Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[linux-2.6-block.git] / net / sunrpc / xprtrdma / svc_rdma.c
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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 */
ffe1f0df 41
5a0e3ad6 42#include <linux/slab.h>
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43#include <linux/fs.h>
44#include <linux/sysctl.h>
a25e758c 45#include <linux/workqueue.h>
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46#include <linux/sunrpc/clnt.h>
47#include <linux/sunrpc/sched.h>
48#include <linux/sunrpc/svc_rdma.h>
cec56c8f 49#include "xprt_rdma.h"
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50
51#define RPCDBG_FACILITY RPCDBG_SVCXPRT
52
53/* RPC/RDMA parameters */
97cc3264 54unsigned int svcrdma_ord = 16; /* historical default */
ef7fbf59 55static unsigned int min_ord = 1;
97cc3264 56static unsigned int max_ord = 255;
ef7fbf59 57unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
03fe9931 58unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
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59static unsigned int min_max_requests = 4;
60static unsigned int max_max_requests = 16384;
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61unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
62static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
63static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
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64
65atomic_t rdma_stat_recv;
66atomic_t rdma_stat_read;
67atomic_t rdma_stat_write;
68atomic_t rdma_stat_sq_starve;
69atomic_t rdma_stat_rq_starve;
70atomic_t rdma_stat_rq_poll;
71atomic_t rdma_stat_rq_prod;
72atomic_t rdma_stat_sq_poll;
73atomic_t rdma_stat_sq_prod;
74
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75struct workqueue_struct *svc_rdma_wq;
76
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77/*
78 * This function implements reading and resetting an atomic_t stat
79 * variable through read/write to a proc file. Any write to the file
80 * resets the associated statistic to zero. Any read returns it's
81 * current value.
82 */
fe2c6338 83static int read_reset_stat(struct ctl_table *table, int write,
8d65af78 84 void __user *buffer, size_t *lenp,
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85 loff_t *ppos)
86{
87 atomic_t *stat = (atomic_t *)table->data;
88
89 if (!stat)
90 return -EINVAL;
91
92 if (write)
93 atomic_set(stat, 0);
94 else {
95 char str_buf[32];
96 char *data;
97 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
98 if (len >= 32)
99 return -EFAULT;
100 len = strlen(str_buf);
101 if (*ppos > len) {
102 *lenp = 0;
103 return 0;
104 }
105 data = &str_buf[*ppos];
106 len -= *ppos;
107 if (len > *lenp)
108 len = *lenp;
109 if (len && copy_to_user(buffer, str_buf, len))
110 return -EFAULT;
111 *lenp = len;
112 *ppos += len;
113 }
114 return 0;
115}
116
117static struct ctl_table_header *svcrdma_table_header;
fe2c6338 118static struct ctl_table svcrdma_parm_table[] = {
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119 {
120 .procname = "max_requests",
121 .data = &svcrdma_max_requests,
122 .maxlen = sizeof(unsigned int),
123 .mode = 0644,
6d456111 124 .proc_handler = proc_dointvec_minmax,
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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,
6d456111 133 .proc_handler = proc_dointvec_minmax,
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134 .extra1 = &min_max_inline,
135 .extra2 = &max_max_inline
136 },
137 {
138 .procname = "max_outbound_read_requests",
139 .data = &svcrdma_ord,
140 .maxlen = sizeof(unsigned int),
141 .mode = 0644,
6d456111 142 .proc_handler = proc_dointvec_minmax,
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143 .extra1 = &min_ord,
144 .extra2 = &max_ord,
145 },
146
147 {
148 .procname = "rdma_stat_read",
149 .data = &rdma_stat_read,
150 .maxlen = sizeof(atomic_t),
151 .mode = 0644,
6d456111 152 .proc_handler = read_reset_stat,
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153 },
154 {
155 .procname = "rdma_stat_recv",
156 .data = &rdma_stat_recv,
157 .maxlen = sizeof(atomic_t),
158 .mode = 0644,
6d456111 159 .proc_handler = read_reset_stat,
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160 },
161 {
162 .procname = "rdma_stat_write",
163 .data = &rdma_stat_write,
164 .maxlen = sizeof(atomic_t),
165 .mode = 0644,
6d456111 166 .proc_handler = read_reset_stat,
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167 },
168 {
169 .procname = "rdma_stat_sq_starve",
170 .data = &rdma_stat_sq_starve,
171 .maxlen = sizeof(atomic_t),
172 .mode = 0644,
6d456111 173 .proc_handler = read_reset_stat,
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174 },
175 {
176 .procname = "rdma_stat_rq_starve",
177 .data = &rdma_stat_rq_starve,
178 .maxlen = sizeof(atomic_t),
179 .mode = 0644,
6d456111 180 .proc_handler = read_reset_stat,
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181 },
182 {
183 .procname = "rdma_stat_rq_poll",
184 .data = &rdma_stat_rq_poll,
185 .maxlen = sizeof(atomic_t),
186 .mode = 0644,
6d456111 187 .proc_handler = read_reset_stat,
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188 },
189 {
190 .procname = "rdma_stat_rq_prod",
191 .data = &rdma_stat_rq_prod,
192 .maxlen = sizeof(atomic_t),
193 .mode = 0644,
6d456111 194 .proc_handler = read_reset_stat,
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195 },
196 {
197 .procname = "rdma_stat_sq_poll",
198 .data = &rdma_stat_sq_poll,
199 .maxlen = sizeof(atomic_t),
200 .mode = 0644,
6d456111 201 .proc_handler = read_reset_stat,
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202 },
203 {
204 .procname = "rdma_stat_sq_prod",
205 .data = &rdma_stat_sq_prod,
206 .maxlen = sizeof(atomic_t),
207 .mode = 0644,
6d456111 208 .proc_handler = read_reset_stat,
ef7fbf59 209 },
f8572d8f 210 { },
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211};
212
fe2c6338 213static struct ctl_table svcrdma_table[] = {
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214 {
215 .procname = "svc_rdma",
216 .mode = 0555,
217 .child = svcrdma_parm_table
218 },
f8572d8f 219 { },
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220};
221
fe2c6338 222static struct ctl_table svcrdma_root_table[] = {
ef7fbf59 223 {
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224 .procname = "sunrpc",
225 .mode = 0555,
226 .child = svcrdma_table
227 },
f8572d8f 228 { },
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229};
230
231void svc_rdma_cleanup(void)
232{
233 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
a25e758c 234 destroy_workqueue(svc_rdma_wq);
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235 if (svcrdma_table_header) {
236 unregister_sysctl_table(svcrdma_table_header);
237 svcrdma_table_header = NULL;
238 }
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239#if defined(CONFIG_SUNRPC_BACKCHANNEL)
240 svc_unreg_xprt_class(&svc_rdma_bc_class);
241#endif
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242 svc_unreg_xprt_class(&svc_rdma_class);
243}
244
245int svc_rdma_init(void)
246{
247 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
248 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
03fe9931 249 dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
03fe9931 250 dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
ef7fbf59 251 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
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252
253 svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
254 if (!svc_rdma_wq)
255 return -ENOMEM;
256
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257 if (!svcrdma_table_header)
258 svcrdma_table_header =
259 register_sysctl_table(svcrdma_root_table);
260
261 /* Register RDMA with the SVC transport switch */
262 svc_reg_xprt_class(&svc_rdma_class);
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263#if defined(CONFIG_SUNRPC_BACKCHANNEL)
264 svc_reg_xprt_class(&svc_rdma_bc_class);
265#endif
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266 return 0;
267}