1 /*
2 * Copyright (c) 2016 Adrian Chadd <[email protected]>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <sys/cpuset.h>
34 #include <sys/sysctl.h>
35
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <unistd.h>
39 #include <strings.h>
40 #include <err.h>
41 #include <fcntl.h>
42 #include <string.h>
43 #include <errno.h>
44
45 #include <netinet/in.h>
46
47 #include "librss.h"
48
49 int
rss_sock_set_bindmulti(int fd,int af,int val)50 rss_sock_set_bindmulti(int fd, int af, int val)
51 {
52 int opt;
53 socklen_t optlen;
54 int retval;
55
56 /* Set bindmulti */
57 opt = val;
58 optlen = sizeof(opt);
59 retval = setsockopt(fd,
60 af == AF_INET ? IPPROTO_IP : IPPROTO_IPV6,
61 af == AF_INET ? IP_BINDMULTI : IPV6_BINDMULTI,
62 &opt,
63 optlen);
64 if (retval < 0) {
65 warn("%s: setsockopt(IP_BINDMULTI)", __func__);
66 return (-1);
67 }
68 return (0);
69 }
70
71 int
rss_sock_set_rss_bucket(int fd,int af,int rss_bucket)72 rss_sock_set_rss_bucket(int fd, int af, int rss_bucket)
73 {
74 int opt;
75 socklen_t optlen;
76 int retval;
77 int f, p;
78
79 switch (af) {
80 case AF_INET:
81 p = IPPROTO_IP;
82 f = IP_RSS_LISTEN_BUCKET;
83 break;
84 case AF_INET6:
85 p = IPPROTO_IPV6;
86 f = IPV6_RSS_LISTEN_BUCKET;
87 break;
88 default:
89 return (-1);
90 }
91
92 /* Set RSS bucket */
93 opt = rss_bucket;
94 optlen = sizeof(opt);
95 retval = setsockopt(fd, p, f, &opt, optlen);
96 if (retval < 0) {
97 warn("%s: setsockopt(IP_RSS_LISTEN_BUCKET)", __func__);
98 return (-1);
99 }
100 return (0);
101 }
102
103 int
rss_sock_set_recvrss(int fd,int af,int val)104 rss_sock_set_recvrss(int fd, int af, int val)
105 {
106 int opt, retval;
107 socklen_t optlen;
108 int f1, f2, p;
109
110 switch (af) {
111 case AF_INET:
112 p = IPPROTO_IP;
113 f1 = IP_RECVFLOWID;
114 f2 = IP_RECVRSSBUCKETID;
115 break;
116 case AF_INET6:
117 p = IPPROTO_IPV6;
118 f1 = IPV6_RECVFLOWID;
119 f2 = IPV6_RECVRSSBUCKETID;
120 break;
121 default:
122 return (-1);
123 }
124
125 /* Enable/disable flowid */
126 opt = val;
127 optlen = sizeof(opt);
128 retval = setsockopt(fd, p, f1, &opt, optlen);
129 if (retval < 0) {
130 warn("%s: setsockopt(IP_RECVFLOWID)", __func__);
131 return (-1);
132 }
133
134 /* Enable/disable RSS bucket reception */
135 opt = val;
136 optlen = sizeof(opt);
137 retval = setsockopt(fd, p, f2, &opt, optlen);
138 if (retval < 0) {
139 warn("%s: setsockopt(IP_RECVRSSBUCKETID)", __func__);
140 return (-1);
141 }
142
143 return (0);
144 }
145
146 static int
rss_getsysctlint(const char * s)147 rss_getsysctlint(const char *s)
148 {
149 int val, retval;
150 size_t rlen;
151
152 rlen = sizeof(int);
153 retval = sysctlbyname(s, &val, &rlen, NULL, 0);
154 if (retval < 0) {
155 warn("sysctlbyname (%s)", s);
156 return (-1);
157 }
158
159 return (val);
160 }
161
162 static int
rss_getbucketmap(int * bucket_map,int nbuckets)163 rss_getbucketmap(int *bucket_map, int nbuckets)
164 {
165 /* XXX I'm lazy; so static string it is */
166 char bstr[2048];
167 int retval;
168 size_t rlen;
169 char *s, *ss;
170 int r, b, c;
171
172 /* Paranoia */
173 memset(bstr, '\0', sizeof(bstr));
174
175 rlen = sizeof(bstr) - 1;
176 retval = sysctlbyname("net.inet.rss.bucket_mapping", bstr, &rlen, NULL, 0);
177 if (retval < 0) {
178 warn("sysctlbyname (net.inet.rss.bucket_mapping)");
