blob: c9fa0f27b10a9a77ea086a38dee560a09e54540b [file] [log] [blame]
Chuck Levera2268cf2018-05-04 15:34:32 -04001// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
\"Talpey, Thomas\f58851e2007-09-10 13:50:12 -04002/*
Chuck Lever62b56a62017-10-30 16:22:14 -04003 * Copyright (c) 2014-2017 Oracle. All rights reserved.
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04004 * 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.
\"Talpey, Thomas\f58851e2007-09-10 13:50:12 -040040 */
41
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040042/*
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
Alexey Dobriyana6b7a402011-06-06 10:43:46 +000052#include <linux/interrupt.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090053#include <linux/slab.h>
Chuck Lever0dd39ca2015-03-30 14:33:43 -040054#include <linux/sunrpc/addr.h>
Chuck Lever05c97462016-09-06 11:22:58 -040055#include <linux/sunrpc/svc_rdma.h>
Chuck Leverf3c66a22019-08-19 18:40:11 -040056#include <linux/log2.h>
Chuck Leverae729502017-10-20 10:48:12 -040057
58#include <asm-generic/barrier.h>
Chuck Lever65866f82014-05-28 10:33:59 -040059#include <asm/bitops.h>
Chuck Lever56a6bd12017-04-11 13:23:34 -040060
Chuck Lever0a904872017-02-08 17:00:35 -050061#include <rdma/ib_cm.h>
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040062
\"Talpey, Thomas\f58851e2007-09-10 13:50:12 -040063#include "xprt_rdma.h"
Chuck Leverb6e717cb2018-05-07 15:27:05 -040064#include <trace/events/rpcrdma.h>
\"Talpey, Thomas\f58851e2007-09-10 13:50:12 -040065
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040066/*
67 * Globals/Macros
68 */
69
Jeff Laytonf895b252014-11-17 16:58:04 -050070#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040071# define RPCDBG_FACILITY RPCDBG_TRANS
72#endif
73
74/*
75 * internal functions
76 */
Chuck Leverefd81e92018-05-04 15:35:41 -040077static void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc);
Chuck Lever96cedde2017-12-14 20:57:55 -050078static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
79static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf);
Chuck Leverd2832af2019-04-24 09:39:32 -040080static struct rpcrdma_regbuf *
81rpcrdma_regbuf_alloc(size_t size, enum dma_data_direction direction,
82 gfp_t flags);
83static void rpcrdma_regbuf_dma_unmap(struct rpcrdma_regbuf *rb);
84static void rpcrdma_regbuf_free(struct rpcrdma_regbuf *rb);
Chuck Lever6ceea362018-12-19 10:58:24 -050085static void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040086
Chuck Leverb8fe6772019-04-24 09:40:36 -040087/* Wait for outstanding transport work to finish. ib_drain_qp
88 * handles the drains in the wrong order for us, so open code
89 * them here.
Chuck Lever6d2d0ee2018-12-19 10:58:29 -050090 */
91static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040092{
Chuck Lever6d2d0ee2018-12-19 10:58:29 -050093 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040094
Chuck Lever6d2d0ee2018-12-19 10:58:29 -050095 /* Flush Receives, then wait for deferred Reply work
96 * to complete.
97 */
Chuck Levere1ede312019-04-09 17:04:09 -040098 ib_drain_rq(ia->ri_id->qp);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -040099
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500100 /* Deferred Reply processing might have scheduled
101 * local invalidations.
102 */
103 ib_drain_sq(ia->ri_id->qp);
Chuck Leverf1a03b72014-11-08 20:14:37 -0500104}
105
Chuck Lever31e62d22018-10-01 14:26:08 -0400106/**
Chuck Leverf9521d52018-10-01 14:26:13 -0400107 * rpcrdma_qp_event_handler - Handle one QP event (error notification)
108 * @event: details of the event
109 * @context: ep that owns QP where event occurred
110 *
111 * Called from the RDMA provider (device driver) possibly in an interrupt
112 * context.
113 */
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400114static void
Chuck Leverf9521d52018-10-01 14:26:13 -0400115rpcrdma_qp_event_handler(struct ib_event *event, void *context)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400116{
117 struct rpcrdma_ep *ep = context;
Chuck Lever643cf322017-12-20 16:31:45 -0500118 struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt,
119 rx_ep);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400120
Chuck Leverf9521d52018-10-01 14:26:13 -0400121 trace_xprtrdma_qp_event(r_xprt, event);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400122}
123
Chuck Lever2fa8f882016-03-04 11:28:53 -0500124/**
125 * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
126 * @cq: completion queue (ignored)
127 * @wc: completed WR
128 *
Chuck Lever4220a072015-10-24 17:26:45 -0400129 */
130static void
Chuck Lever2fa8f882016-03-04 11:28:53 -0500131rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400132{
Chuck Leverae729502017-10-20 10:48:12 -0400133 struct ib_cqe *cqe = wc->wr_cqe;
134 struct rpcrdma_sendctx *sc =
135 container_of(cqe, struct rpcrdma_sendctx, sc_cqe);
136
Chuck Lever2fa8f882016-03-04 11:28:53 -0500137 /* WARNING: Only wr_cqe and status are reliable at this point */
Chuck Leverab03eff2017-12-20 16:30:40 -0500138 trace_xprtrdma_wc_send(sc, wc);
Chuck Leverae729502017-10-20 10:48:12 -0400139 rpcrdma_sendctx_put_locked(sc);
Chuck Leverfc664482014-05-28 10:33:25 -0400140}
141
Chuck Lever552bf222016-03-04 11:28:36 -0500142/**
Chuck Lever1519e962016-09-15 10:57:49 -0400143 * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
Chuck Lever552bf222016-03-04 11:28:36 -0500144 * @cq: completion queue (ignored)
145 * @wc: completed WR
146 *
147 */
Chuck Leverfe97b472015-10-24 17:27:10 -0400148static void
Chuck Lever1519e962016-09-15 10:57:49 -0400149rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
Chuck Leverfc664482014-05-28 10:33:25 -0400150{
Chuck Lever552bf222016-03-04 11:28:36 -0500151 struct ib_cqe *cqe = wc->wr_cqe;
152 struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
153 rr_cqe);
Chuck Lever6ceea362018-12-19 10:58:24 -0500154 struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;
Chuck Leverfc664482014-05-28 10:33:25 -0400155
Chuck Lever6ceea362018-12-19 10:58:24 -0500156 /* WARNING: Only wr_cqe and status are reliable at this point */
Chuck Lever0e0b8542018-05-04 15:35:14 -0400157 trace_xprtrdma_wc_receive(wc);
Chuck Lever6ceea362018-12-19 10:58:24 -0500158 --r_xprt->rx_ep.rep_receive_count;
Chuck Lever85024272015-01-21 11:02:04 -0500159 if (wc->status != IB_WC_SUCCESS)
Chuck Lever6ceea362018-12-19 10:58:24 -0500160 goto out_flushed;
Chuck Leverfc664482014-05-28 10:33:25 -0400161
Chuck Lever85024272015-01-21 11:02:04 -0500162 /* status == SUCCESS means all fields in wc are trustworthy */
Chuck Lever96f87782017-08-03 14:30:03 -0400163 rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len);
Chuck Leverc8b920b2016-09-15 10:57:16 -0400164 rep->rr_wc_flags = wc->wc_flags;
165 rep->rr_inv_rkey = wc->ex.invalidate_rkey;
166
Chuck Lever91a10c52017-04-11 13:23:02 -0400167 ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf),
Chuck Lever6b1184c2015-01-21 11:04:25 -0500168 rdmab_addr(rep->rr_rdmabuf),
Chuck Levere2a67192017-08-03 14:30:44 -0400169 wc->byte_len, DMA_FROM_DEVICE);
Chuck Lever23826c72016-03-04 11:28:27 -0500170
Chuck Lever6ceea362018-12-19 10:58:24 -0500171 rpcrdma_post_recvs(r_xprt, false);
Chuck Leverd8f532d2017-10-16 15:01:30 -0400172 rpcrdma_reply_handler(rep);
Chuck Lever85024272015-01-21 11:02:04 -0500173 return;
Chuck Leverfe97b472015-10-24 17:27:10 -0400174
Chuck Lever6ceea362018-12-19 10:58:24 -0500175out_flushed:
Chuck Lever6ceea362018-12-19 10:58:24 -0500176 rpcrdma_recv_buffer_put(rep);
Chuck Leverfc664482014-05-28 10:33:25 -0400177}
178
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400179static void
180rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
181 struct rdma_conn_param *param)
182{
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400183 const struct rpcrdma_connect_private *pmsg = param->private_data;
184 unsigned int rsize, wsize;
185
Chuck Leverc8b920b2016-09-15 10:57:16 -0400186 /* Default settings for RPC-over-RDMA Version One */
Chuck Leverb5f0afb2017-02-08 16:59:54 -0500187 r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize;
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400188 rsize = RPCRDMA_V1_DEF_INLINE_SIZE;
189 wsize = RPCRDMA_V1_DEF_INLINE_SIZE;
190
191 if (pmsg &&
192 pmsg->cp_magic == rpcrdma_cmp_magic &&
193 pmsg->cp_version == RPCRDMA_CMP_VERSION) {
Chuck Leverc95a3c62017-02-08 17:00:02 -0500194 r_xprt->rx_ia.ri_implicit_roundup = true;
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400195 rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size);
196 wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
197 }
198
Chuck Lever94087e92019-04-24 09:40:20 -0400199 if (rsize < r_xprt->rx_ep.rep_inline_recv)
200 r_xprt->rx_ep.rep_inline_recv = rsize;
201 if (wsize < r_xprt->rx_ep.rep_inline_send)
202 r_xprt->rx_ep.rep_inline_send = wsize;
203 dprintk("RPC: %s: max send %u, max recv %u\n", __func__,
204 r_xprt->rx_ep.rep_inline_send,
205 r_xprt->rx_ep.rep_inline_recv);
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400206 rpcrdma_set_max_header_sizes(r_xprt);
207}
208
Chuck Leverae382882018-10-01 14:25:47 -0400209/**
210 * rpcrdma_cm_event_handler - Handle RDMA CM events
211 * @id: rdma_cm_id on which an event has occurred
212 * @event: details of the event
213 *
214 * Called with @id's mutex held. Returns 1 if caller should
215 * destroy @id, otherwise 0.
