1/*- 2 * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27/* 28 | $Id: isc_cam.c 998 2009-12-20 10:32:45Z danny $ 29 */ 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD$"); 32 33#include "opt_iscsi_initiator.h" 34 35#include <sys/param.h> 36#include <sys/kernel.h> 37#include <sys/callout.h> 38#if __FreeBSD_version >= 700000 39#include <sys/lock.h> 40#include <sys/mutex.h> 41#endif 42#include <sys/conf.h> 43#include <sys/systm.h> 44#include <sys/malloc.h> 45#include <sys/mbuf.h> 46#include <sys/uio.h> 47#include <sys/sysctl.h> 48#include <sys/sx.h> 49 50#include <cam/cam.h> 51#include <cam/cam_ccb.h> 52#include <cam/cam_sim.h> 53#include <cam/cam_xpt_sim.h> 54#include <cam/cam_periph.h> 55 56#include <dev/iscsi_initiator/iscsi.h> 57#include <dev/iscsi_initiator/iscsivar.h> 58 59static void 60_inq(struct cam_sim *sim, union ccb *ccb) 61{ 62 struct ccb_pathinq *cpi = &ccb->cpi; 63 isc_session_t *sp = cam_sim_softc(sim); 64 65 debug_called(8); 66 debug(3, "sid=%d target=%d lun=%d", sp->sid, ccb->ccb_h.target_id, ccb->ccb_h.target_lun); 67 68 cpi->version_num = 1; /* XXX??? */ 69 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32; 70 cpi->target_sprt = 0; 71 cpi->hba_misc = 0; 72 cpi->hba_eng_cnt = 0; 73 cpi->max_target = 0; //ISCSI_MAX_TARGETS - 1; 74 cpi->initiator_id = ISCSI_MAX_TARGETS; 75 cpi->max_lun = sp->opt.maxluns - 1; 76 cpi->bus_id = cam_sim_bus(sim); 77 cpi->base_transfer_speed = 3300; // 40000; // XXX: 78 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 79 strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 80 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 81 cpi->unit_number = cam_sim_unit(sim); 82 cpi->ccb_h.status = CAM_REQ_CMP; 83#if defined(KNOB_VALID_ADDRESS) 84 cpi->transport = XPORT_ISCSI; 85 cpi->transport_version = 0; 86#endif 87} 88 89static __inline int 90_scsi_encap(struct cam_sim *sim, union ccb *ccb) 91{ 92 int ret; 93 94#if __FreeBSD_version < 700000 95 ret = scsi_encap(sim, ccb); 96#else 97 isc_session_t *sp = cam_sim_softc(sim); 98 99 mtx_unlock(&sp->cam_mtx); 100 ret = scsi_encap(sim, ccb); 101 mtx_lock(&sp->cam_mtx); 102#endif 103 return ret; 104} 105 106void 107ic_lost_target(isc_session_t *sp, int target) 108{ 109 debug_called(8); 110 sdebug(2, "lost target=%d", target); 111 112 if(sp->cam_path != NULL) { 113 mtx_lock(&sp->cam_mtx); 114 xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); 115 xpt_free_path(sp->cam_path); 116 mtx_unlock(&sp->cam_mtx); 117 sp->cam_path = 0; // XXX 118 } 119} 120 121static void 122scan_callback(struct cam_periph *periph, union ccb *ccb) 123{ 124 isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0; 125 126 debug_called(8); 127 128 free(ccb, M_TEMP); 129 130 if(sp->flags & ISC_SCANWAIT) { 131 sp->flags &= ~ISC_SCANWAIT; 132 wakeup(sp); 133 } 134} 135 136static int 137ic_scan(isc_session_t *sp) 138{ 139 union ccb *ccb; 