Commit | Line | Data |
---|---|---|
a246b010 CL |
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> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
a246b010 CL |
16 | */ |
17 | ||
18 | #include <linux/types.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/capability.h> | |
a246b010 CL |
21 | #include <linux/pagemap.h> |
22 | #include <linux/errno.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/net.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/udp.h> | |
28 | #include <linux/tcp.h> | |
29 | #include <linux/sunrpc/clnt.h> | |
02107148 | 30 | #include <linux/sunrpc/sched.h> |
a246b010 CL |
31 | #include <linux/file.h> |
32 | ||
33 | #include <net/sock.h> | |
34 | #include <net/checksum.h> | |
35 | #include <net/udp.h> | |
36 | #include <net/tcp.h> | |
37 | ||
c556b754 CL |
38 | /* |
39 | * xprtsock tunables | |
40 | */ | |
41 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
42 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
43 | ||
44 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
45 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
46 | ||
fbf76683 CL |
47 | /* |
48 | * We can register our own files under /proc/sys/sunrpc by | |
49 | * calling register_sysctl_table() again. The files in that | |
50 | * directory become the union of all files registered there. | |
51 | * | |
52 | * We simply need to make sure that we don't collide with | |
53 | * someone else's file names! | |
54 | */ | |
55 | ||
56 | #ifdef RPC_DEBUG | |
57 | ||
58 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
59 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
60 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
61 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
62 | ||
63 | static struct ctl_table_header *sunrpc_table_header; | |
64 | ||
65 | /* | |
66 | * FIXME: changing the UDP slot table size should also resize the UDP | |
67 | * socket buffers for existing UDP transports | |
68 | */ | |
69 | static ctl_table xs_tunables_table[] = { | |
70 | { | |
71 | .ctl_name = CTL_SLOTTABLE_UDP, | |
72 | .procname = "udp_slot_table_entries", | |
73 | .data = &xprt_udp_slot_table_entries, | |
74 | .maxlen = sizeof(unsigned int), | |
75 | .mode = 0644, | |
76 | .proc_handler = &proc_dointvec_minmax, | |
77 | .strategy = &sysctl_intvec, | |
78 | .extra1 = &min_slot_table_size, | |
79 | .extra2 = &max_slot_table_size | |
80 | }, | |
81 | { | |
82 | .ctl_name = CTL_SLOTTABLE_TCP, | |
83 | .procname = "tcp_slot_table_entries", | |
84 | .data = &xprt_tcp_slot_table_entries, | |
85 | .maxlen = sizeof(unsigned int), | |
86 | .mode = 0644, | |
87 | .proc_handler = &proc_dointvec_minmax, | |
88 | .strategy = &sysctl_intvec, | |
89 | .extra1 = &min_slot_table_size, | |
90 | .extra2 = &max_slot_table_size | |
91 | }, | |
92 | { | |
93 | .ctl_name = CTL_MIN_RESVPORT, | |
94 | .procname = "min_resvport", | |
95 | .data = &xprt_min_resvport, | |
96 | .maxlen = sizeof(unsigned int), | |
97 | .mode = 0644, | |
98 | .proc_handler = &proc_dointvec_minmax, | |
99 | .strategy = &sysctl_intvec, | |
100 | .extra1 = &xprt_min_resvport_limit, | |
101 | .extra2 = &xprt_max_resvport_limit | |
102 | }, | |
103 | { | |
104 | .ctl_name = CTL_MAX_RESVPORT, | |
105 | .procname = "max_resvport", | |
106 | .data = &xprt_max_resvport, | |
107 | .maxlen = sizeof(unsigned int), | |
108 | .mode = 0644, | |
109 | .proc_handler = &proc_dointvec_minmax, | |
110 | .strategy = &sysctl_intvec, | |
111 | .extra1 = &xprt_min_resvport_limit, | |
112 | .extra2 = &xprt_max_resvport_limit | |
113 | }, | |
114 | { | |
115 | .ctl_name = 0, | |
116 | }, | |
117 | }; | |
118 | ||
119 | static ctl_table sunrpc_table[] = { | |
120 | { | |
121 | .ctl_name = CTL_SUNRPC, | |
122 | .procname = "sunrpc", | |
123 | .mode = 0555, | |
124 | .child = xs_tunables_table | |
125 | }, | |
126 | { | |
127 | .ctl_name = 0, | |
128 | }, | |
129 | }; | |
130 | ||
131 | #endif | |
132 | ||
262965f5 CL |
133 | /* |
134 | * How many times to try sending a request on a socket before waiting | |
135 | * for the socket buffer to clear. | |
136 | */ | |
137 | #define XS_SENDMSG_RETRY (10U) | |
138 | ||
03bf4b70 CL |
139 | /* |
140 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
141 | * synchronous, but we set a timeout anyway in case of resource | |
142 | * exhaustion on the local host. | |
143 | */ | |
144 | #define XS_UDP_CONN_TO (5U * HZ) | |
145 | ||
146 | /* | |
147 | * Wait duration for an RPC TCP connection to be established. Solaris | |
148 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
149 | * long a server takes to reboot. | |
150 | */ | |
151 | #define XS_TCP_CONN_TO (60U * HZ) | |
152 | ||
153 | /* | |
154 | * Wait duration for a reply from the RPC portmapper. | |
155 | */ | |
156 | #define XS_BIND_TO (60U * HZ) | |
157 | ||
158 | /* | |
159 | * Delay if a UDP socket connect error occurs. This is most likely some | |
160 | * kind of resource problem on the local host. | |
161 | */ | |
162 | #define XS_UDP_REEST_TO (2U * HZ) | |
163 | ||
164 | /* | |
165 | * The reestablish timeout allows clients to delay for a bit before attempting | |
166 | * to reconnect to a server that just dropped our connection. | |
167 | * | |
168 | * We implement an exponential backoff when trying to reestablish a TCP | |
169 | * transport connection with the server. Some servers like to drop a TCP | |
170 | * connection when they are overworked, so we start with a short timeout and | |
171 | * increase over time if the server is down or not responding. | |
172 | */ | |
173 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
174 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
175 | ||
176 | /* | |
177 | * TCP idle timeout; client drops the transport socket if it is idle | |
178 | * for this long. Note that we also timeout UDP sockets to prevent | |
179 | * holding port numbers when there is no RPC traffic. | |
180 | */ | |
181 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
182 | ||
a246b010 CL |
183 | #ifdef RPC_DEBUG |
184 | # undef RPC_DEBUG_DATA | |
9903cd1c | 185 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
186 | #endif |
187 | ||
a246b010 | 188 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 189 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 190 | { |
9903cd1c CL |
191 | u8 *buf = (u8 *) packet; |
192 | int j; | |
a246b010 | 193 | |
46121cf7 | 194 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
195 | for (j = 0; j < count && j < 128; j += 4) { |
196 | if (!(j & 31)) { | |
197 | if (j) | |
198 | dprintk("\n"); | |
199 | dprintk("0x%04x ", j); | |
200 | } | |
201 | dprintk("%02x%02x%02x%02x ", | |
202 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
203 | } | |
204 | dprintk("\n"); | |
205 | } | |
206 | #else | |
9903cd1c | 207 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
208 | { |
209 | /* NOP */ | |
210 | } | |
211 | #endif | |
212 | ||
ffc2e518 CL |
213 | struct sock_xprt { |
214 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
215 | |
216 | /* | |
217 | * Network layer | |
218 | */ | |
219 | struct socket * sock; | |
220 | struct sock * inet; | |
51971139 CL |
221 | |
222 | /* | |
223 | * State of TCP reply receive | |
224 | */ | |
225 | __be32 tcp_fraghdr, | |
226 | tcp_xid; | |
227 | ||
228 | u32 tcp_offset, | |
229 | tcp_reclen; | |
230 | ||
231 | unsigned long tcp_copied, | |
232 | tcp_flags; | |
c8475461 CL |
233 | |
234 | /* | |
235 | * Connection of transports | |
236 | */ | |
34161db6 | 237 | struct delayed_work connect_worker; |
d3bc9a1d | 238 | struct sockaddr_storage addr; |
c8475461 | 239 | unsigned short port; |
7c6e066e CL |
240 | |
241 | /* | |
242 | * UDP socket buffer size parameters | |
243 | */ | |
244 | size_t rcvsize, | |
245 | sndsize; | |
314dfd79 CL |
246 | |
247 | /* | |
