On Mon, 27 Oct 2025 19:19:27 +0100 Robin Jarry <[email protected]> wrote:
> The TAP driver currently uses ioctl operations which are name-based and > namespace-unaware. When an interface is moved to another namespace, the > driver loses control and cannot track the device. > > This series migrates to netlink-based interface control using ifindex > instead of names, making operations namespace-safe. When an interface > moves to another namespace, the driver detects RTM_DELLINK, queries the > new namespace using TUNGETDEVNETNS, and recreates netlink sockets in > that namespace to maintain control. > > The implementation falls back to ioctl when netlink is unavailable, > preserving compatibility with older kernels. > > Tested by moving TAP interfaces between namespaces while running > testpmd. All link operations continue to work transparently after > namespace changes. > > v2: completely removed ioctl-based implementation > > Robin Jarry (3): > net/tap: add netlink helpers > net/tap: replace ioctl with netlink > net/tap: detect namespace change > > drivers/net/tap/rte_eth_tap.c | 412 +++++++++++++++++++--------------- > drivers/net/tap/rte_eth_tap.h | 5 +- > drivers/net/tap/tap_netlink.c | 291 ++++++++++++++++++++++++ > drivers/net/tap/tap_netlink.h | 10 +- > 4 files changed, 534 insertions(+), 184 deletions(-) > Any documentation or release notes?
