1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/include/linux/sunrpc/xprt.h 4 * 5 * Declarations for the RPC transport interface. 6 * 7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 8 */ 9 10 #ifndef _LINUX_SUNRPC_XPRT_H 11 #define _LINUX_SUNRPC_XPRT_H 12 13 #include <linux/uio.h> 14 #include <linux/socket.h> 15 #include <linux/in.h> 16 #include <linux/ktime.h> 17 #include <linux/kref.h> 18 #include <linux/sunrpc/sched.h> 19 #include <linux/sunrpc/xdr.h> 20 #include <linux/sunrpc/msg_prot.h> 21 22 #define RPC_MIN_SLOT_TABLE (2U) 23 #define RPC_DEF_SLOT_TABLE (16U) 24 #define RPC_MAX_SLOT_TABLE_LIMIT (65536U) 25 #define RPC_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE_LIMIT 26 27 #define RPC_CWNDSHIFT (8U) 28 #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) 29 #define RPC_INITCWND RPC_CWNDSCALE 30 #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) 31 #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) 32 33 enum rpc_display_format_t { 34 RPC_DISPLAY_ADDR = 0, 35 RPC_DISPLAY_PORT, 36 RPC_DISPLAY_PROTO, 37 RPC_DISPLAY_HEX_ADDR, 38 RPC_DISPLAY_HEX_PORT, 39 RPC_DISPLAY_NETID, 40 RPC_DISPLAY_MAX, 41 }; 42 43 struct rpc_task; 44 struct rpc_xprt; 45 struct xprt_class; 46 struct seq_file; 47 struct svc_serv; 48 struct net; 49 #include <linux/lwq.h> 50 51 /* 52 * This describes a complete RPC request 53 */ 54 struct rpc_rqst { 55 /* 56 * This is the user-visible part 57 */ 58 struct rpc_xprt * rq_xprt; /* RPC client */ 59 struct xdr_buf rq_snd_buf; /* send buffer */ 60 struct xdr_buf rq_rcv_buf; /* recv buffer */ 61 62 /* 63 * This is the private part 64 */ 65 struct rpc_task * rq_task; /* RPC task data */ 66 struct rpc_cred * rq_cred; /* Bound cred */ 67 __be32 rq_xid; /* request XID */ 68 int rq_cong; /* has incremented xprt->cong */ 69 u32 rq_seqno; /* gss seq no. used on req. */ 70 int rq_enc_pages_num; 71 struct page **rq_enc_pages; /* scratch pages for use by 72 gss privacy code */ 73 void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */ 74 75 union { 76 struct list_head rq_list; /* Slot allocation list */ 77 struct rb_node rq_recv; /* Receive queue */ 78 }; 79 80 struct list_head rq_xmit; /* Send queue */ 81 struct list_head rq_xmit2; /* Send queue */ 82 83 void *rq_buffer; /* Call XDR encode buffer */ 84 size_t rq_callsize; 85 void *rq_rbuffer; /* Reply XDR decode buffer */ 86 size_t rq_rcvsize; 87 size_t rq_xmit_bytes_sent; /* total bytes sent */ 88 size_t rq_reply_bytes_recvd; /* total reply bytes */ 89 /* received */ 90 91 struct xdr_buf rq_private_buf; /* The receive buffer 92 * used in the softirq. 93 */ 94 unsigned long rq_majortimeo; /* major timeout alarm */ 95 unsigned long rq_minortimeo; /* minor timeout alarm */ 96 unsigned long rq_timeout; /* Current timeout value */ 97 ktime_t rq_rtt; /* round-trip time */ 98 unsigned int rq_retries; /* # of retries */ 99 unsigned int rq_connect_cookie; 100 /* A cookie used to track the 101 state of the transport 102 connection */ 103 atomic_t rq_pin; 104 105 /* 106 * Partial send handling 107 */ 108 u32 rq_bytes_sent; /* Bytes we have sent */ 109 110 ktime_t rq_xtime; /* transmit time stamp */ 111 int rq_ntrans; 112 113 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 114 struct lwq_node rq_bc_list; /* Callback service list */ 115 unsigned long rq_bc_pa_state; /* Backchannel prealloc state */ 116 struct list_head rq_bc_pa_list; /* Backchannel prealloc list */ 117 #endif /* CONFIG_SUNRPC_BACKCHANEL */ 118 }; 119 #define rq_svec rq_snd_buf.head 120 #define rq_slen rq_snd_buf.len 121 122 /* RPC transport