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[PKT_SCHED]: Kill pkt_act.h inlining.
[linux-2.6/x86.git] / net / sunrpc / xprtsock.c
blob897bdd98231559421f5bbcfc2477e62b49faeb81
1 /*
2 * linux/net/sunrpc/xprtsock.c
3 *
4 * Client-side transport implementation for sockets.
5 *
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
10 *
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
14 *
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
16 */
17
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/capability.h>
21 #include <linux/sched.h>
22 #include <linux/pagemap.h>
23 #include <linux/errno.h>
24 #include <linux/socket.h>
25 #include <linux/in.h>
26 #include <linux/net.h>
27 #include <linux/mm.h>
28 #include <linux/udp.h>
29 #include <linux/tcp.h>
30 #include <linux/sunrpc/clnt.h>
31 #include <linux/sunrpc/sched.h>
32 #include <linux/file.h>
33
34 #include <net/sock.h>
35 #include <net/checksum.h>
36 #include <net/udp.h>
37 #include <net/tcp.h>
38
39 /*
40 * xprtsock tunables
41 */
42 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
43 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
44
45 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
46 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
47
48 /*
49 * How many times to try sending a request on a socket before waiting
50 * for the socket buffer to clear.
51 */
52 #define XS_SENDMSG_RETRY (10U)
53
54 /*
55 * Time out for an RPC UDP socket connect. UDP socket connects are
56 * synchronous, but we set a timeout anyway in case of resource
57 * exhaustion on the local host.
58 */
59 #define XS_UDP_CONN_TO (5U * HZ)
60
61 /*
62 * Wait duration for an RPC TCP connection to be established. Solaris
63 * NFS over TCP uses 60 seconds, for example, which is in line with how
64 * long a server takes to reboot.
65 */
66 #define XS_TCP_CONN_TO (60U * HZ)
67
68 /*
69 * Wait duration for a reply from the RPC portmapper.
70 */
71 #define XS_BIND_TO (60U * HZ)
72
73 /*
74 * Delay if a UDP socket connect error occurs. This is most likely some
75 * kind of resource problem on the local host.
76 */
77 #define XS_UDP_REEST_TO (2U * HZ)
78
79 /*
80 * The reestablish timeout allows clients to delay for a bit before attempting
81 * to reconnect to a server that just dropped our connection.
82 *
83 * We implement an exponential backoff when trying to reestablish a TCP
84 * transport connection with the server. Some servers like to drop a TCP
85 * connection when they are overworked, so we start with a short timeout and
86 * increase over time if the server is down or not responding.
87 */
88 #define XS_TCP_INIT_REEST_TO (3U * HZ)
89 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
90
91 /*
92 * TCP idle timeout; client drops the transport socket if it is idle
93 * for this long. Note that we also timeout UDP sockets to prevent
94 * holding port numbers when there is no RPC traffic.
95 */
96 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
97
98 #ifdef RPC_DEBUG
99 # undef RPC_DEBUG_DATA
100 # define RPCDBG_FACILITY RPCDBG_TRANS
101 #endif
102
103 #ifdef RPC_DEBUG_DATA
104 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
105 {
106 u8 *buf = (u8 *) packet;
107 int j;
108
109 dprintk("RPC: %s\n", msg);
110 for (j = 0; j < count && j < 128; j += 4) {
111 if (!(j & 31)) {
112 if (j)
113 dprintk("\n");
114 dprintk("0x%04x ", j);
115 }
116 dprintk("%02x%02x%02x%02x ",
117 buf[j], buf[j+1], buf[j+2], buf[j+3]);
118 }
119 dprintk("\n");
120 }
121 #else
122 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
123 {
124 /* NOP */
125 }
126 #endif
127
128 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
129
130 static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len)
131 {
132 struct kvec iov = {
133 .iov_base = xdr->head[0].iov_base + base,
134 .iov_len = len - base,
135 };
136 struct msghdr msg = {
137 .msg_name = addr,
138 .msg_namelen = addrlen,
139 .msg_flags = XS_SENDMSG_FLAGS,
140 };
141
142 if (xdr->len > len)
143 msg.msg_flags |= MSG_MORE;
144
145 if (likely(iov.iov_len))
146 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
147 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
148 }
149
150 static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len)
151 {
152 struct kvec iov = {
153 .iov_base = xdr->tail[0].iov_base + base,
154 .iov_len = len - base,
155 };
156 struct msghdr msg = {
157 .msg_flags = XS_SENDMSG_FLAGS,
158 };
159
160 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
161 }
162
163 /**
164 * xs_sendpages - write pages directly to a socket
165 * @sock: socket to send on
166 * @addr: UDP only -- address of destination
167 * @addrlen: UDP only -- length of destination address
168 * @xdr: buffer containing this request
169 * @base: starting position in the buffer
170 *
171 */
