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Date: Fri, 26 Nov 2021 22:45:51 -0800
From: Song Liu <song@...nel.org>
To: Ong Boon Leong <boon.leong.ong@...el.com>
Cc: bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
bjorn@...nel.org, Magnus Karlsson <magnus.karlsson@...el.com>,
Jonathan Lemon <jonathan.lemon@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
KP Singh <kpsingh@...nel.org>
Subject: Re: [PATCH bpf-next 4/4] samples/bpf: xdpsock: add time-out for
cleaning Tx
On Wed, Nov 24, 2021 at 1:22 AM Ong Boon Leong <boon.leong.ong@...el.com> wrote:
>
> When user sets tx-pkt-count and in case where there are invalid Tx frame,
> the complete_tx_only_all() process polls indefinitely. So, this patch
> adds a time-out mechanism into the process so that the application
> can terminate automatically after it retries 3*polling interval duration.
>
> sock0@...0s29f1:2 txonly xdp-drv
> pps pkts 1.00
> rx 0 0
> tx 136383 1000000
> rx dropped 0 0
> rx invalid 0 0
> tx invalid 35 245
> rx queue full 0 0
> fill ring empty 0 1
> tx ring empty 957 7011
>
> sock0@...0s29f1:2 txonly xdp-drv
> pps pkts 1.00
> rx 0 0
> tx 0 1000000
> rx dropped 0 0
> rx invalid 0 0
> tx invalid 0 245
> rx queue full 0 0
> fill ring empty 0 1
> tx ring empty 1 7012
>
> sock0@...0s29f1:2 txonly xdp-drv
> pps pkts 1.00
> rx 0 0
> tx 0 1000000
> rx dropped 0 0
> rx invalid 0 0
> tx invalid 0 245
> rx queue full 0 0
> fill ring empty 0 1
> tx ring empty 1 7013
>
> sock0@...0s29f1:2 txonly xdp-drv
> pps pkts 1.00
> rx 0 0
> tx 0 1000000
> rx dropped 0 0
> rx invalid 0 0
> tx invalid 0 245
> rx queue full 0 0
> fill ring empty 0 1
> tx ring empty 1 7014
>
> sock0@...0s29f1:2 txonly xdp-drv
> pps pkts 1.00
> rx 0 0
> tx 0 1000000
> rx dropped 0 0
> rx invalid 0 0
> tx invalid 0 245
> rx queue full 0 0
> fill ring empty 0 1
> tx ring empty 0 7014
>
> sock0@...0s29f1:2 txonly xdp-drv
> pps pkts 0.00
> rx 0 0
> tx 0 1000000
> rx dropped 0 0
> rx invalid 0 0
> tx invalid 0 245
> rx queue full 0 0
> fill ring empty 0 1
> tx ring empty 0 7014
I am not following why we need examples above in the commit log.
>
> Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
> ---
> samples/bpf/xdpsock_user.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
> index 61d4063f11a..9c3311329ec 100644
> --- a/samples/bpf/xdpsock_user.c
> +++ b/samples/bpf/xdpsock_user.c
> @@ -1410,6 +1410,7 @@ static inline int get_batch_size(int pkt_cnt)
>
> static void complete_tx_only_all(void)
> {
> + u32 retries = 3;
Shall we make the retry value configurable? And maybe make it a timeout
value in seconds?
> bool pending;
> int i;
>
> @@ -1421,7 +1422,8 @@ static void complete_tx_only_all(void)
> pending = !!xsks[i]->outstanding_tx;
> }
> }
> - } while (pending);
> + sleep(opt_interval);
> + } while (pending && retries-- > 0);
> }
>
> static void tx_only_all(void)
> --
> 2.25.1
>
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