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Date:   Mon, 7 Dec 2020 21:55:13 +0000
From:   Weqaar Janjua <weqaar.janjua@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>, ast@...nel.org,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Weqaar Janjua <weqaar.a.janjua@...el.com>, shuah@...nel.org,
        skhan@...uxfoundation.org, linux-kselftest@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>,
        jonathan.lemon@...il.com
Subject: Re: [PATCH bpf-next v3 1/5] selftests/bpf: xsk selftests framework

On Sat, 28 Nov 2020 at 03:13, Yonghong Song <yhs@...com> wrote:
>
>
>
> On 11/27/20 9:54 AM, Weqaar Janjua wrote:
> > On Fri, 27 Nov 2020 at 04:19, Yonghong Song <yhs@...com> wrote:
> >>
> >>
> >>
> >> On 11/26/20 1:22 PM, Weqaar Janjua wrote:
> >>> On Thu, 26 Nov 2020 at 09:01, Björn Töpel <bjorn.topel@...el.com> wrote:
> >>>>
> >>>> On 2020-11-26 07:44, Yonghong Song wrote:
> >>>>>
> >>>> [...]
> >>>>>
> >>>>> What other configures I am missing?
> >>>>>
> >>>>> BTW, I cherry-picked the following pick from bpf tree in this experiment.
> >>>>>      commit e7f4a5919bf66e530e08ff352d9b78ed89574e6b (HEAD -> xsk)
> >>>>>      Author: Björn Töpel <bjorn.topel@...el.com>
> >>>>>      Date:   Mon Nov 23 18:56:00 2020 +0100
> >>>>>
> >>>>>          net, xsk: Avoid taking multiple skbuff references
> >>>>>
> >>>>
> >>>> Hmm, I'm getting an oops, unless I cherry-pick:
> >>>>
> >>>> 36ccdf85829a ("net, xsk: Avoid taking multiple skbuff references")
> >>>>
> >>>> *AND*
> >>>>
> >>>> 537cf4e3cc2f ("xsk: Fix umem cleanup bug at socket destruct")
> >>>>
> >>>> from bpf/master.
> >>>>
> >>>
> >>> Same as Bjorn's findings ^^^, additionally applying the second patch
> >>> 537cf4e3cc2f [PASS] all tests for me
> >>>
> >>> PREREQUISITES: [ PASS ]
> >>> SKB NOPOLL: [ PASS ]
> >>> SKB POLL: [ PASS ]
> >>> DRV NOPOLL: [ PASS ]
> >>> DRV POLL: [ PASS ]
> >>> SKB SOCKET TEARDOWN: [ PASS ]
> >>> DRV SOCKET TEARDOWN: [ PASS ]
> >>> SKB BIDIRECTIONAL SOCKETS: [ PASS ]
> >>> DRV BIDIRECTIONAL SOCKETS: [ PASS ]
> >>>
> >>> With the first patch alone, as soon as we enter DRV/Native NOPOLL mode
> >>> kernel panics, whereas in your case NOPOLL tests were falling with
> >>> packets being *lost* as per seqnum mismatch.
> >>>
> >>> Can you please test this out with both patches and let us know?
> >>
> >> I applied both the above patches in bpf-next as well as this patch set,
> >> I still see failures. I am attaching my config file. Maybe you can take
> >> a look at what is the issue.
> >>
> > Thanks for the config, can you please confirm the compiler version,
> > and resource limits i.e. stack size, memory, etc.?
>
> root@...h-fb-vm1:~/net-next/net-next/tools/testing/selftests/bpf ulimit -a
> core file size          (blocks, -c) unlimited
> data seg size           (kbytes, -d) unlimited
> scheduling priority             (-e) 0
> file size               (blocks, -f) unlimited
> pending signals                 (-i) 15587
> max locked memory       (kbytes, -l) unlimited
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 1024
> pipe size            (512 bytes, -p) 8
> POSIX message queues     (bytes, -q) 819200
> real-time priority              (-r) 0
> stack size              (kbytes, -s) 8192
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 15587
> virtual memory          (kbytes, -v) unlimited
> file locks                      (-x) unlimited
>
> compiler: gcc 8.2
>
> >
> > Only NOPOLL tests are failing for you as I see it, do the same tests
> > fail every time?
>
> In my case, with above two bpf patches applied as well, I got:
> $ ./test_xsk.sh
