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ibmvnic: driver initialization for kdump/kexec

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When booting into the kdump/kexec kernel, pHyp and vios
are not prepared for the initialization crq request and
a failover transport event is generated. This is not
handled correctly.

At this point in initialization the driver is still in
the 'probing' state and cannot handle a full reset of the
driver as is normally done for a failover transport event.

To correct this we catch driver resets while still in the
'probing' state and return EAGAIN. This results in the
driver tearing down the main crq and calling ibmvnic_init()
again.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nathan Fontenot 2017-06-15 14:48:09 -04:00 committed by David S. Miller
parent 247488c0a4
commit 6a2fb0e99f
1 changed files with 19 additions and 5 deletions
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24
drivers/net/ethernet/ibm/ibmvnic.c
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@ -1454,6 +1454,12 @@ static void ibmvnic_reset(struct ibmvnic_adapter *adapter,
return;
}
if (adapter->state == VNIC_PROBING) {
netdev_warn(netdev, "Adapter reset during probe\n");
adapter->init_done_rc = EAGAIN;
return;
}
mutex_lock(&adapter->rwi_lock);
list_for_each(entry, &adapter->rwi_list) {
@ -3649,12 +3655,18 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
adapter->from_passive_init = false;
init_completion(&adapter->init_done);
adapter->init_done_rc = 0;
ibmvnic_send_crq_init(adapter);
if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
dev_err(dev, "Initialization sequence timed out\n");
return -1;
}
if (adapter->init_done_rc) {
release_crq_queue(adapter);
return adapter->init_done_rc;
}
if (adapter->from_passive_init) {
adapter->state = VNIC_OPEN;
adapter->from_passive_init = false;
@ -3723,11 +3735,13 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
mutex_init(&adapter->rwi_lock);
adapter->resetting = false;
rc = ibmvnic_init(adapter);
if (rc) {
free_netdev(netdev);
return rc;
}
do {
rc = ibmvnic_init(adapter);
if (rc != EAGAIN) {
free_netdev(netdev);
return rc;
}
} while (rc == EAGAIN);
netdev->mtu = adapter->req_mtu - ETH_HLEN;