216 */
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400217static int
Chuck Leverae382882018-10-01 14:25:47 -0400218rpcrdma_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400219{
Chuck Levered97f1f2018-10-01 14:25:52 -0400220 struct rpcrdma_xprt *r_xprt = id->context;
221 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
222 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
223 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400224
Chuck Leverae382882018-10-01 14:25:47 -0400225 might_sleep();
226
Chuck Levered97f1f2018-10-01 14:25:52 -0400227 trace_xprtrdma_cm_event(r_xprt, event);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400228 switch (event->event) {
229 case RDMA_CM_EVENT_ADDR_RESOLVED:
230 case RDMA_CM_EVENT_ROUTE_RESOLVED:
Tom Talpey5675add2008-10-09 15:01:41 -0400231 ia->ri_async_rc = 0;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400232 complete(&ia->ri_done);
Chuck Lever316a6162018-10-01 14:26:03 -0400233 return 0;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400234 case RDMA_CM_EVENT_ADDR_ERROR:
Chuck Lever52d28fe2018-05-04 15:34:37 -0400235 ia->ri_async_rc = -EPROTO;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400236 complete(&ia->ri_done);
Chuck Lever316a6162018-10-01 14:26:03 -0400237 return 0;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400238 case RDMA_CM_EVENT_ROUTE_ERROR:
239 ia->ri_async_rc = -ENETUNREACH;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400240 complete(&ia->ri_done);
Chuck Lever316a6162018-10-01 14:26:03 -0400241 return 0;
Chuck Leverbebd0312017-04-11 13:23:10 -0400242 case RDMA_CM_EVENT_DEVICE_REMOVAL:
243#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
Chuck Leverd461f1f2017-12-14 20:56:50 -0500244 pr_info("rpcrdma: removing device %s for %s:%s\n",
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400245 ia->ri_id->device->name,
Chuck Levered97f1f2018-10-01 14:25:52 -0400246 rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt));
Chuck Leverbebd0312017-04-11 13:23:10 -0400247#endif
248 set_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags);
249 ep->rep_connected = -ENODEV;
Chuck Levered97f1f2018-10-01 14:25:52 -0400250 xprt_force_disconnect(xprt);
Chuck Leverbebd0312017-04-11 13:23:10 -0400251 wait_for_completion(&ia->ri_remove_done);
252
253 ia->ri_id = NULL;
Chuck Leverbebd0312017-04-11 13:23:10 -0400254 /* Return 1 to ensure the core destroys the id. */
255 return 1;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400256 case RDMA_CM_EVENT_ESTABLISHED:
Chuck Levered97f1f2018-10-01 14:25:52 -0400257 ++xprt->connect_cookie;
Chuck Leveraadc5a92018-10-01 14:25:57 -0400258 ep->rep_connected = 1;
Chuck Levered97f1f2018-10-01 14:25:52 -0400259 rpcrdma_update_connect_private(r_xprt, &event->param.conn);
Chuck Lever31e62d22018-10-01 14:26:08 -0400260 wake_up_all(&ep->rep_connect_wait);
261 break;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400262 case RDMA_CM_EVENT_CONNECT_ERROR:
Chuck Leveraadc5a92018-10-01 14:25:57 -0400263 ep->rep_connected = -ENOTCONN;
Chuck Lever31e62d22018-10-01 14:26:08 -0400264 goto disconnected;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400265 case RDMA_CM_EVENT_UNREACHABLE:
Chuck Leveraadc5a92018-10-01 14:25:57 -0400266 ep->rep_connected = -ENETUNREACH;
Chuck Lever31e62d22018-10-01 14:26:08 -0400267 goto disconnected;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400268 case RDMA_CM_EVENT_REJECTED:
Chuck Leverd461f1f2017-12-14 20:56:50 -0500269 dprintk("rpcrdma: connection to %s:%s rejected: %s\n",
Chuck Levered97f1f2018-10-01 14:25:52 -0400270 rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt),
Chuck Lever0a904872017-02-08 17:00:35 -0500271 rdma_reject_msg(id, event->status));
Chuck Leveraadc5a92018-10-01 14:25:57 -0400272 ep->rep_connected = -ECONNREFUSED;
Chuck Lever0a904872017-02-08 17:00:35 -0500273 if (event->status == IB_CM_REJ_STALE_CONN)
Chuck Leveraadc5a92018-10-01 14:25:57 -0400274 ep->rep_connected = -EAGAIN;
Chuck Lever31e62d22018-10-01 14:26:08 -0400275 goto disconnected;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400276 case RDMA_CM_EVENT_DISCONNECTED:
Chuck Leveraadc5a92018-10-01 14:25:57 -0400277 ep->rep_connected = -ECONNABORTED;
Chuck Lever31e62d22018-10-01 14:26:08 -0400278disconnected:
279 xprt_force_disconnect(xprt);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400280 wake_up_all(&ep->rep_connect_wait);
Chuck Lever316a6162018-10-01 14:26:03 -0400281 break;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400282 default:
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400283 break;
284 }
285
Chuck Lever5f624122018-12-19 10:59:01 -0500286 dprintk("RPC: %s: %s:%s on %s/frwr: %s\n", __func__,
Chuck Lever316a6162018-10-01 14:26:03 -0400287 rpcrdma_addrstr(r_xprt), rpcrdma_portstr(r_xprt),
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400288 ia->ri_id->device->name, rdma_event_msg(event->event));
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400289 return 0;
290}
291
292static struct rdma_cm_id *
Chuck Leverdd229ce2017-12-14 20:56:58 -0500293rpcrdma_create_id(struct rpcrdma_xprt *xprt, struct rpcrdma_ia *ia)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400294{
Chuck Lever109b88a2016-11-29 10:52:40 -0500295 unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400296 struct rdma_cm_id *id;
297 int rc;
298
Chuck Leverb4744e02017-12-20 16:31:29 -0500299 trace_xprtrdma_conn_start(xprt);
300
Tom Talpey1a954052008-10-09 15:01:31 -0400301 init_completion(&ia->ri_done);
Chuck Leverbebd0312017-04-11 13:23:10 -0400302 init_completion(&ia->ri_remove_done);
Tom Talpey1a954052008-10-09 15:01:31 -0400303
Chuck Leverae382882018-10-01 14:25:47 -0400304 id = rdma_create_id(xprt->rx_xprt.xprt_net, rpcrdma_cm_event_handler,
Chuck Lever107c4be2018-05-04 15:34:42 -0400305 xprt, RDMA_PS_TCP, IB_QPT_RC);
Chuck Leverddbb3472018-12-19 10:59:39 -0500306 if (IS_ERR(id))
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400307 return id;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400308
Tom Talpey5675add2008-10-09 15:01:41 -0400309 ia->ri_async_rc = -ETIMEDOUT;
Chuck Leverdd229ce2017-12-14 20:56:58 -0500310 rc = rdma_resolve_addr(id, NULL,
311 (struct sockaddr *)&xprt->rx_xprt.addr,
312 RDMA_RESOLVE_TIMEOUT);
Chuck Leverddbb3472018-12-19 10:59:39 -0500313 if (rc)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400314 goto out;
Chuck Lever109b88a2016-11-29 10:52:40 -0500315 rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout);
316 if (rc < 0) {
Chuck Leverb4744e02017-12-20 16:31:29 -0500317 trace_xprtrdma_conn_tout(xprt);
Chuck Lever109b88a2016-11-29 10:52:40 -0500318 goto out;
319 }
Devesh Sharmad0f36c42015-08-03 13:05:04 -0400320
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400321 rc = ia->ri_async_rc;
322 if (rc)
323 goto out;
324
Tom Talpey5675add2008-10-09 15:01:41 -0400325 ia->ri_async_rc = -ETIMEDOUT;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400326 rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
Chuck Leverddbb3472018-12-19 10:59:39 -0500327 if (rc)
Chuck Lever56a6bd12017-04-11 13:23:34 -0400328 goto out;
Chuck Lever109b88a2016-11-29 10:52:40 -0500329 rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout);
330 if (rc < 0) {
Chuck Leverb4744e02017-12-20 16:31:29 -0500331 trace_xprtrdma_conn_tout(xprt);
Chuck Lever56a6bd12017-04-11 13:23:34 -0400332 goto out;
Chuck Lever109b88a2016-11-29 10:52:40 -0500333 }
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400334 rc = ia->ri_async_rc;
335 if (rc)
Chuck Lever56a6bd12017-04-11 13:23:34 -0400336 goto out;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400337
338 return id;
Chuck Lever56a6bd12017-04-11 13:23:34 -0400339
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400340out:
341 rdma_destroy_id(id);
342 return ERR_PTR(rc);
343}
344
345/*
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400346 * Exported functions.
347 */
348
Chuck Leverfff09592017-04-11 13:22:54 -0400349/**
350 * rpcrdma_ia_open - Open and initialize an Interface Adapter.
Chuck Leverdd229ce2017-12-14 20:56:58 -0500351 * @xprt: transport with IA to (re)initialize
Chuck Leverfff09592017-04-11 13:22:54 -0400352 *
353 * Returns 0 on success, negative errno if an appropriate
354 * Interface Adapter could not be found and opened.
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400355 */
356int
Chuck Leverdd229ce2017-12-14 20:56:58 -0500357rpcrdma_ia_open(struct rpcrdma_xprt *xprt)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400358{
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400359 struct rpcrdma_ia *ia = &xprt->rx_ia;
Chuck Leverd1ed8572015-08-03 13:03:30 -0400360 int rc;
361
Chuck Leverdd229ce2017-12-14 20:56:58 -0500362 ia->ri_id = rpcrdma_create_id(xprt, ia);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400363 if (IS_ERR(ia->ri_id)) {
364 rc = PTR_ERR(ia->ri_id);
Chuck Leverfff09592017-04-11 13:22:54 -0400365 goto out_err;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400366 }
367
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400368 ia->ri_pd = ib_alloc_pd(ia->ri_id->device, 0);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400369 if (IS_ERR(ia->ri_pd)) {
370 rc = PTR_ERR(ia->ri_pd);
Chuck Leverb54054c2016-06-29 13:53:27 -0400371 pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc);
Chuck Leverfff09592017-04-11 13:22:54 -0400372 goto out_err;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400373 }
374
Chuck Leverfff09592017-04-11 13:22:54 -0400375 switch (xprt_rdma_memreg_strategy) {
Chuck Leverce5b3712017-12-14 20:57:47 -0500376 case RPCRDMA_FRWR:
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400377 if (frwr_is_supported(ia->ri_id->device))
Chuck Leverb54054c2016-06-29 13:53:27 -0400378 break;
Chuck Leverb54054c2016-06-29 13:53:27 -0400379 /*FALLTHROUGH*/
Tom Talpeybd7ed1d2008-10-09 15:00:09 -0400380 default:
Chuck Leverfff09592017-04-11 13:22:54 -0400381 pr_err("rpcrdma: Device %s does not support memreg mode %d\n",
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400382 ia->ri_id->device->name, xprt_rdma_memreg_strategy);
Chuck Leverb54054c2016-06-29 13:53:27 -0400383 rc = -EINVAL;
Chuck Leverfff09592017-04-11 13:22:54 -0400384 goto out_err;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400385 }
386
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400387 return 0;
Chuck Lever5ae711a2015-01-21 11:03:19 -0500388
Chuck Leverfff09592017-04-11 13:22:54 -0400389out_err:
390 rpcrdma_ia_close(ia);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400391 return rc;
392}
393
Chuck Leverfff09592017-04-11 13:22:54 -0400394/**
Chuck Leverbebd0312017-04-11 13:23:10 -0400395 * rpcrdma_ia_remove - Handle device driver unload
396 * @ia: interface adapter being removed
397 *
398 * Divest transport H/W resources associated with this adapter,
399 * but allow it to be restored later.
