netdev - Re: [PATCH v3 bpf-next 5/5] selftest: Add tests for XDP programs in devmap entries

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Date:   Fri, 29 May 2020 18:58:46 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     David Ahern <dsahern@...il.com>, David Ahern <dsahern@...nel.org>,
        netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        brouer@...hat.com, lorenzo@...nel.org, daniel@...earbox.net,
        john.fastabend@...il.com, ast@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, andriin@...com
Subject: Re: [PATCH v3 bpf-next 5/5] selftest: Add tests for XDP programs in devmap entries

David Ahern <dsahern@...il.com> writes:

> On 5/29/20 10:45 AM, Toke Høiland-Jørgensen wrote:
>>> diff --git a/tools/testing/selftests/bpf/progs/test_xdp_devmap_helpers.c b/tools/testing/selftests/bpf/progs/test_xdp_devmap_helpers.c
>>> new file mode 100644
>>> index 000000000000..b360ba2bd441
>>> --- /dev/null
>>> +++ b/tools/testing/selftests/bpf/progs/test_xdp_devmap_helpers.c
>>> @@ -0,0 +1,22 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/* fails to load without expected_attach_type = BPF_XDP_DEVMAP
>>> + * because of access to egress_ifindex
>>> + */
>>> +#include <linux/bpf.h>
>>> +#include <bpf/bpf_helpers.h>
>>> +
>>> +SEC("xdp_dm_log")
>> Guess this should be xdp_devmap_log now?
>> 
> no. this program is for negative testing - it should load as an XDP
> program without the expected_attach_type set. See the comment at the top
> of the file.

Ah, right, sorry - missed that (obviously) :)

-Toke