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SubjectRe: [PATCH 6/7] scsi: pm8001: use dev_and_phy_addr_same() instead of open coded
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On 2022/9/22 22:24, John Garry wrote:
> On 17/09/2022 11:43, Jason Yan wrote:
>> The sas address comparation of domain device and expander phy is open
>> coded. Now we can replace it with dev_and_phy_addr_same().
>>
>> Signed-off-by: Jason Yan <yanaijie@huawei.com>
>> ---
>>   drivers/scsi/pm8001/pm8001_sas.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/scsi/pm8001/pm8001_sas.c
>> b/drivers/scsi/pm8001/pm8001_sas.c
>> index 8e3f2f9ddaac..bb1b1722f3ee 100644
>> --- a/drivers/scsi/pm8001/pm8001_sas.c
>> +++ b/drivers/scsi/pm8001/pm8001_sas.c
>> @@ -649,8 +649,7 @@ static int pm8001_dev_found_notify(struct
>> domain_device *dev)
>>           for (phy_id = 0; phy_id < parent_dev->ex_dev.num_phys;
>
> This code seems the same between many libsas LLDDs - could we factor it
> out into libsas? If so, then maybe those new helpers could be put in
> sas_internal.h

For the part of putting helpers in sas_internal.h, this needs to make
the helpers exported. I think it's not worth to do this because they are
very small. I'd still like to make them inline functions in libsas.h
such as:


diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 2dbead74a2af..e9e76c898287 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -648,6 +648,22 @@ static inline bool sas_is_internal_abort(struct
sas_task *task)
return task->task_proto == SAS_PROTOCOL_INTERNAL_ABORT;
}

+static inline int sas_find_attathed_phy(struct expander_device *ex_dev,
+ struct domain_device *dev)
+{
+ struct ex_phy *phy;
+ int phy_id;
+
+ for (phy_id = 0; phy_id < ex_dev->num_phys; phy_id++) {
+ phy = &ex_dev->ex_phy[phy_id];
+ if (SAS_ADDR(phy->attached_sas_addr)
+ == SAS_ADDR(dev->sas_addr))
+ return phy_id;
+ }
+
+ return ex_dev->num_phys;
+}
+
struct sas_domain_function_template {
/* The class calls these to notify the LLDD of an event. */
void (*lldd_port_formed)(struct asd_sas_phy *);


And the LLDDs change like:


diff --git a/drivers/scsi/pm8001/pm8001_sas.c
b/drivers/scsi/pm8001/pm8001_sas.c
index 8e3f2f9ddaac..4e7350609b3d 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -645,16 +645,8 @@ static int pm8001_dev_found_notify(struct
domain_device *dev)
pm8001_device->dcompletion = &completion;
if (parent_dev && dev_is_expander(parent_dev->dev_type)) {
int phy_id;
- struct ex_phy *phy;
- for (phy_id = 0; phy_id < parent_dev->ex_dev.num_phys;
- phy_id++) {
- phy = &parent_dev->ex_dev.ex_phy[phy_id];
- if (SAS_ADDR(phy->attached_sas_addr)
- == SAS_ADDR(dev->sas_addr)) {
- pm8001_device->attached_phy = phy_id;
- break;
- }
- }
+
+ phy_id = sas_find_attathed_phy(&parent_dev->ex_dev, dev);
if (phy_id == parent_dev->ex_dev.num_phys) {
pm8001_dbg(pm8001_ha, FAIL,
"Error: no attached dev:%016llx at
ex:%016llx.\n",
@@ -662,6 +654,7 @@ static int pm8001_dev_found_notify(struct
domain_device *dev)
SAS_ADDR(parent_dev->sas_addr));
res = -1;
}
+ pm8001_device->attached_phy = phy_id;
} else {
if (dev->dev_type == SAS_SATA_DEV) {
pm8001_device->attached_phy =

So I wonder if you have any reasons to insist exporting the helper?

>
> Thanks,
> John
>
>>           phy_id++) {
>>               phy = &parent_dev->ex_dev.ex_phy[phy_id];
>> -            if (SAS_ADDR(phy->attached_sas_addr)
>> -                == SAS_ADDR(dev->sas_addr)) {
>> +            if (dev_and_phy_addr_same(dev, phy)) {
>>                   pm8001_device->attached_phy = phy_id;
>>                   break;
>>               }
>
> .

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