ixgbe: fix ring reallocation in ethtool

changing ring sizes in ethtool needs to be robust.  If an allocation fails the
driver must continue operation, with the previous settings.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index 71ddac6..27db64f 100644 (file)
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -336,5 +336,9 @@ extern int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
                                    struct ixgbe_ring *rxdr);
 extern int ixgbe_setup_tx_resources(struct ixgbe_adapter *adapter,
                                    struct ixgbe_ring *txdr);
+extern void ixgbe_free_rx_resources(struct ixgbe_adapter *adapter,
+                                    struct ixgbe_ring *rxdr);
+extern void ixgbe_free_tx_resources(struct ixgbe_adapter *adapter,
+                                    struct ixgbe_ring *txdr);
 
 #endif /* _IXGBE_H_ */

diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index f18e3da..928b97c 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -654,12 +654,9 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
                               struct ethtool_ringparam *ring)
 {
        struct ixgbe_adapter *adapter = netdev_priv(netdev);
-       struct ixgbe_tx_buffer *old_buf;
-       struct ixgbe_rx_buffer *old_rx_buf;
-       void *old_desc;
+       struct ixgbe_ring *temp_ring;
        int i, err;
-       u32 new_rx_count, new_tx_count, old_size;
-       dma_addr_t old_dma;
+       u32 new_rx_count, new_tx_count;
 
        if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
                return -EINVAL;
@@ -678,6 +675,15 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
                return 0;
        }
 
+       if (adapter->num_tx_queues > adapter->num_rx_queues)
+               temp_ring = vmalloc(adapter->num_tx_queues *
+                                   sizeof(struct ixgbe_ring));
+       else
+               temp_ring = vmalloc(adapter->num_rx_queues *
+                                   sizeof(struct ixgbe_ring));
+       if (!temp_ring)
+               return -ENOMEM;
+
        while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
                msleep(1);
 
@@ -690,66 +696,59 @@ static int ixgbe_set_ringparam(struct net_device *netdev,
         * to the tx and rx ring structs.
         */
        if (new_tx_count != adapter->tx_ring->count) {
+               memcpy(temp_ring, adapter->tx_ring,
+                      adapter->num_tx_queues * sizeof(struct ixgbe_ring));
+
                for (i = 0; i < adapter->num_tx_queues; i++) {
-                       /* Save existing descriptor ring */
-                       old_buf = adapter->tx_ring[i].tx_buffer_info;
-                       old_desc = adapter->tx_ring[i].desc;
-                       old_size = adapter->tx_ring[i].size;
-                       old_dma = adapter->tx_ring[i].dma;
-                       /* Try to allocate a new one */
-                       adapter->tx_ring[i].tx_buffer_info = NULL;
-                       adapter->tx_ring[i].desc = NULL;
-                       adapter->tx_ring[i].count = new_tx_count;
-                       err = ixgbe_setup_tx_resources(adapter,
-                                                      &adapter->tx_ring[i]);
+                       temp_ring[i].count = new_tx_count;
+                       err = ixgbe_setup_tx_resources(adapter, &temp_ring[i]);
                        if (err) {
-                               /* Restore the old one so at least
-                                  the adapter still works, even if
-                                  we failed the request */
-                               adapter->tx_ring[i].tx_buffer_info = old_buf;
-                               adapter->tx_ring[i].desc = old_desc;
-                               adapter->tx_ring[i].size = old_size;
-                               adapter->tx_ring[i].dma = old_dma;
+                               while (i) {
+                                       i--;
+                                       ixgbe_free_tx_resources(adapter, &temp_ring[i]);
+                               }
                                goto err_setup;
                        }
-                       /* Free the old buffer manually */
-                       vfree(old_buf);
-                       pci_free_consistent(adapter->pdev, old_size,
-                                           old_desc, old_dma);
                }
+
+               for (i = 0; i < adapter->num_tx_queues; i++)
+                       ixgbe_free_tx_resources(adapter, &adapter->tx_ring[i]);
+
+               memcpy(adapter->tx_ring, temp_ring,
+                      adapter->num_tx_queues * sizeof(struct ixgbe_ring));
+
+               adapter->tx_ring_count = new_tx_count;
        }
 
        if (new_rx_count != adapter->rx_ring->count) {
-               for (i = 0; i < adapter->num_rx_queues; i++) {
+               memcpy(temp_ring, adapter->rx_ring,
+                      adapter->num_rx_queues * sizeof(struct ixgbe_ring));
 
