ethernet: T3163: probe driver for maximum rx/tx ring-buffer size

(cherry picked from commit cf1156a60e1d03a752cde0baadbc9ac8118b2a52)

1 files changed, 16 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces-ethernet.py b/src/conf_mode/interfaces-ethernet.py
index e7f0cd6a5..e92c16eb6 100755
--- a/src/conf_mode/interfaces-ethernet.py
+++ b/src/conf_mode/interfaces-ethernet.py
@@ -30,6 +30,7 @@ from vyos.configverify import verify_mtu
 from vyos.configverify import verify_mtu_ipv6
 from vyos.configverify import verify_vlan_config
 from vyos.configverify import verify_vrf
+from vyos.ethtool import Ethtool
 from vyos.ifconfig import EthernetIf
 from vyos.template import render
 from vyos.util import call
@@ -80,6 +81,21 @@ def verify(ethernet):
         if not os.path.exists(f'/sys/class/net/{ifname}/queues/rx-0/rps_cpus'):
             raise ConfigError('Interface does not suport RPS!')
 
+    ethtool = Ethtool(ifname)
+    if 'ring_buffer' in ethernet:
+        max_rx = ethtool.get_rx_buffer()
+        max_tx = ethtool.get_tx_buffer()
+
+        rx = dict_search('ring_buffer.rx', ethernet)
+        if rx and int(rx) > int(max_rx):
+            raise ConfigError(f'Driver only supports a maximum RX ring-buffer '\
+                              f'size of "{max_rx}" bytes!')
+
+        tx = dict_search('ring_buffer.tx', ethernet)
+        if tx and int(tx) > int(max_tx):
+            raise ConfigError(f'Driver only supports a maximum TX ring-buffer '\
+                              f'size of "{max_tx}" bytes!')
+
     # XDP requires multiple TX queues
     if 'xdp' in ethernet:
         queues = glob(f'/sys/class/net/{ifname}/queues/tx-*')