172 static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
173 {
174 struct page **ppage = xdr->pages;
175 unsigned int len, pglen = xdr->page_len;
176 int err, ret = 0;
177
178 if (unlikely(!sock))
179 return -ENOTCONN;
180
181 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
182
183 len = xdr->head[0].iov_len;
184 if (base < len || (addr != NULL && base == 0)) {
185 err = xs_send_head(sock, addr, addrlen, xdr, base, len);
186 if (ret == 0)
187 ret = err;
188 else if (err > 0)
189 ret += err;
190 if (err != (len - base))
191 goto out;
192 base = 0;
193 } else
194 base -= len;
195
196 if (unlikely(pglen == 0))
197 goto copy_tail;
198 if (unlikely(base >= pglen)) {
199 base -= pglen;
200 goto copy_tail;
201 }
202 if (base || xdr->page_base) {
203 pglen -= base;
204 base += xdr->page_base;
205 ppage += base >> PAGE_CACHE_SHIFT;
206 base &= ~PAGE_CACHE_MASK;
207 }
208
209 do {
210 int flags = XS_SENDMSG_FLAGS;
211
212 len = PAGE_CACHE_SIZE;
213 if (base)
214 len -= base;
215 if (pglen < len)
216 len = pglen;
217
218 if (pglen != len || xdr->tail[0].iov_len != 0)
219 flags |= MSG_MORE;
220
221 err = kernel_sendpage(sock, *ppage, base, len, flags);
222 if (ret == 0)
223 ret = err;
224 else if (err > 0)
225 ret += err;
226 if (err != len)
227 goto out;
228 base = 0;
229 ppage++;
230 } while ((pglen -= len) != 0);
231 copy_tail:
232 len = xdr->tail[0].iov_len;
233 if (base < len) {
234 err = xs_send_tail(sock, xdr, base, len);
235 if (ret == 0)
236 ret = err;
237 else if (err > 0)
238 ret += err;
239 }
240 out:
241 return ret;
242 }
243
244 /**
245 * xs_nospace - place task on wait queue if transmit was incomplete
246 * @task: task to put to sleep
247 *
248 */
249 static void xs_nospace(struct rpc_task *task)
250 {
251 struct rpc_rqst *req = task->tk_rqstp;
252 struct rpc_xprt *xprt = req->rq_xprt;
253
254 dprintk("RPC: %4d xmit incomplete (%u left of %u)\n",
255 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
256 req->rq_slen);
257
258 if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
259 /* Protect against races with write_space */
260 spin_lock_bh(&xprt->transport_lock);
261
262 /* Don't race with disconnect */
263 if (!xprt_connected(xprt))
264 task->tk_status = -ENOTCONN;
265 else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags))
266 xprt_wait_for_buffer_space(task);
267
268 spin_unlock_bh(&xprt->transport_lock);
269 } else
270 /* Keep holding the socket if it is blocked */
271 rpc_delay(task, HZ>>4);
272 }
273
274 /**
275 * xs_udp_send_request - write an RPC request to a UDP socket
276 * @task: address of RPC task that manages the state of an RPC request
277 *
278 * Return values:
279 * 0: The request has been sent
280 * EAGAIN: The socket was blocked, please call again later to
281 * complete the request
282 * ENOTCONN: Caller needs to invoke connect logic then call again
283 * other: Some other error occured, the request was not sent
284 */
285 static int xs_udp_send_request(struct rpc_task *task)
286 {
287 struct rpc_rqst *req = task->tk_rqstp;
288 struct rpc_xprt *xprt = req->rq_xprt;
289 struct xdr_buf *xdr = &req->rq_snd_buf;
290 int status;
291
292 xs_pktdump("packet data:",
293 req->rq_svec->iov_base,
294 req->rq_svec->iov_len);
295
296 req->rq_xtime = jiffies;
297 status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr,
298 sizeof(xprt->addr), xdr, req->rq_bytes_sent);
299
300 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
301 xdr->len - req->rq_bytes_sent, status);
302
303 if (likely(status >= (int) req->rq_slen))
304 return 0;
305
306 /* Still some bytes left; set up for a retry later. */
307 if (status > 0)
308 status = -EAGAIN;
309
310 switch (status) {
311 case -ENETUNREACH:
312 case -EPIPE:
313 case -ECONNREFUSED:
314 /* When the server has died, an ICMP port unreachable message
315 * prompts ECONNREFUSED. */
316 break;
317 case -EAGAIN:
318 xs_nospace(task);
319 break;
320 default:
321 dprintk("RPC: sendmsg returned unrecognized error %d\n",
322 -status);
323 break;
324 }
325
326 return status;
327 }
328
329 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
330 {
331 u32 reclen = buf->len - sizeof(rpc_fraghdr);
332 rpc_fraghdr *base = buf->head[0].iov_base;
333 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
334 }
335
336 /**
337 * xs_tcp_send_request - write an RPC request to a TCP socket
338 * @task: address of RPC task that manages the state of an RPC request
339 *
340 * Return values:
341 * 0: The request has been sent
342 * EAGAIN: The socket was blocked, please call again later to
343 * complete the request
344 * ENOTCONN: Caller needs to invoke connect logic then call again
345 * other: Some other error occured, the request was not sent
346 *
347 * XXX: In the case of soft timeouts, should we eventually give up
348 * if sendmsg is not able to make progress?
