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f58851e6 | 1 | /* |
62b56a67 | 2 | * Copyright (c) 2014-2017 Oracle. All rights reserved. |
c56c65fb TT |
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. | |
f58851e6 TT |
39 | */ |
40 | ||
c56c65fb TT |
41 | /* |
42 | * verbs.c | |
43 | * | |
44 | * Encapsulates the major functions managing: | |
45 | * o adapters | |
46 | * o endpoints | |
47 | * o connections | |
48 | * o buffer memory | |
49 | */ | |
50 | ||
a6b7a407 | 51 | #include <linux/interrupt.h> |
5a0e3ad6 | 52 | #include <linux/slab.h> |
0dd39cae | 53 | #include <linux/sunrpc/addr.h> |
05c97466 | 54 | #include <linux/sunrpc/svc_rdma.h> |
ae72950a CL |
55 | |
56 | #include <asm-generic/barrier.h> | |
65866f82 | 57 | #include <asm/bitops.h> |
56a6bd15 | 58 | |
0a90487b | 59 | #include <rdma/ib_cm.h> |
c56c65fb | 60 | |
f58851e6 TT |
61 | #include "xprt_rdma.h" |
62 | ||
c56c65fb TT |
63 | /* |
64 | * Globals/Macros | |
65 | */ | |
66 | ||
f895b252 | 67 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
68 | # define RPCDBG_FACILITY RPCDBG_TRANS |
69 | #endif | |
70 | ||
71 | /* | |
72 | * internal functions | |
73 | */ | |
a9b0e381 | 74 | static void rpcrdma_create_mrs(struct rpcrdma_xprt *r_xprt); |
bebd0318 CL |
75 | static void rpcrdma_destroy_mrs(struct rpcrdma_buffer *buf); |
76 | static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb); | |
c56c65fb | 77 | |
d8f532d2 | 78 | struct workqueue_struct *rpcrdma_receive_wq __read_mostly; |
c56c65fb | 79 | |
fe97b47c CL |
80 | int |
81 | rpcrdma_alloc_wq(void) | |
c56c65fb | 82 | { |
fe97b47c | 83 | struct workqueue_struct *recv_wq; |
c56c65fb | 84 | |
fe97b47c | 85 | recv_wq = alloc_workqueue("xprtrdma_receive", |
ccede759 | 86 | WQ_MEM_RECLAIM | WQ_HIGHPRI, |
fe97b47c CL |
87 | 0); |
88 | if (!recv_wq) | |
89 | return -ENOMEM; | |
c56c65fb | 90 | |
fe97b47c CL |
91 | rpcrdma_receive_wq = recv_wq; |
92 | return 0; | |
c56c65fb TT |
93 | } |
94 | ||
fe97b47c CL |
95 | void |
96 | rpcrdma_destroy_wq(void) | |
f1a03b76 | 97 | { |
fe97b47c | 98 | struct workqueue_struct *wq; |
f1a03b76 | 99 | |
fe97b47c CL |
100 | if (rpcrdma_receive_wq) { |
101 | wq = rpcrdma_receive_wq; | |
102 | rpcrdma_receive_wq = NULL; | |
103 | destroy_workqueue(wq); | |
104 | } | |
f1a03b76 CL |
105 | } |
106 | ||
c56c65fb TT |
107 | static void |
108 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
109 | { | |
110 | struct rpcrdma_ep *ep = context; | |
111 | ||
2f6922ca CL |
112 | pr_err("rpcrdma: %s on device %s ep %p\n", |
113 | ib_event_msg(event->event), event->device->name, context); | |
114 | ||
c56c65fb TT |
115 | if (ep->rep_connected == 1) { |
116 | ep->rep_connected = -EIO; | |
afadc468 | 117 | rpcrdma_conn_func(ep); |
c56c65fb TT |
118 | wake_up_all(&ep->rep_connect_wait); |
119 | } | |
120 | } | |
121 | ||
2fa8f88d CL |
122 | /** |
123 | * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC | |
124 | * @cq: completion queue (ignored) | |
125 | * @wc: completed WR | |
126 | * | |
fc664485 CL |
127 | */ |
128 | static void | |
2fa8f88d | 129 | rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) |
fc664485 | 130 | { |
ae72950a CL |
131 | struct ib_cqe *cqe = wc->wr_cqe; |
132 | struct rpcrdma_sendctx *sc = | |
133 | container_of(cqe, struct rpcrdma_sendctx, sc_cqe); | |
134 | ||
2fa8f88d CL |
135 | /* WARNING: Only wr_cqe and status are reliable at this point */ |
136 | if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR) | |
137 | pr_err("rpcrdma: Send: %s (%u/0x%x)\n", | |
138 | ib_wc_status_msg(wc->status), | |
139 | wc->status, wc->vendor_err); | |
ae72950a CL |
140 | |
141 | rpcrdma_sendctx_put_locked(sc); | |
fc664485 | 142 | } |
c56c65fb | 143 | |
552bf225 | 144 | /** |
1519e969 | 145 | * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC |
552bf225 CL |
146 | * @cq: completion queue (ignored) |
147 | * @wc: completed WR | |
148 | * | |
149 | */ | |
fc664485 | 150 | static void |
1519e969 | 151 | rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) |
fc664485 | 152 | { |
552bf225 CL |
153 | struct ib_cqe *cqe = wc->wr_cqe; |
154 | struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep, | |
155 | rr_cqe); | |
fc664485 | 156 | |
8502427c CL |
157 | /* WARNING: Only wr_id and status are reliable at this point */ |
158 | if (wc->status != IB_WC_SUCCESS) | |
159 | goto out_fail; | |
fc664485 | 160 | |
8502427c | 161 | /* status == SUCCESS means all fields in wc are trustworthy */ |
8502427c CL |
162 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
163 | __func__, rep, wc->byte_len); | |
164 | ||
96f8778f | 165 | rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len); |
c8b920bb CL |
166 | rep->rr_wc_flags = wc->wc_flags; |
167 | rep->rr_inv_rkey = wc->ex.invalidate_rkey; | |
168 | ||
91a10c52 | 169 | ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf), |
6b1184cd | 170 | rdmab_addr(rep->rr_rdmabuf), |
e2a67190 | 171 | wc->byte_len, DMA_FROM_DEVICE); |
23826c7a | 172 | |
fc664485 | 173 | out_schedule: |
d8f532d2 | 174 | rpcrdma_reply_handler(rep); |
8502427c | 175 | return; |
fe97b47c | 176 | |
8502427c CL |
177 | out_fail: |
178 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
552bf225 CL |
179 | pr_err("rpcrdma: Recv: %s (%u/0x%x)\n", |
180 | ib_wc_status_msg(wc->status), | |
181 | wc->status, wc->vendor_err); | |
e2a67190 | 182 | rpcrdma_set_xdrlen(&rep->rr_hdrbuf, 0); |
8502427c | 183 | goto out_schedule; |
fc664485 CL |
184 | } |
185 | ||
87cfb9a0 CL |
186 | static void |
187 | rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt, | |
188 | struct rdma_conn_param *param) | |
189 | { | |
190 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
191 | const struct rpcrdma_connect_private *pmsg = param->private_data; | |
192 | unsigned int rsize, wsize; | |
193 | ||
c8b920bb CL |
194 | /* Default settings for RPC-over-RDMA Version One */ |
195 | r_xprt->rx_ia.ri_reminv_expected = false; | |
b5f0afbe | 196 | r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize; |
87cfb9a0 CL |
197 | rsize = RPCRDMA_V1_DEF_INLINE_SIZE; |
198 | wsize = RPCRDMA_V1_DEF_INLINE_SIZE; | |
199 | ||
200 | if (pmsg && | |
201 | pmsg->cp_magic == rpcrdma_cmp_magic && | |
202 | pmsg->cp_version == RPCRDMA_CMP_VERSION) { | |
c8b920bb | 203 | r_xprt->rx_ia.ri_reminv_expected = true; |
c95a3c6b | 204 | r_xprt->rx_ia.ri_implicit_roundup = true; |
87cfb9a0 CL |
205 | rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size); |
206 | wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size); | |
207 | } | |
208 | ||
209 | if (rsize < cdata->inline_rsize) | |
210 | cdata->inline_rsize = rsize; | |
211 | if (wsize < cdata->inline_wsize) | |
212 | cdata->inline_wsize = wsize; | |
6d6bf72d CL |
213 | dprintk("RPC: %s: max send %u, max recv %u\n", |
214 | __func__, cdata->inline_wsize, cdata->inline_rsize); | |
87cfb9a0 CL |
215 | rpcrdma_set_max_header_sizes(r_xprt); |
216 | } | |
217 | ||
c56c65fb TT |
218 | static int |
219 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
220 | { | |
221 | struct rpcrdma_xprt *xprt = id->context; | |
222 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
223 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
f895b252 | 224 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
0dd39cae | 225 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
ff0db049 | 226 | #endif |
c56c65fb TT |
