lnet/klnds/iiblnd/iiblnd.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/klnds/iiblnd/iiblnd.h
  37  *
  38  * Author: Eric Barton <eric@bartonsoftware.com>
  39  */
  40
  41 #ifndef EXPORT_SYMTAB
  42 # define EXPORT_SYMTAB
  43 #endif
  44 #ifndef AUTOCONF_INCLUDED
  45 #include <linux/config.h>
  46 #endif
  47 #include <linux/module.h>
  48 #include <linux/kernel.h>
  49 #include <linux/mm.h>
  50 #include <linux/string.h>
  51 #include <linux/stat.h>
  52 #include <linux/errno.h>
  53 #include <linux/smp_lock.h>
  54 #include <linux/unistd.h>
  55 #include <linux/uio.h>
  56
  57 #include <asm/system.h>
  58 #include <asm/uaccess.h>
  59 #include <asm/io.h>
  60
  61 #include <linux/init.h>
  62 #include <linux/fs.h>
  63 #include <linux/file.h>
  64 #include <linux/stat.h>
  65 #include <linux/list.h>
  66 #include <linux/kmod.h>
  67 #include <linux/sysctl.h>
  68
  69 #define DEBUG_SUBSYSTEM S_LND
  70
  71 #include <libcfs/libcfs.h>
  72 #include <lnet/lnet.h>
  73 #include <lnet/lib-lnet.h>
  74
  75 #include <linux/iba/ibt.h>
  76
  77 #define GCC_VERSION (__GNUC__ * 10000 \
  78                 + __GNUC_MINOR__ * 100 \
  79                 + __GNUC_PATCHLEVEL__)
  80
  81 /* Test for GCC > 3.2.2 */
  82 #if GCC_VERSION <= 30202
  83 /* GCC 3.2.2, and presumably several versions before it, will
  84  * miscompile this driver. See
  85  * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9853. */
  86 #error Invalid GCC version. Must use GCC >= 3.2.3
  87 #endif
  88
  89 #ifdef CONFIG_SMP
  90 # define IBNAL_N_SCHED      num_online_cpus()   /* # schedulers */
  91 #else
  92 # define IBNAL_N_SCHED      1                   /* # schedulers */
  93 #endif
  94
  95 #define IBNAL_USE_FMR                0          /* map on demand v. use whole mem mapping */
  96 #define KIBLND_DETAILED_DEBUG        0
  97
  98 /* tunables fixed at compile time */
  99 #define IBNAL_PEER_HASH_SIZE         101        /* # peer lists */
 100 #define IBNAL_RESCHED                100        /* # scheduler loops before reschedule */
 101 #define IBNAL_MSG_QUEUE_SIZE         8          /* # messages/RDMAs in-flight */
 102 #define IBNAL_CREDIT_HIGHWATER       7          /* when to eagerly return credits */
 103 #define IBNAL_MSG_SIZE              (4<<10)     /* max size of queued messages (inc hdr) */
 104 #define IBNAL_RDMA_BASE              0x0eeb0000
 105 #define IBNAL_STARTING_PSN           1
 106
 107 /* QP tunables */
 108 /* 7 indicates infinite retry attempts, Infinicon recommended 5 */
 109 #define IBNAL_RETRY                  5          /* # times to retry */
 110 #define IBNAL_RNR_RETRY              5          /*  */
 111 #define IBNAL_CM_RETRY               5          /* # times to retry connection */
 112 #define IBNAL_FLOW_CONTROL           1
 113 #define IBNAL_ACK_TIMEOUT            20         /* supposedly 4 secs */
 114 #define IBNAL_EE_FLOW                1
 115 #define IBNAL_LOCAL_SUB              1
 116 #define IBNAL_FAILOVER_ACCEPTED      0
 117
 118 /************************/
 119 /* derived constants... */
 120
 121 /* TX messages (shared by all connections) */
 122 #define IBNAL_TX_MSGS()       (*kibnal_tunables.kib_ntx)
 123 #define IBNAL_TX_MSG_BYTES()  (IBNAL_TX_MSGS() * IBNAL_MSG_SIZE)
 124 #define IBNAL_TX_MSG_PAGES()  ((IBNAL_TX_MSG_BYTES() + PAGE_SIZE - 1)/PAGE_SIZE)
 125
 126 #if IBNAL_USE_FMR
 127 # define IBNAL_MAX_RDMA_FRAGS 1
 128 # define IBNAL_CONCURRENT_SENDS IBNAL_RX_MSGS
 129 #else
 130 # define IBNAL_MAX_RDMA_FRAGS LNET_MAX_IOV
 131 # define IBNAL_CONCURRENT_SENDS IBNAL_MSG_QUEUE_SIZE
 132 #endif
 133
 134 /* RX messages (per connection) */
 135 #define IBNAL_RX_MSGS         (IBNAL_MSG_QUEUE_SIZE * 2)
 136 #define IBNAL_RX_MSG_BYTES    (IBNAL_RX_MSGS * IBNAL_MSG_SIZE)
 137 #define IBNAL_RX_MSG_PAGES    ((IBNAL_RX_MSG_BYTES + PAGE_SIZE - 1)/PAGE_SIZE)
 138
 139 #define IBNAL_CQ_ENTRIES()  (IBNAL_TX_MSGS() * (1 + IBNAL_MAX_RDMA_FRAGS) +             \
 140                              (IBNAL_RX_MSGS * *kibnal_tunables.kib_concurrent_peers))
 141
 142 typedef struct
 143 {
 144         char            **kib_hca_basename;     /* HCA base name */
 145         char            **kib_ipif_basename;    /* IPoIB interface base name */
 146         char            **kib_service_name;     /* global service name */