248 | * Saved socket callback addresses | |
249 | */ | |
250 | void (*old_data_ready)(struct sock *, int); | |
251 | void (*old_state_change)(struct sock *); | |
252 | void (*old_write_space)(struct sock *); | |
ffc2e518 CL |
253 | }; |
254 | ||
e136d092 CL |
255 | /* |
256 | * TCP receive state flags | |
257 | */ | |
258 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
259 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
260 | #define TCP_RCV_COPY_XID (1UL << 2) | |
261 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
262 | ||
edb267a6 CL |
263 | static void xs_format_peer_addresses(struct rpc_xprt *xprt) |
264 | { | |
265 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; | |
266 | char *buf; | |
267 | ||
268 | buf = kzalloc(20, GFP_KERNEL); | |
269 | if (buf) { | |
bda243df | 270 | snprintf(buf, 20, NIPQUAD_FMT, |
edb267a6 CL |
271 | NIPQUAD(addr->sin_addr.s_addr)); |
272 | } | |
273 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
274 | ||
275 | buf = kzalloc(8, GFP_KERNEL); | |
276 | if (buf) { | |
277 | snprintf(buf, 8, "%u", | |
278 | ntohs(addr->sin_port)); | |
279 | } | |
280 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
281 | ||
0c43b3d8 CL |
282 | buf = kzalloc(8, GFP_KERNEL); |
283 | if (buf) { | |
284 | if (xprt->prot == IPPROTO_UDP) | |
285 | snprintf(buf, 8, "udp"); | |
286 | else | |
287 | snprintf(buf, 8, "tcp"); | |
288 | } | |
289 | xprt->address_strings[RPC_DISPLAY_PROTO] = buf; | |
edb267a6 CL |
290 | |
291 | buf = kzalloc(48, GFP_KERNEL); | |
292 | if (buf) { | |
bda243df | 293 | snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", |
edb267a6 CL |
294 | NIPQUAD(addr->sin_addr.s_addr), |
295 | ntohs(addr->sin_port), | |
296 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
297 | } | |
298 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
fbfe3cc6 CL |
299 | |
300 | buf = kzalloc(10, GFP_KERNEL); | |
301 | if (buf) { | |
302 | snprintf(buf, 10, "%02x%02x%02x%02x", | |
303 | NIPQUAD(addr->sin_addr.s_addr)); | |
304 | } | |
305 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
306 | ||
307 | buf = kzalloc(8, GFP_KERNEL); | |
308 | if (buf) { | |
309 | snprintf(buf, 8, "%4hx", | |
310 | ntohs(addr->sin_port)); | |
311 | } | |
312 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
edb267a6 CL |
313 | } |
314 | ||
315 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) | |
316 | { | |
0c43b3d8 CL |
317 | int i; |
318 | ||
319 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
320 | kfree(xprt->address_strings[i]); | |
edb267a6 CL |
321 | } |
322 | ||
b4b5cc85 CL |
323 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
324 | ||
24c5684b | 325 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 326 | { |
b4b5cc85 CL |
327 | struct msghdr msg = { |
328 | .msg_name = addr, | |
329 | .msg_namelen = addrlen, | |
24c5684b TM |
330 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
331 | }; | |
332 | struct kvec iov = { | |
333 | .iov_base = vec->iov_base + base, | |
334 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
335 | }; |
336 | ||
24c5684b | 337 | if (iov.iov_len != 0) |
b4b5cc85 CL |
338 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
339 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
340 | } | |
341 | ||
24c5684b | 342 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 343 | { |
24c5684b TM |
344 | struct page **ppage; |
345 | unsigned int remainder; | |
346 | int err, sent = 0; | |
347 | ||
348 | remainder = xdr->page_len - base; | |
349 | base += xdr->page_base; | |
350 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
351 | base &= ~PAGE_MASK; | |
352 | for(;;) { | |
353 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
354 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 355 | |
24c5684b TM |
356 | remainder -= len; |
357 | if (remainder != 0 || more) | |
358 | flags |= MSG_MORE; | |
359 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
360 | if (remainder == 0 || err != len) | |
361 | break; | |
362 | sent += err; | |
363 | ppage++; | |
364 | base = 0; | |
365 | } | |
366 | if (sent == 0) | |
367 | return err; | |
368 | if (err > 0) | |
369 | sent += err; | |
370 | return sent; | |
b4b5cc85 CL |
371 | } |
372 | ||
9903cd1c CL |
373 | /** |
374 | * xs_sendpages - write pages directly to a socket | |
375 | * @sock: socket to send on | |
376 | * @addr: UDP only -- address of destination | |
377 | * @addrlen: UDP only -- length of destination address | |
378 | * @xdr: buffer containing this request | |
379 | * @base: starting position in the buffer | |
380 | * | |
a246b010 | 381 | */ |
24c5684b | 382 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 383 | { |
24c5684b TM |
384 | unsigned int remainder = xdr->len - base; |
385 | int err, sent = 0; | |
a246b010 | 386 | |
262965f5 CL |
387 | if (unlikely(!sock)) |
388 | return -ENOTCONN; | |
389 | ||
390 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
391 | if (base != 0) { |
392 | addr = NULL; | |
393 | addrlen = 0; | |
394 | } | |
262965f5 | 395 | |
24c5684b TM |
396 | if (base < xdr->head[0].iov_len || addr != NULL) { |
397 | unsigned int len = xdr->head[0].iov_len - base; | |
398 | remainder -= len; | |
399 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
400 | if (remainder == 0 || err != len) | |
a246b010 | 401 | goto out; |
24c5684b | 402 | sent += err; |
a246b010 CL |
403 | base = 0; |
404 | } else | |
24c5684b | 405 | base -= xdr->head[0].iov_len; |
a246b010 | 406 | |
24c5684b TM |
407 | if (base < xdr->page_len) { |
408 | unsigned int len = xdr->page_len - base; | |
409 | remainder -= len; | |
410 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
411 | if (remainder == 0 || err != len) | |
a246b010 | 412 | goto out; |
24c5684b | 413 | sent += err; |
a246b010 | 414 | base = 0; |
24c5684b TM |
415 | } else |
416 | base -= xdr->page_len; | |
417 | ||
418 | if (base >= xdr->tail[0].iov_len) | |
419 | return sent; | |
420 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 421 | out: |
24c5684b TM |
422 | if (sent == 0) |
423 | return err; | |
424 | if (err > 0) | |
425 | sent += err; | |
426 | return sent; | |
a246b010 CL |
427 | } |
428 | ||
9903cd1c | 429 | /** |
262965f5 CL |
430 | * xs_nospace - place task on wait queue if transmit was incomplete |
431 | * @task: task to put to sleep | |
9903cd1c | 432 | * |
a246b010 | 433 | */ |
262965f5 | 434 | static void xs_nospace(struct rpc_task *task) |
a246b010 | 435 | { |
262965f5 CL |
436 | struct rpc_rqst *req = task->tk_rqstp; |
437 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 438 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 439 | |
46121cf7 | 440 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
441 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
442 | req->rq_slen); | |
443 | ||
ee0ac0c2 | 444 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
262965f5 CL |
445 | /* Protect against races with write_space */ |
446 | spin_lock_bh(&xprt->transport_lock); | |
447 | ||
448 | /* Don't race with disconnect */ | |
449 | if (!xprt_connected(xprt)) | |
450 | task->tk_status = -ENOTCONN; | |
ee0ac0c2 | 451 | else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) |
262965f5 CL |
452 | xprt_wait_for_buffer_space(task); |
453 | ||
454 | spin_unlock_bh(&xprt->transport_lock); | |
455 | } else | |
456 | /* Keep holding the socket if it is blocked */ | |
457 | rpc_delay(task, HZ>>4); | |
458 | } | |
459 | ||
460 | /** | |
461 | * xs_udp_send_request - write an RPC request to a UDP socket | |
462 | * @task: address of RPC task that manages the state of an RPC request | |
463 | * | |
464 | * Return values: | |
465 | * 0: The request has been sent | |
466 | * EAGAIN: The socket was blocked, please call again later to | |
467 | * complete the request | |
