src/rx/rx_globals.h

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /* RX:  Globals for internal use, basically */
  11
  12 #ifndef AFS_RX_GLOBALS_H
  13 #define AFS_RX_GLOBALS_H
  14
  15
  16 #ifdef  KERNEL
  17 #include "rx/rx.h"
  18 #else /* KERNEL */
  19 # include "rx.h"
  20 #endif /* KERNEL */
  21
  22 #ifndef GLOBALSINIT
  23 #define GLOBALSINIT(x)
  24 #define POSTAMBLE
  25 #if defined(AFS_NT40_ENV)
  26 #define RX_STATS_INTERLOCKED 1
  27 #if defined(AFS_PTHREAD_ENV)
  28 #define EXT __declspec(dllimport) extern
  29 #else /* AFS_PTHREAD_ENV */
  30 #define EXT extern
  31 #endif /* AFS_PTHREAD_ENV */
  32 #else /* AFS_NT40_ENV */
  33 #define EXT extern
  34 #endif /* AFS_NT40_ENV */
  35 #endif /* !GLOBALSINIT */
  36
  37 /* Basic socket for client requests; other sockets (for receiving server requests) are in the service structures */
  38 EXT osi_socket rx_socket;
  39
  40 /* The array of installed services.  Null terminated. */
  41 EXT struct rx_service *rx_services[RX_MAX_SERVICES + 1];
  42 #ifdef RX_ENABLE_LOCKS
  43 /* Protects nRequestsRunning as well as pool allocation variables. */
  44 EXT afs_kmutex_t rx_serverPool_lock;
  45 #endif /* RX_ENABLE_LOCKS */
  46
  47 /* Constant delay time before sending a hard ack if the receiver consumes
  48  * a packet while no delayed ack event is scheduled. Ensures that the
  49  * sender is able to advance its window when the receiver consumes a packet
  50  * after the sender has exhausted its transmit window.
  51  */
  52 EXT struct clock rx_hardAckDelay;
  53
  54 #if defined(RXDEBUG) || defined(AFS_NT40_ENV)
  55 /* Variable to allow introduction of network unreliability; exported from libafsrpc */
  56 EXT int rx_intentionallyDroppedPacketsPer100 GLOBALSINIT(0);    /* Dropped on Send */
  57 EXT int rx_intentionallyDroppedOnReadPer100  GLOBALSINIT(0);    /* Dropped on Read */
  58 #endif
  59
  60 /* extra packets to add to the quota */
  61 EXT int rx_extraQuota GLOBALSINIT(0);
  62 /* extra packets to alloc (2 * maxWindowSize by default) */
  63 EXT int rx_extraPackets GLOBALSINIT(256);
  64
  65 EXT int rx_stackSize GLOBALSINIT(RX_DEFAULT_STACK_SIZE);
  66
  67 /* Time until an unresponsive connection is declared dead */
  68 EXT int rx_connDeadTime GLOBALSINIT(12);
  69
  70 /* Set rx default connection dead time; set on both services and connections at creation time */
  71 #ifdef AFS_NT40_ENV
  72 void rx_SetRxDeadTime(int seconds);
  73 #else
  74 #define rx_SetRxDeadTime(seconds)   (rx_connDeadTime = (seconds))
  75 #endif
  76
  77 /* Time until we toss an idle connection */
  78 EXT int rx_idleConnectionTime GLOBALSINIT(700);
  79 /* Time until we toss a peer structure, after all connections using are gone */
  80 EXT int rx_idlePeerTime GLOBALSINIT(60);
  81
  82 /* The file server is temporarily salvaging */
  83 EXT int rx_tranquil GLOBALSINIT(0);
  84
  85 /* UDP rcv buffer size */
  86 EXT int rx_UdpBufSize GLOBALSINIT(64 * 1024);
  87 #ifdef AFS_NT40_ENV
  88 int   rx_GetMinUdpBufSize(void);
  89 void  rx_SetUdpBufSize(int x);
  90 #else
  91 #define rx_GetMinUdpBufSize()   (64*1024)
  92 #define rx_SetUdpBufSize(x)     (((x)>rx_GetMinUdpBufSize()) ? (rx_UdpBufSize = (x)):0)
  93 #endif
  94 /*
  95  * Variables to control RX overload management. When the number of calls
  96  * waiting for a thread exceed the threshold, new calls are aborted
  97  * with the busy error.
