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a2268cfb | 1 | // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause |
f58851e6 | 2 | /* |
62b56a67 | 3 | * Copyright (c) 2014-2017 Oracle. All rights reserved. |
c56c65fb TT |
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. | |
f58851e6 TT |
40 | */ |
41 | ||
c56c65fb TT |
42 | /* |
43 | * verbs.c | |
44 | * | |
45 | * Encapsulates the major functions managing: | |
46 | * o adapters | |
47 | * o endpoints | |
48 | * o connections | |
49 | * o buffer memory | |
50 | */ | |
51 | ||
a6b7a407 | 52 | #include <linux/interrupt.h> |
5a0e3ad6 | 53 | #include <linux/slab.h> |
0dd39cae | 54 | #include <linux/sunrpc/addr.h> |
05c97466 | 55 | #include <linux/sunrpc/svc_rdma.h> |
ae72950a CL |
56 | |
57 | #include <asm-generic/barrier.h> | |
65866f82 | 58 | #include <asm/bitops.h> |
56a6bd15 | 59 | |
0a90487b | 60 | #include <rdma/ib_cm.h> |
c56c65fb | 61 | |
f58851e6 | 62 | #include "xprt_rdma.h" |
b6e717cb | 63 | #include <trace/events/rpcrdma.h> |
f58851e6 | 64 | |
c56c65fb TT |
65 | /* |
66 | * Globals/Macros | |
67 | */ | |
68 | ||
f895b252 | 69 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
70 | # define RPCDBG_FACILITY RPCDBG_TRANS |
71 | #endif | |
72 | ||
73 | /* | |
74 | * internal functions | |
75 | */ | |
efd81e90 | 76 | static void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc); |
96ceddea CL |
77 | static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt); |
78 | static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf); | |
7c8d9e7c | 79 | static int rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt, bool temp); |
bebd0318 | 80 | static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb); |
6ceea368 | 81 | static void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp); |
c56c65fb | 82 | |
6d2d0ee2 CL |
83 | /* Wait for outstanding transport work to finish. |
84 | */ | |
85 | static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt) | |
c56c65fb | 86 | { |
6d2d0ee2 CL |
87 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
88 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
c56c65fb | 89 | |
6d2d0ee2 CL |
90 | /* Flush Receives, then wait for deferred Reply work |
91 | * to complete. | |
92 | */ | |
93 | ib_drain_qp(ia->ri_id->qp); | |
94 | drain_workqueue(buf->rb_completion_wq); | |
f1a03b76 | 95 | |
6d2d0ee2 CL |
96 | /* Deferred Reply processing might have scheduled |
97 | * local invalidations. | |
98 | */ | |
99 | ib_drain_sq(ia->ri_id->qp); | |
f1a03b76 CL |
100 | } |
101 | ||
f9521d53 CL |
102 | /** |
103 | * rpcrdma_qp_event_handler - Handle one QP event (error notification) | |
104 | * @event: details of the event | |
105 | * @context: ep that owns QP where event occurred | |
106 | * | |
107 | * Called from the RDMA provider (device driver) possibly in an interrupt | |
108 | * context. | |
109 | */ | |
c56c65fb | 110 | static void |
f9521d53 | 111 | rpcrdma_qp_event_handler(struct ib_event *event, void *context) |
c56c65fb TT |
112 | { |
113 | struct rpcrdma_ep *ep = context; | |
643cf323 CL |
114 | struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt, |
115 | rx_ep); | |
c56c65fb | 116 | |
f9521d53 | 117 | trace_xprtrdma_qp_event(r_xprt, event); |
c56c65fb TT |
118 | } |
119 | ||
2fa8f88d CL |
120 | /** |
121 | * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC | |
122 | * @cq: completion queue (ignored) | |
123 | * @wc: completed WR | |
124 | * | |
fc664485 CL |
125 | */ |
126 | static void | |
2fa8f88d | 127 | rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) |
fc664485 | 128 | { |
ae72950a CL |
129 | struct ib_cqe *cqe = wc->wr_cqe; |
130 | struct rpcrdma_sendctx *sc = | |
131 | container_of(cqe, struct rpcrdma_sendctx, sc_cqe); | |
132 | ||
2fa8f88d | 133 | /* WARNING: Only wr_cqe and status are reliable at this point */ |
ab03eff5 | 134 | trace_xprtrdma_wc_send(sc, wc); |
2fa8f88d CL |
135 | if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR) |
136 | pr_err("rpcrdma: Send: %s (%u/0x%x)\n", | |
137 | ib_wc_status_msg(wc->status), | |
138 | wc->status, wc->vendor_err); | |
ae72950a CL |
139 | |
140 | rpcrdma_sendctx_put_locked(sc); | |
fc664485 | 141 | } |
c56c65fb | 142 | |
552bf225 | 143 | /** |
1519e969 | 144 | * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC |
552bf225 CL |
145 | * @cq: completion queue (ignored) |
146 | * @wc: completed WR | |
147 | * | |
148 | */ | |
fc664485 | 149 | static void |
1519e969 | 150 | rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) |
fc664485 | 151 | { |
552bf225 CL |
152 | struct ib_cqe *cqe = wc->wr_cqe; |
153 | struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep, | |
154 | rr_cqe); | |
6ceea368 | 155 | struct rpcrdma_xprt *r_xprt = rep->rr_rxprt; |
fc664485 | 156 | |
6ceea368 | 157 | /* WARNING: Only wr_cqe and status are reliable at this point */ |
0e0b854c | 158 | trace_xprtrdma_wc_receive(wc); |
6ceea368 | 159 | --r_xprt->rx_ep.rep_receive_count; |
8502427c | 160 | if (wc->status != IB_WC_SUCCESS) |
6ceea368 | 161 | goto out_flushed; |
fc664485 | 162 | |
8502427c | 163 | /* status == SUCCESS means all fields in wc are trustworthy */ |
96f8778f | 164 | rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len); |
c8b920bb CL |
165 | rep->rr_wc_flags = wc->wc_flags; |
166 | rep->rr_inv_rkey = wc->ex.invalidate_rkey; | |
167 | ||
91a10c52 | 168 | ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf), |
6b1184cd | 169 | rdmab_addr(rep->rr_rdmabuf), |
e2a67190 | 170 | wc->byte_len, DMA_FROM_DEVICE); |
23826c7a | 171 | |
6ceea368 | 172 | rpcrdma_post_recvs(r_xprt, false); |
d8f532d2 | 173 | rpcrdma_reply_handler(rep); |
8502427c | 174 | return; |
fe97b47c | 175 | |
6ceea368 | 176 | out_flushed: |
8502427c | 177 | if (wc->status != IB_WC_WR_FLUSH_ERR) |
552bf225 CL |
178 | pr_err("rpcrdma: Recv: %s (%u/0x%x)\n", |
179 | ib_wc_status_msg(wc->status), | |
180 | wc->status, wc->vendor_err); | |
6ceea368 | 181 | rpcrdma_recv_buffer_put(rep); |
fc664485 CL |
182 | } |
183 | ||
87cfb9a0 CL |
184 | static void |
185 | rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt, | |
186 | struct rdma_conn_param *param) | |
187 | { | |
188 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
189 | const struct rpcrdma_connect_private *pmsg = param->private_data; | |
190 | unsigned int rsize, wsize; | |
191 | ||
c8b920bb | 192 | /* Default settings for RPC-over-RDMA Version One */ |
b5f0afbe | 193 | r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize; |
87cfb9a0 CL |
194 | rsize = RPCRDMA_V1_DEF_INLINE_SIZE; |
195 | wsize = RPCRDMA_V1_DEF_INLINE_SIZE; | |
196 | ||
197 | if (pmsg && | |
198 | pmsg->cp_magic == rpcrdma_cmp_magic && | |
199 | pmsg->cp_version == RPCRDMA_CMP_VERSION) { | |
c95a3c6b | 200 | r_xprt->rx_ia.ri_implicit_roundup = true; |
87cfb9a0 CL |
201 | rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size); |
202 | wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size); | |
203 | } | |
204 | ||
205 | if (rsize < cdata->inline_rsize) | |
206 | cdata->inline_rsize = rsize; | |
207 | if (wsize < cdata->inline_wsize) | |
208 | cdata->inline_wsize = wsize; | |
6d6bf72d CL |
