Re: [PATCH RFC v3 03/22] scsi: core: Implement reserved command handling

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On 27/10/2022 08:51, Hannes Reinecke wrote:

Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
#jpg: Set tag_set->queue_depth = shost->can_queue, and not
= shost->can_queue + shost->nr_reserved_cmds;
Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
  drivers/scsi/hosts.c     |  3 +++
  drivers/scsi/scsi_lib.c  |  2 ++
  include/scsi/scsi_host.h | 15 ++++++++++++++-
  3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 12346e2297fd..db89afc37bc9 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -489,6 +489,9 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
      if (sht->virt_boundary_mask)
          shost->virt_boundary_mask = sht->virt_boundary_mask;
+    if (sht->nr_reserved_cmds)
+        shost->nr_reserved_cmds = sht->nr_reserved_cmds;
+

Nit: the if is not really necessary I think. But it does not hurt.

Yes, we do.
Not all HBAs are able to figure out the number of reserved commands upfront; some modify that based on the PCI device used etc.
So I'd keep it for now.

I think logically Damien is right as in the shost alloc shost->nr_reserved_cmds is initially zero, so:

if (sht->nr_reserved_cmds)
       shost->nr_reserved_cmds = sht->nr_reserved_cmds;

is same as simply:

	shost->nr_reserved_cmds = sht->nr_reserved_cmds;

However I am just copying the coding style.

Thanks,
John



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