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 ib_device *ri_device; 70 struct rdma_cm_id *ri_id; 71 struct ib_pd *ri_pd; 72 struct completion ri_done; 73 struct completion ri_remove_done; 74 int ri_async_rc; 75 unsigned int ri_max_segs; 76 unsigned int ri_max_frwr_depth; 77 unsigned int ri_max_inline_write; 78 unsigned int ri_max_inline_read; 79 unsigned int ri_max_send_sges; 80 bool ri_implicit_roundup; 81 enum ib_mr_type ri_mrtype; 82 unsigned long ri_flags; 83 }; 84 85 enum { 86 RPCRDMA_IAF_REMOVING = 0, 87 }; 88 89 /* 90 * RDMA Endpoint -- one per transport instance 91 */ 92 93 struct rpcrdma_ep { 94 unsigned int rep_send_count; 95 unsigned int rep_send_batch; 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 int rep_receive_count; 102 }; 103 104 /* Pre-allocate extra Work Requests for handling backward receives 105 * and sends. This is a fixed value because the Work Queues are 106 * allocated when the forward channel is set up. 107 */ 108 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 109 #define RPCRDMA_BACKWARD_WRS (8) 110 #else 111 #define RPCRDMA_BACKWARD_WRS (0) 112 #endif 113 114 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 115 * 116 * The below structure appears at the front of a large region of kmalloc'd 117 * memory, which always starts on a good alignment boundary. 118 */ 119 120 struct rpcrdma_regbuf { 121 struct ib_sge rg_iov; 122 struct ib_device *rg_device; 123 enum dma_data_direction rg_direction; 124 __be32 rg_base[0] __attribute__ ((aligned(256))); 125 }; 126 127 static inline u64 128 rdmab_addr(struct rpcrdma_regbuf *rb) 129 { 130 return rb->rg_iov.addr; 131 } 132 133 static inline u32 134 rdmab_length(struct rpcrdma_regbuf *rb) 135 { 136 return rb->rg_iov.length; 137 } 138 139 static inline u32 140 rdmab_lkey(struct rpcrdma_regbuf *rb) 141 { 142 return rb->rg_iov.lkey; 143 } 144 145 static inline struct ib_device * 146 rdmab_device(struct rpcrdma_regbuf *rb) 147 { 148 return rb->rg_device; 149 } 150 151 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 152 153 /* To ensure a transport can always make forward progress, 154 * the number of RDMA segments allowed in header chunk lists 155 * is capped at 8. This prevents less-capable devices and 156 * memory registrations from overrunning the Send buffer 157 * while building chunk lists. 158 * 159 * Elements of the Read list take up more room than the 160 * Write list or Reply chunk. 8 read segments means the Read 161 * list (or Write list or Reply chunk) cannot consume more 162 * than 163 * 164 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 165 * 166 * And the fixed part of the header is another 24 bytes. 167 * 168 * The smallest inline threshold is 1024 bytes, ensuring that 169 * at least 750 bytes are available for RPC messages. 170 */ 171 enum { 172 RPCRDMA_MAX_HDR_SEGS = 8, 173 RPCRDMA_HDRBUF_SIZE = 256, 174 }; 175 176 /* 177 * struct rpcrdma_rep -- this structure encapsulates state required 178 * to receive and complete an RPC Reply, asychronously. It needs 179 * several pieces of state: 180 * 181 * o receive buffer and ib_sge (donated to provider) 182 * o status of receive (success or not, length, inv rkey) 183 * o bookkeeping state to get run by reply handler (XDR stream) 184 * 185 * These structures are allocated during transport initialization. 186 * N of these are associated with a transport instance, managed by 187 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 188 */ 189 190 struct rpcrdma_rep { 191 struct ib_cqe rr_cqe; 192 __be32 rr_xid; 193 __be32 rr_vers; 194 __be32 rr_proc; 195 int rr_wc_flags; 196 u32 rr_inv_rkey; 197 bool rr_temp; 198 struct rpcrdma_regbuf *rr_rdmabuf; 199 struct rpcrdma_xprt *rr_rxprt; 200 struct work_struct rr_work; 201 struct xdr_buf rr_hdrbuf; 202 struct xdr_stream rr_stream; 203 struct rpc_rqst *rr_rqst; 204 struct list_head rr_list; 205 struct ib_recv_wr rr_recv_wr; 206 }; 207 208 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes 209 */ 210 struct rpcrdma_req; 211 struct rpcrdma_xprt; 212 struct rpcrdma_sendctx { 213 struct ib_send_wr sc_wr; 214 struct ib_cqe sc_cqe; 215 struct rpcrdma_xprt *sc_xprt; 216 struct rpcrdma_req *sc_req; 217 unsigned int sc_unmap_count; 218 struct ib_sge sc_sges[]; 219 }; 220 221 /* Limit the number of SGEs that can be unmapped during one 222 * Send completion. This caps the amount of work a single 223 * completion can do before returning to the provider. 224 * 225 * Setting this to zero disables Send completion batching. 