diff options
| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2025-07-03 23:48:07 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-07-04 05:30:06 +0300 |
| commit | 0426729f46cd1f6354fad07267a21579186a5757 (patch) | |
| tree | 15874a7d7c4c6ed22096afcdbe89eb2418350725 /include | |
| parent | da7e9c0a7fbc5b8552575db16c991e82b7c5fa5c (diff) | |
| download | linux-0426729f46cd1f6354fad07267a21579186a5757.tar.xz | |
bpf: Refactor bprintf buffer support
Refactor code to be able to get and put bprintf buffers and use
bpf_printf_prepare independently. This will be used in the next patch to
implement BPF streams support, particularly as a staging buffer for
strings that need to be formatted and then allocated and pushed into a
stream.
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250703204818.925464-2-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bpf.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 287c956cdbd2..a07451457d9e 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -3551,6 +3551,16 @@ bool btf_id_set_contains(const struct btf_id_set *set, u32 id); #define MAX_BPRINTF_VARARGS 12 #define MAX_BPRINTF_BUF 1024 +/* Per-cpu temp buffers used by printf-like helpers to store the bprintf binary + * arguments representation. + */ +#define MAX_BPRINTF_BIN_ARGS 512 + +struct bpf_bprintf_buffers { + char bin_args[MAX_BPRINTF_BIN_ARGS]; + char buf[MAX_BPRINTF_BUF]; +}; + struct bpf_bprintf_data { u32 *bin_args; char *buf; @@ -3558,9 +3568,12 @@ struct bpf_bprintf_data { bool get_buf; }; -int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, +int bpf_bprintf_prepare(const char *fmt, u32 fmt_size, const u64 *raw_args, u32 num_args, struct bpf_bprintf_data *data); void bpf_bprintf_cleanup(struct bpf_bprintf_data *data); +int bpf_try_get_buffers(struct bpf_bprintf_buffers **bufs); +void bpf_put_buffers(void); + #ifdef CONFIG_BPF_LSM void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype); |