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8322 nl: misleading-indentation
[unleashed/tickless.git] / usr / src / uts / common / xen / io / xnb.c
blob761597653b07e0c52a5389f87bac1e1c3682159a
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #ifdef DEBUG
28 #define XNB_DEBUG 1
29 #endif /* DEBUG */
30
31 #include "xnb.h"
32
33 #include <sys/sunddi.h>
34 #include <sys/sunndi.h>
35 #include <sys/modctl.h>
36 #include <sys/conf.h>
37 #include <sys/mac.h>
38 #include <sys/mac_impl.h> /* For mac_fix_cksum(). */
39 #include <sys/dlpi.h>
40 #include <sys/strsubr.h>
41 #include <sys/strsun.h>
42 #include <sys/types.h>
43 #include <sys/pattr.h>
44 #include <vm/seg_kmem.h>
45 #include <vm/hat_i86.h>
46 #include <xen/sys/xenbus_impl.h>
47 #include <xen/sys/xendev.h>
48 #include <sys/balloon_impl.h>
49 #include <sys/evtchn_impl.h>
50 #include <sys/gnttab.h>
51 #include <vm/vm_dep.h>
52 #include <sys/note.h>
53 #include <sys/gld.h>
54 #include <inet/ip.h>
55 #include <inet/ip_impl.h>
56
57 /*
58 * The terms "transmit" and "receive" are used in alignment with domU,
59 * which means that packets originating from the peer domU are "transmitted"
60 * to other parts of the system and packets are "received" from them.
61 */
62
63 /*
64 * Should we allow guests to manipulate multicast group membership?
65 */
66 static boolean_t xnb_multicast_control = B_TRUE;
67
68 static boolean_t xnb_connect_rings(dev_info_t *);
69 static void xnb_disconnect_rings(dev_info_t *);
70 static void xnb_oe_state_change(dev_info_t *, ddi_eventcookie_t,
71 void *, void *);
72 static void xnb_hp_state_change(dev_info_t *, ddi_eventcookie_t,
73 void *, void *);
74
75 static int xnb_txbuf_constructor(void *, void *, int);
76 static void xnb_txbuf_destructor(void *, void *);
77 static void xnb_tx_notify_peer(xnb_t *, boolean_t);
78 static void xnb_tx_mark_complete(xnb_t *, RING_IDX, int16_t);
79
80 mblk_t *xnb_to_peer(xnb_t *, mblk_t *);
81 mblk_t *xnb_copy_to_peer(xnb_t *, mblk_t *);
82
83 static void setup_gop(xnb_t *, gnttab_copy_t *, uchar_t *,
84 size_t, size_t, size_t, grant_ref_t);
85 #pragma inline(setup_gop)
86 static boolean_t is_foreign(void *);
87 #pragma inline(is_foreign)
88
89 #define INVALID_GRANT_HANDLE ((grant_handle_t)-1)
90 #define INVALID_GRANT_REF ((grant_ref_t)-1)
91
92 static kmutex_t xnb_alloc_page_lock;
93
94 /*
95 * On a 32 bit PAE system physical and machine addresses are larger
96 * than 32 bits. ddi_btop() on such systems take an unsigned long
97 * argument, and so addresses above 4G are truncated before ddi_btop()
98 * gets to see them. To avoid this, code the shift operation here.
99 */
100 #define xnb_btop(addr) ((addr) >> PAGESHIFT)
101
102 /* DMA attributes for transmit and receive data */
103 static ddi_dma_attr_t buf_dma_attr = {
104 DMA_ATTR_V0, /* version of this structure */
105 0, /* lowest usable address */
106 0xffffffffffffffffULL, /* highest usable address */
107 0x7fffffff, /* maximum DMAable byte count */
108 MMU_PAGESIZE, /* alignment in bytes */
109 0x7ff, /* bitmap of burst sizes */
110 1, /* minimum transfer */
111 0xffffffffU, /* maximum transfer */
112 0xffffffffffffffffULL, /* maximum segment length */
113 1, /* maximum number of segments */
114 1, /* granularity */
115 0, /* flags (reserved) */
116 };
117
118 /* DMA access attributes for data: NOT to be byte swapped. */
119 static ddi_device_acc_attr_t data_accattr = {
120 DDI_DEVICE_ATTR_V0,
121 DDI_NEVERSWAP_ACC,
122 DDI_STRICTORDER_ACC
123 };
124
125 /*
126 * Statistics.
127 */
128 static const char * const aux_statistics[] = {
129 "rx_cksum_deferred",
130 "tx_cksum_no_need",
131 "rx_rsp_notok",
132 "tx_notify_deferred",
133 "tx_notify_sent",
134 "rx_notify_deferred",
135 "rx_notify_sent",
136 "tx_too_early",
137 "rx_too_early",
138 "rx_allocb_failed",
139 "tx_allocb_failed",
140 "rx_foreign_page",
141 "mac_full",
142 "spurious_intr",
143 "allocation_success",
144 "allocation_failure",
145 "small_allocation_success",
146 "small_allocation_failure",
147 "other_allocation_failure",
148 "rx_pageboundary_crossed",
149 "rx_cpoparea_grown",
150 "csum_hardware",
151 "csum_software",
152 "tx_overflow_page",
153 "tx_unexpected_flags",
154 };
155
156 static int
157 xnb_ks_aux_update(kstat_t *ksp, int flag)
158 {
159 xnb_t *xnbp;
160 kstat_named_t *knp;
161
162 if (flag != KSTAT_READ)
163 return (EACCES);
164
165 xnbp = ksp->ks_private;
166 knp = ksp->ks_data;
167
168 /*
169 * Assignment order should match that of the names in
170 * aux_statistics.
171 */
172 (knp++)->value.ui64 = xnbp->xnb_stat_rx_cksum_deferred;
173 (knp++)->value.ui64 = xnbp->xnb_stat_tx_cksum_no_need;
174 (knp++)->value.ui64 = xnbp->xnb_stat_rx_rsp_notok;
175 (knp++)->value.ui64 = xnbp->xnb_stat_tx_notify_deferred;
176 (knp++)->value.ui64 = xnbp->xnb_stat_tx_notify_sent;
177 (knp++)->value.ui64 = xnbp->xnb_stat_rx_notify_deferred;
178 (knp++)->value.ui64 = xnbp->xnb_stat_rx_notify_sent;
179 (knp++)->value.ui64 = xnbp->xnb_stat_tx_too_early;
180 (knp++)->value.ui64 = xnbp->xnb_stat_rx_too_early;
181 (knp++)->value.ui64 = xnbp->xnb_stat_rx_allocb_failed;
182 (knp++)->value.ui64 = xnbp->xnb_stat_tx_allocb_failed;
183 (knp++)->value.ui64 = xnbp->xnb_stat_rx_foreign_page;
184 (knp++)->value.ui64 = xnbp->xnb_stat_mac_full;
185 (knp++)->value.ui64 = xnbp->xnb_stat_spurious_intr;
186 (knp++)->value.ui64 = xnbp->xnb_stat_allocation_success;
187 (knp++)->value.ui64 = xnbp->xnb_stat_allocation_failure;
188 (knp++)->value.ui64 = xnbp->xnb_stat_small_allocation_success;
189 (knp++)->value.ui64 = xnbp->xnb_stat_small_allocation_failure;
190 (knp++)->value.ui64 = xnbp->xnb_stat_other_allocation_failure;
191 (knp++)->value.ui64 = xnbp->xnb_stat_rx_pagebndry_crossed;
192 (knp++)->value.ui64 = xnbp->xnb_stat_rx_cpoparea_grown;
193 (knp++)->value.ui64 = xnbp->xnb_stat_csum_hardware;
194 (knp++)->value.ui64 = xnbp->xnb_stat_csum_software;
195 (knp++)->value.ui64 = xnbp->xnb_stat_tx_overflow_page;
196 (knp++)->value.ui64 = xnbp->xnb_stat_tx_unexpected_flags;
197
198 return (0);
199 }
200
201 static boolean_t
202 xnb_ks_init(xnb_t *xnbp)
203 {
204 int nstat = sizeof (aux_statistics) /
205 sizeof (aux_statistics[0]);
206 const char * const *cp = aux_statistics;
207 kstat_named_t *knp;
208
209 /*
210 * Create and initialise kstats.
211 */
212 xnbp->xnb_kstat_aux = kstat_create(ddi_driver_name(xnbp->xnb_devinfo),
213 ddi_get_instance(xnbp->xnb_devinfo), "aux_statistics", "net",
214 KSTAT_TYPE_NAMED, nstat, 0);
215 if (xnbp->xnb_kstat_aux == NULL)
216 return (B_FALSE);
217
218 xnbp->xnb_kstat_aux->ks_private = xnbp;
219 xnbp->xnb_kstat_aux->ks_update = xnb_ks_aux_update;
220
221 knp = xnbp->xnb_kstat_aux->ks_data;
222 while (nstat > 0) {
223 kstat_named_init(knp, *cp, KSTAT_DATA_UINT64);
224
225 knp++;
226 cp++;
227 nstat--;
228 }
229
230 kstat_install(xnbp->xnb_kstat_aux);
231
232 return (B_TRUE);
233 }
234
235 static void
236 xnb_ks_free(xnb_t *xnbp)
237 {
238 kstat_delete(xnbp->xnb_kstat_aux);
239 }
240
241 /*
242 * Calculate and insert the transport checksum for an arbitrary packet.
