1 /*
2 * net engine
3 *
4 * IO engine that reads/writes to/from sockets.
5 *
6 */
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <unistd.h>
10 #include <signal.h>
11 #include <errno.h>
12 #include <assert.h>
13 #include <netinet/in.h>
14 #include <netinet/tcp.h>
15 #include <arpa/inet.h>
16 #include <netdb.h>
17 #include <sys/poll.h>
18 #include <sys/types.h>
19 #include <sys/stat.h>
20 #include <sys/socket.h>
21 #include <sys/un.h>
22
23 #include "../fio.h"
24 #include "../verify.h"
25 #include "../optgroup.h"
26
27 struct netio_data {
28 int listenfd;
29 int use_splice;
30 int seq_off;
31 int pipes[2];
32 struct sockaddr_in addr;
33 struct sockaddr_in6 addr6;
34 struct sockaddr_un addr_un;
35 uint64_t udp_send_seq;
36 uint64_t udp_recv_seq;
37 };
38
39 struct netio_options {
40 struct thread_data *td;
41 unsigned int port;
42 unsigned int proto;
43 unsigned int listen;
44 unsigned int pingpong;
45 unsigned int nodelay;
46 unsigned int ttl;
47 unsigned int window_size;
48 unsigned int mss;
49 char *intfc;
50 };
51
52 struct udp_close_msg {
53 uint32_t magic;
54 uint32_t cmd;
55 };
56
57 struct udp_seq {
58 uint64_t magic;
59 uint64_t seq;
60 uint64_t bs;
61 };
62
63 enum {
64 FIO_LINK_CLOSE = 0x89,
65 FIO_LINK_OPEN_CLOSE_MAGIC = 0x6c696e6b,
66 FIO_LINK_OPEN = 0x98,
67 FIO_UDP_SEQ_MAGIC = 0x657375716e556563ULL,
68
69 FIO_TYPE_TCP = 1,
70 FIO_TYPE_UDP = 2,
71 FIO_TYPE_UNIX = 3,
72 FIO_TYPE_TCP_V6 = 4,
73 FIO_TYPE_UDP_V6 = 5,
74 };
75
76 static int str_hostname_cb(void *data, const char *input);
77 static struct fio_option options[] = {
78 {
79 .name = "hostname",
80 .lname = "net engine hostname",
81 .type = FIO_OPT_STR_STORE,
82 .cb = str_hostname_cb,
83 .help = "Hostname for net IO engine",
84 .category = FIO_OPT_C_ENGINE,
85 .group = FIO_OPT_G_NETIO,
86 },
87 {
88 .name = "port",
89 .lname = "net engine port",
90 .type = FIO_OPT_INT,
91 .off1 = offsetof(struct netio_options, port),
92 .minval = 1,
93 .maxval = 65535,
94 .help = "Port to use for TCP or UDP net connections",
95 .category = FIO_OPT_C_ENGINE,
96 .group = FIO_OPT_G_NETIO,
97 },
98 {
99 .name = "protocol",
100 .lname = "net engine protocol",
101 .alias = "proto",
102 .type = FIO_OPT_STR,
103 .off1 = offsetof(struct netio_options, proto),
104 .help = "Network protocol to use",
105 .def = "tcp",
106 .posval = {
107 { .ival = "tcp",
108 .oval = FIO_TYPE_TCP,
109 .help = "Transmission Control Protocol",
110 },
111 #ifdef CONFIG_IPV6
112 { .ival = "tcpv6",
113 .oval = FIO_TYPE_TCP_V6,
114 .help = "Transmission Control Protocol V6",
115 },
116 #endif
117 { .ival = "udp",
118 .oval = FIO_TYPE_UDP,
119 .help = "User Datagram Protocol",
120 },
121 #ifdef CONFIG_IPV6
122 { .ival = "udpv6",
123 .oval = FIO_TYPE_UDP_V6,
124 .help = "User Datagram Protocol V6",
125 },
126 #endif
127 { .ival = "unix",
128 .oval = FIO_TYPE_UNIX,
129 .help = "UNIX domain socket",
130 },
131 },
132 .category = FIO_OPT_C_ENGINE,
133 .group = FIO_OPT_G_NETIO,
134 },
135 #ifdef CONFIG_TCP_NODELAY
136 {
137 .name = "nodelay",
138 .lname = "No Delay",
139 .type = FIO_OPT_BOOL,
140 .off1 = offsetof(struct netio_options, nodelay),
141 .help = "Use TCP_NODELAY on TCP connections",
142 .category = FIO_OPT_C_ENGINE,
143 .group = FIO_OPT_G_NETIO,
144 },
145 #endif
146 {
147 .name = "listen",
148 .lname = "net engine listen",
149 .type = FIO_OPT_STR_SET,
150 .off1 = offsetof(struct netio_options, listen),
151 .help = "Listen for incoming TCP connections",
152 .category = FIO_OPT_C_ENGINE,
153 .group = FIO_OPT_G_NETIO,
154 },
155 {
156 .name = "pingpong",
157 .lname = "Ping Pong",
158 .type = FIO_OPT_STR_SET,
159 .off1 = offsetof(struct netio_options, pingpong),
160 .help = "Ping-pong IO requests",
161 .category = FIO_OPT_C_ENGINE,
162 .group = FIO_OPT_G_NETIO,
163 },
164 {
165 .name = "interface",
166 .lname = "net engine interface",
167 .type = FIO_OPT_STR_STORE,
168 .off1 = offsetof(struct netio_options, intfc),
169 .help = "Network interface to use",
170 .category = FIO_OPT_C_ENGINE,
171 .group = FIO_OPT_G_NETIO,
172 },
173 {
174 .name = "ttl",
175 .lname = "net engine multicast ttl",
176 .type = FIO_OPT_INT,
177 .off1 = offsetof(struct netio_options, ttl),
178 .def = "1",
179 .minval = 0,
180 .help = "Time-to-live value for outgoing UDP multicast packets",
181 .category = FIO_OPT_C_ENGINE,
182 .group = FIO_OPT_G_NETIO,
183 },
184 #ifdef CONFIG_NET_WINDOWSIZE
185 {
186 .name = "window_size",
187 .lname = "Window Size",
188 .type = FIO_OPT_INT,
189 .off1 = offsetof(struct netio_options, window_size),
190 .minval = 0,
191 .help = "Set socket buffer window size",
192 .category = FIO_OPT_C_ENGINE,
193 .group = FIO_OPT_G_NETIO,
194 },
195 #endif
196 #ifdef CONFIG_NET_MSS
197 {
198 .name = "mss",
199 .lname = "Maximum segment size",
200 .type = FIO_OPT_INT,
201 .off1 = offsetof(struct netio_options, mss),
202 .minval = 0,
203 .help = "Set TCP maximum segment size",
204 .category = FIO_OPT_C_ENGINE,
205 .group = FIO_OPT_G_NETIO,
206 },
207 #endif
208 {
209 .name = NULL,
210 },
211 };
212
is_udp(struct netio_options * o)213 static inline int is_udp(struct netio_options *o)
214 {
215 return o->proto == FIO_TYPE_UDP || o->proto == FIO_TYPE_UDP_V6;
216 }
217
is_tcp(struct netio_options * o)218 static inline int is_tcp(struct netio_options *o)
219 {
220 return o->proto == FIO_TYPE_TCP || o->proto == FIO_TYPE_TCP_V6;
221 }
222
is_ipv6(struct netio_options * o)223 static inline int is_ipv6(struct netio_options *o)
