1 /* 2 * Copyright (c) 2014-2017 Oracle. All rights reserved. 3 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the BSD-type 9 * license below: 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 18 * Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials provided 21 * with the distribution. 22 * 23 * Neither the name of the Network Appliance, Inc. nor the names of 24 * its contributors may be used to endorse or promote products 25 * derived from this software without specific prior written 26 * permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H 42 #define _LINUX_SUNRPC_XPRT_RDMA_H 43 44 #include <linux/wait.h> /* wait_queue_head_t, etc */ 45 #include <linux/spinlock.h> /* spinlock_t, etc */ 46 #include <linux/atomic.h> /* atomic_t, etc */ 47 #include <linux/workqueue.h> /* struct work_struct */ 48 49 #include <rdma/rdma_cm.h> /* RDMA connection api */ 50 #include <rdma/ib_verbs.h> /* RDMA verbs api */ 51 52 #include <linux/sunrpc/clnt.h> /* rpc_xprt */ 53 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ 54 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ 55 56 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ 57 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ 58 59 #define RPCRDMA_BIND_TO (60U * HZ) 60 #define RPCRDMA_INIT_REEST_TO (5U * HZ) 61 #define RPCRDMA_MAX_REEST_TO (30U * HZ) 62 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) 63 64 /* 65 * Interface Adapter -- one per transport instance 66 */ 67 struct rpcrdma_ia { 68 const struct rpcrdma_memreg_ops *ri_ops; 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 struct ib_qp_attr ri_qp_attr; 84 struct ib_qp_init_attr ri_qp_init_attr; 85 }; 86 87 enum { 88 RPCRDMA_IAF_REMOVING = 0, 89 }; 90 91 /* 92 * RDMA Endpoint -- one per transport instance 93 */ 94 95 struct rpcrdma_ep { 96 unsigned int rep_send_count; 97 unsigned int rep_send_batch; 98 int rep_connected; 99 struct ib_qp_init_attr rep_attr; 100 wait_queue_head_t rep_connect_wait; 101 struct rpcrdma_connect_private rep_cm_private; 102 struct rdma_conn_param rep_remote_cma; 103 struct delayed_work rep_connect_worker; 104 }; 105 106 /* Pre-allocate extra Work Requests for handling backward receives 107 * and sends. This is a fixed value because the Work Queues are 108 * allocated when the forward channel is set up. 109 */ 110 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 111 #define RPCRDMA_BACKWARD_WRS (8) 112 #else 113 #define RPCRDMA_BACKWARD_WRS (0) 114 #endif 115 116 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 117 * 118 * The below structure appears at the front of a large region of kmalloc'd 119 * memory, which always starts on a good alignment boundary. 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 __be32 rg_base[0] __attribute__ ((aligned(256))); 127 }; 128 129 static inline u64 130 rdmab_addr(struct rpcrdma_regbuf *rb) 131 { 132 return rb->rg_iov.addr; 133 } 134 135 static inline u32 136 rdmab_length(struct rpcrdma_regbuf *rb) 137 { 138 return rb->rg_iov.length; 139 } 140 141 static inline u32 142 rdmab_lkey(struct rpcrdma_regbuf *rb) 143 { 144 return rb->rg_iov.lkey; 145 } 146 147 static inline struct ib_device * 148 rdmab_device(struct rpcrdma_regbuf *rb) 149 { 150 return rb->rg_device; 151 } 152 153 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 154 155 /* To ensure a transport can always make forward progress, 156 * the number of RDMA segments allowed in header chunk lists 157 * is capped at 8. This prevents less-capable devices and 158 * memory registrations from overrunning the Send buffer 159 * while building chunk lists. 160 * 161 * Elements of the Read list take up more room than the 162 * Write list or Reply chunk. 8 read segments means the Read 163 * list (or Write list or Reply chunk) cannot consume more 164 * than 165 * 166 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 167 * 168 * And the fixed part of the header is another 24 bytes. 