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- /*-
- * Copyright (c) 2010-2011 Juniper Networks, Inc.
- * All rights reserved.
- *
- * This software was developed by Robert N. M. Watson under contract
- * to Juniper Networks, Inc.
- *
- * 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.
- */
- #ifndef _NET_RSS_CONFIG_H_
- #define _NET_RSS_CONFIG_H_
- #include <netinet/in.h> /* in_addr_t */
- /*
- * Supported RSS hash functions.
- */
- #define RSS_HASH_NAIVE 0x00000001 /* Poor but fast hash. */
- #define RSS_HASH_TOEPLITZ 0x00000002 /* Required by RSS. */
- #define RSS_HASH_CRC32 0x00000004 /* Future; some NICs do it. */
- #define RSS_HASH_MASK (RSS_HASH_NAIVE | RSS_HASH_TOEPLITZ)
- /*
- * Instances of struct inpcbinfo declare an RSS hash type indicating what
- * header fields are covered.
- */
- #define RSS_HASHFIELDS_NONE 0
- #define RSS_HASHFIELDS_4TUPLE 1
- #define RSS_HASHFIELDS_2TUPLE 2
- /*
- * Define RSS representations of the M_HASHTYPE_* values, representing
- * which particular bits are supported. The NICs can then use this to
- * calculate which hash types to enable and which not to enable.
- *
- * The fact that these line up with M_HASHTYPE_* is not to be relied
- * upon.
- */
- #define RSS_HASHTYPE_RSS_IPV4 (1 << 1) /* IPv4 2-tuple */
- #define RSS_HASHTYPE_RSS_TCP_IPV4 (1 << 2) /* TCPv4 4-tuple */
- #define RSS_HASHTYPE_RSS_IPV6 (1 << 3) /* IPv6 2-tuple */
- #define RSS_HASHTYPE_RSS_TCP_IPV6 (1 << 4) /* TCPv6 4-tuple */
- #define RSS_HASHTYPE_RSS_IPV6_EX (1 << 5) /* IPv6 2-tuple + ext hdrs */
- #define RSS_HASHTYPE_RSS_TCP_IPV6_EX (1 << 6) /* TCPv6 4-tiple + ext hdrs */
- #define RSS_HASHTYPE_RSS_UDP_IPV4 (1 << 7) /* IPv4 UDP 4-tuple */
- #define RSS_HASHTYPE_RSS_UDP_IPV6 (1 << 9) /* IPv6 UDP 4-tuple */
- #define RSS_HASHTYPE_RSS_UDP_IPV6_EX (1 << 10) /* IPv6 UDP 4-tuple + ext hdrs */
- /*
- * Compile-time limits on the size of the indirection table.
- */
- #define RSS_MAXBITS 7
- #define RSS_TABLE_MAXLEN (1 << RSS_MAXBITS)
- /*
- * Maximum key size used throughout. It's OK for hardware to use only the
- * first 16 bytes, which is all that's required for IPv4.
- */
- #define RSS_KEYSIZE 40
- /*
- * For RSS hash methods that do a software hash on an mbuf, the packet
- * direction (ingress / egress) is required.
- *
- * The default direction (INGRESS) is the "receive into the NIC" - ie,
- * what the hardware is hashing on.
- */
- #define RSS_HASH_PKT_INGRESS 0
- #define RSS_HASH_PKT_EGRESS 1
- /*
- * Rate limited debugging routines.
- */
- #define RSS_DEBUG(format, ...) do { \
- if (rss_debug) { \
- static struct timeval lastfail; \
- static int curfail; \
- if (ppsratecheck(&lastfail, &curfail, 5)) \
- printf("RSS (%s:%u): " format, __func__, __LINE__,\
- ##__VA_ARGS__); \
- } \
- } while (0)
- extern int rss_debug;
- /*
- * Device driver interfaces to query RSS properties that must be programmed
- * into hardware.
- */
- u_int rss_getbits(void);
- u_int rss_getbucket(u_int hash);
- u_int rss_get_indirection_to_bucket(u_int index);
- u_int rss_getcpu(u_int bucket);
- void rss_getkey(uint8_t *key);
- u_int rss_gethashalgo(void);
- u_int rss_getnumbuckets(void);
- u_int rss_getnumcpus(void);
- u_int rss_gethashconfig(void);
- /*
- * Hash calculation functions.
- */
- uint32_t rss_hash(u_int datalen, const uint8_t *data);
- /*
- * Network stack interface to query desired CPU affinity of a packet.
- */
- struct mbuf * rss_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid);
- u_int rss_hash2cpuid(uint32_t hash_val, uint32_t hash_type);
- int rss_hash2bucket(uint32_t hash_val, uint32_t hash_type,
- uint32_t *bucket_id);
- int rss_m2bucket(struct mbuf *m, uint32_t *bucket_id);
- #endif /* !_NET_RSS_CONFIG_H_ */
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