dpdk-debug

1. download dpdk source and build it

ref: https://core.dpdk.org/doc/quick-start/
meson --buildtype=debug debugbuild

2. Reserve huge pages memory.

mkdir -p /dev/hugepages
mountpoint -q /dev/hugepages || mount -t hugetlbfs nodev /dev/hugepages
echo 64 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

3. construct Sample Topology

This tutorial uses the following topology to carry out the tests.

+                                                       +
|                                                       |
|                       +-----+                         |
|                       |     |                         |
|                       |     |                         |
|     +----------+      | DPDK|     +----------+        |
|     |   left   |      | App |     |  right   |        |
|     | namespace|      |     |     |namespace |        |
+-----+        A +------+     +-----+ B        +--------+
|     |          |    A'|     | B'  |          |        |
|     |          |      |     |     |          |        |
|     +----------+      |     |     +----------+        |
|                       |     |                         |
|                       |     |                         |
|                       |     |                         |
|                       +-----+                         |
|                                                       |
|                                                       |
+                                                       +

192.168.0.X n/w 10.0.0.X n/w

A = veth_l1
A' = veth_l0
B = veth_r1
B' = veth_r0

Diagram: Sample Topology for conntrack testing
The steps for creation of the setup are mentioned below.

Create “left” network namespace:

$ ip netns add left
Create “right” network namespace:

$ ip netns add right
Create first pair of veth interfaces:

$ ip link add veth_l0 type veth peer name veth_l1
Add veth_l1 to “left” network namespace:

$ ip link set veth_l1 netns left
Create second pair of veth interfaces:

$ ip link add veth_r0 type veth peer name veth_r1
Add veth_r1 to “right” network namespace:

$ ip link set veth_r1 netns right

4. start test dpdk-app:

./debugbuild/app/dpdk-testpmd -c7 --vdev=net_pcap0,iface=veth_l0 --vdev=net_pcap1,iface=veth_r0 -- -i --nb-cores=2 --nb-ports=2 --total-num-mbufs=2048

testpmd> set verbose 1
testpmd> start

left ns:

ip netns exec left ping 192.168.0.6 -c1

right ns:

ip netns exec right tcpdump -i veth_r1 -nn
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on veth_r1, link-type EN10MB (Ethernet), capture size 262144 bytes
15:49:09.967117 ARP, Request who-has 192.168.0.6 tell 192.168.0.2, length 28
15:49:09.967137 ARP, Reply 192.168.0.6 is-at ca:24:08:0c:52:ca, length 28
 
16:07:16.624179 IP 192.168.0.2 > 192.168.0.6: ICMP echo request, id 30308, seq 1, length 64
16:07:16.624217 IP 192.168.0.6 > 192.168.0.2: ICMP echo reply, id 30308, seq 1, length 64

5. vscode setting

remote-ssh setting:

# Read more about SSH config files: https://linux.die.net/man/5/ssh_config
Host linux
    HostName  100.85.244.203
    User root
    IdentityFile "C:\Users\{replace-username}\.ssh\id_rsa"

NOTE: run ssh-copy-id root@100.85.244.203 to set no-pass login.

launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(gdb) Attach",
            "type": "cppdbg",
            "request": "attach",
            "program": "${workspaceFolder}/debugbuild/app/dpdk-testpmd",
            "cwd": "${workspaceFolder}",
            "processId": "19083",
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ],
            "miDebuggerPath": "/usr/bin/gdb",
        }
    ]
}

install Dependency

yum install zlib-devel
pip3 install meson
pip3 install pyelftools