Date: Wed, 15 Jan 2014 13:18:21 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: Nikolay Denev <nike_d@cytexbg.com>, Attila Nagy <bra@fsn.hu> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: ECMP hash keys? Message-ID: <52D6525D.50102@FreeBSD.org> In-Reply-To: <CA%2BP_MZFQU4%2B05Pk5cZ4NMZujD9vXDrV=mehN7_vz1OZ6r2-f1Q@mail.gmail.com> References: <52D5138B.8050100@fsn.hu> <CA%2BP_MZFQU4%2B05Pk5cZ4NMZujD9vXDrV=mehN7_vz1OZ6r2-f1Q@mail.gmail.com>
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On 14.01.2014 23:15, Nikolay Denev wrote: > Hi, > > Currently it's implemented using Modulo-N Hash (RFC2991), see > radix_mpath.c:rtalloc_mpath_fib() Yup. I'm going to change this to use flowid. > > And as hash the xor of source and destination IP is supplied, look for > rtalloc_mpath_fib() in ip_output.c : > > ... > #ifdef RADIX_MPATH > rtalloc_mpath_fib(ro, > ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), > inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); > #else > ... > > I've tried to hack this to use m_pkthdr.flowid if it exists, but in my > case my network cards were not setting this (vr(4) on soekris) so I You can try http://static.ipfw.ru/patches/netisr_ip_flowid.diff to get flowid values generated by netisr. > did not saw any change. Maybe my idea was completely wrong, but the > XOR of src and dst IP is 4 bytes, and this is the size of the flowid > as well. (haven't tried with FLOWTABLE enabled though). > > --Nikolay > > On Tue, Jan 14, 2014 at 10:38 AM, Attila Nagy <bra@fsn.hu> wrote: >> Hi, >> >> Does equal cost multipath take only the destination address into >> consideration when choosing the route? (I've spent only about two minutes >> reading radix_mpath.h, but I've got this impression) >> >> What would be needed to use src and dst addresses and ports -if appropriate? >> >> Thanks, >> >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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