layer security policies */ 123 enum xprtsec_policies { 124 RPC_XPRTSEC_NONE = 0, 125 RPC_XPRTSEC_TLS_ANON, 126 RPC_XPRTSEC_TLS_X509, 127 }; 128 129 struct xprtsec_parms { 130 enum xprtsec_policies policy; 131 132 /* authentication material */ 133 key_serial_t cert_serial; 134 key_serial_t privkey_serial; 135 }; 136 137 struct rpc_xprt_ops { 138 void (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize); 139 int (*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task); 140 void (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task); 141 void (*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task); 142 void (*free_slot)(struct rpc_xprt *xprt, 143 struct rpc_rqst *req); 144 void (*rpcbind)(struct rpc_task *task); 145 void (*set_port)(struct rpc_xprt *xprt, unsigned short port); 146 void (*connect)(struct rpc_xprt *xprt, struct rpc_task *task); 147 int (*get_srcaddr)(struct rpc_xprt *xprt, char *buf, 148 size_t buflen); 149 unsigned short (*get_srcport)(struct rpc_xprt *xprt); 150 int (*buf_alloc)(struct rpc_task *task); 151 void (*buf_free)(struct rpc_task *task); 152 int (*prepare_request)(struct rpc_rqst *req, 153 struct xdr_buf *buf); 154 int (*send_request)(struct rpc_rqst *req); 155 void (*wait_for_reply_request)(struct rpc_task *task); 156 void (*timer)(struct rpc_xprt *xprt, struct rpc_task *task); 157 void (*release_request)(struct rpc_task *task); 158 void (*close)(struct rpc_xprt *xprt); 159 void (*destroy)(struct rpc_xprt *xprt); 160 void (*set_connect_timeout)(struct rpc_xprt *xprt, 161 unsigned long connect_timeout, 162 unsigned long reconnect_timeout); 163 void (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq); 164 int (*enable_swap)(struct rpc_xprt *xprt); 165 void (*disable_swap)(struct rpc_xprt *xprt); 166 void (*inject_disconnect)(struct rpc_xprt *xprt); 167 int (*bc_setup)(struct rpc_xprt *xprt, 168 unsigned int min_reqs); 169 size_t (*bc_maxpayload)(struct rpc_xprt *xprt); 170 unsigned int (*bc_num_slots)(struct rpc_xprt *xprt); 171 void (*bc_free_rqst)(struct rpc_rqst *rqst); 172 void (*bc_destroy)(struct rpc_xprt *xprt, 173 unsigned int max_reqs); 174 }; 175 176 /* 177 * RPC transport identifiers 178 * 179 * To preserve compatibility with the historical use of raw IP protocol 180 * id's for transport selection, UDP and TCP identifiers are specified 181 * with the previous values. No such restriction exists for new transports, 182 * except that they may not collide with these values (17 and 6, 183 * respectively). 184 */ 185 #define XPRT_TRANSPORT_BC (1 << 31) 186 enum xprt_transports { 187 XPRT_TRANSPORT_UDP = IPPROTO_UDP, 188 XPRT_TRANSPORT_TCP = IPPROTO_TCP, 189 XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP | XPRT_TRANSPORT_BC, 190 XPRT_TRANSPORT_RDMA = 256, 191 XPRT_TRANSPORT_BC_RDMA = XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC, 192 XPRT_TRANSPORT_LOCAL = 257, 193 XPRT_TRANSPORT_TCP_TLS = 258, 194 }; 195 196 struct rpc_sysfs_xprt; 197 struct rpc_xprt { 198 struct kref kref; /* Reference count */ 199 const struct rpc_xprt_ops *ops; /* transport methods */ 200 unsigned int id; /* transport id */ 201 202 const struct rpc_timeout *timeout; /* timeout parms */ 203 struct sockaddr_storage addr; /* server address */ 204 size_t addrlen; /* size of server address */ 205 int prot; /* IP protocol */ 206 207 unsigned long cong; /* current congestion */ 208 unsigned long cwnd; /* congestion window */ 209 210 size_t max_payload; /* largest RPC payload size, 211 in bytes */ 212 213 struct rpc_wait_queue binding; /* requests waiting on rpcbind */ 