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| author | Stanislav Fomichev <[email protected]> | 2025-03-08 04:47:26 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2025-03-12 20:02:00 +0000 |
| commit | 0a13c1e0a449917b29c45d90701eededa69c99d3 (patch) | |
| tree | e8870c1e14a58acf0a4bee7ab2937e607cfa9752 /tools/testing/selftests/kvm/x86/nested_exceptions_test.c | |
| parent | docs: netdev: add a note on selftest posting (diff) | |
| download | kernel-0a13c1e0a449917b29c45d90701eededa69c99d3.tar.gz kernel-0a13c1e0a449917b29c45d90701eededa69c99d3.zip | |
net: revert to lockless TC_SETUP_BLOCK and TC_SETUP_FT
There is a couple of places from which we can arrive to ndo_setup_tc
with TC_SETUP_BLOCK/TC_SETUP_FT:
- netlink
- netlink notifier
- netdev notifier
Locking netdev too deep in this call chain seems to be problematic
(especially assuming some/all of the call_netdevice_notifiers
NETDEV_UNREGISTER) might soon be running with the instance lock).
Revert to lockless ndo_setup_tc for TC_SETUP_BLOCK/TC_SETUP_FT. NFT
framework already takes care of most of the locking. Document
the assumptions.
ndo_setup_tc TC_SETUP_BLOCK
nft_block_offload_cmd
nft_chain_offload_cmd
nft_flow_block_chain
nft_flow_offload_chain
nft_flow_rule_offload_abort
nft_flow_rule_offload_commit
nft_flow_rule_offload_commit
nf_tables_commit
nfnetlink_rcv_batch
nfnetlink_rcv_skb_batch
nfnetlink_rcv
nft_offload_netdev_event
NETDEV_UNREGISTER notifier
ndo_setup_tc TC_SETUP_FT
nf_flow_table_offload_cmd
nf_flow_table_offload_setup
nft_unregister_flowtable_hook
nft_register_flowtable_net_hooks
nft_flowtable_update
nf_tables_newflowtable
nfnetlink_rcv_batch (.call NFNL_CB_BATCH)
nft_flowtable_update
nf_tables_newflowtable
nft_flowtable_event
nf_tables_flowtable_event
NETDEV_UNREGISTER notifier
__nft_unregister_flowtable_net_hooks
nft_unregister_flowtable_net_hooks
nf_tables_commit
nfnetlink_rcv_batch (.call NFNL_CB_BATCH)
__nf_tables_abort
nf_tables_abort
nfnetlink_rcv_batch
__nft_release_hook
__nft_release_hooks
nf_tables_pre_exit_net -> module unload
nft_rcv_nl_event
netlink_register_notifier (oh boy)
nft_register_flowtable_net_hooks
nft_flowtable_update
nf_tables_newflowtable
nf_tables_newflowtable
Fixes: c4f0f30b424e ("net: hold netdev instance lock during nft ndo_setup_tc")
Signed-off-by: Stanislav Fomichev <[email protected]>
Reported-by: [email protected]
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Diffstat (limited to 'tools/testing/selftests/kvm/x86/nested_exceptions_test.c')
0 files changed, 0 insertions, 0 deletions