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 * $FreeBSD$ 27 */ 28 29 #ifndef __LIBRSS_H__ 30 #define __LIBRSS_H__ 31 32 struct rss_config { 33 int rss_ncpus; 34 int rss_nbuckets; 35 int rss_basecpu; 36 int *rss_bucket_map; 37 }; 38 39 typedef enum { 40 RSS_BUCKET_TYPE_NONE = 0, 41 RSS_BUCKET_TYPE_KERNEL_ALL = 1, 42 RSS_BUCKET_TYPE_KERNEL_TX = 2, 43 RSS_BUCKET_TYPE_KERNEL_RX = 3, 44 RSS_BUCKET_TYPE_MAX = 3, 45 } rss_bucket_type_t; 46 47 typedef void rss_bucket_rebalance_cb_t(void *arg); 48 49 /* 50 * Set the RSS bucket for the given file descriptor. 51 * 52 * This must be done before bind(). 53 */ 54 extern int rss_sock_set_rss_bucket(int fd, int af, int rss_bucket); 55 56 /* 57 * Enable or disable receiving RSS/flowid information on 58 * received UDP frames. 59 */ 60 extern int rss_sock_set_recvrss(int fd, int af, int val); 61 62 /* 63 * Fetch RSS configuration information. 64 */ 65 extern struct rss_config * rss_config_get(void); 66 67 /* 68 * Free an RSS configuration structure. 69 */ 70 extern void rss_config_free(struct rss_config *rc); 71 72 /* 73 * Return how many RSS buckets there are. 74 */ 75 extern int rss_config_get_bucket_count(struct rss_config *rc); 76 77 /* 78 * Fetch the cpuset configuration for the given RSS bucket and 79 * type. 80 */ 81 extern int rss_get_bucket_cpuset(struct rss_config *rc, 82 rss_bucket_type_t btype, int bucket, cpuset_t *cs); 83 84 /* 85 * Set a callback for bucket rebalancing. 86 * 87 * This will occur in a separate thread context rather than 88 * a signal handler. 89 */ 90 extern int rss_set_bucket_rebalance_cb(rss_bucket_rebalance_cb_t *cb, 91 void *cbdata); 92 93 #endif /* __LIBRSS_H__ */ 94