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Vladimir Oltean says:
====================
Make DSA work with bonding's ARP monitor
Since commit 2b86cb8299 ("net: dsa: declare lockless TX feature for
slave ports") in v5.7, DSA breaks the ARP monitoring logic from the
bonding driver, fact which was pointed out by Brian Hutchinson who uses
a linux-5.10.y stable kernel.
Initially I got lured by other similar hacks introduced for other
NETIF_F_LLTX drivers, which, inspired by the bonding documentation,
update the trans_start of their TX queues by hand.
However Jakub pointed out that this simply isn't a proper solution, and
after coming to think more about it, I agree, and it doesn't work
properly with DSA nor is it maintainable for the future changes I plan
for it (multiple DSA masters in a LAG).
I've tested these changes using a DSA-based setup and a veth-based
setup, using the active-backup mode and ARP monitoring, with and without
arp_validate.
Link to v1:
https://patchwork.kernel.org/project/netdevbpf/patch/20220715232641.952532-1-vladimir.oltean@nxp.com/
Link to v2:
https://patchwork.kernel.org/project/netdevbpf/patch/20220727152000.3616086-1-vladimir.oltean@nxp.com/
====================
Link: https://lore.kernel.org/r/20220731124108.2810233-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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