David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1 | /* RxRPC individual remote procedure call handling |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/circ_buf.h> |
| 15 | #include <net/sock.h> |
| 16 | #include <net/af_rxrpc.h> |
| 17 | #include "ar-internal.h" |
| 18 | |
Jan Engelhardt | 036c2e2 | 2008-01-30 18:55:45 -0800 | [diff] [blame] | 19 | const char *const rxrpc_call_states[] = { |
David Howells | 1f8481d | 2007-05-22 16:14:24 -0700 | [diff] [blame] | 20 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
| 21 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", |
| 22 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", |
| 23 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", |
| 24 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", |
| 25 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", |
| 26 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", |
| 27 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", |
| 28 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", |
| 29 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", |
| 30 | [RXRPC_CALL_COMPLETE] = "Complete", |
| 31 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", |
| 32 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", |
| 33 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", |
| 34 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
| 35 | [RXRPC_CALL_DEAD] = "Dead ", |
| 36 | }; |
| 37 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 38 | struct kmem_cache *rxrpc_call_jar; |
| 39 | LIST_HEAD(rxrpc_calls); |
| 40 | DEFINE_RWLOCK(rxrpc_call_lock); |
| 41 | static unsigned rxrpc_call_max_lifetime = 60; |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 42 | static unsigned rxrpc_dead_call_timeout = 2; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 43 | |
| 44 | static void rxrpc_destroy_call(struct work_struct *work); |
| 45 | static void rxrpc_call_life_expired(unsigned long _call); |
| 46 | static void rxrpc_dead_call_expired(unsigned long _call); |
| 47 | static void rxrpc_ack_time_expired(unsigned long _call); |
| 48 | static void rxrpc_resend_time_expired(unsigned long _call); |
| 49 | |
| 50 | /* |
| 51 | * allocate a new call |
| 52 | */ |
| 53 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) |
| 54 | { |
| 55 | struct rxrpc_call *call; |
| 56 | |
| 57 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); |
| 58 | if (!call) |
| 59 | return NULL; |
| 60 | |
| 61 | call->acks_winsz = 16; |
| 62 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), |
| 63 | gfp); |
| 64 | if (!call->acks_window) { |
| 65 | kmem_cache_free(rxrpc_call_jar, call); |
| 66 | return NULL; |
| 67 | } |
| 68 | |
| 69 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, |
| 70 | (unsigned long) call); |
| 71 | setup_timer(&call->deadspan, &rxrpc_dead_call_expired, |
| 72 | (unsigned long) call); |
| 73 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, |
| 74 | (unsigned long) call); |
| 75 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, |
| 76 | (unsigned long) call); |
| 77 | INIT_WORK(&call->destroyer, &rxrpc_destroy_call); |
| 78 | INIT_WORK(&call->processor, &rxrpc_process_call); |
| 79 | INIT_LIST_HEAD(&call->accept_link); |
| 80 | skb_queue_head_init(&call->rx_queue); |
| 81 | skb_queue_head_init(&call->rx_oos_queue); |
| 82 | init_waitqueue_head(&call->tx_waitq); |
| 83 | spin_lock_init(&call->lock); |
| 84 | rwlock_init(&call->state_lock); |
| 85 | atomic_set(&call->usage, 1); |
| 86 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); |
| 87 | call->state = RXRPC_CALL_CLIENT_SEND_REQUEST; |
| 88 | |
| 89 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); |
