12. CXGBE Poll Mode Driver

The CXGBE PMD (librte_net_cxgbe) provides poll mode driver support for Chelsio Terminator 10/25/40/100 Gbps family of adapters. CXGBE PMD has support for the latest Linux and FreeBSD operating systems.

CXGBEVF PMD provides poll mode driver support for SR-IOV Virtual functions and has support for the latest Linux operating systems.

More information can be found at Chelsio Communications Official Website.

12.1. Features

CXGBE and CXGBEVF PMD has support for:

  • Multiple queues for TX and RX

  • Receiver Side Steering (RSS) Receiver Side Steering (RSS) on IPv4, IPv6, IPv4-TCP/UDP, IPv6-TCP/UDP. For 4-tuple, enabling ‘RSS on TCP’ and ‘RSS on TCP + UDP’ is supported.

  • VLAN filtering

  • Checksum offload

  • Promiscuous mode

  • All multicast mode

  • Port hardware statistics

  • Jumbo frames

  • Flow API - Support for both Wildcard (LE-TCAM) and Exact (HASH) match filters.

12.2. Limitations

The Chelsio Terminator series of devices provide two/four ports but expose a single PCI bus address, thus, librte_net_cxgbe registers itself as a PCI driver that allocates one Ethernet device per detected port.

For this reason, one cannot allow/block a single port without allowing/blocking the other ports on the same device.

12.3. Supported Chelsio T5 NICs

  • 1G NICs: T502-BT

  • 10G NICs: T520-BT, T520-CR, T520-LL-CR, T520-SO-CR, T540-CR

  • 40G NICs: T580-CR, T580-LP-CR, T580-SO-CR

  • Other T5 NICs: T522-CR

12.4. Supported Chelsio T6 NICs

  • 25G NICs: T6425-CR, T6225-CR, T6225-LL-CR, T6225-SO-CR

  • 100G NICs: T62100-CR, T62100-LP-CR, T62100-SO-CR

12.5. Supported SR-IOV Chelsio NICs

SR-IOV virtual functions are supported on all the Chelsio NICs listed in Supported Chelsio T5 NICs and Supported Chelsio T6 NICs.

12.6. Prerequisites

  • Requires firmware version 1.24.11.0 and higher. Visit Chelsio Download Center to get latest firmware bundled with the latest Chelsio Unified Wire package.

    For Linux, installing and loading the latest cxgb4 kernel driver from the Chelsio Unified Wire package should get you the latest firmware. More information can be obtained from the User Guide that is bundled with the Chelsio Unified Wire package.

    For FreeBSD, the latest firmware obtained from the Chelsio Unified Wire package must be manually flashed via cxgbetool available in FreeBSD source repository.

    Instructions on how to manually flash the firmware are given in section Linux Installation for Linux and section FreeBSD Installation for FreeBSD.

12.7. Runtime Options

The following devargs options can be enabled at runtime. They must be passed as part of EAL arguments. For example,

dpdk-testpmd -a 02:00.4,keep_ovlan=1 -- -i

12.7.1. Common Runtime Options

  • keep_ovlan (default 0)

    Toggle behavior to keep/strip outer VLAN in Q-in-Q packets. If enabled, the outer VLAN tag is preserved in Q-in-Q packets. Otherwise, the outer VLAN tag is stripped in Q-in-Q packets.

  • tx_mode_latency (default 0)

    When set to 1, Tx doesn’t wait for max number of packets to get coalesced and sends the packets immediately at the end of the current Tx burst. When set to 0, Tx waits across multiple Tx bursts until the max number of packets have been coalesced. In this case, Tx only sends the coalesced packets to hardware once the max coalesce limit has been reached.

12.7.2. CXGBE VF Only Runtime Options

  • force_link_up (default 0)

    When set to 1, CXGBEVF PMD always forces link as up for all VFs on underlying Chelsio NICs. This enables multiple VFs on the same NIC to send traffic to each other even when the physical link is down.

12.7.3. CXGBE PF Only Runtime Options

  • filtermode (default 0)

    Apart from the 4-tuple (IP src/dst addresses and TCP/UDP src/dst port addresses), there are only 40-bits available to match other fields in packet headers. So, filtermode devarg allows user to dynamically select a 40-bit supported match field combination for LETCAM (wildcard) filters.

    Default value of 0 makes driver pick the combination configured in the firmware configuration file on the adapter.

    The supported flags and their corresponding values are shown in table below. These flags can be OR’d to create 1 of the multiple supported combinations for LETCAM filters.

