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 /* To reduce the rate at which a transport invokes ib_post_recv 209 * (and thus the hardware doorbell rate), xprtrdma posts Receive 210 * WRs in batches. 211 * 212 * Setting this to zero disables Receive post batching. 213 */ 214 enum { 215 RPCRDMA_MAX_RECV_BATCH = 7, 216 }; 217 218 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes 219 */ 220 struct rpcrdma_req; 221 struct rpcrdma_xprt; 222 struct rpcrdma_sendctx { 223 struct ib_send_wr sc_wr; 224 struct ib_cqe sc_cqe; 225 struct rpcrdma_xprt *sc_xprt; 226 struct rpcrdma_req *sc_req; 227 unsigned int sc_unmap_count; 228 struct ib_sge sc_sges[]; 229 }; 230 231 /* Limit the number of SGEs that can be unmapped during one 232 * Send completion. This caps the amount of work a single 233 * completion can do before returning to the provider. 234 * 235 * Setting this to zero disables Send completion batching. 236 */ 237 enum { 238 RPCRDMA_MAX_SEND_BATCH = 7, 239 }; 240 241 /* 242 * struct rpcrdma_mr - external memory region metadata 243 * 244 * An external memory region is any buffer or page that is registered 245 * on the fly (ie, not pre-registered). 246 * 247 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mrs. During 248 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in 249 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep 250 * track of registration metadata while each RPC is pending. 251 * rpcrdma_deregister_external() uses this metadata to unmap and 252 * release these resources when an RPC is complete. 253 */ 254 enum rpcrdma_frwr_state { 255 FRWR_IS_INVALID, /* ready to be used */ 256 FRWR_IS_VALID, /* in use */ 257 FRWR_FLUSHED_FR, /* flushed FASTREG WR */ 258 FRWR_FLUSHED_LI, /* flushed LOCALINV WR */ 259 }; 260 261 struct rpcrdma_frwr { 262 struct ib_mr *fr_mr; 263 struct ib_cqe fr_cqe; 264 enum rpcrdma_frwr_state fr_state; 265 struct completion fr_linv_done; 266 union { 267 struct ib_reg_wr fr_regwr; 268 struct ib_send_wr fr_invwr; 269 }; 270 }; 271 272 struct rpcrdma_mr { 273 struct list_head mr_list; 274 struct scatterlist *mr_sg; 275 int mr_nents; 276 enum dma_data_direction mr_dir; 277 struct rpcrdma_frwr frwr; 278 struct rpcrdma_xprt *mr_xprt; 279 u32 mr_handle; 280 u32 mr_length; 281 u64 mr_offset; 282 struct work_struct mr_recycle; 283 struct list_head mr_all; 284 }; 285 286 /* 287 * struct rpcrdma_req -- structure central to the request/reply sequence. 288 * 289 * N of these are associated with a transport instance, and stored in 290 * struct rpcrdma_buffer. N is the max number of outstanding requests. 291 * 292 * It includes pre-registered buffer memory for send AND recv. 293 * The recv buffer, however, is not owned by this structure, and 294 * is "donated" to the hardware when a recv is posted. When a 295 * reply is handled, the recv buffer used is given back to the 296 * struct rpcrdma_req associated with the request. 297 * 298 * In addition to the basic memory, this structure includes an array 299 * of iovs for send operations. The reason is that the iovs passed to 300 * ib_post_{send,recv} must not be modified until the work request 301 * completes. 302 */ 303 304 /* Maximum number of page-sized "segments" per chunk list to be 305 * registered or invalidated. Must handle a Reply chunk: 306 */ 307 enum { 308 RPCRDMA_MAX_IOV_SEGS = 3, 309 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 310 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 311 RPCRDMA_MAX_IOV_SEGS, 312 }; 313 314 struct rpcrdma_mr_seg { /* chunk descriptors */ 315 u32 mr_len; /* length of chunk or segment */ 316 struct page *mr_page; /* owning page, if any */ 317 char *mr_offset; /* kva if no page, else offset */ 318 }; 319 320 /* The Send SGE array is provisioned to send a maximum size 321 * inline request: 322 * - RPC-over-RDMA header 323 * - xdr_buf head iovec 324 * - RPCRDMA_MAX_INLINE bytes, in pages 325 * - xdr_buf tail iovec 326 * 327 * The actual number of array elements consumed by each RPC 328 * depends on the device's max_sge limit. 329 */ 330 enum { 331 RPCRDMA_MIN_SEND_SGES = 3, 332 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 333 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 334 }; 335 336 struct rpcrdma_buffer; 337 struct rpcrdma_req { 338 struct list_head rl_list; 339 struct rpc_rqst rl_slot; 340 struct rpcrdma_buffer *rl_buffer; 341 struct rpcrdma_rep *rl_reply; 342 struct xdr_stream rl_stream; 343 struct xdr_buf rl_hdrbuf; 344 struct rpcrdma_sendctx *rl_sendctx; 345 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 346 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 347 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 348 349 struct list_head rl_all; 350 unsigned long rl_flags; 351 352 struct list_head rl_registered; /* registered segments */ 353 