10. BNX2X Poll Mode Driver
The BNX2X poll mode driver library (librte_net_bnx2x) implements support for QLogic 578xx 10/20 Gbps family of adapters as well as their virtual functions (VF) in SR-IOV context. It is supported on several standard Linux distros like RHEL and SLES. It is compile-tested under FreeBSD OS.
More information can be found at QLogic Corporation’s Official Website.
10.1. Supported Features
BNX2X PMD has support for:
Base L2 features
Port hardware statistics
10.2. Non-supported Features
The features not yet supported include:
TSS (Transmit Side Scaling)
RSS (Receive Side Scaling)
Rx TX scatter gather
10.3. Co-existence considerations
QLogic 578xx CNAs support Ethernet, iSCSI and FCoE functionalities. These functionalities are supported using QLogic Linux kernel drivers bnx2x, cnic, bnx2i and bnx2fc. DPDK is supported on these adapters using bnx2x PMD.
When SR-IOV is not enabled on the adapter, QLogic Linux kernel drivers (bnx2x, cnic, bnx2i and bnx2fc) and bnx2x PMD can’t be attached to different PFs on a given QLogic 578xx adapter. A given adapter needs to be completely used by DPDK or Linux drivers. Before binding DPDK driver to one or more PFs on the adapter, please make sure to unbind Linux drivers from all PFs of the adapter. If there are multiple adapters on the system, one or more adapters can be used by DPDK driver completely and other adapters can be used by Linux drivers completely.
When SR-IOV is enabled on the adapter, Linux kernel drivers (bnx2x, cnic, bnx2i and bnx2fc) can be bound to the PFs of a given adapter and either bnx2x PMD or Linux drivers bnx2x can be bound to the VFs of the adapter.
10.4. Supported QLogic NICs
Requires firmware version 126.96.36.199. It is included in most of the standard Linux distros. If it is not available visit linux-firmware git repository to get the required firmware.
10.6. Pre-Installation Configuration
10.6.1. Config Options
The following options can be enabled with Meson flags. Please note that enabling debugging options may affect system performance.
Toggle display of transmit fast path run-time messages.
Toggle display of receive fast path run-time messages.
Toggle display of register reads and writes.
10.7. Driver compilation and testing
Refer to the document compiling and testing a PMD for a NIC for details.
10.8. Jumbo: Limitation
Rx descriptor limit for number of segments per MTU is set to 1. PMD doesn’t support Jumbo Rx scatter gather. Some applciations can adjust mbuf_size based on this param and max_pkt_len.
For others, PMD detects the condition where Rx packet length cannot be held by configured mbuf size and logs the message.
[...] [bnx2x_recv_pkts:397(04:00.0:dpdk-port-0)] mbuf size 2048 is not enough to hold Rx packet length more than 2046
10.9. SR-IOV: Prerequisites and sample Application Notes
This section provides instructions to configure SR-IOV with Linux OS.
Verify SR-IOV and ARI capabilities are enabled on the adapter using
lspci -s <slot> -vvv
[...] Capabilities: [1b8 v1] Alternative Routing-ID Interpretation (ARI) [...] Capabilities: [1c0 v1] Single Root I/O Virtualization (SR-IOV) [...] Kernel driver in use: igb_uio
Load the kernel module:
systemd-udevd: renamed network interface eth0 to ens5f0 systemd-udevd: renamed network interface eth1 to ens5f1
Bring up the PF ports:
ifconfig ens5f0 up ifconfig ens5f1 up
Create VF device(s):
Echo the number of VFs to be created into “sriov_numvfs” sysfs entry of the parent PF.
echo 2 > /sys/devices/pci0000:00/0000:00:03.0/0000:81:00.0/sriov_numvfs
Assign VF MAC address:
Assign MAC address to the VF using iproute2 utility. The syntax is: ip link set <PF iface> vf <VF id> mac <macaddr>
ip link set ens5f0 vf 0 mac 52:54:00:2f:9d:e8
The VF devices may be passed through to the guest VM using virt-manager or virsh etc. bnx2x PMD should be used to bind the VF devices in the guest VM using the instructions outlined in the Application notes below.
Running testpmd: (Supply
--log-level="pmd.net.bnx2x.driver",7to view informational messages):
Follow instructions available in the document compiling and testing a PMD for a NIC to run testpmd.
[...] EAL: PCI device 0000:84:00.0 on NUMA socket 1 EAL: probe driver: 14e4:168e rte_bnx2x_pmd EAL: PCI memory mapped at 0x7f14f6fe5000 EAL: PCI memory mapped at 0x7f14f67e5000 EAL: PCI memory mapped at 0x7f15fbd9b000 EAL: PCI device 0000:84:00.1 on NUMA socket 1 EAL: probe driver: 14e4:168e rte_bnx2x_pmd EAL: PCI memory mapped at 0x7f14f5fe5000 EAL: PCI memory mapped at 0x7f14f57e5000 EAL: PCI memory mapped at 0x7f15fbd4f000 Interactive-mode selected Configuring Port 0 (socket 0) PMD: bnx2x_dev_tx_queue_setup(): fp req_bd=512, thresh=512, usable_bd=1020, total_bd=1024, tx_pages=4 PMD: bnx2x_dev_rx_queue_setup(): fp req_bd=128, thresh=0, usable_bd=510, total_bd=512, rx_pages=1, cq_pages=8 PMD: bnx2x_print_adapter_info(): [...] Checking link statuses... Port 0 Link Up - speed 10000 Mbps - full-duplex Port 1 Link Up - speed 10000 Mbps - full-duplex Done testpmd>