Hi Björn,
Thanks for trying it out! I rebase to the commit you have.
The xdp_rxq_info also not showing packets, so it's not the af_xdp
specific issue.
I found that if I increase the ping rate from ping -i 1 to faster,
such as ping -i 0.2,
then both xdpsock and xdp_rxq_info work. I have no idea why, maybe both programs
collect statistic per second and counter resets.
Regards,
William
On Tue, Mar 26, 2019 at 11:00 PM Björn Töpel <bjorn.topel@xxxxxxxxx> wrote:
>
> On Tue, 26 Mar 2019 at 21:18, William Tu <u9012063@xxxxxxxxx> wrote:
> >
> > Hi,
> >
> > I'm testing xdpsock on the latest bpf-next and found that rxdrop does not work.
> >
> > To reproduce the issue:
> > -------------------------------
> > ip netns add at_ns0
> > ip link add p0 type veth peer name afxdp-p0
> > ip link set p0 netns at_ns0
> > ip link set dev afxdp-p0 up
> > ip netns exec at_ns0 sh << NS_EXEC_HEREDOC
> > ip addr add "10.1.1.1/24" dev p0
> > ip link set dev p0 up
> > NS_EXEC_HEREDOC
> >
> > ip addr add "10.1.1.2/24" dev afxdp-p0
> > ip netns exec at_ns0 ping 10.1.1.2
> > # the afxdp-p0 will receive ping packets
> >
> > At another console, run SKB mode rxdrop
> > ------------------------------------------------------
> > root@osboxes:~/bpf-next/samples/bpf# ./xdpsock -r -S -p -i afxdp-p0
> > sock0@afxdp-p0:0 rxdrop xdp-skb poll()
> > pps pkts 1.00
> > rx 0 0
> > tx 0 0
> >
> > Where I think xdpsock should receive packet here, but it's not.
> > it turns out at rx_drop(),
> > 514 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> > 515 while (ret != rcvd) {
> > 518 if (ret < 0)
> > 519 exit_with_error(-ret);
> > 520 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> > 521 }
> >
> > It keeps retrying to reserve blocks in FQ but fails. I'm debugging
> > this but any suggestions
> > are welcome.
> >
>
> I tried your setup on bpf-next b4b6aa83433e ("selftests: bpf: don't
> depend on hardcoded perf sample_freq"), and it works for me (both with
> and w/o poll).
>
> What do you get if you run the xdp_rxq_info?
> # xdp_rxq_info --dev afxdp-p0 --action XDP_DROP
> # xdp_rxq_info --dev afxdp-p0 -S --action XDP_DROP
>
> I run "ping -fb 10.1.1.255" on the veth pair's other end.
>
>
> Björn
>
> > Regards,
> > William
|