Date: Tue, 27 Aug 2013 11:38:00 +0200 From: Michael Tuexen <tuexen@freebsd.org> To: Andre Oppermann <andre@FreeBSD.org> Cc: freebsd-arm <freebsd-arm@FreeBSD.org> Subject: Re: ARM network trouble after recent mbuf changes Message-ID: <0E0536B2-2B7F-4EED-9EFD-4B9E2C2D729A@freebsd.org> In-Reply-To: <521C4CD9.4050308@freebsd.org> References: <1377550636.1111.156.camel@revolution.hippie.lan> <521BC472.7040804@freebsd.org> <521BD531.4090104@sbcglobal.net> <521C4CD9.4050308@freebsd.org>
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On Aug 27, 2013, at 8:53 AM, Andre Oppermann <andre@FreeBSD.org> wrote: > On 27.08.2013 00:22, Thomas Skibo wrote: >> On 8/26/13 2:11 PM, Andre Oppermann wrote: >>>=20 >>> Can you try this patch see check if it makes a difference on the = bitfield? >>=20 >> Actually, this works for me. But, I'm worried that somewhere else = something is going to trip over a >> struct pkthdr not being 64-bit aligned. There are several 64-bit = fields in there. >=20 > The problem is the disconnect between the definition of MLEN and MHLEN = and > the effective size/padding of struct mbuf. That's the true bug. >=20 > On LP64 all is fine. On i386 it turns out to be fine too because = doesn't > care. >=20 > MLEN and MHLEN are incorrectly derived. In fact they should be = derived from > stuct mbuf where this padding would be taking into account. However = the way > it is structured right now it that would create a circular dependency. >=20 > Please try the patch below to confirm. If it fixes your problem for = now > I'm going to commit as an immediate fix while searching for a better = long > term stable solution. >=20 > --=20 > Andre >=20 > Index: sys/mbuf.h > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- sys/mbuf.h (revision 254953) > +++ sys/mbuf.h (working copy) > @@ -94,6 +94,9 @@ > int32_t mh_len; /* amount of data in this mbuf = */ > uint32_t mh_type:8, /* type of data in this mbuf */ > mh_flags:24; /* flags; see below */ > +#if defined(__ILP32__) > + uint32_t mh_pad; /* pad to 64 bit alignment */ > +#endif > }; OK. It doesn't work. The reason is, that __ILP32__ is not defined... At lease I don't see it anywhere in the BSD stack. So I'm currently = rebuilding with #if !defined(__LP64__) instead. I'll let you know... Best regards Michael >=20 > /* > _______________________________________________ > freebsd-arm@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" >=20
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