Date: Fri, 18 Jan 2002 16:46:18 -0800 From: Skye Poier <skye@ffwd.cx> To: hackers@freebsd.org Subject: mbuf chains Message-ID: <20020118164617.L99893@ffwd.cx>
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What are the rules around mbuf chain construction? (I've read man mbuf, doesnt go into much detail) In particular, I'm assuming: - all mbufs must be same type - the head mbuf must have M_PKTHDR set - the head mbuf.m_pkthdr.len must be the len of the entire chain Anything to add? My confusion is around splitting/concatenating - When splitting an mbuf chain, the two resultant chains must be as above (heads have M_PKTHDR and mbuf.m_pkthdr.len set) right? When concatenating chains, what do you do with the M_PKTHDR that is now in the middle of the chain? m_cat doesn't seem very sophisticated in this regard. And of course update head mbuf.m_pkthdr.len Thanks Skye To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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