| 90 | |
| 91 | call->rx_data_expect = 1; |
| 92 | call->rx_data_eaten = 0; |
| 93 | call->rx_first_oos = 0; |
| 94 | call->ackr_win_top = call->rx_data_eaten + 1 + RXRPC_MAXACKS; |
| 95 | call->creation_jif = jiffies; |
| 96 | return call; |
| 97 | } |
| 98 | |
| 99 | /* |
Anand Gadiyar | fd589a8 | 2009-07-16 17:13:03 +0200 | [diff] [blame] | 100 | * allocate a new client call and attempt to get a connection slot for it |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 101 | */ |
| 102 | static struct rxrpc_call *rxrpc_alloc_client_call( |
| 103 | struct rxrpc_sock *rx, |
| 104 | struct rxrpc_transport *trans, |
| 105 | struct rxrpc_conn_bundle *bundle, |
| 106 | gfp_t gfp) |
| 107 | { |
| 108 | struct rxrpc_call *call; |
| 109 | int ret; |
| 110 | |
| 111 | _enter(""); |
| 112 | |
| 113 | ASSERT(rx != NULL); |
| 114 | ASSERT(trans != NULL); |
| 115 | ASSERT(bundle != NULL); |
| 116 | |
| 117 | call = rxrpc_alloc_call(gfp); |
| 118 | if (!call) |
| 119 | return ERR_PTR(-ENOMEM); |
| 120 | |
| 121 | sock_hold(&rx->sk); |
| 122 | call->socket = rx; |
| 123 | call->rx_data_post = 1; |
| 124 | |
| 125 | ret = rxrpc_connect_call(rx, trans, bundle, call, gfp); |
| 126 | if (ret < 0) { |
| 127 | kmem_cache_free(rxrpc_call_jar, call); |
| 128 | return ERR_PTR(ret); |
| 129 | } |
| 130 | |
| 131 | spin_lock(&call->conn->trans->peer->lock); |
| 132 | list_add(&call->error_link, &call->conn->trans->peer->error_targets); |
| 133 | spin_unlock(&call->conn->trans->peer->lock); |
| 134 | |
| 135 | call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ; |
| 136 | add_timer(&call->lifetimer); |
| 137 | |
| 138 | _leave(" = %p", call); |
| 139 | return call; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * set up a call for the given data |
| 144 | * - called in process context with IRQs enabled |
| 145 | */ |
| 146 | struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx, |
| 147 | struct rxrpc_transport *trans, |
| 148 | struct rxrpc_conn_bundle *bundle, |
| 149 | unsigned long user_call_ID, |
| 150 | int create, |
| 151 | gfp_t gfp) |
| 152 | { |
| 153 | struct rxrpc_call *call, *candidate; |
| 154 | struct rb_node *p, *parent, **pp; |
| 155 | |
| 156 | _enter("%p,%d,%d,%lx,%d", |
| 157 | rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1, |
| 158 | user_call_ID, create); |
| 159 | |
| 160 | /* search the extant calls first for one that matches the specified |
| 161 | * user ID */ |
| 162 | read_lock(&rx->call_lock); |
| 163 | |
| 164 | p = rx->calls.rb_node; |
| 165 | while (p) { |
| 166 | call = rb_entry(p, struct rxrpc_call, sock_node); |
| 167 | |
| 168 | if (user_call_ID < call->user_call_ID) |
| 169 | p = p->rb_left; |
| 170 | else if (user_call_ID > call->user_call_ID) |
| 171 | p = p->rb_right; |
| 172 | else |
| 173 | goto found_extant_call; |
| 174 | } |
| 175 | |
| 176 | read_unlock(&rx->call_lock); |
| 177 | |
| 178 | if (!create || !trans) |
| 179 | return ERR_PTR(-EBADSLT); |
| 180 | |
| 181 | /* not yet present - create a candidate for a new record and then |
| 182 | * redo the search */ |
| 183 | candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp); |
| 184 | if (IS_ERR(candidate)) { |
| 185 | _leave(" = %ld", PTR_ERR(candidate)); |
| 186 | return candidate; |
| 187 | } |
| 188 | |
| 189 | candidate->user_call_ID = user_call_ID; |
| 190 | __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags); |
| 191 | |
| 192 | write_lock(&rx->call_lock); |
| 193 | |
| 194 | pp = &rx->calls.rb_node; |
| 195 | parent = NULL; |
| 196 | while (*pp) { |
| 197 | parent = *pp; |
| 198 | call = rb_entry(parent, struct rxrpc_call, sock_node); |
| 199 | |
| 200 | if (user_call_ID < call->user_call_ID) |
