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