| 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 | struct vhost_scsi_inflight { |
| 61 | /* Wait for the flush operation to finish */ |
| 62 | struct completion comp; |
| 63 | /* Refcount for the inflight reqs */ |
| 64 | struct kref kref; |
| 65 | }; |
| 66 | |
| 67 | struct vhost_scsi_cmd { |
| 68 | /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ |
| 69 | int tvc_vq_desc; |
| 70 | /* virtio-scsi initiator task attribute */ |
| 71 | int tvc_task_attr; |
| 72 | /* virtio-scsi response incoming iovecs */ |
| 73 | int tvc_in_iovs; |
| 74 | /* virtio-scsi initiator data direction */ |
| 75 | enum dma_data_direction tvc_data_direction; |
| 76 | /* Expected data transfer length from virtio-scsi header */ |
| 77 | u32 tvc_exp_data_len; |
| 78 | /* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */ |
| 79 | u64 tvc_tag; |
| 80 | /* The number of scatterlists associated with this cmd */ |
| 81 | u32 tvc_sgl_count; |
| 82 | u32 tvc_prot_sgl_count; |
| 83 | /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */ |
| 84 | u32 tvc_lun; |
| 85 | /* Pointer to the SGL formatted memory from virtio-scsi */ |
| 86 | struct scatterlist *tvc_sgl; |
| 87 | struct scatterlist *tvc_prot_sgl; |
| 88 | struct page **tvc_upages; |
| 89 | /* Pointer to response header iovec */ |
| 90 | struct iovec tvc_resp_iov; |
| 91 | /* Pointer to vhost_scsi for our device */ |
| 92 | struct vhost_scsi *tvc_vhost; |
| 93 | /* Pointer to vhost_virtqueue for the cmd */ |
| 94 | struct vhost_virtqueue *tvc_vq; |
| 95 | /* Pointer to vhost nexus memory */ |
| 96 | struct vhost_scsi_nexus *tvc_nexus; |
| 97 | /* The TCM I/O descriptor that is accessed via container_of() */ |
| 98 | struct se_cmd tvc_se_cmd; |
| 99 | /* work item used for cmwq dispatch to vhost_scsi_submission_work() */ |
| 100 | struct work_struct work; |
| 101 | /* Copy of the incoming SCSI command descriptor block (CDB) */ |
| 102 | unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE]; |
| 103 | /* Sense buffer that will be mapped into outgoing status */ |
| 104 | unsigned char tvc_sense_buf[TRANSPORT_SENSE_BUFFER]; |
| 105 | /* Completed commands list, serviced from vhost worker thread */ |
| 106 | struct llist_node tvc_completion_list; |
| 107 | /* Used to track inflight cmd */ |
| 108 | struct vhost_scsi_inflight *inflight; |
| 109 | }; |
| 110 | |
| 111 | struct vhost_scsi_nexus { |
| 112 | /* Pointer to TCM session for I_T Nexus */ |
| 113 | struct se_session *tvn_se_sess; |
| 114 | }; |
| 115 | |
| 116 | struct vhost_scsi_tpg { |
| 117 | /* Vhost port target portal group tag for TCM */ |
| 118 | u16 tport_tpgt; |
| 119 | /* Used to track number of TPG Port/Lun Links wrt to explict I_T Nexus shutdown */ |
| 120 | int tv_tpg_port_count; |
| 121 | /* Used for vhost_scsi device reference to tpg_nexus, protected by tv_tpg_mutex */ |
| 122 | int tv_tpg_vhost_count; |
| 123 | /* Used for enabling T10-PI with legacy devices */ |
| 124 | int tv_fabric_prot_type; |
| 125 | /* list for vhost_scsi_list */ |
| 126 | struct list_head tv_tpg_list; |
| 127 | /* Used to protect access for tpg_nexus */ |
| 128 | struct mutex tv_tpg_mutex; |
| 129 | /* Pointer to the TCM VHost I_T Nexus for this TPG endpoint */ |
| 130 | struct vhost_scsi_nexus *tpg_nexus; |
| 131 | /* Pointer back to vhost_scsi_tport */ |
| 132 | struct vhost_scsi_tport *tport; |
| 133 | /* Returned by vhost_scsi_make_tpg() */ |
| 134 | struct se_portal_group se_tpg; |
| 135 | /* Pointer back to vhost_scsi, protected by tv_tpg_mutex */ |
| 136 | struct vhost_scsi *vhost_scsi; |
| 137 | }; |
| 138 | |
| 139 | struct vhost_scsi_tport { |
| 140 | /* SCSI protocol the tport is providing */ |
| 141 | u8 tport_proto_id; |
| 142 | /* Binary World Wide unique Port Name for Vhost Target port */ |
| 143 | u64 tport_wwpn; |
| 144 | /* ASCII formatted WWPN for Vhost Target port */ |
| 145 | char tport_name[VHOST_SCSI_NAMELEN]; |
| 146 | /* Returned by vhost_scsi_make_tport() */ |
| 147 | struct se_wwn tport_wwn; |
| 148 | }; |
| 149 | |
| 150 | struct vhost_scsi_evt { |
| 151 | /* event to be sent to guest */ |
| 152 | struct virtio_scsi_event event; |
| 153 | /* event list, serviced from vhost worker thread */ |
| 154 | struct llist_node list; |
| 155 | }; |
| 156 | |
| 157 | enum { |
| 158 | VHOST_SCSI_VQ_CTL = 0, |
| 159 | VHOST_SCSI_VQ_EVT = 1, |
| 160 | VHOST_SCSI_VQ_IO = 2, |
| 161 | }; |
| 162 | |
| 163 | /* Note: can't set VIRTIO_F_VERSION_1 yet, since that implies ANY_LAYOUT. */ |
| 164 | enum { |
| 165 | VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) | |
| 166 | (1ULL << VIRTIO_SCSI_F_T10_PI) |
| 167 | }; |
| 168 | |
| 169 | #define VHOST_SCSI_MAX_TARGET 256 |
| 170 | #define VHOST_SCSI_MAX_VQ 128 |
| 171 | #define VHOST_SCSI_MAX_EVENT 128 |
| 172 | |
| 173 | struct vhost_scsi_virtqueue { |
| 174 | struct vhost_virtqueue vq; |
| 175 | /* |
| 176 | * Reference counting for inflight reqs, used for flush operation. At |
| 177 | * each time, one reference tracks new commands submitted, while we |
| 178 | * wait for another one to reach 0. |
| 179 | */ |
| 180 | struct vhost_scsi_inflight inflights[2]; |
| 181 | /* |
| 182 | * Indicate current inflight in use, protected by vq->mutex. |
| 183 | * Writers must also take dev mutex and flush under it. |
| 184 | */ |
| 185 | int inflight_idx; |
| 186 | }; |
| 187 | |
| 188 | struct vhost_scsi { |
| 189 | /* Protected by vhost_scsi->dev.mutex */ |
| 190 | struct vhost_scsi_tpg **vs_tpg; |
| 191 | char vs_vhost_wwpn[TRANSPORT_IQN_LEN]; |
| 192 | |
| 193 | struct vhost_dev dev; |
| 194 | struct vhost_scsi_virtqueue vqs[VHOST_SCSI_MAX_VQ]; |
| 195 | |
| 196 | struct vhost_work vs_completion_work; /* cmd completion work item */ |
| 197 | struct llist_head vs_completion_list; /* cmd completion queue */ |
| 198 | |
| 199 | struct vhost_work vs_event_work; /* evt injection work item */ |
| 200 | struct llist_head vs_event_list; /* evt injection queue */ |
| 201 | |
| 202 | bool vs_events_missed; /* any missed events, protected by vq->mutex */ |
| 203 | int vs_events_nr; /* num of pending events, protected by vq->mutex */ |
| 204 | }; |
| 205 | |
| 206 | /* |
| 207 | * Context for processing request and control queue operations. |
| 208 | */ |
| 209 | struct vhost_scsi_ctx { |
| 210 | int head; |
| 211 | unsigned int out, in; |
| 212 | size_t req_size, rsp_size; |
| 213 | size_t out_size, in_size; |
| 214 | u8 *target, *lunp; |
| 215 | void *req; |
| 216 | struct iov_iter out_iter; |
| 217 | }; |
| 218 | |
| 219 | static struct workqueue_struct *vhost_scsi_workqueue; |
| 220 | |
| 221 | /* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */ |
| 222 | static DEFINE_MUTEX(vhost_scsi_mutex); |
| 223 | static LIST_HEAD(vhost_scsi_list); |
| 224 | |
| 225 | static void vhost_scsi_done_inflight(struct kref *kref) |
| 226 | { |
| 227 | struct vhost_scsi_inflight *inflight; |
| 228 | |
| 229 | inflight = container_of(kref, struct vhost_scsi_inflight, kref); |
| 230 | complete(&inflight->comp); |
| 231 | } |
| 232 | |
| 233 | static void vhost_scsi_init_inflight(struct vhost_scsi *vs, |
| 234 | struct vhost_scsi_inflight *old_inflight[]) |
| 235 | { |
| 236 | struct vhost_scsi_inflight *new_inflight; |
| 237 | struct vhost_virtqueue *vq; |
| 238 | int idx, i; |
| 239 | |
| 240 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) { |
| 241 | vq = &vs->vqs[i].vq; |
| 242 | |
| 243 | mutex_lock(&vq->mutex); |
| 244 | |
| 245 | /* store old infight */ |
| 246 | idx = vs->vqs[i].inflight_idx; |
| 247 | if (old_inflight) |
| 248 | old_inflight[i] = &vs->vqs[i].inflights[idx]; |
| 249 | |
| 250 | /* setup new infight */ |
| 251 | vs->vqs[i].inflight_idx = idx ^ 1; |
| 252 | new_inflight = &vs->vqs[i].inflights[idx ^ 1]; |
| 253 | kref_init(&new_inflight->kref); |
| 254 | init_completion(&new_inflight->comp); |
| 255 | |
| 256 | mutex_unlock(&vq->mutex); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | static struct vhost_scsi_inflight * |
| 261 | vhost_scsi_get_inflight(struct vhost_virtqueue *vq) |
| 262 | { |
| 263 | struct vhost_scsi_inflight *inflight; |
| 264 | struct vhost_scsi_virtqueue *svq; |
| 265 | |
| 266 | svq = container_of(vq, struct vhost_scsi_virtqueue, vq); |
| 267 | inflight = &svq->inflights[svq->inflight_idx]; |
| 268 | kref_get(&inflight->kref); |
| 269 | |
| 270 | return inflight; |
| 271 | } |
| 272 | |
| 273 | static void vhost_scsi_put_inflight(struct vhost_scsi_inflight *inflight) |
| 274 | { |
| 275 | kref_put(&inflight->kref, vhost_scsi_done_inflight); |
| 276 | } |
| 277 | |
| 278 | static int vhost_scsi_check_true(struct se_portal_group *se_tpg) |
| 279 | { |
| 280 | return 1; |
| 281 | } |
| 282 | |
| 283 | static int vhost_scsi_check_false(struct se_portal_group *se_tpg) |
| 284 | { |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static char *vhost_scsi_get_fabric_wwn(struct se_portal_group *se_tpg) |
| 289 | { |
| 290 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 291 | struct vhost_scsi_tpg, se_tpg); |
| 292 | struct vhost_scsi_tport *tport = tpg->tport; |
| 293 | |
| 294 | return &tport->tport_name[0]; |
| 295 | } |
| 296 | |
| 297 | static u16 vhost_scsi_get_tpgt(struct se_portal_group *se_tpg) |
| 298 | { |
| 299 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 300 | struct vhost_scsi_tpg, se_tpg); |
| 301 | return tpg->tport_tpgt; |
| 302 | } |
| 303 | |
| 304 | static int vhost_scsi_check_prot_fabric_only(struct se_portal_group *se_tpg) |
| 305 | { |
| 306 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 307 | struct vhost_scsi_tpg, se_tpg); |
| 308 | |
| 309 | return tpg->tv_fabric_prot_type; |
