[PATCH net-next v2] ibmvnic: process HMC disable command

[Dany Madden <drt@linux.ibm.com>]

Currently ibmvnic does not support the "Disable vNIC" command from
the Hardware Management Console. The HMC uses this command to disconnect
the adapter from the network if the adapter is misbehaving or sending
malicious traffic. The effect of this command is equivalent to setting
the link to the "down" state on the linux client.

Enable support in ibmvnic driver for the Disable vNIC command.

Signed-off-by: Dany Madden <drt@linux.ibm.com>
---
V2 changes based on Jakub Kicinski's feedback:
- Broke from "[PATCH net 00/15] ibmvnic: assorted bug fixes" sent by Lijun Pan.
- Expanded on the description
- Submitting to net-next
---
 drivers/net/ethernet/ibm/ibmvnic.c | 40 ++++++++++++++++++++++++++++++
 drivers/net/ethernet/ibm/ibmvnic.h |  3 ++-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 63b39744a07a..47446e5f8ec5 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -109,6 +109,8 @@ static void release_crq_queue(struct ibmvnic_adapter *);
 static int __ibmvnic_set_mac(struct net_device *, u8 *);
 static int init_crq_queue(struct ibmvnic_adapter *adapter);
 static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
+static void ibmvnic_disable(struct ibmvnic_adapter *adapter);
+static int ibmvnic_close(struct net_device *netdev);
 
 struct ibmvnic_stat {
 	char name[ETH_GSTRING_LEN];
@@ -1207,6 +1209,42 @@ static int ibmvnic_open(struct net_device *netdev)
 	return rc;
 }
 
+static void ibmvnic_disable(struct ibmvnic_adapter *adapter)
+{
+	struct list_head *entry, *tmp_entry;
+	struct net_device *netdev = adapter->netdev;
+	int rc = 0;
+
+	/* cancel all pending resets in the queue */
+	if (!list_empty(&adapter->rwi_list)) {
+		list_for_each_safe(entry, tmp_entry, &adapter->rwi_list)
+			list_del(entry);
+	}
+
+	/* wait for current reset to finish */
+	flush_work(&adapter->ibmvnic_reset);
+	flush_delayed_work(&adapter->ibmvnic_delayed_reset);
+
+	if (test_bit(0, &adapter->resetting) ||
+	    adapter->state == VNIC_PROBED ||
+	    adapter->state == VNIC_OPEN ||
+	    adapter->state == VNIC_OPENING) {
+		rc = ibmvnic_close(netdev);
+		/* Expect -EINVAL when crq is no longer active. Set link down
+		 * would fail.
+		 */
+		if (rc && rc != -EINVAL) {
+			netdev_err(netdev, "Failed to disable adapter, rc=%d\n", rc);
+			return;
+		}
+	} else {
+		netdev_dbg(netdev, "Disable adapter request ignored (state=%d)\n", adapter->state);
+		return;
+	}
+
+	netdev_dbg(netdev, "Adapter disabled\n");
+}
+
 static void clean_rx_pools(struct ibmvnic_adapter *adapter)
 {
 	struct ibmvnic_rx_pool *rx_pool;
@@ -4825,6 +4863,8 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
 		} else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
 			dev_info(dev, "Backing device failover detected\n");
 			adapter->failover_pending = true;
+		} else if (gen_crq->cmd == IBMVNIC_DEVICE_DISABLE) {
+			ibmvnic_disable(adapter);
 		} else {
 			/* The adapter lost the connection */
 			dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index b21092f5f9c1..d15866cbc2a6 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -834,10 +834,11 @@ enum ibmvnic_crq_type {
 	IBMVNIC_CRQ_XPORT_EVENT		= 0xFF,
 };
 
-enum ibmvfc_crq_format {
+enum ibmvnic_crq_format {
 	IBMVNIC_CRQ_INIT                 = 0x01,
 	IBMVNIC_CRQ_INIT_COMPLETE        = 0x02,
 	IBMVNIC_PARTITION_MIGRATED       = 0x06,
+	IBMVNIC_DEVICE_DISABLE		 = 0x07,
 	IBMVNIC_DEVICE_FAILOVER          = 0x08,
 };
 
-- 
2.26.2