ixgbe: return integer from ixgbe_acquire_msix_vectors

Similar to how ixgbevf handles acquiring MSI-X vectors, we can return an
error code instead of relying on the flag being set. This makes it more
clear that we have failed to setup MSI-X mode, and also will make it
easier to consolidate MSI-X related code all into the single function.

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>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
index 5d085d5..2a38894 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c
@@ -696,8 +696,8 @@ static void ixgbe_set_num_queues(struct ixgbe_adapter *adapter)
        ixgbe_set_rss_queues(adapter);
 }
 
-static void ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter,
-                                      int vectors)
+static int ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter,
+                                     int vectors)
 {
        int vector_threshold;
 
@@ -726,16 +726,22 @@ static void ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter,
                adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED;
                kfree(adapter->msix_entries);
                adapter->msix_entries = NULL;
-       } else {
-               adapter->flags |= IXGBE_FLAG_MSIX_ENABLED; /* Woot! */
-               /*
-                * Adjust for only the vectors we'll use, which is minimum
-                * of max_msix_q_vectors + NON_Q_VECTORS, or the number of
-                * vectors we were allocated.
-                */
-               vectors -= NON_Q_VECTORS;
-               adapter->num_q_vectors = min(vectors, adapter->max_q_vectors);
+
+               return vectors;
        }
+
+       /* we successfully allocated some number of vectors within our
+        * requested range.
+        */
+       adapter->flags |= IXGBE_FLAG_MSIX_ENABLED;
+
+       /* Adjust for only the vectors we'll use, which is minimum
+        * of max_q_vectors, or the number of vectors we were allocated.
+        */
+       vectors -= NON_Q_VECTORS;
+       adapter->num_q_vectors = min_t(int, vectors, adapter->max_q_vectors);
+
+       return 0;
 }
 
 static void ixgbe_add_ring(struct ixgbe_ring *ring,
@@ -1085,9 +1091,7 @@ static void ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
                for (vector = 0; vector < v_budget; vector++)
                        adapter->msix_entries[vector].entry = vector;
 
-               ixgbe_acquire_msix_vectors(adapter, v_budget);
-
-               if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED)
+               if (!ixgbe_acquire_msix_vectors(adapter, v_budget))
                        return;
        }