From d14d2f30ef592db14777228cb9d8f592f9d87d98 Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Sun, 21 Feb 2021 18:22:04 +0100
Subject: ethernet: T3163: probe driver for maximum rx/tx ring-buffer size
(cherry picked from commit cf1156a60e1d03a752cde0baadbc9ac8118b2a52)
---
python/vyos/ethtool.py | 101 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)
create mode 100644 python/vyos/ethtool.py
(limited to 'python/vyos')
diff --git a/python/vyos/ethtool.py b/python/vyos/ethtool.py
new file mode 100644
index 000000000..cef7d476f
--- /dev/null
+++ b/python/vyos/ethtool.py
@@ -0,0 +1,101 @@
+# Copyright 2021 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+from vyos.util import cmd
+
+class Ethtool:
+ """
+ Class is used to retrive and cache information about an ethernet adapter
+ """
+
+ # dictionary containing driver featurs, it will be populated on demand and
+ # the content will look like:
+ # {
+ # 'tls-hw-tx-offload': {'fixed': True, 'on': False},
+ # 'tx-checksum-fcoe-crc': {'fixed': True, 'on': False},
+ # 'tx-checksum-ip-generic': {'fixed': False, 'on': True},
+ # 'tx-checksum-ipv4': {'fixed': True, 'on': False},
+ # 'tx-checksum-ipv6': {'fixed': True, 'on': False},
+ # 'tx-checksum-sctp': {'fixed': True, 'on': False},
+ # 'tx-checksumming': {'fixed': False, 'on': True},
+ # 'tx-esp-segmentation': {'fixed': True, 'on': False},
+ # }
+ features = { }
+ ring_buffers = { }
+
+ def __init__(self, ifname):
+ # Now populate features dictionaty
+ tmp = cmd(f'ethtool -k {ifname}')
+ # skip the first line, it only says: "Features for eth0":
+ for line in tmp.splitlines()[1:]:
+ if ":" in line:
+ key, value = [s.strip() for s in line.strip().split(":", 1)]
+ fixed = "fixed" in value
+ if fixed:
+ value = value.split()[0].strip()
+ self.features[key.strip()] = {
+ "on": value == "on",
+ "fixed": fixed
+ }
+
+ tmp = cmd(f'ethtool -g {ifname}')
+ # We are only interested in line 2-5 which contains the device maximum
+ # ringbuffers
+ for line in tmp.splitlines()[2:6]:
+ if ':' in line:
+ key, value = [s.strip() for s in line.strip().split(":", 1)]
+ key = key.lower().replace(' ', '_')
+ self.ring_buffers[key] = int(value)
+
+
+ def is_fixed_lro(self):
+ # in case of a missing configuration, rather return "fixed". In Ethtool
+ # terminology "fixed" means the setting can not be changed by the user.
+ return self.features.get('large-receive-offload', True).get('fixed', True)
+
+ def is_fixed_gro(self):
+ # in case of a missing configuration, rather return "fixed". In Ethtool
+ # terminology "fixed" means the setting can not be changed by the user.
+ return self.features.get('generic-receive-offload', True).get('fixed', True)
+
+ def is_fixed_gso(self):
+ # in case of a missing configuration, rather return "fixed". In Ethtool
+ # terminology "fixed" means the setting can not be changed by the user.
+ return self.features.get('generic-segmentation-offload', True).get('fixed', True)
+
+ def is_fixed_sg(self):
+ # in case of a missing configuration, rather return "fixed". In Ethtool
+ # terminology "fixed" means the setting can not be changed by the user.
+ return self.features.get('scatter-gather', True).get('fixed', True)
+
+ def is_fixed_tso(self):
+ # in case of a missing configuration, rather return "fixed". In Ethtool
+ # terminology "fixed" means the setting can not be changed by the user.
+ return self.features.get('tcp-segmentation-offload', True).get('fixed', True)
+
+ def is_fixed_ufo(self):
+ # in case of a missing configuration, rather return "fixed". In Ethtool
+ # terminology "fixed" means the setting can not be changed by the user.
+ return self.features.get('udp-fragmentation-offload', True).get('fixed', True)
+
+ def get_rx_buffer(self):
+ # in case of a missing configuration rather return a "small"
+ # buffer of only 512 bytes.
+ return self.ring_buffers.get('rx', '512')
+
+ def get_tx_buffer(self):
+ # in case of a missing configuration rather return a "small"
+ # buffer of only 512 bytes.
+ return self.ring_buffers.get('tx', '512')
--
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