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 354 }; 355 356 /* rl_flags */ 357 enum { 358 RPCRDMA_REQ_F_PENDING = 0, 359 RPCRDMA_REQ_F_TX_RESOURCES, 360 }; 361 362 static inline struct rpcrdma_req * 363 rpcr_to_rdmar(const struct rpc_rqst *rqst) 364 { 365 return container_of(rqst, struct rpcrdma_req, rl_slot); 366 } 367 368 static inline void 369 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 370 { 371 list_add_tail(&mr->mr_list, list); 372 } 373 374 static inline struct rpcrdma_mr * 375 rpcrdma_mr_pop(struct list_head *list) 376 { 377 struct rpcrdma_mr *mr; 378 379 mr = list_first_entry(list, struct rpcrdma_mr, mr_list); 380 list_del_init(&mr->mr_list); 381 return mr; 382 } 383 384 /* 385 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 386 * inline requests/replies, and client/server credits. 387 * 388 * One of these is associated with a transport instance 389 */ 390 struct rpcrdma_buffer { 391 spinlock_t rb_mrlock; /* protect rb_mrs list */ 392 struct list_head rb_mrs; 393 struct list_head rb_all; 394 395 unsigned long rb_sc_head; 396 unsigned long rb_sc_tail; 397 unsigned long rb_sc_last; 398 struct rpcrdma_sendctx **rb_sc_ctxs; 399 400 spinlock_t rb_lock; /* protect buf lists */ 401 struct list_head rb_send_bufs; 402 struct list_head rb_recv_bufs; 403 struct list_head rb_allreqs; 404 405 unsigned long rb_flags; 406 u32 rb_max_requests; 407 u32 rb_credits; /* most recent credit grant */ 408 409 u32 rb_bc_srv_max_requests; 410 u32 rb_bc_max_requests; 411 412 struct workqueue_struct *rb_completion_wq; 413 struct delayed_work rb_refresh_worker; 414 }; 415 416 /* rb_flags */ 417 enum { 418 RPCRDMA_BUF_F_EMPTY_SCQ = 0, 419 }; 420 421 /* 422 * Internal structure for transport instance creation. This 423 * exists primarily for modularity. 424 * 425 * This data should be set with mount options 426 */ 427 struct rpcrdma_create_data_internal { 428 unsigned int max_requests; /* max requests (slots) in flight */ 429 unsigned int rsize; /* mount rsize - max read hdr+data */ 430 unsigned int wsize; /* mount wsize - max write hdr+data */ 431 unsigned int inline_rsize; /* max non-rdma read data payload */ 432 unsigned int inline_wsize; /* max non-rdma write data payload */ 433 }; 434 435 /* 436 * Statistics for RPCRDMA 437 */ 438 struct rpcrdma_stats { 439 /* accessed when sending a call */ 440 unsigned long read_chunk_count; 441 unsigned long write_chunk_count; 442 unsigned long reply_chunk_count; 443 unsigned long long total_rdma_request; 444 445 /* rarely accessed error counters */ 446 unsigned long long pullup_copy_count; 447 unsigned long hardway_register_count; 448 unsigned long failed_marshal_count; 449 unsigned long bad_reply_count; 450 unsigned long mrs_recycled; 451 unsigned long mrs_orphaned; 452 unsigned long mrs_allocated; 453 unsigned long empty_sendctx_q; 454 455 /* accessed when receiving a reply */ 456 unsigned long long total_rdma_reply; 457 unsigned long long fixup_copy_count; 458 unsigned long reply_waits_for_send; 459 unsigned long local_inv_needed; 460 unsigned long nomsg_call_count; 461 unsigned long bcall_count; 462 }; 463 464 /* 465 * RPCRDMA transport -- encapsulates the structures above for 466 * integration with RPC. 467 * 468 * The contained structures are embedded, not pointers, 469 * for convenience. This structure need not be visible externally. 470 * 471 * It is allocated and initialized during mount, and released 472 * during unmount. 473 */ 474 struct rpcrdma_xprt { 475 struct rpc_xprt rx_xprt; 476 struct rpcrdma_ia rx_ia; 477 struct rpcrdma_ep rx_ep; 478 struct rpcrdma_buffer rx_buf; 479 struct rpcrdma_create_data_internal rx_data; 480 struct delayed_work rx_connect_worker; 481 struct rpcrdma_stats rx_stats; 482 }; 483 484 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 485 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 486 487 static inline const char * 488 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 489 { 490 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 491 } 492 493 static inline const char * 494 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 495 { 496 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 497 } 498 499 /* Setting this to 0 ensures interoperability with early servers. 500 * Setting this to 1 enhances certain unaligned read/write performance. 501 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 502 extern int xprt_rdma_pad_optimize; 503 504 /* This setting controls the hunt for a supported memory 505 * registration strategy. 