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 const struct rpcrdma_memreg_ops *ri_ops; 70 struct ib_device *ri_device; 71 struct rdma_cm_id *ri_id; 72 struct ib_pd *ri_pd; 73 struct completion ri_done; 74 struct completion ri_remove_done; 75 int ri_async_rc; 76 unsigned int ri_max_segs; 77 unsigned int ri_max_frwr_depth; 78 unsigned int ri_max_inline_write; 79 unsigned int ri_max_inline_read; 80 unsigned int ri_max_send_sges; 81 bool ri_implicit_roundup; 82 enum ib_mr_type ri_mrtype; 83 unsigned long ri_flags; 84 struct ib_qp_attr ri_qp_attr; 85 struct ib_qp_init_attr ri_qp_init_attr; 86 }; 87 88 enum { 89 RPCRDMA_IAF_REMOVING = 0, 90 }; 91 92 /* 93 * RDMA Endpoint -- one per transport instance 94 */ 95 96 struct rpcrdma_ep { 97 unsigned int rep_send_count; 98 unsigned int rep_send_batch; 99 int rep_connected; 100 struct ib_qp_init_attr rep_attr; 101 wait_queue_head_t rep_connect_wait; 102 struct rpcrdma_connect_private rep_cm_private; 103 struct rdma_conn_param rep_remote_cma; 104 struct delayed_work rep_connect_worker; 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. 110 */ 111 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 112 #define RPCRDMA_BACKWARD_WRS (8) 113 #else 114 #define RPCRDMA_BACKWARD_WRS (0) 115 #endif 116 117 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 118 * 119 * The below structure appears at the front of a large region of kmalloc'd 120 * memory, which always starts on a good alignment boundary. 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 __be32 rg_base[0] __attribute__ ((aligned(256))); 128 }; 129 130 static inline u64 131 rdmab_addr(struct rpcrdma_regbuf *rb) 132 { 133 return rb->rg_iov.addr; 134 } 135 136 static inline u32 137 rdmab_length(struct rpcrdma_regbuf *rb) 138 { 139 return rb->rg_iov.length; 140 } 141 142 static inline u32 143 rdmab_lkey(struct rpcrdma_regbuf *rb) 144 { 145 return rb->rg_iov.lkey; 146 } 147 148 static inline struct ib_device * 149 rdmab_device(struct rpcrdma_regbuf *rb) 150 { 151 return rb->rg_device; 152 } 153 154 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 155 156 /* To ensure a transport can always make forward progress, 157 * the number of RDMA segments allowed in header chunk lists 158 * is capped at 8. This prevents less-capable devices and 159 * memory registrations from overrunning the Send buffer 160 * while building chunk lists. 161 * 162 * Elements of the Read list take up more room than the 163 * Write list or Reply chunk. 8 read segments means the Read 164 * list (or Write list or Reply chunk) cannot consume more 165 * than 166 * 167 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 168 * 169 * And the fixed part of the header is another 24 bytes. 170 * 171 * The smallest inline threshold is 1024 bytes, ensuring that 172 * at least 750 bytes are available for RPC messages. 173 */ 174 enum { 175 RPCRDMA_MAX_HDR_SEGS = 8, 176 RPCRDMA_HDRBUF_SIZE = 256, 177 }; 178 179 /* 180 * struct rpcrdma_rep -- this structure encapsulates state required 181 * to receive and complete an RPC Reply, asychronously. It needs 182 * several pieces of state: 183 * 184 * o receive buffer and ib_sge (donated to provider) 185 * o status of receive (success or not, length, inv rkey) 186 * o bookkeeping state to get run by reply handler (XDR stream) 187 * 188 * These structures are allocated during transport initialization. 189 * N of these are associated with a transport instance, managed by 190 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 191 */ 192 193 struct rpcrdma_rep { 194 struct ib_cqe rr_cqe; 195 __be32 rr_xid; 196 __be32 rr_vers; 197 __be32 rr_proc; 198 int rr_wc_flags; 199 u32 rr_inv_rkey; 200 bool rr_temp; 201 struct rpcrdma_regbuf *rr_rdmabuf; 202 struct rpcrdma_xprt *rr_rxprt; 203 struct work_struct rr_work; 204 struct xdr_buf rr_hdrbuf; 205 struct xdr_stream rr_stream; 206 struct rpc_rqst *rr_rqst; 207 struct list_head rr_list; 208 struct ib_recv_wr rr_recv_wr; 209 }; 210 211 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes 212 */ 213 struct rpcrdma_req; 214 struct rpcrdma_xprt; 215 struct rpcrdma_sendctx { 216 struct ib_send_wr sc_wr; 217 struct ib_cqe sc_cqe; 218 struct rpcrdma_xprt *sc_xprt; 219 struct rpcrdma_req *sc_req; 220 unsigned int sc_unmap_count; 221 struct ib_sge sc_sges[]; 222 }; 223 224 /* Limit the number of SGEs that can be unmapped during one 225 * Send completion. This caps the amount of work a single 226 * completion can do before returning to the provider. 227 * 228 * Setting this to zero disables Send completion batching. 229 */ 230 enum { 231 RPCRDMA_MAX_SEND_BATCH = 7, 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 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mrs. During 241 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in 242 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep 243 * track of registration metadata while each RPC is pending. 244 * rpcrdma_deregister_external() uses this metadata to unmap and 245 * release these resources when an RPC is complete. 