add kfuncs docs (#136)

* add

* update

* update

* add ci

* update

* fix

.github/workflows/main.yml

@@ -14,7 +14,9 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v3.3.0
+      - uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable

.github/workflows/test-libbpf.yml

@@ -68,4 +68,16 @@ jobs:
     - name: test 35-user-ringbuf
       run: |
         make -C src/35-user-ringbuf
-        sudo timeout -s 2 3 src/35-user-ringbuf/user_ringbuf || if [ $? = 124 ]; then exit 0; else exit $?; fi
+        sudo timeout -s 2 3 src/35-user-ringbuf/user_ringbuf || if [ $? = 124 ]; then exit 0; else exit $?; fi
+
+    - name: test 41 xdp
+      run: |
+          make -C src/41-xdp-tcpdump
+
+    - name: test 42 xdp
+      run: |
+          make -C src/42-xdp-loadbalancer
+
+    - name: test 43 kfuncs
+      run: |
+          make -C src/43-kfuncs