227 | int connstate = 0; |
228 | ||
229 | switch (event->event) { | |
230 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
231 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 232 | ia->ri_async_rc = 0; |
c56c65fb TT |
233 | complete(&ia->ri_done); |
234 | break; | |
235 | case RDMA_CM_EVENT_ADDR_ERROR: | |
236 | ia->ri_async_rc = -EHOSTUNREACH; | |
237 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
238 | __func__, ep); | |
239 | complete(&ia->ri_done); | |
240 | break; | |
241 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
242 | ia->ri_async_rc = -ENETUNREACH; | |
243 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
244 | __func__, ep); | |
245 | complete(&ia->ri_done); | |
246 | break; | |
bebd0318 CL |
247 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
248 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) | |
173b8f49 CL |
249 | pr_info("rpcrdma: removing device %s for %pIS:%u\n", |
250 | ia->ri_device->name, | |
bebd0318 CL |
251 | sap, rpc_get_port(sap)); |
252 | #endif | |
253 | set_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags); | |
254 | ep->rep_connected = -ENODEV; | |
255 | xprt_force_disconnect(&xprt->rx_xprt); | |
256 | wait_for_completion(&ia->ri_remove_done); | |
257 | ||
258 | ia->ri_id = NULL; | |
259 | ia->ri_pd = NULL; | |
260 | ia->ri_device = NULL; | |
261 | /* Return 1 to ensure the core destroys the id. */ | |
262 | return 1; | |
c56c65fb TT |
263 | case RDMA_CM_EVENT_ESTABLISHED: |
264 | connstate = 1; | |
87cfb9a0 | 265 | rpcrdma_update_connect_private(xprt, &event->param.conn); |
c56c65fb TT |
266 | goto connected; |
267 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
268 | connstate = -ENOTCONN; | |
269 | goto connected; | |
270 | case RDMA_CM_EVENT_UNREACHABLE: | |
271 | connstate = -ENETDOWN; | |
272 | goto connected; | |
273 | case RDMA_CM_EVENT_REJECTED: | |
173b8f49 CL |
274 | dprintk("rpcrdma: connection to %pIS:%u rejected: %s\n", |
275 | sap, rpc_get_port(sap), | |
0a90487b | 276 | rdma_reject_msg(id, event->status)); |
c56c65fb | 277 | connstate = -ECONNREFUSED; |
0a90487b CL |
278 | if (event->status == IB_CM_REJ_STALE_CONN) |
279 | connstate = -EAGAIN; | |
c56c65fb TT |
280 | goto connected; |
281 | case RDMA_CM_EVENT_DISCONNECTED: | |
282 | connstate = -ECONNABORTED; | |
c56c65fb | 283 | connected: |
be798f90 | 284 | xprt->rx_buf.rb_credits = 1; |
c56c65fb | 285 | ep->rep_connected = connstate; |
afadc468 | 286 | rpcrdma_conn_func(ep); |
c56c65fb | 287 | wake_up_all(&ep->rep_connect_wait); |
8079fb78 | 288 | /*FALLTHROUGH*/ |
c56c65fb | 289 | default: |
173b8f49 CL |
290 | dprintk("RPC: %s: %pIS:%u on %s/%s (ep 0x%p): %s\n", |
291 | __func__, sap, rpc_get_port(sap), | |
292 | ia->ri_device->name, ia->ri_ops->ro_displayname, | |
293 | ep, rdma_event_msg(event->event)); | |
c56c65fb TT |
294 | break; |
295 | } | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static struct rdma_cm_id * | |
301 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
302 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
303 | { | |
109b88ab | 304 | unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1; |
c56c65fb TT |
305 | struct rdma_cm_id *id; |
306 | int rc; | |
307 | ||
1a954051 | 308 | init_completion(&ia->ri_done); |
bebd0318 | 309 | init_completion(&ia->ri_remove_done); |
1a954051 | 310 | |
fa20105e GS |
311 | id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, |
312 | IB_QPT_RC); | |
c56c65fb TT |
313 | if (IS_ERR(id)) { |
314 | rc = PTR_ERR(id); | |
315 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
316 | __func__, rc); | |
317 | return id; | |
318 | } | |
319 | ||
5675add3 | 320 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
321 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
322 | if (rc) { | |
323 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
324 | __func__, rc); | |
325 | goto out; | |
326 | } | |
109b88ab CL |
327 | rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout); |
328 | if (rc < 0) { | |
329 | dprintk("RPC: %s: wait() exited: %i\n", | |
330 | __func__, rc); | |
331 | goto out; | |
332 | } | |
d0f36c46 | 333 | |
c56c65fb TT |
334 | rc = ia->ri_async_rc; |
335 | if (rc) | |
336 | goto out; | |
337 | ||
5675add3 | 338 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
339 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
340 | if (rc) { | |
341 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
342 | __func__, rc); | |
56a6bd15 | 343 | goto out; |
c56c65fb | 344 | } |
109b88ab CL |
345 | rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout); |
346 | if (rc < 0) { | |
347 | dprintk("RPC: %s: wait() exited: %i\n", | |
348 | __func__, rc); | |
56a6bd15 | 349 | goto out; |
109b88ab | 350 | } |
c56c65fb TT |
351 | rc = ia->ri_async_rc; |
352 | if (rc) | |
56a6bd15 | 353 | goto out; |
c56c65fb TT |
354 | |
355 | return id; | |
56a6bd15 | 356 | |
c56c65fb TT |
357 | out: |
358 | rdma_destroy_id(id); | |
359 | return ERR_PTR(rc); | |
360 | } | |
361 | ||
c56c65fb TT |
362 | /* |
363 | * Exported functions. | |
364 | */ | |
365 | ||
fff09594 CL |
366 | /** |
367 | * rpcrdma_ia_open - Open and initialize an Interface Adapter. | |
368 | * @xprt: controlling transport | |
369 | * @addr: IP address of remote peer | |
370 | * | |
371 | * Returns 0 on success, negative errno if an appropriate | |
372 | * Interface Adapter could not be found and opened. | |
c56c65fb TT |
373 | */ |
374 | int | |
fff09594 | 375 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr) |
c56c65fb | 376 | { |
c56c65fb | 377 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
d1ed857e CL |
378 | int rc; |
379 | ||
c56c65fb TT |
380 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
381 | if (IS_ERR(ia->ri_id)) { | |
382 | rc = PTR_ERR(ia->ri_id); | |
fff09594 | 383 | goto out_err; |
c56c65fb | 384 | } |
89e0d112 | 385 | ia->ri_device = ia->ri_id->device; |
c56c65fb | 386 | |
ed082d36 | 387 | ia->ri_pd = ib_alloc_pd(ia->ri_device, 0); |
c56c65fb TT |
388 | if (IS_ERR(ia->ri_pd)) { |
389 | rc = PTR_ERR(ia->ri_pd); | |
b54054ca | 390 | pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc); |
fff09594 | 391 | goto out_err; |
c56c65fb TT |
392 | } |
393 | ||
fff09594 | 394 | switch (xprt_rdma_memreg_strategy) { |
3197d309 | 395 | case RPCRDMA_FRMR: |
b54054ca CL |
396 | if (frwr_is_supported(ia)) { |
397 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; | |
398 | break; | |
399 | } | |
400 | /*FALLTHROUGH*/ | |
bd7ed1d1 | 401 | case RPCRDMA_MTHCAFMR: |
b54054ca CL |
402 | if (fmr_is_supported(ia)) { |
403 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; | |
404 | break; | |
405 | } | |
406 | /*FALLTHROUGH*/ | |
bd7ed1d1 | 407 | default: |
fff09594 CL |
408 | pr_err("rpcrdma: Device %s does not support memreg mode %d\n", |
409 | ia->ri_device->name, xprt_rdma_memreg_strategy); | |
b54054ca | 410 | rc = -EINVAL; |
fff09594 | 411 | goto out_err; |
c56c65fb TT |
412 | } |
413 | ||
c56c65fb | 414 | return 0; |
5ae711a2 | 415 | |
fff09594 CL |
416 | out_err: |
417 | rpcrdma_ia_close(ia); | |
c56c65fb TT |
418 | return rc; |
419 | } | |
420 | ||
bebd0318 CL |
421 | /** |
422 | * rpcrdma_ia_remove - Handle device driver unload | |
423 | * @ia: interface adapter being removed | |
424 | * | |
425 | * Divest transport H/W resources associated with this adapter, | |
