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Description
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After the putback of CR 6659866 the semantics of pd_defval have been
modified. In order to make it easy to add new properties, the following
comments need to be added:
> If defaults are not defined for the prop, the pd_defval.vd_name should
> be null. If the driver has to be contacted for the value, the vd_name
> should be the empty string (""). Otherwise, dladm will just print
> whatever is in the table (see lines 699-710 of linkprop.c).
Relation to PD_EMPTY_RESET:
The PD_EMPTY_RESET is used for properties like zone where the "" itself
is used to reset the property. So libdladm can copy pdp->pd_defval
over to the val_desc_t passed down on the setprop using the global
values in the table.
For other cases (PD_EMPTY_RESET is not set, vd_name is ""), doing
reset-linkprop will cause libdladm to do a getprop to find the
default value and then do a setprop to reset the value to default.
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