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_frmr_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_reminv_expected; 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 sockaddr_storage rep_remote_addr; 105 struct delayed_work rep_connect_worker; 106 }; 107 108 /* Pre-allocate extra Work Requests for handling backward receives 109 * and sends. This is a fixed value because the Work Queues are 110 * allocated when the forward channel is set up. 111 */ 112 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 113 #define RPCRDMA_BACKWARD_WRS (8) 114 #else 115 #define RPCRDMA_BACKWARD_WRS (0) 116 #endif 117 118 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 119 * 120 * The below structure appears at the front of a large region of kmalloc'd 121 * memory, which always starts on a good alignment boundary. 122 */ 123 124 struct rpcrdma_regbuf { 125 struct ib_sge rg_iov; 126 struct ib_device *rg_device; 127 enum dma_data_direction rg_direction; 128 __be32 rg_base[0] __attribute__ ((aligned(256))); 129 }; 130 131 static inline u64 132 rdmab_addr(struct rpcrdma_regbuf *rb) 133 { 134 return rb->rg_iov.addr; 135 } 136 137 static inline u32 138 rdmab_length(struct rpcrdma_regbuf *rb) 139 { 140 return rb->rg_iov.length; 141 } 142 143 static inline u32 144 rdmab_lkey(struct rpcrdma_regbuf *rb) 145 { 146 return rb->rg_iov.lkey; 147 } 148 149 static inline struct ib_device * 150 rdmab_device(struct rpcrdma_regbuf *rb) 151 { 152 return rb->rg_device; 153 } 154 155 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 156 157 /* To ensure a transport can always make forward progress, 158 * the number of RDMA segments allowed in header chunk lists 159 * is capped at 8. This prevents less-capable devices and 160 * memory registrations from overrunning the Send buffer 161 * while building chunk lists. 162 * 163 * Elements of the Read list take up more room than the 164 * Write list or Reply chunk. 8 read segments means the Read 165 * list (or Write list or Reply chunk) cannot consume more 166 * than 167 * 168 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 169 * 170 * And the fixed part of the header is another 24 bytes. 171 * 172 * The smallest inline threshold is 1024 bytes, ensuring that 173 * at least 750 bytes are available for RPC messages. 174 */ 175 enum { 176 RPCRDMA_MAX_HDR_SEGS = 8, 177 RPCRDMA_HDRBUF_SIZE = 256, 178 }; 179 180 /* 181 * struct rpcrdma_rep -- this structure encapsulates state required 182 * to receive and complete an RPC Reply, asychronously. It needs 183 * several pieces of state: 184 * 185 * o receive buffer and ib_sge (donated to provider) 186 * o status of receive (success or not, length, inv rkey) 187 * o bookkeeping state to get run by reply handler (XDR stream) 188 * 189 * These structures are allocated during transport initialization. 190 * N of these are associated with a transport instance, managed by 191 * struct rpcrdma_buffer. N is the max number of outstanding RPCs. 192 */ 193 194 struct rpcrdma_rep { 195 struct ib_cqe rr_cqe; 196 __be32 rr_xid; 197 __be32 rr_vers; 198 __be32 rr_proc; 199 int rr_wc_flags; 200 u32 rr_inv_rkey; 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_mw - 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_mws. 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_frmr_state { 248 FRMR_IS_INVALID, /* ready to be used */ 249 FRMR_IS_VALID, /* in use */ 250 FRMR_FLUSHED_FR, /* flushed FASTREG WR */ 251 FRMR_FLUSHED_LI, /* flushed LOCALINV WR */ 252 }; 253 254 struct rpcrdma_frmr { 255 struct ib_mr *fr_mr; 256 struct ib_cqe fr_cqe; 257 enum rpcrdma_frmr_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_mw { 271 struct list_head mw_list; 272 struct scatterlist *mw_sg; 273 int mw_nents; 274 enum dma_data_direction mw_dir; 275 unsigned long mw_flags; 276 union { 277 struct rpcrdma_fmr fmr; 278 struct rpcrdma_frmr frmr; 279 }; 280 struct rpcrdma_xprt *mw_xprt; 281 u32 mw_handle; 282 u32 mw_length; 283 u64 mw_offset; 284 struct list_head mw_all; 285 }; 286 287 /* mw_flags */ 288 enum { 289 RPCRDMA_MW_F_RI = 1, 290 }; 291 292 /* 293 * struct rpcrdma_req -- structure central to the request/reply sequence. 