From: Jakub Kicinski <jakub.kicin...@netronome.com> Date: Fri, 10 Mar 2017 10:38:26 -0800
> This series adds support for XDP adjust head. Bulk of the code > is actually just paying technical debt. On reconfiguration request > nfp was allocating new resources separately leaving device running > with the existing set of rings. We used to manage the new resources > in special ring set structures. This set is simply separating the > datapath part of the device structure from the control information > allowing the new datapath structure to be allocated with all new > memory and rings. The swap operation is now greatly simplified. > We also save a lot of parameter passing this way. Hopefully the churn > is worth the negative diffstat. > > Support for XDP adjust head is done in a pretty standard way. NFP > is a bit special because it prepends metadata before packet data > so we have to do a bit of memcpying in case XDP will run. We also > luck out a little bit because the fact that we already have prepend > space allocated means that one byte is enough to store the extra XDP > space (256 of standard prepend space is a bit inconvenient since > it would normally require 16bits or boolean with additional shifts). Series applied, thanks.