224 {
225 return o->proto == FIO_TYPE_UDP_V6 || o->proto == FIO_TYPE_TCP_V6;
226 }
227
set_window_size(struct thread_data * td,int fd)228 static int set_window_size(struct thread_data *td, int fd)
229 {
230 #ifdef CONFIG_NET_WINDOWSIZE
231 struct netio_options *o = td->eo;
232 unsigned int wss;
233 int snd, rcv, ret;
234
235 if (!o->window_size)
236 return 0;
237
238 rcv = o->listen || o->pingpong;
239 snd = !o->listen || o->pingpong;
240 wss = o->window_size;
241 ret = 0;
242
243 if (rcv) {
244 ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (void *) &wss,
245 sizeof(wss));
246 if (ret < 0)
247 td_verror(td, errno, "rcvbuf window size");
248 }
249 if (snd && !ret) {
250 ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (void *) &wss,
251 sizeof(wss));
252 if (ret < 0)
253 td_verror(td, errno, "sndbuf window size");
254 }
255
256 return ret;
257 #else
258 td_verror(td, -EINVAL, "setsockopt window size");
259 return -1;
260 #endif
261 }
262
set_mss(struct thread_data * td,int fd)263 static int set_mss(struct thread_data *td, int fd)
264 {
265 #ifdef CONFIG_NET_MSS
266 struct netio_options *o = td->eo;
267 unsigned int mss;
268 int ret;
269
270 if (!o->mss || !is_tcp(o))
271 return 0;
272
273 mss = o->mss;
274 ret = setsockopt(fd, IPPROTO_TCP, TCP_MAXSEG, (void *) &mss,
275 sizeof(mss));
276 if (ret < 0)
277 td_verror(td, errno, "setsockopt TCP_MAXSEG");
278
279 return ret;
280 #else
281 td_verror(td, -EINVAL, "setsockopt TCP_MAXSEG");
282 return -1;
283 #endif
284 }
285
286
287 /*
288 * Return -1 for error and 'nr events' for a positive number
289 * of events
290 */
poll_wait(struct thread_data * td,int fd,short events)291 static int poll_wait(struct thread_data *td, int fd, short events)
292 {
293 struct pollfd pfd;
294 int ret;
295
296 while (!td->terminate) {
297 pfd.fd = fd;
298 pfd.events = events;
299 ret = poll(&pfd, 1, -1);
300 if (ret < 0) {
301 if (errno == EINTR)
302 break;
303
304 td_verror(td, errno, "poll");
305 return -1;
306 } else if (!ret)
307 continue;
308
309 break;
310 }
311
312 if (pfd.revents & events)
313 return 1;
314
315 return -1;
316 }
317
fio_netio_is_multicast(const char * mcaddr)318 static int fio_netio_is_multicast(const char *mcaddr)
319 {
320 in_addr_t addr = inet_network(mcaddr);
321 if (addr == -1)
322 return 0;
323
324 if (inet_network("224.0.0.0") <= addr &&
325 inet_network("239.255.255.255") >= addr)
326 return 1;
327
328 return 0;
329 }
330
331
fio_netio_prep(struct thread_data * td,struct io_u * io_u)332 static int fio_netio_prep(struct thread_data *td, struct io_u *io_u)
333 {
334 struct netio_options *o = td->eo;
335
336 /*
337 * Make sure we don't see spurious reads to a receiver, and vice versa
338 */
339 if (is_tcp(o))
340 return 0;
341
342 if ((o->listen && io_u->ddir == DDIR_WRITE) ||
343 (!o->listen && io_u->ddir == DDIR_READ)) {
344 td_verror(td, EINVAL, "bad direction");
345 return 1;
346 }
347
348 return 0;
349 }
350
351 #ifdef CONFIG_LINUX_SPLICE
splice_io_u(int fdin,int fdout,unsigned int len)352 static int splice_io_u(int fdin, int fdout, unsigned int len)
353 {
354 int bytes = 0;
355
356 while (len) {
357 int ret = splice(fdin, NULL, fdout, NULL, len, 0);
358
359 if (ret < 0) {
360 if (!bytes)
361 bytes = ret;
362
363 break;
364 } else if (!ret)
365 break;
366
367 bytes += ret;
368 len -= ret;
369 }
370
371 return bytes;
372 }
373
374 /*
375 * Receive bytes from a socket and fill them into the internal pipe
376 */
splice_in(struct thread_data * td,struct io_u * io_u)377 static int splice_in(struct thread_data *td, struct io_u *io_u)
378 {
379 struct netio_data *nd = td->io_ops_data;
380
381 return splice_io_u(io_u->file->fd, nd->pipes[1], io_u->xfer_buflen);
382 }
383
384 /*
385 * Transmit 'len' bytes from the internal pipe
386 */
splice_out(struct thread_data * td,struct io_u * io_u,unsigned int len)387 static int splice_out(struct thread_data *td, struct io_u *io_u,
388 unsigned int len)
389 {
390 struct netio_data *nd = td->io_ops_data;
391
392 return splice_io_u(nd->pipes[0], io_u->file->fd, len);
393 }
394
vmsplice_io_u(struct io_u * io_u,int fd,unsigned int len)395 static int vmsplice_io_u(struct io_u *io_u, int fd, unsigned int len)
396 {
397 struct iovec iov = {
398 .iov_base = io_u->xfer_buf,
399 .iov_len = len,
400 };
401 int bytes = 0;
402
403 while (iov.iov_len) {
404 int ret = vmsplice(fd, &iov, 1, SPLICE_F_MOVE);
405
406 if (ret < 0) {
407 if (!bytes)
408 bytes = ret;
409 break;
410 } else if (!ret)
411 break;
412
413 iov.iov_len -= ret;
414 iov.iov_base += ret;
415 bytes += ret;
416 }
417
418 return bytes;
419
420 }
421
422 /*
423 * vmsplice() pipe to io_u buffer
424 */
vmsplice_io_u_out(struct thread_data * td,struct io_u * io_u,unsigned int len)425 static int vmsplice_io_u_out(struct thread_data *td, struct io_u *io_u,
426 unsigned int len)
427 {
428 struct netio_data *nd = td->io_ops_data;
429
430 return vmsplice_io_u(io_u, nd->pipes[0], len);
431 }
432
433 /*
434 * vmsplice() io_u to pipe
435 */
vmsplice_io_u_in(struct thread_data * td,struct io_u * io_u)436 static int vmsplice_io_u_in(struct thread_data *td, struct io_u *io_u)
437 {
438 struct netio_data *nd = td->io_ops_data;
439
440 return vmsplice_io_u(io_u, nd->pipes[1], io_u->xfer_buflen);
441 }
442
443 /*
444 * splice receive - transfer socket data into a pipe using splice, then map
445 * that pipe data into the io_u using vmsplice.
