netdev - [PATCH net-next 1/2] ibmvnic: improve failover sysfs entry

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Date:   Mon, 12 Apr 2021 02:43:29 -0500
From:   Lijun Pan <lijunp213@...il.com>
To:     netdev@...r.kernel.org
Cc:     Lijun Pan <lijunp213@...il.com>
Subject: [PATCH net-next 1/2] ibmvnic: improve failover sysfs entry

The current implementation replies on H_IOCTL call to issue a
H_SESSION_ERR_DETECTED command to let the hypervisor to send a failover
signal. However, it may not work while the vnic is already in error
state, e.g., "ibmvnic 30000003 env3: rx buffer returned with rc 6".
Add a last resort, that is to schedule a failover reset via CRQ command.

Signed-off-by: Lijun Pan <lijunp213@...il.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index ee9bf18c597f..d44a7b5b8f67 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -5512,14 +5512,14 @@ static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
 	rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
 				H_SESSION_ERR_DETECTED, session_token, 0, 0);
 	if (rc) {
-		netdev_err(netdev, "Client initiated failover failed, rc %ld\n",
+		netdev_err(netdev,
+			   "H_VIOCTL initiated failover failed, rc %ld, trying to send CRQ_CMD, the last resort\n",
 			   rc);
-		return -EINVAL;
+		ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
 	}
 
 	return count;
 }
-
 static DEVICE_ATTR_WO(failover);
 
 static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
-- 
2.23.0