1 /* 2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the BSD-type 8 * license below: 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 17 * Redistributions in binary form must reproduce the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer in the documentation and/or other materials provided 20 * with the distribution. 21 * 22 * Neither the name of the Network Appliance, Inc. nor the names of 23 * its contributors may be used to endorse or promote products 24 * derived from this software without specific prior written 25 * permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H 41 #define _LINUX_SUNRPC_XPRT_RDMA_H 42 43 #include <linux/wait.h> /* wait_queue_head_t, etc */ 44 #include <linux/spinlock.h> /* spinlock_t, etc */ 45 #include <linux/atomic.h> /* atomic_t, etc */ 46 #include <linux/workqueue.h> /* struct work_struct */ 47 48 #include <rdma/rdma_cm.h> /* RDMA connection api */ 49 #include <rdma/ib_verbs.h> /* RDMA verbs api */ 50 51 #include <linux/sunrpc/clnt.h> /* rpc_xprt */ 52 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ 53 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ 54 55 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ 56 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ 57 58 #define RPCRDMA_BIND_TO (60U * HZ) 59 #define RPCRDMA_INIT_REEST_TO (5U * HZ) 60 #define RPCRDMA_MAX_REEST_TO (30U * HZ) 61 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) 62 63 /* 64 * Interface Adapter -- one per transport instance 65 */ 66 struct rpcrdma_ia { 67 const struct rpcrdma_memreg_ops *ri_ops; 68 struct ib_device *ri_device; 69 struct rdma_cm_id *ri_id; 70 struct ib_pd *ri_pd; 71 struct completion ri_done; 72 struct completion ri_remove_done; 73 int ri_async_rc; 74 unsigned int ri_max_segs; 75 unsigned int ri_max_frmr_depth; 76 unsigned int ri_max_inline_write; 77 unsigned int ri_max_inline_read; 78 unsigned int ri_max_send_sges; 79 bool ri_reminv_expected; 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 atomic_t rep_cqcount; 97 int rep_cqinit; 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 sockaddr_storage rep_remote_addr; 104 struct delayed_work rep_connect_worker; 105 }; 106 107 static inline void 108 rpcrdma_init_cqcount(struct rpcrdma_ep *ep, int count) 109 { 110 atomic_set(&ep->rep_cqcount, ep->rep_cqinit - count); 111 } 112 113 /* To update send queue accounting, provider must take a 114 * send completion every now and then. 115 */ 116 static inline void 117 rpcrdma_set_signaled(struct rpcrdma_ep *ep, struct ib_send_wr *send_wr) 118 { 119 send_wr->send_flags = 0; 120 if (unlikely(atomic_sub_return(1, &ep->rep_cqcount) <= 0)) { 121 rpcrdma_init_cqcount(ep, 0); 122 send_wr->send_flags = IB_SEND_SIGNALED; 123 } 124 } 125 126 /* Pre-allocate extra Work Requests for handling backward receives 127 * and sends. This is a fixed value because the Work Queues are 128 * allocated when the forward channel is set up. 129 */ 130 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 131 #define RPCRDMA_BACKWARD_WRS (8) 132 #else 133 #define RPCRDMA_BACKWARD_WRS (0) 134 #endif 135 136 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 137 * 138 * The below structure appears at the front of a large region of kmalloc'd 139 * memory, which always starts on a good alignment boundary. 140 */ 141 142 struct rpcrdma_regbuf { 143 struct ib_sge rg_iov; 144 struct ib_device *rg_device; 145 enum dma_data_direction rg_direction; 146 __be32 rg_base[0] __attribute__ ((aligned(256))); 147 }; 148 149 static inline u64 150 rdmab_addr(struct rpcrdma_regbuf *rb) 151 { 152 return rb->rg_iov.addr; 153 } 154 155 static inline u32 156 rdmab_length(struct rpcrdma_regbuf *rb) 157 { 158 return rb->rg_iov.length; 159 } 160 161 static inline u32 162 rdmab_lkey(struct rpcrdma_regbuf *rb) 163 { 164 return rb->rg_iov.lkey; 165 } 166 167 static inline struct rpcrdma_msg * 168 rdmab_to_msg(struct rpcrdma_regbuf *rb) 169 { 170 return (struct rpcrdma_msg *)rb->rg_base; 171 } 172 173 static inline struct ib_device * 174 rdmab_device(struct rpcrdma_regbuf *rb) 175 { 176 return rb->rg_device; 177 } 178 179 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 180 181 /* To ensure a transport can always make forward progress, 182 * the number of RDMA segments allowed in header chunk lists 183 * is capped at 8. This prevents less-capable devices and 184 * memory registrations from overrunning the Send buffer 185 * while building chunk lists. 186 * 187 * Elements of the Read list take up more room than the 188 * Write list or Reply chunk. 8 read segments means the Read 189 * list (or Write list or Reply chunk) cannot consume more 190 * than 191 * 192 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 193 * 194 * And the fixed part of the header is another 24 bytes. 