Date: Fri, 16 Nov 2001 16:13:41 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Peter Wemm <peter@wemm.org> Cc: Julian Elischer <julian@vicor-nb.com>, current@FreeBSD.ORG, net@FreeBSD.ORG, wollman@FreeBSD.ORG Subject: Re: re-entrancy and the IP stack. Message-ID: <Pine.BSF.4.21.0111161611270.6632-100000@InterJet.elischer.org> In-Reply-To: <20011117000251.A13B93811@overcee.netplex.com.au>
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Well I don't care exactly how we do it but we need to figure out a way of storing such metadata along with packets. and it needs to be queueable along with the packets.. (sounds like an mbuf to me but if you have a better idea.....) (and anyhow Garrett got rid of the 'static' uses of mbufs, not 'travelling' 'per packet' uses..) On Fri, 16 Nov 2001, Peter Wemm wrote: > Julian Elischer wrote: > [..] > > What is needed is obviously a 'per packet' storage location > > for those things, defined in a "per protocol family" manner. > > > > Luigi has already tried this scheme by defining a > > dummynet specific mbuf type that can be prepended to the > > front of packets. What I suggest is to extend this > > to defining a MT_PROTOSTORAGE. (or similar) mbuf type > > that generic networking code is educated to ignore, > > and that protocols can use to pass packet-specific state > > information from one place to another. > > Uhh.. no thanks. Whatever you do, do *NOT* abuse the mbuf system > for this. We went to a lot of trouble (well, Garrett specifically) > to rid the stacks of this obscenity. Do *NOT* generalize it and undo > it. MT_DUMMYNET must die, not be propagated elsewhere. > > If you want to have some general storage mechnaism, do *not* use mbufs > for it. > > Cheers, > -Peter > -- > Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au > "All of this is for nothing if we don't go to the stars" - JMS/B5 > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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