SUNRPC: remove extraneous header inclusions
[linux-2.6.git] / net / sunrpc / xprtsock.c
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         ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
178
179         if (unlikely(!sock))
180                 return -ENOTCONN;
181
182         clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
183
184         len = xdr->head[0].iov_len;
185         if (base < len || (addr != NULL && base == 0)) {
186                 err = xs_send_head(sock, addr, addrlen, xdr, base, len);
187                 if (ret == 0)
188                         ret = err;
189                 else if (err > 0)
190                         ret += err;
191                 if (err != (len - base))
192                         goto out;
193                 base = 0;
194         } else
195                 base -= len;
196
197         if (unlikely(pglen == 0))
198                 goto copy_tail;
199         if (unlikely(base >= pglen)) {
200                 base -= pglen;
201                 goto copy_tail;
202         }
203         if (base || xdr->page_base) {
204                 pglen -= base;
205                 base += xdr->page_base;
206                 ppage += base >> PAGE_CACHE_SHIFT;
207                 base &= ~PAGE_CACHE_MASK;
208         }
209
210         sendpage = sock->ops->sendpage ? : sock_no_sendpage;
211         do {
212                 int flags = XS_SENDMSG_FLAGS;
213
214                 len = PAGE_CACHE_SIZE;
215                 if (base)
216                         len -= base;
217                 if (pglen < len)
218                         len = pglen;
219
220                 if (pglen != len || xdr->tail[0].iov_len != 0)
221                         flags |= MSG_MORE;
222
223                 /* Hmm... We might be dealing with highmem pages */
224                 if (PageHighMem(*ppage))
225                         sendpage = sock_no_sendpage;
226                 err = sendpage(sock, *ppage, base, len, flags);
227                 if (ret == 0)
228                         ret = err;
229                 else if (err > 0)
230                         ret += err;
231                 if (err != len)
232                         goto out;
233                 base = 0;
234                 ppage++;
235         } while ((pglen -= len) != 0);
236 copy_tail:
237         len = xdr->tail[0].iov_len;
238         if (base < len) {
239                 err = xs_send_tail(sock, xdr, base, len);
240                 if (ret == 0)
241                         ret = err;
242                 else if (err > 0)
243                         ret += err;
244         }
245 out:
246         return ret;
247 }
248
249 /**
250  * xs_nospace - place task on wait queue if transmit was incomplete
251  * @task: task to put to sleep
252  *
253  */
254 static void xs_nospace(struct rpc_task *task)
255 {
256         struct rpc_rqst *req = task->tk_rqstp;
257         struct rpc_xprt *xprt = req->rq_xprt;
258
259         dprintk("RPC: %4d xmit incomplete (%u left of %u)\n",
260                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
261                         req->rq_slen);
262
263         if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
264                 /* Protect against races with write_space */
265                 spin_lock_bh(&xprt->transport_lock);
266
267                 /* Don't race with disconnect */
268                 if (!xprt_connected(xprt))
269                         task->tk_status = -ENOTCONN;
270                 else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags))
271                         xprt_wait_for_buffer_space(task);
272
273                 spin_unlock_bh(&xprt->transport_lock);
274         } else
275                 /* Keep holding the socket if it is blocked */
276                 rpc_delay(task, HZ>>4);
277 }
278
279 /**
280  * xs_udp_send_request - write an RPC request to a UDP socket
281  * @task: address of RPC task that manages the state of an RPC request
282  *
283  * Return values:
284  *        0:    The request has been sent
285  *   EAGAIN:    The socket was blocked, please call again later to
286  *              complete the request
287  * ENOTCONN:    Caller needs to invoke connect logic then call again
288  *    other:    Some other error occured, the request was not sent
289  */
290 static int xs_udp_send_request(struct rpc_task *task)
291 {
292         struct rpc_rqst *req = task->tk_rqstp;
293         struct rpc_xprt *xprt = req->rq_xprt;
294         struct xdr_buf *xdr = &req->rq_snd_buf;
295         int status;
296
297         xs_pktdump("packet data:",
298                                 req->rq_svec->iov_base,
299                                 req->rq_svec->iov_len);
300
301         req->rq_xtime = jiffies;
302         status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr,
303                                 sizeof(xprt->addr), xdr, req->rq_bytes_sent);
304
305         dprintk("RPC:      xs_udp_send_request(%u) = %d\n",
306                         xdr->len - req->rq_bytes_sent, status);
307
308         if (likely(status >= (int) req->rq_slen))
309                 return 0;
310
311         /* Still some bytes left; set up for a retry later. */
312         if (status > 0)
313                 status = -EAGAIN;
314
315         switch (status) {
316         case -ENETUNREACH:
317         case -EPIPE:
318         case -ECONNREFUSED:
319                 /* When the server has died, an ICMP port unreachable message
320                  * prompts ECONNREFUSED. */
321                 break;
322         case -EAGAIN:
323                 xs_nospace(task);
324                 break;
325         default:
326                 dprintk("RPC:      sendmsg returned unrecognized error %d\n",
327                         -status);
328                 break;
329         }
330
331         return status;
332 }
333
334 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
335 {
336         u32 reclen = buf->len - sizeof(rpc_fraghdr);
337         rpc_fraghdr *base = buf->head[0].iov_base;
338         *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
339 }
340
341 /**
342  * xs_tcp_send_request - write an RPC request to a TCP socket
343  * @task: address of RPC task that manages the state of an RPC request
344  *
345  * Return values:
346  *        0:    The request has been sent
347  *   EAGAIN:    The socket was blocked, please call again later to
348  *              complete the request
349  * ENOTCONN:    Caller needs to invoke connect logic then call again
350  *    other:    Some other error occured, the request was not sent
351  *
352  * XXX: In the case of soft timeouts, should we eventually give up
353  *      if sendmsg is not able to make progress?
