Date: Mon, 22 Dec 2008 10:19:29 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: Michael T?xen <Michael.Tuexen@lurchi.franken.de> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: Checksum offloading Message-ID: <20081222011929.GB86809@cdnetworks.co.kr> In-Reply-To: <FE14F235-917E-4B3C-A7DB-55E26E0BB9E4@lurchi.franken.de> References: <FE14F235-917E-4B3C-A7DB-55E26E0BB9E4@lurchi.franken.de>
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On Sat, Dec 20, 2008 at 10:31:39PM +0100, Michael T?xen wrote: > Dear all, > > I'm currently analyzing how TCP/UDP checksum offloading works > to find the best way to add SCTP checksum offloading. > > sys/mbuf.h has constants: > #define CSUM_IP 0x0001 /* will csum IP */ > #define CSUM_TCP 0x0002 /* will csum TCP */ > #define CSUM_UDP 0x0004 /* will csum UDP */ > which are used to signal which offloading is supported by the drive. > But, if I understand the code correctly, this only > applies to UDP/IPv4 and TCP/IPv4. > What about IPv6? Would this require flags like CSUM_TCP6 and CSUM_UDP6 > to signal that also offloading of UDP/IPv6 and TCP/IPv6 is supported? > > I'm asking this because we want to add CRC offloading for SCTP/IPv4 > and SCTP/IPv6. We could only add one flag CSUM_SCTP and use it > for IPv4 and IPv6 ar two flags CSUM_SCTP4 and CSUM_SCTP6... > I guess you're right. FreeBSD still lacks IPv6 checksum offloading related stuff. All recent hardwares support checksum offloading for TCP/UDP/IPv6 as well as TSO for IPv6. Don't know SCTP checksum offloading as I don't know any hardwares that can do SCTP checksum offloading. Sun Netptune might have the capability but I didn't check it though. > Best regards > Michael -- Regards, Pyun YongHyeon
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