1 /*- 2 * Copyright (c) 2010-2011 Juniper Networks, Inc. 3 * All rights reserved. 4 * 5 * This software was developed by Robert N. M. Watson under contract 6 * to Juniper Networks, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #ifndef _NET_RSS_CONFIG_H_ 33 #define _NET_RSS_CONFIG_H_ 34 35 #include <netinet/in.h> /* in_addr_t */ 36 37 /* 38 * Supported RSS hash functions. 39 */ 40 #define RSS_HASH_NAIVE 0x00000001 /* Poor but fast hash. */ 41 #define RSS_HASH_TOEPLITZ 0x00000002 /* Required by RSS. */ 42 #define RSS_HASH_CRC32 0x00000004 /* Future; some NICs do it. */ 43 44 #define RSS_HASH_MASK (RSS_HASH_NAIVE | RSS_HASH_TOEPLITZ) 45 46 /* 47 * Instances of struct inpcbinfo declare an RSS hash type indicating what 48 * header fields are covered. 49 */ 50 #define RSS_HASHFIELDS_NONE 0 51 #define RSS_HASHFIELDS_4TUPLE 1 52 #define RSS_HASHFIELDS_2TUPLE 2 53 54 /* 55 * Define RSS representations of the M_HASHTYPE_* values, representing 56 * which particular bits are supported. The NICs can then use this to 57 * calculate which hash types to enable and which not to enable. 58 * 59 * The fact that these line up with M_HASHTYPE_* is not to be relied 60 * upon. 61 */ 62 #define RSS_HASHTYPE_RSS_IPV4 (1 << 1) /* IPv4 2-tuple */ 63 #define RSS_HASHTYPE_RSS_TCP_IPV4 (1 << 2) /* TCPv4 4-tuple */ 64 #define RSS_HASHTYPE_RSS_IPV6 (1 << 3) /* IPv6 2-tuple */ 65 #define RSS_HASHTYPE_RSS_TCP_IPV6 (1 << 4) /* TCPv6 4-tuple */ 66 #define RSS_HASHTYPE_RSS_IPV6_EX (1 << 5) /* IPv6 2-tuple + ext hdrs */ 67 #define RSS_HASHTYPE_RSS_TCP_IPV6_EX (1 << 6) /* TCPv6 4-tiple + ext hdrs */ 68 #define RSS_HASHTYPE_RSS_UDP_IPV4 (1 << 7) /* IPv4 UDP 4-tuple */ 69 #define RSS_HASHTYPE_RSS_UDP_IPV6 (1 << 9) /* IPv6 UDP 4-tuple */ 70 #define RSS_HASHTYPE_RSS_UDP_IPV6_EX (1 << 10) /* IPv6 UDP 4-tuple + ext hdrs */ 71 72 /* 73 * Compile-time limits on the size of the indirection table. 74 */ 75 #define RSS_MAXBITS 7 76 #define RSS_TABLE_MAXLEN (1 << RSS_MAXBITS) 77 78 /* 79 * Maximum key size used throughout. It's OK for hardware to use only the 80 * first 16 bytes, which is all that's required for IPv4. 81 */ 82 #define RSS_KEYSIZE 40 83 84 /* 85 * For RSS hash methods that do a software hash on an mbuf, the packet 86 * direction (ingress / egress) is required. 87 * 88 * The default direction (INGRESS) is the "receive into the NIC" - ie, 89 * what the hardware is hashing on. 90 */ 91 #define RSS_HASH_PKT_INGRESS 0 92 #define RSS_HASH_PKT_EGRESS 1 93 94 /* 95 * Rate limited debugging routines. 96 */ 97 #define RSS_DEBUG(format, ...) do { \ 98 if (rss_debug) { \ 99 static struct timeval lastfail; \ 100 static int curfail; \ 101 if (ppsratecheck(&lastfail, &curfail, 5)) \ 102 printf("RSS (%s:%u): " format, __func__, __LINE__,\ 103 ##__VA_ARGS__); \ 104 } \ 105 } while (0) 106 107 extern int rss_debug; 108 109 /* 110 * Device driver interfaces to query RSS properties that must be programmed 111 * into hardware. 112 */ 113 u_int rss_getbits(void); 114 u_int rss_getbucket(u_int hash); 115 u_int rss_get_indirection_to_bucket(u_int index); 116 u_int rss_getcpu(u_int bucket); 117 void rss_getkey(uint8_t *key); 118 u_int rss_gethashalgo(void); 119 u_int rss_getnumbuckets(void); 120 u_int rss_getnumcpus(void); 121 u_int rss_gethashconfig(void); 122 123 /* 124 * Hash calculation functions. 125 */ 126 uint32_t rss_hash(u_int datalen, const uint8_t *data); 127 128 /* 129 * Network stack interface to query desired CPU affinity of a packet. 130 */ 131 struct mbuf * rss_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid); 132 u_int rss_hash2cpuid(uint32_t hash_val, uint32_t hash_type); 133 int rss_hash2bucket(uint32_t hash_val, uint32_t hash_type, 134 uint32_t *bucket_id); 135 int rss_m2bucket(struct mbuf *m, uint32_t *bucket_id); 136 137 #endif /* !_NET_RSS_CONFIG_H_ */ 138