 147         unsigned int     *kib_service_number;   /* global service number */
 148         int              *kib_min_reconnect_interval; /* min connect retry seconds... */
 149         int              *kib_max_reconnect_interval; /* max connect retry seconds */
 150         int              *kib_concurrent_peers; /* max # peers */
 151         int              *kib_cksum;            /* checksum kib_msg_t? */
 152         int              *kib_timeout;          /* comms timeout (seconds) */
 153         int              *kib_keepalive;        /* keepalive timeout (seconds) */
 154         int              *kib_ntx;              /* # tx descs */
 155         int              *kib_credits;          /* # concurrent sends */
 156         int              *kib_peercredits;      /* # concurrent sends to 1 peer */
 157         int              *kib_sd_retries;       /* # concurrent sends to 1 peer */
 158         int              *kib_concurrent_sends; /* send work queue sizing */
 159 #if defined(CONFIG_SYSCTL) && !CFS_SYSFS_MODULE_PARM
 160         cfs_sysctl_table_header_t *kib_sysctl;  /* sysctl interface */
 161 #endif
 162 } kib_tunables_t;
 163
 164 /* NB The Infinicon stack has specific typedefs for some things
 165  * (e.g. IB_{L,R}_KEY), that just map back to __u32 etc */
 166 typedef struct
 167 {
 168         int               ibp_npages;           /* # pages */
 169         struct page      *ibp_pages[0];
 170 } kib_pages_t;
 171
 172 typedef struct
 173 {
 174         IB_HANDLE         md_handle;
 175         __u32             md_lkey;
 176         __u32             md_rkey;
 177         __u64             md_addr;
 178 } kib_md_t;
 179
 180 typedef struct
 181 {
 182         int               kib_init;             /* initialisation state */
 183         __u64             kib_incarnation;      /* which one am I */
 184         int               kib_shutdown;         /* shut down? */
 185         atomic_t          kib_nthreads;         /* # live threads */
 186         lnet_ni_t        *kib_ni;               /* _the_ iib instance */
 187
 188         __u64             kib_port_guid;        /* my GUID (lo 64 of GID)*/
 189         __u16             kib_port_pkey;        /* my pkey, whatever that is */
 190         struct semaphore  kib_listener_signal;  /* signal completion */
 191         IB_HANDLE         kib_listener_cep;     /* connection end point */
 192
 193         rwlock_t          kib_global_lock;      /* stabilize peer/conn ops */
 194         int               kib_ready;            /* CQ callback fired */
 195         int               kib_checking_cq;      /* a scheduler is checking the CQ */
 196
 197         struct list_head *kib_peers;            /* hash table of all my known peers */
 198         int               kib_peer_hash_size;   /* size of kib_peers */
 199         atomic_t          kib_npeers;           /* # peers extant */
 200         atomic_t          kib_nconns;           /* # connections extant */
 201
 202         struct list_head  kib_connd_zombies;    /* connections to free */
 203         struct list_head  kib_connd_conns;      /* connections to progress */
 204         struct list_head  kib_connd_peers;      /* peers waiting for a connection */
 205         wait_queue_head_t kib_connd_waitq;      /* connection daemon sleep here */
 206         spinlock_t        kib_connd_lock;       /* serialise */
 207
 208         wait_queue_head_t kib_sched_waitq;      /* schedulers sleep here */
 209         spinlock_t        kib_sched_lock;       /* serialise */
 210
 211         struct kib_tx    *kib_tx_descs;         /* all the tx descriptors */
 212         kib_pages_t      *kib_tx_pages;         /* premapped tx msg pages */
 213
 214         struct list_head  kib_idle_txs;         /* idle tx descriptors */
 215         __u64             kib_next_tx_cookie;   /* RDMA completion cookie */
 216         spinlock_t        kib_tx_lock;          /* serialise */
 217
 218         IB_HANDLE         kib_hca;              /* The HCA */
 219         int               kib_port;             /* port on the device */
 220         IB_HANDLE         kib_pd;               /* protection domain */
 221         IB_HANDLE         kib_sd;               /* SD handle */
 222         IB_HANDLE         kib_cq;               /* completion queue */
 223         kib_md_t          kib_whole_mem;        /* whole-mem registration */
