Björn Töpel <bjorn.topel@xxxxxxxxx> writes: > From: Björn Töpel <bjorn.topel@xxxxxxxxx> > > If an XDP program, where all the bpf_redirect_map() calls are tail > calls (as defined by the previous commit), the driver does not need to > explicitly call xdp_do_redirect(). > > The driver checks the active XDP program, and notifies the BPF helper > indirectly via xdp_set_redirect_tailcall(). > > This is just a naive, as-simple-as-possible implementation, calling > xdp_set_redirect_tailcall() for each packet. Do you really need the driver changes? The initial setup could be moved to bpf_prog_run_xdp(), and xdp_do_redirect() could be changed to an inline wrapper that just checks a flag and immediately returns 0 if the redirect action was already performed. Or am I missing some reason why this wouldn't work? -Toke