349 */
350 static int xs_tcp_send_request(struct rpc_task *task)
351 {
352 struct rpc_rqst *req = task->tk_rqstp;
353 struct rpc_xprt *xprt = req->rq_xprt;
354 struct xdr_buf *xdr = &req->rq_snd_buf;
355 int status, retry = 0;
356
357 xs_encode_tcp_record_marker(&req->rq_snd_buf);
358
359 xs_pktdump("packet data:",
360 req->rq_svec->iov_base,
361 req->rq_svec->iov_len);
362
363 /* Continue transmitting the packet/record. We must be careful
364 * to cope with writespace callbacks arriving _after_ we have
365 * called sendmsg(). */
366 while (1) {
367 req->rq_xtime = jiffies;
368 status = xs_sendpages(xprt->sock, NULL, 0, xdr,
369 req->rq_bytes_sent);
370
371 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
372 xdr->len - req->rq_bytes_sent, status);
373
374 if (unlikely(status < 0))
375 break;
376
377 /* If we've sent the entire packet, immediately
378 * reset the count of bytes sent. */
379 req->rq_bytes_sent += status;
380 task->tk_bytes_sent += status;
381 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
382 req->rq_bytes_sent = 0;
383 return 0;
384 }
385
386 status = -EAGAIN;
387 if (retry++ > XS_SENDMSG_RETRY)
388 break;
389 }
390
391 switch (status) {
392 case -EAGAIN:
393 xs_nospace(task);
394 break;
395 case -ECONNREFUSED:
396 case -ECONNRESET:
397 case -ENOTCONN:
398 case -EPIPE:
399 status = -ENOTCONN;
400 break;
401 default:
402 dprintk("RPC: sendmsg returned unrecognized error %d\n",
403 -status);
404 xprt_disconnect(xprt);
405 break;
406 }
407
408 return status;
409 }
410
411 /**
412 * xs_tcp_release_xprt - clean up after a tcp transmission
413 * @xprt: transport
414 * @task: rpc task
415 *
416 * This cleans up if an error causes us to abort the transmission of a request.
417 * In this case, the socket may need to be reset in order to avoid confusing
418 * the server.
419 */
420 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
421 {
422 struct rpc_rqst *req;
423
424 if (task != xprt->snd_task)
425 return;
426 if (task == NULL)
427 goto out_release;
428 req = task->tk_rqstp;
429 if (req->rq_bytes_sent == 0)
430 goto out_release;
431 if (req->rq_bytes_sent == req->rq_snd_buf.len)
432 goto out_release;
433 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
434 out_release:
435 xprt_release_xprt(xprt, task);
436 }
437
438 /**
439 * xs_close - close a socket
440 * @xprt: transport
441 *
442 * This is used when all requests are complete; ie, no DRC state remains
443 * on the server we want to save.
444 */
445 static void xs_close(struct rpc_xprt *xprt)
446 {
447 struct socket *sock = xprt->sock;
448 struct sock *sk = xprt->inet;
449
450 if (!sk)
451 goto clear_close_wait;
452
453 dprintk("RPC: xs_close xprt %p\n", xprt);
454
455 write_lock_bh(&sk->sk_callback_lock);
456 xprt->inet = NULL;
457 xprt->sock = NULL;
458
459 sk->sk_user_data = NULL;
460 sk->sk_data_ready = xprt->old_data_ready;
461 sk->sk_state_change = xprt->old_state_change;
462 sk->sk_write_space = xprt->old_write_space;
463 write_unlock_bh(&sk->sk_callback_lock);
464
465 sk->sk_no_check = 0;
466
467 sock_release(sock);
468 clear_close_wait:
469 smp_mb__before_clear_bit();
470 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
471 smp_mb__after_clear_bit();
472 }
473
474 /**
475 * xs_destroy - prepare to shutdown a transport
476 * @xprt: doomed transport
477 *
478 */
479 static void xs_destroy(struct rpc_xprt *xprt)
480 {
481 dprintk("RPC: xs_destroy xprt %p\n", xprt);
482
483 cancel_delayed_work(&xprt->connect_worker);
484 flush_scheduled_work();
485
486 xprt_disconnect(xprt);
487 xs_close(xprt);
488 kfree(xprt->slot);
489 }
490
491 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
492 {
493 return (struct rpc_xprt *) sk->sk_user_data;
494 }
495
496 /**
497 * xs_udp_data_ready - "data ready" callback for UDP sockets
498 * @sk: socket with data to read
499 * @len: how much data to read
500 *
501 */
502 static void xs_udp_data_ready(struct sock *sk, int len)
503 {
504 struct rpc_task *task;
505 struct rpc_xprt *xprt;
506 struct rpc_rqst *rovr;
507 struct sk_buff *skb;
508 int err, repsize, copied;
509 u32 _xid, *xp;
510
511 read_lock(&sk->sk_callback_lock);
512 dprintk("RPC: xs_udp_data_ready...\n");
513 if (!(xprt = xprt_from_sock(sk)))
514 goto out;
515
516 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
517 goto out;
518
519 if (xprt->shutdown)
520 goto dropit;
521
522 repsize = skb->len - sizeof(struct udphdr);
523 if (repsize < 4) {
524 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
525 goto dropit;
526 }
527
528 /* Copy the XID from the skb... */
529 xp = skb_header_pointer(skb, sizeof(struct udphdr),
530 sizeof(_xid), &_xid);
531 if (xp == NULL)
532 goto dropit;