426 | * but allow it to be restored later. | |
427 | */ | |
428 | void | |
429 | rpcrdma_ia_remove(struct rpcrdma_ia *ia) | |
430 | { | |
431 | struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt, | |
432 | rx_ia); | |
433 | struct rpcrdma_ep *ep = &r_xprt->rx_ep; | |
434 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
435 | struct rpcrdma_req *req; | |
436 | struct rpcrdma_rep *rep; | |
437 | ||
438 | cancel_delayed_work_sync(&buf->rb_refresh_worker); | |
439 | ||
440 | /* This is similar to rpcrdma_ep_destroy, but: | |
441 | * - Don't cancel the connect worker. | |
442 | * - Don't call rpcrdma_ep_disconnect, which waits | |
443 | * for another conn upcall, which will deadlock. | |
444 | * - rdma_disconnect is unneeded, the underlying | |
445 | * connection is already gone. | |
446 | */ | |
447 | if (ia->ri_id->qp) { | |
448 | ib_drain_qp(ia->ri_id->qp); | |
449 | rdma_destroy_qp(ia->ri_id); | |
450 | ia->ri_id->qp = NULL; | |
451 | } | |
452 | ib_free_cq(ep->rep_attr.recv_cq); | |
453 | ib_free_cq(ep->rep_attr.send_cq); | |
454 | ||
455 | /* The ULP is responsible for ensuring all DMA | |
456 | * mappings and MRs are gone. | |
457 | */ | |
458 | list_for_each_entry(rep, &buf->rb_recv_bufs, rr_list) | |
459 | rpcrdma_dma_unmap_regbuf(rep->rr_rdmabuf); | |
460 | list_for_each_entry(req, &buf->rb_allreqs, rl_all) { | |
461 | rpcrdma_dma_unmap_regbuf(req->rl_rdmabuf); | |
462 | rpcrdma_dma_unmap_regbuf(req->rl_sendbuf); | |
463 | rpcrdma_dma_unmap_regbuf(req->rl_recvbuf); | |
464 | } | |
465 | rpcrdma_destroy_mrs(buf); | |
466 | ||
467 | /* Allow waiters to continue */ | |
468 | complete(&ia->ri_remove_done); | |
469 | } | |
470 | ||
fff09594 CL |
471 | /** |
472 | * rpcrdma_ia_close - Clean up/close an IA. | |
473 | * @ia: interface adapter to close | |
474 | * | |
c56c65fb TT |
475 | */ |
476 | void | |
477 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
478 | { | |
c56c65fb | 479 | dprintk("RPC: %s: entering\n", __func__); |
fee08caf TT |
480 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
481 | if (ia->ri_id->qp) | |
482 | rdma_destroy_qp(ia->ri_id); | |
56a6bd15 | 483 | rdma_destroy_id(ia->ri_id); |
fee08caf | 484 | } |
fff09594 CL |
485 | ia->ri_id = NULL; |
486 | ia->ri_device = NULL; | |
6d44698d CL |
487 | |
488 | /* If the pd is still busy, xprtrdma missed freeing a resource */ | |
489 | if (ia->ri_pd && !IS_ERR(ia->ri_pd)) | |
7dd78647 | 490 | ib_dealloc_pd(ia->ri_pd); |
fff09594 | 491 | ia->ri_pd = NULL; |
c56c65fb TT |
492 | } |
493 | ||
494 | /* | |
495 | * Create unconnected endpoint. | |
496 | */ | |
497 | int | |
498 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
16f906d6 | 499 | struct rpcrdma_create_data_internal *cdata) |
c56c65fb | 500 | { |
87cfb9a0 | 501 | struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private; |
16f906d6 | 502 | unsigned int max_qp_wr, max_sge; |
fc664485 | 503 | struct ib_cq *sendcq, *recvcq; |
2fa8f88d | 504 | int rc; |
c56c65fb | 505 | |
eed50879 CL |
506 | max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge, |
507 | RPCRDMA_MAX_SEND_SGES); | |
16f906d6 CL |
508 | if (max_sge < RPCRDMA_MIN_SEND_SGES) { |
509 | pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge); | |
b3221d6a CL |
510 | return -ENOMEM; |
511 | } | |
16f906d6 | 512 | ia->ri_max_send_sges = max_sge - RPCRDMA_MIN_SEND_SGES; |
b3221d6a | 513 | |
e3e45b1b | 514 | if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) { |
124fa17d CL |
515 | dprintk("RPC: %s: insufficient wqe's available\n", |
516 | __func__); | |
517 | return -ENOMEM; | |
518 | } | |
550d7502 | 519 | max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1; |
124fa17d | 520 | |
c56c65fb | 521 | /* check provider's send/recv wr limits */ |
124fa17d CL |
522 | if (cdata->max_requests > max_qp_wr) |
523 | cdata->max_requests = max_qp_wr; | |
c56c65fb TT |
524 | |
525 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
526 | ep->rep_attr.qp_context = ep; | |
c56c65fb TT |
527 | ep->rep_attr.srq = NULL; |
528 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
124fa17d | 529 | ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS; |
550d7502 | 530 | ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */ |
3968cb58 CL |
531 | rc = ia->ri_ops->ro_open(ia, ep, cdata); |
532 | if (rc) | |
533 | return rc; | |
c56c65fb | 534 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; |
124fa17d | 535 | ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS; |
550d7502 | 536 | ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */ |
16f906d6 | 537 | ep->rep_attr.cap.max_send_sge = max_sge; |
c56c65fb TT |
538 | ep->rep_attr.cap.max_recv_sge = 1; |
539 | ep->rep_attr.cap.max_inline_data = 0; | |
540 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
541 | ep->rep_attr.qp_type = IB_QPT_RC; | |
542 | ep->rep_attr.port_num = ~0; | |
543 | ||
544 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " | |
545 | "iovs: send %d recv %d\n", | |
546 | __func__, | |
547 | ep->rep_attr.cap.max_send_wr, | |
548 | ep->rep_attr.cap.max_recv_wr, | |
549 | ep->rep_attr.cap.max_send_sge, | |
550 | ep->rep_attr.cap.max_recv_sge); | |
551 | ||
552 | /* set trigger for requesting send completion */ | |
ae72950a CL |
553 | ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH, |
554 | cdata->max_requests >> 2); | |
555 | ep->rep_send_count = ep->rep_send_batch; | |
c56c65fb | 556 | init_waitqueue_head(&ep->rep_connect_wait); |
254f91e2 | 557 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
c56c65fb | 558 | |
2fa8f88d CL |
559 | sendcq = ib_alloc_cq(ia->ri_device, NULL, |
560 | ep->rep_attr.cap.max_send_wr + 1, | |
a4699f56 | 561 | 1, IB_POLL_WORKQUEUE); |
fc664485 CL |
562 | if (IS_ERR(sendcq)) { |
563 | rc = PTR_ERR(sendcq); | |
564 | dprintk("RPC: %s: failed to create send CQ: %i\n", | |
c56c65fb TT |
565 | __func__, rc); |
566 | goto out1; | |
567 | } | |
568 | ||
552bf225 CL |
569 | recvcq = ib_alloc_cq(ia->ri_device, NULL, |
570 | ep->rep_attr.cap.max_recv_wr + 1, | |
d8f532d2 | 571 | 0, IB_POLL_WORKQUEUE); |
fc664485 CL |
572 | if (IS_ERR(recvcq)) { |
573 | rc = PTR_ERR(recvcq); | |
574 | dprintk("RPC: %s: failed to create recv CQ: %i\n", | |
575 | __func__, rc); | |
576 | goto out2; | |
577 | } | |
578 | ||
fc664485 CL |
579 | ep->rep_attr.send_cq = sendcq; |
580 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
581 | |
582 | /* Initialize cma parameters */ | |
b2dde94b | 583 | memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma)); |
c56c65fb | 584 | |
87cfb9a0 CL |
585 | /* Prepare RDMA-CM private message */ |
586 | pmsg->cp_magic = rpcrdma_cmp_magic; | |
587 | pmsg->cp_version = RPCRDMA_CMP_VERSION; | |
c8b920bb | 588 | pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok; |
87cfb9a0 CL |
589 | pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize); |
590 | pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize); | |
591 | ep->rep_remote_cma.private_data = pmsg; | |
592 | ep->rep_remote_cma.private_data_len = sizeof(*pmsg); | |
c56c65fb TT |
593 | |
594 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 595 | ep->rep_remote_cma.initiator_depth = 0; |
e3e45b1b | 596 | if (ia->ri_device->attrs.max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
b334eaab TT |
597 | ep->rep_remote_cma.responder_resources = 32; |
598 | else | |
7bc7972c | 599 | ep->rep_remote_cma.responder_resources = |