    FLAG

    VALUE

    Physical Port

    0x1

    PFVF

    0x2

    Destination MAC

    0x4

    Ethertype

    0x8

    Inner VLAN

    0x10

    Outer VLAN

    0x20

    IP TOS

    0x40

    IP Protocol

    0x80

    The supported filtermode combinations and their corresponding OR’d values are shown in table below.

    FILTERMODE COMBINATIONS

    VALUE

    Protocol, TOS, Outer VLAN, Port

    0xE1

    Protocol, TOS, Outer VLAN

    0xE0

    Protocol, TOS, Inner VLAN, Port

    0xD1

    Protocol, TOS, Inner VLAN

    0xD0

    Protocol, TOS, PFVF, Port

    0xC3

    Protocol, TOS, PFVF

    0xC2

    Protocol, TOS, Port

    0xC1

    Protocol, TOS

    0xC0

    Protocol, Outer VLAN, Port

    0xA1

    Protocol, Outer VLAN

    0xA0

    Protocol, Inner VLAN, Port

    0x91

    Protocol, Inner VLAN

    0x90

    Protocol, Ethertype, DstMAC, Port

    0x8D

    Protocol, Ethertype, DstMAC

    0x8C

    Protocol, Ethertype, Port

    0x89

    Protocol, Ethertype

    0x88

    Protocol, DstMAC, PFVF, Port

    0x87

    Protocol, DstMAC, PFVF

    0x86

    Protocol, DstMAC, Port

    0x85

    Protocol, DstMAC

    0x84

    Protocol, PFVF, Port

    0x83

    Protocol, PFVF

    0x82

    Protocol, Port

    0x81

    Protocol

    0x80

    TOS, Outer VLAN, Port

    0x61

    TOS, Outer VLAN

    0x60

    TOS, Inner VLAN, Port

    0x51

    TOS, Inner VLAN

    0x50

    TOS, Ethertype, DstMAC, Port

    0x4D

    TOS, Ethertype, DstMAC

    0x4C

    TOS, Ethertype, Port

    0x49

    TOS, Ethertype

    0x48

    TOS, DstMAC, PFVF, Port

    0x47

    TOS, DstMAC, PFVF

    0x46

    TOS, DstMAC, Port

    0x45

    TOS, DstMAC

    0x44

    TOS, PFVF, Port

    0x43

    TOS, PFVF

    0x42

    TOS, Port

    0x41

    TOS

    0x40

    Outer VLAN, Inner VLAN, Port

    0x31

    Outer VLAN, Ethertype, Port

    0x29

    Outer VLAN, Ethertype

    0x28

    Outer VLAN, DstMAC, Port

    0x25

    Outer VLAN, DstMAC

    0x24

    Outer VLAN, Port

    0x21

    Outer VLAN

    0x20

    Inner VLAN, Ethertype, Port

    0x19

    Inner VLAN, Ethertype

    0x18

    Inner VLAN, DstMAC, Port

    0x15

    Inner VLAN, DstMAC

    0x14

    Inner VLAN, Port

    0x11

    Inner VLAN

    0x10

    Ethertype, DstMAC, Port

    0xD

    Ethertype, DstMAC

    0xC

    Ethertype, PFVF, Port

    0xB

    Ethertype, PFVF

    0xA

    Ethertype, Port

    0x9

    Ethertype

    0x8

    DstMAC, PFVF, Port

    0x7

    DstMAC, PFVF

    0x6

    DstMAC, Port

    0x5

    Destination MAC

    0x4

    PFVF, Port

    0x3

    PFVF

    0x2

    Physical Port

    0x1

    For example, to enable matching ethertype field in Ethernet header, and protocol field in IPv4 header, the filtermode combination must be given as:

    dpdk-testpmd -a 02:00.4,filtermode=0x88 -- -i
    
  • filtermask (default 0)

    filtermask devarg works similar to filtermode, but is used to configure a filter mode combination for HASH (exact-match) filters.

    Note

    The combination chosen for filtermask devarg must be a subset of the combination chosen for filtermode devarg.

    Default value of 0 makes driver pick the combination configured in the firmware configuration file on the adapter.

    Note that the filter rule will only be inserted in HASH region, if the rule contains all the fields specified in the filtermask combination. Otherwise, the filter rule will get inserted in LETCAM region.

    The same combination list explained in the tables in filtermode devarg section earlier applies for filtermask devarg, as well.

    For example, to enable matching only protocol field in IPv4 header, the filtermask combination must be given as:

    dpdk-testpmd -a 02:00.4,filtermode=0x88,filtermask=0x80 -- -i
    

12.8. Driver compilation and testing

Refer to the document compiling and testing a PMD for a NIC for details.

