07b4e38313
The rss_key[] array in netinet/in_rss.c has the bytes in incorrect order. This results in the RSS test vectors in the Microsft RSS spec and Intel NIC specs giving incorrect results, and making it difficult to verify correct hash operation when RSS functionality is added to new NICs. CR: https://phabric.freebsd.org/D516 Reviewed by: adrian
631 lines
16 KiB
C
631 lines
16 KiB
C
/*-
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* Copyright (c) 2010-2011 Juniper Networks, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson under contract
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* to Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include "opt_pcbgroup.h"
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#ifndef PCBGROUP
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#error "options RSS depends on options PCBGROUP"
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#endif
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/priv.h>
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#include <sys/kernel.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <sys/sbuf.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/netisr.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_rss.h>
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#include <netinet/in_var.h>
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#include <netinet/toeplitz.h>
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/*-
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* Operating system parts of receiver-side scaling (RSS), which allows
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* network cards to direct flows to particular receive queues based on hashes
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* of header tuples. This implementation aligns RSS buckets with connection
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* groups at the TCP/IP layer, so each bucket is associated with exactly one
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* group. As a result, the group lookup structures (and lock) should have an
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* effective affinity with exactly one CPU.
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*
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* Network device drivers needing to configure RSS will query this framework
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* for parameters, such as the current RSS key, hashing policies, number of
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* bits, and indirection table mapping hashes to buckets and CPUs. They may
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* provide their own supplementary information, such as queue<->CPU bindings.
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* It is the responsibility of the network device driver to inject packets
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* into the stack on as close to the right CPU as possible, if playing by RSS
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* rules.
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*
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* TODO:
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*
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* - Synchronization for rss_key and other future-configurable parameters.
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* - Event handler drivers can register to pick up RSS configuration changes.
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* - Should we allow rss_basecpu to be configured?
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* - Randomize key on boot.
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* - IPv6 support.
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* - Statistics on how often there's a misalignment between hardware
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* placement and pcbgroup expectations.
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*/
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SYSCTL_NODE(_net_inet, OID_AUTO, rss, CTLFLAG_RW, 0, "Receive-side steering");
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/*
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* Toeplitz is the only required hash function in the RSS spec, so use it by
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* default.
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*/
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static u_int rss_hashalgo = RSS_HASH_TOEPLITZ;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, hashalgo, CTLFLAG_RDTUN, &rss_hashalgo, 0,
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"RSS hash algorithm");
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/*
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* Size of the indirection table; at most 128 entries per the RSS spec. We
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* size it to at least 2 times the number of CPUs by default to allow useful
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* rebalancing. If not set explicitly with a loader tunable, we tune based
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* on the number of CPUs present.
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*
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* XXXRW: buckets might be better to use for the tunable than bits.
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*/
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static u_int rss_bits;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, bits, CTLFLAG_RDTUN, &rss_bits, 0,
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"RSS bits");
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static u_int rss_mask;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, mask, CTLFLAG_RD, &rss_mask, 0,
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"RSS mask");
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static const u_int rss_maxbits = RSS_MAXBITS;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, maxbits, CTLFLAG_RD,
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__DECONST(int *, &rss_maxbits), 0, "RSS maximum bits");
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/*
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* RSS's own count of the number of CPUs it could be using for processing.
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* Bounded to 64 by RSS constants.
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*/
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static u_int rss_ncpus;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, ncpus, CTLFLAG_RD, &rss_ncpus, 0,
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"Number of CPUs available to RSS");
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#define RSS_MAXCPUS (1 << (RSS_MAXBITS - 1))
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static const u_int rss_maxcpus = RSS_MAXCPUS;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, maxcpus, CTLFLAG_RD,
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__DECONST(int *, &rss_maxcpus), 0, "RSS maximum CPUs that can be used");
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/*
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* Variable exists just for reporting rss_bits in a user-friendly way.