| 310 | } |
| 311 | |
| 312 | static u32 vhost_scsi_tpg_get_inst_index(struct se_portal_group *se_tpg) |
| 313 | { |
| 314 | return 1; |
| 315 | } |
| 316 | |
| 317 | static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) |
| 318 | { |
| 319 | struct vhost_scsi_cmd *tv_cmd = container_of(se_cmd, |
| 320 | struct vhost_scsi_cmd, tvc_se_cmd); |
| 321 | struct se_session *se_sess = tv_cmd->tvc_nexus->tvn_se_sess; |
| 322 | int i; |
| 323 | |
| 324 | if (tv_cmd->tvc_sgl_count) { |
| 325 | for (i = 0; i < tv_cmd->tvc_sgl_count; i++) |
| 326 | put_page(sg_page(&tv_cmd->tvc_sgl[i])); |
| 327 | } |
| 328 | if (tv_cmd->tvc_prot_sgl_count) { |
| 329 | for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++) |
| 330 | put_page(sg_page(&tv_cmd->tvc_prot_sgl[i])); |
| 331 | } |
| 332 | |
| 333 | vhost_scsi_put_inflight(tv_cmd->inflight); |
| 334 | target_free_tag(se_sess, se_cmd); |
| 335 | } |
| 336 | |
| 337 | static u32 vhost_scsi_sess_get_index(struct se_session *se_sess) |
| 338 | { |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | static int vhost_scsi_write_pending(struct se_cmd *se_cmd) |
| 343 | { |
| 344 | /* Go ahead and process the write immediately */ |
| 345 | target_execute_cmd(se_cmd); |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static int vhost_scsi_write_pending_status(struct se_cmd *se_cmd) |
| 350 | { |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl) |
| 355 | { |
| 356 | return; |
| 357 | } |
| 358 | |
| 359 | static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd) |
| 360 | { |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | static void vhost_scsi_complete_cmd(struct vhost_scsi_cmd *cmd) |
| 365 | { |
| 366 | struct vhost_scsi *vs = cmd->tvc_vhost; |
| 367 | |
| 368 | llist_add(&cmd->tvc_completion_list, &vs->vs_completion_list); |
| 369 | |
| 370 | vhost_work_queue(&vs->dev, &vs->vs_completion_work); |
| 371 | } |
| 372 | |
| 373 | static int vhost_scsi_queue_data_in(struct se_cmd *se_cmd) |
| 374 | { |
| 375 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
| 376 | struct vhost_scsi_cmd, tvc_se_cmd); |
| 377 | vhost_scsi_complete_cmd(cmd); |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static int vhost_scsi_queue_status(struct se_cmd *se_cmd) |
| 382 | { |
| 383 | struct vhost_scsi_cmd *cmd = container_of(se_cmd, |
| 384 | struct vhost_scsi_cmd, tvc_se_cmd); |
| 385 | vhost_scsi_complete_cmd(cmd); |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | static void vhost_scsi_queue_tm_rsp(struct se_cmd *se_cmd) |
| 390 | { |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | static void vhost_scsi_aborted_task(struct se_cmd *se_cmd) |
| 395 | { |
| 396 | return; |
| 397 | } |
| 398 | |
| 399 | static void vhost_scsi_free_evt(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
| 400 | { |
| 401 | vs->vs_events_nr--; |
| 402 | kfree(evt); |
| 403 | } |
| 404 | |
| 405 | static struct vhost_scsi_evt * |
| 406 | vhost_scsi_allocate_evt(struct vhost_scsi *vs, |
| 407 | u32 event, u32 reason) |
| 408 | { |
| 409 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
| 410 | struct vhost_scsi_evt *evt; |
| 411 | |
| 412 | if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) { |
| 413 | vs->vs_events_missed = true; |
| 414 | return NULL; |
| 415 | } |
| 416 | |
| 417 | evt = kzalloc(sizeof(*evt), GFP_KERNEL); |
| 418 | if (!evt) { |
| 419 | vq_err(vq, "Failed to allocate vhost_scsi_evt\n"); |
| 420 | vs->vs_events_missed = true; |
| 421 | return NULL; |
| 422 | } |
| 423 | |
| 424 | evt->event.event = cpu_to_vhost32(vq, event); |
| 425 | evt->event.reason = cpu_to_vhost32(vq, reason); |
| 426 | vs->vs_events_nr++; |
| 427 | |
| 428 | return evt; |
| 429 | } |
| 430 | |
| 431 | static void vhost_scsi_free_cmd(struct vhost_scsi_cmd *cmd) |
| 432 | { |
| 433 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
| 434 | |
| 435 | /* TODO locking against target/backend threads? */ |
| 436 | transport_generic_free_cmd(se_cmd, 0); |
| 437 | |
| 438 | } |
| 439 | |
| 440 | static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) |
| 441 | { |
| 442 | return target_put_sess_cmd(se_cmd); |
| 443 | } |
| 444 | |
| 445 | static void |
| 446 | vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) |
| 447 | { |
| 448 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
| 449 | struct virtio_scsi_event *event = &evt->event; |
| 450 | struct virtio_scsi_event __user *eventp; |
| 451 | unsigned out, in; |
| 452 | int head, ret; |
| 453 | |
| 454 | if (!vq->private_data) { |
| 455 | vs->vs_events_missed = true; |
| 456 | return; |
| 457 | } |
| 458 | |
| 459 | again: |
| 460 | vhost_disable_notify(&vs->dev, vq); |
| 461 | head = vhost_get_vq_desc(vq, vq->iov, |
| 462 | ARRAY_SIZE(vq->iov), &out, &in, |
| 463 | NULL, NULL); |
| 464 | if (head < 0) { |
| 465 | vs->vs_events_missed = true; |
| 466 | return; |
| 467 | } |
| 468 | if (head == vq->num) { |
| 469 | if (vhost_enable_notify(&vs->dev, vq)) |
| 470 | goto again; |
| 471 | vs->vs_events_missed = true; |
| 472 | return; |
| 473 | } |
| 474 | |
| 475 | if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) { |
| 476 | vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n", |
| 477 | vq->iov[out].iov_len); |
| 478 | vs->vs_events_missed = true; |
| 479 | return; |
| 480 | } |
| 481 | |
| 482 | if (vs->vs_events_missed) { |
| 483 | event->event |= cpu_to_vhost32(vq, VIRTIO_SCSI_T_EVENTS_MISSED); |
| 484 | vs->vs_events_missed = false; |
| 485 | } |
| 486 | |
| 487 | eventp = vq->iov[out].iov_base; |
| 488 | ret = __copy_to_user(eventp, event, sizeof(*event)); |
| 489 | if (!ret) |
| 490 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); |
| 491 | else |
| 492 | vq_err(vq, "Faulted on vhost_scsi_send_event\n"); |
| 493 | } |
| 494 | |
| 495 | static void vhost_scsi_evt_work(struct vhost_work *work) |
| 496 | { |
| 497 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, |
| 498 | vs_event_work); |
| 499 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
| 500 | struct vhost_scsi_evt *evt, *t; |
| 501 | struct llist_node *llnode; |
| 502 | |
| 503 | mutex_lock(&vq->mutex); |
| 504 | llnode = llist_del_all(&vs->vs_event_list); |
| 505 | llist_for_each_entry_safe(evt, t, llnode, list) { |
| 506 | vhost_scsi_do_evt_work(vs, evt); |
| 507 | vhost_scsi_free_evt(vs, evt); |
| 508 | } |
| 509 | mutex_unlock(&vq->mutex); |
| 510 | } |
| 511 | |
| 512 | /* Fill in status and signal that we are done processing this command |
| 513 | * |
| 514 | * This is scheduled in the vhost work queue so we are called with the owner |
| 515 | * process mm and can access the vring. |
| 516 | */ |
| 517 | static void vhost_scsi_complete_cmd_work(struct vhost_work *work) |
| 518 | { |
| 519 | struct vhost_scsi *vs = container_of(work, struct vhost_scsi, |
| 520 | vs_completion_work); |
| 521 | DECLARE_BITMAP(signal, VHOST_SCSI_MAX_VQ); |
| 522 | struct virtio_scsi_cmd_resp v_rsp; |
| 523 | struct vhost_scsi_cmd *cmd, *t; |
| 524 | struct llist_node *llnode; |
| 525 | struct se_cmd *se_cmd; |
| 526 | struct iov_iter iov_iter; |
| 527 | int ret, vq; |
| 528 | |
| 529 | bitmap_zero(signal, VHOST_SCSI_MAX_VQ); |
| 530 | llnode = llist_del_all(&vs->vs_completion_list); |
| 531 | llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) { |
| 532 | se_cmd = &cmd->tvc_se_cmd; |
| 533 | |
| 534 | pr_debug("%s tv_cmd %p resid %u status %#02x\n", __func__, |
| 535 | cmd, se_cmd->residual_count, se_cmd->scsi_status); |
| 536 | |
| 537 | memset(&v_rsp, 0, sizeof(v_rsp)); |
| 538 | v_rsp.resid = cpu_to_vhost32(cmd->tvc_vq, se_cmd->residual_count); |
| 539 | /* TODO is status_qualifier field needed? */ |
| 540 | v_rsp.status = se_cmd->scsi_status; |
| 541 | v_rsp.sense_len = cpu_to_vhost32(cmd->tvc_vq, |
| 542 | se_cmd->scsi_sense_length); |
| 543 | memcpy(v_rsp.sense, cmd->tvc_sense_buf, |
| 544 | se_cmd->scsi_sense_length); |
| 545 | |
| 546 | iov_iter_init(&iov_iter, READ, &cmd->tvc_resp_iov, |
| 547 | cmd->tvc_in_iovs, sizeof(v_rsp)); |
| 548 | ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); |
| 549 | if (likely(ret == sizeof(v_rsp))) { |
| 550 | struct vhost_scsi_virtqueue *q; |
| 551 | vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); |
| 552 | q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); |
| 553 | vq = q - vs->vqs; |
| 554 | __set_bit(vq, signal); |
| 555 | } else |
| 556 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
| 557 | |
| 558 | vhost_scsi_free_cmd(cmd); |
| 559 | } |
| 560 | |
| 561 | vq = -1; |
| 562 | while ((vq = find_next_bit(signal, VHOST_SCSI_MAX_VQ, vq + 1)) |
| 563 | < VHOST_SCSI_MAX_VQ) |
| 564 | vhost_signal(&vs->dev, &vs->vqs[vq].vq); |
| 565 | } |
| 566 | |
| 567 | static struct vhost_scsi_cmd * |
| 568 | vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct vhost_scsi_tpg *tpg, |
| 569 | unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr, |
| 570 | u32 exp_data_len, int data_direction) |
| 571 | { |
| 572 | struct vhost_scsi_cmd *cmd; |
| 573 | struct vhost_scsi_nexus *tv_nexus; |
| 574 | struct se_session *se_sess; |
| 575 | struct scatterlist *sg, *prot_sg; |
| 576 | struct page **pages; |
| 577 | int tag, cpu; |
| 578 | |
| 579 | tv_nexus = tpg->tpg_nexus; |
| 580 | if (!tv_nexus) { |
| 581 | pr_err("Unable to locate active struct vhost_scsi_nexus\n"); |
| 582 | return ERR_PTR(-EIO); |
| 583 | } |
| 584 | se_sess = tv_nexus->tvn_se_sess; |
| 585 | |
| 586 | tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
| 587 | if (tag < 0) { |
| 588 | pr_err("Unable to obtain tag for vhost_scsi_cmd\n"); |
| 589 | return ERR_PTR(-ENOMEM); |
| 590 | } |
| 591 | |