400 */
401void
402rpcrdma_ia_remove(struct rpcrdma_ia *ia)
403{
404 struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
405 rx_ia);
406 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
407 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
408 struct rpcrdma_req *req;
409 struct rpcrdma_rep *rep;
410
Chuck Lever3b39f522019-08-19 18:45:37 -0400411 cancel_work_sync(&buf->rb_refresh_worker);
Chuck Leverbebd0312017-04-11 13:23:10 -0400412
413 /* This is similar to rpcrdma_ep_destroy, but:
414 * - Don't cancel the connect worker.
415 * - Don't call rpcrdma_ep_disconnect, which waits
416 * for another conn upcall, which will deadlock.
417 * - rdma_disconnect is unneeded, the underlying
418 * connection is already gone.
419 */
420 if (ia->ri_id->qp) {
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500421 rpcrdma_xprt_drain(r_xprt);
Chuck Leverbebd0312017-04-11 13:23:10 -0400422 rdma_destroy_qp(ia->ri_id);
423 ia->ri_id->qp = NULL;
424 }
425 ib_free_cq(ep->rep_attr.recv_cq);
Chuck Lever25524282018-03-19 14:23:16 -0400426 ep->rep_attr.recv_cq = NULL;
Chuck Leverbebd0312017-04-11 13:23:10 -0400427 ib_free_cq(ep->rep_attr.send_cq);
Chuck Lever25524282018-03-19 14:23:16 -0400428 ep->rep_attr.send_cq = NULL;
Chuck Leverbebd0312017-04-11 13:23:10 -0400429
430 /* The ULP is responsible for ensuring all DMA
431 * mappings and MRs are gone.
432 */
433 list_for_each_entry(rep, &buf->rb_recv_bufs, rr_list)
Chuck Leverd2832af2019-04-24 09:39:32 -0400434 rpcrdma_regbuf_dma_unmap(rep->rr_rdmabuf);
Chuck Leverbebd0312017-04-11 13:23:10 -0400435 list_for_each_entry(req, &buf->rb_allreqs, rl_all) {
Chuck Leverd2832af2019-04-24 09:39:32 -0400436 rpcrdma_regbuf_dma_unmap(req->rl_rdmabuf);
437 rpcrdma_regbuf_dma_unmap(req->rl_sendbuf);
438 rpcrdma_regbuf_dma_unmap(req->rl_recvbuf);
Chuck Leverbebd0312017-04-11 13:23:10 -0400439 }
Chuck Lever96cedde2017-12-14 20:57:55 -0500440 rpcrdma_mrs_destroy(buf);
Chuck Lever25524282018-03-19 14:23:16 -0400441 ib_dealloc_pd(ia->ri_pd);
442 ia->ri_pd = NULL;
Chuck Leverbebd0312017-04-11 13:23:10 -0400443
444 /* Allow waiters to continue */
445 complete(&ia->ri_remove_done);
Chuck Leverb4744e02017-12-20 16:31:29 -0500446
447 trace_xprtrdma_remove(r_xprt);
Chuck Leverbebd0312017-04-11 13:23:10 -0400448}
449
450/**
Chuck Leverfff09592017-04-11 13:22:54 -0400451 * rpcrdma_ia_close - Clean up/close an IA.
452 * @ia: interface adapter to close
453 *
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400454 */
455void
456rpcrdma_ia_close(struct rpcrdma_ia *ia)
457{
Tom Talpeyfee08ca2008-10-09 15:01:00 -0400458 if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
459 if (ia->ri_id->qp)
460 rdma_destroy_qp(ia->ri_id);
Chuck Lever56a6bd12017-04-11 13:23:34 -0400461 rdma_destroy_id(ia->ri_id);
Tom Talpeyfee08ca2008-10-09 15:01:00 -0400462 }
Chuck Leverfff09592017-04-11 13:22:54 -0400463 ia->ri_id = NULL;
Chuck Lever6d446982015-05-26 11:51:27 -0400464
465 /* If the pd is still busy, xprtrdma missed freeing a resource */
466 if (ia->ri_pd && !IS_ERR(ia->ri_pd))
Jason Gunthorpe7dd78642015-08-05 14:34:31 -0600467 ib_dealloc_pd(ia->ri_pd);
Chuck Leverfff09592017-04-11 13:22:54 -0400468 ia->ri_pd = NULL;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400469}
470
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400471/**
472 * rpcrdma_ep_create - Create unconnected endpoint
473 * @r_xprt: transport to instantiate
474 *
475 * Returns zero on success, or a negative errno.
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400476 */
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400477int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400478{
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400479 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
480 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400481 struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private;
Chuck Leverfc664482014-05-28 10:33:25 -0400482 struct ib_cq *sendcq, *recvcq;
Chuck Lever914fcad2018-05-04 15:34:48 -0400483 unsigned int max_sge;
Chuck Lever2fa8f882016-03-04 11:28:53 -0500484 int rc;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400485
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400486 ep->rep_max_requests = xprt_rdma_slot_table_entries;
Chuck Lever94087e92019-04-24 09:40:20 -0400487 ep->rep_inline_send = xprt_rdma_max_inline_write;
488 ep->rep_inline_recv = xprt_rdma_max_inline_read;
489
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400490 max_sge = min_t(unsigned int, ia->ri_id->device->attrs.max_send_sge,
Chuck Levereed50872017-03-11 15:52:47 -0500491 RPCRDMA_MAX_SEND_SGES);
Chuck Lever16f906d2017-02-08 17:00:10 -0500492 if (max_sge < RPCRDMA_MIN_SEND_SGES) {
493 pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge);
Chuck Leverb3221d62015-08-03 13:03:39 -0400494 return -ENOMEM;
495 }
Chuck Lever1179e2c2018-01-31 12:34:05 -0500496 ia->ri_max_send_sges = max_sge;
Chuck Leverb3221d62015-08-03 13:03:39 -0400497
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400498 rc = frwr_open(ia, ep);
Chuck Lever914fcad2018-05-04 15:34:48 -0400499 if (rc)
500 return rc;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400501
Chuck Leverf9521d52018-10-01 14:26:13 -0400502 ep->rep_attr.event_handler = rpcrdma_qp_event_handler;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400503 ep->rep_attr.qp_context = ep;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400504 ep->rep_attr.srq = NULL;
Chuck Lever16f906d2017-02-08 17:00:10 -0500505 ep->rep_attr.cap.max_send_sge = max_sge;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400506 ep->rep_attr.cap.max_recv_sge = 1;
507 ep->rep_attr.cap.max_inline_data = 0;
508 ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
509 ep->rep_attr.qp_type = IB_QPT_RC;
510 ep->rep_attr.port_num = ~0;
511
512 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
513 "iovs: send %d recv %d\n",
514 __func__,
515 ep->rep_attr.cap.max_send_wr,
516 ep->rep_attr.cap.max_recv_wr,
517 ep->rep_attr.cap.max_send_sge,
518 ep->rep_attr.cap.max_recv_sge);
519
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400520 ep->rep_send_batch = ep->rep_max_requests >> 3;
Chuck Leverae729502017-10-20 10:48:12 -0400521 ep->rep_send_count = ep->rep_send_batch;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400522 init_waitqueue_head(&ep->rep_connect_wait);
Chuck Lever6ceea362018-12-19 10:58:24 -0500523 ep->rep_receive_count = 0;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400524
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400525 sendcq = ib_alloc_cq(ia->ri_id->device, NULL,
Chuck Lever2fa8f882016-03-04 11:28:53 -0500526 ep->rep_attr.cap.max_send_wr + 1,
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400527 ia->ri_id->device->num_comp_vectors > 1 ? 1 : 0,
Nicolas Morey-Chaisemartina4cb5bd2019-02-05 18:21:02 +0100528 IB_POLL_WORKQUEUE);
Chuck Leverfc664482014-05-28 10:33:25 -0400529 if (IS_ERR(sendcq)) {
530 rc = PTR_ERR(sendcq);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400531 goto out1;
532 }
533
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400534 recvcq = ib_alloc_cq(ia->ri_id->device, NULL,
Chuck Lever552bf222016-03-04 11:28:36 -0500535 ep->rep_attr.cap.max_recv_wr + 1,
Chuck Leverd8f532d2017-10-16 15:01:30 -0400536 0, IB_POLL_WORKQUEUE);
Chuck Leverfc664482014-05-28 10:33:25 -0400537 if (IS_ERR(recvcq)) {
538 rc = PTR_ERR(recvcq);
Chuck Leverfc664482014-05-28 10:33:25 -0400539 goto out2;
540 }
541
Chuck Leverfc664482014-05-28 10:33:25 -0400542 ep->rep_attr.send_cq = sendcq;
543 ep->rep_attr.recv_cq = recvcq;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400544
545 /* Initialize cma parameters */
Chuck Leverb2dde942016-05-02 14:43:03 -0400546 memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma));
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400547
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400548 /* Prepare RDMA-CM private message */
549 pmsg->cp_magic = rpcrdma_cmp_magic;
550 pmsg->cp_version = RPCRDMA_CMP_VERSION;
Chuck Lever5f624122018-12-19 10:59:01 -0500551 pmsg->cp_flags |= RPCRDMA_CMP_F_SND_W_INV_OK;
Chuck Lever94087e92019-04-24 09:40:20 -0400552 pmsg->cp_send_size = rpcrdma_encode_buffer_size(ep->rep_inline_send);
553 pmsg->cp_recv_size = rpcrdma_encode_buffer_size(ep->rep_inline_recv);
Chuck Lever87cfb9a2016-09-15 10:57:07 -0400554 ep->rep_remote_cma.private_data = pmsg;
555 ep->rep_remote_cma.private_data_len = sizeof(*pmsg);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400556
557 /* Client offers RDMA Read but does not initiate */
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400558 ep->rep_remote_cma.initiator_depth = 0;
Chuck Leverb7e85fff2018-02-28 15:30:33 -0500559 ep->rep_remote_cma.responder_resources =
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400560 min_t(int, U8_MAX, ia->ri_id->device->attrs.max_qp_rd_atom);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400561
Chuck Leverb2dde942016-05-02 14:43:03 -0400562 /* Limit transport retries so client can detect server
563 * GID changes quickly. RPC layer handles re-establishing
564 * transport connection and retransmission.
