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 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 * Copyright 2017 Joyent, Inc.
25 */
26
27 /*
28 * General Soft rings - Simulating Rx rings in S/W.
29 *
30 * Soft ring is a data abstraction containing a queue and a worker
31 * thread and represents a hardware Rx ring in software. Each soft
32 * ring set can have a collection of soft rings for separating
33 * L3/L4 specific traffic (IPv4 from IPv6 or TCP from UDP) or for
34 * allowing a higher degree of parallelism by sending traffic to
35 * one of the soft rings for a SRS (using a hash on src IP or port).
36 * Each soft ring worker thread can be bound to a different CPU
37 * allowing the processing for each soft ring to happen in parallel
38 * and independent from each other.
39 *
40 * Protocol soft rings:
41 *
42 * Each SRS has at an minimum 3 softrings. One each for IPv4 TCP,
43 * IPv4 UDP and rest (OTH - for IPv6 and everything else). The
44 * SRS does dynamic polling and enforces link level bandwidth but
45 * it does so for all traffic (IPv4 and IPv6 and all protocols) on
46 * that link. However, each protocol layer wants a different
47 * behaviour. For instance IPv4 TCP has per CPU squeues which
48 * enforce their own polling and flow control so IPv4 TCP traffic
49 * needs to go to a separate soft ring which can be polled by the
50 * TCP squeue. It also allows TCP squeue to push back flow control
51 * all the way to NIC hardware (if it puts its corresponding soft
52 * ring in the poll mode and soft ring queue builds up, the
53 * shared srs_poll_pkt_cnt goes up and SRS automatically stops
54 * more packets from entering the system).
55 *
56 * Similarly, the UDP benefits from a DLS bypass and packet chaining
57 * so sending it to a separate soft ring is desired. All the rest of
58 * the traffic (including IPv6 is sent to OTH softring). The IPv6
59 * traffic current goes through OTH softring and via DLS because
60 * it need more processing to be done. Irrespective of the sap
61 * (IPv4 or IPv6) or the transport, the dynamic polling, B/W enforcement,
62 * cpu assignment, fanout, etc apply to all traffic since they
63 * are implement by the SRS which is agnostic to sap or transport.
64 *
65 * Fanout soft rings:
66 *
67 * On a multithreaded system, we can assign more CPU and multi thread
68 * the stack by creating a soft ring per CPU and spreading traffic
69 * based on a hash computed on src IP etc. Since we still need to
70 * keep the protocol separation, we create a set of 3 soft ring per
71 * CPU (specified by cpu list or degree of fanout).
72 *
73 * NOTE: See the block level comment on top of mac_sched.c
74 */
75
76 #include <sys/types.h>
77 #include <sys/callb.h>
78 #include <sys/sdt.h>
79 #include <sys/strsubr.h>
80 #include <sys/strsun.h>
81 #include <sys/vlan.h>
82 #include <inet/ipsec_impl.h>
83 #include <inet/ip_impl.h>
84 #include <inet/sadb.h>
85 #include <inet/ipsecesp.h>
86 #include <inet/ipsecah.h>
87
88 #include <sys/mac_impl.h>
89 #include <sys/mac_client_impl.h>
90 #include <sys/mac_soft_ring.h>
91 #include <sys/mac_flow_impl.h>
92 #include <sys/mac_stat.h>
93
94 static void mac_rx_soft_ring_drain(mac_soft_ring_t *);
95 static void mac_soft_ring_fire(void *);
96 static void mac_soft_ring_worker(mac_soft_ring_t *);
97 static void mac_tx_soft_ring_drain(mac_soft_ring_t *);
98
99 uint32_t mac_tx_soft_ring_max_q_cnt = 100000;
100 uint32_t mac_tx_soft_ring_hiwat = 1000;
101
102 extern kmem_cache_t *mac_soft_ring_cache;
103
104 #define ADD_SOFTRING_TO_SET(mac_srs, softring) { \
105 if (mac_srs->srs_soft_ring_head == NULL) { \
106 mac_srs->srs_soft_ring_head = softring; \
107 mac_srs->srs_soft_ring_tail = softring; \
108 } else { \
109 /* ADD to the list */ \
110 softring->s_ring_prev = \
111 mac_srs->srs_soft_ring_tail; \
112 mac_srs->srs_soft_ring_tail->s_ring_next = softring; \
113 mac_srs->srs_soft_ring_tail = softring; \
114 } \
115 mac_srs->srs_soft_ring_count++; \
116 }
117
118 /*
119 * mac_soft_ring_worker_wakeup
120 *
121 * Wake up the soft ring worker thread to process the queue as long
122 * as no one else is processing it and upper layer (client) is still
123 * ready to receive packets.
