igb: Move the calls to set the Tx and Rx queues into igb_open
This change helps to address locking issues seen with
netif_set_real_num_tx_queues and netif_set_real_num_rx_queues when used in
the igb_set_interrupt_capability function. To resolve these locking issues
I have moved the two function calls into __igb_open so that they can be
called while the RTNL lock is held.
An added advantage to this is that the number of queues is not updated
until the last possible moment so if there are any issues in allocating
MSI-X interrupts or resources for the rings we have time to change the
values prior to updating the netdev.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 4a25b8fa..e7b1027 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -948,7 +948,7 @@
* Attempt to configure interrupts using the best available
* capabilities of the hardware and kernel.
**/
-static int igb_set_interrupt_capability(struct igb_adapter *adapter)
+static void igb_set_interrupt_capability(struct igb_adapter *adapter)
{
int err;
int numvecs, i;
@@ -985,7 +985,7 @@
adapter->msix_entries,
numvecs);
if (err == 0)
- goto out;
+ return;
igb_reset_interrupt_capability(adapter);
@@ -1015,14 +1015,6 @@
adapter->num_q_vectors = 1;
if (!pci_enable_msi(adapter->pdev))
adapter->flags |= IGB_FLAG_HAS_MSI;
-out:
- /* Notify the stack of the (possibly) reduced queue counts. */
- rtnl_lock();
- netif_set_real_num_tx_queues(adapter->netdev, adapter->num_tx_queues);
- err = netif_set_real_num_rx_queues(adapter->netdev,
- adapter->num_rx_queues);
- rtnl_unlock();
- return err;
}
static void igb_add_ring(struct igb_ring *ring,
@@ -1212,9 +1204,7 @@
struct pci_dev *pdev = adapter->pdev;
int err;
- err = igb_set_interrupt_capability(adapter);
- if (err)
- return err;
+ igb_set_interrupt_capability(adapter);
err = igb_alloc_q_vectors(adapter);
if (err) {
@@ -2543,6 +2533,17 @@
if (err)
goto err_req_irq;
+ /* Notify the stack of the actual queue counts. */
+ err = netif_set_real_num_tx_queues(adapter->netdev,
+ adapter->num_tx_queues);
+ if (err)
+ goto err_set_queues;
+
+ err = netif_set_real_num_rx_queues(adapter->netdev,
+ adapter->num_rx_queues);
+ if (err)
+ goto err_set_queues;
+
/* From here on the code is the same as igb_up() */
clear_bit(__IGB_DOWN, &adapter->state);
@@ -2572,6 +2573,8 @@
return 0;
+err_set_queues:
+ igb_free_irq(adapter);
err_req_irq:
igb_release_hw_control(adapter);
igb_power_down_link(adapter);
@@ -6841,7 +6844,9 @@
wr32(E1000_WUS, ~0);
if (netdev->flags & IFF_UP) {
+ rtnl_lock();
err = __igb_open(netdev, true);
+ rtnl_unlock();
if (err)
return err;
}