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 #include <linux/llist.h> 51 52 #include <rdma/rdma_cm.h> /* RDMA connection api */ 53 #include <rdma/ib_verbs.h> /* RDMA verbs api */ 54 55 #include <linux/sunrpc/clnt.h> /* rpc_xprt */ 56 #include <linux/sunrpc/rpc_rdma_cid.h> /* completion IDs */ 57 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ 58 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ 59 #include <linux/sunrpc/rdma_rn.h> /* removal notifications */ 60 61 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ 62 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ 63 64 #define RPCRDMA_BIND_TO (60U * HZ) 65 #define RPCRDMA_INIT_REEST_TO (5U * HZ) 66 #define RPCRDMA_MAX_REEST_TO (30U * HZ) 67 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) 68 69 /* 70 * RDMA Endpoint -- connection endpoint details 71 */ 72 struct rpcrdma_mr; 73 struct rpcrdma_ep { 74 struct kref re_kref; 75 struct rdma_cm_id *re_id; 76 struct ib_pd *re_pd; 77 unsigned int re_max_rdma_segs; 78 unsigned int re_max_fr_depth; 79 struct rpcrdma_mr *re_write_pad_mr; 80 enum ib_mr_type re_mrtype; 81 struct completion re_done; 82 unsigned int re_send_count; 83 unsigned int re_send_batch; 84 unsigned int re_max_inline_send; 85 unsigned int re_max_inline_recv; 86 int re_async_rc; 87 int re_connect_status; 88 atomic_t re_receiving; 89 atomic_t re_force_disconnect; 90 struct ib_qp_init_attr re_attr; 91 wait_queue_head_t re_connect_wait; 92 struct rpc_xprt *re_xprt; 93 struct rpcrdma_connect_private 94 re_cm_private; 95 struct rdma_conn_param re_remote_cma; 96 struct rpcrdma_notification re_rn; 97 int re_receive_count; 98 unsigned int re_max_requests; /* depends on device */ 99 unsigned int re_inline_send; /* negotiated */ 100 unsigned int re_inline_recv; /* negotiated */ 101 102 atomic_t re_completion_ids; 103 104 char re_write_pad[XDR_UNIT]; 105 }; 106 107 /* Pre-allocate extra Work Requests for handling reverse-direction 108 * Receives and Sends. This is a fixed value because the Work Queues 109 * are 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 */ 121 122 struct rpcrdma_regbuf { 123 struct ib_sge rg_iov; 124 struct ib_device *rg_device; 125 enum dma_data_direction rg_direction; 126 void *rg_data; 127 }; 128 rdmab_addr(struct rpcrdma_regbuf * rb)129 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb) 130 { 131 return rb->rg_iov.addr; 132 } 133 rdmab_length(struct rpcrdma_regbuf * rb)134 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb) 135 { 136 return rb->rg_iov.length; 137 } 138 rdmab_lkey(struct rpcrdma_regbuf * rb)139 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb) 140 { 141 return rb->rg_iov.lkey; 142 } 143 rdmab_device(struct rpcrdma_regbuf * rb)144 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb) 145 { 146 return rb->rg_device; 147 } 148 rdmab_data(const struct rpcrdma_regbuf * rb)149 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) 150 { 151 return rb->rg_data; 152 } 153 154 /* Do not use emergency memory reserves, and fail quickly if memory 155 * cannot be allocated easily. These flags may be used wherever there 156 * is robust logic to handle a failure to allocate. 157 */ 158 #define XPRTRDMA_GFP_FLAGS (__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) 159 160 /* To ensure a transport can always make forward progress, 161 * the number of RDMA segments allowed in header chunk lists 162 * is capped at 16. This prevents less-capable devices from 163 * overrunning the Send buffer while building chunk lists. 164 * 165 * Elements of the Read list take up more room than the 166 * Write list or Reply chunk. 16 read segments means the 167 * chunk lists cannot consume more than 168 * 169 * ((16 + 2) * read segment size) + 1 XDR words, 170 * 171 * or about 400 bytes. The fixed part of the header is 172 * another 24 bytes. Thus when the inline threshold is 173 * 1024 bytes, at least 600 bytes are available for RPC 174 * message bodies. 