Improved netmap version about fastclick HOT 2 CLOSED

Hi,

You can find the TDWB change here : https://github.com/tbarbette/netmap, that is the part where instead of poking the device registers for the current tail pointer of the ring, we use the TD writeback feature, where the tail is written in any memory location you choose. The specific patch is this one : tbarbette/netmap@c14ff0f

However after some rebase I lost the second part (I mostly moved to DPDK for my tests now) , but it is not complex, the fastclick code hasn't changed though, we can see here :
https://github.com/tbarbette/fastclick/blob/master/elements/userlevel/tonetmapdevice.cc#L160
that I pass 1 instead of 0. I modified Netmap to only call the "reclaim" part if an interrupt has happened.

The two most important things in that Netmap version are the TDWB and the support for dynamic buffer allocation (IOCTLs NIOCALLOCBUFF and NIOCFREEBUF) which allows to dynamically release and allocate buffers.

I can try to dig into backups for the reclaim part, but it is not a big deal anymore as the TDWB make it much lighter anyway.

Note that those changes are IXGBE-specific, so it concerns all 82599-based nics. i40e use TDWB by default, including in the Netmap drivers. I guess that's why Luigi never merged the patch probably just moved on... He showed interest at that time though... Probably have too much to do.

from fastclick.

Can I close this?

from fastclick.