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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright (c) 2015-2018 Oracle. All rights reserved.
4 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the BSD-type
10 * license below:
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * Neither the name of the Network Appliance, Inc. nor the names of
25 * its contributors may be used to endorse or promote products
26 * derived from this software without specific prior written
27 * permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Author: Tom Tucker <tom@opengridcomputing.com>
42 */
43
44#include <linux/slab.h>
45#include <linux/fs.h>
46#include <linux/sysctl.h>
47#include <linux/workqueue.h>
48#include <linux/sunrpc/clnt.h>
49#include <linux/sunrpc/sched.h>
50#include <linux/sunrpc/svc_rdma.h>
51
52#define RPCDBG_FACILITY RPCDBG_SVCXPRT
53
54/* RPC/RDMA parameters */
55unsigned int svcrdma_ord = 16; /* historical default */
56static unsigned int min_ord = 1;
57static unsigned int max_ord = 255;
58unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
59unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
60static unsigned int min_max_requests = 4;
61static unsigned int max_max_requests = 16384;
62unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
63static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
64static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
65
66atomic_t rdma_stat_recv;
67atomic_t rdma_stat_read;
68atomic_t rdma_stat_write;
69atomic_t rdma_stat_sq_starve;
70atomic_t rdma_stat_rq_starve;
71atomic_t rdma_stat_rq_poll;
72atomic_t rdma_stat_rq_prod;
73atomic_t rdma_stat_sq_poll;
74atomic_t rdma_stat_sq_prod;
75
76/*
77 * This function implements reading and resetting an atomic_t stat
78 * variable through read/write to a proc file. Any write to the file
79 * resets the associated statistic to zero. Any read returns it's
80 * current value.
81 */
82static int read_reset_stat(struct ctl_table *table, int write,
83 void __user *buffer, size_t *lenp,
84 loff_t *ppos)
85{
86 atomic_t *stat = (atomic_t *)table->data;
87
88 if (!stat)
89 return -EINVAL;
90
91 if (write)
92 atomic_set(stat, 0);
93 else {
94 char str_buf[32];
95 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
96 if (len >= 32)
97 return -EFAULT;
98 len = strlen(str_buf);
99 if (*ppos > len) {
100 *lenp = 0;
101 return 0;
102 }
103 len -= *ppos;
104 if (len > *lenp)
105 len = *lenp;
106 if (len && copy_to_user(buffer, str_buf, len))
107 return -EFAULT;
108 *lenp = len;
109 *ppos += len;
110 }
111 return 0;
112}
113
114static struct ctl_table_header *svcrdma_table_header;
115static struct ctl_table svcrdma_parm_table[] = {
116 {
117 .procname = "max_requests",
118 .data = &svcrdma_max_requests,
119 .maxlen = sizeof(unsigned int),
120 .mode = 0644,
121 .proc_handler = proc_dointvec_minmax,
122 .extra1 = &min_max_requests,
123 .extra2 = &max_max_requests
124 },
125 {
126 .procname = "max_req_size",
127 .data = &svcrdma_max_req_size,
128 .maxlen = sizeof(unsigned int),
129 .mode = 0644,
130 .proc_handler = proc_dointvec_minmax,
131 .extra1 = &min_max_inline,
132 .extra2 = &max_max_inline
133 },
134 {
135 .procname = "max_outbound_read_requests",
136 .data = &svcrdma_ord,
137 .maxlen = sizeof(unsigned int),
138 .mode = 0644,
139 .proc_handler = proc_dointvec_minmax,
140 .extra1 = &min_ord,
141 .extra2 = &max_ord,
142 },
143
144 {
145 .procname = "rdma_stat_read",
146 .data = &rdma_stat_read,
147 .maxlen = sizeof(atomic_t),
148 .mode = 0644,
149 .proc_handler = read_reset_stat,
150 },
151 {
152 .procname = "rdma_stat_recv",
153 .data = &rdma_stat_recv,
154 .maxlen = sizeof(atomic_t),
155 .mode = 0644,
156 .proc_handler = read_reset_stat,
157 },
158 {
159 .procname = "rdma_stat_write",
160 .data = &rdma_stat_write,
161 .maxlen = sizeof(atomic_t),
162 .mode = 0644,
163 .proc_handler = read_reset_stat,
164 },
165 {
166 .procname = "rdma_stat_sq_starve",
167 .data = &rdma_stat_sq_starve,
168 .maxlen = sizeof(atomic_t),
169 .mode = 0644,
