xprt_rdma.h 18 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
  2. /*
  3. * Copyright (c) 2014-2017 Oracle. All rights reserved.
  4. * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
  5. *
  6. * This software is available to you under a choice of one of two
  7. * licenses. You may choose to be licensed under the terms of the GNU
  8. * General Public License (GPL) Version 2, available from the file
  9. * COPYING in the main directory of this source tree, or the BSD-type
  10. * license below:
  11. *
  12. * Redistribution and use in source and binary forms, with or without
  13. * modification, are permitted provided that the following conditions
  14. * are met:
  15. *
  16. * Redistributions of source code must retain the above copyright
  17. * notice, this list of conditions and the following disclaimer.
  18. *
  19. * Redistributions in binary form must reproduce the above
  20. * copyright notice, this list of conditions and the following
  21. * disclaimer in the documentation and/or other materials provided
  22. * with the distribution.
  23. *
  24. * Neither the name of the Network Appliance, Inc. nor the names of
  25. * its contributors may be used to endorse or promote products
  26. * derived from this software without specific prior written
  27. * permission.
  28. *
  29. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  32. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  33. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  34. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40. */
  41. #ifndef _LINUX_SUNRPC_XPRT_RDMA_H
  42. #define _LINUX_SUNRPC_XPRT_RDMA_H
  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/kref.h> /* struct kref */
  47. #include <linux/workqueue.h> /* struct work_struct */
  48. #include <linux/llist.h>
  49. #include <rdma/rdma_cm.h> /* RDMA connection api */
  50. #include <rdma/ib_verbs.h> /* RDMA verbs api */
  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. #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */
  55. #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */
  56. #define RPCRDMA_BIND_TO (60U * HZ)
  57. #define RPCRDMA_INIT_REEST_TO (5U * HZ)
  58. #define RPCRDMA_MAX_REEST_TO (30U * HZ)
  59. #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
  60. /*
  61. * RDMA Endpoint -- connection endpoint details
  62. */
  63. struct rpcrdma_ep {
  64. struct kref re_kref;
  65. struct rdma_cm_id *re_id;
  66. struct ib_pd *re_pd;
  67. unsigned int re_max_rdma_segs;
  68. unsigned int re_max_fr_depth;
  69. bool re_implicit_roundup;
  70. enum ib_mr_type re_mrtype;
  71. struct completion re_done;
  72. unsigned int re_send_count;
  73. unsigned int re_send_batch;
  74. unsigned int re_max_inline_send;
  75. unsigned int re_max_inline_recv;
  76. int re_async_rc;
  77. int re_connect_status;
  78. atomic_t re_force_disconnect;
  79. struct ib_qp_init_attr re_attr;
  80. wait_queue_head_t re_connect_wait;
  81. struct rpc_xprt *re_xprt;
  82. struct rpcrdma_connect_private
  83. re_cm_private;
  84. struct rdma_conn_param re_remote_cma;
  85. int re_receive_count;
  86. unsigned int re_max_requests; /* depends on device */
  87. unsigned int re_inline_send; /* negotiated */
  88. unsigned int re_inline_recv; /* negotiated */
  89. };
  90. /* Pre-allocate extra Work Requests for handling backward receives
  91. * and sends. This is a fixed value because the Work Queues are
  92. * allocated when the forward channel is set up, long before the
  93. * backchannel is provisioned. This value is two times
  94. * NFS4_DEF_CB_SLOT_TABLE_SIZE.
  95. */
  96. #if defined(CONFIG_SUNRPC_BACKCHANNEL)
  97. #define RPCRDMA_BACKWARD_WRS (32)
  98. #else
  99. #define RPCRDMA_BACKWARD_WRS (0)
  100. #endif
  101. /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
  102. */
  103. struct rpcrdma_regbuf {
  104. struct ib_sge rg_iov;
  105. struct ib_device *rg_device;
  106. enum dma_data_direction rg_direction;
  107. void *rg_data;
  108. };
  109. static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb)
  110. {
  111. return rb->rg_iov.addr;
  112. }
  113. static inline u32 rdmab_length(struct rpcrdma_regbuf *rb)
  114. {
  115. return rb->rg_iov.length;
  116. }
  117. static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb)
  118. {
  119. return rb->rg_iov.lkey;
  120. }
  121. static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb)
  122. {
  123. return rb->rg_device;
  124. }
  125. static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
  126. {
  127. return rb->rg_data;
  128. }
  129. #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN)
  130. /* To ensure a transport can always make forward progress,
  131. * the number of RDMA segments allowed in header chunk lists
  132. * is capped at 16. This prevents less-capable devices from
  133. * overrunning the Send buffer while building chunk lists.