565 */
566 ep->rep_remote_cma.retry_count = 6;
567
568 /* RPC-over-RDMA handles its own flow control. In addition,
569 * make all RNR NAKs visible so we know that RPC-over-RDMA
570 * flow control is working correctly (no NAKs should be seen).
571 */
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400572 ep->rep_remote_cma.flow_control = 0;
573 ep->rep_remote_cma.rnr_retry_count = 0;
574
575 return 0;
576
577out2:
Chuck Lever2fa8f882016-03-04 11:28:53 -0500578 ib_free_cq(sendcq);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400579out1:
580 return rc;
581}
582
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400583/**
584 * rpcrdma_ep_destroy - Disconnect and destroy endpoint.
585 * @r_xprt: transport instance to shut down
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400586 *
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400587 */
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400588void rpcrdma_ep_destroy(struct rpcrdma_xprt *r_xprt)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400589{
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400590 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
591 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
592
Chuck Lever25524282018-03-19 14:23:16 -0400593 if (ia->ri_id && ia->ri_id->qp) {
Chuck Lever550d7502016-05-02 14:41:47 -0400594 rpcrdma_ep_disconnect(ep, ia);
Tom Talpeyfee08ca2008-10-09 15:01:00 -0400595 rdma_destroy_qp(ia->ri_id);
596 ia->ri_id->qp = NULL;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400597 }
598
Chuck Lever25524282018-03-19 14:23:16 -0400599 if (ep->rep_attr.recv_cq)
600 ib_free_cq(ep->rep_attr.recv_cq);
601 if (ep->rep_attr.send_cq)
602 ib_free_cq(ep->rep_attr.send_cq);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400603}
604
Chuck Levera9b0e382017-04-11 13:23:26 -0400605/* Re-establish a connection after a device removal event.
606 * Unlike a normal reconnection, a fresh PD and a new set
607 * of MRs and buffers is needed.
608 */
609static int
610rpcrdma_ep_recreate_xprt(struct rpcrdma_xprt *r_xprt,
611 struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
612{
Chuck Levera9b0e382017-04-11 13:23:26 -0400613 int rc, err;
614
Chuck Leverb4744e02017-12-20 16:31:29 -0500615 trace_xprtrdma_reinsert(r_xprt);
Chuck Levera9b0e382017-04-11 13:23:26 -0400616
617 rc = -EHOSTUNREACH;
Chuck Leverdd229ce2017-12-14 20:56:58 -0500618 if (rpcrdma_ia_open(r_xprt))
Chuck Levera9b0e382017-04-11 13:23:26 -0400619 goto out1;
620
621 rc = -ENOMEM;
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400622 err = rpcrdma_ep_create(r_xprt);
Chuck Levera9b0e382017-04-11 13:23:26 -0400623 if (err) {
624 pr_err("rpcrdma: rpcrdma_ep_create returned %d\n", err);
625 goto out2;
626 }
627
628 rc = -ENETUNREACH;
629 err = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
630 if (err) {
631 pr_err("rpcrdma: rdma_create_qp returned %d\n", err);
632 goto out3;
633 }
634
Chuck Lever96cedde2017-12-14 20:57:55 -0500635 rpcrdma_mrs_create(r_xprt);
Chuck Levera9b0e382017-04-11 13:23:26 -0400636 return 0;
637
638out3:
Chuck Lever86c4ccd2019-04-24 09:40:25 -0400639 rpcrdma_ep_destroy(r_xprt);
Chuck Levera9b0e382017-04-11 13:23:26 -0400640out2:
641 rpcrdma_ia_close(ia);
642out1:
643 return rc;
644}
645
Chuck Lever18908962017-04-11 13:23:18 -0400646static int
647rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep,
648 struct rpcrdma_ia *ia)
649{
Chuck Lever18908962017-04-11 13:23:18 -0400650 struct rdma_cm_id *id, *old;
651 int err, rc;
652
Chuck Leverb4744e02017-12-20 16:31:29 -0500653 trace_xprtrdma_reconnect(r_xprt);
Chuck Lever18908962017-04-11 13:23:18 -0400654
655 rpcrdma_ep_disconnect(ep, ia);
656
657 rc = -EHOSTUNREACH;
Chuck Leverdd229ce2017-12-14 20:56:58 -0500658 id = rpcrdma_create_id(r_xprt, ia);
Chuck Lever18908962017-04-11 13:23:18 -0400659 if (IS_ERR(id))
660 goto out;
661
662 /* As long as the new ID points to the same device as the
663 * old ID, we can reuse the transport's existing PD and all
664 * previously allocated MRs. Also, the same device means
665 * the transport's previous DMA mappings are still valid.
666 *
667 * This is a sanity check only. There should be no way these
668 * point to two different devices here.
669 */
670 old = id;
671 rc = -ENETUNREACH;
Chuck Leverf19bd0b2019-04-24 09:40:04 -0400672 if (ia->ri_id->device != id->device) {
Chuck Lever18908962017-04-11 13:23:18 -0400673 pr_err("rpcrdma: can't reconnect on different device!\n");
674 goto out_destroy;
675 }
676
677 err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
Chuck Leverddbb3472018-12-19 10:59:39 -0500678 if (err)
Chuck Lever18908962017-04-11 13:23:18 -0400679 goto out_destroy;
Chuck Lever18908962017-04-11 13:23:18 -0400680
681 /* Atomically replace the transport's ID and QP. */
682 rc = 0;
683 old = ia->ri_id;
684 ia->ri_id = id;
685 rdma_destroy_qp(old);
686
687out_destroy:
Chuck Lever56a6bd12017-04-11 13:23:34 -0400688 rdma_destroy_id(old);
Chuck Lever18908962017-04-11 13:23:18 -0400689out:
690 return rc;
691}
692
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400693/*
694 * Connect unconnected endpoint.
695 */
696int
697rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
698{
Chuck Lever0a904872017-02-08 17:00:35 -0500699 struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
700 rx_ia);
Chuck Lever31e62d22018-10-01 14:26:08 -0400701 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
Chuck Lever18908962017-04-11 13:23:18 -0400702 int rc;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400703
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400704retry:
Chuck Lever18908962017-04-11 13:23:18 -0400705 switch (ep->rep_connected) {
706 case 0:
Chuck Leverec62f402014-05-28 10:34:07 -0400707 dprintk("RPC: %s: connecting...\n", __func__);
708 rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
709 if (rc) {
Chuck Lever18908962017-04-11 13:23:18 -0400710 rc = -ENETUNREACH;
711 goto out_noupdate;
Chuck Leverec62f402014-05-28 10:34:07 -0400712 }
Chuck Lever18908962017-04-11 13:23:18 -0400713 break;
Chuck Levera9b0e382017-04-11 13:23:26 -0400714 case -ENODEV:
715 rc = rpcrdma_ep_recreate_xprt(r_xprt, ep, ia);
716 if (rc)
717 goto out_noupdate;
718 break;
Chuck Lever18908962017-04-11 13:23:18 -0400719 default:
720 rc = rpcrdma_ep_reconnect(r_xprt, ep, ia);
721 if (rc)
722 goto out;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400723 }
724
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400725 ep->rep_connected = 0;
Chuck Lever31e62d22018-10-01 14:26:08 -0400726 xprt_clear_connected(xprt);
727
Chuck Lever8d4fb8f2018-07-28 10:46:47 -0400728 rpcrdma_post_recvs(r_xprt, true);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400729
730 rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
Chuck Leverddbb3472018-12-19 10:59:39 -0500731 if (rc)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400732 goto out;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400733
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400734 wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400735 if (ep->rep_connected <= 0) {
Chuck Lever0a904872017-02-08 17:00:35 -0500736 if (ep->rep_connected == -EAGAIN)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400737 goto retry;
738 rc = ep->rep_connected;
Chuck Lever0a904872017-02-08 17:00:35 -0500739 goto out;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400740 }
741
Chuck Lever0a904872017-02-08 17:00:35 -0500742 dprintk("RPC: %s: connected\n", __func__);
Chuck Lever7c8d9e72018-05-04 15:35:20 -0400743
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400744out:
745 if (rc)
746 ep->rep_connected = rc;
Chuck Lever18908962017-04-11 13:23:18 -0400747
748out_noupdate:
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400749 return rc;
750}
751
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500752/**
753 * rpcrdma_ep_disconnect - Disconnect underlying transport
754 * @ep: endpoint to disconnect
755 * @ia: associated interface adapter
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400756 *
757 * This is separate from destroy to facilitate the ability
758 * to reconnect without recreating the endpoint.
759 *
760 * This call is not reentrant, and must not be made in parallel
761 * on the same endpoint.
762 */
Chuck Lever282191c2014-07-29 17:25:55 -0400763void
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400764rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
765{
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500766 struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt,
767 rx_ep);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400768 int rc;
769
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500770 /* returns without wait if ID is not connected */
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400771 rc = rdma_disconnect(ia->ri_id);
Chuck Leverb4744e02017-12-20 16:31:29 -0500772 if (!rc)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400773 wait_event_interruptible(ep->rep_connect_wait,
774 ep->rep_connected != 1);
Chuck Leverb4744e02017-12-20 16:31:29 -0500775 else
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400776 ep->rep_connected = rc;
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500777 trace_xprtrdma_disconnect(r_xprt, rc);
Chuck Lever550d7502016-05-02 14:41:47 -0400778
Chuck Lever6d2d0ee2018-12-19 10:58:29 -0500779 rpcrdma_xprt_drain(r_xprt);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -0400780}
781
Chuck Leverae729502017-10-20 10:48:12 -0400782/* Fixed-size circular FIFO queue. This implementation is wait-free and
783 * lock-free.
784 *
785 * Consumer is the code path that posts Sends. This path dequeues a
786 * sendctx for use by a Send operation. Multiple consumer threads
787 * are serialized by the RPC transport lock, which allows only one
788 * ->send_request call at a time.