446 */
fio_netio_splice_in(struct thread_data * td,struct io_u * io_u)447 static int fio_netio_splice_in(struct thread_data *td, struct io_u *io_u)
448 {
449 int ret;
450
451 ret = splice_in(td, io_u);
452 if (ret > 0)
453 return vmsplice_io_u_out(td, io_u, ret);
454
455 return ret;
456 }
457
458 /*
459 * splice transmit - map data from the io_u into a pipe by using vmsplice,
460 * then transfer that pipe to a socket using splice.
461 */
fio_netio_splice_out(struct thread_data * td,struct io_u * io_u)462 static int fio_netio_splice_out(struct thread_data *td, struct io_u *io_u)
463 {
464 int ret;
465
466 ret = vmsplice_io_u_in(td, io_u);
467 if (ret > 0)
468 return splice_out(td, io_u, ret);
469
470 return ret;
471 }
472 #else
fio_netio_splice_in(struct thread_data * td,struct io_u * io_u)473 static int fio_netio_splice_in(struct thread_data *td, struct io_u *io_u)
474 {
475 errno = EOPNOTSUPP;
476 return -1;
477 }
478
fio_netio_splice_out(struct thread_data * td,struct io_u * io_u)479 static int fio_netio_splice_out(struct thread_data *td, struct io_u *io_u)
480 {
481 errno = EOPNOTSUPP;
482 return -1;
483 }
484 #endif
485
store_udp_seq(struct netio_data * nd,struct io_u * io_u)486 static void store_udp_seq(struct netio_data *nd, struct io_u *io_u)
487 {
488 struct udp_seq *us;
489
490 if (io_u->xfer_buflen < sizeof(*us))
491 return;
492
493 us = io_u->xfer_buf + io_u->xfer_buflen - sizeof(*us);
494 us->magic = cpu_to_le64((uint64_t) FIO_UDP_SEQ_MAGIC);
495 us->bs = cpu_to_le64((uint64_t) io_u->xfer_buflen);
496 us->seq = cpu_to_le64(nd->udp_send_seq++);
497 }
498
verify_udp_seq(struct thread_data * td,struct netio_data * nd,struct io_u * io_u)499 static void verify_udp_seq(struct thread_data *td, struct netio_data *nd,
500 struct io_u *io_u)
501 {
502 struct udp_seq *us;
503 uint64_t seq;
504
505 if (io_u->xfer_buflen < sizeof(*us))
506 return;
507
508 if (nd->seq_off)
509 return;
510
511 us = io_u->xfer_buf + io_u->xfer_buflen - sizeof(*us);
512 if (le64_to_cpu(us->magic) != FIO_UDP_SEQ_MAGIC)
513 return;
514 if (le64_to_cpu(us->bs) != io_u->xfer_buflen) {
515 nd->seq_off = 1;
516 return;
517 }
518
519 seq = le64_to_cpu(us->seq);
520
521 if (seq != nd->udp_recv_seq)
522 td->ts.drop_io_u[io_u->ddir] += seq - nd->udp_recv_seq;
523
524 nd->udp_recv_seq = seq + 1;
525 }
526
fio_netio_send(struct thread_data * td,struct io_u * io_u)527 static int fio_netio_send(struct thread_data *td, struct io_u *io_u)
528 {
529 struct netio_data *nd = td->io_ops_data;
530 struct netio_options *o = td->eo;
531 int ret, flags = 0;
532
533 do {
534 if (is_udp(o)) {
535 const struct sockaddr *to;
536 socklen_t len;
537
538 if (is_ipv6(o)) {
539 to = (struct sockaddr *) &nd->addr6;
540 len = sizeof(nd->addr6);
541 } else {
542 to = (struct sockaddr *) &nd->addr;
543 len = sizeof(nd->addr);
544 }
545
546 if (td->o.verify == VERIFY_NONE)
547 store_udp_seq(nd, io_u);
548
549 ret = sendto(io_u->file->fd, io_u->xfer_buf,
550 io_u->xfer_buflen, flags, to, len);
551 } else {
552 /*
553 * if we are going to write more, set MSG_MORE
554 */
555 #ifdef MSG_MORE
556 if ((td->this_io_bytes[DDIR_WRITE] + io_u->xfer_buflen <
557 td->o.size) && !o->pingpong)
558 flags |= MSG_MORE;
559 #endif
560 ret = send(io_u->file->fd, io_u->xfer_buf,
561 io_u->xfer_buflen, flags);
562 }
563 if (ret > 0)
564 break;
565
566 ret = poll_wait(td, io_u->file->fd, POLLOUT);
567 if (ret <= 0)
568 break;
569 } while (1);
570
571 return ret;
572 }
573
is_close_msg(struct io_u * io_u,int len)574 static int is_close_msg(struct io_u *io_u, int len)
575 {
576 struct udp_close_msg *msg;
577
578 if (len != sizeof(struct udp_close_msg))
579 return 0;
580
581 msg = io_u->xfer_buf;
582 if (le32_to_cpu(msg->magic) != FIO_LINK_OPEN_CLOSE_MAGIC)
583 return 0;
584 if (le32_to_cpu(msg->cmd) != FIO_LINK_CLOSE)
585 return 0;
586
587 return 1;
588 }
589
fio_netio_recv(struct thread_data * td,struct io_u * io_u)590 static int fio_netio_recv(struct thread_data *td, struct io_u *io_u)
591 {
592 struct netio_data *nd = td->io_ops_data;
593 struct netio_options *o = td->eo;
594 int ret, flags = 0;
595
596 do {
597 if (is_udp(o)) {
598 struct sockaddr *from;
599 socklen_t l, *len = &l;
600
601 if (o->listen) {
602 if (!is_ipv6(o)) {
603 from = (struct sockaddr *) &nd->addr;
604 *len = sizeof(nd->addr);
605 } else {
606 from = (struct sockaddr *) &nd->addr6;
607 *len = sizeof(nd->addr6);
608 }
609 } else {
610 from = NULL;
611 len = NULL;
612 }
613
614 ret = recvfrom(io_u->file->fd, io_u->xfer_buf,
