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/kref.h> /* struct kref */ 49 #include <linux/workqueue.h> /* struct work_struct */ 50 51 #include <rdma/rdma_cm.h> /* RDMA connection api */ 52 #include <rdma/ib_verbs.h> /* RDMA verbs api */ 53 54 #include <linux/sunrpc/clnt.h> /* rpc_xprt */ 55 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ 56 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ 57 58 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ 59 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ 60 61 #define RPCRDMA_BIND_TO (60U * HZ) 62 #define RPCRDMA_INIT_REEST_TO (5U * HZ) 63 #define RPCRDMA_MAX_REEST_TO (30U * HZ) 64 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) 65 66 /* 67 * Interface Adapter -- one per transport instance 68 */ 69 struct rpcrdma_ia { 70 struct rdma_cm_id *ri_id; 71 struct ib_pd *ri_pd; 72 int ri_async_rc; 73 unsigned int ri_max_segs; 74 unsigned int ri_max_frwr_depth; 75 unsigned int ri_max_send_sges; 76 bool ri_implicit_roundup; 77 enum ib_mr_type ri_mrtype; 78 unsigned long ri_flags; 79 struct completion ri_done; 80 struct completion ri_remove_done; 81 }; 82 83 enum { 84 RPCRDMA_IAF_REMOVING = 0, 85 }; 86 87 /* 88 * RDMA Endpoint -- one per transport instance 89 */ 90 91 struct rpcrdma_ep { 92 unsigned int rep_send_count; 93 unsigned int rep_send_batch; 94 unsigned int rep_max_inline_send; 95 unsigned int rep_max_inline_recv; 96 int rep_connected; 97 struct ib_qp_init_attr rep_attr; 98 wait_queue_head_t rep_connect_wait; 99 struct rpcrdma_connect_private rep_cm_private; 100 struct rdma_conn_param rep_remote_cma; 101 unsigned int rep_max_requests; /* set by /proc */ 102 unsigned int rep_inline_send; /* negotiated */ 103 unsigned int rep_inline_recv; /* negotiated */ 104 int rep_receive_count; 105 }; 106 107 /* Pre-allocate extra Work Requests for handling backward receives 108 * and sends. This is a fixed value because the Work Queues are 109 * allocated when the forward channel is set up, long before the 110 * backchannel is provisioned. This value is two times 111 * NFS4_DEF_CB_SLOT_TABLE_SIZE. 112 */ 113 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 114 #define RPCRDMA_BACKWARD_WRS (32) 115 #else 116 #define RPCRDMA_BACKWARD_WRS (0) 117 #endif 118 119 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 120 * 121 * The below structure appears at the front of a large region of kmalloc'd 122 * memory, which always starts on a good alignment boundary. 123 */ 124 125 struct rpcrdma_regbuf { 126 struct ib_sge rg_iov; 127 struct ib_device *rg_device; 128 enum dma_data_direction rg_direction; 129 void *rg_data; 130 }; 131 132 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb) 133 { 134 return rb->rg_iov.addr; 135 } 136 137 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb) 138 { 139 return rb->rg_iov.length; 140 } 141 142 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb) 143 { 144 return rb->rg_iov.lkey; 145 } 146 147 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb) 148 { 149 return rb->rg_device; 150 } 151 152 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) 153 { 154 return rb->rg_data; 155 } 156 157 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 158 159 /* To ensure a transport can always make forward progress, 160 * the number of RDMA segments allowed in header chunk lists 161 * is capped at 8. This prevents less-capable devices and 162 * memory registrations from overrunning the Send buffer 163 * while building chunk lists. 164 * 165 * Elements of the Read list take up more room than the 166 * Write list or Reply chunk. 8 read segments means the Read 167 * list (or Write list or Reply chunk) cannot consume more 168 * than 169 * 170 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 171 * 172 * And the fixed part of the header is another 24 bytes. 173 * 174 * The smallest inline threshold is 1024 bytes, ensuring that 175 * at least 750 bytes are available for RPC messages. 176 */ 177 enum { 178 RPCRDMA_MAX_HDR_SEGS = 8, 179 RPCRDMA_HDRBUF_SIZE = 256, 180 }; 181 182 /* 183 * struct rpcrdma_rep -- this structure encapsulates state required 184 * to receive and complete an RPC Reply, asychronously. It needs 185 * several pieces of state: 186 * 187 * o receive buffer and ib_sge (donated to provider) 188 * o status of receive (success or not, length, inv rkey) 189 * o bookkeeping state to get run by reply handler (XDR stream) 190 * 191 * These structures are allocated during transport initialization. 