEVICE this is out_iter, which is already pointing
 983                 * to the right place.
 984                 *
 985                 * For DMA_FROM_DEVICE, the iovec will be just past the end
 986                 * of the virtio-scsi response header in either the same
 987                 * or immediately following iovec.
 988                 *
 989                 * Any associated T10_PI bytes for the outgoing / incoming
 990                 * payloads are included in calculation of exp_data_len here.
 991                 */
 992                prot_bytes = 0;
 993
 994                if (vc.out_size > vc.req_size) {
 995                        data_direction = DMA_TO_DEVICE;
 996                        exp_data_len = vc.out_size - vc.req_size;
 997                        data_iter = vc.out_iter;
 998                } else if (vc.in_size > vc.rsp_size) {
 999                        data_direction = DMA_FROM_DEVICE;
1000                        exp_data_len = vc.in_size - vc.rsp_size;
1001
1002                        iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in,
1003                                      vc.rsp_size + exp_data_len);
1004                        iov_iter_advance(&in_iter, vc.rsp_size);
1005                        data_iter = in_iter;
1006                } else {
1007                        data_direction = DMA_NONE;
1008                        exp_data_len = 0;
1009                }
1010                /*
1011                 * If T10_PI header + payload is present, setup prot_iter values
1012                 * and recalculate data_iter for vhost_scsi_mapal() mapping to
1013                 * host scatterlists via get_user_pages_fast().
1014                 */
1015                if (t10_pi) {
1016                        if (v_req_pi.pi_bytesout) {
1017                                if (data_direction != DMA_TO_DEVICE) {
1018                                        vq_err(vq, "Received non zero pi_bytesout,"
1019                                                " but wrong data_direction\n");
1020                                        goto err;
1021                                }
1022                                prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout);
1023                        } else if (v_req_pi.pi_bytesin) {
1024                                if (data_direction != DMA_FROM_DEVICE) {
1025                                        vq_err(vq, "Received non zero pi_bytesin,"
1026                                                " but wrong data_direction\n");
1027                                        goto err;
1028                                }
1029                                prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin);
1030                        }
1031                        /*
1032                         * Set prot_iter to data_iter and truncate it to
1033                         * prot_bytes, and advance data_iter past any
1034                         * preceeding prot_bytes that may be present.
1035                         *
1036                         * Also fix up the exp_data_len to reflect only the
1037                         * actual data payload length.
1038                         */
1039                        if (prot_bytes) {
1040                                exp_data_len -= prot_bytes;
1041                                prot_iter = data_iter;
1042                                iov_iter_truncate(&prot_iter, prot_bytes);
1043                                iov_iter_advance(&data_iter, prot_bytes);
1044                        }
1045                        tag = vhost64_to_cpu(vq, v_req_pi.tag);
1046                        task_attr = v_req_pi.task_attr;
1047                        cdb = &v_req_pi.cdb[0];
1048                        lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF;
1049                } else {
1050                        tag = vhost64_to_cpu(vq, v_req.tag);
1051                        task_attr = v_req.task_attr;
1052                        cdb = &v_req.cdb[0];
1053                        lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
1054                }
1055                /*
1056                 * Check that the received CDB size does not exceeded our
1057                 * hardcoded max for vhost-scsi, then get a pre-allocated
1058                 * cmd descriptor for the new virtio-scsi tag.
1059                 *
1060                 * TODO what if cdb was too small for varlen cdb header?
1061                 */
1062                if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) {
1063                        vq_err(vq, "Received SCSI CDB with command_size: %d that"
1064                                " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1065                                scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE);
1066                                goto err;
1067                }
1068                cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
1069                                         exp_data_len + prot_bytes,
1070                                         data_direction);
1071                if (IS_ERR(cmd)) {
1072                        vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
1073                               PTR_ERR(cmd));
1074                        goto err;
1075                }
1076                cmd->tvc_vhost = vs;
1077                cmd->tvc_vq = vq;
1078                cmd->tvc_resp_iov = vq->iov[vc.out];
1079                cmd->tvc_in_iovs = vc.in;
1080
1081                pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
1082                         cmd->tvc_cdb[0], cmd->tvc_lun);
1083                pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:"
1084                         " %d\n", cmd, exp_data_len, prot_bytes, data_direction);
1085
1086                if (data_direction != DMA_NONE) {
1087                        if (unlikely(vhost_scsi_mapal(cmd, prot_bytes,
1088                                                      &prot_iter, exp_data_len,
1089                                                      &data_iter))) {
1090                                vq_err(vq, "Failed to map iov to sgl\n");
1091                                vhost_scsi_release_cmd(&cmd->tvc_se_cmd);
1092                                goto err;
1093                        }
1094                }
1095                /*
1096                 * Save the descriptor from vhost_get_vq_desc() to be used to
1097                 * complete the virtio-scsi request in TCM callback context via
1098                 * vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
1099                 */
1100                cmd->tvc_vq_desc = vc.head;
1101                /*
1102                 * Dispatch cmd descriptor for cmwq execution in process
1103                 * context provided by vhost_scsi_workqueue.  This also ensures
1104                 * cmd is executed on the same kworker CPU as this vhost
1105                 * thread to gain positive L2 cache locality effects.