615 io_u->xfer_buflen, flags, from, len);
616
617 if (is_close_msg(io_u, ret)) {
618 td->done = 1;
619 return 0;
620 }
621 } else {
622 ret = recv(io_u->file->fd, io_u->xfer_buf,
623 io_u->xfer_buflen, flags);
624
625 if (is_close_msg(io_u, ret)) {
626 td->done = 1;
627 return 0;
628 }
629 }
630 if (ret > 0)
631 break;
632 else if (!ret && (flags & MSG_WAITALL))
633 break;
634
635 ret = poll_wait(td, io_u->file->fd, POLLIN);
636 if (ret <= 0)
637 break;
638 flags |= MSG_WAITALL;
639 } while (1);
640
641 if (is_udp(o) && td->o.verify == VERIFY_NONE)
642 verify_udp_seq(td, nd, io_u);
643
644 return ret;
645 }
646
__fio_netio_queue(struct thread_data * td,struct io_u * io_u,enum fio_ddir ddir)647 static int __fio_netio_queue(struct thread_data *td, struct io_u *io_u,
648 enum fio_ddir ddir)
649 {
650 struct netio_data *nd = td->io_ops_data;
651 struct netio_options *o = td->eo;
652 int ret;
653
654 if (ddir == DDIR_WRITE) {
655 if (!nd->use_splice || is_udp(o) ||
656 o->proto == FIO_TYPE_UNIX)
657 ret = fio_netio_send(td, io_u);
658 else
659 ret = fio_netio_splice_out(td, io_u);
660 } else if (ddir == DDIR_READ) {
661 if (!nd->use_splice || is_udp(o) ||
662 o->proto == FIO_TYPE_UNIX)
663 ret = fio_netio_recv(td, io_u);
664 else
665 ret = fio_netio_splice_in(td, io_u);
666 } else
667 ret = 0; /* must be a SYNC */
668
669 if (ret != (int) io_u->xfer_buflen) {
670 if (ret > 0) {
671 io_u->resid = io_u->xfer_buflen - ret;
672 io_u->error = 0;
673 return FIO_Q_COMPLETED;
674 } else if (!ret)
675 return FIO_Q_BUSY;
676 else {
677 int err = errno;
678
679 if (ddir == DDIR_WRITE && err == EMSGSIZE)
680 return FIO_Q_BUSY;
681
682 io_u->error = err;
683 }
684 }
685
686 if (io_u->error)
687 td_verror(td, io_u->error, "xfer");
688
689 return FIO_Q_COMPLETED;
690 }
691
fio_netio_queue(struct thread_data * td,struct io_u * io_u)692 static int fio_netio_queue(struct thread_data *td, struct io_u *io_u)
693 {
694 struct netio_options *o = td->eo;
695 int ret;
696
697 fio_ro_check(td, io_u);
698
699 ret = __fio_netio_queue(td, io_u, io_u->ddir);
700 if (!o->pingpong || ret != FIO_Q_COMPLETED)
701 return ret;
702
703 /*
704 * For ping-pong mode, receive or send reply as needed
705 */
706 if (td_read(td) && io_u->ddir == DDIR_READ)
707 ret = __fio_netio_queue(td, io_u, DDIR_WRITE);
708 else if (td_write(td) && io_u->ddir == DDIR_WRITE)
709 ret = __fio_netio_queue(td, io_u, DDIR_READ);
710
711 return ret;
712 }
713
fio_netio_connect(struct thread_data * td,struct fio_file * f)714 static int fio_netio_connect(struct thread_data *td, struct fio_file *f)
715 {
716 struct netio_data *nd = td->io_ops_data;
717 struct netio_options *o = td->eo;
718 int type, domain;
719
720 if (o->proto == FIO_TYPE_TCP) {
721 domain = AF_INET;
722 type = SOCK_STREAM;
723 } else if (o->proto == FIO_TYPE_TCP_V6) {
724 domain = AF_INET6;
725 type = SOCK_STREAM;
726 } else if (o->proto == FIO_TYPE_UDP) {
727 domain = AF_INET;
728 type = SOCK_DGRAM;
729 } else if (o->proto == FIO_TYPE_UDP_V6) {
730 domain = AF_INET6;
731 type = SOCK_DGRAM;
732 } else if (o->proto == FIO_TYPE_UNIX) {
733 domain = AF_UNIX;
734 type = SOCK_STREAM;
735 } else {
736 log_err("fio: bad network type %d\n", o->proto);
737 f->fd = -1;
738 return 1;
739 }
740
741 f->fd = socket(domain, type, 0);
742 if (f->fd < 0) {
743 td_verror(td, errno, "socket");
744 return 1;
745 }
746
747 #ifdef CONFIG_TCP_NODELAY
748 if (o->nodelay && is_tcp(o)) {
749 int optval = 1;
750
751 if (setsockopt(f->fd, IPPROTO_TCP, TCP_NODELAY, (void *) &optval, sizeof(int)) < 0) {
752 log_err("fio: cannot set TCP_NODELAY option on socket (%s), disable with 'nodelay=0'\n", strerror(errno));
753 return 1;
754 }
755 }
756 #endif
757
758 if (set_window_size(td, f->fd)) {
759 close(f->fd);
760 return 1;
761 }
762 if (set_mss(td, f->fd)) {
763 close(f->fd);
764 return 1;
765 }
766
767 if (is_udp(o)) {
768 if (!fio_netio_is_multicast(td->o.filename))
769 return 0;
770 if (is_ipv6(o)) {
771 log_err("fio: multicast not supported on IPv6\n");
772 close(f->fd);
773 return 1;
774 }
775
776 if (o->intfc) {
777 struct in_addr interface_addr;
778
779 if (inet_aton(o->intfc, &interface_addr) == 0) {
780 log_err("fio: interface not valid interface IP\n");
781 close(f->fd);
782 return 1;
783 }
784 if (setsockopt(f->fd, IPPROTO_IP, IP_MULTICAST_IF, (const char*)&interface_addr, sizeof(interface_addr)) < 0) {
785 td_verror(td, errno, "setsockopt IP_MULTICAST_IF");
786 close(f->fd);
787 return 1;
788 }
789 }
790 if (setsockopt(f->fd, IPPROTO_IP, IP_MULTICAST_TTL, (const char*)&o->ttl, sizeof(o->ttl)) < 0) {