169 * 170 * The smallest inline threshold is 1024 bytes, ensuring that 171 * at least 750 bytes are available for RPC messages. 172 */ 173 enum { 174 RPCRDMA_MAX_HDR_SEGS = 8, 175 RPCRDMA_HDRBUF_SIZE = 256, 176 }; 177 178 /* 179 * struct rpcrdma_rep -- this structure encapsulates state required 180 * to receive and complete an RPC Reply, asychronously. It needs 181 * several pieces of state: 182 * 183 * o receive buffer and ib_sge (donated to provider) 184 * o status of receive (success or not, length, inv rkey) 185 * o bookkeeping state to get run by reply handler (XDR stream) 186 * 187 * These structures are allocated during transport initialization. 188 * N of these are associated with a transport instance, managed by 189 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 190 */ 191 192 struct rpcrdma_rep { 193 struct ib_cqe rr_cqe; 194 __be32 rr_xid; 195 __be32 rr_vers; 196 __be32 rr_proc; 197 int rr_wc_flags; 198 u32 rr_inv_rkey; 199 struct rpcrdma_regbuf *rr_rdmabuf; 200 struct rpcrdma_xprt *rr_rxprt; 201 struct work_struct rr_work; 202 struct xdr_buf rr_hdrbuf; 203 struct xdr_stream rr_stream; 204 struct rpc_rqst *rr_rqst; 205 struct list_head rr_list; 206 struct ib_recv_wr rr_recv_wr; 207 }; 208 209 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes 210 */ 211 struct rpcrdma_req; 212 struct rpcrdma_xprt; 213 struct rpcrdma_sendctx { 214 struct ib_send_wr sc_wr; 215 struct ib_cqe sc_cqe; 216 struct rpcrdma_xprt *sc_xprt; 217 struct rpcrdma_req *sc_req; 218 unsigned int sc_unmap_count; 219 struct ib_sge sc_sges[]; 220 }; 221 222 /* Limit the number of SGEs that can be unmapped during one 223 * Send completion. This caps the amount of work a single 224 * completion can do before returning to the provider. 225 * 226 * Setting this to zero disables Send completion batching. 227 */ 228 enum { 229 RPCRDMA_MAX_SEND_BATCH = 7, 230 }; 231 232 /* 233 * struct rpcrdma_mr - external memory region metadata 234 * 235 * An external memory region is any buffer or page that is registered 236 * on the fly (ie, not pre-registered). 237 * 238 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mrs. During 239 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in 240 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep 241 * track of registration metadata while each RPC is pending. 242 * rpcrdma_deregister_external() uses this metadata to unmap and 243 * release these resources when an RPC is complete. 244 */ 245 enum rpcrdma_frwr_state { 246 FRWR_IS_INVALID, /* ready to be used */ 247 FRWR_IS_VALID, /* in use */ 248 FRWR_FLUSHED_FR, /* flushed FASTREG WR */ 249 FRWR_FLUSHED_LI, /* flushed LOCALINV WR */ 250 }; 251 252 struct rpcrdma_frwr { 253 struct ib_mr *fr_mr; 254 struct ib_cqe fr_cqe; 255 enum rpcrdma_frwr_state fr_state; 256 struct completion fr_linv_done; 257 union { 258 struct ib_reg_wr fr_regwr; 259 struct ib_send_wr fr_invwr; 260 }; 261 }; 262 263 struct rpcrdma_fmr { 264 struct ib_fmr *fm_mr; 265 u64 *fm_physaddrs; 266 }; 267 268 struct rpcrdma_mr { 269 struct list_head mr_list; 270 struct scatterlist *mr_sg; 271 int mr_nents; 272 enum dma_data_direction mr_dir; 273 union { 274 struct rpcrdma_fmr fmr; 275 struct rpcrdma_frwr frwr; 276 }; 277 struct rpcrdma_xprt *mr_xprt; 278 u32 mr_handle; 279 u32 mr_length; 280 u64 mr_offset; 281 struct list_head mr_all; 282 }; 283 284 /* 285 * struct rpcrdma_req -- structure central to the request/reply sequence. 286 * 287 * N of these are associated with a transport instance, and stored in 288 * struct rpcrdma_buffer. N is the max number of outstanding requests. 289 * 290 * It includes pre-registered buffer memory for send AND recv. 291 * The recv buffer, however, is not owned by this structure, and 292 * is "donated" to the hardware when a recv is posted. When a 293 * reply is handled, the recv buffer used is given back to the 294 * struct rpcrdma_req associated with the request. 