netdev - Re: [PATCH net-next v2 2/2] selftests: net: use the dummy bpf from net/lib

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Message-ID: <20250306125601.522b285a@kernel.org>
Date: Thu, 6 Mar 2025 12:56:01 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
 pabeni@...hat.com, andrew+netdev@...n.ch, horms@...nel.org,
 shuah@...nel.org, willemb@...gle.com, petrm@...dia.com, sdf@...ichev.me,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] selftests: net: use the dummy bpf from
 net/lib

On Thu, 06 Mar 2025 14:35:09 -0500 Willem de Bruijn wrote:
> How does tools/testing/selftests/net/lib get compiled? 
> The other subdirs of net are separate explicit targets in
> tools/testing/selftests/Makefile

There is some magic / hack at top level:

# Networking tests want the net/lib target, include it automatically  
ifneq ($(filter net drivers/net drivers/net/hw,$(TARGETS)),)    
ifeq ($(filter net/lib,$(TARGETS)),)    
        INSTALL_DEP_TARGETS := net/lib  
endif  
endif  

https://web.git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/tools/testing/selftests/Makefile#n129

> And what is the magic that avoids the need for adding bpf objects to
> .gitignore?

All BPF files are suffixed with .bpf.c and we turn that into .bpf.o
So they have an .o at the end, I think the global gitignore ignores
those?