man/man9f/mac_prop_info.9f

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 You may only use this file in accordance with the terms of version
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 Copyright 2016 Joyent, Inc.

.Dd May 31, 2016
.Dt MAC_PROP_INFO 9F
.Os
.Sh NAME
.Nm mac_prop_info ,
.Nm mac_prop_info_set_default_link_flowctrl ,
.Nm mac_prop_info_set_default_str ,
.Nm mac_prop_info_set_default_uint8 ,
.Nm mac_prop_info_set_default_uint32 ,
.Nm mac_prop_info_set_default_uint64 ,
.Nm mac_prop_info_set_perm ,
.Nm mac_prop_info_set_range_uint32
.Nd mac property information functions
.Sh SYNOPSIS
n sys/mac_provider.h .Ft void
.Fo mac_prop_info_set_default_link_flowctrl
.Fa "mac_prop_info_handle_t hdl"
.Fa "link_flowctrl_t fctl"
.Fc
.Ft void
.Fo mac_prop_info_set_default_str
.Fa "mac_prop_info_handle_t hdl"
.Fa "const char *str"
.Fc
.Ft void
.Fo mac_prop_info_set_default_uint8
.Fa "mac_prop_info_handle_t hdl"
.Fa "uint8_t u8"
.Fc
.Ft void
.Fo mac_prop_info_set_default_uint16
.Fa "mac_prop_info_handle_t hdl"
.Fa "uint16_t u16"
.Fc
.Ft void
.Fo mac_prop_info_set_default_uint32
.Fa "mac_prop_info_handle_t hdl"
.Fa "uint32_t u32"
.Fc
.Ft void
.Fo mac_prop_info_set_perm
.Fa "mac_prop_info_handle_t hdl"
.Fa "uint8_t perm"
.Fc
.Ft void
.Fo mac_prop_info_set_range_uint32
.Fa "mac_prop_info_handle_t hdl"
.Fa "uint32_t low"
.Fa "uint32_t high"
.Fc
.Sh INTERFACE LEVEL
illumos DDI specific
.Sh PARAMETERS
l -tag -width Ds t Ft hdl A pointer to the MAC property information handle.
t Ft fctl A valid link flow control entry. Valid values are documented in the
.Sy MAC_PROP_FLOWCTRL
property description in the
.Sx PROPERTIES
section of
.Xr mac 9E .
t Ft str A null-terminated ASCII character string that describes that contains a
value of a property.
t Ft u8 An 8-bit unsigned value.
t Ft u16 An 16-bit unsigned value.
t Ft u32 An 32-bit unsigned value.
t Ft perm An 8-bit unsigned value which is the bitwise inclusive OR of the
following values:
l -tag -width Ds t Sy MAC_PROP_PERM_READ This flag indicates that a property is
.Sy readable .
t Sy MAC_PROP_PERM_WRITE This flag indicates that a property is
.Sy writable .
t Sy MAC_PROP_PERM_RW This flag indicates that a property is both
.Sy readable
and
.Sy writeable .
This is equivalent to specifying both
.Sy MAC_PROP_PERM_READ
and
.Sy MAC_PROP_PERM_WRITE .
.El
t Ft low A 32-bit unsigned value that represents the lowest possible value of an
integer property, generally inclusive.
t Ft high A 32-bit unsigned value that represents the highest possible value an
integer property, generally inclusive.
.El
.Sh DESCRIPTION
The
.Sy mac_prop_info
family of functions are used to fill in metadata about a given property
as part of a driver's
.Xr mc_propinfo 9E
entry point. These functions can be used to fill in information about
the default value that the device assigns to a property and the
permissions that a privileged user has to update the property.
p
The
.Fn mac_prop_info_set_perm
function is used to set the permissions of a property. These permissions
indicate whether or not the property can be read or modified from the
device driver's perspective. The permissions for a given property should
generally not change for a given device and they do not need to take
into account user privileges. For the most case, properties will only
take one of two values:
.Sy MAC_PROP_PERM_READ
or
.Sy MAC_PROP_PERM_RW .
Usually it does not make sense for a property to just have
.Sy MAC_PROP_PERM_WRITE .
p
Subsequent calls to the
.Fn mac_prop_info_set_perm
function will override the values stored in previous calls.
p
The
.Fn mac_prop_info_set_range_uint32
function is used to indicate a range of possible integer values that a
device may take. This range is generally inclusive, meaning the property
may be set to any value in the range of
.Fa low
to
.Fa high .
Each time the
.Fn mac_prop_info_set_range_uint32
function is called, a new property range is added, allowing for multiple
disjoint ranges to be specified for a given property.
p
The remaining functions,
.Fn mac_prop_info_set_default_link_flowctrl ,
.Fn mac_prop_info_set_default_str ,
.Fn mac_prop_info_set_uint8 ,
.Fn mac_prop_info_set_uint16 ,
.Fn mac_prop_info_set_uint32 ,
and
.Fn mac_prop_info_set_range_uint32
update the default value of a given property. The default value is the
initial value that the property takes after the device driver has called
.Xr mac_register 9F .
If these functions are called multiple times, then the default value
will be replaced with each call.
p
The different functions each support a different type of default value
and some are used for specific properties. The
.Fn mac_prop_info_set_default_link_flowctrl
function works with properties that describe flow control properties.
The various values of a
.Ft link_flowctrl_t
are documented in
.Xr mac 9E .
p
The
.Fn mac_prop_info_set_default_str
function sets the default value for properties that use strings. The
device driver should ensure that it uses alphanumeric ASCII characters
only in the string to guarantee portability.
p
The
.Fn mac_prop_info_set_default_uint8 ,
.Fn mac_prop_info_set_default_uint16 ,
and
.Fn mac_prop_info_set_default_uint32
functions set the default value for values whose properties are 8-, 16-,
and 32-bit unsigned values respectively.
.Sh CONTEXT
These functions are generally called on a handle passed into the
.Xr mc_propinfo 9E
entry point, though they function in both
.Sy user
and
.Sy kernel
context.
.Sh RETURN VALUES
All of the functions documented here do not return a value. It is not
the driver's responsibility to ensure that there is sufficient space for
permissions, ranges, or default values in the
.Ft mac_prop_info_handle_t
structures: the surrounding driver framework will transparently take
care of that and ensure that errors are correctly propagated.
.Sh SEE ALSO
.Xr mac 9E ,
.Xr mc_getprop 9E ,
.Xr mc_propinfo 9E ,
.Xr mc_setprop 9E