Re: [PATCH RFC v2 12/24] hpsa: use reserved commands

John Garry
2020-03-30T13:43:08Z

On 17/03/2020 09:48, Hannes Reinecke wrote:
> On 3/17/20 10:38 AM, John Garry wrote:
>> On 11/03/2020 08:10, Ming Lei wrote:
>>>> ands(struct ctlr_info *h)
>>>> @@ -5803,6 +5803,7 @@ static int hpsa_scsi_host_alloc(struct
>>>> ctlr_info *h)
>>>>       sh->max_lun = HPSA_MAX_LUN;
>>>>       sh->max_id = HPSA_MAX_LUN;
>>>>       sh->can_queue = h->nr_cmds - HPSA_NRESERVED_CMDS;
>>>> +    sh->nr_reserved_cmds = HPSA_NRESERVED_CMDS;
>>> Now .nr_reserved_cmds has been passed to blk-mq, you need to increase
>>> sh->can_queue to h->nr_cmds, because .can_queue is the whole queue depth
>>> (include the part of reserved tags), otherwise, IO tags will be
>>> decreased.
>>>
>>
>> Sounds correct.
>>
> I will have having a look at the patchset; I thought I did a patch to
> modify .can_queue so that it would cover only the usable tags, not the
> reserved ones.
>

To me, it makes sense to leave .can_queue unmodified, carry it down to
blk-mq and allow blk_mq_init_bitmap_tags() find the queue depth:

static struct blk_mq_tags *blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
int node, int alloc_policy)
{
unsigned int depth = tags->nr_tags - tags->nr_reserved_tags; *
bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;

if (bt_alloc(&tags->bitmap_tags, depth, round_robin, node))
goto free_tags;

Cheers,
John