isc_cam.c revision 185289
1272578Sbrd/*- 2272578Sbrd * Copyright (c) 2005-2008 Daniel Braniss <danny@cs.huji.ac.il> 3272578Sbrd * All rights reserved. 4272578Sbrd * 5272578Sbrd * Redistribution and use in source and binary forms, with or without 6272578Sbrd * modification, are permitted provided that the following conditions 7272578Sbrd * are met: 8272578Sbrd * 1. Redistributions of source code must retain the above copyright 9272578Sbrd * notice, this list of conditions and the following disclaimer. 10272578Sbrd * 2. Redistributions in binary form must reproduce the above copyright 11274727Sbrd * notice, this list of conditions and the following disclaimer in the 12274727Sbrd * documentation and/or other materials provided with the distribution. 13272578Sbrd * 14272578Sbrd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15274727Sbrd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16272578Sbrd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17272578Sbrd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18272578Sbrd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19272578Sbrd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20272578Sbrd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21272578Sbrd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22272578Sbrd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23272578Sbrd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24272578Sbrd * SUCH DAMAGE. 25274727Sbrd * 26274727Sbrd */ 27274727Sbrd 28272578Sbrd#include <sys/cdefs.h> 29272578Sbrd__FBSDID("$FreeBSD: head/sys/dev/iscsi/initiator/isc_cam.c 185289 2008-11-25 07:17:11Z scottl $"); 30273772Sbapt 31273772Sbapt#include "opt_iscsi_initiator.h" 32273772Sbapt 33273772Sbapt#include <sys/param.h> 34273772Sbapt#include <sys/kernel.h> 35273772Sbapt#include <sys/callout.h> 36274727Sbrd#if __FreeBSD_version >= 700000 37274727Sbrd#include <sys/lock.h> 38274727Sbrd#include <sys/mutex.h> 39273772Sbapt#endif 40272578Sbrd#include <sys/conf.h> 41273779Sbapt#include <sys/systm.h> 42273779Sbapt#include <sys/malloc.h> 43273779Sbapt#include <sys/mbuf.h> 44273779Sbapt#include <sys/uio.h> 45273779Sbapt#include <sys/sysctl.h> 46273779Sbapt 47273779Sbapt#include <cam/cam.h> 48274727Sbrd#include <cam/cam_ccb.h> 49274727Sbrd#include <cam/cam_sim.h> 50274727Sbrd#include <cam/cam_xpt_sim.h> 51274727Sbrd#include <cam/cam_periph.h> 52274727Sbrd 53274727Sbrd#include <dev/iscsi/initiator/iscsi.h> 54274727Sbrd#include <dev/iscsi/initiator/iscsivar.h> 55274727Sbrd 56274727Sbrd// XXX: untested/incomplete 57274727Sbrdvoid 58274727Sbrdic_freeze(isc_session_t *sp) 59273779Sbapt{ 60273779Sbapt debug_called(8); 61273791Sbapt#if 0 62273791Sbapt sdebug(2, "freezing path=%p", sp->cam_path == NULL? 0: sp->cam_path); 63273791Sbapt if((sp->cam_path != NULL) && !