e3e45b1b | 600 | ia->ri_device->attrs.max_qp_rd_atom; |
c56c65fb | 601 | |
b2dde94b CL |
602 | /* Limit transport retries so client can detect server |
603 | * GID changes quickly. RPC layer handles re-establishing | |
604 | * transport connection and retransmission. | |
605 | */ | |
606 | ep->rep_remote_cma.retry_count = 6; | |
607 | ||
608 | /* RPC-over-RDMA handles its own flow control. In addition, | |
609 | * make all RNR NAKs visible so we know that RPC-over-RDMA | |
610 | * flow control is working correctly (no NAKs should be seen). | |
611 | */ | |
c56c65fb TT |
612 | ep->rep_remote_cma.flow_control = 0; |
613 | ep->rep_remote_cma.rnr_retry_count = 0; | |
614 | ||
615 | return 0; | |
616 | ||
617 | out2: | |
2fa8f88d | 618 | ib_free_cq(sendcq); |
c56c65fb TT |
619 | out1: |
620 | return rc; | |
621 | } | |
622 | ||
623 | /* | |
624 | * rpcrdma_ep_destroy | |
625 | * | |
626 | * Disconnect and destroy endpoint. After this, the only | |
627 | * valid operations on the ep are to free it (if dynamically | |
628 | * allocated) or re-create it. | |
c56c65fb | 629 | */ |
7f1d5419 | 630 | void |
c56c65fb TT |
631 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
632 | { | |
c56c65fb TT |
633 | dprintk("RPC: %s: entering, connected is %d\n", |
634 | __func__, ep->rep_connected); | |
635 | ||
254f91e2 CL |
636 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
637 | ||
72c02173 | 638 | if (ia->ri_id->qp) { |
550d7502 | 639 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
640 | rdma_destroy_qp(ia->ri_id); |
641 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
642 | } |
643 | ||
552bf225 | 644 | ib_free_cq(ep->rep_attr.recv_cq); |
2fa8f88d | 645 | ib_free_cq(ep->rep_attr.send_cq); |
c56c65fb TT |
646 | } |
647 | ||
a9b0e381 CL |
648 | /* Re-establish a connection after a device removal event. |
649 | * Unlike a normal reconnection, a fresh PD and a new set | |
650 | * of MRs and buffers is needed. | |
651 | */ | |
652 | static int | |
653 | rpcrdma_ep_recreate_xprt(struct rpcrdma_xprt *r_xprt, | |
654 | struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
655 | { | |
656 | struct sockaddr *sap = (struct sockaddr *)&r_xprt->rx_data.addr; | |
657 | int rc, err; | |
658 | ||
659 | pr_info("%s: r_xprt = %p\n", __func__, r_xprt); | |
660 | ||
661 | rc = -EHOSTUNREACH; | |
662 | if (rpcrdma_ia_open(r_xprt, sap)) | |
663 | goto out1; | |
664 | ||
665 | rc = -ENOMEM; | |
666 | err = rpcrdma_ep_create(ep, ia, &r_xprt->rx_data); | |
667 | if (err) { | |
668 | pr_err("rpcrdma: rpcrdma_ep_create returned %d\n", err); | |
669 | goto out2; | |
670 | } | |
671 | ||
672 | rc = -ENETUNREACH; | |
673 | err = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
674 | if (err) { | |
675 | pr_err("rpcrdma: rdma_create_qp returned %d\n", err); | |
676 | goto out3; | |
677 | } | |
678 | ||
679 | rpcrdma_create_mrs(r_xprt); | |
680 | return 0; | |
681 | ||
682 | out3: | |
683 | rpcrdma_ep_destroy(ep, ia); | |
684 | out2: | |
685 | rpcrdma_ia_close(ia); | |
686 | out1: | |
687 | return rc; | |
688 | } | |
689 | ||
1890896b CL |
690 | static int |
691 | rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep, | |
692 | struct rpcrdma_ia *ia) | |
693 | { | |
694 | struct sockaddr *sap = (struct sockaddr *)&r_xprt->rx_data.addr; | |
695 | struct rdma_cm_id *id, *old; | |
696 | int err, rc; | |
697 | ||
698 | dprintk("RPC: %s: reconnecting...\n", __func__); | |
699 | ||
700 | rpcrdma_ep_disconnect(ep, ia); | |
701 | ||
702 | rc = -EHOSTUNREACH; | |
703 | id = rpcrdma_create_id(r_xprt, ia, sap); | |
704 | if (IS_ERR(id)) | |
705 | goto out; | |
706 | ||
707 | /* As long as the new ID points to the same device as the | |
708 | * old ID, we can reuse the transport's existing PD and all | |
709 | * previously allocated MRs. Also, the same device means | |
710 | * the transport's previous DMA mappings are still valid. | |
711 | * | |
712 | * This is a sanity check only. There should be no way these | |
713 | * point to two different devices here. | |
714 | */ | |
715 | old = id; | |
716 | rc = -ENETUNREACH; | |
717 | if (ia->ri_device != id->device) { | |
718 | pr_err("rpcrdma: can't reconnect on different device!\n"); | |
719 | goto out_destroy; | |
720 | } | |
721 | ||
722 | err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); | |
723 | if (err) { | |
724 | dprintk("RPC: %s: rdma_create_qp returned %d\n", | |
725 | __func__, err); | |
726 | goto out_destroy; | |
727 | } | |
728 | ||
729 | /* Atomically replace the transport's ID and QP. */ | |
730 | rc = 0; | |
731 | old = ia->ri_id; | |
732 | ia->ri_id = id; | |
733 | rdma_destroy_qp(old); | |
734 | ||
735 | out_destroy: | |
56a6bd15 | 736 | rdma_destroy_id(old); |
1890896b CL |
737 | out: |
738 | return rc; | |
739 | } | |
740 | ||
c56c65fb TT |
741 | /* |
742 | * Connect unconnected endpoint. | |
743 | */ | |
744 | int | |
745 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
746 | { | |
0a90487b CL |
747 | struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt, |
748 | rx_ia); | |
0a90487b | 749 | unsigned int extras; |
1890896b | 750 | int rc; |
c56c65fb | 751 | |
c56c65fb | 752 | retry: |
1890896b CL |
753 | switch (ep->rep_connected) { |
754 | case 0: | |
ec62f40d CL |
755 | dprintk("RPC: %s: connecting...\n", __func__); |
756 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
757 | if (rc) { | |
758 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
759 | __func__, rc); | |
1890896b CL |
760 | rc = -ENETUNREACH; |
761 | goto out_noupdate; | |
ec62f40d | 762 | } |
1890896b | 763 | break; |
a9b0e381 CL |
764 | case -ENODEV: |
765 | rc = rpcrdma_ep_recreate_xprt(r_xprt, ep, ia); | |
766 | if (rc) | |
767 | goto out_noupdate; | |
768 | break; | |
1890896b CL |
769 | default: |
770 | rc = rpcrdma_ep_reconnect(r_xprt, ep, ia); | |
771 | if (rc) | |
772 | goto out; | |
c56c65fb TT |
773 | } |
774 | ||
c56c65fb TT |
775 | ep->rep_connected = 0; |
776 | ||
777 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
778 | if (rc) { | |
779 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
780 | __func__, rc); | |
781 | goto out; | |
782 | } | |
783 | ||
c56c65fb | 784 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
c56c65fb | 785 | if (ep->rep_connected <= 0) { |
0a90487b | 786 | if (ep->rep_connected == -EAGAIN) |
c56c65fb TT |
787 | goto retry; |
788 | rc = ep->rep_connected; | |
0a90487b | 789 | goto out; |
c56c65fb TT |
790 | } |
791 | ||
0a90487b CL |
792 | dprintk("RPC: %s: connected\n", __func__); |
793 | extras = r_xprt->rx_buf.rb_bc_srv_max_requests; | |
794 | if (extras) | |
795 | rpcrdma_ep_post_extra_recv(r_xprt, extras); | |
796 | ||
c56c65fb TT |
797 | out: |
798 | if (rc) | |
799 | ep->rep_connected = rc; | |
1890896b CL |
800 | |
801 | out_noupdate: | |
c56c65fb TT |
802 | return rc; |
803 | } | |
804 | ||
805 | /* | |
806 | * rpcrdma_ep_disconnect | |
807 | * | |
808 | * This is separate from destroy to facilitate the ability | |
809 | * to reconnect without recreating the endpoint. | |
810 | * | |
811 | * This call is not reentrant, and must not be made in parallel | |
812 | * on the same endpoint. | |
813 | */ | |
282191cb | 814 | void |
c56c65fb TT |
815 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
816 | { | |
817 | int rc; | |
818 | ||
c56c65fb TT |
819 | rc = rdma_disconnect(ia->ri_id); |
820 | if (!rc) { | |
