> I have written a driver for an Intel ixf1002 chip, which has some
> surrounding HW, and is capable of checksumming and processing
> dma in fragments. Is there any information on what changes I
> would have to make to the driver to support zerocopy/checksum ?
The driver has to set dev->features to its checksum capabilities (see skbuff.h
for more details) and implement them. It should also be able to process
skbs with multiple skb fragments in hard_start_xmit for true zero copy;
in this case set NETIF_F_SG and also NETIF_F_HIGHDMA if it supports 64bit
addresses. When NETIF_F_SG and NETIF_F_IP_CSUM or NETIFI_F_HW_CSUM are set
the stack will do zero copy IO on TX with sendfile.
-Andi
-Andi
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