include/linux/sunrpc/xprt.h

   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            (*abort_send_request)(struct rpc_rqst *req);
 156         void            (*wait_for_reply_request)(struct rpc_task *task);
 157         void            (*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
 158         void            (*release_request)(struct rpc_task *task);
 159         void            (*close)(struct rpc_xprt *xprt);
 160         void            (*destroy)(struct rpc_xprt *xprt);
 161         void            (*set_connect_timeout)(struct rpc_xprt *xprt,
 162                                         unsigned long connect_timeout,
 163                                         unsigned long reconnect_timeout);
 164         void            (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
 165         int             (*enable_swap)(struct rpc_xprt *xprt);
 166         void            (*disable_swap)(struct rpc_xprt *xprt);
 167         void            (*inject_disconnect)(struct rpc_xprt *xprt);
 168         int             (*bc_setup)(struct rpc_xprt *xprt,
 169                                     unsigned int min_reqs);
 170         size_t          (*bc_maxpayload)(struct rpc_xprt *xprt);
 171         unsigned int    (*bc_num_slots)(struct rpc_xprt *xprt);
 172         void            (*bc_free_rqst)(struct rpc_rqst *rqst);
 173         void            (*bc_destroy)(struct rpc_xprt *xprt,
 174                                       unsigned int max_reqs);
 175 };
 176
 177 /*
 178  * RPC transport identifiers
 179  *
 180  * To preserve compatibility with the historical use of raw IP protocol
 181  * id's for transport selection, UDP and TCP identifiers are specified
 182  * with the previous values. No such restriction exists for new transports,
 183  * except that they may not collide with these values (17 and 6,
 184  * respectively).
 185  */
 186 #define XPRT_TRANSPORT_BC       (1 << 31)
 187 enum xprt_transports {
 188         XPRT_TRANSPORT_UDP      = IPPROTO_UDP,
 189         XPRT_TRANSPORT_TCP      = IPPROTO_TCP,
 190         XPRT_TRANSPORT_BC_TCP   = IPPROTO_TCP | XPRT_TRANSPORT_BC,
 191         XPRT_TRANSPORT_RDMA     = 256,
 192         XPRT_TRANSPORT_BC_RDMA  = XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
 193         XPRT_TRANSPORT_LOCAL    = 257,
 194         XPRT_TRANSPORT_TCP_TLS  = 258,
 195 };
 196
 197 struct rpc_sysfs_xprt;
 198 struct rpc_xprt {
 199         struct kref             kref;           /* Reference count */
 200         const struct rpc_xprt_ops *ops;         /* transport methods */
 201         unsigned int            id;             /* transport id */
 202
 203         const struct rpc_timeout *timeout;      /* timeout parms */
 204         struct sockaddr_storage addr;           /* server address */
 205         size_t                  addrlen;        /* size of server address */
 206         int                     prot;           /* IP protocol */
 207
 208         unsigned long           cong;           /* current congestion */
 209         unsigned long           cwnd;           /* congestion window */
 210
 211         size_t                  max_payload;    /* largest RPC payload size,
 212                                                    in bytes */
 213
 214         struct rpc_wait_queue   binding;        /* requests waiting on rpcbind */
 215         struct rpc_wait_queue   sending;        /* requests waiting to send */
 216         struct rpc_wait_queue   pending;        /* requests in flight */
 217         struct rpc_wait_queue   backlog;        /* waiting for slot */
 218         struct list_head        free;           /* free slots */
 219         unsigned int            max_reqs;       /* max number of slots */
 220         unsigned int            min_reqs;       /* min number of slots */
 221         unsigned int            num_reqs;       /* total slots */
 222         unsigned long           state;          /* transport state */
 223         unsigned char           resvport   : 1, /* use a reserved port */
 224                                 reuseport  : 1; /* reuse port on reconnect */
 225         atomic_t                swapper;        /* we're swapping over this
 226                                                    transport */
 227         unsigned int            bind_index;     /* bind function index */
 228
 229         /*
 230          * Multipath
 231          */
 232         struct list_head        xprt_switch;
 233
 234         /*
 235          * Connection of transports
 236          */
 237         unsigned long           bind_timeout,
 238                                 reestablish_timeout;
 239         struct xprtsec_parms    xprtsec;
 240         unsigned int            connect_cookie; /* A cookie that gets bumped
 241                                                    every time the transport
 242                                                    is reconnected */
 243
 244         /*
 245          * Disconnection of idle transports
 246          */
 247         struct work_struct      task_cleanup;
 248         struct timer_list       timer;
 249         unsigned long           last_used,
 250                                 idle_timeout,
 251                                 connect_timeout,
 252                                 max_reconnect_timeout;
 253
 254         /*
 255          * Send stuff
 256          */
 257         atomic_long_t           queuelen;
 258         spinlock_t              transport_lock; /* lock transport info */
 259         spinlock_t              reserve_lock;   /* lock slot table */
 260         spinlock_t              queue_lock;     /* send/receive queue lock */
 261         u32                     xid;            /* Next XID value to use */
 262         struct rpc_task *       snd_task;       /* Task blocked in send */
 263
 264         struct list_head        xmit_queue;     /* Send queue */
 265         atomic_long_t           xmit_queuelen;
 266