789 *
790 * Producer is the code path that handles Send completions. This path
791 * enqueues a sendctx that has been completed. Multiple producer
792 * threads are serialized by the ib_poll_cq() function.
793 */
794
795/* rpcrdma_sendctxs_destroy() assumes caller has already quiesced
Chuck Leverb8fe6772019-04-24 09:40:36 -0400796 * queue activity, and rpcrdma_xprt_drain has flushed all remaining
797 * Send requests.
Chuck Leverae729502017-10-20 10:48:12 -0400798 */
799static void rpcrdma_sendctxs_destroy(struct rpcrdma_buffer *buf)
800{
801 unsigned long i;
802
803 for (i = 0; i <= buf->rb_sc_last; i++)
804 kfree(buf->rb_sc_ctxs[i]);
805 kfree(buf->rb_sc_ctxs);
806}
807
808static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ia *ia)
809{
810 struct rpcrdma_sendctx *sc;
811
Gustavo A. R. Silva66d42182019-01-30 18:46:22 -0600812 sc = kzalloc(struct_size(sc, sc_sges, ia->ri_max_send_sges),
Chuck Leverae729502017-10-20 10:48:12 -0400813 GFP_KERNEL);
814 if (!sc)
815 return NULL;
816
817 sc->sc_wr.wr_cqe = &sc->sc_cqe;
818 sc->sc_wr.sg_list = sc->sc_sges;
819 sc->sc_wr.opcode = IB_WR_SEND;
820 sc->sc_cqe.done = rpcrdma_wc_send;
821 return sc;
822}
823
824static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt)
825{
826 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
827 struct rpcrdma_sendctx *sc;
828 unsigned long i;
829
830 /* Maximum number of concurrent outstanding Send WRs. Capping
831 * the circular queue size stops Send Queue overflow by causing
832 * the ->send_request call to fail temporarily before too many
833 * Sends are posted.
834 */
835 i = buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS;
836 dprintk("RPC: %s: allocating %lu send_ctxs\n", __func__, i);
837 buf->rb_sc_ctxs = kcalloc(i, sizeof(sc), GFP_KERNEL);
838 if (!buf->rb_sc_ctxs)
839 return -ENOMEM;
840
841 buf->rb_sc_last = i - 1;
842 for (i = 0; i <= buf->rb_sc_last; i++) {
843 sc = rpcrdma_sendctx_create(&r_xprt->rx_ia);
844 if (!sc)
Dan Carpenter6e17f582019-01-05 16:06:48 +0300845 return -ENOMEM;
Chuck Leverae729502017-10-20 10:48:12 -0400846
847 sc->sc_xprt = r_xprt;
848 buf->rb_sc_ctxs[i] = sc;
849 }
850
851 return 0;
Chuck Leverae729502017-10-20 10:48:12 -0400852}
853
854/* The sendctx queue is not guaranteed to have a size that is a
855 * power of two, thus the helpers in circ_buf.h cannot be used.
856 * The other option is to use modulus (%), which can be expensive.
857 */
858static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf,
859 unsigned long item)
860{
861 return likely(item < buf->rb_sc_last) ? item + 1 : 0;
862}
863
864/**
865 * rpcrdma_sendctx_get_locked - Acquire a send context
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400866 * @r_xprt: controlling transport instance
Chuck Leverae729502017-10-20 10:48:12 -0400867 *
868 * Returns pointer to a free send completion context; or NULL if
869 * the queue is empty.
870 *
871 * Usage: Called to acquire an SGE array before preparing a Send WR.
872 *
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400873 * The caller serializes calls to this function (per transport), and
874 * provides an effective memory barrier that flushes the new value
Chuck Leverae729502017-10-20 10:48:12 -0400875 * of rb_sc_head.
876 */
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400877struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt)
Chuck Leverae729502017-10-20 10:48:12 -0400878{
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400879 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
Chuck Leverae729502017-10-20 10:48:12 -0400880 struct rpcrdma_sendctx *sc;
881 unsigned long next_head;
882
883 next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head);
884
885 if (next_head == READ_ONCE(buf->rb_sc_tail))
886 goto out_emptyq;
887
888 /* ORDER: item must be accessed _before_ head is updated */
889 sc = buf->rb_sc_ctxs[next_head];
890
891 /* Releasing the lock in the caller acts as a memory
892 * barrier that flushes rb_sc_head.
893 */
894 buf->rb_sc_head = next_head;
895
896 return sc;
897
898out_emptyq:
899 /* The queue is "empty" if there have not been enough Send
900 * completions recently. This is a sign the Send Queue is
901 * backing up. Cause the caller to pause and try again.
902 */
Chuck Lever05eb06d2019-06-19 10:32:48 -0400903 xprt_wait_for_buffer_space(&r_xprt->rx_xprt);
Chuck Leverae729502017-10-20 10:48:12 -0400904 r_xprt->rx_stats.empty_sendctx_q++;
905 return NULL;
906}
907
908/**
909 * rpcrdma_sendctx_put_locked - Release a send context
910 * @sc: send context to release
911 *
912 * Usage: Called from Send completion to return a sendctxt
913 * to the queue.
914 *
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400915 * The caller serializes calls to this function (per transport).
Chuck Leverae729502017-10-20 10:48:12 -0400916 */
Chuck Leverefd81e92018-05-04 15:35:41 -0400917static void
918rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc)
Chuck Leverae729502017-10-20 10:48:12 -0400919{
920 struct rpcrdma_buffer *buf = &sc->sc_xprt->rx_buf;
921 unsigned long next_tail;
922
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400923 /* Unmap SGEs of previously completed but unsignaled
Chuck Leverae729502017-10-20 10:48:12 -0400924 * Sends by walking up the queue until @sc is found.
925 */
926 next_tail = buf->rb_sc_tail;
927 do {
928 next_tail = rpcrdma_sendctx_next(buf, next_tail);
929
930 /* ORDER: item must be accessed _before_ tail is updated */
Chuck Leverdbcc53a2019-04-24 09:39:53 -0400931 rpcrdma_sendctx_unmap(buf->rb_sc_ctxs[next_tail]);
Chuck Leverae729502017-10-20 10:48:12 -0400932
933 } while (buf->rb_sc_ctxs[next_tail] != sc);
934
935 /* Paired with READ_ONCE */
936 smp_store_release(&buf->rb_sc_tail, next_tail);
Chuck Lever2fad6592018-05-04 15:35:57 -0400937
Chuck Lever05eb06d2019-06-19 10:32:48 -0400938 xprt_write_space(&sc->sc_xprt->rx_xprt);
Chuck Leverae729502017-10-20 10:48:12 -0400939}
940
Chuck Lever505bbe62016-06-29 13:52:54 -0400941static void
Chuck Lever96cedde2017-12-14 20:57:55 -0500942rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
Chuck Levere2ac2362016-06-29 13:54:00 -0400943{
944 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
945 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
946 unsigned int count;
Chuck Levere2ac2362016-06-29 13:54:00 -0400947
Chuck Leverc421ece2018-10-01 14:25:20 -0400948 for (count = 0; count < ia->ri_max_segs; count++) {
Chuck Lever96cedde2017-12-14 20:57:55 -0500949 struct rpcrdma_mr *mr;
Chuck Levere2ac2362016-06-29 13:54:00 -0400950 int rc;
951
Chuck Lever96cedde2017-12-14 20:57:55 -0500952 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
953 if (!mr)
Chuck Levere2ac2362016-06-29 13:54:00 -0400954 break;
955
Chuck Lever5f624122018-12-19 10:59:01 -0500956 rc = frwr_init_mr(ia, mr);
Chuck Levere2ac2362016-06-29 13:54:00 -0400957 if (rc) {
Chuck Lever96cedde2017-12-14 20:57:55 -0500958 kfree(mr);
Chuck Levere2ac2362016-06-29 13:54:00 -0400959 break;
960 }
961
Chuck Lever96cedde2017-12-14 20:57:55 -0500962 mr->mr_xprt = r_xprt;
Chuck Levere2ac2362016-06-29 13:54:00 -0400963
Chuck Levereed48a92019-08-19 18:42:31 -0400964 spin_lock(&buf->rb_mrlock);
965 list_add(&mr->mr_list, &buf->rb_mrs);
966 list_add(&mr->mr_all, &buf->rb_all_mrs);
967 spin_unlock(&buf->rb_mrlock);
Chuck Levere2ac2362016-06-29 13:54:00 -0400968 }
969
Chuck Levere2ac2362016-06-29 13:54:00 -0400970 r_xprt->rx_stats.mrs_allocated += count;
Chuck Lever1c443eff2017-12-20 16:31:21 -0500971 trace_xprtrdma_createmrs(r_xprt, count);
Chuck Levere2ac2362016-06-29 13:54:00 -0400972}
973
974static void
975rpcrdma_mr_refresh_worker(struct work_struct *work)
976{
977 struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
Chuck Lever3b39f522019-08-19 18:45:37 -0400978 rb_refresh_worker);
Chuck Levere2ac2362016-06-29 13:54:00 -0400979 struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
980 rx_buf);
981
Chuck Lever96cedde2017-12-14 20:57:55 -0500982 rpcrdma_mrs_create(r_xprt);
Chuck Lever05eb06d2019-06-19 10:32:48 -0400983 xprt_write_space(&r_xprt->rx_xprt);
Chuck Levere2ac2362016-06-29 13:54:00 -0400984}
985
Chuck Lever1769e6a2019-04-24 09:39:05 -0400986/**
987 * rpcrdma_req_create - Allocate an rpcrdma_req object
988 * @r_xprt: controlling r_xprt
Chuck Leverbb93a1a2019-04-24 09:39:21 -0400989 * @size: initial size, in bytes, of send and receive buffers
Chuck Lever1769e6a2019-04-24 09:39:05 -0400990 * @flags: GFP flags passed to memory allocators
991 *
992 * Returns an allocated and fully initialized rpcrdma_req or NULL.
