Merge branch 'bpf-fix-cpu-and-devmap-teardown'
Jesper Dangaard Brouer says: ==================== Removing entries from cpumap and devmap, goes through a number of syncronization steps to make sure no new xdp_frames can be enqueued. But there is a small chance, that xdp_frames remains which have not been flushed/processed yet. Flushing these during teardown, happens from RCU context and not as usual under RX NAPI context. The optimization introduced in commt 389ab7f0 ("xdp: introduce xdp_return_frame_rx_napi"), missed that the flush operation can also be called from RCU context. Thus, we cannot always use the xdp_return_frame_rx_napi call, which take advantage of the protection provided by XDP RX running under NAPI protection. The samples/bpf xdp_redirect_cpu have a --stress-mode, that is adjusted to easier reproduce (verified by Red Hat QA). ==================== Signed-off-by:Daniel Borkmann <daniel@iogearbox.net>
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