ixgbe: add comment noting recalculation of queues

Since we previously called ixgbe_set_num_queues just prior to attempting
to set our interrupt scheme, it may be non obvious why we have to call
it again inside the function. Add a comment which helps make it more
obvious that we are resetting features based on the fact that we do not
have MSI-X enabled, and cannot use the previous settings.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
index 2d9451e39686..ae36fd61a3aa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
@@ -1086,6 +1086,11 @@ static void ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
                         return;
         }
 
+        /* At this point, we do not have MSI-X capabilities. We need to
+         * reconfigure or disable various features which require MSI-X
+         * capability.
+         */
+
         /* disable DCB if number of TCs exceeds 1 */
         if (netdev_get_num_tc(adapter->netdev) > 1) {
                 e_err(probe, "num TCs exceeds number of queues - disabling DCB\n");
@@ -1107,6 +1112,9 @@ static void ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
         /* disable RSS */
         adapter->ring_feature[RING_F_RSS].limit = 1;
 
+        /* recalculate number of queues now that many features have been
+         * changed or disabled.
+         */
         ixgbe_set_num_queues(adapter);
         adapter->num_q_vectors = 1;