295 * 296 * In addition to the basic memory, this structure includes an array 297 * of iovs for send operations. The reason is that the iovs passed to 298 * ib_post_{send,recv} must not be modified until the work request 299 * completes. 300 */ 301 302 /* Maximum number of page-sized "segments" per chunk list to be 303 * registered or invalidated. Must handle a Reply chunk: 304 */ 305 enum { 306 RPCRDMA_MAX_IOV_SEGS = 3, 307 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 308 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 309 RPCRDMA_MAX_IOV_SEGS, 310 }; 311 312 struct rpcrdma_mr_seg { /* chunk descriptors */ 313 u32 mr_len; /* length of chunk or segment */ 314 struct page *mr_page; /* owning page, if any */ 315 char *mr_offset; /* kva if no page, else offset */ 316 }; 317 318 /* The Send SGE array is provisioned to send a maximum size 319 * inline request: 320 * - RPC-over-RDMA header 321 * - xdr_buf head iovec 322 * - RPCRDMA_MAX_INLINE bytes, in pages 323 * - xdr_buf tail iovec 324 * 325 * The actual number of array elements consumed by each RPC 326 * depends on the device's max_sge limit. 327 */ 328 enum { 329 RPCRDMA_MIN_SEND_SGES = 3, 330 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 331 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 332 }; 333 334 struct rpcrdma_buffer; 335 struct rpcrdma_req { 336 struct list_head rl_list; 337 struct rpcrdma_buffer *rl_buffer; 338 struct rpcrdma_rep *rl_reply; 339 struct xdr_stream rl_stream; 340 struct xdr_buf rl_hdrbuf; 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 unsigned long rl_flags; 348 349 struct list_head rl_registered; /* registered segments */ 350 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 351 }; 352 353 /* rl_flags */ 354 enum { 355 RPCRDMA_REQ_F_PENDING = 0, 356 RPCRDMA_REQ_F_TX_RESOURCES, 357 }; 358 359 static inline void 360 rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req) 361 { 362 rqst->rq_xprtdata = req; 363 } 364 365 static inline struct rpcrdma_req * 366 rpcr_to_rdmar(const struct rpc_rqst *rqst) 367 { 368 return rqst->rq_xprtdata; 369 } 370 371 static inline void 372 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) 373 { 374 list_add_tail(&mr->mr_list, list); 375 } 376 377 static inline struct rpcrdma_mr * 378 rpcrdma_mr_pop(struct list_head *list) 379 { 380 struct rpcrdma_mr *mr; 381 382 mr = list_first_entry(list, struct rpcrdma_mr, mr_list); 383 list_del(&mr->mr_list); 384 return mr; 385 } 386 387 /* 388 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 389 * inline requests/replies, and client/server credits. 390 * 391 * One of these is associated with a transport instance 392 */ 393 struct rpcrdma_buffer { 394 spinlock_t rb_mrlock; /* protect rb_mrs list */ 395 struct list_head rb_mrs; 396 struct list_head rb_all; 397 398 unsigned long rb_sc_head; 399 unsigned long rb_sc_tail; 400 unsigned long rb_sc_last; 401 struct rpcrdma_sendctx **rb_sc_ctxs; 402 403 spinlock_t rb_lock; /* protect buf lists */ 404 int rb_send_count, rb_recv_count; 405 struct list_head rb_send_bufs; 406 struct list_head rb_recv_bufs; 407 u32 rb_max_requests; 408 u32 rb_credits; /* most recent credit grant */ 409 410 u32 rb_bc_srv_max_requests; 411 spinlock_t rb_reqslock; /* protect rb_allreqs */ 412 struct list_head rb_allreqs; 413 414 u32 rb_bc_max_requests; 415 416 spinlock_t rb_recovery_lock; /* protect rb_stale_mrs */ 417 struct list_head rb_stale_mrs; 418 struct delayed_work rb_recovery_worker; 419 struct delayed_work rb_refresh_worker; 420 }; 421 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) 422 423 /* 424 * Internal structure for transport instance creation. This 425 * exists primarily for modularity. 