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1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2012, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36 
37 #define DEBUG_SUBSYSTEM S_RPC
38 
39 #include "../../include/linux/libcfs/libcfs.h"
40 # ifdef __mips64__
41 #  include <linux/kernel.h>
42 # endif
43 
44 #include "../include/obd_class.h"
45 #include "../include/lustre_net.h"
46 #include "../include/lustre_sec.h"
47 #include "ptlrpc_internal.h"
48 
49 lnet_handle_eq_t   ptlrpc_eq_h;
50 
51 /*
52  *  Client's outgoing request callback
53  */
request_out_callback(lnet_event_t * ev)54 void request_out_callback(lnet_event_t *ev)
55 {
56 	struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
57 	struct ptlrpc_request *req = cbid->cbid_arg;
58 
59 	LASSERT(ev->type == LNET_EVENT_SEND ||
60 		ev->type == LNET_EVENT_UNLINK);
61 	LASSERT(ev->unlinked);
62 
63 	DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
64 
65 	sptlrpc_request_out_callback(req);
66 	spin_lock(&req->rq_lock);
67 	req->rq_real_sent = ktime_get_real_seconds();
68 	if (ev->unlinked)
69 		req->rq_req_unlink = 0;
70 
71 	if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) {
72 
73 		/* Failed send: make it seem like the reply timed out, just
74 		 * like failing sends in client.c does currently...  */
75 
76 		req->rq_net_err = 1;
77 		ptlrpc_client_wake_req(req);
78 	}
79 	spin_unlock(&req->rq_lock);
80 
81 	ptlrpc_req_finished(req);
82 }
83 
84 /*
85  * Client's incoming reply callback
86  */
reply_in_callback(lnet_event_t * ev)87 void reply_in_callback(lnet_event_t *ev)
88 {
89 	struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
90 	struct ptlrpc_request *req = cbid->cbid_arg;
91 
92 	DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status);
93 
94 	LASSERT(ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK);
95 	LASSERT(ev->md.start == req->rq_repbuf);
96 	LASSERT(ev->offset + ev->mlength <= req->rq_repbuf_len);
97 	/* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests
98 	   for adaptive timeouts' early reply. */
99 	LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0);
100 
101 	spin_lock(&req->rq_lock);
102 
103 	req->rq_receiving_reply = 0;
104 	req->rq_early = 0;
105 	if (ev->unlinked)
106 		req->rq_reply_unlink = 0;
107 
108 	if (ev->status)
109 		goto out_wake;
110 
111 	if (ev->type == LNET_EVENT_UNLINK) {
112 		LASSERT(ev->unlinked);
113 		DEBUG_REQ(D_NET, req, "unlink");
114 		goto out_wake;
115 	}
116 
117 	if (ev->mlength < ev->rlength) {
118 		CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req,
119 		       req->rq_replen, ev->rlength, ev->offset);
120 		req->rq_reply_truncate = 1;
121 		req->rq_replied = 1;
122 		req->rq_status = -EOVERFLOW;
123 		req->rq_nob_received = ev->rlength + ev->offset;
124 		goto out_wake;
125 	}
126 
127 	if ((ev->offset == 0) &&
128 	    ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) {
129 		/* Early reply */
130 		DEBUG_REQ(D_ADAPTTO, req,
131 			  "Early reply received: mlen=%u offset=%d replen=%d replied=%d unlinked=%d",
132 			  ev->mlength, ev->offset,
133 			  req->rq_replen, req->rq_replied, ev->unlinked);
134 
135 		req->rq_early_count++; /* number received, client side */
136 
137 		if (req->rq_replied)   /* already got the real reply */
138 			goto out_wake;
139 
140 		req->rq_early = 1;
141 		req->rq_reply_off = ev->offset;
