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_recv_batch; 100 unsigned int re_inline_send; /* negotiated */ 101 unsigned int re_inline_recv; /* negotiated */ 102 103 atomic_t re_completion_ids; 104 105 char re_write_pad[XDR_UNIT]; 106 }; 107 108 /* Pre-allocate extra Work Requests for handling reverse-direction 109 * Receives and Sends. This is a fixed value because the Work Queues 110 * are allocated when the forward channel is set up, long before the 111 * backchannel is provisioned. This value is two times 112 * NFS4_DEF_CB_SLOT_TABLE_SIZE. 113 */ 114 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 115 #define RPCRDMA_BACKWARD_WRS (32) 116 #else 117 #define RPCRDMA_BACKWARD_WRS (0) 118 #endif 119 120 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 121 */ 122 123 struct rpcrdma_regbuf { 124 struct ib_sge rg_iov; 125 struct ib_device *rg_device; 126 enum dma_data_direction rg_direction; 127 void *rg_data; 128 }; 129 130 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb) 131 { 132 return rb->rg_iov.addr; 133 } 134 135 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb) 136 { 137 return rb->rg_iov.length; 138 } 139 140 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb) 141 { 142 return rb->rg_iov.lkey; 143 } 144 145 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb) 146 { 147 return rb->rg_device; 148 } 149 150 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) 151 { 152 return rb->rg_data; 153 } 154 155 /* Do not use emergency memory reserves, and fail quickly if memory 156 * cannot be allocated easily. These flags may be used wherever there 157 * is robust logic to handle a failure to allocate. 158 */ 159 #define XPRTRDMA_GFP_FLAGS (__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) 160 161 /* To ensure a transport can always make forward progress, 162 * the number of RDMA segments allowed in header chunk lists 163 * is capped at 16. This prevents less-capable devices from 164 * overrunning the Send buffer while building chunk lists. 165 * 166 * Elements of the Read list take up more room than the 167 * Write list or Reply chunk. 16 read segments means the 168 * chunk lists cannot consume more than 169 * 170 * ((16 + 2) * read segment size) + 1 XDR words, 171 * 172 * or about 400 bytes. The fixed part of the header is 173 * another 24 bytes. Thus when the inline threshold is 174 * 1024 bytes, at least 600 bytes are available for RPC 175 * message bodies. 176 */ 177 enum { 178 RPCRDMA_MAX_HDR_SEGS = 16, 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 struct rpc_rdma_cid rr_cid; 198 199 __be32 rr_xid; 200 __be32 rr_vers; 201 __be32 rr_proc; 202 int rr_wc_flags; 203 u32 rr_inv_rkey; 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 llist_node rr_node; 210 struct ib_recv_wr rr_recv_wr; 211 struct list_head rr_all; 212 }; 213 214 /* To reduce the rate at which a transport invokes ib_post_recv 215 * (and thus the hardware doorbell rate), xprtrdma posts Receive 216 * WRs in batches. 217 * 218 * Setting this to zero disables Receive post batching. 219 */ 220 enum { 221 RPCRDMA_MAX_RECV_BATCH = 7, 222 }; 223 224 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes 225 */ 226 struct rpcrdma_req; 227 struct rpcrdma_sendctx { 228 struct ib_cqe sc_cqe; 229 struct rpc_rdma_cid sc_cid; 230 struct rpcrdma_req *sc_req; 231 unsigned int sc_unmap_count; 232 struct ib_sge sc_sges[]; 233 }; 234 235 /* 236 * struct rpcrdma_mr - external memory region metadata 237 * 238 * An external memory region is any buffer or page that is registered 239 * on the fly (ie, not pre-registered). 240 */ 241 struct rpcrdma_req; 242 struct rpcrdma_mr { 243 struct list_head mr_list; 244 struct rpcrdma_req *mr_req; 245 246 struct ib_mr *mr_ibmr; 247 struct ib_device *mr_device; 248 struct scatterlist *mr_sg; 249 int mr_nents; 250 enum dma_data_direction mr_dir; 251 struct ib_cqe mr_cqe; 252 struct completion mr_linv_done; 253 union { 254 struct ib_reg_wr mr_regwr; 255 struct ib_send_wr mr_invwr; 256 }; 257 struct rpcrdma_xprt *mr_xprt; 258 u32 mr_handle; 259 u32 mr_length; 260 u64 mr_offset; 261 struct list_head mr_all; 262 struct rpc_rdma_cid mr_cid; 263 }; 264 265 /* 266 * struct rpcrdma_req -- structure central to the request/reply sequence. 