netdev - Re: [patch net-next RFC 00/10] introduce line card support for modular switch

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Date:   Mon, 18 Jan 2021 15:57:56 -0700
From:   David Ahern <dsahern@...il.com>
To:     Edwin Peer <edwin.peer@...adcom.com>, Jiri Pirko <jiri@...nulli.us>
Cc:     netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jacob Keller <jacob.e.keller@...el.com>, roopa@...dia.com,
        mlxsw <mlxsw@...dia.com>
Subject: Re: [patch net-next RFC 00/10] introduce line card support for
 modular switch

On 1/18/21 11:01 AM, Edwin Peer wrote:
> I'm facing a similar issue with NIC firmware that isn't yet ready by
> device open time, but have been resisting the urge to lie to the stack

why not have the ndo_open return -EBUSY or -EAGAIN to tell S/W to try
again 'later'?

> about the state of the device and use link state as the next gate.
> Sure, most things will just work most of the time, but the problems
> with this approach are manifold. Firstly, at least in the NIC case,
> the user may confuse this state for some kind of cable issue and go
> looking in the wrong place for a solution. But, there are also several
> ways the initialization can fail after this point and now the device
> is administratively UP, but can never be UP, with no sanctioned way to
> communicate the failure. Aren't the issues here similar?