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/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 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 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 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 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 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 * 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 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 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 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 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