354  */
355 static int xs_tcp_send_request(struct rpc_task *task)
356 {
357         struct rpc_rqst *req = task->tk_rqstp;
358         struct rpc_xprt *xprt = req->rq_xprt;
359         struct xdr_buf *xdr = &req->rq_snd_buf;
360         int status, retry = 0;
361
362         xs_encode_tcp_record_marker(&req->rq_snd_buf);
363
364         xs_pktdump("packet data:",
365                                 req->rq_svec->iov_base,
366                                 req->rq_svec->iov_len);
367
368         /* Continue transmitting the packet/record. We must be careful
369          * to cope with writespace callbacks arriving _after_ we have
370          * called sendmsg(). */
371         while (1) {
372                 req->rq_xtime = jiffies;
373                 status = xs_sendpages(xprt->sock, NULL, 0, xdr,
374                                                 req->rq_bytes_sent);
375
376                 dprintk("RPC:      xs_tcp_send_request(%u) = %d\n",
377                                 xdr->len - req->rq_bytes_sent, status);
378
379                 if (unlikely(status < 0))
380                         break;
381
382                 /* If we've sent the entire packet, immediately
383                  * reset the count of bytes sent. */
384                 req->rq_bytes_sent += status;
385                 task->tk_bytes_sent += status;
386                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
387                         req->rq_bytes_sent = 0;
388                         return 0;
389                 }
390
391                 status = -EAGAIN;
392                 if (retry++ > XS_SENDMSG_RETRY)
393                         break;
394         }
395
396         switch (status) {
397         case -EAGAIN:
398                 xs_nospace(task);
399                 break;
400         case -ECONNREFUSED:
401         case -ECONNRESET:
402         case -ENOTCONN:
403         case -EPIPE:
404                 status = -ENOTCONN;
405                 break;
406         default:
407                 dprintk("RPC:      sendmsg returned unrecognized error %d\n",
408                         -status);
409                 xprt_disconnect(xprt);
410                 break;
411         }
412
413         return status;
414 }
415
416 /**
417  * xs_tcp_release_xprt - clean up after a tcp transmission
418  * @xprt: transport
419  * @task: rpc task
420  *
421  * This cleans up if an error causes us to abort the transmission of a request.
422  * In this case, the socket may need to be reset in order to avoid confusing
423  * the server.
424  */
425 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
426 {
427         struct rpc_rqst *req;
428
429         if (task != xprt->snd_task)
430                 return;
431         if (task == NULL)
432                 goto out_release;
433         req = task->tk_rqstp;
434         if (req->rq_bytes_sent == 0)
435                 goto out_release;
436         if (req->rq_bytes_sent == req->rq_snd_buf.len)
437                 goto out_release;
438         set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
439 out_release:
440         xprt_release_xprt(xprt, task);
441 }
442
443 /**
444  * xs_close - close a socket
445  * @xprt: transport
446  *
447  * This is used when all requests are complete; ie, no DRC state remains
448  * on the server we want to save.
