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