On 1/20/20 10:21 AM, Björn Töpel wrote:
From: Björn Töpel <bjorn.topel@xxxxxxxxx>
Currently, the AF_XDP rings uses fences for the kernel-side
produce/consume functions. By updating rings for
load-acquire/store-release semantics, the full barrier (smp_mb()) on
the consumer side can be replaced.
Signed-off-by: Björn Töpel <bjorn.topel@xxxxxxxxx>
If I'm not missing something from the ring update scheme, don't you also need
to adapt to STORE.rel ->producer with matching barrier in tools/lib/bpf/xsk.h ?
Btw, alternative model could also be 09d62154f613 ("tools, perf: add and use
optimized ring_buffer_{read_head, write_tail} helpers") for the kernel side
in order to get rid of the smp_mb() on x86.
Thanks,
Daniel