533
534 /* Look up and lock the request corresponding to the given XID */
535 spin_lock(&xprt->transport_lock);
536 rovr = xprt_lookup_rqst(xprt, *xp);
537 if (!rovr)
538 goto out_unlock;
539 task = rovr->rq_task;
540
541 if ((copied = rovr->rq_private_buf.buflen) > repsize)
542 copied = repsize;
543
544 /* Suck it into the iovec, verify checksum if not done by hw. */
545 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
546 goto out_unlock;
547
548 /* Something worked... */
549 dst_confirm(skb->dst);
550
551 xprt_adjust_cwnd(task, copied);
552 xprt_update_rtt(task);
553 xprt_complete_rqst(task, copied);
554
555 out_unlock:
556 spin_unlock(&xprt->transport_lock);
557 dropit:
558 skb_free_datagram(sk, skb);
559 out:
560 read_unlock(&sk->sk_callback_lock);
561 }
562
563 static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
564 {
565 if (len > desc->count)
566 len = desc->count;
567 if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
568 dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
569 len, desc->count);
570 return 0;
571 }
572 desc->offset += len;
573 desc->count -= len;
574 dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
575 len, desc->count);
576 return len;
577 }
578
579 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
580 {
581 size_t len, used;
582 char *p;
583
584 p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
585 len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
586 used = xs_tcp_copy_data(desc, p, len);
587 xprt->tcp_offset += used;
588 if (used != len)
589 return;
590
591 xprt->tcp_reclen = ntohl(xprt->tcp_recm);
592 if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
593 xprt->tcp_flags |= XPRT_LAST_FRAG;
594 else
595 xprt->tcp_flags &= ~XPRT_LAST_FRAG;
596 xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
597
598 xprt->tcp_flags &= ~XPRT_COPY_RECM;
599 xprt->tcp_offset = 0;
600
601 /* Sanity check of the record length */
602 if (unlikely(xprt->tcp_reclen < 4)) {
603 dprintk("RPC: invalid TCP record fragment length\n");
604 xprt_disconnect(xprt);
605 return;
606 }
607 dprintk("RPC: reading TCP record fragment of length %d\n",
608 xprt->tcp_reclen);
609 }
610
611 static void xs_tcp_check_recm(struct rpc_xprt *xprt)
612 {
613 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
614 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
615 if (xprt->tcp_offset == xprt->tcp_reclen) {
616 xprt->tcp_flags |= XPRT_COPY_RECM;
617 xprt->tcp_offset = 0;
618 if (xprt->tcp_flags & XPRT_LAST_FRAG) {
619 xprt->tcp_flags &= ~XPRT_COPY_DATA;
620 xprt->tcp_flags |= XPRT_COPY_XID;
621 xprt->tcp_copied = 0;
622 }
623 }
624 }
625
626 static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
627 {
628 size_t len, used;
629 char *p;
630
631 len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
632 dprintk("RPC: reading XID (%Zu bytes)\n", len);
633 p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
634 used = xs_tcp_copy_data(desc, p, len);
635 xprt->tcp_offset += used;
636 if (used != len)
637 return;
638 xprt->tcp_flags &= ~XPRT_COPY_XID;
639 xprt->tcp_flags |= XPRT_COPY_DATA;
640 xprt->tcp_copied = 4;
641 dprintk("RPC: reading reply for XID %08x\n",
642 ntohl(xprt->tcp_xid));
643 xs_tcp_check_recm(xprt);
644 }
645
646 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
647 {
648 struct rpc_rqst *req;
649 struct xdr_buf *rcvbuf;
650 size_t len;
651 ssize_t r;
652
653 /* Find and lock the request corresponding to this xid */
654 spin_lock(&xprt->transport_lock);
655 req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
656 if (!req) {
657 xprt->tcp_flags &= ~XPRT_COPY_DATA;
658 dprintk("RPC: XID %08x request not found!\n",
659 ntohl(xprt->tcp_xid));
660 spin_unlock(&xprt->transport_lock);
661 return;
662 }
663
664 rcvbuf = &req->rq_private_buf;
665 len = desc->count;
666 if (len > xprt->tcp_reclen - xprt->tcp_offset) {
667 skb_reader_t my_desc;
668
669 len = xprt->tcp_reclen - xprt->tcp_offset;
670 memcpy(&my_desc, desc, sizeof(my_desc));
671 my_desc.count = len;
672 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
673 &my_desc, xs_tcp_copy_data);
674 desc->count -= r;
675 desc->offset += r;
676 } else
677 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
678 desc, xs_tcp_copy_data);
679
680 if (r > 0) {
681 xprt->tcp_copied += r;
682 xprt->tcp_offset += r;
683 }
684 if (r != len) {
685 /* Error when copying to the receive buffer,
686 * usually because we weren't able to allocate
687 * additional buffer pages. All we can do now
688 * is turn off XPRT_COPY_DATA, so the request
689 * will not receive any additional updates,
690 * and time out.
691 * Any remaining data from this record will
692 * be discarded.
