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Diffstat (limited to 'freebsd/sys/net/rss_config.h')
| -rw-r--r-- | freebsd/sys/net/rss_config.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/freebsd/sys/net/rss_config.h b/freebsd/sys/net/rss_config.h new file mode 100644 index 00000000..2ab32a43 --- /dev/null +++ b/freebsd/sys/net/rss_config.h @@ -0,0 +1,138 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +#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_IPV4_EX (1 << 8) /* IPv4 UDP 4-tuple + ext hdrs */ +#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_ */ |