468 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
469 | * other: Some other error occured, the request was not sent | |
470 | */ | |
471 | static int xs_udp_send_request(struct rpc_task *task) | |
472 | { | |
473 | struct rpc_rqst *req = task->tk_rqstp; | |
474 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 475 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
476 | struct xdr_buf *xdr = &req->rq_snd_buf; |
477 | int status; | |
a246b010 | 478 | |
9903cd1c | 479 | xs_pktdump("packet data:", |
a246b010 CL |
480 | req->rq_svec->iov_base, |
481 | req->rq_svec->iov_len); | |
482 | ||
262965f5 | 483 | req->rq_xtime = jiffies; |
ee0ac0c2 CL |
484 | status = xs_sendpages(transport->sock, |
485 | (struct sockaddr *) &xprt->addr, | |
486 | xprt->addrlen, xdr, | |
487 | req->rq_bytes_sent); | |
a246b010 | 488 | |
46121cf7 | 489 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 490 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 491 | |
262965f5 CL |
492 | if (likely(status >= (int) req->rq_slen)) |
493 | return 0; | |
a246b010 | 494 | |
262965f5 CL |
495 | /* Still some bytes left; set up for a retry later. */ |
496 | if (status > 0) | |
497 | status = -EAGAIN; | |
a246b010 | 498 | |
262965f5 CL |
499 | switch (status) { |
500 | case -ENETUNREACH: | |
501 | case -EPIPE: | |
a246b010 CL |
502 | case -ECONNREFUSED: |
503 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 504 | * prompts ECONNREFUSED. */ |
a246b010 | 505 | break; |
262965f5 CL |
506 | case -EAGAIN: |
507 | xs_nospace(task); | |
a246b010 CL |
508 | break; |
509 | default: | |
46121cf7 | 510 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
262965f5 | 511 | -status); |
9903cd1c | 512 | break; |
a246b010 | 513 | } |
262965f5 CL |
514 | |
515 | return status; | |
a246b010 CL |
516 | } |
517 | ||
808012fb CL |
518 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
519 | { | |
520 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
521 | rpc_fraghdr *base = buf->head[0].iov_base; | |
522 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
523 | } | |
524 | ||
9903cd1c | 525 | /** |
262965f5 | 526 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
527 | * @task: address of RPC task that manages the state of an RPC request |
528 | * | |
529 | * Return values: | |
262965f5 CL |
530 | * 0: The request has been sent |
531 | * EAGAIN: The socket was blocked, please call again later to | |
532 | * complete the request | |
533 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
534 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
535 | * |
536 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 537 | * if sendmsg is not able to make progress? |
9903cd1c | 538 | */ |
262965f5 | 539 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
540 | { |
541 | struct rpc_rqst *req = task->tk_rqstp; | |
542 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 543 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 544 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 CL |
545 | int status; |
546 | unsigned int retry = 0; | |
a246b010 | 547 | |
808012fb | 548 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 549 | |
262965f5 CL |
550 | xs_pktdump("packet data:", |
551 | req->rq_svec->iov_base, | |
552 | req->rq_svec->iov_len); | |
a246b010 CL |
553 | |
554 | /* Continue transmitting the packet/record. We must be careful | |
555 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 556 | * called sendmsg(). */ |
a246b010 CL |
557 | while (1) { |
558 | req->rq_xtime = jiffies; | |
ee0ac0c2 CL |
559 | status = xs_sendpages(transport->sock, |
560 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 561 | |
46121cf7 | 562 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 563 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 564 | |
262965f5 | 565 | if (unlikely(status < 0)) |
a246b010 | 566 | break; |
a246b010 | 567 | |
262965f5 CL |
568 | /* If we've sent the entire packet, immediately |
569 | * reset the count of bytes sent. */ | |
570 | req->rq_bytes_sent += status; | |
ef759a2e | 571 | task->tk_bytes_sent += status; |
262965f5 CL |
572 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
573 | req->rq_bytes_sent = 0; | |
574 | return 0; | |
575 | } | |
a246b010 CL |
576 | |
577 | status = -EAGAIN; | |
262965f5 | 578 | if (retry++ > XS_SENDMSG_RETRY) |
a246b010 CL |
579 | break; |
580 | } | |
581 | ||
262965f5 CL |
582 | switch (status) { |
583 | case -EAGAIN: | |
584 | xs_nospace(task); | |
585 | break; | |
586 | case -ECONNREFUSED: | |
587 | case -ECONNRESET: | |
588 | case -ENOTCONN: | |
589 | case -EPIPE: | |
590 | status = -ENOTCONN; | |
591 | break; | |
592 | default: | |
46121cf7 | 593 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
262965f5 | 594 | -status); |
43118c29 | 595 | xprt_disconnect(xprt); |
262965f5 | 596 | break; |
a246b010 | 597 | } |
262965f5 | 598 | |
a246b010 CL |
599 | return status; |
600 | } | |
601 | ||
e0ab53de TM |
602 | /** |
603 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
604 | * @xprt: transport | |
605 | * @task: rpc task | |
606 | * | |
607 | * This cleans up if an error causes us to abort the transmission of a request. | |
608 | * In this case, the socket may need to be reset in order to avoid confusing | |
609 | * the server. | |
610 | */ | |
611 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
612 | { | |
613 | struct rpc_rqst *req; | |
614 | ||
615 | if (task != xprt->snd_task) | |
616 | return; | |
617 | if (task == NULL) | |
618 | goto out_release; | |
619 | req = task->tk_rqstp; | |
620 | if (req->rq_bytes_sent == 0) | |
621 | goto out_release; | |
622 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
623 | goto out_release; | |
624 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
625 | out_release: | |
626 | xprt_release_xprt(xprt, task); | |
627 | } | |
628 | ||
9903cd1c CL |
629 | /** |
630 | * xs_close - close a socket | |
631 | * @xprt: transport | |
632 | * | |
3167e12c CL |
633 | * This is used when all requests are complete; ie, no DRC state remains |
634 | * on the server we want to save. | |
a246b010 | 635 | */ |
9903cd1c | 636 | static void xs_close(struct rpc_xprt *xprt) |
a246b010 | 637 | { |
ee0ac0c2 CL |
638 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
639 | struct socket *sock = transport->sock; | |
640 | struct sock *sk = transport->inet; | |
a246b010 CL |
641 | |
642 | if (!sk) | |
632e3bdc | 643 | goto clear_close_wait; |
a246b010 | 644 | |
46121cf7 | 645 | dprintk("RPC: xs_close xprt %p\n", xprt); |
9903cd1c | 646 | |
a246b010 | 647 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
648 | transport->inet = NULL; |
649 | transport->sock = NULL; | |
a246b010 | 650 | |
9903cd1c | 651 | sk->sk_user_data = NULL; |
314dfd79 CL |
652 | sk->sk_data_ready = transport->old_data_ready; |
653 | sk->sk_state_change = transport->old_state_change; | |
654 | sk->sk_write_space = transport->old_write_space; | |
a246b010 CL |
655 | write_unlock_bh(&sk->sk_callback_lock); |
656 | ||
9903cd1c | 657 | sk->sk_no_check = 0; |
a246b010 CL |
658 | |
659 | sock_release(sock); | |
632e3bdc TM |
660 | clear_close_wait: |
661 | smp_mb__before_clear_bit(); | |
662 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
663 | smp_mb__after_clear_bit(); | |
a246b010 CL |
664 | } |
665 | ||
9903cd1c CL |
666 | /** |
667 | * xs_destroy - prepare to shutdown a transport | |
668 | * @xprt: doomed transport | |
669 | * | |
670 | */ | |
671 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 672 | { |
c8475461 CL |
673 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
674 | ||
46121cf7 | 675 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 676 | |
c1384c9c | 677 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 CL |
678 | |
