There is a bug in ixgbe relating to creating and deleting flow director rules.
Enable flow director and create two simple rules in locations 1 and 2 like this:
sudo ethtool -K eth0 ntuple on
sudo ethtool -U eth0 flow-type udp4 src-port 5000 action 1 loc 1
sudo ethtool -U eth0 flow-type udp4 src-port 5001 action 2 loc 2
You now cannot delete rule 1:
sudo ethtool -U eth0 delete 1
rmgr: Cannot delete RX class rule: Invalid argument
Cannot delete classification rule
You cannot even view rule 1:
ethtool -u eth0
8 RX rings available
Total 2 rules
Filter: 2
Rule Type: UDP over IPv4
Src IP addr: 0.0.0.0 mask: 255.255.255.255
Dest IP addr: 0.0.0.0 mask: 255.255.255.255
TOS: 0x0 mask: 0xff
Src port: 5001 mask: 0x0
Dest port: 0 mask: 0xffff
VLAN EtherType: 0x0 mask: 0xffff
VLAN: 0x0 mask: 0xffff
User-defined: 0x0 mask: 0xffffffffffffffff
Action: Direct to queue 2
rxclass: Cannot get RX class rule: Invalid argument
RX classification rule retrieval failed
But if you delete rule 2, rule 1 becomes visible again:
sudo ethtool -U eth0 delete 2
ethtool -u eth0
8 RX rings available
Total 1 rules
Filter: 1
Rule Type: UDP over IPv4
Src IP addr: 0.0.0.0 mask: 255.255.255.255
Dest IP addr: 0.0.0.0 mask: 255.255.255.255
TOS: 0x0 mask: 0xff
Src port: 5000 mask: 0x0
Dest port: 0 mask: 0xffff
VLAN EtherType: 0x0 mask: 0xffff
VLAN: 0x0 mask: 0xffff
User-defined: 0x0 mask: 0xffffffffffffffff
Action: Direct to queue 1
The bug appears to be in ixgbe_update_ethtool_fdir_entry(). A different version
of this function in version 3.15.1-k (supplied with Ubuntu 14.04) works
correctly.
Regards,
Stuart.
Stuart Grace
Project Technologist
BBC Research & Development
R&D North Lab, 5th Floor
Dock House, MediaCityUK, Salford, M50 2LH, UK
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