Hi All:
I want to build TOE(tcp checksum offload engine) in our hardware to improve the overall performance of NIC, however, i met a problem as follow:
AS you know, the TCP checksum protect the TCP pseudo header+TCP header+Data,
if TCP packet is fragmented into many fragments, the hardware will have not enough information to generate tcp checksum
for the whole TCP PDU, how to overcome this problem?
I searched in NIC driver source code of different vendor, found that TOE is generally used, I wonder whether the kernel will calculate the TCP checksum even we set features of this device as NETIF_F_IP_CSUM when
fragmentation happens.
Can anyone throw some lights on this problem?
Thanks a lot.
Rick.
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