209 | dprintk("RPC: %s: max send %u, max recv %u\n", |
210 | __func__, cdata->inline_wsize, cdata->inline_rsize); | |
87cfb9a0 CL |
211 | rpcrdma_set_max_header_sizes(r_xprt); |
212 | } | |
213 | ||
ae38288e CL |
214 | /** |
215 | * rpcrdma_cm_event_handler - Handle RDMA CM events | |
216 | * @id: rdma_cm_id on which an event has occurred | |
217 | * @event: details of the event | |
218 | * | |
219 | * Called with @id's mutex held. Returns 1 if caller should | |
220 | * destroy @id, otherwise 0. | |
221 | */ | |
c56c65fb | 222 | static int |
ae38288e | 223 | rpcrdma_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event) |
c56c65fb | 224 | { |
ed97f1f7 CL |
225 | struct rpcrdma_xprt *r_xprt = id->context; |
226 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
227 | struct rpcrdma_ep *ep = &r_xprt->rx_ep; | |
228 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
c56c65fb | 229 | |
ae38288e CL |
230 | might_sleep(); |
231 | ||
ed97f1f7 | 232 | trace_xprtrdma_cm_event(r_xprt, event); |
c56c65fb TT |
233 | switch (event->event) { |
234 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
235 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 236 | ia->ri_async_rc = 0; |
c56c65fb | 237 | complete(&ia->ri_done); |
316a616e | 238 | return 0; |
c56c65fb | 239 | case RDMA_CM_EVENT_ADDR_ERROR: |
52d28fe4 | 240 | ia->ri_async_rc = -EPROTO; |
c56c65fb | 241 | complete(&ia->ri_done); |
316a616e | 242 | return 0; |
c56c65fb TT |
243 | case RDMA_CM_EVENT_ROUTE_ERROR: |
244 | ia->ri_async_rc = -ENETUNREACH; | |
c56c65fb | 245 | complete(&ia->ri_done); |
316a616e | 246 | return 0; |
bebd0318 CL |
247 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
248 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) | |
d461f1f2 | 249 | pr_info("rpcrdma: removing device %s for %s:%s\n", |
173b8f49 | 250 | ia->ri_device->name, |
ed97f1f7 | 251 | rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt)); |
bebd0318 CL |
252 | #endif |
253 | set_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags); | |
254 | ep->rep_connected = -ENODEV; | |
ed97f1f7 | 255 | xprt_force_disconnect(xprt); |
bebd0318 CL |
256 | wait_for_completion(&ia->ri_remove_done); |
257 | ||
258 | ia->ri_id = NULL; | |
bebd0318 CL |
259 | ia->ri_device = NULL; |
260 | /* Return 1 to ensure the core destroys the id. */ | |
261 | return 1; | |
c56c65fb | 262 | case RDMA_CM_EVENT_ESTABLISHED: |
ed97f1f7 | 263 | ++xprt->connect_cookie; |
aadc5a94 | 264 | ep->rep_connected = 1; |
ed97f1f7 | 265 | rpcrdma_update_connect_private(r_xprt, &event->param.conn); |
31e62d25 CL |
266 | wake_up_all(&ep->rep_connect_wait); |
267 | break; | |
c56c65fb | 268 | case RDMA_CM_EVENT_CONNECT_ERROR: |
aadc5a94 | 269 | ep->rep_connected = -ENOTCONN; |
31e62d25 | 270 | goto disconnected; |
c56c65fb | 271 | case RDMA_CM_EVENT_UNREACHABLE: |
aadc5a94 | 272 | ep->rep_connected = -ENETUNREACH; |
31e62d25 | 273 | goto disconnected; |
c56c65fb | 274 | case RDMA_CM_EVENT_REJECTED: |
d461f1f2 | 275 | dprintk("rpcrdma: connection to %s:%s rejected: %s\n", |
ed97f1f7 | 276 | rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt), |
0a90487b | 277 | rdma_reject_msg(id, event->status)); |
aadc5a94 | 278 | ep->rep_connected = -ECONNREFUSED; |
0a90487b | 279 | if (event->status == IB_CM_REJ_STALE_CONN) |
aadc5a94 | 280 | ep->rep_connected = -EAGAIN; |
31e62d25 | 281 | goto disconnected; |
c56c65fb | 282 | case RDMA_CM_EVENT_DISCONNECTED: |
aadc5a94 | 283 | ep->rep_connected = -ECONNABORTED; |
31e62d25 CL |
284 | disconnected: |
285 | xprt_force_disconnect(xprt); | |
c56c65fb | 286 | wake_up_all(&ep->rep_connect_wait); |
316a616e | 287 | break; |
c56c65fb | 288 | default: |
c56c65fb TT |
289 | break; |
290 | } | |
291 | ||
5f62412b | 292 | dprintk("RPC: %s: %s:%s on %s/frwr: %s\n", __func__, |
316a616e | 293 | rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt), |
5f62412b | 294 | ia->ri_device->name, rdma_event_msg(event->event)); |
c56c65fb TT |
295 | return 0; |
296 | } | |
297 | ||
298 | static struct rdma_cm_id * | |
dd229cee | 299 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, struct rpcrdma_ia *ia) |
c56c65fb | 300 | { |
109b88ab | 301 | unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1; |
c56c65fb TT |
302 | struct rdma_cm_id *id; |
303 | int rc; | |
304 | ||
b4744e00 CL |
305 | trace_xprtrdma_conn_start(xprt); |
306 | ||
1a954051 | 307 | init_completion(&ia->ri_done); |
bebd0318 | 308 | init_completion(&ia->ri_remove_done); |
1a954051 | 309 | |
ae38288e | 310 | id = rdma_create_id(xprt->rx_xprt.xprt_net, rpcrdma_cm_event_handler, |
107c4beb | 311 | xprt, RDMA_PS_TCP, IB_QPT_RC); |
ddbb347f | 312 | if (IS_ERR(id)) |
c56c65fb | 313 | return id; |
c56c65fb | 314 | |
5675add3 | 315 | ia->ri_async_rc = -ETIMEDOUT; |
dd229cee CL |
316 | rc = rdma_resolve_addr(id, NULL, |
317 | (struct sockaddr *)&xprt->rx_xprt.addr, | |
318 | RDMA_RESOLVE_TIMEOUT); | |
ddbb347f | 319 | if (rc) |
c56c65fb | 320 | goto out; |
109b88ab CL |
321 | rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout); |
322 | if (rc < 0) { | |
b4744e00 | 323 | trace_xprtrdma_conn_tout(xprt); |
109b88ab CL |
324 | goto out; |
325 | } | |
d0f36c46 | 326 | |
c56c65fb TT |
327 | rc = ia->ri_async_rc; |
328 | if (rc) | |
329 | goto out; | |
330 | ||
5675add3 | 331 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb | 332 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
ddbb347f | 333 | if (rc) |
56a6bd15 | 334 | goto out; |
109b88ab CL |
335 | rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout); |
336 | if (rc < 0) { | |
b4744e00 | 337 | trace_xprtrdma_conn_tout(xprt); |
56a6bd15 | 338 | goto out; |
109b88ab | 339 | } |
c56c65fb TT |
340 | rc = ia->ri_async_rc; |
341 | if (rc) | |
56a6bd15 | 342 | goto out; |
c56c65fb TT |
343 | |
344 | return id; | |
56a6bd15 | 345 | |
c56c65fb TT |
346 | out: |
347 | rdma_destroy_id(id); | |
348 | return ERR_PTR(rc); | |
349 | } | |
350 | ||
c56c65fb TT |
351 | /* |
352 | * Exported functions. | |
353 | */ | |
354 | ||
fff09594 CL |
355 | /** |
356 | * rpcrdma_ia_open - Open and initialize an Interface Adapter. | |
dd229cee | 357 | * @xprt: transport with IA to (re)initialize |
fff09594 CL |
358 | * |
359 | * Returns 0 on success, negative errno if an appropriate | |
360 | * Interface Adapter could not be found and opened. | |
c56c65fb TT |
361 | */ |
362 | int | |
dd229cee | 363 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt) |
c56c65fb | 364 | { |
c56c65fb | 365 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
d1ed857e CL |
366 | int rc; |
367 | ||
dd229cee | 368 | ia->ri_id = rpcrdma_create_id(xprt, ia); |
c56c65fb TT |
369 | if (IS_ERR(ia->ri_id)) { |
370 | rc = PTR_ERR(ia->ri_id); | |
fff09594 | 371 | goto out_err; |
c56c65fb | 372 | } |
89e0d112 | 373 | ia->ri_device = ia->ri_id->device; |
c56c65fb | 374 | |
ed082d36 | 375 | ia->ri_pd = ib_alloc_pd(ia->ri_device, 0); |
c56c65fb TT |
376 | if (IS_ERR(ia->ri_pd)) { |
377 | rc = PTR_ERR(ia->ri_pd); | |
b54054ca | 378 | pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc); |
fff09594 | 379 | goto out_err; |
c56c65fb TT |
380 | } |
381 | ||
fff09594 | 382 | switch (xprt_rdma_memreg_strategy) { |
