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b2bdc62a95
bits. The motivation here is to eventually teach netisr and potentially other networking subsystems a bit more about how RSS work queues / buckets are configured so things have a hope of auto-configuring in the future. * net/rss_config.[ch] takes care of the generic bits for doing configuration, hash function selection, etc; * topelitz.[ch] is now in net/ rather than netinet/; * (and would be in libkern if it didn't directly include RSS_KEYSIZE; that's a later thing to fix up.) * netinet/in_rss.[ch] now just contains the IPv4 specific methods; * and netinet/in6_rss.[ch] now just contains the IPv6 specific methods. This should have no functional impact on anyone currently using the RSS support. Differential Revision: D1383 Reviewed by: gnn, jfv (intel driver bits)
151 lines
4.4 KiB
C
151 lines
4.4 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_rss.h"
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <net/rss_config.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#ifdef INET6
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#include <netinet6/in6_pcb.h>
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#include <netinet6/in6_rss.h>
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#endif /* INET6 */
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/*
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* Given a hash of whatever the covered tuple might be, return a pcbgroup
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* index. Where RSS is supported, try to align bucket selection with RSS CPU
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* affinity strategy.
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*/
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static __inline u_int
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in6_pcbgroup_getbucket(struct inpcbinfo *pcbinfo, uint32_t hash)
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{
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#ifdef RSS
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return (rss_getbucket(hash));
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#else
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return (hash % pcbinfo->ipi_npcbgroups);
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#endif
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}
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/*
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* Map a (hashtype, hash) tuple into a connection group, or NULL if the hash
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* information is insufficient to identify the pcbgroup. This might occur if
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* a TCP packet turnsup with a 2-tuple hash, or if an RSS hash is present but
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* RSS is not compiled into the kernel.
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*/
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struct inpcbgroup *
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in6_pcbgroup_byhash(struct inpcbinfo *pcbinfo, u_int hashtype, uint32_t hash)
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{
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#ifdef RSS
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if ((pcbinfo->ipi_hashfields == IPI_HASHFIELDS_4TUPLE &&
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hashtype == M_HASHTYPE_RSS_TCP_IPV6) ||
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(pcbinfo->ipi_hashfields == IPI_HASHFIELDS_4TUPLE &&
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hashtype == M_HASHTYPE_RSS_UDP_IPV6) ||
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(pcbinfo->ipi_hashfields == IPI_HASHFIELDS_2TUPLE &&
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hashtype == M_HASHTYPE_RSS_IPV6))
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return (&pcbinfo->ipi_pcbgroups[
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in6_pcbgroup_getbucket(pcbinfo, hash)]);
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#endif
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return (NULL);
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}
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struct inpcbgroup *
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in6_pcbgroup_bymbuf(struct inpcbinfo *pcbinfo, struct mbuf *m)
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{
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return (in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
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m->m_pkthdr.flowid));
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}
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struct inpcbgroup *
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in6_pcbgroup_bytuple(struct inpcbinfo *pcbinfo, const struct in6_addr *laddrp,
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u_short lport, const struct in6_addr *faddrp, u_short fport)
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{
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uint32_t hash;
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/*
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* RSS note: we pass foreign addr/port as source, and local addr/port
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* as destination, as we want to align with what the hardware is
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* doing.
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*/
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switch (pcbinfo->ipi_hashfields) {
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case IPI_HASHFIELDS_4TUPLE:
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#ifdef RSS
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hash = rss_hash_ip6_4tuple(faddrp, fport, laddrp, lport);
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#else
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hash = faddrp->s6_addr32[3] ^ fport;
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#endif
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break;
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case IPI_HASHFIELDS_2TUPLE:
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#ifdef RSS
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hash = rss_hash_ip6_2tuple(faddrp, laddrp);
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#else
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hash = faddrp->s6_addr32[3] ^ laddrp->s6_addr32[3];
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#endif
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break;
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default:
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hash = 0;
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}
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return (&pcbinfo->ipi_pcbgroups[in6_pcbgroup_getbucket(pcbinfo,
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hash)]);
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}
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struct inpcbgroup *
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in6_pcbgroup_byinpcb(struct inpcb *inp)
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{
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#ifdef RSS
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/*
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* Listen sockets with INP_RSS_BUCKET_SET set have a pre-determined
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* RSS bucket and thus we should use this pcbgroup, rather than
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* using a tuple or hash.
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*
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* XXX should verify that there's actually pcbgroups and inp_rss_listen_bucket
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* fits in that!
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*/
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if (inp->inp_flags2 & INP_RSS_BUCKET_SET)
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return (&inp->inp_pcbinfo->ipi_pcbgroups[inp->inp_rss_listen_bucket]);
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#endif
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return (in6_pcbgroup_bytuple(inp->inp_pcbinfo, &inp->in6p_laddr,
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inp->inp_lport, &inp->in6p_faddr, inp->inp_fport));
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}
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