791 td_verror(td, errno, "setsockopt IP_MULTICAST_TTL");
792 close(f->fd);
793 return 1;
794 }
795 return 0;
796 } else if (o->proto == FIO_TYPE_TCP) {
797 socklen_t len = sizeof(nd->addr);
798
799 if (connect(f->fd, (struct sockaddr *) &nd->addr, len) < 0) {
800 td_verror(td, errno, "connect");
801 close(f->fd);
802 return 1;
803 }
804 } else if (o->proto == FIO_TYPE_TCP_V6) {
805 socklen_t len = sizeof(nd->addr6);
806
807 if (connect(f->fd, (struct sockaddr *) &nd->addr6, len) < 0) {
808 td_verror(td, errno, "connect");
809 close(f->fd);
810 return 1;
811 }
812
813 } else {
814 struct sockaddr_un *addr = &nd->addr_un;
815 socklen_t len;
816
817 len = sizeof(addr->sun_family) + strlen(addr->sun_path) + 1;
818
819 if (connect(f->fd, (struct sockaddr *) addr, len) < 0) {
820 td_verror(td, errno, "connect");
821 close(f->fd);
822 return 1;
823 }
824 }
825
826 return 0;
827 }
828
fio_netio_accept(struct thread_data * td,struct fio_file * f)829 static int fio_netio_accept(struct thread_data *td, struct fio_file *f)
830 {
831 struct netio_data *nd = td->io_ops_data;
832 struct netio_options *o = td->eo;
833 socklen_t socklen;
834 int state;
835
836 if (is_udp(o)) {
837 f->fd = nd->listenfd;
838 return 0;
839 }
840
841 state = td->runstate;
842 td_set_runstate(td, TD_SETTING_UP);
843
844 log_info("fio: waiting for connection\n");
845
846 if (poll_wait(td, nd->listenfd, POLLIN) < 0)
847 goto err;
848
849 if (o->proto == FIO_TYPE_TCP) {
850 socklen = sizeof(nd->addr);
851 f->fd = accept(nd->listenfd, (struct sockaddr *) &nd->addr, &socklen);
852 } else {
853 socklen = sizeof(nd->addr6);
854 f->fd = accept(nd->listenfd, (struct sockaddr *) &nd->addr6, &socklen);
855 }
856
857 if (f->fd < 0) {
858 td_verror(td, errno, "accept");
859 goto err;
860 }
861
862 #ifdef CONFIG_TCP_NODELAY
863 if (o->nodelay && is_tcp(o)) {
864 int optval = 1;
865
866 if (setsockopt(f->fd, IPPROTO_TCP, TCP_NODELAY, (void *) &optval, sizeof(int)) < 0) {
867 log_err("fio: cannot set TCP_NODELAY option on socket (%s), disable with 'nodelay=0'\n", strerror(errno));
868 return 1;
869 }
870 }
871 #endif
872
873 reset_all_stats(td);
874 td_set_runstate(td, state);
875 return 0;
876 err:
877 td_set_runstate(td, state);
878 return 1;
879 }
880
fio_netio_send_close(struct thread_data * td,struct fio_file * f)881 static void fio_netio_send_close(struct thread_data *td, struct fio_file *f)
882 {
883 struct netio_data *nd = td->io_ops_data;
884 struct netio_options *o = td->eo;
885 struct udp_close_msg msg;
886 struct sockaddr *to;
887 socklen_t len;
888 int ret;
889
890 if (is_ipv6(o)) {
891 to = (struct sockaddr *) &nd->addr6;
892 len = sizeof(nd->addr6);
893 } else {
894 to = (struct sockaddr *) &nd->addr;
895 len = sizeof(nd->addr);
896 }
897
898 msg.magic = cpu_to_le32((uint32_t) FIO_LINK_OPEN_CLOSE_MAGIC);
899 msg.cmd = cpu_to_le32((uint32_t) FIO_LINK_CLOSE);
900
901 ret = sendto(f->fd, (void *) &msg, sizeof(msg), MSG_WAITALL, to, len);
902 if (ret < 0)
903 td_verror(td, errno, "sendto udp link close");
904 }
905
fio_netio_close_file(struct thread_data * td,struct fio_file * f)906 static int fio_netio_close_file(struct thread_data *td, struct fio_file *f)
907 {
908 /*
909 * Notify the receiver that we are closing down the link
910 */
911 fio_netio_send_close(td, f);
912
913 return generic_close_file(td, f);
914 }
915
fio_netio_udp_recv_open(struct thread_data * td,struct fio_file * f)916 static int fio_netio_udp_recv_open(struct thread_data *td, struct fio_file *f)
917 {
918 struct netio_data *nd = td->io_ops_data;
919 struct netio_options *o = td->eo;
920 struct udp_close_msg msg;
921 struct sockaddr *to;
922 socklen_t len;
923 int ret;
924
925 if (is_ipv6(o)) {
926 len = sizeof(nd->addr6);
927 to = (struct sockaddr *) &nd->addr6;
928 } else {
929 len = sizeof(nd->addr);
930 to = (struct sockaddr *) &nd->addr;
931 }
932
933 ret = recvfrom(f->fd, (void *) &msg, sizeof(msg), MSG_WAITALL, to, &len);
934 if (ret < 0) {
935 td_verror(td, errno, "recvfrom udp link open");
936 return ret;
937 }
938
939 if (ntohl(msg.magic) != FIO_LINK_OPEN_CLOSE_MAGIC ||
940 ntohl(msg.cmd) != FIO_LINK_OPEN) {
941 log_err("fio: bad udp open magic %x/%x\n", ntohl(msg.magic),
942 ntohl(msg.cmd));
943 return -1;
944 }
945
946 fio_gettime(&td->start, NULL);
947 return 0;
948 }
949
fio_netio_send_open(struct thread_data * td,struct fio_file * f)950 static int fio_netio_send_open(struct thread_data *td, struct fio_file *f)
951 {
952 struct netio_data *nd = td->io_ops_data;
