From: John Garry <john.garry@huawei.com>
To: Hannes Reinecke <hare@suse.de>,
Bart Van Assche <bvanassche@acm.org>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Cc: <satishkh@cisco.com>, <sebaddel@cisco.com>, <kartilak@cisco.com>,
<jejb@linux.ibm.com>, <linux-scsi@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <hch@lst.de>
Subject: Re: [PATCH 0/3] Remove scsi_cmnd.tag
Date: Thu, 19 Aug 2021 10:09:27 +0100 [thread overview]
Message-ID: <6c83bd7f-9fd2-1b43-627f-615467fa55d4@huawei.com> (raw)
In-Reply-To: <6090371d-9688-11ae-8219-ba9929a96526@suse.de>
On 19/08/2021 08:50, Hannes Reinecke wrote:
>>> select CPU_32v4 if ARCH_RPC
>>
>> Does that build fully for xconfig or any others which you tried?
>>
> > Yep, xconfig and full build works.
>
> Well.
>
> Would've worked if you hadn't messed up tag handling for acornscsi :-)
> > Besides: tag handling in acornscsi (and fas216, for that matter) seems
> to be completely broken.
>
> Consider this beauty:
>
> #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
> /*
> * tagged queueing - allocate a new tag to this command
> */
> if (SCpnt->device->simple_tags) {
> SCpnt->device->current_tag += 1;
> if (SCpnt->device->current_tag == 0)
> SCpnt->device->current_tag = 1;
> SCpnt->tag = SCpnt->device->current_tag;
> } else
> #endif
So isn't this just using the scsi_cmnd.tag as it own scribble?
>
> which is broken on _soo many_ counts.
> Not only does it try to allocate its own tags, the code also assumes
> that a tag value of '0' indicates that tagged queueing is not active:
>
In case you missed it, Arnd B tried to clear out some old platforms
earlier this year. With respect to rpc, Russell King apparently still
uses it and has some SCSI patches:
https://lore.kernel.org/lkml/20210109174357.GB1551@shell.armlinux.org.uk/
I wonder what they are and maybe we can check. Anyway... I'd run any
changes by him...
> static
> void acornscsi_abortcmd(AS_Host *host, unsigned char tag)
> {
> host->scsi.phase = PHASE_ABORTED;
> sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN);
>
> msgqueue_flush(&host->scsi.msgs);
> #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE
> if (tag)
> msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag);
> else
> #endif
> msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
> }
>
> And, of course, there's the usual confusion about when to check for
> sdev->tagged_supported and sdev->simple_tags.
>
> Drop me a note if I can give a hand.
Thanks! Let's see what happens to the series which you just sent.
next prev parent reply other threads:[~2021-08-19 9:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 13:49 [PATCH 0/3] Remove scsi_cmnd.tag John Garry
2021-08-13 13:49 ` [PATCH 1/3] scsi: wd719: Stop using scsi_cmnd.tag John Garry
2021-08-13 16:30 ` Hannes Reinecke
2021-08-14 3:11 ` Bart Van Assche
2021-08-13 13:49 ` [PATCH 2/3] scsi: fnic: Stop setting scsi_cmnd.tag John Garry
2021-08-13 16:31 ` Hannes Reinecke
2021-08-14 3:17 ` Bart Van Assche
2021-08-14 7:39 ` Christoph Hellwig
2021-08-14 12:35 ` Hannes Reinecke
2021-08-16 10:00 ` John Garry
2021-08-16 11:11 ` Hannes Reinecke
2021-08-13 13:49 ` [PATCH 3/3] scsi: Remove scsi_cmnd.tag John Garry
2021-08-13 16:31 ` Hannes Reinecke
2021-08-14 3:18 ` Bart Van Assche
2021-08-14 7:40 ` [PATCH 0/3] " Christoph Hellwig
2021-08-16 17:34 ` Martin K. Petersen
2021-08-18 18:08 ` John Garry
2021-08-18 18:46 ` Martin K. Petersen
2021-08-19 2:41 ` Bart Van Assche
2021-08-19 7:15 ` Hannes Reinecke
2021-08-19 7:27 ` John Garry
2021-08-19 7:50 ` Hannes Reinecke
2021-08-19 9:09 ` John Garry [this message]
2021-08-24 4:03 ` Martin K. Petersen
2021-08-24 7:54 ` John Garry
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