246 */ 247 enum rpcrdma_frwr_state { 248 FRWR_IS_INVALID, /* ready to be used */ 249 FRWR_IS_VALID, /* in use */ 250 FRWR_FLUSHED_FR, /* flushed FASTREG WR */ 251 FRWR_FLUSHED_LI, /* flushed LOCALINV WR */ 252 }; 253 254 struct rpcrdma_frwr { 255 struct ib_mr *fr_mr; 256 struct ib_cqe fr_cqe; 257 enum rpcrdma_frwr_state fr_state; 258 struct completion fr_linv_done; 259 union { 260 struct ib_reg_wr fr_regwr; 261 struct ib_send_wr fr_invwr; 262 }; 263 }; 264 265 struct rpcrdma_fmr { 266 struct ib_fmr *fm_mr; 267 u64 *fm_physaddrs; 268 }; 269 270 struct rpcrdma_mr { 271 struct list_head mr_list; 272 struct scatterlist *mr_sg; 273 int mr_nents; 274 enum dma_data_direction mr_dir; 275 union { 276 struct rpcrdma_fmr fmr; 277 struct rpcrdma_frwr frwr; 278 }; 279 struct rpcrdma_xprt *mr_xprt; 280 u32 mr_handle; 281 u32 mr_length; 282 u64 mr_offset; 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 unsigned long rb_flags; 404 u32 rb_max_requests; 405 u32 rb_credits; /* most recent credit grant */ 406 int rb_posted_receives; 407 408 u32 rb_bc_srv_max_requests; 409 spinlock_t rb_reqslock; /* protect rb_allreqs */ 410 struct list_head rb_allreqs; 411 412 u32 rb_bc_max_requests; 413 414 spinlock_t rb_recovery_lock; /* protect rb_stale_mrs */ 415 struct list_head rb_stale_mrs; 416 struct delayed_work rb_recovery_worker; 417 struct delayed_work rb_refresh_worker; 418 }; 419 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) 420 421 /* rb_flags */ 422 enum { 423 RPCRDMA_BUF_F_EMPTY_SCQ = 0, 424 }; 425 426 /* 427 * Internal structure for transport instance creation. This 428 * exists primarily for modularity. 429 * 430 * This data should be set with mount options 431 */ 432 struct rpcrdma_create_data_internal { 433 unsigned int max_requests; /* max requests (slots) in flight */ 434 unsigned int rsize; /* mount rsize - max read hdr+data */ 435 unsigned int wsize; /* mount wsize - max write hdr+data */ 436 unsigned int inline_rsize; /* max non-rdma read data payload */ 437 unsigned int inline_wsize; /* max non-rdma write data payload */ 438 }; 439 440 /* 441 * Statistics for RPCRDMA 442 */ 443 struct rpcrdma_stats { 444 /* accessed when sending a call */ 445 unsigned long read_chunk_count; 446 unsigned long write_chunk_count; 447 unsigned long reply_chunk_count; 448 unsigned long long total_rdma_request; 449 450 /* rarely accessed error counters */ 451 unsigned long long pullup_copy_count; 452 unsigned long hardway_register_count; 453 unsigned long failed_marshal_count; 454 unsigned long bad_reply_count; 455 unsigned long mrs_recovered; 456 unsigned long mrs_orphaned; 457 unsigned long mrs_allocated; 458 unsigned long empty_sendctx_q; 459 460 /* accessed when receiving a reply */ 461 unsigned long long total_rdma_reply; 462 unsigned long long fixup_copy_count; 463 unsigned long reply_waits_for_send; 464 unsigned long local_inv_needed; 465 unsigned long nomsg_call_count; 466 unsigned long bcall_count; 467 }; 468 469 /* 470 * Per-registration mode operations 471 */ 472 struct rpcrdma_xprt; 473 struct rpcrdma_memreg_ops { 474 struct rpcrdma_mr_seg * 475 (*ro_map)(struct rpcrdma_xprt *, 476 struct rpcrdma_mr_seg *, int, bool, 477 struct rpcrdma_mr **); 478 int (*ro_send)(struct rpcrdma_ia *ia, 479 struct rpcrdma_req *req); 480 void (*ro_reminv)(struct rpcrdma_rep *rep, 481 struct list_head *mrs); 482 void (*ro_unmap_sync)(struct rpcrdma_xprt *, 483 struct list_head *); 484 void (*ro_recover_mr)(struct rpcrdma_mr *mr); 485 int (*ro_open)(struct rpcrdma_ia *, 486 struct rpcrdma_ep *, 487 struct rpcrdma_create_data_internal *); 488 size_t (*ro_maxpages)(struct rpcrdma_xprt *); 489 int (*ro_init_mr)(struct rpcrdma_ia *, 490 struct rpcrdma_mr *); 491 void (*ro_release_mr)(struct rpcrdma_mr *mr); 492 const char *ro_displayname; 493 const int ro_send_w_inv_ok; 494 }; 495 496 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; 497 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; 498 499 /* 500 * RPCRDMA transport -- encapsulates the structures above for 501 * integration with RPC. 502 * 503 * The contained structures are embedded, not pointers, 504 * for convenience. This structure need not be visible externally. 505 * 506 * It is allocated and initialized during mount, and released 507 * during unmount. 508 */ 509 struct rpcrdma_xprt { 510 struct rpc_xprt rx_xprt; 511 struct rpcrdma_ia rx_ia; 512 struct rpcrdma_ep rx_ep; 513 struct rpcrdma_buffer rx_buf; 514 struct rpcrdma_create_data_internal rx_data; 515 struct delayed_work rx_connect_worker; 516 struct rpcrdma_stats rx_stats; 517 }; 518 519 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 520 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 521 522 static inline const char * 523 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 524 { 525 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 526 } 527 528 static inline const char * 529 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 530 { 531 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 532 } 533 534 /* Setting this to 0 ensures interoperability with early servers. 