| 592 | cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[tag]; |
| 593 | sg = cmd->tvc_sgl; |
| 594 | prot_sg = cmd->tvc_prot_sgl; |
| 595 | pages = cmd->tvc_upages; |
| 596 | memset(cmd, 0, sizeof(*cmd)); |
| 597 | cmd->tvc_sgl = sg; |
| 598 | cmd->tvc_prot_sgl = prot_sg; |
| 599 | cmd->tvc_upages = pages; |
| 600 | cmd->tvc_se_cmd.map_tag = tag; |
| 601 | cmd->tvc_se_cmd.map_cpu = cpu; |
| 602 | cmd->tvc_tag = scsi_tag; |
| 603 | cmd->tvc_lun = lun; |
| 604 | cmd->tvc_task_attr = task_attr; |
| 605 | cmd->tvc_exp_data_len = exp_data_len; |
| 606 | cmd->tvc_data_direction = data_direction; |
| 607 | cmd->tvc_nexus = tv_nexus; |
| 608 | cmd->inflight = vhost_scsi_get_inflight(vq); |
| 609 | |
| 610 | memcpy(cmd->tvc_cdb, cdb, VHOST_SCSI_MAX_CDB_SIZE); |
| 611 | |
| 612 | return cmd; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Map a user memory range into a scatterlist |
| 617 | * |
| 618 | * Returns the number of scatterlist entries used or -errno on error. |
| 619 | */ |
| 620 | static int |
| 621 | vhost_scsi_map_to_sgl(struct vhost_scsi_cmd *cmd, |
| 622 | struct iov_iter *iter, |
| 623 | struct scatterlist *sgl, |
| 624 | bool write) |
| 625 | { |
| 626 | struct page **pages = cmd->tvc_upages; |
| 627 | struct scatterlist *sg = sgl; |
| 628 | ssize_t bytes; |
| 629 | size_t offset; |
| 630 | unsigned int npages = 0; |
| 631 | |
| 632 | bytes = iov_iter_get_pages(iter, pages, LONG_MAX, |
| 633 | VHOST_SCSI_PREALLOC_UPAGES, &offset); |
| 634 | /* No pages were pinned */ |
| 635 | if (bytes <= 0) |
| 636 | return bytes < 0 ? bytes : -EFAULT; |
| 637 | |
| 638 | iov_iter_advance(iter, bytes); |
| 639 | |
| 640 | while (bytes) { |
| 641 | unsigned n = min_t(unsigned, PAGE_SIZE - offset, bytes); |
| 642 | sg_set_page(sg++, pages[npages++], n, offset); |
| 643 | bytes -= n; |
| 644 | offset = 0; |
| 645 | } |
| 646 | return npages; |
| 647 | } |
| 648 | |
| 649 | static int |
| 650 | vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls) |
| 651 | { |
| 652 | int sgl_count = 0; |
| 653 | |
| 654 | if (!iter || !iter->iov) { |
| 655 | pr_err("%s: iter->iov is NULL, but expected bytes: %zu" |
| 656 | " present\n", __func__, bytes); |
| 657 | return -EINVAL; |
| 658 | } |
| 659 | |
| 660 | sgl_count = iov_iter_npages(iter, 0xffff); |
| 661 | if (sgl_count > max_sgls) { |
| 662 | pr_err("%s: requested sgl_count: %d exceeds pre-allocated" |
| 663 | " max_sgls: %d\n", __func__, sgl_count, max_sgls); |
| 664 | return -EINVAL; |
| 665 | } |
| 666 | return sgl_count; |
| 667 | } |
| 668 | |
| 669 | static int |
| 670 | vhost_scsi_iov_to_sgl(struct vhost_scsi_cmd *cmd, bool write, |
| 671 | struct iov_iter *iter, |
| 672 | struct scatterlist *sg, int sg_count) |
| 673 | { |
| 674 | struct scatterlist *p = sg; |
| 675 | int ret; |
| 676 | |
| 677 | while (iov_iter_count(iter)) { |
| 678 | ret = vhost_scsi_map_to_sgl(cmd, iter, sg, write); |
| 679 | if (ret < 0) { |
| 680 | while (p < sg) { |
| 681 | struct page *page = sg_page(p++); |
| 682 | if (page) |
| 683 | put_page(page); |
| 684 | } |
| 685 | return ret; |
| 686 | } |
| 687 | sg += ret; |
| 688 | } |
| 689 | return 0; |
| 690 | } |
| 691 | |
| 692 | static int |
| 693 | vhost_scsi_mapal(struct vhost_scsi_cmd *cmd, |
| 694 | size_t prot_bytes, struct iov_iter *prot_iter, |
| 695 | size_t data_bytes, struct iov_iter *data_iter) |
| 696 | { |
| 697 | int sgl_count, ret; |
| 698 | bool write = (cmd->tvc_data_direction == DMA_FROM_DEVICE); |
| 699 | |
| 700 | if (prot_bytes) { |
| 701 | sgl_count = vhost_scsi_calc_sgls(prot_iter, prot_bytes, |
| 702 | VHOST_SCSI_PREALLOC_PROT_SGLS); |
| 703 | if (sgl_count < 0) |
| 704 | return sgl_count; |
| 705 | |
| 706 | sg_init_table(cmd->tvc_prot_sgl, sgl_count); |
| 707 | cmd->tvc_prot_sgl_count = sgl_count; |
| 708 | pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__, |
| 709 | cmd->tvc_prot_sgl, cmd->tvc_prot_sgl_count); |
| 710 | |
| 711 | ret = vhost_scsi_iov_to_sgl(cmd, write, prot_iter, |
| 712 | cmd->tvc_prot_sgl, |
| 713 | cmd->tvc_prot_sgl_count); |
| 714 | if (ret < 0) { |
| 715 | cmd->tvc_prot_sgl_count = 0; |
| 716 | return ret; |
| 717 | } |
| 718 | } |
| 719 | sgl_count = vhost_scsi_calc_sgls(data_iter, data_bytes, |
| 720 | VHOST_SCSI_PREALLOC_SGLS); |
| 721 | if (sgl_count < 0) |
| 722 | return sgl_count; |
| 723 | |
| 724 | sg_init_table(cmd->tvc_sgl, sgl_count); |
| 725 | cmd->tvc_sgl_count = sgl_count; |
| 726 | pr_debug("%s data_sg %p data_sgl_count %u\n", __func__, |
| 727 | cmd->tvc_sgl, cmd->tvc_sgl_count); |
| 728 | |
| 729 | ret = vhost_scsi_iov_to_sgl(cmd, write, data_iter, |
| 730 | cmd->tvc_sgl, cmd->tvc_sgl_count); |
| 731 | if (ret < 0) { |
| 732 | cmd->tvc_sgl_count = 0; |
| 733 | return ret; |
| 734 | } |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static int vhost_scsi_to_tcm_attr(int attr) |
| 739 | { |
| 740 | switch (attr) { |
| 741 | case VIRTIO_SCSI_S_SIMPLE: |
| 742 | return TCM_SIMPLE_TAG; |
| 743 | case VIRTIO_SCSI_S_ORDERED: |
| 744 | return TCM_ORDERED_TAG; |
| 745 | case VIRTIO_SCSI_S_HEAD: |
| 746 | return TCM_HEAD_TAG; |
| 747 | case VIRTIO_SCSI_S_ACA: |
| 748 | return TCM_ACA_TAG; |
| 749 | default: |
| 750 | break; |
| 751 | } |
| 752 | return TCM_SIMPLE_TAG; |
| 753 | } |
| 754 | |
| 755 | static void vhost_scsi_submission_work(struct work_struct *work) |
| 756 | { |
| 757 | struct vhost_scsi_cmd *cmd = |
| 758 | container_of(work, struct vhost_scsi_cmd, work); |
| 759 | struct vhost_scsi_nexus *tv_nexus; |
| 760 | struct se_cmd *se_cmd = &cmd->tvc_se_cmd; |
| 761 | struct scatterlist *sg_ptr, *sg_prot_ptr = NULL; |
| 762 | int rc; |
| 763 | |
| 764 | /* FIXME: BIDI operation */ |
| 765 | if (cmd->tvc_sgl_count) { |
| 766 | sg_ptr = cmd->tvc_sgl; |
| 767 | |
| 768 | if (cmd->tvc_prot_sgl_count) |
| 769 | sg_prot_ptr = cmd->tvc_prot_sgl; |
| 770 | else |
| 771 | se_cmd->prot_pto = true; |
| 772 | } else { |
| 773 | sg_ptr = NULL; |
| 774 | } |
| 775 | tv_nexus = cmd->tvc_nexus; |
| 776 | |
| 777 | se_cmd->tag = 0; |
| 778 | rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess, |
| 779 | cmd->tvc_cdb, &cmd->tvc_sense_buf[0], |
| 780 | cmd->tvc_lun, cmd->tvc_exp_data_len, |
| 781 | vhost_scsi_to_tcm_attr(cmd->tvc_task_attr), |
| 782 | cmd->tvc_data_direction, TARGET_SCF_ACK_KREF, |
| 783 | sg_ptr, cmd->tvc_sgl_count, NULL, 0, sg_prot_ptr, |
| 784 | cmd->tvc_prot_sgl_count); |
| 785 | if (rc < 0) { |
| 786 | transport_send_check_condition_and_sense(se_cmd, |
| 787 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
| 788 | transport_generic_free_cmd(se_cmd, 0); |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | static void |
| 793 | vhost_scsi_send_bad_target(struct vhost_scsi *vs, |
| 794 | struct vhost_virtqueue *vq, |
| 795 | int head, unsigned out) |
| 796 | { |
| 797 | struct virtio_scsi_cmd_resp __user *resp; |
| 798 | struct virtio_scsi_cmd_resp rsp; |
| 799 | int ret; |
| 800 | |
| 801 | memset(&rsp, 0, sizeof(rsp)); |
| 802 | rsp.response = VIRTIO_SCSI_S_BAD_TARGET; |
| 803 | resp = vq->iov[out].iov_base; |
| 804 | ret = __copy_to_user(resp, &rsp, sizeof(rsp)); |
| 805 | if (!ret) |
| 806 | vhost_add_used_and_signal(&vs->dev, vq, head, 0); |
| 807 | else |
| 808 | pr_err("Faulted on virtio_scsi_cmd_resp\n"); |
| 809 | } |
| 810 | |
| 811 | static int |
| 812 | vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, |
| 813 | struct vhost_scsi_ctx *vc) |
| 814 | { |
| 815 | int ret = -ENXIO; |
| 816 | |
| 817 | vc->head = vhost_get_vq_desc(vq, vq->iov, |
| 818 | ARRAY_SIZE(vq->iov), &vc->out, &vc->in, |
| 819 | NULL, NULL); |
| 820 | |
| 821 | pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", |
| 822 | vc->head, vc->out, vc->in); |
| 823 | |
| 824 | /* On error, stop handling until the next kick. */ |
| 825 | if (unlikely(vc->head < 0)) |
| 826 | goto done; |
| 827 | |
| 828 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
| 829 | if (vc->head == vq->num) { |
| 830 | if (unlikely(vhost_enable_notify(&vs->dev, vq))) { |
| 831 | vhost_disable_notify(&vs->dev, vq); |
| 832 | ret = -EAGAIN; |
| 833 | } |
| 834 | goto done; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Get the size of request and response buffers. |
| 839 | * FIXME: Not correct for BIDI operation |
| 840 | */ |
| 841 | vc->out_size = iov_length(vq->iov, vc->out); |
| 842 | vc->in_size = iov_length(&vq->iov[vc->out], vc->in); |
| 843 | |
| 844 | /* |
| 845 | * Copy over the virtio-scsi request header, which for a |
| 846 | * ANY_LAYOUT enabled guest may span multiple iovecs, or a |
| 847 | * single iovec may contain both the header + outgoing |
| 848 | * WRITE payloads. |
| 849 | * |
| 850 | * copy_from_iter() will advance out_iter, so that it will |
| 851 | * point at the start of the outgoing WRITE payload, if |
| 852 | * DMA_TO_DEVICE is set. |
| 853 | */ |
| 854 | iov_iter_init(&vc->out_iter, WRITE, vq->iov, vc->out, vc->out_size); |
| 855 | ret = 0; |
| 856 | |
| 857 | done: |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | static int |
| 862 | vhost_scsi_chk_size(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) |
| 863 | { |
| 864 | if (unlikely(vc->in_size < vc->rsp_size)) { |
| 865 | vq_err(vq, |
| 866 | "Response buf too small, need min %zu bytes got %zu", |
| 867 | vc->rsp_size, vc->in_size); |
| 868 | return -EINVAL; |
| 869 | } else if (unlikely(vc->out_size < vc->req_size)) { |
| 870 | vq_err(vq, |
| 871 | "Request buf too small, need min %zu bytes got %zu", |
| 872 | vc->req_size, vc->out_size); |
| 873 | return -EIO; |
| 874 | } |
| 875 | |
| 876 | return 0; |
| 877 | } |
| 878 | |
| 879 | static int |