| 201 | pp = &(*pp)->rb_left; |
| 202 | else if (user_call_ID > call->user_call_ID) |
| 203 | pp = &(*pp)->rb_right; |
| 204 | else |
| 205 | goto found_extant_second; |
| 206 | } |
| 207 | |
| 208 | /* second search also failed; add the new call */ |
| 209 | call = candidate; |
| 210 | candidate = NULL; |
| 211 | rxrpc_get_call(call); |
| 212 | |
| 213 | rb_link_node(&call->sock_node, parent, pp); |
| 214 | rb_insert_color(&call->sock_node, &rx->calls); |
| 215 | write_unlock(&rx->call_lock); |
| 216 | |
| 217 | write_lock_bh(&rxrpc_call_lock); |
| 218 | list_add_tail(&call->link, &rxrpc_calls); |
| 219 | write_unlock_bh(&rxrpc_call_lock); |
| 220 | |
| 221 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
| 222 | |
| 223 | _leave(" = %p [new]", call); |
| 224 | return call; |
| 225 | |
| 226 | /* we found the call in the list immediately */ |
| 227 | found_extant_call: |
| 228 | rxrpc_get_call(call); |
| 229 | read_unlock(&rx->call_lock); |
| 230 | _leave(" = %p [extant %d]", call, atomic_read(&call->usage)); |
| 231 | return call; |
| 232 | |
| 233 | /* we found the call on the second time through the list */ |
| 234 | found_extant_second: |
| 235 | rxrpc_get_call(call); |
| 236 | write_unlock(&rx->call_lock); |
| 237 | rxrpc_put_call(candidate); |
| 238 | _leave(" = %p [second %d]", call, atomic_read(&call->usage)); |
| 239 | return call; |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * set up an incoming call |
| 244 | * - called in process context with IRQs enabled |
| 245 | */ |
| 246 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, |
| 247 | struct rxrpc_connection *conn, |
| 248 | struct rxrpc_header *hdr, |
| 249 | gfp_t gfp) |
| 250 | { |
| 251 | struct rxrpc_call *call, *candidate; |
| 252 | struct rb_node **p, *parent; |
| 253 | __be32 call_id; |
| 254 | |
| 255 | _enter(",%d,,%x", conn->debug_id, gfp); |
| 256 | |
| 257 | ASSERT(rx != NULL); |
| 258 | |
| 259 | candidate = rxrpc_alloc_call(gfp); |
| 260 | if (!candidate) |
| 261 | return ERR_PTR(-EBUSY); |
| 262 | |
| 263 | candidate->socket = rx; |
| 264 | candidate->conn = conn; |
| 265 | candidate->cid = hdr->cid; |
| 266 | candidate->call_id = hdr->callNumber; |
| 267 | candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK; |
| 268 | candidate->rx_data_post = 0; |
| 269 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; |
| 270 | if (conn->security_ix > 0) |
| 271 | candidate->state = RXRPC_CALL_SERVER_SECURING; |
| 272 | |
| 273 | write_lock_bh(&conn->lock); |
| 274 | |
| 275 | /* set the channel for this call */ |
| 276 | call = conn->channels[candidate->channel]; |
| 277 | _debug("channel[%u] is %p", candidate->channel, call); |
| 278 | if (call && call->call_id == hdr->callNumber) { |
| 279 | /* already set; must've been a duplicate packet */ |
| 280 | _debug("extant call [%d]", call->state); |
| 281 | ASSERTCMP(call->conn, ==, conn); |
| 282 | |
| 283 | read_lock(&call->state_lock); |
| 284 | switch (call->state) { |
| 285 | case RXRPC_CALL_LOCALLY_ABORTED: |
| 286 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 287 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 288 | case RXRPC_CALL_REMOTELY_ABORTED: |
| 289 | read_unlock(&call->state_lock); |
| 290 | goto aborted_call; |
| 291 | default: |
| 292 | rxrpc_get_call(call); |
| 293 | read_unlock(&call->state_lock); |
| 294 | goto extant_call; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | if (call) { |
| 299 | /* it seems the channel is still in use from the previous call |
| 300 | * - ditch the old binding if its call is now complete */ |
| 301 | _debug("CALL: %u { %s }", |
| 302 | call->debug_id, rxrpc_call_states[call->state]); |
| 303 | |
| 304 | if (call->state >= RXRPC_CALL_COMPLETE) { |
