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 int ri_async_rc; 73 unsigned int ri_max_segs; 74 unsigned int ri_max_frmr_depth; 75 unsigned int ri_max_inline_write; 76 unsigned int ri_max_inline_read; 77 unsigned int ri_max_send_sges; 78 bool ri_reminv_expected; 79 bool ri_implicit_roundup; 80 enum ib_mr_type ri_mrtype; 81 struct ib_qp_attr ri_qp_attr; 82 struct ib_qp_init_attr ri_qp_init_attr; 83 }; 84 85 /* 86 * RDMA Endpoint -- one per transport instance 87 */ 88 89 struct rpcrdma_ep { 90 atomic_t rep_cqcount; 91 int rep_cqinit; 92 int rep_connected; 93 struct ib_qp_init_attr rep_attr; 94 wait_queue_head_t rep_connect_wait; 95 struct rpcrdma_connect_private rep_cm_private; 96 struct rdma_conn_param rep_remote_cma; 97 struct sockaddr_storage rep_remote_addr; 98 struct delayed_work rep_connect_worker; 99 }; 100 101 static inline void 102 rpcrdma_init_cqcount(struct rpcrdma_ep *ep, int count) 103 { 104 atomic_set(&ep->rep_cqcount, ep->rep_cqinit - count); 105 } 106 107 /* To update send queue accounting, provider must take a 108 * send completion every now and then. 109 */ 110 static inline void 111 rpcrdma_set_signaled(struct rpcrdma_ep *ep, struct ib_send_wr *send_wr) 112 { 113 send_wr->send_flags = 0; 114 if (unlikely(atomic_sub_return(1, &ep->rep_cqcount) <= 0)) { 115 rpcrdma_init_cqcount(ep, 0); 116 send_wr->send_flags = IB_SEND_SIGNALED; 117 } 118 } 119 120 /* Pre-allocate extra Work Requests for handling backward receives 121 * and sends. This is a fixed value because the Work Queues are 122 * allocated when the forward channel is set up. 123 */ 124 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 125 #define RPCRDMA_BACKWARD_WRS (8) 126 #else 127 #define RPCRDMA_BACKWARD_WRS (0) 128 #endif 129 130 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV 131 * 132 * The below structure appears at the front of a large region of kmalloc'd 133 * memory, which always starts on a good alignment boundary. 134 */ 135 136 struct rpcrdma_regbuf { 137 struct ib_sge rg_iov; 138 struct ib_device *rg_device; 139 enum dma_data_direction rg_direction; 140 __be32 rg_base[0] __attribute__ ((aligned(256))); 141 }; 142 143 static inline u64 144 rdmab_addr(struct rpcrdma_regbuf *rb) 145 { 146 return rb->rg_iov.addr; 147 } 148 149 static inline u32 150 rdmab_length(struct rpcrdma_regbuf *rb) 151 { 152 return rb->rg_iov.length; 153 } 154 155 static inline u32 156 rdmab_lkey(struct rpcrdma_regbuf *rb) 157 { 158 return rb->rg_iov.lkey; 159 } 160 161 static inline struct rpcrdma_msg * 162 rdmab_to_msg(struct rpcrdma_regbuf *rb) 163 { 164 return (struct rpcrdma_msg *)rb->rg_base; 165 } 166 167 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) 168 169 /* To ensure a transport can always make forward progress, 170 * the number of RDMA segments allowed in header chunk lists 171 * is capped at 8. This prevents less-capable devices and 172 * memory registrations from overrunning the Send buffer 173 * while building chunk lists. 174 * 175 * Elements of the Read list take up more room than the 176 * Write list or Reply chunk. 8 read segments means the Read 177 * list (or Write list or Reply chunk) cannot consume more 178 * than 179 * 180 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. 181 * 182 * And the fixed part of the header is another 24 bytes. 183 * 184 * The smallest inline threshold is 1024 bytes, ensuring that 185 * at least 750 bytes are available for RPC messages. 186 */ 187 enum { 188 RPCRDMA_MAX_HDR_SEGS = 8, 189 RPCRDMA_HDRBUF_SIZE = 256, 190 }; 191 192 /* 193 * struct rpcrdma_rep -- this structure encapsulates state required to recv 194 * and complete a reply, asychronously. It needs several pieces of 195 * state: 196 * o recv buffer (posted to provider) 197 * o ib_sge (also donated to provider) 198 * o status of reply (length, success or not) 199 * o bookkeeping state to get run by reply handler (list, etc) 200 * 201 * These are allocated during initialization, per-transport instance. 202 * 203 * N of these are associated with a transport instance, and stored in 204 * struct rpcrdma_buffer. N is the max number of outstanding requests. 205 */ 206 207 struct rpcrdma_rep { 208 struct ib_cqe rr_cqe; 209 unsigned int rr_len; 210 int rr_wc_flags; 211 u32 rr_inv_rkey; 212 struct ib_device *rr_device; 213 struct rpcrdma_xprt *rr_rxprt; 214 struct work_struct rr_work; 215 struct list_head rr_list; 216 struct ib_recv_wr rr_recv_wr; 217 struct rpcrdma_regbuf *rr_rdmabuf; 218 }; 219 220 #define RPCRDMA_BAD_LEN (~0U) 221 222 /* 223 * struct rpcrdma_mw - external memory region metadata 224 * 225 * An external memory region is any buffer or page that is registered 226 * on the fly (ie, not pre-registered). 