1 /*
2 * Copyright (c) 2016 Adrian Chadd <adrian@FreeBSD.org>
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/param.h>
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <sys/cpuset.h>
31 #include <sys/sysctl.h>
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36 #include <strings.h>
37 #include <err.h>
38 #include <fcntl.h>
39 #include <string.h>
40 #include <errno.h>
41
42 #include <netinet/in.h>
43
44 #include "librss.h"
45
46 int
rss_sock_set_recvrss(int fd,int af,int val)47 rss_sock_set_recvrss(int fd, int af, int val)
48 {
49 int opt, retval;
50 socklen_t optlen;
51 int f1, f2, p;
52
53 switch (af) {
54 case AF_INET:
55 p = IPPROTO_IP;
56 f1 = IP_RECVFLOWID;
57 f2 = IP_RECVRSSBUCKETID;
58 break;
59 case AF_INET6:
60 p = IPPROTO_IPV6;
61 f1 = IPV6_RECVFLOWID;
62 f2 = IPV6_RECVRSSBUCKETID;
63 break;
64 default:
65 return (-1);
66 }
67
68 /* Enable/disable flowid */
69 opt = val;
70 optlen = sizeof(opt);
71 retval = setsockopt(fd, p, f1, &opt, optlen);
72 if (retval < 0) {
73 warn("%s: setsockopt(IP_RECVFLOWID)", __func__);
74 return (-1);
75 }
76
77 /* Enable/disable RSS bucket reception */
78 opt = val;
79 optlen = sizeof(opt);
80 retval = setsockopt(fd, p, f2, &opt, optlen);
81 if (retval < 0) {
82 warn("%s: setsockopt(IP_RECVRSSBUCKETID)", __func__);
83 return (-1);
84 }
85
86 return (0);
87 }
88
89 static int
rss_getsysctlint(const char * s)90 rss_getsysctlint(const char *s)
91 {
92 int val, retval;
93 size_t rlen;
94
95 rlen = sizeof(int);
96 retval = sysctlbyname(s, &val, &rlen, NULL, 0);
97 if (retval < 0) {
98 warn("sysctlbyname (%s)", s);
99 return (-1);
100 }
101
102 return (val);
103 }
104
105 static int
rss_getbucketmap(int * bucket_map,int nbuckets)106 rss_getbucketmap(int *bucket_map, int nbuckets)
107 {
108 /* XXX I'm lazy; so static string it is */
109 char bstr[2048];
110 int retval;
111 size_t rlen;
112 char *s, *ss;
113 int r, b, c;
114
115 /* Paranoia */
116 memset(bstr, '\0', sizeof(bstr));
117
118 rlen = sizeof(bstr) - 1;
119 retval = sysctlbyname("net.inet.rss.bucket_mapping", bstr, &rlen, NULL, 0);
120 if (retval < 0) {
121 warn("sysctlbyname (net.inet.rss.bucket_mapping)");
122 return (-1);
123 }
124
125 ss = bstr;
126 while ((s = strsep(&ss, " ")) != NULL) {
127 r = sscanf(s, "%d:%d", &b, &c);
128 if (r != 2) {
129 fprintf(stderr, "%s: string (%s) not parsable\n",
130 __func__,
131 s);
132 return (-1);
133 }
134 if (b > nbuckets) {
135 fprintf(stderr, "%s: bucket %d > nbuckets %d\n",
136 __func__,
137 b,
138 nbuckets);
139 return (-1);
140 }
141 /* XXX no maxcpu check */
142 bucket_map[b] = c;
143 }
144 return (0);
145 }
146
147 struct rss_config *
rss_config_get(void)148 rss_config_get(void)
149 {
150 struct rss_config *rc = NULL;
151
152 rc = calloc(1, sizeof(*rc));
153 if (rc == NULL) {
154 warn("%s: calloc", __func__);
155 goto error;
156 }
157
158 rc->rss_ncpus = rss_getsysctlint("net.inet.rss.ncpus");
159 if (rc->rss_ncpus < 0) {
160 fprintf(stderr, "%s: couldn't fetch net.inet.rss.ncpus\n", __func__);
161 goto error;
162 }
163
164 rc->rss_nbuckets = rss_getsysctlint("net.inet.rss.buckets");
165 if (rc->rss_nbuckets < 0) {
166 fprintf(stderr, "%s: couldn't fetch net.inet.rss.nbuckets\n", __func__);
167 goto error;
168 }
169
170 rc->rss_basecpu = rss_getsysctlint("net.inet.rss.basecpu");
171 if (rc->rss_basecpu< 0) {
172 fprintf(stderr, "%s: couldn't fetch net.inet.rss.basecpu\n", __func__);
173 goto error;
174 }
175
176 rc->rss_bucket_map = calloc(rc->rss_nbuckets, sizeof(int));
177 if (rc->rss_bucket_map == NULL) {
178 warn("%s: calloc (rss buckets; %d entries)", __func__, rc->rss_nbuckets);
179 goto error;
180 }
181
182 if (rss_getbucketmap(rc->rss_bucket_map, rc->rss_nbuckets) != 0) {
183 fprintf(stderr, "%s: rss_getbucketmap failed\n", __func__);
184 goto error;
185 }
186
187 return (rc);
188
189 error:
190 if (rc != NULL) {
191 free(rc->rss_bucket_map);
192 free(rc);
193 }
194 return (NULL);
195 }
196
197 void
rss_config_free(struct rss_config * rc)198 rss_config_free(struct rss_config *rc)
199 {
200
201 if ((rc != NULL) && rc->rss_bucket_map)
202 free(rc->rss_bucket_map);
203 if (rc != NULL)
204 free(rc);
205 }
206
207 int
rss_config_get_bucket_count(struct rss_config * rc)208 rss_config_get_bucket_count(struct rss_config *rc)
209 {
210
211 if (rc == NULL)
212 return (-1);
213 return (rc->rss_nbuckets);
214 }
215
216 int
rss_get_bucket_cpuset(struct rss_config * rc,rss_bucket_type_t btype,int bucket,cpuset_t * cs)217 rss_get_bucket_cpuset(struct rss_config *rc, rss_bucket_type_t btype,
218 int bucket, cpuset_t *cs)
219 {
220
221 if (bucket < 0 || bucket >= rc->rss_nbuckets) {
222 errno = EINVAL;
223 return (-1);
224 }
225
226 /*
227 * For now all buckets are the same, but eventually we'll want
228 * to allow administrators to set separate RSS cpusets for
229 * {kernel,user} {tx, rx} combinations.
230 */
231 if (btype <= RSS_BUCKET_TYPE_NONE || btype > RSS_BUCKET_TYPE_MAX) {
232 errno = ENOTSUP;
233 return (-1);
234 }
235
236 CPU_ZERO(cs);
237 CPU_SET(rc->rss_bucket_map[bucket], cs);
238
239 return (0);
240 }
241
242 int
rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t * cb,void * cbdata)243 rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, void *cbdata)
244 {
245
246 (void) cb;
247 (void) cbdata;
248
249 /*
250 * For now there's no rebalance callback, so
251 * just return 0 and ignore it.
252 */
253 return (0);
254 }
255