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Milan Landaverde says:
====================
Currently in bpftool's feature probe, we incorrectly tell the user that
all of the helper functions are supported for program types where helper
probing fails or is explicitly unsupported[1]:
$ bpftool feature probe
...
eBPF helpers supported for program type tracing:
- bpf_map_lookup_elem
- bpf_map_update_elem
- bpf_map_delete_elem
...
- bpf_redirect_neigh
- bpf_check_mtu
- bpf_sys_bpf
- bpf_sys_close
This patch adjusts bpftool to relay to the user when helper support
can't be determined:
$ bpftool feature probe
...
eBPF helpers supported for program type lirc_mode2:
Program type not supported
eBPF helpers supported for program type tracing:
Could not determine which helpers are available
eBPF helpers supported for program type struct_opts:
Could not determine which helpers are available
eBPF helpers supported for program type ext:
Could not determine which helpers are available
Rather than imply that no helpers are available for the program type, we
let the user know that helper function probing failed entirely.
[1] https://lore.kernel.org/bpf/20211217171202.3352835-2-andrii@kernel.org/
====================
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.