> setting up ve9127: root: 192.168.222.1/30
>
> setting up ve4520: af_xdp4520: 192.168.222.2/30
>
> Spec file created: veth.spec
>
> PREREQUISITES: [ PASS ]
>
> # Interface found: ve9127
>
> # Interface found: ve4520
>
> # NS switched: af_xdp4520
>
> 1..1
>
> # Interface [ve4520] vector [Rx]
>
> # Interface [ve9127] vector [Tx]
>
> # Sending 10000 packets on interface ve9127
>
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [59], payloadseqnum [0]
>
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
>
> SKB NOPOLL: [ FAIL ]
>
> # Interface found: ve9127
>
> # Interface found: ve4520
>
> # NS switched: af_xdp4520
> # NS switched: af_xdp4520
>
> 1..1
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> # End-of-tranmission frame received: PASS
> # Received 10000 packets on interface ve4520
> ok 1 PASS: SKB POLL
> # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
> SKB POLL: [ PASS ]
> # Interface found: ve9127
> # Interface found: ve4520
> # NS switched: af_xdp4520
> 1..1
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [153], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV NOPOLL: [ FAIL ]
> # Interface found: ve9127
> # Interface found: ve4520
> # NS switched: af_xdp4520
> 1..1
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> # End-of-tranmission frame received: PASS
> # Received 10000 packets on interface ve4520
> ok 1 PASS: DRV POLL
> # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
> DRV POLL: [ PASS ]
> # Interface found: ve9127
> # Interface found: ve4520
> # NS switched: af_xdp4520
> 1..1
> # Creating socket
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [54], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> SKB SOCKET TEARDOWN: [ FAIL ]
> # Interface found: ve9127
> # Interface found: ve4520
> # NS switched: af_xdp4520
> 1..1
> # Creating socket
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [0], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV SOCKET TEARDOWN: [ FAIL ]
> # Interface found: ve9127
> # Interface found: ve4520
> # NS switched: af_xdp4520
> 1..1
> # Creating socket
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [64], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> SKB BIDIRECTIONAL SOCKETS: [ FAIL ]
> # Interface found: ve9127
> # Interface found: ve4520
> # NS switched: af_xdp4520
> 1..1
> # Creating socket
> # Interface [ve4520] vector [Rx]
> # Interface [ve9127] vector [Tx]
> # Sending 10000 packets on interface ve9127
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [83], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV BIDIRECTIONAL SOCKETS: [ FAIL ]
> cleaning up...
> removing link ve4520
> removing ns af_xdp4520
> removing spec file: veth.spec
>
> Second runs have one previous success becoming failure.
>
> ./test_xsk.sh
> setting up ve2458: root: 192.168.222.1/30
>
> setting up ve4468: af_xdp4468: 192.168.222.2/30
>
> [  286.597111] IPv6: ADDRCONF(NETDEV_CHANGE): ve4468: link becomes ready
>
> Spec file created: veth.spec
>
> PREREQUISITES: [ PASS ]
>
> # Interface found: ve2458
>
> # Interface found: ve4468
>
> # NS switched: af_xdp4468
>
> 1..1
>
> # Interface [ve4468] vector [Rx]
>
> # Interface [ve2458] vector [Tx]
>
> # Sending 10000 packets on interface ve2458
>
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [67], payloadseqnum [0]
>
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
>
> SKB NOPOLL: [ FAIL ]
>
> # Interface found: ve2458
>
> # Interface found: ve4468
>
> # NS switched: af_xdp4468
>
> 1..1
>
> # Interface [ve4468] vector [Rx]
>
> # Interface [ve2458] vector [Tx]
>
> # Sending 10000 packets on interface ve2458
>
