netdev - Re: [PATCH bpf-next v3 07/10] samples/bpf: use recvfrom() in xdpsock/rxdrop

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Date:   Wed, 25 Nov 2020 08:59:36 +0100
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Zhang, Qi Z" <qi.z.zhang@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>
Subject: Re: [PATCH bpf-next v3 07/10] samples/bpf: use recvfrom() in xdpsock/rxdrop

On Thu, Nov 19, 2020 at 9:34 AM Björn Töpel <bjorn.topel@...il.com> wrote:
>
> From: Björn Töpel <bjorn.topel@...el.com>
>
> Start using recvfrom() the rxdrop scenario.
>
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
> ---
>  samples/bpf/xdpsock_user.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

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

> diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
> index 2567f0db5aca..f90111b95b2e 100644
> --- a/samples/bpf/xdpsock_user.c
> +++ b/samples/bpf/xdpsock_user.c
> @@ -1170,7 +1170,7 @@ static inline void complete_tx_only(struct xsk_socket_info *xsk,
>         }
>  }
>
> -static void rx_drop(struct xsk_socket_info *xsk, struct pollfd *fds)
> +static void rx_drop(struct xsk_socket_info *xsk)
>  {
>         unsigned int rcvd, i;
>         u32 idx_rx = 0, idx_fq = 0;
> @@ -1180,7 +1180,7 @@ static void rx_drop(struct xsk_socket_info *xsk, struct pollfd *fds)
>         if (!rcvd) {
>                 if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
>                         xsk->app_stats.rx_empty_polls++;
> -                       ret = poll(fds, num_socks, opt_timeout);
> +                       recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL);
>                 }
>                 return;
>         }
> @@ -1191,7 +1191,7 @@ static void rx_drop(struct xsk_socket_info *xsk, struct pollfd *fds)
>                         exit_with_error(-ret);
>                 if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
>                         xsk->app_stats.fill_fail_polls++;
> -                       ret = poll(fds, num_socks, opt_timeout);
> +                       recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL);
>                 }
>                 ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
>         }
> @@ -1233,7 +1233,7 @@ static void rx_drop_all(void)
>                 }
>
>                 for (i = 0; i < num_socks; i++)
> -                       rx_drop(xsks[i], fds);
> +                       rx_drop(xsks[i]);
>
>                 if (benchmark_done)
>                         break;
> --
> 2.27.0
>