124 */
125 void
126 mac_soft_ring_worker_wakeup(mac_soft_ring_t *ringp)
127 {
128 ASSERT(MUTEX_HELD(&ringp->s_ring_lock));
129 if (!(ringp->s_ring_state & S_RING_PROC) &&
130 !(ringp->s_ring_state & S_RING_BLANK) &&
131 (ringp->s_ring_tid == NULL)) {
132 if (ringp->s_ring_wait != 0) {
133 ringp->s_ring_tid =
134 timeout(mac_soft_ring_fire, ringp,
135 ringp->s_ring_wait);
136 } else {
137 /* Schedule the worker thread. */
138 cv_signal(&ringp->s_ring_async);
139 }
140 }
141 }
142
143 /*
144 * mac_soft_ring_create
145 *
146 * Create a soft ring, do the necessary setup and bind the worker
147 * thread to the assigned CPU.
148 */
149 mac_soft_ring_t *
150 mac_soft_ring_create(int id, clock_t wait, uint16_t type,
151 pri_t pri, mac_client_impl_t *mcip, mac_soft_ring_set_t *mac_srs,
152 processorid_t cpuid, mac_direct_rx_t rx_func, void *x_arg1,
153 mac_resource_handle_t x_arg2)
154 {
155 mac_soft_ring_t *ringp;
156 char name[S_RING_NAMELEN];
157
158 bzero(name, 64);
159 ringp = kmem_cache_alloc(mac_soft_ring_cache, KM_SLEEP);
160
161 if (type & ST_RING_TCP) {
162 (void) snprintf(name, sizeof (name),
163 "mac_tcp_soft_ring_%d_%p", id, (void *)mac_srs);
164 } else if (type & ST_RING_UDP) {
165 (void) snprintf(name, sizeof (name),
166 "mac_udp_soft_ring_%d_%p", id, (void *)mac_srs);
167 } else if (type & ST_RING_OTH) {
168 (void) snprintf(name, sizeof (name),
169 "mac_oth_soft_ring_%d_%p", id, (void *)mac_srs);
170 } else {
171 ASSERT(type & ST_RING_TX);
172 (void) snprintf(name, sizeof (name),
173 "mac_tx_soft_ring_%d_%p", id, (void *)mac_srs);
174 }
175
176 bzero(ringp, sizeof (mac_soft_ring_t));
177 (void) strncpy(ringp->s_ring_name, name, S_RING_NAMELEN + 1);
178 ringp->s_ring_name[S_RING_NAMELEN] = '\0';
179 mutex_init(&ringp->s_ring_lock, NULL, MUTEX_DEFAULT, NULL);
180 ringp->s_ring_notify_cb_info.mcbi_lockp = &ringp->s_ring_lock;
181
182 ringp->s_ring_type = type;
183 ringp->s_ring_wait = MSEC_TO_TICK(wait);
184 ringp->s_ring_mcip = mcip;
185 ringp->s_ring_set = mac_srs;
186
187 /*
188 * Protect against access from DR callbacks (mac_walk_srs_bind/unbind)
189 * which can't grab the mac perimeter
190 */
191 mutex_enter(&mac_srs->srs_lock);
192 ADD_SOFTRING_TO_SET(mac_srs, ringp);
193 mutex_exit(&mac_srs->srs_lock);
194
195 /*
196 * set the bind CPU to -1 to indicate
197 * no thread affinity set
198 */
199 ringp->s_ring_cpuid = ringp->s_ring_cpuid_save = -1;
200 ringp->s_ring_worker = thread_create(NULL, 0,
201 mac_soft_ring_worker, ringp, 0, &p0, TS_RUN, pri);
202 if (type & ST_RING_TX) {
203 ringp->s_ring_drain_func = mac_tx_soft_ring_drain;
204 ringp->s_ring_tx_arg1 = x_arg1;
205 ringp->s_ring_tx_arg2 = x_arg2;
206 ringp->s_ring_tx_max_q_cnt = mac_tx_soft_ring_max_q_cnt;
207 ringp->s_ring_tx_hiwat =
208 (mac_tx_soft_ring_hiwat > mac_tx_soft_ring_max_q_cnt) ?