449  */
450 static void xs_close(struct rpc_xprt *xprt)
451 {
452         struct socket *sock = xprt->sock;
453         struct sock *sk = xprt->inet;
454
455         if (!sk)
456                 goto clear_close_wait;
457
458         dprintk("RPC:      xs_close xprt %p\n", xprt);
459
460         write_lock_bh(&sk->sk_callback_lock);
461         xprt->inet = NULL;
462         xprt->sock = NULL;
463
464         sk->sk_user_data = NULL;
465         sk->sk_data_ready = xprt->old_data_ready;
466         sk->sk_state_change = xprt->old_state_change;
467         sk->sk_write_space = xprt->old_write_space;
468         write_unlock_bh(&sk->sk_callback_lock);
469
470         sk->sk_no_check = 0;
471
472         sock_release(sock);
473 clear_close_wait:
474         smp_mb__before_clear_bit();
475         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
476         smp_mb__after_clear_bit();
477 }
478
479 /**
480  * xs_destroy - prepare to shutdown a transport
481  * @xprt: doomed transport
482  *
483  */
484 static void xs_destroy(struct rpc_xprt *xprt)
485 {
486         dprintk("RPC:      xs_destroy xprt %p\n", xprt);
487
488         cancel_delayed_work(&xprt->connect_worker);
489         flush_scheduled_work();
490
491         xprt_disconnect(xprt);
492         xs_close(xprt);
493         kfree(xprt->slot);
494 }
495
496 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
497 {
498         return (struct rpc_xprt *) sk->sk_user_data;
499 }
500
501 /**
502  * xs_udp_data_ready - "data ready" callback for UDP sockets
503  * @sk: socket with data to read
504  * @len: how much data to read
505  *
506  */
507 static void xs_udp_data_ready(struct sock *sk, int len)
508 {
509         struct rpc_task *task;
510         struct rpc_xprt *xprt;
511         struct rpc_rqst *rovr;
512         struct sk_buff *skb;
513         int err, repsize, copied;
514         u32 _xid, *xp;
515
516         read_lock(&sk->sk_callback_lock);
517         dprintk("RPC:      xs_udp_data_ready...\n");
518         if (!(xprt = xprt_from_sock(sk)))
519                 goto out;
520
521         if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
522                 goto out;
523
524         if (xprt->shutdown)
525                 goto dropit;
526
527         repsize = skb->len - sizeof(struct udphdr);
528         if (repsize < 4) {
529                 dprintk("RPC:      impossible RPC reply size %d!\n", repsize);
530                 goto dropit;
531         }
532
533         /* Copy the XID from the skb... */
534         xp = skb_header_pointer(skb, sizeof(struct udphdr),
535                                 sizeof(_xid), &_xid);
536         if (xp == NULL)
537                 goto dropit;
538
539         /* Look up and lock the request corresponding to the given XID */
540         spin_lock(&xprt->transport_lock);
541         rovr = xprt_lookup_rqst(xprt, *xp);
542         if (!rovr)
543                 goto out_unlock;
544         task = rovr->rq_task;
545
546         if ((copied = rovr->rq_private_buf.buflen) > repsize)
547                 copied = repsize;
548
549         /* Suck it into the iovec, verify checksum if not done by hw. */
550         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
551                 goto out_unlock;
552
553         /* Something worked... */
554         dst_confirm(skb->dst);
555
556         xprt_adjust_cwnd(task, copied);
557         xprt_update_rtt(task);
558         xprt_complete_rqst(task, copied);
559
560  out_unlock:
561         spin_unlock(&xprt->transport_lock);
562  dropit:
563         skb_free_datagram(sk, skb);
564  out:
565         read_unlock(&sk->sk_callback_lock);
566 }
567
568 static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
569 {
570         if (len > desc->count)
571                 len = desc->count;
572         if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
573                 dprintk("RPC:      failed to copy %zu bytes from skb. %zu bytes remain\n",
574                                 len, desc->count);
575                 return 0;
576         }
577         desc->offset += len;
578         desc->count -= len;
579         dprintk("RPC:      copied %zu bytes from skb. %zu bytes remain\n",
580                         len, desc->count);
581         return len;
582 }
583
584 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
585 {
586         size_t len, used;
587         char *p;
588
589         p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
590         len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
591         used = xs_tcp_copy_data(desc, p, len);
592         xprt->tcp_offset += used;
593         if (used != len)
594                 return;
595
596         xprt->tcp_reclen = ntohl(xprt->tcp_recm);
597         if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
598                 xprt->tcp_flags |= XPRT_LAST_FRAG;
599         else
600                 xprt->tcp_flags &= ~XPRT_LAST_FRAG;
601         xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
602
603         xprt->tcp_flags &= ~XPRT_COPY_RECM;
604         xprt->tcp_offset = 0;
605
606         /* Sanity check of the record length */
607         if (unlikely(xprt->tcp_reclen < 4)) {
608                 dprintk("RPC:      invalid TCP record fragment length\n");
609                 xprt_disconnect(xprt);
610                 return;
611         }
612         dprintk("RPC:      reading TCP record fragment of length %d\n",
613                         xprt->tcp_reclen);
614 }
615
616 static void xs_tcp_check_recm(struct rpc_xprt *xprt)
617 {
618         dprintk("RPC:      xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
619                         xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
620         if (xprt->tcp_offset == xprt->tcp_reclen) {
621                 xprt->tcp_flags |= XPRT_COPY_RECM;
622                 xprt->tcp_offset = 0;
623                 if (xprt->tcp_flags & XPRT_LAST_FRAG) {
624                         xprt->tcp_flags &= ~XPRT_COPY_DATA;
625                         xprt->tcp_flags |= XPRT_COPY_XID;