  98  */
  99 EXT int rx_BusyThreshold GLOBALSINIT(-1);       /* default is disabled */
 100 EXT int rx_BusyError GLOBALSINIT(-1);
 101
 102 /* These definitions should be in one place */
 103 #ifdef  AFS_SUN5_ENV
 104 #define RX_CBUF_TIME    180     /* Check for packet deficit */
 105 #define RX_REAP_TIME    90      /* Check for tossable connections every 90 seconds */
 106 #else
 107 #define RX_CBUF_TIME    120     /* Check for packet deficit */
 108 #define RX_REAP_TIME    60      /* Check for tossable connections every 60 seconds */
 109 #endif
 110
 111 #define RX_FAST_ACK_RATE 1      /* as of 3.4, ask for an ack every
 112                                  * other packet. */
 113
 114 EXT int rx_minPeerTimeout GLOBALSINIT(20);      /* in milliseconds */
 115 EXT int rx_minWindow GLOBALSINIT(1);
 116 EXT int rx_maxWindow GLOBALSINIT(RX_MAXACKS);   /* must ack what we receive */
 117 EXT int rx_initReceiveWindow GLOBALSINIT(16);   /* how much to accept */
 118 EXT int rx_maxReceiveWindow GLOBALSINIT(32);    /* how much to accept */
 119 EXT int rx_initSendWindow GLOBALSINIT(16);
 120 EXT int rx_maxSendWindow GLOBALSINIT(32);
 121 EXT int rx_nackThreshold GLOBALSINIT(3);        /* Number NACKS to trigger congestion recovery */
 122 EXT int rx_nDgramThreshold GLOBALSINIT(4);      /* Number of packets before increasing
 123                                                  * packets per datagram */
 124 #define RX_MAX_FRAGS 4
 125 EXT int rxi_nSendFrags GLOBALSINIT(RX_MAX_FRAGS);       /* max fragments in a datagram */
 126 EXT int rxi_nRecvFrags GLOBALSINIT(RX_MAX_FRAGS);
 127 EXT int rxi_OrphanFragSize GLOBALSINIT(512);
 128
 129 #define RX_MAX_DGRAM_PACKETS 6  /* max packets per jumbogram */
 130
 131 EXT int rxi_nDgramPackets GLOBALSINIT(RX_MAX_DGRAM_PACKETS);
 132 /* allow n packets between soft acks */
 133 EXT int rxi_SoftAckRate GLOBALSINIT(RX_FAST_ACK_RATE);
 134 /* consume n packets before sending hard ack, should be larger than above,
 135    but not absolutely necessary.  If it's smaller, than fast receivers will
 136    send a soft ack, immediately followed by a hard ack. */
 137 EXT int rxi_HardAckRate GLOBALSINIT(RX_FAST_ACK_RATE + 1);
 138
 139 EXT int rx_nPackets GLOBALSINIT(0);     /* preallocate packets with rx_extraPackets */
 140
 141 /*
 142  * pthreads thread-specific rx info support
 143  * the rx_ts_info_t struct is meant to support all kinds of
 144  * thread-specific rx data:
 145  *
 146  *  _FPQ member contains a thread-specific free packet queue
 147  */
 148 #ifdef AFS_PTHREAD_ENV
 149 EXT pthread_key_t rx_ts_info_key;
 150 typedef struct rx_ts_info_t {
 151     struct {
 152         struct opr_queue queue;
 153         int len;                /* local queue length */
 154         int delta;              /* number of new packets alloc'd locally since last sync w/ global queue */
 155
 156         /* FPQ stats */
 157         int checkin_ops;
 158         int checkin_xfer;
 159         int checkout_ops;
 160         int checkout_xfer;
 161         int gtol_ops;
 162         int gtol_xfer;
 163         int ltog_ops;
 164         int ltog_xfer;
 165         int lalloc_ops;
 166         int lalloc_xfer;
 167         int galloc_ops;
 168         int galloc_xfer;
 169     } _FPQ;
 170     struct rx_packet * local_special_packet;
 171 } rx_ts_info_t;
 172 EXT struct rx_ts_info_t * rx_ts_info_init(void);   /* init function for thread-specific data struct */
 173 #define RX_TS_INFO_GET(ts_info_p) \
 174     do { \
 175         ts_info_p = (struct rx_ts_info_t*)pthread_getspecific(rx_ts_info_key); \
 176         if (ts_info_p == NULL) { \