993 */
Chuck Leverbb93a1a2019-04-24 09:39:21 -0400994struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
995 gfp_t flags)
Chuck Lever13924022015-01-21 11:03:52 -0500996{
Chuck Leverf531a5d2015-10-24 17:27:43 -0400997 struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
Chuck Lever2dd4a012018-02-28 15:31:05 -0500998 struct rpcrdma_regbuf *rb;
Chuck Lever13924022015-01-21 11:03:52 -0500999 struct rpcrdma_req *req;
Chuck Leverf3c66a22019-08-19 18:40:11 -04001000 size_t maxhdrsize;
Chuck Lever13924022015-01-21 11:03:52 -05001001
Chuck Lever1769e6a2019-04-24 09:39:05 -04001002 req = kzalloc(sizeof(*req), flags);
Chuck Lever13924022015-01-21 11:03:52 -05001003 if (req == NULL)
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001004 goto out1;
Chuck Lever13924022015-01-21 11:03:52 -05001005
Chuck Leverf3c66a22019-08-19 18:40:11 -04001006 /* Compute maximum header buffer size in bytes */
1007 maxhdrsize = rpcrdma_fixed_maxsz + 3 +
1008 r_xprt->rx_ia.ri_max_segs * rpcrdma_readchunk_maxsz;
1009 maxhdrsize *= sizeof(__be32);
1010 rb = rpcrdma_regbuf_alloc(__roundup_pow_of_two(maxhdrsize),
1011 DMA_TO_DEVICE, flags);
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001012 if (!rb)
1013 goto out2;
Chuck Lever2dd4a012018-02-28 15:31:05 -05001014 req->rl_rdmabuf = rb;
Chuck Lever8cec3db2019-04-24 09:39:16 -04001015 xdr_buf_init(&req->rl_hdrbuf, rdmab_data(rb), rdmab_length(rb));
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001016
Chuck Leverd2832af2019-04-24 09:39:32 -04001017 req->rl_sendbuf = rpcrdma_regbuf_alloc(size, DMA_TO_DEVICE, flags);
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001018 if (!req->rl_sendbuf)
1019 goto out3;
1020
Chuck Leverd2832af2019-04-24 09:39:32 -04001021 req->rl_recvbuf = rpcrdma_regbuf_alloc(size, DMA_NONE, flags);
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001022 if (!req->rl_recvbuf)
1023 goto out4;
1024
Chuck Lever2dd4a012018-02-28 15:31:05 -05001025 INIT_LIST_HEAD(&req->rl_registered);
Chuck Lever92f44332018-12-19 10:59:33 -05001026 spin_lock(&buffer->rb_lock);
Chuck Leverf531a5d2015-10-24 17:27:43 -04001027 list_add(&req->rl_all, &buffer->rb_allreqs);
Chuck Lever92f44332018-12-19 10:59:33 -05001028 spin_unlock(&buffer->rb_lock);
Chuck Lever13924022015-01-21 11:03:52 -05001029 return req;
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001030
1031out4:
1032 kfree(req->rl_sendbuf);
1033out3:
1034 kfree(req->rl_rdmabuf);
1035out2:
1036 kfree(req);
1037out1:
1038 return NULL;
Chuck Lever13924022015-01-21 11:03:52 -05001039}
1040
Chuck Lever379d1bc2019-06-19 10:33:20 -04001041static struct rpcrdma_rep *rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt,
1042 bool temp)
Chuck Lever13924022015-01-21 11:03:52 -05001043{
Chuck Lever13924022015-01-21 11:03:52 -05001044 struct rpcrdma_rep *rep;
Chuck Lever13924022015-01-21 11:03:52 -05001045
Chuck Lever6b1184c2015-01-21 11:04:25 -05001046 rep = kzalloc(sizeof(*rep), GFP_KERNEL);
Chuck Lever13924022015-01-21 11:03:52 -05001047 if (rep == NULL)
1048 goto out;
Chuck Lever13924022015-01-21 11:03:52 -05001049
Chuck Lever94087e92019-04-24 09:40:20 -04001050 rep->rr_rdmabuf = rpcrdma_regbuf_alloc(r_xprt->rx_ep.rep_inline_recv,
Chuck Lever99ef4db2016-09-15 10:56:10 -04001051 DMA_FROM_DEVICE, GFP_KERNEL);
Chuck Lever8cec3db2019-04-24 09:39:16 -04001052 if (!rep->rr_rdmabuf)
Chuck Lever13924022015-01-21 11:03:52 -05001053 goto out_free;
Chuck Lever379d1bc2019-06-19 10:33:20 -04001054
Chuck Lever8cec3db2019-04-24 09:39:16 -04001055 xdr_buf_init(&rep->rr_hdrbuf, rdmab_data(rep->rr_rdmabuf),
Chuck Lever96f87782017-08-03 14:30:03 -04001056 rdmab_length(rep->rr_rdmabuf));
Chuck Lever1519e962016-09-15 10:57:49 -04001057 rep->rr_cqe.done = rpcrdma_wc_receive;
Chuck Leverfed171b2015-05-26 11:51:37 -04001058 rep->rr_rxprt = r_xprt;
Chuck Lever6ea8e712016-09-15 10:56:51 -04001059 rep->rr_recv_wr.next = NULL;
1060 rep->rr_recv_wr.wr_cqe = &rep->rr_cqe;
1061 rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
1062 rep->rr_recv_wr.num_sge = 1;
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001063 rep->rr_temp = temp;
Chuck Lever379d1bc2019-06-19 10:33:20 -04001064 return rep;
Chuck Lever13924022015-01-21 11:03:52 -05001065
1066out_free:
1067 kfree(rep);
1068out:
Chuck Lever379d1bc2019-06-19 10:33:20 -04001069 return NULL;
Chuck Lever13924022015-01-21 11:03:52 -05001070}
1071
Chuck Lever86c4ccd2019-04-24 09:40:25 -04001072/**
1073 * rpcrdma_buffer_create - Create initial set of req/rep objects
1074 * @r_xprt: transport instance to (re)initialize
1075 *
1076 * Returns zero on success, otherwise a negative errno.
1077 */
1078int rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001079{
Chuck Leverac920d02015-01-21 11:03:44 -05001080 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001081 int i, rc;
1082
Chuck Lever86c4ccd2019-04-24 09:40:25 -04001083 buf->rb_max_requests = r_xprt->rx_ep.rep_max_requests;
Chuck Leverf531a5d2015-10-24 17:27:43 -04001084 buf->rb_bc_srv_max_requests = 0;
Chuck Lever96cedde2017-12-14 20:57:55 -05001085 spin_lock_init(&buf->rb_mrlock);
Chuck Lever505bbe62016-06-29 13:52:54 -04001086 spin_lock_init(&buf->rb_lock);
Chuck Lever96cedde2017-12-14 20:57:55 -05001087 INIT_LIST_HEAD(&buf->rb_mrs);
Chuck Levereed48a92019-08-19 18:42:31 -04001088 INIT_LIST_HEAD(&buf->rb_all_mrs);
Chuck Lever3b39f522019-08-19 18:45:37 -04001089 INIT_WORK(&buf->rb_refresh_worker, rpcrdma_mr_refresh_worker);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001090
Chuck Lever96cedde2017-12-14 20:57:55 -05001091 rpcrdma_mrs_create(r_xprt);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001092
Chuck Lever1e465fd2015-10-24 17:27:02 -04001093 INIT_LIST_HEAD(&buf->rb_send_bufs);
Chuck Leverf531a5d2015-10-24 17:27:43 -04001094 INIT_LIST_HEAD(&buf->rb_allreqs);
Chuck Lever1769e6a2019-04-24 09:39:05 -04001095
1096 rc = -ENOMEM;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001097 for (i = 0; i < buf->rb_max_requests; i++) {
1098 struct rpcrdma_req *req;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001099
Chuck Leverbb93a1a2019-04-24 09:39:21 -04001100 req = rpcrdma_req_create(r_xprt, RPCRDMA_V1_DEF_INLINE_SIZE,
1101 GFP_KERNEL);
Chuck Lever1769e6a2019-04-24 09:39:05 -04001102 if (!req)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001103 goto out;
Chuck Levera80d66c2017-06-08 11:52:12 -04001104 list_add(&req->rl_list, &buf->rb_send_bufs);
Chuck Lever1e465fd2015-10-24 17:27:02 -04001105 }
1106
Chuck Lever8d4fb8f2018-07-28 10:46:47 -04001107 buf->rb_credits = 1;
Chuck Lever1e465fd2015-10-24 17:27:02 -04001108 INIT_LIST_HEAD(&buf->rb_recv_bufs);
Chuck Lever13924022015-01-21 11:03:52 -05001109
Chuck Leverae729502017-10-20 10:48:12 -04001110 rc = rpcrdma_sendctxs_create(r_xprt);
1111 if (rc)
1112 goto out;
1113
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001114 return 0;
1115out:
1116 rpcrdma_buffer_destroy(buf);
1117 return rc;
1118}
1119
Chuck Lever23146502019-04-24 09:39:11 -04001120static void rpcrdma_rep_destroy(struct rpcrdma_rep *rep)
Chuck Lever13924022015-01-21 11:03:52 -05001121{
Chuck Leverd2832af2019-04-24 09:39:32 -04001122 rpcrdma_regbuf_free(rep->rr_rdmabuf);
Chuck Lever13924022015-01-21 11:03:52 -05001123 kfree(rep);
1124}
1125
Chuck Lever92f44332018-12-19 10:59:33 -05001126/**
1127 * rpcrdma_req_destroy - Destroy an rpcrdma_req object
1128 * @req: unused object to be destroyed
1129 *
1130 * This function assumes that the caller prevents concurrent device
1131 * unload and transport tear-down.