693 */
694 xprt->tcp_flags &= ~XPRT_COPY_DATA;
695 dprintk("RPC: XID %08x truncated request\n",
696 ntohl(xprt->tcp_xid));
697 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
698 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
699 goto out;
700 }
701
702 dprintk("RPC: XID %08x read %Zd bytes\n",
703 ntohl(xprt->tcp_xid), r);
704 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
705 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
706
707 if (xprt->tcp_copied == req->rq_private_buf.buflen)
708 xprt->tcp_flags &= ~XPRT_COPY_DATA;
709 else if (xprt->tcp_offset == xprt->tcp_reclen) {
710 if (xprt->tcp_flags & XPRT_LAST_FRAG)
711 xprt->tcp_flags &= ~XPRT_COPY_DATA;
712 }
713
714 out:
715 if (!(xprt->tcp_flags & XPRT_COPY_DATA))
716 xprt_complete_rqst(req->rq_task, xprt->tcp_copied);
717 spin_unlock(&xprt->transport_lock);
718 xs_tcp_check_recm(xprt);
719 }
720
721 static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
722 {
723 size_t len;
724
725 len = xprt->tcp_reclen - xprt->tcp_offset;
726 if (len > desc->count)
727 len = desc->count;
728 desc->count -= len;
729 desc->offset += len;
730 xprt->tcp_offset += len;
731 dprintk("RPC: discarded %Zu bytes\n", len);
732 xs_tcp_check_recm(xprt);
733 }
734
735 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
736 {
737 struct rpc_xprt *xprt = rd_desc->arg.data;
738 skb_reader_t desc = {
739 .skb = skb,
740 .offset = offset,
741 .count = len,
742 .csum = 0
743 };
744
745 dprintk("RPC: xs_tcp_data_recv started\n");
746 do {
747 /* Read in a new fragment marker if necessary */
748 /* Can we ever really expect to get completely empty fragments? */
749 if (xprt->tcp_flags & XPRT_COPY_RECM) {
750 xs_tcp_read_fraghdr(xprt, &desc);
751 continue;
752 }
753 /* Read in the xid if necessary */
754 if (xprt->tcp_flags & XPRT_COPY_XID) {
755 xs_tcp_read_xid(xprt, &desc);
756 continue;
757 }
758 /* Read in the request data */
759 if (xprt->tcp_flags & XPRT_COPY_DATA) {
760 xs_tcp_read_request(xprt, &desc);
761 continue;
762 }
763 /* Skip over any trailing bytes on short reads */
764 xs_tcp_read_discard(xprt, &desc);
765 } while (desc.count);
766 dprintk("RPC: xs_tcp_data_recv done\n");
767 return len - desc.count;
768 }
769
770 /**
771 * xs_tcp_data_ready - "data ready" callback for TCP sockets
772 * @sk: socket with data to read
773 * @bytes: how much data to read
774 *
775 */
776 static void xs_tcp_data_ready(struct sock *sk, int bytes)
777 {
778 struct rpc_xprt *xprt;
779 read_descriptor_t rd_desc;
780
781 read_lock(&sk->sk_callback_lock);
782 dprintk("RPC: xs_tcp_data_ready...\n");
783 if (!(xprt = xprt_from_sock(sk)))
784 goto out;
785 if (xprt->shutdown)
786 goto out;
787
788 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
789 rd_desc.arg.data = xprt;
790 rd_desc.count = 65536;
791 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
792 out:
793 read_unlock(&sk->sk_callback_lock);
794 }
795
796 /**
797 * xs_tcp_state_change - callback to handle TCP socket state changes
798 * @sk: socket whose state has changed
799 *
800 */
801 static void xs_tcp_state_change(struct sock *sk)
802 {
803 struct rpc_xprt *xprt;
804
805 read_lock(&sk->sk_callback_lock);
806 if (!(xprt = xprt_from_sock(sk)))
807 goto out;
808 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
809 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
810 sk->sk_state, xprt_connected(xprt),
811 sock_flag(sk, SOCK_DEAD),
812 sock_flag(sk, SOCK_ZAPPED));
813
814 switch (sk->sk_state) {
815 case TCP_ESTABLISHED:
816 spin_lock_bh(&xprt->transport_lock);
817 if (!xprt_test_and_set_connected(xprt)) {
818 /* Reset TCP record info */
819 xprt->tcp_offset = 0;
820 xprt->tcp_reclen = 0;
821 xprt->tcp_copied = 0;
822 xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
823 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
824 xprt_wake_pending_tasks(xprt, 0);
825 }
826 spin_unlock_bh(&xprt->transport_lock);
827 break;
828 case TCP_SYN_SENT:
829 case TCP_SYN_RECV:
830 break;
831 case TCP_CLOSE_WAIT:
832 /* Try to schedule an autoclose RPC calls */
833 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
834 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
835 schedule_work(&xprt->task_cleanup);
836 default:
837 xprt_disconnect(xprt);
838 }
839 out:
840 read_unlock(&sk->sk_callback_lock);
841 }
842
843 /**
844 * xs_udp_write_space - callback invoked when socket buffer space
845 * becomes available
846 * @sk: socket whose state has changed
847 *
848 * Called when more output buffer space is available for this socket.
849 * We try not to wake our writers until they can make "significant"
850 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
851 * with a bunch of small requests.
