Date: Sat, 20 Dec 2008 22:31:39 +0100 From: =?ISO-8859-1?Q?Michael_T=FCxen?= <Michael.Tuexen@lurchi.franken.de> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: Checksum offloading Message-ID: <FE14F235-917E-4B3C-A7DB-55E26E0BB9E4@lurchi.franken.de>
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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... Best regards Michael
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