192 * N of these are associated with a transport instance, managed by 193 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 194 */ 195 196 struct rpcrdma_rep { 197 struct ib_cqe rr_cqe; 198 __be32 rr_xid; 199 __be32 rr_vers; 200 __be32 rr_proc; 201 int rr_wc_flags; 202 u32 rr_inv_rkey; 203 bool rr_temp; 204 struct rpcrdma_regbuf *rr_rdmabuf; 205 struct rpcrdma_xprt *rr_rxprt; 206 struct rpc_rqst *rr_rqst; 207 struct xdr_buf rr_hdrbuf; 208 struct xdr_stream rr_stream; 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 struct rpcrdma_req; 244 struct rpcrdma_frwr { 245 struct ib_mr *fr_mr; 246 struct ib_cqe fr_cqe; 247 struct completion fr_linv_done; 248 struct rpcrdma_req *fr_req; 249 union { 250 struct ib_reg_wr fr_regwr; 251 struct ib_send_wr fr_invwr; 252 }; 253 }; 254 255 struct rpcrdma_mr { 256 struct list_head mr_list; 257 struct scatterlist *mr_sg; 258 int mr_nents; 259 enum dma_data_direction mr_dir; 260 struct rpcrdma_frwr frwr; 261 struct rpcrdma_xprt *mr_xprt; 262 u32 mr_handle; 263 u32 mr_length; 264 u64 mr_offset; 265 struct work_struct mr_recycle; 266 struct list_head mr_all; 267 }; 268 269 /* 270 * struct rpcrdma_req -- structure central to the request/reply sequence. 271 * 272 * N of these are associated with a transport instance, and stored in 273 * struct rpcrdma_buffer. N is the max number of outstanding requests. 274 * 275 * It includes pre-registered buffer memory for send AND recv. 276 * The recv buffer, however, is not owned by this structure, and 277 * is "donated" to the hardware when a recv is posted. When a 278 * reply is handled, the recv buffer used is given back to the 279 * struct rpcrdma_req associated with the request. 280 * 281 * In addition to the basic memory, this structure includes an array 282 * of iovs for send operations. The reason is that the iovs passed to 283 * ib_post_{send,recv} must not be modified until the work request 284 * completes. 285 */ 286 287 /* Maximum number of page-sized "segments" per chunk list to be 288 * registered or invalidated. Must handle a Reply chunk: 289 */ 290 enum { 291 RPCRDMA_MAX_IOV_SEGS = 3, 292 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 293 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 294 RPCRDMA_MAX_IOV_SEGS, 295 }; 296 297 struct rpcrdma_mr_seg { /* chunk descriptors */ 298 u32 mr_len; /* length of chunk or segment */ 299 struct page *mr_page; /* owning page, if any */ 300 char *mr_offset; /* kva if no page, else offset */ 301 }; 302 303 /* The Send SGE array is provisioned to send a maximum size 304 * inline request: 305 * - RPC-over-RDMA header 306 * - xdr_buf head iovec 307 * - RPCRDMA_MAX_INLINE bytes, in pages 308 * - xdr_buf tail iovec 309 * 310 * The actual number of array elements consumed by each RPC 311 * depends on the device's max_sge limit. 312 */ 313 enum { 314 RPCRDMA_MIN_SEND_SGES = 3, 315 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 316 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 317 }; 318 319 struct rpcrdma_buffer; 320 struct rpcrdma_req { 321 struct list_head rl_list; 322 struct rpc_rqst rl_slot; 323 struct rpcrdma_rep *rl_reply; 324 struct xdr_stream rl_stream; 325 struct xdr_buf rl_hdrbuf; 326 struct rpcrdma_sendctx *rl_sendctx; 327 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 328 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 329 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 330 331 struct list_head rl_all; 332 struct kref rl_kref; 333 334 struct list_head rl_registered; /* registered segments */ 335 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 336 }; 337 338 static inline struct rpcrdma_req * 339 rpcr_to_rdmar(const struct rpc_rqst *rqst) 340 { 341 return container_of(rqst, struct rpcrdma_req, rl_slot); 342 } 343 344 static inline void 345 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 346 { 347 list_add_tail(&mr->mr_list, list); 348 } 349 350 static inline struct rpcrdma_mr * 351 rpcrdma_mr_pop(struct list_head *list) 352 { 353 struct rpcrdma_mr *mr; 354 355 mr = list_first_entry(list, struct rpcrdma_mr, mr_list); 356 list_del_init(&mr->mr_list); 357 return mr; 358 } 359 360 /* 361 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 362 * inline requests/replies, and client/server credits. 