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/fs.h>
44 #include <linux/sysctl.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/sunrpc/sched.h>
47 #include <linux/sunrpc/svc_rdma.h>
48
49 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
50
51 /* RPC/RDMA parameters */
52 unsigned int svcrdma_ord = RPCRDMA_ORD;
53 static unsigned int min_ord = 1;
54 static unsigned int max_ord = 4096;
55 unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
56 static unsigned int min_max_requests = 4;
57 static unsigned int max_max_requests = 16384;
58 unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
59 static unsigned int min_max_inline = 4096;
60 static unsigned int max_max_inline = 65536;
61
62 atomic_t rdma_stat_recv;
63 atomic_t rdma_stat_read;
64 atomic_t rdma_stat_write;
65 atomic_t rdma_stat_sq_starve;
66 atomic_t rdma_stat_rq_starve;
67 atomic_t rdma_stat_rq_poll;
68 atomic_t rdma_stat_rq_prod;
69 atomic_t rdma_stat_sq_poll;
70 atomic_t rdma_stat_sq_prod;
71
72 /* Temporary NFS request map and context caches */
73 struct kmem_cache *svc_rdma_map_cachep;
74 struct kmem_cache *svc_rdma_ctxt_cachep;
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 */
82 static int read_reset_stat(ctl_table *table, int write,
83 struct file *filp, 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 char *data;
96 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
97 if (len >= 32)
98 return -EFAULT;
99 len = strlen(str_buf);
100 if (*ppos > len) {
101 *lenp = 0;
102 return 0;
103 }
104 data = &str_buf[*ppos];
105 len -= *ppos;
106 if (len > *lenp)
107 len = *lenp;
108 if (len && copy_to_user(buffer, str_buf, len))
109 return -EFAULT;
110 *lenp = len;
111 *ppos += len;
112 }
113 return 0;
114 }
115
116 static struct ctl_table_header *svcrdma_table_header;
117 static ctl_table svcrdma_parm_table[] = {
118 {
119 .procname = "max_requests",
120 .data = &svcrdma_max_requests,
121 .maxlen = sizeof(unsigned int),
122 .mode = 0644,
123 .proc_handler = &proc_dointvec_minmax,
124 .strategy = &sysctl_intvec,
125 .extra1 = &min_max_requests,
126 .extra2 = &max_max_requests
127 },
128 {
129 .procname = "max_req_size",
130 .data = &svcrdma_max_req_size,
131 .maxlen = sizeof(unsigned int),
132 .mode = 0644,
133 .proc_handler = &proc_dointvec_minmax,
134 .strategy = &sysctl_intvec,
135 .extra1 = &min_max_inline,
136 .extra2 = &max_max_inline
137 },
138 {
139 .procname = "max_outbound_read_requests",
140 .data = &svcrdma_ord,
141 .maxlen = sizeof(unsigned int),
142 .mode = 0644,
143 .proc_handler = &proc_dointvec_minmax,
144 .strategy = &sysctl_intvec,
145 .extra1 = &min_ord,
146 .extra2 = &max_ord,
147 },
148
149 {
150 .procname = "rdma_stat_read",
151 .data = &rdma_stat_read,
152 .maxlen = sizeof(atomic_t),
153 .mode = 0644,
154 .proc_handler = &read_reset_stat,
155 },
156 {
157 .procname = "rdma_stat_recv",
158 .data = &rdma_stat_recv,
159 .maxlen = sizeof(atomic_t),
160 .mode = 0644,
161 .proc_handler = &read_reset_stat,
162 },
163 {
164 .procname = "rdma_stat_write",
165 .data = &rdma_stat_write,
166 .maxlen = sizeof(atomic_t),
167 .mode = 0644,
168 .proc_handler = &read_reset_stat,
169 },
170 {
171 .procname = "rdma_stat_sq_starve",
172 .data = &rdma_stat_sq_starve,
173 .maxlen = sizeof(atomic_t),
174 .mode = 0644,
175 .proc_handler = &read_reset_stat,