 224
 225         int               kib_hca_idx;          /* my HCA number */
 226         uint64            kib_hca_guids[8];     /* all the HCA guids */
 227         IB_CA_ATTRIBUTES  kib_hca_attrs;        /* where to get HCA attrs */
 228
 229         COMMAND_CONTROL_PARAMETERS kib_sdretry; /* control SD query retries */
 230 } kib_data_t;
 231
 232 #define IBNAL_INIT_NOTHING         0
 233 #define IBNAL_INIT_DATA            1
 234 #define IBNAL_INIT_LIB             2
 235 #define IBNAL_INIT_HCA             3
 236 #define IBNAL_INIT_PORTATTRS       4
 237 #define IBNAL_INIT_SD              5
 238 #define IBNAL_INIT_PD              6
 239 #define IBNAL_INIT_MD              7
 240 #define IBNAL_INIT_TXD             8
 241 #define IBNAL_INIT_CQ              9
 242 #define IBNAL_INIT_ALL             10
 243
 244 /************************************************************************
 245  * Wire message structs.
 246  * These are sent in sender's byte order (i.e. receiver flips).
 247  * CAVEAT EMPTOR: other structs communicated between nodes (e.g. MAD
 248  * private data and SM service info), is LE on the wire.
 249  */
 250
 251 typedef struct kib_connparams
 252 {
 253         __u32             ibcp_queue_depth;
 254         __u32             ibcp_max_msg_size;
 255         __u32             ibcp_max_frags;
 256 } WIRE_ATTR kib_connparams_t;
 257
 258 typedef struct
 259 {
 260         lnet_hdr_t        ibim_hdr;             /* portals header */
 261         char              ibim_payload[0];      /* piggy-backed payload */
 262 } WIRE_ATTR kib_immediate_msg_t;
 263
 264 #if IBNAL_USE_FMR
 265 typedef struct
 266 {
 267         __u64             rd_addr;              /* IO VMA address */
 268         __u32             rd_nob;               /* # of bytes */
 269         __u32             rd_key;               /* remote key */
 270 } WIRE_ATTR kib_rdma_desc_t;
 271 #else
 272 typedef struct
 273 {
 274         __u32             rf_nob;               /* # of bytes */
 275         __u64             rf_addr;              /* remote io vaddr */
 276 } WIRE_ATTR kib_rdma_frag_t;
 277
 278 typedef struct
 279 {
 280         __u32             rd_key;               /* local/remote key */
 281         __u32             rd_nfrag;             /* # fragments */
 282         kib_rdma_frag_t   rd_frags[0];          /* buffer frags */
 283 } WIRE_ATTR kib_rdma_desc_t;
 284 #endif
 285
 286 typedef struct
 287 {
 288         lnet_hdr_t        ibprm_hdr;            /* LNET header */
 289         __u64             ibprm_cookie;         /* opaque completion cookie */
 290 } WIRE_ATTR kib_putreq_msg_t;
 291
 292 typedef struct
 293 {
 294         __u64             ibpam_src_cookie;     /* reflected completion cookie */
 295         __u64             ibpam_dst_cookie;     /* opaque completion cookie */
 296         kib_rdma_desc_t   ibpam_rd;             /* sender's sink buffer */
 297 } WIRE_ATTR kib_putack_msg_t;
 298
 299 typedef struct
 300 {
 301         lnet_hdr_t        ibgm_hdr;             /* LNET header */
 302         __u64             ibgm_cookie;          /* opaque completion cookie */
 303         kib_rdma_desc_t   ibgm_rd;              /* sender's sink buffer */
 304 } WIRE_ATTR kib_get_msg_t;
 305
 306 typedef struct
 307 {
 308         __u64             ibcm_cookie;          /* opaque completion cookie */
 309         __u32             ibcm_status;          /* completion status */
 310 } WIRE_ATTR kib_completion_msg_t;
 311
 312 typedef struct
 313 {
 314         /* First 2 fields fixed FOR ALL TIME */
 315         __u32             ibm_magic;            /* I'm an openibnal message */
 316         __u16             ibm_version;          /* this is my version number */
 317
 318         __u8              ibm_type;             /* msg type */
 319         __u8              ibm_credits;          /* returned credits */
 320         __u32             ibm_nob;              /* # bytes in whole message */
 321         __u32             ibm_cksum;            /* checksum (0 == no checksum) */
 322         __u64             ibm_srcnid;           /* sender's NID */
 323         __u64             ibm_srcstamp;         /* sender's incarnation */
 324         __u64             ibm_dstnid;           /* destination's NID */