294 * 295 * N of these are associated with a transport instance, and stored in 296 * struct rpcrdma_buffer. N is the max number of outstanding requests. 297 * 298 * It includes pre-registered buffer memory for send AND recv. 299 * The recv buffer, however, is not owned by this structure, and 300 * is "donated" to the hardware when a recv is posted. When a 301 * reply is handled, the recv buffer used is given back to the 302 * struct rpcrdma_req associated with the request. 303 * 304 * In addition to the basic memory, this structure includes an array 305 * of iovs for send operations. The reason is that the iovs passed to 306 * ib_post_{send,recv} must not be modified until the work request 307 * completes. 308 */ 309 310 /* Maximum number of page-sized "segments" per chunk list to be 311 * registered or invalidated. Must handle a Reply chunk: 312 */ 313 enum { 314 RPCRDMA_MAX_IOV_SEGS = 3, 315 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 316 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 317 RPCRDMA_MAX_IOV_SEGS, 318 }; 319 320 struct rpcrdma_mr_seg { /* chunk descriptors */ 321 u32 mr_len; /* length of chunk or segment */ 322 struct page *mr_page; /* owning page, if any */ 323 char *mr_offset; /* kva if no page, else offset */ 324 }; 325 326 /* The Send SGE array is provisioned to send a maximum size 327 * inline request: 328 * - RPC-over-RDMA header 329 * - xdr_buf head iovec 330 * - RPCRDMA_MAX_INLINE bytes, in pages 331 * - xdr_buf tail iovec 332 * 333 * The actual number of array elements consumed by each RPC 334 * depends on the device's max_sge limit. 335 */ 336 enum { 337 RPCRDMA_MIN_SEND_SGES = 3, 338 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 339 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 340 }; 341 342 struct rpcrdma_buffer; 343 struct rpcrdma_req { 344 struct list_head rl_list; 345 unsigned int rl_connect_cookie; 346 struct rpcrdma_buffer *rl_buffer; 347 struct rpcrdma_rep *rl_reply; 348 struct xdr_stream rl_stream; 349 struct xdr_buf rl_hdrbuf; 350 struct rpcrdma_sendctx *rl_sendctx; 351 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 352 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 353 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 354 355 struct list_head rl_all; 356 unsigned long rl_flags; 357 358 struct list_head rl_registered; /* registered segments */ 359 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 360 }; 361 362 /* rl_flags */ 363 enum { 364 RPCRDMA_REQ_F_BACKCHANNEL = 0, 365 RPCRDMA_REQ_F_PENDING, 366 RPCRDMA_REQ_F_TX_RESOURCES, 367 }; 368 369 static inline void 370 rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req) 371 { 372 rqst->rq_xprtdata = req; 373 } 374 375 static inline struct rpcrdma_req * 376 rpcr_to_rdmar(struct rpc_rqst *rqst) 377 { 378 return rqst->rq_xprtdata; 379 } 380 381 static inline void 382 rpcrdma_push_mw(struct rpcrdma_mw *mw, struct list_head *list) 383 { 384 list_add_tail(&mw->mw_list, list); 385 } 386 387 static inline struct rpcrdma_mw * 388 rpcrdma_pop_mw(struct list_head *list) 389 { 390 struct rpcrdma_mw *mw; 391 392 mw = list_first_entry(list, struct rpcrdma_mw, mw_list); 393 list_del(&mw->mw_list); 394 return mw; 395 } 396 397 /* 398 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 399 * inline requests/replies, and client/server credits. 400 * 401 * One of these is associated with a transport instance 402 */ 403 struct rpcrdma_buffer { 404 spinlock_t rb_mwlock; /* protect rb_mws list */ 405 struct list_head rb_mws; 406 struct list_head rb_all; 407 408 unsigned long rb_sc_head; 409 unsigned long rb_sc_tail; 410 unsigned long rb_sc_last; 411 struct rpcrdma_sendctx **rb_sc_ctxs; 412 413 spinlock_t rb_lock; /* protect buf lists */ 414 int rb_send_count, rb_recv_count; 415 struct list_head rb_send_bufs; 416 struct list_head rb_recv_bufs; 417 u32 rb_max_requests; 418 u32 rb_credits; /* most recent credit grant */ 419 420 u32 rb_bc_srv_max_requests; 421 spinlock_t rb_reqslock; /* protect rb_allreqs */ 422 struct list_head rb_allreqs; 423 424 u32 rb_bc_max_requests; 425 426 spinlock_t rb_recovery_lock; /* protect rb_stale_mrs */ 427 struct list_head rb_stale_mrs; 428 struct delayed_work rb_recovery_worker; 429 struct delayed_work rb_refresh_worker; 430 }; 431 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) 432 433 /* 434 * Internal structure for transport instance creation. This 435 * exists primarily for modularity. 