12.9. Linux

12.9.1. Linux Installation

Steps to manually install the latest firmware from the downloaded Chelsio Unified Wire package for Linux operating system are as follows:

  1. Load the kernel module:

    modprobe cxgb4
    
  2. Use ifconfig to get the interface name assigned to Chelsio card:

    ifconfig -a | grep "00:07:43"
    

    Example output:

    p1p1      Link encap:Ethernet  HWaddr 00:07:43:2D:EA:C0
    p1p2      Link encap:Ethernet  HWaddr 00:07:43:2D:EA:C8
    
  3. Install cxgbtool:

    cd <path_to_uwire>/tools/cxgbtool
    make install
    
  4. Use cxgbtool to load the firmware config file onto the card:

    cxgbtool p1p1 loadcfg <path_to_uwire>/src/network/firmware/t5-config.txt
    
  5. Use cxgbtool to load the firmware image onto the card:

    cxgbtool p1p1 loadfw <path_to_uwire>/src/network/firmware/t5fw-*.bin
    
  6. Unload and reload the kernel module:

    modprobe -r cxgb4
    modprobe cxgb4
    
  7. Verify with ethtool:

    ethtool -i p1p1 | grep "firmware"
    

    Example output:

    firmware-version: 1.24.11.0, TP 0.1.23.2
    

12.9.2. Running testpmd

This section demonstrates how to launch testpmd with Chelsio devices managed by librte_net_cxgbe in Linux operating system.

  1. Load the kernel module:

    modprobe cxgb4
    
  2. Get the PCI bus addresses of the interfaces bound to cxgb4 driver:

    dmesg | tail -2
    

    Example output:

    cxgb4 0000:02:00.4 p1p1: renamed from eth0
    cxgb4 0000:02:00.4 p1p2: renamed from eth1
    

    Note

    Both the interfaces of a Chelsio 2-port adapter are bound to the same PCI bus address.

  3. Unload the kernel module:

    modprobe -ar cxgb4 csiostor
    
  4. Running testpmd

    Follow instructions available in the document compiling and testing a PMD for a NIC to run testpmd.

    Note

    Currently, CXGBE PMD only supports the binding of PF4 for Chelsio NICs.

    Example output:

    [...]
    EAL: PCI device 0000:02:00.4 on NUMA socket -1
    EAL:   probe driver: 1425:5401 rte_cxgbe_pmd
    EAL:   PCI memory mapped at 0x7fd7c0200000
    EAL:   PCI memory mapped at 0x7fd77cdfd000
    EAL:   PCI memory mapped at 0x7fd7c10b7000
    PMD: rte_cxgbe_pmd: fw: 1.24.11.0, TP: 0.1.23.2
    PMD: rte_cxgbe_pmd: Coming up as MASTER: Initializing adapter
    Interactive-mode selected
    Configuring Port 0 (socket 0)
    Port 0: 00:07:43:2D:EA:C0
    Configuring Port 1 (socket 0)
    Port 1: 00:07:43:2D:EA:C8
    Checking link statuses...
    PMD: rte_cxgbe_pmd: Port0: passive DA port module inserted
    PMD: rte_cxgbe_pmd: Port1: passive DA port module inserted
    Port 0 Link Up - speed 10000 Mbps - full-duplex
    Port 1 Link Up - speed 10000 Mbps - full-duplex
    Done
    testpmd>
    

    Note

    Flow control pause TX/RX is disabled by default and can be enabled via testpmd. Refer section Enable/Disable Flow Control for more details.

12.9.3. Configuring SR-IOV Virtual Functions

This section demonstrates how to enable SR-IOV virtual functions on Chelsio NICs and demonstrates how to run testpmd with SR-IOV virtual functions.

  1. Load the kernel module:

    modprobe cxgb4
    
  2. Get the PCI bus addresses of the interfaces bound to cxgb4 driver:

    dmesg | tail -2
    

    Example output:

    cxgb4 0000:02:00.4 p1p1: renamed from eth0
    cxgb4 0000:02:00.4 p1p2: renamed from eth1
    

    Note

    Both the interfaces of a Chelsio 2-port adapter are bound to the same PCI bus address.