  134. *
  135. * Elements of the Read list take up more room than the
  136. * Write list or Reply chunk. 16 read segments means the
  137. * chunk lists cannot consume more than
  138. *
  139. * ((16 + 2) * read segment size) + 1 XDR words,
  140. *
  141. * or about 400 bytes. The fixed part of the header is
  142. * another 24 bytes. Thus when the inline threshold is
  143. * 1024 bytes, at least 600 bytes are available for RPC
  144. * message bodies.
  145. */
  146. enum {
  147. RPCRDMA_MAX_HDR_SEGS = 16,
  148. };
  149. /*
  150. * struct rpcrdma_rep -- this structure encapsulates state required
  151. * to receive and complete an RPC Reply, asychronously. It needs
  152. * several pieces of state:
  153. *
  154. * o receive buffer and ib_sge (donated to provider)
  155. * o status of receive (success or not, length, inv rkey)
  156. * o bookkeeping state to get run by reply handler (XDR stream)
  157. *
  158. * These structures are allocated during transport initialization.
  159. * N of these are associated with a transport instance, managed by
  160. * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
  161. */
  162. struct rpcrdma_rep {
  163. struct ib_cqe rr_cqe;
  164. __be32 rr_xid;
  165. __be32 rr_vers;
  166. __be32 rr_proc;
  167. int rr_wc_flags;
  168. u32 rr_inv_rkey;
  169. bool rr_temp;
  170. struct rpcrdma_regbuf *rr_rdmabuf;
  171. struct rpcrdma_xprt *rr_rxprt;
  172. struct rpc_rqst *rr_rqst;
  173. struct xdr_buf rr_hdrbuf;
  174. struct xdr_stream rr_stream;
  175. struct llist_node rr_node;
  176. struct ib_recv_wr rr_recv_wr;
  177. struct list_head rr_all;
  178. };
  179. /* To reduce the rate at which a transport invokes ib_post_recv
  180. * (and thus the hardware doorbell rate), xprtrdma posts Receive
  181. * WRs in batches.
  182. *
  183. * Setting this to zero disables Receive post batching.
  184. */
  185. enum {
  186. RPCRDMA_MAX_RECV_BATCH = 7,
  187. };
  188. /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
  189. */
  190. struct rpcrdma_req;
  191. struct rpcrdma_sendctx {
  192. struct ib_cqe sc_cqe;
  193. struct rpcrdma_req *sc_req;
  194. unsigned int sc_unmap_count;
  195. struct ib_sge sc_sges[];
  196. };
  197. /*
  198. * struct rpcrdma_mr - external memory region metadata
  199. *
  200. * An external memory region is any buffer or page that is registered
  201. * on the fly (ie, not pre-registered).
  202. */
  203. struct rpcrdma_frwr {
  204. struct ib_mr *fr_mr;
  205. struct ib_cqe fr_cqe;
  206. struct completion fr_linv_done;
  207. union {
  208. struct ib_reg_wr fr_regwr;
  209. struct ib_send_wr fr_invwr;
  210. };
  211. };
  212. struct rpcrdma_req;
  213. struct rpcrdma_mr {
  214. struct list_head mr_list;
  215. struct rpcrdma_req *mr_req;
  216. struct scatterlist *mr_sg;
  217. int mr_nents;
  218. enum dma_data_direction mr_dir;
  219. struct rpcrdma_frwr frwr;
  220. struct rpcrdma_xprt *mr_xprt;
  221. u32 mr_handle;
  222. u32 mr_length;
  223. u64 mr_offset;
  224. struct list_head mr_all;
  225. };
  226. /*
  227. * struct rpcrdma_req -- structure central to the request/reply sequence.
  228. *
  229. * N of these are associated with a transport instance, and stored in
  230. * struct rpcrdma_buffer. N is the max number of outstanding requests.
  231. *
  232. * It includes pre-registered buffer memory for send AND recv.
  233. * The recv buffer, however, is not owned by this structure, and
  234. * is "donated" to the hardware when a recv is posted. When a
  235. * reply is handled, the recv buffer used is given back to the
  236. * struct rpcrdma_req associated with the request.
  237. *
  238. * In addition to the basic memory, this structure includes an array
  239. * of iovs for send operations. The reason is that the iovs passed to
  240. * ib_post_{send,recv} must not be modified until the work request
  241. * completes.
