1 /*-
2 * Copyright (c) 2005-2008 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 * $FreeBSD: src/sys/dev/iscsi/initiator/isc_cam.c,v 1.3 2008/11/25 07:17:11 scottl Exp $
27 */
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/callout.h>
32 #include <sys/lock.h>
33 #include <sys/conf.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/mbuf.h>
37 #include <sys/uio.h>
38 #include <sys/sysctl.h>
39 #include <sys/eventhandler.h>
40 #include <sys/globaldata.h>
41
42 #include <bus/cam/cam.h>
43 #include <bus/cam/cam_ccb.h>
44 #include <bus/cam/cam_sim.h>
45 #include <bus/cam/cam_xpt.h>
46 #include <bus/cam/cam_xpt_sim.h>
47 #include <bus/cam/cam_xpt_periph.h>
48 #include <bus/cam/cam_periph.h>
49
50 #include <dev/disk/iscsi/initiator/iscsi.h>
51 #include <dev/disk/iscsi/initiator/iscsivar.h>
52
53 // XXX: untested/incomplete
54 void
ic_freeze(isc_session_t * sp)55 ic_freeze(isc_session_t *sp)
56 {
57 debug_called(8);
58 #if 0
59 sdebug(2, "freezing path=%p", sp->cam_path == NULL? 0: sp->cam_path);
60 if((sp->cam_path != NULL) && !(sp->flags & ISC_FROZEN)) {
61 xpt_freeze_devq(sp->cam_path, 1);
62 }
63 #endif
64 sp->flags |= ISC_FROZEN;
65 }
66
67 // XXX: untested/incomplete
68 void
ic_release(isc_session_t * sp)69 ic_release(isc_session_t *sp)
70 {
71 debug_called(8);
72 #if 0
73 sdebug(2, "release path=%p", sp->cam_path == NULL? 0: sp->cam_path);
74 if((sp->cam_path != NULL) && (sp->flags & ISC_FROZEN)) {
75 xpt_release_devq(sp->cam_path, 1, true);
76 }
77 #endif
78 sp->flags &= ~ISC_FROZEN;
79 }
80
81 void
ic_lost_target(isc_session_t * sp,int target)82 ic_lost_target(isc_session_t *sp, int target)
83 {
84 struct isc_softc *isp = sp->isc;
85
86 debug_called(8);
87 sdebug(2, "target=%d", target);
88 if(sp->cam_path != NULL) {
89 lockmgr(&isp->cam_lock, LK_EXCLUSIVE);
90 xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL);
91 xpt_free_path(sp->cam_path);
92 lockmgr(&isp->cam_lock, LK_RELEASE);
93 sp->cam_path = 0; // XXX
94 }
95 }
96
97 static void
_scan_callback(struct cam_periph * periph,union ccb * ccb)98 _scan_callback(struct cam_periph *periph, union ccb *ccb)
99 {
100 isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0;
101
102 debug_called(8);
103
104 xpt_free_ccb(&ccb->ccb_h);
105 if (sp->flags & ISC_FFPWAIT) {
106 sp->flags &= ~ISC_FFPWAIT;
107 wakeup(sp);
108 }
109 }
110
111 static void
_scan_target(isc_session_t * sp,int target)112 _scan_target(isc_session_t *sp, int target)
113 {
114 union ccb *ccb;
115
116 debug_called(8);
117 sdebug(2, "target=%d", target);
118
119 ccb = xpt_alloc_ccb();
120
121 CAM_LOCK(sp->isc);
122 xpt_setup_ccb(&ccb->ccb_h, sp->cam_path, 5/*priority (low)*/);
123 ccb->ccb_h.func_code = XPT_SCAN_BUS;
124 ccb->ccb_h.cbfcnp = _scan_callback;
125 ccb->crcn.flags = CAM_FLAG_NONE;
126 ccb->ccb_h.spriv_ptr0 = sp;
127
128 xpt_action(ccb);
129 CAM_UNLOCK(sp->isc);
130 }
131
132 int