953 struct netio_options *o = td->eo;
954 struct udp_close_msg msg;
955 struct sockaddr *to;
956 socklen_t len;
957 int ret;
958
959 if (is_ipv6(o)) {
960 len = sizeof(nd->addr6);
961 to = (struct sockaddr *) &nd->addr6;
962 } else {
963 len = sizeof(nd->addr);
964 to = (struct sockaddr *) &nd->addr;
965 }
966
967 msg.magic = htonl(FIO_LINK_OPEN_CLOSE_MAGIC);
968 msg.cmd = htonl(FIO_LINK_OPEN);
969
970 ret = sendto(f->fd, (void *) &msg, sizeof(msg), MSG_WAITALL, to, len);
971 if (ret < 0) {
972 td_verror(td, errno, "sendto udp link open");
973 return ret;
974 }
975
976 return 0;
977 }
978
fio_netio_open_file(struct thread_data * td,struct fio_file * f)979 static int fio_netio_open_file(struct thread_data *td, struct fio_file *f)
980 {
981 int ret;
982 struct netio_options *o = td->eo;
983
984 if (o->listen)
985 ret = fio_netio_accept(td, f);
986 else
987 ret = fio_netio_connect(td, f);
988
989 if (ret) {
990 f->fd = -1;
991 return ret;
992 }
993
994 if (is_udp(o)) {
995 if (td_write(td))
996 ret = fio_netio_send_open(td, f);
997 else {
998 int state;
999
1000 state = td->runstate;
1001 td_set_runstate(td, TD_SETTING_UP);
1002 ret = fio_netio_udp_recv_open(td, f);
1003 td_set_runstate(td, state);
1004 }
1005 }
1006
1007 if (ret)
1008 fio_netio_close_file(td, f);
1009
1010 return ret;
1011 }
1012
fio_fill_addr(struct thread_data * td,const char * host,int af,void * dst,struct addrinfo ** res)1013 static int fio_fill_addr(struct thread_data *td, const char *host, int af,
1014 void *dst, struct addrinfo **res)
1015 {
1016 struct netio_options *o = td->eo;
1017 struct addrinfo hints;
1018 int ret;
1019
1020 if (inet_pton(af, host, dst))
1021 return 0;
1022
1023 memset(&hints, 0, sizeof(hints));
1024
1025 if (is_tcp(o))
1026 hints.ai_socktype = SOCK_STREAM;
1027 else
1028 hints.ai_socktype = SOCK_DGRAM;
1029
1030 if (is_ipv6(o))
1031 hints.ai_family = AF_INET6;
1032 else
1033 hints.ai_family = AF_INET;
1034
1035 ret = getaddrinfo(host, NULL, &hints, res);
1036 if (ret) {
1037 int e = EINVAL;
1038 char str[128];
1039
1040 if (ret == EAI_SYSTEM)
1041 e = errno;
1042
1043 snprintf(str, sizeof(str), "getaddrinfo: %s", gai_strerror(ret));
1044 td_verror(td, e, str);
1045 return 1;
1046 }
1047
1048 return 0;
1049 }
1050
fio_netio_setup_connect_inet(struct thread_data * td,const char * host,unsigned short port)1051 static int fio_netio_setup_connect_inet(struct thread_data *td,
1052 const char *host, unsigned short port)
1053 {
1054 struct netio_data *nd = td->io_ops_data;
1055 struct netio_options *o = td->eo;
1056 struct addrinfo *res = NULL;
1057 void *dst, *src;
1058 int af, len;
1059
1060 if (!host) {
1061 log_err("fio: connect with no host to connect to.\n");
1062 if (td_read(td))
1063 log_err("fio: did you forget to set 'listen'?\n");
1064
1065 td_verror(td, EINVAL, "no hostname= set");
1066 return 1;
1067 }
1068
1069 nd->addr.sin_family = AF_INET;
1070 nd->addr.sin_port = htons(port);
1071 nd->addr6.sin6_family = AF_INET6;
1072 nd->addr6.sin6_port = htons(port);
1073
1074 if (is_ipv6(o)) {
1075 af = AF_INET6;
1076 dst = &nd->addr6.sin6_addr;
1077 } else {
1078 af = AF_INET;
1079 dst = &nd->addr.sin_addr;
1080 }
1081
1082 if (fio_fill_addr(td, host, af, dst, &res))
1083 return 1;
1084
1085 if (!res)
1086 return 0;
1087
1088 if (is_ipv6(o)) {
1089 len = sizeof(nd->addr6.sin6_addr);
1090 src = &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
1091 } else {
1092 len = sizeof(nd->addr.sin_addr);
1093 src = &((struct sockaddr_in *) res->ai_addr)->sin_addr;
1094 }
1095
1096 memcpy(dst, src, len);
1097 freeaddrinfo(res);
1098 return 0;
1099 }
1100
fio_netio_setup_connect_unix(struct thread_data * td,const char * path)1101 static int fio_netio_setup_connect_unix(struct thread_data *td,
1102 const char *path)
1103 {
1104 struct netio_data *nd = td->io_ops_data;
1105 struct sockaddr_un *soun = &nd->addr_un;
1106
1107 soun->sun_family = AF_UNIX;
1108 memset(soun->sun_path, 0, sizeof(soun->sun_path));
1109 strncpy(soun->sun_path, path, sizeof(soun->sun_path) - 1);
1110 return 0;
1111 }
1112
fio_netio_setup_connect(struct thread_data * td)1113 static int fio_netio_setup_connect(struct thread_data *td)
1114 {
1115 struct netio_options *o = td->eo;
1116
1117 if (is_udp(o) || is_tcp(o))
1118 return fio_netio_setup_connect_inet(td, td->o.filename,o->port);
1119 else
1120 return fio_netio_setup_connect_unix(td, td->o.filename);
1121 }
1122
fio_netio_setup_listen_unix(struct thread_data * td,const char * path)1123 static int fio_netio_setup_listen_unix(struct thread_data *td, const char *path)
