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d7e09d03 PT |
1 | /* |
2 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. | |
3 | * | |
4 | * Copyright (c) 2011, 2012, Intel Corporation. | |
5 | * | |
6 | * Author: Zach Brown <zab@zabbo.net> | |
7 | * Author: Peter J. Braam <braam@clusterfs.com> | |
8 | * Author: Phil Schwan <phil@clusterfs.com> | |
9 | * Author: Eric Barton <eric@bartonsoftware.com> | |
10 | * | |
11 | * This file is part of Portals, http://www.sf.net/projects/sandiaportals/ | |
12 | * | |
13 | * Portals is free software; you can redistribute it and/or | |
14 | * modify it under the terms of version 2 of the GNU General Public | |
15 | * License as published by the Free Software Foundation. | |
16 | * | |
17 | * Portals is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with Portals; if not, write to the Free Software | |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
27 | #include "socklnd.h" | |
28 | ||
29 | ksock_tx_t * | |
30 | ksocknal_alloc_tx(int type, int size) | |
31 | { | |
32 | ksock_tx_t *tx = NULL; | |
33 | ||
34 | if (type == KSOCK_MSG_NOOP) { | |
35 | LASSERT(size == KSOCK_NOOP_TX_SIZE); | |
36 | ||
37 | /* searching for a noop tx in free list */ | |
38 | spin_lock(&ksocknal_data.ksnd_tx_lock); | |
39 | ||
40 | if (!list_empty(&ksocknal_data.ksnd_idle_noop_txs)) { | |
41 | tx = list_entry(ksocknal_data.ksnd_idle_noop_txs. \ | |
42 | next, ksock_tx_t, tx_list); | |
43 | LASSERT(tx->tx_desc_size == size); | |
44 | list_del(&tx->tx_list); | |
45 | } | |
46 | ||
47 | spin_unlock(&ksocknal_data.ksnd_tx_lock); | |
48 | } | |
49 | ||
50 | if (tx == NULL) | |
51 | LIBCFS_ALLOC(tx, size); | |
52 | ||
53 | if (tx == NULL) | |
54 | return NULL; | |
55 | ||
56 | atomic_set(&tx->tx_refcount, 1); | |
57 | tx->tx_zc_aborted = 0; | |
58 | tx->tx_zc_capable = 0; | |
59 | tx->tx_zc_checked = 0; | |
60 | tx->tx_desc_size = size; | |
61 | ||
62 | atomic_inc(&ksocknal_data.ksnd_nactive_txs); | |
63 | ||
64 | return tx; | |
65 | } | |
66 | ||
67 | ksock_tx_t * | |
68 | ksocknal_alloc_tx_noop(__u64 cookie, int nonblk) | |
69 | { | |
70 | ksock_tx_t *tx; | |
71 | ||
72 | tx = ksocknal_alloc_tx(KSOCK_MSG_NOOP, KSOCK_NOOP_TX_SIZE); | |
73 | if (tx == NULL) { | |
74 | CERROR("Can't allocate noop tx desc\n"); | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | tx->tx_conn = NULL; | |
79 | tx->tx_lnetmsg = NULL; | |
80 | tx->tx_kiov = NULL; | |
81 | tx->tx_nkiov = 0; | |
82 | tx->tx_iov = tx->tx_frags.virt.iov; | |
83 | tx->tx_niov = 1; | |
84 | tx->tx_nonblk = nonblk; | |
85 | ||
86 | socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_NOOP); | |
87 | tx->tx_msg.ksm_zc_cookies[1] = cookie; | |
88 | ||
89 | return tx; | |
90 | } | |
91 | ||
92 | ||
93 | void | |
94 | ksocknal_free_tx (ksock_tx_t *tx) | |
95 | { | |
96 | atomic_dec(&ksocknal_data.ksnd_nactive_txs); | |
97 | ||
98 | if (tx->tx_lnetmsg == NULL && tx->tx_desc_size == KSOCK_NOOP_TX_SIZE) { | |
99 | /* it's a noop tx */ | |
100 | spin_lock(&ksocknal_data.ksnd_tx_lock); | |
101 | ||
102 | list_add(&tx->tx_list, &ksocknal_data.ksnd_idle_noop_txs); | |
103 | ||
104 | spin_unlock(&ksocknal_data.ksnd_tx_lock); | |
105 | } else { | |
106 | LIBCFS_FREE(tx, tx->tx_desc_size); | |
107 | } | |
108 | } | |
109 | ||
110 | int | |
111 | ksocknal_send_iov (ksock_conn_t *conn, ksock_tx_t *tx) | |
112 | { | |
113 | struct iovec *iov = tx->tx_iov; | |
114 | int nob; | |
115 | int rc; | |
116 | ||
117 | LASSERT (tx->tx_niov > 0); | |
118 | ||
119 | /* Never touch tx->tx_iov inside ksocknal_lib_send_iov() */ | |
120 | rc = ksocknal_lib_send_iov(conn, tx); | |
121 | ||
122 | if (rc <= 0) /* sent nothing? */ | |
123 | return (rc); | |
124 | ||
125 | nob = rc; | |
126 | LASSERT (nob <= tx->tx_resid); | |
127 | tx->tx_resid -= nob; | |
128 | ||
129 | /* "consume" iov */ | |
130 | do { | |
131 | LASSERT (tx->tx_niov > 0); | |
132 | ||
133 | if (nob < (int) iov->iov_len) { | |
134 | iov->iov_base = (void *)((char *)iov->iov_base + nob); | |
135 | iov->iov_len -= nob; | |
136 | return (rc); | |
137 | } | |
138 | ||
139 | nob -= iov->iov_len; | |
140 | tx->tx_iov = ++iov; | |
141 | tx->tx_niov--; | |
142 | } while (nob != 0); | |
143 | ||
144 | return (rc); | |
145 | } | |
146 | ||
147 | int | |
148 | ksocknal_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx) | |
149 | { | |
150 | lnet_kiov_t *kiov = tx->tx_kiov; | |
151 | int nob; | |
152 | int rc; | |
153 | ||
154 | LASSERT (tx->tx_niov == 0); | |
155 | LASSERT (tx->tx_nkiov > 0); | |
156 | ||
157 | /* Never touch tx->tx_kiov inside ksocknal_lib_send_kiov() */ | |
158 | rc = ksocknal_lib_send_kiov(conn, tx); | |
159 | ||
160 | if (rc <= 0) /* sent nothing? */ | |
161 | return (rc); | |
162 | ||
163 | nob = rc; | |
164 | LASSERT (nob <= tx->tx_resid); | |
165 | tx->tx_resid -= nob; | |
166 | ||
167 | /* "consume" kiov */ | |
168 | do { | |
169 | LASSERT(tx->tx_nkiov > 0); | |
170 | ||
171 | if (nob < (int)kiov->kiov_len) { | |
172 | kiov->kiov_offset += nob; | |
173 | kiov->kiov_len -= nob; | |
174 | return rc; | |
175 | } | |
176 | ||
177 | nob -= (int)kiov->kiov_len; | |
178 | tx->tx_kiov = ++kiov; | |
179 | tx->tx_nkiov--; | |
180 | } while (nob != 0); | |
181 | ||
182 | return (rc); | |
183 | } | |
184 | ||
185 | int | |
186 | ksocknal_transmit (ksock_conn_t *conn, ksock_tx_t *tx) | |
187 | { | |
188 | int rc; | |
189 | int bufnob; | |
190 | ||
191 | if (ksocknal_data.ksnd_stall_tx != 0) { | |
192 | cfs_pause(cfs_time_seconds(ksocknal_data.ksnd_stall_tx)); | |
193 | } | |
194 | ||
195 | LASSERT (tx->tx_resid != 0); | |
196 | ||
197 | rc = ksocknal_connsock_addref(conn); | |
198 | if (rc != 0) { | |
199 | LASSERT (conn->ksnc_closing); | |
200 | return (-ESHUTDOWN); | |
201 | } | |
202 | ||
203 | do { | |
204 | if (ksocknal_data.ksnd_enomem_tx > 0) { | |
205 | /* testing... */ | |
206 | ksocknal_data.ksnd_enomem_tx--; | |
207 | rc = -EAGAIN; | |
208 | } else if (tx->tx_niov != 0) { | |
209 | rc = ksocknal_send_iov (conn, tx); | |
210 | } else { | |
211 | rc = ksocknal_send_kiov (conn, tx); | |
212 | } | |
213 | ||
214 | bufnob = cfs_sock_wmem_queued(conn->ksnc_sock); | |
215 | if (rc > 0) /* sent something? */ | |
216 | conn->ksnc_tx_bufnob += rc; /* account it */ | |
217 | ||
218 | if (bufnob < conn->ksnc_tx_bufnob) { | |
219 | /* allocated send buffer bytes < computed; infer | |
220 | * something got ACKed */ | |
221 | conn->ksnc_tx_deadline = | |
222 | cfs_time_shift(*ksocknal_tunables.ksnd_timeout); | |
223 | conn->ksnc_peer->ksnp_last_alive = cfs_time_current(); | |
224 | conn->ksnc_tx_bufnob = bufnob; | |
225 | mb(); | |
226 | } | |
227 | ||
228 | if (rc <= 0) { /* Didn't write anything? */ | |
229 | ||
230 | if (rc == 0) /* some stacks return 0 instead of -EAGAIN */ | |
231 | rc = -EAGAIN; | |
232 | ||
233 | /* Check if EAGAIN is due to memory pressure */ | |
234 | if(rc == -EAGAIN && ksocknal_lib_memory_pressure(conn)) | |
235 | rc = -ENOMEM; | |
236 | ||
237 | break; | |
238 | } | |
239 | ||
240 | /* socket's wmem_queued now includes 'rc' bytes */ | |
241 | atomic_sub (rc, &conn->ksnc_tx_nob); | |
242 | rc = 0; | |
243 | ||
244 | } while (tx->tx_resid != 0); | |
245 | ||
246 | ksocknal_connsock_decref(conn); | |
247 | return (rc); | |
248 | } | |
249 | ||
250 | int | |
251 | ksocknal_recv_iov (ksock_conn_t *conn) | |
252 | { | |
253 | struct iovec *iov = conn->ksnc_rx_iov; | |
254 | int nob; | |
255 | int rc; | |
256 | ||
257 | LASSERT (conn->ksnc_rx_niov > 0); | |
258 | ||
259 | /* Never touch conn->ksnc_rx_iov or change connection | |
260 | * status inside ksocknal_lib_recv_iov */ | |
261 | rc = ksocknal_lib_recv_iov(conn); | |
262 | ||
263 | if (rc <= 0) | |
264 | return (rc); | |
265 | ||
266 | /* received something... */ | |
267 | nob = rc; | |
268 | ||
269 | conn->ksnc_peer->ksnp_last_alive = cfs_time_current(); | |
270 | conn->ksnc_rx_deadline = | |
271 | cfs_time_shift(*ksocknal_tunables.ksnd_timeout); | |
272 | mb(); /* order with setting rx_started */ | |
273 | conn->ksnc_rx_started = 1; | |
274 | ||
275 | conn->ksnc_rx_nob_wanted -= nob; | |
276 | conn->ksnc_rx_nob_left -= nob; | |
277 | ||
278 | do { | |
279 | LASSERT (conn->ksnc_rx_niov > 0); | |
280 | ||
281 | if (nob < (int)iov->iov_len) { | |
282 | iov->iov_len -= nob; | |
283 | iov->iov_base = (void *)((char *)iov->iov_base + nob); | |
284 | return (-EAGAIN); | |
285 | } | |
286 | ||
287 | nob -= iov->iov_len; | |
288 | conn->ksnc_rx_iov = ++iov; | |
289 | conn->ksnc_rx_niov--; | |
290 | } while (nob != 0); | |
291 | ||
292 | return (rc); | |
293 | } | |
294 | ||
295 | int | |
296 | ksocknal_recv_kiov (ksock_conn_t *conn) | |
297 | { | |
298 | lnet_kiov_t *kiov = conn->ksnc_rx_kiov; | |
299 | int nob; | |
300 | int rc; | |
301 | LASSERT (conn->ksnc_rx_nkiov > 0); | |
302 | ||
303 | /* Never touch conn->ksnc_rx_kiov or change connection | |
304 | * status inside ksocknal_lib_recv_iov */ | |
305 | rc = ksocknal_lib_recv_kiov(conn); | |
306 | ||
307 | if (rc <= 0) | |
308 | return (rc); | |
309 | ||
310 | /* received something... */ | |
311 | nob = rc; | |
312 | ||
313 | conn->ksnc_peer->ksnp_last_alive = cfs_time_current(); | |
314 | conn->ksnc_rx_deadline = | |
315 | cfs_time_shift(*ksocknal_tunables.ksnd_timeout); | |
316 | mb(); /* order with setting rx_started */ | |
317 | conn->ksnc_rx_started = 1; | |
318 | ||
319 | conn->ksnc_rx_nob_wanted -= nob; | |
320 | conn->ksnc_rx_nob_left -= nob; | |
321 | ||
322 | do { | |
323 | LASSERT (conn->ksnc_rx_nkiov > 0); | |
324 | ||
325 | if (nob < (int) kiov->kiov_len) { | |
326 | kiov->kiov_offset += nob; | |
327 | kiov->kiov_len -= nob; | |
328 | return -EAGAIN; | |
329 | } | |
330 | ||
331 | nob -= kiov->kiov_len; | |
332 | conn->ksnc_rx_kiov = ++kiov; | |
333 | conn->ksnc_rx_nkiov--; | |
334 | } while (nob != 0); | |
335 | ||
336 | return 1; | |
337 | } | |
338 | ||
339 | int | |
340 | ksocknal_receive (ksock_conn_t *conn) | |
341 | { | |
342 | /* Return 1 on success, 0 on EOF, < 0 on error. | |
343 | * Caller checks ksnc_rx_nob_wanted to determine | |
344 | * progress/completion. */ | |
345 | int rc; | |
d7e09d03 PT |
346 | |
347 | if (ksocknal_data.ksnd_stall_rx != 0) { | |
348 | cfs_pause(cfs_time_seconds (ksocknal_data.ksnd_stall_rx)); | |
349 | } | |
350 | ||
351 | rc = ksocknal_connsock_addref(conn); | |
352 | if (rc != 0) { | |
353 | LASSERT (conn->ksnc_closing); | |
354 | return (-ESHUTDOWN); | |
355 | } | |
356 | ||
357 | for (;;) { | |
358 | if (conn->ksnc_rx_niov != 0) | |
359 | rc = ksocknal_recv_iov (conn); | |
360 | else | |
361 | rc = ksocknal_recv_kiov (conn); | |
362 | ||
363 | if (rc <= 0) { | |
364 | /* error/EOF or partial receive */ | |
365 | if (rc == -EAGAIN) { | |
366 | rc = 1; | |
367 | } else if (rc == 0 && conn->ksnc_rx_started) { | |
368 | /* EOF in the middle of a message */ | |
369 | rc = -EPROTO; | |
370 | } | |
371 | break; | |
372 | } | |
373 | ||
374 | /* Completed a fragment */ | |
375 | ||
376 | if (conn->ksnc_rx_nob_wanted == 0) { | |
377 | rc = 1; | |
378 | break; | |
379 | } | |
380 | } | |
381 | ||
382 | ksocknal_connsock_decref(conn); | |
0a3bdb00 | 383 | return rc; |
d7e09d03 PT |
384 | } |
385 | ||
386 | void | |
387 | ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx) | |
388 | { | |
389 | lnet_msg_t *lnetmsg = tx->tx_lnetmsg; | |
390 | int rc = (tx->tx_resid == 0 && !tx->tx_zc_aborted) ? 0 : -EIO; | |
d7e09d03 PT |
391 | |
392 | LASSERT(ni != NULL || tx->tx_conn != NULL); | |
393 | ||
394 | if (tx->tx_conn != NULL) | |