ce5b3717 | 383 | case RPCRDMA_FRWR: |
5f62412b | 384 | if (frwr_is_supported(ia)) |
b54054ca | 385 | break; |
b54054ca | 386 | /*FALLTHROUGH*/ |
bd7ed1d1 | 387 | default: |
fff09594 CL |
388 | pr_err("rpcrdma: Device %s does not support memreg mode %d\n", |
389 | ia->ri_device->name, xprt_rdma_memreg_strategy); | |
b54054ca | 390 | rc = -EINVAL; |
fff09594 | 391 | goto out_err; |
c56c65fb TT |
392 | } |
393 | ||
c56c65fb | 394 | return 0; |
5ae711a2 | 395 | |
fff09594 CL |
396 | out_err: |
397 | rpcrdma_ia_close(ia); | |
c56c65fb TT |
398 | return rc; |
399 | } | |
400 | ||
bebd0318 CL |
401 | /** |
402 | * rpcrdma_ia_remove - Handle device driver unload | |
403 | * @ia: interface adapter being removed | |
404 | * | |
405 | * Divest transport H/W resources associated with this adapter, | |
406 | * but allow it to be restored later. | |
407 | */ | |
408 | void | |
409 | rpcrdma_ia_remove(struct rpcrdma_ia *ia) | |
410 | { | |
411 | struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt, | |
412 | rx_ia); | |
413 | struct rpcrdma_ep *ep = &r_xprt->rx_ep; | |
414 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
415 | struct rpcrdma_req *req; | |
416 | struct rpcrdma_rep *rep; | |
417 | ||
418 | cancel_delayed_work_sync(&buf->rb_refresh_worker); | |
419 | ||
420 | /* This is similar to rpcrdma_ep_destroy, but: | |
421 | * - Don't cancel the connect worker. | |
422 | * - Don't call rpcrdma_ep_disconnect, which waits | |
423 | * for another conn upcall, which will deadlock. | |
424 | * - rdma_disconnect is unneeded, the underlying | |
425 | * connection is already gone. | |
426 | */ | |
427 | if (ia->ri_id->qp) { | |
6d2d0ee2 | 428 | rpcrdma_xprt_drain(r_xprt); |
bebd0318 CL |
429 | rdma_destroy_qp(ia->ri_id); |
430 | ia->ri_id->qp = NULL; | |
431 | } | |
432 | ib_free_cq(ep->rep_attr.recv_cq); | |
25524288 | 433 | ep->rep_attr.recv_cq = NULL; |
bebd0318 | 434 | ib_free_cq(ep->rep_attr.send_cq); |
25524288 | 435 | ep->rep_attr.send_cq = NULL; |
bebd0318 CL |
436 | |
437 | /* The ULP is responsible for ensuring all DMA | |
438 | * mappings and MRs are gone. | |
439 | */ | |
440 | list_for_each_entry(rep, &buf->rb_recv_bufs, rr_list) | |
441 | rpcrdma_dma_unmap_regbuf(rep->rr_rdmabuf); | |
442 | list_for_each_entry(req, &buf->rb_allreqs, rl_all) { | |
443 | rpcrdma_dma_unmap_regbuf(req->rl_rdmabuf); | |
444 | rpcrdma_dma_unmap_regbuf(req->rl_sendbuf); | |
445 | rpcrdma_dma_unmap_regbuf(req->rl_recvbuf); | |
446 | } | |
96ceddea | 447 | rpcrdma_mrs_destroy(buf); |
25524288 CL |
448 | ib_dealloc_pd(ia->ri_pd); |
449 | ia->ri_pd = NULL; | |
bebd0318 CL |
450 | |
451 | /* Allow waiters to continue */ | |
452 | complete(&ia->ri_remove_done); | |
b4744e00 CL |
453 | |
454 | trace_xprtrdma_remove(r_xprt); | |
bebd0318 CL |
455 | } |
456 | ||
fff09594 CL |
457 | /** |
458 | * rpcrdma_ia_close - Clean up/close an IA. | |
459 | * @ia: interface adapter to close | |
460 | * | |
c56c65fb TT |
461 | */ |
462 | void | |
463 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
464 | { | |
fee08caf TT |
465 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
466 | if (ia->ri_id->qp) | |
467 | rdma_destroy_qp(ia->ri_id); | |
56a6bd15 | 468 | rdma_destroy_id(ia->ri_id); |
fee08caf | 469 | } |
fff09594 CL |
470 | ia->ri_id = NULL; |
471 | ia->ri_device = NULL; | |
6d44698d CL |
472 | |
473 | /* If the pd is still busy, xprtrdma missed freeing a resource */ | |
474 | if (ia->ri_pd && !IS_ERR(ia->ri_pd)) | |
7dd78647 | 475 | ib_dealloc_pd(ia->ri_pd); |
fff09594 | 476 | ia->ri_pd = NULL; |
c56c65fb TT |
477 | } |
478 | ||
479 | /* | |
480 | * Create unconnected endpoint. | |
481 | */ | |
482 | int | |
483 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
16f906d6 | 484 | struct rpcrdma_create_data_internal *cdata) |
c56c65fb | 485 | { |
87cfb9a0 | 486 | struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private; |
fc664485 | 487 | struct ib_cq *sendcq, *recvcq; |
914fcad9 | 488 | unsigned int max_sge; |
2fa8f88d | 489 | int rc; |
c56c65fb | 490 | |
33023fb8 | 491 | max_sge = min_t(unsigned int, ia->ri_device->attrs.max_send_sge, |
eed50879 | 492 | RPCRDMA_MAX_SEND_SGES); |
16f906d6 CL |
493 | if (max_sge < RPCRDMA_MIN_SEND_SGES) { |
494 | pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge); | |
b3221d6a CL |
495 | return -ENOMEM; |
496 | } | |
1179e2c2 | 497 | ia->ri_max_send_sges = max_sge; |
b3221d6a | 498 | |
5f62412b | 499 | rc = frwr_open(ia, ep, cdata); |
914fcad9 CL |
500 | if (rc) |
501 | return rc; | |
c56c65fb | 502 | |
f9521d53 | 503 | ep->rep_attr.event_handler = rpcrdma_qp_event_handler; |
c56c65fb | 504 | ep->rep_attr.qp_context = ep; |
c56c65fb | 505 | ep->rep_attr.srq = NULL; |
16f906d6 | 506 | ep->rep_attr.cap.max_send_sge = max_sge; |
c56c65fb TT |
507 | ep->rep_attr.cap.max_recv_sge = 1; |
508 | ep->rep_attr.cap.max_inline_data = 0; | |
509 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
510 | ep->rep_attr.qp_type = IB_QPT_RC; | |
511 | ep->rep_attr.port_num = ~0; | |
512 | ||
513 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " | |
514 | "iovs: send %d recv %d\n", | |
515 | __func__, | |
516 | ep->rep_attr.cap.max_send_wr, | |
517 | ep->rep_attr.cap.max_recv_wr, | |
518 | ep->rep_attr.cap.max_send_sge, | |
519 | ep->rep_attr.cap.max_recv_sge); | |
520 | ||
521 | /* set trigger for requesting send completion */ | |
ae72950a CL |
522 | ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH, |
523 | cdata->max_requests >> 2); | |
524 | ep->rep_send_count = ep->rep_send_batch; | |
c56c65fb | 525 | init_waitqueue_head(&ep->rep_connect_wait); |
6ceea368 | 526 | ep->rep_receive_count = 0; |
c56c65fb | 527 | |
2fa8f88d CL |
528 | sendcq = ib_alloc_cq(ia->ri_device, NULL, |
529 | ep->rep_attr.cap.max_send_wr + 1, | |
a4699f56 | 530 | 1, IB_POLL_WORKQUEUE); |
fc664485 CL |
531 | if (IS_ERR(sendcq)) { |
532 | rc = PTR_ERR(sendcq); | |
c56c65fb TT |
533 | goto out1; |
534 | } | |
535 | ||
552bf225 CL |
536 | recvcq = ib_alloc_cq(ia->ri_device, NULL, |
537 | ep->rep_attr.cap.max_recv_wr + 1, | |
d8f532d2 | 538 | 0, IB_POLL_WORKQUEUE); |
fc664485 CL |
539 | if (IS_ERR(recvcq)) { |
540 | rc = PTR_ERR(recvcq); | |
fc664485 CL |
541 | goto out2; |
542 | } | |
543 | ||
fc664485 CL |
544 | ep->rep_attr.send_cq = sendcq; |
545 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
546 | |
547 | /* Initialize cma parameters */ | |
b2dde94b | 548 | memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma)); |
c56c65fb | 549 | |
87cfb9a0 CL |
550 | /* Prepare RDMA-CM private message */ |
551 | pmsg->cp_magic = rpcrdma_cmp_magic; | |
552 | pmsg->cp_version = RPCRDMA_CMP_VERSION; | |
5f62412b | 553 | pmsg->cp_flags |= RPCRDMA_CMP_F_SND_W_INV_OK; |
87cfb9a0 CL |
554 | pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize); |
555 | pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize); | |
556 | ep->rep_remote_cma.private_data = pmsg; | |
557 | ep->rep_remote_cma.private_data_len = sizeof(*pmsg); | |
c56c65fb TT |
558 | |
559 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 560 | ep->rep_remote_cma.initiator_depth = 0; |
b7e85fff CL |
561 | ep->rep_remote_cma.responder_resources = |
