linux-kernel - Re: [PATCH 2/4] xen/scsiback: use new command result macros

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Date:   Thu, 21 Apr 2022 16:56:40 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH 2/4] xen/scsiback: use new command result macros


On 4/21/22 4:40 AM, Juergen Gross wrote:
> On 20.04.22 18:12, Boris Ostrovsky wrote:
>>
>> On 4/20/22 5:25 AM, Juergen Gross wrote:
>>> @@ -569,7 +645,7 @@ static void scsiback_device_action(struct vscsibk_pend *pending_req,
>>>       wait_for_completion(&pending_req->tmr_done);
>>>       err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
>>> -        SUCCESS : FAILED;
>>> +        XEN_VSCSIIF_RSLT_RESET_SUCCESS : XEN_VSCSIIF_RSLT_RESET_FAILED;
>>>       scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
>>>       transport_generic_free_cmd(&pending_req->se_cmd, 0);
>>
>>
>> You also want to initialize err to XEN_VSCSIIF_RSLT_RESET_FAILED.
>
> I did that.


Yes you did. I don't know what I was was looking at.


>
>> And also looking at invocations of scsiback_do_resp_with_sense() I think those may need to be adjusted as well.
>
> No, the invocations are fine, but scsiback_result() needs to pass through
> the lowest 16 bits instead of only the lowest 8 bits of the result value.
>

What I was thinking was that this could use the reverse of XEN_VSCSIIF_RSLT_HOST(), i.e. something like

#define RSLT_HOST_TO_XEN_VSCSIIF(x)   ((x)<<16)

to be explicit about namespaces.


BTW, should scsiback_result() use XEN_VSCSIIF_RSLT_HOST() at the top?


-boris