| 880 | vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc, |
| 881 | struct vhost_scsi_tpg **tpgp) |
| 882 | { |
| 883 | int ret = -EIO; |
| 884 | |
| 885 | if (unlikely(!copy_from_iter_full(vc->req, vc->req_size, |
| 886 | &vc->out_iter))) { |
| 887 | vq_err(vq, "Faulted on copy_from_iter_full\n"); |
| 888 | } else if (unlikely(*vc->lunp != 1)) { |
| 889 | /* virtio-scsi spec requires byte 0 of the lun to be 1 */ |
| 890 | vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp); |
| 891 | } else { |
| 892 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
| 893 | |
| 894 | vs_tpg = vq->private_data; /* validated at handler entry */ |
| 895 | |
| 896 | tpg = READ_ONCE(vs_tpg[*vc->target]); |
| 897 | if (unlikely(!tpg)) { |
| 898 | vq_err(vq, "Target 0x%x does not exist\n", *vc->target); |
| 899 | } else { |
| 900 | if (tpgp) |
| 901 | *tpgp = tpg; |
| 902 | ret = 0; |
| 903 | } |
| 904 | } |
| 905 | |
| 906 | return ret; |
| 907 | } |
| 908 | |
| 909 | static void |
| 910 | vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) |
| 911 | { |
| 912 | struct vhost_scsi_tpg **vs_tpg, *tpg; |
| 913 | struct virtio_scsi_cmd_req v_req; |
| 914 | struct virtio_scsi_cmd_req_pi v_req_pi; |
| 915 | struct vhost_scsi_ctx vc; |
| 916 | struct vhost_scsi_cmd *cmd; |
| 917 | struct iov_iter in_iter, prot_iter, data_iter; |
| 918 | u64 tag; |
| 919 | u32 exp_data_len, data_direction; |
| 920 | int ret, prot_bytes; |
| 921 | u16 lun; |
| 922 | u8 task_attr; |
| 923 | bool t10_pi = vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI); |
| 924 | void *cdb; |
| 925 | |
| 926 | mutex_lock(&vq->mutex); |
| 927 | /* |
| 928 | * We can handle the vq only after the endpoint is setup by calling the |
| 929 | * VHOST_SCSI_SET_ENDPOINT ioctl. |
| 930 | */ |
| 931 | vs_tpg = vq->private_data; |
| 932 | if (!vs_tpg) |
| 933 | goto out; |
| 934 | |
| 935 | memset(&vc, 0, sizeof(vc)); |
| 936 | vc.rsp_size = sizeof(struct virtio_scsi_cmd_resp); |
| 937 | |
| 938 | vhost_disable_notify(&vs->dev, vq); |
| 939 | |
| 940 | for (;;) { |
| 941 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
| 942 | if (ret) |
| 943 | goto err; |
| 944 | |
| 945 | /* |
| 946 | * Setup pointers and values based upon different virtio-scsi |
| 947 | * request header if T10_PI is enabled in KVM guest. |
| 948 | */ |
| 949 | if (t10_pi) { |
| 950 | vc.req = &v_req_pi; |
| 951 | vc.req_size = sizeof(v_req_pi); |
| 952 | vc.lunp = &v_req_pi.lun[0]; |
| 953 | vc.target = &v_req_pi.lun[1]; |
| 954 | } else { |
| 955 | vc.req = &v_req; |
| 956 | vc.req_size = sizeof(v_req); |
| 957 | vc.lunp = &v_req.lun[0]; |
| 958 | vc.target = &v_req.lun[1]; |
| 959 | } |
| 960 | |
| 961 | /* |
| 962 | * Validate the size of request and response buffers. |
| 963 | * Check for a sane response buffer so we can report |
| 964 | * early errors back to the guest. |
| 965 | */ |
| 966 | ret = vhost_scsi_chk_size(vq, &vc); |
| 967 | if (ret) |
| 968 | goto err; |
| 969 | |
| 970 | ret = vhost_scsi_get_req(vq, &vc, &tpg); |
| 971 | if (ret) |
| 972 | goto err; |
| 973 | |
| 974 | ret = -EIO; /* bad target on any error from here on */ |
| 975 | |
| 976 | /* |
| 977 | * Determine data_direction by calculating the total outgoing |
| 978 | * iovec sizes + incoming iovec sizes vs. virtio-scsi request + |
| 979 | * response headers respectively. |
| 980 | * |
| 981 | * For DMA_TO_DEVICE this is out_iter, which is already pointing |
| 982 | * to the right place. |
| 983 | * |
| 984 | * For DMA_FROM_DEVICE, the iovec will be just past the end |
| 985 | * of the virtio-scsi response header in either the same |
| 986 | * or immediately following iovec. |
| 987 | * |
| 988 | * Any associated T10_PI bytes for the outgoing / incoming |
| 989 | * payloads are included in calculation of exp_data_len here. |
| 990 | */ |
| 991 | prot_bytes = 0; |
| 992 | |
| 993 | if (vc.out_size > vc.req_size) { |
| 994 | data_direction = DMA_TO_DEVICE; |
| 995 | exp_data_len = vc.out_size - vc.req_size; |
| 996 | data_iter = vc.out_iter; |
| 997 | } else if (vc.in_size > vc.rsp_size) { |
| 998 | data_direction = DMA_FROM_DEVICE; |
| 999 | exp_data_len = vc.in_size - vc.rsp_size; |
| 1000 | |
| 1001 | iov_iter_init(&in_iter, READ, &vq->iov[vc.out], vc.in, |
| 1002 | vc.rsp_size + exp_data_len); |
| 1003 | iov_iter_advance(&in_iter, vc.rsp_size); |
| 1004 | data_iter = in_iter; |
| 1005 | } else { |
| 1006 | data_direction = DMA_NONE; |
| 1007 | exp_data_len = 0; |
| 1008 | } |
| 1009 | /* |
| 1010 | * If T10_PI header + payload is present, setup prot_iter values |
| 1011 | * and recalculate data_iter for vhost_scsi_mapal() mapping to |
| 1012 | * host scatterlists via get_user_pages_fast(). |
| 1013 | */ |
| 1014 | if (t10_pi) { |
| 1015 | if (v_req_pi.pi_bytesout) { |
| 1016 | if (data_direction != DMA_TO_DEVICE) { |
| 1017 | vq_err(vq, "Received non zero pi_bytesout," |
| 1018 | " but wrong data_direction\n"); |
| 1019 | goto err; |
| 1020 | } |
| 1021 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesout); |
| 1022 | } else if (v_req_pi.pi_bytesin) { |
| 1023 | if (data_direction != DMA_FROM_DEVICE) { |
| 1024 | vq_err(vq, "Received non zero pi_bytesin," |
| 1025 | " but wrong data_direction\n"); |
| 1026 | goto err; |
| 1027 | } |
| 1028 | prot_bytes = vhost32_to_cpu(vq, v_req_pi.pi_bytesin); |
| 1029 | } |
| 1030 | /* |
| 1031 | * Set prot_iter to data_iter and truncate it to |
| 1032 | * prot_bytes, and advance data_iter past any |
| 1033 | * preceeding prot_bytes that may be present. |
| 1034 | * |
| 1035 | * Also fix up the exp_data_len to reflect only the |
| 1036 | * actual data payload length. |
| 1037 | */ |
| 1038 | if (prot_bytes) { |
| 1039 | exp_data_len -= prot_bytes; |
| 1040 | prot_iter = data_iter; |
| 1041 | iov_iter_truncate(&prot_iter, prot_bytes); |
| 1042 | iov_iter_advance(&data_iter, prot_bytes); |
| 1043 | } |
| 1044 | tag = vhost64_to_cpu(vq, v_req_pi.tag); |
| 1045 | task_attr = v_req_pi.task_attr; |
| 1046 | cdb = &v_req_pi.cdb[0]; |
| 1047 | lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) & 0x3FFF; |
| 1048 | } else { |
| 1049 | tag = vhost64_to_cpu(vq, v_req.tag); |
| 1050 | task_attr = v_req.task_attr; |
| 1051 | cdb = &v_req.cdb[0]; |
| 1052 | lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF; |
| 1053 | } |
| 1054 | /* |
| 1055 | * Check that the received CDB size does not exceeded our |
| 1056 | * hardcoded max for vhost-scsi, then get a pre-allocated |
| 1057 | * cmd descriptor for the new virtio-scsi tag. |
| 1058 | * |
| 1059 | * TODO what if cdb was too small for varlen cdb header? |
| 1060 | */ |
| 1061 | if (unlikely(scsi_command_size(cdb) > VHOST_SCSI_MAX_CDB_SIZE)) { |
| 1062 | vq_err(vq, "Received SCSI CDB with command_size: %d that" |
| 1063 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
| 1064 | scsi_command_size(cdb), VHOST_SCSI_MAX_CDB_SIZE); |
| 1065 | goto err; |
| 1066 | } |
| 1067 | cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr, |
| 1068 | exp_data_len + prot_bytes, |
| 1069 | data_direction); |
| 1070 | if (IS_ERR(cmd)) { |
| 1071 | vq_err(vq, "vhost_scsi_get_tag failed %ld\n", |
| 1072 | PTR_ERR(cmd)); |
| 1073 | goto err; |
| 1074 | } |
| 1075 | cmd->tvc_vhost = vs; |
| 1076 | cmd->tvc_vq = vq; |
| 1077 | cmd->tvc_resp_iov = vq->iov[vc.out]; |
| 1078 | cmd->tvc_in_iovs = vc.in; |
| 1079 | |
| 1080 | pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n", |
| 1081 | cmd->tvc_cdb[0], cmd->tvc_lun); |
| 1082 | pr_debug("cmd: %p exp_data_len: %d, prot_bytes: %d data_direction:" |
| 1083 | " %d\n", cmd, exp_data_len, prot_bytes, data_direction); |
| 1084 | |
| 1085 | if (data_direction != DMA_NONE) { |
| 1086 | if (unlikely(vhost_scsi_mapal(cmd, prot_bytes, |
| 1087 | &prot_iter, exp_data_len, |
| 1088 | &data_iter))) { |
| 1089 | vq_err(vq, "Failed to map iov to sgl\n"); |
| 1090 | vhost_scsi_release_cmd(&cmd->tvc_se_cmd); |
| 1091 | goto err; |
| 1092 | } |
| 1093 | } |
| 1094 | /* |
| 1095 | * Save the descriptor from vhost_get_vq_desc() to be used to |
| 1096 | * complete the virtio-scsi request in TCM callback context via |
| 1097 | * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() |
| 1098 | */ |
| 1099 | cmd->tvc_vq_desc = vc.head; |
| 1100 | /* |
| 1101 | * Dispatch cmd descriptor for cmwq execution in process |
| 1102 | * context provided by vhost_scsi_workqueue. This also ensures |
| 1103 | * cmd is executed on the same kworker CPU as this vhost |
| 1104 | * thread to gain positive L2 cache locality effects. |
| 1105 | */ |
| 1106 | INIT_WORK(&cmd->work, vhost_scsi_submission_work); |
| 1107 | queue_work(vhost_scsi_workqueue, &cmd->work); |
| 1108 | ret = 0; |
| 1109 | err: |
| 1110 | /* |
| 1111 | * ENXIO: No more requests, or read error, wait for next kick |
| 1112 | * EINVAL: Invalid response buffer, drop the request |
| 1113 | * EIO: Respond with bad target |
| 1114 | * EAGAIN: Pending request |
| 1115 | */ |
| 1116 | if (ret == -ENXIO) |
| 1117 | break; |
| 1118 | else if (ret == -EIO) |
| 1119 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); |
| 1120 | } |
| 1121 | out: |
| 1122 | mutex_unlock(&vq->mutex); |
| 1123 | } |
| 1124 | |
| 1125 | static void |
| 1126 | vhost_scsi_send_tmf_reject(struct vhost_scsi *vs, |
| 1127 | struct vhost_virtqueue *vq, |
| 1128 | struct vhost_scsi_ctx *vc) |
| 1129 | { |
| 1130 | struct virtio_scsi_ctrl_tmf_resp rsp; |
| 1131 | struct iov_iter iov_iter; |
| 1132 | int ret; |
| 1133 | |
| 1134 | pr_debug("%s\n", __func__); |
| 1135 | memset(&rsp, 0, sizeof(rsp)); |
| 1136 | rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; |
| 1137 | |
