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Message-ID: <61e8c5cf-247f-484e-b3cc-27ab86e372de@linux.dev>
Date: Tue, 29 Oct 2024 16:00:22 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Jason Xing <kerneljasonxing@...il.com>, willemb@...gle.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, dsahern@...nel.org, willemdebruijn.kernel@...il.com,
ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, eddyz87@...il.com,
song@...nel.org, yonghong.song@...ux.dev, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org,
shuah@...nel.org, ykolal@...com, bpf@...r.kernel.org,
netdev@...r.kernel.org, Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v3 02/14] net-timestamp: allow two features to
work parallelly
On 10/28/24 4:05 AM, Jason Xing wrote:
> From: Jason Xing <kernelxing@...cent.com>
>
> This patch has introduced a separate sk_tsflags_bpf for bpf
> extension, which helps us let two feature work nearly at the
> same time.
>
> Each feature will finally take effect on skb_shinfo(skb)->tx_flags,
> say, tcp_tx_timestamp() for TCP or skb_setup_tx_timestamp() for
> other types, so in __skb_tstamp_tx() we are unable to know which
> feature is turned on, unless we check each feature's own socket
> flag field.
>
> Signed-off-by: Jason Xing <kernelxing@...cent.com>
> ---
> include/net/sock.h | 1 +
> net/core/skbuff.c | 39 +++++++++++++++++++++++++++++++++++++++
> 2 files changed, 40 insertions(+)
>
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 7464e9f9f47c..5384f1e49f5c 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -445,6 +445,7 @@ struct sock {
> u32 sk_reserved_mem;
> int sk_forward_alloc;
> u32 sk_tsflags;
> + u32 sk_tsflags_bpf;
> __cacheline_group_end(sock_write_rxtx);
>
> __cacheline_group_begin(sock_write_tx);
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 1cf8416f4123..39309f75e105 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -5539,6 +5539,32 @@ void skb_complete_tx_timestamp(struct sk_buff *skb,
> }
> EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
>
> +/* This function is used to test if application SO_TIMESTAMPING feature
> + * or bpf SO_TIMESTAMPING feature is loaded by checking its own socket flags.
> + */
> +static bool sk_tstamp_tx_flags(struct sock *sk, u32 tsflags, int tstype)
> +{
> + u32 testflag;
> +
> + switch (tstype) {
> + case SCM_TSTAMP_SCHED:
> + testflag = SOF_TIMESTAMPING_TX_SCHED;
> + break;
> + case SCM_TSTAMP_SND:
> + testflag = SOF_TIMESTAMPING_TX_SOFTWARE;
> + break;
> + case SCM_TSTAMP_ACK:
> + testflag = SOF_TIMESTAMPING_TX_ACK;
> + break;
> + default:
> + return false;
> + }
> + if (tsflags & testflag)
> + return true;
> +
> + return false;
> +}
> +
> static void skb_tstamp_tx_output(struct sk_buff *orig_skb,
> const struct sk_buff *ack_skb,
> struct skb_shared_hwtstamps *hwtstamps,
> @@ -5549,6 +5575,9 @@ static void skb_tstamp_tx_output(struct sk_buff *orig_skb,
> u32 tsflags;
>
> tsflags = READ_ONCE(sk->sk_tsflags);
> + if (!sk_tstamp_tx_flags(sk, tsflags, tstype))
I still don't get this part since v2. How does it work with cmsg only
SOF_TIMESTAMPING_TX_*?
I tried with "./txtimestamp -6 -c 1 -C -N -L ::1" and it does not return any tx
time stamp after this patch.
I am likely missing something
or v2 concluded that this behavior change is acceptable?
> + return;
> +
> if (!hwtstamps && !(tsflags & SOF_TIMESTAMPING_OPT_TX_SWHW) &&
> skb_shinfo(orig_skb)->tx_flags & SKBTX_IN_PROGRESS)
> return;
> @@ -5592,6 +5621,15 @@ static void skb_tstamp_tx_output(struct sk_buff *orig_skb,
> __skb_complete_tx_timestamp(skb, sk, tstype, opt_stats);
> }
>
> +static void skb_tstamp_tx_output_bpf(struct sock *sk, int tstype)
> +{
> + u32 tsflags;
> +
> + tsflags = READ_ONCE(sk->sk_tsflags_bpf);
> + if (!sk_tstamp_tx_flags(sk, tsflags, tstype))
> + return;
> +}
> +
> void __skb_tstamp_tx(struct sk_buff *orig_skb,
> const struct sk_buff *ack_skb,
> struct skb_shared_hwtstamps *hwtstamps,
> @@ -5600,6 +5638,7 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
> if (!sk)
> return;
>
> + skb_tstamp_tx_output_bpf(sk, tstype);
> skb_tstamp_tx_output(orig_skb, ack_skb, hwtstamps, sk, tstype);
> }
> EXPORT_SYMBOL_GPL(__skb_tstamp_tx);
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