In preparation for the removal of the IP_RSS_LISTEN_BUCKET socket option. PR: 261398 (exp-run) Reviewed by: glebius Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D38821
258 lines
5.6 KiB
C
258 lines
5.6 KiB
C
/*
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* Copyright (c) 2016 Adrian Chadd <adrian@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/cpuset.h>
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#include <sys/sysctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <strings.h>
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#include <err.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include "librss.h"
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int
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rss_sock_set_recvrss(int fd, int af, int val)
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{
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int opt, retval;
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socklen_t optlen;
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int f1, f2, p;
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switch (af) {
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case AF_INET:
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p = IPPROTO_IP;
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f1 = IP_RECVFLOWID;
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f2 = IP_RECVRSSBUCKETID;
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break;
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case AF_INET6:
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p = IPPROTO_IPV6;
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f1 = IPV6_RECVFLOWID;
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f2 = IPV6_RECVRSSBUCKETID;
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break;
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default:
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return (-1);
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}
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/* Enable/disable flowid */
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opt = val;
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optlen = sizeof(opt);
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retval = setsockopt(fd, p, f1, &opt, optlen);
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if (retval < 0) {
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warn("%s: setsockopt(IP_RECVFLOWID)", __func__);
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return (-1);
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}
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/* Enable/disable RSS bucket reception */
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opt = val;
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optlen = sizeof(opt);
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retval = setsockopt(fd, p, f2, &opt, optlen);
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if (retval < 0) {
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warn("%s: setsockopt(IP_RECVRSSBUCKETID)", __func__);
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return (-1);
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}
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return (0);
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}
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static int
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rss_getsysctlint(const char *s)
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{
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int val, retval;
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size_t rlen;
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rlen = sizeof(int);
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retval = sysctlbyname(s, &val, &rlen, NULL, 0);
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if (retval < 0) {
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warn("sysctlbyname (%s)", s);
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return (-1);
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}
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return (val);
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}
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static int
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rss_getbucketmap(int *bucket_map, int nbuckets)
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{
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/* XXX I'm lazy; so static string it is */
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char bstr[2048];
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int retval;
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size_t rlen;
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char *s, *ss;
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int r, b, c;
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/* Paranoia */
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memset(bstr, '\0', sizeof(bstr));
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rlen = sizeof(bstr) - 1;
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retval = sysctlbyname("net.inet.rss.bucket_mapping", bstr, &rlen, NULL, 0);
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if (retval < 0) {
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warn("sysctlbyname (net.inet.rss.bucket_mapping)");
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return (-1);
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}
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ss = bstr;
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while ((s = strsep(&ss, " ")) != NULL) {
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r = sscanf(s, "%d:%d", &b, &c);
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if (r != 2) {
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fprintf(stderr, "%s: string (%s) not parsable\n",
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__func__,
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s);
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return (-1);
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}
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if (b > nbuckets) {
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fprintf(stderr, "%s: bucket %d > nbuckets %d\n",
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__func__,
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b,
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nbuckets);
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return (-1);
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}
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/* XXX no maxcpu check */
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bucket_map[b] = c;
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}
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return (0);
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}
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struct rss_config *
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rss_config_get(void)
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{
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struct rss_config *rc = NULL;
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rc = calloc(1, sizeof(*rc));
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if (rc == NULL) {
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warn("%s: calloc", __func__);
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goto error;
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}
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rc->rss_ncpus = rss_getsysctlint("net.inet.rss.ncpus");
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if (rc->rss_ncpus < 0) {
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fprintf(stderr, "%s: couldn't fetch net.inet.rss.ncpus\n", __func__);
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goto error;
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}
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rc->rss_nbuckets = rss_getsysctlint("net.inet.rss.buckets");
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if (rc->rss_nbuckets < 0) {
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fprintf(stderr, "%s: couldn't fetch net.inet.rss.nbuckets\n", __func__);
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goto error;
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}
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rc->rss_basecpu = rss_getsysctlint("net.inet.rss.basecpu");
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if (rc->rss_basecpu< 0) {
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fprintf(stderr, "%s: couldn't fetch net.inet.rss.basecpu\n", __func__);
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goto error;
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}
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rc->rss_bucket_map = calloc(rc->rss_nbuckets, sizeof(int));
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if (rc->rss_bucket_map == NULL) {
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warn("%s: calloc (rss buckets; %d entries)", __func__, rc->rss_nbuckets);
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goto error;
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}
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if (rss_getbucketmap(rc->rss_bucket_map, rc->rss_nbuckets) != 0) {
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fprintf(stderr, "%s: rss_getbucketmap failed\n", __func__);
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goto error;
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}
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return (rc);
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error:
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if (rc != NULL) {
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free(rc->rss_bucket_map);
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free(rc);
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}
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return (NULL);
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}
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void
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rss_config_free(struct rss_config *rc)
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{
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if ((rc != NULL) && rc->rss_bucket_map)
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free(rc->rss_bucket_map);
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if (rc != NULL)
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free(rc);
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}
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int
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rss_config_get_bucket_count(struct rss_config *rc)
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{
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if (rc == NULL)
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return (-1);
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return (rc->rss_nbuckets);
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}
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int
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rss_get_bucket_cpuset(struct rss_config *rc, rss_bucket_type_t btype,
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int bucket, cpuset_t *cs)
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{
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if (bucket < 0 || bucket >= rc->rss_nbuckets) {
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errno = EINVAL;
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return (-1);
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}
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/*
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* For now all buckets are the same, but eventually we'll want
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* to allow administrators to set separate RSS cpusets for
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* {kernel,user} {tx, rx} combinations.
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*/
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if (btype <= RSS_BUCKET_TYPE_NONE || btype > RSS_BUCKET_TYPE_MAX) {
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errno = ENOTSUP;
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return (-1);
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}
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CPU_ZERO(cs);
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CPU_SET(rc->rss_bucket_map[bucket], cs);
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return (0);
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}
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int
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rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, void *cbdata)
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{
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(void) cb;
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(void) cbdata;
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/*
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* For now there's no rebalance callback, so
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* just return 0 and ignore it.
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*/
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return (0);
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}
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