On Sat, Apr 8, 2023 at 8:34 PM Joanne Koong <joannelkoong@xxxxxxxxx> wrote:
>
> bpf_dynptr_get_size returns the number of useable bytes in a dynptr and
> bpf_dynptr_get_offset returns the current offset into the dynptr.
>
> Signed-off-by: Joanne Koong <joannelkoong@xxxxxxxxx>
> ---
> include/linux/bpf.h | 2 +-
> kernel/bpf/helpers.c | 24 +++++++++++++++++++++---
> kernel/trace/bpf_trace.c | 4 ++--
> 3 files changed, 24 insertions(+), 6 deletions(-)
>
[...]
> +__bpf_kfunc __u32 bpf_dynptr_get_size(const struct bpf_dynptr_kern *ptr)
> +{
> + if (!ptr->data)
> + return -EINVAL;
> +
> + return __bpf_dynptr_get_size(ptr);
> +}
> +
> +__bpf_kfunc __u32 bpf_dynptr_get_offset(const struct bpf_dynptr_kern *ptr)
I think get_offset is actually not essential and it's hard to think
about the case where this is going to be really necessary. Let's keep
only get_size for now?
> +{
> + if (!ptr->data)
> + return -EINVAL;
> +
> + return ptr->offset;
> +}
> +
[...]
