1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ 2 /* 3 * Copyright (c) 2014-2017 Oracle. All rights reserved. 4 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the BSD-type 10 * license below: 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 19 * Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials provided 22 * with the distribution. 23 * 24 * Neither the name of the Network Appliance, Inc. nor the names of 25 * its contributors may be used to endorse or promote products 26 * derived from this software without specific prior written 27 * permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H 43 #define _LINUX_SUNRPC_XPRT_RDMA_H 44 45 #include <linux/wait.h> /* wait_queue_head_t, etc */ 46 #include <linux/spinlock.h> /* spinlock_t, etc */ 47 #include <linux/atomic.h> /* atomic_t, etc */ 48 #include <linux/workqueue.h> /* struct work_struct */ 49 50 #include <rdma/rdma_cm.h> /* RDMA connection api */ 51 #include <rdma/ib_verbs.h> /* RDMA verbs api */ 52 53 #include <linux/sunrpc/clnt.h> /* rpc_xprt */ 54 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ 55 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ 56 57 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ 58 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ 59 60 #define RPCRDMA_BIND_TO (60U * HZ) 61 #define RPCRDMA_INIT_REEST_TO (5U * HZ) 62 #define RPCRDMA_MAX_REEST_TO (30U * HZ) 63 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) 64 65 /* 66 * Interface Adapter -- one per transport instance 67 */ 68 struct rpcrdma_ia { 69 struct rdma_cm_id *ri_id; 70 struct ib_pd *ri_pd; 71 int ri_async_rc; 72 unsigned int ri_max_segs; 73 unsigned int ri_max_frwr_depth; 74 unsigned int ri_max_send_sges; 75 bool ri_implicit_roundup; 76 enum ib_mr_type ri_mrtype; 77 unsigned long ri_flags; 78 struct completion ri_done; 79 struct completion ri_remove_done; 80 }; 81 82 enum { 83 RPCRDMA_IAF_REMOVING = 0, 84 }; 85 86 /* 87 * RDMA Endpoint -- one per transport instance 88 */ 89 90 struct rpcrdma_ep { 91 unsigned int rep_send_count; 92 unsigned int rep_send_batch; 93 unsigned int rep_max_inline_send; 94 unsigned int rep_max_inline_recv; 95 int rep_connected; 96 struct ib_qp_init_attr rep_attr; 97 wait_queue_head_t rep_connect_wait; 98 struct rpcrdma_connect_private rep_cm_private; 99 struct rdma_conn_param rep_remote_cma; 100 unsigned int rep_max_requests; /* set by /proc */ 101 unsigned int rep_inline_send; /* negotiated */ 102 unsigned int rep_inline_recv; /* negotiated */ 103 int rep_receive_count; 104 }; 105 106 /* Pre-allocate extra Work Requests for handling backward receives 107 * and sends. This is a fixed value because the Work Queues are 108 * allocated when the forward channel is set up, long before the 109 * backchannel is provisioned. This value is two times 110 * NFS4_DEF_CB_SLOT_TABLE_SIZE. 111 */ 112 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 113 #define RPCRDMA_BACKWARD_WRS (32) 114 #else 115 #define RPCRDMA_BACKWARD_WRS (0) 116 #endif 117 118 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 119 * 120 * The below structure appears at the front of a large region of kmalloc'd 121 * memory, which always starts on a good alignment boundary. 122 */ 123 124 struct rpcrdma_regbuf { 125 struct ib_sge rg_iov; 126 struct ib_device *rg_device; 127 enum dma_data_direction rg_direction; 128 void *rg_data; 129 }; 130 131 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb) 132 { 133 return rb->rg_iov.addr; 134 } 135 136 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb) 137 { 138 return rb->rg_iov.length; 139 } 140 141 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb) 142 { 143 return rb->rg_iov.lkey; 144 } 145 146 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb) 147 { 148 return rb->rg_device; 149 } 150 151 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) 152 { 153 return rb->rg_data; 154 } 155 156 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 157 158 /* To ensure a transport can always make forward progress, 159 * the number of RDMA segments allowed in header chunk lists 160 * is capped at 8. This prevents less-capable devices and 161 * memory registrations from overrunning the Send buffer 162 * while building chunk lists. 163 * 164 * Elements of the Read list take up more room than the 165 * Write list or Reply chunk. 8 read segments means the Read 166 * list (or Write list or Reply chunk) cannot consume more 167 * than 168 * 169 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 170 * 171 * And the fixed part of the header is another 24 bytes. 172 * 173 * The smallest inline threshold is 1024 bytes, ensuring that 174 * at least 750 bytes are available for RPC messages. 