626                         xprt->tcp_copied = 0;
627                 }
628         }
629 }
630
631 static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
632 {
633         size_t len, used;
634         char *p;
635
636         len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
637         dprintk("RPC:      reading XID (%Zu bytes)\n", len);
638         p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
639         used = xs_tcp_copy_data(desc, p, len);
640         xprt->tcp_offset += used;
641         if (used != len)
642                 return;
643         xprt->tcp_flags &= ~XPRT_COPY_XID;
644         xprt->tcp_flags |= XPRT_COPY_DATA;
645         xprt->tcp_copied = 4;
646         dprintk("RPC:      reading reply for XID %08x\n",
647                                                 ntohl(xprt->tcp_xid));
648         xs_tcp_check_recm(xprt);
649 }
650
651 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
652 {
653         struct rpc_rqst *req;
654         struct xdr_buf *rcvbuf;
655         size_t len;
656         ssize_t r;
657
658         /* Find and lock the request corresponding to this xid */
659         spin_lock(&xprt->transport_lock);
660         req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
661         if (!req) {
662                 xprt->tcp_flags &= ~XPRT_COPY_DATA;
663                 dprintk("RPC:      XID %08x request not found!\n",
664                                 ntohl(xprt->tcp_xid));
665                 spin_unlock(&xprt->transport_lock);
666                 return;
667         }
668
669         rcvbuf = &req->rq_private_buf;
670         len = desc->count;
671         if (len > xprt->tcp_reclen - xprt->tcp_offset) {
672                 skb_reader_t my_desc;
673
674                 len = xprt->tcp_reclen - xprt->tcp_offset;
675                 memcpy(&my_desc, desc, sizeof(my_desc));
676                 my_desc.count = len;
677                 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
678                                           &my_desc, xs_tcp_copy_data);
679                 desc->count -= r;
680                 desc->offset += r;
681         } else
682                 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
683                                           desc, xs_tcp_copy_data);
684
685         if (r > 0) {
686                 xprt->tcp_copied += r;
687                 xprt->tcp_offset += r;
688         }
689         if (r != len) {
690                 /* Error when copying to the receive buffer,
691                  * usually because we weren't able to allocate
692                  * additional buffer pages. All we can do now
693                  * is turn off XPRT_COPY_DATA, so the request
694                  * will not receive any additional updates,
695                  * and time out.
696                  * Any remaining data from this record will
697                  * be discarded.
698                  */
699                 xprt->tcp_flags &= ~XPRT_COPY_DATA;
700                 dprintk("RPC:      XID %08x truncated request\n",
701                                 ntohl(xprt->tcp_xid));
702                 dprintk("RPC:      xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
703                                 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
704                 goto out;
705         }
706
707         dprintk("RPC:      XID %08x read %Zd bytes\n",
708                         ntohl(xprt->tcp_xid), r);
709         dprintk("RPC:      xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
710                         xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
711
712         if (xprt->tcp_copied == req->rq_private_buf.buflen)
713                 xprt->tcp_flags &= ~XPRT_COPY_DATA;
714         else if (xprt->tcp_offset == xprt->tcp_reclen) {
715                 if (xprt->tcp_flags & XPRT_LAST_FRAG)
716                         xprt->tcp_flags &= ~XPRT_COPY_DATA;
717         }
718
719 out:
720         if (!(xprt->tcp_flags & XPRT_COPY_DATA))
721                 xprt_complete_rqst(req->rq_task, xprt->tcp_copied);
722         spin_unlock(&xprt->transport_lock);
723         xs_tcp_check_recm(xprt);
724 }
725
726 static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
727 {
728         size_t len;
729
730         len = xprt->tcp_reclen - xprt->tcp_offset;
731         if (len > desc->count)
732                 len = desc->count;
733         desc->count -= len;
734         desc->offset += len;
735         xprt->tcp_offset += len;
736         dprintk("RPC:      discarded %Zu bytes\n", len);
737         xs_tcp_check_recm(xprt);
738 }
739
740 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
741 {
742         struct rpc_xprt *xprt = rd_desc->arg.data;
743         skb_reader_t desc = {
744                 .skb    = skb,
745                 .offset = offset,
746                 .count  = len,
747                 .csum   = 0
748         };
749
750         dprintk("RPC:      xs_tcp_data_recv started\n");
751         do {
752                 /* Read in a new fragment marker if necessary */
753                 /* Can we ever really expect to get completely empty fragments? */
754                 if (xprt->tcp_flags & XPRT_COPY_RECM) {
755                         xs_tcp_read_fraghdr(xprt, &desc);
756                         continue;
757                 }
758                 /* Read in the xid if necessary */
759                 if (xprt->tcp_flags & XPRT_COPY_XID) {
760                         xs_tcp_read_xid(xprt, &desc);
761                         continue;
762                 }
763                 /* Read in the request data */
764                 if (xprt->tcp_flags & XPRT_COPY_DATA) {
765                         xs_tcp_read_request(xprt, &desc);
766                         continue;
767                 }
768                 /* Skip over any trailing bytes on short reads */
769                 xs_tcp_read_discard(xprt, &desc);
770         } while (desc.count);
771         dprintk("RPC:      xs_tcp_data_recv done\n");