(sp->flags & ISC_FROZEN)) { 64273791Sbapt xpt_freeze_devq(sp->cam_path, 1); 65273791Sbapt } 66273791Sbapt#endif 67273791Sbapt sp->flags |= ISC_FROZEN; 68274727Sbrd} 69274727Sbrd 70273791Sbapt// XXX: untested/incomplete 71273791Sbaptvoid 72273791Sbaptic_release(isc_session_t *sp) 73273791Sbapt{ 74285092Sbapt debug_called(8); 75285092Sbapt#if 0 76285092Sbapt sdebug(2, "release path=%p", sp->cam_path == NULL? 0: sp->cam_path); 77285092Sbapt if((sp->cam_path != NULL) && (sp->flags & ISC_FROZEN)) { 78285092Sbapt xpt_release_devq(sp->cam_path, 1, TRUE); 79285092Sbapt } 80285092Sbapt#endif 81285092Sbapt sp->flags &= ~ISC_FROZEN; 82285092Sbapt} 83285092Sbapt 84287084Sbaptvoid 85287084Sbaptic_lost_target(isc_session_t *sp, int target) 86287084Sbapt{ 87287084Sbapt struct isc_softc *isp = sp->isc; 88287084Sbapt 89287084Sbapt debug_called(8); 90287084Sbapt sdebug(2, "target=%d", target); 91287084Sbapt if(sp->cam_path != NULL) { 92287084Sbapt mtx_lock(&isp->cam_mtx); 93287084Sbapt xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); 94287084Sbapt xpt_free_path(sp->cam_path); 95287084Sbapt mtx_unlock(&isp->cam_mtx); 96287084Sbapt sp->cam_path = 0; // XXX 97287084Sbapt } 98287084Sbapt} 99287084Sbapt 100287084Sbaptstatic void 101287084Sbapt_scan_callback(struct cam_periph *periph, union ccb *ccb) 102287084Sbapt{ 103287084Sbapt isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0; 104287084Sbapt 105287084Sbapt debug_called(8); 106287084Sbapt 107287084Sbapt free(ccb, M_TEMP); 108287084Sbapt 109287084Sbapt if(sp->flags & ISC_FFPWAIT) { 110272578Sbrd sp->flags &= ~ISC_FFPWAIT; 111272578Sbrd wakeup(sp); 112272578Sbrd } 113273772Sbapt} 114273779Sbapt 115273791Sbaptstatic void 116285092Sbapt_scan_target(isc_session_t *sp, int target) 117287084Sbapt{ 118272578Sbrd union ccb *ccb; 119 120 debug_called(8); 121 sdebug(2, "target=%d", target); 122 123 if((ccb = malloc(sizeof(union ccb), M_TEMP, M_WAITOK | M_ZERO)) == NULL) { 124 xdebug("scan failed (can't allocate CCB)"); 125 return; 126 } 127 CAM_LOCK(sp->isc); 128 xpt_setup_ccb(&ccb->ccb_h, sp->cam_path, 5/*priority (low)*/); 129 ccb->ccb_h.func_code = XPT_SCAN_BUS; 130 ccb->ccb_h.cbfcnp = _scan_callback; 131 ccb->crcn.flags = CAM_FLAG_NONE; 132 ccb->ccb_h.spriv_ptr0 = sp; 133 134 xpt_action(ccb); 135 CAM_UNLOCK(sp->isc); 136} 137 138int 139ic_fullfeature(struct cdev *dev) 140{ 141 struct isc_softc *isp = dev->si_drv1; 142 isc_session_t *sp = (isc_session_t *)dev->si_drv2; 143 144 debug_called(8); 145 sdebug(3, "dev=%d sc=%p", dev2unit(dev), isp); 146 147 sp->flags &= ~ISC_FFPHASE; 148 sp->flags |= ISC_FFPWAIT; 149 150 CAM_LOCK(isp); 151 if(xpt_create_path(&sp->cam_path, xpt_periph, cam_sim_path(sp->isc->cam_sim), 152 sp->sid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 153 xdebug("can't create cam path"); 154 CAM_UNLOCK(isp); 155 return ENODEV; // XXX 156 } 157 CAM_UNLOCK(isp); 158 159 _scan_target(sp, sp->sid); 160 161 while(sp->flags & ISC_FFPWAIT) 162 tsleep(sp, PRIBIO, "ffp", 5*hz); // the timeout time should 163 // be configurable 164 if(sp->target_nluns > 0) { 165 sp->flags |= ISC_FFPHASE; 166 return 0; 167 } 168 169 return ENODEV; 170} 171 172static void 173_inq(struct cam_sim *sim, union ccb *ccb, int maxluns) 174{ 175 struct ccb_pathinq *cpi = &ccb->cpi; 176 177 debug_called(4); 178 179 cpi->version_num = 1; /* XXX??? */ 180 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32; 