821 | /* returns without wait if not connected */ | |
822 | wait_event_interruptible(ep->rep_connect_wait, | |
823 | ep->rep_connected != 1); | |
824 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
825 | (ep->rep_connected == 1) ? "still " : "dis"); | |
826 | } else { | |
827 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
828 | ep->rep_connected = rc; | |
829 | } | |
550d7502 CL |
830 | |
831 | ib_drain_qp(ia->ri_id->qp); | |
c56c65fb TT |
832 | } |
833 | ||
ae72950a CL |
834 | /* Fixed-size circular FIFO queue. This implementation is wait-free and |
835 | * lock-free. | |
836 | * | |
837 | * Consumer is the code path that posts Sends. This path dequeues a | |
838 | * sendctx for use by a Send operation. Multiple consumer threads | |
839 | * are serialized by the RPC transport lock, which allows only one | |
840 | * ->send_request call at a time. | |
841 | * | |
842 | * Producer is the code path that handles Send completions. This path | |
843 | * enqueues a sendctx that has been completed. Multiple producer | |
844 | * threads are serialized by the ib_poll_cq() function. | |
845 | */ | |
846 | ||
847 | /* rpcrdma_sendctxs_destroy() assumes caller has already quiesced | |
848 | * queue activity, and ib_drain_qp has flushed all remaining Send | |
849 | * requests. | |
850 | */ | |
851 | static void rpcrdma_sendctxs_destroy(struct rpcrdma_buffer *buf) | |
852 | { | |
853 | unsigned long i; | |
854 | ||
855 | for (i = 0; i <= buf->rb_sc_last; i++) | |
856 | kfree(buf->rb_sc_ctxs[i]); | |
857 | kfree(buf->rb_sc_ctxs); | |
858 | } | |
859 | ||
860 | static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ia *ia) | |
861 | { | |
862 | struct rpcrdma_sendctx *sc; | |
863 | ||
864 | sc = kzalloc(sizeof(*sc) + | |
865 | ia->ri_max_send_sges * sizeof(struct ib_sge), | |
866 | GFP_KERNEL); | |
867 | if (!sc) | |
868 | return NULL; | |
869 | ||
870 | sc->sc_wr.wr_cqe = &sc->sc_cqe; | |
871 | sc->sc_wr.sg_list = sc->sc_sges; | |
872 | sc->sc_wr.opcode = IB_WR_SEND; | |
873 | sc->sc_cqe.done = rpcrdma_wc_send; | |
874 | return sc; | |
875 | } | |
876 | ||
877 | static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt) | |
878 | { | |
879 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
880 | struct rpcrdma_sendctx *sc; | |
881 | unsigned long i; | |
882 | ||
883 | /* Maximum number of concurrent outstanding Send WRs. Capping | |
884 | * the circular queue size stops Send Queue overflow by causing | |
885 | * the ->send_request call to fail temporarily before too many | |
886 | * Sends are posted. | |
887 | */ | |
888 | i = buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS; | |
889 | dprintk("RPC: %s: allocating %lu send_ctxs\n", __func__, i); | |
890 | buf->rb_sc_ctxs = kcalloc(i, sizeof(sc), GFP_KERNEL); | |
891 | if (!buf->rb_sc_ctxs) | |
892 | return -ENOMEM; | |
893 | ||
894 | buf->rb_sc_last = i - 1; | |
895 | for (i = 0; i <= buf->rb_sc_last; i++) { | |
896 | sc = rpcrdma_sendctx_create(&r_xprt->rx_ia); | |
897 | if (!sc) | |
898 | goto out_destroy; | |
899 | ||
900 | sc->sc_xprt = r_xprt; | |
901 | buf->rb_sc_ctxs[i] = sc; | |
902 | } | |
903 | ||
904 | return 0; | |
905 | ||
906 | out_destroy: | |
907 | rpcrdma_sendctxs_destroy(buf); | |
908 | return -ENOMEM; | |
909 | } | |
910 | ||
911 | /* The sendctx queue is not guaranteed to have a size that is a | |
912 | * power of two, thus the helpers in circ_buf.h cannot be used. | |
913 | * The other option is to use modulus (%), which can be expensive. | |
914 | */ | |
915 | static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf, | |
916 | unsigned long item) | |
917 | { | |
918 | return likely(item < buf->rb_sc_last) ? item + 1 : 0; | |
919 | } | |
920 | ||
921 | /** | |
922 | * rpcrdma_sendctx_get_locked - Acquire a send context | |
923 | * @buf: transport buffers from which to acquire an unused context | |
924 | * | |
925 | * Returns pointer to a free send completion context; or NULL if | |
926 | * the queue is empty. | |
927 | * | |
928 | * Usage: Called to acquire an SGE array before preparing a Send WR. | |
929 | * | |
930 | * The caller serializes calls to this function (per rpcrdma_buffer), | |
931 | * and provides an effective memory barrier that flushes the new value | |
932 | * of rb_sc_head. | |
933 | */ | |
934 | struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf) | |
935 | { | |
936 | struct rpcrdma_xprt *r_xprt; | |
937 | struct rpcrdma_sendctx *sc; | |
938 | unsigned long next_head; | |
939 | ||
940 | next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head); | |
941 | ||
942 | if (next_head == READ_ONCE(buf->rb_sc_tail)) | |
943 | goto out_emptyq; | |
944 | ||
945 | /* ORDER: item must be accessed _before_ head is updated */ | |
946 | sc = buf->rb_sc_ctxs[next_head]; | |
947 | ||
948 | /* Releasing the lock in the caller acts as a memory | |
949 | * barrier that flushes rb_sc_head. | |
950 | */ | |
951 | buf->rb_sc_head = next_head; | |
952 | ||
953 | return sc; | |
954 | ||
955 | out_emptyq: | |
956 | /* The queue is "empty" if there have not been enough Send | |
957 | * completions recently. This is a sign the Send Queue is | |
958 | * backing up. Cause the caller to pause and try again. | |
959 | */ | |
960 | dprintk("RPC: %s: empty sendctx queue\n", __func__); | |
961 | r_xprt = container_of(buf, struct rpcrdma_xprt, rx_buf); | |
962 | r_xprt->rx_stats.empty_sendctx_q++; | |
963 | return NULL; | |
964 | } | |
965 | ||
966 | /** | |
967 | * rpcrdma_sendctx_put_locked - Release a send context | |
968 | * @sc: send context to release | |
969 | * | |
970 | * Usage: Called from Send completion to return a sendctxt | |
971 | * to the queue. | |
972 | * | |
973 | * The caller serializes calls to this function (per rpcrdma_buffer). | |
974 | */ | |
975 | void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc) | |
976 | { | |
977 | struct rpcrdma_buffer *buf = &sc->sc_xprt->rx_buf; | |
978 | unsigned long next_tail; | |
979 | ||
980 | /* Unmap SGEs of previously completed by unsignaled | |
981 | * Sends by walking up the queue until @sc is found. | |
982 | */ | |
983 | next_tail = buf->rb_sc_tail; | |
984 | do { | |
985 | next_tail = rpcrdma_sendctx_next(buf, next_tail); | |
986 | ||
987 | /* ORDER: item must be accessed _before_ tail is updated */ | |
988 | rpcrdma_unmap_sendctx(buf->rb_sc_ctxs[next_tail]); | |
989 | ||
990 | } while (buf->rb_sc_ctxs[next_tail] != sc); | |
991 | ||
992 | /* Paired with READ_ONCE */ | |
993 | smp_store_release(&buf->rb_sc_tail, next_tail); | |
994 | } | |
995 | ||
505bbe64 CL |
996 | static void |
997 | rpcrdma_mr_recovery_worker(struct work_struct *work) | |
998 | { | |
999 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, | |
1000 | rb_recovery_worker.work); | |
1001 | struct rpcrdma_mw *mw; | |
1002 | ||
1003 | spin_lock(&buf->rb_recovery_lock); | |
1004 | while (!list_empty(&buf->rb_stale_mrs)) { | |
9a5c63e9 | 1005 | mw = rpcrdma_pop_mw(&buf->rb_stale_mrs); |
505bbe64 CL |
1006 | spin_unlock(&buf->rb_recovery_lock); |
1007 | ||
1008 | dprintk("RPC: %s: recovering MR %p\n", __func__, mw); | |
1009 | mw->mw_xprt->rx_ia.ri_ops->ro_recover_mr(mw); | |
1010 | ||
1011 | spin_lock(&buf->rb_recovery_lock); | |
53d78523 | 1012 | } |
505bbe64 CL |
1013 | spin_unlock(&buf->rb_recovery_lock); |
1014 | } | |
1015 | ||
1016 | void | |