506 */ 507 extern unsigned int xprt_rdma_memreg_strategy; 508 509 /* 510 * Interface Adapter calls - xprtrdma/verbs.c 511 */ 512 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt); 513 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 514 void rpcrdma_ia_close(struct rpcrdma_ia *); 515 516 /* 517 * Endpoint calls - xprtrdma/verbs.c 518 */ 519 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 520 struct rpcrdma_create_data_internal *); 521 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 522 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 523 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 524 525 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 526 struct rpcrdma_req *); 527 528 /* 529 * Buffer calls - xprtrdma/verbs.c 530 */ 531 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 532 void rpcrdma_req_destroy(struct rpcrdma_req *req); 533 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 534 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 535 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf); 536 537 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 538 void rpcrdma_mr_put(struct rpcrdma_mr *mr); 539 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr); 540 541 static inline void 542 rpcrdma_mr_recycle(struct rpcrdma_mr *mr) 543 { 544 schedule_work(&mr->mr_recycle); 545 } 546 547 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 548 void rpcrdma_buffer_put(struct rpcrdma_req *); 549 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 550 551 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction, 552 gfp_t); 553 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); 554 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *); 555 556 static inline bool 557 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 558 { 559 return rb->rg_device != NULL; 560 } 561 562 static inline bool 563 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) 564 { 565 if (likely(rpcrdma_regbuf_is_mapped(rb))) 566 return true; 567 return __rpcrdma_dma_map_regbuf(ia, rb); 568 } 569 570 /* 571 * Wrappers for chunk registration, shared by read/write chunk code. 572 */ 573 574 static inline enum dma_data_direction 575 rpcrdma_data_dir(bool writing) 576 { 577 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 578 } 579 580 /* Memory registration calls xprtrdma/frwr_ops.c 581 */ 582 bool frwr_is_supported(struct rpcrdma_ia *); 583 int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep, 584 struct rpcrdma_create_data_internal *cdata); 585 int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr); 586 void frwr_release_mr(struct rpcrdma_mr *mr); 587 size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt); 588 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, 589 struct rpcrdma_mr_seg *seg, 590 int nsegs, bool writing, __be32 xid, 591 struct rpcrdma_mr **mr); 592 int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req); 593 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); 594 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, 595 struct list_head *mrs); 596 597 /* 598 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 599 */ 600 601 enum rpcrdma_chunktype { 602 rpcrdma_noch = 0, 603 rpcrdma_readch, 604 rpcrdma_areadch, 605 rpcrdma_writech, 606 rpcrdma_replych 607 }; 608 609 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 610 struct rpcrdma_req *req, u32 hdrlen, 611 struct xdr_buf *xdr, 612 enum rpcrdma_chunktype rtype); 613 void rpcrdma_unmap_sendctx(struct rpcrdma_sendctx *sc); 614 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 615 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 616 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 617 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 618 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, 619 struct rpcrdma_req *req); 620 void rpcrdma_deferred_completion(struct work_struct *work); 621 622 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 623 { 624 xdr->head[0].iov_len = len; 625 xdr->len = len; 626 } 627 628 /* RPC/RDMA module init - xprtrdma/transport.c 629 */ 630 extern unsigned int xprt_rdma_max_inline_read; 631 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 632 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 633 void xprt_rdma_close(struct rpc_xprt *xprt); 634 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 635 int xprt_rdma_init(void); 636 void xprt_rdma_cleanup(void); 637 638 /* Backchannel calls - xprtrdma/backchannel.c 639 */ 640 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 641 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 642 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 643 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 644 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 645 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 646 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 647 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 648 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 649 650 extern struct xprt_class xprt_rdma_bc; 651 652 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 653