175 */ 176 enum { 177 RPCRDMA_MAX_HDR_SEGS = 16, 178 }; 179 180 /* 181 * struct rpcrdma_rep -- this structure encapsulates state required 182 * to receive and complete an RPC Reply, asychronously. It needs 183 * several pieces of state: 184 * 185 * o receive buffer and ib_sge (donated to provider) 186 * o status of receive (success or not, length, inv rkey) 187 * o bookkeeping state to get run by reply handler (XDR stream) 188 * 189 * These structures are allocated during transport initialization. 190 * N of these are associated with a transport instance, managed by 191 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 192 */ 193 194 struct rpcrdma_rep { 195 struct ib_cqe rr_cqe; 196 struct rpc_rdma_cid rr_cid; 197 198 __be32 rr_xid; 199 __be32 rr_vers; 200 __be32 rr_proc; 201 int rr_wc_flags; 202 u32 rr_inv_rkey; 203 struct rpcrdma_regbuf *rr_rdmabuf; 204 struct rpcrdma_xprt *rr_rxprt; 205 struct rpc_rqst *rr_rqst; 206 struct xdr_buf rr_hdrbuf; 207 struct xdr_stream rr_stream; 208 struct llist_node rr_node; 209 struct ib_recv_wr rr_recv_wr; 210 struct list_head rr_all; 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_sendctx { 227 struct ib_cqe sc_cqe; 228 struct rpc_rdma_cid sc_cid; 229 struct rpcrdma_req *sc_req; 230 unsigned int sc_unmap_count; 231 struct ib_sge sc_sges[]; 232 }; 233 234 /* 235 * struct rpcrdma_mr - external memory region metadata 236 * 237 * An external memory region is any buffer or page that is registered 238 * on the fly (ie, not pre-registered). 239 */ 240 struct rpcrdma_req; 241 struct rpcrdma_mr { 242 struct list_head mr_list; 243 struct rpcrdma_req *mr_req; 244 245 struct ib_mr *mr_ibmr; 246 struct ib_device *mr_device; 247 struct scatterlist *mr_sg; 248 int mr_nents; 249 enum dma_data_direction mr_dir; 250 struct ib_cqe mr_cqe; 251 struct completion mr_linv_done; 252 union { 253 struct ib_reg_wr mr_regwr; 254 struct ib_send_wr mr_invwr; 255 }; 256 struct rpcrdma_xprt *mr_xprt; 257 u32 mr_handle; 258 u32 mr_length; 259 u64 mr_offset; 260 struct list_head mr_all; 261 struct rpc_rdma_cid mr_cid; 262 }; 263 264 /* 265 * struct rpcrdma_req -- structure central to the request/reply sequence. 266 * 267 * N of these are associated with a transport instance, and stored in 268 * struct rpcrdma_buffer. N is the max number of outstanding requests. 269 * 270 * It includes pre-registered buffer memory for send AND recv. 271 * The recv buffer, however, is not owned by this structure, and 272 * is "donated" to the hardware when a recv is posted. When a 273 * reply is handled, the recv buffer used is given back to the 274 * struct rpcrdma_req associated with the request. 275 * 276 * In addition to the basic memory, this structure includes an array 277 * of iovs for send operations. The reason is that the iovs passed to 278 * ib_post_{send,recv} must not be modified until the work request 279 * completes. 280 */ 281 282 /* Maximum number of page-sized "segments" per chunk list to be 283 * registered or invalidated. Must handle a Reply chunk: 284 */ 285 enum { 286 RPCRDMA_MAX_IOV_SEGS = 3, 287 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 288 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 289 RPCRDMA_MAX_IOV_SEGS, 290 }; 291 292 /* Arguments for DMA mapping and registration */ 293 struct rpcrdma_mr_seg { 294 u32 mr_len; /* length of segment */ 295 struct page *mr_page; /* underlying struct page */ 296 u64 mr_offset; /* IN: page offset, OUT: iova */ 297 }; 298 299 /* The Send SGE array is provisioned to send a maximum size 300 * inline request: 301 * - RPC-over-RDMA header 302 * - xdr_buf head iovec 303 * - RPCRDMA_MAX_INLINE bytes, in pages 304 * - xdr_buf tail iovec 305 * 306 * The actual number of array elements consumed by each RPC 307 * depends on the device's max_sge limit. 