1124 {
1125 struct netio_data *nd = td->io_ops_data;
1126 struct sockaddr_un *addr = &nd->addr_un;
1127 mode_t mode;
1128 int len, fd;
1129
1130 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1131 if (fd < 0) {
1132 log_err("fio: socket: %s\n", strerror(errno));
1133 return -1;
1134 }
1135
1136 mode = umask(000);
1137
1138 memset(addr, 0, sizeof(*addr));
1139 addr->sun_family = AF_UNIX;
1140 strncpy(addr->sun_path, path, sizeof(addr->sun_path) - 1);
1141 unlink(path);
1142
1143 len = sizeof(addr->sun_family) + strlen(path) + 1;
1144
1145 if (bind(fd, (struct sockaddr *) addr, len) < 0) {
1146 log_err("fio: bind: %s\n", strerror(errno));
1147 close(fd);
1148 return -1;
1149 }
1150
1151 umask(mode);
1152 nd->listenfd = fd;
1153 return 0;
1154 }
1155
fio_netio_setup_listen_inet(struct thread_data * td,short port)1156 static int fio_netio_setup_listen_inet(struct thread_data *td, short port)
1157 {
1158 struct netio_data *nd = td->io_ops_data;
1159 struct netio_options *o = td->eo;
1160 struct ip_mreq mr;
1161 struct sockaddr_in sin;
1162 struct sockaddr *saddr;
1163 int fd, opt, type, domain;
1164 socklen_t len;
1165
1166 memset(&sin, 0, sizeof(sin));
1167
1168 if (o->proto == FIO_TYPE_TCP) {
1169 type = SOCK_STREAM;
1170 domain = AF_INET;
1171 } else if (o->proto == FIO_TYPE_TCP_V6) {
1172 type = SOCK_STREAM;
1173 domain = AF_INET6;
1174 } else if (o->proto == FIO_TYPE_UDP) {
1175 type = SOCK_DGRAM;
1176 domain = AF_INET;
1177 } else if (o->proto == FIO_TYPE_UDP_V6) {
1178 type = SOCK_DGRAM;
1179 domain = AF_INET6;
1180 } else {
1181 log_err("fio: unknown proto %d\n", o->proto);
1182 return 1;
1183 }
1184
1185 fd = socket(domain, type, 0);
1186 if (fd < 0) {
1187 td_verror(td, errno, "socket");
1188 return 1;
1189 }
1190
1191 opt = 1;
1192 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *) &opt, sizeof(opt)) < 0) {
1193 td_verror(td, errno, "setsockopt");
1194 close(fd);
1195 return 1;
1196 }
1197 #ifdef SO_REUSEPORT
1198 if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *) &opt, sizeof(opt)) < 0) {
1199 td_verror(td, errno, "setsockopt");
1200 close(fd);
1201 return 1;
1202 }
1203 #endif
1204
1205 if (set_window_size(td, fd)) {
1206 close(fd);
1207 return 1;
1208 }
1209 if (set_mss(td, fd)) {
1210 close(fd);
1211 return 1;
1212 }
1213
1214 if (td->o.filename) {
1215 if (!is_udp(o) || !fio_netio_is_multicast(td->o.filename)) {
1216 log_err("fio: hostname not valid for non-multicast inbound network IO\n");
1217 close(fd);
1218 return 1;
1219 }
1220 if (is_ipv6(o)) {
1221 log_err("fio: IPv6 not supported for multicast network IO\n");
1222 close(fd);
1223 return 1;
1224 }
1225
1226 inet_aton(td->o.filename, &sin.sin_addr);
1227
1228 mr.imr_multiaddr = sin.sin_addr;
1229 if (o->intfc) {
1230 if (inet_aton(o->intfc, &mr.imr_interface) == 0) {
1231 log_err("fio: interface not valid interface IP\n");
1232 close(fd);
1233 return 1;
1234 }
1235 } else {
1236 mr.imr_interface.s_addr = htonl(INADDR_ANY);
1237 }
1238
1239 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const char*)&mr, sizeof(mr)) < 0) {
1240 td_verror(td, errno, "setsockopt IP_ADD_MEMBERSHIP");
1241 close(fd);
1242 return 1;
1243 }
1244 }
1245
1246 if (!is_ipv6(o)) {
1247 saddr = (struct sockaddr *) &nd->addr;
1248 len = sizeof(nd->addr);
1249
1250 nd->addr.sin_family = AF_INET;
1251 nd->addr.sin_addr.s_addr = sin.sin_addr.s_addr ? sin.sin_addr.s_addr : htonl(INADDR_ANY);
1252 nd->addr.sin_port = htons(port);
1253 } else {
1254 saddr = (struct sockaddr *) &nd->addr6;
1255 len = sizeof(nd->addr6);
1256
1257 nd->addr6.sin6_family = AF_INET6;
1258 nd->addr6.sin6_addr = in6addr_any;
1259 nd->addr6.sin6_port = htons(port);
1260 }
1261
1262 if (bind(fd, saddr, len) < 0) {
1263 close(fd);
1264 td_verror(td, errno, "bind");
1265 return 1;
1266 }
1267
1268 nd->listenfd = fd;
1269 return 0;
1270 }
1271
fio_netio_setup_listen(struct thread_data * td)1272 static int fio_netio_setup_listen(struct thread_data *td)
1273 {
1274 struct netio_data *nd = td->io_ops_data;
1275 struct netio_options *o = td->eo;
1276 int ret;
1277
1278 if (is_udp(o) || is_tcp(o))
1279 ret = fio_netio_setup_listen_inet(td, o->port);
1280 else
1281 ret = fio_netio_setup_listen_unix(td, td->o.filename);
1282
1283 if (ret)
1284 return ret;
1285 if (is_udp(o))
1286 return 0;
1287
1288 if (listen(nd->listenfd, 10) < 0) {
1289 td_verror(td, errno, "listen");
1290 nd->listenfd = -1;
1291 return 1;
1292 }
1293
1294 return 0;
1295 }
1296