243 */
244 static mblk_t *
245 xnb_software_csum(xnb_t *xnbp, mblk_t *mp)
246 {
247 _NOTE(ARGUNUSED(xnbp));
248
249 /*
250 * XXPV dme: shouldn't rely on mac_fix_cksum(), not least
251 * because it doesn't cover all of the interesting cases :-(
252 */
253 mac_hcksum_set(mp, 0, 0, 0, 0, HCK_FULLCKSUM);
254
255 return (mac_fix_cksum(mp));
256 }
257
258 mblk_t *
259 xnb_process_cksum_flags(xnb_t *xnbp, mblk_t *mp, uint32_t capab)
260 {
261 struct ether_header *ehp;
262 uint16_t sap;
263 uint32_t offset;
264 ipha_t *ipha;
265
266 ASSERT(mp->b_next == NULL);
267
268 /*
269 * Check that the packet is contained in a single mblk. In
270 * the "from peer" path this is true today, but may change
271 * when scatter gather support is added. In the "to peer"
272 * path we cannot be sure, but in most cases it will be true
273 * (in the xnbo case the packet has come from a MAC device
274 * which is unlikely to split packets).
275 */
276 if (mp->b_cont != NULL)
277 goto software;
278
279 /*
280 * If the MAC has no hardware capability don't do any further
281 * checking.
282 */
283 if (capab == 0)
284 goto software;
285
286 ASSERT(MBLKL(mp) >= sizeof (struct ether_header));
287 ehp = (struct ether_header *)mp->b_rptr;
288
289 if (ntohs(ehp->ether_type) == VLAN_TPID) {
290 struct ether_vlan_header *evhp;
291
292 ASSERT(MBLKL(mp) >= sizeof (struct ether_vlan_header));
293 evhp = (struct ether_vlan_header *)mp->b_rptr;
294 sap = ntohs(evhp->ether_type);
295 offset = sizeof (struct ether_vlan_header);
296 } else {
297 sap = ntohs(ehp->ether_type);
298 offset = sizeof (struct ether_header);
299 }
300
301 /*
302 * We only attempt to do IPv4 packets in hardware.
303 */
304 if (sap != ETHERTYPE_IP)
305 goto software;
306
307 /*
308 * We know that this is an IPv4 packet.
309 */
310 ipha = (ipha_t *)(mp->b_rptr + offset);
311
312 switch (ipha->ipha_protocol) {
313 case IPPROTO_TCP:
314 case IPPROTO_UDP: {
315 uint32_t start, length, stuff, cksum;
316 uint16_t *stuffp;
317
318 /*
319 * This is a TCP/IPv4 or UDP/IPv4 packet, for which we
320 * can use full IPv4 and partial checksum offload.
321 */
322 if ((capab & (HCKSUM_INET_FULL_V4|HCKSUM_INET_PARTIAL)) == 0)
323 break;
324
325 start = IP_SIMPLE_HDR_LENGTH;
326 length = ntohs(ipha->ipha_length);
327 if (ipha->ipha_protocol == IPPROTO_TCP) {
328 stuff = start + TCP_CHECKSUM_OFFSET;
329 cksum = IP_TCP_CSUM_COMP;
330 } else {
331 stuff = start + UDP_CHECKSUM_OFFSET;
332 cksum = IP_UDP_CSUM_COMP;
333 }
334 stuffp = (uint16_t *)(mp->b_rptr + offset + stuff);
335
336 if (capab & HCKSUM_INET_FULL_V4) {
337 /*
338 * Some devices require that the checksum
339 * field of the packet is zero for full
340 * offload.
341 */
342 *stuffp = 0;
343
344 mac_hcksum_set(mp, 0, 0, 0, 0, HCK_FULLCKSUM);
345
346 xnbp->xnb_stat_csum_hardware++;
347
348 return (mp);
349 }
350
351 if (capab & HCKSUM_INET_PARTIAL) {
352 if (*stuffp == 0) {
353 ipaddr_t src, dst;
354
355 /*
356 * Older Solaris guests don't insert
357 * the pseudo-header checksum, so we
358 * calculate it here.
359 */
360 src = ipha->ipha_src;
361 dst = ipha->ipha_dst;
362
363 cksum += (dst >> 16) + (dst & 0xFFFF);
364 cksum += (src >> 16) + (src & 0xFFFF);
365 cksum += length - IP_SIMPLE_HDR_LENGTH;
366
367 cksum = (cksum >> 16) + (cksum & 0xFFFF);
368 cksum = (cksum >> 16) + (cksum & 0xFFFF);
369
370 ASSERT(cksum <= 0xFFFF);
371
372 *stuffp = (uint16_t)(cksum ? cksum : ~cksum);
373 }
374
375 mac_hcksum_set(mp, start, stuff, length, 0,
376 HCK_PARTIALCKSUM);
377
378 xnbp->xnb_stat_csum_hardware++;
379
380 return (mp);
381 }
382
383 /* NOTREACHED */
384 break;
385 }
386
387 default:
388 /* Use software. */
389 break;
390 }
391
392 software:
393 /*
394 * We are not able to use any offload so do the whole thing in
395 * software.
396 */
397 xnbp->xnb_stat_csum_software++;
398
399 return (xnb_software_csum(xnbp, mp));
400 }
401
402 int
403 xnb_attach(dev_info_t *dip, xnb_flavour_t *flavour, void *flavour_data)
404 {
405 xnb_t *xnbp;
406 char *xsname;
407 char cachename[32];
408
409 xnbp = kmem_zalloc(sizeof (*xnbp), KM_SLEEP);
410
411 xnbp->xnb_flavour = flavour;
412 xnbp->xnb_flavour_data = flavour_data;
413 xnbp->xnb_devinfo = dip;
414 xnbp->xnb_evtchn = INVALID_EVTCHN;
415 xnbp->xnb_irq = B_FALSE;
416 xnbp->xnb_tx_ring_handle = INVALID_GRANT_HANDLE;
417 xnbp->xnb_rx_ring_handle = INVALID_GRANT_HANDLE;
418 xnbp->xnb_connected = B_FALSE;
419 xnbp->xnb_hotplugged = B_FALSE;
420 xnbp->xnb_detachable = B_FALSE;
421 xnbp->xnb_peer = xvdi_get_oeid(dip);
422 xnbp->xnb_be_status = XNB_STATE_INIT;
423 xnbp->xnb_fe_status = XNB_STATE_INIT;
424
425 xnbp->xnb_tx_buf_count = 0;
426
427 xnbp->xnb_rx_hv_copy = B_FALSE;
428 xnbp->xnb_multicast_control = B_FALSE;
429
430 xnbp->xnb_rx_va = vmem_alloc(heap_arena, PAGESIZE, VM_SLEEP);
431 ASSERT(xnbp->xnb_rx_va != NULL);
432
433 if (ddi_get_iblock_cookie(dip, 0, &xnbp->xnb_icookie)
434 != DDI_SUCCESS)
435 goto failure;
436
437 /* Allocated on demand, when/if we enter xnb_copy_to_peer(). */
438 xnbp->xnb_rx_cpop = NULL;
439 xnbp->xnb_rx_cpop_count = 0;
440
441 mutex_init(&xnbp->xnb_tx_lock, NULL, MUTEX_DRIVER,
442 xnbp->xnb_icookie);
443 mutex_init(&xnbp->xnb_rx_lock, NULL, MUTEX_DRIVER,
444 xnbp->xnb_icookie);
445 mutex_init(&xnbp->xnb_state_lock, NULL, MUTEX_DRIVER,
446 xnbp->xnb_icookie);
447
448 /* Set driver private pointer now. */
449 ddi_set_driver_private(dip, xnbp);
450
451 (void) sprintf(cachename, "xnb_tx_buf_cache_%d", ddi_get_instance(dip));
452 xnbp->xnb_tx_buf_cache = kmem_cache_create(cachename,
453 sizeof (xnb_txbuf_t), 0,
454 xnb_txbuf_constructor, xnb_txbuf_destructor,
455 NULL, xnbp, NULL, 0);
456 if (xnbp->xnb_tx_buf_cache == NULL)
457 goto failure_0;
458
459 if (!xnb_ks_init(xnbp))
460 goto failure_1;
461
462 /*
463 * Receive notification of changes in the state of the
464 * driver in the guest domain.
465 */
466 if (xvdi_add_event_handler(dip, XS_OE_STATE, xnb_oe_state_change,
467 NULL) != DDI_SUCCESS)
468 goto failure_2;
469
470 /*
471 * Receive notification of hotplug events.
472 */
473 if (xvdi_add_event_handler(dip, XS_HP_STATE, xnb_hp_state_change,
474 NULL) != DDI_SUCCESS)
475 goto failure_2;
476
477 xsname = xvdi_get_xsname(dip);
478
479 if (xenbus_printf(XBT_NULL, xsname,
480 "feature-multicast-control", "%d",
481 xnb_multicast_control ? 1 : 0) != 0)
482 goto failure_3;
483
484 if (xenbus_printf(XBT_NULL, xsname,
485 "feature-rx-copy", "%d", 1) != 0)
486 goto failure_3;
487 /*
488 * Linux domUs seem to depend on "feature-rx-flip" being 0
489 * in addition to "feature-rx-copy" being 1. It seems strange
490 * to use four possible states to describe a binary decision,
491 * but we might as well play nice.
