include/linux/sunrpc/xprt.h

   1 /*
   2  *  linux/include/linux/sunrpc/xprt.h
   3  *
   4  *  Declarations for the RPC transport interface.
   5  *
   6  *  Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifndef _LINUX_SUNRPC_XPRT_H
  10 #define _LINUX_SUNRPC_XPRT_H
  11
  12 #include <linux/uio.h>
  13 #include <linux/socket.h>
  14 #include <linux/in.h>
  15 #include <linux/kref.h>
  16 #include <linux/sunrpc/sched.h>
  17 #include <linux/sunrpc/xdr.h>
  18 #include <linux/sunrpc/msg_prot.h>
  19
  20 #ifdef __KERNEL__
  21
  22 extern unsigned int xprt_udp_slot_table_entries;
  23 extern unsigned int xprt_tcp_slot_table_entries;
  24
  25 #define RPC_MIN_SLOT_TABLE      (2U)
  26 #define RPC_DEF_SLOT_TABLE      (16U)
  27 #define RPC_MAX_SLOT_TABLE      (128U)
  28
  29 /*
  30  * Parameters for choosing a free port
  31  */
  32 extern unsigned int xprt_min_resvport;
  33 extern unsigned int xprt_max_resvport;
  34
  35 #define RPC_MIN_RESVPORT        (1U)
  36 #define RPC_MAX_RESVPORT        (65535U)
  37 #define RPC_DEF_MIN_RESVPORT    (665U)
  38 #define RPC_DEF_MAX_RESVPORT    (1023U)
  39
  40 /*
  41  * This describes a timeout strategy
  42  */
  43 struct rpc_timeout {
  44         unsigned long           to_initval,             /* initial timeout */
  45                                 to_maxval,              /* max timeout */
  46                                 to_increment;           /* if !exponential */
  47         unsigned int            to_retries;             /* max # of retries */
  48         unsigned char           to_exponential;
  49 };
  50
  51 enum rpc_display_format_t {
  52         RPC_DISPLAY_ADDR = 0,
  53         RPC_DISPLAY_PORT,
  54         RPC_DISPLAY_PROTO,
  55         RPC_DISPLAY_ALL,
  56         RPC_DISPLAY_HEX_ADDR,
  57         RPC_DISPLAY_HEX_PORT,
  58         RPC_DISPLAY_UNIVERSAL_ADDR,
  59         RPC_DISPLAY_MAX,
  60 };
  61
  62 struct rpc_task;
  63 struct rpc_xprt;
  64 struct seq_file;
  65
  66 /*
  67  * This describes a complete RPC request
  68  */
  69 struct rpc_rqst {
  70         /*
  71          * This is the user-visible part
  72          */
  73         struct rpc_xprt *       rq_xprt;                /* RPC client */
  74         struct xdr_buf          rq_snd_buf;             /* send buffer */
  75         struct xdr_buf          rq_rcv_buf;             /* recv buffer */
  76
  77         /*
  78          * This is the private part
  79          */
  80         struct rpc_task *       rq_task;        /* RPC task data */
  81         __be32                  rq_xid;         /* request XID */
  82         int                     rq_cong;        /* has incremented xprt->cong */
  83         int                     rq_received;    /* receive completed */
  84         u32                     rq_seqno;       /* gss seq no. used on req. */
  85         int                     rq_enc_pages_num;
  86         struct page             **rq_enc_pages; /* scratch pages for use by
  87                                                    gss privacy code */
  88         void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
  89         struct list_head        rq_list;
  90
  91         __u32 *                 rq_buffer;      /* XDR encode buffer */
  92         size_t                  rq_bufsize,
  93                                 rq_callsize,
  94                                 rq_rcvsize;
  95
  96         struct xdr_buf          rq_private_buf;         /* The receive buffer
  97                                                          * used in the softirq.
