linux-kernel - Re: [PATCH] net: bpf: add bpf_ktime_get_boot

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Message-ID: <20200426163125.rnxwntthcrx5qejf@ast-mbp>
Date:   Sun, 26 Apr 2020 09:31:25 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Maciej Żenczykowski <zenczykowski@...il.com>
Cc:     Maciej Żenczykowski <maze@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>, bpf@...r.kernel.org
Subject: Re: [PATCH] net: bpf: add bpf_ktime_get_boot_ns()

On Mon, Apr 20, 2020 at 01:26:43PM -0700, Maciej Żenczykowski wrote:
> From: Maciej Żenczykowski <maze@...gle.com>
> 
> On a device like a cellphone which is constantly suspending
> and resuming CLOCK_MONOTONIC is not particularly useful for
> keeping track of or reacting to external network events.
> Instead you want to use CLOCK_BOOTTIME.
> 
> Hence add bpf_ktime_get_boot_ns() as a mirror of bpf_ktime_get_ns()
> based around CLOCK_BOOTTIME instead of CLOCK_MONOTONIC.
> 
> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
...
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 755867867e57..ec567d1e6fb9 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -6009,6 +6009,8 @@ bpf_base_func_proto(enum bpf_func_id func_id)
>  		return &bpf_tail_call_proto;
>  	case BPF_FUNC_ktime_get_ns:
>  		return &bpf_ktime_get_ns_proto;
> +	case BPF_FUNC_ktime_get_boot_ns:
> +		return &bpf_ktime_get_boot_ns_proto;
>  	default:
>  		break;
>  	}

That part got moved into kernel/bpf/helpers.c in the mean time.
I fixed it up and applied. Thanks

In the future please cc bpf@...r for all bpf related patches.