679 | xprt_disconnect(xprt); | |
9903cd1c | 680 | xs_close(xprt); |
edb267a6 | 681 | xs_free_peer_addresses(xprt); |
a246b010 | 682 | kfree(xprt->slot); |
c8541ecd | 683 | kfree(xprt); |
a246b010 CL |
684 | } |
685 | ||
9903cd1c CL |
686 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
687 | { | |
688 | return (struct rpc_xprt *) sk->sk_user_data; | |
689 | } | |
690 | ||
691 | /** | |
692 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
693 | * @sk: socket with data to read | |
694 | * @len: how much data to read | |
695 | * | |
a246b010 | 696 | */ |
9903cd1c | 697 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 698 | { |
9903cd1c CL |
699 | struct rpc_task *task; |
700 | struct rpc_xprt *xprt; | |
a246b010 | 701 | struct rpc_rqst *rovr; |
9903cd1c | 702 | struct sk_buff *skb; |
a246b010 | 703 | int err, repsize, copied; |
d8ed029d AD |
704 | u32 _xid; |
705 | __be32 *xp; | |
a246b010 CL |
706 | |
707 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 708 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 709 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 710 | goto out; |
a246b010 CL |
711 | |
712 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
713 | goto out; | |
714 | ||
715 | if (xprt->shutdown) | |
716 | goto dropit; | |
717 | ||
718 | repsize = skb->len - sizeof(struct udphdr); | |
719 | if (repsize < 4) { | |
46121cf7 | 720 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
721 | goto dropit; |
722 | } | |
723 | ||
724 | /* Copy the XID from the skb... */ | |
725 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
726 | sizeof(_xid), &_xid); | |
727 | if (xp == NULL) | |
728 | goto dropit; | |
729 | ||
730 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 731 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
732 | rovr = xprt_lookup_rqst(xprt, *xp); |
733 | if (!rovr) | |
734 | goto out_unlock; | |
735 | task = rovr->rq_task; | |
736 | ||
a246b010 CL |
737 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
738 | copied = repsize; | |
739 | ||
740 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
741 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) | |
742 | goto out_unlock; | |
743 | ||
744 | /* Something worked... */ | |
745 | dst_confirm(skb->dst); | |
746 | ||
1570c1e4 CL |
747 | xprt_adjust_cwnd(task, copied); |
748 | xprt_update_rtt(task); | |
749 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
750 | |
751 | out_unlock: | |
4a0f8c04 | 752 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
753 | dropit: |
754 | skb_free_datagram(sk, skb); | |
755 | out: | |
756 | read_unlock(&sk->sk_callback_lock); | |
757 | } | |
758 | ||
dd456471 | 759 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 760 | { |
51971139 | 761 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
762 | size_t len, used; |
763 | char *p; | |
764 | ||
51971139 CL |
765 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
766 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 767 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 768 | transport->tcp_offset += used; |
a246b010 CL |
769 | if (used != len) |
770 | return; | |
808012fb | 771 | |
51971139 CL |
772 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
773 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 774 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 775 | else |
e136d092 | 776 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 777 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 778 | |
e136d092 | 779 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 780 | transport->tcp_offset = 0; |
808012fb | 781 | |
a246b010 | 782 | /* Sanity check of the record length */ |
51971139 | 783 | if (unlikely(transport->tcp_reclen < 4)) { |
46121cf7 | 784 | dprintk("RPC: invalid TCP record fragment length\n"); |
a246b010 | 785 | xprt_disconnect(xprt); |
9903cd1c | 786 | return; |
a246b010 | 787 | } |
46121cf7 | 788 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 789 | transport->tcp_reclen); |
a246b010 CL |
790 | } |
791 | ||
51971139 | 792 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 793 | { |
51971139 | 794 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 795 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 796 | transport->tcp_offset = 0; |
e136d092 CL |
797 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
798 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
799 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 800 | transport->tcp_copied = 0; |
a246b010 CL |
801 | } |
802 | } | |
803 | } | |
804 | ||
dd456471 | 805 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
806 | { |
807 | size_t len, used; | |
808 | char *p; | |
809 | ||
51971139 | 810 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 811 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 812 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 813 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 814 | transport->tcp_offset += used; |
a246b010 CL |
815 | if (used != len) |
816 | return; | |
e136d092 CL |
817 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
818 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
51971139 | 819 | transport->tcp_copied = 4; |
46121cf7 | 820 | dprintk("RPC: reading reply for XID %08x\n", |
51971139 CL |
821 | ntohl(transport->tcp_xid)); |
822 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
823 | } |
824 | ||
dd456471 | 825 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 826 | { |
51971139 | 827 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
828 | struct rpc_rqst *req; |
829 | struct xdr_buf *rcvbuf; | |
830 | size_t len; | |
831 | ssize_t r; | |
832 | ||
833 | /* Find and lock the request corresponding to this xid */ | |
4a0f8c04 | 834 | spin_lock(&xprt->transport_lock); |
51971139 | 835 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
a246b010 | 836 | if (!req) { |
e136d092 | 837 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 838 | dprintk("RPC: XID %08x request not found!\n", |
51971139 | 839 | ntohl(transport->tcp_xid)); |
4a0f8c04 | 840 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
841 | return; |
842 | } | |
843 | ||
844 | rcvbuf = &req->rq_private_buf; | |
845 | len = desc->count; | |
51971139 | 846 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 847 | struct xdr_skb_reader my_desc; |
a246b010 | 848 | |
51971139 | 849 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
850 | memcpy(&my_desc, desc, sizeof(my_desc)); |
851 | my_desc.count = len; | |
51971139 | 852 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 853 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
854 | desc->count -= r; |
855 | desc->offset += r; | |
856 | } else | |
51971139 | 857 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 858 | desc, xdr_skb_read_bits); |
a246b010 CL |
859 | |
860 | if (r > 0) { | |
51971139 CL |
861 | transport->tcp_copied += r; |
862 | transport->tcp_offset += r; | |
a246b010 CL |
863 | } |
864 | if (r != len) { | |
865 | /* Error when copying to the receive buffer, | |
866 | * usually because we weren't able to allocate | |
867 | * additional buffer pages. All we can do now | |
e136d092 | 868 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
869 | * will not receive any additional updates, |
870 | * and time out. | |
871 | * Any remaining data from this record will | |
872 | * be discarded. | |
873 | */ | |
e136d092 | 874 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 875 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 876 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
877 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
878 | "tcp_offset = %u, tcp_reclen = %u\n", | |
879 | xprt, transport->tcp_copied, | |
880 | transport->tcp_offset, transport->tcp_reclen); | |
