Merge branch 'Add lookup_and_delete_elem support to BPF hash map types'

Denis Salopek says:

====================

This patch series extends the existing bpf_map_lookup_and_delete_elem()
functionality with 4 more map types:
 - BPF_MAP_TYPE_HASH,
 - BPF_MAP_TYPE_PERCPU_HASH,
 - BPF_MAP_TYPE_LRU_HASH and
 - BPF_MAP_TYPE_LRU_PERCPU_HASH.

Patch 1 adds most of its functionality and logic as well as
documentation.

As it was previously limited to only stacks and queues which do not
support the BPF_F_LOCK flag, patch 2 enables its usage by adding a new
libbpf API bpf_map_lookup_and_delete_elem_flags() based on the existing
bpf_map_lookup_elem_flags().

Patch 3 adds selftests for lookup_and_delete_elem().

Changes in patch 1:
v7: Minor formating nits, add Acked-by.
v6: Remove unneeded flag check, minor code/format fixes.
v5: Split patch to 3 patches. Extend BPF_MAP_LOOKUP_AND_DELETE_ELEM
documentation with this changes.
v4: Fix the return value for unsupported map types.
v3: Add bpf_map_lookup_and_delete_elem_flags() and enable BPF_F_LOCK
flag, change CHECKs to ASSERT_OKs, initialize variables to 0.
v2: Add functionality for LRU/per-CPU, add test_progs tests.

Changes in patch 2:
v7: No change.
v6: Add Acked-by.
v5: Move to the newest libbpf version (0.4.0).

Changes in patch 3:
v7: Remove ASSERT_GE macro which is already added in some other commit,
change ASSERT_OK to ASSERT_OK_PTR, add Acked-by.
v6: Remove PERCPU macros, add ASSERT_GE macro to test_progs.h, remove
leftover code.
v5: Use more appropriate macros. Better check for changed value.
====================

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

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