| 1138 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); |
| 1139 | |
| 1140 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); |
| 1141 | if (likely(ret == sizeof(rsp))) |
| 1142 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
| 1143 | else |
| 1144 | pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); |
| 1145 | } |
| 1146 | |
| 1147 | static void |
| 1148 | vhost_scsi_send_an_resp(struct vhost_scsi *vs, |
| 1149 | struct vhost_virtqueue *vq, |
| 1150 | struct vhost_scsi_ctx *vc) |
| 1151 | { |
| 1152 | struct virtio_scsi_ctrl_an_resp rsp; |
| 1153 | struct iov_iter iov_iter; |
| 1154 | int ret; |
| 1155 | |
| 1156 | pr_debug("%s\n", __func__); |
| 1157 | memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ |
| 1158 | rsp.response = VIRTIO_SCSI_S_OK; |
| 1159 | |
| 1160 | iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); |
| 1161 | |
| 1162 | ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); |
| 1163 | if (likely(ret == sizeof(rsp))) |
| 1164 | vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); |
| 1165 | else |
| 1166 | pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); |
| 1167 | } |
| 1168 | |
| 1169 | static void |
| 1170 | vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) |
| 1171 | { |
| 1172 | union { |
| 1173 | __virtio32 type; |
| 1174 | struct virtio_scsi_ctrl_an_req an; |
| 1175 | struct virtio_scsi_ctrl_tmf_req tmf; |
| 1176 | } v_req; |
| 1177 | struct vhost_scsi_ctx vc; |
| 1178 | size_t typ_size; |
| 1179 | int ret; |
| 1180 | |
| 1181 | mutex_lock(&vq->mutex); |
| 1182 | /* |
| 1183 | * We can handle the vq only after the endpoint is setup by calling the |
| 1184 | * VHOST_SCSI_SET_ENDPOINT ioctl. |
| 1185 | */ |
| 1186 | if (!vq->private_data) |
| 1187 | goto out; |
| 1188 | |
| 1189 | memset(&vc, 0, sizeof(vc)); |
| 1190 | |
| 1191 | vhost_disable_notify(&vs->dev, vq); |
| 1192 | |
| 1193 | for (;;) { |
| 1194 | ret = vhost_scsi_get_desc(vs, vq, &vc); |
| 1195 | if (ret) |
| 1196 | goto err; |
| 1197 | |
| 1198 | /* |
| 1199 | * Get the request type first in order to setup |
| 1200 | * other parameters dependent on the type. |
| 1201 | */ |
| 1202 | vc.req = &v_req.type; |
| 1203 | typ_size = sizeof(v_req.type); |
| 1204 | |
| 1205 | if (unlikely(!copy_from_iter_full(vc.req, typ_size, |
| 1206 | &vc.out_iter))) { |
| 1207 | vq_err(vq, "Faulted on copy_from_iter tmf type\n"); |
| 1208 | /* |
| 1209 | * The size of the response buffer depends on the |
| 1210 | * request type and must be validated against it. |
| 1211 | * Since the request type is not known, don't send |
| 1212 | * a response. |
| 1213 | */ |
| 1214 | continue; |
| 1215 | } |
| 1216 | |
| 1217 | switch (v_req.type) { |
| 1218 | case VIRTIO_SCSI_T_TMF: |
| 1219 | vc.req = &v_req.tmf; |
| 1220 | vc.req_size = sizeof(struct virtio_scsi_ctrl_tmf_req); |
| 1221 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_tmf_resp); |
| 1222 | vc.lunp = &v_req.tmf.lun[0]; |
| 1223 | vc.target = &v_req.tmf.lun[1]; |
| 1224 | break; |
| 1225 | case VIRTIO_SCSI_T_AN_QUERY: |
| 1226 | case VIRTIO_SCSI_T_AN_SUBSCRIBE: |
| 1227 | vc.req = &v_req.an; |
| 1228 | vc.req_size = sizeof(struct virtio_scsi_ctrl_an_req); |
| 1229 | vc.rsp_size = sizeof(struct virtio_scsi_ctrl_an_resp); |
| 1230 | vc.lunp = &v_req.an.lun[0]; |
| 1231 | vc.target = NULL; |
| 1232 | break; |
| 1233 | default: |
| 1234 | vq_err(vq, "Unknown control request %d", v_req.type); |
| 1235 | continue; |
| 1236 | } |
| 1237 | |
| 1238 | /* |
| 1239 | * Validate the size of request and response buffers. |
| 1240 | * Check for a sane response buffer so we can report |
| 1241 | * early errors back to the guest. |
| 1242 | */ |
| 1243 | ret = vhost_scsi_chk_size(vq, &vc); |
| 1244 | if (ret) |
| 1245 | goto err; |
| 1246 | |
| 1247 | /* |
| 1248 | * Get the rest of the request now that its size is known. |
| 1249 | */ |
| 1250 | vc.req += typ_size; |
| 1251 | vc.req_size -= typ_size; |
| 1252 | |
| 1253 | ret = vhost_scsi_get_req(vq, &vc, NULL); |
| 1254 | if (ret) |
| 1255 | goto err; |
| 1256 | |
| 1257 | if (v_req.type == VIRTIO_SCSI_T_TMF) |
| 1258 | vhost_scsi_send_tmf_reject(vs, vq, &vc); |
| 1259 | else |
| 1260 | vhost_scsi_send_an_resp(vs, vq, &vc); |
| 1261 | err: |
| 1262 | /* |
| 1263 | * ENXIO: No more requests, or read error, wait for next kick |
| 1264 | * EINVAL: Invalid response buffer, drop the request |
| 1265 | * EIO: Respond with bad target |
| 1266 | * EAGAIN: Pending request |
| 1267 | */ |
| 1268 | if (ret == -ENXIO) |
| 1269 | break; |
| 1270 | else if (ret == -EIO) |
| 1271 | vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); |
| 1272 | } |
| 1273 | out: |
| 1274 | mutex_unlock(&vq->mutex); |
| 1275 | } |
| 1276 | |
| 1277 | static void vhost_scsi_ctl_handle_kick(struct vhost_work *work) |
| 1278 | { |
| 1279 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 1280 | poll.work); |
| 1281 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); |
| 1282 | |
| 1283 | pr_debug("%s: The handling func for control queue.\n", __func__); |
| 1284 | vhost_scsi_ctl_handle_vq(vs, vq); |
| 1285 | } |
| 1286 | |
| 1287 | static void |
| 1288 | vhost_scsi_send_evt(struct vhost_scsi *vs, |
| 1289 | struct vhost_scsi_tpg *tpg, |
| 1290 | struct se_lun *lun, |
| 1291 | u32 event, |
| 1292 | u32 reason) |
| 1293 | { |
| 1294 | struct vhost_scsi_evt *evt; |
| 1295 | |
| 1296 | evt = vhost_scsi_allocate_evt(vs, event, reason); |
| 1297 | if (!evt) |
| 1298 | return; |
| 1299 | |
| 1300 | if (tpg && lun) { |
| 1301 | /* TODO: share lun setup code with virtio-scsi.ko */ |
| 1302 | /* |
| 1303 | * Note: evt->event is zeroed when we allocate it and |
| 1304 | * lun[4-7] need to be zero according to virtio-scsi spec. |
| 1305 | */ |
| 1306 | evt->event.lun[0] = 0x01; |
| 1307 | evt->event.lun[1] = tpg->tport_tpgt; |
| 1308 | if (lun->unpacked_lun >= 256) |
| 1309 | evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ; |
| 1310 | evt->event.lun[3] = lun->unpacked_lun & 0xFF; |
| 1311 | } |
| 1312 | |
| 1313 | llist_add(&evt->list, &vs->vs_event_list); |
| 1314 | vhost_work_queue(&vs->dev, &vs->vs_event_work); |
| 1315 | } |
| 1316 | |
| 1317 | static void vhost_scsi_evt_handle_kick(struct vhost_work *work) |
| 1318 | { |
| 1319 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 1320 | poll.work); |
| 1321 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); |
| 1322 | |
| 1323 | mutex_lock(&vq->mutex); |
| 1324 | if (!vq->private_data) |
| 1325 | goto out; |
| 1326 | |
| 1327 | if (vs->vs_events_missed) |
| 1328 | vhost_scsi_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
| 1329 | out: |
| 1330 | mutex_unlock(&vq->mutex); |
| 1331 | } |
| 1332 | |
| 1333 | static void vhost_scsi_handle_kick(struct vhost_work *work) |
| 1334 | { |
| 1335 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
| 1336 | poll.work); |
| 1337 | struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev); |
| 1338 | |
| 1339 | vhost_scsi_handle_vq(vs, vq); |
| 1340 | } |
| 1341 | |
| 1342 | static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index) |
| 1343 | { |
| 1344 | vhost_poll_flush(&vs->vqs[index].vq.poll); |
| 1345 | } |
| 1346 | |
| 1347 | /* Callers must hold dev mutex */ |
| 1348 | static void vhost_scsi_flush(struct vhost_scsi *vs) |
| 1349 | { |
| 1350 | struct vhost_scsi_inflight *old_inflight[VHOST_SCSI_MAX_VQ]; |
| 1351 | int i; |
| 1352 | |
| 1353 | /* Init new inflight and remember the old inflight */ |
| 1354 | vhost_scsi_init_inflight(vs, old_inflight); |
| 1355 | |
| 1356 | /* |
| 1357 | * The inflight->kref was initialized to 1. We decrement it here to |
| 1358 | * indicate the start of the flush operation so that it will reach 0 |
| 1359 | * when all the reqs are finished. |
| 1360 | */ |
| 1361 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
| 1362 | kref_put(&old_inflight[i]->kref, vhost_scsi_done_inflight); |
| 1363 | |
| 1364 | /* Flush both the vhost poll and vhost work */ |
| 1365 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
| 1366 | vhost_scsi_flush_vq(vs, i); |
| 1367 | vhost_work_flush(&vs->dev, &vs->vs_completion_work); |
| 1368 | vhost_work_flush(&vs->dev, &vs->vs_event_work); |
| 1369 | |
| 1370 | /* Wait for all reqs issued before the flush to be finished */ |
| 1371 | for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) |
| 1372 | wait_for_completion(&old_inflight[i]->comp); |
| 1373 | } |
| 1374 | |
| 1375 | /* |
| 1376 | * Called from vhost_scsi_ioctl() context to walk the list of available |
| 1377 | * vhost_scsi_tpg with an active struct vhost_scsi_nexus |
| 1378 | * |
| 1379 | * The lock nesting rule is: |
| 1380 | * vhost_scsi_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex |
| 1381 | */ |
| 1382 | static int |
| 1383 | vhost_scsi_set_endpoint(struct vhost_scsi *vs, |
| 1384 | struct vhost_scsi_target *t) |
| 1385 | { |
| 1386 | struct se_portal_group *se_tpg; |
| 1387 | struct vhost_scsi_tport *tv_tport; |
| 1388 | struct vhost_scsi_tpg *tpg; |
| 1389 | struct vhost_scsi_tpg **vs_tpg; |
| 1390 | struct vhost_virtqueue *vq; |
| 1391 | int index, ret, i, len; |
| 1392 | bool match = false; |
| 1393 | |
| 1394 | mutex_lock(&vhost_scsi_mutex); |
| 1395 | mutex_lock(&vs->dev.mutex); |
| 1396 | |
| 1397 | /* Verify that ring has been setup correctly. */ |
| 1398 | for (index = 0; index < vs->dev.nvqs; ++index) { |
| 1399 | /* Verify that ring has been setup correctly. */ |
| 1400 | if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { |
| 1401 | ret = -EFAULT; |
| 1402 | goto out; |
| 1403 | } |
| 1404 | } |
| 1405 | |
| 1406 | len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET; |