1106                 */
1107                INIT_WORK(&cmd->work, vhost_scsi_submission_work);
1108                queue_work(vhost_scsi_workqueue, &cmd->work);
1109                ret = 0;
1110err:
1111                /*
1112                 * ENXIO:  No more requests, or read error, wait for next kick
1113                 * EINVAL: Invalid response buffer, drop the request
1114                 * EIO:    Respond with bad target
1115                 * EAGAIN: Pending request
1116                 */
1117                if (ret == -ENXIO)
1118                        break;
1119                else if (ret == -EIO)
1120                        vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
1121        } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1122out:
1123        mutex_unlock(&vq->mutex);
1124}
1125
1126static void
1127vhost_scsi_send_tmf_reject(struct vhost_scsi *vs,
1128                           struct vhost_virtqueue *vq,
1129                           struct vhost_scsi_ctx *vc)
1130{
1131        struct virtio_scsi_ctrl_tmf_resp rsp;
1132        struct iov_iter iov_iter;
1133        int ret;
1134
1135        pr_debug("%s\n", __func__);
1136        memset(&rsp, 0, sizeof(rsp));
1137        rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
1138
1139        iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp));
1140
1141        ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1142        if (likely(ret == sizeof(rsp)))
1143                vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0);
1144        else
1145                pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n");
1146}
1147
1148static void
1149vhost_scsi_send_an_resp(struct vhost_scsi *vs,
1150                        struct vhost_virtqueue *vq,
1151                        struct vhost_scsi_ctx *vc)
1152{
1153        struct virtio_scsi_ctrl_an_resp rsp;
1154        struct iov_iter iov_iter;
1155        int ret;
1156
1157        pr_debug("%s\n", __func__);
1158        memset(&rsp, 0, sizeof(rsp));   /* event_actual = 0 */
1159        rsp.response = VIRTIO_SCSI_S_OK;
1160
1161        iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp));
1162
1163        ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter);
1164        if (likely(ret == sizeof(rsp)))
1165                vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0);
1166        else
1167                pr_err("Faulted on virtio_scsi_ctrl_an_resp\n");
1168}
1169
1170static void
1171vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
1172{
1173        union {
1174                __virtio32 type;
1175                struct virtio_scsi_ctrl_an_req an;
1176                struct virtio_scsi_ctrl_tmf_req tmf;
1177        } v_req;
1178        struct vhost_scsi_ctx vc;
1179        size_t typ_size;
1180        int ret, c = 0;
1181
1182        mutex_lock(&vq->mutex);
1183        /*
1184         * We can handle the vq only after the endpoint is setup by calling the
1185         * VHOST_SCSI_SET_ENDPOINT ioctl.
1186         */
1187        if (!vq->private_data)
1188                goto out;
1189
1190        memset(&vc, 0, sizeof(vc));
1191
1192        vhost_disable_notify(&vs->dev, vq);
1193
1194        do {
1195                ret = vhost_scsi_get_desc(vs, vq, &vc);
1196                if (ret)
1197                        goto err;
1198
1199                /*
1200                 * Get the request type first in order to setup
1201                 * other parameters dependent on the type.
1202                 */
1203                vc.req = &v_req.type;
1204                typ_size = sizeof(v_req.type);
1205
1206                if (unlikely(!copy_from_iter_full(vc.req, typ_size,
1207                                                  &vc.out_iter))) {
1208                        vq_err(vq, "Faulted on copy_from_iter tmf type\n");
1209                        /*
1210                         * The size of the response buffer depends on the
1211                         * request type and must be validated against it.
1212                         * Since the request type is not known, don't send
1213                         * a response.
1214                         */
1215                        continue;
1216                }
1217
1218                switch (v_req.type) {
1219                case VIRTIO_SCSI_T_TMF:
1220                        vc.req = &v_req.tmf;
1221                        vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req);
1222                        vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp);
1223                        vc.lunp = &v_req.tmf.lun[0];
1224                        vc.target = &v_req.tmf.lun[1];
1225                        break;
1226                case VIRTIO_SCSI_T_AN_QUERY:
1227                case VIRTIO_SCSI_T_AN_SUBSCRIBE:
1228                        vc.req = &v_req.an;
1229                        vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req);
1230                        vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp);
1231                        vc.lunp = &v_req.an.lun[0];
1232                        vc.target = NULL;
1233                        break;
1234                default:
1235                        vq_err(vq, "Unknown control request %d", v_req.type);
1236                        continue;
1237                }
1238
1239                /*
1240                 * Validate the size of request and response buffers.
1241                 * Check for a sane response buffer so we can report
1242                 * early errors back to the guest.
1243                 */
1244                ret = vhost_scsi_chk_size(vq, &vc);
1245                if (ret)
1246                        goto err;
1247
1248                /*
1249                 * Get the rest of the request now that its size is known.
1250                 */
1251                vc.req += typ_size;
1252                vc.req_size -= typ_size;
1253
1254                ret = vhost_scsi_get_req(vq, &vc, NULL);
1255                if (ret)
1256                        goto err;
1257
1258                if (v_req.type == VIRTIO_SCSI_T_TMF)
1259                        vhost_scsi_send_tmf_reject(vs, vq, &vc);
1260                else
1261                        vhost_scsi_send_an_resp(vs, vq, &vc);
1262err:
1263                /*
1264                 * ENXIO:  No more requests, or read error, wait for next kick
1265                 * EINVAL: Invalid response buffer, drop the request
1266                 * EIO:    Respond with bad target
1267                 * EAGAIN: Pending request
1268                 */
1269                if (ret == -ENXIO)
1270                        break;
1271                else if (ret == -EIO)
1272                        vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out);
1273        } while (likely(!vhost_exceeds_weight(vq, ++c, 0)));
1274out:
1275        mutex_unlock(&vq->mutex);
1276}
1277
1278static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
1279{
1280        struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1281                                                poll.work);
1282        struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1283
1284        pr_debug("%s: The handling func for control queue.\n", __func__);
1285        vhost_scsi_ctl_handle_vq(vs, vq);
1286}
1287
1288static void
1289vhost_scsi_send_evt(struct vhost_scsi *vs,
1290                   struct vhost_scsi_tpg *tpg,
1291                   struct se_lun *lun,
1292                   u32 event,
1293                   u32 reason)
1294{
1295        struct vhost_scsi_evt *evt;
1296
1297        evt = vhost_scsi_allocate_evt(vs, event, reason);
1298        if (!evt)
1299                return;
1300
1301        if (tpg && lun) {
1302                /* TODO: share lun setup code with virtio-scsi.ko */
1303                /*
1304                 * Note: evt->event is zeroed when we allocate it and
1305                 * lun[4-7] need to be zero according to virtio-scsi spec.
