2 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
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.
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
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.
39 * Author: Tom Tucker <tom@opengridcomputing.com>
41 #include <linux/module.h>
42 #include <linux/init.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>
49 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
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;
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;
72 /* Temporary NFS request map cache */
73 struct kmem_cache *svc_rdma_map_cachep;
76 * This function implements reading and resetting an atomic_t stat
77 * variable through read/write to a proc file. Any write to the file
78 * resets the associated statistic to zero. Any read returns it's
81 static int read_reset_stat(ctl_table *table, int write,
82 struct file *filp, void __user *buffer, size_t *lenp,
85 atomic_t *stat = (atomic_t *)table->data;
95 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
98 len = strlen(str_buf);
103 data = &str_buf[*ppos];
107 if (len && copy_to_user(buffer, str_buf, len))
115 static struct ctl_table_header *svcrdma_table_header;
116 static ctl_table svcrdma_parm_table[] = {
118 .procname = "max_requests",
119 .data = &svcrdma_max_requests,
120 .maxlen = sizeof(unsigned int),
122 .proc_handler = &proc_dointvec_minmax,
123 .strategy = &sysctl_intvec,
124 .extra1 = &min_max_requests,
125 .extra2 = &max_max_requests
128 .procname = "max_req_size",
129 .data = &svcrdma_max_req_size,
130 .maxlen = sizeof(unsigned int),
132 .proc_handler = &proc_dointvec_minmax,
133 .strategy = &sysctl_intvec,
134 .extra1 = &min_max_inline,
135 .extra2 = &max_max_inline
138 .procname = "max_outbound_read_requests",
139 .data = &svcrdma_ord,
140 .maxlen = sizeof(unsigned int),
142 .proc_handler = &proc_dointvec_minmax,
143 .strategy = &sysctl_intvec,
149 .procname = "rdma_stat_read",
150 .data = &rdma_stat_read,
151 .maxlen = sizeof(atomic_t),
153 .proc_handler = &read_reset_stat,
156 .procname = "rdma_stat_recv",
157 .data = &rdma_stat_recv,
158 .maxlen = sizeof(atomic_t),
160 .proc_handler = &read_reset_stat,
163 .procname = "rdma_stat_write",
164 .data = &rdma_stat_write,
165 .maxlen = sizeof(atomic_t),
167 .proc_handler = &read_reset_stat,
170 .procname = "rdma_stat_sq_starve",
171 .data = &rdma_stat_sq_starve,
172 .maxlen = sizeof(atomic_t),
174 .proc_handler = &read_reset_stat,
177 .procname = "rdma_stat_rq_starve",
178 .data = &rdma_stat_rq_starve,
179 .maxlen = sizeof(atomic_t),
181 .proc_handler = &read_reset_stat,
184 .procname = "rdma_stat_rq_poll",
185 .data = &rdma_stat_rq_poll,
186 .maxlen = sizeof(atomic_t),
188 .proc_handler = &read_reset_stat,
191 .procname = "rdma_stat_rq_prod",
192 .data = &rdma_stat_rq_prod,
193 .maxlen = sizeof(atomic_t),
195 .proc_handler = &read_reset_stat,
198 .procname = "rdma_stat_sq_poll",
199 .data = &rdma_stat_sq_poll,
200 .maxlen = sizeof(atomic_t),
202 .proc_handler = &read_reset_stat,
205 .procname = "rdma_stat_sq_prod",
206 .data = &rdma_stat_sq_prod,
207 .maxlen = sizeof(atomic_t),
209 .proc_handler = &read_reset_stat,
216 static ctl_table svcrdma_table[] = {
218 .procname = "svc_rdma",
220 .child = svcrdma_parm_table
227 static ctl_table svcrdma_root_table[] = {
229 .ctl_name = CTL_SUNRPC,
230 .procname = "sunrpc",
232 .child = svcrdma_table
239 void svc_rdma_cleanup(void)
241 dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
242 if (svcrdma_table_header) {
243 unregister_sysctl_table(svcrdma_table_header);
244 svcrdma_table_header = NULL;
246 svc_unreg_xprt_class(&svc_rdma_class);
247 kmem_cache_destroy(svc_rdma_map_cachep);
250 int svc_rdma_init(void)
252 dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
253 dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
254 dprintk("\tmax_requests : %d\n", svcrdma_max_requests);
255 dprintk("\tsq_depth : %d\n",
256 svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
257 dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
258 if (!svcrdma_table_header)
259 svcrdma_table_header =
260 register_sysctl_table(svcrdma_root_table);
262 /* Create the temporary map cache */
263 svc_rdma_map_cachep = kmem_cache_create("svc_rdma_map_cache",
264 sizeof(struct svc_rdma_req_map),
268 if (!svc_rdma_map_cachep) {
269 printk(KERN_INFO "Could not allocate map cache.\n");
273 /* Register RDMA with the SVC transport switch */
274 svc_reg_xprt_class(&svc_rdma_class);
278 unregister_sysctl_table(svcrdma_table_header);
281 MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
282 MODULE_DESCRIPTION("SVC RDMA Transport");
283 MODULE_LICENSE("Dual BSD/GPL");
284 module_init(svc_rdma_init);
285 module_exit(svc_rdma_cleanup);