226 */ 227 enum { 228 RPCRDMA_MAX_SEND_BATCH = 7, 229 }; 230 231 /* 232 * struct rpcrdma_mr - external memory region metadata 233 * 234 * An external memory region is any buffer or page that is registered 235 * on the fly (ie, not pre-registered). 236 * 237 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mrs. During 238 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in 239 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep 240 * track of registration metadata while each RPC is pending. 241 * rpcrdma_deregister_external() uses this metadata to unmap and 242 * release these resources when an RPC is complete. 243 */ 244 enum rpcrdma_frwr_state { 245 FRWR_IS_INVALID, /* ready to be used */ 246 FRWR_IS_VALID, /* in use */ 247 FRWR_FLUSHED_FR, /* flushed FASTREG WR */ 248 FRWR_FLUSHED_LI, /* flushed LOCALINV WR */ 249 }; 250 251 struct rpcrdma_frwr { 252 struct ib_mr *fr_mr; 253 struct ib_cqe fr_cqe; 254 enum rpcrdma_frwr_state fr_state; 255 struct completion fr_linv_done; 256 union { 257 struct ib_reg_wr fr_regwr; 258 struct ib_send_wr fr_invwr; 259 }; 260 }; 261 262 struct rpcrdma_mr { 263 struct list_head mr_list; 264 struct scatterlist *mr_sg; 265 int mr_nents; 266 enum dma_data_direction mr_dir; 267 struct rpcrdma_frwr frwr; 268 struct rpcrdma_xprt *mr_xprt; 269 u32 mr_handle; 270 u32 mr_length; 271 u64 mr_offset; 272 struct work_struct mr_recycle; 273 struct list_head mr_all; 274 }; 275 276 /* 277 * struct rpcrdma_req -- structure central to the request/reply sequence. 278 * 279 * N of these are associated with a transport instance, and stored in 280 * struct rpcrdma_buffer. N is the max number of outstanding requests. 281 * 282 * It includes pre-registered buffer memory for send AND recv. 283 * The recv buffer, however, is not owned by this structure, and 284 * is "donated" to the hardware when a recv is posted. When a 285 * reply is handled, the recv buffer used is given back to the 286 * struct rpcrdma_req associated with the request. 287 * 288 * In addition to the basic memory, this structure includes an array 289 * of iovs for send operations. The reason is that the iovs passed to 290 * ib_post_{send,recv} must not be modified until the work request 291 * completes. 292 */ 293 294 /* Maximum number of page-sized "segments" per chunk list to be 295 * registered or invalidated. Must handle a Reply chunk: 296 */ 297 enum { 298 RPCRDMA_MAX_IOV_SEGS = 3, 299 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 300 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 301 RPCRDMA_MAX_IOV_SEGS, 302 }; 303 304 struct rpcrdma_mr_seg { /* chunk descriptors */ 305 u32 mr_len; /* length of chunk or segment */ 306 struct page *mr_page; /* owning page, if any */ 307 char *mr_offset; /* kva if no page, else offset */ 308 }; 309 310 /* The Send SGE array is provisioned to send a maximum size 311 * inline request: 312 * - RPC-over-RDMA header 313 * - xdr_buf head iovec 314 * - RPCRDMA_MAX_INLINE bytes, in pages 315 * - xdr_buf tail iovec 316 * 317 * The actual number of array elements consumed by each RPC 318 * depends on the device's max_sge limit. 319 */ 320 enum { 321 RPCRDMA_MIN_SEND_SGES = 3, 322 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 323 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 324 }; 325 326 struct rpcrdma_buffer; 327 struct rpcrdma_req { 328 struct list_head rl_list; 329 struct rpc_rqst rl_slot; 330 struct rpcrdma_buffer *rl_buffer; 331 struct rpcrdma_rep *rl_reply; 332 struct xdr_stream rl_stream; 333 struct xdr_buf rl_hdrbuf; 334 struct rpcrdma_sendctx *rl_sendctx; 335 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 336 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 337 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 338 339 struct list_head rl_all; 340 unsigned long rl_flags; 341 342 struct list_head rl_registered; /* registered segments */ 343 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 344 }; 345 346 /* rl_flags */ 347 enum { 348 RPCRDMA_REQ_F_PENDING = 0, 349 RPCRDMA_REQ_F_TX_RESOURCES, 350 }; 351 352 static inline struct rpcrdma_req * 353 rpcr_to_rdmar(const struct rpc_rqst *rqst) 354 { 355 return container_of(rqst, struct rpcrdma_req, rl_slot); 356 } 357 358 static inline void 359 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 360 { 361 list_add_tail(&mr->mr_list, list); 362 } 363 364 static inline struct rpcrdma_mr * 365 rpcrdma_mr_pop(struct list_head *list) 366 { 367 struct rpcrdma_mr *mr; 368 369 mr = list_first_entry(list, struct rpcrdma_mr, mr_list); 370 list_del_init(&mr->mr_list); 371 return mr; 372 } 373 374 /* 375 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 376 * inline requests/replies, and client/server credits. 