179 return (-1);
180 }
181
182 ss = bstr;
183 while ((s = strsep(&ss, " ")) != NULL) {
184 r = sscanf(s, "%d:%d", &b, &c);
185 if (r != 2) {
186 fprintf(stderr, "%s: string (%s) not parsable\n",
187 __func__,
188 s);
189 return (-1);
190 }
191 if (b > nbuckets) {
192 fprintf(stderr, "%s: bucket %d > nbuckets %d\n",
193 __func__,
194 b,
195 nbuckets);
196 return (-1);
197 }
198 /* XXX no maxcpu check */
199 bucket_map[b] = c;
200 }
201 return (0);
202 }
203
204 struct rss_config *
rss_config_get(void)205 rss_config_get(void)
206 {
207 struct rss_config *rc = NULL;
208
209 rc = calloc(1, sizeof(*rc));
210 if (rc == NULL) {
211 warn("%s: calloc", __func__);
212 goto error;
213 }
214
215 rc->rss_ncpus = rss_getsysctlint("net.inet.rss.ncpus");
216 if (rc->rss_ncpus < 0) {
217 fprintf(stderr, "%s: couldn't fetch net.inet.rss.ncpus\n", __func__);
218 goto error;
219 }
220
221 rc->rss_nbuckets = rss_getsysctlint("net.inet.rss.buckets");
222 if (rc->rss_nbuckets < 0) {
223 fprintf(stderr, "%s: couldn't fetch net.inet.rss.nbuckets\n", __func__);
224 goto error;
225 }
226
227 rc->rss_basecpu = rss_getsysctlint("net.inet.rss.basecpu");
228 if (rc->rss_basecpu< 0) {
229 fprintf(stderr, "%s: couldn't fetch net.inet.rss.basecpu\n", __func__);
230 goto error;
231 }
232
233 rc->rss_bucket_map = calloc(rc->rss_nbuckets, sizeof(int));
234 if (rc->rss_bucket_map == NULL) {
235 warn("%s: calloc (rss buckets; %d entries)", __func__, rc->rss_nbuckets);
236 goto error;
237 }
238
239 if (rss_getbucketmap(rc->rss_bucket_map, rc->rss_nbuckets) != 0) {
240 fprintf(stderr, "%s: rss_getbucketmap failed\n", __func__);
241 goto error;
242 }
243
244 return (rc);
245
246 error:
247 if (rc != NULL) {
248 free(rc->rss_bucket_map);
249 free(rc);
250 }
251 return (NULL);
252 }
253
254 void
rss_config_free(struct rss_config * rc)255 rss_config_free(struct rss_config *rc)
256 {
257
258 if ((rc != NULL) && rc->rss_bucket_map)
259 free(rc->rss_bucket_map);
260 if (rc != NULL)
261 free(rc);
262 }
263
264 int
rss_config_get_bucket_count(struct rss_config * rc)265 rss_config_get_bucket_count(struct rss_config *rc)
266 {
267
268 if (rc == NULL)
269 return (-1);
270 return (rc->rss_nbuckets);
271 }
272
273 int
rss_get_bucket_cpuset(struct rss_config * rc,rss_bucket_type_t btype,int bucket,cpuset_t * cs)274 rss_get_bucket_cpuset(struct rss_config *rc, rss_bucket_type_t btype,
275 int bucket, cpuset_t *cs)
276 {
277
278 if (bucket < 0 || bucket >= rc->rss_nbuckets) {
279 errno = EINVAL;
280 return (-1);
281 }
282
283 /*
284 * For now all buckets are the same, but eventually we'll want
285 * to allow administrators to set separate RSS cpusets for
286 * {kernel,user} {tx, rx} combinations.
287 */
288 if (btype <= RSS_BUCKET_TYPE_NONE || btype > RSS_BUCKET_TYPE_MAX) {
289 errno = ENOTSUP;
290 return (-1);
291 }
292
293 CPU_ZERO(cs);
294 CPU_SET(rc->rss_bucket_map[bucket], cs);
295
296 return (0);
297 }
298
299 int
rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t * cb,void * cbdata)300 rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, void *cbdata)
301 {
302
303 (void) cb;
304 (void) cbdata;
305
306 /*
307 * For now there's no rebalance callback, so
308 * just return 0 and ignore it.
309 */
310 return (0);
311 }
312