492 */
493 if (xenbus_printf(XBT_NULL, xsname,
494 "feature-rx-flip", "%d", 0) != 0)
495 goto failure_3;
496
497 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateInitWait);
498 (void) xvdi_post_event(dip, XEN_HP_ADD);
499
500 return (DDI_SUCCESS);
501
502 failure_3:
503 xvdi_remove_event_handler(dip, NULL);
504
505 failure_2:
506 xnb_ks_free(xnbp);
507
508 failure_1:
509 kmem_cache_destroy(xnbp->xnb_tx_buf_cache);
510
511 failure_0:
512 mutex_destroy(&xnbp->xnb_state_lock);
513 mutex_destroy(&xnbp->xnb_rx_lock);
514 mutex_destroy(&xnbp->xnb_tx_lock);
515
516 failure:
517 vmem_free(heap_arena, xnbp->xnb_rx_va, PAGESIZE);
518 kmem_free(xnbp, sizeof (*xnbp));
519 return (DDI_FAILURE);
520 }
521
522 void
523 xnb_detach(dev_info_t *dip)
524 {
525 xnb_t *xnbp = ddi_get_driver_private(dip);
526
527 ASSERT(xnbp != NULL);
528 ASSERT(!xnbp->xnb_connected);
529 ASSERT(xnbp->xnb_tx_buf_count == 0);
530
531 xnb_disconnect_rings(dip);
532
533 xvdi_remove_event_handler(dip, NULL);
534
535 xnb_ks_free(xnbp);
536
537 kmem_cache_destroy(xnbp->xnb_tx_buf_cache);
538
539 ddi_set_driver_private(dip, NULL);
540
541 mutex_destroy(&xnbp->xnb_state_lock);
542 mutex_destroy(&xnbp->xnb_rx_lock);
543 mutex_destroy(&xnbp->xnb_tx_lock);
544
545 if (xnbp->xnb_rx_cpop_count > 0)
546 kmem_free(xnbp->xnb_rx_cpop, sizeof (xnbp->xnb_rx_cpop[0])
547 * xnbp->xnb_rx_cpop_count);
548
549 ASSERT(xnbp->xnb_rx_va != NULL);
550 vmem_free(heap_arena, xnbp->xnb_rx_va, PAGESIZE);
551
552 kmem_free(xnbp, sizeof (*xnbp));
553 }
554
555 /*
556 * Allocate a page from the hypervisor to be flipped to the peer.
557 *
558 * Try to get pages in batches to reduce the overhead of calls into
559 * the balloon driver.
560 */
561 static mfn_t
562 xnb_alloc_page(xnb_t *xnbp)
563 {
564 #define WARNING_RATE_LIMIT 100
565 #define BATCH_SIZE 256
566 static mfn_t mfns[BATCH_SIZE]; /* common across all instances */
567 static int nth = BATCH_SIZE;
568 mfn_t mfn;
569
570 mutex_enter(&xnb_alloc_page_lock);
571 if (nth == BATCH_SIZE) {
572 if (balloon_alloc_pages(BATCH_SIZE, mfns) != BATCH_SIZE) {
573 xnbp->xnb_stat_allocation_failure++;
574 mutex_exit(&xnb_alloc_page_lock);
575
576 /*
577 * Try for a single page in low memory situations.
578 */
579 if (balloon_alloc_pages(1, &mfn) != 1) {
580 if ((xnbp->xnb_stat_small_allocation_failure++
581 % WARNING_RATE_LIMIT) == 0)
582 cmn_err(CE_WARN, "xnb_alloc_page: "
583 "Cannot allocate memory to "
584 "transfer packets to peer.");
585 return (0);
586 } else {
587 xnbp->xnb_stat_small_allocation_success++;
588 return (mfn);
589 }
590 }
591
592 nth = 0;
593 xnbp->xnb_stat_allocation_success++;
594 }
595
596 mfn = mfns[nth++];
597 mutex_exit(&xnb_alloc_page_lock);
598
599 ASSERT(mfn != 0);
600
601 return (mfn);
602 #undef BATCH_SIZE
603 #undef WARNING_RATE_LIMIT
604 }
605
606 /*
607 * Free a page back to the hypervisor.
608 *
609 * This happens only in the error path, so batching is not worth the
610 * complication.
611 */
612 static void
613 xnb_free_page(xnb_t *xnbp, mfn_t mfn)
614 {
615 _NOTE(ARGUNUSED(xnbp));
616 int r;
617 pfn_t pfn;
618
619 pfn = xen_assign_pfn(mfn);
620 pfnzero(pfn, 0, PAGESIZE);
621 xen_release_pfn(pfn);
622
623 if ((r = balloon_free_pages(1, &mfn, NULL, NULL)) != 1) {
624 cmn_err(CE_WARN, "free_page: cannot decrease memory "
625 "reservation (%d): page kept but unusable (mfn = 0x%lx).",
626 r, mfn);
627 }
628 }
629
630 /*
631 * Similar to RING_HAS_UNCONSUMED_REQUESTS(&xnbp->rx_ring) but using
632 * local variables. Used in both xnb_to_peer() and xnb_copy_to_peer().
633 */
634 #define XNB_RING_HAS_UNCONSUMED_REQUESTS(_r) \
635 ((((_r)->sring->req_prod - loop) < \
636 (RING_SIZE(_r) - (loop - prod))) ? \
637 ((_r)->sring->req_prod - loop) : \
638 (RING_SIZE(_r) - (loop - prod)))
639
640 /*
641 * Pass packets to the peer using page flipping.
642 */
643 mblk_t *
644 xnb_to_peer(xnb_t *xnbp, mblk_t *mp)
645 {
646 mblk_t *free = mp, *prev = NULL;
647 size_t len;
648 gnttab_transfer_t *gop;
649 boolean_t notify;
650 RING_IDX loop, prod, end;
651
652 /*
653 * For each packet the sequence of operations is:
654 *
655 * 1. get a new page from the hypervisor.
656 * 2. get a request slot from the ring.
657 * 3. copy the data into the new page.
658 * 4. transfer the page to the peer.
659 * 5. update the request slot.
660 * 6. kick the peer.
661 * 7. free mp.
662 *
663 * In order to reduce the number of hypercalls, we prepare
664 * several packets for the peer and perform a single hypercall
665 * to transfer them.
666 */
667
668 mutex_enter(&xnbp->xnb_rx_lock);
669
670 /*
671 * If we are not connected to the peer or have not yet
672 * finished hotplug it is too early to pass packets to the
673 * peer.
674 */
675 if (!(xnbp->xnb_connected && xnbp->xnb_hotplugged)) {
676 mutex_exit(&xnbp->xnb_rx_lock);
677 DTRACE_PROBE(flip_rx_too_early);
678 xnbp->xnb_stat_rx_too_early++;
679 return (mp);
680 }
681
682 loop = xnbp->xnb_rx_ring.req_cons;
683 prod = xnbp->xnb_rx_ring.rsp_prod_pvt;
684 gop = xnbp->xnb_rx_top;
685
686 while ((mp != NULL) &&
687 XNB_RING_HAS_UNCONSUMED_REQUESTS(&xnbp->xnb_rx_ring)) {
688
689 mfn_t mfn;
690 pfn_t pfn;
691 netif_rx_request_t *rxreq;
692 netif_rx_response_t *rxresp;
693 char *valoop;
694 mblk_t *ml;
695 uint16_t cksum_flags;
696
697 /* 1 */
698 if ((mfn = xnb_alloc_page(xnbp)) == 0) {
699 xnbp->xnb_stat_rx_defer++;
700 break;
701 }
702
703 /* 2 */
704 rxreq = RING_GET_REQUEST(&xnbp->xnb_rx_ring, loop);
705
706 #ifdef XNB_DEBUG
707 if (!(rxreq->id < NET_RX_RING_SIZE))
708 cmn_err(CE_PANIC, "xnb_to_peer: "
709 "id %d out of range in request 0x%p",
710 rxreq->id, (void *)rxreq);
711 #endif /* XNB_DEBUG */
712
713 /* Assign a pfn and map the new page at the allocated va. */
714 pfn = xen_assign_pfn(mfn);
715 hat_devload(kas.a_hat, xnbp->xnb_rx_va, PAGESIZE,
716 pfn, PROT_READ | PROT_WRITE, HAT_LOAD);
717
718 /* 3 */
719 len = 0;
720 valoop = xnbp->xnb_rx_va;
721 for (ml = mp; ml != NULL; ml = ml->b_cont) {
722 size_t chunk = ml->b_wptr - ml->b_rptr;
723
724 bcopy(ml->b_rptr, valoop, chunk);
725 valoop += chunk;
726 len += chunk;
727 }
728
729 ASSERT(len < PAGESIZE);
730
731 /* Release the pfn. */
732 hat_unload(kas.a_hat, xnbp->xnb_rx_va, PAGESIZE,
733 HAT_UNLOAD_UNMAP);
734 xen_release_pfn(pfn);
735
736 /* 4 */
737 gop->mfn = mfn;
738 gop->domid = xnbp->xnb_peer;
739 gop->ref = rxreq->gref;
740
741 /* 5.1 */
742 rxresp = RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod);
743 rxresp->offset = 0;
744 rxresp->flags = 0;
745
746 cksum_flags = xnbp->xnb_flavour->xf_cksum_to_peer(xnbp, mp);
747 if (cksum_flags != 0)
748 xnbp->xnb_stat_rx_cksum_deferred++;
749 rxresp->flags |= cksum_flags;
750
751 rxresp->id = RING_GET_REQUEST(&xnbp->xnb_rx_ring, prod)->id;
752 rxresp->status = len;
753
754 loop++;
755 prod++;
756 gop++;
757 prev = mp;
758 mp = mp->b_next;
759 }
760
761 /*
762 * Did we actually do anything?
763 */
764 if (loop == xnbp->xnb_rx_ring.req_cons) {
765 mutex_exit(&xnbp->xnb_rx_lock);
766 return (mp);
767 }
768
769 end = loop;
770
771 /*
772 * Unlink the end of the 'done' list from the remainder.
773 */
774 ASSERT(prev != NULL);
775 prev->b_next = NULL;
776
777 if (HYPERVISOR_grant_table_op(GNTTABOP_transfer, xnbp->xnb_rx_top,
778 loop - xnbp->xnb_rx_ring.req_cons) != 0) {
779 cmn_err(CE_WARN, "xnb_to_peer: transfer operation failed");
780 }
781
782 loop = xnbp->xnb_rx_ring.req_cons;
783 prod = xnbp->xnb_rx_ring.rsp_prod_pvt;
784 gop = xnbp->xnb_rx_top;
785
786 while (loop < end) {
787 int16_t status = NETIF_RSP_OKAY;
788
789 if (gop->status != 0) {
790 status = NETIF_RSP_ERROR;
791
792 /*
793 * If the status is anything other than
794 * GNTST_bad_page then we don't own the page
795 * any more, so don't try to give it back.
