+++ /dev/null
-#!/usr/bin/env python3
-# SPDX-License-Identifier: BSD-3-Clause
-# Copyright(c) 2020 Intel Corporation
-
-"""
-Configure an entire Intel DSA instance, using idxd kernel driver, for DPDK use
-"""
-
-import sys
-import argparse
-import os
-import os.path
-
-
-class SysfsDir:
- "Used to read/write paths in a sysfs directory"
- def __init__(self, path):
- self.path = path
-
- def read_int(self, filename):
- "Return a value from sysfs file"
- with open(os.path.join(self.path, filename)) as f:
- return int(f.readline())
-
- def write_values(self, values):
- "write dictionary, where key is filename and value is value to write"
- for filename, contents in values.items():
- with open(os.path.join(self.path, filename), "w") as f:
- f.write(str(contents))
-
-
-def reset_device(dsa_id):
- "Reset the DSA device and all its queues"
- drv_dir = SysfsDir("/sys/bus/dsa/drivers/dsa")
- drv_dir.write_values({"unbind": f"dsa{dsa_id}"})
-
-
-def get_pci_dir(pci):
- "Search for the sysfs directory of the PCI device"
- base_dir = '/sys/bus/pci/devices/'
- for path, dirs, files in os.walk(base_dir):
- for dir in dirs:
- if pci in dir:
- return os.path.join(base_dir, dir)
- sys.exit(f"Could not find sysfs directory for device {pci}")
-
-
-def get_dsa_id(pci):
- "Get the DSA instance ID using the PCI address of the device"
- pci_dir = get_pci_dir(pci)
- for path, dirs, files in os.walk(pci_dir):
- for dir in dirs:
- if dir.startswith('dsa') and 'wq' not in dir:
- return int(dir[3:])
- sys.exit(f"Could not get device ID for device {pci}")
-
-
-def configure_dsa(dsa_id, queues, prefix):
- "Configure the DSA instance with appropriate number of queues"
- dsa_dir = SysfsDir(f"/sys/bus/dsa/devices/dsa{dsa_id}")
- drv_dir = SysfsDir("/sys/bus/dsa/drivers/dsa")
-
- max_groups = dsa_dir.read_int("max_groups")
- max_engines = dsa_dir.read_int("max_engines")
- max_queues = dsa_dir.read_int("max_work_queues")
- max_tokens = dsa_dir.read_int("max_tokens")
-
- nb_queues = min(queues, max_queues)
- if queues > nb_queues:
- print(f"Setting number of queues to max supported value: {max_queues}")
-
- # we want one engine per group, and no more engines than queues
- nb_groups = min(max_engines, max_groups, nb_queues)
- for grp in range(nb_groups):
- dsa_dir.write_values({f"engine{dsa_id}.{grp}/group_id": grp})
-
- # configure each queue
- for q in range(nb_queues):
- wq_dir = SysfsDir(os.path.join(dsa_dir.path, f"wq{dsa_id}.{q}"))
- wq_dir.write_values({"group_id": q % nb_groups,
- "type": "user",
- "mode": "dedicated",
- "name": f"{prefix}_wq{dsa_id}.{q}",
- "priority": 1,
- "size": int(max_tokens / nb_queues)})
-
- # enable device and then queues
- drv_dir.write_values({"bind": f"dsa{dsa_id}"})
- for q in range(nb_queues):
- drv_dir.write_values({"bind": f"wq{dsa_id}.{q}"})
-
-
-def main(args):
- "Main function, does arg parsing and calls config function"
- arg_p = argparse.ArgumentParser(
- description="Configure whole DSA device instance for DPDK use")
- arg_p.add_argument('dsa_id',
- help="Specify DSA instance either via DSA instance number or PCI address")
- arg_p.add_argument('-q', metavar='queues', type=int, default=255,
- help="Number of queues to set up")
- arg_p.add_argument('--name-prefix', metavar='prefix', dest='prefix',
- default="dpdk",
- help="Prefix for workqueue name to mark for DPDK use [default: 'dpdk']")
- arg_p.add_argument('--reset', action='store_true',
- help="Reset DSA device and its queues")
- parsed_args = arg_p.parse_args(args[1:])
-
- dsa_id = parsed_args.dsa_id
- dsa_id = get_dsa_id(dsa_id) if ':' in dsa_id else dsa_id
- if parsed_args.reset:
- reset_device(dsa_id)
- else:
- configure_dsa(dsa_id, parsed_args.q, parsed_args.prefix)
-
-
-if __name__ == "__main__":
- main(sys.argv)
git.droids-corp.org / dpdk.git / blobdiff