offloading ip checksum calculation to the NIC

[Gleb Smirnoff]

On Thu, Feb 02, 2006 at 10:20:46PM -0800, kamal kc wrote:
k> i want to offload ip checksum calculation to the NIC.
k> I use 3Com 3c905B-TX NIC cards.
k> 
k> I found that there are variables::>>
k> 
k>         int	csum_flags;		/* flags regarding checksum */
k> 	int	csum_data;		/* data field used by csum routines */
k> 
k> in struct pkthdr in mbuf.h.
k> 
k> also i found the various flags for the hardware checksumming.
k> but i don't know the exact steps i need to do 
k> in order to offload checksumming. 
k> 
k> should i set the csum_flags to CSUM_IP and point
k> csum_data to the start of the ip header ??
k> 
k> it would be a great help if anybody
k> could tell me what do i need to do ?

afaik, the xl(4) driver already supports checksum calculation.

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE