ci(workflows/bpf-test): add BPF test to cover route logic

.github/workflows/bpf-test.yml

@@ -0,0 +1,28 @@
+name: BPF Test
+
+on:
+  pull_request:
+    paths:
+      - "**/*.c"
+      - "**/*.h"
+      - "go.mod"
+      - "go.sum"
+      - ".github/workflows/bpf-test.yml"
+
+permissions: read-all
+
+jobs:
+  bpf_tests:
+    name: BPF Unit Test
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+        with:
+          persist-credentials: false
+          fetch-depth: 0
+      - name: Run BPF tests
+        run: |
+          git submodule update --init
+          sudo make ebpf-test || (echo "Run 'make ebpf-test' locally to investigate failures"; exit 1)
+

Makefile

@@ -79,6 +79,8 @@ clean-ebpf:
 		rm -f control/bpf_bpf*.o
 	@rm -f trace/bpf_bpf*.go && \
 		rm -f trace/bpf_bpf*.o
+	@rm -f control/kern/tests/bpftest_bpf*.go && \
+		rm -f control/kern/tests/bpftest_bpf*.o
 fmt:
 	go fmt ./...
 
@@ -99,4 +101,18 @@ ebpf: submodule clean-ebpf
 ebpf-lint:
 	./scripts/checkpatch.pl --no-tree --strict --no-summary --show-types --color=always control/kern/tproxy.c --ignore COMMIT_COMMENT_SYMBOL,NOT_UNIFIED_DIFF,COMMIT_LOG_LONG_LINE,LONG_LINE_COMMENT,VOLATILE,ASSIGN_IN_IF,PREFER_DEFINED_ATTRIBUTE_MACRO,CAMELCASE,LEADING_SPACE,OPEN_ENDED_LINE,SPACING,BLOCK_COMMENT_STYLE
 
+ebpf-test: export BPF_CLANG := $(CLANG)
+ebpf-test: export BPF_STRIP_FLAG := $(STRIP_FLAG)
+ebpf-test: export BPF_CFLAGS := $(CFLAGS)
+ebpf-test: export BPF_TARGET := $(TARGET)
+ebpf-test: export BPF_TRACE_TARGET := $(GOARCH)
+ebpf-test: submodule clean-ebpf
+	@unset GOOS && \
+    unset GOARCH && \
+    unset GOARM && \
+    echo $(STRIP_FLAG) && \
+    go generate ./control/kern/tests/bpf_test.go && \
+    go clean -testcache && \
+    go test -v ./control/kern/tests/...
+
 ## End Ebpf