cvs commit: src/sys/dev/msk if_msk.c

Rui Paulo rpaulo at
Wed Apr 11 11:40:29 UTC 2007

Pyun YongHyeon wrote:
> yongari     2007-04-11 00:47:29 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/dev/msk          if_msk.c 
>   Log:
>   Add work around for hardware Tx checksum offload bug in Yukon II.
>   Yukon II generated corrupted TCP checksum for short TCP packets
>   that's less than 60 bytes in size(e.g. window probe packet, pure ACK
>   packet etc). Padding the frame with zeros to make the frame minimum
>   ethernet frame size didn't work at all. Instead of dropping Tx
>   checksum offload support we calculate TCP checksum with S/W method
>   when we encounter short TCP frames.
>   Fortunately it seems that short UDP datagrams appear to be handled
>   correctly by Yukon II.
>   While I'm here simplify ethernet/VLAN header size calculation logic.

Thanks! :)

Rui Paulo | PGP: F0E4 C7C7 1653 79B7 78DC  DD73 64FA B2C6 CF45 1F84

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