562 | min_t(int, U8_MAX, ia->ri_device->attrs.max_qp_rd_atom); | |
c56c65fb | 563 | |
b2dde94b CL |
564 | /* Limit transport retries so client can detect server |
565 | * GID changes quickly. RPC layer handles re-establishing | |
566 | * transport connection and retransmission. | |
567 | */ | |
568 | ep->rep_remote_cma.retry_count = 6; | |
569 | ||
570 | /* RPC-over-RDMA handles its own flow control. In addition, | |
571 | * make all RNR NAKs visible so we know that RPC-over-RDMA | |
572 | * flow control is working correctly (no NAKs should be seen). | |
573 | */ | |
c56c65fb TT |
574 | ep->rep_remote_cma.flow_control = 0; |
575 | ep->rep_remote_cma.rnr_retry_count = 0; | |
576 | ||
577 | return 0; | |
578 | ||
579 | out2: | |
2fa8f88d | 580 | ib_free_cq(sendcq); |
c56c65fb TT |
581 | out1: |
582 | return rc; | |
583 | } | |
584 | ||
585 | /* | |
586 | * rpcrdma_ep_destroy | |
587 | * | |
588 | * Disconnect and destroy endpoint. After this, the only | |
589 | * valid operations on the ep are to free it (if dynamically | |
590 | * allocated) or re-create it. | |
c56c65fb | 591 | */ |
7f1d5419 | 592 | void |
c56c65fb TT |
593 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
594 | { | |
25524288 | 595 | if (ia->ri_id && ia->ri_id->qp) { |
550d7502 | 596 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
597 | rdma_destroy_qp(ia->ri_id); |
598 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
599 | } |
600 | ||
25524288 CL |
601 | if (ep->rep_attr.recv_cq) |
602 | ib_free_cq(ep->rep_attr.recv_cq); | |
603 | if (ep->rep_attr.send_cq) | |
604 | ib_free_cq(ep->rep_attr.send_cq); | |
c56c65fb TT |
605 | } |
606 | ||
a9b0e381 CL |
607 | /* Re-establish a connection after a device removal event. |
608 | * Unlike a normal reconnection, a fresh PD and a new set | |
609 | * of MRs and buffers is needed. | |
610 | */ | |
611 | static int | |
612 | rpcrdma_ep_recreate_xprt(struct rpcrdma_xprt *r_xprt, | |
613 | struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
614 | { | |
a9b0e381 CL |
615 | int rc, err; |
616 | ||
b4744e00 | 617 | trace_xprtrdma_reinsert(r_xprt); |
a9b0e381 CL |
618 | |
619 | rc = -EHOSTUNREACH; | |
dd229cee | 620 | if (rpcrdma_ia_open(r_xprt)) |
a9b0e381 CL |
621 | goto out1; |
622 | ||
623 | rc = -ENOMEM; | |
624 | err = rpcrdma_ep_create(ep, ia, &r_xprt->rx_data); | |
625 | if (err) { | |
626 | pr_err("rpcrdma: rpcrdma_ep_create returned %d\n", err); | |
627 | goto out2; | |
628 | } | |
629 | ||
630 | rc = -ENETUNREACH; | |
631 | err = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
632 | if (err) { | |
633 | pr_err("rpcrdma: rdma_create_qp returned %d\n", err); | |
634 | goto out3; | |
635 | } | |
636 | ||
96ceddea | 637 | rpcrdma_mrs_create(r_xprt); |
a9b0e381 CL |
638 | return 0; |
639 | ||
640 | out3: | |
641 | rpcrdma_ep_destroy(ep, ia); | |
642 | out2: | |
643 | rpcrdma_ia_close(ia); | |
644 | out1: | |
645 | return rc; | |
646 | } | |
647 | ||
1890896b CL |
648 | static int |
649 | rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep, | |
650 | struct rpcrdma_ia *ia) | |
651 | { | |
1890896b CL |
652 | struct rdma_cm_id *id, *old; |
653 | int err, rc; | |
654 | ||
b4744e00 | 655 | trace_xprtrdma_reconnect(r_xprt); |
1890896b CL |
656 | |
657 | rpcrdma_ep_disconnect(ep, ia); | |
658 | ||
659 | rc = -EHOSTUNREACH; | |
dd229cee | 660 | id = rpcrdma_create_id(r_xprt, ia); |
1890896b CL |
661 | if (IS_ERR(id)) |
662 | goto out; | |
663 | ||
664 | /* As long as the new ID points to the same device as the | |
665 | * old ID, we can reuse the transport's existing PD and all | |
666 | * previously allocated MRs. Also, the same device means | |
667 | * the transport's previous DMA mappings are still valid. | |
668 | * | |
669 | * This is a sanity check only. There should be no way these | |
670 | * point to two different devices here. | |
671 | */ | |
672 | old = id; | |
673 | rc = -ENETUNREACH; | |
674 | if (ia->ri_device != id->device) { | |
675 | pr_err("rpcrdma: can't reconnect on different device!\n"); | |
676 | goto out_destroy; | |
677 | } | |
678 | ||
679 | err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); | |
ddbb347f | 680 | if (err) |
1890896b | 681 | goto out_destroy; |
1890896b CL |
682 | |
683 | /* Atomically replace the transport's ID and QP. */ | |
684 | rc = 0; | |
685 | old = ia->ri_id; | |
686 | ia->ri_id = id; | |
687 | rdma_destroy_qp(old); | |
688 | ||
689 | out_destroy: | |
56a6bd15 | 690 | rdma_destroy_id(old); |
1890896b CL |
691 | out: |
692 | return rc; | |
693 | } | |
694 | ||
c56c65fb TT |
695 | /* |
696 | * Connect unconnected endpoint. | |
697 | */ | |
698 | int | |
699 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
700 | { | |
0a90487b CL |
701 | struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt, |
702 | rx_ia); | |
31e62d25 | 703 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; |
1890896b | 704 | int rc; |
c56c65fb | 705 | |
c56c65fb | 706 | retry: |
1890896b CL |
707 | switch (ep->rep_connected) { |
708 | case 0: | |
ec62f40d CL |
709 | dprintk("RPC: %s: connecting...\n", __func__); |
710 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
711 | if (rc) { | |
1890896b CL |
712 | rc = -ENETUNREACH; |
713 | goto out_noupdate; | |
ec62f40d | 714 | } |
1890896b | 715 | break; |
a9b0e381 CL |
716 | case -ENODEV: |
717 | rc = rpcrdma_ep_recreate_xprt(r_xprt, ep, ia); | |
718 | if (rc) | |
719 | goto out_noupdate; | |
720 | break; | |
1890896b CL |
721 | default: |
722 | rc = rpcrdma_ep_reconnect(r_xprt, ep, ia); | |
723 | if (rc) | |
724 | goto out; | |
c56c65fb TT |
725 | } |
726 | ||
c56c65fb | 727 | ep->rep_connected = 0; |
31e62d25 CL |
728 | xprt_clear_connected(xprt); |
729 | ||
8d4fb8ff | 730 | rpcrdma_post_recvs(r_xprt, true); |
c56c65fb TT |
731 | |
732 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
ddbb347f | 733 | if (rc) |
c56c65fb | 734 | goto out; |
c56c65fb | 735 | |
c56c65fb | 736 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
c56c65fb | 737 | if (ep->rep_connected <= 0) { |
0a90487b | 738 | if (ep->rep_connected == -EAGAIN) |
c56c65fb TT |
739 | goto retry; |
740 | rc = ep->rep_connected; | |
0a90487b | 741 | goto out; |
c56c65fb TT |
742 | } |
743 | ||
0a90487b | 744 | dprintk("RPC: %s: connected\n", __func__); |
7c8d9e7c | 745 | |
c56c65fb TT |
746 | out: |
747 | if (rc) | |
748 | ep->rep_connected = rc; | |
1890896b CL |
749 | |
750 | out_noupdate: | |
c56c65fb TT |
751 | return rc; |
752 | } | |
753 | ||
6d2d0ee2 CL |
754 | /** |
755 | * rpcrdma_ep_disconnect - Disconnect underlying transport | |
756 | * @ep: endpoint to disconnect | |
757 | * @ia: associated interface adapter | |
c56c65fb TT |
758 | * |
759 | * This is separate from destroy to facilitate the ability | |
760 | * to reconnect without recreating the endpoint. | |
761 | * | |
762 | * This call is not reentrant, and must not be made in parallel | |
763 | * on the same endpoint. | |
764 | */ | |
282191cb | 765 | void |
c56c65fb TT |
766 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
767 | { | |
6d2d0ee2 CL |
768 | struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt, |
769 | rx_ep); | |
c56c65fb TT |
770 | int rc; |
771 | ||