395 | ksocknal_conn_decref(tx->tx_conn); | |
396 | ||
397 | if (ni == NULL && tx->tx_conn != NULL) | |
398 | ni = tx->tx_conn->ksnc_peer->ksnp_ni; | |
399 | ||
400 | ksocknal_free_tx (tx); | |
401 | if (lnetmsg != NULL) /* KSOCK_MSG_NOOP go without lnetmsg */ | |
402 | lnet_finalize (ni, lnetmsg, rc); | |
d7e09d03 PT |
403 | } |
404 | ||
405 | void | |
406 | ksocknal_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int error) | |
407 | { | |
408 | ksock_tx_t *tx; | |
409 | ||
410 | while (!list_empty (txlist)) { | |
411 | tx = list_entry (txlist->next, ksock_tx_t, tx_list); | |
412 | ||
413 | if (error && tx->tx_lnetmsg != NULL) { | |
414 | CNETERR("Deleting packet type %d len %d %s->%s\n", | |
415 | le32_to_cpu (tx->tx_lnetmsg->msg_hdr.type), | |
416 | le32_to_cpu (tx->tx_lnetmsg->msg_hdr.payload_length), | |
417 | libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.src_nid)), | |
418 | libcfs_nid2str(le64_to_cpu(tx->tx_lnetmsg->msg_hdr.dest_nid))); | |
419 | } else if (error) { | |
420 | CNETERR("Deleting noop packet\n"); | |
421 | } | |
422 | ||
423 | list_del (&tx->tx_list); | |
424 | ||
425 | LASSERT (atomic_read(&tx->tx_refcount) == 1); | |
426 | ksocknal_tx_done (ni, tx); | |
427 | } | |
428 | } | |
429 | ||
430 | static void | |
431 | ksocknal_check_zc_req(ksock_tx_t *tx) | |
432 | { | |
433 | ksock_conn_t *conn = tx->tx_conn; | |
434 | ksock_peer_t *peer = conn->ksnc_peer; | |
435 | ||
436 | /* Set tx_msg.ksm_zc_cookies[0] to a unique non-zero cookie and add tx | |
437 | * to ksnp_zc_req_list if some fragment of this message should be sent | |
438 | * zero-copy. Our peer will send an ACK containing this cookie when | |
439 | * she has received this message to tell us we can signal completion. | |
440 | * tx_msg.ksm_zc_cookies[0] remains non-zero while tx is on | |
441 | * ksnp_zc_req_list. */ | |
442 | LASSERT (tx->tx_msg.ksm_type != KSOCK_MSG_NOOP); | |
443 | LASSERT (tx->tx_zc_capable); | |
444 | ||
445 | tx->tx_zc_checked = 1; | |
446 | ||
447 | if (conn->ksnc_proto == &ksocknal_protocol_v1x || | |
448 | !conn->ksnc_zc_capable) | |
449 | return; | |
450 | ||
451 | /* assign cookie and queue tx to pending list, it will be released when | |
452 | * a matching ack is received. See ksocknal_handle_zcack() */ | |
453 | ||
454 | ksocknal_tx_addref(tx); | |
455 | ||
456 | spin_lock(&peer->ksnp_lock); | |
457 | ||
458 | /* ZC_REQ is going to be pinned to the peer */ | |
459 | tx->tx_deadline = | |
460 | cfs_time_shift(*ksocknal_tunables.ksnd_timeout); | |
461 | ||
462 | LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0); | |
463 | ||
464 | tx->tx_msg.ksm_zc_cookies[0] = peer->ksnp_zc_next_cookie++; | |
465 | ||
466 | if (peer->ksnp_zc_next_cookie == 0) | |
467 | peer->ksnp_zc_next_cookie = SOCKNAL_KEEPALIVE_PING + 1; | |
468 | ||
469 | list_add_tail(&tx->tx_zc_list, &peer->ksnp_zc_req_list); | |
470 | ||
471 | spin_unlock(&peer->ksnp_lock); | |
472 | } | |
473 | ||
474 | static void | |
475 | ksocknal_uncheck_zc_req(ksock_tx_t *tx) | |
476 | { | |
477 | ksock_peer_t *peer = tx->tx_conn->ksnc_peer; | |
478 | ||
479 | LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP); | |
480 | LASSERT(tx->tx_zc_capable); | |
481 | ||
482 | tx->tx_zc_checked = 0; | |
483 | ||
484 | spin_lock(&peer->ksnp_lock); | |
485 | ||
486 | if (tx->tx_msg.ksm_zc_cookies[0] == 0) { | |
487 | /* Not waiting for an ACK */ | |
488 | spin_unlock(&peer->ksnp_lock); | |
489 | return; | |
490 | } | |
491 | ||
492 | tx->tx_msg.ksm_zc_cookies[0] = 0; | |
493 | list_del(&tx->tx_zc_list); | |
494 | ||
495 | spin_unlock(&peer->ksnp_lock); | |
496 | ||
497 | ksocknal_tx_decref(tx); | |
498 | } | |
499 | ||
500 | int | |
501 | ksocknal_process_transmit (ksock_conn_t *conn, ksock_tx_t *tx) | |
502 | { | |
503 | int rc; | |
504 | ||
505 | if (tx->tx_zc_capable && !tx->tx_zc_checked) | |
506 | ksocknal_check_zc_req(tx); | |
507 | ||
508 | rc = ksocknal_transmit (conn, tx); | |
509 | ||
510 | CDEBUG (D_NET, "send(%d) %d\n", tx->tx_resid, rc); | |
511 | ||
512 | if (tx->tx_resid == 0) { | |
513 | /* Sent everything OK */ | |
514 | LASSERT (rc == 0); | |
515 | ||
516 | return (0); | |
517 | } | |
518 | ||
519 | if (rc == -EAGAIN) | |
520 | return (rc); | |
521 | ||
522 | if (rc == -ENOMEM) { | |
523 | static int counter; | |
524 | ||
525 | counter++; /* exponential backoff warnings */ | |
526 | if ((counter & (-counter)) == counter) | |
527 | CWARN("%u ENOMEM tx %p (%u allocated)\n", | |
528 | counter, conn, atomic_read(&libcfs_kmemory)); | |
529 | ||
530 | /* Queue on ksnd_enomem_conns for retry after a timeout */ | |
531 | spin_lock_bh(&ksocknal_data.ksnd_reaper_lock); | |
532 | ||
533 | /* enomem list takes over scheduler's ref... */ | |
534 | LASSERT (conn->ksnc_tx_scheduled); | |
535 | list_add_tail(&conn->ksnc_tx_list, | |
536 | &ksocknal_data.ksnd_enomem_conns); | |
537 | if (!cfs_time_aftereq(cfs_time_add(cfs_time_current(), | |
538 | SOCKNAL_ENOMEM_RETRY), | |
539 | ksocknal_data.ksnd_reaper_waketime)) | |
540 | wake_up (&ksocknal_data.ksnd_reaper_waitq); | |
541 | ||
542 | spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock); | |
543 | return (rc); | |
544 | } | |
545 | ||
546 | /* Actual error */ | |
547 | LASSERT (rc < 0); | |
548 | ||
549 | if (!conn->ksnc_closing) { | |
550 | switch (rc) { | |
551 | case -ECONNRESET: | |
5e8f6920 | 552 | LCONSOLE_WARN("Host %pI4h reset our connection " |
d7e09d03 PT |
553 | "while we were sending data; it may have " |
554 | "rebooted.\n", | |
5e8f6920 | 555 | &conn->ksnc_ipaddr); |
d7e09d03 PT |
556 | break; |
557 | default: | |
558 | LCONSOLE_WARN("There was an unexpected network error " | |
5e8f6920 PT |
559 | "while writing to %pI4h: %d.\n", |
560 | &conn->ksnc_ipaddr, rc); | |
d7e09d03 PT |
561 | break; |
562 | } | |
563 | CDEBUG(D_NET, "[%p] Error %d on write to %s" | |
5e8f6920 | 564 | " ip %pI4h:%d\n", conn, rc, |
d7e09d03 | 565 | libcfs_id2str(conn->ksnc_peer->ksnp_id), |
5e8f6920 | 566 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
567 | conn->ksnc_port); |
568 | } | |
569 | ||
570 | if (tx->tx_zc_checked) | |
571 | ksocknal_uncheck_zc_req(tx); | |
572 | ||
573 | /* it's not an error if conn is being closed */ | |
574 | ksocknal_close_conn_and_siblings (conn, | |
575 | (conn->ksnc_closing) ? 0 : rc); | |
576 | ||
577 | return (rc); | |
578 | } | |
579 | ||
580 | void | |
581 | ksocknal_launch_connection_locked (ksock_route_t *route) | |
582 | { | |
583 | ||
584 | /* called holding write lock on ksnd_global_lock */ | |
585 | ||
586 | LASSERT (!route->ksnr_scheduled); | |
587 | LASSERT (!route->ksnr_connecting); | |
588 | LASSERT ((ksocknal_route_mask() & ~route->ksnr_connected) != 0); | |
589 | ||
590 | route->ksnr_scheduled = 1; /* scheduling conn for connd */ | |
591 | ksocknal_route_addref(route); /* extra ref for connd */ | |
592 | ||
593 | spin_lock_bh(&ksocknal_data.ksnd_connd_lock); | |
594 | ||
595 | list_add_tail(&route->ksnr_connd_list, | |
596 | &ksocknal_data.ksnd_connd_routes); | |
597 | wake_up(&ksocknal_data.ksnd_connd_waitq); | |
598 | ||
599 | spin_unlock_bh(&ksocknal_data.ksnd_connd_lock); | |
600 | } | |
601 | ||
602 | void | |
603 | ksocknal_launch_all_connections_locked (ksock_peer_t *peer) | |
604 | { | |
605 | ksock_route_t *route; | |
606 | ||
607 | /* called holding write lock on ksnd_global_lock */ | |
608 | for (;;) { | |
609 | /* launch any/all connections that need it */ | |
610 | route = ksocknal_find_connectable_route_locked(peer); | |
611 | if (route == NULL) | |
612 | return; | |
613 | ||
614 | ksocknal_launch_connection_locked(route); | |
615 | } | |
616 | } | |
617 | ||
618 | ksock_conn_t * | |
619 | ksocknal_find_conn_locked(ksock_peer_t *peer, ksock_tx_t *tx, int nonblk) | |
620 | { | |
621 | struct list_head *tmp; | |
622 | ksock_conn_t *conn; | |
623 | ksock_conn_t *typed = NULL; | |
624 | ksock_conn_t *fallback = NULL; | |
625 | int tnob = 0; | |
626 | int fnob = 0; | |
627 | ||
628 | list_for_each (tmp, &peer->ksnp_conns) { | |
629 | ksock_conn_t *c = list_entry(tmp, ksock_conn_t, ksnc_list); | |
630 | int nob = atomic_read(&c->ksnc_tx_nob) + | |
631 | cfs_sock_wmem_queued(c->ksnc_sock); | |
632 | int rc; | |
633 | ||
634 | LASSERT (!c->ksnc_closing); | |
635 | LASSERT (c->ksnc_proto != NULL && | |
636 | c->ksnc_proto->pro_match_tx != NULL); | |
637 | ||
638 | rc = c->ksnc_proto->pro_match_tx(c, tx, nonblk); | |
639 | ||
640 | switch (rc) { | |
641 | default: | |
642 | LBUG(); | |
643 | case SOCKNAL_MATCH_NO: /* protocol rejected the tx */ | |
644 | continue; | |
645 | ||
646 | case SOCKNAL_MATCH_YES: /* typed connection */ | |
647 | if (typed == NULL || tnob > nob || | |
648 | (tnob == nob && *ksocknal_tunables.ksnd_round_robin && | |
649 | cfs_time_after(typed->ksnc_tx_last_post, c->ksnc_tx_last_post))) { | |
650 | typed = c; | |
651 | tnob = nob; | |
652 | } | |
653 | break; | |
654 | ||
655 | case SOCKNAL_MATCH_MAY: /* fallback connection */ | |
656 | if (fallback == NULL || fnob > nob || | |
657 | (fnob == nob && *ksocknal_tunables.ksnd_round_robin && | |
658 | cfs_time_after(fallback->ksnc_tx_last_post, c->ksnc_tx_last_post))) { | |
659 | fallback = c; | |
660 | fnob = nob; | |
661 | } | |
662 | break; | |
663 | } | |
664 | } | |
665 | ||
666 | /* prefer the typed selection */ | |
667 | conn = (typed != NULL) ? typed : fallback; | |
668 | ||
669 | if (conn != NULL) | |
670 | conn->ksnc_tx_last_post = cfs_time_current(); | |
671 | ||
672 | return conn; | |
673 | } | |
674 | ||
675 | void | |
676 | ksocknal_tx_prep(ksock_conn_t *conn, ksock_tx_t *tx) | |
677 | { | |
678 | conn->ksnc_proto->pro_pack(tx); | |
679 | ||
680 | atomic_add (tx->tx_nob, &conn->ksnc_tx_nob); | |
681 | ksocknal_conn_addref(conn); /* +1 ref for tx */ | |
682 | tx->tx_conn = conn; | |
683 | } | |
684 | ||
685 | void | |
686 | ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn) | |
687 | { | |
688 | ksock_sched_t *sched = conn->ksnc_scheduler; | |
689 | ksock_msg_t *msg = &tx->tx_msg; | |
690 | ksock_tx_t *ztx = NULL; | |
691 | int bufnob = 0; | |
692 | ||
693 | /* called holding global lock (read or irq-write) and caller may | |
694 | * not have dropped this lock between finding conn and calling me, | |
695 | * so we don't need the {get,put}connsock dance to deref | |
696 | * ksnc_sock... */ | |
697 | LASSERT(!conn->ksnc_closing); | |
698 | ||
5e8f6920 | 699 | CDEBUG(D_NET, "Sending to %s ip %pI4h:%d\n", |
d7e09d03 | 700 | libcfs_id2str(conn->ksnc_peer->ksnp_id), |
5e8f6920 | 701 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
702 | conn->ksnc_port); |
703 | ||
704 | ksocknal_tx_prep(conn, tx); | |
705 | ||
706 | /* Ensure the frags we've been given EXACTLY match the number of | |
707 | * bytes we want to send. Many TCP/IP stacks disregard any total | |
708 | * size parameters passed to them and just look at the frags. | |
709 | * | |
710 | * We always expect at least 1 mapped fragment containing the | |
711 | * complete ksocknal message header. */ | |
712 | LASSERT (lnet_iov_nob (tx->tx_niov, tx->tx_iov) + | |
713 | lnet_kiov_nob(tx->tx_nkiov, tx->tx_kiov) == | |
714 | (unsigned int)tx->tx_nob); | |
715 | LASSERT (tx->tx_niov >= 1); | |
716 | LASSERT (tx->tx_resid == tx->tx_nob); | |
717 | ||
718 | CDEBUG (D_NET, "Packet %p type %d, nob %d niov %d nkiov %d\n", | |
719 | tx, (tx->tx_lnetmsg != NULL) ? tx->tx_lnetmsg->msg_hdr.type: | |
720 | KSOCK_MSG_NOOP, | |
721 | tx->tx_nob, tx->tx_niov, tx->tx_nkiov); | |
722 | ||
723 | /* | |
724 | * FIXME: SOCK_WMEM_QUEUED and SOCK_ERROR could block in __DARWIN8__ | |