170 .proc_handler = read_reset_stat,
171 },
172 {
173 .procname = "rdma_stat_rq_starve",
174 .data = &rdma_stat_rq_starve,
175 .maxlen = sizeof(atomic_t),
176 .mode = 0644,
177 .proc_handler = read_reset_stat,
178 },
179 {
180 .procname = "rdma_stat_rq_poll",
181 .data = &rdma_stat_rq_poll,
182 .maxlen = sizeof(atomic_t),
183 .mode = 0644,
184 .proc_handler = read_reset_stat,
185 },
186 {
187 .procname = "rdma_stat_rq_prod",
188 .data = &rdma_stat_rq_prod,
189 .maxlen = sizeof(atomic_t),
190 .mode = 0644,
191 .proc_handler = read_reset_stat,
192 },
193 {
194 .procname = "rdma_stat_sq_poll",
195 .data = &rdma_stat_sq_poll,
196 .maxlen = sizeof(atomic_t),
197 .mode = 0644,
198 .proc_handler = read_reset_stat,
199 },
200 {
201 .procname = "rdma_stat_sq_prod",
202 .data = &rdma_stat_sq_prod,
203 .maxlen = sizeof(atomic_t),
204 .mode = 0644,
205 .proc_handler = read_reset_stat,
206 },
207 { },
208};
209
210static struct ctl_table svcrdma_table[] = {
211 {
212 .procname = "svc_rdma",
213 .mode = 0555,
214 .child = svcrdma_parm_table
215 },
216 { },
217};
218
219static struct ctl_table svcrdma_root_table[] = {
220 {
221 .procname = "sunrpc",
222 .mode = 0555,
223 .child = svcrdma_table
224 },
225 { },
226};
227
228void svc_rdma_cleanup(void)
229{
230 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
231 if (svcrdma_table_header) {
232 unregister_sysctl_table(svcrdma_table_header);
233 svcrdma_table_header = NULL;
234 }
235 svc_unreg_xprt_class(&svc_rdma_class);
236}
237
238int svc_rdma_init(void)
239{
240 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
241 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
242 dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
243 dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
244 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
245
246 if (!svcrdma_table_header)
247 svcrdma_table_header =
248 register_sysctl_table(svcrdma_root_table);
249
250 /* Register RDMA with the SVC transport switch */
251 svc_reg_xprt_class(&svc_rdma_class);
252 return 0;
253}
1/*
2 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
8 * license below:
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 *
17 * Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
21 *
22 * Neither the name of the Network Appliance, Inc. nor the names of
23 * its contributors may be used to endorse or promote products
24 * derived from this software without specific prior written
25 * permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 *
39 * Author: Tom Tucker <tom@opengridcomputing.com>
40 */
41#include <linux/module.h>
42#include <linux/init.h>
43#include <linux/slab.h>
44#include <linux/fs.h>
45#include <linux/sysctl.h>
46#include <linux/workqueue.h>
47#include <linux/sunrpc/clnt.h>
48#include <linux/sunrpc/sched.h>
49#include <linux/sunrpc/svc_rdma.h>
50
51#define RPCDBG_FACILITY RPCDBG_SVCXPRT
52
53/* RPC/RDMA parameters */
54unsigned int svcrdma_ord = RPCRDMA_ORD;
55static unsigned int min_ord = 1;
56static unsigned int max_ord = 4096;
57unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
58static unsigned int min_max_requests = 4;
59static unsigned int max_max_requests = 16384;
60unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
61static unsigned int min_max_inline = 4096;
62static unsigned int max_max_inline = 65536;
63
64atomic_t rdma_stat_recv;
65atomic_t rdma_stat_read;
66atomic_t rdma_stat_write;
67atomic_t rdma_stat_sq_starve;
68atomic_t rdma_stat_rq_starve;
69atomic_t rdma_stat_rq_poll;
70atomic_t rdma_stat_rq_prod;
71atomic_t rdma_stat_sq_poll;
72atomic_t rdma_stat_sq_prod;
73
74/* Temporary NFS request map and context caches */
75struct kmem_cache *svc_rdma_map_cachep;
76struct kmem_cache *svc_rdma_ctxt_cachep;
77
78struct workqueue_struct *svc_rdma_wq;
79
80/*
81 * This function implements reading and resetting an atomic_t stat
82 * variable through read/write to a proc file. Any write to the file
83 * resets the associated statistic to zero. Any read returns it's
84 * current value.
