2. Ethernet Operation Guide

2.1. Operation Example

The Ethernet module is built into the kernel by default and does not require a separate load operation.

The steps for using the Ethernet port from the kernel are as follows:

  • Configure the IP address and subnet mask

    ifconfig eth0 xxx.xxx.xxx.xxx netmask xxx.xxx.xxx.xxx up

  • Set the default gateway

    route add default gw xxx.xxx.xxx.xxx

  • Verify network connectivity

    ping xxx.xxx.xxx.xxx
# ping Gatewayor  IP，ConfirmNetworkcan after after  NFS/TFTP Operation

  • Mount NFS

    mount -t nfs -o nolock xxx.xxx.xxx.xxx:/your/path /mount-dir

  • Use TFTP from the shell to upload and download files

    A TFTP service must be running on the server.

    Download a file:

    tftp -g -r [remote file name] [server ip]

    Note: remote file name is under ofFileName，server ipisunder File inserverofipAddress (Ex：tftp -g -r test.txt 192.168.0.11)。

    Upload a file:

    tftp -p -l [local file name] [server ip]

    Note: local file name is on ofFileName，server ipison Fileof serverofipAddress (Ex：tftp -p -l test.txt 192.168.0.11)。

Note: The CV184x Ethernet module does not support TSO.

Note: The NFS tool is not included in the file system by default and must be added when needed.

2.2. IPv6Description

SDK inDefaultDisableIPv6Function。If IPv6，Need toModifyKernelOption。 Operationas follows：

  1. CV184x

Modify

build/boards/cv184x/{board_name}/linux/cvitek_{board_name}_defconfig。

Ex: build/boards/cv184x/cv1842hp_wevb_0014a_spinor/linux/

cvitek_cv1842hp_wevb_0014a_spinor_defconfig AddorModify CONFIG_IPV6=y。 afterRebuildKernelSoftware。

IPv6 Configuration as follows：

  • ConfigurationipAddresswithandGateway

ip -6 addr add <ipv6 address>/ipv6 prefixlen dev <port name>

Ex: ip -6 addr add 2020:abc:102::8888/24 dev eth0

  • Ping ofIPv6Address

ping -6 <ipv6 address>

Ex: ping -6 2020:abc:102::6666

2.3. IEEE 802.3xFlow Control

2.3.1. Flow Control Description

CV184x EthernetSupportIEEE 802.3x DefinitionofFlow Control， Flow control withand ofFlow control method toFlow controlofPurpose。

  • Flow control ：

    in of of in，If before of can after of ， Flow control ， not ， 。

  • Flow control ：

    to ofFlow control ， ofFlow control Description ，etc.to Flow control after， 。IfinWait in to ofFlow control DescriptionofFlow control is0 ， 。

2.3.2. Flow Control Configuration

Flow control FunctionDefault Disableof， ProvideSoftwareInterfaceConfiguration。

Flow control FunctionofRelated FilesConfigurationinlinux/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

static int flow_ctrl = FLOW_OFF;
module_param(flow_ctrl, int, 0644);
MODULE_PARM_DESC(flow_ctrl, "Flow control ability [on/off]");
static int pause =PAUSE_TIME;
module_param(pause, int, 0644);
MODULE_PARM_DESC(pause, "Flow Control Pause Time");

If Default Flow Control，canModifyflow_ctrl = FLOW_AUTO。

If ModifyDefaultpause time，canConfiguration pause Value。

2.3.3. ethtoolConfigure Flow Control Through the Interface

UserCanThrough ethtoolToolsInterface Flow ControlofEnable。

ethtool -a eth0 CommandsVieweth0 Flow ControlStatus； as follows

# ethtool -a eth0
Pause parameters for eth0:
Autonegotiate: on
RX: off
TX: off

in，RXFlow control Disableof，TXFlow control Disableof；UserCanThroughfollowingCommandsEnableorDisableTXFlow control：

# ethtool -A eth0 tx off（DisableTXFlow control）
# ethtool -A eth0 tx on（EnableTXFlow control）

Note：ethtoolToolsDefaultnot FileSystem，Need toUserinNeed to 。