772         return len - desc.count;
773 }
774
775 /**
776  * xs_tcp_data_ready - "data ready" callback for TCP sockets
777  * @sk: socket with data to read
778  * @bytes: how much data to read
779  *
780  */
781 static void xs_tcp_data_ready(struct sock *sk, int bytes)
782 {
783         struct rpc_xprt *xprt;
784         read_descriptor_t rd_desc;
785
786         read_lock(&sk->sk_callback_lock);
787         dprintk("RPC:      xs_tcp_data_ready...\n");
788         if (!(xprt = xprt_from_sock(sk)))
789                 goto out;
790         if (xprt->shutdown)
791                 goto out;
792
793         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
794         rd_desc.arg.data = xprt;
795         rd_desc.count = 65536;
796         tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
797 out:
798         read_unlock(&sk->sk_callback_lock);
799 }
800
801 /**
802  * xs_tcp_state_change - callback to handle TCP socket state changes
803  * @sk: socket whose state has changed
804  *
805  */
806 static void xs_tcp_state_change(struct sock *sk)
807 {
808         struct rpc_xprt *xprt;
809
810         read_lock(&sk->sk_callback_lock);
811         if (!(xprt = xprt_from_sock(sk)))
812                 goto out;
813         dprintk("RPC:      xs_tcp_state_change client %p...\n", xprt);
814         dprintk("RPC:      state %x conn %d dead %d zapped %d\n",
815                                 sk->sk_state, xprt_connected(xprt),
816                                 sock_flag(sk, SOCK_DEAD),
817                                 sock_flag(sk, SOCK_ZAPPED));
818
819         switch (sk->sk_state) {
820         case TCP_ESTABLISHED:
821                 spin_lock_bh(&xprt->transport_lock);
822                 if (!xprt_test_and_set_connected(xprt)) {
823                         /* Reset TCP record info */
824                         xprt->tcp_offset = 0;
825                         xprt->tcp_reclen = 0;
826                         xprt->tcp_copied = 0;
827                         xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
828                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
829                         xprt_wake_pending_tasks(xprt, 0);
830                 }
831                 spin_unlock_bh(&xprt->transport_lock);
832                 break;
833         case TCP_SYN_SENT:
834         case TCP_SYN_RECV:
835                 break;
836         case TCP_CLOSE_WAIT:
837                 /* Try to schedule an autoclose RPC calls */
838                 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
839                 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
840                         schedule_work(&xprt->task_cleanup);
841         default:
842                 xprt_disconnect(xprt);
843         }
844  out:
845         read_unlock(&sk->sk_callback_lock);
846 }
847
848 /**
849  * xs_udp_write_space - callback invoked when socket buffer space
850  *                             becomes available
851  * @sk: socket whose state has changed
852  *
853  * Called when more output buffer space is available for this socket.
854  * We try not to wake our writers until they can make "significant"
855  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
856  * with a bunch of small requests.
857  */
858 static void xs_udp_write_space(struct sock *sk)
859 {
860         read_lock(&sk->sk_callback_lock);
861
862         /* from net/core/sock.c:sock_def_write_space */
863         if (sock_writeable(sk)) {
864                 struct socket *sock;
865                 struct rpc_xprt *xprt;
866
867                 if (unlikely(!(sock = sk->sk_socket)))
868                         goto out;
869                 if (unlikely(!(xprt = xprt_from_sock(sk))))
870                         goto out;
871                 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
872                         goto out;
873
874                 xprt_write_space(xprt);
875         }
876
877  out:
878         read_unlock(&sk->sk_callback_lock);
879 }
880
881 /**
882  * xs_tcp_write_space - callback invoked when socket buffer space
883  *                             becomes available
884  * @sk: socket whose state has changed
885  *
886  * Called when more output buffer space is available for this socket.
887  * We try not to wake our writers until they can make "significant"
888  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
889  * with a bunch of small requests.
890  */
891 static void xs_tcp_write_space(struct sock *sk)
892 {
893         read_lock(&sk->sk_callback_lock);
894
895         /* from net/core/stream.c:sk_stream_write_space */
896         if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
897                 struct socket *sock;
898                 struct rpc_xprt *xprt;
899
900                 if (unlikely(!(sock = sk->sk_socket)))
901                         goto out;
902                 if (unlikely(!(xprt = xprt_from_sock(sk))))
903                         goto out;
904                 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
905                         goto out;
906
907                 xprt_write_space(xprt);
908         }
909
910  out:
911         read_unlock(&sk->sk_callback_lock);
912 }
913
914 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
915 {
916         struct sock *sk = xprt->inet;
917
918         if (xprt->rcvsize) {
919                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
920                 sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs *  2;
921         }
922         if (xprt->sndsize) {
923                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
924                 sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
925                 sk->sk_write_space(sk);
926         }
927 }
928
929 /**
930  * xs_udp_set_buffer_size - set send and receive limits
931  * @xprt: generic transport
932  * @sndsize: requested size of send buffer, in bytes
933  * @rcvsize: requested size of receive buffer, in bytes
934  *
935  * Set socket send and receive buffer size limits.
