ibmvnic: Reset sub-crqs during driver reset

When the ibmvnic driver is resetting, we can just reset the sub crqs
instead of releasing all of their resources and re-allocting them.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 43 insertions, 3 deletions

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 5661a043f5e5..8dcf58088178 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1320,8 +1320,6 @@ static int do_reset(struct ibmvnic_adapter *adapter,
                  */
                 adapter->state = VNIC_PROBED;
 
-                release_sub_crqs(adapter);
-
                 rc = ibmvnic_init(adapter);
                 if (rc)
                         return 0;
@@ -1728,6 +1726,45 @@ static const struct ethtool_ops ibmvnic_ethtool_ops = {
 
 /* Routines for managing CRQs/sCRQs  */
 
+static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
+                                   struct ibmvnic_sub_crq_queue *scrq)
+{
+        int rc;
+
+        if (scrq->irq) {
+                free_irq(scrq->irq, scrq);
+                irq_dispose_mapping(scrq->irq);
+                scrq->irq = 0;
+        }
+
+        memset(scrq->msgs, 0, 2 * PAGE_SIZE);
+        scrq->cur = 0;
+
+        rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
+                           4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
+        return rc;
+}
+
+static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
+{
+        int i, rc;
+
+        for (i = 0; i < adapter->req_tx_queues; i++) {
+                rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
+                if (rc)
+                        return rc;
+        }
+
+        for (i = 0; i < adapter->req_rx_queues; i++) {
+                rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
+                if (rc)
+                        return rc;
+        }
+
+        rc = init_sub_crq_irqs(adapter);
+        return rc;
+}
+
 static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
                                   struct ibmvnic_sub_crq_queue *scrq)
 {
@@ -3607,7 +3644,10 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
                 return -1;
         }
 
-        rc = init_sub_crqs(adapter);
+        if (adapter->resetting)
+                rc = reset_sub_crq_queues(adapter);
+        else
+                rc = init_sub_crqs(adapter);
         if (rc) {
                 dev_err(dev, "Initialization of sub crqs failed\n");
                 release_crq_queue(adapter);