| 1407 | vs_tpg = kzalloc(len, GFP_KERNEL); |
| 1408 | if (!vs_tpg) { |
| 1409 | ret = -ENOMEM; |
| 1410 | goto out; |
| 1411 | } |
| 1412 | if (vs->vs_tpg) |
| 1413 | memcpy(vs_tpg, vs->vs_tpg, len); |
| 1414 | |
| 1415 | list_for_each_entry(tpg, &vhost_scsi_list, tv_tpg_list) { |
| 1416 | mutex_lock(&tpg->tv_tpg_mutex); |
| 1417 | if (!tpg->tpg_nexus) { |
| 1418 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1419 | continue; |
| 1420 | } |
| 1421 | if (tpg->tv_tpg_vhost_count != 0) { |
| 1422 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1423 | continue; |
| 1424 | } |
| 1425 | tv_tport = tpg->tport; |
| 1426 | |
| 1427 | if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) { |
| 1428 | if (vs->vs_tpg && vs->vs_tpg[tpg->tport_tpgt]) { |
| 1429 | kfree(vs_tpg); |
| 1430 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1431 | ret = -EEXIST; |
| 1432 | goto out; |
| 1433 | } |
| 1434 | /* |
| 1435 | * In order to ensure individual vhost-scsi configfs |
| 1436 | * groups cannot be removed while in use by vhost ioctl, |
| 1437 | * go ahead and take an explicit se_tpg->tpg_group.cg_item |
| 1438 | * dependency now. |
| 1439 | */ |
| 1440 | se_tpg = &tpg->se_tpg; |
| 1441 | ret = target_depend_item(&se_tpg->tpg_group.cg_item); |
| 1442 | if (ret) { |
| 1443 | pr_warn("target_depend_item() failed: %d\n", ret); |
| 1444 | kfree(vs_tpg); |
| 1445 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1446 | goto out; |
| 1447 | } |
| 1448 | tpg->tv_tpg_vhost_count++; |
| 1449 | tpg->vhost_scsi = vs; |
| 1450 | vs_tpg[tpg->tport_tpgt] = tpg; |
| 1451 | smp_mb__after_atomic(); |
| 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 | |
| 1480 | out: |
| 1481 | mutex_unlock(&vs->dev.mutex); |
| 1482 | mutex_unlock(&vhost_scsi_mutex); |
| 1483 | return ret; |
| 1484 | } |
| 1485 | |
| 1486 | static int |
| 1487 | vhost_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 | |
| 1566 | err_tpg: |
| 1567 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1568 | err_dev: |
| 1569 | mutex_unlock(&vs->dev.mutex); |
| 1570 | mutex_unlock(&vhost_scsi_mutex); |
| 1571 | return ret; |
| 1572 | } |
| 1573 | |
| 1574 | static 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 | |
| 1599 | static 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 | |
| 1632 | vhost_scsi_init_inflight(vs, NULL); |
| 1633 | |
| 1634 | f->private_data = vs; |
| 1635 | return 0; |
| 1636 | |
| 1637 | err_vqs: |
| 1638 | kvfree(vs); |
| 1639 | err_vs: |
| 1640 | return r; |
| 1641 | } |
| 1642 | |
| 1643 | static int vhost_scsi_release(struct inode *inode, struct file *f) |
| 1644 | { |
| 1645 | struct vhost_scsi *vs = f->private_data; |
| 1646 | struct vhost_scsi_target t; |
| 1647 | |
| 1648 | mutex_lock(&vs->dev.mutex); |
| 1649 | memcpy(t.vhost_wwpn, vs->vs_vhost_wwpn, sizeof(t.vhost_wwpn)); |
| 1650 | mutex_unlock(&vs->dev.mutex); |
| 1651 | vhost_scsi_clear_endpoint(vs, &t); |
| 1652 | vhost_dev_stop(&vs->dev); |
| 1653 | vhost_dev_cleanup(&vs->dev); |
| 1654 | /* Jobs can re-queue themselves in evt kick handler. Do extra flush. */ |
| 1655 | vhost_scsi_flush(vs); |
| 1656 | kfree(vs->dev.vqs); |
| 1657 | kvfree(vs); |
| 1658 | return 0; |
| 1659 | } |
| 1660 | |
| 1661 | static long |
| 1662 | vhost_scsi_ioctl(struct file *f, |
| 1663 | unsigned int ioctl, |
| 1664 | unsigned long arg) |
| 1665 | { |
| 1666 | struct vhost_scsi *vs = f->private_data; |
| 1667 | struct vhost_scsi_target backend; |
| 1668 | void __user *argp = (void __user *)arg; |
| 1669 | u64 __user *featurep = argp; |
| 1670 | u32 __user *eventsp = argp; |
| 1671 | u32 events_missed; |
| 1672 | u64 features; |
| 1673 | int r, abi_version = VHOST_SCSI_ABI_VERSION; |
| 1674 | struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
| 1675 | |
| 1676 | switch (ioctl) { |
| 1677 | case VHOST_SCSI_SET_ENDPOINT: |
| 1678 | if (copy_from_user(&backend, argp, sizeof backend)) |
| 1679 | return -EFAULT; |
| 1680 | if (backend.reserved != 0) |
| 1681 | return -EOPNOTSUPP; |
| 1682 | |
| 1683 | return vhost_scsi_set_endpoint(vs, &backend); |
| 1684 | case VHOST_SCSI_CLEAR_ENDPOINT: |
| 1685 | if (copy_from_user(&backend, argp, sizeof backend)) |
| 1686 | return -EFAULT; |
| 1687 | if (backend.reserved != 0) |
| 1688 | return -EOPNOTSUPP; |
| 1689 | |
| 1690 | return vhost_scsi_clear_endpoint(vs, &backend); |
| 1691 | case VHOST_SCSI_GET_ABI_VERSION: |
| 1692 | if (copy_to_user(argp, &abi_version, sizeof abi_version)) |
| 1693 | return -EFAULT; |
| 1694 | return 0; |
| 1695 | case VHOST_SCSI_SET_EVENTS_MISSED: |
| 1696 | if (get_user(events_missed, eventsp)) |
| 1697 | return -EFAULT; |
| 1698 | mutex_lock(&vq->mutex); |
| 1699 | vs->vs_events_missed = events_missed; |
| 1700 | mutex_unlock(&vq->mutex); |
| 1701 | return 0; |
| 1702 | case VHOST_SCSI_GET_EVENTS_MISSED: |
| 1703 | mutex_lock(&vq->mutex); |
| 1704 | events_missed = vs->vs_events_missed; |
| 1705 | mutex_unlock(&vq->mutex); |
| 1706 | if (put_user(events_missed, eventsp)) |
| 1707 | return -EFAULT; |
| 1708 | return 0; |
| 1709 | case VHOST_GET_FEATURES: |
| 1710 | features = VHOST_SCSI_FEATURES; |
| 1711 | if (copy_to_user(featurep, &features, sizeof features)) |
| 1712 | return -EFAULT; |
| 1713 | return 0; |
| 1714 | case VHOST_SET_FEATURES: |
| 1715 | if (copy_from_user(&features, featurep, sizeof features)) |
| 1716 | return -EFAULT; |
| 1717 | return vhost_scsi_set_features(vs, features); |
| 1718 | default: |
| 1719 | mutex_lock(&vs->dev.mutex); |
| 1720 | r = vhost_dev_ioctl(&vs->dev, ioctl, argp); |
| 1721 | /* TODO: flush backend after dev ioctl. */ |
| 1722 | if (r == -ENOIOCTLCMD) |
| 1723 | r = vhost_vring_ioctl(&vs->dev, ioctl, argp); |
| 1724 | mutex_unlock(&vs->dev.mutex); |
| 1725 | return r; |
| 1726 | } |
| 1727 | } |
| 1728 | |
| 1729 | #ifdef CONFIG_COMPAT |
| 1730 | static long vhost_scsi_compat_ioctl(struct file *f, unsigned int ioctl, |
| 1731 | unsigned long arg) |
| 1732 | { |
| 1733 | return vhost_scsi_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); |
| 1734 | } |
| 1735 | #endif |
| 1736 | |
| 1737 | static const struct file_operations vhost_scsi_fops = { |
| 1738 | .owner = THIS_MODULE, |
| 1739 | .release = vhost_scsi_release, |
| 1740 | .unlocked_ioctl = vhost_scsi_ioctl, |
| 1741 | #ifdef CONFIG_COMPAT |
| 1742 | .compat_ioctl = vhost_scsi_compat_ioctl, |
| 1743 | #endif |
| 1744 | .open = vhost_scsi_open, |
| 1745 | .llseek = noop_llseek, |
| 1746 | }; |
| 1747 | |
| 1748 | static struct miscdevice vhost_scsi_misc = { |
| 1749 | MISC_DYNAMIC_MINOR, |
| 1750 | "vhost-scsi", |
| 1751 | &vhost_scsi_fops, |
| 1752 | }; |
| 1753 | |
| 1754 | static int __init vhost_scsi_register(void) |
| 1755 | { |
| 1756 | return misc_register(&vhost_scsi_misc); |
| 1757 | } |
| 1758 | |
| 1759 | static void vhost_scsi_deregister(void) |
| 1760 | { |
| 1761 | misc_deregister(&vhost_scsi_misc); |
| 1762 | } |
| 1763 | |
| 1764 | static char *vhost_scsi_dump_proto_id(struct vhost_scsi_tport *tport) |
| 1765 | { |
| 1766 | switch (tport->tport_proto_id) { |
| 1767 | case SCSI_PROTOCOL_SAS: |
| 1768 | return "SAS"; |
| 1769 | case SCSI_PROTOCOL_FCP: |
| 1770 | return "FCP"; |
| 1771 | case SCSI_PROTOCOL_ISCSI: |
| 1772 | return "iSCSI"; |
| 1773 | default: |
| 1774 | break; |
| 1775 | } |
| 1776 | |
| 1777 | return "Unknown"; |
| 1778 | } |
| 1779 | |
| 1780 | static void |
| 1781 | vhost_scsi_do_plug(struct vhost_scsi_tpg *tpg, |
| 1782 | struct se_lun *lun, bool plug) |
| 1783 | { |
| 1784 | |
| 1785 | struct vhost_scsi *vs = tpg->vhost_scsi; |
| 1786 | struct vhost_virtqueue *vq; |
| 1787 | u32 reason; |
| 1788 | |
| 1789 | if (!vs) |
| 1790 | return; |
| 1791 | |
| 1792 | mutex_lock(&vs->dev.mutex); |
| 1793 | |
| 1794 | if (plug) |
| 1795 | reason = VIRTIO_SCSI_EVT_RESET_RESCAN; |
| 1796 | else |
| 1797 | reason = VIRTIO_SCSI_EVT_RESET_REMOVED; |
| 1798 | |
| 1799 | vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq; |
| 1800 | mutex_lock(&vq->mutex); |
| 1801 | if (vhost_has_feature(vq, VIRTIO_SCSI_F_HOTPLUG)) |
| 1802 | vhost_scsi_send_evt(vs, tpg, lun, |
| 1803 | VIRTIO_SCSI_T_TRANSPORT_RESET, reason); |
| 1804 | mutex_unlock(&vq->mutex); |
| 1805 | mutex_unlock(&vs->dev.mutex); |
| 1806 | } |
| 1807 | |
| 1808 | static void vhost_scsi_hotplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
| 1809 | { |
| 1810 | vhost_scsi_do_plug(tpg, lun, true); |
| 1811 | } |
| 1812 | |
| 1813 | static void vhost_scsi_hotunplug(struct vhost_scsi_tpg *tpg, struct se_lun *lun) |
| 1814 | { |
| 1815 | vhost_scsi_do_plug(tpg, lun, false); |
| 1816 | } |
| 1817 | |
| 1818 | static int vhost_scsi_port_link(struct se_portal_group *se_tpg, |
| 1819 | struct se_lun *lun) |
| 1820 | { |
| 1821 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 1822 | struct vhost_scsi_tpg, se_tpg); |
| 1823 | |
| 1824 | mutex_lock(&vhost_scsi_mutex); |
| 1825 | |
| 1826 | mutex_lock(&tpg->tv_tpg_mutex); |
| 1827 | tpg->tv_tpg_port_count++; |
| 1828 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1829 | |
| 1830 | vhost_scsi_hotplug(tpg, lun); |
| 1831 | |
| 1832 | mutex_unlock(&vhost_scsi_mutex); |
| 1833 | |
| 1834 | return 0; |
| 1835 | } |
| 1836 | |
| 1837 | static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg, |
| 1838 | struct se_lun *lun) |
| 1839 | { |
| 1840 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 1841 | struct vhost_scsi_tpg, se_tpg); |
| 1842 | |
| 1843 | mutex_lock(&vhost_scsi_mutex); |
| 1844 | |
| 1845 | mutex_lock(&tpg->tv_tpg_mutex); |
| 1846 | tpg->tv_tpg_port_count--; |
| 1847 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1848 | |