  3. Use ifconfig to get the interface name assigned to Chelsio card:

    ifconfig -a | grep "00:07:43"
    

    Example output:

    p1p1      Link encap:Ethernet  HWaddr 00:07:43:2D:EA:C0
    p1p2      Link encap:Ethernet  HWaddr 00:07:43:2D:EA:C8
    
  4. Bring up the interfaces:

    ifconfig p1p1 up
    ifconfig p1p2 up
    
  5. Instantiate SR-IOV Virtual Functions. PF0..3 can be used for SR-IOV VFs. Multiple VFs can be instantiated on each of PF0..3. To instantiate one SR-IOV VF on each PF0 and PF1:

    echo 1 > /sys/bus/pci/devices/0000\:02\:00.0/sriov_numvfs
    echo 1 > /sys/bus/pci/devices/0000\:02\:00.1/sriov_numvfs
    
  6. Get the PCI bus addresses of the virtual functions:

    lspci | grep -i "Chelsio" | grep -i "VF"
    

    Example output:

    02:01.0 Ethernet controller: Chelsio Communications Inc T540-CR Unified Wire Ethernet Controller [VF]
    02:01.1 Ethernet controller: Chelsio Communications Inc T540-CR Unified Wire Ethernet Controller [VF]
    
  7. Running testpmd

    Follow instructions available in the document compiling and testing a PMD for a NIC to bind virtual functions and run testpmd.

    Example output:

    [...]
    EAL: PCI device 0000:02:01.0 on NUMA socket 0
    EAL:   probe driver: 1425:5803 net_cxgbevf
    PMD: rte_cxgbe_pmd: Firmware version: 1.24.11.0
    PMD: rte_cxgbe_pmd: TP Microcode version: 0.1.23.2
    PMD: rte_cxgbe_pmd: Chelsio rev 0
    PMD: rte_cxgbe_pmd: No bootstrap loaded
    PMD: rte_cxgbe_pmd: No Expansion ROM loaded
    PMD: rte_cxgbe_pmd:  0000:02:01.0 Chelsio rev 0 1G/10GBASE-SFP
    EAL: PCI device 0000:02:01.1 on NUMA socket 0
    EAL:   probe driver: 1425:5803 net_cxgbevf
    PMD: rte_cxgbe_pmd: Firmware version: 1.24.11.0
    PMD: rte_cxgbe_pmd: TP Microcode version: 0.1.23.2
    PMD: rte_cxgbe_pmd: Chelsio rev 0
    PMD: rte_cxgbe_pmd: No bootstrap loaded
    PMD: rte_cxgbe_pmd: No Expansion ROM loaded
    PMD: rte_cxgbe_pmd:  0000:02:01.1 Chelsio rev 0 1G/10GBASE-SFP
    Configuring Port 0 (socket 0)
    Port 0: 06:44:29:44:40:00
    Configuring Port 1 (socket 0)
    Port 1: 06:44:29:44:40:10
    Checking link statuses...
    Done
    testpmd>
    

12.10. FreeBSD

12.10.1. FreeBSD Installation

Steps to manually install the latest firmware from the downloaded Chelsio Unified Wire package for FreeBSD operating system are as follows:

  1. Load the kernel module:

    kldload if_cxgbe
    
  2. Use dmesg to get the t5nex instance assigned to the Chelsio card:

    dmesg | grep "t5nex"
    

    Example output:

    t5nex0: <Chelsio T520-CR> irq 16 at device 0.4 on pci2
    cxl0: <port 0> on t5nex0
    cxl1: <port 1> on t5nex0
    t5nex0: PCIe x8, 2 ports, 14 MSI-X interrupts, 31 eq, 13 iq
    

    In the example above, a Chelsio T520-CR card is bound to a t5nex0 instance.

  3. Install cxgbetool from FreeBSD source repository:

    cd <path_to_FreeBSD_source>/tools/tools/cxgbetool/
    make && make install
    
  4. Use cxgbetool to load the firmware image onto the card:

    cxgbetool t5nex0 loadfw <path_to_uwire>/src/network/firmware/t5fw-*.bin
    
  5. Unload and reload the kernel module:

    kldunload if_cxgbe
    kldload if_cxgbe
    
  6. Verify with sysctl:

    sysctl -a | grep "t5nex" | grep "firmware"
    

    Example output:

    dev.t5nex.0.firmware_version: 1.24.11.0
    

12.10.2. Running testpmd

This section demonstrates how to launch testpmd with Chelsio devices managed by librte_net_cxgbe in FreeBSD operating system.

