freebsd-dev/lib/librss/librss.c
Pedro F. Giffuni 3b243527db librss: simplify some NULL checks.
MFC after:	1 week
2017-02-27 00:10:00 +00:00

312 lines
6.5 KiB
C

/*
* Copyright (c) 2016 Adrian Chadd <adrian@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/cpuset.h>
#include <sys/sysctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
#include <err.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#include "librss.h"
int
rss_sock_set_bindmulti(int fd, int af, int val)
{
int opt;
socklen_t optlen;
int retval;
/* Set bindmulti */
opt = val;
optlen = sizeof(opt);
retval = setsockopt(fd,
af == AF_INET ? IPPROTO_IP : IPPROTO_IPV6,
af == AF_INET ? IP_BINDMULTI : IPV6_BINDMULTI,
&opt,
optlen);
if (retval < 0) {
warn("%s: setsockopt(IP_BINDMULTI)", __func__);
return (-1);
}
return (0);
}
int
rss_sock_set_rss_bucket(int fd, int af, int rss_bucket)
{
int opt;
socklen_t optlen;
int retval;
int f, p;
switch (af) {
case AF_INET:
p = IPPROTO_IP;
f = IP_RSS_LISTEN_BUCKET;
break;
case AF_INET6:
p = IPPROTO_IPV6;
f = IPV6_RSS_LISTEN_BUCKET;
break;
default:
return (-1);
}
/* Set RSS bucket */
opt = rss_bucket;
optlen = sizeof(opt);
retval = setsockopt(fd, p, f, &opt, optlen);
if (retval < 0) {
warn("%s: setsockopt(IP_RSS_LISTEN_BUCKET)", __func__);
return (-1);
}
return (0);
}
int
rss_sock_set_recvrss(int fd, int af, int val)
{
int opt, retval;
socklen_t optlen;
int f1, f2, p;
switch (af) {
case AF_INET:
p = IPPROTO_IP;
f1 = IP_RECVFLOWID;
f2 = IP_RECVRSSBUCKETID;
break;
case AF_INET6:
p = IPPROTO_IPV6;
f1 = IPV6_RECVFLOWID;
f2 = IPV6_RECVRSSBUCKETID;
break;
default:
return (-1);
}
/* Enable/disable flowid */
opt = val;
optlen = sizeof(opt);
retval = setsockopt(fd, p, f1, &opt, optlen);
if (retval < 0) {
warn("%s: setsockopt(IP_RECVFLOWID)", __func__);
return (-1);
}
/* Enable/disable RSS bucket reception */
opt = val;
optlen = sizeof(opt);
retval = setsockopt(fd, p, f2, &opt, optlen);
if (retval < 0) {
warn("%s: setsockopt(IP_RECVRSSBUCKETID)", __func__);
return (-1);
}
return (0);
}
static int
rss_getsysctlint(const char *s)
{
int val, retval;
size_t rlen;
rlen = sizeof(int);
retval = sysctlbyname(s, &val, &rlen, NULL, 0);
if (retval < 0) {
warn("sysctlbyname (%s)", s);
return (-1);
}
return (val);
}
static int
rss_getbucketmap(int *bucket_map, int nbuckets)
{
/* XXX I'm lazy; so static string it is */
char bstr[2048];
int retval;
size_t rlen;
char *s, *ss;
int r, b, c;
/* Paranoia */
memset(bstr, '\0', sizeof(bstr));
rlen = sizeof(bstr) - 1;
retval = sysctlbyname("net.inet.rss.bucket_mapping", bstr, &rlen, NULL, 0);
if (retval < 0) {
warn("sysctlbyname (net.inet.rss.bucket_mapping)");
return (-1);
}
ss = bstr;
while ((s = strsep(&ss, " ")) != NULL) {
r = sscanf(s, "%d:%d", &b, &c);
if (r != 2) {
fprintf(stderr, "%s: string (%s) not parsable\n",
__func__,
s);
return (-1);
}
if (b > nbuckets) {
fprintf(stderr, "%s: bucket %d > nbuckets %d\n",
__func__,
b,
nbuckets);
return (-1);
}
/* XXX no maxcpu check */
bucket_map[b] = c;
}
return (0);
}
struct rss_config *
rss_config_get(void)
{
struct rss_config *rc = NULL;
rc = calloc(1, sizeof(*rc));
if (rc == NULL) {
warn("%s: calloc", __func__);
goto error;
}
rc->rss_ncpus = rss_getsysctlint("net.inet.rss.ncpus");
if (rc->rss_ncpus < 0) {
fprintf(stderr, "%s: couldn't fetch net.inet.rss.ncpus\n", __func__);
goto error;
}
rc->rss_nbuckets = rss_getsysctlint("net.inet.rss.buckets");
if (rc->rss_nbuckets < 0) {
fprintf(stderr, "%s: couldn't fetch net.inet.rss.nbuckets\n", __func__);
goto error;
}
rc->rss_basecpu = rss_getsysctlint("net.inet.rss.basecpu");
if (rc->rss_basecpu< 0) {
fprintf(stderr, "%s: couldn't fetch net.inet.rss.basecpu\n", __func__);
goto error;
}
rc->rss_bucket_map = calloc(rc->rss_nbuckets, sizeof(int));
if (rc->rss_bucket_map == NULL) {
warn("%s: calloc (rss buckets; %d entries)", __func__, rc->rss_nbuckets);
goto error;
}
if (rss_getbucketmap(rc->rss_bucket_map, rc->rss_nbuckets) != 0) {
fprintf(stderr, "%s: rss_getbucketmap failed\n", __func__);
goto error;
}
return (rc);
error:
if (rc != NULL) {
free(rc->rss_bucket_map);
free(rc);
}
return (NULL);
}
void
rss_config_free(struct rss_config *rc)
{
if ((rc != NULL) && rc->rss_bucket_map)
free(rc->rss_bucket_map);
if (rc != NULL)
free(rc);
}
int
rss_config_get_bucket_count(struct rss_config *rc)
{
if (rc == NULL)
return (-1);
return (rc->rss_nbuckets);
}
int
rss_get_bucket_cpuset(struct rss_config *rc, rss_bucket_type_t btype,
int bucket, cpuset_t *cs)
{
if (bucket < 0 || bucket >= rc->rss_nbuckets) {
errno = EINVAL;
return (-1);
}
/*
* For now all buckets are the same, but eventually we'll want
* to allow administrators to set separate RSS cpusets for
* {kernel,user} {tx, rx} combinations.
*/
if (btype <= RSS_BUCKET_TYPE_NONE || btype > RSS_BUCKET_TYPE_MAX) {
errno = ENOTSUP;
return (-1);
}
CPU_ZERO(cs);
CPU_SET(rc->rss_bucket_map[bucket], cs);
return (0);
}
int
rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, void *cbdata)
{
(void) cb;
(void) cbdata;
/*
* For now there's no rebalance callback, so
* just return 0 and ignore it.
*/
return (0);
}