| 1849 | vhost_scsi_hotunplug(tpg, lun); |
| 1850 | |
| 1851 | mutex_unlock(&vhost_scsi_mutex); |
| 1852 | } |
| 1853 | |
| 1854 | static void vhost_scsi_free_cmd_map_res(struct se_session *se_sess) |
| 1855 | { |
| 1856 | struct vhost_scsi_cmd *tv_cmd; |
| 1857 | unsigned int i; |
| 1858 | |
| 1859 | if (!se_sess->sess_cmd_map) |
| 1860 | return; |
| 1861 | |
| 1862 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
| 1863 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; |
| 1864 | |
| 1865 | kfree(tv_cmd->tvc_sgl); |
| 1866 | kfree(tv_cmd->tvc_prot_sgl); |
| 1867 | kfree(tv_cmd->tvc_upages); |
| 1868 | } |
| 1869 | } |
| 1870 | |
| 1871 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store( |
| 1872 | struct config_item *item, const char *page, size_t count) |
| 1873 | { |
| 1874 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
| 1875 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 1876 | struct vhost_scsi_tpg, se_tpg); |
| 1877 | unsigned long val; |
| 1878 | int ret = kstrtoul(page, 0, &val); |
| 1879 | |
| 1880 | if (ret) { |
| 1881 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); |
| 1882 | return ret; |
| 1883 | } |
| 1884 | if (val != 0 && val != 1 && val != 3) { |
| 1885 | pr_err("Invalid vhost_scsi fabric_prot_type: %lu\n", val); |
| 1886 | return -EINVAL; |
| 1887 | } |
| 1888 | tpg->tv_fabric_prot_type = val; |
| 1889 | |
| 1890 | return count; |
| 1891 | } |
| 1892 | |
| 1893 | static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_show( |
| 1894 | struct config_item *item, char *page) |
| 1895 | { |
| 1896 | struct se_portal_group *se_tpg = attrib_to_tpg(item); |
| 1897 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 1898 | struct vhost_scsi_tpg, se_tpg); |
| 1899 | |
| 1900 | return sprintf(page, "%d\n", tpg->tv_fabric_prot_type); |
| 1901 | } |
| 1902 | |
| 1903 | CONFIGFS_ATTR(vhost_scsi_tpg_attrib_, fabric_prot_type); |
| 1904 | |
| 1905 | static struct configfs_attribute *vhost_scsi_tpg_attrib_attrs[] = { |
| 1906 | &vhost_scsi_tpg_attrib_attr_fabric_prot_type, |
| 1907 | NULL, |
| 1908 | }; |
| 1909 | |
| 1910 | static int vhost_scsi_nexus_cb(struct se_portal_group *se_tpg, |
| 1911 | struct se_session *se_sess, void *p) |
| 1912 | { |
| 1913 | struct vhost_scsi_cmd *tv_cmd; |
| 1914 | unsigned int i; |
| 1915 | |
| 1916 | for (i = 0; i < VHOST_SCSI_DEFAULT_TAGS; i++) { |
| 1917 | tv_cmd = &((struct vhost_scsi_cmd *)se_sess->sess_cmd_map)[i]; |
| 1918 | |
| 1919 | tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS, |
| 1920 | sizeof(struct scatterlist), |
| 1921 | GFP_KERNEL); |
| 1922 | if (!tv_cmd->tvc_sgl) { |
| 1923 | pr_err("Unable to allocate tv_cmd->tvc_sgl\n"); |
| 1924 | goto out; |
| 1925 | } |
| 1926 | |
| 1927 | tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES, |
| 1928 | sizeof(struct page *), |
| 1929 | GFP_KERNEL); |
| 1930 | if (!tv_cmd->tvc_upages) { |
| 1931 | pr_err("Unable to allocate tv_cmd->tvc_upages\n"); |
| 1932 | goto out; |
| 1933 | } |
| 1934 | |
| 1935 | tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS, |
| 1936 | sizeof(struct scatterlist), |
| 1937 | GFP_KERNEL); |
| 1938 | if (!tv_cmd->tvc_prot_sgl) { |
| 1939 | pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n"); |
| 1940 | goto out; |
| 1941 | } |
| 1942 | } |
| 1943 | return 0; |
| 1944 | out: |
| 1945 | vhost_scsi_free_cmd_map_res(se_sess); |
| 1946 | return -ENOMEM; |
| 1947 | } |
| 1948 | |
| 1949 | static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg, |
| 1950 | const char *name) |
| 1951 | { |
| 1952 | struct vhost_scsi_nexus *tv_nexus; |
| 1953 | |
| 1954 | mutex_lock(&tpg->tv_tpg_mutex); |
| 1955 | if (tpg->tpg_nexus) { |
| 1956 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1957 | pr_debug("tpg->tpg_nexus already exists\n"); |
| 1958 | return -EEXIST; |
| 1959 | } |
| 1960 | |
| 1961 | tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL); |
| 1962 | if (!tv_nexus) { |
| 1963 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1964 | pr_err("Unable to allocate struct vhost_scsi_nexus\n"); |
| 1965 | return -ENOMEM; |
| 1966 | } |
| 1967 | /* |
| 1968 | * Since we are running in 'demo mode' this call with generate a |
| 1969 | * struct se_node_acl for the vhost_scsi struct se_portal_group with |
| 1970 | * the SCSI Initiator port name of the passed configfs group 'name'. |
| 1971 | */ |
| 1972 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, |
| 1973 | VHOST_SCSI_DEFAULT_TAGS, |
| 1974 | sizeof(struct vhost_scsi_cmd), |
| 1975 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, |
| 1976 | (unsigned char *)name, tv_nexus, |
| 1977 | vhost_scsi_nexus_cb); |
| 1978 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
| 1979 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1980 | kfree(tv_nexus); |
| 1981 | return -ENOMEM; |
| 1982 | } |
| 1983 | tpg->tpg_nexus = tv_nexus; |
| 1984 | |
| 1985 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1986 | return 0; |
| 1987 | } |
| 1988 | |
| 1989 | static int vhost_scsi_drop_nexus(struct vhost_scsi_tpg *tpg) |
| 1990 | { |
| 1991 | struct se_session *se_sess; |
| 1992 | struct vhost_scsi_nexus *tv_nexus; |
| 1993 | |
| 1994 | mutex_lock(&tpg->tv_tpg_mutex); |
| 1995 | tv_nexus = tpg->tpg_nexus; |
| 1996 | if (!tv_nexus) { |
| 1997 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 1998 | return -ENODEV; |
| 1999 | } |
| 2000 | |
| 2001 | se_sess = tv_nexus->tvn_se_sess; |
| 2002 | if (!se_sess) { |
| 2003 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 2004 | return -ENODEV; |
| 2005 | } |
| 2006 | |
| 2007 | if (tpg->tv_tpg_port_count != 0) { |
| 2008 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 2009 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
| 2010 | " active TPG port count: %d\n", |
| 2011 | tpg->tv_tpg_port_count); |
| 2012 | return -EBUSY; |
| 2013 | } |
| 2014 | |
| 2015 | if (tpg->tv_tpg_vhost_count != 0) { |
| 2016 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 2017 | pr_err("Unable to remove TCM_vhost I_T Nexus with" |
| 2018 | " active TPG vhost count: %d\n", |
| 2019 | tpg->tv_tpg_vhost_count); |
| 2020 | return -EBUSY; |
| 2021 | } |
| 2022 | |
| 2023 | pr_debug("TCM_vhost_ConfigFS: Removing I_T Nexus to emulated" |
| 2024 | " %s Initiator Port: %s\n", vhost_scsi_dump_proto_id(tpg->tport), |
| 2025 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
| 2026 | |
| 2027 | vhost_scsi_free_cmd_map_res(se_sess); |
| 2028 | /* |
| 2029 | * Release the SCSI I_T Nexus to the emulated vhost Target Port |
| 2030 | */ |
| 2031 | target_remove_session(se_sess); |
| 2032 | tpg->tpg_nexus = NULL; |
| 2033 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 2034 | |
| 2035 | kfree(tv_nexus); |
| 2036 | return 0; |
| 2037 | } |
| 2038 | |
| 2039 | static ssize_t vhost_scsi_tpg_nexus_show(struct config_item *item, char *page) |
| 2040 | { |
| 2041 | struct se_portal_group *se_tpg = to_tpg(item); |
| 2042 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 2043 | struct vhost_scsi_tpg, se_tpg); |
| 2044 | struct vhost_scsi_nexus *tv_nexus; |
| 2045 | ssize_t ret; |
| 2046 | |
| 2047 | mutex_lock(&tpg->tv_tpg_mutex); |
| 2048 | tv_nexus = tpg->tpg_nexus; |
| 2049 | if (!tv_nexus) { |
| 2050 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 2051 | return -ENODEV; |
| 2052 | } |
| 2053 | ret = snprintf(page, PAGE_SIZE, "%s\n", |
| 2054 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); |
| 2055 | mutex_unlock(&tpg->tv_tpg_mutex); |
| 2056 | |
| 2057 | return ret; |
| 2058 | } |
| 2059 | |
| 2060 | static ssize_t vhost_scsi_tpg_nexus_store(struct config_item *item, |
| 2061 | const char *page, size_t count) |
| 2062 | { |
| 2063 | struct se_portal_group *se_tpg = to_tpg(item); |
| 2064 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 2065 | struct vhost_scsi_tpg, se_tpg); |
| 2066 | struct vhost_scsi_tport *tport_wwn = tpg->tport; |
| 2067 | unsigned char i_port[VHOST_SCSI_NAMELEN], *ptr, *port_ptr; |
| 2068 | int ret; |
| 2069 | /* |
| 2070 | * Shutdown the active I_T nexus if 'NULL' is passed.. |
| 2071 | */ |
| 2072 | if (!strncmp(page, "NULL", 4)) { |
| 2073 | ret = vhost_scsi_drop_nexus(tpg); |
| 2074 | return (!ret) ? count : ret; |
| 2075 | } |
| 2076 | /* |
| 2077 | * Otherwise make sure the passed virtual Initiator port WWN matches |
| 2078 | * the fabric protocol_id set in vhost_scsi_make_tport(), and call |
| 2079 | * vhost_scsi_make_nexus(). |
| 2080 | */ |
| 2081 | if (strlen(page) >= VHOST_SCSI_NAMELEN) { |
| 2082 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
| 2083 | " max: %d\n", page, VHOST_SCSI_NAMELEN); |
| 2084 | return -EINVAL; |
| 2085 | } |
| 2086 | snprintf(&i_port[0], VHOST_SCSI_NAMELEN, "%s", page); |
| 2087 | |
| 2088 | ptr = strstr(i_port, "naa."); |
| 2089 | if (ptr) { |
| 2090 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { |
| 2091 | pr_err("Passed SAS Initiator Port %s does not" |
| 2092 | " match target port protoid: %s\n", i_port, |
| 2093 | vhost_scsi_dump_proto_id(tport_wwn)); |
| 2094 | return -EINVAL; |
| 2095 | } |
| 2096 | port_ptr = &i_port[0]; |
| 2097 | goto check_newline; |
| 2098 | } |
| 2099 | ptr = strstr(i_port, "fc."); |
| 2100 | if (ptr) { |
| 2101 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { |
| 2102 | pr_err("Passed FCP Initiator Port %s does not" |
| 2103 | " match target port protoid: %s\n", i_port, |
| 2104 | vhost_scsi_dump_proto_id(tport_wwn)); |
| 2105 | return -EINVAL; |
| 2106 | } |
| 2107 | port_ptr = &i_port[3]; /* Skip over "fc." */ |
| 2108 | goto check_newline; |
| 2109 | } |