  1. Change to DPDK source directory where the target has been compiled in section Driver compilation and testing:

    cd <DPDK-source-directory>
    
  2. Copy the contigmem kernel module to /boot/kernel directory:

    cp <build_dir>/kernel/freebsd/contigmem.ko /boot/kernel/
    
  3. Add the following lines to /boot/loader.conf:

    # reserve 2 x 1G blocks of contiguous memory using contigmem driver
    hw.contigmem.num_buffers=2
    hw.contigmem.buffer_size=1073741824
    # load contigmem module during boot process
    contigmem_load="YES"
    

    The above lines load the contigmem kernel module during boot process and allocate 2 x 1G blocks of contiguous memory to be used for DPDK later on. This is to avoid issues with potential memory fragmentation during later system up time, which may result in failure of allocating the contiguous memory required for the contigmem kernel module.

  4. Restart the system and ensure the contigmem module is loaded successfully:

    reboot
    kldstat | grep "contigmem"
    

    Example output:

    2    1 0xffffffff817f1000 3118     contigmem.ko
    
  5. Repeat step 1 to ensure that you are in the DPDK source directory.

  6. Load the cxgbe kernel module:

    kldload if_cxgbe
    
  7. Get the PCI bus addresses of the interfaces bound to t5nex driver:

    pciconf -l | grep "t5nex"
    

    Example output:

    t5nex0@pci0:2:0:4: class=0x020000 card=0x00001425 chip=0x54011425 rev=0x00
    

    In the above example, the t5nex0 is bound to 2:0:4 bus address.

    Note

    Both the interfaces of a Chelsio 2-port adapter are bound to the same PCI bus address.

  8. Unload the kernel module:

    kldunload if_cxgbe
    
  9. Set the PCI bus addresses to hw.nic_uio.bdfs kernel environment parameter:

    kenv hw.nic_uio.bdfs="2:0:4"
    

    This automatically binds 2:0:4 to nic_uio kernel driver when it is loaded in the next step.

    Note

    Currently, CXGBE PMD only supports the binding of PF4 for Chelsio NICs.

  10. Load nic_uio kernel driver:

    kldload <build_dir>/kernel/freebsd/nic_uio.ko
    
  11. Start testpmd with basic parameters:

    ./<build_dir>/app/dpdk-testpmd -l 0-3 -n 4 -a 0000:02:00.4 -- -i
    

    Example output:

    [...]
    EAL: PCI device 0000:02:00.4 on NUMA socket 0
    EAL:   probe driver: 1425:5401 rte_cxgbe_pmd
    EAL:   PCI memory mapped at 0x8007ec000
    EAL:   PCI memory mapped at 0x842800000
    EAL:   PCI memory mapped at 0x80086c000
    PMD: rte_cxgbe_pmd: fw: 1.24.11.0, TP: 0.1.23.2
    PMD: rte_cxgbe_pmd: Coming up as MASTER: Initializing adapter
    Interactive-mode selected
    Configuring Port 0 (socket 0)
    Port 0: 00:07:43:2D:EA:C0
    Configuring Port 1 (socket 0)
    Port 1: 00:07:43:2D:EA:C8
    Checking link statuses...
    PMD: rte_cxgbe_pmd: Port0: passive DA port module inserted
    PMD: rte_cxgbe_pmd: Port1: passive DA port module inserted
    Port 0 Link Up - speed 10000 Mbps - full-duplex
    Port 1 Link Up - speed 10000 Mbps - full-duplex
    Done
    testpmd>
    

Note

Flow control pause TX/RX is disabled by default and can be enabled via testpmd. Refer section Enable/Disable Flow Control for more details.

12.11. Sample Application Notes

12.11.1. Enable/Disable Flow Control

Flow control pause TX/RX is disabled by default and can be enabled via testpmd as follows:

testpmd> set flow_ctrl rx on tx on 0 0 0 0 mac_ctrl_frame_fwd off autoneg on 0
testpmd> set flow_ctrl rx on tx on 0 0 0 0 mac_ctrl_frame_fwd off autoneg on 1

To disable again, run:

testpmd> set flow_ctrl rx off tx off 0 0 0 0 mac_ctrl_frame_fwd off autoneg off 0
testpmd> set flow_ctrl rx off tx off 0 0 0 0 mac_ctrl_frame_fwd off autoneg off 1

12.11.2. Jumbo Mode

There are two ways to enable sending and receiving of jumbo frames via testpmd. One method involves using the mtu command, which changes the mtu of an individual port without having to stop the selected port. Another method involves stopping all the ports first and then running max-pkt-len command to configure the mtu of all the ports with a single command.

  • To configure each port individually, run the mtu command as follows:

    testpmd> port config mtu 0 9000
    testpmd> port config mtu 1 9000
    
  • To configure all the ports at once, stop all the ports first and run the max-pkt-len command as follows:

    testpmd> port stop all
    testpmd> port config all max-pkt-len 9000