  242. */
  243. /* Maximum number of page-sized "segments" per chunk list to be
  244. * registered or invalidated. Must handle a Reply chunk:
  245. */
  246. enum {
  247. RPCRDMA_MAX_IOV_SEGS = 3,
  248. RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
  249. RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS +
  250. RPCRDMA_MAX_IOV_SEGS,
  251. };
  252. struct rpcrdma_mr_seg { /* chunk descriptors */
  253. u32 mr_len; /* length of chunk or segment */
  254. struct page *mr_page; /* owning page, if any */
  255. char *mr_offset; /* kva if no page, else offset */
  256. };
  257. /* The Send SGE array is provisioned to send a maximum size
  258. * inline request:
  259. * - RPC-over-RDMA header
  260. * - xdr_buf head iovec
  261. * - RPCRDMA_MAX_INLINE bytes, in pages
  262. * - xdr_buf tail iovec
  263. *
  264. * The actual number of array elements consumed by each RPC
  265. * depends on the device's max_sge limit.
  266. */
  267. enum {
  268. RPCRDMA_MIN_SEND_SGES = 3,
  269. RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
  270. RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
  271. };
  272. struct rpcrdma_buffer;
  273. struct rpcrdma_req {
  274. struct list_head rl_list;
  275. struct rpc_rqst rl_slot;
  276. struct rpcrdma_rep *rl_reply;
  277. struct xdr_stream rl_stream;
  278. struct xdr_buf rl_hdrbuf;
  279. struct ib_send_wr rl_wr;
  280. struct rpcrdma_sendctx *rl_sendctx;
  281. struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */
  282. struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */
  283. struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */
  284. struct list_head rl_all;
  285. struct kref rl_kref;
  286. struct list_head rl_free_mrs;
  287. struct list_head rl_registered;
  288. struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];
  289. };
  290. static inline struct rpcrdma_req *
  291. rpcr_to_rdmar(const struct rpc_rqst *rqst)
  292. {
  293. return container_of(rqst, struct rpcrdma_req, rl_slot);
  294. }
  295. static inline void
  296. rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list)
  297. {
  298. list_add(&mr->mr_list, list);
  299. }
  300. static inline struct rpcrdma_mr *
  301. rpcrdma_mr_pop(struct list_head *list)
  302. {
  303. struct rpcrdma_mr *mr;
  304. mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list);
  305. if (mr)
  306. list_del_init(&mr->mr_list);
  307. return mr;
  308. }
  309. /*
  310. * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
  311. * inline requests/replies, and client/server credits.
  312. *
  313. * One of these is associated with a transport instance
  314. */
  315. struct rpcrdma_buffer {
  316. spinlock_t rb_lock;
  317. struct list_head rb_send_bufs;
  318. struct list_head rb_mrs;
  319. unsigned long rb_sc_head;
  320. unsigned long rb_sc_tail;
  321. unsigned long rb_sc_last;
  322. struct rpcrdma_sendctx **rb_sc_ctxs;
  323. struct list_head rb_allreqs;
  324. struct list_head rb_all_mrs;
  325. struct list_head rb_all_reps;
  326. struct llist_head rb_free_reps;
  327. __be32 rb_max_requests;
  328. u32 rb_credits; /* most recent credit grant */
  329. u32 rb_bc_srv_max_requests;
  330. u32 rb_bc_max_requests;
  331. struct work_struct rb_refresh_worker;
  332. };
  333. /*
  334. * Statistics for RPCRDMA
  335. */
  336. struct rpcrdma_stats {
  337. /* accessed when sending a call */
  338. unsigned long read_chunk_count;
  339. unsigned long write_chunk_count;
  340. unsigned long reply_chunk_count;
  341. unsigned long long total_rdma_request;
  342. /* rarely accessed error counters */
  343. unsigned long long pullup_copy_count;
  344. unsigned long hardway_register_count;
  345. unsigned long failed_marshal_count;
  346. unsigned long bad_reply_count;
  347. unsigned long mrs_recycled;
  348. unsigned long mrs_orphaned;
  349. unsigned long mrs_allocated;
  350. unsigned long empty_sendctx_q;
  351. /* accessed when receiving a reply */
  352. unsigned long long total_rdma_reply;
  353. unsigned long long fixup_copy_count;
  354. unsigned long reply_waits_for_send;
  355. unsigned long local_inv_needed;
  356. unsigned long nomsg_call_count;
  357. unsigned long bcall_count;
  358. };
  359. /*
  360. * RPCRDMA transport -- encapsulates the structures above for
  361. * integration with RPC.
  362. *
  363. * The contained structures are embedded, not pointers,
  364. * for convenience. This structure need not be visible externally.
  365. *
  366. * It is allocated and initialized during mount, and released
  367. * during unmount.
