[dpdk-users] DPDK not working with ConnectX-3 card on Openstack virtual setup

[Greg O'Rawe <greg.orawe@owmobility.com>]

Hi,



I am trying to get DPDK 17.11.4 to run with a ConnectX-3 card on a virtual environment using Openstack.



This uses the VFIO driver which initialises correctly (though running in no-IOMMU mode). However starting DPDK via the testpmd binary fails trying to add default flows to the device.

mlx_fe-fe-0$ /root/testpmd -c 0xf -n 4 -w 0000:00:06.0 -w 0000:00:08.0  -- --rxq=2 --txq=2 -i
EAL: Detected 12 lcore(s)
EAL: No free hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using unreliable clock cycles !
EAL: PCI device 0000:00:06.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15b3:1004 net_mlx4
PMD: net_mlx4: PCI information matches, using device "mlx4_0" (VF: true)
PMD: net_mlx4: 1 port(s) detected
PMD: net_mlx4: port 1 MAC address is fa:16:3e:c6:5b:df
EAL: PCI device 0000:00:08.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15b3:1004 net_mlx4
PMD: net_mlx4: PCI information matches, using device "mlx4_2" (VF: true)
PMD: net_mlx4: 1 port(s) detected
PMD: net_mlx4: port 1 MAC address is fa:16:3e:d9:f9:9d
Interactive-mode selected
USER1: create a new mbuf pool <mbuf_pool_socket_0>: n=171456, size=2176, socket=0
Configuring Port 0 (socket 0)
PMD: net_mlx4: 0x55e3598ee200: cannot attach flow rules (code 12, "Cannot allocate memory"), flow error type 2, cause 0x13de8ee40, message: flow rule rejected by device
Fail to start port 0
Configuring Port 1 (socket 0)
PMD: net_mlx4: 0x55e3598f2280: cannot attach flow rules (code 12, "Cannot allocate memory"), flow error type 2, cause 0x13de8acc0, message: flow rule rejected by device
Fail to start port 1
Please stop the ports first
Done
testpmd>

/var/log/messages contains the following errors:

May  2 15:38:56 mlx_fe-fe-0 kernel: <mlx4_ib> __mlx4_ib_create_flow: mcg table is full. Fail to register network rule.
May  2 15:38:56 mlx_fe-fe-0 testpmd[27582]: PMD: net_mlx4: 0x55e3598ee200: cannot attach flow rules (code 12, "Cannot allocate memory"), flow error type 2, cause 0x13de8ee40, message: flow rule rejected by device
May  2 15:38:56 mlx_fe-fe-0 kernel: <mlx4_ib> __mlx4_ib_create_flow: mcg table is full. Fail to register network rule.
May  2 15:38:56 mlx_fe-fe-0 testpmd[27582]: PMD: net_mlx4: 0x55e3598f2280: cannot attach flow rules (code 12, "Cannot allocate memory"), flow error type 2, cause 0x13de8acc0, message: flow rule rejected by device

It seems that adding default flows fails due to the mcg table being full.
What could be the cause of this error? How is the mcg table configured?


Thanks
Greg O'Rawe

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