936  */
937 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
938 {
939         xprt->sndsize = 0;
940         if (sndsize)
941                 xprt->sndsize = sndsize + 1024;
942         xprt->rcvsize = 0;
943         if (rcvsize)
944                 xprt->rcvsize = rcvsize + 1024;
945
946         xs_udp_do_set_buffer_size(xprt);
947 }
948
949 /**
950  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
951  * @task: task that timed out
952  *
953  * Adjust the congestion window after a retransmit timeout has occurred.
954  */
955 static void xs_udp_timer(struct rpc_task *task)
956 {
957         xprt_adjust_cwnd(task, -ETIMEDOUT);
958 }
959
960 static unsigned short xs_get_random_port(void)
961 {
962         unsigned short range = xprt_max_resvport - xprt_min_resvport;
963         unsigned short rand = (unsigned short) net_random() % range;
964         return rand + xprt_min_resvport;
965 }
966
967 /**
968  * xs_set_port - reset the port number in the remote endpoint address
969  * @xprt: generic transport
970  * @port: new port number
971  *
972  */
973 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
974 {
975         dprintk("RPC:      setting port for xprt %p to %u\n", xprt, port);
976         xprt->addr.sin_port = htons(port);
977 }
978
979 static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
980 {
981         struct sockaddr_in myaddr = {
982                 .sin_family = AF_INET,
983         };
984         int err;
985         unsigned short port = xprt->port;
986
987         do {
988                 myaddr.sin_port = htons(port);
989                 err = sock->ops->bind(sock, (struct sockaddr *) &myaddr,
990                                                 sizeof(myaddr));
991                 if (err == 0) {
992                         xprt->port = port;
993                         dprintk("RPC:      xs_bindresvport bound to port %u\n",
994                                         port);
995                         return 0;
996                 }
997                 if (port <= xprt_min_resvport)
998                         port = xprt_max_resvport;
999                 else
1000                         port--;
1001         } while (err == -EADDRINUSE && port != xprt->port);
1002
1003         dprintk("RPC:      can't bind to reserved port (%d).\n", -err);
1004         return err;
1005 }
1006
1007 /**
1008  * xs_udp_connect_worker - set up a UDP socket
1009  * @args: RPC transport to connect
1010  *
1011  * Invoked by a work queue tasklet.
1012  */
1013 static void xs_udp_connect_worker(void *args)
1014 {
1015         struct rpc_xprt *xprt = (struct rpc_xprt *) args;
1016         struct socket *sock = xprt->sock;
1017         int err, status = -EIO;
1018
1019         if (xprt->shutdown || !xprt_bound(xprt))
1020                 goto out;
1021
1022         dprintk("RPC:      xs_udp_connect_worker for xprt %p\n", xprt);
1023
1024         /* Start by resetting any existing state */
1025         xs_close(xprt);
1026
1027         if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1028                 dprintk("RPC:      can't create UDP transport socket (%d).\n", -err);
1029                 goto out;
1030         }
1031
1032         if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
1033                 sock_release(sock);
1034                 goto out;
1035         }
1036
1037         if (!xprt->inet) {
1038                 struct sock *sk = sock->sk;
1039
1040                 write_lock_bh(&sk->sk_callback_lock);
1041
1042                 sk->sk_user_data = xprt;
1043                 xprt->old_data_ready = sk->sk_data_ready;
1044                 xprt->old_state_change = sk->sk_state_change;
1045                 xprt->old_write_space = sk->sk_write_space;
1046                 sk->sk_data_ready = xs_udp_data_ready;
1047                 sk->sk_write_space = xs_udp_write_space;
1048                 sk->sk_no_check = UDP_CSUM_NORCV;
1049                 sk->sk_allocation = GFP_ATOMIC;
1050
1051                 xprt_set_connected(xprt);
1052
1053                 /* Reset to new socket */
1054                 xprt->sock = sock;
1055                 xprt->inet = sk;
1056
1057                 write_unlock_bh(&sk->sk_callback_lock);
1058         }
1059         xs_udp_do_set_buffer_size(xprt);
1060         status = 0;
1061 out:
1062         xprt_wake_pending_tasks(xprt, status);
1063         xprt_clear_connecting(xprt);
1064 }
1065
1066 /*
1067  * We need to preserve the port number so the reply cache on the server can
1068  * find our cached RPC replies when we get around to reconnecting.
1069  */
1070 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1071 {
1072         int result;
1073         struct socket *sock = xprt->sock;
1074         struct sockaddr any;
1075
1076         dprintk("RPC:      disconnecting xprt %p to reuse port\n", xprt);
1077
1078         /*
1079          * Disconnect the transport socket by doing a connect operation
1080          * with AF_UNSPEC.  This should return immediately...
1081          */
1082         memset(&any, 0, sizeof(any));
1083         any.sa_family = AF_UNSPEC;
1084         result = sock->ops->connect(sock, &any, sizeof(any), 0);
1085         if (result)
1086                 dprintk("RPC:      AF_UNSPEC connect return code %d\n",
1087                                 result);
1088 }
1089
1090 /**
1091  * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1092  * @args: RPC transport to connect
1093  *
1094  * Invoked by a work queue tasklet.