725 | * but they're used inside spinlocks a lot. | |
726 | */ | |
727 | bufnob = cfs_sock_wmem_queued(conn->ksnc_sock); | |
728 | spin_lock_bh(&sched->kss_lock); | |
729 | ||
730 | if (list_empty(&conn->ksnc_tx_queue) && bufnob == 0) { | |
731 | /* First packet starts the timeout */ | |
732 | conn->ksnc_tx_deadline = | |
733 | cfs_time_shift(*ksocknal_tunables.ksnd_timeout); | |
734 | if (conn->ksnc_tx_bufnob > 0) /* something got ACKed */ | |
735 | conn->ksnc_peer->ksnp_last_alive = cfs_time_current(); | |
736 | conn->ksnc_tx_bufnob = 0; | |
737 | mb(); /* order with adding to tx_queue */ | |
738 | } | |
739 | ||
740 | if (msg->ksm_type == KSOCK_MSG_NOOP) { | |
741 | /* The packet is noop ZC ACK, try to piggyback the ack_cookie | |
742 | * on a normal packet so I don't need to send it */ | |
743 | LASSERT (msg->ksm_zc_cookies[1] != 0); | |
744 | LASSERT (conn->ksnc_proto->pro_queue_tx_zcack != NULL); | |
745 | ||
746 | if (conn->ksnc_proto->pro_queue_tx_zcack(conn, tx, 0)) | |
747 | ztx = tx; /* ZC ACK piggybacked on ztx release tx later */ | |
748 | ||
749 | } else { | |
750 | /* It's a normal packet - can it piggback a noop zc-ack that | |
751 | * has been queued already? */ | |
752 | LASSERT (msg->ksm_zc_cookies[1] == 0); | |
753 | LASSERT (conn->ksnc_proto->pro_queue_tx_msg != NULL); | |
754 | ||
755 | ztx = conn->ksnc_proto->pro_queue_tx_msg(conn, tx); | |
756 | /* ztx will be released later */ | |
757 | } | |
758 | ||
759 | if (ztx != NULL) { | |
760 | atomic_sub (ztx->tx_nob, &conn->ksnc_tx_nob); | |
761 | list_add_tail(&ztx->tx_list, &sched->kss_zombie_noop_txs); | |
762 | } | |
763 | ||
764 | if (conn->ksnc_tx_ready && /* able to send */ | |
765 | !conn->ksnc_tx_scheduled) { /* not scheduled to send */ | |
766 | /* +1 ref for scheduler */ | |
767 | ksocknal_conn_addref(conn); | |
768 | list_add_tail (&conn->ksnc_tx_list, | |
769 | &sched->kss_tx_conns); | |
770 | conn->ksnc_tx_scheduled = 1; | |
771 | wake_up (&sched->kss_waitq); | |
772 | } | |
773 | ||
774 | spin_unlock_bh(&sched->kss_lock); | |
775 | } | |
776 | ||
777 | ||
778 | ksock_route_t * | |
779 | ksocknal_find_connectable_route_locked (ksock_peer_t *peer) | |
780 | { | |
781 | cfs_time_t now = cfs_time_current(); | |
782 | struct list_head *tmp; | |
783 | ksock_route_t *route; | |
784 | ||
785 | list_for_each (tmp, &peer->ksnp_routes) { | |
786 | route = list_entry (tmp, ksock_route_t, ksnr_list); | |
787 | ||
788 | LASSERT (!route->ksnr_connecting || route->ksnr_scheduled); | |
789 | ||
790 | if (route->ksnr_scheduled) /* connections being established */ | |
791 | continue; | |
792 | ||
793 | /* all route types connected ? */ | |
794 | if ((ksocknal_route_mask() & ~route->ksnr_connected) == 0) | |
795 | continue; | |
796 | ||
797 | if (!(route->ksnr_retry_interval == 0 || /* first attempt */ | |
798 | cfs_time_aftereq(now, route->ksnr_timeout))) { | |
799 | CDEBUG(D_NET, | |
5e8f6920 | 800 | "Too soon to retry route %pI4h " |
d7e09d03 | 801 | "(cnted %d, interval %ld, %ld secs later)\n", |
5e8f6920 | 802 | &route->ksnr_ipaddr, |
d7e09d03 PT |
803 | route->ksnr_connected, |
804 | route->ksnr_retry_interval, | |
805 | cfs_duration_sec(route->ksnr_timeout - now)); | |
806 | continue; | |
807 | } | |
808 | ||
809 | return (route); | |
810 | } | |
811 | ||
812 | return (NULL); | |
813 | } | |
814 | ||
815 | ksock_route_t * | |
816 | ksocknal_find_connecting_route_locked (ksock_peer_t *peer) | |
817 | { | |
818 | struct list_head *tmp; | |
819 | ksock_route_t *route; | |
820 | ||
821 | list_for_each (tmp, &peer->ksnp_routes) { | |
822 | route = list_entry (tmp, ksock_route_t, ksnr_list); | |
823 | ||
824 | LASSERT (!route->ksnr_connecting || route->ksnr_scheduled); | |
825 | ||
826 | if (route->ksnr_scheduled) | |
827 | return (route); | |
828 | } | |
829 | ||
830 | return (NULL); | |
831 | } | |
832 | ||
833 | int | |
834 | ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id) | |
835 | { | |
836 | ksock_peer_t *peer; | |
837 | ksock_conn_t *conn; | |
838 | rwlock_t *g_lock; | |
839 | int retry; | |
840 | int rc; | |
841 | ||
842 | LASSERT (tx->tx_conn == NULL); | |
843 | ||
844 | g_lock = &ksocknal_data.ksnd_global_lock; | |
845 | ||
846 | for (retry = 0;; retry = 1) { | |
847 | read_lock(g_lock); | |
848 | peer = ksocknal_find_peer_locked(ni, id); | |
849 | if (peer != NULL) { | |
850 | if (ksocknal_find_connectable_route_locked(peer) == NULL) { | |
851 | conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk); | |
852 | if (conn != NULL) { | |
853 | /* I've got no routes that need to be | |
854 | * connecting and I do have an actual | |
855 | * connection... */ | |
856 | ksocknal_queue_tx_locked (tx, conn); | |
857 | read_unlock(g_lock); | |
858 | return (0); | |
859 | } | |
860 | } | |
861 | } | |
862 | ||
863 | /* I'll need a write lock... */ | |
864 | read_unlock(g_lock); | |
865 | ||
866 | write_lock_bh(g_lock); | |
867 | ||
868 | peer = ksocknal_find_peer_locked(ni, id); | |
869 | if (peer != NULL) | |
870 | break; | |
871 | ||
872 | write_unlock_bh(g_lock); | |
873 | ||
874 | if ((id.pid & LNET_PID_USERFLAG) != 0) { | |
875 | CERROR("Refusing to create a connection to " | |
876 | "userspace process %s\n", libcfs_id2str(id)); | |
877 | return -EHOSTUNREACH; | |
878 | } | |
879 | ||
880 | if (retry) { | |
881 | CERROR("Can't find peer %s\n", libcfs_id2str(id)); | |
882 | return -EHOSTUNREACH; | |
883 | } | |
884 | ||
885 | rc = ksocknal_add_peer(ni, id, | |
886 | LNET_NIDADDR(id.nid), | |
887 | lnet_acceptor_port()); | |
888 | if (rc != 0) { | |
889 | CERROR("Can't add peer %s: %d\n", | |
890 | libcfs_id2str(id), rc); | |
891 | return rc; | |
892 | } | |
893 | } | |
894 | ||
895 | ksocknal_launch_all_connections_locked(peer); | |
896 | ||
897 | conn = ksocknal_find_conn_locked(peer, tx, tx->tx_nonblk); | |
898 | if (conn != NULL) { | |
899 | /* Connection exists; queue message on it */ | |
900 | ksocknal_queue_tx_locked (tx, conn); | |
901 | write_unlock_bh(g_lock); | |
902 | return (0); | |
903 | } | |
904 | ||
905 | if (peer->ksnp_accepting > 0 || | |
906 | ksocknal_find_connecting_route_locked (peer) != NULL) { | |
907 | /* the message is going to be pinned to the peer */ | |
908 | tx->tx_deadline = | |
909 | cfs_time_shift(*ksocknal_tunables.ksnd_timeout); | |
910 | ||
911 | /* Queue the message until a connection is established */ | |
912 | list_add_tail (&tx->tx_list, &peer->ksnp_tx_queue); | |
913 | write_unlock_bh(g_lock); | |
914 | return 0; | |
915 | } | |
916 | ||
917 | write_unlock_bh(g_lock); | |
918 | ||
919 | /* NB Routes may be ignored if connections to them failed recently */ | |
920 | CNETERR("No usable routes to %s\n", libcfs_id2str(id)); | |
921 | return (-EHOSTUNREACH); | |
922 | } | |
923 | ||
924 | int | |
925 | ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg) | |
926 | { | |
aadbacc7 | 927 | int mpflag = 1; |
d7e09d03 PT |
928 | int type = lntmsg->msg_type; |
929 | lnet_process_id_t target = lntmsg->msg_target; | |
930 | unsigned int payload_niov = lntmsg->msg_niov; | |
931 | struct iovec *payload_iov = lntmsg->msg_iov; | |
932 | lnet_kiov_t *payload_kiov = lntmsg->msg_kiov; | |
933 | unsigned int payload_offset = lntmsg->msg_offset; | |
934 | unsigned int payload_nob = lntmsg->msg_len; | |
935 | ksock_tx_t *tx; | |
936 | int desc_size; | |
937 | int rc; | |
938 | ||
939 | /* NB 'private' is different depending on what we're sending. | |
940 | * Just ignore it... */ | |
941 | ||
942 | CDEBUG(D_NET, "sending %u bytes in %d frags to %s\n", | |
943 | payload_nob, payload_niov, libcfs_id2str(target)); | |
944 | ||
945 | LASSERT (payload_nob == 0 || payload_niov > 0); | |
946 | LASSERT (payload_niov <= LNET_MAX_IOV); | |
947 | /* payload is either all vaddrs or all pages */ | |
948 | LASSERT (!(payload_kiov != NULL && payload_iov != NULL)); | |
949 | LASSERT (!in_interrupt ()); | |
950 | ||
951 | if (payload_iov != NULL) | |
952 | desc_size = offsetof(ksock_tx_t, | |
953 | tx_frags.virt.iov[1 + payload_niov]); | |
954 | else | |
955 | desc_size = offsetof(ksock_tx_t, | |
956 | tx_frags.paged.kiov[payload_niov]); | |
957 | ||
958 | if (lntmsg->msg_vmflush) | |
959 | mpflag = cfs_memory_pressure_get_and_set(); | |
960 | tx = ksocknal_alloc_tx(KSOCK_MSG_LNET, desc_size); | |
961 | if (tx == NULL) { | |
962 | CERROR("Can't allocate tx desc type %d size %d\n", | |
963 | type, desc_size); | |
964 | if (lntmsg->msg_vmflush) | |
965 | cfs_memory_pressure_restore(mpflag); | |
966 | return (-ENOMEM); | |
967 | } | |
968 | ||
969 | tx->tx_conn = NULL; /* set when assigned a conn */ | |
970 | tx->tx_lnetmsg = lntmsg; | |
971 | ||
972 | if (payload_iov != NULL) { | |
973 | tx->tx_kiov = NULL; | |
974 | tx->tx_nkiov = 0; | |
975 | tx->tx_iov = tx->tx_frags.virt.iov; | |
976 | tx->tx_niov = 1 + | |
977 | lnet_extract_iov(payload_niov, &tx->tx_iov[1], | |
978 | payload_niov, payload_iov, | |
979 | payload_offset, payload_nob); | |
980 | } else { | |
981 | tx->tx_niov = 1; | |
982 | tx->tx_iov = &tx->tx_frags.paged.iov; | |
983 | tx->tx_kiov = tx->tx_frags.paged.kiov; | |
984 | tx->tx_nkiov = lnet_extract_kiov(payload_niov, tx->tx_kiov, | |
985 | payload_niov, payload_kiov, | |
986 | payload_offset, payload_nob); | |
987 | ||
988 | if (payload_nob >= *ksocknal_tunables.ksnd_zc_min_payload) | |
989 | tx->tx_zc_capable = 1; | |
990 | } | |
991 | ||
992 | socklnd_init_msg(&tx->tx_msg, KSOCK_MSG_LNET); | |
993 | ||
994 | /* The first fragment will be set later in pro_pack */ | |
995 | rc = ksocknal_launch_packet(ni, tx, target); | |
aadbacc7 | 996 | if (!mpflag) |
d7e09d03 | 997 | cfs_memory_pressure_restore(mpflag); |
aadbacc7 | 998 | |
d7e09d03 PT |
999 | if (rc == 0) |
1000 | return (0); | |
1001 | ||
1002 | ksocknal_free_tx(tx); | |
1003 | return (-EIO); | |
1004 | } | |
1005 | ||
1006 | int | |
1007 | ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name) | |
1008 | { | |
9edf0f67 | 1009 | struct task_struct *task = kthread_run(fn, arg, "%s", name); |
d7e09d03 PT |
1010 | |
1011 | if (IS_ERR(task)) | |
1012 | return PTR_ERR(task); | |
1013 | ||
1014 | write_lock_bh(&ksocknal_data.ksnd_global_lock); | |
1015 | ksocknal_data.ksnd_nthreads++; | |
1016 | write_unlock_bh(&ksocknal_data.ksnd_global_lock); | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | void | |
1021 | ksocknal_thread_fini (void) | |
1022 | { | |
1023 | write_lock_bh(&ksocknal_data.ksnd_global_lock); | |
1024 | ksocknal_data.ksnd_nthreads--; | |
1025 | write_unlock_bh(&ksocknal_data.ksnd_global_lock); | |
1026 | } | |
1027 | ||
1028 | int | |
1029 | ksocknal_new_packet (ksock_conn_t *conn, int nob_to_skip) | |
1030 | { | |
1031 | static char ksocknal_slop_buffer[4096]; | |
1032 | ||
1033 | int nob; | |
1034 | unsigned int niov; | |
1035 | int skipped; | |
1036 | ||
1037 | LASSERT(conn->ksnc_proto != NULL); | |
1038 | ||
1039 | if ((*ksocknal_tunables.ksnd_eager_ack & conn->ksnc_type) != 0) { | |
1040 | /* Remind the socket to ack eagerly... */ | |
1041 | ksocknal_lib_eager_ack(conn); | |
1042 | } | |
1043 | ||
1044 | if (nob_to_skip == 0) { /* right at next packet boundary now */ | |
1045 | conn->ksnc_rx_started = 0; | |
1046 | mb(); /* racing with timeout thread */ | |
1047 | ||
1048 | switch (conn->ksnc_proto->pro_version) { | |
1049 | case KSOCK_PROTO_V2: | |
1050 | case KSOCK_PROTO_V3: | |
1051 | conn->ksnc_rx_state = SOCKNAL_RX_KSM_HEADER; | |
1052 | conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space; | |