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*/
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static u_int rss_buckets;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, buckets, CTLFLAG_RD, &rss_buckets, 0,
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"RSS buckets");
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/*
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* Base CPU number; devices will add this to all CPU numbers returned by the
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* RSS indirection table. Currently unmodifable in FreeBSD.
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*/
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static const u_int rss_basecpu;
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SYSCTL_INT(_net_inet_rss, OID_AUTO, basecpu, CTLFLAG_RD,
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__DECONST(int *, &rss_basecpu), 0, "RSS base CPU");
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/*
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* RSS secret key, intended to prevent attacks on load-balancing. Its
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* effectiveness may be limited by algorithm choice and available entropy
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* during the boot.
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*
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* XXXRW: And that we don't randomize it yet!
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*
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* This is the default Microsoft RSS specification key which is also
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* the Chelsio T5 firmware default key.
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*/
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static uint8_t rss_key[RSS_KEYSIZE] = {
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0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
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0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
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0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
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0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
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0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa,
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};
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/*
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* RSS hash->CPU table, which maps hashed packet headers to particular CPUs.
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* Drivers may supplement this table with a seperate CPU<->queue table when
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* programming devices.
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*/
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struct rss_table_entry {
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uint8_t rte_cpu; /* CPU affinity of bucket. */
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};
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static struct rss_table_entry rss_table[RSS_TABLE_MAXLEN];
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static void
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rss_init(__unused void *arg)
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{
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u_int i;
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u_int cpuid;
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/*
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* Validate tunables, coerce to sensible values.
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*/
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switch (rss_hashalgo) {
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case RSS_HASH_TOEPLITZ:
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case RSS_HASH_NAIVE:
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break;
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default:
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printf("%s: invalid RSS hashalgo %u, coercing to %u",
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__func__, rss_hashalgo, RSS_HASH_TOEPLITZ);
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rss_hashalgo = RSS_HASH_TOEPLITZ;
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}
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/*
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* Count available CPUs.
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*
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* XXXRW: Note incorrect assumptions regarding contiguity of this set
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* elsewhere.
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*/
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rss_ncpus = 0;
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for (i = 0; i <= mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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rss_ncpus++;
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}
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if (rss_ncpus > RSS_MAXCPUS)
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rss_ncpus = RSS_MAXCPUS;
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/*
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* Tune RSS table entries to be no less than 2x the number of CPUs
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* -- unless we're running uniprocessor, in which case there's not
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* much point in having buckets to rearrange for load-balancing!
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*/
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if (rss_ncpus > 1) {
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if (rss_bits == 0)
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rss_bits = fls(rss_ncpus - 1) + 1;
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/*
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* Microsoft limits RSS table entries to 128, so apply that
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* limit to both auto-detected CPU counts and user-configured
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* ones.
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*/
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if (rss_bits == 0 || rss_bits > RSS_MAXBITS) {
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printf("%s: RSS bits %u not valid, coercing to %u",
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__func__, rss_bits, RSS_MAXBITS);
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rss_bits = RSS_MAXBITS;
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}
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/*
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* Figure out how many buckets to use; warn if less than the
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* number of configured CPUs, although this is not a fatal
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* problem.
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*/
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rss_buckets = (1 << rss_bits);
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if (rss_buckets < rss_ncpus)
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printf("%s: WARNING: rss_buckets (%u) less than "
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"rss_ncpus (%u)\n", __func__, rss_buckets,
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rss_ncpus);
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rss_mask = rss_buckets - 1;
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} else {
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rss_bits = 0;
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rss_buckets = 1;
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rss_mask = 0;
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}
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/*
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* Set up initial CPU assignments: round-robin by default.
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*/
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cpuid = CPU_FIRST();
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for (i = 0; i < rss_buckets; i++) {
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rss_table[i].rte_cpu = cpuid;
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cpuid = CPU_NEXT(cpuid);
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}
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/*
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* Randomize rrs_key.
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*
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* XXXRW: Not yet. If nothing else, will require an rss_isbadkey()
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* loop to check for "bad" RSS keys.