1095  */
1096 static void xs_tcp_connect_worker(void *args)
1097 {
1098         struct rpc_xprt *xprt = (struct rpc_xprt *)args;
1099         struct socket *sock = xprt->sock;
1100         int err, status = -EIO;
1101
1102         if (xprt->shutdown || !xprt_bound(xprt))
1103                 goto out;
1104
1105         dprintk("RPC:      xs_tcp_connect_worker for xprt %p\n", xprt);
1106
1107         if (!xprt->sock) {
1108                 /* start from scratch */
1109                 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1110                         dprintk("RPC:      can't create TCP transport socket (%d).\n", -err);
1111                         goto out;
1112                 }
1113
1114                 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
1115                         sock_release(sock);
1116                         goto out;
1117                 }
1118         } else
1119                 /* "close" the socket, preserving the local port */
1120                 xs_tcp_reuse_connection(xprt);
1121
1122         if (!xprt->inet) {
1123                 struct sock *sk = sock->sk;
1124
1125                 write_lock_bh(&sk->sk_callback_lock);
1126
1127                 sk->sk_user_data = xprt;
1128                 xprt->old_data_ready = sk->sk_data_ready;
1129                 xprt->old_state_change = sk->sk_state_change;
1130                 xprt->old_write_space = sk->sk_write_space;
1131                 sk->sk_data_ready = xs_tcp_data_ready;
1132                 sk->sk_state_change = xs_tcp_state_change;
1133                 sk->sk_write_space = xs_tcp_write_space;
1134                 sk->sk_allocation = GFP_ATOMIC;
1135
1136                 /* socket options */
1137                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1138                 sock_reset_flag(sk, SOCK_LINGER);
1139                 tcp_sk(sk)->linger2 = 0;
1140                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1141
1142                 xprt_clear_connected(xprt);
1143
1144                 /* Reset to new socket */
1145                 xprt->sock = sock;
1146                 xprt->inet = sk;
1147
1148                 write_unlock_bh(&sk->sk_callback_lock);
1149         }
1150
1151         /* Tell the socket layer to start connecting... */
1152         xprt->stat.connect_count++;
1153         xprt->stat.connect_start = jiffies;
1154         status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr,
1155                         sizeof(xprt->addr), O_NONBLOCK);
1156         dprintk("RPC: %p  connect status %d connected %d sock state %d\n",
1157                         xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1158         if (status < 0) {
1159                 switch (status) {
1160                         case -EINPROGRESS:
1161                         case -EALREADY:
1162                                 goto out_clear;
1163                         case -ECONNREFUSED:
1164                         case -ECONNRESET:
1165                                 /* retry with existing socket, after a delay */
1166                                 break;
1167                         default:
1168                                 /* get rid of existing socket, and retry */
1169                                 xs_close(xprt);
1170                                 break;
1171                 }
1172         }
1173 out:
1174         xprt_wake_pending_tasks(xprt, status);
1175 out_clear:
1176         xprt_clear_connecting(xprt);
1177 }
1178
1179 /**
1180  * xs_connect - connect a socket to a remote endpoint
1181  * @task: address of RPC task that manages state of connect request
1182  *
1183  * TCP: If the remote end dropped the connection, delay reconnecting.
1184  *
1185  * UDP socket connects are synchronous, but we use a work queue anyway
1186  * to guarantee that even unprivileged user processes can set up a
1187  * socket on a privileged port.
1188  *
1189  * If a UDP socket connect fails, the delay behavior here prevents
1190  * retry floods (hard mounts).
1191  */
1192 static void xs_connect(struct rpc_task *task)
1193 {
1194         struct rpc_xprt *xprt = task->tk_xprt;
1195
1196         if (xprt_test_and_set_connecting(xprt))
1197                 return;
1198
1199         if (xprt->sock != NULL) {
1200                 dprintk("RPC:      xs_connect delayed xprt %p for %lu seconds\n",
1201                                 xprt, xprt->reestablish_timeout / HZ);
1202                 schedule_delayed_work(&xprt->connect_worker,
1203                                         xprt->reestablish_timeout);
1204                 xprt->reestablish_timeout <<= 1;
1205                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1206                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1207         } else {
1208                 dprintk("RPC:      xs_connect scheduled xprt %p\n", xprt);
1209                 schedule_work(&xprt->connect_worker);
1210
1211                 /* flush_scheduled_work can sleep... */
1212                 if (!RPC_IS_ASYNC(task))
1213                         flush_scheduled_work();
1214         }
1215 }
1216
1217 /**
1218  * xs_udp_print_stats - display UDP socket-specifc stats
1219  * @xprt: rpc_xprt struct containing statistics
1220  * @seq: output file
1221  *
1222  */
1223 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1224 {
1225         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1226                         xprt->port,
1227                         xprt->stat.bind_count,
1228                         xprt->stat.sends,
1229                         xprt->stat.recvs,
1230                         xprt->stat.bad_xids,
1231                         xprt->stat.req_u,
