Date: Mon, 20 Nov 2023 01:49:33 +0800 From: Zhenlei Huang <zlei@FreeBSD.org> To: =?utf-8?Q?Mina_Gali=C4=87?= <freebsd@igalic.co> Cc: Kyle Evans <kevans@FreeBSD.org>, freebsd-net@freebsd.org Subject: Re: How to tell if a network interface was renamed (and from what) Message-ID: <032BADD4-0A49-42E2-BAAB-40D2F76C64B9@FreeBSD.org> In-Reply-To: <ptnVEMJ_x48tdYePN4iYRiEW2vWqwulbEOUJ4dQ1cKGkxNXZPPfdEVHdJKNHFfs2onxNipVZKPwDZZKlDv1peS1Xttim1VitMFsdUiTkAKE=@igalic.co> References: <pdHC0ObBkAbx2HfFIhWYaB5-dmQDEUzNTWvVVJAuJV7FWdWWeSwybVFD-uyBUxPlqDRpAW7D1aAZsbrTxEj9kqsq7ESgO41srPmS-PcXGqw=@igalic.co> <E5F5F61E-3827-404A-A46F-BBCF45A29A82@FreeBSD.org> <9eef5488-e8da-4edd-bc00-baeb5aaf4a23@FreeBSD.org> <ptnVEMJ_x48tdYePN4iYRiEW2vWqwulbEOUJ4dQ1cKGkxNXZPPfdEVHdJKNHFfs2onxNipVZKPwDZZKlDv1peS1Xttim1VitMFsdUiTkAKE=@igalic.co>
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> On Nov 19, 2023, at 10:34 PM, Mina Gali=C4=87 <freebsd@igalic.co> = wrote: >=20 >=20 >=20 >>> FreeBSD currently does not preserve the old ( original ) name of >>> interfaces if it is renamed ( either physical or cloned ones ). >>> While there's an attempt https://reviews.freebsd.org/D28247 >>> to get the device name (physical >>> ones) but it is not perfect and not completed. >>>=20 >>> So may I ask why you need to know if a network interface was renamed = ? >>=20 >>=20 >> Just last week I found this quite a pain as well; once an interface = has >> been renamed, if it's not a pseudo-interface with an obvious group >> there's no clear way, AFAICT, to determine which driver created it >=20 > I think the main reason that we need to know if and from what an = interface has been renamed is if we need to know what driver we're = working with. >=20 > But given that a rename doesn't change =E2=80=94 or even just *alias* > the sysctl dev hierarchy, where a %driver is recorded, we can't > track it back. >=20 > (but again, that's just for physical devices, then again virtual = devices record what type of device they are in their group which > is essentially the same thing) Since it is just for physical devices, may I propose to have the driver = name in their groups ? So an if_ure interface ue0 will look like: ``` ue0: flags=3D1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> = metric 0 mtu 1500 = options=3D60009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,RXCSUM_= IPV6,TXCSUM_IPV6> ether 00:e0:4c:xx:xx:xx media: Ethernet autoselect (1000baseT <full-duplex>) status: active +++ groups: ure nd6 options=3D23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL> ``` That does not include the unit number. But could be useful to quickly = get the driver name of physical devices. >=20 > As soon as we have more than one interface with different drivers > it's impossible to parse out what we're dealing with without > parsing rc.conf, logs, or worse things I can't think of right now. >=20 >=20 >=20 >=20 >=20
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