209 mac_tx_soft_ring_max_q_cnt : mac_tx_soft_ring_hiwat;
210 if (mcip->mci_state_flags & MCIS_IS_AGGR) {
211 mac_srs_tx_t *tx = &mac_srs->srs_tx;
212
213 ASSERT(tx->st_soft_rings[
214 ((mac_ring_t *)x_arg2)->mr_index] == NULL);
215 tx->st_soft_rings[((mac_ring_t *)x_arg2)->mr_index] =
216 ringp;
217 }
218 } else {
219 ringp->s_ring_drain_func = mac_rx_soft_ring_drain;
220 ringp->s_ring_rx_func = rx_func;
221 ringp->s_ring_rx_arg1 = x_arg1;
222 ringp->s_ring_rx_arg2 = x_arg2;
223 if (mac_srs->srs_state & SRS_SOFTRING_QUEUE)
224 ringp->s_ring_type |= ST_RING_WORKER_ONLY;
225 }
226 if (cpuid != -1)
227 (void) mac_soft_ring_bind(ringp, cpuid);
228
229 mac_soft_ring_stat_create(ringp);
230
231 return (ringp);
232 }
233
234 /*
235 * mac_soft_ring_free
236 *
237 * Free the soft ring once we are done with it.
238 */
239 void
240 mac_soft_ring_free(mac_soft_ring_t *softring)
241 {
242 ASSERT((softring->s_ring_state &
243 (S_RING_CONDEMNED | S_RING_CONDEMNED_DONE | S_RING_PROC)) ==
244 (S_RING_CONDEMNED | S_RING_CONDEMNED_DONE));
245 mac_pkt_drop(NULL, NULL, softring->s_ring_first, B_FALSE);
246 softring->s_ring_tx_arg2 = NULL;
247 mac_soft_ring_stat_delete(softring);
248 mac_callback_free(softring->s_ring_notify_cb_list);
249 kmem_cache_free(mac_soft_ring_cache, softring);
250 }
251
252 int mac_soft_ring_thread_bind = 1;
253
254 /*
255 * mac_soft_ring_bind
256 *
257 * Bind a soft ring worker thread to supplied CPU.
258 */
259 cpu_t *
260 mac_soft_ring_bind(mac_soft_ring_t *ringp, processorid_t cpuid)
261 {
262 cpu_t *cp;
263 boolean_t clear = B_FALSE;
264
265 ASSERT(MUTEX_HELD(&cpu_lock));
266
267 if (mac_soft_ring_thread_bind == 0) {
268 DTRACE_PROBE1(mac__soft__ring__no__cpu__bound,
269 mac_soft_ring_t *, ringp);
270 return (NULL);
271 }
272
273 cp = cpu_get(cpuid);
274 if (cp == NULL || !cpu_is_online(cp))
275 return (NULL);
276
277 mutex_enter(&ringp->s_ring_lock);
278 ringp->s_ring_state |= S_RING_BOUND;
279 if (ringp->s_ring_cpuid != -1)
280 clear = B_TRUE;
281 ringp->s_ring_cpuid = cpuid;
282 mutex_exit(&ringp->s_ring_lock);
283
284 if (clear)
285 thread_affinity_clear(ringp->s_ring_worker);
286
287 DTRACE_PROBE2(mac__soft__ring__cpu__bound, mac_soft_ring_t *,
288 ringp, processorid_t, cpuid);
289
290 thread_affinity_set(ringp->s_ring_worker, cpuid);
291
292 return (cp);
293 }
294
295 /*
296 * mac_soft_ring_unbind
297 *
298 * Un Bind a soft ring worker thread.