142 		req->rq_nob_received = ev->mlength;
143 		/* And we're still receiving */
144 		req->rq_receiving_reply = 1;
145 	} else {
146 		/* Real reply */
147 		req->rq_rep_swab_mask = 0;
148 		req->rq_replied = 1;
149 		/* Got reply, no resend required */
150 		req->rq_resend = 0;
151 		req->rq_reply_off = ev->offset;
152 		req->rq_nob_received = ev->mlength;
153 		/* LNetMDUnlink can't be called under the LNET_LOCK,
154 		   so we must unlink in ptlrpc_unregister_reply */
155 		DEBUG_REQ(D_INFO, req,
156 			  "reply in flags=%x mlen=%u offset=%d replen=%d",
157 			  lustre_msg_get_flags(req->rq_reqmsg),
158 			  ev->mlength, ev->offset, req->rq_replen);
159 	}
160 
161 	req->rq_import->imp_last_reply_time = ktime_get_real_seconds();
162 
163 out_wake:
164 	/* NB don't unlock till after wakeup; req can disappear under us
165 	 * since we don't have our own ref */
166 	ptlrpc_client_wake_req(req);
167 	spin_unlock(&req->rq_lock);
168 }
169 
170 /*
171  * Client's bulk has been written/read
172  */
client_bulk_callback(lnet_event_t * ev)173 void client_bulk_callback(lnet_event_t *ev)
174 {
175 	struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
176 	struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
177 	struct ptlrpc_request *req;
178 
179 	LASSERT((desc->bd_type == BULK_PUT_SINK &&
180 		 ev->type == LNET_EVENT_PUT) ||
181 		(desc->bd_type == BULK_GET_SOURCE &&
182 		 ev->type == LNET_EVENT_GET) ||
183 		ev->type == LNET_EVENT_UNLINK);
184 	LASSERT(ev->unlinked);
185 
186 	if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE))
187 		ev->status = -EIO;
188 
189 	if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2,
190 				 CFS_FAIL_ONCE))
191 		ev->status = -EIO;
192 
193 	CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
194 	       "event type %d, status %d, desc %p\n",
195 	       ev->type, ev->status, desc);
196 
197 	spin_lock(&desc->bd_lock);
198 	req = desc->bd_req;
199 	LASSERT(desc->bd_md_count > 0);
200 	desc->bd_md_count--;
201 
202 	if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) {
203 		desc->bd_nob_transferred += ev->mlength;
204 		desc->bd_sender = ev->sender;
205 	} else {
206 		/* start reconnect and resend if network error hit */
207 		spin_lock(&req->rq_lock);
208 		req->rq_net_err = 1;
209 		spin_unlock(&req->rq_lock);
210 	}
211 
212 	if (ev->status != 0)
213 		desc->bd_failure = 1;
214 
215 	/* NB don't unlock till after wakeup; desc can disappear under us
216 	 * otherwise */
217 	if (desc->bd_md_count == 0)
218 		ptlrpc_client_wake_req(desc->bd_req);
219 
220 	spin_unlock(&desc->bd_lock);
221 }
222 
223 /*
224  * We will have percpt request history list for ptlrpc service in upcoming
225  * patches because we don't want to be serialized by current per-service
226  * history operations. So we require history ID can (somehow) show arriving
227  * order w/o grabbing global lock, and user can sort them in userspace.
228  *
229  * This is how we generate history ID for ptlrpc_request:
230  * ----------------------------------------------------
231  * |  32 bits  |  16 bits  | (16 - X)bits  |  X bits  |
232  * ----------------------------------------------------
233  * |  seconds  | usec / 16 |   sequence    | CPT id   |
234  * ----------------------------------------------------
235  *
236  * it might not be precise but should be good enough.