 267         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 268 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 269         struct svc_serv         *bc_serv;       /* The RPC service which will */
 270                                                 /* process the callback */
 271         unsigned int            bc_alloc_max;
 272         unsigned int            bc_alloc_count; /* Total number of preallocs */
 273         atomic_t                bc_slot_count;  /* Number of allocated slots */
 274         spinlock_t              bc_pa_lock;     /* Protects the preallocated
 275                                                  * items */
 276         struct list_head        bc_pa_list;     /* List of preallocated
 277                                                  * backchannel rpc_rqst's */
 278 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 279
 280         struct rb_root          recv_queue;     /* Receive queue */
 281
 282         struct {
 283                 unsigned long           bind_count,     /* total number of binds */
 284                                         connect_count,  /* total number of connects */
 285                                         connect_start,  /* connect start timestamp */
 286                                         connect_time,   /* jiffies waiting for connect */
 287                                         sends,          /* how many complete requests */
 288                                         recvs,          /* how many complete requests */
 289                                         bad_xids,       /* lookup_rqst didn't find XID */
 290                                         max_slots;      /* max rpc_slots used */
 291
 292                 unsigned long long      req_u,          /* average requests on the wire */
 293                                         bklog_u,        /* backlog queue utilization */
 294                                         sending_u,      /* send q utilization */
 295                                         pending_u;      /* pend q utilization */
 296         } stat;
 297
 298         struct net              *xprt_net;
 299         netns_tracker           ns_tracker;
 300         const char              *servername;
 301         const char              *address_strings[RPC_DISPLAY_MAX];
 302 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 303         struct dentry           *debugfs;               /* debugfs directory */
 304 #endif
 305         struct rcu_head         rcu;
 306         const struct xprt_class *xprt_class;
 307         struct rpc_sysfs_xprt   *xprt_sysfs;
 308         bool                    main; /*mark if this is the 1st transport */
 309 };
 310
 311 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 312 /*
 313  * Backchannel flags
 314  */
 315 #define RPC_BC_PA_IN_USE        0x0001          /* Preallocated backchannel */
 316                                                 /* buffer in use */
 317 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 318
 319 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 320 static inline int bc_prealloc(struct rpc_rqst *req)
 321 {
 322         return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
 323 }
 324 #else
 325 static inline int bc_prealloc(struct rpc_rqst *req)
 326 {
 327         return 0;
 328 }
 329 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 330
 331 #define XPRT_CREATE_INFINITE_SLOTS      (1U)
 332 #define XPRT_CREATE_NO_IDLE_TIMEOUT     (1U << 1)
 333
 334 struct xprt_create {
 335         int                     ident;          /* XPRT_TRANSPORT identifier */
 336         struct net *            net;
 337         struct sockaddr *       srcaddr;        /* optional local address */
 338         struct sockaddr *       dstaddr;        /* remote peer address */
 339         size_t                  addrlen;
 340         const char              *servername;
 341         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 342         struct rpc_xprt_switch  *bc_xps;
 343         unsigned int            flags;
 344         struct xprtsec_parms    xprtsec;
 345         unsigned long           connect_timeout;
 346         unsigned long           reconnect_timeout;
 347 };
 348
 349 struct xprt_class {
 350         struct list_head        list;
 351         int                     ident;          /* XPRT_TRANSPORT identifier */
 352         struct rpc_xprt *       (*setup)(struct xprt_create *);
 353         struct module           *owner;
 354         char                    name[32];
 355         const char *            netid[];
 356 };
 357
 358 /*
 359  * Generic internal transport functions
 360  */
 361 struct rpc_xprt         *xprt_create_transport(struct xprt_create *args);
 362 void                    xprt_connect(struct rpc_task *task);
 363 unsigned long           xprt_reconnect_delay(const struct rpc_xprt *xprt);
 364 void                    xprt_reconnect_backoff(struct rpc_xprt *xprt,
 365                                                unsigned long init_to);
 366 void                    xprt_reserve(struct rpc_task *task);
 367 void                    xprt_retry_reserve(struct rpc_task *task);
 368 int                     xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
 369 int                     xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 370 void                    xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
 371 void                    xprt_free_slot(struct rpc_xprt *xprt,
 372                                        struct rpc_rqst *req);
 373 bool                    xprt_prepare_transmit(struct rpc_task *task);
 374 void                    xprt_request_enqueue_transmit(struct rpc_task *task);
 375 int                     xprt_request_enqueue_receive(struct rpc_task *task);
 376 void                    xprt_request_wait_receive(struct rpc_task *task);
 377 void                    xprt_request_dequeue_xprt(struct rpc_task *task);
