selftests/bpf: Integrate test_xsk.c to test_progs framework

.github/actions/veristat_baseline_compare/action.yml

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+name: 'run-veristat'
+description: 'Run veristat benchmark'
+inputs:
+  veristat_output:
+    description: 'Veristat output filepath'
+    required: true
+  baseline_name:
+    description: 'Veristat baseline cache name'
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/upload-artifact@v4
+      with:
+        name: ${{ inputs.baseline_name }}
+        if-no-files-found: error
+        path: ${{ github.workspace }}/${{ inputs.veristat_output }}
+
+    # For pull request:
+    # - get baseline log from cache
+    # - compare it to current run
+    - if: ${{ github.event_name == 'pull_request' }}
+      uses: actions/cache/restore@v4
+      with:
+        key: ${{ github.base_ref }}-${{ inputs.baseline_name }}-
+        restore-keys: |
+          ${{ github.base_ref }}-${{ inputs.baseline_name }}
+        path: '${{ github.workspace }}/${{ inputs.baseline_name }}'
+
+    - if: ${{ github.event_name == 'pull_request' }}
+      name: Show veristat comparison
+      shell: bash
+      run: ./.github/scripts/compare-veristat-results.sh
+      env:
+        BASELINE_PATH: ${{ github.workspace }}/${{ inputs.baseline_name }}
+        VERISTAT_OUTPUT: ${{ inputs.veristat_output }}
+
+    # For push: just put baseline log to cache
+    - if: ${{ github.event_name == 'push' }}
+      shell: bash
+      run: |
+        mv "${{ github.workspace }}/${{ inputs.veristat_output }}" \
+           "${{ github.workspace }}/${{ inputs.baseline_name }}"
+
+    - if: ${{ github.event_name == 'push' }}
+      uses: actions/cache/save@v4
+      with:
+        key: ${{ github.ref_name }}-${{ inputs.baseline_name }}-${{ github.run_id }}
+        path: '${{ github.workspace }}/${{ inputs.baseline_name }}'

.github/scripts/collect-scx-bpf-progs.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+PROGS_DIR=$1
+
+mkdir -p "${PROGS_DIR}"
+
+find "${SCX_BUILD_OUTPUT}" -type f -name "bpf.bpf.o" -print0 | \
+while IFS= read -r -d '' prog; do
+    obj_name=$(echo "$prog" | grep -o "scx.*.bpf.o" | tr / _)
+    cp -v "$prog" "${PROGS_DIR}/${obj_name}"
+done

.github/scripts/compare-veristat-results.sh

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+#!/bin/bash
+
+if [[ ! -f "${BASELINE_PATH}" ]]; then
+    echo "# No ${BASELINE_PATH} available" >> "${GITHUB_STEP_SUMMARY}"
+
+    echo "No ${BASELINE_PATH} available"
+    echo "Printing veristat results"
+    cat "${VERISTAT_OUTPUT}"
+
+    exit 0
+fi
+
+veristat=$(realpath selftests/bpf/veristat)
+cmp_out=$(mktemp veristate_compare_out_XXXXXX.csv)
+
+$veristat \
+    --output-format csv \
+    --emit file,prog,verdict,states \
+    --compare "${BASELINE_PATH}" "${VERISTAT_OUTPUT}" > $cmp_out
+
+python3 ./.github/scripts/veristat_compare.py $cmp_out
+exit_code=$?
+
+echo
+# if comparison failed, print verifier log for failure mismatches
+if [[ -n "$VERISTAT_DUMP_LOG_ON_FAILURE" && $exit_code -ne 0 ]]; then
+    cat $cmp_out | tail -n +1 | \
+    while read -r line; do
+        verdict=$(echo $line | cut -d',' -f4)
+        verdict_diff=$(echo $line | cut -d',' -f5)
+        if [[ "$verdict" == "failure" && "$verdict_diff" == "MISMATCH" ]]; then
+            file=$(echo $line | cut -d',' -f1)
+            prog=$(echo $line | cut -d',' -f2)
+            echo "VERIFIER LOG FOR $file/$prog:"
+            echo "=================================================================="
+            $veristat -v $VERISTAT_OBJECTS_DIR/$file -f $prog 2>&1
+            echo "=================================================================="
+        fi
+    done
+fi
+
+exit $exit_code

.github/scripts/download-gcc-bpf.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+GCC_BPF_RELEASE_GH_REPO=$1
+INSTALL_DIR=$(realpath $2)
+
+cd /tmp
+
+tag=$(gh release list -L 1 -R ${GCC_BPF_RELEASE_GH_REPO} --json tagName -q .[].tagName)
+if [[ -z "$tag" ]]; then
+    echo "Could not find latest GCC BPF release at ${GCC_BPF_RELEASE_GH_REPO}"
+    exit 1
+fi
+
+url="https://github.com/${GCC_BPF_RELEASE_GH_REPO}/releases/download/${tag}/${tag}.tar.zst"
+echo "Downloading $url"
+wget -q "$url"
+
+tarball=${tag}.tar.zst
+dir=$(tar tf $tarball | head -1 || true)
+
+echo "Extracting $tarball ..."
+tar -I zstd -xf $tarball && rm -f $tarball
+
+rm -rf $INSTALL_DIR
+mv -v $dir $INSTALL_DIR
+
+cd -
+