netdev - Re: [RFC bpf-next 4/7] bpf: implement devtx timestamp kfunc

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Date: Tue, 13 Jun 2023 17:14:30 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Stanislav Fomichev <sdf@...gle.com>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
	andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
	yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
	haoluo@...gle.com, jolsa@...nel.org, netdev@...r.kernel.org
Subject: Re: [RFC bpf-next 4/7] bpf: implement devtx timestamp kfunc

On Mon, Jun 12, 2023 at 10:23:04AM -0700, Stanislav Fomichev wrote:

...

> +/**
> + * bpf_devtx_cp_timestamp - Read TX timestamp of the packet. Callable
> + * only from the devtx-complete hook.
> + * @ctx: devtx context pointer.

Hi Stan,

one minor nit: documentation of the timestamp parameter should go here.

> + *
> + * Returns 0 on success or ``-errno`` on error.
> + */
> +__bpf_kfunc int bpf_devtx_cp_timestamp(const struct devtx_frame *ctx, __u64 *timestamp)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
>  __diag_pop();

...