426 * 427 * This data should be set with mount options 428 */ 429 struct rpcrdma_create_data_internal { 430 unsigned int max_requests; /* max requests (slots) in flight */ 431 unsigned int rsize; /* mount rsize - max read hdr+data */ 432 unsigned int wsize; /* mount wsize - max write hdr+data */ 433 unsigned int inline_rsize; /* max non-rdma read data payload */ 434 unsigned int inline_wsize; /* max non-rdma write data payload */ 435 }; 436 437 /* 438 * Statistics for RPCRDMA 439 */ 440 struct rpcrdma_stats { 441 /* accessed when sending a call */ 442 unsigned long read_chunk_count; 443 unsigned long write_chunk_count; 444 unsigned long reply_chunk_count; 445 unsigned long long total_rdma_request; 446 447 /* rarely accessed error counters */ 448 unsigned long long pullup_copy_count; 449 unsigned long hardway_register_count; 450 unsigned long failed_marshal_count; 451 unsigned long bad_reply_count; 452 unsigned long mrs_recovered; 453 unsigned long mrs_orphaned; 454 unsigned long mrs_allocated; 455 unsigned long empty_sendctx_q; 456 457 /* accessed when receiving a reply */ 458 unsigned long long total_rdma_reply; 459 unsigned long long fixup_copy_count; 460 unsigned long reply_waits_for_send; 461 unsigned long local_inv_needed; 462 unsigned long nomsg_call_count; 463 unsigned long bcall_count; 464 }; 465 466 /* 467 * Per-registration mode operations 468 */ 469 struct rpcrdma_xprt; 470 struct rpcrdma_memreg_ops { 471 struct rpcrdma_mr_seg * 472 (*ro_map)(struct rpcrdma_xprt *, 473 struct rpcrdma_mr_seg *, int, bool, 474 struct rpcrdma_mr **); 475 int (*ro_send)(struct rpcrdma_ia *ia, 476 struct rpcrdma_req *req); 477 void (*ro_reminv)(struct rpcrdma_rep *rep, 478 struct list_head *mrs); 479 void (*ro_unmap_sync)(struct rpcrdma_xprt *, 480 struct list_head *); 481 void (*ro_recover_mr)(struct rpcrdma_mr *mr); 482 int (*ro_open)(struct rpcrdma_ia *, 483 struct rpcrdma_ep *, 484 struct rpcrdma_create_data_internal *); 485 size_t (*ro_maxpages)(struct rpcrdma_xprt *); 486 int (*ro_init_mr)(struct rpcrdma_ia *, 487 struct rpcrdma_mr *); 488 void (*ro_release_mr)(struct rpcrdma_mr *mr); 489 const char *ro_displayname; 490 const int ro_send_w_inv_ok; 491 }; 492 493 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; 494 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; 495 496 /* 497 * RPCRDMA transport -- encapsulates the structures above for 498 * integration with RPC. 499 * 500 * The contained structures are embedded, not pointers, 501 * for convenience. This structure need not be visible externally. 502 * 503 * It is allocated and initialized during mount, and released 504 * during unmount. 505 */ 506 struct rpcrdma_xprt { 507 struct rpc_xprt rx_xprt; 508 struct rpcrdma_ia rx_ia; 509 struct rpcrdma_ep rx_ep; 510 struct rpcrdma_buffer rx_buf; 511 struct rpcrdma_create_data_internal rx_data; 512 struct delayed_work rx_connect_worker; 513 struct rpcrdma_stats rx_stats; 514 }; 515 516 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 517 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 518 519 static inline const char * 520 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) 521 { 522 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; 523 } 524 525 static inline const char * 526 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) 527 { 528 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; 529 } 530 531 /* Setting this to 0 ensures interoperability with early servers. 532 * Setting this to 1 enhances certain unaligned read/write performance. 533 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 534 extern int xprt_rdma_pad_optimize; 535 536 /* This setting controls the hunt for a supported memory 537 * registration strategy. 