HI All:
As the title. I saw someone mentioned that NIC should support S/G DMA, TCP
checksum offload and auto insert IP header,TCP header.
The S/G DMA is easy to understand since large mount of data can’t be allocated
into one single page, but why it need hardware to auto insert TCP header?
As I know, the TCP header should only exist in the first fragments, and it ‘s
already in skb->data, for other fragments, it’s in skb->frags, hardware only
need to insert IP header for them, so I don’t see such need to auto insert TCP
header by
Hardware.
And another question about checksum offload is that, how can hardware support
rx checksum verification if received packets are fragmented?
Thanks for your answer in advance.
Rick
_______________________________________________
Kernelnewbies mailing list
[email protected]
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