-                       old_rx_buf = adapter->rx_ring[i].rx_buffer_info;
-                       old_desc = adapter->rx_ring[i].desc;
-                       old_size = adapter->rx_ring[i].size;
-                       old_dma = adapter->rx_ring[i].dma;
-
-                       adapter->rx_ring[i].rx_buffer_info = NULL;
-                       adapter->rx_ring[i].desc = NULL;
-                       adapter->rx_ring[i].dma = 0;
-                       adapter->rx_ring[i].count = new_rx_count;
-                       err = ixgbe_setup_rx_resources(adapter,
-                                                      &adapter->rx_ring[i]);
+               for (i = 0; i < adapter->num_rx_queues; i++) {
+                       temp_ring[i].count = new_rx_count;
+                       err = ixgbe_setup_rx_resources(adapter, &temp_ring[i]);
                        if (err) {
-                               adapter->rx_ring[i].rx_buffer_info = old_rx_buf;
-                               adapter->rx_ring[i].desc = old_desc;
-                               adapter->rx_ring[i].size = old_size;
-                               adapter->rx_ring[i].dma = old_dma;
+                               while (i) {
+                                       i--;
+                                       ixgbe_free_rx_resources(adapter, &temp_ring[i]);
+                               }
                                goto err_setup;
                        }
-
-                       vfree(old_rx_buf);
-                       pci_free_consistent(adapter->pdev, old_size, old_desc,
-                                           old_dma);
                }
+
+               for (i = 0; i < adapter->num_rx_queues; i++)
+                       ixgbe_free_rx_resources(adapter, &adapter->rx_ring[i]);
+
+               memcpy(adapter->rx_ring, temp_ring,
+                      adapter->num_rx_queues * sizeof(struct ixgbe_ring));
+
+               adapter->rx_ring_count = new_rx_count;
        }
 
+       /* success! */
        err = 0;
 err_setup:
-       if (netif_running(adapter->netdev))
+       if (netif_running(netdev))
                ixgbe_up(adapter);
 
        clear_bit(__IXGBE_RESETTING, &adapter->state);

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 3b0481a..cde5d5a 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2731,8 +2731,8 @@ alloc_failed:
  *
  * Free all transmit software resources
  **/
-static void ixgbe_free_tx_resources(struct ixgbe_adapter *adapter,
-                                    struct ixgbe_ring *tx_ring)
+void ixgbe_free_tx_resources(struct ixgbe_adapter *adapter,
+                             struct ixgbe_ring *tx_ring)
 {
        struct pci_dev *pdev = adapter->pdev;
 
@@ -2761,14 +2761,14 @@ static void ixgbe_free_all_tx_resources(struct ixgbe_adapter *adapter)
 }
 
 /**
- * ixgbe_free_rx_resources - Free Rx Resources
+ * ixgbe_ree_rx_resources - Free Rx Resources
  * @adapter: board private structure
  * @rx_ring: ring to clean the resources from
  *
  * Free all receive software resources
  **/
-static void ixgbe_free_rx_resources(struct ixgbe_adapter *adapter,
-                                   struct ixgbe_ring *rx_ring)
+void ixgbe_free_rx_resources(struct ixgbe_adapter *adapter,
+                             struct ixgbe_ring *rx_ring)
 {
        struct pci_dev *pdev = adapter->pdev;