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ibmvnic: Harden device Command Response Queue handshake

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In some cases, the device or firmware may be busy when the
driver attempts to perform the CRQ initialization handshake.
If the partner is busy, the hypervisor will return the H_CLOSED
return code. The aim of this patch is that, if the device is not
ready, to query the device a number of times, with a small wait
time in between queries. If all initialization requests fail,
the driver will remain in a dormant state, awaiting a signal
from the device that it is ready for operation.

Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Falcon 2020-08-31 11:59:57 -05:00 committed by David S. Miller
parent 150f29f5e6
commit 36a782fdcc
1 changed files with 18 additions and 1 deletions
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19
drivers/net/ethernet/ibm/ibmvnic.c
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@ -3566,14 +3566,31 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
union ibmvnic_crq crq;
int retries = 100;
int rc;
memset(&crq, 0, sizeof(crq));
crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
crq.generic.cmd = IBMVNIC_CRQ_INIT;
netdev_dbg(adapter->netdev, "Sending CRQ init\n");
return ibmvnic_send_crq(adapter, &crq);
do {
rc = ibmvnic_send_crq(adapter, &crq);
if (rc != H_CLOSED)
break;
retries--;
msleep(50);
} while (retries > 0);
if (rc) {
dev_err(dev, "Failed to send init request, rc = %d\n", rc);
return rc;
}
return 0;
}
static int send_version_xchg(struct ibmvnic_adapter *adapter)