 177             opr_Verify((ts_info_p = rx_ts_info_init()) != NULL); \
 178         } \
 179     } while(0)
 180 #endif /* AFS_PTHREAD_ENV */
 181
 182
 183 /* List of free packets */
 184 /* in pthreads rx, free packet queue is now a two-tiered queueing system
 185  * in which the first tier is thread-specific, and the second tier is
 186  * a global free packet queue */
 187 EXT struct opr_queue rx_freePacketQueue;
 188 #ifdef RX_TRACK_PACKETS
 189 #define RX_FPQ_MARK_FREE(p) \
 190     do { \
 191         if ((p)->flags & RX_PKTFLAG_FREE) \
 192             osi_Panic("rx packet already free\n"); \
 193         (p)->flags |= RX_PKTFLAG_FREE; \
 194         (p)->flags &= ~(RX_PKTFLAG_TQ|RX_PKTFLAG_IOVQ|RX_PKTFLAG_RQ|RX_PKTFLAG_CP); \
 195         (p)->length = 0; \
 196         (p)->niovecs = 0; \
 197     } while(0)
 198 #define RX_FPQ_MARK_USED(p) \
 199     do { \
 200         if (!((p)->flags & RX_PKTFLAG_FREE)) \
 201             osi_Panic("rx packet not free\n"); \
 202         (p)->flags = 0;         /* clear RX_PKTFLAG_FREE, initialize the rest */ \
 203         (p)->header.flags = 0; \
 204     } while(0)
 205 #else
 206 #define RX_FPQ_MARK_FREE(p) \
 207     do { \
 208         (p)->length = 0; \
 209         (p)->niovecs = 0; \
 210     } while(0)
 211 #define RX_FPQ_MARK_USED(p) \
 212     do { \
 213         (p)->flags = 0;         /* clear RX_PKTFLAG_FREE, initialize the rest */ \
 214         (p)->header.flags = 0; \
 215     } while(0)
 216 #endif
 217 #define RX_PACKET_IOV_INIT(p) \
 218     do { \
 219         (p)->wirevec[0].iov_base = (char *)((p)->wirehead); \
 220         (p)->wirevec[0].iov_len = RX_HEADER_SIZE; \
 221         (p)->wirevec[1].iov_base = (char *)((p)->localdata); \
 222         (p)->wirevec[1].iov_len = RX_FIRSTBUFFERSIZE; \
 223     } while(0)
 224 #define RX_PACKET_IOV_FULLINIT(p) \
 225     do { \
 226         (p)->wirevec[0].iov_base = (char *)((p)->wirehead); \
 227         (p)->wirevec[0].iov_len = RX_HEADER_SIZE; \
 228         (p)->wirevec[1].iov_base = (char *)((p)->localdata); \
 229         (p)->wirevec[1].iov_len = RX_FIRSTBUFFERSIZE; \
 230         (p)->niovecs = 2; \
 231         (p)->length = RX_FIRSTBUFFERSIZE; \
 232     } while(0)
 233
 234 #ifdef RX_ENABLE_LOCKS
 235 EXT afs_kmutex_t rx_freePktQ_lock;
 236 #endif /* RX_ENABLE_LOCKS */
 237
 238 /*!
 239  * \brief Queue of allocated packets.
 240  *
 241  * This queue is used to keep track of the blocks of allocated packets.
 242  * This information is used when afs is being unmounted and the memory
 243  * used by those packets needs to be released.
 244  */
 245 EXT struct opr_queue rx_mallocedPacketQueue;
 246 #ifdef RX_ENABLE_LOCKS
 247 EXT afs_kmutex_t rx_mallocedPktQ_lock;
 248 #endif /* RX_ENABLE_LOCKS */
 249
 250 #if defined(AFS_PTHREAD_ENV) && !defined(KERNEL)
 251 #define RX_ENABLE_TSFPQ
 252 EXT int rx_TSFPQGlobSize GLOBALSINIT(3); /* number of packets to transfer between global and local queues in one op */
 253 EXT int rx_TSFPQLocalMax GLOBALSINIT(15); /* max number of packets on local FPQ before returning a glob to the global pool */
 254 EXT int rx_TSFPQMaxProcs GLOBALSINIT(0); /* max number of threads expected */
 255 #define RX_TS_FPQ_FLUSH_GLOBAL 1
 256 #define RX_TS_FPQ_PULL_GLOBAL 1
 257 #define RX_TS_FPQ_ALLOW_OVERCOMMIT 1
 258 /*
 259  * compute the localmax and globsize values from rx_TSFPQMaxProcs and rx_nPackets.
 260  * arbitarily set local max so that all threads consume 90% of packets, if all local queues are full.
 261  * arbitarily set transfer glob size to 20% of max local packet queue length.
