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* [PATCH V2 net] ibmvnic: Continue with reset if set link down failed
@ 2021-04-20 21:35 Dany Madden
  2021-04-20 21:42 ` Lijun Pan
  2021-04-22  5:30 ` Lijun Pan
  0 siblings, 2 replies; 16+ messages in thread
From: Dany Madden @ 2021-04-20 21:35 UTC (permalink / raw)
  To: davem, kuba; +Cc: tlfalcon, netdev, paulus, drt, sukadev, linuxppc-dev

When ibmvnic gets a FATAL error message from the vnicserver, it marks
the Command Respond Queue (CRQ) inactive and resets the adapter. If this
FATAL reset fails and a transmission timeout reset follows, the CRQ is
still inactive, ibmvnic's attempt to set link down will also fail. If
ibmvnic abandons the reset because of this failed set link down and this
is the last reset in the workqueue, then this adapter will be left in an
inoperable state.

Instead, make the driver ignore this link down failure and continue to
free and re-register CRQ so that the adapter has an opportunity to
recover.

Fixes: ed651a10875f ("ibmvnic: Updated reset handling")
Signed-off-by: Dany Madden <drt@linux.ibm.com>
Reviewed-by: Rick Lindsley <ricklind@linux.ibm.com>
Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
---
Changes in V2:
- Update description to clarify background for the patch
- Include Reviewed-by tags
---
 drivers/net/ethernet/ibm/ibmvnic.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index ffb2a91750c7..4bd8c5d1a275 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1970,8 +1970,10 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 			rtnl_unlock();
 			rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
 			rtnl_lock();
-			if (rc)
-				goto out;
+			if (rc) {
+				netdev_dbg(netdev,
+					   "Setting link down failed rc=%d. Continue anyway\n", rc);
+			}
 
 			if (adapter->state == VNIC_OPEN) {
 				/* When we dropped rtnl, ibmvnic_open() got
-- 
2.26.2


^ permalink raw reply	[flat|nested] 16+ messages in thread

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Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-20 21:35 [PATCH V2 net] ibmvnic: Continue with reset if set link down failed Dany Madden
2021-04-20 21:42 ` Lijun Pan
2021-04-21  6:45   ` Sukadev Bhattiprolu
2021-04-22  5:06     ` Lijun Pan
2021-04-22  6:58       ` Sukadev Bhattiprolu
2021-04-22  7:05       ` Rick Lindsley
2021-04-22 17:21       ` Michal Suchánek
2021-04-22 17:38         ` Lijun Pan
2021-04-23  2:26         ` Rick Lindsley
2021-05-04 19:05           ` Dany Madden
2021-04-21  7:54   ` Rick Lindsley
2021-04-22  5:12     ` Lijun Pan
2021-04-22  7:05       ` Rick Lindsley
2021-04-22  5:30 ` Lijun Pan
2021-04-22  7:07   ` Rick Lindsley
2021-04-22 17:01     ` Lijun Pan

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