299 */
300 void
301 mac_soft_ring_unbind(mac_soft_ring_t *ringp)
302 {
303 ASSERT(MUTEX_HELD(&cpu_lock));
304
305 mutex_enter(&ringp->s_ring_lock);
306 if (!(ringp->s_ring_state & S_RING_BOUND)) {
307 ASSERT(ringp->s_ring_cpuid == -1);
308 mutex_exit(&ringp->s_ring_lock);
309 return;
310 }
311
312 ringp->s_ring_cpuid = -1;
313 ringp->s_ring_state &= ~S_RING_BOUND;
314 thread_affinity_clear(ringp->s_ring_worker);
315 mutex_exit(&ringp->s_ring_lock);
316 }
317
318 /*
319 * PRIVATE FUNCTIONS
320 */
321
322 static void
323 mac_soft_ring_fire(void *arg)
324 {
325 mac_soft_ring_t *ringp = arg;
326
327 mutex_enter(&ringp->s_ring_lock);
328 if (ringp->s_ring_tid == NULL) {
329 mutex_exit(&ringp->s_ring_lock);
330 return;
331 }
332
333 ringp->s_ring_tid = NULL;
334
335 if (!(ringp->s_ring_state & S_RING_PROC)) {
336 cv_signal(&ringp->s_ring_async);
337 }
338 mutex_exit(&ringp->s_ring_lock);
339 }
340
341 /*
342 * mac_rx_soft_ring_drain
343 *
344 * Called when worker thread model (ST_RING_WORKER_ONLY) of processing
345 * incoming packets is used. s_ring_first contain the queued packets.
346 * s_ring_rx_func contains the upper level (client) routine where the
347 * packets are destined and s_ring_rx_arg1/s_ring_rx_arg2 are the
348 * cookie meant for the client.
349 */
350 /* ARGSUSED */
351 static void
352 mac_rx_soft_ring_drain(mac_soft_ring_t *ringp)
353 {
354 mblk_t *mp;
355 void *arg1;
356 mac_resource_handle_t arg2;
357 timeout_id_t tid;
358 mac_direct_rx_t proc;
359 size_t sz;
360 int cnt;
361 mac_soft_ring_set_t *mac_srs = ringp->s_ring_set;
362
363 ringp->s_ring_run = curthread;
364 ASSERT(mutex_owned(&ringp->s_ring_lock));
365 ASSERT(!(ringp->s_ring_state & S_RING_PROC));
366
367 if ((tid = ringp->s_ring_tid) != NULL)
368 ringp->s_ring_tid = NULL;
369
370 ringp->s_ring_state |= S_RING_PROC;
371
372 proc = ringp->s_ring_rx_func;
373 arg1 = ringp->s_ring_rx_arg1;
374 arg2 = ringp->s_ring_rx_arg2;
375
376 while ((ringp->s_ring_first != NULL) &&
377 !(ringp->s_ring_state & S_RING_PAUSE)) {
378 mp = ringp->s_ring_first;
379 ringp->s_ring_first = NULL;
380 ringp->s_ring_last = NULL;
381 cnt = ringp->s_ring_count;
382 ringp->s_ring_count = 0;
383 sz = ringp->s_ring_size;
384 ringp->s_ring_size = 0;
385 mutex_exit(&ringp->s_ring_lock);
386
387 if (tid != NULL) {
388 (void) untimeout(tid);
389 tid = NULL;
390 }
391
392 (*proc)(arg1, arg2, mp, NULL);
393
394 /*
395 * If we have a soft ring set which is doing
396 * bandwidth control, we need to decrement its
397 * srs_size so it can have a accurate idea of
398 * what is the real data queued between SRS and
399 * its soft rings. We decrement the size for a
400 * packet only when it gets processed by both
401 * SRS and the soft ring.
402 */
403 mutex_enter(&mac_srs->srs_lock);
404 MAC_UPDATE_SRS_COUNT_LOCKED(mac_srs, cnt);
405 MAC_UPDATE_SRS_SIZE_LOCKED(mac_srs, sz);
406 mutex_exit(&mac_srs->srs_lock);
407
408 mutex_enter(&ringp->s_ring_lock);
409 }
410 ringp->s_ring_state &= ~S_RING_PROC;
411 if (ringp->s_ring_state & S_RING_CLIENT_WAIT)
412 cv_signal(&ringp->s_ring_client_cv);
413 ringp->s_ring_run = NULL;
414 }
415
416 /*
417 * mac_soft_ring_worker
418 *
419 * The soft ring worker routine to process any queued packets. In
420 * normal case, the worker thread is bound to a CPU. It the soft
421 * ring is dealing with TCP packets, then the worker thread will
422 * be bound to the same CPU as the TCP squeue.
