[PATCH net-next v01 0/4] net: af_packet: allow joining a fanout when link is down
From: Gur Stavi
Date: Mon Oct 07 2024 - 08:45:02 EST
PACKET socket can retain its fanout membership through link down and up
and (obviously) leave a fanout while it is not RUNNING (link down).
However, socket was forbidden from joining a fanout while it was not
RUNNING.
This patch allows PACKET socket to join a fanout while not RUNNING.
Selftest psock_fanout is extended to test this scenario.
This is the only test that was performed.
This scenario was identified while studying DPDK pmd_af_packet_drv.
Since sockets are only created during initialization, there is no reason
to fail the initialization if a single link is temporarily down.
I hope it is not considered as breaking user space and that applications
are not designed to expect this failure.
Gur Stavi (4):
af_packet: allow fanout_add when socket is not RUNNING
selftests: net/psock_fanout: add loopback up/down toggle facility
selftests: net/psock_fanout: restore loopback up/down state on exit
selftests: net/psock_fanout: socket joins fanout when link is down
net/packet/af_packet.c | 10 +-
tools/testing/selftests/net/psock_fanout.c | 124 ++++++++++++++-------
2 files changed, 90 insertions(+), 44 deletions(-)
base-commit: c824deb1a89755f70156b5cdaf569fca80698719
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2.45.2