6d2d0ee2 | 772 | /* returns without wait if ID is not connected */ |
c56c65fb | 773 | rc = rdma_disconnect(ia->ri_id); |
b4744e00 | 774 | if (!rc) |
c56c65fb TT |
775 | wait_event_interruptible(ep->rep_connect_wait, |
776 | ep->rep_connected != 1); | |
b4744e00 | 777 | else |
c56c65fb | 778 | ep->rep_connected = rc; |
6d2d0ee2 | 779 | trace_xprtrdma_disconnect(r_xprt, rc); |
550d7502 | 780 | |
6d2d0ee2 | 781 | rpcrdma_xprt_drain(r_xprt); |
c56c65fb TT |
782 | } |
783 | ||
ae72950a CL |
784 | /* Fixed-size circular FIFO queue. This implementation is wait-free and |
785 | * lock-free. | |
786 | * | |
787 | * Consumer is the code path that posts Sends. This path dequeues a | |
788 | * sendctx for use by a Send operation. Multiple consumer threads | |
789 | * are serialized by the RPC transport lock, which allows only one | |
790 | * ->send_request call at a time. | |
791 | * | |
792 | * Producer is the code path that handles Send completions. This path | |
793 | * enqueues a sendctx that has been completed. Multiple producer | |
794 | * threads are serialized by the ib_poll_cq() function. | |
795 | */ | |
796 | ||
797 | /* rpcrdma_sendctxs_destroy() assumes caller has already quiesced | |
798 | * queue activity, and ib_drain_qp has flushed all remaining Send | |
799 | * requests. | |
800 | */ | |
801 | static void rpcrdma_sendctxs_destroy(struct rpcrdma_buffer *buf) | |
802 | { | |
803 | unsigned long i; | |
804 | ||
805 | for (i = 0; i <= buf->rb_sc_last; i++) | |
806 | kfree(buf->rb_sc_ctxs[i]); | |
807 | kfree(buf->rb_sc_ctxs); | |
808 | } | |
809 | ||
810 | static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ia *ia) | |
811 | { | |
812 | struct rpcrdma_sendctx *sc; | |
813 | ||
814 | sc = kzalloc(sizeof(*sc) + | |
815 | ia->ri_max_send_sges * sizeof(struct ib_sge), | |
816 | GFP_KERNEL); | |
817 | if (!sc) | |
818 | return NULL; | |
819 | ||
820 | sc->sc_wr.wr_cqe = &sc->sc_cqe; | |
821 | sc->sc_wr.sg_list = sc->sc_sges; | |
822 | sc->sc_wr.opcode = IB_WR_SEND; | |
823 | sc->sc_cqe.done = rpcrdma_wc_send; | |
824 | return sc; | |
825 | } | |
826 | ||
827 | static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt) | |
828 | { | |
829 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
830 | struct rpcrdma_sendctx *sc; | |
831 | unsigned long i; | |
832 | ||
833 | /* Maximum number of concurrent outstanding Send WRs. Capping | |
834 | * the circular queue size stops Send Queue overflow by causing | |
835 | * the ->send_request call to fail temporarily before too many | |
836 | * Sends are posted. | |
837 | */ | |
838 | i = buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS; | |
839 | dprintk("RPC: %s: allocating %lu send_ctxs\n", __func__, i); | |
840 | buf->rb_sc_ctxs = kcalloc(i, sizeof(sc), GFP_KERNEL); | |
841 | if (!buf->rb_sc_ctxs) | |
842 | return -ENOMEM; | |
843 | ||
844 | buf->rb_sc_last = i - 1; | |
845 | for (i = 0; i <= buf->rb_sc_last; i++) { | |
846 | sc = rpcrdma_sendctx_create(&r_xprt->rx_ia); | |
847 | if (!sc) | |
6e17f58c | 848 | return -ENOMEM; |
ae72950a CL |
849 | |
850 | sc->sc_xprt = r_xprt; | |
851 | buf->rb_sc_ctxs[i] = sc; | |
852 | } | |
853 | ||
854 | return 0; | |
ae72950a CL |
855 | } |
856 | ||
857 | /* The sendctx queue is not guaranteed to have a size that is a | |
858 | * power of two, thus the helpers in circ_buf.h cannot be used. | |
859 | * The other option is to use modulus (%), which can be expensive. | |
860 | */ | |
861 | static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf, | |
862 | unsigned long item) | |
863 | { | |
864 | return likely(item < buf->rb_sc_last) ? item + 1 : 0; | |
865 | } | |
866 | ||
867 | /** | |
868 | * rpcrdma_sendctx_get_locked - Acquire a send context | |
869 | * @buf: transport buffers from which to acquire an unused context | |
870 | * | |
871 | * Returns pointer to a free send completion context; or NULL if | |
872 | * the queue is empty. | |
873 | * | |
874 | * Usage: Called to acquire an SGE array before preparing a Send WR. | |
875 | * | |
876 | * The caller serializes calls to this function (per rpcrdma_buffer), | |
877 | * and provides an effective memory barrier that flushes the new value | |
878 | * of rb_sc_head. | |
879 | */ | |
880 | struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf) | |
881 | { | |
882 | struct rpcrdma_xprt *r_xprt; | |
883 | struct rpcrdma_sendctx *sc; | |
884 | unsigned long next_head; | |
885 | ||
886 | next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head); | |
887 | ||
888 | if (next_head == READ_ONCE(buf->rb_sc_tail)) | |
889 | goto out_emptyq; | |
890 | ||
891 | /* ORDER: item must be accessed _before_ head is updated */ | |
892 | sc = buf->rb_sc_ctxs[next_head]; | |
893 | ||
894 | /* Releasing the lock in the caller acts as a memory | |
895 | * barrier that flushes rb_sc_head. | |
896 | */ | |
897 | buf->rb_sc_head = next_head; | |
898 | ||
899 | return sc; | |
900 | ||
901 | out_emptyq: | |
902 | /* The queue is "empty" if there have not been enough Send | |
903 | * completions recently. This is a sign the Send Queue is | |
904 | * backing up. Cause the caller to pause and try again. | |
905 | */ | |
2fad6592 | 906 | set_bit(RPCRDMA_BUF_F_EMPTY_SCQ, &buf->rb_flags); |
ae72950a CL |
907 | r_xprt = container_of(buf, struct rpcrdma_xprt, rx_buf); |
908 | r_xprt->rx_stats.empty_sendctx_q++; | |
909 | return NULL; | |
910 | } | |
911 | ||
912 | /** | |
913 | * rpcrdma_sendctx_put_locked - Release a send context | |
914 | * @sc: send context to release | |
915 | * | |
916 | * Usage: Called from Send completion to return a sendctxt | |
917 | * to the queue. | |
918 | * | |
919 | * The caller serializes calls to this function (per rpcrdma_buffer). | |
920 | */ | |
efd81e90 CL |
921 | static void |
922 | rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc) | |
ae72950a CL |
923 | { |
924 | struct rpcrdma_buffer *buf = &sc->sc_xprt->rx_buf; | |
925 | unsigned long next_tail; | |
926 | ||
927 | /* Unmap SGEs of previously completed by unsignaled | |
928 | * Sends by walking up the queue until @sc is found. | |
929 | */ | |
930 | next_tail = buf->rb_sc_tail; | |
931 | do { | |
932 | next_tail = rpcrdma_sendctx_next(buf, next_tail); | |
933 | ||
934 | /* ORDER: item must be accessed _before_ tail is updated */ | |
935 | rpcrdma_unmap_sendctx(buf->rb_sc_ctxs[next_tail]); | |
936 | ||
937 | } while (buf->rb_sc_ctxs[next_tail] != sc); | |
938 | ||
939 | /* Paired with READ_ONCE */ | |
940 | smp_store_release(&buf->rb_sc_tail, next_tail); | |
2fad6592 CL |
941 | |
942 | if (test_and_clear_bit(RPCRDMA_BUF_F_EMPTY_SCQ, &buf->rb_flags)) { | |
943 | smp_mb__after_atomic(); | |
944 | xprt_write_space(&sc->sc_xprt->rx_xprt); | |
945 | } | |
ae72950a CL |
946 | } |
947 | ||
e2ac236c | 948 | static void |
96ceddea | 949 | rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt) |
e2ac236c CL |
950 | { |
951 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
952 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
953 | unsigned int count; | |
954 | LIST_HEAD(free); | |
955 | LIST_HEAD(all); | |
956 | ||
c421ece6 | 957 | for (count = 0; count < ia->ri_max_segs; count++) { |
