1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Copyright (c) 2007, The Ohio State University. All rights reserved. 28 * 29 * Portions of this source code is developed by the team members of 30 * The Ohio State University's Network-Based Computing Laboratory (NBCL), 31 * headed by Professor Dhabaleswar K. (DK) Panda. 32 * 33 * Acknowledgements to contributions from developors: 34 * Ranjit Noronha: noronha@cse.ohio-state.edu 35 * Lei Chai : chail@cse.ohio-state.edu 36 * Weikuan Yu : yuw@cse.ohio-state.edu 37 * 38 */ 39 40 #ifndef _RPC_RPC_RDMA_H 41 #define _RPC_RPC_RDMA_H 42 43 #include <rpc/rpc.h> 44 #include <rpc/rpc_sztypes.h> 45 #include <sys/sunddi.h> 46 #include <sys/sunldi.h> 47 48 #ifdef __cplusplus 49 extern "C" { 50 #endif 51 52 #define RPCRDMA_VERS 1 /* Version of the RPC over RDMA protocol */ 53 #define RDMATF_VERS 1 /* Version of the API used by RPC for RDMA */ 54 #define RDMATF_VERS_1 1 /* Current version of RDMATF */ 55 56 /* 57 * The size of an RPC call or reply message 58 */ 59 #define RPC_MSG_SZ 1024 60 61 /* 62 * RDMA chunk size 63 */ 64 #define RDMA_MINCHUNK 1024 65 66 /* 67 * Storage for a chunk list 68 */ 69 #define RPC_CL_SZ 1024 70 71 /* 72 * Chunk size 73 */ 74 #define MINCHUNK 1024 75 76 /* 77 * Size of receive buffer 78 */ 79 #define RPC_BUF_SIZE 2048 80 81 #define NOWAIT 0 /* don't wait for operation of complete */ 82 #define WAIT 1 /* wait and ensure that operation is complete */ 83 84 /* 85 * RDMA xdr buffer control and other control flags. Add new flags here, 86 * set them in private structure for xdr over RDMA in xdr_rdma.c 87 */ 88 #define XDR_RDMA_CHUNK 0x1 89 #define XDR_RDMA_WLIST_REG 0x2 90 #define XDR_RDMA_RLIST_REG 0x4 91 92 #define LONG_REPLY_LEN 65536 93 #define WCL_BUF_LEN 32768 94 #define RCL_BUF_LEN 32768 95 96 97 #define RDMA_BUFS_RQST 34 /* Num bufs requested by client */ 98 #define RDMA_BUFS_GRANT 32 /* Num bufs granted by server */ 99 100 struct xdr_ops *xdrrdma_xops(void); 101 102 /* 103 * Credit Control Structures. 104 */ 105 typedef enum rdma_cc_type { 106 RDMA_CC_CLNT, /* CONN is for a client */ 107 RDMA_CC_SRV /* CONN is for a server */ 108 } rdma_cc_type_t; 109 110 /* 111 * Client side credit control data structure. 112 */ 113 typedef struct rdma_clnt_cred_ctrl { 114 uint32_t clnt_cc_granted_ops; 115 uint32_t clnt_cc_in_flight_ops; 116 kcondvar_t clnt_cc_cv; 117 } rdma_clnt_cred_ctrl_t; 118 119 /* 120 * Server side credit control data structure. 121 */ 122 typedef struct rdma_srv_cred_ctrl { 123 uint32_t srv_cc_buffers_granted; 124 uint32_t srv_cc_cur_buffers_used; 125 uint32_t srv_cc_posted; 126 uint32_t srv_cc_max_buf_size; /* to be determined by CCP */ 127 uint32_t srv_cc_cur_buf_size; /* to be determined by CCP */ 128 } rdma_srv_cred_ctrl_t; 129 130 typedef enum { 131 RPCCALL_WLIST, 132 RPCCALL_WCHUNK, 133 RPCCALL_NOWRITE 134 }rpccall_write_t; 135 136 typedef enum { 137 CLIST_REG_SOURCE = 1, 138 CLIST_REG_DST 139 } clist_dstsrc; 140 141 /* 142 * Return codes from RDMA operations 143 */ 144 typedef enum { 145 146 RDMA_SUCCESS = 0, /* successful operation */ 147 148 RDMA_INVAL = 1, /* invalid parameter */ 149 RDMA_TIMEDOUT = 2, /* operation timed out */ 150 RDMA_INTR = 3, /* operation interrupted */ 151 RDMA_NORESOURCE = 4, /* insufficient resource */ 152 /* 153 * connection errors 154 */ 155 RDMA_REJECT = 5, /* connection req rejected */ 156 RDMA_NOLISTENER = 6, /* no listener on server */ 157 RDMA_UNREACHABLE = 7, /* host unreachable */ 158 RDMA_CONNLOST = 8, /* connection lost */ 159 160 RDMA_XPRTFAILED = 9, /* RDMA transport failed */ 161 RDMA_PROTECTERR = 10, /* memory protection error */ 162 RDMA_OVERRUN = 11, /* transport overrun */ 163 RDMA_RECVQEMPTY = 12, /* incoming pkt dropped, recv q empty */ 164 RDMA_PROTFAILED = 13, /* RDMA protocol failed */ 165 RDMA_NOTSUPP = 14, /* requested feature not supported */ 166 RDMA_REMOTERR = 15, /* error at remote end */ 167 /* 168 * RDMATF errors 169 */ 170 RDMA_BADVERS = 16, /* mismatch RDMATF versions */ 171 RDMA_REG_EXIST = 17, /* RDMATF registration already exists */ 172 RDMA_HCA_ATTACH = 18, 173 RDMA_HCA_DETACH = 19, 174 175 /* 176 * fallback error 177 */ 178 RDMA_FAILED = 20 /* generic error */ 179 } rdma_stat; 180 181 /* 182 * Memory region context. This is an RDMA provider generated 183 * handle for a registered arbitrary size contiguous virtual 184 * memory. The RDMA Interface Adapter needs this for local or 185 * remote memory access. 186 * 187 * The mrc_rmr field holds the remote memory region context 188 * which is sent over-the-wire to provide the remote host 189 * with RDMA access to the memory region. 190 */ 191 struct mrc { 192 uint32_t mrc_rmr; /* Remote MR context, sent OTW */ 193 union { 194 struct mr { 195 uint32_t lmr; /* Local MR context */ 196 uint64_t linfo; /* Local memory info */ 197 } mr; 198 } lhdl; 199 }; 200 201 #define mrc_lmr lhdl.mr.lmr 202 #define mrc_linfo lhdl.mr.linfo 203 204 /* 205 * Memory management for the RDMA buffers 206 */ 207 /* 208 * RDMA buffer types 209 */ 210 typedef enum { 211 SEND_BUFFER, /* buf for send msg */ 212 SEND_DESCRIPTOR, /* buf used for send msg descriptor in plugins only */ 213 RECV_BUFFER, /* buf for recv msg */ 214 RECV_DESCRIPTOR, /* buf used for recv msg descriptor in plugins only */ 215 RDMA_LONG_BUFFER /* chunk buf used in RDMATF only and not in plugins */ 216 } rdma_btype; 217 218 /* 219 * RDMA buffer information 220 */ 221 typedef struct rdma_buf { 222 rdma_btype type; /* buffer type */ 223 uint_t len; /* length of buffer */ 224 caddr_t addr; /* buffer address */ 225 struct mrc handle; /* buffer registration handle */ 226 caddr_t rb_private; 227 } rdma_buf_t; 228 229 230 /* 231 * The XDR offset value is used by the XDR 232 * routine to identify the position in the 233 * RPC message where the opaque object would 234 * normally occur. Neither the data content 235 * of the chunk, nor its size field are included 236 * in the RPC message. The XDR offset is calculated 237 * as if the chunks were present. 