ibmvnic: Halt TX and report carrier off on H_CLOSED return code

This patch disables transmissions and reports carrier off if xmit
function returns that the hardware TX queue is closed. The driver can
then await a signal from firmware to determine the correct reset method.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index def867aaa422..1c3f1edea9db 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1111,8 +1111,14 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
                 dev_kfree_skb_any(skb);
                 tx_buff->skb = NULL;
 
-                if (lpar_rc == H_CLOSED)
-                        netif_stop_subqueue(netdev, queue_num);
+                if (lpar_rc == H_CLOSED) {
+                        /* Disable TX and report carrier off if queue is closed.
+                         * Firmware guarantees that a signal will be sent to the
+                         * driver, triggering a reset or some other action.
+                         */
+                        netif_tx_stop_all_queues(netdev);
+                        netif_carrier_off(netdev);
+                }
 
                 tx_send_failed++;
                 tx_dropped++;