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authorJoseph Huang <Joseph.Huang@garmin.com>2025-03-06 20:23:05 +0300
committerJakub Kicinski <kuba@kernel.org>2025-03-08 06:36:33 +0300
commitdc5340c3133a3ebe54853fd299116149e528cfaa (patch)
tree9540ba4b7b52071a54510f0aeedae14a9a2e8477 /net/switchdev/switchdev.c
parentd749d901b2168389f060b654fdaa08acf6b367d2 (diff)
downloadlinux-dc5340c3133a3ebe54853fd299116149e528cfaa.tar.xz
net: dsa: mv88e6xxx: Verify after ATU Load ops
ATU Load operations could fail silently if there's not enough space on the device to hold the new entry. When this happens, the symptom depends on the unknown flood settings. If unknown multicast flood is disabled, the multicast packets are dropped when the ATU table is full. If unknown multicast flood is enabled, the multicast packets will be flooded to all ports. Either way, IGMP snooping is broken when the ATU Load operation fails silently. Do a Read-After-Write verification after each fdb/mdb add operation to make sure that the operation was really successful, and return -ENOSPC otherwise. Fixes: defb05b9b9b4 ("net: dsa: mv88e6xxx: Add support for fdb_add, fdb_del, and fdb_getnext") Signed-off-by: Joseph Huang <Joseph.Huang@garmin.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://patch.msgid.link/20250306172306.3859214-1-Joseph.Huang@garmin.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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