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################################################################################
# BSD LICENSE
#
# Copyright(c) 2023 Intel Corporation. All rights reserved.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Intel Corporation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
################################################################################
"Device information module."
import ctypes
from pqos.common import free_memory
from pqos.native_struct import CPqosChannel, CPqosDevinfo, PqosChannelT
from pqos.pqos import Pqos
class PqosDevInfo:
"Device information"
def __init__(self):
self.pqos = Pqos()
# Allow get_sysconfig() to raise an exception
sysconfig = self.pqos.get_sysconfig()
self.p_devinfo = sysconfig.dev
def get_channel_id(self, segment, bdf, virtual_channel):
"""
Reads control channel for device's virtual channel.
Parameters:
segment: device segment/domain
bdf: device ID
virtual_channel: device virtual channel
Returns:
channel or None on error
"""
func = self.pqos.lib.pqos_devinfo_get_channel_id
func.restype = PqosChannelT
func.argtypes = [
ctypes.POINTER(CPqosDevinfo),
ctypes.c_uint16,
ctypes.c_uint16,
ctypes.c_uint
]
result = func(self.p_devinfo, segment, bdf, virtual_channel)
if result == 0:
return None
return result
def get_channel_ids(self, segment, bdf):
"""
Reads control channels for device.
Parameters:
segment: device segment/domain
bdf: device ID
Returns:
a list of control channels or empty list
"""
func = self.pqos.lib.pqos_devinfo_get_channel_ids
func.restype = ctypes.POINTER(PqosChannelT)
func.argtypes = [
ctypes.POINTER(CPqosDevinfo),
ctypes.c_uint16,
ctypes.c_uint16,
ctypes.POINTER(ctypes.c_uint)
]
num_channels = ctypes.c_uint(0)
num_channels_ref = ctypes.byref(num_channels)
p_items = func(self.p_devinfo, segment, bdf, num_channels_ref)
if not p_items or num_channels.value <= 0:
return []
items = [p_items[i] for i in range(num_channels.value)]
free_memory(p_items)
return items
def get_channel(self, channel_id):
"""
Retrieves channel information from dev info structure.
Parameters:
channel_id: channel ID
Returns:
channel information or None on error
"""
func = self.pqos.lib.pqos_devinfo_get_channel
func.restype = ctypes.POINTER(CPqosChannel)
func.argtypes = [
ctypes.POINTER(CPqosDevinfo),
PqosChannelT
]
p_item = func(self.p_devinfo, channel_id)
if not p_item:
return None
item = p_item.contents
return item
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