1053 | conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg; | |
1054 | ||
1055 | conn->ksnc_rx_nob_wanted = offsetof(ksock_msg_t, ksm_u); | |
1056 | conn->ksnc_rx_nob_left = offsetof(ksock_msg_t, ksm_u); | |
1057 | conn->ksnc_rx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u); | |
1058 | break; | |
1059 | ||
1060 | case KSOCK_PROTO_V1: | |
1061 | /* Receiving bare lnet_hdr_t */ | |
1062 | conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER; | |
1063 | conn->ksnc_rx_nob_wanted = sizeof(lnet_hdr_t); | |
1064 | conn->ksnc_rx_nob_left = sizeof(lnet_hdr_t); | |
1065 | ||
1066 | conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space; | |
1067 | conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg; | |
1068 | conn->ksnc_rx_iov[0].iov_len = sizeof (lnet_hdr_t); | |
1069 | break; | |
1070 | ||
1071 | default: | |
1072 | LBUG (); | |
1073 | } | |
1074 | conn->ksnc_rx_niov = 1; | |
1075 | ||
1076 | conn->ksnc_rx_kiov = NULL; | |
1077 | conn->ksnc_rx_nkiov = 0; | |
1078 | conn->ksnc_rx_csum = ~0; | |
1079 | return (1); | |
1080 | } | |
1081 | ||
1082 | /* Set up to skip as much as possible now. If there's more left | |
1083 | * (ran out of iov entries) we'll get called again */ | |
1084 | ||
1085 | conn->ksnc_rx_state = SOCKNAL_RX_SLOP; | |
1086 | conn->ksnc_rx_nob_left = nob_to_skip; | |
1087 | conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space; | |
1088 | skipped = 0; | |
1089 | niov = 0; | |
1090 | ||
1091 | do { | |
1092 | nob = MIN (nob_to_skip, sizeof (ksocknal_slop_buffer)); | |
1093 | ||
1094 | conn->ksnc_rx_iov[niov].iov_base = ksocknal_slop_buffer; | |
1095 | conn->ksnc_rx_iov[niov].iov_len = nob; | |
1096 | niov++; | |
1097 | skipped += nob; | |
1098 | nob_to_skip -=nob; | |
1099 | ||
1100 | } while (nob_to_skip != 0 && /* mustn't overflow conn's rx iov */ | |
1101 | niov < sizeof(conn->ksnc_rx_iov_space) / sizeof (struct iovec)); | |
1102 | ||
1103 | conn->ksnc_rx_niov = niov; | |
1104 | conn->ksnc_rx_kiov = NULL; | |
1105 | conn->ksnc_rx_nkiov = 0; | |
1106 | conn->ksnc_rx_nob_wanted = skipped; | |
1107 | return (0); | |
1108 | } | |
1109 | ||
1110 | int | |
1111 | ksocknal_process_receive (ksock_conn_t *conn) | |
1112 | { | |
1113 | lnet_hdr_t *lhdr; | |
1114 | lnet_process_id_t *id; | |
1115 | int rc; | |
1116 | ||
1117 | LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0); | |
1118 | ||
1119 | /* NB: sched lock NOT held */ | |
2b284326 | 1120 | /* SOCKNAL_RX_LNET_HEADER is here for backward compatibility */ |
d7e09d03 PT |
1121 | LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_KSM_HEADER || |
1122 | conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD || | |
1123 | conn->ksnc_rx_state == SOCKNAL_RX_LNET_HEADER || | |
1124 | conn->ksnc_rx_state == SOCKNAL_RX_SLOP); | |
1125 | again: | |
1126 | if (conn->ksnc_rx_nob_wanted != 0) { | |
1127 | rc = ksocknal_receive(conn); | |
1128 | ||
1129 | if (rc <= 0) { | |
1130 | LASSERT (rc != -EAGAIN); | |
1131 | ||
1132 | if (rc == 0) | |
5e8f6920 PT |
1133 | CDEBUG(D_NET, "[%p] EOF from %s" |
1134 | " ip %pI4h:%d\n", conn, | |
d7e09d03 | 1135 | libcfs_id2str(conn->ksnc_peer->ksnp_id), |
5e8f6920 | 1136 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
1137 | conn->ksnc_port); |
1138 | else if (!conn->ksnc_closing) | |
5e8f6920 PT |
1139 | CERROR("[%p] Error %d on read from %s" |
1140 | " ip %pI4h:%d\n", | |
d7e09d03 PT |
1141 | conn, rc, |
1142 | libcfs_id2str(conn->ksnc_peer->ksnp_id), | |
5e8f6920 | 1143 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
1144 | conn->ksnc_port); |
1145 | ||
1146 | /* it's not an error if conn is being closed */ | |
1147 | ksocknal_close_conn_and_siblings (conn, | |
1148 | (conn->ksnc_closing) ? 0 : rc); | |
1149 | return (rc == 0 ? -ESHUTDOWN : rc); | |
1150 | } | |
1151 | ||
1152 | if (conn->ksnc_rx_nob_wanted != 0) { | |
1153 | /* short read */ | |
1154 | return (-EAGAIN); | |
1155 | } | |
1156 | } | |
1157 | switch (conn->ksnc_rx_state) { | |
1158 | case SOCKNAL_RX_KSM_HEADER: | |
1159 | if (conn->ksnc_flip) { | |
1160 | __swab32s(&conn->ksnc_msg.ksm_type); | |
1161 | __swab32s(&conn->ksnc_msg.ksm_csum); | |
1162 | __swab64s(&conn->ksnc_msg.ksm_zc_cookies[0]); | |
1163 | __swab64s(&conn->ksnc_msg.ksm_zc_cookies[1]); | |
1164 | } | |
1165 | ||
1166 | if (conn->ksnc_msg.ksm_type != KSOCK_MSG_NOOP && | |
1167 | conn->ksnc_msg.ksm_type != KSOCK_MSG_LNET) { | |
1168 | CERROR("%s: Unknown message type: %x\n", | |
1169 | libcfs_id2str(conn->ksnc_peer->ksnp_id), | |
1170 | conn->ksnc_msg.ksm_type); | |
1171 | ksocknal_new_packet(conn, 0); | |
1172 | ksocknal_close_conn_and_siblings(conn, -EPROTO); | |
1173 | return (-EPROTO); | |
1174 | } | |
1175 | ||
1176 | if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP && | |
1177 | conn->ksnc_msg.ksm_csum != 0 && /* has checksum */ | |
1178 | conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) { | |
1179 | /* NOOP Checksum error */ | |
1180 | CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n", | |
1181 | libcfs_id2str(conn->ksnc_peer->ksnp_id), | |
1182 | conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum); | |
1183 | ksocknal_new_packet(conn, 0); | |
1184 | ksocknal_close_conn_and_siblings(conn, -EPROTO); | |
1185 | return (-EIO); | |
1186 | } | |
1187 | ||
1188 | if (conn->ksnc_msg.ksm_zc_cookies[1] != 0) { | |
1189 | __u64 cookie = 0; | |
1190 | ||
1191 | LASSERT (conn->ksnc_proto != &ksocknal_protocol_v1x); | |
1192 | ||
1193 | if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) | |
1194 | cookie = conn->ksnc_msg.ksm_zc_cookies[0]; | |
1195 | ||
1196 | rc = conn->ksnc_proto->pro_handle_zcack(conn, cookie, | |
1197 | conn->ksnc_msg.ksm_zc_cookies[1]); | |
1198 | ||
1199 | if (rc != 0) { | |
1200 | CERROR("%s: Unknown ZC-ACK cookie: "LPU64", "LPU64"\n", | |
1201 | libcfs_id2str(conn->ksnc_peer->ksnp_id), | |
1202 | cookie, conn->ksnc_msg.ksm_zc_cookies[1]); | |
1203 | ksocknal_new_packet(conn, 0); | |
1204 | ksocknal_close_conn_and_siblings(conn, -EPROTO); | |
1205 | return (rc); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | if (conn->ksnc_msg.ksm_type == KSOCK_MSG_NOOP) { | |
1210 | ksocknal_new_packet (conn, 0); | |
1211 | return 0; /* NOOP is done and just return */ | |
1212 | } | |
1213 | ||
1214 | conn->ksnc_rx_state = SOCKNAL_RX_LNET_HEADER; | |
1215 | conn->ksnc_rx_nob_wanted = sizeof(ksock_lnet_msg_t); | |
1216 | conn->ksnc_rx_nob_left = sizeof(ksock_lnet_msg_t); | |
1217 | ||
1218 | conn->ksnc_rx_iov = (struct iovec *)&conn->ksnc_rx_iov_space; | |
1219 | conn->ksnc_rx_iov[0].iov_base = (char *)&conn->ksnc_msg.ksm_u.lnetmsg; | |
1220 | conn->ksnc_rx_iov[0].iov_len = sizeof(ksock_lnet_msg_t); | |
1221 | ||
1222 | conn->ksnc_rx_niov = 1; | |
1223 | conn->ksnc_rx_kiov = NULL; | |
1224 | conn->ksnc_rx_nkiov = 0; | |
1225 | ||
1226 | goto again; /* read lnet header now */ | |
1227 | ||
1228 | case SOCKNAL_RX_LNET_HEADER: | |
1229 | /* unpack message header */ | |
1230 | conn->ksnc_proto->pro_unpack(&conn->ksnc_msg); | |
1231 | ||
1232 | if ((conn->ksnc_peer->ksnp_id.pid & LNET_PID_USERFLAG) != 0) { | |
1233 | /* Userspace peer */ | |
1234 | lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr; | |
1235 | id = &conn->ksnc_peer->ksnp_id; | |
1236 | ||
1237 | /* Substitute process ID assigned at connection time */ | |
1238 | lhdr->src_pid = cpu_to_le32(id->pid); | |
1239 | lhdr->src_nid = cpu_to_le64(id->nid); | |
1240 | } | |
1241 | ||
1242 | conn->ksnc_rx_state = SOCKNAL_RX_PARSE; | |
1243 | ksocknal_conn_addref(conn); /* ++ref while parsing */ | |
1244 | ||
1245 | rc = lnet_parse(conn->ksnc_peer->ksnp_ni, | |
1246 | &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr, | |
1247 | conn->ksnc_peer->ksnp_id.nid, conn, 0); | |
1248 | if (rc < 0) { | |
1249 | /* I just received garbage: give up on this conn */ | |
1250 | ksocknal_new_packet(conn, 0); | |
1251 | ksocknal_close_conn_and_siblings (conn, rc); | |
1252 | ksocknal_conn_decref(conn); | |
1253 | return (-EPROTO); | |
1254 | } | |
1255 | ||
1256 | /* I'm racing with ksocknal_recv() */ | |
1257 | LASSERT (conn->ksnc_rx_state == SOCKNAL_RX_PARSE || | |
1258 | conn->ksnc_rx_state == SOCKNAL_RX_LNET_PAYLOAD); | |
1259 | ||
1260 | if (conn->ksnc_rx_state != SOCKNAL_RX_LNET_PAYLOAD) | |
1261 | return 0; | |
1262 | ||
1263 | /* ksocknal_recv() got called */ | |
1264 | goto again; | |
1265 | ||
1266 | case SOCKNAL_RX_LNET_PAYLOAD: | |
1267 | /* payload all received */ | |
1268 | rc = 0; | |
1269 | ||
1270 | if (conn->ksnc_rx_nob_left == 0 && /* not truncating */ | |
1271 | conn->ksnc_msg.ksm_csum != 0 && /* has checksum */ | |
1272 | conn->ksnc_msg.ksm_csum != conn->ksnc_rx_csum) { | |
1273 | CERROR("%s: Checksum error, wire:0x%08X data:0x%08X\n", | |
1274 | libcfs_id2str(conn->ksnc_peer->ksnp_id), | |
1275 | conn->ksnc_msg.ksm_csum, conn->ksnc_rx_csum); | |
1276 | rc = -EIO; | |
1277 | } | |
1278 | ||
1279 | if (rc == 0 && conn->ksnc_msg.ksm_zc_cookies[0] != 0) { | |
1280 | LASSERT(conn->ksnc_proto != &ksocknal_protocol_v1x); | |
1281 | ||
1282 | lhdr = &conn->ksnc_msg.ksm_u.lnetmsg.ksnm_hdr; | |
1283 | id = &conn->ksnc_peer->ksnp_id; | |
1284 | ||
1285 | rc = conn->ksnc_proto->pro_handle_zcreq(conn, | |
1286 | conn->ksnc_msg.ksm_zc_cookies[0], | |
1287 | *ksocknal_tunables.ksnd_nonblk_zcack || | |
1288 | le64_to_cpu(lhdr->src_nid) != id->nid); | |
1289 | } | |
1290 | ||
1291 | lnet_finalize(conn->ksnc_peer->ksnp_ni, conn->ksnc_cookie, rc); | |
1292 | ||
1293 | if (rc != 0) { | |
1294 | ksocknal_new_packet(conn, 0); | |
1295 | ksocknal_close_conn_and_siblings (conn, rc); | |
1296 | return (-EPROTO); | |
1297 | } | |
1298 | /* Fall through */ | |
1299 | ||
1300 | case SOCKNAL_RX_SLOP: | |
1301 | /* starting new packet? */ | |
1302 | if (ksocknal_new_packet (conn, conn->ksnc_rx_nob_left)) | |
1303 | return 0; /* come back later */ | |
1304 | goto again; /* try to finish reading slop now */ | |
1305 | ||
1306 | default: | |
1307 | break; | |
1308 | } | |
1309 | ||
1310 | /* Not Reached */ | |
1311 | LBUG (); | |
1312 | return (-EINVAL); /* keep gcc happy */ | |
1313 | } | |
1314 | ||
1315 | int | |
1316 | ksocknal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed, | |
1317 | unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov, | |
1318 | unsigned int offset, unsigned int mlen, unsigned int rlen) | |
1319 | { | |
1320 | ksock_conn_t *conn = (ksock_conn_t *)private; | |
1321 | ksock_sched_t *sched = conn->ksnc_scheduler; | |
1322 | ||
1323 | LASSERT (mlen <= rlen); | |
1324 | LASSERT (niov <= LNET_MAX_IOV); | |
1325 | ||
1326 | conn->ksnc_cookie = msg; | |
1327 | conn->ksnc_rx_nob_wanted = mlen; | |
1328 | conn->ksnc_rx_nob_left = rlen; | |
1329 | ||
1330 | if (mlen == 0 || iov != NULL) { | |
1331 | conn->ksnc_rx_nkiov = 0; | |
1332 | conn->ksnc_rx_kiov = NULL; | |
1333 | conn->ksnc_rx_iov = conn->ksnc_rx_iov_space.iov; | |
1334 | conn->ksnc_rx_niov = | |
1335 | lnet_extract_iov(LNET_MAX_IOV, conn->ksnc_rx_iov, | |
1336 | niov, iov, offset, mlen); | |
1337 | } else { | |
1338 | conn->ksnc_rx_niov = 0; | |
1339 | conn->ksnc_rx_iov = NULL; | |
1340 | conn->ksnc_rx_kiov = conn->ksnc_rx_iov_space.kiov; | |
1341 | conn->ksnc_rx_nkiov = | |
1342 | lnet_extract_kiov(LNET_MAX_IOV, conn->ksnc_rx_kiov, | |
1343 | niov, kiov, offset, mlen); | |
1344 | } | |
1345 | ||
1346 | LASSERT (mlen == | |
1347 | lnet_iov_nob (conn->ksnc_rx_niov, conn->ksnc_rx_iov) + | |
1348 | lnet_kiov_nob (conn->ksnc_rx_nkiov, conn->ksnc_rx_kiov)); | |
1349 | ||
1350 | LASSERT (conn->ksnc_rx_scheduled); | |
1351 | ||