a246b010 CL |
881 | goto out; |
882 | } | |
883 | ||
46121cf7 | 884 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 885 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
886 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
887 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
888 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
889 | |
890 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 891 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 892 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
893 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
894 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
895 | } |
896 | ||
897 | out: | |
e136d092 | 898 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 899 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
4a0f8c04 | 900 | spin_unlock(&xprt->transport_lock); |
51971139 | 901 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
902 | } |
903 | ||
dd456471 | 904 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
905 | { |
906 | size_t len; | |
907 | ||
51971139 | 908 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
909 | if (len > desc->count) |
910 | len = desc->count; | |
911 | desc->count -= len; | |
912 | desc->offset += len; | |
51971139 | 913 | transport->tcp_offset += len; |
46121cf7 | 914 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 915 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
916 | } |
917 | ||
9903cd1c | 918 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
919 | { |
920 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 921 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 922 | struct xdr_skb_reader desc = { |
a246b010 CL |
923 | .skb = skb, |
924 | .offset = offset, | |
925 | .count = len, | |
9903cd1c | 926 | }; |
a246b010 | 927 | |
46121cf7 | 928 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
929 | do { |
930 | /* Read in a new fragment marker if necessary */ | |
931 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 932 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 933 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
934 | continue; |
935 | } | |
936 | /* Read in the xid if necessary */ | |
e136d092 | 937 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 938 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
939 | continue; |
940 | } | |
941 | /* Read in the request data */ | |
e136d092 | 942 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
9903cd1c | 943 | xs_tcp_read_request(xprt, &desc); |
a246b010 CL |
944 | continue; |
945 | } | |
946 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 947 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 948 | } while (desc.count); |
46121cf7 | 949 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
950 | return len - desc.count; |
951 | } | |
952 | ||
9903cd1c CL |
953 | /** |
954 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
955 | * @sk: socket with data to read | |
956 | * @bytes: how much data to read | |
957 | * | |
958 | */ | |
959 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
960 | { |
961 | struct rpc_xprt *xprt; | |
962 | read_descriptor_t rd_desc; | |
963 | ||
46121cf7 CL |
964 | dprintk("RPC: xs_tcp_data_ready...\n"); |
965 | ||
a246b010 | 966 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 967 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 968 | goto out; |
a246b010 CL |
969 | if (xprt->shutdown) |
970 | goto out; | |
971 | ||
9903cd1c | 972 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 CL |
973 | rd_desc.arg.data = xprt; |
974 | rd_desc.count = 65536; | |
9903cd1c | 975 | tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
a246b010 CL |
976 | out: |
977 | read_unlock(&sk->sk_callback_lock); | |
978 | } | |
979 | ||
9903cd1c CL |
980 | /** |
981 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
982 | * @sk: socket whose state has changed | |
983 | * | |
984 | */ | |
985 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 986 | { |
9903cd1c | 987 | struct rpc_xprt *xprt; |
a246b010 CL |
988 | |
989 | read_lock(&sk->sk_callback_lock); | |
990 | if (!(xprt = xprt_from_sock(sk))) | |
991 | goto out; | |
46121cf7 CL |
992 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
993 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
994 | sk->sk_state, xprt_connected(xprt), | |
995 | sock_flag(sk, SOCK_DEAD), | |
996 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
997 | |
998 | switch (sk->sk_state) { | |
999 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1000 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1001 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1002 | struct sock_xprt *transport = container_of(xprt, |
1003 | struct sock_xprt, xprt); | |
1004 | ||
a246b010 | 1005 | /* Reset TCP record info */ |
51971139 CL |
1006 | transport->tcp_offset = 0; |
1007 | transport->tcp_reclen = 0; | |
1008 | transport->tcp_copied = 0; | |
e136d092 CL |
1009 | transport->tcp_flags = |
1010 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1011 | |
03bf4b70 | 1012 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
44fbac22 | 1013 | xprt_wake_pending_tasks(xprt, 0); |
a246b010 | 1014 | } |
4a0f8c04 | 1015 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 CL |
1016 | break; |
1017 | case TCP_SYN_SENT: | |
1018 | case TCP_SYN_RECV: | |
1019 | break; | |
632e3bdc TM |
1020 | case TCP_CLOSE_WAIT: |
1021 | /* Try to schedule an autoclose RPC calls */ | |
1022 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1023 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
c1384c9c | 1024 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
a246b010 CL |
1025 | default: |
1026 | xprt_disconnect(xprt); | |
a246b010 CL |
1027 | } |
1028 | out: | |
1029 | read_unlock(&sk->sk_callback_lock); | |
1030 | } | |
1031 | ||
9903cd1c | 1032 | /** |
c7b2cae8 CL |
1033 | * xs_udp_write_space - callback invoked when socket buffer space |
1034 | * becomes available | |
9903cd1c CL |
1035 | * @sk: socket whose state has changed |
1036 | * | |
a246b010 CL |
1037 | * Called when more output buffer space is available for this socket. |
1038 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1039 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1040 | * with a bunch of small requests. |
1041 | */ | |
c7b2cae8 | 1042 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1043 | { |
a246b010 | 1044 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1045 | |
c7b2cae8 CL |
1046 | /* from net/core/sock.c:sock_def_write_space */ |
1047 | if (sock_writeable(sk)) { | |
1048 | struct socket *sock; | |
1049 | struct rpc_xprt *xprt; | |
1050 | ||
1051 | if (unlikely(!(sock = sk->sk_socket))) | |
a246b010 | 1052 | goto out; |
c7b2cae8 CL |
1053 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1054 | goto out; | |
1055 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
a246b010 | 1056 | goto out; |
c7b2cae8 CL |
1057 | |
1058 | xprt_write_space(xprt); | |
a246b010 CL |
1059 | } |
1060 | ||
c7b2cae8 CL |
1061 | out: |
1062 | read_unlock(&sk->sk_callback_lock); | |
1063 | } | |
a246b010 | 1064 | |
c7b2cae8 CL |
1065 | /** |
1066 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1067 | * becomes available | |
1068 | * @sk: socket whose state has changed | |
1069 | * | |
1070 | * Called when more output buffer space is available for this socket. | |
1071 | * We try not to wake our writers until they can make "significant" | |
1072 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1073 | * with a bunch of small requests. | |
1074 | */ | |
1075 | static void xs_tcp_write_space(struct sock *sk) | |
1076 | { | |
1077 | read_lock(&sk->sk_callback_lock); | |
1078 | ||
1079 | /* from net/core/stream.c:sk_stream_write_space */ | |