fio_netio_init(struct thread_data * td)1297 static int fio_netio_init(struct thread_data *td)
1298 {
1299 struct netio_options *o = td->eo;
1300 int ret;
1301
1302 #ifdef WIN32
1303 WSADATA wsd;
1304 WSAStartup(MAKEWORD(2,2), &wsd);
1305 #endif
1306
1307 if (td_random(td)) {
1308 log_err("fio: network IO can't be random\n");
1309 return 1;
1310 }
1311
1312 if (o->proto == FIO_TYPE_UNIX && o->port) {
1313 log_err("fio: network IO port not valid with unix socket\n");
1314 return 1;
1315 } else if (o->proto != FIO_TYPE_UNIX && !o->port) {
1316 log_err("fio: network IO requires port for tcp or udp\n");
1317 return 1;
1318 }
1319
1320 o->port += td->subjob_number;
1321
1322 if (!is_tcp(o)) {
1323 if (o->listen) {
1324 log_err("fio: listen only valid for TCP proto IO\n");
1325 return 1;
1326 }
1327 if (td_rw(td)) {
1328 log_err("fio: datagram network connections must be"
1329 " read OR write\n");
1330 return 1;
1331 }
1332 if (o->proto == FIO_TYPE_UNIX && !td->o.filename) {
1333 log_err("fio: UNIX sockets need host/filename\n");
1334 return 1;
1335 }
1336 o->listen = td_read(td);
1337 }
1338
1339 if (o->listen)
1340 ret = fio_netio_setup_listen(td);
1341 else
1342 ret = fio_netio_setup_connect(td);
1343
1344 return ret;
1345 }
1346
fio_netio_cleanup(struct thread_data * td)1347 static void fio_netio_cleanup(struct thread_data *td)
1348 {
1349 struct netio_data *nd = td->io_ops_data;
1350
1351 if (nd) {
1352 if (nd->listenfd != -1)
1353 close(nd->listenfd);
1354 if (nd->pipes[0] != -1)
1355 close(nd->pipes[0]);
1356 if (nd->pipes[1] != -1)
1357 close(nd->pipes[1]);
1358
1359 free(nd);
1360 }
1361 }
1362
fio_netio_setup(struct thread_data * td)1363 static int fio_netio_setup(struct thread_data *td)
1364 {
1365 struct netio_data *nd;
1366
1367 if (!td->files_index) {
1368 add_file(td, td->o.filename ?: "net", 0, 0);
1369 td->o.nr_files = td->o.nr_files ?: 1;
1370 td->o.open_files++;
1371 }
1372
1373 if (!td->io_ops_data) {
1374 nd = malloc(sizeof(*nd));
1375
1376 memset(nd, 0, sizeof(*nd));
1377 nd->listenfd = -1;
1378 nd->pipes[0] = nd->pipes[1] = -1;
1379 td->io_ops_data = nd;
1380 }
1381
1382 return 0;
1383 }
1384
fio_netio_terminate(struct thread_data * td)1385 static void fio_netio_terminate(struct thread_data *td)
1386 {
1387 kill(td->pid, SIGTERM);
1388 }
1389
1390 #ifdef CONFIG_LINUX_SPLICE
fio_netio_setup_splice(struct thread_data * td)1391 static int fio_netio_setup_splice(struct thread_data *td)
1392 {
1393 struct netio_data *nd;
1394
1395 fio_netio_setup(td);
1396
1397 nd = td->io_ops_data;
1398 if (nd) {
1399 if (pipe(nd->pipes) < 0)
1400 return 1;
1401
1402 nd->use_splice = 1;
1403 return 0;
1404 }
1405
1406 return 1;
1407 }
1408
1409 static struct ioengine_ops ioengine_splice = {
1410 .name = "netsplice",
1411 .version = FIO_IOOPS_VERSION,
1412 .prep = fio_netio_prep,
1413 .queue = fio_netio_queue,
1414 .setup = fio_netio_setup_splice,
1415 .init = fio_netio_init,
1416 .cleanup = fio_netio_cleanup,
1417 .open_file = fio_netio_open_file,
1418 .close_file = fio_netio_close_file,
1419 .terminate = fio_netio_terminate,
1420 .options = options,
1421 .option_struct_size = sizeof(struct netio_options),
1422 .flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_UNIDIR |
1423 FIO_PIPEIO,
1424 };
1425 #endif
1426
1427 static struct ioengine_ops ioengine_rw = {
1428 .name = "net",
1429 .version = FIO_IOOPS_VERSION,
1430 .prep = fio_netio_prep,
1431 .queue = fio_netio_queue,
1432 .setup = fio_netio_setup,
1433 .init = fio_netio_init,
1434 .cleanup = fio_netio_cleanup,
1435 .open_file = fio_netio_open_file,
1436 .close_file = fio_netio_close_file,
1437 .terminate = fio_netio_terminate,
1438 .options = options,
1439 .option_struct_size = sizeof(struct netio_options),
1440 .flags = FIO_SYNCIO | FIO_DISKLESSIO | FIO_UNIDIR |
1441 FIO_PIPEIO | FIO_BIT_BASED,
1442 };
1443
str_hostname_cb(void * data,const char * input)1444 static int str_hostname_cb(void *data, const char *input)
1445 {
1446 struct netio_options *o = data;
1447
1448 if (o->td->o.filename)
1449 free(o->td->o.filename);
1450 o->td->o.filename = strdup(input);
1451 return 0;
1452 }
1453
fio_netio_register(void)1454 static void fio_init fio_netio_register(void)
1455 {
1456 register_ioengine(&ioengine_rw);
1457 #ifdef CONFIG_LINUX_SPLICE
1458 register_ioengine(&ioengine_splice);
1459 #endif
1460 }
1461
fio_netio_unregister(void)1462 static void fio_exit fio_netio_unregister(void)
1463 {
1464 unregister_ioengine(&ioengine_rw);
1465 #ifdef CONFIG_LINUX_SPLICE
1466 unregister_ioengine(&ioengine_splice);
1467 #endif
1468 }
1469