 325         __u64             ibm_dststamp;         /* destination's incarnation */
 326         __u64             ibm_seq;              /* sequence number */
 327
 328         union {
 329                 kib_connparams_t      connparams;
 330                 kib_immediate_msg_t   immediate;
 331                 kib_putreq_msg_t      putreq;
 332                 kib_putack_msg_t      putack;
 333                 kib_get_msg_t         get;
 334                 kib_completion_msg_t  completion;
 335         } WIRE_ATTR ibm_u;
 336 } WIRE_ATTR kib_msg_t;
 337
 338 #define IBNAL_MSG_MAGIC LNET_PROTO_IIB_MAGIC    /* unique magic */
 339 #define IBNAL_MSG_VERSION              2        /* current protocol version */
 340 #define IBNAL_MSG_VERSION_RDMAREPLYNOTRSRVD 1   /* previous version */
 341
 342 #define IBNAL_MSG_CONNREQ           0xc0        /* connection request */
 343 #define IBNAL_MSG_CONNACK           0xc1        /* connection acknowledge */
 344 #define IBNAL_MSG_NOOP              0xd0        /* nothing (just credits) */
 345 #define IBNAL_MSG_IMMEDIATE         0xd1        /* immediate */
 346 #define IBNAL_MSG_PUT_REQ           0xd2        /* putreq (src->sink) */
 347 #define IBNAL_MSG_PUT_NAK           0xd3        /* completion (sink->src) */
 348 #define IBNAL_MSG_PUT_ACK           0xd4        /* putack (sink->src) */
 349 #define IBNAL_MSG_PUT_DONE          0xd5        /* completion (src->sink) */
 350 #define IBNAL_MSG_GET_REQ           0xd6        /* getreq (sink->src) */
 351 #define IBNAL_MSG_GET_DONE          0xd7        /* completion (src->sink: all OK) */
 352
 353 /* connection rejection reasons */
 354 #define IBNAL_REJECT_CONN_RACE       0          /* You lost connection race */
 355 #define IBNAL_REJECT_NO_RESOURCES    1          /* Out of memory/conns etc */
 356 #define IBNAL_REJECT_FATAL           2          /* Anything else */
 357
 358 /***********************************************************************/
 359
 360 typedef struct kib_rx                           /* receive message */
 361 {
 362         struct list_head          rx_list;      /* queue for attention */
 363         struct kib_conn          *rx_conn;      /* owning conn */
 364         int                       rx_nob;       /* # bytes received (-1 while posted) */
 365         __u64                     rx_hca_msg;   /* pre-mapped buffer (hca vaddr) */
 366         kib_msg_t                *rx_msg;       /* pre-mapped buffer (host vaddr) */
 367         IB_WORK_REQ2              rx_wrq;
 368         IB_LOCAL_DATASEGMENT      rx_gl;        /* and its memory */
 369 } kib_rx_t;
 370
 371 typedef struct kib_tx                           /* transmit message */
 372 {
 373         struct list_head          tx_list;      /* queue on idle_txs ibc_tx_queue etc. */
 374         struct kib_conn          *tx_conn;      /* owning conn */
 375         int                       tx_mapped;    /* mapped for RDMA? */
 376         int                       tx_sending;   /* # tx callbacks outstanding */
 377         int                       tx_queued;    /* queued for sending */
 378         int                       tx_waiting;   /* waiting for peer */
 379         int                       tx_status;    /* completion status */
 380         unsigned long             tx_deadline;  /* completion deadline */
 381         __u64                     tx_cookie;    /* completion cookie */
 382         lnet_msg_t               *tx_lntmsg[2]; /* lnet msgs to finalize on completion */
 383         kib_msg_t                *tx_msg;       /* pre-mapped buffer (host vaddr) */
 384         __u64                     tx_hca_msg;   /* pre-mapped buffer (HCA vaddr) */
 385         int                       tx_nwrq;      /* # send work items */
 386 #if IBNAL_USE_FMR
 387         IB_WORK_REQ2              tx_wrq[2];    /* send work items... */
 388         IB_LOCAL_DATASEGMENT      tx_gl[2];     /* ...and their memory */
 389         kib_rdma_desc_t           tx_rd[1];     /* rdma descriptor */
 390         kib_md_t                  tx_md;        /* mapping */
 391         __u64                    *tx_pages;     /* page phys addrs */
 392 #else
 393         IB_WORK_REQ2             *tx_wrq;       /* send work items... */
 394         IB_LOCAL_DATASEGMENT     *tx_gl;        /* ...and their memory */