1017 | rpcrdma_defer_mr_recovery(struct rpcrdma_mw *mw) | |
1018 | { | |
1019 | struct rpcrdma_xprt *r_xprt = mw->mw_xprt; | |
1020 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
1021 | ||
1022 | spin_lock(&buf->rb_recovery_lock); | |
9a5c63e9 | 1023 | rpcrdma_push_mw(mw, &buf->rb_stale_mrs); |
505bbe64 CL |
1024 | spin_unlock(&buf->rb_recovery_lock); |
1025 | ||
1026 | schedule_delayed_work(&buf->rb_recovery_worker, 0); | |
1027 | } | |
1028 | ||
e2ac236c CL |
1029 | static void |
1030 | rpcrdma_create_mrs(struct rpcrdma_xprt *r_xprt) | |
1031 | { | |
1032 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
1033 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
1034 | unsigned int count; | |
1035 | LIST_HEAD(free); | |
1036 | LIST_HEAD(all); | |
1037 | ||
1038 | for (count = 0; count < 32; count++) { | |
1039 | struct rpcrdma_mw *mw; | |
1040 | int rc; | |
1041 | ||
1042 | mw = kzalloc(sizeof(*mw), GFP_KERNEL); | |
1043 | if (!mw) | |
1044 | break; | |
1045 | ||
1046 | rc = ia->ri_ops->ro_init_mr(ia, mw); | |
1047 | if (rc) { | |
1048 | kfree(mw); | |
1049 | break; | |
1050 | } | |
1051 | ||
1052 | mw->mw_xprt = r_xprt; | |
1053 | ||
1054 | list_add(&mw->mw_list, &free); | |
1055 | list_add(&mw->mw_all, &all); | |
1056 | } | |
1057 | ||
1058 | spin_lock(&buf->rb_mwlock); | |
1059 | list_splice(&free, &buf->rb_mws); | |
1060 | list_splice(&all, &buf->rb_all); | |
1061 | r_xprt->rx_stats.mrs_allocated += count; | |
1062 | spin_unlock(&buf->rb_mwlock); | |
1063 | ||
1064 | dprintk("RPC: %s: created %u MRs\n", __func__, count); | |
1065 | } | |
1066 | ||
1067 | static void | |
1068 | rpcrdma_mr_refresh_worker(struct work_struct *work) | |
1069 | { | |
1070 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, | |
1071 | rb_refresh_worker.work); | |
1072 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, | |
1073 | rx_buf); | |
1074 | ||
1075 | rpcrdma_create_mrs(r_xprt); | |
1076 | } | |
1077 | ||
f531a5db | 1078 | struct rpcrdma_req * |
1392402c CL |
1079 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) |
1080 | { | |
f531a5db | 1081 | struct rpcrdma_buffer *buffer = &r_xprt->rx_buf; |
1392402c | 1082 | struct rpcrdma_req *req; |
1392402c | 1083 | |
85275c87 | 1084 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 1085 | if (req == NULL) |
85275c87 | 1086 | return ERR_PTR(-ENOMEM); |
1392402c | 1087 | |
f531a5db CL |
1088 | spin_lock(&buffer->rb_reqslock); |
1089 | list_add(&req->rl_all, &buffer->rb_allreqs); | |
1090 | spin_unlock(&buffer->rb_reqslock); | |
1392402c | 1091 | req->rl_buffer = &r_xprt->rx_buf; |
9d6b0409 | 1092 | INIT_LIST_HEAD(&req->rl_registered); |
1392402c | 1093 | return req; |
1392402c CL |
1094 | } |
1095 | ||
f531a5db | 1096 | struct rpcrdma_rep * |
1392402c CL |
1097 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) |
1098 | { | |
1099 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1392402c CL |
1100 | struct rpcrdma_rep *rep; |
1101 | int rc; | |
1102 | ||
1103 | rc = -ENOMEM; | |
6b1184cd | 1104 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
1105 | if (rep == NULL) |
1106 | goto out; | |
1392402c | 1107 | |
13650c23 | 1108 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize, |
99ef4db3 | 1109 | DMA_FROM_DEVICE, GFP_KERNEL); |
6b1184cd CL |
1110 | if (IS_ERR(rep->rr_rdmabuf)) { |
1111 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 1112 | goto out_free; |
6b1184cd | 1113 | } |
96f8778f CL |
1114 | xdr_buf_init(&rep->rr_hdrbuf, rep->rr_rdmabuf->rg_base, |
1115 | rdmab_length(rep->rr_rdmabuf)); | |
1392402c | 1116 | |
1519e969 | 1117 | rep->rr_cqe.done = rpcrdma_wc_receive; |
fed171b3 | 1118 | rep->rr_rxprt = r_xprt; |
d8f532d2 | 1119 | INIT_WORK(&rep->rr_work, rpcrdma_deferred_completion); |
6ea8e711 CL |
1120 | rep->rr_recv_wr.next = NULL; |
1121 | rep->rr_recv_wr.wr_cqe = &rep->rr_cqe; | |
1122 | rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; | |
1123 | rep->rr_recv_wr.num_sge = 1; | |
1392402c CL |
1124 | return rep; |
1125 | ||
1126 | out_free: | |
1127 | kfree(rep); | |
1128 | out: | |
1129 | return ERR_PTR(rc); | |
1130 | } | |
1131 | ||
c56c65fb | 1132 | int |
ac920d04 | 1133 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 1134 | { |
ac920d04 | 1135 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
c56c65fb TT |
1136 | int i, rc; |
1137 | ||
1e465fd4 | 1138 | buf->rb_max_requests = r_xprt->rx_data.max_requests; |
f531a5db | 1139 | buf->rb_bc_srv_max_requests = 0; |
e2ac236c | 1140 | spin_lock_init(&buf->rb_mwlock); |
505bbe64 CL |
1141 | spin_lock_init(&buf->rb_lock); |
1142 | spin_lock_init(&buf->rb_recovery_lock); | |
e2ac236c CL |
1143 | INIT_LIST_HEAD(&buf->rb_mws); |
1144 | INIT_LIST_HEAD(&buf->rb_all); | |
505bbe64 | 1145 | INIT_LIST_HEAD(&buf->rb_stale_mrs); |
e2ac236c CL |
1146 | INIT_DELAYED_WORK(&buf->rb_refresh_worker, |
1147 | rpcrdma_mr_refresh_worker); | |
505bbe64 CL |
1148 | INIT_DELAYED_WORK(&buf->rb_recovery_worker, |
1149 | rpcrdma_mr_recovery_worker); | |
c56c65fb | 1150 | |
e2ac236c | 1151 | rpcrdma_create_mrs(r_xprt); |
c56c65fb | 1152 | |
1e465fd4 | 1153 | INIT_LIST_HEAD(&buf->rb_send_bufs); |
f531a5db CL |
1154 | INIT_LIST_HEAD(&buf->rb_allreqs); |
1155 | spin_lock_init(&buf->rb_reqslock); | |
c56c65fb TT |
1156 | for (i = 0; i < buf->rb_max_requests; i++) { |
1157 | struct rpcrdma_req *req; | |
c56c65fb | 1158 | |
1392402c CL |
1159 | req = rpcrdma_create_req(r_xprt); |
1160 | if (IS_ERR(req)) { | |
c56c65fb TT |
1161 | dprintk("RPC: %s: request buffer %d alloc" |
1162 | " failed\n", __func__, i); | |
1392402c | 1163 | rc = PTR_ERR(req); |
c56c65fb TT |
1164 | goto out; |
1165 | } | |
a80d66c9 | 1166 | list_add(&req->rl_list, &buf->rb_send_bufs); |
1e465fd4 CL |
1167 | } |
1168 | ||
1169 | INIT_LIST_HEAD(&buf->rb_recv_bufs); | |
05c97466 | 1170 | for (i = 0; i < buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS; i++) { |
1e465fd4 | 1171 | struct rpcrdma_rep *rep; |
c56c65fb | 1172 | |
1392402c CL |
1173 | rep = rpcrdma_create_rep(r_xprt); |
1174 | if (IS_ERR(rep)) { | |
c56c65fb TT |
1175 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
1176 | __func__, i); | |
1392402c | 1177 | rc = PTR_ERR(rep); |
c56c65fb TT |
1178 | goto out; |
1179 | } | |
1e465fd4 | 1180 | list_add(&rep->rr_list, &buf->rb_recv_bufs); |
c56c65fb | 1181 | } |
1392402c | 1182 | |
ae72950a CL |
1183 | rc = rpcrdma_sendctxs_create(r_xprt); |
1184 | if (rc) | |
1185 | goto out; | |
1186 | ||
c56c65fb TT |
1187 | return 0; |
1188 | out: | |
1189 | rpcrdma_buffer_destroy(buf); | |
1190 | return rc; | |
1191 | } | |
1192 | ||
1e465fd4 CL |
1193 | static struct rpcrdma_req * |
1194 | rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf) | |
1195 | { | |
1196 | struct rpcrdma_req *req; | |
1197 | ||
1198 | req = list_first_entry(&buf->rb_send_bufs, | |
a80d66c9 | 1199 | struct rpcrdma_req, rl_list); |
431af645 | 1200 | list_del_init(&req->rl_list); |
1e465fd4 CL |
1201 | return req; |
1202 | } | |
1203 | ||
1204 | static struct rpcrdma_rep * | |
1205 | rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf) | |
1206 | { | |
1207 | struct rpcrdma_rep *rep; | |
1208 | ||
1209 | rep = list_first_entry(&buf->rb_recv_bufs, | |
1210 | struct rpcrdma_rep, rr_list); | |
1211 | list_del(&rep->rr_list); | |
1212 | return rep; | |
1213 | } | |
1214 | ||
1392402c | 1215 | static void |
13650c23 | 1216 | rpcrdma_destroy_rep(struct rpcrdma_rep *rep) |