214 struct rpc_wait_queue sending; /* requests waiting to send */ 215 struct rpc_wait_queue pending; /* requests in flight */ 216 struct rpc_wait_queue backlog; /* waiting for slot */ 217 struct list_head free; /* free slots */ 218 unsigned int max_reqs; /* max number of slots */ 219 unsigned int min_reqs; /* min number of slots */ 220 unsigned int num_reqs; /* total slots */ 221 unsigned long state; /* transport state */ 222 unsigned char resvport : 1, /* use a reserved port */ 223 reuseport : 1; /* reuse port on reconnect */ 224 atomic_t swapper; /* we're swapping over this 225 transport */ 226 unsigned int bind_index; /* bind function index */ 227 228 /* 229 * Multipath 230 */ 231 struct list_head xprt_switch; 232 233 /* 234 * Connection of transports 235 */ 236 unsigned long bind_timeout, 237 reestablish_timeout; 238 struct xprtsec_parms xprtsec; 239 unsigned int connect_cookie; /* A cookie that gets bumped 240 every time the transport 241 is reconnected */ 242 243 /* 244 * Disconnection of idle transports 245 */ 246 struct work_struct task_cleanup; 247 struct timer_list timer; 248 unsigned long last_used, 249 idle_timeout, 250 connect_timeout, 251 max_reconnect_timeout; 252 253 /* 254 * Send stuff 255 */ 256 atomic_long_t queuelen; 257 spinlock_t transport_lock; /* lock transport info */ 258 spinlock_t reserve_lock; /* lock slot table */ 259 spinlock_t queue_lock; /* send/receive queue lock */ 260 u32 xid; /* Next XID value to use */ 261 struct rpc_task * snd_task; /* Task blocked in send */ 262 263 struct list_head xmit_queue; /* Send queue */ 264 atomic_long_t xmit_queuelen; 265 266 struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */ 267 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 268 struct svc_serv *bc_serv; /* The RPC service which will */ 269 /* process the callback */ 270 unsigned int bc_alloc_max; 271 unsigned int bc_alloc_count; /* Total number of preallocs */ 272 atomic_t bc_slot_count; /* Number of allocated slots */ 273 spinlock_t bc_pa_lock; /* Protects the preallocated 274 * items */ 275 struct list_head bc_pa_list; /* List of preallocated 276 * backchannel rpc_rqst's */ 277 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 278 279 struct rb_root recv_queue; /* Receive queue */ 280 281 struct { 282 unsigned long bind_count, /* total number of binds */ 283 connect_count, /* total number of connects */ 284 connect_start, /* connect start timestamp */ 285 connect_time, /* jiffies waiting for connect */ 286 sends, /* how many complete requests */ 287 recvs, /* how many complete requests */ 288 bad_xids, /* lookup_rqst didn't find XID */ 289 max_slots; /* max rpc_slots used */ 290 291 unsigned long long req_u, /* average requests on the wire */ 292 bklog_u, /* backlog queue utilization */ 293 sending_u, /* send q utilization */ 294 pending_u; /* pend q utilization */ 295 } stat; 296 297 struct net *xprt_net; 298 netns_tracker ns_tracker; 299 const char *servername; 300 const char *address_strings[RPC_DISPLAY_MAX]; 301 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 302 struct dentry *debugfs; /* debugfs directory */ 303 #endif 304 struct rcu_head rcu; 305 const struct xprt_class *xprt_class; 306 struct rpc_sysfs_xprt *xprt_sysfs; 307 bool main; /*mark if this is the 1st transport */ 308 }; 309 310 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 311 /* 312 * Backchannel flags 313 */ 314 #define RPC_BC_PA_IN_USE 0x0001 /* Preallocated backchannel */ 315 /* buffer in use */ 316 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 317 318 