 395         kib_rdma_desc_t          *tx_rd;        /* rdma descriptor (src buffers) */
 396 #endif
 397 } kib_tx_t;
 398
 399 typedef struct
 400 {
 401         /* scratchpad during connection establishment */
 402         IB_QP_ATTRIBUTES_QUERY cv_qpattrs;
 403         QUERY                  cv_query;
 404         IB_SERVICE_RECORD      cv_svcrec;
 405         IB_PATH_RECORD         cv_path;
 406         CM_CONN_INFO           cv_cmci;
 407 } kib_connvars_t;
 408
 409 typedef struct kib_conn
 410 {
 411         struct kib_peer    *ibc_peer;           /* owning peer */
 412         struct list_head    ibc_list;           /* stash on peer's conn list */
 413         __u64               ibc_incarnation;    /* which instance of the peer */
 414         __u64               ibc_txseq;          /* tx sequence number */
 415         __u64               ibc_rxseq;          /* rx sequence number */
 416         __u32               ibc_version;        /* peer protocol version */
 417         atomic_t            ibc_refcount;       /* # users */
 418         int                 ibc_state;          /* what's happening */
 419         int                 ibc_nsends_posted;  /* # uncompleted sends */
 420         int                 ibc_credits;        /* # credits I have */
 421         int                 ibc_outstanding_credits; /* # credits to return */
 422         int                 ibc_reserved_credits; /* # credits for ACK/DONE msgs */
 423         unsigned long       ibc_last_send;      /* time of last send */
 424         struct list_head    ibc_early_rxs;      /* rxs completed before ESTABLISHED */
 425         struct list_head    ibc_tx_queue_nocred; /* sends that don't need a cred */
 426         struct list_head    ibc_tx_queue_rsrvd; /* sends that need a reserved cred */
 427         struct list_head    ibc_tx_queue;       /* send queue */
 428         struct list_head    ibc_active_txs;     /* active tx awaiting completion */
 429         spinlock_t          ibc_lock;           /* serialise */
 430         kib_rx_t           *ibc_rxs;            /* the rx descs */
 431         kib_pages_t        *ibc_rx_pages;       /* premapped rx msg pages */
 432         IB_HANDLE           ibc_qp;             /* queue pair */
 433         IB_HANDLE           ibc_cep;            /* CM endpoint */
 434         kib_connvars_t     *ibc_cvars;          /* connection scratchpad */
 435 } kib_conn_t;
 436
 437 #define IBNAL_CONN_INIT_NOTHING      0          /* initial state */
 438 #define IBNAL_CONN_INIT_QP           1          /* ibc_qp set up */
 439 #define IBNAL_CONN_CONNECTING        2          /* started to connect */
 440 #define IBNAL_CONN_ESTABLISHED       3          /* connection established */
 441 #define IBNAL_CONN_DISCONNECTING     4          /* to send disconnect req */
 442 #define IBNAL_CONN_DISCONNECTED      5          /* no more QP or CM traffic */
 443
 444 /* types of connection */
 445 #define IBNAL_CONN_ACTIVE            0          /* active connect */
 446 #define IBNAL_CONN_PASSIVE           1          /* passive connect */
 447 #define IBNAL_CONN_WAITING           2          /* waiting for connect */
 448
 449 typedef struct kib_peer
 450 {
 451         struct list_head    ibp_list;           /* stash on global peer list */
 452         struct list_head    ibp_connd_list;     /* schedule on kib_connd_peers */
 453         lnet_nid_t          ibp_nid;            /* who's on the other end(s) */
 454         atomic_t            ibp_refcount;       /* # users */
 455         int                 ibp_persistence;    /* "known" peer refs */
 456         int                 ibp_version;        /* protocol version */
 457         struct list_head    ibp_conns;          /* all active connections */
 458         struct list_head    ibp_tx_queue;       /* msgs waiting for a conn */
 459         int                 ibp_connecting;     /* active connects in progress */
 460         int                 ibp_accepting;      /* passive connects in progress */
 461         int                 ibp_passivewait;    /* waiting for peer to connect */
 462         unsigned long       ibp_passivewait_deadline; /* when passive wait must complete */
 463         unsigned long       ibp_reconnect_time; /* when reconnect may be attempted */
 464         unsigned long       ibp_reconnect_interval; /* exponential backoff */