176 },
177 {
178 .procname = "rdma_stat_rq_starve",
179 .data = &rdma_stat_rq_starve,
180 .maxlen = sizeof(atomic_t),
181 .mode = 0644,
182 .proc_handler = &read_reset_stat,
183 },
184 {
185 .procname = "rdma_stat_rq_poll",
186 .data = &rdma_stat_rq_poll,
187 .maxlen = sizeof(atomic_t),
188 .mode = 0644,
189 .proc_handler = &read_reset_stat,
190 },
191 {
192 .procname = "rdma_stat_rq_prod",
193 .data = &rdma_stat_rq_prod,
194 .maxlen = sizeof(atomic_t),
195 .mode = 0644,
196 .proc_handler = &read_reset_stat,
197 },
198 {
199 .procname = "rdma_stat_sq_poll",
200 .data = &rdma_stat_sq_poll,
201 .maxlen = sizeof(atomic_t),
202 .mode = 0644,
203 .proc_handler = &read_reset_stat,
204 },
205 {
206 .procname = "rdma_stat_sq_prod",
207 .data = &rdma_stat_sq_prod,
208 .maxlen = sizeof(atomic_t),
209 .mode = 0644,
210 .proc_handler = &read_reset_stat,
211 },
212 {
213 .ctl_name = 0,
214 },
215 };
216
217 static ctl_table svcrdma_table[] = {
218 {
219 .procname = "svc_rdma",
220 .mode = 0555,
221 .child = svcrdma_parm_table
222 },
223 {
224 .ctl_name = 0,
225 },
226 };
227
228 static ctl_table svcrdma_root_table[] = {
229 {
230 .ctl_name = CTL_SUNRPC,
231 .procname = "sunrpc",
232 .mode = 0555,
233 .child = svcrdma_table
234 },
235 {
236 .ctl_name = 0,
237 },
238 };
239
240 void svc_rdma_cleanup(void)
241 {
242 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
243 flush_scheduled_work();
244 if (svcrdma_table_header) {
245 unregister_sysctl_table(svcrdma_table_header);
246 svcrdma_table_header = NULL;
247 }
248 svc_unreg_xprt_class(&svc_rdma_class);
249 kmem_cache_destroy(svc_rdma_map_cachep);
250 kmem_cache_destroy(svc_rdma_ctxt_cachep);
251 }
252
253 int svc_rdma_init(void)
254 {
255 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
256 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
257 dprintk("\tmax_requests : %d\n", svcrdma_max_requests);
258 dprintk("\tsq_depth : %d\n",
259 svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
260 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
261 if (!svcrdma_table_header)
262 svcrdma_table_header =
263 register_sysctl_table(svcrdma_root_table);
264
265 /* Create the temporary map cache */
266 svc_rdma_map_cachep = kmem_cache_create("svc_rdma_map_cache",
267 sizeof(struct svc_rdma_req_map),
268 0,
269 SLAB_HWCACHE_ALIGN,
270 NULL);
271 if (!svc_rdma_map_cachep) {
272 printk(KERN_INFO "Could not allocate map cache.\n");
273 goto err0;
274 }
275
276 /* Create the temporary context cache */
277 svc_rdma_ctxt_cachep =
278 kmem_cache_create("svc_rdma_ctxt_cache",
279 sizeof(struct svc_rdma_op_ctxt),
280 0,
281 SLAB_HWCACHE_ALIGN,
282 NULL);
283 if (!svc_rdma_ctxt_cachep) {
284 printk(KERN_INFO "Could not allocate WR ctxt cache.\n");
285 goto err1;
286 }
287
288 /* Register RDMA with the SVC transport switch */
289 svc_reg_xprt_class(&svc_rdma_class);
290 return 0;
291 err1:
292 kmem_cache_destroy(svc_rdma_map_cachep);
293 err0:
294 unregister_sysctl_table(svcrdma_table_header);
295 return -ENOMEM;
296 }
297 MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
298 MODULE_DESCRIPTION("SVC RDMA Transport");
299 MODULE_LICENSE("Dual BSD/GPL");
300 module_init(svc_rdma_init);
301 module_exit(svc_rdma_cleanup);
302
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