On Thu, 22 Aug 2019 14:34:57 +0800 Ruifeng Wang <ruifeng.w...@arm.com> wrote:
> Currently, the tbl8 group is freed even though the readers might be > using the tbl8 group entries. The freed tbl8 group can be reallocated > quickly. This results in incorrect lookup results. > > RCU QSBR process is integrated for safe tbl8 group reclaim. > Refer to RCU documentation to understand various aspects of > integrating RCU library into other libraries. > > Signed-off-by: Ruifeng Wang <ruifeng.w...@arm.com> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com> > Reviewed-by: Gavin Hu <gavin...@arm.com> Having RCU in LPM is a good idea but difficult to find out how to do it in DPDK. Not everyone wants to use RCU, so making a required part of how LPM is used will impact users. Also, it looks like DPDK RCU lacks a good generic way to handle deferred free. Having to introduce a ring to handle is adding more complexity when a generic solution would be better (see userspace RCU library for example). Other parts of DPDK would benefit if deferred free was done better.