237  */
238 
239 #define REQS_CPT_BITS(svcpt)	((svcpt)->scp_service->srv_cpt_bits)
240 
241 #define REQS_SEC_SHIFT		32
242 #define REQS_USEC_SHIFT		16
243 #define REQS_SEQ_SHIFT(svcpt)	REQS_CPT_BITS(svcpt)
244 
ptlrpc_req_add_history(struct ptlrpc_service_part * svcpt,struct ptlrpc_request * req)245 static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt,
246 				   struct ptlrpc_request *req)
247 {
248 	__u64 sec = req->rq_arrival_time.tv_sec;
249 	__u32 usec = req->rq_arrival_time.tv_nsec / NSEC_PER_USEC / 16; /* usec / 16 */
250 	__u64 new_seq;
251 
252 	/* set sequence ID for request and add it to history list,
253 	 * it must be called with hold svcpt::scp_lock */
254 
255 	new_seq = (sec << REQS_SEC_SHIFT) |
256 		  (usec << REQS_USEC_SHIFT) |
257 		  (svcpt->scp_cpt < 0 ? 0 : svcpt->scp_cpt);
258 
259 	if (new_seq > svcpt->scp_hist_seq) {
260 		/* This handles the initial case of scp_hist_seq == 0 or
261 		 * we just jumped into a new time window */
262 		svcpt->scp_hist_seq = new_seq;
263 	} else {
264 		LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT);
265 		/* NB: increase sequence number in current usec bucket,
266 		 * however, it's possible that we used up all bits for
267 		 * sequence and jumped into the next usec bucket (future time),
268 		 * then we hope there will be less RPCs per bucket at some
269 		 * point, and sequence will catch up again */
270 		svcpt->scp_hist_seq += (1U << REQS_SEQ_SHIFT(svcpt));
271 		new_seq = svcpt->scp_hist_seq;
272 	}
273 
274 	req->rq_history_seq = new_seq;
275 
276 	list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs);
277 }
278 
279 /*
280  * Server's incoming request callback
281  */
request_in_callback(lnet_event_t * ev)282 void request_in_callback(lnet_event_t *ev)
283 {
284 	struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
285 	struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg;
286 	struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt;
287 	struct ptlrpc_service *service = svcpt->scp_service;
288 	struct ptlrpc_request *req;
289 
290 	LASSERT(ev->type == LNET_EVENT_PUT ||
291 		ev->type == LNET_EVENT_UNLINK);
292 	LASSERT((char *)ev->md.start >= rqbd->rqbd_buffer);
293 	LASSERT((char *)ev->md.start + ev->offset + ev->mlength <=
294 		rqbd->rqbd_buffer + service->srv_buf_size);
295 
296 	CDEBUG((ev->status == 0) ? D_NET : D_ERROR,
297 	       "event type %d, status %d, service %s\n",
298 	       ev->type, ev->status, service->srv_name);
299 
300 	if (ev->unlinked) {
301 		/* If this is the last request message to fit in the
302 		 * request buffer we can use the request object embedded in
303 		 * rqbd.  Note that if we failed to allocate a request,
304 		 * we'd have to re-post the rqbd, which we can't do in this
305 		 * context. */
306 		req = &rqbd->rqbd_req;
307 		memset(req, 0, sizeof(*req));
308 	} else {
309 		LASSERT(ev->type == LNET_EVENT_PUT);
310 		if (ev->status != 0) {
311 			/* We moaned above already... */
312 			return;
313 		}
314 		req = ptlrpc_request_cache_alloc(GFP_ATOMIC);
315 		if (req == NULL) {
316 			CERROR("Can't allocate incoming request descriptor: Dropping %s RPC from %s\n",
317 			       service->srv_name,
318 			       libcfs_id2str(ev->initiator));
319 			return;
320 		}
321 	}
322 
323 	/* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL,
324 	 * flags are reset and scalars are zero.  We only set the message
325 	 * size to non-zero if this was a successful receive. */
326 	req->rq_xid = ev->match_bits;
327 	req->rq_reqbuf = ev->md.start + ev->offset;
328 	if (ev->type == LNET_EVENT_PUT && ev->status == 0)
329 		req->rq_reqdata_len = ev->mlength;
330 	ktime_get_real_ts64(&req->rq_arrival_time);
