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