 378 bool                    xprt_request_need_retransmit(struct rpc_task *task);
 379 void                    xprt_transmit(struct rpc_task *task);
 380 void                    xprt_end_transmit(struct rpc_task *task);
 381 int                     xprt_adjust_timeout(struct rpc_rqst *req);
 382 void                    xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
 383 void                    xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 384 void                    xprt_release(struct rpc_task *task);
 385 struct rpc_xprt *       xprt_get(struct rpc_xprt *xprt);
 386 void                    xprt_put(struct rpc_xprt *xprt);
 387 struct rpc_xprt *       xprt_alloc(struct net *net, size_t size,
 388                                 unsigned int num_prealloc,
 389                                 unsigned int max_req);
 390 void                    xprt_free(struct rpc_xprt *);
 391 void                    xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task);
 392 bool                    xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req);
 393 void                    xprt_cleanup_ids(void);
 394
 395 static inline int
 396 xprt_enable_swap(struct rpc_xprt *xprt)
 397 {
 398         return xprt->ops->enable_swap(xprt);
 399 }
 400
 401 static inline void
 402 xprt_disable_swap(struct rpc_xprt *xprt)
 403 {
 404         xprt->ops->disable_swap(xprt);
 405 }
 406
 407 /*
 408  * Transport switch helper functions
 409  */
 410 int                     xprt_register_transport(struct xprt_class *type);
 411 int                     xprt_unregister_transport(struct xprt_class *type);
 412 int                     xprt_find_transport_ident(const char *);
 413 void                    xprt_wait_for_reply_request_def(struct rpc_task *task);
 414 void                    xprt_wait_for_reply_request_rtt(struct rpc_task *task);
 415 void                    xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
 416 void                    xprt_wait_for_buffer_space(struct rpc_xprt *xprt);
 417 bool                    xprt_write_space(struct rpc_xprt *xprt);
 418 void                    xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
 419 struct rpc_rqst *       xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
 420 void                    xprt_update_rtt(struct rpc_task *task);
 421 void                    xprt_complete_rqst(struct rpc_task *task, int copied);
 422 void                    xprt_pin_rqst(struct rpc_rqst *req);
 423 void                    xprt_unpin_rqst(struct rpc_rqst *req);
 424 void                    xprt_release_rqst_cong(struct rpc_task *task);
 425 bool                    xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req);
 426 void                    xprt_disconnect_done(struct rpc_xprt *xprt);
 427 void                    xprt_force_disconnect(struct rpc_xprt *xprt);
 428 void                    xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
 429
 430 bool                    xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
 431 void                    xprt_unlock_connect(struct rpc_xprt *, void *);
 432 void                    xprt_release_write(struct rpc_xprt *, struct rpc_task *);
 433
 434 /*
 435  * Reserved bit positions in xprt->state
 436  */
 437 #define XPRT_LOCKED             (0)
 438 #define XPRT_CONNECTED          (1)
 439 #define XPRT_CONNECTING         (2)
 440 #define XPRT_CLOSE_WAIT         (3)
 441 #define XPRT_BOUND              (4)
 442 #define XPRT_BINDING            (5)
 443 #define XPRT_CLOSING            (6)
 444 #define XPRT_OFFLINE            (7)
 445 #define XPRT_REMOVE             (8)
 446 #define XPRT_CONGESTED          (9)
 447 #define XPRT_CWND_WAIT          (10)
 448 #define XPRT_WRITE_SPACE        (11)
 449 #define XPRT_SND_IS_COOKIE      (12)
 450
 451 static inline void xprt_set_connected(struct rpc_xprt *xprt)
 452 {
 453         set_bit(XPRT_CONNECTED, &xprt->state);
 454 }
 455
 456 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
 457 {
 458         clear_bit(XPRT_CONNECTED, &xprt->state);
 459 }
 460
 461 static inline int xprt_connected(struct rpc_xprt *xprt)
 462 {
 463         return test_bit(XPRT_CONNECTED, &xprt->state);
 464 }
 465
 466 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
 467 {
 468         return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
 469 }
 470
 471 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
 472 {
 473         return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
 474 }
 475
 476 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
 477 {
 478         smp_mb__before_atomic();
 479         clear_bit(XPRT_CONNECTING, &xprt->state);
 480         smp_mb__after_atomic();
 481 }
 482
 483 static inline int xprt_connecting(struct rpc_xprt *xprt)
 484 {
 485         return test_bit(XPRT_CONNECTING, &xprt->state);
 486 }
 487
 488 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
 489 {
 490         return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
 491 }
 492
 493 static inline void xprt_set_bound(struct rpc_xprt *xprt)
 494 {
 495         test_and_set_bit(XPRT_BOUND, &xprt->state);
 496 }
 497
 498 static inline int xprt_bound(struct rpc_xprt *xprt)
 499 {
 500         return test_bit(XPRT_BOUND, &xprt->state);
 501 }
 502
 503 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
 504 {
 505         clear_bit(XPRT_BOUND, &xprt->state);
 506 }
 507
 508 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
 509 {
 510         smp_mb__before_atomic();
 511         clear_bit(XPRT_BINDING, &xprt->state);
 512         smp_mb__after_atomic();
 513 }
 514
 515 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
 516 {
 517         return test_and_set_bit(XPRT_BINDING, &xprt->state);
 518 }
 519
 520 void xprt_set_offline_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
 521 void xprt_set_online_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
 522 void xprt_delete_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
 523 #endif /* _LINUX_SUNRPC_XPRT_H */