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*/
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}
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SYSINIT(rss_init, SI_SUB_SOFTINTR, SI_ORDER_SECOND, rss_init, NULL);
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static uint32_t
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rss_naive_hash(u_int keylen, const uint8_t *key, u_int datalen,
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const uint8_t *data)
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{
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uint32_t v;
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u_int i;
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v = 0;
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for (i = 0; i < keylen; i++)
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v += key[i];
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for (i = 0; i < datalen; i++)
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v += data[i];
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return (v);
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}
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static uint32_t
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rss_hash(u_int datalen, const uint8_t *data)
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{
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switch (rss_hashalgo) {
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case RSS_HASH_TOEPLITZ:
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return (toeplitz_hash(sizeof(rss_key), rss_key, datalen,
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data));
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case RSS_HASH_NAIVE:
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return (rss_naive_hash(sizeof(rss_key), rss_key, datalen,
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data));
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default:
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panic("%s: unsupported/unknown hashalgo %d", __func__,
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rss_hashalgo);
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}
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}
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/*
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* Hash an IPv4 2-tuple.
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*/
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uint32_t
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rss_hash_ip4_2tuple(struct in_addr src, struct in_addr dst)
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{
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uint8_t data[sizeof(src) + sizeof(dst)];
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u_int datalen;
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datalen = 0;
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bcopy(&src, &data[datalen], sizeof(src));
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datalen += sizeof(src);
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bcopy(&dst, &data[datalen], sizeof(dst));
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datalen += sizeof(dst);
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return (rss_hash(datalen, data));
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}
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/*
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* Hash an IPv4 4-tuple.
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*/
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uint32_t
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rss_hash_ip4_4tuple(struct in_addr src, u_short srcport, struct in_addr dst,
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u_short dstport)
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{
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uint8_t data[sizeof(src) + sizeof(dst) + sizeof(srcport) +
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sizeof(dstport)];
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u_int datalen;
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datalen = 0;
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bcopy(&src, &data[datalen], sizeof(src));
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datalen += sizeof(src);
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bcopy(&dst, &data[datalen], sizeof(dst));
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datalen += sizeof(dst);
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bcopy(&srcport, &data[datalen], sizeof(srcport));
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datalen += sizeof(srcport);
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bcopy(&dstport, &data[datalen], sizeof(dstport));
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datalen += sizeof(dstport);
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return (rss_hash(datalen, data));
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}
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#ifdef INET6
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/*
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* Hash an IPv6 2-tuple.
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*/
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uint32_t
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rss_hash_ip6_2tuple(struct in6_addr src, struct in6_addr dst)
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{
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uint8_t data[sizeof(src) + sizeof(dst)];
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u_int datalen;
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datalen = 0;
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bcopy(&src, &data[datalen], sizeof(src));
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datalen += sizeof(src);
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bcopy(&dst, &data[datalen], sizeof(dst));
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datalen += sizeof(dst);
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return (rss_hash(datalen, data));
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}
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/*
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* Hash an IPv6 4-tuple.
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*/
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uint32_t
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rss_hash_ip6_4tuple(struct in6_addr src, u_short srcport,
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struct in6_addr dst, u_short dstport)
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{
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uint8_t data[sizeof(src) + sizeof(dst) + sizeof(srcport) +
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sizeof(dstport)];
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u_int datalen;
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datalen = 0;
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bcopy(&src, &data[datalen], sizeof(src));
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datalen += sizeof(src);
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bcopy(&dst, &data[datalen], sizeof(dst));
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datalen += sizeof(dst);
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bcopy(&srcport, &data[datalen], sizeof(srcport));
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datalen += sizeof(srcport);
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bcopy(&dstport, &data[datalen], sizeof(dstport));
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datalen += sizeof(dstport);
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return (rss_hash(datalen, data));
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}
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#endif /* INET6 */
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/*
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* Query the number of RSS bits in use.
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*/
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u_int
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rss_getbits(void)
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{
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return (rss_bits);
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}
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/*
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* Query the RSS bucket associated with an RSS hash.
