fm10k: Reduce buffer size when pages are larger than 4K

This change reduces the buffer size to 2K for all page sizes.  The basic
idea is that since most frames only have a 1500 MTU supporting a buffer
size larger than this is somewhat wasteful.  As such I have reduced the
size to 2K for all page sizes which will allow for more uses per page.
Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/fm10k/fm10k.h

@@ -47,13 +47,9 @@
 #define FM10K_DEFAULT_TX_WORK	 256
 
 #define FM10K_RXBUFFER_256	  256
-#define FM10K_RXBUFFER_16384	16384
 #define FM10K_RX_HDR_LEN	FM10K_RXBUFFER_256
-#if PAGE_SIZE <= FM10K_RXBUFFER_16384
-#define FM10K_RX_BUFSZ		(PAGE_SIZE / 2)
-#else
-#define FM10K_RX_BUFSZ		FM10K_RXBUFFER_16384
-#endif
+#define FM10K_RXBUFFER_2048	 2048
+#define FM10K_RX_BUFSZ		FM10K_RXBUFFER_2048
 
 /* How many Rx Buffers do we bundle into one write to the hardware ? */
 #define FM10K_RX_BUFFER_WRITE	16	/* Must be power of 2 */