796 */
797 if (gop->status != GNTST_bad_page)
798 gop->mfn = 0;
799 } else {
800 /* The page is no longer ours. */
801 gop->mfn = 0;
802 }
803
804 if (gop->mfn != 0)
805 /*
806 * Give back the page, as we won't be using
807 * it.
808 */
809 xnb_free_page(xnbp, gop->mfn);
810 else
811 /*
812 * We gave away a page, update our accounting
813 * now.
814 */
815 balloon_drv_subtracted(1);
816
817 /* 5.2 */
818 if (status != NETIF_RSP_OKAY) {
819 RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod)->status =
820 status;
821 } else {
822 xnbp->xnb_stat_ipackets++;
823 xnbp->xnb_stat_rbytes += len;
824 }
825
826 loop++;
827 prod++;
828 gop++;
829 }
830
831 xnbp->xnb_rx_ring.req_cons = loop;
832 xnbp->xnb_rx_ring.rsp_prod_pvt = prod;
833
834 /* 6 */
835 /* LINTED: constant in conditional context */
836 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xnbp->xnb_rx_ring, notify);
837 if (notify) {
838 ec_notify_via_evtchn(xnbp->xnb_evtchn);
839 xnbp->xnb_stat_rx_notify_sent++;
840 } else {
841 xnbp->xnb_stat_rx_notify_deferred++;
842 }
843
844 if (mp != NULL)
845 xnbp->xnb_stat_rx_defer++;
846
847 mutex_exit(&xnbp->xnb_rx_lock);
848
849 /* Free mblk_t's that we consumed. */
850 freemsgchain(free);
851
852 return (mp);
853 }
854
855 /* Helper functions for xnb_copy_to_peer(). */
856
857 /*
858 * Grow the array of copy operation descriptors.
859 */
860 static boolean_t
861 grow_cpop_area(xnb_t *xnbp)
862 {
863 size_t count;
864 gnttab_copy_t *new;
865
866 ASSERT(MUTEX_HELD(&xnbp->xnb_rx_lock));
867
868 count = xnbp->xnb_rx_cpop_count + CPOP_DEFCNT;
869
870 if ((new = kmem_alloc(sizeof (new[0]) * count, KM_NOSLEEP)) == NULL) {
871 xnbp->xnb_stat_other_allocation_failure++;
872 return (B_FALSE);
873 }
874
875 bcopy(xnbp->xnb_rx_cpop, new,
876 sizeof (xnbp->xnb_rx_cpop[0]) * xnbp->xnb_rx_cpop_count);
877
878 kmem_free(xnbp->xnb_rx_cpop,
879 sizeof (xnbp->xnb_rx_cpop[0]) * xnbp->xnb_rx_cpop_count);
880
881 xnbp->xnb_rx_cpop = new;
882 xnbp->xnb_rx_cpop_count = count;
883
884 xnbp->xnb_stat_rx_cpoparea_grown++;
885
886 return (B_TRUE);
887 }
888
889 /*
890 * Check whether an address is on a page that's foreign to this domain.
891 */
892 static boolean_t
893 is_foreign(void *addr)
894 {
895 pfn_t pfn = hat_getpfnum(kas.a_hat, addr);
896
897 return ((pfn & PFN_IS_FOREIGN_MFN) == PFN_IS_FOREIGN_MFN);
898 }
899
900 /*
901 * Insert a newly allocated mblk into a chain, replacing the old one.
902 */
903 static mblk_t *
904 replace_msg(mblk_t *mp, size_t len, mblk_t *mp_prev, mblk_t *ml_prev)
905 {
906 uint32_t start, stuff, end, value, flags;
907 mblk_t *new_mp;
908
909 new_mp = copyb(mp);
910 if (new_mp == NULL) {
911 cmn_err(CE_PANIC, "replace_msg: cannot alloc new message"
912 "for %p, len %lu", (void *) mp, len);
913 }
914
915 mac_hcksum_get(mp, &start, &stuff, &end, &value, &flags);
916 mac_hcksum_set(new_mp, start, stuff, end, value, flags);
917
918 new_mp->b_next = mp->b_next;
919 new_mp->b_prev = mp->b_prev;
920 new_mp->b_cont = mp->b_cont;
921
922 /* Make sure we only overwrite pointers to the mblk being replaced. */
923 if (mp_prev != NULL && mp_prev->b_next == mp)
924 mp_prev->b_next = new_mp;
925
926 if (ml_prev != NULL && ml_prev->b_cont == mp)
927 ml_prev->b_cont = new_mp;
928
929 mp->b_next = mp->b_prev = mp->b_cont = NULL;
930 freemsg(mp);
931
932 return (new_mp);
933 }
934
935 /*
936 * Set all the fields in a gnttab_copy_t.
937 */
938 static void
939 setup_gop(xnb_t *xnbp, gnttab_copy_t *gp, uchar_t *rptr,
940 size_t s_off, size_t d_off, size_t len, grant_ref_t d_ref)
941 {
942 ASSERT(xnbp != NULL && gp != NULL);
943
944 gp->source.offset = s_off;
945 gp->source.u.gmfn = pfn_to_mfn(hat_getpfnum(kas.a_hat, (caddr_t)rptr));
946 gp->source.domid = DOMID_SELF;
947
948 gp->len = (uint16_t)len;
949 gp->flags = GNTCOPY_dest_gref;
950 gp->status = 0;
951
952 gp->dest.u.ref = d_ref;
953 gp->dest.offset = d_off;
954 gp->dest.domid = xnbp->xnb_peer;
955 }
956
957 /*
958 * Pass packets to the peer using hypervisor copy operations.
959 */
960 mblk_t *
961 xnb_copy_to_peer(xnb_t *xnbp, mblk_t *mp)
962 {
963 mblk_t *free = mp, *mp_prev = NULL, *saved_mp = mp;
964 mblk_t *ml, *ml_prev;
965 boolean_t notify;
966 RING_IDX loop, prod;
967 int i;
968
969 /*
970 * If the peer does not pre-post buffers for received packets,
971 * use page flipping to pass packets to it.
972 */
973 if (!xnbp->xnb_rx_hv_copy)
974 return (xnb_to_peer(xnbp, mp));
975
976 /*
977 * For each packet the sequence of operations is:
978 *
979 * 1. get a request slot from the ring.
980 * 2. set up data for hypercall (see NOTE below)
981 * 3. have the hypervisore copy the data
982 * 4. update the request slot.
983 * 5. kick the peer.
984 *
985 * NOTE ad 2.
986 * In order to reduce the number of hypercalls, we prepare
987 * several mblks (mp->b_cont != NULL) for the peer and
988 * perform a single hypercall to transfer them. We also have
989 * to set up a seperate copy operation for every page.
990 *
991 * If we have more than one packet (mp->b_next != NULL), we do
992 * this whole dance repeatedly.
993 */
994
995 mutex_enter(&xnbp->xnb_rx_lock);
996
997 if (!(xnbp->xnb_connected && xnbp->xnb_hotplugged)) {
998 mutex_exit(&xnbp->xnb_rx_lock);
999 DTRACE_PROBE(copy_rx_too_early);
1000 xnbp->xnb_stat_rx_too_early++;
1001 return (mp);
1002 }
1003
1004 loop = xnbp->xnb_rx_ring.req_cons;
1005 prod = xnbp->xnb_rx_ring.rsp_prod_pvt;
1006
1007 while ((mp != NULL) &&
1008 XNB_RING_HAS_UNCONSUMED_REQUESTS(&xnbp->xnb_rx_ring)) {
1009 netif_rx_request_t *rxreq;
1010 size_t d_offset, len;
1011 int item_count;
1012 gnttab_copy_t *gop_cp;
1013 netif_rx_response_t *rxresp;
1014 uint16_t cksum_flags;
1015 int16_t status = NETIF_RSP_OKAY;
1016
1017 /* 1 */
1018 rxreq = RING_GET_REQUEST(&xnbp->xnb_rx_ring, loop);
1019
1020 #ifdef XNB_DEBUG
1021 if (!(rxreq->id < NET_RX_RING_SIZE))
1022 cmn_err(CE_PANIC, "xnb_copy_to_peer: "
1023 "id %d out of range in request 0x%p",
1024 rxreq->id, (void *)rxreq);
1025 #endif /* XNB_DEBUG */
1026
1027 /* 2 */
1028 d_offset = 0;
1029 len = 0;
1030 item_count = 0;
1031
1032 gop_cp = xnbp->xnb_rx_cpop;
1033
1034 /*
1035 * We walk the b_cont pointers and set up a
1036 * gnttab_copy_t for each sub-page chunk in each data
1037 * block.
1038 */
1039 /* 2a */
1040 for (ml = mp, ml_prev = NULL; ml != NULL; ml = ml->b_cont) {
1041 size_t chunk = ml->b_wptr - ml->b_rptr;
1042 uchar_t *r_tmp, *rpt_align;
1043 size_t r_offset;
1044
1045 /*
1046 * The hypervisor will not allow us to
1047 * reference a foreign page (e.g. one
1048 * belonging to another domain) by mfn in the
1049 * copy operation. If the data in this mblk is
1050 * on such a page we must copy the data into a
1051 * local page before initiating the hypervisor
1052 * copy operation.
