netdev - [Patch bpf-next v5 0/3] bpf: introduce timeout hash map

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Message-Id: <20210122205415.113822-1-xiyou.wangcong@gmail.com>
Date:   Fri, 22 Jan 2021 12:54:12 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, jhs@...atatu.com, andrii@...nel.org,
        ast@...nel.org, daniel@...earbox.net, kafai@...com,
        Cong Wang <cong.wang@...edance.com>
Subject: [Patch bpf-next v5 0/3] bpf: introduce timeout hash map

From: Cong Wang <cong.wang@...edance.com>

This patchset introduces a new eBPF hash map whose elements have
timeouts. Patch 1 is the implementation of timeout map, patch 2 adds
some test cases for timeout map in test_maps, and patch 3 adds a test
case in map ptr test. This patchset has been tested with the provided
test cases for hours.

Please check each patch description for more details.

---
v5: add a lost piece of patch during rebase
    fix the extra_elems corner case
    add a stress test case

v4: merge gc_work into gc_idle_work to avoid a nasty race condition
    fix a potential use-after-free
    add one more test case
    improve comments and update changelog

v3: move gc list from bucket to elem
    reuse lru_node in struct htab_elem
    drop patches which are no longer necessary
    fix delete path
    add a test case for delete path
    add parallel test cases
    change timeout to ms
    drop batch ops

v2: fix hashmap ptr test
    add a test case in map ptr test
    factor out htab_timeout_map_alloc()

Cong Wang (3):
  bpf: introduce timeout hash map
  selftests/bpf: add test cases for bpf timeout map
  selftests/bpf: add timeout map check in map_ptr tests

 include/linux/bpf_types.h                     |   1 +
 include/uapi/linux/bpf.h                      |   5 +-
 kernel/bpf/hashtab.c                          | 274 +++++++++++++++++-
 kernel/bpf/syscall.c                          |   3 +-
 tools/include/uapi/linux/bpf.h                |   1 +
 .../selftests/bpf/progs/map_ptr_kern.c        |  20 ++
 tools/testing/selftests/bpf/test_maps.c       |  68 +++++
 7 files changed, 357 insertions(+), 15 deletions(-)

-- 
2.25.1