bnxt_en: Set up the chip specific RSS table size.

Currently, we allocate one page for the hardware DMA RSS indirection
table.  While the size is currently big enough for all chips, future
chip variations may support bigger sizes, so it is better to calculate
and store the chip specific size and allocate accordingly.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -3538,7 +3538,7 @@ static void bnxt_free_vnic_attributes(struct bnxt *bp)
 		}
 
 		if (vnic->rss_table) {
-			dma_free_coherent(&pdev->dev, PAGE_SIZE,
+			dma_free_coherent(&pdev->dev, vnic->rss_table_size,
 					  vnic->rss_table,
 					  vnic->rss_table_dma_addr);
 			vnic->rss_table = NULL;
@@ -3603,7 +3603,13 @@ static int bnxt_alloc_vnic_attributes(struct bnxt *bp)
 			continue;
 
 		/* Allocate rss table and hash key */
-		vnic->rss_table = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
+		size = L1_CACHE_ALIGN(HW_HASH_INDEX_SIZE * sizeof(u16));
+		if (bp->flags & BNXT_FLAG_CHIP_P5)
+			size = L1_CACHE_ALIGN(BNXT_MAX_RSS_TABLE_SIZE_P5);
+
+		vnic->rss_table_size = size + HW_HASH_KEY_SIZE;
+		vnic->rss_table = dma_alloc_coherent(&pdev->dev,
+						     vnic->rss_table_size,
 						     &vnic->rss_table_dma_addr,
 						     GFP_KERNEL);
 		if (!vnic->rss_table) {
@@ -3611,8 +3617,6 @@ static int bnxt_alloc_vnic_attributes(struct bnxt *bp)
 			goto out;
 		}
 
-		size = L1_CACHE_ALIGN(HW_HASH_INDEX_SIZE * sizeof(u16));
-
 		vnic->rss_hash_key = ((void *)vnic->rss_table) + size;
 		vnic->rss_hash_key_dma_addr = vnic->rss_table_dma_addr + size;
 	}

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1017,6 +1017,13 @@ struct bnxt_vnic_info {
 	__le16		*rss_table;
 	dma_addr_t	rss_hash_key_dma_addr;
 	u64		*rss_hash_key;
+	int		rss_table_size;
+#define BNXT_RSS_TABLE_ENTRIES_P5	64
+#define BNXT_RSS_TABLE_SIZE_P5		(BNXT_RSS_TABLE_ENTRIES_P5 * 4)
+#define BNXT_RSS_TABLE_MAX_TBL_P5	8
+#define BNXT_MAX_RSS_TABLE_SIZE_P5				\
+	(BNXT_RSS_TABLE_SIZE_P5 * BNXT_RSS_TABLE_MAX_TBL_P5)
+
 	u32		rx_mask;
 
 	u8		*mc_list;