ic_fullfeature(struct cdev * dev)133 ic_fullfeature(struct cdev *dev)
134 {
135 struct isc_softc *isp = dev->si_drv1;
136 isc_session_t *sp = (isc_session_t *)dev->si_drv2;
137
138 debug_called(8);
139 sdebug(3, "dev=%d sc=%p", minor(dev), isp);
140
141 sp->flags &= ~ISC_FFPHASE;
142 sp->flags |= ISC_FFPWAIT;
143
144 CAM_LOCK(isp);
145 if(xpt_create_path(&sp->cam_path, xpt_periph, cam_sim_path(sp->isc->cam_sim),
146 sp->sid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
147 xdebug("can't create cam path");
148 CAM_UNLOCK(isp);
149 return ENODEV; // XXX
150 }
151 CAM_UNLOCK(isp);
152
153 _scan_target(sp, sp->sid);
154
155 while(sp->flags & ISC_FFPWAIT)
156 tsleep(sp, 0, "ffp", 5*hz); // timeout should be configurable
157 if(sp->target_nluns > 0) {
158 sp->flags |= ISC_FFPHASE;
159 return 0;
160 }
161
162 return ENODEV;
163 }
164
165 static void
_inq(struct cam_sim * sim,union ccb * ccb,int maxluns)166 _inq(struct cam_sim *sim, union ccb *ccb, int maxluns)
167 {
168 struct ccb_pathinq *cpi = &ccb->cpi;
169
170 debug_called(4);
171
172 cpi->version_num = 1; /* XXX??? */
173 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32;
174 cpi->target_sprt = 0;
175 cpi->hba_misc = 0;
176 cpi->hba_eng_cnt = 0;
177 cpi->max_target = ISCSI_MAX_TARGETS - 1;
178 cpi->initiator_id = ISCSI_MAX_TARGETS;
179 cpi->max_lun = maxluns;
180 cpi->bus_id = cam_sim_bus(sim);
181 cpi->base_transfer_speed = 3300;
182 strncpy(cpi->sim_vid, "DragonFly", SIM_IDLEN);
183 strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN);
184 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
185 cpi->unit_number = cam_sim_unit(sim);
186 cpi->ccb_h.status = CAM_REQ_CMP;
187 }
188
189 static __inline int
_scsi_encap(struct cam_sim * sim,union ccb * ccb)190 _scsi_encap(struct cam_sim *sim, union ccb *ccb)
191 {
192 int ret;
193 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim);
194
195 lockmgr(&isp->cam_lock, LK_EXCLUSIVE);
196 ret = scsi_encap(sim, ccb);
197 lockmgr(&isp->cam_lock, LK_RELEASE);
198 return ret;
199 }
200
201 static void
ic_action(struct cam_sim * sim,union ccb * ccb)202 ic_action(struct cam_sim *sim, union ccb *ccb)
203 {
204 struct ccb_hdr *ccb_h = &ccb->ccb_h;
205 struct isc_softc *isp = (struct isc_softc *)cam_sim_softc(sim);
206 isc_session_t *sp;
207
208 debug_called(8);
209
210 if((ccb_h->target_id != CAM_TARGET_WILDCARD) && (ccb_h->target_id < MAX_SESSIONS))
211 sp = isp->sessions[ccb_h->target_id];
212 else
213 sp = NULL;
214
215 ccb_h->spriv_ptr0 = sp;
216
217 debug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%d retry_count=%d timeout=%d",
218 ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status,
219 ccb->ccb_h.target_id, ccb->ccb_h.target_lun,
220 ccb->ccb_h.retry_count, ccb_h->timeout);
221 /*
222 | first quick check
223 */
224 switch(ccb_h->func_code) {
225 default:
226 // XXX: maybe check something else?
