linux-kernel - Re: [PATCH V2] mpt3sas: support target smid for [abort|query] task

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Date:   Fri, 26 Jul 2019 01:53:27 +0900
From:   Minwoo Im <minwoo.im.dev@...il.com>
To:     Sreekanth Reddy <sreekanth.reddy@...adcom.com>
Cc:     Hannes Reinecke <hare@...e.de>, minwoo.im@...sung.com,
        "sathya.prakash@...adcom.com" <sathya.prakash@...adcom.com>,
        "suganath-prabu.subramani@...adcom.com" 
        <suganath-prabu.subramani@...adcom.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "MPT-FusionLinux.pdl@...adcom.com" <MPT-FusionLinux.pdl@...adcom.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Euihyeok Kwon <eh81.kwon@...sung.com>,
        Sarah Cho <sohyeon.jo@...sung.com>,
        Sanggwan Lee <sanggwan.lee@...sung.com>,
        Gyeongmin Nam <gm.nam@...sung.com>,
        Sungjun Park <sj1228.park@...sung.com>,
        Minwoo Im <minwoo.im.dev@...il.com>
Subject: Re: [PATCH V2] mpt3sas: support target smid for [abort|query] task

On 19-07-23 16:57:49, Sreekanth Reddy wrote:
> On Mon, Jul 15, 2019 at 11:43 AM Hannes Reinecke <hare@...e.de> wrote:
> > I think this is fundamentally wrong.
> > ABORT_TASK is used to abort a single task, which of course has to be
> > known beforehand. If you don't know the task, what exactly do you hope
> > to achieve here? Aborting random I/O?
> > Or, even worse, aborting I/O the driver uses internally and corrupt the
> > internal workflow of the driver?
> >
> > We should simply disallow any ABORT TASK from userspace if the TaskMID
> > is zero. And I would even argue to disabllow ABORT TASK from userspace
> > completely, as the smid is never relayed to userland, and as such the
> > user cannot know which task should be aborted.
> 
> Hannes,
> 
> This interface was added long time back in mpt2sas driver and I don't
> have exact reason of adding this interface at that time.
> But I know that this interface is still used by BRCM test team & few
> customers only for some functionality and regression testing.

Sreekanth, and Hannes,

Could you please give some review points on this?

Thanks,