[core] Extract ELF parser out of the BPF module and add build option …

…PIPY_BPF

CMakeLists.txt

@@ -8,6 +8,7 @@ project(pipy)
 
 option(PIPY_GUI "include builtin GUI" ON)
 option(PIPY_SAMPLES "include builtin sample scripts" ON)
+option(PIPY_BPF, "enable eBPF support" ON)
 option(PIPY_SOIL_FREED_SPACE "invalidate freed space for debugging" OFF)
 option(PIPY_ASSERT_SAME_THREAD "enable assertions for strict inner-thread data access" OFF)
 option(PIPY_ZLIB "external zlib location" "")
@@ -191,6 +192,7 @@ add_executable(pipy
   src/context.cpp
   src/data.cpp
   src/deframer.cpp
+  src/elf.cpp
   src/event.cpp
   src/event-queue.cpp
   src/fetch.cpp
@@ -324,6 +326,10 @@ if(PIPY_SAMPLES)
   add_dependencies(pipy PackSamples)
 endif()
 
+if(PIPY_BPF)
+  add_definitions(-DPIPY_USE_BPF)
+endif()
+
 if(PIPY_SOIL_FREED_SPACE)
   add_definitions(-DPIPY_SOIL_FREED_SPACE)
 endif()
@@ -357,4 +363,4 @@ target_link_libraries(
   leveldb
   -pthread
   -ldl
-)
+)

samples/bpf/load-balancer/test.sh

@@ -23,13 +23,13 @@ setup_net server3 veth3 10.0.3.100/24 10.0.3.200/24
 sleep 1
 
 echo 'Starting upstream servers...'
-ip netns exec server1 ../../../bin/pipy -e 'pipy().listen(8080).serveHTTP(new Message("hi from server1\n"))' &
-ip netns exec server2 ../../../bin/pipy -e 'pipy().listen(8080).serveHTTP(new Message("hi from server2\n"))' &
-ip netns exec server3 ../../../bin/pipy -e 'pipy().listen(8080).serveHTTP(new Message("hi from server3\n"))' &
+ip netns exec server1 ../../../bin/pipy -e 'pipy().listen(8080).serveHTTP(new Message("hi from server1\n"))' 2> /dev/null &
+ip netns exec server2 ../../../bin/pipy -e 'pipy().listen(8080).serveHTTP(new Message("hi from server2\n"))' 2> /dev/null &
+ip netns exec server3 ../../../bin/pipy -e 'pipy().listen(8080).serveHTTP(new Message("hi from server3\n"))' 2> /dev/null &
 sleep 1
 
 echo 'Loading BPF programs...'
-/home/shuang/git/bpftool/src/bpftool prog load /home/shuang/git/pipy/bin/load-balancer.o /sys/fs/bpf/lb
+bpftool prog load /home/shuang/git/pipy/bin/load-balancer.o /sys/fs/bpf/lb
 ip link set lo xdpgeneric pinned /sys/fs/bpf/lb
 ip link set veth0 xdpgeneric pinned /sys/fs/bpf/lb
 ip link set veth1 xdpgeneric pinned /sys/fs/bpf/lb