1352 | spin_lock_bh(&sched->kss_lock); | |
1353 | ||
1354 | switch (conn->ksnc_rx_state) { | |
1355 | case SOCKNAL_RX_PARSE_WAIT: | |
1356 | list_add_tail(&conn->ksnc_rx_list, &sched->kss_rx_conns); | |
1357 | wake_up (&sched->kss_waitq); | |
1358 | LASSERT (conn->ksnc_rx_ready); | |
1359 | break; | |
1360 | ||
1361 | case SOCKNAL_RX_PARSE: | |
1362 | /* scheduler hasn't noticed I'm parsing yet */ | |
1363 | break; | |
1364 | } | |
1365 | ||
1366 | conn->ksnc_rx_state = SOCKNAL_RX_LNET_PAYLOAD; | |
1367 | ||
1368 | spin_unlock_bh(&sched->kss_lock); | |
1369 | ksocknal_conn_decref(conn); | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | static inline int | |
1374 | ksocknal_sched_cansleep(ksock_sched_t *sched) | |
1375 | { | |
1376 | int rc; | |
1377 | ||
1378 | spin_lock_bh(&sched->kss_lock); | |
1379 | ||
1380 | rc = (!ksocknal_data.ksnd_shuttingdown && | |
1381 | list_empty(&sched->kss_rx_conns) && | |
1382 | list_empty(&sched->kss_tx_conns)); | |
1383 | ||
1384 | spin_unlock_bh(&sched->kss_lock); | |
1385 | return rc; | |
1386 | } | |
1387 | ||
1388 | int ksocknal_scheduler(void *arg) | |
1389 | { | |
1390 | struct ksock_sched_info *info; | |
1391 | ksock_sched_t *sched; | |
1392 | ksock_conn_t *conn; | |
1393 | ksock_tx_t *tx; | |
1394 | int rc; | |
1395 | int nloops = 0; | |
1396 | long id = (long)arg; | |
1397 | ||
1398 | info = ksocknal_data.ksnd_sched_info[KSOCK_THREAD_CPT(id)]; | |
1399 | sched = &info->ksi_scheds[KSOCK_THREAD_SID(id)]; | |
1400 | ||
1401 | cfs_block_allsigs(); | |
1402 | ||
1403 | rc = cfs_cpt_bind(lnet_cpt_table(), info->ksi_cpt); | |
1404 | if (rc != 0) { | |
1405 | CERROR("Can't set CPT affinity to %d: %d\n", | |
1406 | info->ksi_cpt, rc); | |
1407 | } | |
1408 | ||
1409 | spin_lock_bh(&sched->kss_lock); | |
1410 | ||
1411 | while (!ksocknal_data.ksnd_shuttingdown) { | |
1412 | int did_something = 0; | |
1413 | ||
1414 | /* Ensure I progress everything semi-fairly */ | |
1415 | ||
1416 | if (!list_empty (&sched->kss_rx_conns)) { | |
1417 | conn = list_entry(sched->kss_rx_conns.next, | |
1418 | ksock_conn_t, ksnc_rx_list); | |
1419 | list_del(&conn->ksnc_rx_list); | |
1420 | ||
1421 | LASSERT(conn->ksnc_rx_scheduled); | |
1422 | LASSERT(conn->ksnc_rx_ready); | |
1423 | ||
1424 | /* clear rx_ready in case receive isn't complete. | |
1425 | * Do it BEFORE we call process_recv, since | |
1426 | * data_ready can set it any time after we release | |
1427 | * kss_lock. */ | |
1428 | conn->ksnc_rx_ready = 0; | |
1429 | spin_unlock_bh(&sched->kss_lock); | |
1430 | ||
1431 | rc = ksocknal_process_receive(conn); | |
1432 | ||
1433 | spin_lock_bh(&sched->kss_lock); | |
1434 | ||
1435 | /* I'm the only one that can clear this flag */ | |
1436 | LASSERT(conn->ksnc_rx_scheduled); | |
1437 | ||
1438 | /* Did process_receive get everything it wanted? */ | |
1439 | if (rc == 0) | |
1440 | conn->ksnc_rx_ready = 1; | |
1441 | ||
1442 | if (conn->ksnc_rx_state == SOCKNAL_RX_PARSE) { | |
1443 | /* Conn blocked waiting for ksocknal_recv() | |
1444 | * I change its state (under lock) to signal | |
1445 | * it can be rescheduled */ | |
1446 | conn->ksnc_rx_state = SOCKNAL_RX_PARSE_WAIT; | |
1447 | } else if (conn->ksnc_rx_ready) { | |
1448 | /* reschedule for rx */ | |
1449 | list_add_tail (&conn->ksnc_rx_list, | |
1450 | &sched->kss_rx_conns); | |
1451 | } else { | |
1452 | conn->ksnc_rx_scheduled = 0; | |
1453 | /* drop my ref */ | |
1454 | ksocknal_conn_decref(conn); | |
1455 | } | |
1456 | ||
1457 | did_something = 1; | |
1458 | } | |
1459 | ||
1460 | if (!list_empty (&sched->kss_tx_conns)) { | |
1461 | LIST_HEAD (zlist); | |
1462 | ||
1463 | if (!list_empty(&sched->kss_zombie_noop_txs)) { | |
1464 | list_add(&zlist, | |
1465 | &sched->kss_zombie_noop_txs); | |
1466 | list_del_init(&sched->kss_zombie_noop_txs); | |
1467 | } | |
1468 | ||
1469 | conn = list_entry(sched->kss_tx_conns.next, | |
1470 | ksock_conn_t, ksnc_tx_list); | |
1471 | list_del (&conn->ksnc_tx_list); | |
1472 | ||
1473 | LASSERT(conn->ksnc_tx_scheduled); | |
1474 | LASSERT(conn->ksnc_tx_ready); | |
1475 | LASSERT(!list_empty(&conn->ksnc_tx_queue)); | |
1476 | ||
1477 | tx = list_entry(conn->ksnc_tx_queue.next, | |
1478 | ksock_tx_t, tx_list); | |
1479 | ||
1480 | if (conn->ksnc_tx_carrier == tx) | |
1481 | ksocknal_next_tx_carrier(conn); | |
1482 | ||
1483 | /* dequeue now so empty list => more to send */ | |
1484 | list_del(&tx->tx_list); | |
1485 | ||
1486 | /* Clear tx_ready in case send isn't complete. Do | |
1487 | * it BEFORE we call process_transmit, since | |
1488 | * write_space can set it any time after we release | |
1489 | * kss_lock. */ | |
1490 | conn->ksnc_tx_ready = 0; | |
1491 | spin_unlock_bh(&sched->kss_lock); | |
1492 | ||
1493 | if (!list_empty(&zlist)) { | |
1494 | /* free zombie noop txs, it's fast because | |
1495 | * noop txs are just put in freelist */ | |
1496 | ksocknal_txlist_done(NULL, &zlist, 0); | |
1497 | } | |
1498 | ||
1499 | rc = ksocknal_process_transmit(conn, tx); | |
1500 | ||
1501 | if (rc == -ENOMEM || rc == -EAGAIN) { | |
1502 | /* Incomplete send: replace tx on HEAD of tx_queue */ | |
1503 | spin_lock_bh(&sched->kss_lock); | |
1504 | list_add(&tx->tx_list, | |
1505 | &conn->ksnc_tx_queue); | |
1506 | } else { | |
1507 | /* Complete send; tx -ref */ | |
1508 | ksocknal_tx_decref(tx); | |
1509 | ||
1510 | spin_lock_bh(&sched->kss_lock); | |
1511 | /* assume space for more */ | |
1512 | conn->ksnc_tx_ready = 1; | |
1513 | } | |
1514 | ||
1515 | if (rc == -ENOMEM) { | |
1516 | /* Do nothing; after a short timeout, this | |
1517 | * conn will be reposted on kss_tx_conns. */ | |
1518 | } else if (conn->ksnc_tx_ready && | |
1519 | !list_empty (&conn->ksnc_tx_queue)) { | |
1520 | /* reschedule for tx */ | |
1521 | list_add_tail (&conn->ksnc_tx_list, | |
1522 | &sched->kss_tx_conns); | |
1523 | } else { | |
1524 | conn->ksnc_tx_scheduled = 0; | |
1525 | /* drop my ref */ | |
1526 | ksocknal_conn_decref(conn); | |
1527 | } | |
1528 | ||
1529 | did_something = 1; | |
1530 | } | |
1531 | if (!did_something || /* nothing to do */ | |
1532 | ++nloops == SOCKNAL_RESCHED) { /* hogging CPU? */ | |
1533 | spin_unlock_bh(&sched->kss_lock); | |
1534 | ||
1535 | nloops = 0; | |
1536 | ||
1537 | if (!did_something) { /* wait for something to do */ | |
1538 | cfs_wait_event_interruptible_exclusive( | |
1539 | sched->kss_waitq, | |
1540 | !ksocknal_sched_cansleep(sched), rc); | |
1541 | LASSERT (rc == 0); | |
1542 | } else { | |
1543 | cond_resched(); | |
1544 | } | |
1545 | ||
1546 | spin_lock_bh(&sched->kss_lock); | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | spin_unlock_bh(&sched->kss_lock); | |
1551 | ksocknal_thread_fini(); | |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * Add connection to kss_rx_conns of scheduler | |
1557 | * and wakeup the scheduler. | |
1558 | */ | |
1559 | void ksocknal_read_callback (ksock_conn_t *conn) | |
1560 | { | |
1561 | ksock_sched_t *sched; | |
d7e09d03 PT |
1562 | |
1563 | sched = conn->ksnc_scheduler; | |
1564 | ||
1565 | spin_lock_bh(&sched->kss_lock); | |
1566 | ||
1567 | conn->ksnc_rx_ready = 1; | |
1568 | ||
1569 | if (!conn->ksnc_rx_scheduled) { /* not being progressed */ | |
1570 | list_add_tail(&conn->ksnc_rx_list, | |
1571 | &sched->kss_rx_conns); | |
1572 | conn->ksnc_rx_scheduled = 1; | |
1573 | /* extra ref for scheduler */ | |
1574 | ksocknal_conn_addref(conn); | |
1575 | ||
1576 | wake_up (&sched->kss_waitq); | |
1577 | } | |
1578 | spin_unlock_bh(&sched->kss_lock); | |
d7e09d03 PT |
1579 | } |
1580 | ||
1581 | /* | |
1582 | * Add connection to kss_tx_conns of scheduler | |
1583 | * and wakeup the scheduler. | |
1584 | */ | |
1585 | void ksocknal_write_callback (ksock_conn_t *conn) | |
1586 | { | |
1587 | ksock_sched_t *sched; | |
d7e09d03 PT |
1588 | |
1589 | sched = conn->ksnc_scheduler; | |
1590 | ||
1591 | spin_lock_bh(&sched->kss_lock); | |
1592 | ||
1593 | conn->ksnc_tx_ready = 1; | |
1594 | ||
1595 | if (!conn->ksnc_tx_scheduled && // not being progressed | |
1596 | !list_empty(&conn->ksnc_tx_queue)){//packets to send | |
1597 | list_add_tail (&conn->ksnc_tx_list, | |
1598 | &sched->kss_tx_conns); | |
1599 | conn->ksnc_tx_scheduled = 1; | |
1600 | /* extra ref for scheduler */ | |
1601 | ksocknal_conn_addref(conn); | |
1602 | ||
1603 | wake_up (&sched->kss_waitq); | |
1604 | } | |
1605 | ||
1606 | spin_unlock_bh(&sched->kss_lock); | |
d7e09d03 PT |
1607 | } |
1608 | ||
1609 | ksock_proto_t * | |
1610 | ksocknal_parse_proto_version (ksock_hello_msg_t *hello) | |
1611 | { | |
1612 | __u32 version = 0; | |
1613 | ||
1614 | if (hello->kshm_magic == LNET_PROTO_MAGIC) | |
1615 | version = hello->kshm_version; | |
1616 | else if (hello->kshm_magic == __swab32(LNET_PROTO_MAGIC)) | |
1617 | version = __swab32(hello->kshm_version); | |
1618 | ||
1619 | if (version != 0) { | |
1620 | #if SOCKNAL_VERSION_DEBUG | |
1621 | if (*ksocknal_tunables.ksnd_protocol == 1) | |
1622 | return NULL; | |
1623 | ||
1624 | if (*ksocknal_tunables.ksnd_protocol == 2 && | |
1625 | version == KSOCK_PROTO_V3) | |
1626 | return NULL; | |
1627 | #endif | |
1628 | if (version == KSOCK_PROTO_V2) | |
1629 | return &ksocknal_protocol_v2x; | |
1630 | ||
1631 | if (version == KSOCK_PROTO_V3) | |
1632 | return &ksocknal_protocol_v3x; | |
1633 | ||
1634 | return NULL; | |
1635 | } | |
1636 | ||
1637 | if (hello->kshm_magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) { | |
1638 | lnet_magicversion_t *hmv = (lnet_magicversion_t *)hello; | |
1639 | ||
1640 | CLASSERT (sizeof (lnet_magicversion_t) == | |
1641 | offsetof (ksock_hello_msg_t, kshm_src_nid)); | |
1642 | ||
1643 | if (hmv->version_major == cpu_to_le16 (KSOCK_PROTO_V1_MAJOR) && | |
1644 | hmv->version_minor == cpu_to_le16 (KSOCK_PROTO_V1_MINOR)) | |
1645 | return &ksocknal_protocol_v1x; | |
1646 | } | |
1647 | ||
1648 | return NULL; | |
1649 | } | |
1650 | ||
1651 | int | |
1652 | ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn, | |
1653 | lnet_nid_t peer_nid, ksock_hello_msg_t *hello) | |
1654 | { | |
1655 | /* CAVEAT EMPTOR: this byte flips 'ipaddrs' */ | |
1656 | ksock_net_t *net = (ksock_net_t *)ni->ni_data; | |
1657 | ||
1658 | LASSERT (hello->kshm_nips <= LNET_MAX_INTERFACES); | |
1659 | ||
1660 | /* rely on caller to hold a ref on socket so it wouldn't disappear */ | |
1661 | LASSERT (conn->ksnc_proto != NULL); | |
1662 | ||
1663 | hello->kshm_src_nid = ni->ni_nid; | |
1664 | hello->kshm_dst_nid = peer_nid; | |
1665 | hello->kshm_src_pid = the_lnet.ln_pid; | |
1666 | ||
1667 | hello->kshm_src_incarnation = net->ksnn_incarnation; | |
1668 | hello->kshm_ctype = conn->ksnc_type; | |
1669 | ||
1670 | return conn->ksnc_proto->pro_send_hello(conn, hello); | |
1671 | } | |
1672 | ||
1673 | int | |
1674 | ksocknal_invert_type(int type) | |
1675 | { | |
1676 | switch (type) | |
1677 | { | |
1678 | case SOCKLND_CONN_ANY: | |
1679 | case SOCKLND_CONN_CONTROL: | |
1680 | return (type); | |
1681 | case SOCKLND_CONN_BULK_IN: | |
1682 | return SOCKLND_CONN_BULK_OUT; | |
1683 | case SOCKLND_CONN_BULK_OUT: | |
1684 | return SOCKLND_CONN_BULK_IN; | |
1685 | default: | |
1686 | return (SOCKLND_CONN_NONE); | |
1687 | } | |
1688 | } | |
1689 | ||
1690 | int | |
1691 | ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn, | |
1692 | ksock_hello_msg_t *hello, lnet_process_id_t *peerid, | |
1693 | __u64 *incarnation) | |
1694 | { | |
1695 | /* Return < 0 fatal error | |
1696 | * 0 success | |
1697 | * EALREADY lost connection race | |