1306                 */
1307                evt->event.lun[0] = 0x01;
1308                evt->event.lun[1] = tpg->tport_tpgt;
1309                if (lun->unpacked_lun >= 256)
1310                        evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
1311                evt->event.lun[3] = lun->unpacked_lun & 0xFF;
1312        }
1313
1314        llist_add(&evt->list, &vs->vs_event_list);
1315        vhost_work_queue(&vs->dev, &vs->vs_event_work);
1316}
1317
1318static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
1319{
1320        struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1321                                                poll.work);
1322        struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1323
1324        mutex_lock(&vq->mutex);
1325        if (!vq->private_data)
1326                goto out;
1327
1328        if (vs->vs_events_missed)
1329                vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
1330out:
1331        mutex_unlock(&vq->mutex);
1332}
1333
1334static void vhost_scsi_handle_kick(struct vhost_work *work)
1335{
1336        struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
1337                                                poll.work);
1338        struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
1339
1340        vhost_scsi_handle_vq(vs, vq);
1341}
1342
1343static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
1344{
1345        vhost_poll_flush(&vs->vqs[index].vq.poll);
1346}
1347
1348/* Callers must hold dev mutex */
1349static void vhost_scsi_flush(struct vhost_scsi *vs)
1350{
1351        struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ];
1352        int i;
1353
1354        /* Init new inflight and remember the old inflight */
1355        vhost_scsi_init_inflight(vs, old_inflight);
1356
1357        /*
1358         * The inflight->kref was initialized to 1. We decrement it here to
1359         * indicate the start of the flush operation so that it will reach 0
1360         * when all the reqs are finished.
1361         */
1362        for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1363                kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight);
1364
1365        /* Flush both the vhost poll and vhost work */
1366        for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1367                vhost_scsi_flush_vq(vs, i);
1368        vhost_work_flush(&vs->dev, &vs->vs_completion_work);
1369        vhost_work_flush(&vs->dev, &vs->vs_event_work);
1370
1371        /* Wait for all reqs issued before the flush to be finished */
1372        for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
1373                wait_for_completion(&old_inflight[i]->comp);
1374}
1375
1376/*
1377 * Called from vhost_scsi_ioctl() context to walk the list of available
1378 * vhost_scsi_tpg with an active struct vhost_scsi_nexus
1379 *
1380 *  The lock nesting rule is:
1381 *    vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
1382 */
1383static int
1384vhost_scsi_set_endpoint(struct vhost_scsi *vs,
1385                        struct vhost_scsi_target *t)
1386{
1387        struct se_portal_group *se_tpg;
1388        struct vhost_scsi_tport *tv_tport;
1389        struct vhost_scsi_tpg *tpg;
1390        struct vhost_scsi_tpg **vs_tpg;
1391        struct vhost_virtqueue *vq;
1392        int index, ret, i, len;
1393        bool match = false;
1394
1395        mutex_lock(&vhost_scsi_mutex);
1396        mutex_lock(&vs->dev.mutex);
1397
1398        /* Verify that ring has been setup correctly. */
1399        for (index = 0; index < vs->dev.nvqs; ++index) {
1400                /* Verify that ring has been setup correctly. */
1401                if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1402                        ret = -EFAULT;
1403                        goto out;
1404                }
1405        }
1406
1407        len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
1408        vs_tpg = kzalloc(len, GFP_KERNEL);
1409        if (!vs_tpg) {
1410                ret = -ENOMEM;
1411                goto out;
1412        }
1413        if (vs->vs_tpg)
1414                memcpy(vs_tpg, vs->vs_tpg, len);
1415
1416        list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) {
1417                mutex_lock(&tpg->tv_tpg_mutex);
1418                if (!tpg->tpg_nexus) {
1419                        mutex_unlock(&tpg->tv_tpg_mutex);
1420                        continue;
1421                }
1422                if (tpg->tv_tpg_vhost_count != 0) {
1423                        mutex_unlock(&tpg->tv_tpg_mutex);
1424                        continue;
1425                }
1426                tv_tport = tpg->tport;
1427
1428                if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1429                        if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) {
1430                                kfree(vs_tpg);
1431                                mutex_unlock(&tpg->tv_tpg_mutex);
1432                                ret = -EEXIST;
1433                                goto out;
1434                        }
1435                        /*
1436                         * In order to ensure individual vhost-scsi configfs
1437                         * groups cannot be removed while in use by vhost ioctl,
1438                         * go ahead and take an explicit se_tpg->tpg_group.cg_item
1439                         * dependency now.
1440                         */
1441                        se_tpg = &tpg->se_tpg;
1442                        ret = target_depend_item(&se_tpg->tpg_group.cg_item);
1443                        if (ret) {
1444                                pr_warn("target_depend_item() failed: %d\n", ret);
1445                                kfree(vs_tpg);
1446                                mutex_unlock(&tpg->tv_tpg_mutex);
1447                                goto out;
1448                        }
1449                        tpg->tv_tpg_vhost_count++;
1450                        tpg->vhost_scsi = vs;
1451                        vs_tpg[tpg->tport_tpgt] = tpg;
1452                        match = true;
1453                }
1454                mutex_unlock(&tpg->tv_tpg_mutex);
1455        }
1456
1457        if (match) {
1458                memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
1459                       sizeof(vs->vs_vhost_wwpn));
1460                for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1461                        vq = &vs->vqs[i].vq;
1462                        mutex_lock(&vq->mutex);
1463                        vq->private_data = vs_tpg;
1464                        vhost_vq_init_access(vq);
1465                        mutex_unlock(&vq->mutex);
1466                }
1467                ret = 0;
1468        } else {
1469                ret = -EEXIST;
1470        }
1471
1472        /*
1473         * Act as synchronize_rcu to make sure access to
1474         * old vs->vs_tpg is finished.
