Wed, Jul 13, 2022 at 08:40:50AM CEST, vikas.gupta@xxxxxxxxxxxx wrote:
>Hi Jiri,
>
>On Tue, Jul 12, 2022 at 11:38 PM Jiri Pirko <jiri@xxxxxxxxxxx> wrote:
>>
>> Tue, Jul 12, 2022 at 06:41:49PM CEST, vikas.gupta@xxxxxxxxxxxx wrote:
>> >Hi Jiri,
>> >
>> >On Tue, Jul 12, 2022 at 11:58 AM Jiri Pirko <jiri@xxxxxxxxxx> wrote:
>> >>
>> >> Tue, Jul 12, 2022 at 08:16:11AM CEST, vikas.gupta@xxxxxxxxxxxx wrote:
>> >> >Hi Jiri,
>> >> >
>> >> >On Mon, Jul 11, 2022 at 6:10 PM Jiri Pirko <jiri@xxxxxxxxxx> wrote:
>> >> >
>> >> >> Thu, Jul 07, 2022 at 08:29:48PM CEST, vikas.gupta@xxxxxxxxxxxx wrote:
>>
>> [...]
>>
>>
>> >> >> > * enum devlink_trap_action - Packet trap action.
>> >> >> > * @DEVLINK_TRAP_ACTION_DROP: Packet is dropped by the device and a copy
>> >> >> is not
>> >> >> >@@ -576,6 +598,10 @@ enum devlink_attr {
>> >> >> > DEVLINK_ATTR_LINECARD_TYPE, /* string */
>> >> >> > DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES, /* nested */
>> >> >> >
>> >> >> >+ DEVLINK_ATTR_SELFTESTS_MASK, /* u32 */
>> >> >>
>> >> >> I don't see why this is u32 bitset. Just have one attr per test
>> >> >> (NLA_FLAG) in a nested attr instead.
>> >> >>
>> >> >
>> >> >As per your suggestion, for an example it should be like as below
>> >> >
>> >> > DEVLINK_ATTR_SELFTESTS, /* nested */
>> >> >
>> >> > DEVLINK_ATTR_SELFTESTS_SOMETEST1 /* flag */
>> >> >
>> >> > DEVLINK_ATTR_SELFTESTS_SOMETEST2 /* flag */
>> >>
>> >> Yeah, but have the flags in separate enum, no need to pullute the
>> >> devlink_attr enum by them.
>> >>
>> >>
>> >> >
>> >> >.... <SOME MORE TESTS>
>> >> >
>> >> >.....
>> >> >
>> >> > DEVLINK_ATTR_SLEFTESTS_RESULT_VAL, /* u8 */
>> >> >
>> >> >
>> >> >
>> >> > If we have this way then we need to have a mapping (probably a function)
>> >> >for drivers to tell them what tests need to be executed based on the flags
>> >> >that are set.
>> >> > Does this look OK?
>> >> > The rationale behind choosing a mask is that we could directly pass the
>> >> >mask-value to the drivers.
>> >>
>> >> If you have separate enum, you can use the attrs as bits internally in
>> >> kernel. Add a helper that would help the driver to work with it.
>> >> Pass a struct containing u32 (or u8) not to drivers. Once there are more
>> >> tests than that, this structure can be easily extended and the helpers
>> >> changed. This would make this scalable. No need for UAPI change or even
>> >> internel driver api change.
>> >
>> >As per your suggestion, selftest attributes can be declared in separate
>> >enum as below
>> >
>> >enum {
>> >
>> > DEVLINK_SELFTEST_SOMETEST, /* flag */
>> >
>> > DEVLINK_SELFTEST_SOMETEST1,
>> >
>> > DEVLINK_SELFTEST_SOMETEST2,
>> >
>> >....
>> >
>> >......
>> >
>> > __DEVLINK_SELFTEST_MAX,
>> >
>> > DEVLINK_SELFTEST_MAX = __DEVLINK_SELFTEST_MAX - 1
>> >
>> >};
>> >Below examples could be the flow of parameters/data from user to
>> >kernel and vice-versa
>> >
>> >
>> >Kernel to user for show command . Users can know what all tests are
>> >supported by the driver. A return from kernel to user.
>> >______
>> >|NEST |
>> >|_____ |TEST1|TEST4|TEST7|...
>> >
>> >
>> >User to kernel to execute test: If user wants to execute test4, test8, test1...
>> >______
>> >|NEST |
>> >|_____ |TEST4|TEST8|TEST1|...
>> >
>> >
>> >Result Kernel to user execute test RES(u8)
>> >______
>> >|NEST |
>> >|_____ |RES4|RES8|RES1|...
>>
>> Hmm, I think it is not good idea to rely on the order, a netlink library
>> can perhaps reorder it? Not sure here.
>>
>> >
>> >Results are populated in the same order as the user passed the TESTs
>> >flags. Does the above result format from kernel to user look OK ?
>> >Else we need to have below way to form a result format, a nest should
>> >be made for <test_flag,
>> >result> but since test flags are in different enum other than
>> >devlink_attr and RES being part of devlink_attr, I believe it's not
>> >good practice to make the below structure.
>>
>> Not a structure, no. Have it as another nest (could be the same attr as
>> the parent nest:
>>
>> ______
>> |NEST |
>> |_____ |NEST| |NEST| |NEST|
>> TEST4,RES4 TEST8,RES8 TEST1, RES1
>>
>> also, it is flexible to add another attr if needed (like maybe result
>> message string containing error message? IDK).
>
>For above nesting we can have the attributes defined as below
>
>Attribute in devlink_attr
>enum devlink_attr {
> ....
> ....
> DEVLINK_SELFTESTS_INFO, /* nested */
> ...
>...
>}
>
>enum devlink_selftests {
> DEVLINK_SELFTESTS_SOMETEST0, /* flag */
> DEVLINK_SELFTESTS_SOMETEST1,
> DEVLINK_SELFTESTS_SOMETEST2,
> ...
> ...
>}
>
>enum devlink_selftest_result {
for attrs, have "attr" in the name of the enum and "ATTR" in name of the
value.
> DEVLINK_SELFTESTS_RESULT, /* nested */
> DEVLINK_SELFTESTS_TESTNUM, /* u32 indicating the test
You can have 1 enum, containing both these and the test flags from
above.
>number in devlink_selftests enum */
> DEVLINK_SELFTESTS_RESULT_VAL, /* u8 skip, pass, fail.. */
Put enum name in the comment, instead of list possible values.
> ...some future attrr...
>
>}
>enums in devlink_selftest_result can be put in devlink_attr though.
You can have them separate, I think it is about the time we try to put
new attrs what does not have potencial to be re-used to a separate enum.
>
>Does this look OK?
>
>Thanks,
>Vikas
>
>>
>>
>>
>> >______
>> >|NEST |
>> >|_____ | TEST4, RES4|TEST8,RES8|TEST1,RES1|...
>> >
>> >Let me know if my understanding is correct.
>>
>> [...]