1080 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
1081 | struct socket *sock; | |
1082 | struct rpc_xprt *xprt; | |
1083 | ||
1084 | if (unlikely(!(sock = sk->sk_socket))) | |
1085 | goto out; | |
1086 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1087 | goto out; | |
1088 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
1089 | goto out; | |
1090 | ||
1091 | xprt_write_space(xprt); | |
1092 | } | |
1093 | ||
1094 | out: | |
a246b010 CL |
1095 | read_unlock(&sk->sk_callback_lock); |
1096 | } | |
1097 | ||
470056c2 | 1098 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1099 | { |
ee0ac0c2 CL |
1100 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1101 | struct sock *sk = transport->inet; | |
a246b010 | 1102 | |
7c6e066e | 1103 | if (transport->rcvsize) { |
a246b010 | 1104 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1105 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1106 | } |
7c6e066e | 1107 | if (transport->sndsize) { |
a246b010 | 1108 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1109 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1110 | sk->sk_write_space(sk); |
1111 | } | |
1112 | } | |
1113 | ||
43118c29 | 1114 | /** |
470056c2 | 1115 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1116 | * @xprt: generic transport |
470056c2 CL |
1117 | * @sndsize: requested size of send buffer, in bytes |
1118 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1119 | * |
470056c2 | 1120 | * Set socket send and receive buffer size limits. |
43118c29 | 1121 | */ |
470056c2 | 1122 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1123 | { |
7c6e066e CL |
1124 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1125 | ||
1126 | transport->sndsize = 0; | |
470056c2 | 1127 | if (sndsize) |
7c6e066e CL |
1128 | transport->sndsize = sndsize + 1024; |
1129 | transport->rcvsize = 0; | |
470056c2 | 1130 | if (rcvsize) |
7c6e066e | 1131 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1132 | |
1133 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1134 | } |
1135 | ||
46c0ee8b CL |
1136 | /** |
1137 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1138 | * @task: task that timed out | |
1139 | * | |
1140 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1141 | */ | |
1142 | static void xs_udp_timer(struct rpc_task *task) | |
1143 | { | |
1144 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1145 | } | |
1146 | ||
b85d8806 CL |
1147 | static unsigned short xs_get_random_port(void) |
1148 | { | |
1149 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1150 | unsigned short rand = (unsigned short) net_random() % range; | |
1151 | return rand + xprt_min_resvport; | |
1152 | } | |
1153 | ||
92200412 CL |
1154 | /** |
1155 | * xs_set_port - reset the port number in the remote endpoint address | |
1156 | * @xprt: generic transport | |
1157 | * @port: new port number | |
1158 | * | |
1159 | */ | |
1160 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1161 | { | |
c4efcb1d CL |
1162 | struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr; |
1163 | ||
46121cf7 | 1164 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d CL |
1165 | |
1166 | sap->sin_port = htons(port); | |
92200412 CL |
1167 | } |
1168 | ||
d3bc9a1d | 1169 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1170 | { |
1171 | struct sockaddr_in myaddr = { | |
1172 | .sin_family = AF_INET, | |
1173 | }; | |
d3bc9a1d | 1174 | struct sockaddr_in *sa; |
529b33c6 | 1175 | int err; |
c8475461 | 1176 | unsigned short port = transport->port; |
a246b010 | 1177 | |
d3bc9a1d FM |
1178 | if (!transport->xprt.resvport) |
1179 | port = 0; | |
1180 | sa = (struct sockaddr_in *)&transport->addr; | |
1181 | myaddr.sin_addr = sa->sin_addr; | |
a246b010 CL |
1182 | do { |
1183 | myaddr.sin_port = htons(port); | |
e6242e92 | 1184 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1185 | sizeof(myaddr)); |
d3bc9a1d FM |
1186 | if (!transport->xprt.resvport) |
1187 | break; | |
a246b010 | 1188 | if (err == 0) { |
c8475461 | 1189 | transport->port = port; |
d3bc9a1d | 1190 | break; |
a246b010 | 1191 | } |
529b33c6 CL |
1192 | if (port <= xprt_min_resvport) |
1193 | port = xprt_max_resvport; | |
1194 | else | |
1195 | port--; | |
c8475461 | 1196 | } while (err == -EADDRINUSE && port != transport->port); |
d3bc9a1d FM |
1197 | dprintk("RPC: xs_bind "NIPQUAD_FMT":%u: %s (%d)\n", |
1198 | NIPQUAD(myaddr.sin_addr), port, err ? "failed" : "ok", err); | |
a246b010 CL |
1199 | return err; |
1200 | } | |
1201 | ||
ed07536e PZ |
1202 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1203 | static struct lock_class_key xs_key[2]; | |
1204 | static struct lock_class_key xs_slock_key[2]; | |
1205 | ||
1206 | static inline void xs_reclassify_socket(struct socket *sock) | |
1207 | { | |
1208 | struct sock *sk = sock->sk; | |
1209 | BUG_ON(sk->sk_lock.owner != NULL); | |
1210 | switch (sk->sk_family) { | |
1211 | case AF_INET: | |
1212 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS", | |
1213 | &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]); | |
1214 | break; | |
1215 | ||
1216 | case AF_INET6: | |
1217 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS", | |
1218 | &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]); | |
1219 | break; | |
1220 | ||
1221 | default: | |
1222 | BUG(); | |
1223 | } | |
1224 | } | |
1225 | #else | |
1226 | static inline void xs_reclassify_socket(struct socket *sock) | |
1227 | { | |
1228 | } | |
1229 | #endif | |
1230 | ||
b0d93ad5 CL |
1231 | /** |
1232 | * xs_udp_connect_worker - set up a UDP socket | |
65f27f38 | 1233 | * @work: RPC transport to connect |
b0d93ad5 CL |
1234 | * |
1235 | * Invoked by a work queue tasklet. | |
1236 | */ | |
65f27f38 | 1237 | static void xs_udp_connect_worker(struct work_struct *work) |
a246b010 | 1238 | { |
34161db6 TM |
1239 | struct sock_xprt *transport = |
1240 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1241 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1242 | struct socket *sock = transport->sock; |
b0d93ad5 | 1243 | int err, status = -EIO; |
9903cd1c | 1244 | |
ec739ef0 | 1245 | if (xprt->shutdown || !xprt_bound(xprt)) |
b0d93ad5 | 1246 | goto out; |
9903cd1c | 1247 | |
b0d93ad5 CL |
1248 | /* Start by resetting any existing state */ |
1249 | xs_close(xprt); | |
9903cd1c | 1250 | |
b0d93ad5 | 1251 | if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { |
46121cf7 | 1252 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1253 | goto out; |
1254 | } | |
ed07536e | 1255 | xs_reclassify_socket(sock); |
9903cd1c | 1256 | |
d3bc9a1d | 1257 | if (xs_bind(transport, sock)) { |
b0d93ad5 CL |
1258 | sock_release(sock); |
1259 | goto out; | |
1260 | } | |
9903cd1c | 1261 | |
46121cf7 | 1262 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1263 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1264 | |
ee0ac0c2 | 1265 | if (!transport->inet) { |
b0d93ad5 | 1266 | struct sock *sk = sock->sk; |
a246b010 | 1267 | |
b0d93ad5 | 1268 | write_lock_bh(&sk->sk_callback_lock); |
a246b010 | 1269 | |
b0d93ad5 | 1270 | sk->sk_user_data = xprt; |
314dfd79 CL |
1271 | transport->old_data_ready = sk->sk_data_ready; |
1272 | transport->old_state_change = sk->sk_state_change; | |
1273 | transport->old_write_space = sk->sk_write_space; | |
9903cd1c | 1274 | sk->sk_data_ready = xs_udp_data_ready; |
c7b2cae8 | 1275 | sk->sk_write_space = xs_udp_write_space; |
a246b010 | 1276 | sk->sk_no_check = UDP_CSUM_NORCV; |
b079fa7b | 1277 | sk->sk_allocation = GFP_ATOMIC; |
b0d93ad5 | 1278 | |
a246b010 | 1279 | xprt_set_connected(xprt); |
a246b010 | 1280 | |
b0d93ad5 | 1281 | /* Reset to new socket */ |
ee0ac0c2 CL |
1282 | transport->sock = sock; |
1283 | transport->inet = sk; | |
a246b010 | 1284 | |
b0d93ad5 CL |