267 * 268 * N of these are associated with a transport instance, and stored in 269 * struct rpcrdma_buffer. N is the max number of outstanding requests. 270 * 271 * It includes pre-registered buffer memory for send AND recv. 272 * The recv buffer, however, is not owned by this structure, and 273 * is "donated" to the hardware when a recv is posted. When a 274 * reply is handled, the recv buffer used is given back to the 275 * struct rpcrdma_req associated with the request. 276 * 277 * In addition to the basic memory, this structure includes an array 278 * of iovs for send operations. The reason is that the iovs passed to 279 * ib_post_{send,recv} must not be modified until the work request 280 * completes. 281 */ 282 283 /* Maximum number of page-sized "segments" per chunk list to be 284 * registered or invalidated. Must handle a Reply chunk: 285 */ 286 enum { 287 RPCRDMA_MAX_IOV_SEGS = 3, /* head, page-boundary, tail */ 288 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 289 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 290 RPCRDMA_MAX_IOV_SEGS, 291 }; 292 293 /** 294 * struct rpcrdma_xdr_cursor - tracks position within an xdr_buf 295 * for iterative MR registration 296 * @xc_buf: the xdr_buf being iterated 297 * @xc_page_offset: byte offset into the page region consumed so far 298 * @xc_flags: combination of XC_* bits 299 * 300 * Each XC_*_DONE flag indicates that this region has no 301 * remaining MR registration work. That condition holds both when the region 302 * has already been registered by a prior frwr_map() call and 303 * when the region is excluded from this chunk type (pre-set 304 * at init time by rpcrdma_xdr_cursor_init()). frwr_map() 305 * treats the two cases identically: skip the region. 306 */ 307 struct rpcrdma_xdr_cursor { 308 const struct xdr_buf *xc_buf; 309 unsigned int xc_page_offset; 310 unsigned int xc_flags; 311 }; 312 313 #define XC_HEAD_DONE BIT(0) 314 #define XC_PAGES_DONE BIT(1) 315 #define XC_TAIL_DONE BIT(2) 316 317 /* The Send SGE array is provisioned to send a maximum size 318 * inline request: 319 * - RPC-over-RDMA header 320 * - xdr_buf head iovec 321 * - RPCRDMA_MAX_INLINE bytes, in pages 322 * - xdr_buf tail iovec 323 * 324 * The actual number of array elements consumed by each RPC 325 * depends on the device's max_sge limit. 326 */ 327 enum { 328 RPCRDMA_MIN_SEND_SGES = 3, 329 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 330 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 331 }; 332 333 struct rpcrdma_buffer; 334 struct rpcrdma_req { 335 struct llist_node rl_node; 336 struct rpc_rqst rl_slot; 337 struct rpcrdma_rep *rl_reply; 338 struct xdr_stream rl_stream; 339 struct xdr_buf rl_hdrbuf; 340 struct ib_send_wr rl_wr; 341 struct rpcrdma_sendctx *rl_sendctx; 342 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 343 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 344 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 345 346 struct list_head rl_all; 347 struct kref rl_kref; 348 349 struct list_head rl_free_mrs; 350 struct list_head rl_registered; 351 }; 352 353 static inline struct rpcrdma_req * 354 rpcr_to_rdmar(const struct rpc_rqst *rqst) 355 { 356 return container_of(rqst, struct rpcrdma_req, rl_slot); 357 } 358 359 static inline void 360 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 361 { 362 list_add(&mr->mr_list, list); 363 } 364 365 static inline struct rpcrdma_mr * 366 rpcrdma_mr_pop(struct list_head *list) 367 { 368 struct rpcrdma_mr *mr; 369 370 mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list); 371 if (mr) 372 list_del_init(&mr->mr_list); 373 return mr; 374 } 375 376 /* 377 * struct rpcrdma_buffer -- holds pre-registered memory for inline 378 * requests/replies, and client/server credits. 