[PATCH net-next 07/11] ibmvnic: Deactivate RX pool buffer replenishment on H_CLOSED

[Nathan Fontenot]

From: Thomas Falcon <tlfal...@linux.vnet.ibm.com>

If H_CLOSED is returned, halt RX buffer replenishment activity
until firmware sends a notification that the driver can reset.

Signed-off-by: Thomas Falcon <tlfal...@linux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c 
b/drivers/net/ethernet/ibm/ibmvnic.c
index 1c3f1ed..47421e4 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -200,6 +200,15 @@ static void free_long_term_buff(struct ibmvnic_adapter 
*adapter,
        dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 }
 
+static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
+{
+       int i;
+
+       for (i = 0; i < be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
+            i++)
+               adapter->rx_pool[i].active = 0;
+}
+
 static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
                              struct ibmvnic_rx_pool *pool)
 {
@@ -217,6 +226,9 @@ static void replenish_rx_pool(struct ibmvnic_adapter 
*adapter,
        int index;
        int i;
 
+       if (!pool->active)
+               return;
+
        handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
                                      be32_to_cpu(adapter->login_rsp_buf->
                                      off_rxadd_subcrqs));
@@ -287,6 +299,15 @@ static void replenish_rx_pool(struct ibmvnic_adapter 
*adapter,
        dev_kfree_skb_any(skb);
        adapter->replenish_add_buff_failure++;
        atomic_add(buffers_added, &pool->available);
+
+       if (lpar_rc == H_CLOSED) {
+               /* Disable buffer pool replenishment and report carrier off if
+                * queue is closed. Firmware guarantees that a signal will
+                * be sent to the driver, triggering a reset.
+                */
+               deactivate_rx_pools(adapter);
+               netif_carrier_off(adapter->netdev);
+       }
 }
 
 static void replenish_pools(struct ibmvnic_adapter *adapter)