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_rss_bucket(int fd, int af, int rss_bucket) 51 { 52 int opt; 53 socklen_t optlen; 54 int retval; 55 int f, p; 56 57 switch (af) { 58 case AF_INET: 59 p = IPPROTO_IP; 60 f = IP_RSS_LISTEN_BUCKET; 61 break; 62 case AF_INET6: 63 p = IPPROTO_IPV6; 64 f = IPV6_RSS_LISTEN_BUCKET; 65 break; 66 default: 67 return (-1); 68 } 69 70 /* Set RSS bucket */ 71 opt = rss_bucket; 72 optlen = sizeof(opt); 73 retval = setsockopt(fd, p, f, &opt, optlen); 74 if (retval < 0) { 75 warn("%s: setsockopt(IP_RSS_LISTEN_BUCKET)", __func__); 76 return (-1); 77 } 78 return (0); 79 } 80 81 int 82 rss_sock_set_recvrss(int fd, int af, int val) 83 { 84 int opt, retval; 85 socklen_t optlen; 86 int f1, f2, p; 87 88 switch (af) { 89 case AF_INET: 90 p = IPPROTO_IP; 91 f1 = IP_RECVFLOWID; 92 f2 = IP_RECVRSSBUCKETID; 93 break; 94 case AF_INET6: 95 p = IPPROTO_IPV6; 96 f1 = IPV6_RECVFLOWID; 97 f2 = IPV6_RECVRSSBUCKETID; 98 break; 99 default: 100 return (-1); 101 } 102 103 /* Enable/disable flowid */ 104 opt = val; 105 optlen = sizeof(opt); 106 retval = setsockopt(fd, p, f1, &opt, optlen); 107 if (retval < 0) { 108 warn("%s: setsockopt(IP_RECVFLOWID)", __func__); 109 return (-1); 110 } 111 112 /* Enable/disable RSS bucket reception */ 113 opt = val; 114 optlen = sizeof(opt); 115 retval = setsockopt(fd, p, f2, &opt, optlen); 116 if (retval < 0) { 117 warn("%s: setsockopt(IP_RECVRSSBUCKETID)", __func__); 118 return (-1); 119 } 120 121 return (0); 122 } 123 124 static int 125 rss_getsysctlint(const char *s) 126 { 127 int val, retval; 128 size_t rlen; 129 130 rlen = sizeof(int); 131 retval = sysctlbyname(s, &val, &rlen, NULL, 0); 132 if (retval < 0) { 133 warn("sysctlbyname (%s)", s); 134 return (-1); 135 } 136 137 return (val); 138 } 139 140 static int 141 rss_getbucketmap(int *bucket_map, int nbuckets) 142 { 143 /* XXX I'm lazy; so static string it is */ 144 char bstr[2048]; 145 int retval; 146 size_t rlen; 147 char *s, *ss; 148 int r, b, c; 149 150 /* Paranoia */ 151 memset(bstr, '\0', sizeof(bstr)); 152 153 rlen = sizeof(bstr) - 1; 154 retval = sysctlbyname("net.inet.rss.bucket_mapping", bstr, &rlen, NULL, 0); 155 if (retval < 0) { 156 warn("sysctlbyname (net.inet.rss.bucket_mapping)"); 157 return (-1); 158 } 159 160 ss = bstr; 161 while ((s = strsep(&ss, " ")) != NULL) { 162 r = sscanf(s, "%d:%d", &b, &c); 163 if (r != 2) { 164 fprintf(stderr, "%s: string (%s) not parsable\n", 165 __func__, 166 s); 167 return (-1); 168 } 169 if (b > nbuckets) { 170 fprintf(stderr, "%s: bucket %d > nbuckets %d\n", 171 __func__, 172 b, 173 nbuckets); 174 return (-1); 175 } 176 /* XXX no maxcpu check */ 177 bucket_map[b] = c; 178 } 179 return (0); 180 } 181 182 struct rss_config * 183 rss_config_get(void) 184 { 185 struct rss_config *rc = NULL; 186 187 rc = calloc(1, sizeof(*rc)); 188 if (rc == NULL) { 189 warn("%s: calloc", __func__); 190 goto error; 191 } 192 193 rc->rss_ncpus = rss_getsysctlint("net.inet.rss.ncpus"); 194 if (rc->rss_ncpus < 0) { 195 fprintf(stderr, "%s: couldn't fetch net.inet.rss.ncpus\n", __func__); 196 goto error; 197 } 198 199 rc->rss_nbuckets = rss_getsysctlint("net.inet.rss.buckets"); 200 if (rc->rss_nbuckets < 0) { 201 fprintf(stderr, "%s: couldn't fetch net.inet.rss.nbuckets\n", __func__); 202 goto error; 203 } 204 205 rc->rss_basecpu = rss_getsysctlint("net.inet.rss.basecpu"); 206 if (rc->rss_basecpu< 0) { 207 fprintf(stderr, "%s: couldn't fetch net.inet.rss.basecpu\n", __func__); 208 goto error; 209 } 210 211 rc->rss_bucket_map = calloc(rc->rss_nbuckets, sizeof(int)); 212 if (rc->rss_bucket_map == NULL) { 213 warn("%s: calloc (rss buckets; %d entries)", __func__, rc->rss_nbuckets); 214 goto error; 215 } 216 217 if (rss_getbucketmap(rc->rss_bucket_map, rc->rss_nbuckets) != 0) { 218 fprintf(stderr, "%s: rss_getbucketmap failed\n", __func__); 219 goto error; 220 } 221 222 return (rc); 223 224 error: 225 if (rc != NULL) { 226 free(rc->rss_bucket_map); 227 free(rc); 228 } 229 return (NULL); 230 } 231 232 void 233 rss_config_free(struct rss_config *rc) 234 { 235 236 if ((rc != NULL) && rc->rss_bucket_map) 237 free(rc->rss_bucket_map); 238 if (rc != NULL) 239 free(rc); 240 } 241 242 int 243 rss_config_get_bucket_count(struct rss_config *rc) 244 { 245 246 if (rc == NULL) 247 return (-1); 248 return (rc->rss_nbuckets); 249 } 250 251 int 252 rss_get_bucket_cpuset(struct rss_config *rc, rss_bucket_type_t btype, 253 int bucket, cpuset_t *cs) 254 { 255 256 if (bucket < 0 || bucket >= rc->rss_nbuckets) { 257 errno = EINVAL; 258 return (-1); 259 } 260 261 /* 262 * For now all buckets are the same, but eventually we'll want 263 * to allow administrators to set separate RSS cpusets for 264 * {kernel,user} {tx, rx} combinations. 265 */ 266 if (btype <= RSS_BUCKET_TYPE_NONE || btype > RSS_BUCKET_TYPE_MAX) { 267 errno = ENOTSUP; 268 return (-1); 269 } 270 271 CPU_ZERO(cs); 272 CPU_SET(rc->rss_bucket_map[bucket], cs); 273 274 return (0); 275 } 276 277 int 278 rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, void *cbdata) 279 { 280 281 (void) cb; 282 (void) cbdata; 283 284 /* 285 * For now there's no rebalance callback, so 286 * just return 0 and ignore it. 287 */ 288 return (0); 289 } 290