1475         */
1476        vhost_scsi_flush(vs);
1477        kfree(vs->vs_tpg);
1478        vs->vs_tpg = vs_tpg;
1479
1480out:
1481        mutex_unlock(&vs->dev.mutex);
1482        mutex_unlock(&vhost_scsi_mutex);
1483        return ret;
1484}
1485
1486static int
1487vhost_scsi_clear_endpoint(struct vhost_scsi *vs,
1488                          struct vhost_scsi_target *t)
1489{
1490        struct se_portal_group *se_tpg;
1491        struct vhost_scsi_tport *tv_tport;
1492        struct vhost_scsi_tpg *tpg;
1493        struct vhost_virtqueue *vq;
1494        bool match = false;
1495        int index, ret, i;
1496        u8 target;
1497
1498        mutex_lock(&vhost_scsi_mutex);
1499        mutex_lock(&vs->dev.mutex);
1500        /* Verify that ring has been setup correctly. */
1501        for (index = 0; index < vs->dev.nvqs; ++index) {
1502                if (!vhost_vq_access_ok(&vs->vqs[index].vq)) {
1503                        ret = -EFAULT;
1504                        goto err_dev;
1505                }
1506        }
1507
1508        if (!vs->vs_tpg) {
1509                ret = 0;
1510                goto err_dev;
1511        }
1512
1513        for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
1514                target = i;
1515                tpg = vs->vs_tpg[target];
1516                if (!tpg)
1517                        continue;
1518
1519                mutex_lock(&tpg->tv_tpg_mutex);
1520                tv_tport = tpg->tport;
1521                if (!tv_tport) {
1522                        ret = -ENODEV;
1523                        goto err_tpg;
1524                }
1525
1526                if (strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
1527                        pr_warn("tv_tport->tport_name: %s, tpg->tport_tpgt: %hu"
1528                                " does not match t->vhost_wwpn: %s, t->vhost_tpgt: %hu\n",
1529                                tv_tport->tport_name, tpg->tport_tpgt,
1530                                t->vhost_wwpn, t->vhost_tpgt);
1531                        ret = -EINVAL;
1532                        goto err_tpg;
1533                }
1534                tpg->tv_tpg_vhost_count--;
1535                tpg->vhost_scsi = NULL;
1536                vs->vs_tpg[target] = NULL;
1537                match = true;
1538                mutex_unlock(&tpg->tv_tpg_mutex);
1539                /*
1540                 * Release se_tpg->tpg_group.cg_item configfs dependency now
1541                 * to allow vhost-scsi WWPN se_tpg->tpg_group shutdown to occur.
1542                 */
1543                se_tpg = &tpg->se_tpg;
1544                target_undepend_item(&se_tpg->tpg_group.cg_item);
1545        }
1546        if (match) {
1547                for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1548                        vq = &vs->vqs[i].vq;
1549                        mutex_lock(&vq->mutex);
1550                        vq->private_data = NULL;
1551                        mutex_unlock(&vq->mutex);
1552                }
1553        }
1554        /*
1555         * Act as synchronize_rcu to make sure access to
1556         * old vs->vs_tpg is finished.
1557         */
1558        vhost_scsi_flush(vs);
1559        kfree(vs->vs_tpg);
1560        vs->vs_tpg = NULL;
1561        WARN_ON(vs->vs_events_nr);
1562        mutex_unlock(&vs->dev.mutex);
1563        mutex_unlock(&vhost_scsi_mutex);
1564        return 0;
1565
1566err_tpg:
1567        mutex_unlock(&tpg->tv_tpg_mutex);
1568err_dev:
1569        mutex_unlock(&vs->dev.mutex);
1570        mutex_unlock(&vhost_scsi_mutex);
1571        return ret;
1572}
1573
1574static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
1575{
1576        struct vhost_virtqueue *vq;
1577        int i;
1578
1579        if (features & ~VHOST_SCSI_FEATURES)
1580                return -EOPNOTSUPP;
1581
1582        mutex_lock(&vs->dev.mutex);
1583        if ((features & (1 << VHOST_F_LOG_ALL)) &&
1584            !vhost_log_access_ok(&vs->dev)) {
1585                mutex_unlock(&vs->dev.mutex);
1586                return -EFAULT;
1587        }
1588
1589        for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
1590                vq = &vs->vqs[i].vq;
1591                mutex_lock(&vq->mutex);
1592                vq->acked_features = features;
1593                mutex_unlock(&vq->mutex);
1594        }
1595        mutex_unlock(&vs->dev.mutex);
1596        return 0;
1597}
1598
1599static int vhost_scsi_open(struct inode *inode, struct file *f)
1600{
1601        struct vhost_scsi *vs;
1602        struct vhost_virtqueue **vqs;
1603        int r = -ENOMEM, i;
1604
1605        vs = kzalloc(sizeof(*vs), GFP_KERNEL | __GFP_NOWARN | __GFP_RETRY_MAYFAIL);
1606        if (!vs) {
1607                vs = vzalloc(sizeof(*vs));
1608                if (!vs)
1609                        goto err_vs;
1610        }
1611
1612        vqs = kmalloc_array(VHOST_SCSI_MAX_VQ, sizeof(*vqs), GFP_KERNEL);
1613        if (!vqs)
1614                goto err_vqs;
1615
1616        vhost_work_init(&vs->vs_completion_work, vhost_scsi_complete_cmd_work);
1617        vhost_work_init(&vs->vs_event_work, vhost_scsi_evt_work);
1618
1619        vs->vs_events_nr = 0;
1620        vs->vs_events_missed = false;
1621
1622        vqs[VHOST_SCSI_VQ_CTL] = &vs->vqs[VHOST_SCSI_VQ_CTL].vq;
1623        vqs[VHOST_SCSI_VQ_EVT] = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1624        vs->vqs[VHOST_SCSI_VQ_CTL].vq.handle_kick = vhost_scsi_ctl_handle_kick;
1625        vs->vqs[VHOST_SCSI_VQ_EVT].vq.handle_kick = vhost_scsi_evt_handle_kick;
1626        for (i = VHOST_SCSI_VQ_IO; i < VHOST_SCSI_MAX_VQ; i++) {
1627                vqs[i] = &vs->vqs[i].vq;
1628                vs->vqs[i].vq.handle_kick = vhost_scsi_handle_kick;
1629        }
1630        vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV,
1631                       VHOST_SCSI_WEIGHT, 0);
1632
1633        vhost_scsi_init_inflight(vs, NULL);
1634
1635        f->private_data = vs;
1636        return 0;
1637
1638err_vqs:
1639        kvfree(vs);
1640err_vs:
1641        return r;
1642}
1643
1644static int vhost_scsi_release(struct inode *inode, struct file *f)
1645{
1646        struct vhost_scsi *vs = f->private_data;
1647        struct vhost_scsi_target t;
1648
1649        mutex_lock(&vs->dev.mutex);
1650        memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn));
1651        mutex_unlock(&vs->dev.mutex);
1652        vhost_scsi_clear_endpoint(vs, &t);
1653        vhost_dev_stop(&vs->dev);
1654        vhost_dev_cleanup(&vs->dev);
1655        /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
1656        vhost_scsi_flush(vs);
1657        kfree(vs->dev.vqs);
1658        kvfree(vs);
1659        return 0;
1660}
1661
1662static long
1663vhost_scsi_ioctl(struct file *f,
1664                 unsigned int ioctl,
1665                 unsigned long arg)
1666{
1667        struct vhost_scsi *vs = f->private_data;
1668        struct vhost_scsi_target backend;
1669        void __user *argp = (void __user *)arg;
1670        u64 __user *featurep = argp;
1671        u32 __user *eventsp = argp;
1672        u32 events_missed;
1673        u64 features;
1674        int r, abi_version = VHOST_SCSI_ABI_VERSION;
1675        struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1676
