sfc: Fix descriptor cache sizes

These were accidentally undersized by a factor of 2, which limited
performance.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
index 41a321b0e8c651afe115ae65db3975ccad1db91b..7b19686218a586f5f0c949964af3f27d6c636ba1 100644 (file)
--- a/drivers/net/sfc/falcon.c
+++ b/drivers/net/sfc/falcon.c
@@ -49,11 +49,11 @@ static int disable_dma_stats;
  * goes idle.
  */
 #define TX_DC_ENTRIES 16
-#define TX_DC_ENTRIES_ORDER 0
+#define TX_DC_ENTRIES_ORDER 1
 #define TX_DC_BASE 0x130000
 
 #define RX_DC_ENTRIES 64
-#define RX_DC_ENTRIES_ORDER 2
+#define RX_DC_ENTRIES_ORDER 3
 #define RX_DC_BASE 0x100000
 
 static const unsigned int
@@ -2974,14 +2974,14 @@ int falcon_init_nic(struct efx_nic *efx)
        efx_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG);
 
        /* Set TX descriptor cache size. */
-       BUILD_BUG_ON(TX_DC_ENTRIES != (16 << TX_DC_ENTRIES_ORDER));
+       BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER));
        EFX_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
        efx_writeo(efx, &temp, FR_AZ_TX_DC_CFG);
 
        /* Set RX descriptor cache size.  Set low watermark to size-8, as
         * this allows most efficient prefetching.
         */
-       BUILD_BUG_ON(RX_DC_ENTRIES != (16 << RX_DC_ENTRIES_ORDER));
+       BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER));
        EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
        efx_writeo(efx, &temp, FR_AZ_RX_DC_CFG);
        EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8);