linux_dsm_epyc7002/drivers/net/bonding
Thomas Falcon 12185dfe44 bonding: Force slave speed check after link state recovery for 802.3ad
The following scenario was encountered during testing of logical
partition mobility on pseries partitions with bonded ibmvnic
adapters in LACP mode.

1. Driver receives a signal that the device has been
   swapped, and it needs to reset to initialize the new
   device.

2. Driver reports loss of carrier and begins initialization.

3. Bonding driver receives NETDEV_CHANGE notifier and checks
   the slave's current speed and duplex settings. Because these
   are unknown at the time, the bond sets its link state to
   BOND_LINK_FAIL and handles the speed update, clearing
   AD_PORT_LACP_ENABLE.

4. Driver finishes recovery and reports that the carrier is on.

5. Bond receives a new notification and checks the speed again.
   The speeds are valid but miimon has not altered the link
   state yet.  AD_PORT_LACP_ENABLE remains off.

Because the slave's link state is still BOND_LINK_FAIL,
no further port checks are made when it recovers. Though
the slave devices are operational and have valid speed
and duplex settings, the bond will not send LACPDU's. The
simplest fix I can see is to force another speed check
in bond_miimon_commit. This way the bond will update
AD_PORT_LACP_ENABLE if needed when transitioning from
BOND_LINK_FAIL to BOND_LINK_UP.

CC: Jarod Wilson <jarod@redhat.com>
CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-07-22 12:09:32 -07:00
..
bond_3ad.c bonding/802.3ad: convert to using slave printk macros 2019-06-09 13:36:01 -07:00
bond_alb.c bonding/alb: convert to using slave printk macros 2019-06-09 13:36:01 -07:00
bond_debugfs.c bonding: convert to DEFINE_SHOW_ATTRIBUTE 2018-12-10 12:05:20 -08:00
bond_main.c bonding: Force slave speed check after link state recovery for 802.3ad 2019-07-22 12:09:32 -07:00
bond_netlink.c bonding: fix value exported by Netlink for peer_notif_delay 2019-07-08 19:28:44 -07:00
bond_options.c bonding: add an option to specify a delay between peer notifications 2019-07-04 12:30:48 -07:00
bond_procfs.c bonding: add an option to specify a delay between peer notifications 2019-07-04 12:30:48 -07:00
bond_sysfs_slave.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
bond_sysfs.c bonding: add an option to specify a delay between peer notifications 2019-07-04 12:30:48 -07:00
bonding_priv.h
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00