Date: Mon, 20 Aug 2001 16:34:13 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Bill Paul <wpaul@FreeBSD.ORG> Cc: hackers@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: Where to put new bus_dmamap_load_mbuf() code Message-ID: <Pine.BSF.4.21.0108201629490.69048-100000@beppo> In-Reply-To: <20010820232507.7518337B405@hub.freebsd.org>
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Yay! The current suggestion is fine except that each platform might have a more efficient, or even required, actual h/w mechanism for mapping mbufs. I'd also be a little concerned with the way you're overloading stuff into mbuf itself- but I'm a little shakier on this. Finally- why not make this an inline? -matt On Mon, 20 Aug 2001, Bill Paul wrote: > Okay, I decided today to write a bus_dmamap_load_mbuf() routine to > make it a little easier to convert the PCI NIC drivers to use the > busdma API. It's not the same as the NetBSD code. There are four > new functions: > > bus_dmamap_load_mbuf() > bus_dmamap_unload_mbuf() > bus_dmamap_sync_mbuf() > bus_dmamap_destroy_mbuf() > > This is more or less in keeping with the existing API, except the new > routines work exclusively on mbuf lists. The thing I need to figure > out now is where to put the code. The current suggestion from jhb is > to create the following two new files: > > sys/kern/kern_busdma.c > sys/sys/busdma.h > > The functions are machine-independent, so they shouldn't be in > sys/<arch>/<arch>/busdma_machdep.c. I mean, they could go there, but > that would just result in code duplication. If somebody has a better > suggestion, now's the time to speak up. Please let's avoid creating > another bikeshed over this. > > Current code snapshot resides at: > > http://www.freebsd.org/~wpaul/busdma > > There's also a modified version if the Adaptec "starfire" driver there > which uses the new routines. I'm running this version of the driver on > a test box in the lab right now. > > -Bill > > -- > ============================================================================= > -Bill Paul (510) 749-2329 | Senior Engineer, Master of Unix-Fu > wpaul@windriver.com | Wind River Systems > ============================================================================= > "I like zees guys. Zey are fonny guys. Just keel one of zem." -- The 3 Amigos > ============================================================================= > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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