379 * 380 * One of these is associated with a transport instance 381 */ 382 struct rpcrdma_buffer { 383 spinlock_t rb_lock; 384 struct llist_head rb_send_bufs; 385 struct list_head rb_mrs; 386 387 unsigned long rb_sc_head; 388 unsigned long rb_sc_tail; 389 unsigned long rb_sc_last; 390 struct rpcrdma_sendctx **rb_sc_ctxs; 391 392 struct list_head rb_allreqs; 393 struct list_head rb_all_mrs; 394 struct list_head rb_all_reps; 395 396 struct llist_head rb_free_reps; 397 398 __be32 rb_max_requests; 399 u32 rb_credits; /* most recent credit grant */ 400 401 u32 rb_bc_srv_max_requests; 402 u32 rb_bc_max_requests; 403 404 struct work_struct rb_refresh_worker; 405 }; 406 407 /* 408 * Statistics for RPCRDMA 409 */ 410 struct rpcrdma_stats { 411 /* accessed when sending a call */ 412 unsigned long read_chunk_count; 413 unsigned long write_chunk_count; 414 unsigned long reply_chunk_count; 415 unsigned long long total_rdma_request; 416 417 /* rarely accessed error counters */ 418 unsigned long long pullup_copy_count; 419 unsigned long hardway_register_count; 420 unsigned long failed_marshal_count; 421 unsigned long bad_reply_count; 422 unsigned long mrs_recycled; 423 unsigned long mrs_orphaned; 424 unsigned long mrs_allocated; 425 unsigned long empty_sendctx_q; 426 427 /* accessed when receiving a reply */ 428 unsigned long long total_rdma_reply; 429 unsigned long long fixup_copy_count; 430 unsigned long local_inv_needed; 431 unsigned long nomsg_call_count; 432 unsigned long bcall_count; 433 }; 434 435 /* 436 * RPCRDMA transport -- encapsulates the structures above for 437 * integration with RPC. 438 * 439 * The contained structures are embedded, not pointers, 440 * for convenience. This structure need not be visible externally. 441 * 442 * It is allocated and initialized during mount, and released 443 * during unmount. 444 */ 445 struct rpcrdma_xprt { 446 struct rpc_xprt rx_xprt; 447 struct rpcrdma_ep *rx_ep; 448 struct rpcrdma_buffer rx_buf; 449 struct delayed_work rx_connect_worker; 450 struct rpc_timeout rx_timeout; 451 struct rpcrdma_stats rx_stats; 452 }; 453 454 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 455 456 static inline const char * 457 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 458 { 459 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 460 } 461 462 static inline const char * 463 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 464 { 465 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 466 } 467 468 /* Setting this to 0 ensures interoperability with early servers. 469 * Setting this to 1 enhances unaligned read/write performance. 470 * Default is 0, see sysctl entry and rpc_rdma.c */ 471 extern int xprt_rdma_pad_optimize; 472 473 /* This setting controls the hunt for a supported memory 474 * registration strategy. 475 */ 476 extern unsigned int xprt_rdma_memreg_strategy; 477 478 /* 479 * Endpoint calls - xprtrdma/verbs.c 480 */ 481 void rpcrdma_force_disconnect(struct rpcrdma_ep *ep); 482 void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc); 483 int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt); 484 void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt); 485 486 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed); 487 488 /* 489 * Buffer calls - xprtrdma/verbs.c 490 */ 491 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, 492 size_t size); 493 int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 494 void rpcrdma_req_destroy(struct rpcrdma_req *req); 495 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 496 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 497 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt); 498 void rpcrdma_sendctx_unget_locked(struct rpcrdma_xprt *r_xprt, 499 struct rpcrdma_sendctx *sc); 500 501 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 502 void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt); 503 504 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 505 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, 506 struct rpcrdma_req *req); 507 void rpcrdma_rep_put(struct rpcrdma_buffer *buf, struct rpcrdma_rep *rep); 508 void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req); 509 void rpcrdma_req_put(struct rpcrdma_req *req); 510 511 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, 512 gfp_t flags); 513 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 514 struct rpcrdma_regbuf *rb); 515 516 /** 517 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped 518 * 519 * Returns true if the buffer is now mapped to rb->rg_device. 