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 319 static inline int bc_prealloc(struct rpc_rqst *req) 320 { 321 return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state); 322 } 323 #else 324 static inline int bc_prealloc(struct rpc_rqst *req) 325 { 326 return 0; 327 } 328 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 329 330 #define XPRT_CREATE_INFINITE_SLOTS (1U) 331 #define XPRT_CREATE_NO_IDLE_TIMEOUT (1U << 1) 332 333 struct xprt_create { 334 int ident; /* XPRT_TRANSPORT identifier */ 335 struct net * net; 336 struct sockaddr * srcaddr; /* optional local address */ 337 struct sockaddr * dstaddr; /* remote peer address */ 338 size_t addrlen; 339 const char *servername; 340 struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */ 341 struct rpc_xprt_switch *bc_xps; 342 unsigned int flags; 343 struct xprtsec_parms xprtsec; 344 unsigned long connect_timeout; 345 unsigned long reconnect_timeout; 346 }; 347 348 struct xprt_class { 349 struct list_head list; 350 int ident; /* XPRT_TRANSPORT identifier */ 351 struct rpc_xprt * (*setup)(struct xprt_create *); 352 struct module *owner; 353 char name[32]; 354 const char * netid[]; 355 }; 356 357 /* 358 * Generic internal transport functions 359 */ 360 struct rpc_xprt *xprt_create_transport(struct xprt_create *args); 361 void xprt_connect(struct rpc_task *task); 362 unsigned long xprt_reconnect_delay(const struct rpc_xprt *xprt); 363 void xprt_reconnect_backoff(struct rpc_xprt *xprt, 364 unsigned long init_to); 365 void xprt_reserve(struct rpc_task *task); 366 void xprt_retry_reserve(struct rpc_task *task); 367 int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task); 368 int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task); 369 void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task); 370 void xprt_free_slot(struct rpc_xprt *xprt, 371 struct rpc_rqst *req); 372 bool xprt_prepare_transmit(struct rpc_task *task); 373 void xprt_request_enqueue_transmit(struct rpc_task *task); 374 int xprt_request_enqueue_receive(struct rpc_task *task); 375 void xprt_request_wait_receive(struct rpc_task *task); 376 void xprt_request_dequeue_xprt(struct rpc_task *task); 377 bool xprt_request_need_retransmit(struct rpc_task *task); 378 void xprt_transmit(struct rpc_task *task); 379 void xprt_end_transmit(struct rpc_task *task); 380 int xprt_adjust_timeout(struct rpc_rqst *req); 381 void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task); 382 void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task); 383 void xprt_release(struct rpc_task *task); 384 struct rpc_xprt * xprt_get(struct rpc_xprt *xprt); 385 void xprt_put(struct rpc_xprt *xprt); 386 struct rpc_xprt * xprt_alloc(struct net *net, size_t size, 387 unsigned int num_prealloc, 388 unsigned int max_req); 389 void xprt_free(struct rpc_xprt *); 390 void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task); 391 bool xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req); 392 void xprt_cleanup_ids(void); 393 394 static inline int 395 xprt_enable_swap(struct rpc_xprt *xprt) 396 { 397 return xprt->ops->enable_swap(xprt); 398 } 399 400 static inline void 401 xprt_disable_swap(struct rpc_xprt *xprt) 402 { 403 xprt->ops->disable_swap(xprt); 404 } 405 406 /* 407 * Transport switch helper functions 408 */ 409 int xprt_register_transport(struct xprt_class *type); 410 int xprt_unregister_transport(struct xprt_class *type); 411 int xprt_find_transport_ident(const char *); 412 void xprt_wait_for_reply_request_def(struct rpc_task *task); 413 void xprt_wait_for_reply_request_rtt(struct