[PATCH net 6/8] net: stmmac: RX buffer size must be 16 byte aligned

From: Jose Abreu
Date: Tue Dec 10 2019 - 14:34:53 EST


We need to align the RX buffer size to at least 16 byte so that IP
doesn't mis-behave. This is required by HW.

Signed-off-by: Jose Abreu <Jose.Abreu@xxxxxxxxxxxx>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8c191e4d35d0..eb31d7fb321c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -46,7 +46,7 @@
#include "dwxgmac2.h"
#include "hwif.h"

-#define STMMAC_ALIGN(x) __ALIGN_KERNEL(x, SMP_CACHE_BYTES)
+#define STMMAC_ALIGN(x) ALIGN_DOWN(ALIGN_DOWN(x, SMP_CACHE_BYTES), 16)
#define TSO_MAX_BUFF_SIZE (SZ_16K - 1)

/* Module parameters */
--
2.7.4