netdev - Re: [PATCH bpf-next 2/4] selftests: xsk: introduce XDP prog load based on existing AF

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Date:   Thu, 30 Jun 2022 11:57:22 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>
Subject: Re: [PATCH bpf-next 2/4] selftests: xsk: introduce XDP prog load
 based on existing AF_XDP socket

On Wed, Jun 29, 2022 at 4:38 PM Maciej Fijalkowski
<maciej.fijalkowski@...el.com> wrote:
>
> Currently, xsk_setup_xdp_prog() uses anonymous xsk_socket struct which
> means that during xsk_create_bpf_link() call, xsk->config.xdp_flags is
> always 0. This in turn means that from xdpxceiver it is impossible to
> use xdpgeneric attachment, so since commit 3b22523bca02 ("selftests,
> xsk: Fix bpf_res cleanup test") we were not testing SKB mode at all.
>
> To fix this, introduce a function, called xsk_setup_xdp_prog_xsk(), that
> will load XDP prog based on the existing xsk_socket, so that xsk
> context's refcount is correctly bumped and flags from application side
> are respected. Use this from xdpxceiver side so we get coverage of
> generic and native XDP program attach points.

Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>

> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> ---
>  tools/testing/selftests/bpf/xdpxceiver.c | 2 +-
>  tools/testing/selftests/bpf/xsk.c        | 5 +++++
>  tools/testing/selftests/bpf/xsk.h        | 1 +
>  3 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
> index 019c567b6b4e..c024aa91ea02 100644
> --- a/tools/testing/selftests/bpf/xdpxceiver.c
> +++ b/tools/testing/selftests/bpf/xdpxceiver.c
> @@ -1130,7 +1130,7 @@ static void thread_common_ops(struct test_spec *test, struct ifobject *ifobject)
>         if (!ifindex)
>                 exit_with_error(errno);
>
> -       ret = xsk_setup_xdp_prog(ifindex, &ifobject->xsk_map_fd);
> +       ret = xsk_setup_xdp_prog_xsk(ifobject->xsk->xsk, &ifobject->xsk_map_fd);
>         if (ret)
>                 exit_with_error(-ret);
>
> diff --git a/tools/testing/selftests/bpf/xsk.c b/tools/testing/selftests/bpf/xsk.c
> index fa13d2c44517..db911127720e 100644
> --- a/tools/testing/selftests/bpf/xsk.c
> +++ b/tools/testing/selftests/bpf/xsk.c
> @@ -880,6 +880,11 @@ static int __xsk_setup_xdp_prog(struct xsk_socket *_xdp, int *xsks_map_fd)
>         return err;
>  }
>
> +int xsk_setup_xdp_prog_xsk(struct xsk_socket *xsk, int *xsks_map_fd)
> +{
> +       return __xsk_setup_xdp_prog(xsk, xsks_map_fd);
> +}
> +
>  static struct xsk_ctx *xsk_get_ctx(struct xsk_umem *umem, int ifindex,
>                                    __u32 queue_id)
>  {
> diff --git a/tools/testing/selftests/bpf/xsk.h b/tools/testing/selftests/bpf/xsk.h
> index 915e7135337c..997723b0bfb2 100644
> --- a/tools/testing/selftests/bpf/xsk.h
> +++ b/tools/testing/selftests/bpf/xsk.h
> @@ -269,6 +269,7 @@ struct xsk_umem_config {
>         __u32 flags;
>  };
>
> +int xsk_setup_xdp_prog_xsk(struct xsk_socket *xsk, int *xsks_map_fd);
>  int xsk_setup_xdp_prog(int ifindex, int *xsks_map_fd);
>  int xsk_socket__update_xskmap(struct xsk_socket *xsk, int xsks_map_fd);
>
> --
> 2.27.0
>