1285 | write_unlock_bh(&sk->sk_callback_lock); |
1286 | } | |
470056c2 | 1287 | xs_udp_do_set_buffer_size(xprt); |
b0d93ad5 CL |
1288 | status = 0; |
1289 | out: | |
1290 | xprt_wake_pending_tasks(xprt, status); | |
1291 | xprt_clear_connecting(xprt); | |
a246b010 CL |
1292 | } |
1293 | ||
3167e12c CL |
1294 | /* |
1295 | * We need to preserve the port number so the reply cache on the server can | |
1296 | * find our cached RPC replies when we get around to reconnecting. | |
1297 | */ | |
1298 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) | |
1299 | { | |
1300 | int result; | |
ee0ac0c2 | 1301 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
3167e12c CL |
1302 | struct sockaddr any; |
1303 | ||
46121cf7 | 1304 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1305 | |
1306 | /* | |
1307 | * Disconnect the transport socket by doing a connect operation | |
1308 | * with AF_UNSPEC. This should return immediately... | |
1309 | */ | |
1310 | memset(&any, 0, sizeof(any)); | |
1311 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1312 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
3167e12c | 1313 | if (result) |
46121cf7 | 1314 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1315 | result); |
1316 | } | |
1317 | ||
9903cd1c | 1318 | /** |
b0d93ad5 | 1319 | * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint |
65f27f38 | 1320 | * @work: RPC transport to connect |
9903cd1c CL |
1321 | * |
1322 | * Invoked by a work queue tasklet. | |
a246b010 | 1323 | */ |
65f27f38 | 1324 | static void xs_tcp_connect_worker(struct work_struct *work) |
a246b010 | 1325 | { |
34161db6 TM |
1326 | struct sock_xprt *transport = |
1327 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1328 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1329 | struct socket *sock = transport->sock; |
b0d93ad5 | 1330 | int err, status = -EIO; |
a246b010 | 1331 | |
ec739ef0 | 1332 | if (xprt->shutdown || !xprt_bound(xprt)) |
a246b010 CL |
1333 | goto out; |
1334 | ||
ee0ac0c2 | 1335 | if (!sock) { |
3167e12c CL |
1336 | /* start from scratch */ |
1337 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
46121cf7 CL |
1338 | dprintk("RPC: can't create TCP transport " |
1339 | "socket (%d).\n", -err); | |
3167e12c CL |
1340 | goto out; |
1341 | } | |
ed07536e | 1342 | xs_reclassify_socket(sock); |
a246b010 | 1343 | |
d3bc9a1d | 1344 | if (xs_bind(transport, sock)) { |
3167e12c CL |
1345 | sock_release(sock); |
1346 | goto out; | |
1347 | } | |
1348 | } else | |
1349 | /* "close" the socket, preserving the local port */ | |
1350 | xs_tcp_reuse_connection(xprt); | |
a246b010 | 1351 | |
46121cf7 | 1352 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1353 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1354 | |
ee0ac0c2 | 1355 | if (!transport->inet) { |
b0d93ad5 CL |
1356 | struct sock *sk = sock->sk; |
1357 | ||
1358 | write_lock_bh(&sk->sk_callback_lock); | |
1359 | ||
1360 | sk->sk_user_data = xprt; | |
314dfd79 CL |
1361 | transport->old_data_ready = sk->sk_data_ready; |
1362 | transport->old_state_change = sk->sk_state_change; | |
1363 | transport->old_write_space = sk->sk_write_space; | |
b0d93ad5 CL |
1364 | sk->sk_data_ready = xs_tcp_data_ready; |
1365 | sk->sk_state_change = xs_tcp_state_change; | |
1366 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 1367 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1368 | |
1369 | /* socket options */ | |
1370 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1371 | sock_reset_flag(sk, SOCK_LINGER); | |
1372 | tcp_sk(sk)->linger2 = 0; | |
1373 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1374 | |
1375 | xprt_clear_connected(xprt); | |
1376 | ||
1377 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1378 | transport->sock = sock; |
1379 | transport->inet = sk; | |
b0d93ad5 CL |
1380 | |
1381 | write_unlock_bh(&sk->sk_callback_lock); | |
1382 | } | |
1383 | ||
1384 | /* Tell the socket layer to start connecting... */ | |
262ca07d CL |
1385 | xprt->stat.connect_count++; |
1386 | xprt->stat.connect_start = jiffies; | |
e6242e92 | 1387 | status = kernel_connect(sock, (struct sockaddr *) &xprt->addr, |
c4efcb1d | 1388 | xprt->addrlen, O_NONBLOCK); |
46121cf7 CL |
1389 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1390 | xprt, -status, xprt_connected(xprt), | |
1391 | sock->sk->sk_state); | |
a246b010 CL |
1392 | if (status < 0) { |
1393 | switch (status) { | |
1394 | case -EINPROGRESS: | |
1395 | case -EALREADY: | |
1396 | goto out_clear; | |
3167e12c CL |
1397 | case -ECONNREFUSED: |
1398 | case -ECONNRESET: | |
1399 | /* retry with existing socket, after a delay */ | |
1400 | break; | |
1401 | default: | |
1402 | /* get rid of existing socket, and retry */ | |
1403 | xs_close(xprt); | |
1404 | break; | |
a246b010 CL |
1405 | } |
1406 | } | |
1407 | out: | |
44fbac22 | 1408 | xprt_wake_pending_tasks(xprt, status); |
a246b010 | 1409 | out_clear: |
2226feb6 | 1410 | xprt_clear_connecting(xprt); |
a246b010 CL |
1411 | } |
1412 | ||
9903cd1c CL |
1413 | /** |
1414 | * xs_connect - connect a socket to a remote endpoint | |
1415 | * @task: address of RPC task that manages state of connect request | |
1416 | * | |
1417 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
1418 | * |
1419 | * UDP socket connects are synchronous, but we use a work queue anyway | |
1420 | * to guarantee that even unprivileged user processes can set up a | |
1421 | * socket on a privileged port. | |
1422 | * | |
1423 | * If a UDP socket connect fails, the delay behavior here prevents | |
1424 | * retry floods (hard mounts). | |
9903cd1c CL |
1425 | */ |
1426 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
1427 | { |
1428 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 1429 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1430 | |
b0d93ad5 CL |
1431 | if (xprt_test_and_set_connecting(xprt)) |
1432 | return; | |
1433 | ||
ee0ac0c2 | 1434 | if (transport->sock != NULL) { |
46121cf7 CL |
1435 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
1436 | "seconds\n", | |
03bf4b70 | 1437 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
1438 | queue_delayed_work(rpciod_workqueue, |
1439 | &transport->connect_worker, | |
1440 | xprt->reestablish_timeout); | |
03bf4b70 CL |
1441 | xprt->reestablish_timeout <<= 1; |
1442 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
1443 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 1444 | } else { |
46121cf7 | 1445 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
1446 | queue_delayed_work(rpciod_workqueue, |
1447 | &transport->connect_worker, 0); | |
a246b010 CL |
1448 | } |
1449 | } | |
1450 | ||
262ca07d CL |
1451 | /** |
1452 | * xs_udp_print_stats - display UDP socket-specifc stats | |
1453 | * @xprt: rpc_xprt struct containing statistics | |
1454 | * @seq: output file | |
1455 | * | |
1456 | */ | |
1457 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1458 | { | |
c8475461 CL |
1459 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1460 | ||
262ca07d | 1461 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
c8475461 | 1462 | transport->port, |
262ca07d CL |
1463 | xprt->stat.bind_count, |
1464 | xprt->stat.sends, | |
1465 | xprt->stat.recvs, | |
1466 | xprt->stat.bad_xids, | |
1467 | xprt->stat.req_u, | |
1468 | xprt->stat.bklog_u); | |
1469 | } | |
1470 | ||
1471 | /** | |
1472 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
1473 | * @xprt: rpc_xprt struct containing statistics | |
1474 | * @seq: output file | |
1475 | * | |
1476 | */ | |
1477 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1478 | { | |
c8475461 | 1479 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
1480 | long idle_time = 0; |
1481 | ||
1482 | if (xprt_connected(xprt)) | |
