enic: Replace hardcoded values for vnic descriptor by defines

Replace the hardcoded values used in the calculations for
vnic descriptors and rings with defines. Minor code cleanup.
Signed-off-by: Satish Kharat <satishkh@cisco.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cisco/enic/vnic_dev.c

@@ -146,23 +146,19 @@ EXPORT_SYMBOL(vnic_dev_get_res);
 static unsigned int vnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
 	unsigned int desc_count, unsigned int desc_size)
 {
-	/* The base address of the desc rings must be 512 byte aligned.
-	 * Descriptor count is aligned to groups of 32 descriptors.  A
-	 * count of 0 means the maximum 4096 descriptors.  Descriptor
-	 * size is aligned to 16 bytes.
-	 */
-
-	unsigned int count_align = 32;
-	unsigned int desc_align = 16;
 
-	ring->base_align = 512;
+	/* Descriptor ring base address alignment in bytes*/
+	ring->base_align = VNIC_DESC_BASE_ALIGN;
 
+	/* A count of 0 means the maximum descriptors */
 	if (desc_count == 0)
-		desc_count = 4096;
+		desc_count = VNIC_DESC_MAX_COUNT;
 
-	ring->desc_count = ALIGN(desc_count, count_align);
+	/* Descriptor count aligned in groups of VNIC_DESC_COUNT_ALIGN descriptors */
+	ring->desc_count = ALIGN(desc_count, VNIC_DESC_COUNT_ALIGN);
 
-	ring->desc_size = ALIGN(desc_size, desc_align);
+	/* Descriptor size alignment in bytes */
+	ring->desc_size = ALIGN(desc_size, VNIC_DESC_SIZE_ALIGN);
 
 	ring->size = ring->desc_count * ring->desc_size;
 	ring->size_unaligned = ring->size + ring->base_align;

drivers/net/ethernet/cisco/enic/vnic_dev.h

@@ -31,6 +31,11 @@ static inline void writeq(u64 val, void __iomem *reg)
 #undef pr_fmt
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#define VNIC_DESC_SIZE_ALIGN	16
+#define VNIC_DESC_COUNT_ALIGN	32
+#define VNIC_DESC_BASE_ALIGN	512
+#define VNIC_DESC_MAX_COUNT	4096
+
 enum vnic_dev_intr_mode {
 	VNIC_DEV_INTR_MODE_UNKNOWN,
 	VNIC_DEV_INTR_MODE_INTX,