rpc_task *task); 414 void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status); 415 void xprt_wait_for_buffer_space(struct rpc_xprt *xprt); 416 bool xprt_write_space(struct rpc_xprt *xprt); 417 void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result); 418 struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid); 419 void xprt_update_rtt(struct rpc_task *task); 420 void xprt_complete_rqst(struct rpc_task *task, int copied); 421 void xprt_pin_rqst(struct rpc_rqst *req); 422 void xprt_unpin_rqst(struct rpc_rqst *req); 423 void xprt_release_rqst_cong(struct rpc_task *task); 424 bool xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req); 425 void xprt_disconnect_done(struct rpc_xprt *xprt); 426 void xprt_force_disconnect(struct rpc_xprt *xprt); 427 void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie); 428 429 bool xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *); 430 void xprt_unlock_connect(struct rpc_xprt *, void *); 431 void xprt_release_write(struct rpc_xprt *, struct rpc_task *); 432 433 /* 434 * Reserved bit positions in xprt->state 435 */ 436 #define XPRT_LOCKED (0) 437 #define XPRT_CONNECTED (1) 438 #define XPRT_CONNECTING (2) 439 #define XPRT_CLOSE_WAIT (3) 440 #define XPRT_BOUND (4) 441 #define XPRT_BINDING (5) 442 #define XPRT_CLOSING (6) 443 #define XPRT_OFFLINE (7) 444 #define XPRT_REMOVE (8) 445 #define XPRT_CONGESTED (9) 446 #define XPRT_CWND_WAIT (10) 447 #define XPRT_WRITE_SPACE (11) 448 #define XPRT_SND_IS_COOKIE (12) 449 450 static inline void xprt_set_connected(struct rpc_xprt *xprt) 451 { 452 set_bit(XPRT_CONNECTED, &xprt->state); 453 } 454 455 static inline void xprt_clear_connected(struct rpc_xprt *xprt) 456 { 457 clear_bit(XPRT_CONNECTED, &xprt->state); 458 } 459 460 static inline int xprt_connected(struct rpc_xprt *xprt) 461 { 462 return test_bit(XPRT_CONNECTED, &xprt->state); 463 } 464 465 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt) 466 { 467 return test_and_set_bit(XPRT_CONNECTED, &xprt->state); 468 } 469 470 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt) 471 { 472 return test_and_clear_bit(XPRT_CONNECTED, &xprt->state); 473 } 474 475 static inline void xprt_clear_connecting(struct rpc_xprt *xprt) 476 { 477 smp_mb__before_atomic(); 478 clear_bit(XPRT_CONNECTING, &xprt->state); 479 smp_mb__after_atomic(); 480 } 481 482 static inline int xprt_connecting(struct rpc_xprt *xprt) 483 { 484 return test_bit(XPRT_CONNECTING, &xprt->state); 485 } 486 487 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt) 488 { 489 return test_and_set_bit(XPRT_CONNECTING, &xprt->state); 490 } 491 492 static inline void xprt_set_bound(struct rpc_xprt *xprt) 493 { 494 test_and_set_bit(XPRT_BOUND, &xprt->state); 495 } 496 497 static inline int xprt_bound(struct rpc_xprt *xprt) 498 { 499 return test_bit(XPRT_BOUND, &xprt->state); 500 } 501 502 static inline void xprt_clear_bound(struct rpc_xprt *xprt) 503 { 504 clear_bit(XPRT_BOUND, &xprt->state); 505 } 506 507 static inline void xprt_clear_binding(struct rpc_xprt *xprt) 508 { 509 smp_mb__before_atomic(); 510 clear_bit(XPRT_BINDING, &xprt->state); 511 smp_mb__after_atomic(); 512 } 513 514 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt) 515 { 516 return test_and_set_bit(XPRT_BINDING, &xprt->state); 517 } 518 519 void xprt_set_offline_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps); 520 void xprt_set_online_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps); 521 void xprt_delete_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps); 522 #endif /* _LINUX_SUNRPC_XPRT_H */ 523