  98                                                          */
  99         unsigned long           rq_majortimeo;  /* major timeout alarm */
 100         unsigned long           rq_timeout;     /* Current timeout value */
 101         unsigned int            rq_retries;     /* # of retries */
 102
 103         /*
 104          * Partial send handling
 105          */
 106         u32                     rq_bytes_sent;  /* Bytes we have sent */
 107
 108         unsigned long           rq_xtime;       /* when transmitted */
 109         int                     rq_ntrans;
 110 };
 111 #define rq_svec                 rq_snd_buf.head
 112 #define rq_slen                 rq_snd_buf.len
 113
 114 struct rpc_xprt_ops {
 115         void            (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
 116         int             (*reserve_xprt)(struct rpc_task *task);
 117         void            (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
 118         void            (*rpcbind)(struct rpc_task *task);
 119         void            (*set_port)(struct rpc_xprt *xprt, unsigned short port);
 120         void            (*connect)(struct rpc_task *task);
 121         void *          (*buf_alloc)(struct rpc_task *task, size_t size);
 122         void            (*buf_free)(void *buffer);
 123         int             (*send_request)(struct rpc_task *task);
 124         void            (*set_retrans_timeout)(struct rpc_task *task);
 125         void            (*timer)(struct rpc_task *task);
 126         void            (*release_request)(struct rpc_task *task);
 127         void            (*close)(struct rpc_xprt *xprt);
 128         void            (*destroy)(struct rpc_xprt *xprt);
 129         void            (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
 130 };
 131
 132 struct rpc_xprt {
 133         struct kref             kref;           /* Reference count */
 134         struct rpc_xprt_ops *   ops;            /* transport methods */
 135
 136         struct rpc_timeout      timeout;        /* timeout parms */
 137         struct sockaddr_storage addr;           /* server address */
 138         size_t                  addrlen;        /* size of server address */
 139         int                     prot;           /* IP protocol */
 140
 141         unsigned long           cong;           /* current congestion */
 142         unsigned long           cwnd;           /* congestion window */
 143
 144         size_t                  max_payload;    /* largest RPC payload size,
 145                                                    in bytes */
 146         unsigned int            tsh_size;       /* size of transport specific
 147                                                    header */
 148
 149         struct rpc_wait_queue   binding;        /* requests waiting on rpcbind */
 150         struct rpc_wait_queue   sending;        /* requests waiting to send */
 151         struct rpc_wait_queue   resend;         /* requests waiting to resend */
 152         struct rpc_wait_queue   pending;        /* requests in flight */
 153         struct rpc_wait_queue   backlog;        /* waiting for slot */
 154         struct list_head        free;           /* free slots */
 155         struct rpc_rqst *       slot;           /* slot table storage */
 156         unsigned int            max_reqs;       /* total slots */
 157         unsigned long           state;          /* transport state */
 158         unsigned char           shutdown   : 1, /* being shut down */
 159                                 resvport   : 1; /* use a reserved port */
 160         unsigned int            bind_index;     /* bind function index */
 161
 162         /*
 163          * Connection of transports
 164          */
 165         unsigned long           connect_timeout,
 166                                 bind_timeout,
 167                                 reestablish_timeout;
 168
 169         /*
 170          * Disconnection of idle transports
 171          */
 172         struct work_struct      task_cleanup;
 173         struct timer_list       timer;
 174         unsigned long           last_used,
 175                                 idle_timeout;
 176
 177         /*
 178          * Send stuff
 179          */
 180         spinlock_t              transport_lock; /* lock transport info */
 181         spinlock_t              reserve_lock;   /* lock slot table */
 182         u32                     xid;            /* Next XID value to use */
 183         struct rpc_task *       snd_task;       /* Task blocked in send */
 184         struct list_head        recv;
 185
 186         struct {
 187                 unsigned long           bind_count,     /* total number of binds */
 188                                         connect_count,  /* total number of connects */
 189                                         connect_start,  /* connect start timestamp */
 190                                         connect_time,   /* jiffies waiting for connect */
 191                                         sends,          /* how many complete requests */
 192                                         recvs,          /* how many complete requests */
 193                                         bad_xids;       /* lookup_rqst didn't find XID */
 194
 195                 unsigned long long      req_u,          /* average requests on the wire */
 196                                         bklog_u;        /* backlog queue utilization */