1053 */
1054 if (is_foreign(ml->b_rptr) || is_foreign(ml->b_wptr)) {
1055 mblk_t *ml_new = replace_msg(ml, chunk,
1056 mp_prev, ml_prev);
1057
1058 /* We can still use old ml, but not *ml! */
1059 if (free == ml)
1060 free = ml_new;
1061 if (mp == ml)
1062 mp = ml_new;
1063 ml = ml_new;
1064
1065 xnbp->xnb_stat_rx_foreign_page++;
1066 }
1067
1068 rpt_align = (uchar_t *)ALIGN2PAGE(ml->b_rptr);
1069 r_offset = (uint16_t)(ml->b_rptr - rpt_align);
1070 r_tmp = ml->b_rptr;
1071
1072 if (d_offset + chunk > PAGESIZE)
1073 cmn_err(CE_PANIC, "xnb_copy_to_peer: mp %p "
1074 "(svd: %p), ml %p,rpt_alg. %p, d_offset "
1075 "(%lu) + chunk (%lu) > PAGESIZE %d!",
1076 (void *)mp, (void *)saved_mp, (void *)ml,
1077 (void *)rpt_align,
1078 d_offset, chunk, (int)PAGESIZE);
1079
1080 while (chunk > 0) {
1081 size_t part_len;
1082
1083 if (item_count == xnbp->xnb_rx_cpop_count) {
1084 if (!grow_cpop_area(xnbp))
1085 goto failure;
1086 gop_cp = &xnbp->xnb_rx_cpop[item_count];
1087 }
1088 /*
1089 * If our mblk crosses a page boundary, we need
1090 * to do a seperate copy for each page.
1091 */
1092 if (r_offset + chunk > PAGESIZE) {
1093 part_len = PAGESIZE - r_offset;
1094
1095 DTRACE_PROBE3(mblk_page_crossed,
1096 (mblk_t *), ml, int, chunk, int,
1097 (int)r_offset);
1098
1099 xnbp->xnb_stat_rx_pagebndry_crossed++;
1100 } else {
1101 part_len = chunk;
1102 }
1103
1104 setup_gop(xnbp, gop_cp, r_tmp, r_offset,
1105 d_offset, part_len, rxreq->gref);
1106
1107 chunk -= part_len;
1108
1109 len += part_len;
1110 d_offset += part_len;
1111 r_tmp += part_len;
1112 /*
1113 * The 2nd, 3rd ... last copies will always
1114 * start at r_tmp, therefore r_offset is 0.
1115 */
1116 r_offset = 0;
1117 gop_cp++;
1118 item_count++;
1119 }
1120 ml_prev = ml;
1121
1122 DTRACE_PROBE4(mblk_loop_end, (mblk_t *), ml, int,
1123 chunk, int, len, int, item_count);
1124 }
1125 /* 3 */
1126 if (HYPERVISOR_grant_table_op(GNTTABOP_copy, xnbp->xnb_rx_cpop,
1127 item_count) != 0) {
1128 cmn_err(CE_WARN, "xnb_copy_to_peer: copy op. failed");
1129 DTRACE_PROBE(HV_granttableopfailed);
1130 }
1131
1132 /* 4 */
1133 rxresp = RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod);
1134 rxresp->offset = 0;
1135
1136 rxresp->flags = 0;
1137
1138 DTRACE_PROBE4(got_RX_rsp, int, (int)rxresp->id, int,
1139 (int)rxresp->offset, int, (int)rxresp->flags, int,
1140 (int)rxresp->status);
1141
1142 cksum_flags = xnbp->xnb_flavour->xf_cksum_to_peer(xnbp, mp);
1143 if (cksum_flags != 0)
1144 xnbp->xnb_stat_rx_cksum_deferred++;
1145 rxresp->flags |= cksum_flags;
1146
1147 rxresp->id = RING_GET_REQUEST(&xnbp->xnb_rx_ring, prod)->id;
1148 rxresp->status = len;
1149
1150 DTRACE_PROBE4(RX_rsp_set, int, (int)rxresp->id, int,
1151 (int)rxresp->offset, int, (int)rxresp->flags, int,
1152 (int)rxresp->status);
1153
1154 for (i = 0; i < item_count; i++) {
1155 if (xnbp->xnb_rx_cpop[i].status != 0) {
1156 DTRACE_PROBE2(cpop_status_nonnull, int,
1157 (int)xnbp->xnb_rx_cpop[i].status,
1158 int, i);
1159 status = NETIF_RSP_ERROR;
1160 }
1161 }
1162
1163 /* 5.2 */
1164 if (status != NETIF_RSP_OKAY) {
1165 RING_GET_RESPONSE(&xnbp->xnb_rx_ring, prod)->status =
1166 status;
1167 xnbp->xnb_stat_rx_rsp_notok++;
1168 } else {
1169 xnbp->xnb_stat_ipackets++;
1170 xnbp->xnb_stat_rbytes += len;
1171 }
1172
1173 loop++;
1174 prod++;
1175 mp_prev = mp;
1176 mp = mp->b_next;
1177 }
1178 failure:
1179 /*
1180 * Did we actually do anything?
1181 */
1182 if (loop == xnbp->xnb_rx_ring.req_cons) {
1183 mutex_exit(&xnbp->xnb_rx_lock);
1184 return (mp);
1185 }
1186
1187 /*
1188 * Unlink the end of the 'done' list from the remainder.
1189 */
1190 ASSERT(mp_prev != NULL);
1191 mp_prev->b_next = NULL;
1192
1193 xnbp->xnb_rx_ring.req_cons = loop;
1194 xnbp->xnb_rx_ring.rsp_prod_pvt = prod;
1195
1196 /* 6 */
1197 /* LINTED: constant in conditional context */
1198 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xnbp->xnb_rx_ring, notify);
1199 if (notify) {
1200 ec_notify_via_evtchn(xnbp->xnb_evtchn);
1201 xnbp->xnb_stat_rx_notify_sent++;
1202 } else {
1203 xnbp->xnb_stat_rx_notify_deferred++;
1204 }
1205
1206 if (mp != NULL)
1207 xnbp->xnb_stat_rx_defer++;
1208
1209 mutex_exit(&xnbp->xnb_rx_lock);
1210
1211 /* Free mblk_t structs we have consumed. */
1212 freemsgchain(free);
1213
1214 return (mp);
1215 }
1216
1217
1218 static void
1219 xnb_tx_notify_peer(xnb_t *xnbp, boolean_t force)
1220 {
1221 boolean_t notify;
1222
1223 ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock));
1224
1225 /* LINTED: constant in conditional context */
1226 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xnbp->xnb_tx_ring, notify);
1227 if (notify || force) {
1228 ec_notify_via_evtchn(xnbp->xnb_evtchn);
1229 xnbp->xnb_stat_tx_notify_sent++;
1230 } else {
1231 xnbp->xnb_stat_tx_notify_deferred++;
1232 }
1233 }
1234
1235 static void
1236 xnb_tx_mark_complete(xnb_t *xnbp, RING_IDX id, int16_t status)
1237 {
1238 RING_IDX i;
1239 netif_tx_response_t *txresp;
1240
1241 ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock));
1242
1243 i = xnbp->xnb_tx_ring.rsp_prod_pvt;
1244
1245 txresp = RING_GET_RESPONSE(&xnbp->xnb_tx_ring, i);
1246 txresp->id = id;
1247 txresp->status = status;
1248
1249 xnbp->xnb_tx_ring.rsp_prod_pvt = i + 1;
1250
1251 /*
1252 * Note that we don't push the change to the peer here - that
1253 * is the callers responsibility.
1254 */
1255 }
1256
1257 static void
1258 xnb_txbuf_recycle(xnb_txbuf_t *txp)
1259 {
1260 xnb_t *xnbp = txp->xt_xnbp;
1261
1262 kmem_cache_free(xnbp->xnb_tx_buf_cache, txp);
1263
1264 xnbp->xnb_tx_buf_outstanding--;
1265 }
1266
1267 static int
1268 xnb_txbuf_constructor(void *buf, void *arg, int kmflag)
1269 {
1270 _NOTE(ARGUNUSED(kmflag));
1271 xnb_txbuf_t *txp = buf;
1272 xnb_t *xnbp = arg;
1273 size_t len;
1274 ddi_dma_cookie_t dma_cookie;
1275 uint_t ncookies;
1276
1277 txp->xt_free_rtn.free_func = xnb_txbuf_recycle;
1278 txp->xt_free_rtn.free_arg = (caddr_t)txp;
1279 txp->xt_xnbp = xnbp;
1280 txp->xt_next = NULL;
1281
1282 if (ddi_dma_alloc_handle(xnbp->xnb_devinfo, &buf_dma_attr,
1283 0, 0, &txp->xt_dma_handle) != DDI_SUCCESS)
1284 goto failure;
1285
1286 if (ddi_dma_mem_alloc(txp->xt_dma_handle, PAGESIZE, &data_accattr,
1287 DDI_DMA_STREAMING, 0, 0, &txp->xt_buf, &len,
1288 &txp->xt_acc_handle) != DDI_SUCCESS)
1289 goto failure_1;
1290
1291 if (ddi_dma_addr_bind_handle(txp->xt_dma_handle, NULL, txp->xt_buf,
1292 len, DDI_DMA_RDWR | DDI_DMA_STREAMING, DDI_DMA_DONTWAIT, 0,
1293 &dma_cookie, &ncookies)
1294 != DDI_DMA_MAPPED)
1295 goto failure_2;
1296 ASSERT(ncookies == 1);
1297
1298 txp->xt_mfn = xnb_btop(dma_cookie.dmac_laddress);
1299 txp->xt_buflen = dma_cookie.dmac_size;
1300
1301 DTRACE_PROBE(txbuf_allocated);
1302
1303 atomic_inc_32(&xnbp->xnb_tx_buf_count);
1304 xnbp->xnb_tx_buf_outstanding++;
1305
1306 return (0);
1307
1308 failure_2:
1309 ddi_dma_mem_free(&txp->xt_acc_handle);
1310
1311 failure_1:
1312 ddi_dma_free_handle(&txp->xt_dma_handle);
1313
1314 failure:
1315
1316 return (-1);
1317 }
1318
1319 static void
1320 xnb_txbuf_destructor(void *buf, void *arg)
1321 {
1322 xnb_txbuf_t *txp = buf;
1323 xnb_t *xnbp = arg;
1324
1325 (void) ddi_dma_unbind_handle(txp->xt_dma_handle);
1326 ddi_dma_mem_free(&txp->xt_acc_handle);
1327 ddi_dma_free_handle(&txp->xt_dma_handle);
1328
1329 atomic_dec_32(&xnbp->xnb_tx_buf_count);
1330 }
1331
1332 /*
1333 * Take packets from the peer and deliver them onward.