140 141 debug_called(8); 142 sdebug(2, "scanning sid=%d", sp->sid); 143 144 if((ccb = malloc(sizeof(union ccb), M_TEMP, M_WAITOK | M_ZERO)) == NULL) { 145 xdebug("scan failed (can't allocate CCB)"); 146 return ENOMEM; // XXX 147 } 148 149 sp->flags &= ~ISC_CAMDEVS; 150 sp->flags |= ISC_SCANWAIT; 151 152 CAM_LOCK(sp); 153 if(xpt_create_path(&sp->cam_path, NULL, cam_sim_path(sp->cam_sim), 154 0, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { 155 xdebug("can't create cam path"); 156 CAM_UNLOCK(sp); 157 free(ccb, M_TEMP); 158 return ENODEV; // XXX 159 } 160 xpt_setup_ccb(&ccb->ccb_h, sp->cam_path, 5/*priority (low)*/); 161 ccb->ccb_h.func_code = XPT_SCAN_BUS; 162 ccb->ccb_h.cbfcnp = scan_callback; 163 ccb->crcn.flags = CAM_FLAG_NONE; 164 ccb->ccb_h.spriv_ptr0 = sp; 165 166 xpt_action(ccb); 167 CAM_UNLOCK(sp); 168 169 while(sp->flags & ISC_SCANWAIT) 170 tsleep(sp, PRIBIO, "ffp", 5*hz); // the timeout time should 171 // be configurable 172 sdebug(2, "# of luns=%d", sp->target_nluns); 173 174 if(sp->target_nluns > 0) { 175 sp->flags |= ISC_CAMDEVS; 176 return 0; 177 } 178 179 return ENODEV; 180} 181 182static void 183ic_action(struct cam_sim *sim, union ccb *ccb) 184{ 185 isc_session_t *sp = cam_sim_softc(sim); 186 struct ccb_hdr *ccb_h = &ccb->ccb_h; 187 188 debug_called(8); 189 190 ccb_h->spriv_ptr0 = sp; 191 sdebug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%d retry_count=%d timeout=%d", 192 ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status, 193 ccb->ccb_h.target_id, ccb->ccb_h.target_lun, 194 ccb->ccb_h.retry_count, ccb_h->timeout); 195 if(sp == NULL) { 196 xdebug("sp == NULL! cannot happen"); 197 return; 198 } 199 switch(ccb_h->func_code) { 200 case XPT_PATH_INQ: 201 _inq(sim, ccb); 202 break; 203 204 case XPT_RESET_BUS: // (can just be a stub that does nothing and completes) 205 { 206 struct ccb_pathinq *cpi = &ccb->cpi; 207 208 debug(3, "XPT_RESET_BUS"); 209 cpi->ccb_h.status = CAM_REQ_CMP; 210 break; 211 } 212 213 case XPT_SCSI_IO: 214 { 215 struct ccb_scsiio* csio = &ccb->csio; 216 217 debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]); 218 if(sp == NULL) { 219 ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS; 220 debug(4, "xpt_done.status=%d", ccb_h->status); 221 break; 222 } 223 if(ccb_h->target_lun == CAM_LUN_WILDCARD) { 224 debug(3, "target=%d: bad lun (-1)", ccb_h->target_id); 225 ccb_h->status = CAM_LUN_INVALID; 226 break; 227 } 228 if(_scsi_encap(sim, ccb) != 0) 229 return; 230 break; 231 } 232 233 case XPT_CALC_GEOMETRY: 234 { 235 struct ccb_calc_geometry *ccg; 236 237 ccg = &ccb->ccg; 238 debug(4, "sid=%d target=%d lun=%d XPT_CALC_GEOMETRY vsize=%jd bsize=%d", 239 sp->sid, ccb->ccb_h.target_id, ccb->ccb_h.target_lun, 240 ccg->volume_size, ccg->block_size); 241 if(ccg->block_size == 0 || 242 (ccg->volume_size < ccg->block_size)) { 243 // print error message ... 