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 _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
