Hello,
We are having some doubts about the use of the const qualifier for the
key argument in functions to access eBPF maps, both, from user space and
within eBPF programs.
According to our understanding the key is not modified when used to
access the maps, however we noticed that in the bpf_*_elem functions
[1] and in the array_map_*_elem functions [2] the const qualifier is not
used. Is there any particular reason for avoid using it?
An additional question: how is the prototype of the map.lookup function
provided by bcc generated?
We are asking it because we think that the lack of the const qualifier
is causing some problems in the loop unrolling procedure [3].
Thank you very much,
Mauricio
[1]https://github.com/torvalds/linux/blob/master/samples/bpf/libbpf.h#L9-L11
[2] https://github.com/torvalds/linux/blob/master/kernel/bpf/arraymap.c#L110
[3]
https://lists.iovisor.org/pipermail/iovisor-dev/2016-December/000539.html
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