96ceddea | 958 | struct rpcrdma_mr *mr; |
e2ac236c CL |
959 | int rc; |
960 | ||
96ceddea CL |
961 | mr = kzalloc(sizeof(*mr), GFP_KERNEL); |
962 | if (!mr) | |
e2ac236c CL |
963 | break; |
964 | ||
5f62412b | 965 | rc = frwr_init_mr(ia, mr); |
e2ac236c | 966 | if (rc) { |
96ceddea | 967 | kfree(mr); |
e2ac236c CL |
968 | break; |
969 | } | |
970 | ||
96ceddea | 971 | mr->mr_xprt = r_xprt; |
e2ac236c | 972 | |
96ceddea CL |
973 | list_add(&mr->mr_list, &free); |
974 | list_add(&mr->mr_all, &all); | |
e2ac236c CL |
975 | } |
976 | ||
96ceddea CL |
977 | spin_lock(&buf->rb_mrlock); |
978 | list_splice(&free, &buf->rb_mrs); | |
e2ac236c CL |
979 | list_splice(&all, &buf->rb_all); |
980 | r_xprt->rx_stats.mrs_allocated += count; | |
96ceddea | 981 | spin_unlock(&buf->rb_mrlock); |
1c443eff | 982 | trace_xprtrdma_createmrs(r_xprt, count); |
9e679d5e CL |
983 | |
984 | xprt_write_space(&r_xprt->rx_xprt); | |
e2ac236c CL |
985 | } |
986 | ||
987 | static void | |
988 | rpcrdma_mr_refresh_worker(struct work_struct *work) | |
989 | { | |
990 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, | |
991 | rb_refresh_worker.work); | |
992 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, | |
993 | rx_buf); | |
994 | ||
96ceddea | 995 | rpcrdma_mrs_create(r_xprt); |
e2ac236c CL |
996 | } |
997 | ||
f531a5db | 998 | struct rpcrdma_req * |
1392402c CL |
999 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) |
1000 | { | |
f531a5db | 1001 | struct rpcrdma_buffer *buffer = &r_xprt->rx_buf; |
2dd4a012 | 1002 | struct rpcrdma_regbuf *rb; |
1392402c | 1003 | struct rpcrdma_req *req; |
1392402c | 1004 | |
85275c87 | 1005 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 1006 | if (req == NULL) |
85275c87 | 1007 | return ERR_PTR(-ENOMEM); |
1392402c | 1008 | |
2dd4a012 CL |
1009 | rb = rpcrdma_alloc_regbuf(RPCRDMA_HDRBUF_SIZE, |
1010 | DMA_TO_DEVICE, GFP_KERNEL); | |
1011 | if (IS_ERR(rb)) { | |
1012 | kfree(req); | |
1013 | return ERR_PTR(-ENOMEM); | |
1014 | } | |
1015 | req->rl_rdmabuf = rb; | |
1016 | xdr_buf_init(&req->rl_hdrbuf, rb->rg_base, rdmab_length(rb)); | |
1017 | req->rl_buffer = buffer; | |
1018 | INIT_LIST_HEAD(&req->rl_registered); | |
1019 | ||
92f4433e | 1020 | spin_lock(&buffer->rb_lock); |
f531a5db | 1021 | list_add(&req->rl_all, &buffer->rb_allreqs); |
92f4433e | 1022 | spin_unlock(&buffer->rb_lock); |
1392402c | 1023 | return req; |
1392402c CL |
1024 | } |
1025 | ||
7c8d9e7c CL |
1026 | static int |
1027 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt, bool temp) | |
1392402c CL |
1028 | { |
1029 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
d698c4a0 | 1030 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
1392402c CL |
1031 | struct rpcrdma_rep *rep; |
1032 | int rc; | |
1033 | ||
1034 | rc = -ENOMEM; | |
6b1184cd | 1035 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
1036 | if (rep == NULL) |
1037 | goto out; | |
1392402c | 1038 | |
13650c23 | 1039 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize, |
99ef4db3 | 1040 | DMA_FROM_DEVICE, GFP_KERNEL); |
6b1184cd CL |
1041 | if (IS_ERR(rep->rr_rdmabuf)) { |
1042 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 1043 | goto out_free; |
6b1184cd | 1044 | } |
96f8778f CL |
1045 | xdr_buf_init(&rep->rr_hdrbuf, rep->rr_rdmabuf->rg_base, |
1046 | rdmab_length(rep->rr_rdmabuf)); | |
1392402c | 1047 | |
1519e969 | 1048 | rep->rr_cqe.done = rpcrdma_wc_receive; |
fed171b3 | 1049 | rep->rr_rxprt = r_xprt; |
d8f532d2 | 1050 | INIT_WORK(&rep->rr_work, rpcrdma_deferred_completion); |
6ea8e711 CL |
1051 | rep->rr_recv_wr.next = NULL; |
1052 | rep->rr_recv_wr.wr_cqe = &rep->rr_cqe; | |
1053 | rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; | |
1054 | rep->rr_recv_wr.num_sge = 1; | |
7c8d9e7c | 1055 | rep->rr_temp = temp; |
d698c4a0 CL |
1056 | |
1057 | spin_lock(&buf->rb_lock); | |
1058 | list_add(&rep->rr_list, &buf->rb_recv_bufs); | |
1059 | spin_unlock(&buf->rb_lock); | |
1060 | return 0; | |
1392402c CL |
1061 | |
1062 | out_free: | |
1063 | kfree(rep); | |
1064 | out: | |
d698c4a0 | 1065 | return rc; |
1392402c CL |
1066 | } |
1067 | ||
c56c65fb | 1068 | int |
ac920d04 | 1069 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 1070 | { |
ac920d04 | 1071 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
c56c65fb TT |
1072 | int i, rc; |
1073 | ||
512ccfb6 | 1074 | buf->rb_flags = 0; |
1e465fd4 | 1075 | buf->rb_max_requests = r_xprt->rx_data.max_requests; |
f531a5db | 1076 | buf->rb_bc_srv_max_requests = 0; |
96ceddea | 1077 | spin_lock_init(&buf->rb_mrlock); |
505bbe64 | 1078 | spin_lock_init(&buf->rb_lock); |
96ceddea | 1079 | INIT_LIST_HEAD(&buf->rb_mrs); |
e2ac236c | 1080 | INIT_LIST_HEAD(&buf->rb_all); |
e2ac236c CL |
1081 | INIT_DELAYED_WORK(&buf->rb_refresh_worker, |
1082 | rpcrdma_mr_refresh_worker); | |
c56c65fb | 1083 | |
96ceddea | 1084 | rpcrdma_mrs_create(r_xprt); |
c56c65fb | 1085 | |
1e465fd4 | 1086 | INIT_LIST_HEAD(&buf->rb_send_bufs); |
f531a5db | 1087 | INIT_LIST_HEAD(&buf->rb_allreqs); |
c56c65fb TT |
1088 | for (i = 0; i < buf->rb_max_requests; i++) { |
1089 | struct rpcrdma_req *req; | |
c56c65fb | 1090 | |
1392402c CL |
1091 | req = rpcrdma_create_req(r_xprt); |
1092 | if (IS_ERR(req)) { | |
c56c65fb TT |
1093 | dprintk("RPC: %s: request buffer %d alloc" |
1094 | " failed\n", __func__, i); | |
1392402c | 1095 | rc = PTR_ERR(req); |
c56c65fb TT |
1096 | goto out; |
1097 | } | |
a80d66c9 | 1098 | list_add(&req->rl_list, &buf->rb_send_bufs); |
1e465fd4 CL |
1099 | } |
1100 | ||
8d4fb8ff | 1101 | buf->rb_credits = 1; |
1e465fd4 | 1102 | INIT_LIST_HEAD(&buf->rb_recv_bufs); |
1392402c | 1103 | |
ae72950a CL |
1104 | rc = rpcrdma_sendctxs_create(r_xprt); |
1105 | if (rc) | |
1106 | goto out; | |
1107 | ||
6d2d0ee2 CL |
1108 | buf->rb_completion_wq = alloc_workqueue("rpcrdma-%s", |
1109 | WQ_MEM_RECLAIM | WQ_HIGHPRI, | |
1110 | 0, | |
1111 | r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]); | |
4429b668 DC |
1112 | if (!buf->rb_completion_wq) { |
1113 | rc = -ENOMEM; | |
6d2d0ee2 | 1114 | goto out; |
4429b668 | 1115 | } |
6d2d0ee2 | 1116 | |
c56c65fb TT |
1117 | return 0; |
1118 | out: | |
1119 | rpcrdma_buffer_destroy(buf); | |
1120 | return rc; | |
1121 | } | |
1122 | ||
1392402c | 1123 | static void |
13650c23 | 1124 | rpcrdma_destroy_rep(struct rpcrdma_rep *rep) |
1392402c | 1125 | { |
13650c23 | 1126 | rpcrdma_free_regbuf(rep->rr_rdmabuf); |
1392402c CL |
1127 | kfree(rep); |
1128 | } | |
1129 | ||
92f4433e CL |
1130 | /** |
1131 | * rpcrdma_req_destroy - Destroy an rpcrdma_req object | |
1132 | * @req: unused object to be destroyed | |
1133 | * | |
1134 | * This function assumes that the caller prevents concurrent device | |
1135 | * unload and transport tear-down. | |
1136 | */ | |
f531a5db | 1137 | void |
92f4433e | 1138 | rpcrdma_req_destroy(struct rpcrdma_req *req) |
1392402c | 1139 | { |
92f4433e CL |
1140 | list_del(&req->rl_all); |
1141 | ||
13650c23 CL |
1142 | rpcrdma_free_regbuf(req->rl_recvbuf); |
1143 | rpcrdma_free_regbuf(req->rl_sendbuf); | |
1144 | rpcrdma_free_regbuf(req->rl_rdmabuf); | |
1392402c CL |
1145 | kfree(req); |
1146 | } | |
1147 | ||
e2ac236c | 1148 | static void |
