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From: Hannes Reinecke <hare@suse.de>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
	linux-block <linux-block@vger.kernel.org>,
	Linux SCSI List <linux-scsi@vger.kernel.org>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	Bart Van Assche <bvanassche@acm.org>,
	Hannes Reinecke <hare@suse.com>,
	John Garry <john.garry@huawei.com>,
	Don Brace <don.brace@microsemi.com>,
	Kashyap Desai <kashyap.desai@broadcom.com>,
	Sathya Prakash <sathya.prakash@broadcom.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 6/9] scsi: hpsa: convert private reply queue to blk-mq hw queue
Date: Fri, 31 May 2019 08:40:16 +0200
Message-ID: <72604eb8-ce6e-3455-016e-d21044bbaf8f@suse.de> (raw)
In-Reply-To: <CACVXFVMFVqD3797qfe8K5bZnwv7fSqP7oz3AMyQLKWKH8Z89FA@mail.gmail.com>

On 5/31/19 8:30 AM, Ming Lei wrote:
> On Fri, May 31, 2019 at 2:15 PM Hannes Reinecke <hare@suse.de> wrote:
>>
>> On 5/31/19 4:27 AM, Ming Lei wrote:
>>> SCSI's reply qeueue is very similar with blk-mq's hw queue, both
>>> assigned by IRQ vector, so map te private reply queue into blk-mq's hw
>>> queue via .host_tagset.
>>>
>>> Then the private reply mapping can be removed.
>>>
>>> Another benefit is that the request/irq lost issue may be solved in
>>> generic approach because managed IRQ may be shutdown during CPU
>>> hotplug.
>>>
>>> Signed-off-by: Ming Lei <ming.lei@redhat.com>
>>> ---
>>>  drivers/scsi/hpsa.c | 49 ++++++++++++++++++---------------------------
>>>  1 file changed, 19 insertions(+), 30 deletions(-)
>>>
>> There had been requests to make the internal interrupt mapping optional;
>> but I guess we first should
> 
> For HPSA, either managed IRQ is used or single MSI-X vector is allocated,
> I am pretty sure that both cases are covered in this patch, so not sure what the
> 'optional' means.
> 
>>> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
>>> index 1bef1da273c2..c7136f9f0ce1 100644
>>> --- a/drivers/scsi/hpsa.c
>>> +++ b/drivers/scsi/hpsa.c
>>> @@ -51,6 +51,7 @@
>>>  #include <linux/jiffies.h>
>>>  #include <linux/percpu-defs.h>
>>>  #include <linux/percpu.h>
>>> +#include <linux/blk-mq-pci.h>
>>>  #include <asm/unaligned.h>
>>>  #include <asm/div64.h>
>>>  #include "hpsa_cmd.h"
>>> @@ -902,6 +903,18 @@ static ssize_t host_show_legacy_board(struct device *dev,
>>>       return snprintf(buf, 20, "%d\n", h->legacy_board ? 1 : 0);
>>>  }
>>>
>>> +static int hpsa_map_queues(struct Scsi_Host *shost)
>>> +{
>>> +     struct ctlr_info *h = shost_to_hba(shost);
>>> +     struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
>>> +
>>> +     /* Switch to cpu mapping in case that managed IRQ isn't used */
>>> +     if (shost->nr_hw_queues > 1)
>>> +             return blk_mq_pci_map_queues(qmap, h->pdev, 0);
>>> +     else
>>> +             return blk_mq_map_queues(qmap);
>>> +}
>>> +
>>>  static DEVICE_ATTR_RO(raid_level);
>>>  static DEVICE_ATTR_RO(lunid);
>>>  static DEVICE_ATTR_RO(unique_id);
>> This helper is pretty much shared between all converted drivers.
>> Shouldn't we have a common function here?
>> Something like
>>
>> scsi_mq_host_tag_map(struct Scsi_Host *shost, int offset)?
> 
> I am not sure if the common helper is helpful much, since the
> condition for using
> cpu map or pci map still depends on driver private state, we still
> have to define
> each driver's .map_queues too.
> 
> Also PCI device pointer has to be provided.
> 
Hmm. Okay, so let's keep it this way.

Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@suse.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)

  reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-31  2:27 [PATCH 0/9] blk-mq/scsi: convert private reply queue into blk_mq " Ming Lei
2019-05-31  2:27 ` [PATCH 1/9] blk-mq: allow hw queues to share hostwide tags Ming Lei
2019-05-31  6:07   ` Hannes Reinecke
2019-05-31 15:37   ` Bart Van Assche
2019-06-24  8:44     ` Ming Lei
2019-06-05 14:10   ` John Garry
2019-06-24  8:46     ` Ming Lei
2019-06-24 13:14       ` John Garry
2019-05-31  2:27 ` [PATCH 2/9] block: null_blk: introduce module parameter of 'g_host_tags' Ming Lei
2019-05-31  6:08   ` Hannes Reinecke
2019-05-31 15:39   ` Bart Van Assche
2019-06-24  8:43     ` Ming Lei
2019-06-02  1:56   ` Minwoo Im
2019-05-31  2:27 ` [PATCH 3/9] scsi: Add template flag 'host_tagset' Ming Lei
2019-05-31  6:08   ` Hannes Reinecke
2019-05-31  2:27 ` [PATCH 4/9] scsi_debug: support host tagset Ming Lei
2019-05-31  6:09   ` Hannes Reinecke
2019-06-02  2:03   ` Minwoo Im
2019-06-02 17:01   ` Douglas Gilbert
2019-05-31  2:27 ` [PATCH 5/9] scsi: introduce scsi_cmnd_hctx_index() Ming Lei
2019-05-31  6:10   ` Hannes Reinecke
2019-05-31  2:27 ` [PATCH 6/9] scsi: hpsa: convert private reply queue to blk-mq hw queue Ming Lei
2019-05-31  6:15   ` Hannes Reinecke
2019-05-31  6:30     ` Ming Lei
2019-05-31  6:40       ` Hannes Reinecke [this message]
2019-05-31  2:27 ` [PATCH 7/9] scsi: hisi_sas_v3: " Ming Lei
2019-05-31  6:20   ` Hannes Reinecke
2019-05-31  6:34     ` Ming Lei
2019-05-31  6:42       ` Hannes Reinecke
2019-05-31  7:14         ` Ming Lei
2019-05-31 11:38       ` John Garry
2019-06-03 11:00         ` Ming Lei
2019-06-03 13:00           ` John Garry
2019-06-04 13:37             ` Ming Lei
2019-05-31  2:28 ` [PATCH 8/9] scsi: megaraid: " Ming Lei
2019-05-31  6:22   ` Hannes Reinecke
2019-06-01 21:41   ` Kashyap Desai
2019-06-02  6:42     ` Ming Lei
2019-06-02  7:48       ` Ming Lei
2019-06-02 16:34         ` Kashyap Desai
2019-06-03  3:56           ` Ming Lei
2019-06-03 10:00             ` Kashyap Desai
2019-06-07  9:45             ` Kashyap Desai
2019-05-31  2:28 ` [PATCH 9/9] scsi: mp3sas: " Ming Lei
2019-05-31  6:23   ` Hannes Reinecke
2019-06-06 11:58   ` Sreekanth Reddy
2019-06-04  8:49 ` [PATCH 0/9] blk-mq/scsi: convert private reply queue into blk_mq " John Garry
2019-08-13  8:30   ` John Garry

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