Date: Thu, 2 Feb 2006 22:20:46 -0800 (PST) From: kamal kc <kamal_ckk@yahoo.com> To: freebsd <freebsd-net@freebsd.org> Subject: offloading ip checksum calculation to the NIC Message-ID: <20060203062046.86880.qmail@web30011.mail.mud.yahoo.com>
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dear all,
i want to offload ip checksum calculation to the NIC.
I use 3Com 3c905B-TX NIC cards.
I found that there are variables::>>
int csum_flags; /* flags regarding checksum */
int csum_data; /* data field used by csum routines */
in struct pkthdr in mbuf.h.
also i found the various flags for the hardware checksumming.
but i don't know the exact steps i need to do
in order to offload checksumming.
should i set the csum_flags to CSUM_IP and point
csum_data to the start of the ip header ??
it would be a great help if anybody
could tell me what do i need to do ?
thanks,
kamal
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