195 * 196 * The smallest inline threshold is 1024 bytes, ensuring that 197 * at least 750 bytes are available for RPC messages. 198 */ 199 enum { 200 RPCRDMA_MAX_HDR_SEGS = 8, 201 RPCRDMA_HDRBUF_SIZE = 256, 202 }; 203 204 /* 205 * struct rpcrdma_rep -- this structure encapsulates state required to recv 206 * and complete a reply, asychronously. It needs several pieces of 207 * state: 208 * o recv buffer (posted to provider) 209 * o ib_sge (also donated to provider) 210 * o status of reply (length, success or not) 211 * o bookkeeping state to get run by reply handler (list, etc) 212 * 213 * These are allocated during initialization, per-transport instance. 214 * 215 * N of these are associated with a transport instance, and stored in 216 * struct rpcrdma_buffer. N is the max number of outstanding requests. 217 */ 218 219 struct rpcrdma_rep { 220 struct ib_cqe rr_cqe; 221 int rr_wc_flags; 222 u32 rr_inv_rkey; 223 struct rpcrdma_regbuf *rr_rdmabuf; 224 struct rpcrdma_xprt *rr_rxprt; 225 struct work_struct rr_work; 226 struct xdr_buf rr_hdrbuf; 227 struct xdr_stream rr_stream; 228 struct list_head rr_list; 229 struct ib_recv_wr rr_recv_wr; 230 }; 231 232 /* 233 * struct rpcrdma_mw - 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_mws. 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_frmr_state { 246 FRMR_IS_INVALID, /* ready to be used */ 247 FRMR_IS_VALID, /* in use */ 248 FRMR_FLUSHED_FR, /* flushed FASTREG WR */ 249 FRMR_FLUSHED_LI, /* flushed LOCALINV WR */ 250 }; 251 252 struct rpcrdma_frmr { 253 struct ib_mr *fr_mr; 254 struct ib_cqe fr_cqe; 255 enum rpcrdma_frmr_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_mw { 269 struct list_head mw_list; 270 struct scatterlist *mw_sg; 271 int mw_nents; 272 enum dma_data_direction mw_dir; 273 unsigned long mw_flags; 274 union { 275 struct rpcrdma_fmr fmr; 276 struct rpcrdma_frmr frmr; 277 }; 278 struct rpcrdma_xprt *mw_xprt; 279 u32 mw_handle; 280 u32 mw_length; 281 u64 mw_offset; 282 struct list_head mw_all; 283 }; 284 285 /* mw_flags */ 286 enum { 287 RPCRDMA_MW_F_RI = 1, 288 }; 289 290 /* 291 * struct rpcrdma_req -- structure central to the request/reply sequence. 292 * 293 * N of these are associated with a transport instance, and stored in 294 * struct rpcrdma_buffer. N is the max number of outstanding requests. 295 * 296 * It includes pre-registered buffer memory for send AND recv. 297 * The recv buffer, however, is not owned by this structure, and 298 * is "donated" to the hardware when a recv is posted. When a 299 * reply is handled, the recv buffer used is given back to the 300 * struct rpcrdma_req associated with the request. 301 * 302 * In addition to the basic memory, this structure includes an array 303 * of iovs for send operations. The reason is that the iovs passed to 304 * ib_post_{send,recv} must not be modified until the work request 305 * completes. 306 */ 307 308 /* Maximum number of page-sized "segments" per chunk list to be 309 * registered or invalidated. Must handle a Reply chunk: 310 */ 311 enum { 312 RPCRDMA_MAX_IOV_SEGS = 3, 313 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 314 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 315 RPCRDMA_MAX_IOV_SEGS, 316 }; 317 318 struct rpcrdma_mr_seg { /* chunk descriptors */ 319 u32 mr_len; /* length of chunk or segment */ 320 struct page *mr_page; /* owning page, if any */ 321 char *mr_offset; /* kva if no page, else offset */ 322 }; 323 324 /* The Send SGE array is provisioned to send a maximum size 325 * inline request: 326 * - RPC-over-RDMA header 327 * - xdr_buf head iovec 328 * - RPCRDMA_MAX_INLINE bytes, in pages 329 * - xdr_buf tail iovec 330 * 331 * The actual number of array elements consumed by each RPC 332 * depends on the device's max_sge limit. 333 */ 334 enum { 335 RPCRDMA_MIN_SEND_SGES = 3, 336 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 337 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 338 }; 339 340 struct rpcrdma_buffer; 341 struct rpcrdma_req { 342 struct list_head rl_list; 343 unsigned int rl_mapped_sges; 344 unsigned int rl_connect_cookie; 345 struct rpcrdma_buffer *rl_buffer; 346 struct rpcrdma_rep *rl_reply; 347 struct xdr_stream rl_stream; 348 struct xdr_buf rl_hdrbuf; 349 struct ib_send_wr rl_send_wr; 350 struct ib_sge rl_send_sge[RPCRDMA_MAX_SEND_SGES]; 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 ib_cqe rl_cqe; 356 struct list_head rl_all; 357 bool rl_backchannel; 358 359 struct list_head rl_registered; /* registered segments */ 360 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 