331 	req->rq_peer = ev->initiator;
332 	req->rq_self = ev->target.nid;
333 	req->rq_rqbd = rqbd;
334 	req->rq_phase = RQ_PHASE_NEW;
335 	spin_lock_init(&req->rq_lock);
336 	INIT_LIST_HEAD(&req->rq_timed_list);
337 	INIT_LIST_HEAD(&req->rq_exp_list);
338 	atomic_set(&req->rq_refcount, 1);
339 	if (ev->type == LNET_EVENT_PUT)
340 		CDEBUG(D_INFO, "incoming req@%p x%llu msgsize %u\n",
341 		       req, req->rq_xid, ev->mlength);
342 
343 	CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer));
344 
345 	spin_lock(&svcpt->scp_lock);
346 
347 	ptlrpc_req_add_history(svcpt, req);
348 
349 	if (ev->unlinked) {
350 		svcpt->scp_nrqbds_posted--;
351 		CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n",
352 		       svcpt->scp_nrqbds_posted);
353 
354 		/* Normally, don't complain about 0 buffers posted; LNET won't
355 		 * drop incoming reqs since we set the portal lazy */
356 		if (test_req_buffer_pressure &&
357 		    ev->type != LNET_EVENT_UNLINK &&
358 		    svcpt->scp_nrqbds_posted == 0)
359 			CWARN("All %s request buffers busy\n",
360 			      service->srv_name);
361 
362 		/* req takes over the network's ref on rqbd */
363 	} else {
364 		/* req takes a ref on rqbd */
365 		rqbd->rqbd_refcount++;
366 	}
367 
368 	list_add_tail(&req->rq_list, &svcpt->scp_req_incoming);
369 	svcpt->scp_nreqs_incoming++;
370 
371 	/* NB everything can disappear under us once the request
372 	 * has been queued and we unlock, so do the wake now... */
373 	wake_up(&svcpt->scp_waitq);
374 
375 	spin_unlock(&svcpt->scp_lock);
376 }
377 
378 /*
379  *  Server's outgoing reply callback
380  */
reply_out_callback(lnet_event_t * ev)381 void reply_out_callback(lnet_event_t *ev)
382 {
383 	struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
384 	struct ptlrpc_reply_state *rs = cbid->cbid_arg;
385 	struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
386 
387 	LASSERT(ev->type == LNET_EVENT_SEND ||
388 		ev->type == LNET_EVENT_ACK ||
389 		ev->type == LNET_EVENT_UNLINK);
390 
391 	if (!rs->rs_difficult) {
392 		/* 'Easy' replies have no further processing so I drop the
393 		 * net's ref on 'rs' */
394 		LASSERT(ev->unlinked);
395 		ptlrpc_rs_decref(rs);
396 		return;
397 	}
398 
399 	LASSERT(rs->rs_on_net);
400 
401 	if (ev->unlinked) {
402 		/* Last network callback. The net's ref on 'rs' stays put
403 		 * until ptlrpc_handle_rs() is done with it */
404 		spin_lock(&svcpt->scp_rep_lock);
405 		spin_lock(&rs->rs_lock);
406 
407 		rs->rs_on_net = 0;
408 		if (!rs->rs_no_ack ||
409 		    rs->rs_transno <=
410 		    rs->rs_export->exp_obd->obd_last_committed)
411 			ptlrpc_schedule_difficult_reply(rs);
412 
413 		spin_unlock(&rs->rs_lock);
414 		spin_unlock(&svcpt->scp_rep_lock);
415 	}
416 }
417 
ptlrpc_master_callback(lnet_event_t * ev)418 static void ptlrpc_master_callback(lnet_event_t *ev)
419 {
420 	struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
421 	void (*callback)(lnet_event_t *ev) = cbid->cbid_fn;
422 
423 	/* Honestly, it's best to find out early. */
424 	LASSERT(cbid->cbid_arg != LP_POISON);
425 	LASSERT(callback == request_out_callback ||
426 		callback == reply_in_callback ||
427 		callback == client_bulk_callback ||
428 		callback == request_in_callback ||
429 		callback == reply_out_callback);
430 
431 	callback(ev);
432 }
433 
ptlrpc_uuid_to_peer(struct obd_uuid * uuid,lnet_process_id_t * peer,lnet_nid_t * self)434 int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
435 			lnet_process_id_t *peer, lnet_nid_t *self)
436 {
437 	int best_dist = 0;
438 	__u32 best_order = 0;
439 	int count = 0;
440 	int rc = -ENOENT;
441 	int portals_compatibility;
442 	int dist;
443 	__u32 order;
444 	lnet_nid_t dst_nid;