520 */ 521 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 522 { 523 return rb->rg_device != NULL; 524 } 525 526 /** 527 * rpcrdma_regbuf_dma_map - DMA-map a regbuf 528 * @r_xprt: controlling transport instance 529 * @rb: regbuf to be mapped 530 * 531 * Returns true if the buffer is currently DMA mapped. 532 */ 533 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, 534 struct rpcrdma_regbuf *rb) 535 { 536 if (likely(rpcrdma_regbuf_is_mapped(rb))) 537 return true; 538 return __rpcrdma_regbuf_dma_map(r_xprt, rb); 539 } 540 541 /* 542 * Wrappers for chunk registration, shared by read/write chunk code. 543 */ 544 545 static inline enum dma_data_direction 546 rpcrdma_data_dir(bool writing) 547 { 548 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 549 } 550 551 /* Memory registration calls xprtrdma/frwr_ops.c 552 */ 553 void frwr_reset(struct rpcrdma_req *req); 554 int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device); 555 int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr); 556 void frwr_mr_release(struct rpcrdma_mr *mr); 557 int frwr_map(struct rpcrdma_xprt *r_xprt, 558 struct rpcrdma_xdr_cursor *cur, 559 bool writing, __be32 xid, 560 struct rpcrdma_mr *mr); 561 int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 562 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); 563 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 564 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); 565 int frwr_wp_create(struct rpcrdma_xprt *r_xprt); 566 567 /* 568 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 569 */ 570 571 enum rpcrdma_chunktype { 572 rpcrdma_noch = 0, 573 rpcrdma_noch_pullup, 574 rpcrdma_noch_mapped, 575 rpcrdma_readch, 576 rpcrdma_areadch, 577 rpcrdma_writech, 578 rpcrdma_replych 579 }; 580 581 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 582 struct rpcrdma_req *req, u32 hdrlen, 583 struct xdr_buf *xdr, 584 enum rpcrdma_chunktype rtype); 585 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc); 586 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 587 void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep); 588 void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt); 589 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 590 void rpcrdma_unpin_rqst(struct rpcrdma_rep *rep); 591 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 592 593 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 594 { 595 xdr->head[0].iov_len = len; 596 xdr->len = len; 597 } 598 599 /* RPC/RDMA module init - xprtrdma/transport.c 600 */ 601 extern unsigned int xprt_rdma_max_inline_read; 602 extern unsigned int xprt_rdma_max_inline_write; 603 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 604 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 605 void xprt_rdma_close(struct rpc_xprt *xprt); 606 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 607 int xprt_rdma_init(void); 608 void xprt_rdma_cleanup(void); 609 610 /* Backchannel calls - xprtrdma/backchannel.c 611 */ 612 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 613 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 614 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 615 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *); 616 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 617 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 618 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 619 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 620 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 621 622 extern struct xprt_class xprt_rdma_bc; 623 624 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 625