1392402c | 1217 | { |
13650c23 | 1218 | rpcrdma_free_regbuf(rep->rr_rdmabuf); |
1392402c CL |
1219 | kfree(rep); |
1220 | } | |
1221 | ||
f531a5db | 1222 | void |
13650c23 | 1223 | rpcrdma_destroy_req(struct rpcrdma_req *req) |
1392402c | 1224 | { |
13650c23 CL |
1225 | rpcrdma_free_regbuf(req->rl_recvbuf); |
1226 | rpcrdma_free_regbuf(req->rl_sendbuf); | |
1227 | rpcrdma_free_regbuf(req->rl_rdmabuf); | |
1392402c CL |
1228 | kfree(req); |
1229 | } | |
1230 | ||
e2ac236c CL |
1231 | static void |
1232 | rpcrdma_destroy_mrs(struct rpcrdma_buffer *buf) | |
1233 | { | |
1234 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, | |
1235 | rx_buf); | |
1236 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); | |
1237 | struct rpcrdma_mw *mw; | |
1238 | unsigned int count; | |
1239 | ||
1240 | count = 0; | |
1241 | spin_lock(&buf->rb_mwlock); | |
1242 | while (!list_empty(&buf->rb_all)) { | |
1243 | mw = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all); | |
1244 | list_del(&mw->mw_all); | |
1245 | ||
1246 | spin_unlock(&buf->rb_mwlock); | |
1247 | ia->ri_ops->ro_release_mr(mw); | |
1248 | count++; | |
1249 | spin_lock(&buf->rb_mwlock); | |
1250 | } | |
1251 | spin_unlock(&buf->rb_mwlock); | |
1252 | r_xprt->rx_stats.mrs_allocated = 0; | |
1253 | ||
1254 | dprintk("RPC: %s: released %u MRs\n", __func__, count); | |
1255 | } | |
1256 | ||
c56c65fb TT |
1257 | void |
1258 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1259 | { | |
505bbe64 | 1260 | cancel_delayed_work_sync(&buf->rb_recovery_worker); |
9378b274 | 1261 | cancel_delayed_work_sync(&buf->rb_refresh_worker); |
505bbe64 | 1262 | |
ae72950a CL |
1263 | rpcrdma_sendctxs_destroy(buf); |
1264 | ||
1e465fd4 CL |
1265 | while (!list_empty(&buf->rb_recv_bufs)) { |
1266 | struct rpcrdma_rep *rep; | |
c56c65fb | 1267 | |
1e465fd4 | 1268 | rep = rpcrdma_buffer_get_rep_locked(buf); |
13650c23 | 1269 | rpcrdma_destroy_rep(rep); |
c56c65fb | 1270 | } |
05c97466 | 1271 | buf->rb_send_count = 0; |
c56c65fb | 1272 | |
f531a5db CL |
1273 | spin_lock(&buf->rb_reqslock); |
1274 | while (!list_empty(&buf->rb_allreqs)) { | |
1e465fd4 | 1275 | struct rpcrdma_req *req; |
4034ba04 | 1276 | |
f531a5db CL |
1277 | req = list_first_entry(&buf->rb_allreqs, |
1278 | struct rpcrdma_req, rl_all); | |
1279 | list_del(&req->rl_all); | |
1280 | ||
1281 | spin_unlock(&buf->rb_reqslock); | |
13650c23 | 1282 | rpcrdma_destroy_req(req); |
f531a5db | 1283 | spin_lock(&buf->rb_reqslock); |
1e465fd4 | 1284 | } |
f531a5db | 1285 | spin_unlock(&buf->rb_reqslock); |
05c97466 | 1286 | buf->rb_recv_count = 0; |
4034ba04 | 1287 | |
e2ac236c | 1288 | rpcrdma_destroy_mrs(buf); |
c56c65fb TT |
1289 | } |
1290 | ||
346aa66b CL |
1291 | struct rpcrdma_mw * |
1292 | rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) | |
c2922c02 | 1293 | { |
346aa66b CL |
1294 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
1295 | struct rpcrdma_mw *mw = NULL; | |
346aa66b | 1296 | |
58d1dcf5 | 1297 | spin_lock(&buf->rb_mwlock); |
9a5c63e9 CL |
1298 | if (!list_empty(&buf->rb_mws)) |
1299 | mw = rpcrdma_pop_mw(&buf->rb_mws); | |
58d1dcf5 | 1300 | spin_unlock(&buf->rb_mwlock); |
346aa66b CL |
1301 | |
1302 | if (!mw) | |
e2ac236c | 1303 | goto out_nomws; |
4b196dc6 | 1304 | mw->mw_flags = 0; |
346aa66b | 1305 | return mw; |
e2ac236c CL |
1306 | |
1307 | out_nomws: | |
1308 | dprintk("RPC: %s: no MWs available\n", __func__); | |
bebd0318 CL |
1309 | if (r_xprt->rx_ep.rep_connected != -ENODEV) |
1310 | schedule_delayed_work(&buf->rb_refresh_worker, 0); | |
e2ac236c CL |
1311 | |
1312 | /* Allow the reply handler and refresh worker to run */ | |
1313 | cond_resched(); | |
1314 | ||
1315 | return NULL; | |
c2922c02 CL |
1316 | } |
1317 | ||
346aa66b CL |
1318 | void |
1319 | rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw) | |
c2922c02 | 1320 | { |
346aa66b | 1321 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
c2922c02 | 1322 | |
58d1dcf5 | 1323 | spin_lock(&buf->rb_mwlock); |
9a5c63e9 | 1324 | rpcrdma_push_mw(mw, &buf->rb_mws); |
58d1dcf5 | 1325 | spin_unlock(&buf->rb_mwlock); |
c2922c02 CL |
1326 | } |
1327 | ||
05c97466 CL |
1328 | static struct rpcrdma_rep * |
1329 | rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers) | |
1330 | { | |
1331 | /* If an RPC previously completed without a reply (say, a | |
1332 | * credential problem or a soft timeout occurs) then hold off | |
1333 | * on supplying more Receive buffers until the number of new | |
1334 | * pending RPCs catches up to the number of posted Receives. | |
1335 | */ | |
1336 | if (unlikely(buffers->rb_send_count < buffers->rb_recv_count)) | |
1337 | return NULL; | |
1338 | ||
1339 | if (unlikely(list_empty(&buffers->rb_recv_bufs))) | |
1340 | return NULL; | |
1341 | buffers->rb_recv_count++; | |
1342 | return rpcrdma_buffer_get_rep_locked(buffers); | |
1343 | } | |
1344 | ||
c56c65fb TT |
1345 | /* |
1346 | * Get a set of request/reply buffers. | |
78d506e1 CL |
1347 | * |
1348 | * Reply buffer (if available) is attached to send buffer upon return. | |
c56c65fb TT |
1349 | */ |
1350 | struct rpcrdma_req * | |
1351 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1352 | { | |
1353 | struct rpcrdma_req *req; | |
c14d86e5 | 1354 | |
a5b027e1 | 1355 | spin_lock(&buffers->rb_lock); |
1e465fd4 CL |
1356 | if (list_empty(&buffers->rb_send_bufs)) |
1357 | goto out_reqbuf; | |
05c97466 | 1358 | buffers->rb_send_count++; |
1e465fd4 | 1359 | req = rpcrdma_buffer_get_req_locked(buffers); |
05c97466 | 1360 | req->rl_reply = rpcrdma_buffer_get_rep(buffers); |
a5b027e1 | 1361 | spin_unlock(&buffers->rb_lock); |
1e465fd4 | 1362 | return req; |
ddb6bebc | 1363 | |
1e465fd4 | 1364 | out_reqbuf: |
a5b027e1 | 1365 | spin_unlock(&buffers->rb_lock); |
78d506e1 | 1366 | pr_warn("RPC: %s: out of request buffers\n", __func__); |
1e465fd4 | 1367 | return NULL; |
c56c65fb TT |
1368 | } |
1369 | ||
1370 | /* | |
1371 | * Put request/reply buffers back into pool. | |
1372 | * Pre-decrement counter/array index. | |
1373 | */ | |
1374 | void | |
1375 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1376 | { | |
1377 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1e465fd4 | 1378 | struct rpcrdma_rep *rep = req->rl_reply; |
c56c65fb | 1379 | |
1e465fd4 CL |
1380 | req->rl_reply = NULL; |
1381 | ||
a5b027e1 | 1382 | spin_lock(&buffers->rb_lock); |
05c97466 | 1383 | buffers->rb_send_count--; |
a80d66c9 | 1384 | list_add_tail(&req->rl_list, &buffers->rb_send_bufs); |
05c97466 CL |
1385 | if (rep) { |
1386 | buffers->rb_recv_count--; | |
1e465fd4 | 1387 | list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs); |
05c97466 | 1388 | } |
a5b027e1 | 1389 | spin_unlock(&buffers->rb_lock); |
c56c65fb TT |
1390 | } |
1391 | ||
1392 | /* | |
1393 | * Recover reply buffers from pool. | |
1e465fd4 | 1394 | * This happens when recovering from disconnect. |
c56c65fb TT |
1395 | */ |
1396 | void | |
1397 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1398 | { | |
1399 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
c56c65fb | 1400 | |
a5b027e1 | 1401 | spin_lock(&buffers->rb_lock); |
05c97466 | 1402 | req->rl_reply = rpcrdma_buffer_get_rep(buffers); |
a5b027e1 | 1403 | spin_unlock(&buffers->rb_lock); |
c56c65fb TT |
1404 | } |
1405 | ||
1406 | /* | |
1407 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1408 | * request. This happens in error conditions. |