238 * 239 * The remaining fields identify the chunk of data 240 * on the sender. The c_memhandle identifies a 241 * registered RDMA memory region and the c_addr 242 * and c_len fields identify the chunk within it. 243 */ 244 struct clist { 245 uint32 c_xdroff; /* XDR offset */ 246 uint32 c_len; /* Length */ 247 clist_dstsrc c_regtype; /* type of registration */ 248 struct mrc c_smemhandle; /* src memory handle */ 249 uint64 c_ssynchandle; /* src sync handle */ 250 union { 251 uint64 c_saddr; /* src address */ 252 caddr_t c_saddr3; 253 } w; 254 struct mrc c_dmemhandle; /* dst memory handle */ 255 uint64 c_dsynchandle; /* dst sync handle */ 256 union { 257 uint64 c_daddr; /* dst address */ 258 caddr_t c_daddr3; 259 } u; 260 struct as *c_adspc; /* address space for saddr/daddr */ 261 rdma_buf_t rb_longbuf; /* used for long requests/replies */ 262 struct clist *c_next; /* Next chunk */ 263 }; 264 265 typedef struct clist clist; 266 267 /* 268 * max 4M wlist xfer size 269 * This is defined because the rfs3_tsize service requires 270 * svc_req struct (which we don't have that in krecv). 271 */ 272 #define MAX_SVC_XFER_SIZE (4*1024*1024) 273 274 enum rdma_proc { 275 RDMA_MSG = 0, /* chunk list and RPC msg follow */ 276 RDMA_NOMSG = 1, /* only chunk list follows */ 277 RDMA_MSGP = 2, /* chunk list and RPC msg with padding follow */ 278 RDMA_DONE = 3 /* signal completion of chunk transfer */ 279 }; 280 281 /* 282 * Listener information for a service 283 */ 284 struct rdma_svc_data { 285 queue_t q; /* queue_t to place incoming pkts */ 286 int active; /* If active, after registeration startup */ 287 rdma_stat err_code; /* Error code from plugin layer */ 288 int32_t svcid; /* RDMA based service identifier */ 289 }; 290 291 /* 292 * Per RDMA plugin module information. 293 * Will be populated by each plugin 294 * module during its initialization. 295 */ 296 typedef struct rdma_mod { 297 char *rdma_api; /* "kvipl", "ibtf", etc */ 298 uint_t rdma_version; /* RDMATF API version */ 299 int rdma_count; /* # of devices */ 300 struct rdmaops *rdma_ops; /* rdma op vector for api */ 301 } rdma_mod_t; 302 303 /* 304 * Registry of RDMA plugins 305 */ 306 typedef struct rdma_registry { 307 rdma_mod_t *r_mod; /* plugin mod info */ 308 uint32_t r_mod_state; 309 struct rdma_registry *r_next; /* next registered RDMA plugin */ 310 } rdma_registry_t; 311 312 /* 313 * RDMA MODULE state flags (r_mod_state). 314 */ 315 #define RDMA_MOD_ACTIVE 1 316 #define RDMA_MOD_INACTIVE 0 317 318 /* 319 * RDMA transport information 320 */ 321 typedef struct rdma_info { 322 uint_t addrlen; /* address length */ 323 uint_t mts; /* max transfer size */ 324 uint_t mtu; /* native mtu size of unlerlying network */ 325 } rdma_info_t; 326 327 typedef enum { 328 C_IDLE = 0x00000001, 329 C_CONN_PEND = 0x00000002, 330 C_CONNECTED = 0x00000004, 331 C_ERROR_CONN = 0x00000008, 332 C_DISCONN_PEND = 0x00000010, 333 C_REMOTE_DOWN = 0x00000020 334 } conn_c_state; 335 336 /* c_flags */ 337 #define C_CLOSE_NOTNEEDED 0x00000001 /* just free the channel */ 338 #define C_CLOSE_PENDING 0x00000002 /* a close in progress */ 339 340 /* 341 * RDMA Connection information 342 */ 343 