175 */ 176 enum { 177 RPCRDMA_MAX_HDR_SEGS = 8, 178 RPCRDMA_HDRBUF_SIZE = 256, 179 }; 180 181 /* 182 * struct rpcrdma_rep -- this structure encapsulates state required 183 * to receive and complete an RPC Reply, asychronously. It needs 184 * several pieces of state: 185 * 186 * o receive buffer and ib_sge (donated to provider) 187 * o status of receive (success or not, length, inv rkey) 188 * o bookkeeping state to get run by reply handler (XDR stream) 189 * 190 * These structures are allocated during transport initialization. 191 * N of these are associated with a transport instance, managed by 192 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 193 */ 194 195 struct rpcrdma_rep { 196 struct ib_cqe rr_cqe; 197 __be32 rr_xid; 198 __be32 rr_vers; 199 __be32 rr_proc; 200 int rr_wc_flags; 201 u32 rr_inv_rkey; 202 bool rr_temp; 203 struct rpcrdma_regbuf *rr_rdmabuf; 204 struct rpcrdma_xprt *rr_rxprt; 205 struct work_struct rr_work; 206 struct xdr_buf rr_hdrbuf; 207 struct xdr_stream rr_stream; 208 struct rpc_rqst *rr_rqst; 209 struct list_head rr_list; 210 struct ib_recv_wr rr_recv_wr; 211 }; 212 213 /* To reduce the rate at which a transport invokes ib_post_recv 214 * (and thus the hardware doorbell rate), xprtrdma posts Receive 215 * WRs in batches. 216 * 217 * Setting this to zero disables Receive post batching. 218 */ 219 enum { 220 RPCRDMA_MAX_RECV_BATCH = 7, 221 }; 222 223 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes 224 */ 225 struct rpcrdma_req; 226 struct rpcrdma_xprt; 227 struct rpcrdma_sendctx { 228 struct ib_send_wr sc_wr; 229 struct ib_cqe sc_cqe; 230 struct ib_device *sc_device; 231 struct rpcrdma_xprt *sc_xprt; 232 struct rpcrdma_req *sc_req; 233 unsigned int sc_unmap_count; 234 struct ib_sge sc_sges[]; 235 }; 236 237 /* 238 * struct rpcrdma_mr - external memory region metadata 239 * 240 * An external memory region is any buffer or page that is registered 241 * on the fly (ie, not pre-registered). 242 */ 243 enum rpcrdma_frwr_state { 244 FRWR_IS_INVALID, /* ready to be used */ 245 FRWR_IS_VALID, /* in use */ 246 FRWR_FLUSHED_FR, /* flushed FASTREG WR */ 247 FRWR_FLUSHED_LI, /* flushed LOCALINV WR */ 248 }; 249 250 struct rpcrdma_frwr { 251 struct ib_mr *fr_mr; 252 struct ib_cqe fr_cqe; 253 enum rpcrdma_frwr_state fr_state; 254 struct completion fr_linv_done; 255 union { 256 struct ib_reg_wr fr_regwr; 257 struct ib_send_wr fr_invwr; 258 }; 259 }; 260 261 struct rpcrdma_mr { 262 struct list_head mr_list; 263 struct scatterlist *mr_sg; 264 int mr_nents; 265 enum dma_data_direction mr_dir; 266 struct rpcrdma_frwr frwr; 267 struct rpcrdma_xprt *mr_xprt; 268 u32 mr_handle; 269 u32 mr_length; 270 u64 mr_offset; 271 struct work_struct mr_recycle; 272 struct list_head mr_all; 273 }; 274 275 /* 276 * struct rpcrdma_req -- structure central to the request/reply sequence. 277 * 278 * N of these are associated with a transport instance, and stored in 279 * struct rpcrdma_buffer. N is the max number of outstanding requests. 280 * 281 * It includes pre-registered buffer memory for send AND recv. 282 * The recv buffer, however, is not owned by this structure, and 283 * is "donated" to the hardware when a recv is posted. When a 284 * reply is handled, the recv buffer used is given back to the 285 * struct rpcrdma_req associated with the request. 286 * 287 * In addition to the basic memory, this structure includes an array 288 * of iovs for send operations. The reason is that the iovs passed to 289 * ib_post_{send,recv} must not be modified until the work request 290 * completes. 291 */ 292 293 /* Maximum number of page-sized "segments" per chunk list to be 294 * registered or invalidated. Must handle a Reply chunk: 295 */ 296 enum { 297 RPCRDMA_MAX_IOV_SEGS = 3, 298 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 299 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 300 RPCRDMA_MAX_IOV_SEGS, 301 }; 302 303 struct rpcrdma_mr_seg { /* chunk descriptors */ 304 u32 mr_len; /* length of chunk or segment */ 305 struct page *mr_page; /* owning page, if any */ 306 char *mr_offset; /* kva if no page, else offset */ 307 }; 308 309 /* The Send SGE array is provisioned to send a maximum size 310 * inline request: 311 * - RPC-over-RDMA header 312 * - xdr_buf head iovec 313 * - RPCRDMA_MAX_INLINE bytes, in pages 314 * - xdr_buf tail iovec 315 * 316 * The actual number of array elements consumed by each RPC 317 * depends on the device's max_sge limit. 