net: designware: Pad small packets

Make sure that we pad small packets to a minimum length of 60 bytes
(without FCS). This is necessary to interface with Ethernet switches
that will reject RUNT frames unless padded correctly.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index 9207324731e5c2c38d6ac5d14e5498511c0833dd..6d5307128d866ca23f9e9fbbc0f8945aa12f0460 100644 (file)
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -18,6 +18,7 @@
 #include <pci.h>
 #include <linux/compiler.h>
 #include <linux/err.h>
+#include <linux/kernel.h>
 #include <asm/io.h>
 #include <power/regulator.h>
 #include "designware.h"
@@ -344,6 +345,8 @@ int designware_eth_enable(struct dw_eth_dev *priv)
        return 0;
 }
 
+#define ETH_ZLEN       60
+
 static int _dw_eth_send(struct dw_eth_dev *priv, void *packet, int length)
 {
        struct eth_dma_regs *dma_p = priv->dma_regs_p;
@@ -370,6 +373,8 @@ static int _dw_eth_send(struct dw_eth_dev *priv, void *packet, int length)
                return -EPERM;
        }
 
+       length = max(length, ETH_ZLEN);
+
        memcpy((void *)data_start, packet, length);
 
        /* Flush data to be sent */