227 * 228 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During 229 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in 230 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep 231 * track of registration metadata while each RPC is pending. 232 * rpcrdma_deregister_external() uses this metadata to unmap and 233 * release these resources when an RPC is complete. 234 */ 235 enum rpcrdma_frmr_state { 236 FRMR_IS_INVALID, /* ready to be used */ 237 FRMR_IS_VALID, /* in use */ 238 FRMR_FLUSHED_FR, /* flushed FASTREG WR */ 239 FRMR_FLUSHED_LI, /* flushed LOCALINV WR */ 240 }; 241 242 struct rpcrdma_frmr { 243 struct ib_mr *fr_mr; 244 struct ib_cqe fr_cqe; 245 enum rpcrdma_frmr_state fr_state; 246 struct completion fr_linv_done; 247 union { 248 struct ib_reg_wr fr_regwr; 249 struct ib_send_wr fr_invwr; 250 }; 251 }; 252 253 struct rpcrdma_fmr { 254 struct ib_fmr *fm_mr; 255 u64 *fm_physaddrs; 256 }; 257 258 struct rpcrdma_mw { 259 struct list_head mw_list; 260 struct scatterlist *mw_sg; 261 int mw_nents; 262 enum dma_data_direction mw_dir; 263 union { 264 struct rpcrdma_fmr fmr; 265 struct rpcrdma_frmr frmr; 266 }; 267 struct rpcrdma_xprt *mw_xprt; 268 u32 mw_handle; 269 u32 mw_length; 270 u64 mw_offset; 271 struct list_head mw_all; 272 }; 273 274 /* 275 * struct rpcrdma_req -- structure central to the request/reply sequence. 276 * 277 * N of these are associated with a transport instance, and stored in 278 * struct rpcrdma_buffer. N is the max number of outstanding requests. 279 * 280 * It includes pre-registered buffer memory for send AND recv. 281 * The recv buffer, however, is not owned by this structure, and 282 * is "donated" to the hardware when a recv is posted. When a 283 * reply is handled, the recv buffer used is given back to the 284 * struct rpcrdma_req associated with the request. 285 * 286 * In addition to the basic memory, this structure includes an array 287 * of iovs for send operations. The reason is that the iovs passed to 288 * ib_post_{send,recv} must not be modified until the work request 289 * completes. 290 */ 291 292 /* Maximum number of page-sized "segments" per chunk list to be 293 * registered or invalidated. Must handle a Reply chunk: 294 */ 295 enum { 296 RPCRDMA_MAX_IOV_SEGS = 3, 297 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, 298 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + 299 RPCRDMA_MAX_IOV_SEGS, 300 }; 301 302 struct rpcrdma_mr_seg { /* chunk descriptors */ 303 u32 mr_len; /* length of chunk or segment */ 304 struct page *mr_page; /* owning page, if any */ 305 char *mr_offset; /* kva if no page, else offset */ 306 }; 307 308 /* The Send SGE array is provisioned to send a maximum size 309 * inline request: 310 * - RPC-over-RDMA header 311 * - xdr_buf head iovec 312 * - RPCRDMA_MAX_INLINE bytes, in pages 313 * - xdr_buf tail iovec 314 * 315 * The actual number of array elements consumed by each RPC 316 * depends on the device's max_sge limit. 317 */ 318 enum { 319 RPCRDMA_MIN_SEND_SGES = 3, 320 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, 321 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, 322 }; 323 324 struct rpcrdma_buffer; 325 struct rpcrdma_req { 326 struct list_head rl_free; 327 unsigned int rl_mapped_sges; 328 unsigned int rl_connect_cookie; 329 struct rpcrdma_buffer *rl_buffer; 330 struct rpcrdma_rep *rl_reply; 331 struct ib_send_wr rl_send_wr; 332 struct ib_sge rl_send_sge[RPCRDMA_MAX_SEND_SGES]; 333 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ 334 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ 335 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ 336 337 struct ib_cqe rl_cqe; 338 struct list_head rl_all; 339 bool rl_backchannel; 340 341 struct list_head rl_registered; /* registered segments */ 342 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; 343 }; 344 345 static inline void 346 rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req) 347 { 348 rqst->rq_xprtdata = req; 349 } 350 351 static inline struct rpcrdma_req * 352 rpcr_to_rdmar(struct rpc_rqst *rqst) 353 { 354 return rqst->rq_xprtdata; 355 } 356 357 static inline void 358 rpcrdma_push_mw(struct rpcrdma_mw *mw, struct list_head *list) 359 { 360 list_add_tail(&mw->mw_list, list); 361 } 362 363 static inline struct rpcrdma_mw * 364 rpcrdma_pop_mw(struct list_head *list) 365 { 366 struct rpcrdma_mw *mw; 367 368 mw = list_first_entry(list, struct rpcrdma_mw, mw_list); 369 list_del(&mw->mw_list); 370 return mw; 371 } 372 373 /* 374 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for 375 * inline requests/replies, and client/server credits. 