1698 | * EPROTO protocol version mismatch | |
1699 | */ | |
1700 | socket_t *sock = conn->ksnc_sock; | |
1701 | int active = (conn->ksnc_proto != NULL); | |
1702 | int timeout; | |
1703 | int proto_match; | |
1704 | int rc; | |
1705 | ksock_proto_t *proto; | |
1706 | lnet_process_id_t recv_id; | |
1707 | ||
1708 | /* socket type set on active connections - not set on passive */ | |
1709 | LASSERT (!active == !(conn->ksnc_type != SOCKLND_CONN_NONE)); | |
1710 | ||
1711 | timeout = active ? *ksocknal_tunables.ksnd_timeout : | |
1712 | lnet_acceptor_timeout(); | |
1713 | ||
1714 | rc = libcfs_sock_read(sock, &hello->kshm_magic, sizeof (hello->kshm_magic), timeout); | |
1715 | if (rc != 0) { | |
5e8f6920 PT |
1716 | CERROR("Error %d reading HELLO from %pI4h\n", |
1717 | rc, &conn->ksnc_ipaddr); | |
d7e09d03 PT |
1718 | LASSERT (rc < 0); |
1719 | return rc; | |
1720 | } | |
1721 | ||
1722 | if (hello->kshm_magic != LNET_PROTO_MAGIC && | |
1723 | hello->kshm_magic != __swab32(LNET_PROTO_MAGIC) && | |
1724 | hello->kshm_magic != le32_to_cpu (LNET_PROTO_TCP_MAGIC)) { | |
1725 | /* Unexpected magic! */ | |
5e8f6920 PT |
1726 | CERROR("Bad magic(1) %#08x (%#08x expected) from " |
1727 | "%pI4h\n", __cpu_to_le32 (hello->kshm_magic), | |
d7e09d03 | 1728 | LNET_PROTO_TCP_MAGIC, |
5e8f6920 | 1729 | &conn->ksnc_ipaddr); |
d7e09d03 PT |
1730 | return -EPROTO; |
1731 | } | |
1732 | ||
1733 | rc = libcfs_sock_read(sock, &hello->kshm_version, | |
1734 | sizeof(hello->kshm_version), timeout); | |
1735 | if (rc != 0) { | |
5e8f6920 PT |
1736 | CERROR("Error %d reading HELLO from %pI4h\n", |
1737 | rc, &conn->ksnc_ipaddr); | |
d7e09d03 PT |
1738 | LASSERT (rc < 0); |
1739 | return rc; | |
1740 | } | |
1741 | ||
1742 | proto = ksocknal_parse_proto_version(hello); | |
1743 | if (proto == NULL) { | |
1744 | if (!active) { | |
1745 | /* unknown protocol from peer, tell peer my protocol */ | |
1746 | conn->ksnc_proto = &ksocknal_protocol_v3x; | |
1747 | #if SOCKNAL_VERSION_DEBUG | |
1748 | if (*ksocknal_tunables.ksnd_protocol == 2) | |
1749 | conn->ksnc_proto = &ksocknal_protocol_v2x; | |
1750 | else if (*ksocknal_tunables.ksnd_protocol == 1) | |
1751 | conn->ksnc_proto = &ksocknal_protocol_v1x; | |
1752 | #endif | |
1753 | hello->kshm_nips = 0; | |
1754 | ksocknal_send_hello(ni, conn, ni->ni_nid, hello); | |
1755 | } | |
1756 | ||
5e8f6920 PT |
1757 | CERROR("Unknown protocol version (%d.x expected)" |
1758 | " from %pI4h\n", | |
d7e09d03 | 1759 | conn->ksnc_proto->pro_version, |
5e8f6920 | 1760 | &conn->ksnc_ipaddr); |
d7e09d03 PT |
1761 | |
1762 | return -EPROTO; | |
1763 | } | |
1764 | ||
1765 | proto_match = (conn->ksnc_proto == proto); | |
1766 | conn->ksnc_proto = proto; | |
1767 | ||
1768 | /* receive the rest of hello message anyway */ | |
1769 | rc = conn->ksnc_proto->pro_recv_hello(conn, hello, timeout); | |
1770 | if (rc != 0) { | |
5e8f6920 PT |
1771 | CERROR("Error %d reading or checking hello from from %pI4h\n", |
1772 | rc, &conn->ksnc_ipaddr); | |
d7e09d03 PT |
1773 | LASSERT (rc < 0); |
1774 | return rc; | |
1775 | } | |
1776 | ||
1777 | *incarnation = hello->kshm_src_incarnation; | |
1778 | ||
1779 | if (hello->kshm_src_nid == LNET_NID_ANY) { | |
1780 | CERROR("Expecting a HELLO hdr with a NID, but got LNET_NID_ANY" | |
5e8f6920 | 1781 | "from %pI4h\n", &conn->ksnc_ipaddr); |
d7e09d03 PT |
1782 | return -EPROTO; |
1783 | } | |
1784 | ||
1785 | if (!active && | |
1786 | conn->ksnc_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) { | |
1787 | /* Userspace NAL assigns peer process ID from socket */ | |
1788 | recv_id.pid = conn->ksnc_port | LNET_PID_USERFLAG; | |
1789 | recv_id.nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), conn->ksnc_ipaddr); | |
1790 | } else { | |
1791 | recv_id.nid = hello->kshm_src_nid; | |
1792 | recv_id.pid = hello->kshm_src_pid; | |
1793 | } | |
1794 | ||
1795 | if (!active) { | |
1796 | *peerid = recv_id; | |
1797 | ||
1798 | /* peer determines type */ | |
1799 | conn->ksnc_type = ksocknal_invert_type(hello->kshm_ctype); | |
1800 | if (conn->ksnc_type == SOCKLND_CONN_NONE) { | |
5e8f6920 | 1801 | CERROR("Unexpected type %d from %s ip %pI4h\n", |
d7e09d03 | 1802 | hello->kshm_ctype, libcfs_id2str(*peerid), |
5e8f6920 | 1803 | &conn->ksnc_ipaddr); |
d7e09d03 PT |
1804 | return -EPROTO; |
1805 | } | |
1806 | ||
1807 | return 0; | |
1808 | } | |
1809 | ||
1810 | if (peerid->pid != recv_id.pid || | |
1811 | peerid->nid != recv_id.nid) { | |
1812 | LCONSOLE_ERROR_MSG(0x130, "Connected successfully to %s on host" | |
5e8f6920 | 1813 | " %pI4h, but they claimed they were " |
d7e09d03 PT |
1814 | "%s; please check your Lustre " |
1815 | "configuration.\n", | |
1816 | libcfs_id2str(*peerid), | |
5e8f6920 | 1817 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
1818 | libcfs_id2str(recv_id)); |
1819 | return -EPROTO; | |
1820 | } | |
1821 | ||
1822 | if (hello->kshm_ctype == SOCKLND_CONN_NONE) { | |
1823 | /* Possible protocol mismatch or I lost the connection race */ | |
1824 | return proto_match ? EALREADY : EPROTO; | |
1825 | } | |
1826 | ||
1827 | if (ksocknal_invert_type(hello->kshm_ctype) != conn->ksnc_type) { | |
5e8f6920 | 1828 | CERROR("Mismatched types: me %d, %s ip %pI4h %d\n", |
d7e09d03 | 1829 | conn->ksnc_type, libcfs_id2str(*peerid), |
5e8f6920 | 1830 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
1831 | hello->kshm_ctype); |
1832 | return -EPROTO; | |
1833 | } | |
1834 | ||
1835 | return 0; | |
1836 | } | |
1837 | ||
1838 | int | |
1839 | ksocknal_connect (ksock_route_t *route) | |
1840 | { | |
1841 | LIST_HEAD (zombies); | |
1842 | ksock_peer_t *peer = route->ksnr_peer; | |
1843 | int type; | |
1844 | int wanted; | |
1845 | socket_t *sock; | |
1846 | cfs_time_t deadline; | |
1847 | int retry_later = 0; | |
1848 | int rc = 0; | |
1849 | ||
1850 | deadline = cfs_time_add(cfs_time_current(), | |
1851 | cfs_time_seconds(*ksocknal_tunables.ksnd_timeout)); | |
1852 | ||
1853 | write_lock_bh(&ksocknal_data.ksnd_global_lock); | |
1854 | ||
1855 | LASSERT (route->ksnr_scheduled); | |
1856 | LASSERT (!route->ksnr_connecting); | |
1857 | ||
1858 | route->ksnr_connecting = 1; | |
1859 | ||
1860 | for (;;) { | |
1861 | wanted = ksocknal_route_mask() & ~route->ksnr_connected; | |
1862 | ||
1863 | /* stop connecting if peer/route got closed under me, or | |
1864 | * route got connected while queued */ | |
1865 | if (peer->ksnp_closing || route->ksnr_deleted || | |
1866 | wanted == 0) { | |
1867 | retry_later = 0; | |
1868 | break; | |
1869 | } | |
1870 | ||
1871 | /* reschedule if peer is connecting to me */ | |
1872 | if (peer->ksnp_accepting > 0) { | |
1873 | CDEBUG(D_NET, | |
1874 | "peer %s(%d) already connecting to me, retry later.\n", | |
1875 | libcfs_nid2str(peer->ksnp_id.nid), peer->ksnp_accepting); | |
1876 | retry_later = 1; | |
1877 | } | |
1878 | ||
1879 | if (retry_later) /* needs reschedule */ | |
1880 | break; | |
1881 | ||
1882 | if ((wanted & (1 << SOCKLND_CONN_ANY)) != 0) { | |
1883 | type = SOCKLND_CONN_ANY; | |
1884 | } else if ((wanted & (1 << SOCKLND_CONN_CONTROL)) != 0) { | |
1885 | type = SOCKLND_CONN_CONTROL; | |
1886 | } else if ((wanted & (1 << SOCKLND_CONN_BULK_IN)) != 0) { | |
1887 | type = SOCKLND_CONN_BULK_IN; | |
1888 | } else { | |
1889 | LASSERT ((wanted & (1 << SOCKLND_CONN_BULK_OUT)) != 0); | |
1890 | type = SOCKLND_CONN_BULK_OUT; | |
1891 | } | |
1892 | ||
1893 | write_unlock_bh(&ksocknal_data.ksnd_global_lock); | |
1894 | ||
1895 | if (cfs_time_aftereq(cfs_time_current(), deadline)) { | |
1896 | rc = -ETIMEDOUT; | |
1897 | lnet_connect_console_error(rc, peer->ksnp_id.nid, | |
1898 | route->ksnr_ipaddr, | |
1899 | route->ksnr_port); | |
1900 | goto failed; | |
1901 | } | |
1902 | ||
1903 | rc = lnet_connect(&sock, peer->ksnp_id.nid, | |
1904 | route->ksnr_myipaddr, | |
1905 | route->ksnr_ipaddr, route->ksnr_port); | |
1906 | if (rc != 0) | |
1907 | goto failed; | |
1908 | ||
1909 | rc = ksocknal_create_conn(peer->ksnp_ni, route, sock, type); | |
1910 | if (rc < 0) { | |
1911 | lnet_connect_console_error(rc, peer->ksnp_id.nid, | |
1912 | route->ksnr_ipaddr, | |
1913 | route->ksnr_port); | |
1914 | goto failed; | |
1915 | } | |
1916 | ||
1917 | /* A +ve RC means I have to retry because I lost the connection | |
1918 | * race or I have to renegotiate protocol version */ | |
1919 | retry_later = (rc != 0); | |
1920 | if (retry_later) | |
1921 | CDEBUG(D_NET, "peer %s: conn race, retry later.\n", | |
1922 | libcfs_nid2str(peer->ksnp_id.nid)); | |
1923 | ||
1924 | write_lock_bh(&ksocknal_data.ksnd_global_lock); | |
1925 | } | |
1926 | ||
1927 | route->ksnr_scheduled = 0; | |
1928 | route->ksnr_connecting = 0; | |
1929 | ||
1930 | if (retry_later) { | |
1931 | /* re-queue for attention; this frees me up to handle | |
1932 | * the peer's incoming connection request */ | |
1933 | ||
1934 | if (rc == EALREADY || | |
1935 | (rc == 0 && peer->ksnp_accepting > 0)) { | |
1936 | /* We want to introduce a delay before next | |
1937 | * attempt to connect if we lost conn race, | |
1938 | * but the race is resolved quickly usually, | |
1939 | * so min_reconnectms should be good heuristic */ | |
1940 | route->ksnr_retry_interval = | |
1941 | cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000; | |
1942 | route->ksnr_timeout = cfs_time_add(cfs_time_current(), | |
1943 | route->ksnr_retry_interval); | |
1944 | } | |
1945 | ||
1946 | ksocknal_launch_connection_locked(route); | |
1947 | } | |
1948 | ||
1949 | write_unlock_bh(&ksocknal_data.ksnd_global_lock); | |
1950 | return retry_later; | |
1951 | ||
1952 | failed: | |
1953 | write_lock_bh(&ksocknal_data.ksnd_global_lock); | |
1954 | ||
1955 | route->ksnr_scheduled = 0; | |
1956 | route->ksnr_connecting = 0; | |
1957 | ||
1958 | /* This is a retry rather than a new connection */ | |
1959 | route->ksnr_retry_interval *= 2; | |
1960 | route->ksnr_retry_interval = | |
1961 | MAX(route->ksnr_retry_interval, | |
1962 | cfs_time_seconds(*ksocknal_tunables.ksnd_min_reconnectms)/1000); | |
1963 | route->ksnr_retry_interval = | |
1964 | MIN(route->ksnr_retry_interval, | |
1965 | cfs_time_seconds(*ksocknal_tunables.ksnd_max_reconnectms)/1000); | |
1966 | ||
1967 | LASSERT (route->ksnr_retry_interval != 0); | |
1968 | route->ksnr_timeout = cfs_time_add(cfs_time_current(), | |
1969 | route->ksnr_retry_interval); | |
1970 | ||
1971 | if (!list_empty(&peer->ksnp_tx_queue) && | |
1972 | peer->ksnp_accepting == 0 && | |
1973 | ksocknal_find_connecting_route_locked(peer) == NULL) { | |
1974 | ksock_conn_t *conn; | |
1975 | ||
1976 | /* ksnp_tx_queue is queued on a conn on successful | |
1977 | * connection for V1.x and V2.x */ | |
1978 | if (!list_empty (&peer->ksnp_conns)) { | |
1979 | conn = list_entry(peer->ksnp_conns.next, | |
1980 | ksock_conn_t, ksnc_list); | |
1981 | LASSERT (conn->ksnc_proto == &ksocknal_protocol_v3x); | |
1982 | } | |
1983 | ||
1984 | /* take all the blocked packets while I've got the lock and | |
1985 | * complete below... */ | |
1986 | list_splice_init(&peer->ksnp_tx_queue, &zombies); | |
1987 | } | |
1988 | ||
2b284326 | 1989 | #if 0 /* irrelevant with only eager routes */ |
d7e09d03 PT |
1990 | if (!route->ksnr_deleted) { |
1991 | /* make this route least-favourite for re-selection */ | |
1992 | list_del(&route->ksnr_list); | |
1993 | list_add_tail(&route->ksnr_list, &peer->ksnp_routes); | |
1994 | } | |
1995 | #endif | |
1996 | write_unlock_bh(&ksocknal_data.ksnd_global_lock); | |
1997 | ||
1998 | ksocknal_peer_failed(peer); | |