| 305 | conn->channels[call->channel] = NULL; |
| 306 | } else { |
| 307 | write_unlock_bh(&conn->lock); |
| 308 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 309 | _leave(" = -EBUSY"); |
| 310 | return ERR_PTR(-EBUSY); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | /* check the call number isn't duplicate */ |
| 315 | _debug("check dup"); |
| 316 | call_id = hdr->callNumber; |
| 317 | p = &conn->calls.rb_node; |
| 318 | parent = NULL; |
| 319 | while (*p) { |
| 320 | parent = *p; |
| 321 | call = rb_entry(parent, struct rxrpc_call, conn_node); |
| 322 | |
| 323 | if (call_id < call->call_id) |
| 324 | p = &(*p)->rb_left; |
| 325 | else if (call_id > call->call_id) |
| 326 | p = &(*p)->rb_right; |
| 327 | else |
| 328 | goto old_call; |
| 329 | } |
| 330 | |
| 331 | /* make the call available */ |
| 332 | _debug("new call"); |
| 333 | call = candidate; |
| 334 | candidate = NULL; |
| 335 | rb_link_node(&call->conn_node, parent, p); |
| 336 | rb_insert_color(&call->conn_node, &conn->calls); |
| 337 | conn->channels[call->channel] = call; |
| 338 | sock_hold(&rx->sk); |
| 339 | atomic_inc(&conn->usage); |
| 340 | write_unlock_bh(&conn->lock); |
| 341 | |
| 342 | spin_lock(&conn->trans->peer->lock); |
| 343 | list_add(&call->error_link, &conn->trans->peer->error_targets); |
| 344 | spin_unlock(&conn->trans->peer->lock); |
| 345 | |
| 346 | write_lock_bh(&rxrpc_call_lock); |
| 347 | list_add_tail(&call->link, &rxrpc_calls); |
| 348 | write_unlock_bh(&rxrpc_call_lock); |
| 349 | |
| 350 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
| 351 | |
| 352 | call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ; |
| 353 | add_timer(&call->lifetimer); |
| 354 | _leave(" = %p {%d} [new]", call, call->debug_id); |
| 355 | return call; |
| 356 | |
| 357 | extant_call: |
| 358 | write_unlock_bh(&conn->lock); |
| 359 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 360 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); |
| 361 | return call; |
| 362 | |
| 363 | aborted_call: |
| 364 | write_unlock_bh(&conn->lock); |
| 365 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 366 | _leave(" = -ECONNABORTED"); |
| 367 | return ERR_PTR(-ECONNABORTED); |
| 368 | |
| 369 | old_call: |
| 370 | write_unlock_bh(&conn->lock); |
| 371 | kmem_cache_free(rxrpc_call_jar, candidate); |
| 372 | _leave(" = -ECONNRESET [old]"); |
| 373 | return ERR_PTR(-ECONNRESET); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * find an extant server call |
| 378 | * - called in process context with IRQs enabled |
| 379 | */ |
| 380 | struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx, |
| 381 | unsigned long user_call_ID) |
| 382 | { |
| 383 | struct rxrpc_call *call; |
| 384 | struct rb_node *p; |
| 385 | |
| 386 | _enter("%p,%lx", rx, user_call_ID); |
| 387 | |
| 388 | /* search the extant calls for one that matches the specified user |
| 389 | * ID */ |
| 390 | read_lock(&rx->call_lock); |
| 391 | |
| 392 | p = rx->calls.rb_node; |
| 393 | while (p) { |
| 394 | call = rb_entry(p, struct rxrpc_call, sock_node); |
| 395 | |
| 396 | if (user_call_ID < call->user_call_ID) |
| 397 | p = p->rb_left; |
| 398 | else if (user_call_ID > call->user_call_ID) |
| 399 | p = p->rb_right; |
| 400 | else |
| 401 | goto found_extant_call; |
| 402 | } |
| 403 | |
| 404 | read_unlock(&rx->call_lock); |
| 405 | _leave(" = NULL"); |
| 406 | return NULL; |
| 407 | |
| 408 | /* we found the call in the list immediately */ |
| 409 | found_extant_call: |
| 410 | rxrpc_get_call(call); |
| 411 | read_unlock(&rx->call_lock); |
| 412 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); |
| 413 | return call; |
| 414 | } |
| 415 | |
| 416 | /* |