 262  * also set minimum values of 15 and 3.  Given the algorithms, the number of buffers allocated
 263  * by each call to AllocPacketBufs() will increase indefinitely without a cap on the transfer
 264  * glob size.  A cap of 64 is selected because that will produce an allocation of greater than
 265  * three times that amount which is greater than half of ncalls * maxReceiveWindow.
 266  * Must be called under rx_packets_mutex.
 267  */
 268 #define RX_TS_FPQ_COMPUTE_LIMITS \
 269     do { \
 270         int newmax, newglob; \
 271         newmax = (rx_nPackets * 9) / (10 * rx_TSFPQMaxProcs); \
 272         newmax = (newmax >= 15) ? newmax : 15; \
 273         newglob = newmax / 5; \
 274         newglob = (newglob >= 3) ? (newglob < 64 ? newglob : 64) : 3; \
 275         rx_TSFPQLocalMax = newmax; \
 276         rx_TSFPQGlobSize = newglob; \
 277     } while(0)
 278 /* record the number of packets allocated by this thread
 279  * and stored in the thread local queue */
 280 #define RX_TS_FPQ_LOCAL_ALLOC(rx_ts_info_p,num_alloc) \
 281     do { \
 282         (rx_ts_info_p)->_FPQ.lalloc_ops++; \
 283         (rx_ts_info_p)->_FPQ.lalloc_xfer += num_alloc; \
 284     } while (0)
 285 /* record the number of packets allocated by this thread
 286  * and stored in the global queue */
 287 #define RX_TS_FPQ_GLOBAL_ALLOC(rx_ts_info_p,num_alloc) \
 288     do { \
 289         (rx_ts_info_p)->_FPQ.galloc_ops++; \
 290         (rx_ts_info_p)->_FPQ.galloc_xfer += num_alloc; \
 291     } while (0)
 292 /* move packets from local (thread-specific) to global free packet queue.
 293    rx_freePktQ_lock must be held. default is to reduce the queue size to 40% ofmax */
 294 #define RX_TS_FPQ_LTOG(rx_ts_info_p) \
 295     do { \
 296         int i; \
 297         struct rx_packet * p; \
 298         int tsize = MIN((rx_ts_info_p)->_FPQ.len, (rx_ts_info_p)->_FPQ.len - rx_TSFPQLocalMax + 3 *  rx_TSFPQGlobSize); \
 299         if (tsize <= 0) break; \
 300         for (i=0,p=opr_queue_Last(&((rx_ts_info_p)->_FPQ.queue), \
 301                                  struct rx_packet, entry); \
 302              i < tsize; i++,p=opr_queue_Prev(&p->entry, \
 303                                             struct rx_packet, entry )); \
 304         opr_queue_SplitAfterPrepend(&((rx_ts_info_p)->_FPQ.queue), \
 305                                    &rx_freePacketQueue, &p->entry); \
 306         (rx_ts_info_p)->_FPQ.len -= tsize; \
 307         rx_nFreePackets += tsize; \
 308         (rx_ts_info_p)->_FPQ.ltog_ops++; \
 309         (rx_ts_info_p)->_FPQ.ltog_xfer += tsize; \
 310         if ((rx_ts_info_p)->_FPQ.delta) { \
 311             MUTEX_ENTER(&rx_packets_mutex); \
 312             RX_TS_FPQ_COMPUTE_LIMITS; \
 313             MUTEX_EXIT(&rx_packets_mutex); \
 314            (rx_ts_info_p)->_FPQ.delta = 0; \
 315         } \
 316     } while(0)
 317 /* same as above, except user has direct control over number to transfer */
 318 #define RX_TS_FPQ_LTOG2(rx_ts_info_p,num_transfer) \
 319     do { \
 320         int i; \
 321         struct rx_packet * p; \
 322         if (num_transfer <= 0) break; \
 323         for (i=0,p=opr_queue_Last(&((rx_ts_info_p)->_FPQ.queue), \
 324                                  struct rx_packet, entry ); \
 325              i < (num_transfer); \
 326              i++,p=opr_queue_Prev(&p->entry, struct rx_packet, entry )); \
 327         opr_queue_SplitAfterPrepend(&((rx_ts_info_p)->_FPQ.queue), \
 328                                    &rx_freePacketQueue, &p->entry); \
 329         (rx_ts_info_p)->_FPQ.len -= (num_transfer); \
 330         rx_nFreePackets += (num_transfer); \
 331         (rx_ts_info_p)->_FPQ.ltog_ops++; \
 332         (rx_ts_info_p)->_FPQ.ltog_xfer += (num_transfer); \
 333         if ((rx_ts_info_p)->_FPQ.delta) { \
 334             MUTEX_ENTER(&rx_packets_mutex); \
 335             RX_TS_FPQ_COMPUTE_LIMITS; \
 336             MUTEX_EXIT(&rx_packets_mutex); \
 337             (rx_ts_info_p)->_FPQ.delta = 0; \
 338         } \
 339     } while(0)
 340 /* move packets from global to local (thread-specific) free packet queue.