436 * 437 * This data should be set with mount options 438 */ 439 struct rpcrdma_create_data_internal { 440 struct sockaddr_storage addr; /* RDMA server address */ 441 unsigned int max_requests; /* max requests (slots) in flight */ 442 unsigned int rsize; /* mount rsize - max read hdr+data */ 443 unsigned int wsize; /* mount wsize - max write hdr+data */ 444 unsigned int inline_rsize; /* max non-rdma read data payload */ 445 unsigned int inline_wsize; /* max non-rdma write data payload */ 446 unsigned int padding; /* non-rdma write header padding */ 447 }; 448 449 /* 450 * Statistics for RPCRDMA 451 */ 452 struct rpcrdma_stats { 453 /* accessed when sending a call */ 454 unsigned long read_chunk_count; 455 unsigned long write_chunk_count; 456 unsigned long reply_chunk_count; 457 unsigned long long total_rdma_request; 458 459 /* rarely accessed error counters */ 460 unsigned long long pullup_copy_count; 461 unsigned long hardway_register_count; 462 unsigned long failed_marshal_count; 463 unsigned long bad_reply_count; 464 unsigned long mrs_recovered; 465 unsigned long mrs_orphaned; 466 unsigned long mrs_allocated; 467 unsigned long empty_sendctx_q; 468 469 /* accessed when receiving a reply */ 470 unsigned long long total_rdma_reply; 471 unsigned long long fixup_copy_count; 472 unsigned long reply_waits_for_send; 473 unsigned long local_inv_needed; 474 unsigned long nomsg_call_count; 475 unsigned long bcall_count; 476 }; 477 478 /* 479 * Per-registration mode operations 480 */ 481 struct rpcrdma_xprt; 482 struct rpcrdma_memreg_ops { 483 struct rpcrdma_mr_seg * 484 (*ro_map)(struct rpcrdma_xprt *, 485 struct rpcrdma_mr_seg *, int, bool, 486 struct rpcrdma_mw **); 487 void (*ro_unmap_sync)(struct rpcrdma_xprt *, 488 struct list_head *); 489 void (*ro_recover_mr)(struct rpcrdma_mw *); 490 int (*ro_open)(struct rpcrdma_ia *, 491 struct rpcrdma_ep *, 492 struct rpcrdma_create_data_internal *); 493 size_t (*ro_maxpages)(struct rpcrdma_xprt *); 494 int (*ro_init_mr)(struct rpcrdma_ia *, 495 struct rpcrdma_mw *); 496 void (*ro_release_mr)(struct rpcrdma_mw *); 497 const char *ro_displayname; 498 const int ro_send_w_inv_ok; 499 }; 500 501 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; 502 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; 503 504 /* 505 * RPCRDMA transport -- encapsulates the structures above for 506 * integration with RPC. 507 * 508 * The contained structures are embedded, not pointers, 509 * for convenience. This structure need not be visible externally. 510 * 511 * It is allocated and initialized during mount, and released 512 * during unmount. 513 */ 514 struct rpcrdma_xprt { 515 struct rpc_xprt rx_xprt; 516 struct rpcrdma_ia rx_ia; 517 struct rpcrdma_ep rx_ep; 518 struct rpcrdma_buffer rx_buf; 519 struct rpcrdma_create_data_internal rx_data; 520 struct delayed_work rx_connect_worker; 521 struct rpcrdma_stats rx_stats; 522 }; 523 524 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 525 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 526 527 /* Setting this to 0 ensures interoperability with early servers. 528 * Setting this to 1 enhances certain unaligned read/write performance. 529 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 530 extern int xprt_rdma_pad_optimize; 531 532 /* This setting controls the hunt for a supported memory 533 * registration strategy. 534 */ 535 extern unsigned int xprt_rdma_memreg_strategy; 536 537 /* 538 * Interface Adapter calls - xprtrdma/verbs.c 539 */ 540 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr); 541 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 542 void rpcrdma_ia_close(struct rpcrdma_ia *); 543 bool frwr_is_supported(struct rpcrdma_ia *); 544 bool fmr_is_supported(struct rpcrdma_ia *); 545 546 extern struct workqueue_struct *rpcrdma_receive_wq; 547 548 /* 549 * Endpoint calls - xprtrdma/verbs.c 550 */ 551 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 552 struct rpcrdma_create_data_internal *); 553 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 554 