typedef struct conn { 344 rdma_mod_t *c_rdmamod; /* RDMA transport info for conn */ 345 struct netbuf c_raddr; /* remote address */ 346 struct netbuf c_laddr; /* local address */ 347 int c_ref; /* no. of clients of connection */ 348 struct conn *c_next; /* next in list of connections */ 349 struct conn *c_prev; /* prev in list of connections */ 350 caddr_t c_private; /* transport specific stuff */ 351 conn_c_state c_state; /* state of connection */ 352 int c_flags; /* flags for connection management */ 353 rdma_cc_type_t c_cc_type; /* client or server, for credit cntrl */ 354 union { 355 rdma_clnt_cred_ctrl_t c_clnt_cc; 356 rdma_srv_cred_ctrl_t c_srv_cc; 357 } rdma_conn_cred_ctrl_u; 358 kmutex_t c_lock; /* protect c_state and c_ref fields */ 359 kcondvar_t c_cv; /* to signal when pending is done */ 360 timeout_id_t c_timeout; /* timeout id for untimeout() */ 361 time_t c_last_used; /* last time any activity on the conn */ 362 } CONN; 363 364 365 /* 366 * Data transferred from plugin interrupt to svc_queuereq() 367 */ 368 typedef struct rdma_recv_data { 369 CONN *conn; 370 int status; 371 rdma_buf_t rpcmsg; 372 } rdma_recv_data_t; 373 374 /* structure used to pass information for READ over rdma write */ 375 typedef enum { 376 RCI_WRITE_UIO_CHUNK = 1, 377 RCI_WRITE_ADDR_CHUNK = 2, 378 RCI_REPLY_CHUNK = 3 379 } rci_type_t; 380 381 typedef struct { 382 rci_type_t rci_type; 383 union { 384 struct uio *rci_uiop; 385 caddr_t rci_addr; 386 } rci_a; 387 uint32 rci_len; 388 struct clist **rci_clpp; /* point to write chunk list in readargs */ 389 } rdma_chunkinfo_t; 390 391 typedef struct { 392 uint_t rcil_len; 393 uint_t rcil_len_alt; 394 } rdma_chunkinfo_lengths_t; 395 396 typedef struct { 397 struct clist *rwci_wlist; 398 CONN *rwci_conn; 399 } rdma_wlist_conn_info_t; 400 401 /* 402 * Operations vector for RDMA transports. 403 */ 404 typedef struct rdmaops { 405 /* Network */ 406 rdma_stat (*rdma_reachable)(int addr_type, struct netbuf *, 407 void **handle); 408 /* Connection */ 409 rdma_stat (*rdma_get_conn)(struct netbuf *, int addr_type, 410 void *, CONN **); 411 rdma_stat (*rdma_rel_conn)(CONN *); 412 /* Server side listner start and stop routines */ 413 void (*rdma_svc_listen)(struct rdma_svc_data *); 414 void (*rdma_svc_stop)(struct rdma_svc_data *); 415 /* Memory */ 416 rdma_stat (*rdma_regmem)(CONN *, caddr_t, caddr_t, 417 uint_t, struct mrc *); 418 rdma_stat (*rdma_deregmem)(CONN *, caddr_t, struct mrc); 419 rdma_stat (*rdma_regmemsync)(CONN *, caddr_t, caddr_t, uint_t, 420 struct mrc *, void **, void *); 421 rdma_stat (*rdma_deregmemsync)(CONN *, caddr_t, struct mrc, 422 void *, void *); 423 rdma_stat (*rdma_syncmem)(CONN *, void *, caddr_t, int, int); 424 /* Buffer */ 425 rdma_stat (*rdma_buf_alloc)(CONN *, rdma_buf_t *); 426 void (*rdma_buf_free)(CONN *, rdma_buf_t *); 427 /* Transfer */ 428 rdma_stat (*rdma_send)(CONN *, clist *, uint32_t); 429 rdma_stat (*rdma_send_resp)(CONN *, clist *, uint32_t); 430 rdma_stat (*rdma_clnt_recvbuf)(CONN *, clist *, uint32_t); 431 rdma_stat (*rdma_clnt_recvbuf_remove)(CONN *, uint32_t); 432 rdma_stat (*rdma_svc_recvbuf)(CONN *, clist *); 433 rdma_stat (*rdma_recv)(CONN *, clist **, uint32_t); 434 /* RDMA */ 435 rdma_stat (*rdma_read)(CONN *, clist *, int); 436 rdma_stat (*rdma_write)(CONN *, clist *, int); 437 /* INFO */ 438 rdma_stat (*rdma_getinfo)(rdma_info_t *info); 439 } rdmaops_t; 440 441 typedef struct rdma_svc_wait { 442 kmutex_t svc_lock; 443 kcondvar_t svc_cv; 444 rdma_stat svc_stat; 445 } rdma_svc_wait_t; 446 447 extern rdma_svc_wait_t rdma_wait; 448 449 /* 450 * RDMA operations. 451 */ 452 #define RDMA_REACHABLE(rdma_ops, addr_type, addr, handle) \ 453 (*(rdma_ops)->rdma_reachable)(addr_type, addr, handle) 454 455 #define RDMA_GET_CONN(rdma_ops, addr, addr_type, handle, conn) \ 456 (*(rdma_ops)->rdma_get_conn)(addr, addr_type, handle, conn) 457 458 #define RDMA_REL_CONN(conn) \ 459 (*(conn)->c_rdmamod->rdma_ops->rdma_rel_conn)(conn) 460 461 #define RDMA_REGMEM(conn, adsp, buff, len, handle) \ 462 (*(conn)->c_rdmamod->rdma_ops->rdma_regmem)(conn, adsp, \ 463 buff, len, handle) 464 465 #define RDMA_DEREGMEM(conn, buff, handle) \ 466 (*(conn)->c_rdmamod->rdma_ops->rdma_deregmem)(conn, buff, handle) 467 468 #define RDMA_REGMEMSYNC(conn, adsp, buff, len, handle, synchandle, lrc) \ 469 (*(conn)->c_rdmamod->rdma_ops->rdma_regmemsync)(conn, adsp, buff, \ 470 len, handle, synchandle, lrc) 471 472 #define RDMA_DEREGMEMSYNC(conn, buff, handle, synchandle, lrc) \ 473 (*(conn)->c_rdmamod->rdma_ops->rdma_deregmemsync)(conn, buff, \ 474 handle, synchandle, lrc) 475 476 #define RDMA_SYNCMEM(conn, handle, buff, len, direction) \ 477 (*(conn)->c_rdmamod->rdma_ops->rdma_syncmem)(conn, handle, \ 478 buff, len, direction) 479 480 #define RDMA_BUF_ALLOC(conn, rbuf) \ 481 (*(conn)->c_rdmamod->rdma_ops->rdma_buf_alloc)(conn, rbuf) 482 483 #define RDMA_BUF_FREE(conn, rbuf) \ 484 (*(conn)->c_rdmamod->rdma_ops->rdma_buf_free)(conn, rbuf) 485 486 #define RDMA_SEND(conn, sendlist, xid) \ 487 (*(conn)->c_rdmamod->rdma_ops->rdma_send)(conn, sendlist, xid) 488 489 #define RDMA_SEND_RESP(conn, sendlist, xid) \ 490 (*(conn)->c_rdmamod->rdma_ops->rdma_send_resp)(conn, sendlist, xid) 491 492 #define RDMA_CLNT_RECVBUF(conn, cl, xid) \ 493 (*(conn)->c_rdmamod->rdma_ops->rdma_clnt_recvbuf)(conn, cl, xid) 494 495 #define RDMA_CLNT_RECVBUF_REMOVE(conn, xid) \ 496 (*(conn)->c_rdmamod->rdma_ops->rdma_clnt_recvbuf_remove)(conn, xid) 497 498 #define RDMA_SVC_RECVBUF(conn, cl) \ 499 (*(conn)->c_rdmamod->rdma_ops->rdma_svc_recvbuf)(conn, cl) 500 501 #define RDMA_RECV(conn, recvlist, xid) \ 502 (*(conn)->c_rdmamod->rdma_ops->rdma_recv)(conn, recvlist, xid) 503 504 #define RDMA_READ(conn, cl, wait) \ 505 (*(conn)->c_rdmamod->rdma_ops->rdma_read)(conn, cl, wait) 506 507 #define RDMA_WRITE(conn, cl, wait) \ 508 (*(conn)->c_rdmamod->rdma_ops->rdma_write)(conn, cl, wait) 509 510 #define RDMA_GETINFO(rdma_mod, info) \ 511 (*(rdma_mod)->rdma_ops->rdma_getinfo)(info) 512 513 #ifdef _KERNEL 514 extern rdma_registry_t *rdma_mod_head; 515 extern krwlock_t rdma_lock; /* protects rdma_mod_head