1334 */
1335 static mblk_t *
1336 xnb_from_peer(xnb_t *xnbp)
1337 {
1338 RING_IDX start, end, loop;
1339 gnttab_copy_t *cop;
1340 xnb_txbuf_t **txpp;
1341 netif_tx_request_t *txreq;
1342 boolean_t work_to_do, need_notify = B_FALSE;
1343 mblk_t *head, *tail;
1344 int n_data_req, i;
1345
1346 ASSERT(MUTEX_HELD(&xnbp->xnb_tx_lock));
1347
1348 head = tail = NULL;
1349 around:
1350
1351 /* LINTED: constant in conditional context */
1352 RING_FINAL_CHECK_FOR_REQUESTS(&xnbp->xnb_tx_ring, work_to_do);
1353 if (!work_to_do) {
1354 finished:
1355 xnb_tx_notify_peer(xnbp, need_notify);
1356
1357 return (head);
1358 }
1359
1360 start = xnbp->xnb_tx_ring.req_cons;
1361 end = xnbp->xnb_tx_ring.sring->req_prod;
1362
1363 if ((end - start) > NET_TX_RING_SIZE) {
1364 /*
1365 * This usually indicates that the frontend driver is
1366 * misbehaving, as it's not possible to have more than
1367 * NET_TX_RING_SIZE ring elements in play at any one
1368 * time.
1369 *
1370 * We reset the ring pointers to the state declared by
1371 * the frontend and try to carry on.
1372 */
1373 cmn_err(CE_WARN, "xnb_from_peer: domain %d tried to give us %u "
1374 "items in the ring, resetting and trying to recover.",
1375 xnbp->xnb_peer, (end - start));
1376
1377 /* LINTED: constant in conditional context */
1378 BACK_RING_ATTACH(&xnbp->xnb_tx_ring,
1379 (netif_tx_sring_t *)xnbp->xnb_tx_ring_addr, PAGESIZE);
1380
1381 goto around;
1382 }
1383
1384 loop = start;
1385 cop = xnbp->xnb_tx_cop;
1386 txpp = xnbp->xnb_tx_bufp;
1387 n_data_req = 0;
1388
1389 while (loop < end) {
1390 static const uint16_t acceptable_flags =
1391 NETTXF_csum_blank |
1392 NETTXF_data_validated |
1393 NETTXF_extra_info;
1394 uint16_t unexpected_flags;
1395
1396 txreq = RING_GET_REQUEST(&xnbp->xnb_tx_ring, loop);
1397
1398 unexpected_flags = txreq->flags & ~acceptable_flags;
1399 if (unexpected_flags != 0) {
1400 /*
1401 * The peer used flag bits that we do not
1402 * recognize.
1403 */
1404 cmn_err(CE_WARN, "xnb_from_peer: "
1405 "unexpected flag bits (0x%x) from peer "
1406 "in transmit request",
1407 unexpected_flags);
1408 xnbp->xnb_stat_tx_unexpected_flags++;
1409
1410 /* Mark this entry as failed. */
1411 xnb_tx_mark_complete(xnbp, txreq->id, NETIF_RSP_ERROR);
1412 need_notify = B_TRUE;
1413
1414 } else if (txreq->flags & NETTXF_extra_info) {
1415 struct netif_extra_info *erp;
1416 boolean_t status;
1417
1418 loop++; /* Consume another slot in the ring. */
1419 ASSERT(loop <= end);
1420
1421 erp = (struct netif_extra_info *)
1422 RING_GET_REQUEST(&xnbp->xnb_tx_ring, loop);
1423
1424 switch (erp->type) {
1425 case XEN_NETIF_EXTRA_TYPE_MCAST_ADD:
1426 ASSERT(xnbp->xnb_multicast_control);
1427 status = xnbp->xnb_flavour->xf_mcast_add(xnbp,
1428 &erp->u.mcast.addr);
1429 break;
1430 case XEN_NETIF_EXTRA_TYPE_MCAST_DEL:
1431 ASSERT(xnbp->xnb_multicast_control);
1432 status = xnbp->xnb_flavour->xf_mcast_del(xnbp,
1433 &erp->u.mcast.addr);
1434 break;
1435 default:
1436 status = B_FALSE;
1437 cmn_err(CE_WARN, "xnb_from_peer: "
1438 "unknown extra type %d", erp->type);
1439 break;
1440 }
1441
1442 xnb_tx_mark_complete(xnbp, txreq->id,
1443 status ? NETIF_RSP_OKAY : NETIF_RSP_ERROR);
1444 need_notify = B_TRUE;
1445
1446 } else if ((txreq->offset > PAGESIZE) ||
1447 (txreq->offset + txreq->size > PAGESIZE)) {
1448 /*
1449 * Peer attempted to refer to data beyond the
1450 * end of the granted page.
1451 */
1452 cmn_err(CE_WARN, "xnb_from_peer: "
1453 "attempt to refer beyond the end of granted "
1454 "page in txreq (offset %d, size %d).",
1455 txreq->offset, txreq->size);
1456 xnbp->xnb_stat_tx_overflow_page++;
1457
1458 /* Mark this entry as failed. */
1459 xnb_tx_mark_complete(xnbp, txreq->id, NETIF_RSP_ERROR);
1460 need_notify = B_TRUE;
1461
1462 } else {
1463 xnb_txbuf_t *txp;
1464
1465 txp = kmem_cache_alloc(xnbp->xnb_tx_buf_cache,
1466 KM_NOSLEEP);
1467 if (txp == NULL)
1468 break;
1469
1470 txp->xt_mblk = desballoc((unsigned char *)txp->xt_buf,
1471 txp->xt_buflen, 0, &txp->xt_free_rtn);
1472 if (txp->xt_mblk == NULL) {
1473 kmem_cache_free(xnbp->xnb_tx_buf_cache, txp);
1474 break;
1475 }
1476
1477 txp->xt_idx = loop;
1478 txp->xt_id = txreq->id;
1479
1480 cop->source.u.ref = txreq->gref;
1481 cop->source.domid = xnbp->xnb_peer;
1482 cop->source.offset = txreq->offset;
1483
1484 cop->dest.u.gmfn = txp->xt_mfn;
1485 cop->dest.domid = DOMID_SELF;
1486 cop->dest.offset = 0;
1487
1488 cop->len = txreq->size;
1489 cop->flags = GNTCOPY_source_gref;
1490 cop->status = 0;
1491
1492 *txpp = txp;
1493
1494 txpp++;
1495 cop++;
1496 n_data_req++;
1497
1498 ASSERT(n_data_req <= NET_TX_RING_SIZE);
1499 }
1500
1501 loop++;
1502 }
1503
1504 xnbp->xnb_tx_ring.req_cons = loop;
1505
1506 if (n_data_req == 0)
1507 goto around;
1508
1509 if (HYPERVISOR_grant_table_op(GNTTABOP_copy,
1510 xnbp->xnb_tx_cop, n_data_req) != 0) {
1511
1512 cmn_err(CE_WARN, "xnb_from_peer: copy operation failed");
1513
1514 txpp = xnbp->xnb_tx_bufp;
1515 i = n_data_req;
1516 while (i > 0) {
1517 kmem_cache_free(xnbp->xnb_tx_buf_cache, *txpp);
1518 txpp++;
1519 i--;
1520 }
1521
1522 goto finished;
1523 }
1524
1525 txpp = xnbp->xnb_tx_bufp;
1526 cop = xnbp->xnb_tx_cop;
1527 i = n_data_req;
1528
1529 while (i > 0) {
1530 xnb_txbuf_t *txp = *txpp;
1531
1532 txreq = RING_GET_REQUEST(&xnbp->xnb_tx_ring, txp->xt_idx);
1533
1534 if (cop->status != 0) {
1535 #ifdef XNB_DEBUG
1536 cmn_err(CE_WARN, "xnb_from_peer: "
1537 "txpp 0x%p failed (%d)",
1538 (void *)*txpp, cop->status);
1539 #endif /* XNB_DEBUG */
1540 xnb_tx_mark_complete(xnbp, txp->xt_id, NETIF_RSP_ERROR);
1541 freemsg(txp->xt_mblk);
1542 } else {
1543 mblk_t *mp;
1544
1545 mp = txp->xt_mblk;
1546 mp->b_rptr = mp->b_wptr = (unsigned char *)txp->xt_buf;
1547 mp->b_wptr += txreq->size;
1548 mp->b_next = NULL;
1549
1550 /*
1551 * If there are checksum flags, process them
1552 * appropriately.
