On Wed, 2025-08-13 at 22:09 +0200, Yureka Lilian wrote: > Previously, re-using pinned DEVMAP maps would always fail, because > get_map_info on a DEVMAP always returns flags with BPF_F_RDONLY_PROG set, > but BPF_F_RDONLY_PROG being set on a map during creation is invalid. > > Thus, ignore the BPF_F_RDONLY_PROG flag on both sides when checking for > compatibility with an existing DEVMAP. > > Ignoring it on both sides ensures that it continues to work on older > kernels which don't set BPF_F_RDONLY_PROG on get_map_info. > > The same problem is handled in a third-party ebpf library: > - https://github.com/cilium/ebpf/issues/925 > - https://github.com/cilium/ebpf/pull/930 > > Fixes: 0cdbb4b09a06 ("devmap: Allow map lookups from eBPF") > Signed-off-by: Yureka Lilian <yuka@xxxxxxxx> > --- Reviewed-by: Eduard Zingerman <eddyz87@xxxxxxxxx> [...]