376 * 377 * One of these is associated with a transport instance 378 */ 379 struct rpcrdma_buffer { 380 spinlock_t rb_mwlock; /* protect rb_mws list */ 381 struct list_head rb_mws; 382 struct list_head rb_all; 383 char *rb_pool; 384 385 spinlock_t rb_lock; /* protect buf lists */ 386 int rb_send_count, rb_recv_count; 387 struct list_head rb_send_bufs; 388 struct list_head rb_recv_bufs; 389 u32 rb_max_requests; 390 atomic_t rb_credits; /* most recent credit grant */ 391 392 u32 rb_bc_srv_max_requests; 393 spinlock_t rb_reqslock; /* protect rb_allreqs */ 394 struct list_head rb_allreqs; 395 396 u32 rb_bc_max_requests; 397 398 spinlock_t rb_recovery_lock; /* protect rb_stale_mrs */ 399 struct list_head rb_stale_mrs; 400 struct delayed_work rb_recovery_worker; 401 struct delayed_work rb_refresh_worker; 402 }; 403 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) 404 405 /* 406 * Internal structure for transport instance creation. This 407 * exists primarily for modularity. 408 * 409 * This data should be set with mount options 410 */ 411 struct rpcrdma_create_data_internal { 412 struct sockaddr_storage addr; /* RDMA server address */ 413 unsigned int max_requests; /* max requests (slots) in flight */ 414 unsigned int rsize; /* mount rsize - max read hdr+data */ 415 unsigned int wsize; /* mount wsize - max write hdr+data */ 416 unsigned int inline_rsize; /* max non-rdma read data payload */ 417 unsigned int inline_wsize; /* max non-rdma write data payload */ 418 unsigned int padding; /* non-rdma write header padding */ 419 }; 420 421 /* 422 * Statistics for RPCRDMA 423 */ 424 struct rpcrdma_stats { 425 unsigned long read_chunk_count; 426 unsigned long write_chunk_count; 427 unsigned long reply_chunk_count; 428 429 unsigned long long total_rdma_request; 430 unsigned long long total_rdma_reply; 431 432 unsigned long long pullup_copy_count; 433 unsigned long long fixup_copy_count; 434 unsigned long hardway_register_count; 435 unsigned long failed_marshal_count; 436 unsigned long bad_reply_count; 437 unsigned long nomsg_call_count; 438 unsigned long bcall_count; 439 unsigned long mrs_recovered; 440 unsigned long mrs_orphaned; 441 unsigned long mrs_allocated; 442 unsigned long local_inv_needed; 443 }; 444 445 /* 446 * Per-registration mode operations 447 */ 448 struct rpcrdma_xprt; 449 struct rpcrdma_memreg_ops { 450 int (*ro_map)(struct rpcrdma_xprt *, 451 struct rpcrdma_mr_seg *, int, bool, 452 struct rpcrdma_mw **); 453 void (*ro_unmap_sync)(struct rpcrdma_xprt *, 454 struct rpcrdma_req *); 455 void (*ro_unmap_safe)(struct rpcrdma_xprt *, 456 struct rpcrdma_req *, bool); 457 void (*ro_recover_mr)(struct rpcrdma_mw *); 458 int (*ro_open)(struct rpcrdma_ia *, 459 struct rpcrdma_ep *, 460 struct rpcrdma_create_data_internal *); 461 size_t (*ro_maxpages)(struct rpcrdma_xprt *); 462 int (*ro_init_mr)(struct rpcrdma_ia *, 463 struct rpcrdma_mw *); 464 void (*ro_release_mr)(struct rpcrdma_mw *); 465 const char *ro_displayname; 466 const int ro_send_w_inv_ok; 467 }; 468 469 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; 470 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; 471 472 /* 473 * RPCRDMA transport -- encapsulates the structures above for 474 * integration with RPC. 475 * 476 * The contained structures are embedded, not pointers, 477 * for convenience. This structure need not be visible externally. 478 * 479 * It is allocated and initialized during mount, and released 480 * during unmount. 481 */ 482 struct rpcrdma_xprt { 483 struct rpc_xprt rx_xprt; 484 struct rpcrdma_ia rx_ia; 485 struct rpcrdma_ep rx_ep; 486 struct rpcrdma_buffer rx_buf; 487 struct rpcrdma_create_data_internal rx_data; 488 struct delayed_work rx_connect_worker; 489 struct rpcrdma_stats rx_stats; 490 }; 491 492 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) 493 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) 494 495 /* Setting this to 0 ensures interoperability with early servers. 