| 417 | * detach a call from a socket and set up for release |
| 418 | */ |
| 419 | void rxrpc_release_call(struct rxrpc_call *call) |
| 420 | { |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 421 | struct rxrpc_connection *conn = call->conn; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 422 | struct rxrpc_sock *rx = call->socket; |
| 423 | |
| 424 | _enter("{%d,%d,%d,%d}", |
| 425 | call->debug_id, atomic_read(&call->usage), |
| 426 | atomic_read(&call->ackr_not_idle), |
| 427 | call->rx_first_oos); |
| 428 | |
| 429 | spin_lock_bh(&call->lock); |
| 430 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
| 431 | BUG(); |
| 432 | spin_unlock_bh(&call->lock); |
| 433 | |
| 434 | /* dissociate from the socket |
| 435 | * - the socket's ref on the call is passed to the death timer |
| 436 | */ |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 437 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 438 | |
| 439 | write_lock_bh(&rx->call_lock); |
| 440 | if (!list_empty(&call->accept_link)) { |
| 441 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
| 442 | call, call->events, call->flags); |
| 443 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); |
| 444 | list_del_init(&call->accept_link); |
| 445 | sk_acceptq_removed(&rx->sk); |
| 446 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { |
| 447 | rb_erase(&call->sock_node, &rx->calls); |
| 448 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); |
| 449 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
| 450 | } |
| 451 | write_unlock_bh(&rx->call_lock); |
| 452 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 453 | /* free up the channel for reuse */ |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 454 | spin_lock(&conn->trans->client_lock); |
| 455 | write_lock_bh(&conn->lock); |
| 456 | write_lock(&call->state_lock); |
| 457 | |
| 458 | if (conn->channels[call->channel] == call) |
| 459 | conn->channels[call->channel] = NULL; |
| 460 | |
| 461 | if (conn->out_clientflag && conn->bundle) { |
| 462 | conn->avail_calls++; |
| 463 | switch (conn->avail_calls) { |
| 464 | case 1: |
| 465 | list_move_tail(&conn->bundle_link, |
| 466 | &conn->bundle->avail_conns); |
| 467 | case 2 ... RXRPC_MAXCALLS - 1: |
| 468 | ASSERT(conn->channels[0] == NULL || |
| 469 | conn->channels[1] == NULL || |
| 470 | conn->channels[2] == NULL || |
| 471 | conn->channels[3] == NULL); |
| 472 | break; |
| 473 | case RXRPC_MAXCALLS: |
| 474 | list_move_tail(&conn->bundle_link, |
| 475 | &conn->bundle->unused_conns); |
| 476 | ASSERT(conn->channels[0] == NULL && |
| 477 | conn->channels[1] == NULL && |
| 478 | conn->channels[2] == NULL && |
| 479 | conn->channels[3] == NULL); |
| 480 | break; |
| 481 | default: |
| 482 | printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n", |
| 483 | conn->avail_calls); |
| 484 | BUG(); |
| 485 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 486 | } |
| 487 | |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 488 | spin_unlock(&conn->trans->client_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 489 | |
| 490 | if (call->state < RXRPC_CALL_COMPLETE && |
| 491 | call->state != RXRPC_CALL_CLIENT_FINAL_ACK) { |
| 492 | _debug("+++ ABORTING STATE %d +++\n", call->state); |
| 493 | call->state = RXRPC_CALL_LOCALLY_ABORTED; |
| 494 | call->abort_code = RX_CALL_DEAD; |
| 495 | set_bit(RXRPC_CALL_ABORT, &call->events); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 496 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 497 | } |