308 */ 309 enum { 310 RPCRDMA_MIN_SEND_SGES = 3, 311 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 312 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 313 }; 314 315 struct rpcrdma_buffer; 316 struct rpcrdma_req { 317 struct list_head rl_list; 318 struct rpc_rqst rl_slot; 319 struct rpcrdma_rep *rl_reply; 320 struct xdr_stream rl_stream; 321 struct xdr_buf rl_hdrbuf; 322 struct ib_send_wr rl_wr; 323 struct rpcrdma_sendctx *rl_sendctx; 324 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 325 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 326 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 327 328 struct list_head rl_all; 329 struct kref rl_kref; 330 331 struct list_head rl_free_mrs; 332 struct list_head rl_registered; 333 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 334 }; 335 336 static inline struct rpcrdma_req * rpcr_to_rdmar(const struct rpc_rqst * rqst)337 rpcr_to_rdmar(const struct rpc_rqst *rqst) 338 { 339 return container_of(rqst, struct rpcrdma_req, rl_slot); 340 } 341 342 static inline void rpcrdma_mr_push(struct rpcrdma_mr * mr,struct list_head * list)343 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 344 { 345 list_add(&mr->mr_list, list); 346 } 347 348 static inline struct rpcrdma_mr * rpcrdma_mr_pop(struct list_head * list)349 rpcrdma_mr_pop(struct list_head *list) 350 { 351 struct rpcrdma_mr *mr; 352 353 mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list); 354 if (mr) 355 list_del_init(&mr->mr_list); 356 return mr; 357 } 358 359 /* 360 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 361 * inline requests/replies, and client/server credits. 362 * 363 * One of these is associated with a transport instance 364 */ 365 struct rpcrdma_buffer { 366 spinlock_t rb_lock; 367 struct list_head rb_send_bufs; 368 struct list_head rb_mrs; 369 370 unsigned long rb_sc_head; 371 unsigned long rb_sc_tail; 372 unsigned long rb_sc_last; 373 struct rpcrdma_sendctx **rb_sc_ctxs; 374 375 struct list_head rb_allreqs; 376 struct list_head rb_all_mrs; 377 struct list_head rb_all_reps; 378 379 struct llist_head rb_free_reps; 380 381 __be32 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 work_struct 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_ep *rx_ep; 432 struct rpcrdma_buffer rx_buf; 433 struct delayed_work rx_connect_worker; 434 struct rpc_timeout rx_timeout; 435 struct rpcrdma_stats rx_stats; 436 }; 437 438 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 439 440 static inline const char * rpcrdma_addrstr(const struct rpcrdma_xprt * r_xprt)441 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 442 { 443 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 444 } 445 446 static inline const char * rpcrdma_portstr(const struct rpcrdma_xprt * r_xprt)447 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 448 { 449 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 450 } 451 452 /* Setting this to 0 ensures interoperability with early servers. 453 * Setting this to 1 enhances certain unaligned read/write performance. 454 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 455 extern int xprt_rdma_pad_optimize; 456 457 /* This setting controls the hunt for a supported memory 458 * registration strategy. 459 */ 460 extern unsigned int xprt_rdma_memreg_strategy; 461 462 /* 463 * Endpoint calls - xprtrdma/verbs.c 464 */ 465 void rpcrdma_force_disconnect(struct rpcrdma_ep *ep); 466 void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc); 467 int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt); 468 void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt); 469 470 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed); 471 472 /* 473 * Buffer calls - xprtrdma/verbs.c 474 */ 475 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, 476 size_t size); 477 int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 478 void rpcrdma_req_destroy(struct rpcrdma_req *req); 479 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 480 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 481 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt); 482 483 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 484 void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt); 485 486 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 487 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, 488 struct rpcrdma_req *req); 489 void rpcrdma_rep_put(struct rpcrdma_buffer *buf, struct rpcrdma_rep *rep); 490 void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req); 491 492 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, 493 gfp_t flags); 494 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 495 struct rpcrdma_regbuf *rb); 496 497 /** 498 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped 499 * 500 * Returns true if the buffer is now mapped to rb->rg_device. 