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authorTom Tucker <tom@opengridcomputing.com>2007-12-12 17:13:19 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-02-01 16:42:14 -0500
commitef7fbf59e6f780a0fa03536839e3c42e9ce40ad1 (patch)
tree17967c171d3e88fba7726edf0549c5c82fc5b709 /net
parentd21b05f101ae732d9bc322f13eea2f59c0aa60f5 (diff)
rdma: SVCRDMA Transport Module
This file implements the RDMA transport module initialization and termination logic and registers the transport sysctl variables. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma.c266
1 files changed, 266 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
new file mode 100644
index 000000000000..88c0ca20bb1e
--- /dev/null
+++ b/net/sunrpc/xprtrdma/svc_rdma.c
@@ -0,0 +1,266 @@
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 */
52unsigned int svcrdma_ord = RPCRDMA_ORD;
53static unsigned int min_ord = 1;
54static unsigned int max_ord = 4096;
55unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
56static unsigned int min_max_requests = 4;
57static unsigned int max_max_requests = 16384;
58unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
59static unsigned int min_max_inline = 4096;
60static unsigned int max_max_inline = 65536;
61
62atomic_t rdma_stat_recv;
63atomic_t rdma_stat_read;
64atomic_t rdma_stat_write;
65atomic_t rdma_stat_sq_starve;
66atomic_t rdma_stat_rq_starve;
67atomic_t rdma_stat_rq_poll;
68atomic_t rdma_stat_rq_prod;
69atomic_t rdma_stat_sq_poll;
70atomic_t rdma_stat_sq_prod;
71
72/*
73 * This function implements reading and resetting an atomic_t stat
74 * variable through read/write to a proc file. Any write to the file
75 * resets the associated statistic to zero. Any read returns it's
76 * current value.
77 */
78static int read_reset_stat(ctl_table *table, int write,
79 struct file *filp, void __user *buffer, size_t *lenp,
80 loff_t *ppos)
81{
82 atomic_t *stat = (atomic_t *)table->data;
83
84 if (!stat)
85 return -EINVAL;
86
87 if (write)
88 atomic_set(stat, 0);
89 else {
90 char str_buf[32];
91 char *data;
92 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
93 if (len >= 32)
94 return -EFAULT;
95 len = strlen(str_buf);
96 if (*ppos > len) {
97 *lenp = 0;
98 return 0;
99 }
100 data = &str_buf[*ppos];
101 len -= *ppos;
102 if (len > *lenp)
103 len = *lenp;
104 if (len && copy_to_user(buffer, str_buf, len))
105 return -EFAULT;
106 *lenp = len;
107 *ppos += len;
108 }
109 return 0;
110}
111
112static struct ctl_table_header *svcrdma_table_header;
113static ctl_table svcrdma_parm_table[] = {
114 {
115 .procname = "max_requests",
116 .data = &svcrdma_max_requests,
117 .maxlen = sizeof(unsigned int),
118 .mode = 0644,
119 .proc_handler = &proc_dointvec_minmax,
120 .strategy = &sysctl_intvec,
121 .extra1 = &min_max_requests,
122 .extra2 = &max_max_requests
123 },
124 {
125 .procname = "max_req_size",
126 .data = &svcrdma_max_req_size,
127 .maxlen = sizeof(unsigned int),
128 .mode = 0644,
129 .proc_handler = &proc_dointvec_minmax,
130 .strategy = &sysctl_intvec,
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 .strategy = &sysctl_intvec,
141 .extra1 = &min_ord,
142 .extra2 = &max_ord,
143 },
144
145 {
146 .procname = "rdma_stat_read",
147 .data = &rdma_stat_read,
148 .maxlen = sizeof(atomic_t),
149 .mode = 0644,
150 .proc_handler = &read_reset_stat,
151 },
152 {
153 .procname = "rdma_stat_recv",
154 .data = &rdma_stat_recv,
155 .maxlen = sizeof(atomic_t),
156 .mode = 0644,
157 .proc_handler = &read_reset_stat,
158 },
159 {
160 .procname = "rdma_stat_write",
161 .data = &rdma_stat_write,
162 .maxlen = sizeof(atomic_t),
163 .mode = 0644,
164 .proc_handler = &read_reset_stat,
165 },
166 {
167 .procname = "rdma_stat_sq_starve",
168 .data = &rdma_stat_sq_starve,
169 .maxlen = sizeof(atomic_t),
170 .mode = 0644,
171 .proc_handler = &read_reset_stat,
172 },
173 {
174 .procname = "rdma_stat_rq_starve",
175 .data = &rdma_stat_rq_starve,
176 .maxlen = sizeof(atomic_t),
177 .mode = 0644,
178 .proc_handler = &read_reset_stat,
179 },
180 {
181 .procname = "rdma_stat_rq_poll",
182 .data = &rdma_stat_rq_poll,
183 .maxlen = sizeof(atomic_t),
184 .mode = 0644,
185 .proc_handler = &read_reset_stat,
186 },
187 {
188 .procname = "rdma_stat_rq_prod",
189 .data = &rdma_stat_rq_prod,
190 .maxlen = sizeof(atomic_t),
191 .mode = 0644,
192 .proc_handler = &read_reset_stat,
193 },
194 {
195 .procname = "rdma_stat_sq_poll",
196 .data = &rdma_stat_sq_poll,
197 .maxlen = sizeof(atomic_t),
198 .mode = 0644,
199 .proc_handler = &read_reset_stat,
200 },
201 {
202 .procname = "rdma_stat_sq_prod",
203 .data = &rdma_stat_sq_prod,
204 .maxlen = sizeof(atomic_t),
205 .mode = 0644,
206 .proc_handler = &read_reset_stat,
207 },
208 {
209 .ctl_name = 0,
210 },
211};
212
213static ctl_table svcrdma_table[] = {
214 {
215 .procname = "svc_rdma",
216 .mode = 0555,
217 .child = svcrdma_parm_table
218 },
219 {
220 .ctl_name = 0,
221 },
222};
223
224static ctl_table svcrdma_root_table[] = {
225 {
226 .ctl_name = CTL_SUNRPC,
227 .procname = "sunrpc",
228 .mode = 0555,
229 .child = svcrdma_table
230 },
231 {
232 .ctl_name = 0,
233 },
234};
235
236void svc_rdma_cleanup(void)
237{
238 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
239 if (svcrdma_table_header) {
240 unregister_sysctl_table(svcrdma_table_header);
241 svcrdma_table_header = NULL;
242 }
243 svc_unreg_xprt_class(&svc_rdma_class);
244}
245
246int svc_rdma_init(void)
247{
248 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
249 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
250 dprintk("\tmax_requests : %d\n", svcrdma_max_requests);
251 dprintk("\tsq_depth : %d\n",
252 svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
253 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
254 if (!svcrdma_table_header)
255 svcrdma_table_header =
256 register_sysctl_table(svcrdma_root_table);
257
258 /* Register RDMA with the SVC transport switch */
259 svc_reg_xprt_class(&svc_rdma_class);
260 return 0;
261}
262MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
263MODULE_DESCRIPTION("SVC RDMA Transport");
264MODULE_LICENSE("Dual BSD/GPL");
265module_init(svc_rdma_init);
266module_exit(svc_rdma_cleanup);