| 498 | write_unlock(&call->state_lock); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 499 | write_unlock_bh(&conn->lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 500 | |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 501 | /* clean up the Rx queue */ |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 502 | if (!skb_queue_empty(&call->rx_queue) || |
| 503 | !skb_queue_empty(&call->rx_oos_queue)) { |
| 504 | struct rxrpc_skb_priv *sp; |
| 505 | struct sk_buff *skb; |
| 506 | |
| 507 | _debug("purge Rx queues"); |
| 508 | |
| 509 | spin_lock_bh(&call->lock); |
| 510 | while ((skb = skb_dequeue(&call->rx_queue)) || |
| 511 | (skb = skb_dequeue(&call->rx_oos_queue))) { |
| 512 | sp = rxrpc_skb(skb); |
| 513 | if (sp->call) { |
| 514 | ASSERTCMP(sp->call, ==, call); |
| 515 | rxrpc_put_call(call); |
| 516 | sp->call = NULL; |
| 517 | } |
| 518 | skb->destructor = NULL; |
| 519 | spin_unlock_bh(&call->lock); |
| 520 | |
| 521 | _debug("- zap %s %%%u #%u", |
| 522 | rxrpc_pkts[sp->hdr.type], |
| 523 | ntohl(sp->hdr.serial), |
| 524 | ntohl(sp->hdr.seq)); |
| 525 | rxrpc_free_skb(skb); |
| 526 | spin_lock_bh(&call->lock); |
| 527 | } |
| 528 | spin_unlock_bh(&call->lock); |
| 529 | |
| 530 | ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE); |
| 531 | } |
| 532 | |
| 533 | del_timer_sync(&call->resend_timer); |
| 534 | del_timer_sync(&call->ack_timer); |
| 535 | del_timer_sync(&call->lifetimer); |
| 536 | call->deadspan.expires = jiffies + rxrpc_dead_call_timeout * HZ; |
| 537 | add_timer(&call->deadspan); |
| 538 | |
| 539 | _leave(""); |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * handle a dead call being ready for reaping |
| 544 | */ |
| 545 | static void rxrpc_dead_call_expired(unsigned long _call) |
| 546 | { |
| 547 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 548 | |
| 549 | _enter("{%d}", call->debug_id); |
| 550 | |
| 551 | write_lock_bh(&call->state_lock); |
| 552 | call->state = RXRPC_CALL_DEAD; |
| 553 | write_unlock_bh(&call->state_lock); |
| 554 | rxrpc_put_call(call); |
| 555 | } |
| 556 | |
| 557 | /* |
| 558 | * mark a call as to be released, aborting it if it's still in progress |
| 559 | * - called with softirqs disabled |
| 560 | */ |
| 561 | static void rxrpc_mark_call_released(struct rxrpc_call *call) |
| 562 | { |
| 563 | bool sched; |
| 564 | |
| 565 | write_lock(&call->state_lock); |
| 566 | if (call->state < RXRPC_CALL_DEAD) { |
| 567 | sched = false; |
| 568 | if (call->state < RXRPC_CALL_COMPLETE) { |
| 569 | _debug("abort call %p", call); |
| 570 | call->state = RXRPC_CALL_LOCALLY_ABORTED; |
| 571 | call->abort_code = RX_CALL_DEAD; |
| 572 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) |
| 573 | sched = true; |
| 574 | } |
| 575 | if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) |
| 576 | sched = true; |
| 577 | if (sched) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 578 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 579 | } |
| 580 | write_unlock(&call->state_lock); |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * release all the calls associated with a socket |
| 585 | */ |
| 586 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) |
| 587 | { |
| 588 | struct rxrpc_call *call; |
| 589 | struct rb_node *p; |
| 590 | |
| 591 | _enter("%p", rx); |
| 592 | |
| 593 | read_lock_bh(&rx->call_lock); |
| 594 | |
| 595 | /* mark all the calls as no longer wanting incoming packets */ |
| 596 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { |
| 597 | call = rb_entry(p, struct rxrpc_call, sock_node); |
| 598 | rxrpc_mark_call_released(call); |
| 599 | } |
| 600 | |
| 601 | /* kill the not-yet-accepted incoming calls */ |
| 602 | list_for_each_entry(call, &rx->secureq, accept_link) { |
| 603 | rxrpc_mark_call_released(call); |
| 604 | } |
| 605 | |
| 606 | list_for_each_entry(call, &rx->acceptq, accept_link) { |
