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/param.h>
28#include <sys/types.h>
29#include <sys/socket.h>
30#include <sys/cpuset.h>
31#include <sys/sysctl.h>
32
33#include <stdio.h>
34#include <stdlib.h>
35#include <unistd.h>
36#include <strings.h>
37#include <err.h>
38#include <fcntl.h>
39#include <string.h>
40#include <errno.h>
41
42#include <netinet/in.h>
43
44#include "librss.h"
45
46int
47rss_sock_set_recvrss(int fd, int af, int val)
48{
49	int opt, retval;
50	socklen_t optlen;
51	int f1, f2, p;
52
53	switch (af) {
54	case AF_INET:
55		p = IPPROTO_IP;
56		f1 = IP_RECVFLOWID;
57		f2 = IP_RECVRSSBUCKETID;
58		break;
59	case AF_INET6:
60		p = IPPROTO_IPV6;
61		f1 = IPV6_RECVFLOWID;
62		f2 = IPV6_RECVRSSBUCKETID;
63		break;
64	default:
65		return (-1);
66	}
67
68	/* Enable/disable flowid */
69	opt = val;
70	optlen = sizeof(opt);
71	retval = setsockopt(fd, p, f1, &opt, optlen);
72	if (retval < 0) {
73		warn("%s: setsockopt(IP_RECVFLOWID)", __func__);
74		return (-1);
75	}
76
77	/* Enable/disable RSS bucket reception */
78	opt = val;
79	optlen = sizeof(opt);
80	retval = setsockopt(fd, p, f2, &opt, optlen);
81	if (retval < 0) {
82		warn("%s: setsockopt(IP_RECVRSSBUCKETID)", __func__);
83		return (-1);
84	}
85
86	return (0);
87}
88
89static int
90rss_getsysctlint(const char *s)
91{
92	int val, retval;
93	size_t rlen;
94
95	rlen = sizeof(int);
96	retval = sysctlbyname(s, &val, &rlen, NULL, 0);
97	if (retval < 0) {
98		warn("sysctlbyname (%s)", s);
99		return (-1);
100	}
101
102	return (val);
103}
104
105static int
106rss_getbucketmap(int *bucket_map, int nbuckets)
107{
108	/* XXX I'm lazy; so static string it is */
109	char bstr[2048];
110	int retval;
111	size_t rlen;
112	char *s, *ss;
113	int r, b, c;
114
115	/* Paranoia */
116	memset(bstr, '\0', sizeof(bstr));
117
118	rlen = sizeof(bstr) - 1;
119	retval = sysctlbyname("net.inet.rss.bucket_mapping", bstr, &rlen, NULL, 0);
120	if (retval < 0) {
121		warn("sysctlbyname (net.inet.rss.bucket_mapping)");
122		return (-1);
123	}
124
125	ss = bstr;
126	while ((s = strsep(&ss, " ")) != NULL) {
127		r = sscanf(s, "%d:%d", &b, &c);
128		if (r != 2) {
129			fprintf(stderr, "%s: string (%s) not parsable\n",
130			    __func__,
131			    s);
132			return (-1);
133		}
134		if (b > nbuckets) {
135			fprintf(stderr, "%s: bucket %d > nbuckets %d\n",
136			    __func__,
137			    b,
138			    nbuckets);
139			return (-1);
140		}
141		/* XXX no maxcpu check */
142		bucket_map[b] = c;
143	}
144	return (0);
145}
146
147struct rss_config *
148rss_config_get(void)
149{
150	struct rss_config *rc = NULL;
151
152	rc = calloc(1, sizeof(*rc));
153	if (rc == NULL) {
154		warn("%s: calloc", __func__);
155		goto error;
156	}
157
158	rc->rss_ncpus = rss_getsysctlint("net.inet.rss.ncpus");
159	if (rc->rss_ncpus < 0) {
160		fprintf(stderr, "%s: couldn't fetch net.inet.rss.ncpus\n", __func__);
161		goto error;
162	}
163
164	rc->rss_nbuckets = rss_getsysctlint("net.inet.rss.buckets");
165	if (rc->rss_nbuckets < 0) {
166		fprintf(stderr, "%s: couldn't fetch net.inet.rss.nbuckets\n", __func__);
167		goto error;
168	}
169
170	rc->rss_basecpu = rss_getsysctlint("net.inet.rss.basecpu");
171	if (rc->rss_basecpu< 0) {
172		fprintf(stderr, "%s: couldn't fetch net.inet.rss.basecpu\n", __func__);
173		goto error;
174	}
175
176	rc->rss_bucket_map = calloc(rc->rss_nbuckets, sizeof(int));
177	if (rc->rss_bucket_map == NULL) {
178		warn("%s: calloc (rss buckets; %d entries)", __func__, rc->rss_nbuckets);
179		goto error;
180	}
181
182	if (rss_getbucketmap(rc->rss_bucket_map, rc->rss_nbuckets) != 0) {
183		fprintf(stderr, "%s: rss_getbucketmap failed\n", __func__);
184		goto error;
185	}
186
187	return (rc);
188
189error:
190	if (rc != NULL) {
191		free(rc->rss_bucket_map);
192		free(rc);
193	}
194	return (NULL);
195}
196
197void
198rss_config_free(struct rss_config *rc)
199{
200
201	if ((rc != NULL) && rc->rss_bucket_map)
202		free(rc->rss_bucket_map);
203	if (rc != NULL)
204		free(rc);
205}
206
207int
208rss_config_get_bucket_count(struct rss_config *rc)
209{
210
211	if (rc == NULL)
212		return (-1);
213	return (rc->rss_nbuckets);
214}
215
216int
217rss_get_bucket_cpuset(struct rss_config *rc, rss_bucket_type_t btype,
218    int bucket, cpuset_t *cs)
219{
220
221	if (bucket < 0 || bucket >= rc->rss_nbuckets) {
222		errno = EINVAL;
223		return (-1);
224	}
225
226	/*
227	 * For now all buckets are the same, but eventually we'll want
228	 * to allow administrators to set separate RSS cpusets for
229	 * {kernel,user} {tx, rx} combinations.
230	 */
231	if (btype <= RSS_BUCKET_TYPE_NONE || btype > RSS_BUCKET_TYPE_MAX) {
232		errno = ENOTSUP;
233		return (-1);
234	}
235
236	CPU_ZERO(cs);
237	CPU_SET(rc->rss_bucket_map[bucket], cs);
238
239	return (0);
240}
241
242int
243rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, void *cbdata)
244{
245
246	(void) cb;
247	(void) cbdata;
248
249	/*
250	 * For now there's no rebalance callback, so
251	 * just return 0 and ignore it.
252	 */
253	return (0);
254}
255