1999 | ksocknal_txlist_done(peer->ksnp_ni, &zombies, 1); | |
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | /* | |
2004 | * check whether we need to create more connds. | |
2005 | * It will try to create new thread if it's necessary, @timeout can | |
2006 | * be updated if failed to create, so caller wouldn't keep try while | |
2007 | * running out of resource. | |
2008 | */ | |
2009 | static int | |
2010 | ksocknal_connd_check_start(long sec, long *timeout) | |
2011 | { | |
2012 | char name[16]; | |
2013 | int rc; | |
2014 | int total = ksocknal_data.ksnd_connd_starting + | |
2015 | ksocknal_data.ksnd_connd_running; | |
2016 | ||
2017 | if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) { | |
2018 | /* still in initializing */ | |
2019 | return 0; | |
2020 | } | |
2021 | ||
2022 | if (total >= *ksocknal_tunables.ksnd_nconnds_max || | |
2023 | total > ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV) { | |
2024 | /* can't create more connd, or still have enough | |
2025 | * threads to handle more connecting */ | |
2026 | return 0; | |
2027 | } | |
2028 | ||
2029 | if (list_empty(&ksocknal_data.ksnd_connd_routes)) { | |
2030 | /* no pending connecting request */ | |
2031 | return 0; | |
2032 | } | |
2033 | ||
2034 | if (sec - ksocknal_data.ksnd_connd_failed_stamp <= 1) { | |
2035 | /* may run out of resource, retry later */ | |
2036 | *timeout = cfs_time_seconds(1); | |
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | if (ksocknal_data.ksnd_connd_starting > 0) { | |
2041 | /* serialize starting to avoid flood */ | |
2042 | return 0; | |
2043 | } | |
2044 | ||
2045 | ksocknal_data.ksnd_connd_starting_stamp = sec; | |
2046 | ksocknal_data.ksnd_connd_starting++; | |
2047 | spin_unlock_bh(&ksocknal_data.ksnd_connd_lock); | |
2048 | ||
2049 | /* NB: total is the next id */ | |
2050 | snprintf(name, sizeof(name), "socknal_cd%02d", total); | |
2051 | rc = ksocknal_thread_start(ksocknal_connd, NULL, name); | |
2052 | ||
2053 | spin_lock_bh(&ksocknal_data.ksnd_connd_lock); | |
2054 | if (rc == 0) | |
2055 | return 1; | |
2056 | ||
2057 | /* we tried ... */ | |
2058 | LASSERT(ksocknal_data.ksnd_connd_starting > 0); | |
2059 | ksocknal_data.ksnd_connd_starting--; | |
2060 | ksocknal_data.ksnd_connd_failed_stamp = cfs_time_current_sec(); | |
2061 | ||
2062 | return 1; | |
2063 | } | |
2064 | ||
2065 | /* | |
2066 | * check whether current thread can exit, it will return 1 if there are too | |
2067 | * many threads and no creating in past 120 seconds. | |
2068 | * Also, this function may update @timeout to make caller come back | |
2069 | * again to recheck these conditions. | |
2070 | */ | |
2071 | static int | |
2072 | ksocknal_connd_check_stop(long sec, long *timeout) | |
2073 | { | |
2074 | int val; | |
2075 | ||
2076 | if (unlikely(ksocknal_data.ksnd_init < SOCKNAL_INIT_ALL)) { | |
2077 | /* still in initializing */ | |
2078 | return 0; | |
2079 | } | |
2080 | ||
2081 | if (ksocknal_data.ksnd_connd_starting > 0) { | |
2082 | /* in progress of starting new thread */ | |
2083 | return 0; | |
2084 | } | |
2085 | ||
2086 | if (ksocknal_data.ksnd_connd_running <= | |
2087 | *ksocknal_tunables.ksnd_nconnds) { /* can't shrink */ | |
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | /* created thread in past 120 seconds? */ | |
2092 | val = (int)(ksocknal_data.ksnd_connd_starting_stamp + | |
2093 | SOCKNAL_CONND_TIMEOUT - sec); | |
2094 | ||
2095 | *timeout = (val > 0) ? cfs_time_seconds(val) : | |
2096 | cfs_time_seconds(SOCKNAL_CONND_TIMEOUT); | |
2097 | if (val > 0) | |
2098 | return 0; | |
2099 | ||
2100 | /* no creating in past 120 seconds */ | |
2101 | ||
2102 | return ksocknal_data.ksnd_connd_running > | |
2103 | ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV; | |
2104 | } | |
2105 | ||
2106 | /* Go through connd_routes queue looking for a route that we can process | |
2107 | * right now, @timeout_p can be updated if we need to come back later */ | |
2108 | static ksock_route_t * | |
2109 | ksocknal_connd_get_route_locked(signed long *timeout_p) | |
2110 | { | |
2111 | ksock_route_t *route; | |
2112 | cfs_time_t now; | |
2113 | ||
2114 | now = cfs_time_current(); | |
2115 | ||
2116 | /* connd_routes can contain both pending and ordinary routes */ | |
2117 | list_for_each_entry (route, &ksocknal_data.ksnd_connd_routes, | |
2118 | ksnr_connd_list) { | |
2119 | ||
2120 | if (route->ksnr_retry_interval == 0 || | |
2121 | cfs_time_aftereq(now, route->ksnr_timeout)) | |
2122 | return route; | |
2123 | ||
2124 | if (*timeout_p == MAX_SCHEDULE_TIMEOUT || | |
2125 | (int)*timeout_p > (int)(route->ksnr_timeout - now)) | |
2126 | *timeout_p = (int)(route->ksnr_timeout - now); | |
2127 | } | |
2128 | ||
2129 | return NULL; | |
2130 | } | |
2131 | ||
2132 | int | |
2133 | ksocknal_connd (void *arg) | |
2134 | { | |
2135 | spinlock_t *connd_lock = &ksocknal_data.ksnd_connd_lock; | |
2136 | ksock_connreq_t *cr; | |
2137 | wait_queue_t wait; | |
2138 | int nloops = 0; | |
2139 | int cons_retry = 0; | |
2140 | ||
2141 | cfs_block_allsigs (); | |
2142 | ||
2143 | init_waitqueue_entry_current (&wait); | |
2144 | ||
2145 | spin_lock_bh(connd_lock); | |
2146 | ||
2147 | LASSERT(ksocknal_data.ksnd_connd_starting > 0); | |
2148 | ksocknal_data.ksnd_connd_starting--; | |
2149 | ksocknal_data.ksnd_connd_running++; | |
2150 | ||
2151 | while (!ksocknal_data.ksnd_shuttingdown) { | |
2152 | ksock_route_t *route = NULL; | |
2153 | long sec = cfs_time_current_sec(); | |
2154 | long timeout = MAX_SCHEDULE_TIMEOUT; | |
2155 | int dropped_lock = 0; | |
2156 | ||
2157 | if (ksocknal_connd_check_stop(sec, &timeout)) { | |
2158 | /* wakeup another one to check stop */ | |
2159 | wake_up(&ksocknal_data.ksnd_connd_waitq); | |
2160 | break; | |
2161 | } | |
2162 | ||
2163 | if (ksocknal_connd_check_start(sec, &timeout)) { | |
2164 | /* created new thread */ | |
2165 | dropped_lock = 1; | |
2166 | } | |
2167 | ||
2168 | if (!list_empty(&ksocknal_data.ksnd_connd_connreqs)) { | |
2169 | /* Connection accepted by the listener */ | |
2170 | cr = list_entry(ksocknal_data.ksnd_connd_connreqs. \ | |
2171 | next, ksock_connreq_t, ksncr_list); | |
2172 | ||
2173 | list_del(&cr->ksncr_list); | |
2174 | spin_unlock_bh(connd_lock); | |
2175 | dropped_lock = 1; | |
2176 | ||
2177 | ksocknal_create_conn(cr->ksncr_ni, NULL, | |
2178 | cr->ksncr_sock, SOCKLND_CONN_NONE); | |
2179 | lnet_ni_decref(cr->ksncr_ni); | |
2180 | LIBCFS_FREE(cr, sizeof(*cr)); | |
2181 | ||
2182 | spin_lock_bh(connd_lock); | |
2183 | } | |
2184 | ||
2185 | /* Only handle an outgoing connection request if there | |
2186 | * is a thread left to handle incoming connections and | |
2187 | * create new connd */ | |
2188 | if (ksocknal_data.ksnd_connd_connecting + SOCKNAL_CONND_RESV < | |
2189 | ksocknal_data.ksnd_connd_running) { | |
2190 | route = ksocknal_connd_get_route_locked(&timeout); | |
2191 | } | |
2192 | if (route != NULL) { | |
2193 | list_del (&route->ksnr_connd_list); | |
2194 | ksocknal_data.ksnd_connd_connecting++; | |
2195 | spin_unlock_bh(connd_lock); | |
2196 | dropped_lock = 1; | |
2197 | ||
2198 | if (ksocknal_connect(route)) { | |
2199 | /* consecutive retry */ | |
2200 | if (cons_retry++ > SOCKNAL_INSANITY_RECONN) { | |
2201 | CWARN("massive consecutive " | |
5e8f6920 PT |
2202 | "re-connecting to %pI4h\n", |
2203 | &route->ksnr_ipaddr); | |
d7e09d03 PT |
2204 | cons_retry = 0; |
2205 | } | |
2206 | } else { | |
2207 | cons_retry = 0; | |
2208 | } | |
2209 | ||
2210 | ksocknal_route_decref(route); | |
2211 | ||
2212 | spin_lock_bh(connd_lock); | |
2213 | ksocknal_data.ksnd_connd_connecting--; | |
2214 | } | |
2215 | ||
2216 | if (dropped_lock) { | |
2217 | if (++nloops < SOCKNAL_RESCHED) | |
2218 | continue; | |
2219 | spin_unlock_bh(connd_lock); | |
2220 | nloops = 0; | |
2221 | cond_resched(); | |
2222 | spin_lock_bh(connd_lock); | |
2223 | continue; | |
2224 | } | |
2225 | ||
2226 | /* Nothing to do for 'timeout' */ | |
2227 | set_current_state(TASK_INTERRUPTIBLE); | |
2228 | add_wait_queue_exclusive(&ksocknal_data.ksnd_connd_waitq, &wait); | |
2229 | spin_unlock_bh(connd_lock); | |
2230 | ||
2231 | nloops = 0; | |
2232 | waitq_timedwait(&wait, TASK_INTERRUPTIBLE, timeout); | |
2233 | ||
2234 | set_current_state(TASK_RUNNING); | |
2235 | remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait); | |
2236 | spin_lock_bh(connd_lock); | |
2237 | } | |
2238 | ksocknal_data.ksnd_connd_running--; | |
2239 | spin_unlock_bh(connd_lock); | |
2240 | ||
2241 | ksocknal_thread_fini(); | |
2242 | return 0; | |
2243 | } | |
2244 | ||
2245 | ksock_conn_t * | |
2246 | ksocknal_find_timed_out_conn (ksock_peer_t *peer) | |
2247 | { | |
2248 | /* We're called with a shared lock on ksnd_global_lock */ | |
2249 | ksock_conn_t *conn; | |
2250 | struct list_head *ctmp; | |
2251 | ||
2252 | list_for_each (ctmp, &peer->ksnp_conns) { | |
2253 | int error; | |
2254 | conn = list_entry (ctmp, ksock_conn_t, ksnc_list); | |
2255 | ||
2256 | /* Don't need the {get,put}connsock dance to deref ksnc_sock */ | |
2257 | LASSERT (!conn->ksnc_closing); | |
2258 | ||
2259 | /* SOCK_ERROR will reset error code of socket in | |
2260 | * some platform (like Darwin8.x) */ | |
2261 | error = cfs_sock_error(conn->ksnc_sock); | |
2262 | if (error != 0) { | |
2263 | ksocknal_conn_addref(conn); | |
2264 | ||
2265 | switch (error) { | |
2266 | case ECONNRESET: | |
2267 | CNETERR("A connection with %s " | |
5e8f6920 | 2268 | "(%pI4h:%d) was reset; " |
d7e09d03 PT |
2269 | "it may have rebooted.\n", |
2270 | libcfs_id2str(peer->ksnp_id), | |
5e8f6920 | 2271 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
2272 | conn->ksnc_port); |
2273 | break; | |
2274 | case ETIMEDOUT: | |
2275 | CNETERR("A connection with %s " | |
5e8f6920 | 2276 | "(%pI4h:%d) timed out; the " |
d7e09d03 PT |
2277 | "network or node may be down.\n", |
2278 | libcfs_id2str(peer->ksnp_id), | |
5e8f6920 | 2279 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
2280 | conn->ksnc_port); |
2281 | break; | |
2282 | default: | |
2283 | CNETERR("An unexpected network error %d " | |
2284 | "occurred with %s " | |
5e8f6920 | 2285 | "(%pI4h:%d\n", error, |
d7e09d03 | 2286 | libcfs_id2str(peer->ksnp_id), |
5e8f6920 | 2287 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
2288 | conn->ksnc_port); |
2289 | break; | |
2290 | } | |
2291 | ||
2292 | return (conn); | |
2293 | } | |
2294 | ||
2295 | if (conn->ksnc_rx_started && | |
2296 | cfs_time_aftereq(cfs_time_current(), | |
2297 | conn->ksnc_rx_deadline)) { | |
2298 | /* Timed out incomplete incoming message */ | |
2299 | ksocknal_conn_addref(conn); | |
5e8f6920 | 2300 | CNETERR("Timeout receiving from %s (%pI4h:%d), " |
d7e09d03 PT |
2301 | "state %d wanted %d left %d\n", |
2302 | libcfs_id2str(peer->ksnp_id), | |
5e8f6920 | 2303 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
2304 | conn->ksnc_port, |
2305 | conn->ksnc_rx_state, | |
2306 | conn->ksnc_rx_nob_wanted, | |
2307 | conn->ksnc_rx_nob_left); | |
2308 | return (conn); | |
2309 | } | |
2310 | ||
2311 | if ((!list_empty(&conn->ksnc_tx_queue) || | |
2312 | cfs_sock_wmem_queued(conn->ksnc_sock) != 0) && | |
2313 | cfs_time_aftereq(cfs_time_current(), | |
2314 | conn->ksnc_tx_deadline)) { | |
2315 | /* Timed out messages queued for sending or | |
2316 | * buffered in the socket's send buffer */ | |
2317 | ksocknal_conn_addref(conn); | |
5e8f6920 | 2318 | CNETERR("Timeout sending data to %s (%pI4h:%d) " |
d7e09d03 PT |
