korina: reset resource buffer size to 1536

The new value is the one used in the external patch before and allows at
least a standard MTU of 1500 to be handled correctly. Impact of this
change gets visible when bigger packets are to be received, issuing:
| ping -s 492 <IP>
and bigger payload sized led to 100% packet loss.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Acked-by: Florian Fainelli <florian@openwrt.org
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/korina.c b/drivers/net/korina.c
index fefb33db79a3..e30c2f437d19 100644
--- a/drivers/net/korina.c
+++ b/drivers/net/korina.c
@@ -84,7 +84,10 @@
 #define KORINA_NUM_RDS  64  /* number of receive descriptors */
 #define KORINA_NUM_TDS  64  /* number of transmit descriptors */
 
-#define KORINA_RBSIZE   536 /* size of one resource buffer = Ether MTU */
+/* KORINA_RBSIZE is the hardware's default maximum receive
+ * frame size in bytes. Having this hardcoded means that there
+ * is no support for MTU sizes greater than 1500. */
+#define KORINA_RBSIZE   1536 /* size of one resource buffer = Ether MTU */
 #define KORINA_RDS_MASK (KORINA_NUM_RDS - 1)
 #define KORINA_TDS_MASK (KORINA_NUM_TDS - 1)
 #define RD_RING_SIZE    (KORINA_NUM_RDS * sizeof(struct dma_desc))