1677        switch (ioctl) {
1678        case VHOST_SCSI_SET_ENDPOINT:
1679                if (copy_from_user(&backend, argp, sizeof backend))
1680                        return -EFAULT;
1681                if (backend.reserved != 0)
1682                        return -EOPNOTSUPP;
1683
1684                return vhost_scsi_set_endpoint(vs, &backend);
1685        case VHOST_SCSI_CLEAR_ENDPOINT:
1686                if (copy_from_user(&backend, argp, sizeof backend))
1687                        return -EFAULT;
1688                if (backend.reserved != 0)
1689                        return -EOPNOTSUPP;
1690
1691                return vhost_scsi_clear_endpoint(vs, &backend);
1692        case VHOST_SCSI_GET_ABI_VERSION:
1693                if (copy_to_user(argp, &abi_version, sizeof abi_version))
1694                        return -EFAULT;
1695                return 0;
1696        case VHOST_SCSI_SET_EVENTS_MISSED:
1697                if (get_user(events_missed, eventsp))
1698                        return -EFAULT;
1699                mutex_lock(&vq->mutex);
1700                vs->vs_events_missed = events_missed;
1701                mutex_unlock(&vq->mutex);
1702                return 0;
1703        case VHOST_SCSI_GET_EVENTS_MISSED:
1704                mutex_lock(&vq->mutex);
1705                events_missed = vs->vs_events_missed;
1706                mutex_unlock(&vq->mutex);
1707                if (put_user(events_missed, eventsp))
1708                        return -EFAULT;
1709                return 0;
1710        case VHOST_GET_FEATURES:
1711                features = VHOST_SCSI_FEATURES;
1712                if (copy_to_user(featurep, &features, sizeof features))
1713                        return -EFAULT;
1714                return 0;
1715        case VHOST_SET_FEATURES:
1716                if (copy_from_user(&features, featurep, sizeof features))
1717                        return -EFAULT;
1718                return vhost_scsi_set_features(vs, features);
1719        default:
1720                mutex_lock(&vs->dev.mutex);
1721                r = vhost_dev_ioctl(&vs->dev, ioctl, argp);
1722                /* TODO: flush backend after dev ioctl. */
1723                if (r == -ENOIOCTLCMD)
1724                        r = vhost_vring_ioctl(&vs->dev, ioctl, argp);
1725                mutex_unlock(&vs->dev.mutex);
1726                return r;
1727        }
1728}
1729
1730static const struct file_operations vhost_scsi_fops = {
1731        .owner          = THIS_MODULE,
1732        .release        = vhost_scsi_release,
1733        .unlocked_ioctl = vhost_scsi_ioctl,
1734        .compat_ioctl   = compat_ptr_ioctl,
1735        .open           = vhost_scsi_open,
1736        .llseek         = noop_llseek,
1737};
1738
1739static struct miscdevice vhost_scsi_misc = {
1740        MISC_DYNAMIC_MINOR,
1741        "vhost-scsi",
1742        &vhost_scsi_fops,
1743};
1744
1745static int __init vhost_scsi_register(void)
1746{
1747        return misc_register(&vhost_scsi_misc);
1748}
1749
1750static void vhost_scsi_deregister(void)
1751{
1752        misc_deregister(&vhost_scsi_misc);
1753}
1754
1755static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport)
1756{
1757        switch (tport->tport_proto_id) {
1758        case SCSI_PROTOCOL_SAS:
1759                return "SAS";
1760        case SCSI_PROTOCOL_FCP:
1761                return "FCP";
1762        case SCSI_PROTOCOL_ISCSI:
1763                return "iSCSI";
1764        default:
1765                break;
1766        }
1767
1768        return "Unknown";
1769}
1770
1771static void
1772vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg,
1773                  struct se_lun *lun, bool plug)
1774{
1775
1776        struct vhost_scsi *vs = tpg->vhost_scsi;
1777        struct vhost_virtqueue *vq;
1778        u32 reason;
1779
1780        if (!vs)
1781                return;
1782
1783        mutex_lock(&vs->dev.mutex);
1784
1785        if (plug)
1786                reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
1787        else
1788                reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
1789
1790        vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
1791        mutex_lock(&vq->mutex);
1792        if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG))
1793                vhost_scsi_send_evt(vs, tpg, lun,
1794                                   VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
1795        mutex_unlock(&vq->mutex);
1796        mutex_unlock(&vs->dev.mutex);
1797}
1798
1799static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1800{
1801        vhost_scsi_do_plug(tpg, lun, true);
1802}
1803
1804static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun)
1805{
1806        vhost_scsi_do_plug(tpg, lun, false);
1807}
1808
1809static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
1810                               struct se_lun *lun)
1811{
1812        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1813                                struct vhost_scsi_tpg, se_tpg);
1814
1815        mutex_lock(&vhost_scsi_mutex);
1816
1817        mutex_lock(&tpg->tv_tpg_mutex);
1818        tpg->tv_tpg_port_count++;
1819        mutex_unlock(&tpg->tv_tpg_mutex);
1820
1821        vhost_scsi_hotplug(tpg, lun);
1822
1823        mutex_unlock(&vhost_scsi_mutex);
1824
1825        return 0;
1826}
1827
1828static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
1829                                  struct se_lun *lun)
1830{
1831        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1832                                struct vhost_scsi_tpg, se_tpg);
1833
1834        mutex_lock(&vhost_scsi_mutex);
1835
1836        mutex_lock(&tpg->tv_tpg_mutex);
1837        tpg->tv_tpg_port_count--;
1838        mutex_unlock(&tpg->tv_tpg_mutex);
1839
1840        vhost_scsi_hotunplug(tpg, lun);
1841
1842        mutex_unlock(&vhost_scsi_mutex);
1843}
1844
1845static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess)
1846{
1847        struct vhost_scsi_cmd *tv_cmd;
1848        unsigned int i;
1849
1850        if (!se_sess->sess_cmd_map)
1851                return;
1852
1853        for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1854                tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1855
1856                kfree(tv_cmd->tvc_sgl);
1857                kfree(tv_cmd->tvc_prot_sgl);
1858                kfree(tv_cmd->tvc_upages);
1859        }
1860}
1861
1862static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(
1863                struct config_item *item, const char *page, size_t count)
1864{
1865        struct se_portal_group *se_tpg = attrib_to_tpg(item);
1866        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1867                                struct vhost_scsi_tpg, se_tpg);
1868        unsigned long val;
1869        int ret = kstrtoul(page, 0, &val);
1870
1871        if (ret) {
1872                pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
1873                return ret;
1874        }
1875        if (val != 0 && val != 1 && val != 3) {
1876                pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val);
1877                return -EINVAL;
1878        }
1879        tpg->tv_fabric_prot_type = val;
1880
