After I start bmc, I can see that rx_filter has received data, but tx_filter has never been called.I don't see tx_filter being attached to the egress hook of tc in the code. Do I need to attach it separately?How to attach it？

Hi, I'm tring to build bmc, got the following error while building

I'm running this build in in following environment:

1. debian 11
2. clang 11, llvm 11
3. gcc 10.2.1
4. downloaded the kernel source by running apt source linux, and the kernel version is 5.10.84

gcc -g -O2 -Wall -I. -I../linux-5.10.84/tools/lib -I../linux-5.10.84/tools/include/uapi  -o bmc bmc_user.c ../linux-5.10.84/tools/lib/bpf/libbpf.a -L../linux-5.10.84/tools/lib/bpf -l:libbpf.a -lelf
In file included from /usr/include/linux/kernel.h:5,
                 from ../linux-5.10.84/tools/include/uapi/linux/netlink.h:5,
                 from ../linux-5.10.84/tools/include/uapi/linux/if_link.h:6,
                 from bmc_user.c:20:
/usr/include/linux/sysinfo.h:9:2: error: unknown type name ‘__kernel_long_t’
    9 |  __kernel_long_t uptime;  /* Seconds since boot */
      |  ^~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:10:2: error: unknown type name ‘__kernel_ulong_t’
   10 |  __kernel_ulong_t loads[3]; /* 1, 5, and 15 minute load averages */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:11:2: error: unknown type name ‘__kernel_ulong_t’
   11 |  __kernel_ulong_t totalram; /* Total usable main memory size */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:12:2: error: unknown type name ‘__kernel_ulong_t’
   12 |  __kernel_ulong_t freeram; /* Available memory size */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:13:2: error: unknown type name ‘__kernel_ulong_t’
   13 |  __kernel_ulong_t sharedram; /* Amount of shared memory */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:14:2: error: unknown type name ‘__kernel_ulong_t’
   14 |  __kernel_ulong_t bufferram; /* Memory used by buffers */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:15:2: error: unknown type name ‘__kernel_ulong_t’
   15 |  __kernel_ulong_t totalswap; /* Total swap space size */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:16:2: error: unknown type name ‘__kernel_ulong_t’
   16 |  __kernel_ulong_t freeswap; /* swap space still available */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:19:2: error: unknown type name ‘__kernel_ulong_t’
   19 |  __kernel_ulong_t totalhigh; /* Total high memory size */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:20:2: error: unknown type name ‘__kernel_ulong_t’
   20 |  __kernel_ulong_t freehigh; /* Available high memory size */
      |  ^~~~~~~~~~~~~~~~
/usr/include/linux/sysinfo.h:22:22: error: ‘__kernel_ulong_t’ undeclared here (not in a function)
   22 |  char _f[20-2*sizeof(__kernel_ulong_t)-sizeof(__u32)]; /* Padding: libc5 uses this.. */
      |                      ^~~~~~~~~~~~~~~~

./autogen.sh

fatal: No names found, cannot describe anything.
aclocal...
autoheader...
automake...
autoconf...
configure.ac:8: warning: 'AM_CONFIG_HEADER': this macro is obsolete.
configure.ac:8: You should use the 'AC_CONFIG_HEADERS' macro instead.
./lib/autoconf/general.m4:2434: AC_DIAGNOSE is expanded from...
aclocal.m4:745: AM_CONFIG_HEADER is expanded from...
configure.ac:8: the top level
configure.ac:79: warning: AC_PROG_CC_C99 is obsolete; use AC_PROG_CC
configure.ac:82: warning: ac_ext=c
configure.ac:82: ac_cpp='$CPP $CPPFLAGS'
configure.ac:82: ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
configure.ac:82: ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
configure.ac:82: ac_compiler_gnu=$ac_cv_c_compiler_gnu
configure.ac:82: if test -n "$ac_tool_prefix"; then
configure.ac:82:   # Extract the first word of "${ac_tool_prefix}gcc", so it can be a program name with args.
configure.ac:82: set dummy ${ac_tool_prefix}gcc; ac_word=$2
configure.ac:82: { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
configure.ac:82: printf %s "checking for $ac_word... " >&6; }
configure.ac:82: if test ${ac_cv_prog_CC+y}
configure.ac:82: then :
configure.ac:82:   printf %s "(cached) " >&6
configure.ac:82: else $as_nop
configure.ac:82:   if test -n "$CC"; then
configure.ac:82:   ac_cv_prog_CC="$CC" # Let the user override the test.
configure.ac:82: else
configure.ac:82: as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
configure.ac:82: for as_dir in $PATH
configure.ac:82: do
configure.ac:82:   IFS=$as_save_IFS
configure.ac:82:   case $as_dir in #(((
configure.ac:82:     '' is m4_require'd but not m4_defun'd
lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from...
lib/m4sugar/m4sh.m4:699: AS_IF is expanded from...
./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from...
./lib/autoconf/programs.m4:41: _AC_CHECK_PROG is expanded from...
./lib/autoconf/programs.m4:101: AC_CHECK_PROG is expanded from...
./lib/autoconf/programs.m4:221: AC_CHECK_TOOL is expanded from...
./lib/autoconf/c.m4:452: AC_PROG_CC is expanded from...
configure.ac:82: the top level

"make" works under bmc folder but ./bmc eth0 churns error below:

; for (off = 4; off < BMC_MAX_PACKET_LENGTH && payload+off+1 <= data_end && payload[off] == ' '; off++) {} // move offset to the start of the first key
46: (1f) r7 -= r8
47: (b7) r1 = 54
48: (bf) r2 = r7
49: (07) r2 += -50
; for (off = 4; off < BMC_MAX_PACKET_LENGTH && payload+off+1 <= data_end && payload[off] == ' '; off++) {} // move offset to the start of the first key
50: (1d) if r7 == r1 goto pc+23
 R0=map_value(id=0,off=0,ks=4,vs=12,imm=0) R1_w=inv54 R2_w=inv(id=0) R6=ctx(id=0,off=0,imm=0) R7_w=inv(id=3) R8=pkt(id=0,off=0,r=54,imm=0) R10=fp0 fp-8=mmmm????
; for (off = 4; off < BMC_MAX_PACKET_LENGTH && payload+off+1 <= data_end && payload[off] == ' '; off++) {} // move offset to the start of the first key
51: (bf) r3 = r8
52: (0f) r3 += r1
last_idx 52 first_idx 41
regs=2 stack=0 before 51: (bf) r3 = r8
regs=2 stack=0 before 50: (1d) if r7 == r1 goto pc+23
regs=2 stack=0 before 49: (07) r2 += -50
regs=2 stack=0 before 48: (bf) r2 = r7
regs=2 stack=0 before 47: (b7) r1 = 54
53: (71) r3 = *(u8 *)(r3 +0)
invalid access to packet, off=54 size=1, R3(id=0,off=54,r=54)
R3 offset is outside of the packet
processed 52 insns (limit 1000000) max_states_per_insn 0 total_states 4 peak_states 4 mark_read 2

libbpf: -- END LOG --
libbpf: failed to load program 'bmc_rx_filter'
libbpf: failed to load object './bmc_kern.o'
Error: bpf_object__load_xattr failed

bmc-cache/memcached-sr# CC=clang CFLAGS='-DREUSEPORT_OPT=1 -Wno-deprecated-declarations' ./configure && make

./configure: line 5148: syntax error near unexpected token `newline'

Hi! I see that BMC is using UDP get requests for benchmarks. I was wondering how you dealt with packet drops. Did the open-loop generator retransmit requests after some time?