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# Copyright (c) 2021 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""IRQ handling library."""
from resources.libraries.python.CpuUtils import CpuUtils
from resources.libraries.python.InterfaceUtil import InterfaceUtil
from resources.libraries.python.ssh import exec_cmd_no_error
from resources.libraries.python.topology import Topology
class IrqUtil:
"""Contains methods for managing IRQs."""
@staticmethod
def get_pci_interface_irqs(node, pci_addr):
"""Get IRQs for interface in linux specified by PCI address.
:param node: Topology node.
:param pci_addr: Linux interface PCI address.
:type node: dict
:type pci_addr: str
:returns: List of IRQs attached to specified interface.
:rtype: list
"""
interface = InterfaceUtil.pci_to_eth(node, pci_addr)
return IrqUtil.get_interface_irqs(node, interface)
@staticmethod
def get_interface_irqs(node, interface):
"""Get IRQs for interface in linux.
:param node: Topology node.
:param interface: Linux interface name.
:type node: dict
:type interface: str
:returns: List of IRQs attached to specified interface.
:rtype: list
"""
irqs = []
command = f"grep '{interface}-.*TxRx' /proc/interrupts | cut -f1 -d:"
message = f"Failed to get IRQs for {interface} on {node['host']}!"
stdout, _ = exec_cmd_no_error(
node, command, timeout=30, sudo=True, message=message
)
for line in stdout.splitlines():
irqs.append(int(line.strip()))
return irqs
@staticmethod
def set_interface_irqs_affinity(node, interface, cpu_skip_cnt=0, cpu_cnt=1):
"""Set IRQs affinity for interface in linux.
:param node: Topology node.
:param interface: Topology interface.
:param cpu_skip_cnt: Amount of CPU cores to skip.
:param cpu_cnt: CPU threads count. (Optional, Default: 0)
:param cpu_list: List of CPUs. (Optional, Default: 1)
:type node: dict
:type interface: str
:type cpu_skip_cnt: int
:type cpu_cnt: int
"""
cpu_list = CpuUtils.get_affinity_af_xdp(
node, interface, cpu_skip_cnt=cpu_skip_cnt, cpu_cnt=cpu_cnt
)
interface = Topology.get_interface_name(node, interface)
irq_list = IrqUtil.get_interface_irqs(node, interface)
for irq, cpu in zip(irq_list, cpu_list):
if cpu < 32:
mask = 1 << cpu
mask = f"{mask:x}"
else:
groups = int(cpu/32)
mask_fill = u""
for _ in range(groups):
mask_fill = f"{mask_fill},00000000"
mask = 1 << (cpu - (32 * groups))
mask = f"{mask:x}{mask_fill}"
command = f"sh -c 'echo {mask} > /proc/irq/{irq}/smp_affinity'"
message = f"Failed to set IRQ affinity for {irq} on {node['host']}!"
exec_cmd_no_error(
node, command, timeout=30, sudo=True, message=message
)
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