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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jun 2025 07:32:42.7492 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c90acd5a-fdd6-4085-7ba5-08ddb483a345 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB77.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4462 Patch #1 adds a new neighbor flag ("extern_valid") that prevents the kernel from invalidating or removing a neighbor entry, while allowing the kernel to notify user space when the entry becomes reachable. See motivation and implementation details in the commit message. Patch #2 adds a selftest. Changes since v1 [1]: * Patch #1: s/neigbor/neighbor/ in comment. * Patch #1: Do not flush "extern_valid" entries upon carrier down. * Patch #1: Reword some parts of the commit message. * Patch #2: Fix various shellcheck warnings. * Patch #2: Add tests for interface and carrier down. [1] https://lore.kernel.org/netdev/20250611141551.462569-1-idosch@nvidia.com/ Ido Schimmel (2): neighbor: Add NTF_EXT_VALIDATED flag for externally validated entries selftests: net: Add a selftest for externally validated neighbor entries Documentation/netlink/specs/rt-neigh.yaml | 1 + include/net/neighbour.h | 4 +- include/uapi/linux/neighbour.h | 5 + net/core/neighbour.c | 79 ++++- tools/testing/selftests/net/Makefile | 1 + tools/testing/selftests/net/test_neigh.sh | 366 ++++++++++++++++++++++ 6 files changed, 445 insertions(+), 11 deletions(-) create mode 100755 tools/testing/selftests/net/test_neigh.sh -- 2.49.0