linux-kernel - Re: [PATCH v4 1/1] nvme: handle persistent internal error AER from NVMe controller

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Date:   Thu, 9 Jun 2022 00:28:10 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     Michael Kelley <mikelley@...rosoft.com>
CC:     "caroline.subramoney@...rosoft.com" 
        <caroline.subramoney@...rosoft.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "axboe@...com" <axboe@...com>,
        "riwurd@...rosoft.com" <riwurd@...rosoft.com>,
        "nathan.obr@...rosoft.com" <nathan.obr@...rosoft.com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "kbusch@...nel.org" <kbusch@...nel.org>, "hch@....de" <hch@....de>
Subject: Re: [PATCH v4 1/1] nvme: handle persistent internal error AER from
 NVMe controller

On 6/8/22 17:22, Chaitanya Kulkarni wrote:
> On 6/8/22 11:52, Michael Kelley wrote:
>> In the NVM Express Revision 1.4 spec, Figure 145 describes possible
>> values for an AER with event type "Error" (value 000b). For a
>> Persistent Internal Error (value 03h), the host should perform a
>> controller reset.
>>
>> Add support for this error using code that already exists for
>> doing a controller reset. As part of this support, introduce
>> two utility functions for parsing the AER type and subtype.
>>
>> This new support was tested in a lab environment where we can
>> generate the persistent internal error on demand, and observe
>> both the Linux side and NVMe controller side to see that the
>> controller reset has been done.
>>
>>

Can you please clarify that which transports you have tested
such as RDMA, TCP, and PCIe ?

-ck