1553 */
1554 if ((txreq->flags &
1555 (NETTXF_csum_blank | NETTXF_data_validated))
1556 != 0) {
1557 mp = xnbp->xnb_flavour->xf_cksum_from_peer(xnbp,
1558 mp, txreq->flags);
1559 xnbp->xnb_stat_tx_cksum_no_need++;
1560
1561 txp->xt_mblk = mp;
1562 }
1563
1564 if (head == NULL) {
1565 ASSERT(tail == NULL);
1566 head = mp;
1567 } else {
1568 ASSERT(tail != NULL);
1569 tail->b_next = mp;
1570 }
1571 tail = mp;
1572
1573 xnbp->xnb_stat_opackets++;
1574 xnbp->xnb_stat_obytes += txreq->size;
1575
1576 xnb_tx_mark_complete(xnbp, txp->xt_id, NETIF_RSP_OKAY);
1577 }
1578
1579 txpp++;
1580 cop++;
1581 i--;
1582 }
1583
1584 goto around;
1585 /* NOTREACHED */
1586 }
1587
1588 static uint_t
1589 xnb_intr(caddr_t arg)
1590 {
1591 xnb_t *xnbp = (xnb_t *)arg;
1592 mblk_t *mp;
1593
1594 xnbp->xnb_stat_intr++;
1595
1596 mutex_enter(&xnbp->xnb_tx_lock);
1597
1598 ASSERT(xnbp->xnb_connected);
1599
1600 mp = xnb_from_peer(xnbp);
1601
1602 mutex_exit(&xnbp->xnb_tx_lock);
1603
1604 if (!xnbp->xnb_hotplugged) {
1605 xnbp->xnb_stat_tx_too_early++;
1606 goto fail;
1607 }
1608 if (mp == NULL) {
1609 xnbp->xnb_stat_spurious_intr++;
1610 goto fail;
1611 }
1612
1613 xnbp->xnb_flavour->xf_from_peer(xnbp, mp);
1614
1615 return (DDI_INTR_CLAIMED);
1616
1617 fail:
1618 freemsgchain(mp);
1619 return (DDI_INTR_CLAIMED);
1620 }
1621
1622 /*
1623 * Read our configuration from xenstore.
1624 */
1625 boolean_t
1626 xnb_read_xs_config(xnb_t *xnbp)
1627 {
1628 char *xsname;
1629 char mac[ETHERADDRL * 3];
1630
1631 xsname = xvdi_get_xsname(xnbp->xnb_devinfo);
1632
1633 if (xenbus_scanf(XBT_NULL, xsname,
1634 "mac", "%s", mac) != 0) {
1635 cmn_err(CE_WARN, "xnb_attach: "
1636 "cannot read mac address from %s",
1637 xsname);
1638 return (B_FALSE);
1639 }
1640
1641 if (ether_aton(mac, xnbp->xnb_mac_addr) != ETHERADDRL) {
1642 cmn_err(CE_WARN,
1643 "xnb_attach: cannot parse mac address %s",
1644 mac);
1645 return (B_FALSE);
1646 }
1647
1648 return (B_TRUE);
1649 }
1650
1651 /*
1652 * Read the configuration of the peer from xenstore.
1653 */
1654 boolean_t
1655 xnb_read_oe_config(xnb_t *xnbp)
1656 {
1657 char *oename;
1658 int i;
1659
1660 oename = xvdi_get_oename(xnbp->xnb_devinfo);
1661
1662 if (xenbus_gather(XBT_NULL, oename,
1663 "event-channel", "%u", &xnbp->xnb_fe_evtchn,
1664 "tx-ring-ref", "%lu", &xnbp->xnb_tx_ring_ref,
1665 "rx-ring-ref", "%lu", &xnbp->xnb_rx_ring_ref,
1666 NULL) != 0) {
1667 cmn_err(CE_WARN, "xnb_read_oe_config: "
1668 "cannot read other-end details from %s",
1669 oename);
1670 return (B_FALSE);
1671 }
1672
1673 /*
1674 * Check whether our peer requests receive side hypervisor
1675 * copy.
1676 */
1677 if (xenbus_scanf(XBT_NULL, oename,
1678 "request-rx-copy", "%d", &i) != 0)
1679 i = 0;
1680 if (i != 0)
1681 xnbp->xnb_rx_hv_copy = B_TRUE;
1682
1683 /*
1684 * Check whether our peer requests multicast_control.
1685 */
1686 if (xenbus_scanf(XBT_NULL, oename,
1687 "request-multicast-control", "%d", &i) != 0)
1688 i = 0;
1689 if (i != 0)
1690 xnbp->xnb_multicast_control = B_TRUE;
1691
1692 /*
1693 * The Linux backend driver here checks to see if the peer has
1694 * set 'feature-no-csum-offload'. This is used to indicate
1695 * that the guest cannot handle receiving packets without a
1696 * valid checksum. We don't check here, because packets passed
1697 * to the peer _always_ have a valid checksum.
1698 *
1699 * There are three cases:
1700 *
1701 * - the NIC is dedicated: packets from the wire should always
1702 * have a valid checksum. If the hardware validates the
1703 * checksum then the relevant bit will be set in the packet
1704 * attributes and we will inform the peer. It can choose to
1705 * ignore the hardware verification.
1706 *
1707 * - the NIC is shared (VNIC) and a packet originates from the
1708 * wire: this is the same as the case above - the packets
1709 * will have a valid checksum.
1710 *
1711 * - the NIC is shared (VNIC) and a packet originates from the
1712 * host: the MAC layer ensures that all such packets have a
1713 * valid checksum by calculating one if the stack did not.
1714 */
1715
1716 return (B_TRUE);
1717 }
1718
1719 void
1720 xnb_start_connect(xnb_t *xnbp)
1721 {
1722 dev_info_t *dip = xnbp->xnb_devinfo;
1723
1724 if (!xnb_connect_rings(dip)) {
1725 cmn_err(CE_WARN, "xnb_start_connect: "
1726 "cannot connect rings");
1727 goto failed;
1728 }
1729
1730 if (!xnbp->xnb_flavour->xf_start_connect(xnbp)) {
1731 cmn_err(CE_WARN, "xnb_start_connect: "
1732 "flavour failed to connect");
1733 goto failed;
1734 }
1735
1736 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateConnected);
1737 return;
1738
1739 failed:
1740 xnbp->xnb_flavour->xf_peer_disconnected(xnbp);
1741 xnb_disconnect_rings(dip);
1742 (void) xvdi_switch_state(dip, XBT_NULL,
1743 XenbusStateClosed);
1744 (void) xvdi_post_event(dip, XEN_HP_REMOVE);
1745 }
1746
1747 static boolean_t
1748 xnb_connect_rings(dev_info_t *dip)
1749 {
1750 xnb_t *xnbp = ddi_get_driver_private(dip);
1751 struct gnttab_map_grant_ref map_op;
1752
1753 /*
1754 * Cannot attempt to connect the rings if already connected.
1755 */
1756 ASSERT(!xnbp->xnb_connected);
1757
1758 /*
1759 * 1. allocate a vaddr for the tx page, one for the rx page.
1760 * 2. call GNTTABOP_map_grant_ref to map the relevant pages
1761 * into the allocated vaddr (one for tx, one for rx).
1762 * 3. call EVTCHNOP_bind_interdomain to have the event channel
1763 * bound to this domain.
1764 * 4. associate the event channel with an interrupt.
1765 * 5. enable the interrupt.
1766 */
1767
1768 /* 1.tx */
1769 xnbp->xnb_tx_ring_addr = vmem_xalloc(heap_arena, PAGESIZE, PAGESIZE,
1770 0, 0, 0, 0, VM_SLEEP);
1771 ASSERT(xnbp->xnb_tx_ring_addr != NULL);
1772
1773 /* 2.tx */
1774 map_op.host_addr = (uint64_t)((long)xnbp->xnb_tx_ring_addr);
1775 map_op.flags = GNTMAP_host_map;
1776 map_op.ref = xnbp->xnb_tx_ring_ref;
1777 map_op.dom = xnbp->xnb_peer;
1778 hat_prepare_mapping(kas.a_hat, xnbp->xnb_tx_ring_addr, NULL);
1779 if (xen_map_gref(GNTTABOP_map_grant_ref, &map_op, 1, B_FALSE) != 0 ||
1780 map_op.status != 0) {
1781 cmn_err(CE_WARN, "xnb_connect_rings: cannot map tx-ring page.");
1782 goto fail;
1783 }
1784 xnbp->xnb_tx_ring_handle = map_op.handle;
1785
1786 /* LINTED: constant in conditional context */
1787 BACK_RING_INIT(&xnbp->xnb_tx_ring,
1788 (netif_tx_sring_t *)xnbp->xnb_tx_ring_addr, PAGESIZE);
1789
1790 /* 1.rx */
1791 xnbp->xnb_rx_ring_addr = vmem_xalloc(heap_arena, PAGESIZE, PAGESIZE,
1792 0, 0, 0, 0, VM_SLEEP);
1793 ASSERT(xnbp->xnb_rx_ring_addr != NULL);
1794
1795 /* 2.rx */
1796 map_op.host_addr = (uint64_t)((long)xnbp->xnb_rx_ring_addr);
1797 map_op.flags = GNTMAP_host_map;
1798 map_op.ref = xnbp->xnb_rx_ring_ref;
1799 map_op.dom = xnbp->xnb_peer;
1800 hat_prepare_mapping(kas.a_hat, xnbp->xnb_rx_ring_addr, NULL);
1801 if (xen_map_gref(GNTTABOP_map_grant_ref, &map_op, 1, B_FALSE) != 0 ||
1802 map_op.status != 0) {
1803 cmn_err(CE_WARN, "xnb_connect_rings: cannot map rx-ring page.");
1804 goto fail;
1805 }
1806 xnbp->xnb_rx_ring_handle = map_op.handle;
1807
1808 /* LINTED: constant in conditional context */
1809 BACK_RING_INIT(&xnbp->xnb_rx_ring,
1810 (netif_rx_sring_t *)xnbp->xnb_rx_ring_addr, PAGESIZE);
1811
1812 /* 3 */
1813 if (xvdi_bind_evtchn(dip, xnbp->xnb_fe_evtchn) != DDI_SUCCESS) {
1814 cmn_err(CE_WARN, "xnb_connect_rings: "
1815 "cannot bind event channel %d", xnbp->xnb_evtchn);
1816 xnbp->xnb_evtchn = INVALID_EVTCHN;
1817 goto fail;
1818 }
1819 xnbp->xnb_evtchn = xvdi_get_evtchn(dip);
1820
1821 /*
1822 * It would be good to set the state to XenbusStateConnected
1823 * here as well, but then what if ddi_add_intr() failed?