96ceddea | 1149 | rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf) |
e2ac236c CL |
1150 | { |
1151 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, | |
1152 | rx_buf); | |
96ceddea | 1153 | struct rpcrdma_mr *mr; |
e2ac236c CL |
1154 | unsigned int count; |
1155 | ||
1156 | count = 0; | |
96ceddea | 1157 | spin_lock(&buf->rb_mrlock); |
e2ac236c | 1158 | while (!list_empty(&buf->rb_all)) { |
96ceddea CL |
1159 | mr = list_entry(buf->rb_all.next, struct rpcrdma_mr, mr_all); |
1160 | list_del(&mr->mr_all); | |
e2ac236c | 1161 | |
96ceddea | 1162 | spin_unlock(&buf->rb_mrlock); |
054f1557 CL |
1163 | |
1164 | /* Ensure MW is not on any rl_registered list */ | |
1165 | if (!list_empty(&mr->mr_list)) | |
1166 | list_del(&mr->mr_list); | |
1167 | ||
5f62412b | 1168 | frwr_release_mr(mr); |
e2ac236c | 1169 | count++; |
96ceddea | 1170 | spin_lock(&buf->rb_mrlock); |
e2ac236c | 1171 | } |
96ceddea | 1172 | spin_unlock(&buf->rb_mrlock); |
e2ac236c CL |
1173 | r_xprt->rx_stats.mrs_allocated = 0; |
1174 | ||
1175 | dprintk("RPC: %s: released %u MRs\n", __func__, count); | |
1176 | } | |
1177 | ||
af65ed40 CL |
1178 | /** |
1179 | * rpcrdma_buffer_destroy - Release all hw resources | |
1180 | * @buf: root control block for resources | |
1181 | * | |
1182 | * ORDERING: relies on a prior ib_drain_qp : | |
1183 | * - No more Send or Receive completions can occur | |
1184 | * - All MRs, reps, and reqs are returned to their free lists | |
1185 | */ | |
c56c65fb TT |
1186 | void |
1187 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1188 | { | |
9378b274 | 1189 | cancel_delayed_work_sync(&buf->rb_refresh_worker); |
505bbe64 | 1190 | |
6d2d0ee2 CL |
1191 | if (buf->rb_completion_wq) { |
1192 | destroy_workqueue(buf->rb_completion_wq); | |
1193 | buf->rb_completion_wq = NULL; | |
1194 | } | |
1195 | ||
ae72950a CL |
1196 | rpcrdma_sendctxs_destroy(buf); |
1197 | ||
1e465fd4 CL |
1198 | while (!list_empty(&buf->rb_recv_bufs)) { |
1199 | struct rpcrdma_rep *rep; | |
c56c65fb | 1200 | |
9d95cd53 CL |
1201 | rep = list_first_entry(&buf->rb_recv_bufs, |
1202 | struct rpcrdma_rep, rr_list); | |
1203 | list_del(&rep->rr_list); | |
13650c23 | 1204 | rpcrdma_destroy_rep(rep); |
c56c65fb TT |
1205 | } |
1206 | ||
92f4433e | 1207 | while (!list_empty(&buf->rb_send_bufs)) { |
1e465fd4 | 1208 | struct rpcrdma_req *req; |
4034ba04 | 1209 | |
92f4433e CL |
1210 | req = list_first_entry(&buf->rb_send_bufs, |
1211 | struct rpcrdma_req, rl_list); | |
1212 | list_del(&req->rl_list); | |
1213 | rpcrdma_req_destroy(req); | |
1e465fd4 | 1214 | } |
4034ba04 | 1215 | |
96ceddea | 1216 | rpcrdma_mrs_destroy(buf); |
c56c65fb TT |
1217 | } |
1218 | ||
96ceddea CL |
1219 | /** |
1220 | * rpcrdma_mr_get - Allocate an rpcrdma_mr object | |
1221 | * @r_xprt: controlling transport | |
1222 | * | |
1223 | * Returns an initialized rpcrdma_mr or NULL if no free | |
1224 | * rpcrdma_mr objects are available. | |
1225 | */ | |
1226 | struct rpcrdma_mr * | |
1227 | rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt) | |
c2922c02 | 1228 | { |
346aa66b | 1229 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
96ceddea | 1230 | struct rpcrdma_mr *mr = NULL; |
346aa66b | 1231 | |
96ceddea CL |
1232 | spin_lock(&buf->rb_mrlock); |
1233 | if (!list_empty(&buf->rb_mrs)) | |
1234 | mr = rpcrdma_mr_pop(&buf->rb_mrs); | |
1235 | spin_unlock(&buf->rb_mrlock); | |
346aa66b | 1236 | |
96ceddea CL |
1237 | if (!mr) |
1238 | goto out_nomrs; | |
1239 | return mr; | |
e2ac236c | 1240 | |
96ceddea | 1241 | out_nomrs: |
1c443eff | 1242 | trace_xprtrdma_nomrs(r_xprt); |
bebd0318 CL |
1243 | if (r_xprt->rx_ep.rep_connected != -ENODEV) |
1244 | schedule_delayed_work(&buf->rb_refresh_worker, 0); | |
e2ac236c CL |
1245 | |
1246 | /* Allow the reply handler and refresh worker to run */ | |
1247 | cond_resched(); | |
1248 | ||
1249 | return NULL; | |
c2922c02 CL |
1250 | } |
1251 | ||
ec12e479 CL |
1252 | static void |
1253 | __rpcrdma_mr_put(struct rpcrdma_buffer *buf, struct rpcrdma_mr *mr) | |
1254 | { | |
1255 | spin_lock(&buf->rb_mrlock); | |
1256 | rpcrdma_mr_push(mr, &buf->rb_mrs); | |
1257 | spin_unlock(&buf->rb_mrlock); | |
1258 | } | |
1259 | ||
96ceddea CL |
1260 | /** |
1261 | * rpcrdma_mr_put - Release an rpcrdma_mr object | |
1262 | * @mr: object to release | |
1263 | * | |
1264 | */ | |
346aa66b | 1265 | void |
96ceddea | 1266 | rpcrdma_mr_put(struct rpcrdma_mr *mr) |
ec12e479 CL |
1267 | { |
1268 | __rpcrdma_mr_put(&mr->mr_xprt->rx_buf, mr); | |
1269 | } | |
1270 | ||
1271 | /** | |
1272 | * rpcrdma_mr_unmap_and_put - DMA unmap an MR and release it | |
1273 | * @mr: object to release | |
1274 | * | |
1275 | */ | |
1276 | void | |
1277 | rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr) | |
c2922c02 | 1278 | { |
96ceddea | 1279 | struct rpcrdma_xprt *r_xprt = mr->mr_xprt; |
c2922c02 | 1280 | |
e2f34e26 CL |
1281 | if (mr->mr_dir != DMA_NONE) { |
1282 | trace_xprtrdma_mr_unmap(mr); | |
1283 | ib_dma_unmap_sg(r_xprt->rx_ia.ri_device, | |
1284 | mr->mr_sg, mr->mr_nents, mr->mr_dir); | |
1285 | mr->mr_dir = DMA_NONE; | |
1286 | } | |
ec12e479 | 1287 | __rpcrdma_mr_put(&r_xprt->rx_buf, mr); |
c2922c02 CL |
1288 | } |
1289 | ||
7c8d9e7c CL |
1290 | /** |
1291 | * rpcrdma_buffer_get - Get a request buffer | |
1292 | * @buffers: Buffer pool from which to obtain a buffer | |
78d506e1 | 1293 | * |
7c8d9e7c | 1294 | * Returns a fresh rpcrdma_req, or NULL if none are available. |
c56c65fb TT |
1295 | */ |
1296 | struct rpcrdma_req * | |
1297 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1298 | { | |
1299 | struct rpcrdma_req *req; | |
c14d86e5 | 1300 | |
a5b027e1 | 1301 | spin_lock(&buffers->rb_lock); |
e68699cc CL |
1302 | req = list_first_entry_or_null(&buffers->rb_send_bufs, |
1303 | struct rpcrdma_req, rl_list); | |
1304 | if (req) | |
1305 | list_del_init(&req->rl_list); | |
a5b027e1 | 1306 | spin_unlock(&buffers->rb_lock); |
1e465fd4 | 1307 | return req; |
c56c65fb TT |
1308 | } |
1309 | ||
7c8d9e7c CL |
1310 | /** |
1311 | * rpcrdma_buffer_put - Put request/reply buffers back into pool | |
1312 | * @req: object to return | |
1313 | * | |
c56c65fb TT |
1314 | */ |
1315 | void | |
1316 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1317 | { | |
1318 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1e465fd4 | 1319 | struct rpcrdma_rep *rep = req->rl_reply; |
c56c65fb | 1320 | |
1e465fd4 CL |
1321 | req->rl_reply = NULL; |
1322 | ||
a5b027e1 | 1323 | spin_lock(&buffers->rb_lock); |
7c8d9e7c | 1324 | list_add(&req->rl_list, &buffers->rb_send_bufs); |
05c97466 | 1325 | if (rep) { |
7c8d9e7c CL |
1326 | if (!rep->rr_temp) { |
1327 | list_add(&rep->rr_list, &buffers->rb_recv_bufs); | |
1328 | rep = NULL; | |
1329 | } | |
05c97466 | 1330 | } |
a5b027e1 | 1331 | spin_unlock(&buffers->rb_lock); |
7c8d9e7c CL |
1332 | if (rep) |
1333 | rpcrdma_destroy_rep(rep); | |
c56c65fb TT |
1334 | } |
1335 | ||
1336 | /* | |
1337 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1338 | * request. This happens in error conditions. |
c56c65fb TT |
1339 | */ |
1340 | void | |
1341 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1342 | { | |
