netdev - Re: [PATCH bpf-next v4 04/17] libbpf: Support getsockopt XDP

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Date:   Thu, 13 Jun 2019 14:51:32 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Maxim Mikityanskiy <maximmi@...lanox.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jonathan Lemon <bsd@...com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Maciej Fijalkowski <maciejromanfijalkowski@...il.com>
Subject: Re: [PATCH bpf-next v4 04/17] libbpf: Support getsockopt XDP_OPTIONS

On Wed, 12 Jun 2019 at 20:05, Maxim Mikityanskiy <maximmi@...lanox.com> wrote:
>
> Query XDP_OPTIONS in libbpf to determine if the zero-copy mode is active
> or not.
>

Acked-by: Björn Töpel <bjorn.topel@...el.com>

> Signed-off-by: Maxim Mikityanskiy <maximmi@...lanox.com>
> Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
> Acked-by: Saeed Mahameed <saeedm@...lanox.com>
> ---
>  tools/lib/bpf/xsk.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
> index 7ef6293b4fd7..bf15a80a37c2 100644
> --- a/tools/lib/bpf/xsk.c
> +++ b/tools/lib/bpf/xsk.c
> @@ -65,6 +65,7 @@ struct xsk_socket {
>         int xsks_map_fd;
>         __u32 queue_id;
>         char ifname[IFNAMSIZ];
> +       bool zc;
>  };
>
>  struct xsk_nl_info {
> @@ -480,6 +481,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
>         void *rx_map = NULL, *tx_map = NULL;
>         struct sockaddr_xdp sxdp = {};
>         struct xdp_mmap_offsets off;
> +       struct xdp_options opts;
>         struct xsk_socket *xsk;
>         socklen_t optlen;
>         int err;
> @@ -597,6 +599,16 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
>         }
>
>         xsk->prog_fd = -1;
> +
> +       optlen = sizeof(opts);
> +       err = getsockopt(xsk->fd, SOL_XDP, XDP_OPTIONS, &opts, &optlen);
> +       if (err) {
> +               err = -errno;
> +               goto out_mmap_tx;
> +       }
> +
> +       xsk->zc = opts.flags & XDP_OPTIONS_ZEROCOPY;
> +
>         if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
>                 err = xsk_setup_xdp_prog(xsk);
>                 if (err)
> --
> 2.19.1
>