 341    rx_freePktQ_lock must be held. */
 342 #define RX_TS_FPQ_GTOL(rx_ts_info_p) \
 343     do { \
 344         int i, tsize; \
 345         struct rx_packet * p; \
 346         tsize = (rx_TSFPQGlobSize <= rx_nFreePackets) ? \
 347                  rx_TSFPQGlobSize : rx_nFreePackets; \
 348         for (i=0, \
 349                p=opr_queue_First(&rx_freePacketQueue, struct rx_packet, entry); \
 350              i < tsize; \
 351              i++,p=opr_queue_Next(&p->entry, struct rx_packet, entry)); \
 352         opr_queue_SplitBeforeAppend(&rx_freePacketQueue, \
 353                                    &((rx_ts_info_p)->_FPQ.queue), &p->entry); \
 354         (rx_ts_info_p)->_FPQ.len += i; \
 355         rx_nFreePackets -= i; \
 356         (rx_ts_info_p)->_FPQ.gtol_ops++; \
 357         (rx_ts_info_p)->_FPQ.gtol_xfer += i; \
 358     } while(0)
 359 /* same as above, except user has direct control over number to transfer */
 360 #define RX_TS_FPQ_GTOL2(rx_ts_info_p,num_transfer) \
 361     do { \
 362         int i, tsize; \
 363         struct rx_packet * p; \
 364         tsize = (num_transfer); \
 365         if (tsize > rx_nFreePackets) tsize = rx_nFreePackets; \
 366         for (i=0, \
 367                p=opr_queue_First(&rx_freePacketQueue, struct rx_packet, entry); \
 368              i < tsize; \
 369              i++, p=opr_queue_Next(&p->entry, struct rx_packet, entry)); \
 370         opr_queue_SplitBeforeAppend(&rx_freePacketQueue, \
 371                                    &((rx_ts_info_p)->_FPQ.queue), &p->entry); \
 372         (rx_ts_info_p)->_FPQ.len += i; \
 373         rx_nFreePackets -= i; \
 374         (rx_ts_info_p)->_FPQ.gtol_ops++; \
 375         (rx_ts_info_p)->_FPQ.gtol_xfer += i; \
 376     } while(0)
 377 /* checkout a packet from the thread-specific free packet queue */
 378 #define RX_TS_FPQ_CHECKOUT(rx_ts_info_p,p) \
 379     do { \
 380         (p) = opr_queue_First(&((rx_ts_info_p)->_FPQ.queue), \
 381                              struct rx_packet, entry); \
 382         opr_queue_Remove(&p->entry); \
 383         RX_FPQ_MARK_USED(p); \
 384         (rx_ts_info_p)->_FPQ.len--; \
 385         (rx_ts_info_p)->_FPQ.checkout_ops++; \
 386         (rx_ts_info_p)->_FPQ.checkout_xfer++; \
 387     } while(0)
 388 /* checkout multiple packets from the thread-specific free packet queue.
 389  * num_transfer must be a variable.