535 * Setting this to 1 enhances certain unaligned read/write performance. 536 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 537 extern int xprt_rdma_pad_optimize; 538 539 /* This setting controls the hunt for a supported memory 540 * registration strategy. 541 */ 542 extern unsigned int xprt_rdma_memreg_strategy; 543 544 /* 545 * Interface Adapter calls - xprtrdma/verbs.c 546 */ 547 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt); 548 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 549 void rpcrdma_ia_close(struct rpcrdma_ia *); 550 bool frwr_is_supported(struct rpcrdma_ia *); 551 bool fmr_is_supported(struct rpcrdma_ia *); 552 553 extern struct workqueue_struct *rpcrdma_receive_wq; 554 555 /* 556 * Endpoint calls - xprtrdma/verbs.c 557 */ 558 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 559 struct rpcrdma_create_data_internal *); 560 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 561 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 562 void rpcrdma_conn_func(struct rpcrdma_ep *ep); 563 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 564 565 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 566 struct rpcrdma_req *); 567 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp); 568 569 /* 570 * Buffer calls - xprtrdma/verbs.c 571 */ 572 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 573 void rpcrdma_destroy_req(struct rpcrdma_req *); 574 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 575 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 576 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf); 577 578 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 579 void rpcrdma_mr_put(struct rpcrdma_mr *mr); 580 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr); 581 void rpcrdma_mr_defer_recovery(struct rpcrdma_mr *mr); 582 583 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 584 void rpcrdma_buffer_put(struct rpcrdma_req *); 585 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 586 587 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction, 588 gfp_t); 589 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); 590 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *); 591 592 static inline bool 593 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 594 { 595 return rb->rg_device != NULL; 596 } 597 598 static inline bool 599 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) 600 { 601 if (likely(rpcrdma_regbuf_is_mapped(rb))) 602 return true; 603 return __rpcrdma_dma_map_regbuf(ia, rb); 604 } 605 606 int rpcrdma_alloc_wq(void); 607 void rpcrdma_destroy_wq(void); 608 609 /* 610 * Wrappers for chunk registration, shared by read/write chunk code. 611 */ 612 613 static inline enum dma_data_direction 614 rpcrdma_data_dir(bool writing) 615 { 616 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 617 } 618 619 /* 620 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 621 */ 622 623 enum rpcrdma_chunktype { 624 rpcrdma_noch = 0, 625 rpcrdma_readch, 626 rpcrdma_areadch, 627 rpcrdma_writech, 628 rpcrdma_replych 629 }; 630 631 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 632 struct rpcrdma_req *req, u32 hdrlen, 633 struct xdr_buf *xdr, 634 enum rpcrdma_chunktype rtype); 635 void rpcrdma_unmap_sendctx(struct rpcrdma_sendctx *sc); 636 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 637 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 638 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 639 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 640 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, 641 struct rpcrdma_req *req); 642 void rpcrdma_deferred_completion(struct work_struct *work); 643 644 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 645 { 646 xdr->head[0].iov_len = len; 647 xdr->len = len; 648 } 649 650 /* RPC/RDMA module init - xprtrdma/transport.c 651 */ 652 extern unsigned int xprt_rdma_max_inline_read; 653 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 654 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 655 void rpcrdma_connect_worker(struct work_struct *work); 656 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 657 int xprt_rdma_init(void); 658 void xprt_rdma_cleanup(void); 659 660 /* Backchannel calls - xprtrdma/backchannel.c 661 */ 662 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 663 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 664 int xprt_rdma_bc_up(struct svc_serv *, struct net *); 665 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 666 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 667 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 668 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 669 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 670 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 671 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 672 673 extern struct xprt_class xprt_rdma_bc; 674 675 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 676