227 break;
228
229 case XPT_SCSI_IO:
230 case XPT_RESET_DEV:
231 case XPT_GET_TRAN_SETTINGS:
232 case XPT_SET_TRAN_SETTINGS:
233 case XPT_CALC_GEOMETRY:
234 if(sp == NULL) {
235 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
236 xpt_done(ccb);
237 return;
238 }
239 break;
240
241 case XPT_PATH_INQ:
242 case XPT_NOOP:
243 if(sp == NULL && ccb->ccb_h.target_id != CAM_TARGET_WILDCARD) {
244 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
245 xpt_done(ccb);
246 debug(4, "status = CAM_DEV_NOT_THERE");
247 return;
248 }
249 }
250
251 switch(ccb_h->func_code) {
252
253 case XPT_PATH_INQ:
254 _inq(sim, ccb, (sp? sp->opt.maxluns: ISCSI_MAX_LUNS) - 1);
255 break;
256
257 case XPT_RESET_BUS: // (can just be a stub that does nothing and completes)
258 {
259 struct ccb_pathinq *cpi = &ccb->cpi;
260
261 debug(3, "XPT_RESET_BUS");
262 cpi->ccb_h.status = CAM_REQ_CMP;
263 break;
264 }
265
266 case XPT_SCSI_IO:
267 {
268 struct ccb_scsiio* csio = &ccb->csio;
269
270 debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]);
271 if(sp == NULL) {
272 ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS;
273 debug(4, "xpt_done.status=%d", ccb_h->status);
274 break;
275 }
276 if(ccb_h->target_lun == CAM_LUN_WILDCARD) {
277 debug(3, "target=%d: bad lun (-1)", ccb_h->target_id);
278 ccb_h->status = CAM_LUN_INVALID;
279 break;
280 }
281 if(_scsi_encap(sim, ccb) != 0)
282 return;
283 break;
284 }
285
286 case XPT_CALC_GEOMETRY:
287 {
288 struct ccb_calc_geometry *ccg;
289
290 ccg = &ccb->ccg;
291 debug(6, "XPT_CALC_GEOMETRY vsize=%jd bsize=%d", ccg->volume_size, ccg->block_size);
292 if(ccg->block_size == 0 ||
293 (ccg->volume_size < ccg->block_size)) {
294 // print error message ...
295 /* XXX: what error is appropiate? */
296 break;
297 } else
298 cam_calc_geometry(ccg, /*extended*/1);
299 break;
300 }
301
302 case XPT_GET_TRAN_SETTINGS:
303 default:
304 ccb_h->status = CAM_REQ_INVALID;
305 break;
306 }
307 xpt_done(ccb);
308 return;
309 }
310
311 static void
ic_poll(struct cam_sim * sim)312 ic_poll(struct cam_sim *sim)
313 {
314 debug_called(8);
315
316 }
317
318 int
ic_getCamVals(isc_session_t * sp,iscsi_cam_t * cp)319 ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp)
320 {
321 int i;
322
323 debug_called(8);
324
325 if(sp && sp->isc->cam_sim) {
326 cp->path_id = cam_sim_path(sp->isc->cam_sim);
327 cp->target_id = sp->sid;
328 cp->target_nluns = sp->target_nluns; // XXX: -1?
329 for(i = 0; i < cp->target_nluns; i++)
330 cp->target_lun[i] = sp->target_lun[i];
331 return 0;
332 }
333 return ENXIO;
334 }
335
336 void
ic_destroy(struct isc_softc * isp)337 ic_destroy(struct isc_softc *isp)
338 {
339 debug_called(8);
340
341 CAM_LOCK(isp); // can't harm :-)
342
343 xpt_async(AC_LOST_DEVICE, isp->cam_path, NULL);
344 xpt_free_path(isp->cam_path);
345 xpt_bus_deregister(cam_sim_path(isp->cam_sim));
346 cam_sim_free(isp->cam_sim);
347
348 CAM_UNLOCK(isp);
349 }
350
351 int
ic_init(struct isc_softc * isp)352 ic_init(struct isc_softc *isp)
353 {
354 struct cam_sim *sim;
355 struct cam_devq *devq;
356 struct cam_path *path;
357
358 if((devq = cam_simq_alloc(256)) == NULL)
359 return ENOMEM;
360
361 lockinit(&isp->cam_lock, "isc-cam", 0, LK_CANRECURSE);
362 sim = cam_sim_alloc(ic_action, ic_poll,
363 "iscsi", isp, 0, /* unit */
364 &sim_mplock,
365 1, /* max_dev_transactions */
366 100, /* max_tagged_dev_transactions */
367 devq);
368 cam_simq_release(devq);
369 if(sim == NULL) {
370 lockuninit(&isp->cam_lock);
371 return ENXIO;
372 }
373 CAM_LOCK(isp);
374 if(xpt_bus_register(sim,
375 0/*bus_number*/) != CAM_SUCCESS)
376 goto bad;
377
378 if(xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
379 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
380 xpt_bus_deregister(cam_sim_path(sim));
381 goto bad;
382 }
383
384 CAM_UNLOCK(isp);
385
386 isp->cam_sim = sim;
387 isp->cam_path = path;
388
389 debug(2, "cam subsystem initialized"); // XXX: add dev ...
390 debug(4, "sim=%p path=%p", sim, path);
391 return 0;
392
393 bad:
394 cam_sim_free(sim);
395 CAM_UNLOCK(isp);
396 return ENXIO;
397 }
398