852 */
853 static void xs_udp_write_space(struct sock *sk)
854 {
855 read_lock(&sk->sk_callback_lock);
856
857 /* from net/core/sock.c:sock_def_write_space */
858 if (sock_writeable(sk)) {
859 struct socket *sock;
860 struct rpc_xprt *xprt;
861
862 if (unlikely(!(sock = sk->sk_socket)))
863 goto out;
864 if (unlikely(!(xprt = xprt_from_sock(sk))))
865 goto out;
866 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
867 goto out;
868
869 xprt_write_space(xprt);
870 }
871
872 out:
873 read_unlock(&sk->sk_callback_lock);
874 }
875
876 /**
877 * xs_tcp_write_space - callback invoked when socket buffer space
878 * becomes available
879 * @sk: socket whose state has changed
880 *
881 * Called when more output buffer space is available for this socket.
882 * We try not to wake our writers until they can make "significant"
883 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
884 * with a bunch of small requests.
885 */
886 static void xs_tcp_write_space(struct sock *sk)
887 {
888 read_lock(&sk->sk_callback_lock);
889
890 /* from net/core/stream.c:sk_stream_write_space */
891 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
892 struct socket *sock;
893 struct rpc_xprt *xprt;
894
895 if (unlikely(!(sock = sk->sk_socket)))
896 goto out;
897 if (unlikely(!(xprt = xprt_from_sock(sk))))
898 goto out;
899 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
900 goto out;
901
902 xprt_write_space(xprt);
903 }
904
905 out:
906 read_unlock(&sk->sk_callback_lock);
907 }
908
909 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
910 {
911 struct sock *sk = xprt->inet;
912
913 if (xprt->rcvsize) {
914 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
915 sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2;
916 }
917 if (xprt->sndsize) {
918 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
919 sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
920 sk->sk_write_space(sk);
921 }
922 }
923
924 /**
925 * xs_udp_set_buffer_size - set send and receive limits
926 * @xprt: generic transport
927 * @sndsize: requested size of send buffer, in bytes
928 * @rcvsize: requested size of receive buffer, in bytes
929 *
930 * Set socket send and receive buffer size limits.
931 */
932 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
933 {
934 xprt->sndsize = 0;
935 if (sndsize)
936 xprt->sndsize = sndsize + 1024;
937 xprt->rcvsize = 0;
938 if (rcvsize)
939 xprt->rcvsize = rcvsize + 1024;
940
941 xs_udp_do_set_buffer_size(xprt);
942 }
943
944 /**
945 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
946 * @task: task that timed out
947 *
948 * Adjust the congestion window after a retransmit timeout has occurred.
949 */
950 static void xs_udp_timer(struct rpc_task *task)
951 {
952 xprt_adjust_cwnd(task, -ETIMEDOUT);
953 }
954
955 static unsigned short xs_get_random_port(void)
956 {
957 unsigned short range = xprt_max_resvport - xprt_min_resvport;
958 unsigned short rand = (unsigned short) net_random() % range;
959 return rand + xprt_min_resvport;
960 }
961
962 /**
963 * xs_set_port - reset the port number in the remote endpoint address
964 * @xprt: generic transport
965 * @port: new port number
966 *
967 */
968 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
969 {
970 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
971 xprt->addr.sin_port = htons(port);
972 }
973
974 static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
975 {
976 struct sockaddr_in myaddr = {
977 .sin_family = AF_INET,
978 };
979 int err;
980 unsigned short port = xprt->port;
981
982 do {
983 myaddr.sin_port = htons(port);
984 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
985 sizeof(myaddr));
986 if (err == 0) {
987 xprt->port = port;
988 dprintk("RPC: xs_bindresvport bound to port %u\n",
989 port);
990 return 0;
991 }
992 if (port <= xprt_min_resvport)
993 port = xprt_max_resvport;
994 else
995 port--;
996 } while (err == -EADDRINUSE && port != xprt->port);
997
998 dprintk("RPC: can't bind to reserved port (%d).\n", -err);
999 return err;
1000 }
1001
1002 /**
1003 * xs_udp_connect_worker - set up a UDP socket
1004 * @args: RPC transport to connect
1005 *
1006 * Invoked by a work queue tasklet.
1007 */
1008 static void xs_udp_connect_worker(void *args)
1009 {
1010 struct rpc_xprt *xprt = (struct rpc_xprt *) args;
1011 struct socket *sock = xprt->sock;
1012 int err, status = -EIO;
1013
1014 if (xprt->shutdown || xprt->addr.sin_port == 0)
1015 goto out;
1016
1017 dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt);
1018
1019 /* Start by resetting any existing state */
1020 xs_close(xprt);
1021
1022 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1023 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1024 goto out;
1025 }
1026
1027 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
1028 sock_release(sock);
1029 goto out;
1030 }
1031
1032 if (!xprt->inet) {
1033 struct sock *sk = sock->sk;
1034
1035 write_lock_bh(&sk->sk_callback_lock);
1036
1037 sk->sk_user_data = xprt;
1038 xprt->old_data_ready = sk->sk_data_ready;
1039 xprt->old_state_change = sk->sk_state_change;
1040 xprt->old_write_space = sk->sk_write_space;
1041 sk->sk_data_ready = xs_udp_data_ready;
1042 sk->sk_write_space = xs_udp_write_space;
1043 sk->sk_no_check = UDP_CSUM_NORCV;
1044 sk->sk_allocation = GFP_ATOMIC;
1045
1046 xprt_set_connected(xprt);
1047
1048 /* Reset to new socket */
1049 xprt->sock = sock;
1050 xprt->inet = sk;
1051
1052 write_unlock_bh(&sk->sk_callback_lock);
1053 }
1054 xs_udp_do_set_buffer_size(xprt);
1055 status = 0;
1056 out:
1057 xprt_wake_pending_tasks(xprt, status);
1058 xprt_clear_connecting(xprt);
1059 }
1060
1061 /*
1062 * We need to preserve the port number so the reply cache on the server can
1063 * find our cached RPC replies when we get around to reconnecting.
