igb: add vfs_allocated_count as placeholder for number of vfs

This is the first step in supporting sr-iov.  The vf_allocated_count value
will be 0 until we actually have vfs present.  In the meantime it
represents an offset value for the start of the queues.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index 49fc0daf45af..3d3e5f6cd313 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -57,8 +57,10 @@ struct igb_adapter;
 #define IGB_MIN_ITR_USECS                 10
 
 /* Transmit and receive queues */
-#define IGB_MAX_RX_QUEUES                  4
-#define IGB_MAX_TX_QUEUES                  4
+#define IGB_MAX_RX_QUEUES     (adapter->vfs_allocated_count ? \
+                               (adapter->vfs_allocated_count > 6 ? 1 : 2) : 4)
+#define IGB_MAX_TX_QUEUES     IGB_MAX_RX_QUEUES
+#define IGB_ABS_MAX_TX_QUEUES     4
 
 /* RX descriptor control thresholds.
  * PTHRESH - MAC will consider prefetch if it has fewer than this number of
@@ -267,9 +269,10 @@ struct igb_adapter {
         unsigned int flags;
         u32 eeprom_wol;
 
-        struct igb_ring *multi_tx_table[IGB_MAX_TX_QUEUES];
+        struct igb_ring *multi_tx_table[IGB_ABS_MAX_TX_QUEUES];
         unsigned int tx_ring_count;
         unsigned int rx_ring_count;
+        unsigned int vfs_allocated_count;
 };
 
 #define IGB_FLAG_HAS_MSI           (1 << 0)