377 * 378 * One of these is associated with a transport instance 379 */ 380 struct rpcrdma_buffer { 381 spinlock_t rb_mrlock; /* protect rb_mrs list */ 382 struct list_head rb_mrs; 383 struct list_head rb_all; 384 385 unsigned long rb_sc_head; 386 unsigned long rb_sc_tail; 387 unsigned long rb_sc_last; 388 struct rpcrdma_sendctx **rb_sc_ctxs; 389 390 spinlock_t rb_lock; /* protect buf lists */ 391 struct list_head rb_send_bufs; 392 struct list_head rb_recv_bufs; 393 struct list_head rb_allreqs; 394 395 unsigned long rb_flags; 396 u32 rb_max_requests; 397 u32 rb_credits; /* most recent credit grant */ 398 399 u32 rb_bc_srv_max_requests; 400 u32 rb_bc_max_requests; 401 402 struct workqueue_struct *rb_completion_wq; 403 struct delayed_work rb_refresh_worker; 404 }; 405 406 /* rb_flags */ 407 enum { 408 RPCRDMA_BUF_F_EMPTY_SCQ = 0, 409 }; 410 411 /* 412 * Internal structure for transport instance creation. This 413 * exists primarily for modularity. 414 * 415 * This data should be set with mount options 416 */ 417 struct rpcrdma_create_data_internal { 418 unsigned int max_requests; /* max requests (slots) in flight */ 419 unsigned int rsize; /* mount rsize - max read hdr+data */ 420 unsigned int wsize; /* mount wsize - max write hdr+data */ 421 unsigned int inline_rsize; /* max non-rdma read data payload */ 422 unsigned int inline_wsize; /* max non-rdma write data payload */ 423 }; 424 425 /* 426 * Statistics for RPCRDMA 427 */ 428 struct rpcrdma_stats { 429 /* accessed when sending a call */ 430 unsigned long read_chunk_count; 431 unsigned long write_chunk_count; 432 unsigned long reply_chunk_count; 433 unsigned long long total_rdma_request; 434 435 /* rarely accessed error counters */ 436 unsigned long long pullup_copy_count; 437 unsigned long hardway_register_count; 438 unsigned long failed_marshal_count; 439 unsigned long bad_reply_count; 440 unsigned long mrs_recycled; 441 unsigned long mrs_orphaned; 442 unsigned long mrs_allocated; 443 unsigned long empty_sendctx_q; 444 445 /* accessed when receiving a reply */ 446 unsigned long long total_rdma_reply; 447 unsigned long long fixup_copy_count; 448 unsigned long reply_waits_for_send; 449 unsigned long local_inv_needed; 450 unsigned long nomsg_call_count; 451 unsigned long bcall_count; 452 }; 453 454 /* 455 * RPCRDMA transport -- encapsulates the structures above for 456 * integration with RPC. 457 * 458 * The contained structures are embedded, not pointers, 459 * for convenience. This structure need not be visible externally. 460 * 461 * It is allocated and initialized during mount, and released 462 * during unmount. 463 */ 464 struct rpcrdma_xprt { 465 struct rpc_xprt rx_xprt; 466 struct rpcrdma_ia rx_ia; 467 struct rpcrdma_ep rx_ep; 468 struct rpcrdma_buffer rx_buf; 469 struct rpcrdma_create_data_internal rx_data; 470 struct delayed_work rx_connect_worker; 471 struct rpcrdma_stats rx_stats; 472 }; 473 474 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 475 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 476 477 static inline const char * 478 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 479 { 480 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 481 } 482 483 static inline const char * 484 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 485 { 486 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 487 } 488 489 /* Setting this to 0 ensures interoperability with early servers. 490 * Setting this to 1 enhances certain unaligned read/write performance. 491 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 492 extern int xprt_rdma_pad_optimize; 493 494 /* This setting controls the hunt for a supported memory 495 * registration strategy. 