| 2110 | ptr = strstr(i_port, "iqn."); |
| 2111 | if (ptr) { |
| 2112 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { |
| 2113 | pr_err("Passed iSCSI Initiator Port %s does not" |
| 2114 | " match target port protoid: %s\n", i_port, |
| 2115 | vhost_scsi_dump_proto_id(tport_wwn)); |
| 2116 | return -EINVAL; |
| 2117 | } |
| 2118 | port_ptr = &i_port[0]; |
| 2119 | goto check_newline; |
| 2120 | } |
| 2121 | pr_err("Unable to locate prefix for emulated Initiator Port:" |
| 2122 | " %s\n", i_port); |
| 2123 | return -EINVAL; |
| 2124 | /* |
| 2125 | * Clear any trailing newline for the NAA WWN |
| 2126 | */ |
| 2127 | check_newline: |
| 2128 | if (i_port[strlen(i_port)-1] == '\n') |
| 2129 | i_port[strlen(i_port)-1] = '\0'; |
| 2130 | |
| 2131 | ret = vhost_scsi_make_nexus(tpg, port_ptr); |
| 2132 | if (ret < 0) |
| 2133 | return ret; |
| 2134 | |
| 2135 | return count; |
| 2136 | } |
| 2137 | |
| 2138 | CONFIGFS_ATTR(vhost_scsi_tpg_, nexus); |
| 2139 | |
| 2140 | static struct configfs_attribute *vhost_scsi_tpg_attrs[] = { |
| 2141 | &vhost_scsi_tpg_attr_nexus, |
| 2142 | NULL, |
| 2143 | }; |
| 2144 | |
| 2145 | static struct se_portal_group * |
| 2146 | vhost_scsi_make_tpg(struct se_wwn *wwn, const char *name) |
| 2147 | { |
| 2148 | struct vhost_scsi_tport *tport = container_of(wwn, |
| 2149 | struct vhost_scsi_tport, tport_wwn); |
| 2150 | |
| 2151 | struct vhost_scsi_tpg *tpg; |
| 2152 | u16 tpgt; |
| 2153 | int ret; |
| 2154 | |
| 2155 | if (strstr(name, "tpgt_") != name) |
| 2156 | return ERR_PTR(-EINVAL); |
| 2157 | if (kstrtou16(name + 5, 10, &tpgt) || tpgt >= VHOST_SCSI_MAX_TARGET) |
| 2158 | return ERR_PTR(-EINVAL); |
| 2159 | |
| 2160 | tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); |
| 2161 | if (!tpg) { |
| 2162 | pr_err("Unable to allocate struct vhost_scsi_tpg"); |
| 2163 | return ERR_PTR(-ENOMEM); |
| 2164 | } |
| 2165 | mutex_init(&tpg->tv_tpg_mutex); |
| 2166 | INIT_LIST_HEAD(&tpg->tv_tpg_list); |
| 2167 | tpg->tport = tport; |
| 2168 | tpg->tport_tpgt = tpgt; |
| 2169 | |
| 2170 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
| 2171 | if (ret < 0) { |
| 2172 | kfree(tpg); |
| 2173 | return NULL; |
| 2174 | } |
| 2175 | mutex_lock(&vhost_scsi_mutex); |
| 2176 | list_add_tail(&tpg->tv_tpg_list, &vhost_scsi_list); |
| 2177 | mutex_unlock(&vhost_scsi_mutex); |
| 2178 | |
| 2179 | return &tpg->se_tpg; |
| 2180 | } |
| 2181 | |
| 2182 | static void vhost_scsi_drop_tpg(struct se_portal_group *se_tpg) |
| 2183 | { |
| 2184 | struct vhost_scsi_tpg *tpg = container_of(se_tpg, |
| 2185 | struct vhost_scsi_tpg, se_tpg); |
| 2186 | |
| 2187 | mutex_lock(&vhost_scsi_mutex); |
| 2188 | list_del(&tpg->tv_tpg_list); |
| 2189 | mutex_unlock(&vhost_scsi_mutex); |
| 2190 | /* |
| 2191 | * Release the virtual I_T Nexus for this vhost TPG |
| 2192 | */ |
| 2193 | vhost_scsi_drop_nexus(tpg); |
| 2194 | /* |
| 2195 | * Deregister the se_tpg from TCM.. |
| 2196 | */ |
| 2197 | core_tpg_deregister(se_tpg); |
| 2198 | kfree(tpg); |
| 2199 | } |
| 2200 | |
| 2201 | static struct se_wwn * |
| 2202 | vhost_scsi_make_tport(struct target_fabric_configfs *tf, |
| 2203 | struct config_group *group, |
| 2204 | const char *name) |
| 2205 | { |
| 2206 | struct vhost_scsi_tport *tport; |
| 2207 | char *ptr; |
| 2208 | u64 wwpn = 0; |
| 2209 | int off = 0; |
| 2210 | |
| 2211 | /* if (vhost_scsi_parse_wwn(name, &wwpn, 1) < 0) |
| 2212 | return ERR_PTR(-EINVAL); */ |
| 2213 | |
| 2214 | tport = kzalloc(sizeof(*tport), GFP_KERNEL); |
| 2215 | if (!tport) { |
| 2216 | pr_err("Unable to allocate struct vhost_scsi_tport"); |
| 2217 | return ERR_PTR(-ENOMEM); |
| 2218 | } |
| 2219 | tport->tport_wwpn = wwpn; |
| 2220 | /* |
| 2221 | * Determine the emulated Protocol Identifier and Target Port Name |
| 2222 | * based on the incoming configfs directory name. |
| 2223 | */ |
| 2224 | ptr = strstr(name, "naa."); |
| 2225 | if (ptr) { |
| 2226 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; |
| 2227 | goto check_len; |
| 2228 | } |
| 2229 | ptr = strstr(name, "fc."); |
| 2230 | if (ptr) { |
| 2231 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; |
| 2232 | off = 3; /* Skip over "fc." */ |
| 2233 | goto check_len; |
| 2234 | } |
| 2235 | ptr = strstr(name, "iqn."); |
| 2236 | if (ptr) { |
| 2237 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; |
| 2238 | goto check_len; |
| 2239 | } |
| 2240 | |
| 2241 | pr_err("Unable to locate prefix for emulated Target Port:" |
| 2242 | " %s\n", name); |
| 2243 | kfree(tport); |
| 2244 | return ERR_PTR(-EINVAL); |
| 2245 | |
| 2246 | check_len: |
| 2247 | if (strlen(name) >= VHOST_SCSI_NAMELEN) { |
| 2248 | pr_err("Emulated %s Address: %s, exceeds" |
| 2249 | " max: %d\n", name, vhost_scsi_dump_proto_id(tport), |
| 2250 | VHOST_SCSI_NAMELEN); |
| 2251 | kfree(tport); |
| 2252 | return ERR_PTR(-EINVAL); |
| 2253 | } |
| 2254 | snprintf(&tport->tport_name[0], VHOST_SCSI_NAMELEN, "%s", &name[off]); |
| 2255 | |
| 2256 | pr_debug("TCM_VHost_ConfigFS: Allocated emulated Target" |
| 2257 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), name); |
| 2258 | |
| 2259 | return &tport->tport_wwn; |
| 2260 | } |
| 2261 | |
| 2262 | static void vhost_scsi_drop_tport(struct se_wwn *wwn) |
| 2263 | { |
| 2264 | struct vhost_scsi_tport *tport = container_of(wwn, |
| 2265 | struct vhost_scsi_tport, tport_wwn); |
| 2266 | |
| 2267 | pr_debug("TCM_VHost_ConfigFS: Deallocating emulated Target" |
| 2268 | " %s Address: %s\n", vhost_scsi_dump_proto_id(tport), |
| 2269 | tport->tport_name); |
| 2270 | |
| 2271 | kfree(tport); |
| 2272 | } |
| 2273 | |
| 2274 | static ssize_t |
| 2275 | vhost_scsi_wwn_version_show(struct config_item *item, char *page) |
| 2276 | { |
| 2277 | return sprintf(page, "TCM_VHOST fabric module %s on %s/%s" |
| 2278 | "on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
| 2279 | utsname()->machine); |
| 2280 | } |
| 2281 | |
| 2282 | CONFIGFS_ATTR_RO(vhost_scsi_wwn_, version); |
| 2283 | |
| 2284 | static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { |
| 2285 | &vhost_scsi_wwn_attr_version, |
| 2286 | NULL, |
| 2287 | }; |
| 2288 | |
| 2289 | static const struct target_core_fabric_ops vhost_scsi_ops = { |
| 2290 | .module = THIS_MODULE, |
| 2291 | .fabric_name = "vhost", |
| 2292 | .tpg_get_wwn = vhost_scsi_get_fabric_wwn, |
| 2293 | .tpg_get_tag = vhost_scsi_get_tpgt, |
| 2294 | .tpg_check_demo_mode = vhost_scsi_check_true, |
| 2295 | .tpg_check_demo_mode_cache = vhost_scsi_check_true, |
| 2296 | .tpg_check_demo_mode_write_protect = vhost_scsi_check_false, |
| 2297 | .tpg_check_prod_mode_write_protect = vhost_scsi_check_false, |
| 2298 | .tpg_check_prot_fabric_only = vhost_scsi_check_prot_fabric_only, |
| 2299 | .tpg_get_inst_index = vhost_scsi_tpg_get_inst_index, |
| 2300 | .release_cmd = vhost_scsi_release_cmd, |
| 2301 | .check_stop_free = vhost_scsi_check_stop_free, |
| 2302 | .sess_get_index = vhost_scsi_sess_get_index, |
| 2303 | .sess_get_initiator_sid = NULL, |
| 2304 | .write_pending = vhost_scsi_write_pending, |
| 2305 | .write_pending_status = vhost_scsi_write_pending_status, |
| 2306 | .set_default_node_attributes = vhost_scsi_set_default_node_attrs, |
| 2307 | .get_cmd_state = vhost_scsi_get_cmd_state, |
| 2308 | .queue_data_in = vhost_scsi_queue_data_in, |
| 2309 | .queue_status = vhost_scsi_queue_status, |
| 2310 | .queue_tm_rsp = vhost_scsi_queue_tm_rsp, |
| 2311 | .aborted_task = vhost_scsi_aborted_task, |
| 2312 | /* |
| 2313 | * Setup callers for generic logic in target_core_fabric_configfs.c |
| 2314 | */ |
| 2315 | .fabric_make_wwn = vhost_scsi_make_tport, |
| 2316 | .fabric_drop_wwn = vhost_scsi_drop_tport, |
| 2317 | .fabric_make_tpg = vhost_scsi_make_tpg, |
| 2318 | .fabric_drop_tpg = vhost_scsi_drop_tpg, |
| 2319 | .fabric_post_link = vhost_scsi_port_link, |
| 2320 | .fabric_pre_unlink = vhost_scsi_port_unlink, |
| 2321 | |
| 2322 | .tfc_wwn_attrs = vhost_scsi_wwn_attrs, |
| 2323 | .tfc_tpg_base_attrs = vhost_scsi_tpg_attrs, |
| 2324 | .tfc_tpg_attrib_attrs = vhost_scsi_tpg_attrib_attrs, |
| 2325 | }; |
| 2326 | |
| 2327 | static int __init vhost_scsi_init(void) |
| 2328 | { |
| 2329 | int ret = -ENOMEM; |
| 2330 | |
| 2331 | pr_debug("TCM_VHOST fabric module %s on %s/%s" |
| 2332 | " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname, |
| 2333 | utsname()->machine); |
| 2334 | |
| 2335 | /* |
| 2336 | * Use our own dedicated workqueue for submitting I/O into |
| 2337 | * target core to avoid contention within system_wq. |
| 2338 | */ |
| 2339 | vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0); |
| 2340 | if (!vhost_scsi_workqueue) |
| 2341 | goto out; |
| 2342 | |
| 2343 | ret = vhost_scsi_register(); |
| 2344 | if (ret < 0) |
| 2345 | goto out_destroy_workqueue; |
| 2346 | |
| 2347 | ret = target_register_template(&vhost_scsi_ops); |
| 2348 | if (ret < 0) |
| 2349 | goto out_vhost_scsi_deregister; |
| 2350 | |
| 2351 | return 0; |
| 2352 | |
| 2353 | out_vhost_scsi_deregister: |
| 2354 | vhost_scsi_deregister(); |
| 2355 | out_destroy_workqueue: |
| 2356 | destroy_workqueue(vhost_scsi_workqueue); |
| 2357 | out: |
| 2358 | return ret; |
| 2359 | }; |
| 2360 | |
| 2361 | static void vhost_scsi_exit(void) |
| 2362 | { |
| 2363 | target_unregister_template(&vhost_scsi_ops); |
| 2364 | vhost_scsi_deregister(); |
| 2365 | destroy_workqueue(vhost_scsi_workqueue); |
| 2366 | }; |
| 2367 | |
| 2368 | MODULE_DESCRIPTION("VHOST_SCSI series fabric driver"); |
| 2369 | MODULE_ALIAS("tcm_vhost"); |
| 2370 | MODULE_LICENSE("GPL"); |
| 2371 | module_init(vhost_scsi_init); |
| 2372 | module_exit(vhost_scsi_exit); |