1132 */
Chuck Leverf531a5d2015-10-24 17:27:43 -04001133void
Chuck Lever92f44332018-12-19 10:59:33 -05001134rpcrdma_req_destroy(struct rpcrdma_req *req)
Chuck Lever13924022015-01-21 11:03:52 -05001135{
Chuck Lever92f44332018-12-19 10:59:33 -05001136 list_del(&req->rl_all);
1137
Chuck Leverd2832af2019-04-24 09:39:32 -04001138 rpcrdma_regbuf_free(req->rl_recvbuf);
1139 rpcrdma_regbuf_free(req->rl_sendbuf);
1140 rpcrdma_regbuf_free(req->rl_rdmabuf);
Chuck Lever13924022015-01-21 11:03:52 -05001141 kfree(req);
1142}
1143
Chuck Levere2ac2362016-06-29 13:54:00 -04001144static void
Chuck Lever96cedde2017-12-14 20:57:55 -05001145rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
Chuck Levere2ac2362016-06-29 13:54:00 -04001146{
1147 struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
1148 rx_buf);
Chuck Lever96cedde2017-12-14 20:57:55 -05001149 struct rpcrdma_mr *mr;
Chuck Levere2ac2362016-06-29 13:54:00 -04001150 unsigned int count;
1151
1152 count = 0;
Chuck Lever96cedde2017-12-14 20:57:55 -05001153 spin_lock(&buf->rb_mrlock);
Chuck Levereed48a92019-08-19 18:42:31 -04001154 while ((mr = list_first_entry_or_null(&buf->rb_all_mrs,
1155 struct rpcrdma_mr,
1156 mr_all)) != NULL) {
Chuck Lever96cedde2017-12-14 20:57:55 -05001157 list_del(&mr->mr_all);
Chuck Lever96cedde2017-12-14 20:57:55 -05001158 spin_unlock(&buf->rb_mrlock);
Chuck Lever054f1552018-05-01 11:37:14 -04001159
Chuck Lever5f624122018-12-19 10:59:01 -05001160 frwr_release_mr(mr);
Chuck Levere2ac2362016-06-29 13:54:00 -04001161 count++;
Chuck Lever96cedde2017-12-14 20:57:55 -05001162 spin_lock(&buf->rb_mrlock);
Chuck Levere2ac2362016-06-29 13:54:00 -04001163 }
Chuck Lever96cedde2017-12-14 20:57:55 -05001164 spin_unlock(&buf->rb_mrlock);
Chuck Levere2ac2362016-06-29 13:54:00 -04001165 r_xprt->rx_stats.mrs_allocated = 0;
Chuck Levere2ac2362016-06-29 13:54:00 -04001166}
1167
Chuck Leveraf65ed42018-12-19 11:00:37 -05001168/**
1169 * rpcrdma_buffer_destroy - Release all hw resources
1170 * @buf: root control block for resources
1171 *
Chuck Leverb8fe6772019-04-24 09:40:36 -04001172 * ORDERING: relies on a prior rpcrdma_xprt_drain :
Chuck Leveraf65ed42018-12-19 11:00:37 -05001173 * - No more Send or Receive completions can occur
1174 * - All MRs, reps, and reqs are returned to their free lists
1175 */
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001176void
1177rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
1178{
Chuck Lever3b39f522019-08-19 18:45:37 -04001179 cancel_work_sync(&buf->rb_refresh_worker);
Chuck Lever505bbe62016-06-29 13:52:54 -04001180
Chuck Leverae729502017-10-20 10:48:12 -04001181 rpcrdma_sendctxs_destroy(buf);
1182
Chuck Lever1e465fd2015-10-24 17:27:02 -04001183 while (!list_empty(&buf->rb_recv_bufs)) {
1184 struct rpcrdma_rep *rep;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001185
Chuck Lever9d95cd52018-05-04 15:35:36 -04001186 rep = list_first_entry(&buf->rb_recv_bufs,
1187 struct rpcrdma_rep, rr_list);
1188 list_del(&rep->rr_list);
Chuck Lever23146502019-04-24 09:39:11 -04001189 rpcrdma_rep_destroy(rep);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001190 }
1191
Chuck Lever92f44332018-12-19 10:59:33 -05001192 while (!list_empty(&buf->rb_send_bufs)) {
Chuck Lever1e465fd2015-10-24 17:27:02 -04001193 struct rpcrdma_req *req;
Allen Andrews4034ba02014-05-28 10:32:09 -04001194
Chuck Lever92f44332018-12-19 10:59:33 -05001195 req = list_first_entry(&buf->rb_send_bufs,
1196 struct rpcrdma_req, rl_list);
1197 list_del(&req->rl_list);
1198 rpcrdma_req_destroy(req);
Chuck Lever9f9d8022014-07-29 17:24:45 -04001199 }
1200
Chuck Lever96cedde2017-12-14 20:57:55 -05001201 rpcrdma_mrs_destroy(buf);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001202}
1203
Chuck Lever96cedde2017-12-14 20:57:55 -05001204/**
1205 * rpcrdma_mr_get - Allocate an rpcrdma_mr object
1206 * @r_xprt: controlling transport
1207 *
1208 * Returns an initialized rpcrdma_mr or NULL if no free
1209 * rpcrdma_mr objects are available.
1210 */
1211struct rpcrdma_mr *
1212rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt)
Chuck Leverc2922c02014-07-29 17:24:36 -04001213{
Chuck Lever346aa662015-05-26 11:52:06 -04001214 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
Chuck Lever265a38d2019-08-19 18:44:04 -04001215 struct rpcrdma_mr *mr;
Chuck Lever346aa662015-05-26 11:52:06 -04001216
Chuck Lever96cedde2017-12-14 20:57:55 -05001217 spin_lock(&buf->rb_mrlock);
Chuck Lever265a38d2019-08-19 18:44:04 -04001218 mr = rpcrdma_mr_pop(&buf->rb_mrs);
Chuck Lever96cedde2017-12-14 20:57:55 -05001219 spin_unlock(&buf->rb_mrlock);
Chuck Lever96cedde2017-12-14 20:57:55 -05001220 return mr;
Chuck Leverc2922c02014-07-29 17:24:36 -04001221}
1222
Chuck Lever96cedde2017-12-14 20:57:55 -05001223/**
Chuck Lever1ca3f4c2019-08-19 18:44:50 -04001224 * rpcrdma_mr_put - DMA unmap an MR and release it
1225 * @mr: MR to release
Chuck Lever96cedde2017-12-14 20:57:55 -05001226 *
1227 */
Chuck Lever1ca3f4c2019-08-19 18:44:50 -04001228void rpcrdma_mr_put(struct rpcrdma_mr *mr)
Chuck Leverec12e472017-12-14 20:58:04 -05001229{
1230 struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
Chuck Lever1ca3f4c2019-08-19 18:44:50 -04001231 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
Chuck Leverec12e472017-12-14 20:58:04 -05001232
Chuck Levere2f34e22018-12-19 10:58:13 -05001233 if (mr->mr_dir != DMA_NONE) {
1234 trace_xprtrdma_mr_unmap(mr);
Chuck Leverf19bd0b2019-04-24 09:40:04 -04001235 ib_dma_unmap_sg(r_xprt->rx_ia.ri_id->device,
Chuck Levere2f34e22018-12-19 10:58:13 -05001236 mr->mr_sg, mr->mr_nents, mr->mr_dir);
1237 mr->mr_dir = DMA_NONE;
1238 }
Chuck Lever1ca3f4c2019-08-19 18:44:50 -04001239
1240 spin_lock(&buf->rb_mrlock);
1241 rpcrdma_mr_push(mr, &buf->rb_mrs);
1242 spin_unlock(&buf->rb_mrlock);
Chuck Leverc2922c02014-07-29 17:24:36 -04001243}
1244
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001245/**
1246 * rpcrdma_buffer_get - Get a request buffer
1247 * @buffers: Buffer pool from which to obtain a buffer
Chuck Lever78d506e2016-09-06 11:22:49 -04001248 *
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001249 * Returns a fresh rpcrdma_req, or NULL if none are available.
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001250 */
1251struct rpcrdma_req *
1252rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
1253{
1254 struct rpcrdma_req *req;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001255
Chuck Levera5b027e2015-10-24 17:27:27 -04001256 spin_lock(&buffers->rb_lock);
Chuck Levere68699c2018-05-04 15:35:31 -04001257 req = list_first_entry_or_null(&buffers->rb_send_bufs,
1258 struct rpcrdma_req, rl_list);
1259 if (req)
1260 list_del_init(&req->rl_list);
Chuck Levera5b027e2015-10-24 17:27:27 -04001261 spin_unlock(&buffers->rb_lock);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001262 return req;
1263}
1264
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001265/**
1266 * rpcrdma_buffer_put - Put request/reply buffers back into pool
Chuck Lever5828ceb2019-06-19 10:33:36 -04001267 * @buffers: buffer pool
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001268 * @req: object to return
1269 *
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001270 */
Chuck Lever5828ceb2019-06-19 10:33:36 -04001271void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req)
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001272{
Chuck Lever1e465fd2015-10-24 17:27:02 -04001273 struct rpcrdma_rep *rep = req->rl_reply;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001274
Chuck Lever1e465fd2015-10-24 17:27:02 -04001275 req->rl_reply = NULL;
1276
Chuck Levera5b027e2015-10-24 17:27:27 -04001277 spin_lock(&buffers->rb_lock);
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001278 list_add(&req->rl_list, &buffers->rb_send_bufs);
Chuck Lever05c97462016-09-06 11:22:58 -04001279 if (rep) {
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001280 if (!rep->rr_temp) {
1281 list_add(&rep->rr_list, &buffers->rb_recv_bufs);
1282 rep = NULL;
1283 }
Chuck Lever05c97462016-09-06 11:22:58 -04001284 }
Chuck Levera5b027e2015-10-24 17:27:27 -04001285 spin_unlock(&buffers->rb_lock);
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001286 if (rep)
Chuck Lever23146502019-04-24 09:39:11 -04001287 rpcrdma_rep_destroy(rep);
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001288}
1289
1290/*
1291 * Put reply buffers back into pool when not attached to
Chuck Leverb45ccfd2014-05-28 10:32:34 -04001292 * request. This happens in error conditions.
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001293 */
1294void
1295rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
1296{
Chuck Leverfed171b2015-05-26 11:51:37 -04001297 struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001298
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001299 if (!rep->rr_temp) {
1300 spin_lock(&buffers->rb_lock);
1301 list_add(&rep->rr_list, &buffers->rb_recv_bufs);
1302 spin_unlock(&buffers->rb_lock);
1303 } else {
Chuck Lever23146502019-04-24 09:39:11 -04001304 rpcrdma_rep_destroy(rep);
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001305 }
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001306}
1307
Chuck Leverd2832af2019-04-24 09:39:32 -04001308/* Returns a pointer to a rpcrdma_regbuf object, or NULL.
Chuck Lever9128c3e2015-01-21 11:04:00 -05001309 *
1310 * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
Chuck Lever99ef4db2016-09-15 10:56:10 -04001311 * receiving the payload of RDMA RECV operations. During Long Calls
Chuck Lever5f624122018-12-19 10:59:01 -05001312 * or Replies they may be registered externally via frwr_map.