| 607 | rxrpc_mark_call_released(call); |
| 608 | } |
| 609 | |
| 610 | read_unlock_bh(&rx->call_lock); |
| 611 | _leave(""); |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * release a call |
| 616 | */ |
| 617 | void __rxrpc_put_call(struct rxrpc_call *call) |
| 618 | { |
| 619 | ASSERT(call != NULL); |
| 620 | |
| 621 | _enter("%p{u=%d}", call, atomic_read(&call->usage)); |
| 622 | |
| 623 | ASSERTCMP(atomic_read(&call->usage), >, 0); |
| 624 | |
| 625 | if (atomic_dec_and_test(&call->usage)) { |
| 626 | _debug("call %d dead", call->debug_id); |
| 627 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 628 | rxrpc_queue_work(&call->destroyer); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 629 | } |
| 630 | _leave(""); |
| 631 | } |
| 632 | |
| 633 | /* |
| 634 | * clean up a call |
| 635 | */ |
| 636 | static void rxrpc_cleanup_call(struct rxrpc_call *call) |
| 637 | { |
| 638 | _net("DESTROY CALL %d", call->debug_id); |
| 639 | |
| 640 | ASSERT(call->socket); |
| 641 | |
| 642 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); |
| 643 | |
| 644 | del_timer_sync(&call->lifetimer); |
| 645 | del_timer_sync(&call->deadspan); |
| 646 | del_timer_sync(&call->ack_timer); |
| 647 | del_timer_sync(&call->resend_timer); |
| 648 | |
| 649 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
| 650 | ASSERTCMP(call->events, ==, 0); |
| 651 | if (work_pending(&call->processor)) { |
| 652 | _debug("defer destroy"); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 653 | rxrpc_queue_work(&call->destroyer); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 654 | return; |
| 655 | } |
| 656 | |
| 657 | if (call->conn) { |
| 658 | spin_lock(&call->conn->trans->peer->lock); |
| 659 | list_del(&call->error_link); |
| 660 | spin_unlock(&call->conn->trans->peer->lock); |
| 661 | |
| 662 | write_lock_bh(&call->conn->lock); |
| 663 | rb_erase(&call->conn_node, &call->conn->calls); |
| 664 | write_unlock_bh(&call->conn->lock); |
| 665 | rxrpc_put_connection(call->conn); |
| 666 | } |
| 667 | |
| 668 | if (call->acks_window) { |
| 669 | _debug("kill Tx window %d", |
| 670 | CIRC_CNT(call->acks_head, call->acks_tail, |
| 671 | call->acks_winsz)); |
| 672 | smp_mb(); |
| 673 | while (CIRC_CNT(call->acks_head, call->acks_tail, |
| 674 | call->acks_winsz) > 0) { |
| 675 | struct rxrpc_skb_priv *sp; |
| 676 | unsigned long _skb; |
| 677 | |
| 678 | _skb = call->acks_window[call->acks_tail] & ~1; |
| 679 | sp = rxrpc_skb((struct sk_buff *) _skb); |
| 680 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); |
| 681 | rxrpc_free_skb((struct sk_buff *) _skb); |
| 682 | call->acks_tail = |
| 683 | (call->acks_tail + 1) & (call->acks_winsz - 1); |
| 684 | } |
| 685 | |
| 686 | kfree(call->acks_window); |
| 687 | } |
| 688 | |
| 689 | rxrpc_free_skb(call->tx_pending); |
| 690 | |
| 691 | rxrpc_purge_queue(&call->rx_queue); |
| 692 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); |
| 693 | sock_put(&call->socket->sk); |
| 694 | kmem_cache_free(rxrpc_call_jar, call); |
| 695 | } |
| 696 | |
| 697 | /* |
| 698 | * destroy a call |
| 699 | */ |
| 700 | static void rxrpc_destroy_call(struct work_struct *work) |
| 701 | { |
| 702 | struct rxrpc_call *call = |
| 703 | container_of(work, struct rxrpc_call, destroyer); |
| 704 | |
| 705 | _enter("%p{%d,%d,%p}", |
| 706 | call, atomic_read(&call->usage), call->channel, call->conn); |
| 707 | |
| 708 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); |
| 709 | |
| 710 | write_lock_bh(&rxrpc_call_lock); |
| 711 | list_del_init(&call->link); |
| 712 | write_unlock_bh(&rxrpc_call_lock); |
| 713 | |
| 714 | rxrpc_cleanup_call(call); |
| 715 | _leave(""); |
| 716 | } |