501 */ rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf * rb)502 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 503 { 504 return rb->rg_device != NULL; 505 } 506 507 /** 508 * rpcrdma_regbuf_dma_map - DMA-map a regbuf 509 * @r_xprt: controlling transport instance 510 * @rb: regbuf to be mapped 511 * 512 * Returns true if the buffer is currently DMA mapped. 513 */ rpcrdma_regbuf_dma_map(struct rpcrdma_xprt * r_xprt,struct rpcrdma_regbuf * rb)514 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 515 struct rpcrdma_regbuf *rb) 516 { 517 if (likely(rpcrdma_regbuf_is_mapped(rb))) 518 return true; 519 return __rpcrdma_regbuf_dma_map(r_xprt, rb); 520 } 521 522 /* 523 * Wrappers for chunk registration, shared by read/write chunk code. 524 */ 525 526 static inline enum dma_data_direction rpcrdma_data_dir(bool writing)527 rpcrdma_data_dir(bool writing) 528 { 529 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 530 } 531 532 /* Memory registration calls xprtrdma/frwr_ops.c 533 */ 534 void frwr_reset(struct rpcrdma_req *req); 535 int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device); 536 int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr); 537 void frwr_mr_release(struct rpcrdma_mr *mr); 538 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, 539 struct rpcrdma_mr_seg *seg, 540 int nsegs, bool writing, __be32 xid, 541 struct rpcrdma_mr *mr); 542 int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 543 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); 544 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 545 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 546 int frwr_wp_create(struct rpcrdma_xprt *r_xprt); 547 548 /* 549 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 550 */ 551 552 enum rpcrdma_chunktype { 553 rpcrdma_noch = 0, 554 rpcrdma_noch_pullup, 555 rpcrdma_noch_mapped, 556 rpcrdma_readch, 557 rpcrdma_areadch, 558 rpcrdma_writech, 559 rpcrdma_replych 560 }; 561 562 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 563 struct rpcrdma_req *req, u32 hdrlen, 564 struct xdr_buf *xdr, 565 enum rpcrdma_chunktype rtype); 566 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc); 567 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 568 void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep); 569 void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt); 570 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 571 void rpcrdma_unpin_rqst(struct rpcrdma_rep *rep); 572 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 573 rpcrdma_set_xdrlen(struct xdr_buf * xdr,size_t len)574 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 575 { 576 xdr->head[0].iov_len = len; 577 xdr->len = len; 578 } 579 580 /* RPC/RDMA module init - xprtrdma/transport.c 581 */ 582 extern unsigned int xprt_rdma_max_inline_read; 583 extern unsigned int xprt_rdma_max_inline_write; 584 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 585 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 586 void xprt_rdma_close(struct rpc_xprt *xprt); 587 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 588 int xprt_rdma_init(void); 589 void xprt_rdma_cleanup(void); 590 591 /* Backchannel calls - xprtrdma/backchannel.c 592 */ 593 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 594 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 595 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 596 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *); 597 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 598 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 599 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 600 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 601 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 602 603 extern struct xprt_class xprt_rdma_bc; 604 605 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 606