538 */ 539 extern unsigned int xprt_rdma_memreg_strategy; 540 541 /* 542 * Interface Adapter calls - xprtrdma/verbs.c 543 */ 544 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt); 545 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 546 void rpcrdma_ia_close(struct rpcrdma_ia *); 547 bool frwr_is_supported(struct rpcrdma_ia *); 548 bool fmr_is_supported(struct rpcrdma_ia *); 549 550 extern struct workqueue_struct *rpcrdma_receive_wq; 551 552 /* 553 * Endpoint calls - xprtrdma/verbs.c 554 */ 555 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 556 struct rpcrdma_create_data_internal *); 557 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 558 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 559 void rpcrdma_conn_func(struct rpcrdma_ep *ep); 560 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 561 562 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 563 struct rpcrdma_req *); 564 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *); 565 566 /* 567 * Buffer calls - xprtrdma/verbs.c 568 */ 569 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 570 void rpcrdma_destroy_req(struct rpcrdma_req *); 571 int rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt); 572 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 573 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 574 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf); 575 void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc); 576 577 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); 578 void rpcrdma_mr_put(struct rpcrdma_mr *mr); 579 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr); 580 void rpcrdma_mr_defer_recovery(struct rpcrdma_mr *mr); 581 582 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 583 void rpcrdma_buffer_put(struct rpcrdma_req *); 584 void rpcrdma_recv_buffer_get(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_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int); 607 608 int rpcrdma_alloc_wq(void); 609 void rpcrdma_destroy_wq(void); 610 611 /* 612 * Wrappers for chunk registration, shared by read/write chunk code. 613 */ 614 615 static inline enum dma_data_direction 616 rpcrdma_data_dir(bool writing) 617 { 618 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 619 } 620 621 /* 622 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 623 */ 624 625 enum rpcrdma_chunktype { 626 rpcrdma_noch = 0, 627 rpcrdma_readch, 628 rpcrdma_areadch, 629 rpcrdma_writech, 630 rpcrdma_replych 631 }; 632 633 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 634 struct rpcrdma_req *req, u32 hdrlen, 635 struct xdr_buf *xdr, 636 enum rpcrdma_chunktype rtype); 637 void rpcrdma_unmap_sendctx(struct rpcrdma_sendctx *sc); 638 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 639 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 640 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 641 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 642 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, 643 struct rpcrdma_req *req); 644 void rpcrdma_deferred_completion(struct work_struct *work); 645 646 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 647 { 648 xdr->head[0].iov_len = len; 649 xdr->len = len; 650 } 651 652 /* RPC/RDMA module init - xprtrdma/transport.c 653 */ 654 extern unsigned int xprt_rdma_max_inline_read; 655 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 656 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 657 void rpcrdma_connect_worker(struct work_struct *work); 658 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 659 int xprt_rdma_init(void); 660 void xprt_rdma_cleanup(void); 661 662 /* Backchannel calls - xprtrdma/backchannel.c 663 */ 664 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 665 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 666 int xprt_rdma_bc_up(struct svc_serv *, struct net *); 667 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 668 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 669 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 670 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); 671 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 672 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 673 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 674 675 extern struct xprt_class xprt_rdma_bc; 676 677 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 678 679 #include <trace/events/rpcrdma.h> 680