1483 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
1484 | ||
1485 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
c8475461 | 1486 | transport->port, |
262ca07d CL |
1487 | xprt->stat.bind_count, |
1488 | xprt->stat.connect_count, | |
1489 | xprt->stat.connect_time, | |
1490 | idle_time, | |
1491 | xprt->stat.sends, | |
1492 | xprt->stat.recvs, | |
1493 | xprt->stat.bad_xids, | |
1494 | xprt->stat.req_u, | |
1495 | xprt->stat.bklog_u); | |
1496 | } | |
1497 | ||
262965f5 | 1498 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 1499 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 1500 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 1501 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 1502 | .rpcbind = rpcb_getport_async, |
92200412 | 1503 | .set_port = xs_set_port, |
262965f5 | 1504 | .connect = xs_connect, |
02107148 CL |
1505 | .buf_alloc = rpc_malloc, |
1506 | .buf_free = rpc_free, | |
262965f5 | 1507 | .send_request = xs_udp_send_request, |
fe3aca29 | 1508 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 1509 | .timer = xs_udp_timer, |
a58dd398 | 1510 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
1511 | .close = xs_close, |
1512 | .destroy = xs_destroy, | |
262ca07d | 1513 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
1514 | }; |
1515 | ||
1516 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 1517 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 1518 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 1519 | .rpcbind = rpcb_getport_async, |
92200412 | 1520 | .set_port = xs_set_port, |
9903cd1c | 1521 | .connect = xs_connect, |
02107148 CL |
1522 | .buf_alloc = rpc_malloc, |
1523 | .buf_free = rpc_free, | |
262965f5 | 1524 | .send_request = xs_tcp_send_request, |
fe3aca29 | 1525 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
9903cd1c CL |
1526 | .close = xs_close, |
1527 | .destroy = xs_destroy, | |
262ca07d | 1528 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
1529 | }; |
1530 | ||
96802a09 | 1531 | static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size) |
c8541ecd CL |
1532 | { |
1533 | struct rpc_xprt *xprt; | |
ffc2e518 | 1534 | struct sock_xprt *new; |
c8541ecd | 1535 | |
96802a09 | 1536 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 1537 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
1538 | return ERR_PTR(-EBADF); |
1539 | } | |
1540 | ||
ffc2e518 CL |
1541 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1542 | if (new == NULL) { | |
46121cf7 CL |
1543 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
1544 | "rpc_xprt\n"); | |
c8541ecd CL |
1545 | return ERR_PTR(-ENOMEM); |
1546 | } | |
ffc2e518 | 1547 | xprt = &new->xprt; |
c8541ecd CL |
1548 | |
1549 | xprt->max_reqs = slot_table_size; | |
1550 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
1551 | if (xprt->slot == NULL) { | |
1552 | kfree(xprt); | |
46121cf7 CL |
1553 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
1554 | "table\n"); | |
c8541ecd CL |
1555 | return ERR_PTR(-ENOMEM); |
1556 | } | |
1557 | ||
96802a09 FM |
1558 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
1559 | xprt->addrlen = args->addrlen; | |
d3bc9a1d FM |
1560 | if (args->srcaddr) |
1561 | memcpy(&new->addr, args->srcaddr, args->addrlen); | |
c8475461 | 1562 | new->port = xs_get_random_port(); |
c8541ecd CL |
1563 | |
1564 | return xprt; | |
1565 | } | |
1566 | ||
9903cd1c CL |
1567 | /** |
1568 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 1569 | * @args: rpc transport creation arguments |
9903cd1c CL |
1570 | * |
1571 | */ | |
96802a09 | 1572 | struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args) |
a246b010 | 1573 | { |
c8541ecd | 1574 | struct rpc_xprt *xprt; |
c8475461 | 1575 | struct sock_xprt *transport; |
a246b010 | 1576 | |
96802a09 | 1577 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
1578 | if (IS_ERR(xprt)) |
1579 | return xprt; | |
c8475461 | 1580 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1581 | |
96802a09 | 1582 | if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0) |
ec739ef0 | 1583 | xprt_set_bound(xprt); |
ec739ef0 CL |
1584 | |
1585 | xprt->prot = IPPROTO_UDP; | |
808012fb | 1586 | xprt->tsh_size = 0; |
a246b010 CL |
1587 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
1588 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
1589 | ||
34161db6 | 1590 | INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker); |
03bf4b70 CL |
1591 | xprt->bind_timeout = XS_BIND_TO; |
1592 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
1593 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
1594 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1595 | |
262965f5 | 1596 | xprt->ops = &xs_udp_ops; |
a246b010 | 1597 | |
96802a09 FM |
1598 | if (args->timeout) |
1599 | xprt->timeout = *args->timeout; | |
a246b010 | 1600 | else |
9903cd1c | 1601 | xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); |
a246b010 | 1602 | |
edb267a6 | 1603 | xs_format_peer_addresses(xprt); |
46121cf7 | 1604 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 1605 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1606 | |
c8541ecd | 1607 | return xprt; |
a246b010 CL |
1608 | } |
1609 | ||
9903cd1c CL |
1610 | /** |
1611 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 1612 | * @args: rpc transport creation arguments |
9903cd1c CL |
1613 | * |
1614 | */ | |
96802a09 | 1615 | struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args) |
a246b010 | 1616 | { |
c8541ecd | 1617 | struct rpc_xprt *xprt; |
c8475461 | 1618 | struct sock_xprt *transport; |
a246b010 | 1619 | |
96802a09 | 1620 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
1621 | if (IS_ERR(xprt)) |
1622 | return xprt; | |
c8475461 | 1623 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1624 | |
96802a09 | 1625 | if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0) |
ec739ef0 | 1626 | xprt_set_bound(xprt); |
ec739ef0 CL |
1627 | |
1628 | xprt->prot = IPPROTO_TCP; | |
808012fb | 1629 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 1630 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 1631 | |
34161db6 | 1632 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker); |
03bf4b70 CL |
1633 | xprt->bind_timeout = XS_BIND_TO; |
1634 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
1635 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
1636 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1637 | |
262965f5 | 1638 | xprt->ops = &xs_tcp_ops; |
a246b010 | 1639 | |
96802a09 FM |
1640 | if (args->timeout) |
1641 | xprt->timeout = *args->timeout; | |
a246b010 | 1642 | else |
9903cd1c | 1643 | xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); |
a246b010 | 1644 | |
edb267a6 | 1645 | xs_format_peer_addresses(xprt); |
46121cf7 | 1646 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 1647 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1648 | |
c8541ecd | 1649 | return xprt; |
a246b010 | 1650 | } |
282b32e1 CL |
1651 | |
1652 | /** | |
fbf76683 | 1653 | * init_socket_xprt - set up xprtsock's sysctls |
282b32e1 CL |
1654 | * |
1655 | */ | |
1656 | int init_socket_xprt(void) | |
1657 | { | |
fbf76683 | 1658 | #ifdef RPC_DEBUG |
2b1bec5f | 1659 | if (!sunrpc_table_header) |
0b4d4147 | 1660 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
1661 | #endif |
1662 | ||
282b32e1 CL |
1663 | return 0; |
1664 | } | |
1665 | ||
1666 | /** | |
fbf76683 | 1667 | * cleanup_socket_xprt - remove xprtsock's sysctls |
282b32e1 CL |
1668 | * |
1669 | */ | |
1670 | void cleanup_socket_xprt(void) | |
1671 | { | |
fbf76683 CL |
1672 | #ifdef RPC_DEBUG |
1673 | if (sunrpc_table_header) { | |
1674 | unregister_sysctl_table(sunrpc_table_header); | |
1675 | sunrpc_table_header = NULL; | |
1676 | } | |
1677 | #endif | |
282b32e1 | 1678 | } |