Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Sun, 26 Apr 2020 09:31:25 -0700
From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
To:     Maciej =?utf-8?Q?=C5=BBenczykowski?= <zenczykowski@gmail.com>
Cc:     Maciej =?utf-8?Q?=C5=BBenczykowski?= <maze@google.com>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Linux Network Development Mailing List 
        <netdev@vger.kernel.org>, linux-kernel@vger.kernel.org,
        "David S . Miller" <davem@davemloft.net>, bpf@vger.kernel.org
Subject: Re: [PATCH] net: bpf: add bpf_ktime_get_boot_ns()
Message-ID: <20200426163125.rnxwntthcrx5qejf@ast-mbp>
References: <20200420202643.87198-1-zenczykowski@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20200420202643.87198-1-zenczykowski@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Apr 20, 2020 at 01:26:43PM -0700, Maciej Żenczykowski wrote:
> From: Maciej Żenczykowski <maze@google.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@google.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@vger for all bpf related patches.