Alexandra Winter 521c65b649 s390/qeth: implement ndo_bridge_setlink for learning_sync ... Documentation/networking/switchdev.txt and 'man bridge' indicate that the learning_sync bridge attribute is used to control whether a given device will sync MAC addresses learned on its device port to a master bridge FDB, where they will show up as 'extern_learn offload'. So we map qeth_l2_dev2br_an_set() to the learning_sync bridge link attribute. Turning off learning_sync will flush all extern_learn entries from the bridge fdb and all pending events from the card's work queue. When the hardware interface goes offline with learning_sync on (e.g. for HW recovery), all extern_learn entries will be flushed from the bridge fdb and all pending events from the card's work queue. When the interface goes online again, it will send new notifications for all then valid MACs. learning_sync attribute can not be modified while interface is offline. See 'commit e6e771b3d8 ("s390/qeth: detach netdevice while card is offline")' An alternative implementation would be to always offload the 'learning' attribute of a software bridge to the hardware interface attached to it and thus implicitly enable fdb notification. This was not chosen for 2 reasons: 1) In our case the software bridge is NOT a representation of a hardware switch. It is just connected to a smart NIC that is able to inform about the addresses attached to it. It is not necessarily using source MAC learning for this and other bridgeports can be attached to other NICs with different properties. 2) We want a means to enable this notification explicitly. There may be cases where a bridgeport is set to 'learning', but we do not want to enable the notification. Signed-off-by: Alexandra Winter <wintera@linux.ibm.com> Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2020-09-15 13:21:47 -07:00
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block	s390/dasd: Use struct_size() helper	2020-07-15 08:47:11 -06:00
char	s390/tty3270: remove function callback casts	2020-07-01 20:00:55 +02:00
cio	s390/cio: Helper functions to read CSSID, IID, and CHID	2020-09-15 13:21:46 -07:00
crypto	s390/pkey: remove redundant variable initialization	2020-08-11 18:16:31 +02:00
net	s390/qeth: implement ndo_bridge_setlink for learning_sync	2020-09-15 13:21:47 -07:00
scsi	scsi: zfcp: Fix use-after-free in request timeout handlers	2020-08-17 22:12:09 -04:00
virtio	s390/virtio: remove unused pm callbacks	2020-06-16 13:44:04 +02:00
Makefile	s390: remove pointless drivers-y in drivers/s390/Makefile	2019-09-16 13:21:51 +02:00