list */ 516 extern int rdma_modloaded; /* flag for loading RDMA plugins */ 517 extern int rdma_dev_available; /* rdma device is loaded or not */ 518 extern kmutex_t rdma_modload_lock; /* protects rdma_modloaded flag */ 519 extern uint_t rdma_minchunk; 520 extern ldi_ident_t rpcmod_li; /* needed by layed driver framework */ 521 522 /* 523 * General RDMA routines 524 */ 525 extern struct clist *clist_alloc(void); 526 extern void clist_add(struct clist **, uint32_t, int, 527 struct mrc *, caddr_t, struct mrc *, caddr_t); 528 extern void clist_free(struct clist *); 529 extern uint32_t clist_len(struct clist *); 530 extern void clist_zero_len(struct clist *); 531 extern rdma_stat clist_register(CONN *conn, struct clist *cl, clist_dstsrc); 532 extern rdma_stat clist_deregister(CONN *conn, struct clist *cl); 533 extern rdma_stat clist_syncmem(CONN *conn, struct clist *cl, clist_dstsrc); 534 extern rdma_stat rdma_clnt_postrecv(CONN *conn, uint32_t xid); 535 extern rdma_stat rdma_clnt_postrecv_remove(CONN *conn, uint32_t xid); 536 extern rdma_stat rdma_svc_postrecv(CONN *conn); 537 extern rdma_stat rdma_register_mod(rdma_mod_t *mod); 538 extern rdma_stat rdma_unregister_mod(rdma_mod_t *mod); 539 extern rdma_stat rdma_buf_alloc(CONN *, rdma_buf_t *); 540 extern void rdma_buf_free(CONN *, rdma_buf_t *); 541 extern int rdma_modload(); 542 extern bool_t rdma_get_wchunk(struct svc_req *, iovec_t *, struct clist *); 543 extern rdma_stat rdma_kwait(void); 544 extern int rdma_setup_read_chunks(struct clist *, uint32_t, int *); 545 546 /* 547 * RDMA XDR 548 */ 549 extern void xdrrdma_create(XDR *, caddr_t, uint_t, int, struct clist *, 550 enum xdr_op, CONN *); 551 extern void xdrrdma_destroy(XDR *); 552 553 extern uint_t xdrrdma_getpos(XDR *); 554 extern bool_t xdrrdma_setpos(XDR *, uint_t); 555 extern bool_t xdr_clist(XDR *, clist *); 556 extern bool_t xdr_do_clist(XDR *, clist **); 557 extern uint_t xdr_getbufsize(XDR *); 558 extern unsigned int xdrrdma_sizeof(xdrproc_t, void *, int, uint_t *, uint_t *); 559 extern unsigned int xdrrdma_authsize(AUTH *, struct cred *, int); 560 561 extern void xdrrdma_store_wlist(XDR *, struct clist *); 562 extern struct clist *xdrrdma_wclist(XDR *); 563 extern bool_t xdr_decode_reply_wchunk(XDR *, struct clist **); 564 extern bool_t xdr_decode_wlist(XDR *xdrs, struct clist **, bool_t *); 565 extern bool_t xdr_decode_wlist_svc(XDR *xdrs, struct clist **, bool_t *, 566 uint32_t *, CONN *); 567 extern bool_t xdr_encode_rlist_svc(XDR *, clist *); 568 extern bool_t xdr_encode_wlist(XDR *, clist *); 569 extern bool_t xdr_encode_reply_wchunk(XDR *, struct clist *, 570 uint32_t seg_array_len); 571 bool_t xdrrdma_getrdmablk(XDR *, struct clist **, uint_t *, 572 CONN **conn, const uint_t); 573 bool_t xdrrdma_read_from_client(struct clist *, CONN **, uint_t); 574 bool_t xdrrdma_send_read_data(XDR *, uint_t, struct clist *); 575 bool_t xdrrdma_free_clist(CONN *, struct clist *); 576 #endif /* _KERNEL */ 577 578 #ifdef __cplusplus 579 } 580 #endif 581 582 #endif /* _RPC_RPC_RDMA_H */ 583