85 */
86static int read_reset_stat(ctl_table *table, int write,
87 void __user *buffer, size_t *lenp,
88 loff_t *ppos)
89{
90 atomic_t *stat = (atomic_t *)table->data;
91
92 if (!stat)
93 return -EINVAL;
94
95 if (write)
96 atomic_set(stat, 0);
97 else {
98 char str_buf[32];
99 char *data;
100 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
101 if (len >= 32)
102 return -EFAULT;
103 len = strlen(str_buf);
104 if (*ppos > len) {
105 *lenp = 0;
106 return 0;
107 }
108 data = &str_buf[*ppos];
109 len -= *ppos;
110 if (len > *lenp)
111 len = *lenp;
112 if (len && copy_to_user(buffer, str_buf, len))
113 return -EFAULT;
114 *lenp = len;
115 *ppos += len;
116 }
117 return 0;
118}
119
120static struct ctl_table_header *svcrdma_table_header;
121static ctl_table svcrdma_parm_table[] = {
122 {
123 .procname = "max_requests",
124 .data = &svcrdma_max_requests,
125 .maxlen = sizeof(unsigned int),
126 .mode = 0644,
127 .proc_handler = proc_dointvec_minmax,
128 .extra1 = &min_max_requests,
129 .extra2 = &max_max_requests
130 },
131 {
132 .procname = "max_req_size",
133 .data = &svcrdma_max_req_size,
134 .maxlen = sizeof(unsigned int),
135 .mode = 0644,
136 .proc_handler = proc_dointvec_minmax,
137 .extra1 = &min_max_inline,
138 .extra2 = &max_max_inline
139 },
140 {
141 .procname = "max_outbound_read_requests",
142 .data = &svcrdma_ord,
143 .maxlen = sizeof(unsigned int),
144 .mode = 0644,
145 .proc_handler = proc_dointvec_minmax,
146 .extra1 = &min_ord,
147 .extra2 = &max_ord,
148 },
149
150 {
151 .procname = "rdma_stat_read",
152 .data = &rdma_stat_read,
153 .maxlen = sizeof(atomic_t),
154 .mode = 0644,
155 .proc_handler = read_reset_stat,
156 },
157 {
158 .procname = "rdma_stat_recv",
159 .data = &rdma_stat_recv,
160 .maxlen = sizeof(atomic_t),
161 .mode = 0644,
162 .proc_handler = read_reset_stat,
163 },
164 {
165 .procname = "rdma_stat_write",
166 .data = &rdma_stat_write,
167 .maxlen = sizeof(atomic_t),
168 .mode = 0644,
169 .proc_handler = read_reset_stat,
170 },
171 {
172 .procname = "rdma_stat_sq_starve",
173 .data = &rdma_stat_sq_starve,
174 .maxlen = sizeof(atomic_t),
175 .mode = 0644,
176 .proc_handler = read_reset_stat,
177 },
178 {
179 .procname = "rdma_stat_rq_starve",
180 .data = &rdma_stat_rq_starve,
181 .maxlen = sizeof(atomic_t),
182 .mode = 0644,
183 .proc_handler = read_reset_stat,
184 },
185 {
186 .procname = "rdma_stat_rq_poll",
187 .data = &rdma_stat_rq_poll,
188 .maxlen = sizeof(atomic_t),
189 .mode = 0644,
190 .proc_handler = read_reset_stat,
191 },
192 {
193 .procname = "rdma_stat_rq_prod",
194 .data = &rdma_stat_rq_prod,
195 .maxlen = sizeof(atomic_t),
196 .mode = 0644,
197 .proc_handler = read_reset_stat,
198 },
199 {
200 .procname = "rdma_stat_sq_poll",