1824 * Changing the state in the store will be noticed by the peer
1825 * and cannot be "taken back".
1826 */
1827 mutex_enter(&xnbp->xnb_tx_lock);
1828 mutex_enter(&xnbp->xnb_rx_lock);
1829
1830 xnbp->xnb_connected = B_TRUE;
1831
1832 mutex_exit(&xnbp->xnb_rx_lock);
1833 mutex_exit(&xnbp->xnb_tx_lock);
1834
1835 /* 4, 5 */
1836 if (ddi_add_intr(dip, 0, NULL, NULL, xnb_intr, (caddr_t)xnbp)
1837 != DDI_SUCCESS) {
1838 cmn_err(CE_WARN, "xnb_connect_rings: cannot add interrupt");
1839 goto fail;
1840 }
1841 xnbp->xnb_irq = B_TRUE;
1842
1843 return (B_TRUE);
1844
1845 fail:
1846 mutex_enter(&xnbp->xnb_tx_lock);
1847 mutex_enter(&xnbp->xnb_rx_lock);
1848
1849 xnbp->xnb_connected = B_FALSE;
1850
1851 mutex_exit(&xnbp->xnb_rx_lock);
1852 mutex_exit(&xnbp->xnb_tx_lock);
1853
1854 return (B_FALSE);
1855 }
1856
1857 static void
1858 xnb_disconnect_rings(dev_info_t *dip)
1859 {
1860 xnb_t *xnbp = ddi_get_driver_private(dip);
1861
1862 if (xnbp->xnb_irq) {
1863 ddi_remove_intr(dip, 0, NULL);
1864 xnbp->xnb_irq = B_FALSE;
1865 }
1866
1867 if (xnbp->xnb_evtchn != INVALID_EVTCHN) {
1868 xvdi_free_evtchn(dip);
1869 xnbp->xnb_evtchn = INVALID_EVTCHN;
1870 }
1871
1872 if (xnbp->xnb_rx_ring_handle != INVALID_GRANT_HANDLE) {
1873 struct gnttab_unmap_grant_ref unmap_op;
1874
1875 unmap_op.host_addr = (uint64_t)(uintptr_t)
1876 xnbp->xnb_rx_ring_addr;
1877 unmap_op.dev_bus_addr = 0;
1878 unmap_op.handle = xnbp->xnb_rx_ring_handle;
1879 if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
1880 &unmap_op, 1) != 0)
1881 cmn_err(CE_WARN, "xnb_disconnect_rings: "
1882 "cannot unmap rx-ring page (%d)",
1883 unmap_op.status);
1884
1885 xnbp->xnb_rx_ring_handle = INVALID_GRANT_HANDLE;
1886 }
1887
1888 if (xnbp->xnb_rx_ring_addr != NULL) {
1889 hat_release_mapping(kas.a_hat, xnbp->xnb_rx_ring_addr);
1890 vmem_free(heap_arena, xnbp->xnb_rx_ring_addr, PAGESIZE);
1891 xnbp->xnb_rx_ring_addr = NULL;
1892 }
1893
1894 if (xnbp->xnb_tx_ring_handle != INVALID_GRANT_HANDLE) {
1895 struct gnttab_unmap_grant_ref unmap_op;
1896
1897 unmap_op.host_addr = (uint64_t)(uintptr_t)
1898 xnbp->xnb_tx_ring_addr;
1899 unmap_op.dev_bus_addr = 0;
1900 unmap_op.handle = xnbp->xnb_tx_ring_handle;
1901 if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
1902 &unmap_op, 1) != 0)
1903 cmn_err(CE_WARN, "xnb_disconnect_rings: "
1904 "cannot unmap tx-ring page (%d)",
1905 unmap_op.status);
1906
1907 xnbp->xnb_tx_ring_handle = INVALID_GRANT_HANDLE;
1908 }
1909
1910 if (xnbp->xnb_tx_ring_addr != NULL) {
1911 hat_release_mapping(kas.a_hat, xnbp->xnb_tx_ring_addr);
1912 vmem_free(heap_arena, xnbp->xnb_tx_ring_addr, PAGESIZE);
1913 xnbp->xnb_tx_ring_addr = NULL;
1914 }
1915 }
1916
1917 static void
1918 xnb_oe_state_change(dev_info_t *dip, ddi_eventcookie_t id,
1919 void *arg, void *impl_data)
1920 {
1921 _NOTE(ARGUNUSED(id, arg));
1922 xnb_t *xnbp = ddi_get_driver_private(dip);
1923 XenbusState new_state = *(XenbusState *)impl_data;
1924
1925 ASSERT(xnbp != NULL);
1926
1927 switch (new_state) {
1928 case XenbusStateConnected:
1929 /* spurious state change */
1930 if (xnbp->xnb_connected)
1931 return;
1932
1933 if (!xnb_read_oe_config(xnbp) ||
1934 !xnbp->xnb_flavour->xf_peer_connected(xnbp)) {
1935 cmn_err(CE_WARN, "xnb_oe_state_change: "
1936 "read otherend config error");
1937 (void) xvdi_switch_state(dip, XBT_NULL,
1938 XenbusStateClosed);
1939 (void) xvdi_post_event(dip, XEN_HP_REMOVE);
1940
1941 break;
1942 }
1943
1944
1945 mutex_enter(&xnbp->xnb_state_lock);
1946 xnbp->xnb_fe_status = XNB_STATE_READY;
1947 if (xnbp->xnb_be_status == XNB_STATE_READY)
1948 xnb_start_connect(xnbp);
1949 mutex_exit(&xnbp->xnb_state_lock);
1950
1951 /*
1952 * Now that we've attempted to connect it's reasonable
1953 * to allow an attempt to detach.
1954 */
1955 xnbp->xnb_detachable = B_TRUE;
1956
1957 break;
1958
1959 case XenbusStateClosing:
1960 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosing);
1961
1962 break;
1963
1964 case XenbusStateClosed:
1965 xnbp->xnb_flavour->xf_peer_disconnected(xnbp);
1966
1967 mutex_enter(&xnbp->xnb_tx_lock);
1968 mutex_enter(&xnbp->xnb_rx_lock);
1969
1970 xnb_disconnect_rings(dip);
1971 xnbp->xnb_connected = B_FALSE;
1972
1973 mutex_exit(&xnbp->xnb_rx_lock);
1974 mutex_exit(&xnbp->xnb_tx_lock);
1975
1976 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosed);
1977 (void) xvdi_post_event(dip, XEN_HP_REMOVE);
1978 /*
1979 * In all likelyhood this is already set (in the above
1980 * case), but if the peer never attempted to connect
1981 * and the domain is destroyed we get here without
1982 * having been through the case above, so we set it to
1983 * be sure.
1984 */
1985 xnbp->xnb_detachable = B_TRUE;
1986
1987 break;
1988
1989 default:
1990 break;
1991 }
1992 }
1993
1994 static void
1995 xnb_hp_state_change(dev_info_t *dip, ddi_eventcookie_t id,
1996 void *arg, void *impl_data)
1997 {
1998 _NOTE(ARGUNUSED(id, arg));
1999 xnb_t *xnbp = ddi_get_driver_private(dip);
2000 xendev_hotplug_state_t state = *(xendev_hotplug_state_t *)impl_data;
2001
2002 ASSERT(xnbp != NULL);
2003
2004 switch (state) {
2005 case Connected:
2006 /* spurious hotplug event */
2007 if (xnbp->xnb_hotplugged)
2008 break;
2009
2010 if (!xnb_read_xs_config(xnbp))
2011 break;
2012
2013 if (!xnbp->xnb_flavour->xf_hotplug_connected(xnbp))
2014 break;
2015
2016 mutex_enter(&xnbp->xnb_tx_lock);
2017 mutex_enter(&xnbp->xnb_rx_lock);
2018
2019 xnbp->xnb_hotplugged = B_TRUE;
2020
2021 mutex_exit(&xnbp->xnb_rx_lock);
2022 mutex_exit(&xnbp->xnb_tx_lock);
2023
2024 mutex_enter(&xnbp->xnb_state_lock);
2025 xnbp->xnb_be_status = XNB_STATE_READY;
2026 if (xnbp->xnb_fe_status == XNB_STATE_READY)
2027 xnb_start_connect(xnbp);
2028 mutex_exit(&xnbp->xnb_state_lock);
2029
2030 break;
2031
2032 default:
2033 break;
2034 }
2035 }
2036
2037 static struct modldrv modldrv = {
2038 &mod_miscops, "xnb",
2039 };
2040
2041 static struct modlinkage modlinkage = {
2042 MODREV_1, &modldrv, NULL
2043 };
2044
2045 int
2046 _init(void)
2047 {
2048 int i;
2049
2050 mutex_init(&xnb_alloc_page_lock, NULL, MUTEX_DRIVER, NULL);
2051
2052 i = mod_install(&modlinkage);
2053 if (i != DDI_SUCCESS)
2054 mutex_destroy(&xnb_alloc_page_lock);
2055
2056 return (i);
2057 }
2058
2059 int
2060 _info(struct modinfo *modinfop)
2061 {
2062 return (mod_info(&modlinkage, modinfop));
2063 }
2064
2065 int
2066 _fini(void)
2067 {
2068 int i;
2069
2070 i = mod_remove(&modlinkage);
2071 if (i == DDI_SUCCESS)
2072 mutex_destroy(&xnb_alloc_page_lock);
2073
2074 return (i);
2075 }
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