bpftool:tldr:7642a

The bpftool map list command is used to list all the BPF (Berkeley Packet Filter) maps that are currently loaded in the Linux kernel.

BPF maps are data structures that allow BPF programs to store key-value pairs or arrays of values. They are used for various purposes such as packet filtering, packet modification, and statistics gathering.

When you run the bpftool map list command, it queries the BPF subsystem in the kernel for the list of currently loaded BPF maps. The command then retrieves and displays information about each map, such as the map ID, map type, map name, number of entries, and maximum number of entries.

This command is useful when working with BPF programs and maps, as it provides a quick overview of the existing BPF maps in the system and their properties. It helps in troubleshooting, debugging, and managing BPF-related tasks.