Chuck Lever9128c3e2015-01-21 11:04:00 -05001313 */
Chuck Leverd2832af2019-04-24 09:39:32 -04001314static struct rpcrdma_regbuf *
1315rpcrdma_regbuf_alloc(size_t size, enum dma_data_direction direction,
Chuck Lever13650c22016-09-15 10:56:26 -04001316 gfp_t flags)
Chuck Lever9128c3e2015-01-21 11:04:00 -05001317{
1318 struct rpcrdma_regbuf *rb;
Chuck Lever9128c3e2015-01-21 11:04:00 -05001319
Chuck Lever8cec3db2019-04-24 09:39:16 -04001320 rb = kmalloc(sizeof(*rb), flags);
1321 if (!rb)
1322 return NULL;
1323 rb->rg_data = kmalloc(size, flags);
1324 if (!rb->rg_data) {
1325 kfree(rb);
1326 return NULL;
1327 }
Chuck Lever9128c3e2015-01-21 11:04:00 -05001328
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001329 rb->rg_device = NULL;
Chuck Lever99ef4db2016-09-15 10:56:10 -04001330 rb->rg_direction = direction;
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001331 rb->rg_iov.length = size;
Chuck Lever9128c3e2015-01-21 11:04:00 -05001332 return rb;
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001333}
Chuck Lever9128c3e2015-01-21 11:04:00 -05001334
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001335/**
Chuck Lever0f665ce2019-04-24 09:39:27 -04001336 * rpcrdma_regbuf_realloc - re-allocate a SEND/RECV buffer
1337 * @rb: regbuf to reallocate
1338 * @size: size of buffer to be allocated, in bytes
1339 * @flags: GFP flags
1340 *
1341 * Returns true if reallocation was successful. If false is
1342 * returned, @rb is left untouched.
1343 */
1344bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, gfp_t flags)
1345{
1346 void *buf;
1347
1348 buf = kmalloc(size, flags);
1349 if (!buf)
1350 return false;
1351
Chuck Leverd2832af2019-04-24 09:39:32 -04001352 rpcrdma_regbuf_dma_unmap(rb);
Chuck Lever0f665ce2019-04-24 09:39:27 -04001353 kfree(rb->rg_data);
1354
1355 rb->rg_data = buf;
1356 rb->rg_iov.length = size;
1357 return true;
1358}
1359
1360/**
Chuck Leverd2832af2019-04-24 09:39:32 -04001361 * __rpcrdma_regbuf_dma_map - DMA-map a regbuf
1362 * @r_xprt: controlling transport instance
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001363 * @rb: regbuf to be mapped
Chuck Leverd2832af2019-04-24 09:39:32 -04001364 *
1365 * Returns true if the buffer is now DMA mapped to @r_xprt's device
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001366 */
Chuck Leverd2832af2019-04-24 09:39:32 -04001367bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
1368 struct rpcrdma_regbuf *rb)
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001369{
Chuck Leverf19bd0b2019-04-24 09:40:04 -04001370 struct ib_device *device = r_xprt->rx_ia.ri_id->device;
Chuck Lever91a10c52017-04-11 13:23:02 -04001371
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001372 if (rb->rg_direction == DMA_NONE)
1373 return false;
1374
Chuck Leverd2832af2019-04-24 09:39:32 -04001375 rb->rg_iov.addr = ib_dma_map_single(device, rdmab_data(rb),
1376 rdmab_length(rb), rb->rg_direction);
Chuck Lever53b2c1c2018-12-19 11:00:06 -05001377 if (ib_dma_mapping_error(device, rdmab_addr(rb))) {
1378 trace_xprtrdma_dma_maperr(rdmab_addr(rb));
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001379 return false;
Chuck Lever53b2c1c2018-12-19 11:00:06 -05001380 }
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001381
Chuck Lever91a10c52017-04-11 13:23:02 -04001382 rb->rg_device = device;
Chuck Leverd2832af2019-04-24 09:39:32 -04001383 rb->rg_iov.lkey = r_xprt->rx_ia.ri_pd->local_dma_lkey;
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001384 return true;
1385}
1386
Chuck Leverd2832af2019-04-24 09:39:32 -04001387static void rpcrdma_regbuf_dma_unmap(struct rpcrdma_regbuf *rb)
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001388{
Chuck Levere89e8d8f2018-01-31 12:34:13 -05001389 if (!rb)
1390 return;
1391
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001392 if (!rpcrdma_regbuf_is_mapped(rb))
1393 return;
1394
Chuck Leverd2832af2019-04-24 09:39:32 -04001395 ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb), rdmab_length(rb),
1396 rb->rg_direction);
Chuck Lever54cbd6b2016-09-15 10:56:18 -04001397 rb->rg_device = NULL;
Chuck Lever9128c3e2015-01-21 11:04:00 -05001398}
1399
Chuck Leverd2832af2019-04-24 09:39:32 -04001400static void rpcrdma_regbuf_free(struct rpcrdma_regbuf *rb)
Chuck Lever9128c3e2015-01-21 11:04:00 -05001401{
Chuck Leverd2832af2019-04-24 09:39:32 -04001402 rpcrdma_regbuf_dma_unmap(rb);
Chuck Lever8cec3db2019-04-24 09:39:16 -04001403 if (rb)
1404 kfree(rb->rg_data);
Chuck Levere531dca2015-08-03 13:03:20 -04001405 kfree(rb);
Chuck Lever9128c3e2015-01-21 11:04:00 -05001406}
1407
Chuck Lever995d3122018-12-19 11:00:32 -05001408/**
1409 * rpcrdma_ep_post - Post WRs to a transport's Send Queue
1410 * @ia: transport's device information
1411 * @ep: transport's RDMA endpoint information
1412 * @req: rpcrdma_req containing the Send WR to post
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001413 *
Chuck Lever995d3122018-12-19 11:00:32 -05001414 * Returns 0 if the post was successful, otherwise -ENOTCONN
1415 * is returned.
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001416 */
1417int
1418rpcrdma_ep_post(struct rpcrdma_ia *ia,
1419 struct rpcrdma_ep *ep,
1420 struct rpcrdma_req *req)
1421{
Chuck Leverae729502017-10-20 10:48:12 -04001422 struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr;
Chuck Lever655fec62016-09-15 10:57:24 -04001423 int rc;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001424
Chuck Lever0ab11522019-06-19 10:33:15 -04001425 if (!ep->rep_send_count || kref_read(&req->rl_kref) > 1) {
Chuck Leverae729502017-10-20 10:48:12 -04001426 send_wr->send_flags |= IB_SEND_SIGNALED;
1427 ep->rep_send_count = ep->rep_send_batch;
1428 } else {
1429 send_wr->send_flags &= ~IB_SEND_SIGNALED;
1430 --ep->rep_send_count;
1431 }
Chuck Lever7a89f9c2016-06-29 13:53:43 -04001432
Chuck Lever5f624122018-12-19 10:59:01 -05001433 rc = frwr_send(ia, req);
Chuck Leverab03eff2017-12-20 16:30:40 -05001434 trace_xprtrdma_post_send(req, rc);
1435 if (rc)
1436 return -ENOTCONN;
1437 return 0;
\"Talpey, Thomas\c56c65f2007-09-10 13:51:18 -04001438}
1439
Chuck Lever6ceea362018-12-19 10:58:24 -05001440static void
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001441rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
Chuck Leverf531a5d2015-10-24 17:27:43 -04001442{
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001443 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
Chuck Lever6ceea362018-12-19 10:58:24 -05001444 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001445 struct ib_recv_wr *i, *wr, *bad_wr;
1446 struct rpcrdma_rep *rep;
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001447 int needed, count, rc;
Chuck Leverf531a5d2015-10-24 17:27:43 -04001448
Chuck Lever61c208a2018-10-01 14:26:35 -04001449 rc = 0;
1450 count = 0;
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001451
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001452 needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1);
Chuck Lever6ceea362018-12-19 10:58:24 -05001453 if (ep->rep_receive_count > needed)
Chuck Lever61c208a2018-10-01 14:26:35 -04001454 goto out;
Chuck Lever6ceea362018-12-19 10:58:24 -05001455 needed -= ep->rep_receive_count;
Chuck Levere340c2d2019-02-11 11:23:54 -05001456 if (!temp)
1457 needed += RPCRDMA_MAX_RECV_BATCH;
Chuck Leverf531a5d2015-10-24 17:27:43 -04001458
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001459 /* fast path: all needed reps can be found on the free list */
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001460 wr = NULL;
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001461 spin_lock(&buf->rb_lock);
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001462 while (needed) {
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001463 rep = list_first_entry_or_null(&buf->rb_recv_bufs,
1464 struct rpcrdma_rep, rr_list);
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001465 if (!rep)
Chuck Leverd2832af2019-04-24 09:39:32 -04001466 break;
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001467
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001468 list_del(&rep->rr_list);
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001469 rep->rr_recv_wr.next = wr;
1470 wr = &rep->rr_recv_wr;
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001471 --needed;
Chuck Leverf531a5d2015-10-24 17:27:43 -04001472 }
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001473 spin_unlock(&buf->rb_lock);
1474
1475 while (needed) {
1476 rep = rpcrdma_rep_create(r_xprt, temp);
1477 if (!rep)
1478 break;
1479
1480 rep->rr_recv_wr.next = wr;
1481 wr = &rep->rr_recv_wr;
1482 --needed;
1483 }
1484 if (!wr)
Chuck Lever61c208a2018-10-01 14:26:35 -04001485 goto out;
Chuck Leverf531a5d2015-10-24 17:27:43 -04001486
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001487 for (i = wr; i; i = i->next) {
1488 rep = container_of(i, struct rpcrdma_rep, rr_recv_wr);
1489
1490 if (!rpcrdma_regbuf_dma_map(r_xprt, rep->rr_rdmabuf))
1491 goto release_wrs;
1492
Chuck Lever2dfdcd82019-08-19 18:41:44 -04001493 trace_xprtrdma_post_recv(rep);
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001494 ++count;
1495 }
1496
Bart Van Assched34ac5c2018-07-18 09:25:32 -07001497 rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr,
1498 (const struct ib_recv_wr **)&bad_wr);
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001499out:
1500 trace_xprtrdma_post_recvs(r_xprt, count, rc);
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001501 if (rc) {
Chuck Lever2d0abe32019-06-19 10:32:38 -04001502 for (wr = bad_wr; wr;) {
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001503 struct rpcrdma_rep *rep;
Chuck Leverf531a5d2015-10-24 17:27:43 -04001504
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001505 rep = container_of(wr, struct rpcrdma_rep, rr_recv_wr);
Chuck Lever2d0abe32019-06-19 10:32:38 -04001506 wr = wr->next;
Chuck Lever7c8d9e72018-05-04 15:35:20 -04001507 rpcrdma_recv_buffer_put(rep);
1508 --count;
1509 }
1510 }
Chuck Lever6ceea362018-12-19 10:58:24 -05001511 ep->rep_receive_count += count;
Chuck Lever9ef33ef2019-06-19 10:33:26 -04001512 return;
1513
1514release_wrs:
1515 for (i = wr; i;) {
1516 rep = container_of(i, struct rpcrdma_rep, rr_recv_wr);
1517 i = i->next;
1518 rpcrdma_recv_buffer_put(rep);
1519 }
Chuck Leverf531a5d2015-10-24 17:27:43 -04001520}