 465         int                 ibp_error;          /* errno on closing this peer */
 466         cfs_time_t          ibp_last_alive;     /* when (in jiffies) I was last alive */
 467 } kib_peer_t;
 468
 469
 470 extern kib_data_t      kibnal_data;
 471 extern kib_tunables_t  kibnal_tunables;
 472
 473 /******************************************************************************/
 474
 475 /* these are purposely avoiding using local vars so they don't increase
 476  * stack consumption. */
 477
 478 #define kibnal_conn_addref(conn)                                \
 479 do {                                                            \
 480         CDEBUG(D_NET, "conn[%p] (%d)++\n",                      \
 481                (conn), atomic_read(&(conn)->ibc_refcount));     \
 482         LASSERT(atomic_read(&(conn)->ibc_refcount) > 0);        \
 483         atomic_inc(&(conn)->ibc_refcount);                      \
 484 } while (0)
 485
 486 #define kibnal_conn_decref(conn)                                              \
 487 do {                                                                          \
 488         unsigned long   flags;                                                \
 489                                                                               \
 490         CDEBUG(D_NET, "conn[%p] (%d)--\n",                                    \
 491                (conn), atomic_read(&(conn)->ibc_refcount));                   \
 492         LASSERT(atomic_read(&(conn)->ibc_refcount) > 0);                      \
 493         if (atomic_dec_and_test(&(conn)->ibc_refcount)) {                     \
 494                 spin_lock_irqsave(&kibnal_data.kib_connd_lock, flags);        \
 495                 list_add_tail(&(conn)->ibc_list,                              \
 496                               &kibnal_data.kib_connd_zombies);                \
 497                 wake_up(&kibnal_data.kib_connd_waitq);                        \
 498                 spin_unlock_irqrestore(&kibnal_data.kib_connd_lock, flags);   \
 499         }                                                                     \
 500 } while (0)
 501
 502 #define kibnal_peer_addref(peer)                                \
 503 do {                                                            \
 504         CDEBUG(D_NET, "peer[%p] -> %s (%d)++\n",                \
 505                (peer), libcfs_nid2str((peer)->ibp_nid),         \
 506                atomic_read (&(peer)->ibp_refcount));            \
 507         LASSERT(atomic_read(&(peer)->ibp_refcount) > 0);        \
 508         atomic_inc(&(peer)->ibp_refcount);                      \
 509 } while (0)
 510
 511 #define kibnal_peer_decref(peer)                                \
 512 do {                                                            \
 513         CDEBUG(D_NET, "peer[%p] -> %s (%d)--\n",                \
 514                (peer), libcfs_nid2str((peer)->ibp_nid),         \
 515                atomic_read (&(peer)->ibp_refcount));            \
 516         LASSERT(atomic_read(&(peer)->ibp_refcount) > 0);        \
 517         if (atomic_dec_and_test(&(peer)->ibp_refcount))         \
 518                 kibnal_destroy_peer(peer);                      \
 519 } while (0)
 520
 521 /******************************************************************************/
 522
 523 static inline struct list_head *
 524 kibnal_nid2peerlist (lnet_nid_t nid)
 525 {
 526         unsigned int hash = ((unsigned int)nid) % kibnal_data.kib_peer_hash_size;
 527
 528         return (&kibnal_data.kib_peers [hash]);
 529 }
 530
 531 static inline int
 532 kibnal_peer_active(kib_peer_t *peer)
 533 {
 534         /* Am I in the peer hash table? */
 535         return (!list_empty(&peer->ibp_list));
 536 }
 537
 538 static inline int
 539 kibnal_peer_connecting(kib_peer_t *peer)
 540 {
 541         /* Am I expecting a connection to materialise? */
 542         return (peer->ibp_connecting != 0 ||
 543                 peer->ibp_accepting != 0 ||
 544                 peer->ibp_passivewait);
 545 }
 546
 547 static inline void
 548 kibnal_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
 549 {
 550         struct list_head  *q;
 551
 552         LASSERT (tx->tx_nwrq > 0);              /* work items set up */
