Date: Thu, 09 May 2002 17:31:46 +0530 From: shubhamr <shubhamr@malkauns.nsc.com> To: "questions@FreeBSD.ORG" <questions@freebsd.org> Subject: mbuf doubt - please help urgent. Message-ID: <3CDA652A.930BB5BF@malkauns.nsc.com>
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Hi , I see in one of the sample drivers for the NIC that for transmission,"mtod" and "vtophys" has been used. But why have not they considered the case if mbuf data resides in various chunks in physical memory,mtod will no more help for the sake of DMAing? Or is it that whenever the higer layers give data to be transferred , it will be guarentted that they reside contiguous?Also I read somewhere that mtod functions work only when the data is embedded into the structure and not externally in mbuf clusters? Please reply. Thanks a lot in advance, shubha To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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