  368. */
  369. struct rpcrdma_xprt {
  370. struct rpc_xprt rx_xprt;
  371. struct rpcrdma_ep *rx_ep;
  372. struct rpcrdma_buffer rx_buf;
  373. struct delayed_work rx_connect_worker;
  374. struct rpc_timeout rx_timeout;
  375. struct rpcrdma_stats rx_stats;
  376. };
  377. #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
  378. static inline const char *
  379. rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt)
  380. {
  381. return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR];
  382. }
  383. static inline const char *
  384. rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt)
  385. {
  386. return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT];
  387. }
  388. /* Setting this to 0 ensures interoperability with early servers.
  389. * Setting this to 1 enhances certain unaligned read/write performance.
  390. * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
  391. extern int xprt_rdma_pad_optimize;
  392. /* This setting controls the hunt for a supported memory
  393. * registration strategy.
  394. */
  395. extern unsigned int xprt_rdma_memreg_strategy;
  396. /*
  397. * Endpoint calls - xprtrdma/verbs.c
  398. */
  399. void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc);
  400. int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt);
  401. void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt);
  402. int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
  403. void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp);
  404. /*
  405. * Buffer calls - xprtrdma/verbs.c
  406. */
  407. struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
  408. gfp_t flags);
  409. int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
  410. void rpcrdma_req_destroy(struct rpcrdma_req *req);
  411. int rpcrdma_buffer_create(struct rpcrdma_xprt *);
  412. void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
  413. struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
  414. struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
  415. void rpcrdma_mr_put(struct rpcrdma_mr *mr);
  416. void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt);
  417. struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
  418. void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers,
  419. struct rpcrdma_req *req);
  420. void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req);
  421. void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
  422. bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size,
  423. gfp_t flags);
  424. bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
  425. struct rpcrdma_regbuf *rb);
  426. /**
  427. * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped
  428. *
  429. * Returns true if the buffer is now mapped to rb->rg_device.
  430. */
  431. static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
  432. {
  433. return rb->rg_device != NULL;
  434. }
  435. /**
  436. * rpcrdma_regbuf_dma_map - DMA-map a regbuf
  437. * @r_xprt: controlling transport instance
  438. * @rb: regbuf to be mapped
  439. *
  440. * Returns true if the buffer is currently DMA mapped.
  441. */
  442. static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
  443. struct rpcrdma_regbuf *rb)
  444. {
  445. if (likely(rpcrdma_regbuf_is_mapped(rb)))
  446. return true;
  447. return __rpcrdma_regbuf_dma_map(r_xprt, rb);
  448. }
  449. /*
  450. * Wrappers for chunk registration, shared by read/write chunk code.
  451. */
  452. static inline enum dma_data_direction
  453. rpcrdma_data_dir(bool writing)
  454. {
  455. return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
  456. }
  457. /* Memory registration calls xprtrdma/frwr_ops.c
  458. */
  459. void frwr_reset(struct rpcrdma_req *req);
  460. int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device);
  461. int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr);
  462. void frwr_release_mr(struct rpcrdma_mr *mr);
  463. struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
  464. struct rpcrdma_mr_seg *seg,
  465. int nsegs, bool writing, __be32 xid,
  466. struct rpcrdma_mr *mr);
  467. int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
  468. void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
  469. void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
  470. void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
  471. /*
  472. * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
  473. */
  474. enum rpcrdma_chunktype {
  475. rpcrdma_noch = 0,
  476. rpcrdma_noch_pullup,
  477. rpcrdma_noch_mapped,
  478. rpcrdma_readch,
  479. rpcrdma_areadch,
  480. rpcrdma_writech,
  481. rpcrdma_replych
  482. };
  483. int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
  484. struct rpcrdma_req *req, u32 hdrlen,
  485. struct xdr_buf *xdr,
  486. enum rpcrdma_chunktype rtype);
  487. void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc);
  488. int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
  489. void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep);
  490. void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt);
  491. void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
  492. void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
  493. static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
  494. {
  495. xdr->head[0].iov_len = len;
  496. xdr->len = len;
  497. }
  498. /* RPC/RDMA module init - xprtrdma/transport.c
  499. */
  500. extern unsigned int xprt_rdma_max_inline_read;
  501. extern unsigned int xprt_rdma_max_inline_write;
  502. void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
  503. void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
  504. void xprt_rdma_close(struct rpc_xprt *xprt);
  505. void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
  506. int xprt_rdma_init(void);
  507. void xprt_rdma_cleanup(void);
  508. /* Backchannel calls - xprtrdma/backchannel.c
  509. */
  510. #if defined(CONFIG_SUNRPC_BACKCHANNEL)
  511. int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
  512. size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
  513. unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *);
  514. int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
  515. void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
  516. int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst);
  517. void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
  518. void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
  519. #endif /* CONFIG_SUNRPC_BACKCHANNEL */
  520. extern struct xprt_class xprt_rdma_bc;
  521. #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */