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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
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
75struct kmem_cache *svc_rdma_map_cachep;
76struct kmem_cache *svc_rdma_ctxt_cachep;
77
78struct workqueue_struct *svc_rdma_wq;
79
80
81
82
83
84
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
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
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
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);
302
