linux-kernel - RE: [PATCH] net: mana: Add get_link and get_link

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Message-ID:
 <PH7PR21MB32606C49F796ED9E7AD0E5ABCA612@PH7PR21MB3260.namprd21.prod.outlook.com>
Date: Tue, 17 Sep 2024 20:34:40 +0000
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>, KY Srinivasan
	<kys@...rosoft.com>, "wei.liu@...nel.org" <wei.liu@...nel.org>, Dexuan Cui
	<decui@...rosoft.com>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "pabeni@...hat.com"
	<pabeni@...hat.com>, "shradhagupta@...ux.microsoft.com"
	<shradhagupta@...ux.microsoft.com>, "ahmed.zaki@...el.com"
	<ahmed.zaki@...el.com>, "colin.i.king@...il.com" <colin.i.king@...il.com>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] net: mana: Add get_link and get_link_ksettings in ethtool



> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Tuesday, September 17, 2024 11:04 AM
> To: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>; KY Srinivasan
> <kys@...rosoft.com>; wei.liu@...nel.org; Dexuan Cui
> <decui@...rosoft.com>; davem@...emloft.net; edumazet@...gle.com;
> pabeni@...hat.com; shradhagupta@...ux.microsoft.com;
> ahmed.zaki@...el.com; colin.i.king@...il.com; linux-
> hyperv@...r.kernel.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH] net: mana: Add get_link and get_link_ksettings in
> ethtool
> 
> On Tue, 17 Sep 2024 14:35:21 +0000 Haiyang Zhang wrote:
> > > Any reason why? Sometimes people add this callback for virtual
> > > devices to expose some approximate speed, but you're not reporting
> > > speed, so I'm curious.
> > Speed info isn't available from the HW yet. But we are requesting
> > that from HW team. For now, we just add some minimal info, like
> > duplex, etc.
> 
> Unless I'm misreading I don't see the answer to the "why?" in your
> reply.
> 
> What benefit does reporting duplex on a virtual device bring?
> What kind of SW need this current patch?
> etc.

I'm not aware of any SW has such requirement either.
We just want the "ethtool <nic>" cmd can output something we already know.
Is this acceptable?

Thanks,
- Haiyang