netdev - Re: [PATCH net-next] cxgb4: append firmware dump to vmcore in kernel panic

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Message-ID: <20180220164304.2a38c962@cakuba.netronome.com>
Date:   Tue, 20 Feb 2018 16:43:04 -0800
From:   Jakub Kicinski <kubakici@...pl>
To:     Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Cc:     David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ganesh GR <ganeshgr@...lsio.com>,
        Nirranjan Kirubaharan <nirranjan@...lsio.com>,
        Indranil Choudhury <indranil@...lsio.com>
Subject: Re: [PATCH net-next] cxgb4: append firmware dump to vmcore in
 kernel panic

On Mon, 19 Feb 2018 18:04:17 +0530, Rahul Lakkireddy wrote:
> Our requirement is to analyze the state of firmware/hardware at the
> time of kernel panic. 

I was wondering about this since you posted the patch and I can't come
up with any specific scenario where kernel crash would correlate
clearly with device state in non-trivial way.

Perhaps there is something about cxgb4 HW/FW that makes this useful.
Could you explain?  Could you give a real life example of a bug?  
Is it related to the TOE-looking TLS offload Atul is posting?

Is the panic you're targeting here real or manually triggered from user
space to get a full dump of kernel and FW?

That's me trying to guess what you're doing.. :)