Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+=================
+BPF Documentation
+=================
+
+This directory contains documentation for the BPF (Berkeley Packet
+Filter) facility, with a focus on the extended BPF version (eBPF).
+
+This kernel side documentation is still work in progress. The main
+textual documentation is (for historical reasons) described in
+:ref:`networking-filter`, which describe both classical and extended
+BPF instruction-set.
+The Cilium project also maintains a `BPF and XDP Reference Guide`_
+that goes into great technical depth about the BPF Architecture.
+
+The primary info for the bpf syscall is available in the `man-pages`_
+for `bpf(2)`_.
+
+BPF Type Format (BTF)
+=====================
+
+.. toctree::
+   :maxdepth: 1
+
+   btf
+
+
+Frequently asked questions (FAQ)
+================================
+
+Two sets of Questions and Answers (Q&A) are maintained.
+
+.. toctree::
+   :maxdepth: 1
+
+   bpf_design_QA
+   bpf_devel_QA
+
+
+Helper functions
+================
+
+* `bpf-helpers(7)`_ maintains a list of helpers available to eBPF programs.
+
+
+Program types
+=============
+
+.. toctree::
+   :maxdepth: 1
+
+   prog_cgroup_sockopt
+   prog_cgroup_sysctl
+   prog_flow_dissector
+   bpf_lsm
+   prog_sk_lookup
+
+
+Map types
+=========
+
+.. toctree::
+   :maxdepth: 1
+
+   map_cgroup_storage
+
+
+Testing and debugging BPF
+=========================
+
+.. toctree::
+   :maxdepth: 1
+
+   drgn
+   s390
+
+
+Other
+=====
+
+.. toctree::
+   :maxdepth: 1
+
+   ringbuf
+
+.. Links:
+.. _networking-filter: ../networking/filter.rst
+.. _man-pages: https://www.kernel.org/doc/man-pages/
+.. _bpf(2): https://man7.org/linux/man-pages/man2/bpf.2.html
+.. _bpf-helpers(7): https://man7.org/linux/man-pages/man7/bpf-helpers.7.html
+.. _BPF and XDP Reference Guide: https://docs.cilium.io/en/latest/bpf/