201 .data = &rdma_stat_sq_poll,
202 .maxlen = sizeof(atomic_t),
203 .mode = 0644,
204 .proc_handler = read_reset_stat,
205 },
206 {
207 .procname = "rdma_stat_sq_prod",
208 .data = &rdma_stat_sq_prod,
209 .maxlen = sizeof(atomic_t),
210 .mode = 0644,
211 .proc_handler = read_reset_stat,
212 },
213 { },
214};
215
216static ctl_table svcrdma_table[] = {
217 {
218 .procname = "svc_rdma",
219 .mode = 0555,
220 .child = svcrdma_parm_table
221 },
222 { },
223};
224
225static ctl_table svcrdma_root_table[] = {
226 {
227 .procname = "sunrpc",
228 .mode = 0555,
229 .child = svcrdma_table
230 },
231 { },
232};
233
234void svc_rdma_cleanup(void)
235{
236 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
237 destroy_workqueue(svc_rdma_wq);
238 if (svcrdma_table_header) {
239 unregister_sysctl_table(svcrdma_table_header);
240 svcrdma_table_header = NULL;
241 }
242 svc_unreg_xprt_class(&svc_rdma_class);
243 kmem_cache_destroy(svc_rdma_map_cachep);
244 kmem_cache_destroy(svc_rdma_ctxt_cachep);
245}
246
247int svc_rdma_init(void)
248{
249 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
250 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
251 dprintk("\tmax_requests : %d\n", svcrdma_max_requests);
252 dprintk("\tsq_depth : %d\n",
253 svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
254 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
255
256 svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
257 if (!svc_rdma_wq)
258 return -ENOMEM;
259
260 if (!svcrdma_table_header)
261 svcrdma_table_header =
262 register_sysctl_table(svcrdma_root_table);
263
264 /* Create the temporary map cache */
265 svc_rdma_map_cachep = kmem_cache_create("svc_rdma_map_cache",
266 sizeof(struct svc_rdma_req_map),
267 0,
268 SLAB_HWCACHE_ALIGN,
269 NULL);
270 if (!svc_rdma_map_cachep) {
271 printk(KERN_INFO "Could not allocate map cache.\n");
272 goto err0;
273 }
274
275 /* Create the temporary context cache */
276 svc_rdma_ctxt_cachep =
277 kmem_cache_create("svc_rdma_ctxt_cache",
278 sizeof(struct svc_rdma_op_ctxt),
279 0,
280 SLAB_HWCACHE_ALIGN,
281 NULL);
282 if (!svc_rdma_ctxt_cachep) {
283 printk(KERN_INFO "Could not allocate WR ctxt cache.\n");
284 goto err1;
285 }
286
287 /* Register RDMA with the SVC transport switch */
288 svc_reg_xprt_class(&svc_rdma_class);
289 return 0;
290 err1:
291 kmem_cache_destroy(svc_rdma_map_cachep);
292 err0:
293 unregister_sysctl_table(svcrdma_table_header);
294 destroy_workqueue(svc_rdma_wq);
295 return -ENOMEM;
296}
297MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
298MODULE_DESCRIPTION("SVC RDMA Transport");
299MODULE_LICENSE("Dual BSD/GPL");
300module_init(svc_rdma_init);
301module_exit(svc_rdma_cleanup);