Date: Fri, 10 Aug 2001 16:43:35 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Bill Paul <wpaul@FreeBSD.ORG> Cc: <audit@FreeBSD.ORG> Subject: Re: Need reviewers for busdma changes to ethernet driver Message-ID: <20010810164213.O64952-100000@wonky.feral.com> In-Reply-To: <20010810234002.CCEA637B405@hub.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
> > > 3. You might want to recycle rather than create/destroy mbuf tags. > > I'm not creating/destroying tags, I'm creating/destroying dma maps > (bus_dmamap_t). > > My understanding is that I need a dmamap for every buffer that I > need to send to the NIC, and in the transmit case, I might have several > buffers per packet (i.e. an mbuf list with all the packet fragments). > But I can't know ahead of time how many fragments will be in the chain, > so I can't really say "allocate this many dma maps for packet transmit." Oh, right. Sorry- I should have looked a little closer. BTW- this is the exact case that finally got Jason, after some years, to implement bus_dmaload_mbuf. If I ever resume working on wx, I'll be dma-busifying it also. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-audit" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010810164213.O64952-100000>