361 }; 362 363 static inline void 364 rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req) 365 { 366 rqst->rq_xprtdata = req; 367 } 368 369 static inline struct rpcrdma_req * 370 rpcr_to_rdmar(struct rpc_rqst *rqst) 371 { 372 return rqst->rq_xprtdata; 373 } 374 375 static inline void 376 rpcrdma_push_mw(struct rpcrdma_mw *mw, struct list_head *list) 377 { 378 list_add_tail(&mw->mw_list, list); 379 } 380 381 static inline struct rpcrdma_mw * 382 rpcrdma_pop_mw(struct list_head *list) 383 { 384 struct rpcrdma_mw *mw; 385 386 mw = list_first_entry(list, struct rpcrdma_mw, mw_list); 387 list_del(&mw->mw_list); 388 return mw; 389 } 390 391 /* 392 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 393 * inline requests/replies, and client/server credits. 394 * 395 * One of these is associated with a transport instance 396 */ 397 struct rpcrdma_buffer { 398 spinlock_t rb_mwlock; /* protect rb_mws list */ 399 struct list_head rb_mws; 400 struct list_head rb_all; 401 402 spinlock_t rb_lock; /* protect buf lists */ 403 int rb_send_count, rb_recv_count; 404 struct list_head rb_send_bufs; 405 struct list_head rb_recv_bufs; 406 u32 rb_max_requests; 407 atomic_t rb_credits; /* most recent credit grant */ 408 409 u32 rb_bc_srv_max_requests; 410 spinlock_t rb_reqslock; /* protect rb_allreqs */ 411 struct list_head rb_allreqs; 412 413 u32 rb_bc_max_requests; 414 415 spinlock_t rb_recovery_lock; /* protect rb_stale_mrs */ 416 struct list_head rb_stale_mrs; 417 struct delayed_work rb_recovery_worker; 418 struct delayed_work rb_refresh_worker; 419 }; 420 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) 421 422 /* 423 * Internal structure for transport instance creation. This 424 * exists primarily for modularity. 425 * 426 * This data should be set with mount options 427 */ 428 struct rpcrdma_create_data_internal { 429 struct sockaddr_storage addr; /* RDMA server address */ 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 unsigned int padding; /* non-rdma write header padding */ 436 }; 437 438 /* 439 * Statistics for RPCRDMA 440 */ 441 struct rpcrdma_stats { 442 /* accessed when sending a call */ 443 unsigned long read_chunk_count; 444 unsigned long write_chunk_count; 445 unsigned long reply_chunk_count; 446 unsigned long long total_rdma_request; 447 448 /* rarely accessed error counters */ 449 unsigned long long pullup_copy_count; 450 unsigned long hardway_register_count; 451 unsigned long failed_marshal_count; 452 unsigned long bad_reply_count; 453 unsigned long mrs_recovered; 454 unsigned long mrs_orphaned; 455 unsigned long mrs_allocated; 456 457 /* accessed when receiving a reply */ 458 unsigned long long total_rdma_reply; 459 unsigned long long fixup_copy_count; 460 unsigned long local_inv_needed; 461 unsigned long nomsg_call_count; 462 unsigned long bcall_count; 463 }; 464 465 /* 466 * Per-registration mode operations 467 */ 468 struct rpcrdma_xprt; 469 struct rpcrdma_memreg_ops { 470 struct rpcrdma_mr_seg * 471 (*ro_map)(struct rpcrdma_xprt *, 472 struct rpcrdma_mr_seg *, int, bool, 473 struct rpcrdma_mw **); 474 void (*ro_unmap_sync)(struct rpcrdma_xprt *, 475 struct list_head *); 476 void (*ro_unmap_safe)(struct rpcrdma_xprt *, 477 struct rpcrdma_req *, bool); 478 void (*ro_recover_mr)(struct rpcrdma_mw *); 479 int (*ro_open)(struct rpcrdma_ia *, 480 struct rpcrdma_ep *, 481 struct rpcrdma_create_data_internal *); 482 size_t (*ro_maxpages)(struct rpcrdma_xprt *); 483 int (*ro_init_mr)(struct rpcrdma_ia *, 484 struct rpcrdma_mw *); 485 void (*ro_release_mr)(struct rpcrdma_mw *); 486 const char *ro_displayname; 487 const int ro_send_w_inv_ok; 488 }; 489 490 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; 491 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; 492 493 /* 494 * RPCRDMA transport -- encapsulates the structures above for 495 * integration with RPC. 496 * 497 * The contained structures are embedded, not pointers, 498 * for convenience. This structure need not be visible externally. 499 * 500 * It is allocated and initialized during mount, and released 501 * during unmount. 502 */ 503 struct rpcrdma_xprt { 504 struct rpc_xprt rx_xprt; 505 struct rpcrdma_ia rx_ia; 506 struct rpcrdma_ep rx_ep; 507 struct rpcrdma_buffer rx_buf; 508 struct rpcrdma_create_data_internal rx_data; 509 struct delayed_work rx_connect_worker; 510 struct rpcrdma_stats rx_stats; 511 }; 512 513 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 514 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 515 516 /* Setting this to 0 ensures interoperability with early servers. 517 * Setting this to 1 enhances certain unaligned read/write performance. 518 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 519 extern int xprt_rdma_pad_optimize; 520 521 /* This setting controls the hunt for a supported memory 522 * registration strategy. 523 */ 524 extern unsigned int xprt_rdma_memreg_strategy; 525 526 /* 527 * Interface Adapter calls - xprtrdma/verbs.c 528 */ 529 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr); 530 void rpcrdma_ia_remove(struct rpcrdma_ia *ia); 531 void rpcrdma_ia_close(struct rpcrdma_ia *); 532 bool frwr_is_supported(struct rpcrdma_ia *); 533 bool fmr_is_supported(struct rpcrdma_ia *); 534 535 /* 536 * Endpoint calls - xprtrdma/verbs.c 537 */ 538 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 539 struct rpcrdma_create_data_internal *); 540 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 541 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 542 void rpcrdma_conn_func(struct rpcrdma_ep *ep); 543 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 544 545 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 546 struct rpcrdma_req *); 547 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *); 548 549 /* 550 * Buffer calls - xprtrdma/verbs.c 551 */ 552 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 553 struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *); 554 void rpcrdma_destroy_req(struct rpcrdma_req *); 555 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 556 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 557 558 struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *); 559 void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *); 560 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 561 void rpcrdma_buffer_put(struct rpcrdma_req *); 562 void rpcrdma_recv_buffer_get(struct rpcrdma_req *); 563 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 564 565 void rpcrdma_defer_mr_recovery(struct rpcrdma_mw *); 566 567 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction, 568 gfp_t); 569 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); 570 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *); 571 572 static inline bool 573 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 574 { 575 return rb->rg_device != NULL; 576 } 577 578 static inline bool 579 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) 580 { 581 if (likely(rpcrdma_regbuf_is_mapped(rb))) 582 return true; 583 return __rpcrdma_dma_map_regbuf(ia, rb); 584 } 585 586 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int); 587 588 int rpcrdma_alloc_wq(void); 589 void rpcrdma_destroy_wq(void); 590 591 /* 592 * Wrappers for chunk registration, shared by read/write chunk code. 593 */ 594 595 static inline enum dma_data_direction 596 rpcrdma_data_dir(bool writing) 597 { 598 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 599 } 600 601 /* 602 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 603 */ 604 605 enum rpcrdma_chunktype { 606 rpcrdma_noch = 0, 607 rpcrdma_readch, 608 rpcrdma_areadch, 609 rpcrdma_writech, 610 rpcrdma_replych 611 }; 612 613 bool rpcrdma_prepare_send_sges(struct rpcrdma_ia *, struct rpcrdma_req *, 614 u32, struct xdr_buf *, enum rpcrdma_chunktype); 615 void rpcrdma_unmap_sges(struct rpcrdma_ia *, struct rpcrdma_req *); 616 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); 617 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 618 void rpcrdma_reply_handler(struct work_struct *work); 619 620 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) 621 { 622 xdr->head[0].iov_len = len; 623 xdr->len = len; 624 } 625 626 /* RPC/RDMA module init - xprtrdma/transport.c 627 */ 628 extern unsigned int xprt_rdma_max_inline_read; 629 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 630 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 631 void rpcrdma_connect_worker(struct work_struct *work); 632 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 633 int xprt_rdma_init(void); 634 void xprt_rdma_cleanup(void); 635 636 /* Backchannel calls - xprtrdma/backchannel.c 637 */ 638 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 639 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 640 int xprt_rdma_bc_up(struct svc_serv *, struct net *); 641 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 642 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 643 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 644 int rpcrdma_bc_marshal_reply(struct rpc_rqst *); 645 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 646 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 647 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 648 649 extern struct xprt_class xprt_rdma_bc; 650 651 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 652