 197         } stat;
 198
 199         char *                  address_strings[RPC_DISPLAY_MAX];
 200 };
 201
 202 struct rpc_xprtsock_create {
 203         int                     proto;          /* IPPROTO_UDP or IPPROTO_TCP */
 204         struct sockaddr *       srcaddr;        /* optional local address */
 205         struct sockaddr *       dstaddr;        /* remote peer address */
 206         size_t                  addrlen;
 207         struct rpc_timeout *    timeout;        /* optional timeout parameters */
 208 };
 209
 210 /*
 211  * Transport operations used by ULPs
 212  */
 213 void                    xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);
 214
 215 /*
 216  * Generic internal transport functions
 217  */
 218 struct rpc_xprt *       xprt_create_transport(struct rpc_xprtsock_create *args);
 219 void                    xprt_connect(struct rpc_task *task);
 220 void                    xprt_reserve(struct rpc_task *task);
 221 int                     xprt_reserve_xprt(struct rpc_task *task);
 222 int                     xprt_reserve_xprt_cong(struct rpc_task *task);
 223 int                     xprt_prepare_transmit(struct rpc_task *task);
 224 void                    xprt_transmit(struct rpc_task *task);
 225 void                    xprt_end_transmit(struct rpc_task *task);
 226 int                     xprt_adjust_timeout(struct rpc_rqst *req);
 227 void                    xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
 228 void                    xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 229 void                    xprt_release(struct rpc_task *task);
 230 struct rpc_xprt *       xprt_get(struct rpc_xprt *xprt);
 231 void                    xprt_put(struct rpc_xprt *xprt);
 232
 233 static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
 234 {
 235         return p + xprt->tsh_size;
 236 }
 237
 238 /*
 239  * Transport switch helper functions
 240  */
 241 void                    xprt_set_retrans_timeout_def(struct rpc_task *task);
 242 void                    xprt_set_retrans_timeout_rtt(struct rpc_task *task);
 243 void                    xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
 244 void                    xprt_wait_for_buffer_space(struct rpc_task *task);
 245 void                    xprt_write_space(struct rpc_xprt *xprt);
 246 void                    xprt_update_rtt(struct rpc_task *task);
 247 void                    xprt_adjust_cwnd(struct rpc_task *task, int result);
 248 struct rpc_rqst *       xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
 249 void                    xprt_complete_rqst(struct rpc_task *task, int copied);
 250 void                    xprt_release_rqst_cong(struct rpc_task *task);
 251 void                    xprt_disconnect(struct rpc_xprt *xprt);
 252
 253 /*
 254  * Socket transport setup operations
 255  */
 256 struct rpc_xprt *       xs_setup_udp(struct rpc_xprtsock_create *args);
 257 struct rpc_xprt *       xs_setup_tcp(struct rpc_xprtsock_create *args);
 258 int                     init_socket_xprt(void);
 259 void                    cleanup_socket_xprt(void);
 260
 261 /*
 262  * Reserved bit positions in xprt->state
 263  */
 264 #define XPRT_LOCKED             (0)
 265 #define XPRT_CONNECTED          (1)
 266 #define XPRT_CONNECTING         (2)
 267 #define XPRT_CLOSE_WAIT         (3)
 268 #define XPRT_BOUND              (4)
 269 #define XPRT_BINDING            (5)
 270
 271 static inline void xprt_set_connected(struct rpc_xprt *xprt)
 272 {
 273         set_bit(XPRT_CONNECTED, &xprt->state);
 274 }
 275
 276 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
 277 {
 278         clear_bit(XPRT_CONNECTED, &xprt->state);
 279 }
 280
 281 static inline int xprt_connected(struct rpc_xprt *xprt)
 282 {
 283         return test_bit(XPRT_CONNECTED, &xprt->state);
 284 }
 285
 286 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
 287 {
 288         return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
 289 }
 290
 291 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
 292 {
 293         return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
 294 }
 295
 296 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
 297 {
 298         smp_mb__before_clear_bit();
 299         clear_bit(XPRT_CONNECTING, &xprt->state);
 300         smp_mb__after_clear_bit();
 301 }
 302
 303 static inline int xprt_connecting(struct rpc_xprt *xprt)
 304 {
 305         return test_bit(XPRT_CONNECTING, &xprt->state);
 306 }
 307
 308 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
 309 {
 310         return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
 311 }
 312
 313 static inline void xprt_set_bound(struct rpc_xprt *xprt)
 314 {
 315         test_and_set_bit(XPRT_BOUND, &xprt->state);
 316 }
 317
 318 static inline int xprt_bound(struct rpc_xprt *xprt)
 319 {
 320         return test_bit(XPRT_BOUND, &xprt->state);
 321 }
 322
 323 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
 324 {
 325         clear_bit(XPRT_BOUND, &xprt->state);
 326 }
 327
 328 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
 329 {
 330         smp_mb__before_clear_bit();
 331         clear_bit(XPRT_BINDING, &xprt->state);
 332         smp_mb__after_clear_bit();
 333 }
 334
 335 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
 336 {
 337         return test_and_set_bit(XPRT_BINDING, &xprt->state);
 338 }
 339
 340 #endif /* __KERNEL__*/
 341
 342 #endif /* _LINUX_SUNRPC_XPRT_H */