363 * 364 * One of these is associated with a transport instance 365 */ 366 struct rpcrdma_buffer { 367 spinlock_t rb_mrlock; /* protect rb_mrs list */ 368 struct list_head rb_mrs; 369 struct list_head rb_all; 370 371 unsigned long rb_sc_head; 372 unsigned long rb_sc_tail; 373 unsigned long rb_sc_last; 374 struct rpcrdma_sendctx **rb_sc_ctxs; 375 376 spinlock_t rb_lock; /* protect buf lists */ 377 struct list_head rb_send_bufs; 378 struct list_head rb_recv_bufs; 379 struct list_head rb_allreqs; 380 381 u32 rb_max_requests; 382 u32 rb_credits; /* most recent credit grant */ 383 384 u32 rb_bc_srv_max_requests; 385 u32 rb_bc_max_requests; 386 387 struct delayed_work rb_refresh_worker; 388 }; 389 390 /* 391 * Statistics for RPCRDMA 392 */ 393 struct rpcrdma_stats { 394 /* accessed when sending a call */ 395 unsigned long read_chunk_count; 396 unsigned long write_chunk_count; 397 unsigned long reply_chunk_count; 398 unsigned long long total_rdma_request; 399 400 /* rarely accessed error counters */ 401 unsigned long long pullup_copy_count; 402 unsigned long hardway_register_count; 403 unsigned long failed_marshal_count; 404 unsigned long bad_reply_count; 405 unsigned long mrs_recycled; 406 unsigned long mrs_orphaned; 407 unsigned long mrs_allocated; 408 unsigned long empty_sendctx_q; 409 410 /* accessed when receiving a reply */ 411 unsigned long long total_rdma_reply; 412 unsigned long long fixup_copy_count; 413 unsigned long reply_waits_for_send; 414 unsigned long local_inv_needed; 415 unsigned long nomsg_call_count; 416 unsigned long bcall_count; 417 }; 418 419 /* 420 * RPCRDMA transport -- encapsulates the structures above for 421 * integration with RPC. 422 * 423 * The contained structures are embedded, not pointers, 424 * for convenience. This structure need not be visible externally. 425 * 426 * It is allocated and initialized during mount, and released 427 * during unmount. 428 */ 429 struct rpcrdma_xprt { 430 struct rpc_xprt rx_xprt; 431 struct rpcrdma_ia rx_ia; 432 struct rpcrdma_ep rx_ep; 433 struct rpcrdma_buffer rx_buf; 434 struct delayed_work rx_connect_worker; 435 struct rpc_timeout rx_timeout; 436 struct rpcrdma_stats rx_stats; 437 }; 438 439 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 440 441 static inline const char * 442 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 443 { 444 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 445 } 446 447 static inline const char * 448 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 449 { 450 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 451 } 452 453 /* Setting this to 0 ensures interoperability with early servers. 454 * Setting this to 1 enhances certain unaligned read/write performance. 455 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 456 extern int xprt_rdma_pad_optimize; 457 458 /* This setting controls the hunt for a supported memory 459 * registration strategy. 460 */ 461 extern unsigned int xprt_rdma_memreg_strategy; 462 463 /* 464 * Interface Adapter calls - xprtrdma/verbs.c 465 */ 466 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt); 467 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 468 void rpcrdma_ia_close(struct rpcrdma_ia *); 469 470 /* 471 * Endpoint calls - xprtrdma/verbs.c 472 */ 473 int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt); 474 void rpcrdma_ep_destroy(struct rpcrdma_xprt *r_xprt); 475 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 476 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 477 478 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 479 struct rpcrdma_req *); 480 481 /* 482 * Buffer calls - xprtrdma/verbs.c 483 */ 484 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size, 485 gfp_t flags); 486 void rpcrdma_req_destroy(struct rpcrdma_req *req); 487 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 488 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 489 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt); 490 491 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 492 void rpcrdma_mr_put(struct rpcrdma_mr *mr); 493 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr); 