 553         LASSERT (!tx->tx_queued);               /* not queued for sending already */
 554
 555         tx->tx_queued = 1;
 556         tx->tx_deadline = jiffies + (*kibnal_tunables.kib_timeout * HZ);
 557
 558         if (tx->tx_conn == NULL) {
 559                 kibnal_conn_addref(conn);
 560                 tx->tx_conn = conn;
 561                 LASSERT (tx->tx_msg->ibm_type != IBNAL_MSG_PUT_DONE);
 562         } else {
 563                 LASSERT (tx->tx_conn == conn);
 564                 LASSERT (tx->tx_msg->ibm_type == IBNAL_MSG_PUT_DONE);
 565         }
 566
 567         if (conn->ibc_version == IBNAL_MSG_VERSION_RDMAREPLYNOTRSRVD) {
 568                 /* All messages have simple credit control */
 569                 q = &conn->ibc_tx_queue;
 570         } else {
 571                 LASSERT (conn->ibc_version == IBNAL_MSG_VERSION);
 572
 573                 switch (tx->tx_msg->ibm_type) {
 574                 case IBNAL_MSG_PUT_REQ:
 575                 case IBNAL_MSG_GET_REQ:
 576                         /* RDMA request: reserve a buffer for the RDMA reply
 577                          * before sending */
 578                         q = &conn->ibc_tx_queue_rsrvd;
 579                         break;
 580
 581                 case IBNAL_MSG_PUT_NAK:
 582                 case IBNAL_MSG_PUT_ACK:
 583                 case IBNAL_MSG_PUT_DONE:
 584                 case IBNAL_MSG_GET_DONE:
 585                         /* RDMA reply/completion: no credits; peer has reserved
 586                          * a reply buffer */
 587                         q = &conn->ibc_tx_queue_nocred;
 588                         break;
 589
 590                 case IBNAL_MSG_NOOP:
 591                 case IBNAL_MSG_IMMEDIATE:
 592                         /* Otherwise: consume a credit before sending */
 593                         q = &conn->ibc_tx_queue;
 594                         break;
 595
 596                 default:
 597                         LBUG();
 598                         q = NULL;
 599                 }
 600         }
 601
 602         list_add_tail(&tx->tx_list, q);
 603 }
 604
 605 static inline int
 606 kibnal_send_keepalive(kib_conn_t *conn)
 607 {
 608         return (*kibnal_tunables.kib_keepalive > 0) &&
 609                 time_after(jiffies, conn->ibc_last_send +
 610                            *kibnal_tunables.kib_keepalive*HZ);
 611 }
 612
 613 #define KIBNAL_SERVICE_KEY_MASK  (IB_SERVICE_RECORD_COMP_SERVICENAME |          \
 614                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_1 |       \
 615                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_2 |       \
 616                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_3 |       \
 617                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_4 |       \
 618                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_5 |       \
 619                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_6 |       \
 620                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_7 |       \
 621                                   IB_SERVICE_RECORD_COMP_SERVICEDATA8_8)
 622
 623 static inline __u64*
 624 kibnal_service_nid_field(IB_SERVICE_RECORD *srv)
 625 {
 626         /* must be consistent with KIBNAL_SERVICE_KEY_MASK */
 627         return (__u64 *)srv->ServiceData8;
 628 }
 629
 630 static inline void
 631 kibnal_set_service_keys(IB_SERVICE_RECORD *srv, lnet_nid_t nid)
 632 {
 633         char *svc_name = *kibnal_tunables.kib_service_name;
 634
 635         LASSERT (strlen(svc_name) < sizeof(srv->ServiceName));
 636         memset (srv->ServiceName, 0, sizeof(srv->ServiceName));
 637         strcpy (srv->ServiceName, svc_name);
 638
 639         *kibnal_service_nid_field(srv) = cpu_to_le64(nid);
 640 }
 641
 642 /* CAVEAT EMPTOR: We rely on tx/rx descriptor alignment to allow us to use the
 643  * lowest 2 bits of the work request id to stash the work item type (the op
 644  * field is not valid when the wc completes in error). */
 645
 646 #define IBNAL_WID_TX    0
 647 #define IBNAL_WID_RX    1
 648 #define IBNAL_WID_RDMA  2
 649 #define IBNAL_WID_MASK  3UL
 650
 651 static inline __u64
 652 kibnal_ptr2wreqid (void *ptr, int type)
 653 {
 654         unsigned long lptr = (unsigned long)ptr;
 655
 656         LASSERT ((lptr & IBNAL_WID_MASK) == 0);