 390  */
 391 #define RX_TS_FPQ_QCHECKOUT(rx_ts_info_p,num_transfer,q) \
 392     do { \
 393         int i; \
 394         struct rx_packet *p; \
 395         if (num_transfer > (rx_ts_info_p)->_FPQ.len) num_transfer = (rx_ts_info_p)->_FPQ.len; \
 396         for (i=0, p=opr_queue_First(&((rx_ts_info_p)->_FPQ.queue), \
 397                                    struct rx_packet, entry); \
 398              i < num_transfer; \
 399              i++, p=opr_queue_Next(&p->entry, struct rx_packet, entry)) { \
 400             RX_FPQ_MARK_USED(p); \
 401         } \
 402         opr_queue_SplitBeforeAppend(&((rx_ts_info_p)->_FPQ.queue),(q), \
 403                                    &((p)->entry)); \
 404         (rx_ts_info_p)->_FPQ.len -= num_transfer; \
 405         (rx_ts_info_p)->_FPQ.checkout_ops++; \
 406         (rx_ts_info_p)->_FPQ.checkout_xfer += num_transfer; \
 407     } while(0)
 408 /* check a packet into the thread-specific free packet queue */
 409 #define RX_TS_FPQ_CHECKIN(rx_ts_info_p,p) \
 410     do { \
 411         opr_queue_Prepend(&((rx_ts_info_p)->_FPQ.queue), &((p)->entry)); \
 412         RX_FPQ_MARK_FREE(p); \
 413         (rx_ts_info_p)->_FPQ.len++; \
 414         (rx_ts_info_p)->_FPQ.checkin_ops++; \
 415         (rx_ts_info_p)->_FPQ.checkin_xfer++; \
 416     } while(0)
 417 /* check multiple packets into the thread-specific free packet queue */
 418 /* num_transfer must equal length of (q); it is not a means of checking
 419  * in part of (q).  passing num_transfer just saves us instructions
 420  * since caller already knows length of (q) for other reasons */
 421 #define RX_TS_FPQ_QCHECKIN(rx_ts_info_p,num_transfer,q) \
 422     do { \
 423         struct opr_queue *cur; \
 424         for (opr_queue_Scan((q), cur)) { \
 425             RX_FPQ_MARK_FREE(opr_queue_Entry(cur, struct rx_packet, entry)); \
 426         } \
 427         opr_queue_SplicePrepend(&((rx_ts_info_p)->_FPQ.queue),(q)); \
 428         (rx_ts_info_p)->_FPQ.len += (num_transfer); \
 429         (rx_ts_info_p)->_FPQ.checkin_ops++; \
 430         (rx_ts_info_p)->_FPQ.checkin_xfer += (num_transfer); \
 431     } while(0)
 432 #endif /* AFS_PTHREAD_ENV && !KERNEL */
 433
 434 /* Number of free packets */
 435 EXT int rx_nFreePackets GLOBALSINIT(0);
 436 EXT int rxi_NeedMorePackets GLOBALSINIT(0);
 437 EXT int rx_packetReclaims GLOBALSINIT(0);
 438
 439 /* largest packet which we can safely receive, initialized to AFS 3.2 value
 440  * This is provided for backward compatibility with peers which may be unable
 441  * to swallow anything larger. THIS MUST NEVER DECREASE WHILE AN APPLICATION
 442  * IS RUNNING! */
 443 EXT afs_uint32 rx_maxReceiveSize GLOBALSINIT(_OLD_MAX_PACKET_SIZE * RX_MAX_FRAGS +
 444                                       UDP_HDR_SIZE * (RX_MAX_FRAGS - 1));
 445
 446 /* this is the maximum packet size that the user wants us to receive */
 447 /* this is set by rxTune if required */
 448 EXT afs_uint32 rx_maxReceiveSizeUser GLOBALSINIT(0xffffffff);
 449
 450 /* rx_MyMaxSendSize is the size of the largest packet we will send,
 451  * including the RX header. Just as rx_maxReceiveSize is the
 452  * max we will receive, including the rx header.
 453  */
 454 EXT afs_uint32 rx_MyMaxSendSize GLOBALSINIT(8588);
 455
 456 /* Maximum size of a jumbo datagram we can receive */
 457 EXT afs_uint32 rx_maxJumboRecvSize GLOBALSINIT(RX_MAX_PACKET_SIZE);
 458
 459 /* need this to permit progs to run on AIX systems */
 460 EXT int (*rxi_syscallp) (afs_uint32 a3, afs_uint32 a4, void *a5)GLOBALSINIT(0);
 461
 462 /* List of free queue entries */
 463 EXT struct rx_serverQueueEntry *rx_FreeSQEList GLOBALSINIT(0);
 464 #ifdef  RX_ENABLE_LOCKS
 465 EXT afs_kmutex_t freeSQEList_lock;
 466 #endif
 467
 468 /* List of free call structures */
 469 EXT struct opr_queue rx_freeCallQueue;
 470 #ifdef  RX_ENABLE_LOCKS
 471 EXT afs_kmutex_t rx_freeCallQueue_lock;
 472 #endif
 473 EXT afs_int32 rxi_nCalls GLOBALSINIT(0);
 474
 475 /* Port requested at rx_Init.  If this is zero, the actual port used will be different--but it will only be used for client operations.  If non-zero, server provided services may use the same port. */
 476 EXT u_short rx_port;
 477
 478 #if !defined(KERNEL) && !defined(AFS_PTHREAD_ENV)
 479 /* 32-bit select Mask for rx_Listener. */
 480 EXT fd_set rx_selectMask;
 481 EXT osi_socket rx_maxSocketNumber;      /* Maximum socket number in the select mask. */
 482 /* Minumum socket number in the select mask. */
 483 EXT osi_socket rx_minSocketNumber GLOBALSINIT(0x7fffffff);
 484 #endif
 485
 486 /* This is actually the minimum number of packets that must remain free,
 487     overall, immediately after a packet of the requested class has been
 488     allocated.  *WARNING* These must be assigned with a great deal of care.