1064 */
1065 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1066 {
1067 int result;
1068 struct socket *sock = xprt->sock;
1069 struct sockaddr any;
1070
1071 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1072
1073 /*
1074 * Disconnect the transport socket by doing a connect operation
1075 * with AF_UNSPEC. This should return immediately...
1076 */
1077 memset(&any, 0, sizeof(any));
1078 any.sa_family = AF_UNSPEC;
1079 result = kernel_connect(sock, &any, sizeof(any), 0);
1080 if (result)
1081 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1082 result);
1083 }
1084
1085 /**
1086 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1087 * @args: RPC transport to connect
1088 *
1089 * Invoked by a work queue tasklet.
1090 */
1091 static void xs_tcp_connect_worker(void *args)
1092 {
1093 struct rpc_xprt *xprt = (struct rpc_xprt *)args;
1094 struct socket *sock = xprt->sock;
1095 int err, status = -EIO;
1096
1097 if (xprt->shutdown || xprt->addr.sin_port == 0)
1098 goto out;
1099
1100 dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt);
1101
1102 if (!xprt->sock) {
1103 /* start from scratch */
1104 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1105 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1106 goto out;
1107 }
1108
1109 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
1110 sock_release(sock);
1111 goto out;
1112 }
1113 } else
1114 /* "close" the socket, preserving the local port */
1115 xs_tcp_reuse_connection(xprt);
1116
1117 if (!xprt->inet) {
1118 struct sock *sk = sock->sk;
1119
1120 write_lock_bh(&sk->sk_callback_lock);
1121
1122 sk->sk_user_data = xprt;
1123 xprt->old_data_ready = sk->sk_data_ready;
1124 xprt->old_state_change = sk->sk_state_change;
1125 xprt->old_write_space = sk->sk_write_space;
1126 sk->sk_data_ready = xs_tcp_data_ready;
1127 sk->sk_state_change = xs_tcp_state_change;
1128 sk->sk_write_space = xs_tcp_write_space;
1129 sk->sk_allocation = GFP_ATOMIC;
1130
1131 /* socket options */
1132 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1133 sock_reset_flag(sk, SOCK_LINGER);
1134 tcp_sk(sk)->linger2 = 0;
1135 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1136
1137 xprt_clear_connected(xprt);
1138
1139 /* Reset to new socket */
1140 xprt->sock = sock;
1141 xprt->inet = sk;
1142
1143 write_unlock_bh(&sk->sk_callback_lock);
1144 }
1145
1146 /* Tell the socket layer to start connecting... */
1147 xprt->stat.connect_count++;
1148 xprt->stat.connect_start = jiffies;
1149 status = kernel_connect(sock, (struct sockaddr *) &xprt->addr,
1150 sizeof(xprt->addr), O_NONBLOCK);
1151 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1152 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1153 if (status < 0) {
1154 switch (status) {
1155 case -EINPROGRESS:
1156 case -EALREADY:
1157 goto out_clear;
1158 case -ECONNREFUSED:
1159 case -ECONNRESET:
1160 /* retry with existing socket, after a delay */
1161 break;
1162 default:
1163 /* get rid of existing socket, and retry */
1164 xs_close(xprt);
1165 break;
1166 }
1167 }
1168 out:
1169 xprt_wake_pending_tasks(xprt, status);
1170 out_clear:
1171 xprt_clear_connecting(xprt);
1172 }
1173
1174 /**
1175 * xs_connect - connect a socket to a remote endpoint
1176 * @task: address of RPC task that manages state of connect request
1177 *
1178 * TCP: If the remote end dropped the connection, delay reconnecting.
1179 *
1180 * UDP socket connects are synchronous, but we use a work queue anyway
1181 * to guarantee that even unprivileged user processes can set up a
1182 * socket on a privileged port.
1183 *
1184 * If a UDP socket connect fails, the delay behavior here prevents
1185 * retry floods (hard mounts).
