9cac8fd2f5
mappings. Instead, they should be first mapping to an RSS bucket and then querying the RSS bucket -> CPU ID mapping to figure out the target CPU. When (if?) RSS rebalancing is implemented or some other (non round-robin) distribution of work from buckets to CPU IDs, various bits of code - both userland and kernel - will need to know how this mapping works. So, to support this: * Add a new function rss_m2bucket() - this maps an mbuf to a given bucket. Anything which is currently doing hash -> CPU work may instead wish to do hash -> bucket, and then query the bucket->cpuid map for which CPU it belongs on. Or, map it to a bucket, then re-pin that bucket -> CPU during a rebalance operation. * For userland applications which wish to exploit affinity to RSS buckets, the bucket -> CPU ID mapping is now available via a sysctl. net.inet.rss.bucket_mapping lists the bucket to CPU ID mapping via a list of bucket:cpu pairs.
99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/*-
|
|
* 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 _NETINET_IN_RSS_H_
|
|
#define _NETINET_IN_RSS_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
|
|
|
|
/*
|
|
* 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
|
|
|
|
/*
|
|
* 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_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);
|
|
|
|
/*
|
|
* Network stack interface to generate a hash for a protocol tuple.
|
|
*/
|
|
uint32_t rss_hash_ip4_4tuple(struct in_addr src, u_short srcport,
|
|
struct in_addr dst, u_short dstport);
|
|
uint32_t rss_hash_ip4_2tuple(struct in_addr src, struct in_addr dst);
|
|
uint32_t rss_hash_ip6_4tuple(struct in6_addr src, u_short srcport,
|
|
struct in6_addr dst, u_short dstport);
|
|
uint32_t rss_hash_ip6_2tuple(struct in6_addr src,
|
|
struct in6_addr dst);
|
|
|
|
/*
|
|
* 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 /* !_NETINET_IN_RSS_H_ */
|