1881        return count;
1882}
1883
1884static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show(
1885                struct config_item *item, char *page)
1886{
1887        struct se_portal_group *se_tpg = attrib_to_tpg(item);
1888        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
1889                                struct vhost_scsi_tpg, se_tpg);
1890
1891        return sprintf(page, "%d\n", tpg->tv_fabric_prot_type);
1892}
1893
1894CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type);
1895
1896static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = {
1897        &vhost_scsi_tpg_attrib_attr_fabric_prot_type,
1898        NULL,
1899};
1900
1901static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg,
1902                               struct se_session *se_sess, void *p)
1903{
1904        struct vhost_scsi_cmd *tv_cmd;
1905        unsigned int i;
1906
1907        for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) {
1908                tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i];
1909
1910                tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS,
1911                                          sizeof(struct scatterlist),
1912                                          GFP_KERNEL);
1913                if (!tv_cmd->tvc_sgl) {
1914                        pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
1915                        goto out;
1916                }
1917
1918                tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES,
1919                                             sizeof(struct page *),
1920                                             GFP_KERNEL);
1921                if (!tv_cmd->tvc_upages) {
1922                        pr_err("Unable to allocate tv_cmd->tvc_upages\n");
1923                        goto out;
1924                }
1925
1926                tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
1927                                               sizeof(struct scatterlist),
1928                                               GFP_KERNEL);
1929                if (!tv_cmd->tvc_prot_sgl) {
1930                        pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
1931                        goto out;
1932                }
1933        }
1934        return 0;
1935out:
1936        vhost_scsi_free_cmd_map_res(se_sess);
1937        return -ENOMEM;
1938}
1939
1940static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
1941                                const char *name)
1942{
1943        struct vhost_scsi_nexus *tv_nexus;
1944
1945        mutex_lock(&tpg->tv_tpg_mutex);
1946        if (tpg->tpg_nexus) {
1947                mutex_unlock(&tpg->tv_tpg_mutex);
1948                pr_debug("tpg->tpg_nexus already exists\n");
1949                return -EEXIST;
1950        }
1951
1952        tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1953        if (!tv_nexus) {
1954                mutex_unlock(&tpg->tv_tpg_mutex);
1955                pr_err("Unable to allocate struct vhost_scsi_nexus\n");
1956                return -ENOMEM;
1957        }
1958        /*
1959         * Since we are running in 'demo mode' this call with generate a
1960         * struct se_node_acl for the vhost_scsi struct se_portal_group with
1961         * the SCSI Initiator port name of the passed configfs group 'name'.
1962         */
1963        tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg,
1964                                        VHOST_SCSI_DEFAULT_TAGS,
1965                                        sizeof(struct vhost_scsi_cmd),
1966                                        TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
1967                                        (unsigned char *)name, tv_nexus,
1968                                        vhost_scsi_nexus_cb);
1969        if (IS_ERR(tv_nexus->tvn_se_sess)) {
1970                mutex_unlock(&tpg->tv_tpg_mutex);
1971                kfree(tv_nexus);
1972                return -ENOMEM;
1973        }
1974        tpg->tpg_nexus = tv_nexus;
1975
1976        mutex_unlock(&tpg->tv_tpg_mutex);
1977        return 0;
1978}
1979
1980static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg)
1981{
1982        struct se_session *se_sess;
1983        struct vhost_scsi_nexus *tv_nexus;
1984
1985        mutex_lock(&tpg->tv_tpg_mutex);
1986        tv_nexus = tpg->tpg_nexus;
1987        if (!tv_nexus) {
1988                mutex_unlock(&tpg->tv_tpg_mutex);
1989                return -ENODEV;
1990        }
1991
1992        se_sess = tv_nexus->tvn_se_sess;
1993        if (!se_sess) {
1994                mutex_unlock(&tpg->tv_tpg_mutex);
1995                return -ENODEV;
1996        }
1997
1998        if (tpg->tv_tpg_port_count != 0) {
1999                mutex_unlock(&tpg->tv_tpg_mutex);
2000                pr_err("Unable to remove TCM_vhost I_T Nexus with"
2001                        " active TPG port count: %d\n",
2002                        tpg->tv_tpg_port_count);
2003                return -EBUSY;
2004        }
2005
2006        if (tpg->tv_tpg_vhost_count != 0) {
2007                mutex_unlock(&tpg->tv_tpg_mutex);
2008                pr_err("Unable to remove TCM_vhost I_T Nexus with"
2009                        " active TPG vhost count: %d\n",
2010                        tpg->tv_tpg_vhost_count);
2011                return -EBUSY;
2012        }
2013
2014        pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated"
2015                " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport),
2016                tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2017
2018        vhost_scsi_free_cmd_map_res(se_sess);
2019        /*
2020         * Release the SCSI I_T Nexus to the emulated vhost Target Port
2021         */
2022        target_remove_session(se_sess);
2023        tpg->tpg_nexus = NULL;
2024        mutex_unlock(&tpg->tv_tpg_mutex);
2025
2026        kfree(tv_nexus);
2027        return 0;
2028}
2029
2030static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page)
2031{
2032        struct se_portal_group *se_tpg = to_tpg(item);
2033        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2034                                struct vhost_scsi_tpg, se_tpg);
2035        struct vhost_scsi_nexus *tv_nexus;
2036        ssize_t ret;
2037
2038        mutex_lock(&tpg->tv_tpg_mutex);
2039        tv_nexus = tpg->tpg_nexus;
2040        if (!tv_nexus) {
2041                mutex_unlock(&tpg->tv_tpg_mutex);
2042                return -ENODEV;
2043        }
2044        ret = snprintf(page, PAGE_SIZE, "%s\n",
2045                        tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
2046        mutex_unlock(&tpg->tv_tpg_mutex);
2047
2048        return ret;
2049}
2050
2051static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item,
2052                const char *page, size_t count)
2053{
2054        struct se_portal_group *se_tpg = to_tpg(item);
2055        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2056                                struct vhost_scsi_tpg, se_tpg);
2057        struct vhost_scsi_tport *tport_wwn = tpg->tport;
2058        unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr;
2059        int ret;
2060        /*
2061         * Shutdown the active I_T nexus if 'NULL' is passed..
