Network buffers

Hi All,

I have a unique requirement for a ethernet device. We need to DMA
packets from the device which has a header associated along with the
ethernet frame. I need a efficient mechanism to pass this packet to the
user-space. The user-space process will process the header and provide
the ifindex of the interface.

I was thinking of a circular buffer between the kernel and user space.
But the issue is that after the user-space provides the map from the
header to the ifindex, I need that information back in the
kernel(preferably using the same buffer). I currently have the
mapping(header->ifindex) only in user space and don't want to replicate
the mapping in the kernel space.

Is there a better mechanism to solve this?

Thanks,

Shobha.

There is mechanism for filtering packets of icmp.
But you can't access kernel space. You have
to read the packets from kernel space to userspace.
If you can find mechanism like filtering of icmp then
ok otherwise stick to your approach.