496 * Setting this to 1 enhances certain unaligned read/write performance. 497 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ 498 extern int xprt_rdma_pad_optimize; 499 500 /* 501 * Interface Adapter calls - xprtrdma/verbs.c 502 */ 503 int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int); 504 void rpcrdma_ia_close(struct rpcrdma_ia *); 505 bool frwr_is_supported(struct rpcrdma_ia *); 506 bool fmr_is_supported(struct rpcrdma_ia *); 507 508 /* 509 * Endpoint calls - xprtrdma/verbs.c 510 */ 511 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, 512 struct rpcrdma_create_data_internal *); 513 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); 514 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); 515 void rpcrdma_conn_func(struct rpcrdma_ep *ep); 516 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); 517 518 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, 519 struct rpcrdma_req *); 520 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *); 521 522 /* 523 * Buffer calls - xprtrdma/verbs.c 524 */ 525 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *); 526 struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *); 527 void rpcrdma_destroy_req(struct rpcrdma_req *); 528 int rpcrdma_buffer_create(struct rpcrdma_xprt *); 529 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); 530 531 struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *); 532 void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *); 533 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); 534 void rpcrdma_buffer_put(struct rpcrdma_req *); 535 void rpcrdma_recv_buffer_get(struct rpcrdma_req *); 536 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); 537 538 void rpcrdma_defer_mr_recovery(struct rpcrdma_mw *); 539 540 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction, 541 gfp_t); 542 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *); 543 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *); 544 545 static inline bool 546 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) 547 { 548 return rb->rg_device != NULL; 549 } 550 551 static inline bool 552 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) 553 { 554 if (likely(rpcrdma_regbuf_is_mapped(rb))) 555 return true; 556 return __rpcrdma_dma_map_regbuf(ia, rb); 557 } 558 559 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int); 560 561 int rpcrdma_alloc_wq(void); 562 void rpcrdma_destroy_wq(void); 563 564 /* 565 * Wrappers for chunk registration, shared by read/write chunk code. 566 */ 567 568 static inline enum dma_data_direction 569 rpcrdma_data_dir(bool writing) 570 { 571 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 572 } 573 574 /* 575 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c 576 */ 577 578 enum rpcrdma_chunktype { 579 rpcrdma_noch = 0, 580 rpcrdma_readch, 581 rpcrdma_areadch, 582 rpcrdma_writech, 583 rpcrdma_replych 584 }; 585 586 bool rpcrdma_prepare_send_sges(struct rpcrdma_ia *, struct rpcrdma_req *, 587 u32, struct xdr_buf *, enum rpcrdma_chunktype); 588 void rpcrdma_unmap_sges(struct rpcrdma_ia *, struct rpcrdma_req *); 589 int rpcrdma_marshal_req(struct rpc_rqst *); 590 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *); 591 void rpcrdma_reply_handler(struct work_struct *work); 592 593 /* RPC/RDMA module init - xprtrdma/transport.c 594 */ 595 extern unsigned int xprt_rdma_max_inline_read; 596 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); 597 void xprt_rdma_free_addresses(struct rpc_xprt *xprt); 598 void rpcrdma_connect_worker(struct work_struct *work); 599 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); 600 int xprt_rdma_init(void); 601 void xprt_rdma_cleanup(void); 602 603 /* Backchannel calls - xprtrdma/backchannel.c 604 */ 605 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 606 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); 607 int xprt_rdma_bc_up(struct svc_serv *, struct net *); 608 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); 609 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); 610 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); 611 int rpcrdma_bc_marshal_reply(struct rpc_rqst *); 612 void xprt_rdma_bc_free_rqst(struct rpc_rqst *); 613 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); 614 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 615 616 extern struct xprt_class xprt_rdma_bc; 617 618 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ 619