c56c65fb TT |
1409 | */ |
1410 | void | |
1411 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1412 | { | |
fed171b3 | 1413 | struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf; |
c56c65fb | 1414 | |
a5b027e1 | 1415 | spin_lock(&buffers->rb_lock); |
05c97466 | 1416 | buffers->rb_recv_count--; |
1e465fd4 | 1417 | list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs); |
a5b027e1 | 1418 | spin_unlock(&buffers->rb_lock); |
c56c65fb TT |
1419 | } |
1420 | ||
9128c3e7 | 1421 | /** |
99ef4db3 | 1422 | * rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers |
9128c3e7 | 1423 | * @size: size of buffer to be allocated, in bytes |
99ef4db3 | 1424 | * @direction: direction of data movement |
9128c3e7 CL |
1425 | * @flags: GFP flags |
1426 | * | |
54cbd6b0 CL |
1427 | * Returns an ERR_PTR, or a pointer to a regbuf, a buffer that |
1428 | * can be persistently DMA-mapped for I/O. | |
9128c3e7 CL |
1429 | * |
1430 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
99ef4db3 CL |
1431 | * receiving the payload of RDMA RECV operations. During Long Calls |
1432 | * or Replies they may be registered externally via ro_map. | |
9128c3e7 CL |
1433 | */ |
1434 | struct rpcrdma_regbuf * | |
13650c23 CL |
1435 | rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction, |
1436 | gfp_t flags) | |
9128c3e7 CL |
1437 | { |
1438 | struct rpcrdma_regbuf *rb; | |
9128c3e7 | 1439 | |
9128c3e7 CL |
1440 | rb = kmalloc(sizeof(*rb) + size, flags); |
1441 | if (rb == NULL) | |
54cbd6b0 | 1442 | return ERR_PTR(-ENOMEM); |
9128c3e7 | 1443 | |
54cbd6b0 | 1444 | rb->rg_device = NULL; |
99ef4db3 | 1445 | rb->rg_direction = direction; |
54cbd6b0 | 1446 | rb->rg_iov.length = size; |
9128c3e7 CL |
1447 | |
1448 | return rb; | |
54cbd6b0 | 1449 | } |
9128c3e7 | 1450 | |
54cbd6b0 CL |
1451 | /** |
1452 | * __rpcrdma_map_regbuf - DMA-map a regbuf | |
1453 | * @ia: controlling rpcrdma_ia | |
1454 | * @rb: regbuf to be mapped | |
1455 | */ | |
1456 | bool | |
1457 | __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1458 | { | |
91a10c52 CL |
1459 | struct ib_device *device = ia->ri_device; |
1460 | ||
54cbd6b0 CL |
1461 | if (rb->rg_direction == DMA_NONE) |
1462 | return false; | |
1463 | ||
91a10c52 | 1464 | rb->rg_iov.addr = ib_dma_map_single(device, |
54cbd6b0 CL |
1465 | (void *)rb->rg_base, |
1466 | rdmab_length(rb), | |
1467 | rb->rg_direction); | |
91a10c52 | 1468 | if (ib_dma_mapping_error(device, rdmab_addr(rb))) |
54cbd6b0 CL |
1469 | return false; |
1470 | ||
91a10c52 | 1471 | rb->rg_device = device; |
54cbd6b0 CL |
1472 | rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey; |
1473 | return true; | |
1474 | } | |
1475 | ||
1476 | static void | |
1477 | rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb) | |
1478 | { | |
1479 | if (!rpcrdma_regbuf_is_mapped(rb)) | |
1480 | return; | |
1481 | ||
1482 | ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb), | |
1483 | rdmab_length(rb), rb->rg_direction); | |
1484 | rb->rg_device = NULL; | |
9128c3e7 CL |
1485 | } |
1486 | ||
1487 | /** | |
1488 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
9128c3e7 CL |
1489 | * @rb: regbuf to be deregistered and freed |
1490 | */ | |
1491 | void | |
13650c23 | 1492 | rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb) |
9128c3e7 | 1493 | { |
e531dcab CL |
1494 | if (!rb) |
1495 | return; | |
1496 | ||
54cbd6b0 | 1497 | rpcrdma_dma_unmap_regbuf(rb); |
e531dcab | 1498 | kfree(rb); |
9128c3e7 CL |
1499 | } |
1500 | ||
c56c65fb TT |
1501 | /* |
1502 | * Prepost any receive buffer, then post send. | |
1503 | * | |
1504 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1505 | */ | |
1506 | int | |
1507 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1508 | struct rpcrdma_ep *ep, | |
1509 | struct rpcrdma_req *req) | |
1510 | { | |
ae72950a | 1511 | struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr; |
90aab602 | 1512 | struct ib_send_wr *send_wr_fail; |
655fec69 | 1513 | int rc; |
c56c65fb | 1514 | |
90aab602 CL |
1515 | if (req->rl_reply) { |
1516 | rc = rpcrdma_ep_post_recv(ia, req->rl_reply); | |
c56c65fb | 1517 | if (rc) |
7a89f9c6 | 1518 | return rc; |
c56c65fb TT |
1519 | req->rl_reply = NULL; |
1520 | } | |
1521 | ||
b3221d6a | 1522 | dprintk("RPC: %s: posting %d s/g entries\n", |
90aab602 | 1523 | __func__, send_wr->num_sge); |
c56c65fb | 1524 | |
01bb35c8 CL |
1525 | if (!ep->rep_send_count || |
1526 | test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags)) { | |
ae72950a CL |
1527 | send_wr->send_flags |= IB_SEND_SIGNALED; |
1528 | ep->rep_send_count = ep->rep_send_batch; | |
1529 | } else { | |
1530 | send_wr->send_flags &= ~IB_SEND_SIGNALED; | |
1531 | --ep->rep_send_count; | |
1532 | } | |
90aab602 | 1533 | rc = ib_post_send(ia->ri_id->qp, send_wr, &send_wr_fail); |
c56c65fb | 1534 | if (rc) |
7a89f9c6 CL |
1535 | goto out_postsend_err; |
1536 | return 0; | |
1537 | ||
1538 | out_postsend_err: | |
1539 | pr_err("rpcrdma: RDMA Send ib_post_send returned %i\n", rc); | |
1540 | return -ENOTCONN; | |
c56c65fb TT |
1541 | } |
1542 | ||
c56c65fb TT |
1543 | int |
1544 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
c56c65fb TT |
1545 | struct rpcrdma_rep *rep) |
1546 | { | |
6ea8e711 | 1547 | struct ib_recv_wr *recv_wr_fail; |
c56c65fb TT |
1548 | int rc; |
1549 | ||
54cbd6b0 CL |
1550 | if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf)) |
1551 | goto out_map; | |
6ea8e711 | 1552 | rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail); |
c56c65fb | 1553 | if (rc) |
7a89f9c6 CL |
1554 | goto out_postrecv; |
1555 | return 0; | |
1556 | ||
54cbd6b0 CL |
1557 | out_map: |
1558 | pr_err("rpcrdma: failed to DMA map the Receive buffer\n"); | |
1559 | return -EIO; | |
1560 | ||
7a89f9c6 CL |
1561 | out_postrecv: |
1562 | pr_err("rpcrdma: ib_post_recv returned %i\n", rc); | |
1563 | return -ENOTCONN; | |
c56c65fb | 1564 | } |
43e95988 | 1565 | |
f531a5db CL |
1566 | /** |
1567 | * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests | |
1568 | * @r_xprt: transport associated with these backchannel resources | |
1569 | * @min_reqs: minimum number of incoming requests expected | |
1570 | * | |
1571 | * Returns zero if all requested buffers were posted, or a negative errno. | |
1572 | */ | |
1573 | int | |
1574 | rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count) | |
1575 | { | |
1576 | struct rpcrdma_buffer *buffers = &r_xprt->rx_buf; | |
1577 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
f531a5db | 1578 | struct rpcrdma_rep *rep; |
f531a5db CL |
1579 | int rc; |
1580 | ||
1581 | while (count--) { | |
9b06688b | 1582 | spin_lock(&buffers->rb_lock); |
f531a5db CL |
1583 | if (list_empty(&buffers->rb_recv_bufs)) |
1584 | goto out_reqbuf; | |
1585 | rep = rpcrdma_buffer_get_rep_locked(buffers); | |
9b06688b | 1586 | spin_unlock(&buffers->rb_lock); |
f531a5db | 1587 | |
b157380a | 1588 | rc = rpcrdma_ep_post_recv(ia, rep); |
f531a5db CL |
1589 | if (rc) |
1590 | goto out_rc; | |
1591 | } | |
1592 | ||
1593 | return 0; | |
1594 | ||
1595 | out_reqbuf: | |
9b06688b | 1596 | spin_unlock(&buffers->rb_lock); |
f531a5db CL |
1597 | pr_warn("%s: no extra receive buffers\n", __func__); |
1598 | return -ENOMEM; | |
1599 | ||
1600 | out_rc: | |
1601 | rpcrdma_recv_buffer_put(rep); | |
1602 | return rc; | |
1603 | } |