445 	lnet_nid_t src_nid;
446 
447 	portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
448 
449 	peer->pid = LUSTRE_SRV_LNET_PID;
450 
451 	/* Choose the matching UUID that's closest */
452 	while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) {
453 		dist = LNetDist(dst_nid, &src_nid, &order);
454 		if (dist < 0)
455 			continue;
456 
457 		if (dist == 0) {		/* local! use loopback LND */
458 			peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0);
459 			rc = 0;
460 			break;
461 		}
462 
463 		if (rc < 0 ||
464 		    dist < best_dist ||
465 		    (dist == best_dist && order < best_order)) {
466 			best_dist = dist;
467 			best_order = order;
468 
469 			if (portals_compatibility > 1) {
470 				/* Strong portals compatibility: Zero the nid's
471 				 * NET, so if I'm reading new config logs, or
472 				 * getting configured by (new) lconf I can
473 				 * still talk to old servers. */
474 				dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
475 				src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
476 			}
477 			peer->nid = dst_nid;
478 			*self = src_nid;
479 			rc = 0;
480 		}
481 	}
482 
483 	CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
484 	return rc;
485 }
486 
ptlrpc_ni_fini(void)487 static void ptlrpc_ni_fini(void)
488 {
489 	wait_queue_head_t waitq;
490 	struct l_wait_info lwi;
491 	int rc;
492 	int retries;
493 
494 	/* Wait for the event queue to become idle since there may still be
495 	 * messages in flight with pending events (i.e. the fire-and-forget
496 	 * messages == client requests and "non-difficult" server
497 	 * replies */
498 
499 	for (retries = 0;; retries++) {
500 		rc = LNetEQFree(ptlrpc_eq_h);
501 		switch (rc) {
502 		default:
503 			LBUG();
504 
505 		case 0:
506 			LNetNIFini();
507 			return;
508 
509 		case -EBUSY:
510 			if (retries != 0)
511 				CWARN("Event queue still busy\n");
512 
513 			/* Wait for a bit */
514 			init_waitqueue_head(&waitq);
515 			lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
516 			l_wait_event(waitq, 0, &lwi);
517 			break;
518 		}
519 	}
520 	/* notreached */
521 }
522 
ptl_get_pid(void)523 static lnet_pid_t ptl_get_pid(void)
524 {
525 	lnet_pid_t pid;
526 
527 	pid = LUSTRE_SRV_LNET_PID;
528 	return pid;
529 }
530 
ptlrpc_ni_init(void)531 static int ptlrpc_ni_init(void)
532 {
533 	int rc;
534 	lnet_pid_t pid;
535 
536 	pid = ptl_get_pid();
537 	CDEBUG(D_NET, "My pid is: %x\n", pid);
538 
539 	/* We're not passing any limits yet... */
540 	rc = LNetNIInit(pid);
541 	if (rc < 0) {
542 		CDEBUG(D_NET, "Can't init network interface: %d\n", rc);
543 		return -ENOENT;
544 	}
545 
546 	/* CAVEAT EMPTOR: how we process portals events is _radically_
547 	 * different depending on... */
548 	/* kernel LNet calls our master callback when there are new event,
549 	 * because we are guaranteed to get every event via callback,
550 	 * so we just set EQ size to 0 to avoid overhead of serializing
551 	 * enqueue/dequeue operations in LNet. */
552 	rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h);
553 	if (rc == 0)
554 		return 0;
555 
556 	CERROR("Failed to allocate event queue: %d\n", rc);
557 	LNetNIFini();
558 
559 	return -ENOMEM;
560 }
561 
ptlrpc_init_portals(void)562 int ptlrpc_init_portals(void)
563 {
564 	int rc = ptlrpc_ni_init();
565 
566 	if (rc != 0) {
567 		CERROR("network initialisation failed\n");
568 		return -EIO;
569 	}
570 	rc = ptlrpcd_addref();
571 	if (rc == 0)
572 		return 0;
573 
574 	CERROR("rpcd initialisation failed\n");
575 	ptlrpc_ni_fini();
576 	return rc;
577 }
578 
ptlrpc_exit_portals(void)579 void ptlrpc_exit_portals(void)
580 {
581 	ptlrpcd_decref();
582 	ptlrpc_ni_fini();
583 }
584