 489     In order, these are receive quota, send quota, special quota, receive
 490     continuation quota, and send continuation quota. */
 491 #define RX_PACKET_QUOTAS {1, 10, 0, 1, 10}
 492 /* value large enough to guarantee that no allocation fails due to RX_PACKET_QUOTAS.
 493    Make it a little bigger, just for fun */
 494 #define RX_MAX_QUOTA    15      /* part of min packet computation */
 495 EXT int rx_packetQuota[RX_N_PACKET_CLASSES] GLOBALSINIT(RX_PACKET_QUOTAS);
 496 EXT int meltdown_1pkt GLOBALSINIT(1);   /* prefer to schedule single-packet calls */
 497 EXT int rxi_md2cnt GLOBALSINIT(0);      /* counter of skipped calls */
 498 EXT int rxi_2dchoice GLOBALSINIT(1);    /* keep track of another call to schedule */
 499
 500 /* quota system: each attached server process must be able to make
 501     progress to avoid system deadlock, so we ensure that we can always
 502     handle the arrival of the next unacknowledged data packet for an
 503     attached call.  rxi_dataQuota gives the max # of packets that must be
 504     reserved for active calls for them to be able to make progress, which is
 505     essentially enough to queue up a window-full of packets (the first packet
 506     may be missing, so these may not get read) + the # of packets the thread
 507     may use before reading all of its input (# free must be one more than send
 508     packet quota).  Thus, each thread allocates rx_maxReceiveWindow+1 (max
 509     queued packets) + an extra for sending data.  The system also reserves
 510     RX_MAX_QUOTA (must be more than RX_PACKET_QUOTA[i], which is 10), so that
 511     the extra packet can be sent (must be under the system-wide send packet
 512     quota to send any packets) */
 513 /* # to reserve so that thread with input can still make calls (send packets)
 514    without blocking */
 515 EXT int rxi_dataQuota GLOBALSINIT(RX_MAX_QUOTA);        /* packets to reserve for active threads */
 516
 517 EXT afs_int32 rxi_availProcs GLOBALSINIT(0);    /* number of threads in the pool */
 518 EXT afs_int32 rxi_totalMin GLOBALSINIT(0);      /* Sum(minProcs) forall services */
 519 EXT afs_int32 rxi_minDeficit GLOBALSINIT(0);    /* number of procs needed to handle all minProcs */
 520
 521 EXT afs_uint32 rx_nextCid;              /* Next connection call id */
 522 EXT afs_uint32 rx_epoch;                /* Initialization time of rx */
 523 #ifdef  RX_ENABLE_LOCKS
 524 EXT afs_kcondvar_t rx_waitingForPackets_cv;
 525 #endif
 526 EXT char rx_waitingForPackets;  /* Processes set and wait on this variable when waiting for packet buffers */
 527
 528 EXT struct rx_peer **rx_peerHashTable;
 529 EXT struct rx_connection **rx_connHashTable;
 530 EXT struct rx_connection *rx_connCleanup_list GLOBALSINIT(0);
 531 EXT afs_uint32 rx_hashTableSize GLOBALSINIT(257);       /* Prime number */
 532 #ifdef RX_ENABLE_LOCKS
 533 EXT afs_kmutex_t rx_peerHashTable_lock;
 534 EXT afs_kmutex_t rx_connHashTable_lock;
 535 #endif /* RX_ENABLE_LOCKS */
 536
 537 #define CONN_HASH(host, port, cid, epoch, type) ((((cid)>>RX_CIDSHIFT)%rx_hashTableSize))
 538
 539 #define PEER_HASH(host, port)  ((host ^ port) % rx_hashTableSize)
 540
 541 /* Forward definitions of internal procedures */
 542
 543 #define rxi_AllocSecurityObject() rxi_Alloc(sizeof(struct rx_securityClass))
 544 #define rxi_FreeSecurityObject(obj) rxi_Free(obj, sizeof(struct rx_securityClass))
 545 #define rxi_AllocService()      rxi_Alloc(sizeof(struct rx_service))
 546 #define rxi_FreeService(obj) \
 547 do { \
 548     MUTEX_DESTROY(&(obj)->svc_data_lock);  \