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*/
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u_int
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rss_getbucket(u_int hash)
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{
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return (hash & rss_mask);
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}
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/*
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* Query the RSS layer bucket associated with the given
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* entry in the RSS hash space.
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*
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* The RSS indirection table is 0 .. rss_buckets-1,
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* covering the low 'rss_bits' of the total 128 slot
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* RSS indirection table. So just mask off rss_bits and
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* return that.
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*
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* NIC drivers can then iterate over the 128 slot RSS
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* indirection table and fetch which RSS bucket to
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* map it to. This will typically be a CPU queue
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*/
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u_int
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rss_get_indirection_to_bucket(u_int index)
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{
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return (index & rss_mask);
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}
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/*
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* Query the RSS CPU associated with an RSS bucket.
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*/
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u_int
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rss_getcpu(u_int bucket)
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{
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return (rss_table[bucket].rte_cpu);
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}
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/*
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* netisr CPU affinity lookup given just the hash and hashtype.
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*/
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u_int
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rss_hash2cpuid(uint32_t hash_val, uint32_t hash_type)
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{
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switch (hash_type) {
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case M_HASHTYPE_RSS_IPV4:
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case M_HASHTYPE_RSS_TCP_IPV4:
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case M_HASHTYPE_RSS_UDP_IPV4:
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case M_HASHTYPE_RSS_IPV6:
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case M_HASHTYPE_RSS_TCP_IPV6:
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case M_HASHTYPE_RSS_UDP_IPV6:
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return (rss_getcpu(rss_getbucket(hash_val)));
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default:
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return (NETISR_CPUID_NONE);
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}
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}
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/*
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* Query the RSS bucket associated with the given hash value and
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* type.
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*/
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int
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rss_hash2bucket(uint32_t hash_val, uint32_t hash_type, uint32_t *bucket_id)
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{
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switch (hash_type) {
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case M_HASHTYPE_RSS_IPV4:
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case M_HASHTYPE_RSS_TCP_IPV4:
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case M_HASHTYPE_RSS_UDP_IPV4:
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case M_HASHTYPE_RSS_IPV6:
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case M_HASHTYPE_RSS_TCP_IPV6:
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case M_HASHTYPE_RSS_UDP_IPV6:
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*bucket_id = rss_getbucket(hash_val);
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return (0);
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default:
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return (-1);
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}
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}
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/*
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* netisr CPU affinity lookup routine for use by protocols.
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*/
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struct mbuf *
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rss_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid)
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{
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M_ASSERTPKTHDR(m);
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*cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
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return (m);
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}
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int
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rss_m2bucket(struct mbuf *m, uint32_t *bucket_id)
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{
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M_ASSERTPKTHDR(m);
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return(rss_hash2bucket(m->m_pkthdr.flowid, M_HASHTYPE_GET(m),
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bucket_id));
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}
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/*
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* Query the RSS hash algorithm.
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*/
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u_int
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rss_gethashalgo(void)
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{
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|
return (rss_hashalgo);
|
|
}
|
|
|
|
/*
|
|
* Query the current RSS key; likely to be used by device drivers when
|
|
* configuring hardware RSS. Caller must pass an array of size RSS_KEYSIZE.
|
|
*
|
|
* XXXRW: Perhaps we should do the accept-a-length-and-truncate thing?
|
|
*/
|
|
void
|
|
rss_getkey(uint8_t *key)
|
|
{
|
|
|
|
bcopy(rss_key, key, sizeof(rss_key));
|
|
}
|
|
|
|
/*
|
|
* Query the number of buckets; this may be used by both network device
|
|
* drivers, which will need to populate hardware shadows of the software
|
|
* indirection table, and the network stack itself (such as when deciding how
|
|
* many connection groups to allocate).