181 cpi->target_sprt = 0; 182 cpi->hba_misc = 0; 183 cpi->hba_eng_cnt = 0; 184 cpi->max_target = ISCSI_MAX_TARGETS - 1; 185 cpi->initiator_id = ISCSI_MAX_TARGETS; 186 cpi->max_lun = maxluns; 187 cpi->bus_id = cam_sim_bus(sim); 188 cpi->base_transfer_speed = 3300; 189 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 190 strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 191 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 192 cpi->unit_number = cam_sim_unit(sim); 193 cpi->ccb_h.status = CAM_REQ_CMP; 194} 195 196static __inline int 197_scsi_encap(struct cam_sim *sim, union ccb *ccb) 198{ 199 int ret; 200 201#if __FreeBSD_version < 700000 202 ret = scsi_encap(sim, ccb); 203#else 204 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim); 205 206 mtx_unlock(&isp->cam_mtx); 207 ret = scsi_encap(sim, ccb); 208 mtx_lock(&isp->cam_mtx); 209#endif 210 return ret; 211} 212 213static void 214ic_action(struct cam_sim *sim, union ccb *ccb) 215{ 216 struct ccb_hdr *ccb_h = &ccb->ccb_h; 217 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim); 218 isc_session_t *sp; 219 220 debug_called(8); 221 222 if((ccb_h->target_id != CAM_TARGET_WILDCARD) && (ccb_h->target_id < MAX_SESSIONS)) 223 sp = isp->sessions[ccb_h->target_id]; 224 else 225 sp = NULL; 226 227 ccb_h->spriv_ptr0 = sp; 228 229 debug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%d retry_count=%d timeout=%d", 230 ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status, 231 ccb->ccb_h.target_id, ccb->ccb_h.target_lun, 232 ccb->ccb_h.retry_count, ccb_h->timeout); 233 /* 234 | first quick check 235 */ 236 switch(ccb_h->func_code) { 237 default: 238 // XXX: maybe check something else? 239 break; 240 241 case XPT_SCSI_IO: 242 case XPT_RESET_DEV: 243 case XPT_GET_TRAN_SETTINGS: 244 case XPT_SET_TRAN_SETTINGS: 245 case XPT_CALC_GEOMETRY: 246 if(sp == NULL) { 247 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 248#if __FreeBSD_version < 700000 249 XPT_DONE(isp, ccb); 250#else 251 xpt_done(ccb); 252#endif 253 return; 254 } 255 break; 256 257 case XPT_PATH_INQ: 258 case XPT_NOOP: 259 if(sp == NULL && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) { 260 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 261#if __FreeBSD_version < 700000 262 XPT_DONE(isp, ccb); 263#else 264 xpt_done(ccb); 265#endif 266 debug(4, "status = CAM_DEV_NOT_THERE"); 267 return; 268 } 269 } 270 271 switch(ccb_h->func_code) { 272 273 case XPT_PATH_INQ: 274 _inq(sim, ccb, (sp? sp->opt.maxluns: ISCSI_MAX_LUNS) - 1); 275 break; 276 277 case XPT_RESET_BUS: // (can just be a stub that does nothing and completes) 278 { 279 struct ccb_pathinq *cpi = &ccb->cpi; 280 281 debug(3, "XPT_RESET_BUS"); 282 cpi->ccb_h.status = CAM_REQ_CMP; 283 break; 284 } 285 286 case XPT_SCSI_IO: 287 { 288 struct ccb_scsiio* csio = &ccb->csio; 289 290 debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]); 291 if(sp == NULL) { 292 ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS; 293 debug(4, "xpt_done.status=%d", ccb_h->status); 294 break; 295 } 296 if(ccb_h->target_lun == CAM_LUN_WILDCARD) { 297 debug(3, "target=%d: bad lun (-1)", ccb_h->target_id); 298 ccb_h->status = CAM_LUN_INVALID; 299 break; 300 } 301 if(_scsi_encap(sim, ccb) != 0) 302 return; 303 break; 304 } 305 306 case XPT_CALC_GEOMETRY: 307 { 308 struct ccb_calc_geometry *ccg; 309 310 ccg = &ccb->ccg; 311 debug(6, "XPT_CALC_GEOMETRY vsize=%jd bsize=%d", ccg->volume_size, ccg->block_size); 312 if(ccg->block_size == 0 || 313 (ccg->volume_size < ccg->block_size)) { 314 // print error message ... 315 /* XXX: what error is appropiate? */ 316 break; 317 } else 318 cam_calc_geometry(ccg, /*extended*/1); 319 break; 320 } 321 322 case XPT_GET_TRAN_SETTINGS: 323 default: 324 ccb_h->status = CAM_REQ_INVALID; 325 break; 326 } 327#if __FreeBSD_version < 700000 328 XPT_DONE(isp, ccb); 329#else 330 xpt_done(ccb); 331#endif 332 return; 333} 334 335static void 336ic_poll(struct cam_sim *sim) 337{ 338 debug_called(8); 339 340} 341 342int 343ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp) 344{ 345 int i; 346 347 debug_called(8); 348 349 if(sp && sp->isc->cam_sim) { 350 cp->path_id = cam_sim_path(sp->isc->cam_sim); 351 cp->target_id = sp->sid; 352 cp->target_nluns = sp->target_nluns; // XXX: -1? 353 for(i = 0; i < cp->target_nluns; i++) 354 cp->target_lun[i] = sp->target_lun[i]; 355 return 0; 356 } 357 return ENXIO; 358} 359 360void 361ic_destroy(struct isc_softc *isp) 362{ 363 debug_called(8); 364 365 CAM_LOCK(isp); // can't harm :-) 366 367 xpt_async(AC_LOST_DEVICE, isp->cam_path, NULL); 368 xpt_free_path(isp->cam_path); 369 370 xpt_bus_deregister(cam_sim_path(isp->cam_sim)); 371 cam_sim_free(isp->cam_sim, TRUE /*free_devq*/); 372 373 CAM_UNLOCK(isp); 374} 375 376int 377ic_init(struct isc_softc *isp) 378{ 379 struct cam_sim *sim; 380 struct cam_devq *devq; 381 struct cam_path *path; 382 383 if((devq = cam_simq_alloc(256)) == NULL) 384 return ENOMEM; 385 386#if __FreeBSD_version >= 700000 387 mtx_init(&isp->cam_mtx, "isc-cam", NULL, MTX_DEF); 388#else 389 isp->cam_mtx = Giant; 390#endif 391 sim = cam_sim_alloc(ic_action, ic_poll, 392 "iscsi", isp, 0/*unit*/, 393#if __FreeBSD_version >= 700000 394 &isp->cam_mtx, 395#endif 396 1/*max_dev_transactions*/, 397 100/*max_tagged_dev_transactions*/, 398 devq); 399 if(sim == NULL) { 400 cam_simq_free(devq); 401#if __FreeBSD_version >= 700000 402 mtx_destroy(&isp->cam_mtx); 403#endif 404 return ENXIO; 405 } 406 CAM_LOCK(isp); 407 if(xpt_bus_register(sim, 408#if __FreeBSD_version >= 700000 409 NULL, 410#endif 411 0/*bus_number*/) != CAM_SUCCESS) 412 goto bad; 413 414 if(xpt_create_path(&path, xpt_periph, cam_sim_path(sim), 415 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 416 xpt_bus_deregister(cam_sim_path(sim)); 417 goto bad; 418 } 419 420 CAM_UNLOCK(isp); 421 422 isp->cam_sim = sim; 423 isp->cam_path = path; 424 425 debug(2, "cam subsystem initialized"); // XXX: add dev ... 426 debug(4, "sim=%p path=%p", sim, path); 427 return 0; 428 429 bad: 430 cam_sim_free(sim, /*free_devq*/TRUE); 431 CAM_UNLOCK(isp); 432#if __FreeBSD_version >= 700000 433 mtx_destroy(&isp->cam_mtx); 434#endif 435 return ENXIO; 436} 437