Check if we're in NAPI context when refilling rx. Normally we're almost always running in NAPI context. Dispatch to napi_alloc_frag() directly instead of relying on netdev_alloc_frag() which does the same but with the overhead of local_bh_disable/enable. Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com> [improve code format] Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>