244 /* XXX: what error is appropiate? */ 245 break; 246 } 247 else { 248 int lun, *off, boff; 249 250 lun = ccb->ccb_h.target_lun; 251 if(lun > ISCSI_MAX_LUNS) { 252 // XXX: 253 xdebug("lun %d > ISCSI_MAX_LUNS!\n", lun); 254 lun %= ISCSI_MAX_LUNS; 255 } 256 off = &sp->target_lun[lun / (sizeof(int)*8)]; 257 boff = BIT(lun % (sizeof(int)*8)); 258 debug(4, "sp->target_nluns=%d *off=%x boff=%x", 259 sp->target_nluns, *off, boff); 260 261 if((*off & boff) == 0) { 262 sp->target_nluns++; 263 *off |= boff; 264 } 265 cam_calc_geometry(ccg, /*extended*/1); 266 } 267 break; 268 } 269 270 case XPT_GET_TRAN_SETTINGS: 271 default: 272 ccb_h->status = CAM_REQ_INVALID; 273 break; 274 } 275#if __FreeBSD_version < 700000 276 XPT_DONE(sp, ccb); 277#else 278 xpt_done(ccb); 279#endif 280 return; 281} 282 283static void 284ic_poll(struct cam_sim *sim) 285{ 286 debug_called(4); 287 288} 289 290int 291ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp) 292{ 293 debug_called(8); 294 295 if(sp && sp->cam_sim) { 296 cp->path_id = cam_sim_path(sp->cam_sim); 297 cp->target_id = 0; 298 cp->target_nluns = ISCSI_MAX_LUNS; // XXX: -1? 299 return 0; 300 } 301 return ENXIO; 302} 303 304void 305ic_destroy(isc_session_t *sp ) 306{ 307 debug_called(8); 308 309 if(sp->cam_path != NULL) { 310 sdebug(2, "name=%s unit=%d", 311 cam_sim_name(sp->cam_sim), cam_sim_unit(sp->cam_sim)); 312 CAM_LOCK(sp); 313#if 0 314 xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL); 315#else 316 xpt_async(XPT_RESET_BUS, sp->cam_path, NULL); 317#endif 318 xpt_free_path(sp->cam_path); 319 xpt_bus_deregister(cam_sim_path(sp->cam_sim)); 320 cam_sim_free(sp->cam_sim, TRUE /*free_devq*/); 321 322 CAM_UNLOCK(sp); 323 sdebug(2, "done"); 324 } 325} 326 327int 328ic_init(isc_session_t *sp) 329{ 330 struct cam_sim *sim; 331 struct cam_devq *devq; 332 333 debug_called(8); 334 335 if((devq = cam_simq_alloc(256)) == NULL) 336 return ENOMEM; 337 338#if __FreeBSD_version >= 700000 339 mtx_init(&sp->cam_mtx, "isc-cam", NULL, MTX_DEF); 340#else 341 isp->cam_mtx = Giant; 342#endif 343 sim = cam_sim_alloc(ic_action, 344 ic_poll, 345 "iscsi", 346 sp, 347 sp->sid, // unit 348#if __FreeBSD_version >= 700000 349 &sp->cam_mtx, 350#endif 351 1, // max_dev_transactions 352 0, // max_tagged_dev_transactions 353 devq); 354 if(sim == NULL) { 355 cam_simq_free(devq); 356#if __FreeBSD_version >= 700000 357 mtx_destroy(&sp->cam_mtx); 358#endif 359 return ENXIO; 360 } 361 362 CAM_LOCK(sp); 363 if(xpt_bus_register(sim, 364#if __FreeBSD_version >= 700000 365 NULL, 366#endif 367 0/*bus_number*/) != CAM_SUCCESS) { 368 369 cam_sim_free(sim, /*free_devq*/TRUE); 370 CAM_UNLOCK(sp); 371#if __FreeBSD_version >= 700000 372 mtx_destroy(&sp->cam_mtx); 373#endif 374 return ENXIO; 375 } 376 sp->cam_sim = sim; 377 CAM_UNLOCK(sp); 378 379 sdebug(1, "cam subsystem initialized"); 380 381 ic_scan(sp); 382 383 return 0; 384} 385