2062         */
2063        if (!strncmp(page, "NULL", 4)) {
2064                ret = vhost_scsi_drop_nexus(tpg);
2065                return (!ret) ? count : ret;
2066        }
2067        /*
2068         * Otherwise make sure the passed virtual Initiator port WWN matches
2069         * the fabric protocol_id set in vhost_scsi_make_tport(), and call
2070         * vhost_scsi_make_nexus().
2071         */
2072        if (strlen(page) >= VHOST_SCSI_NAMELEN) {
2073                pr_err("Emulated NAA Sas Address: %s, exceeds"
2074                                " max: %d\n", page, VHOST_SCSI_NAMELEN);
2075                return -EINVAL;
2076        }
2077        snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page);
2078
2079        ptr = strstr(i_port, "naa.");
2080        if (ptr) {
2081                if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
2082                        pr_err("Passed SAS Initiator Port %s does not"
2083                                " match target port protoid: %s\n", i_port,
2084                                vhost_scsi_dump_proto_id(tport_wwn));
2085                        return -EINVAL;
2086                }
2087                port_ptr = &i_port[0];
2088                goto check_newline;
2089        }
2090        ptr = strstr(i_port, "fc.");
2091        if (ptr) {
2092                if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
2093                        pr_err("Passed FCP Initiator Port %s does not"
2094                                " match target port protoid: %s\n", i_port,
2095                                vhost_scsi_dump_proto_id(tport_wwn));
2096                        return -EINVAL;
2097                }
2098                port_ptr = &i_port[3]; /* Skip over "fc." */
2099                goto check_newline;
2100        }
2101        ptr = strstr(i_port, "iqn.");
2102        if (ptr) {
2103                if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
2104                        pr_err("Passed iSCSI Initiator Port %s does not"
2105                                " match target port protoid: %s\n", i_port,
2106                                vhost_scsi_dump_proto_id(tport_wwn));
2107                        return -EINVAL;
2108                }
2109                port_ptr = &i_port[0];
2110                goto check_newline;
2111        }
2112        pr_err("Unable to locate prefix for emulated Initiator Port:"
2113                        " %s\n", i_port);
2114        return -EINVAL;
2115        /*
2116         * Clear any trailing newline for the NAA WWN
2117         */
2118check_newline:
2119        if (i_port[strlen(i_port)-1] == '\n')
2120                i_port[strlen(i_port)-1] = '\0';
2121
2122        ret = vhost_scsi_make_nexus(tpg, port_ptr);
2123        if (ret < 0)
2124                return ret;
2125
2126        return count;
2127}
2128
2129CONFIGFS_ATTR(vhost_scsi_tpg_, nexus);
2130
2131static struct configfs_attribute *vhost_scsi_tpg_attrs[] = {
2132        &vhost_scsi_tpg_attr_nexus,
2133        NULL,
2134};
2135
2136static struct se_portal_group *
2137vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name)
2138{
2139        struct vhost_scsi_tport *tport = container_of(wwn,
2140                        struct vhost_scsi_tport, tport_wwn);
2141
2142        struct vhost_scsi_tpg *tpg;
2143        u16 tpgt;
2144        int ret;
2145
2146        if (strstr(name, "tpgt_") != name)
2147                return ERR_PTR(-EINVAL);
2148        if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET)
2149                return ERR_PTR(-EINVAL);
2150
2151        tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2152        if (!tpg) {
2153                pr_err("Unable to allocate struct vhost_scsi_tpg");
2154                return ERR_PTR(-ENOMEM);
2155        }
2156        mutex_init(&tpg->tv_tpg_mutex);
2157        INIT_LIST_HEAD(&tpg->tv_tpg_list);
2158        tpg->tport = tport;
2159        tpg->tport_tpgt = tpgt;
2160
2161        ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id);
2162        if (ret < 0) {
2163                kfree(tpg);
2164                return NULL;
2165        }
2166        mutex_lock(&vhost_scsi_mutex);
2167        list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list);
2168        mutex_unlock(&vhost_scsi_mutex);
2169
2170        return &tpg->se_tpg;
2171}
2172
2173static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg)
2174{
2175        struct vhost_scsi_tpg *tpg = container_of(se_tpg,
2176                                struct vhost_scsi_tpg, se_tpg);
2177
2178        mutex_lock(&vhost_scsi_mutex);
2179        list_del(&tpg->tv_tpg_list);
2180        mutex_unlock(&vhost_scsi_mutex);
2181        /*
2182         * Release the virtual I_T Nexus for this vhost TPG
2183         */
2184        vhost_scsi_drop_nexus(tpg);
2185        /*
2186         * Deregister the se_tpg from TCM..
2187         */
2188        core_tpg_deregister(se_tpg);
2189        kfree(tpg);
2190}
2191
2192static struct se_wwn *
2193vhost_scsi_make_tport(struct target_fabric_configfs *tf,
2194                     struct config_group *group,
2195                     const char *name)
2196{
2197        struct vhost_scsi_tport *tport;
2198        char *ptr;
2199        u64 wwpn = 0;
2200        int off = 0;
2201
2202        /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0)
2203                return ERR_PTR(-EINVAL); */
2204
2205        tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2206        if (!tport) {
2207                pr_err("Unable to allocate struct vhost_scsi_tport");
2208                return ERR_PTR(-ENOMEM);
2209        }
2210        tport->tport_wwpn = wwpn;
2211        /*
2212         * Determine the emulated Protocol Identifier and Target Port Name
2213         * based on the incoming configfs directory name.