| 717 | |
| 718 | /* |
| 719 | * preemptively destroy all the call records from a transport endpoint rather |
| 720 | * than waiting for them to time out |
| 721 | */ |
| 722 | void __exit rxrpc_destroy_all_calls(void) |
| 723 | { |
| 724 | struct rxrpc_call *call; |
| 725 | |
| 726 | _enter(""); |
| 727 | write_lock_bh(&rxrpc_call_lock); |
| 728 | |
| 729 | while (!list_empty(&rxrpc_calls)) { |
| 730 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); |
| 731 | _debug("Zapping call %p", call); |
| 732 | |
| 733 | list_del_init(&call->link); |
| 734 | |
| 735 | switch (atomic_read(&call->usage)) { |
| 736 | case 0: |
| 737 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); |
| 738 | break; |
| 739 | case 1: |
| 740 | if (del_timer_sync(&call->deadspan) != 0 && |
| 741 | call->state != RXRPC_CALL_DEAD) |
| 742 | rxrpc_dead_call_expired((unsigned long) call); |
| 743 | if (call->state != RXRPC_CALL_DEAD) |
| 744 | break; |
| 745 | default: |
| 746 | printk(KERN_ERR "RXRPC:" |
| 747 | " Call %p still in use (%d,%d,%s,%lx,%lx)!\n", |
| 748 | call, atomic_read(&call->usage), |
| 749 | atomic_read(&call->ackr_not_idle), |
| 750 | rxrpc_call_states[call->state], |
| 751 | call->flags, call->events); |
| 752 | if (!skb_queue_empty(&call->rx_queue)) |
| 753 | printk(KERN_ERR"RXRPC: Rx queue occupied\n"); |
| 754 | if (!skb_queue_empty(&call->rx_oos_queue)) |
| 755 | printk(KERN_ERR"RXRPC: OOS queue occupied\n"); |
| 756 | break; |
| 757 | } |
| 758 | |
| 759 | write_unlock_bh(&rxrpc_call_lock); |
| 760 | cond_resched(); |
| 761 | write_lock_bh(&rxrpc_call_lock); |
| 762 | } |
| 763 | |
| 764 | write_unlock_bh(&rxrpc_call_lock); |
| 765 | _leave(""); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * handle call lifetime being exceeded |
| 770 | */ |
| 771 | static void rxrpc_call_life_expired(unsigned long _call) |
| 772 | { |
| 773 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 774 | |
| 775 | if (call->state >= RXRPC_CALL_COMPLETE) |
| 776 | return; |
| 777 | |
| 778 | _enter("{%d}", call->debug_id); |
| 779 | read_lock_bh(&call->state_lock); |
| 780 | if (call->state < RXRPC_CALL_COMPLETE) { |
| 781 | set_bit(RXRPC_CALL_LIFE_TIMER, &call->events); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 782 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 783 | } |
| 784 | read_unlock_bh(&call->state_lock); |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * handle resend timer expiry |
| 789 | */ |
| 790 | static void rxrpc_resend_time_expired(unsigned long _call) |
| 791 | { |
| 792 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 793 | |
| 794 | _enter("{%d}", call->debug_id); |
| 795 | |
| 796 | if (call->state >= RXRPC_CALL_COMPLETE) |
| 797 | return; |
| 798 | |
| 799 | read_lock_bh(&call->state_lock); |
| 800 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
| 801 | if (call->state < RXRPC_CALL_COMPLETE && |
| 802 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 803 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 804 | read_unlock_bh(&call->state_lock); |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * handle ACK timer expiry |
| 809 | */ |
| 810 | static void rxrpc_ack_time_expired(unsigned long _call) |
| 811 | { |
| 812 | struct rxrpc_call *call = (struct rxrpc_call *) _call; |
| 813 | |
| 814 | _enter("{%d}", call->debug_id); |
| 815 | |
| 816 | if (call->state >= RXRPC_CALL_COMPLETE) |
| 817 | return; |
| 818 | |
| 819 | read_lock_bh(&call->state_lock); |
| 820 | if (call->state < RXRPC_CALL_COMPLETE && |
| 821 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 822 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 823 | read_unlock_bh(&call->state_lock); |
| 824 | } |