From: "D. Wythe" <alibuda@xxxxxxxxxxxxxxxxx> This patches attempt to implements updating of progs within bpf netfilter link, allowing user update their ebpf netfilter prog in hot update manner. Besides, a corresponding test case has been added to verify whether the update works. -- v1: 1. remove unnecessary context, access the prog directly via rcu. 2. remove synchronize_rcu(), dealloc the nf_link via kfree_rcu. 3. check the dead flag during the update. -- v1->v2: 1. remove unnecessary nf_prog, accessing nf_link->link.prog in direct. -- v2->v3: 1. access nf_link->link.prog via rcu_dereference_raw to avoid warning. -- v3->v4: 1. remove mutex for link update, as it is unnecessary and can be replaced by atomic operations. -- v4->v5: 1. fix error retval check on cmpxhcg D. Wythe (2): netfilter: bpf: support prog update selftests/bpf: Add netfilter link prog update test net/netfilter/nf_bpf_link.c | 50 ++++++++----- .../bpf/prog_tests/netfilter_link_update_prog.c | 83 ++++++++++++++++++++++ .../bpf/progs/test_netfilter_link_update_prog.c | 24 +++++++ 3 files changed, 141 insertions(+), 16 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/netfilter_link_update_prog.c create mode 100644 tools/testing/selftests/bpf/progs/test_netfilter_link_update_prog.c -- 1.8.3.1