2214         */
2215        ptr = strstr(name, "naa.");
2216        if (ptr) {
2217                tport->tport_proto_id = SCSI_PROTOCOL_SAS;
2218                goto check_len;
2219        }
2220        ptr = strstr(name, "fc.");
2221        if (ptr) {
2222                tport->tport_proto_id = SCSI_PROTOCOL_FCP;
2223                off = 3; /* Skip over "fc." */
2224                goto check_len;
2225        }
2226        ptr = strstr(name, "iqn.");
2227        if (ptr) {
2228                tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
2229                goto check_len;
2230        }
2231
2232        pr_err("Unable to locate prefix for emulated Target Port:"
2233                        " %s\n", name);
2234        kfree(tport);
2235        return ERR_PTR(-EINVAL);
2236
2237check_len:
2238        if (strlen(name) >= VHOST_SCSI_NAMELEN) {
2239                pr_err("Emulated %s Address: %s, exceeds"
2240                        " max: %d\n", name, vhost_scsi_dump_proto_id(tport),
2241                        VHOST_SCSI_NAMELEN);
2242                kfree(tport);
2243                return ERR_PTR(-EINVAL);
2244        }
2245        snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]);
2246
2247        pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target"
2248                " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name);
2249
2250        return &tport->tport_wwn;
2251}
2252
2253static void vhost_scsi_drop_tport(struct se_wwn *wwn)
2254{
2255        struct vhost_scsi_tport *tport = container_of(wwn,
2256                                struct vhost_scsi_tport, tport_wwn);
2257
2258        pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target"
2259                " %s Address: %s\n", vhost_scsi_dump_proto_id(tport),
2260                tport->tport_name);
2261
2262        kfree(tport);
2263}
2264
2265static ssize_t
2266vhost_scsi_wwn_version_show(struct config_item *item, char *page)
2267{
2268        return sprintf(page, "TCM_VHOST fabric module %s on %s/%s"
2269                "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2270                utsname()->machine);
2271}
2272
2273CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version);
2274
2275static struct configfs_attribute *vhost_scsi_wwn_attrs[] = {
2276        &vhost_scsi_wwn_attr_version,
2277        NULL,
2278};
2279
2280static const struct target_core_fabric_ops vhost_scsi_ops = {
2281        .module                         = THIS_MODULE,
2282        .fabric_name                    = "vhost",
2283        .tpg_get_wwn                    = vhost_scsi_get_fabric_wwn,
2284        .tpg_get_tag                    = vhost_scsi_get_tpgt,
2285        .tpg_check_demo_mode            = vhost_scsi_check_true,
2286        .tpg_check_demo_mode_cache      = vhost_scsi_check_true,
2287        .tpg_check_demo_mode_write_protect = vhost_scsi_check_false,
2288        .tpg_check_prod_mode_write_protect = vhost_scsi_check_false,
2289        .tpg_check_prot_fabric_only     = vhost_scsi_check_prot_fabric_only,
2290        .tpg_get_inst_index             = vhost_scsi_tpg_get_inst_index,
2291        .release_cmd                    = vhost_scsi_release_cmd,
2292        .check_stop_free                = vhost_scsi_check_stop_free,
2293        .sess_get_index                 = vhost_scsi_sess_get_index,
2294        .sess_get_initiator_sid         = NULL,
2295        .write_pending                  = vhost_scsi_write_pending,
2296        .set_default_node_attributes    = vhost_scsi_set_default_node_attrs,
2297        .get_cmd_state                  = vhost_scsi_get_cmd_state,
2298        .queue_data_in                  = vhost_scsi_queue_data_in,
2299        .queue_status                   = vhost_scsi_queue_status,
2300        .queue_tm_rsp                   = vhost_scsi_queue_tm_rsp,
2301        .aborted_task                   = vhost_scsi_aborted_task,
2302        /*
2303         * Setup callers for generic logic in target_core_fabric_configfs.c
2304         */
2305        .fabric_make_wwn                = vhost_scsi_make_tport,
2306        .fabric_drop_wwn                = vhost_scsi_drop_tport,
2307        .fabric_make_tpg                = vhost_scsi_make_tpg,
2308        .fabric_drop_tpg                = vhost_scsi_drop_tpg,
2309        .fabric_post_link               = vhost_scsi_port_link,
2310        .fabric_pre_unlink              = vhost_scsi_port_unlink,
2311
2312        .tfc_wwn_attrs                  = vhost_scsi_wwn_attrs,
2313        .tfc_tpg_base_attrs             = vhost_scsi_tpg_attrs,
2314        .tfc_tpg_attrib_attrs           = vhost_scsi_tpg_attrib_attrs,
2315};
2316
2317static int __init vhost_scsi_init(void)
2318{
2319        int ret = -ENOMEM;
2320
2321        pr_debug("TCM_VHOST fabric module %s on %s/%s"
2322                " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
2323                utsname()->machine);
2324
2325        /*
2326         * Use our own dedicated workqueue for submitting I/O into
2327         * target core to avoid contention within system_wq.
2328         */
2329        vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
2330        if (!vhost_scsi_workqueue)
2331                goto out;
2332
2333        ret = vhost_scsi_register();
2334        if (ret < 0)
2335                goto out_destroy_workqueue;
2336
2337        ret = target_register_template(&vhost_scsi_ops);
2338        if (ret < 0)
2339                goto out_vhost_scsi_deregister;
2340
2341        return 0;
2342
2343out_vhost_scsi_deregister:
2344        vhost_scsi_deregister();
2345out_destroy_workqueue:
2346        destroy_workqueue(vhost_scsi_workqueue);
2347out:
2348        return ret;
2349};
2350
2351static void vhost_scsi_exit(void)
2352{
2353        target_unregister_template(&vhost_scsi_ops);
2354        vhost_scsi_deregister();
2355        destroy_workqueue(vhost_scsi_workqueue);
2356};
2357
2358MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");
2359MODULE_ALIAS("tcm_vhost");
2360MODULE_LICENSE("GPL");
2361module_init(vhost_scsi_init);
2362module_exit(vhost_scsi_exit);
2363