From owner-freebsd-net  Fri Aug  9 14:42: 6 2002
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From: "Sam Leffler (at Usenix)" <sam@usenix.org>
To: "Andrew Gallatin" <gallatin@cs.duke.edu>,
	"Bosko Milekic" <bmilekic@unixdaemons.com>
Cc: <ken@FreeBSD.ORG>, <freebsd-net@FreeBSD.ORG>
References: <20020809151627.A88180@unixdaemons.com><15700.9669.885383.727182@grasshopper.cs.duke.edu><20020809164136.A88798@unixdaemons.com> <15700.13575.470677.723138@grasshopper.cs.duke.edu>
Subject: Re: Jumbo Clusters in mb_alloc
Date: Fri, 9 Aug 2002 14:41:47 -0700
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> Ideally, I'd love to see an interface where I call a function
> dma_map_mbuf_chain (m, ...) and get back an array of DMA addresses.
> Hmm.. WWNBD (what would NetBSD do..).
>
> Ah, yes:
>
> bus_dmamap_load_mbuf(sc->sc_dmat, dmamap, m0,
>                     BUS_DMA_WRITE|BUS_DMA_NOWAIT) != 0) {
>                         MGETHDR(m, M_DONTWAIT, MT_DATA);
>
> Methinks its high time we adopted this interface.

I use bus_dmamap_load_mbuf (and _uio) in the crypto drivers I import from
openbsd.  I think it would be good to adopt this interface.

    Sam


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