423 */
424 static void
425 mac_soft_ring_worker(mac_soft_ring_t *ringp)
426 {
427 kmutex_t *lock = &ringp->s_ring_lock;
428 kcondvar_t *async = &ringp->s_ring_async;
429 mac_soft_ring_set_t *srs = ringp->s_ring_set;
430 callb_cpr_t cprinfo;
431
432 CALLB_CPR_INIT(&cprinfo, lock, callb_generic_cpr, "mac_soft_ring");
433 mutex_enter(lock);
434 start:
435 for (;;) {
436 while (((ringp->s_ring_first == NULL ||
437 (ringp->s_ring_state & (S_RING_BLOCK|S_RING_BLANK))) &&
438 !(ringp->s_ring_state & S_RING_PAUSE)) ||
439 (ringp->s_ring_state & S_RING_PROC)) {
440
441 CALLB_CPR_SAFE_BEGIN(&cprinfo);
442 cv_wait(async, lock);
443 CALLB_CPR_SAFE_END(&cprinfo, lock);
444 }
445
446 /*
447 * Either we have work to do, or we have been asked to
448 * shutdown temporarily or permanently
449 */
450 if (ringp->s_ring_state & S_RING_PAUSE)
451 goto done;
452
453 ringp->s_ring_drain_func(ringp);
454 }
455 done:
456 mutex_exit(lock);
457 mutex_enter(&srs->srs_lock);
458 mutex_enter(lock);
459
460 ringp->s_ring_state |= S_RING_QUIESCE_DONE;
461 if (!(ringp->s_ring_state & S_RING_CONDEMNED)) {
462 srs->srs_soft_ring_quiesced_count++;
463 cv_broadcast(&srs->srs_async);
464 mutex_exit(&srs->srs_lock);
465 while (!(ringp->s_ring_state &
466 (S_RING_RESTART | S_RING_CONDEMNED)))
467 cv_wait(&ringp->s_ring_async, &ringp->s_ring_lock);
468 mutex_exit(lock);
469 mutex_enter(&srs->srs_lock);
470 mutex_enter(lock);
471 srs->srs_soft_ring_quiesced_count--;
472 if (ringp->s_ring_state & S_RING_RESTART) {
473 ASSERT(!(ringp->s_ring_state & S_RING_CONDEMNED));
474 ringp->s_ring_state &= ~(S_RING_RESTART |
475 S_RING_QUIESCE | S_RING_QUIESCE_DONE);
476 cv_broadcast(&srs->srs_async);
477 mutex_exit(&srs->srs_lock);
478 goto start;
479 }
480 }
481 ASSERT(ringp->s_ring_state & S_RING_CONDEMNED);
482 ringp->s_ring_state |= S_RING_CONDEMNED_DONE;
483 CALLB_CPR_EXIT(&cprinfo);
484 srs->srs_soft_ring_condemned_count++;
485 cv_broadcast(&srs->srs_async);
486 mutex_exit(&srs->srs_lock);
487 thread_exit();
488 }
489
490 /*
491 * mac_soft_ring_intr_enable and mac_soft_ring_intr_disable
492 *
493 * these functions are called to toggle the sending of packets to the
494 * client. They are called by the client. the client gets the name
495 * of these routine and corresponding cookie (pointing to softring)
496 * during capability negotiation at setup time.
497 *
498 * Enabling is allow the processing thread to send packets to the
499 * client while disabling does the opposite.
500 */
501 int
502 mac_soft_ring_intr_enable(void *arg)
503 {
504 mac_soft_ring_t *ringp = (mac_soft_ring_t *)arg;
505 mutex_enter(&ringp->s_ring_lock);
506 ringp->s_ring_state &= ~S_RING_BLANK;
507 if (ringp->s_ring_first != NULL)
508 mac_soft_ring_worker_wakeup(ringp);
509 mutex_exit(&ringp->s_ring_lock);
510 return (0);
511 }
512
513 boolean_t
514 mac_soft_ring_intr_disable(void *arg)
515 {
516 mac_soft_ring_t *ringp = (mac_soft_ring_t *)arg;
517 boolean_t sring_blanked = B_FALSE;
518 /*
519 * Stop worker thread from sending packets above.
520 * Squeue will poll soft ring when it needs packets.
