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Date: Thu, 22 Mar 2018 10:43:54 +0100
From: Daniel Borkmann <daniel@...earbox.net>
To: Alexei Starovoitov <ast@...com>, davem@...emloft.net
Cc: torvalds@...ux-foundation.org, peterz@...radead.org,
rostedt@...dmis.org, netdev@...r.kernel.org, kernel-team@...com,
linux-api@...r.kernel.org
Subject: Re: [PATCH v2 bpf-next 5/8] bpf: introduce BPF_RAW_TRACEPOINT
On 03/21/2018 07:54 PM, Alexei Starovoitov wrote:
[...]
> @@ -546,6 +556,53 @@ extern void ftrace_profile_free_filter(struct perf_event *event);
> void perf_trace_buf_update(void *record, u16 type);
> void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
>
> +void bpf_trace_run1(struct bpf_prog *prog, u64 arg1);
> +void bpf_trace_run2(struct bpf_prog *prog, u64 arg1, u64 arg2);
> +void bpf_trace_run3(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3);
> +void bpf_trace_run4(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4);
> +void bpf_trace_run5(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5);
> +void bpf_trace_run6(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6);
> +void bpf_trace_run7(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7);
> +void bpf_trace_run8(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8);
> +void bpf_trace_run9(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9);
> +void bpf_trace_run10(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10);
> +void bpf_trace_run11(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11);
> +void bpf_trace_run12(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12);
> +void bpf_trace_run13(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12,
> + u64 arg13);
> +void bpf_trace_run14(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12,
> + u64 arg13, u64 arg14);
> +void bpf_trace_run15(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12,
> + u64 arg13, u64 arg14, u64 arg15);
> +void bpf_trace_run16(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12,
> + u64 arg13, u64 arg14, u64 arg15, u64 arg16);
> +void bpf_trace_run17(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12,
> + u64 arg13, u64 arg14, u64 arg15, u64 arg16, u64 arg17);
> void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
> struct trace_event_call *call, u64 count,
> struct pt_regs *regs, struct hlist_head *head,
[...]
> @@ -896,3 +976,206 @@ int perf_event_query_prog_array(struct perf_event *event, void __user *info)
>
> return ret;
> }
> +
> +static __always_inline
> +void __bpf_trace_run(struct bpf_prog *prog, u64 *args)
> +{
> + rcu_read_lock();
> + preempt_disable();
> + (void) BPF_PROG_RUN(prog, args);
> + preempt_enable();
> + rcu_read_unlock();
> +}
> +
> +#define EVAL1(FN, X) FN(X)
> +#define EVAL2(FN, X, Y...) FN(X) EVAL1(FN, Y)
> +#define EVAL3(FN, X, Y...) FN(X) EVAL2(FN, Y)
> +#define EVAL4(FN, X, Y...) FN(X) EVAL3(FN, Y)
> +#define EVAL5(FN, X, Y...) FN(X) EVAL4(FN, Y)
> +#define EVAL6(FN, X, Y...) FN(X) EVAL5(FN, Y)
> +
> +#define COPY(X) args[X - 1] = arg##X;
> +
> +void bpf_trace_run1(struct bpf_prog *prog, u64 arg1)
> +{
> + u64 args[1];
> +
> + EVAL1(COPY, 1);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run1);
> +void bpf_trace_run2(struct bpf_prog *prog, u64 arg1, u64 arg2)
> +{
> + u64 args[2];
> +
> + EVAL2(COPY, 1, 2);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run2);
> +void bpf_trace_run3(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3)
> +{
> + u64 args[3];
> +
> + EVAL3(COPY, 1, 2, 3);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run3);
> +void bpf_trace_run4(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4)
> +{
> + u64 args[4];
> +
> + EVAL4(COPY, 1, 2, 3, 4);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run4);
> +void bpf_trace_run5(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5)
> +{
> + u64 args[5];
> +
> + EVAL5(COPY, 1, 2, 3, 4, 5);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run5);
> +void bpf_trace_run6(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6)
> +{
> + u64 args[6];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run6);
> +void bpf_trace_run7(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7)
> +{
> + u64 args[7];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL1(COPY, 7);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run7);
> +void bpf_trace_run8(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8)
> +{
> + u64 args[8];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL2(COPY, 7, 8);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run8);
> +void bpf_trace_run9(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9)
> +{
> + u64 args[9];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL3(COPY, 7, 8, 9);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run9);
> +void bpf_trace_run10(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10)
> +{
> + u64 args[10];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL4(COPY, 7, 8, 9, 10);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run10);
> +void bpf_trace_run11(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11)
> +{
> + u64 args[11];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL5(COPY, 7, 8, 9, 10, 11);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run11);
> +void bpf_trace_run12(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12)
> +{
> + u64 args[12];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL6(COPY, 7, 8, 9, 10, 11, 12);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run12);
> +void bpf_trace_run17(struct bpf_prog *prog, u64 arg1, u64 arg2,
> + u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
> + u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12,
> + u64 arg13, u64 arg14, u64 arg15, u64 arg16, u64 arg17)
> +{
> + u64 args[17];
> +
> + EVAL6(COPY, 1, 2, 3, 4, 5, 6);
> + EVAL6(COPY, 7, 8, 9, 10, 11, 12);
> + EVAL5(COPY, 13, 14, 15, 16, 17);
> + __bpf_trace_run(prog, args);
> +}
> +EXPORT_SYMBOL_GPL(bpf_trace_run17);
Would be nice if we could generate all these above via macro, e.g. when we define
a hard upper limit for max number of tracepoint args anyway, so this gets automatically
adjusted as well. Maybe some of the logic from BPF_CALL_*() macros could be borrowed
for this purpose.
Thanks,
Daniel
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