linux-kernel - Re: [PATCH AUTOSEL for 4.15 058/124] ipv6: Set nexthop flags during route creation

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Message-ID: <20180403032714.GJ7561@sasha-vm>
Date:   Tue, 3 Apr 2018 03:27:16 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     Ido Schimmel <idosch@...lanox.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH AUTOSEL for 4.15 058/124] ipv6: Set nexthop flags during
 route creation

On Mon, Mar 19, 2018 at 08:04:34PM +0200, Ido Schimmel wrote:
>On Mon, Mar 19, 2018 at 03:48:00PM +0000, Sasha Levin wrote:
>> From: Ido Schimmel <idosch@...lanox.com>
>>
>> [ Upstream commit 5609b80a37f69f796548339e675256188b29c17d ]
>>
>> It is valid to install routes with a nexthop device that does not have a
>> carrier, so we need to make sure they're marked accordingly.
>>
>> As explained in the previous patch, host and anycast routes are never
>> marked with the 'linkdown' flag.
>>
>> Note that reject routes are unaffected, as these use the loopback device
>> which always has a carrier.
>>
>> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
>> Acked-by: David Ahern <dsahern@...il.com>
>> Signed-off-by: David S. Miller <davem@...emloft.net>
>> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
>
>Hi Sasha,
>
>It doesn't really make sense to take this patch to 4.15 (and 4.14 from
>your other mail). The flag is never used there.
>
>In these kernels the flag is dumped to user space based on a carrier
>check. See commit 44c9f2f206f8 ("ipv6: Check nexthop flags in route dump
>instead of carrier").
>
>Similarly, during route lookup the carrier is checked and not the flag.
>See commit 14c5206c2d02 ("ipv6: Check nexthop flags during route lookup
>instead of carrier").
>
>Thanks

Now removed, thanks!