1232                         xprt->stat.bklog_u);
1233 }
1234
1235 /**
1236  * xs_tcp_print_stats - display TCP socket-specifc stats
1237  * @xprt: rpc_xprt struct containing statistics
1238  * @seq: output file
1239  *
1240  */
1241 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1242 {
1243         long idle_time = 0;
1244
1245         if (xprt_connected(xprt))
1246                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1247
1248         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1249                         xprt->port,
1250                         xprt->stat.bind_count,
1251                         xprt->stat.connect_count,
1252                         xprt->stat.connect_time,
1253                         idle_time,
1254                         xprt->stat.sends,
1255                         xprt->stat.recvs,
1256                         xprt->stat.bad_xids,
1257                         xprt->stat.req_u,
1258                         xprt->stat.bklog_u);
1259 }
1260
1261 static struct rpc_xprt_ops xs_udp_ops = {
1262         .set_buffer_size        = xs_udp_set_buffer_size,
1263         .reserve_xprt           = xprt_reserve_xprt_cong,
1264         .release_xprt           = xprt_release_xprt_cong,
1265         .rpcbind                = rpc_getport,
1266         .set_port               = xs_set_port,
1267         .connect                = xs_connect,
1268         .buf_alloc              = rpc_malloc,
1269         .buf_free               = rpc_free,
1270         .send_request           = xs_udp_send_request,
1271         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
1272         .timer                  = xs_udp_timer,
1273         .release_request        = xprt_release_rqst_cong,
1274         .close                  = xs_close,
1275         .destroy                = xs_destroy,
1276         .print_stats            = xs_udp_print_stats,
1277 };
1278
1279 static struct rpc_xprt_ops xs_tcp_ops = {
1280         .reserve_xprt           = xprt_reserve_xprt,
1281         .release_xprt           = xs_tcp_release_xprt,
1282         .rpcbind                = rpc_getport,
1283         .set_port               = xs_set_port,
1284         .connect                = xs_connect,
1285         .buf_alloc              = rpc_malloc,
1286         .buf_free               = rpc_free,
1287         .send_request           = xs_tcp_send_request,
1288         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
1289         .close                  = xs_close,
1290         .destroy                = xs_destroy,
1291         .print_stats            = xs_tcp_print_stats,
1292 };
1293
1294 /**
1295  * xs_setup_udp - Set up transport to use a UDP socket
1296  * @xprt: transport to set up
1297  * @to:   timeout parameters
1298  *
1299  */
1300 int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1301 {
1302         size_t slot_table_size;
1303
1304         dprintk("RPC:      setting up udp-ipv4 transport...\n");
1305
1306         xprt->max_reqs = xprt_udp_slot_table_entries;
1307         slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1308         xprt->slot = kzalloc(slot_table_size, GFP_KERNEL);
1309         if (xprt->slot == NULL)
1310                 return -ENOMEM;
1311
1312         if (ntohs(xprt->addr.sin_port) != 0)
1313                 xprt_set_bound(xprt);
1314         xprt->port = xs_get_random_port();
1315
1316         xprt->prot = IPPROTO_UDP;
1317         xprt->tsh_size = 0;
1318         xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1319         /* XXX: header size can vary due to auth type, IPv6, etc. */
1320         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1321
1322         INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt);
1323         xprt->bind_timeout = XS_BIND_TO;
1324         xprt->connect_timeout = XS_UDP_CONN_TO;
1325         xprt->reestablish_timeout = XS_UDP_REEST_TO;
1326         xprt->idle_timeout = XS_IDLE_DISC_TO;
1327
1328         xprt->ops = &xs_udp_ops;
1329
1330         if (to)
1331                 xprt->timeout = *to;
1332         else
1333                 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1334
1335         return 0;
1336 }
1337
1338 /**
1339  * xs_setup_tcp - Set up transport to use a TCP socket
1340  * @xprt: transport to set up
1341  * @to: timeout parameters
1342  *
1343  */
1344 int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1345 {
1346         size_t slot_table_size;
1347
1348         dprintk("RPC:      setting up tcp-ipv4 transport...\n");
1349
1350         xprt->max_reqs = xprt_tcp_slot_table_entries;
1351         slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1352         xprt->slot = kzalloc(slot_table_size, GFP_KERNEL);
1353         if (xprt->slot == NULL)
1354                 return -ENOMEM;
1355
1356         if (ntohs(xprt->addr.sin_port) != 0)
1357                 xprt_set_bound(xprt);
1358         xprt->port = xs_get_random_port();
1359
1360         xprt->prot = IPPROTO_TCP;
1361         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1362         xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1363         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1364
1365         INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt);
1366         xprt->bind_timeout = XS_BIND_TO;
1367         xprt->connect_timeout = XS_TCP_CONN_TO;
1368         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1369         xprt->idle_timeout = XS_IDLE_DISC_TO;
1370
1371         xprt->ops = &xs_tcp_ops;
1372
1373         if (to)
1374                 xprt->timeout = *to;
1375         else
1376                 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1377
1378         return 0;
1379 }