 657         LASSERT ((type & ~IBNAL_WID_MASK) == 0);
 658         return (__u64)(lptr | type);
 659 }
 660
 661 static inline void *
 662 kibnal_wreqid2ptr (__u64 wreqid)
 663 {
 664         return (void *)(((unsigned long)wreqid) & ~IBNAL_WID_MASK);
 665 }
 666
 667 static inline int
 668 kibnal_wreqid2type (__u64 wreqid)
 669 {
 670         return (wreqid & IBNAL_WID_MASK);
 671 }
 672
 673 static inline void
 674 kibnal_set_conn_state (kib_conn_t *conn, int state)
 675 {
 676         CDEBUG(D_NET,"%p state %d\n", conn, state);
 677         conn->ibc_state = state;
 678         mb();
 679 }
 680
 681 #if IBNAL_USE_FMR
 682
 683 static inline int
 684 kibnal_rd_size (kib_rdma_desc_t *rd)
 685 {
 686         return rd->rd_nob;
 687 }
 688
 689 #else
 690 static inline int
 691 kibnal_rd_size (kib_rdma_desc_t *rd)
 692 {
 693         int   i;
 694         int   size;
 695
 696         for (i = size = 0; i < rd->rd_nfrag; i++)
 697                 size += rd->rd_frags[i].rf_nob;
 698
 699         return size;
 700 }
 701 #endif
 702
 703 int  kibnal_startup (lnet_ni_t *ni);
 704 void kibnal_shutdown (lnet_ni_t *ni);
 705 int  kibnal_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg);
 706 int  kibnal_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg);
 707 int  kibnal_eager_recv (lnet_ni_t *ni, void *private,
 708                         lnet_msg_t *lntmsg, void **new_private);
 709 int  kibnal_recv (lnet_ni_t *ni, void *private, lnet_msg_t *msg,
 710                   int delayed, unsigned int niov,
 711                   struct iovec *iov, lnet_kiov_t *kiov,
 712                   unsigned int offset, unsigned int mlen, unsigned int rlen);
 713 void kibnal_init_msg(kib_msg_t *msg, int type, int body_nob);
 714 void kibnal_pack_msg(kib_msg_t *msg, __u32 version, int credits,
 715                      lnet_nid_t dstnid, __u64 dststamp, __u64 seq);
 716 void kibnal_pack_connmsg(kib_msg_t *msg, __u32 version, int nob, int type,
 717                          lnet_nid_t dstnid, __u64 dststamp);
 718 int  kibnal_unpack_msg(kib_msg_t *msg, __u32 expected_version, int nob);
 719 IB_HANDLE kibnal_create_cep(lnet_nid_t nid);
 720 int  kibnal_create_peer (kib_peer_t **peerp, lnet_nid_t nid);
 721 void kibnal_destroy_peer (kib_peer_t *peer);
 722 kib_peer_t *kibnal_find_peer_locked (lnet_nid_t nid);
 723 int  kibnal_del_peer (lnet_nid_t nid);
 724 void kibnal_peer_alive (kib_peer_t *peer);
 725 void kibnal_unlink_peer_locked (kib_peer_t *peer);
 726 int  kibnal_add_persistent_peer (lnet_nid_t nid);
 727 int  kibnal_close_stale_conns_locked (kib_peer_t *peer,
 728                                       __u64 incarnation);
 729 int  kibnal_conn_rts(kib_conn_t *conn,
 730                      __u32 qpn, __u8 resp_res, __u8 init_depth, __u32 psn);
 731 kib_conn_t *kibnal_create_conn (lnet_nid_t nid, int proto_version);
 732 void kibnal_destroy_conn (kib_conn_t *conn);
 733 void kibnal_listen_callback(IB_HANDLE cep, CM_CONN_INFO *info, void *arg);
 734 int  kibnal_alloc_pages (kib_pages_t **pp, int npages);
 735 void kibnal_free_pages (kib_pages_t *p);
 736 void kibnal_queue_tx (kib_tx_t *tx, kib_conn_t *conn);
 737 void kibnal_txlist_done (struct list_head *txlist, int status);
 738 int  kibnal_post_receives (kib_conn_t *conn);
 739 int  kibnal_init_rdma (kib_tx_t *tx, int type, int nob,
 740                        kib_rdma_desc_t *dstrd, __u64 dstcookie);
 741 void kibnal_check_sends (kib_conn_t *conn);
 742 void kibnal_close_conn_locked (kib_conn_t *conn, int error);
 743 int  kibnal_thread_start (int (*fn)(void *arg), void *arg);
 744 int  kibnal_scheduler(void *arg);
 745 int  kibnal_connd (void *arg);
 746 void kibnal_init_tx_msg (kib_tx_t *tx, int type, int body_nob);
 747 void kibnal_close_conn (kib_conn_t *conn, int why);
 748 void kibnal_start_active_rdma (int type, int status,
 749                                kib_rx_t *rx, lnet_msg_t *lntmsg,
 750                                unsigned int niov,
 751                                struct iovec *iov, lnet_kiov_t *kiov,
 752                                unsigned int offset, unsigned int nob);
 753 void kibnal_hca_async_callback (void *hca_arg, IB_EVENT_RECORD *ev);
 754 void kibnal_hca_callback (void *hca_arg, void *cq_arg);
 755 int  kibnal_tunables_init (void);
 756 void kibnal_tunables_fini (void);