1186 */
1187 static void xs_connect(struct rpc_task *task)
1188 {
1189 struct rpc_xprt *xprt = task->tk_xprt;
1190
1191 if (xprt_test_and_set_connecting(xprt))
1192 return;
1193
1194 if (xprt->sock != NULL) {
1195 dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n",
1196 xprt, xprt->reestablish_timeout / HZ);
1197 schedule_delayed_work(&xprt->connect_worker,
1198 xprt->reestablish_timeout);
1199 xprt->reestablish_timeout <<= 1;
1200 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1201 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1202 } else {
1203 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1204 schedule_work(&xprt->connect_worker);
1205
1206 /* flush_scheduled_work can sleep... */
1207 if (!RPC_IS_ASYNC(task))
1208 flush_scheduled_work();
1209 }
1210 }
1211
1212 /**
1213 * xs_udp_print_stats - display UDP socket-specifc stats
1214 * @xprt: rpc_xprt struct containing statistics
1215 * @seq: output file
1216 *
1217 */
1218 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1219 {
1220 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1221 xprt->port,
1222 xprt->stat.bind_count,
1223 xprt->stat.sends,
1224 xprt->stat.recvs,
1225 xprt->stat.bad_xids,
1226 xprt->stat.req_u,
1227 xprt->stat.bklog_u);
1228 }
1229
1230 /**
1231 * xs_tcp_print_stats - display TCP socket-specifc stats
1232 * @xprt: rpc_xprt struct containing statistics
1233 * @seq: output file
1234 *
1235 */
1236 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1237 {
1238 long idle_time = 0;
1239
1240 if (xprt_connected(xprt))
1241 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1242
1243 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1244 xprt->port,
1245 xprt->stat.bind_count,
1246 xprt->stat.connect_count,
1247 xprt->stat.connect_time,
1248 idle_time,
1249 xprt->stat.sends,
1250 xprt->stat.recvs,
1251 xprt->stat.bad_xids,
1252 xprt->stat.req_u,
1253 xprt->stat.bklog_u);
1254 }
1255
1256 static struct rpc_xprt_ops xs_udp_ops = {
1257 .set_buffer_size = xs_udp_set_buffer_size,
1258 .reserve_xprt = xprt_reserve_xprt_cong,
1259 .release_xprt = xprt_release_xprt_cong,
1260 .set_port = xs_set_port,
1261 .connect = xs_connect,
1262 .buf_alloc = rpc_malloc,
1263 .buf_free = rpc_free,
1264 .send_request = xs_udp_send_request,
1265 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1266 .timer = xs_udp_timer,
1267 .release_request = xprt_release_rqst_cong,
1268 .close = xs_close,
1269 .destroy = xs_destroy,
1270 .print_stats = xs_udp_print_stats,
1271 };
1272
1273 static struct rpc_xprt_ops xs_tcp_ops = {
1274 .reserve_xprt = xprt_reserve_xprt,
1275 .release_xprt = xs_tcp_release_xprt,
1276 .set_port = xs_set_port,
1277 .connect = xs_connect,
1278 .buf_alloc = rpc_malloc,
1279 .buf_free = rpc_free,
1280 .send_request = xs_tcp_send_request,
1281 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1282 .close = xs_close,
1283 .destroy = xs_destroy,
1284 .print_stats = xs_tcp_print_stats,
1285 };
1286
1287 /**
1288 * xs_setup_udp - Set up transport to use a UDP socket
1289 * @xprt: transport to set up
1290 * @to: timeout parameters
1291 *
1292 */
1293 int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1294 {
1295 size_t slot_table_size;
1296
1297 dprintk("RPC: setting up udp-ipv4 transport...\n");
1298
1299 xprt->max_reqs = xprt_udp_slot_table_entries;
1300 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1301 xprt->slot = kzalloc(slot_table_size, GFP_KERNEL);
1302 if (xprt->slot == NULL)
1303 return -ENOMEM;
1304
1305 xprt->prot = IPPROTO_UDP;
1306 xprt->port = xs_get_random_port();
1307 xprt->tsh_size = 0;
1308 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1309 /* XXX: header size can vary due to auth type, IPv6, etc. */
1310 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1311
1312 INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt);
1313 xprt->bind_timeout = XS_BIND_TO;
1314 xprt->connect_timeout = XS_UDP_CONN_TO;
1315 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1316 xprt->idle_timeout = XS_IDLE_DISC_TO;
1317
1318 xprt->ops = &xs_udp_ops;
1319
1320 if (to)
1321 xprt->timeout = *to;
1322 else
1323 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1324
1325 return 0;
1326 }
1327
1328 /**
1329 * xs_setup_tcp - Set up transport to use a TCP socket
1330 * @xprt: transport to set up
1331 * @to: timeout parameters
1332 *
1333 */
1334 int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1335 {
1336 size_t slot_table_size;
1337
1338 dprintk("RPC: setting up tcp-ipv4 transport...\n");
1339
1340 xprt->max_reqs = xprt_tcp_slot_table_entries;
1341 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1342 xprt->slot = kzalloc(slot_table_size, GFP_KERNEL);
1343 if (xprt->slot == NULL)
1344 return -ENOMEM;
1345
1346 xprt->prot = IPPROTO_TCP;
1347 xprt->port = xs_get_random_port();
1348 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1349 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1350 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1351
1352 INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt);
1353 xprt->bind_timeout = XS_BIND_TO;
1354 xprt->connect_timeout = XS_TCP_CONN_TO;
1355 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1356 xprt->idle_timeout = XS_IDLE_DISC_TO;
1357
1358 xprt->ops = &xs_tcp_ops;
1359
1360 if (to)
1361 xprt->timeout = *to;
1362 else
1363 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1364
1365 return 0;
1366 }
x86 "subsystem" repository