On 6/19/25 18:19, Eduard Zingerman wrote:
On Thu, 2025-06-19 at 10:09 -0700, Ihor Solodrai wrote:
[...]
But then, does memset even make sense for xdp/skb buffers?
Why not?
Maybe -ENOTSUPP is more appropriate?
I'd appreciate any hints.
I think Mykyta has kernel/trace/bpf_trace.c:__bpf_dynptr_copy_str() in mind.
Right, similarly to `__bpf_dynptr_copy` from bpf_trace.c: fast path if
destination has enough contiguous memory,
just call memset.
Slow path - use temp buffer, that you can memset once and then
__bpf_dynptr_write it in a loop. __bpf_dynptr_write
handles the trickiness of the non-contiguous buffers.