 549     rxi_Free((obj), sizeof(struct rx_service)); \
 550 } while (0)
 551 #define rxi_AllocPeer()         rxi_Alloc(sizeof(struct rx_peer))
 552 #define rxi_FreePeer(peer)      rxi_Free(peer, sizeof(struct rx_peer))
 553 #define rxi_AllocConnection()   rxi_Alloc(sizeof(struct rx_connection))
 554 #define rxi_FreeConnection(conn) (rxi_Free(conn, sizeof(struct rx_connection)))
 555
 556 EXT afs_int32 rx_stats_active GLOBALSINIT(1);   /* boolean - rx statistics gathering */
 557
 558 #ifndef KERNEL
 559 /* Some debugging stuff */
 560 EXT FILE *rx_debugFile;         /* Set by the user to a stdio file for debugging output */
 561 EXT FILE *rxevent_debugFile;    /* Set to an stdio descriptor for event logging to that file */
 562 #endif
 563
 564 #ifdef RXDEBUG
 565 # define rx_Log rx_debugFile
 566 # ifdef AFS_NT40_ENV
 567 EXT int rxdebug_active;
 568 #  define dpf(args) do { if (rxdebug_active) rxi_DebugPrint args; } while (0)
 569 # else
 570 #  ifdef DPF_FSLOG
 571 #   include <afs/afsutil.h>
 572 #   define dpf(args) FSLog args
 573 #  else
 574 #   define dpf(args) do { if (rx_debugFile) rxi_DebugPrint args; } while (0)
 575 #  endif
 576 # endif
 577 # define rx_Log_event rxevent_debugFile
 578 #else
 579 # define dpf(args)
 580 #endif /* RXDEBUG */
 581
 582 EXT char *rx_packetTypes[RX_N_PACKET_TYPES] GLOBALSINIT(RX_PACKET_TYPES);       /* Strings defined in rx.h */
 583
 584 #ifndef KERNEL
 585 /*
 586  * Counter used to implement connection specific data
 587  */
 588 EXT int rxi_keyCreate_counter GLOBALSINIT(0);
 589 /*
 590  * Array of function pointers used to destory connection specific data
 591  */
 592 EXT rx_destructor_t *rxi_keyCreate_destructor GLOBALSINIT(NULL);
 593 #ifdef RX_ENABLE_LOCKS
 594 EXT afs_kmutex_t rxi_keyCreate_lock;
 595 #endif /* RX_ENABLE_LOCKS */
 596 #endif /* !KERNEL */
 597
 598 /*
 599  * SERVER ONLY: Threshholds used to throttle error replies to looping
 600  * clients. When consecutive calls are aborting with the same error, the
 601  * server throttles the client by waiting before sending error messages.
 602  * Disabled if abort thresholds are zero.
 603  */
 604 EXT int rxi_connAbortThreshhold GLOBALSINIT(0);
 605 EXT int rxi_connAbortDelay GLOBALSINIT(3000);
 606 EXT int rxi_callAbortThreshhold GLOBALSINIT(0);
 607 EXT int rxi_callAbortDelay GLOBALSINIT(3000);
 608
 609 /*
 610  * Thread specific thread ID used to implement LWP_Index().
 611  */
 612
 613 #if defined(AFS_PTHREAD_ENV)
 614 EXT int rxi_fcfs_thread_num GLOBALSINIT(0);
 615 EXT pthread_key_t rx_thread_id_key;
 616 #else
 617 #define rxi_fcfs_thread_num (0)
 618 #endif
 619
 620 #if defined(RX_ENABLE_LOCKS)
 621 EXT afs_kmutex_t rx_waiting_mutex POSTAMBLE;    /* used to protect waiting counters */
 622 EXT afs_kmutex_t rx_quota_mutex POSTAMBLE;      /* used to protect quota counters */
 623 EXT afs_kmutex_t rx_pthread_mutex POSTAMBLE;    /* used to protect pthread counters */
 624 EXT afs_kmutex_t rx_packets_mutex POSTAMBLE;    /* used to protect packet counters */
 625 EXT afs_kmutex_t rx_refcnt_mutex POSTAMBLE;       /* used to protect conn/call ref counts */
 626 #endif
 627
 628 EXT int rx_enable_stats GLOBALSINIT(0);
 629
 630 /*
 631  * Set this flag to enable the listener thread to trade places with an idle
 632  * worker thread to move the context switch from listener to worker out of
 633  * the request path.
 634  */
 635 EXT int rx_enable_hot_thread GLOBALSINIT(0);
 636
 637 EXT int RX_IPUDP_SIZE GLOBALSINIT(_RX_IPUDP_SIZE);
 638 #endif /* AFS_RX_GLOBALS_H */