521 */
522 mutex_enter(&ringp->s_ring_lock);
523 if (!(ringp->s_ring_state & S_RING_PROC)) {
524 ringp->s_ring_state |= S_RING_BLANK;
525 sring_blanked = B_TRUE;
526 }
527 mutex_exit(&ringp->s_ring_lock);
528 return (sring_blanked);
529 }
530
531 /*
532 * mac_soft_ring_poll
533 *
534 * This routine is called by the client to poll for packets from
535 * the soft ring. The function name and cookie corresponding to
536 * the soft ring is exchanged during capability negotiation during
537 * setup.
538 */
539 mblk_t *
540 mac_soft_ring_poll(mac_soft_ring_t *ringp, size_t bytes_to_pickup)
541 {
542 mblk_t *head, *tail;
543 mblk_t *mp;
544 size_t sz = 0;
545 int cnt = 0;
546 mac_soft_ring_set_t *mac_srs = ringp->s_ring_set;
547
548 ASSERT(mac_srs != NULL);
549
550 mutex_enter(&ringp->s_ring_lock);
551 head = tail = mp = ringp->s_ring_first;
552 if (head == NULL) {
553 mutex_exit(&ringp->s_ring_lock);
554 return (NULL);
555 }
556
557 if (ringp->s_ring_size <= bytes_to_pickup) {
558 head = ringp->s_ring_first;
559 ringp->s_ring_first = NULL;
560 ringp->s_ring_last = NULL;
561 cnt = ringp->s_ring_count;
562 ringp->s_ring_count = 0;
563 sz = ringp->s_ring_size;
564 ringp->s_ring_size = 0;
565 } else {
566 while (mp && sz <= bytes_to_pickup) {
567 sz += msgdsize(mp);
568 cnt++;
569 tail = mp;
570 mp = mp->b_next;
571 }
572 ringp->s_ring_count -= cnt;
573 ringp->s_ring_size -= sz;
574 tail->b_next = NULL;
575 if (mp == NULL) {
576 ringp->s_ring_first = NULL;
577 ringp->s_ring_last = NULL;
578 ASSERT(ringp->s_ring_count == 0);
579 } else {
580 ringp->s_ring_first = mp;
581 }
582 }
583
584 mutex_exit(&ringp->s_ring_lock);
585 /*
586 * Update the shared count and size counters so
587 * that SRS has a accurate idea of queued packets.
588 */
589 mutex_enter(&mac_srs->srs_lock);
590 MAC_UPDATE_SRS_COUNT_LOCKED(mac_srs, cnt);
591 MAC_UPDATE_SRS_SIZE_LOCKED(mac_srs, sz);
592 mutex_exit(&mac_srs->srs_lock);
593 return (head);
594 }
595
596 /*
597 * mac_soft_ring_dls_bypass
598 *
599 * Enable direct client (IP) callback function from the softrings.
600 * Callers need to make sure they don't need any DLS layer processing
601 */
602 void
603 mac_soft_ring_dls_bypass(void *arg, mac_direct_rx_t rx_func, void *rx_arg1)
604 {
605 mac_soft_ring_t *softring = arg;
606 mac_soft_ring_set_t *srs;
607
608 ASSERT(rx_func != NULL);
609
610 mutex_enter(&softring->s_ring_lock);
611 softring->s_ring_rx_func = rx_func;
612 softring->s_ring_rx_arg1 = rx_arg1;
613 mutex_exit(&softring->s_ring_lock);
614
615 srs = softring->s_ring_set;
616 mutex_enter(&srs->srs_lock);
617 srs->srs_type |= SRST_DLS_BYPASS;
618 mutex_exit(&srs->srs_lock);
619 }
620
621 /*
622 * mac_soft_ring_signal
623 *
624 * Typically used to set the soft ring state to QUIESCE, CONDEMNED, or
625 * RESTART.
626 *
627 * In the Rx side, the quiescing is done bottom up. After the Rx upcalls
628 * from the driver are done, then the Rx SRS is quiesced and only then can
629 * we signal the soft rings. Thus this function can't be called arbitrarily
630 * without satisfying the prerequisites. On the Tx side, the threads from
631 * top need to quiesced, then the Tx SRS and only then can we signal the
632 * Tx soft rings.