|
|
*/
|
|
u_int
|
|
rss_getnumbuckets(void)
|
|
{
|
|
|
|
return (rss_buckets);
|
|
}
|
|
|
|
/*
|
|
* Query the number of CPUs in use by RSS; may be useful to device drivers
|
|
* trying to figure out how to map a larger number of CPUs into a smaller
|
|
* number of receive queues.
|
|
*/
|
|
u_int
|
|
rss_getnumcpus(void)
|
|
{
|
|
|
|
return (rss_ncpus);
|
|
}
|
|
|
|
/*
|
|
* Return the supported RSS hash configuration.
|
|
*
|
|
* NICs should query this to determine what to configure in their redirection
|
|
* matching table.
|
|
*/
|
|
u_int
|
|
rss_gethashconfig(void)
|
|
{
|
|
/* Return 4-tuple for TCP; 2-tuple for others */
|
|
/*
|
|
* UDP may fragment more often than TCP and thus we'll end up with
|
|
* NICs returning 2-tuple fragments.
|
|
* udp_init() and udplite_init() both currently initialise things
|
|
* as 2-tuple.
|
|
* So for now disable UDP 4-tuple hashing until all of the other
|
|
* pieces are in place.
|
|
*/
|
|
return (
|
|
RSS_HASHTYPE_RSS_IPV4
|
|
| RSS_HASHTYPE_RSS_TCP_IPV4
|
|
| RSS_HASHTYPE_RSS_IPV6
|
|
| RSS_HASHTYPE_RSS_TCP_IPV6
|
|
| RSS_HASHTYPE_RSS_IPV6_EX
|
|
| RSS_HASHTYPE_RSS_TCP_IPV6_EX
|
|
#if 0
|
|
| RSS_HASHTYPE_RSS_UDP_IPV4
|
|
| RSS_HASHTYPE_RSS_UDP_IPV4_EX
|
|
| RSS_HASHTYPE_RSS_UDP_IPV6
|
|
| RSS_HASHTYPE_RSS_UDP_IPV6_EX
|
|
#endif
|
|
);
|
|
}
|
|
|
|
/*
|
|
* XXXRW: Confirm that sysctl -a won't dump this keying material, don't want
|
|
* it appearing in debugging output unnecessarily.
|
|
*/
|
|
static int
|
|
sysctl_rss_key(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
uint8_t temp_rss_key[RSS_KEYSIZE];
|
|
int error;
|
|
|
|
error = priv_check(req->td, PRIV_NETINET_HASHKEY);
|
|
if (error)
|
|
return (error);
|
|
|
|
bcopy(rss_key, temp_rss_key, sizeof(temp_rss_key));
|
|
error = sysctl_handle_opaque(oidp, temp_rss_key,
|
|
sizeof(temp_rss_key), req);
|
|
if (error)
|
|
return (error);
|
|
if (req->newptr != NULL) {
|
|
/* XXXRW: Not yet. */
|
|
return (EINVAL);
|
|
}
|
|
return (0);
|
|
}
|
|
SYSCTL_PROC(_net_inet_rss, OID_AUTO, key,
|
|
CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, sysctl_rss_key,
|
|
"", "RSS keying material");
|
|
|
|
static int
|
|
sysctl_rss_bucket_mapping(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sbuf *sb;
|
|
int error;
|
|
int i;
|
|
|
|
error = 0;
|
|
error = sysctl_wire_old_buffer(req, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
sb = sbuf_new_for_sysctl(NULL, NULL, 512, req);
|
|
if (sb == NULL)
|
|
return (ENOMEM);
|
|
for (i = 0; i < rss_buckets; i++) {
|
|
sbuf_printf(sb, "%s%d:%d", i == 0 ? "" : " ",
|
|
i,
|
|
rss_getcpu(i));
|
|
}
|
|
error = sbuf_finish(sb);
|
|
sbuf_delete(sb);
|
|
|
|
return (error);
|
|
}
|
|
SYSCTL_PROC(_net_inet_rss, OID_AUTO, bucket_mapping,
|
|
CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
|
|
sysctl_rss_bucket_mapping, "", "RSS bucket -> CPU mapping");
|