494 495 static inline void 496 rpcrdma_mr_recycle(struct rpcrdma_mr *mr) 497 { 498 schedule_work(&mr->mr_recycle); 499 } 500 501 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 502 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, 503 struct rpcrdma_req *req); 504 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 505 506 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, 507 gfp_t flags); 508 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 509 struct rpcrdma_regbuf *rb); 510 511 /** 512 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped 513 * 514 * Returns true if the buffer is now mapped to rb->rg_device. 515 */ 516 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 517 { 518 return rb->rg_device != NULL; 519 } 520 521 /** 522 * rpcrdma_regbuf_dma_map - DMA-map a regbuf 523 * @r_xprt: controlling transport instance 524 * @rb: regbuf to be mapped 525 * 526 * Returns true if the buffer is currently DMA mapped. 527 */ 528 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 529 struct rpcrdma_regbuf *rb) 530 { 531 if (likely(rpcrdma_regbuf_is_mapped(rb))) 532 return true; 533 return __rpcrdma_regbuf_dma_map(r_xprt, rb); 534 } 535 536 /* 537 * Wrappers for chunk registration, shared by read/write chunk code. 538 */ 539 540 static inline enum dma_data_direction 541 rpcrdma_data_dir(bool writing) 542 { 543 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 544 } 545 546 /* Memory registration calls xprtrdma/frwr_ops.c 547 */ 548 bool frwr_is_supported(struct ib_device *device); 549 void frwr_reset(struct rpcrdma_req *req); 550 int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep); 551 int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr); 552 void frwr_release_mr(struct rpcrdma_mr *mr); 553 size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt); 554 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, 555 struct rpcrdma_mr_seg *seg, 556 int nsegs, bool writing, __be32 xid, 557 struct rpcrdma_mr **mr); 558 int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req); 559 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); 560 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 561 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 562 563 /* 564 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 565 */ 566 567 enum rpcrdma_chunktype { 568 rpcrdma_noch = 0, 569 rpcrdma_readch, 570 rpcrdma_areadch, 571 rpcrdma_writech, 572 rpcrdma_replych 573 }; 574 575 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 576 struct rpcrdma_req *req, u32 hdrlen, 577 struct xdr_buf *xdr, 578 enum rpcrdma_chunktype rtype); 579 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc); 580 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 581 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 582 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 583 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 584 585 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 586 { 587 xdr->head[0].iov_len = len; 588 xdr->len = len; 589 } 590 591 /* RPC/RDMA module init - xprtrdma/transport.c 592 */ 593 extern unsigned int xprt_rdma_slot_table_entries; 594 extern unsigned int xprt_rdma_max_inline_read; 595 extern unsigned int xprt_rdma_max_inline_write; 596 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 597 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 598 void xprt_rdma_close(struct rpc_xprt *xprt); 599 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 600 int xprt_rdma_init(void); 601 void xprt_rdma_cleanup(void); 602 603 /* Backchannel calls - xprtrdma/backchannel.c 604 */ 605 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 606 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 607 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 608 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *); 609 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 610 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 611 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 612 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 613 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 614 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 615 616 extern struct xprt_class xprt_rdma_bc; 617 618 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 619