2319 | "the network or that node may be down.\n", |
2320 | libcfs_id2str(peer->ksnp_id), | |
5e8f6920 | 2321 | &conn->ksnc_ipaddr, |
d7e09d03 PT |
2322 | conn->ksnc_port); |
2323 | return (conn); | |
2324 | } | |
2325 | } | |
2326 | ||
2327 | return (NULL); | |
2328 | } | |
2329 | ||
2330 | static inline void | |
2331 | ksocknal_flush_stale_txs(ksock_peer_t *peer) | |
2332 | { | |
2333 | ksock_tx_t *tx; | |
2334 | LIST_HEAD (stale_txs); | |
2335 | ||
2336 | write_lock_bh(&ksocknal_data.ksnd_global_lock); | |
2337 | ||
2338 | while (!list_empty (&peer->ksnp_tx_queue)) { | |
2339 | tx = list_entry (peer->ksnp_tx_queue.next, | |
2340 | ksock_tx_t, tx_list); | |
2341 | ||
2342 | if (!cfs_time_aftereq(cfs_time_current(), | |
2343 | tx->tx_deadline)) | |
2344 | break; | |
2345 | ||
2346 | list_del (&tx->tx_list); | |
2347 | list_add_tail (&tx->tx_list, &stale_txs); | |
2348 | } | |
2349 | ||
2350 | write_unlock_bh(&ksocknal_data.ksnd_global_lock); | |
2351 | ||
2352 | ksocknal_txlist_done(peer->ksnp_ni, &stale_txs, 1); | |
2353 | } | |
2354 | ||
2355 | int | |
2356 | ksocknal_send_keepalive_locked(ksock_peer_t *peer) | |
2357 | { | |
2358 | ksock_sched_t *sched; | |
2359 | ksock_conn_t *conn; | |
2360 | ksock_tx_t *tx; | |
2361 | ||
2362 | if (list_empty(&peer->ksnp_conns)) /* last_alive will be updated by create_conn */ | |
2363 | return 0; | |
2364 | ||
2365 | if (peer->ksnp_proto != &ksocknal_protocol_v3x) | |
2366 | return 0; | |
2367 | ||
2368 | if (*ksocknal_tunables.ksnd_keepalive <= 0 || | |
2369 | cfs_time_before(cfs_time_current(), | |
2370 | cfs_time_add(peer->ksnp_last_alive, | |
2371 | cfs_time_seconds(*ksocknal_tunables.ksnd_keepalive)))) | |
2372 | return 0; | |
2373 | ||
2374 | if (cfs_time_before(cfs_time_current(), | |
2375 | peer->ksnp_send_keepalive)) | |
2376 | return 0; | |
2377 | ||
2378 | /* retry 10 secs later, so we wouldn't put pressure | |
2379 | * on this peer if we failed to send keepalive this time */ | |
2380 | peer->ksnp_send_keepalive = cfs_time_shift(10); | |
2381 | ||
2382 | conn = ksocknal_find_conn_locked(peer, NULL, 1); | |
2383 | if (conn != NULL) { | |
2384 | sched = conn->ksnc_scheduler; | |
2385 | ||
2386 | spin_lock_bh(&sched->kss_lock); | |
2387 | if (!list_empty(&conn->ksnc_tx_queue)) { | |
2388 | spin_unlock_bh(&sched->kss_lock); | |
2389 | /* there is an queued ACK, don't need keepalive */ | |
2390 | return 0; | |
2391 | } | |
2392 | ||
2393 | spin_unlock_bh(&sched->kss_lock); | |
2394 | } | |
2395 | ||
2396 | read_unlock(&ksocknal_data.ksnd_global_lock); | |
2397 | ||
2398 | /* cookie = 1 is reserved for keepalive PING */ | |
2399 | tx = ksocknal_alloc_tx_noop(1, 1); | |
2400 | if (tx == NULL) { | |
2401 | read_lock(&ksocknal_data.ksnd_global_lock); | |
2402 | return -ENOMEM; | |
2403 | } | |
2404 | ||
2405 | if (ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id) == 0) { | |
2406 | read_lock(&ksocknal_data.ksnd_global_lock); | |
2407 | return 1; | |
2408 | } | |
2409 | ||
2410 | ksocknal_free_tx(tx); | |
2411 | read_lock(&ksocknal_data.ksnd_global_lock); | |
2412 | ||
2413 | return -EIO; | |
2414 | } | |
2415 | ||
2416 | ||
2417 | void | |
2418 | ksocknal_check_peer_timeouts (int idx) | |
2419 | { | |
2420 | struct list_head *peers = &ksocknal_data.ksnd_peers[idx]; | |
2421 | ksock_peer_t *peer; | |
2422 | ksock_conn_t *conn; | |
2423 | ksock_tx_t *tx; | |
2424 | ||
2425 | again: | |
2426 | /* NB. We expect to have a look at all the peers and not find any | |
2427 | * connections to time out, so we just use a shared lock while we | |
2428 | * take a look... */ | |
2429 | read_lock(&ksocknal_data.ksnd_global_lock); | |
2430 | ||
2431 | list_for_each_entry(peer, peers, ksnp_list) { | |
2432 | cfs_time_t deadline = 0; | |
2433 | int resid = 0; | |
2434 | int n = 0; | |
2435 | ||
2436 | if (ksocknal_send_keepalive_locked(peer) != 0) { | |
2437 | read_unlock(&ksocknal_data.ksnd_global_lock); | |
2438 | goto again; | |
2439 | } | |
2440 | ||
2441 | conn = ksocknal_find_timed_out_conn (peer); | |
2442 | ||
2443 | if (conn != NULL) { | |
2444 | read_unlock(&ksocknal_data.ksnd_global_lock); | |
2445 | ||
2446 | ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT); | |
2447 | ||
2448 | /* NB we won't find this one again, but we can't | |
2449 | * just proceed with the next peer, since we dropped | |
2450 | * ksnd_global_lock and it might be dead already! */ | |
2451 | ksocknal_conn_decref(conn); | |
2452 | goto again; | |
2453 | } | |
2454 | ||
2455 | /* we can't process stale txs right here because we're | |
2456 | * holding only shared lock */ | |
2457 | if (!list_empty (&peer->ksnp_tx_queue)) { | |
2458 | ksock_tx_t *tx = | |
2459 | list_entry (peer->ksnp_tx_queue.next, | |
2460 | ksock_tx_t, tx_list); | |
2461 | ||
2462 | if (cfs_time_aftereq(cfs_time_current(), | |
2463 | tx->tx_deadline)) { | |
2464 | ||
2465 | ksocknal_peer_addref(peer); | |
2466 | read_unlock(&ksocknal_data.ksnd_global_lock); | |
2467 | ||
2468 | ksocknal_flush_stale_txs(peer); | |
2469 | ||
2470 | ksocknal_peer_decref(peer); | |
2471 | goto again; | |
2472 | } | |
2473 | } | |
2474 | ||
2475 | if (list_empty(&peer->ksnp_zc_req_list)) | |
2476 | continue; | |
2477 | ||
2478 | spin_lock(&peer->ksnp_lock); | |
2479 | list_for_each_entry(tx, &peer->ksnp_zc_req_list, tx_zc_list) { | |
2480 | if (!cfs_time_aftereq(cfs_time_current(), | |
2481 | tx->tx_deadline)) | |
2482 | break; | |
2483 | /* ignore the TX if connection is being closed */ | |
2484 | if (tx->tx_conn->ksnc_closing) | |
2485 | continue; | |
2486 | n++; | |
2487 | } | |
2488 | ||
2489 | if (n == 0) { | |
2490 | spin_unlock(&peer->ksnp_lock); | |
2491 | continue; | |
2492 | } | |
2493 | ||
2494 | tx = list_entry(peer->ksnp_zc_req_list.next, | |
2495 | ksock_tx_t, tx_zc_list); | |
2496 | deadline = tx->tx_deadline; | |
2497 | resid = tx->tx_resid; | |
2498 | conn = tx->tx_conn; | |
2499 | ksocknal_conn_addref(conn); | |
2500 | ||
2501 | spin_unlock(&peer->ksnp_lock); | |
2502 | read_unlock(&ksocknal_data.ksnd_global_lock); | |
2503 | ||
2504 | CERROR("Total %d stale ZC_REQs for peer %s detected; the " | |
2505 | "oldest(%p) timed out %ld secs ago, " | |
2506 | "resid: %d, wmem: %d\n", | |
2507 | n, libcfs_nid2str(peer->ksnp_id.nid), tx, | |
2508 | cfs_duration_sec(cfs_time_current() - deadline), | |
2509 | resid, cfs_sock_wmem_queued(conn->ksnc_sock)); | |
2510 | ||
2511 | ksocknal_close_conn_and_siblings (conn, -ETIMEDOUT); | |
2512 | ksocknal_conn_decref(conn); | |
2513 | goto again; | |
2514 | } | |
2515 | ||
2516 | read_unlock(&ksocknal_data.ksnd_global_lock); | |
2517 | } | |
2518 | ||
2519 | int | |
2520 | ksocknal_reaper (void *arg) | |
2521 | { | |
2522 | wait_queue_t wait; | |
2523 | ksock_conn_t *conn; | |
2524 | ksock_sched_t *sched; | |
2525 | struct list_head enomem_conns; | |
2526 | int nenomem_conns; | |
2527 | cfs_duration_t timeout; | |
2528 | int i; | |
2529 | int peer_index = 0; | |
2530 | cfs_time_t deadline = cfs_time_current(); | |
2531 | ||
2532 | cfs_block_allsigs (); | |
2533 | ||
2534 | INIT_LIST_HEAD(&enomem_conns); | |
2535 | init_waitqueue_entry_current (&wait); | |
2536 | ||
2537 | spin_lock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2538 | ||
2539 | while (!ksocknal_data.ksnd_shuttingdown) { | |
2540 | ||
2541 | if (!list_empty (&ksocknal_data.ksnd_deathrow_conns)) { | |
2542 | conn = list_entry (ksocknal_data. \ | |
2543 | ksnd_deathrow_conns.next, | |
2544 | ksock_conn_t, ksnc_list); | |
2545 | list_del (&conn->ksnc_list); | |
2546 | ||
2547 | spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2548 | ||
2549 | ksocknal_terminate_conn(conn); | |
2550 | ksocknal_conn_decref(conn); | |
2551 | ||
2552 | spin_lock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2553 | continue; | |
2554 | } | |
2555 | ||
2556 | if (!list_empty (&ksocknal_data.ksnd_zombie_conns)) { | |
2557 | conn = list_entry (ksocknal_data.ksnd_zombie_conns.\ | |
2558 | next, ksock_conn_t, ksnc_list); | |
2559 | list_del (&conn->ksnc_list); | |
2560 | ||
2561 | spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2562 | ||
2563 | ksocknal_destroy_conn(conn); | |
2564 | ||
2565 | spin_lock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2566 | continue; | |
2567 | } | |
2568 | ||
2569 | if (!list_empty (&ksocknal_data.ksnd_enomem_conns)) { | |
2570 | list_add(&enomem_conns, | |
2571 | &ksocknal_data.ksnd_enomem_conns); | |
2572 | list_del_init(&ksocknal_data.ksnd_enomem_conns); | |
2573 | } | |
2574 | ||
2575 | spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2576 | ||
2577 | /* reschedule all the connections that stalled with ENOMEM... */ | |
2578 | nenomem_conns = 0; | |
2579 | while (!list_empty (&enomem_conns)) { | |
2580 | conn = list_entry (enomem_conns.next, | |
2581 | ksock_conn_t, ksnc_tx_list); | |
2582 | list_del (&conn->ksnc_tx_list); | |
2583 | ||
2584 | sched = conn->ksnc_scheduler; | |
2585 | ||
2586 | spin_lock_bh(&sched->kss_lock); | |
2587 | ||
2588 | LASSERT(conn->ksnc_tx_scheduled); | |
2589 | conn->ksnc_tx_ready = 1; | |
2590 | list_add_tail(&conn->ksnc_tx_list, | |
2591 | &sched->kss_tx_conns); | |
2592 | wake_up(&sched->kss_waitq); | |
2593 | ||
2594 | spin_unlock_bh(&sched->kss_lock); | |
2595 | nenomem_conns++; | |
2596 | } | |
2597 | ||
2598 | /* careful with the jiffy wrap... */ | |
2599 | while ((timeout = cfs_time_sub(deadline, | |
2600 | cfs_time_current())) <= 0) { | |
2601 | const int n = 4; | |
2602 | const int p = 1; | |
2603 | int chunk = ksocknal_data.ksnd_peer_hash_size; | |
2604 | ||
2605 | /* Time to check for timeouts on a few more peers: I do | |
2606 | * checks every 'p' seconds on a proportion of the peer | |
2607 | * table and I need to check every connection 'n' times | |
2608 | * within a timeout interval, to ensure I detect a | |
2609 | * timeout on any connection within (n+1)/n times the | |
2610 | * timeout interval. */ | |
2611 | ||
2612 | if (*ksocknal_tunables.ksnd_timeout > n * p) | |
2613 | chunk = (chunk * n * p) / | |
2614 | *ksocknal_tunables.ksnd_timeout; | |
2615 | if (chunk == 0) | |
2616 | chunk = 1; | |
2617 | ||
2618 | for (i = 0; i < chunk; i++) { | |
2619 | ksocknal_check_peer_timeouts (peer_index); | |
2620 | peer_index = (peer_index + 1) % | |
2621 | ksocknal_data.ksnd_peer_hash_size; | |
2622 | } | |
2623 | ||
2624 | deadline = cfs_time_add(deadline, cfs_time_seconds(p)); | |
2625 | } | |
2626 | ||
2627 | if (nenomem_conns != 0) { | |
2628 | /* Reduce my timeout if I rescheduled ENOMEM conns. | |
2629 | * This also prevents me getting woken immediately | |
2630 | * if any go back on my enomem list. */ | |
2631 | timeout = SOCKNAL_ENOMEM_RETRY; | |
2632 | } | |
2633 | ksocknal_data.ksnd_reaper_waketime = | |
2634 | cfs_time_add(cfs_time_current(), timeout); | |
2635 | ||
2636 | set_current_state (TASK_INTERRUPTIBLE); | |
2637 | add_wait_queue (&ksocknal_data.ksnd_reaper_waitq, &wait); | |
2638 | ||
2639 | if (!ksocknal_data.ksnd_shuttingdown && | |
2640 | list_empty (&ksocknal_data.ksnd_deathrow_conns) && | |
2641 | list_empty (&ksocknal_data.ksnd_zombie_conns)) | |
2642 | waitq_timedwait (&wait, TASK_INTERRUPTIBLE, | |
2643 | timeout); | |
2644 | ||
2645 | set_current_state (TASK_RUNNING); | |
2646 | remove_wait_queue (&ksocknal_data.ksnd_reaper_waitq, &wait); | |
2647 | ||
2648 | spin_lock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2649 | } | |
2650 | ||
2651 | spin_unlock_bh(&ksocknal_data.ksnd_reaper_lock); | |
2652 | ||
2653 | ksocknal_thread_fini(); | |
2654 | return 0; | |
2655 | } |