> # End-of-tranmission frame received: PASS
> # Received 10000 packets on interface ve4468
> ok 1 PASS: SKB POLL
> # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
> SKB POLL: [ PASS ]
> # Interface found: ve2458
> # Interface found: ve4468
> # NS switched: af_xdp4468
> 1..1
> # Interface [ve4468] vector [Rx]
> # Interface [ve2458] vector [Tx]
> # Sending 10000 packets on interface ve2458
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [191], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV NOPOLL: [ FAIL ]
> # Interface found: ve2458
> # Interface found: ve4468
> # NS switched: af_xdp4468
> 1..1
> # Interface [ve4468] vector [Rx]
> # Interface [ve2458] vector [Tx]
> # Sending 10000 packets on interface ve2458
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [0], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV POLL: [ FAIL ]
> # Interface found: ve2458
> # Interface found: ve4468
> # NS switched: af_xdp4468
> 1..1
> # Creating socket
> # Interface [ve4468] vector [Rx]
> # Interface [ve2458] vector [Tx]
> # Sending 10000 packets on interface ve2458
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [0], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> SKB SOCKET TEARDOWN: [ FAIL ]
> # Interface found: ve2458
> # Interface found: ve4468
> # NS switched: af_xdp4468
> 1..1
> # Creating socket
> # Interface [ve4468] vector [Rx]
> # Interface [ve2458] vector [Tx]
> # Sending 10000 packets on interface ve2458
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [171], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV SOCKET TEARDOWN: [ FAIL ]
> # Interface found: ve2458
> # Interface found: ve4468
> # NS switched: af_xdp4468
> 1..1
> # Creating socket
> # Interface [ve4468] vector [Rx]
> # Interface [ve2458] vector [Tx]
> # Sending 10000 packets on interface ve2458
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [124], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> SKB BIDIRECTIONAL SOCKETS: [ FAIL ]
> # Interface found: ve2458
> # Interface found: ve4468
> # NS switched: af_xdp4468
> 1..1
> # Creating socket
> # Interface [ve4468] vector [Rx]
> # Interface [ve2458] vector [Tx]
> # Sending 10000 packets on interface ve2458
> not ok 1 ERROR: [worker_pkt_validate] prev_pkt [195], payloadseqnum [0]
> # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
> DRV BIDIRECTIONAL SOCKETS: [ FAIL ]
> cleaning up...
> removing link ve4468
> removing ns af_xdp4468
> removing spec file: veth.spec
>
> >
> > I will need to spend some time debugging this to have a fix.
>
> Thanks.
>
> >
> > Thanks,
> > /Weqaar
> >
> >>>
> >>>> Can I just run test_xsk.sh at tools/testing/selftests/bpf/ directory?
> >>>> This will be easier than the above for bpf developers. If it does not
> >>>> work, I would like to recommend to make it work.
> >>>>
> >>> yes test_xsk.shis self contained, will update the instructions in there with v4.
> >>
> >> That will be great. Thanks!
> >>
v4 is out on the list, incorporating most if not all your suggestions
to the best of my memory.

I was able to reproduce the issue you were seeing (from your logs) ->
veth interfaces were receiving packets from the IPv6 neighboring
system (thanks @Björn Töpel for mentioning this).

The packet validation algo in *xdpxceiver* *assumed* all packets would
be IPv4 and intended for Rx.
Rx validates packets on both ip->tos = 0x9 (id for xsk tests) and
ip->version = 0x4, ignores the rest.

Hoping the tests now work -> PASS in your environment.

Thanks,
/Weqaar

> >>>
> >>> Thanks,
> >>> /Weqaar
> >>>>
> >>>> Björn

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