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 555 void rpcrdma_conn_func(struct rpcrdma_ep *ep); 556 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 557 558 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 559 struct rpcrdma_req *); 560 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *); 561 562 /* 563 * Buffer calls - xprtrdma/verbs.c 564 */ 565 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 566 struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *); 567 void rpcrdma_destroy_req(struct rpcrdma_req *); 568 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 569 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 570 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf); 571 void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc); 572 573 struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *); 574 void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *); 575 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 576 void rpcrdma_buffer_put(struct rpcrdma_req *); 577 void rpcrdma_recv_buffer_get(struct rpcrdma_req *); 578 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 579 580 void rpcrdma_defer_mr_recovery(struct rpcrdma_mw *); 581 582 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction, 583 gfp_t); 584 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); 585 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *); 586 587 static inline bool 588 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 589 { 590 return rb->rg_device != NULL; 591 } 592 593 static inline bool 594 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) 595 { 596 if (likely(rpcrdma_regbuf_is_mapped(rb))) 597 return true; 598 return __rpcrdma_dma_map_regbuf(ia, rb); 599 } 600 601 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int); 602 603 int rpcrdma_alloc_wq(void); 604 void rpcrdma_destroy_wq(void); 605 606 /* 607 * Wrappers for chunk registration, shared by read/write chunk code. 608 */ 609 610 static inline enum dma_data_direction 611 rpcrdma_data_dir(bool writing) 612 { 613 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 614 } 615 616 /* 617 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 618 */ 619 620 enum rpcrdma_chunktype { 621 rpcrdma_noch = 0, 622 rpcrdma_readch, 623 rpcrdma_areadch, 624 rpcrdma_writech, 625 rpcrdma_replych 626 }; 627 628 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, 629 struct rpcrdma_req *req, u32 hdrlen, 630 struct xdr_buf *xdr, 631 enum rpcrdma_chunktype rtype); 632 void rpcrdma_unmap_sendctx(struct rpcrdma_sendctx *sc); 633 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 634 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 635 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); 636 void rpcrdma_reply_handler(struct rpcrdma_rep *rep); 637 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt, 638 struct rpcrdma_req *req); 639 void rpcrdma_deferred_completion(struct work_struct *work); 640 641 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 642 { 643 xdr->head[0].iov_len = len; 644 xdr->len = len; 645 } 646 647 /* RPC/RDMA module init - xprtrdma/transport.c 648 */ 649 extern unsigned int xprt_rdma_max_inline_read; 650 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 651 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 652 void rpcrdma_connect_worker(struct work_struct *work); 653 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 654 int xprt_rdma_init(void); 655 void xprt_rdma_cleanup(void); 656 657 /* Backchannel calls - xprtrdma/backchannel.c 658 */ 659 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 660 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 661 int xprt_rdma_bc_up(struct svc_serv *, struct net *); 662 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 663 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 664 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 665 int rpcrdma_bc_marshal_reply(struct rpc_rqst *); 666 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 667 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 668 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 669 670 extern struct xprt_class xprt_rdma_bc; 671 672 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 673