318 */ 319 enum { 320 RPCRDMA_MIN_SEND_SGES = 3, 321 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 322 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 323 }; 324 325 struct rpcrdma_buffer; 326 struct rpcrdma_req { 327 struct list_head rl_list; 328 struct rpc_rqst rl_slot; 329 struct rpcrdma_buffer *rl_buffer; 330 struct rpcrdma_rep *rl_reply; 331 struct xdr_stream rl_stream; 332 struct xdr_buf rl_hdrbuf; 333 struct rpcrdma_sendctx *rl_sendctx; 334 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 335 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 336 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 337 338 struct list_head rl_all; 339 unsigned long rl_flags; 340 341 struct list_head rl_registered; /* registered segments */ 342 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 343 }; 344 345 /* rl_flags */ 346 enum { 347 RPCRDMA_REQ_F_PENDING = 0, 348 RPCRDMA_REQ_F_TX_RESOURCES, 349 }; 350 351 static inline struct rpcrdma_req * 352 rpcr_to_rdmar(const struct rpc_rqst *rqst) 353 { 354 return container_of(rqst, struct rpcrdma_req, rl_slot); 355 } 356 357 static inline void 358 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 359 { 360 list_add_tail(&mr->mr_list, list); 361 } 362 363 static inline struct rpcrdma_mr * 364 rpcrdma_mr_pop(struct list_head *list) 365 { 366 struct rpcrdma_mr *mr; 367 368 mr = list_first_entry(list, struct rpcrdma_mr, mr_list); 369 list_del_init(&mr->mr_list); 370 return mr; 371 } 372 373 /* 374 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 375 * inline requests/replies, and client/server credits. 376 * 377 * One of these is associated with a transport instance 378 */ 379 struct rpcrdma_buffer { 380 spinlock_t rb_mrlock; /* protect rb_mrs list */ 381 struct list_head rb_mrs; 382 struct list_head rb_all; 383 384 unsigned long rb_sc_head; 385 unsigned long rb_sc_tail; 386 unsigned long rb_sc_last; 387 struct rpcrdma_sendctx **rb_sc_ctxs; 388 389 spinlock_t rb_lock; /* protect buf lists */ 390 struct list_head rb_send_bufs; 391 struct list_head rb_recv_bufs; 392 struct list_head rb_allreqs; 393 394 unsigned long rb_flags; 395 u32 rb_max_requests; 396 u32 rb_credits; /* most recent credit grant */ 397 398 u32 rb_bc_srv_max_requests; 399 u32 rb_bc_max_requests; 400 401 struct workqueue_struct *rb_completion_wq; 402 struct delayed_work rb_refresh_worker; 403 }; 404 405 /* rb_flags */ 406 enum { 407 RPCRDMA_BUF_F_EMPTY_SCQ = 0, 408 }; 409 410 /* 411 * Statistics for RPCRDMA 412 */ 413 struct rpcrdma_stats { 414 /* accessed when sending a call */ 415 unsigned long read_chunk_count; 416 unsigned long write_chunk_count; 417 unsigned long reply_chunk_count; 418 unsigned long long total_rdma_request; 419 420 /* rarely accessed error counters */ 421 unsigned long long pullup_copy_count; 422 unsigned long hardway_register_count; 423 unsigned long failed_marshal_count; 424 unsigned long bad_reply_count; 425 unsigned long mrs_recycled; 426 unsigned long mrs_orphaned; 427 unsigned long mrs_allocated; 428 unsigned long empty_sendctx_q; 429 430 /* accessed when receiving a reply */ 431 unsigned long long total_rdma_reply; 432 unsigned long long fixup_copy_count; 433 unsigned long reply_waits_for_send; 434 unsigned long local_inv_needed; 435 unsigned long nomsg_call_count; 436 unsigned long bcall_count; 437 }; 438 439 /* 440 * RPCRDMA transport -- encapsulates the structures above for 441 * integration with RPC. 442 * 443 * The contained structures are embedded, not pointers, 444 * for convenience. This structure need not be visible externally. 445 * 446 * It is allocated and initialized during mount, and released 447 * during unmount. 448 */ 449 struct rpcrdma_xprt { 450 struct rpc_xprt rx_xprt; 451 struct rpcrdma_ia rx_ia; 452 struct rpcrdma_ep rx_ep; 453 struct rpcrdma_buffer rx_buf; 454 struct delayed_work rx_connect_worker; 455 struct rpcrdma_stats rx_stats; 456 }; 457 458 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 459 460 static inline const char * 461 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 462 { 463 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 464 } 465 466 static inline const char * 467 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 468 { 469 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 470 } 471 472 /* Setting this to 0 ensures interoperability with early servers. 473 * Setting this to 1 enhances certain unaligned read/write performance. 474 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 475 extern int xprt_rdma_pad_optimize; 476 477 /* This setting controls the hunt for a supported memory 478 * registration strategy. 