496 */ 497 extern unsigned int xprt_rdma_memreg_strategy; 498 499 /* 500 * Interface Adapter calls - xprtrdma/verbs.c 501 */ 502 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt); 503 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 504 void rpcrdma_ia_close(struct rpcrdma_ia *); 505 506 /* 507 * Endpoint calls - xprtrdma/verbs.c 508 */ 509 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 510 struct rpcrdma_create_data_internal *); 511 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 512 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 513 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 514 515 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 516 struct rpcrdma_req *); 517 518 /* 519 * Buffer calls - xprtrdma/verbs.c 520 */ 521 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 522 void rpcrdma_req_destroy(struct rpcrdma_req *req); 523 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 524 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 525 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf); 526 527 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 528 void rpcrdma_mr_put(struct rpcrdma_mr *mr); 529 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr); 530 531 static inline void 532 rpcrdma_mr_recycle(struct rpcrdma_mr *mr) 533 { 534 schedule_work(&mr->mr_recycle); 535 } 536 537 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 538 void rpcrdma_buffer_put(struct rpcrdma_req *); 539 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 540 541 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction, 542 gfp_t); 543 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); 544 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *); 545 546 static inline bool 547 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 548 { 549 return rb->rg_device != NULL; 550 } 551 552 static inline bool 553 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) 554 { 555 if (likely(rpcrdma_regbuf_is_mapped(rb))) 556 return true; 557 return __rpcrdma_dma_map_regbuf(ia, rb); 558 } 559 560 /* 561 * Wrappers for chunk registration, shared by read/write chunk code. 562 */ 563 564 static inline enum dma_data_direction 565 rpcrdma_data_dir(bool writing) 566 { 567 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 568 } 569 570 /* Memory registration calls xprtrdma/frwr_ops.c 571 */ 572 bool frwr_is_supported(struct rpcrdma_ia *); 573 int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep, 574 struct rpcrdma_create_data_internal *cdata); 575 int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr); 576 void frwr_release_mr(struct rpcrdma_mr *mr); 577 size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt); 578 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, 579 struct rpcrdma_mr_seg *seg, 580 int nsegs, bool writing, u32 xid, 581 struct rpcrdma_mr **mr); 582 int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req); 583 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); 584 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, 585 struct list_head *mrs); 586 587 /* 588 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 589 */ 590 591 enum rpcrdma_chunktype { 592 rpcrdma_noch = 0, 593 rpcrdma_readch, 594 rpcrdma_areadch, 595 rpcrdma_writech, 596 rpcrdma_replych 597 }; 598 599 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 600 struct rpcrdma_req *req, u32 hdrlen, 601 struct xdr_buf *xdr, 602 enum rpcrdma_chunktype rtype); 603 void rpcrdma_unmap_sendctx(struct rpcrdma_sendctx *sc); 604 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 605 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 606 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 607 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 608 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, 609 struct rpcrdma_req *req); 610 void rpcrdma_deferred_completion(struct work_struct *work); 611 612 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 613 { 614 xdr->head[0].iov_len = len; 615 xdr->len = len; 616 } 617 618 /* RPC/RDMA module init - xprtrdma/transport.c 619 */ 620 extern unsigned int xprt_rdma_max_inline_read; 621 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 622 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 623 void xprt_rdma_close(struct rpc_xprt *xprt); 624 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 625 int xprt_rdma_init(void); 626 void xprt_rdma_cleanup(void); 627 628 /* Backchannel calls - xprtrdma/backchannel.c 629 */ 630 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 631 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 632 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 633 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 634 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 635 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 636 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 637 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 638 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 639 640 extern struct xprt_class xprt_rdma_bc; 641 642 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 643