Hengqi Chen

Misc fix

10

1. code cleanup(comments, unused codes, indention etc.) 2. sync with latest libbpf, replace deprecated API usage and fix memory leak.

Questions about experiment01-tailgrow

7

I play around with the `xdp_prog_kern.c` in `experiment01-tailgrow`, I change the `MIN_LEN` to `0` and `1`, but they both failed. Can anyone help answer this, thanks.

libbpf-tools: Add mysqld_qslower

1

Signed-off-by: Hengqi Chen

Allow attach uprobe/uretprobe with symbol addr. ping @schu

perf_submit NOT works with array ?

1

The following code crashes, but when the array is wrap in a struct, it works properly. ```c #include BPF_PERF_OUTPUT(trace); inline int capture_args(struct pt_regs *ctx) { u8 buf[32] = {0}; u64*...

Simplify BPF tracing implementation

1

* Remove all `__always_inline` from BPF program, this reduces size of `trace_bpfel_x86.o` file * Replace `memcpy`(from ``) with `__builtin_memcpy` * Simplify `get_goroutine_id` implementation, we don't need a extra BPF ringbuf

Failed to build bpftool from source

7

```shell clang \ -I. \ -I/home/ubuntu/bpf/bpftool/include/uapi/ \ -I/home/ubuntu/bpf/bpftool/src/bootstrap/libbpf/include \ -g -O2 -Wall -target bpf -c skeleton/pid_iter.bpf.c -o pid_iter.bpf.o skeleton/pid_iter.bpf.c:47:14: error: incomplete definition of type 'struct bpf_perf_link' perf_link = container_of(link, struct...

aya-bpf/maps: Add skb_output/xdp_output to PerfEventArray

5

`skb_output` and `xdp_output` are simple wrappers around the existing `output_at_index` method. With these wrappers, we can easily submit the raw data blob held by `struct __sk_buff *`/`struct xdp_md *` to...

Allow libbpf-tools to run on old kernels

2

We have a bunch of libbpf tools require features like `fentry` / `tp_btf` which only available on kernel v5.5+. Running these tools on old kernels result in EINVAL. Instead of...

libbpf-tools: Add tcpaccept

2

```shell $ sudo ./tcpaccept PID COMM IP RADDR RPORT LADDR LPORT 1407454 nc 4 9.1.128.159 39688 127.0.0.1 1215 ```` Signed-off-by: Hengqi Chen