479 */ 480 extern unsigned int xprt_rdma_memreg_strategy; 481 482 /* 483 * Interface Adapter calls - xprtrdma/verbs.c 484 */ 485 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt); 486 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 487 void rpcrdma_ia_close(struct rpcrdma_ia *); 488 489 /* 490 * Endpoint calls - xprtrdma/verbs.c 491 */ 492 int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt); 493 void rpcrdma_ep_destroy(struct rpcrdma_xprt *r_xprt); 494 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 495 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 496 497 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 498 struct rpcrdma_req *); 499 500 /* 501 * Buffer calls - xprtrdma/verbs.c 502 */ 503 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size, 504 gfp_t flags); 505 void rpcrdma_req_destroy(struct rpcrdma_req *req); 506 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 507 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 508 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt); 509 510 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 511 void rpcrdma_mr_put(struct rpcrdma_mr *mr); 512 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr); 513 514 static inline void 515 rpcrdma_mr_recycle(struct rpcrdma_mr *mr) 516 { 517 schedule_work(&mr->mr_recycle); 518 } 519 520 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 521 void rpcrdma_buffer_put(struct rpcrdma_req *); 522 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 523 524 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, 525 gfp_t flags); 526 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 527 struct rpcrdma_regbuf *rb); 528 529 /** 530 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped 531 * 532 * Returns true if the buffer is now mapped to rb->rg_device. 533 */ 534 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 535 { 536 return rb->rg_device != NULL; 537 } 538 539 /** 540 * rpcrdma_regbuf_dma_map - DMA-map a regbuf 541 * @r_xprt: controlling transport instance 542 * @rb: regbuf to be mapped 543 * 544 * Returns true if the buffer is currently DMA mapped. 545 */ 546 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 547 struct rpcrdma_regbuf *rb) 548 { 549 if (likely(rpcrdma_regbuf_is_mapped(rb))) 550 return true; 551 return __rpcrdma_regbuf_dma_map(r_xprt, rb); 552 } 553 554 /* 555 * Wrappers for chunk registration, shared by read/write chunk code. 556 */ 557 558 static inline enum dma_data_direction 559 rpcrdma_data_dir(bool writing) 560 { 561 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 562 } 563 564 /* Memory registration calls xprtrdma/frwr_ops.c 565 */ 566 bool frwr_is_supported(struct ib_device *device); 567 int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep); 568 int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr); 569 void frwr_release_mr(struct rpcrdma_mr *mr); 570 size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt); 571 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, 572 struct rpcrdma_mr_seg *seg, 573 int nsegs, bool writing, __be32 xid, 574 struct rpcrdma_mr **mr); 575 int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req); 576 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); 577 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, 578 struct list_head *mrs); 579 580 /* 581 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 582 */ 583 584 enum rpcrdma_chunktype { 585 rpcrdma_noch = 0, 586 rpcrdma_readch, 587 rpcrdma_areadch, 588 rpcrdma_writech, 589 rpcrdma_replych 590 }; 591 592 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 593 struct rpcrdma_req *req, u32 hdrlen, 594 struct xdr_buf *xdr, 595 enum rpcrdma_chunktype rtype); 596 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc); 597 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 598 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 599 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 600 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 601 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, 602 struct rpcrdma_req *req); 603 void rpcrdma_deferred_completion(struct work_struct *work); 604 605 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 606 { 607 xdr->head[0].iov_len = len; 608 xdr->len = len; 609 } 610 611 /* RPC/RDMA module init - xprtrdma/transport.c 612 */ 613 extern unsigned int xprt_rdma_slot_table_entries; 614 extern unsigned int xprt_rdma_max_inline_read; 615 extern unsigned int xprt_rdma_max_inline_write; 616 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 617 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 618 void xprt_rdma_close(struct rpc_xprt *xprt); 619 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 620 int xprt_rdma_init(void); 621 void xprt_rdma_cleanup(void); 622 623 /* Backchannel calls - xprtrdma/backchannel.c 624 */ 625 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 626 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 627 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 628 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 629 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 630 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 631 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 632 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 633 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 634 635 extern struct xprt_class xprt_rdma_bc; 636 637 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 638