633 */
634 void
635 mac_soft_ring_signal(mac_soft_ring_t *softring, uint_t sr_flag)
636 {
637 mutex_enter(&softring->s_ring_lock);
638 softring->s_ring_state |= sr_flag;
639 cv_signal(&softring->s_ring_async);
640 mutex_exit(&softring->s_ring_lock);
641 }
642
643 /*
644 * mac_tx_soft_ring_drain
645 *
646 * The transmit side drain routine in case the soft ring was being
647 * used to transmit packets.
648 */
649 static void
650 mac_tx_soft_ring_drain(mac_soft_ring_t *ringp)
651 {
652 mblk_t *mp;
653 void *arg1;
654 void *arg2;
655 mblk_t *tail;
656 uint_t saved_pkt_count, saved_size;
657 mac_tx_stats_t stats;
658 mac_soft_ring_set_t *mac_srs = ringp->s_ring_set;
659
660 saved_pkt_count = saved_size = 0;
661 ringp->s_ring_run = curthread;
662 ASSERT(mutex_owned(&ringp->s_ring_lock));
663 ASSERT(!(ringp->s_ring_state & S_RING_PROC));
664
665 ringp->s_ring_state |= S_RING_PROC;
666 arg1 = ringp->s_ring_tx_arg1;
667 arg2 = ringp->s_ring_tx_arg2;
668
669 while (ringp->s_ring_first != NULL) {
670 mp = ringp->s_ring_first;
671 tail = ringp->s_ring_last;
672 saved_pkt_count = ringp->s_ring_count;
673 saved_size = ringp->s_ring_size;
674 ringp->s_ring_first = NULL;
675 ringp->s_ring_last = NULL;
676 ringp->s_ring_count = 0;
677 ringp->s_ring_size = 0;
678 mutex_exit(&ringp->s_ring_lock);
679
680 mp = mac_tx_send(arg1, arg2, mp, &stats);
681
682 mutex_enter(&ringp->s_ring_lock);
683 if (mp != NULL) {
684 /* Device out of tx desc, set block */
685 tail->b_next = ringp->s_ring_first;
686 ringp->s_ring_first = mp;
687 ringp->s_ring_count +=
688 (saved_pkt_count - stats.mts_opackets);
689 ringp->s_ring_size += (saved_size - stats.mts_obytes);
690 if (ringp->s_ring_last == NULL)
691 ringp->s_ring_last = tail;
692
693 if (ringp->s_ring_tx_woken_up) {
694 ringp->s_ring_tx_woken_up = B_FALSE;
695 } else {
696 ringp->s_ring_state |= S_RING_BLOCK;
697 ringp->s_st_stat.mts_blockcnt++;
698 }
699
700 ringp->s_ring_state &= ~S_RING_PROC;
701 ringp->s_ring_run = NULL;
702 return;
703 } else {
704 ringp->s_ring_tx_woken_up = B_FALSE;
705 SRS_TX_STATS_UPDATE(mac_srs, &stats);
706 SOFTRING_TX_STATS_UPDATE(ringp, &stats);
707 }
708 }
709
710 if (ringp->s_ring_count == 0 && ringp->s_ring_state &
711 (S_RING_TX_HIWAT | S_RING_WAKEUP_CLIENT | S_RING_ENQUEUED)) {
712 mac_client_impl_t *mcip = ringp->s_ring_mcip;
713 boolean_t wakeup_required = B_FALSE;
714
715 if (ringp->s_ring_state &
716 (S_RING_TX_HIWAT|S_RING_WAKEUP_CLIENT)) {
717 wakeup_required = B_TRUE;
718 }
719 ringp->s_ring_state &=
720 ~(S_RING_TX_HIWAT | S_RING_WAKEUP_CLIENT | S_RING_ENQUEUED);
721 mutex_exit(&ringp->s_ring_lock);
722 if (wakeup_required) {
723 mac_tx_invoke_callbacks(mcip, (mac_tx_cookie_t)ringp);
724 /*
725 * If the client is not the primary MAC client, then we
726 * need to send the notification to the clients upper
727 * MAC, i.e. mci_upper_mip.
728 */
729 mac_tx_notify(mcip->mci_upper_mip != NULL ?
730 mcip->mci_upper_mip : mcip->mci_mip);
731 }
732 mutex_enter(&ringp->s_ring_lock);
733 }
734 ringp->s_ring_state &= ~S_RING_PROC;
735 ringp->s_ring_run = NULL;
736 }