fed171b3 | 1343 | struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf; |
c56c65fb | 1344 | |
7c8d9e7c CL |
1345 | if (!rep->rr_temp) { |
1346 | spin_lock(&buffers->rb_lock); | |
1347 | list_add(&rep->rr_list, &buffers->rb_recv_bufs); | |
1348 | spin_unlock(&buffers->rb_lock); | |
1349 | } else { | |
1350 | rpcrdma_destroy_rep(rep); | |
1351 | } | |
c56c65fb TT |
1352 | } |
1353 | ||
9128c3e7 | 1354 | /** |
99ef4db3 | 1355 | * rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers |
9128c3e7 | 1356 | * @size: size of buffer to be allocated, in bytes |
99ef4db3 | 1357 | * @direction: direction of data movement |
9128c3e7 CL |
1358 | * @flags: GFP flags |
1359 | * | |
54cbd6b0 CL |
1360 | * Returns an ERR_PTR, or a pointer to a regbuf, a buffer that |
1361 | * can be persistently DMA-mapped for I/O. | |
9128c3e7 CL |
1362 | * |
1363 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
99ef4db3 | 1364 | * receiving the payload of RDMA RECV operations. During Long Calls |
5f62412b | 1365 | * or Replies they may be registered externally via frwr_map. |
9128c3e7 CL |
1366 | */ |
1367 | struct rpcrdma_regbuf * | |
13650c23 CL |
1368 | rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction, |
1369 | gfp_t flags) | |
9128c3e7 CL |
1370 | { |
1371 | struct rpcrdma_regbuf *rb; | |
9128c3e7 | 1372 | |
9128c3e7 CL |
1373 | rb = kmalloc(sizeof(*rb) + size, flags); |
1374 | if (rb == NULL) | |
54cbd6b0 | 1375 | return ERR_PTR(-ENOMEM); |
9128c3e7 | 1376 | |
54cbd6b0 | 1377 | rb->rg_device = NULL; |
99ef4db3 | 1378 | rb->rg_direction = direction; |
54cbd6b0 | 1379 | rb->rg_iov.length = size; |
9128c3e7 CL |
1380 | |
1381 | return rb; | |
54cbd6b0 | 1382 | } |
9128c3e7 | 1383 | |
54cbd6b0 CL |
1384 | /** |
1385 | * __rpcrdma_map_regbuf - DMA-map a regbuf | |
1386 | * @ia: controlling rpcrdma_ia | |
1387 | * @rb: regbuf to be mapped | |
1388 | */ | |
1389 | bool | |
1390 | __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1391 | { | |
91a10c52 CL |
1392 | struct ib_device *device = ia->ri_device; |
1393 | ||
54cbd6b0 CL |
1394 | if (rb->rg_direction == DMA_NONE) |
1395 | return false; | |
1396 | ||
91a10c52 | 1397 | rb->rg_iov.addr = ib_dma_map_single(device, |
54cbd6b0 CL |
1398 | (void *)rb->rg_base, |
1399 | rdmab_length(rb), | |
1400 | rb->rg_direction); | |
53b2c1cb CL |
1401 | if (ib_dma_mapping_error(device, rdmab_addr(rb))) { |
1402 | trace_xprtrdma_dma_maperr(rdmab_addr(rb)); | |
54cbd6b0 | 1403 | return false; |
53b2c1cb | 1404 | } |
54cbd6b0 | 1405 | |
91a10c52 | 1406 | rb->rg_device = device; |
54cbd6b0 CL |
1407 | rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey; |
1408 | return true; | |
1409 | } | |
1410 | ||
1411 | static void | |
1412 | rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb) | |
1413 | { | |
e89e8d8f CL |
1414 | if (!rb) |
1415 | return; | |
1416 | ||
54cbd6b0 CL |
1417 | if (!rpcrdma_regbuf_is_mapped(rb)) |
1418 | return; | |
1419 | ||
1420 | ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb), | |
1421 | rdmab_length(rb), rb->rg_direction); | |
1422 | rb->rg_device = NULL; | |
9128c3e7 CL |
1423 | } |
1424 | ||
1425 | /** | |
1426 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
9128c3e7 CL |
1427 | * @rb: regbuf to be deregistered and freed |
1428 | */ | |
1429 | void | |
13650c23 | 1430 | rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb) |
9128c3e7 | 1431 | { |
54cbd6b0 | 1432 | rpcrdma_dma_unmap_regbuf(rb); |
e531dcab | 1433 | kfree(rb); |
9128c3e7 CL |
1434 | } |
1435 | ||
995d312a CL |
1436 | /** |
1437 | * rpcrdma_ep_post - Post WRs to a transport's Send Queue | |
1438 | * @ia: transport's device information | |
1439 | * @ep: transport's RDMA endpoint information | |
1440 | * @req: rpcrdma_req containing the Send WR to post | |
c56c65fb | 1441 | * |
995d312a CL |
1442 | * Returns 0 if the post was successful, otherwise -ENOTCONN |
1443 | * is returned. | |
c56c65fb TT |
1444 | */ |
1445 | int | |
1446 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1447 | struct rpcrdma_ep *ep, | |
1448 | struct rpcrdma_req *req) | |
1449 | { | |
ae72950a | 1450 | struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr; |
655fec69 | 1451 | int rc; |
c56c65fb | 1452 | |
01bb35c8 CL |
1453 | if (!ep->rep_send_count || |
1454 | test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags)) { | |
ae72950a CL |
1455 | send_wr->send_flags |= IB_SEND_SIGNALED; |
1456 | ep->rep_send_count = ep->rep_send_batch; | |
1457 | } else { | |
1458 | send_wr->send_flags &= ~IB_SEND_SIGNALED; | |
1459 | --ep->rep_send_count; | |
1460 | } | |
ab03eff5 | 1461 | |
5f62412b | 1462 | rc = frwr_send(ia, req); |
ab03eff5 | 1463 | trace_xprtrdma_post_send(req, rc); |
c56c65fb | 1464 | if (rc) |
ab03eff5 | 1465 | return -ENOTCONN; |
7a89f9c6 | 1466 | return 0; |
c56c65fb TT |
1467 | } |
1468 | ||
6ceea368 | 1469 | static void |
7c8d9e7c | 1470 | rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp) |
f531a5db | 1471 | { |
7c8d9e7c | 1472 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
6ceea368 | 1473 | struct rpcrdma_ep *ep = &r_xprt->rx_ep; |
7c8d9e7c CL |
1474 | struct ib_recv_wr *wr, *bad_wr; |
1475 | int needed, count, rc; | |
f531a5db | 1476 | |
61c208a5 CL |
1477 | rc = 0; |
1478 | count = 0; | |
7c8d9e7c | 1479 | needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1); |
6ceea368 | 1480 | if (ep->rep_receive_count > needed) |
61c208a5 | 1481 | goto out; |
6ceea368 | 1482 | needed -= ep->rep_receive_count; |
f531a5db | 1483 | |
7c8d9e7c CL |
1484 | count = 0; |
1485 | wr = NULL; | |
1486 | while (needed) { | |
1487 | struct rpcrdma_regbuf *rb; | |
1488 | struct rpcrdma_rep *rep; | |
f531a5db | 1489 | |
7c8d9e7c CL |
1490 | spin_lock(&buf->rb_lock); |
1491 | rep = list_first_entry_or_null(&buf->rb_recv_bufs, | |
1492 | struct rpcrdma_rep, rr_list); | |
1493 | if (likely(rep)) | |
1494 | list_del(&rep->rr_list); | |
1495 | spin_unlock(&buf->rb_lock); | |
1496 | if (!rep) { | |
1497 | if (rpcrdma_create_rep(r_xprt, temp)) | |
1498 | break; | |
1499 | continue; | |
1500 | } | |
f531a5db | 1501 | |
7c8d9e7c CL |
1502 | rb = rep->rr_rdmabuf; |
1503 | if (!rpcrdma_regbuf_is_mapped(rb)) { | |
1504 | if (!__rpcrdma_dma_map_regbuf(&r_xprt->rx_ia, rb)) { | |
1505 | rpcrdma_recv_buffer_put(rep); | |
1506 | break; | |
1507 | } | |
1508 | } | |
f531a5db | 1509 | |
7c8d9e7c CL |
1510 | trace_xprtrdma_post_recv(rep->rr_recv_wr.wr_cqe); |
1511 | rep->rr_recv_wr.next = wr; | |
1512 | wr = &rep->rr_recv_wr; | |
1513 | ++count; | |
1514 | --needed; | |
1515 | } | |
1516 | if (!count) | |
61c208a5 | 1517 | goto out; |
7c8d9e7c | 1518 | |
d34ac5cd BVA |
1519 | rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr, |
1520 | (const struct ib_recv_wr **)&bad_wr); | |
7c8d9e7c CL |
1521 | if (rc) { |
1522 | for (wr = bad_wr; wr; wr = wr->next) { | |
1523 | struct rpcrdma_rep *rep; | |
1524 | ||
1525 | rep = container_of(wr, struct rpcrdma_rep, rr_recv_wr); | |
1526 | rpcrdma_recv_buffer_put(rep); | |
1527 | --count; | |
1528 | } | |
1529 | } | |
6ceea368 | 1530 | ep->rep_receive_count += count; |
61c208a5 | 1531 | out: |
7c8d9e7c | 1532 | trace_xprtrdma_post_recvs(r_xprt, count, rc); |
f531a5db | 1533 | } |