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authorFlorian Fainelli <f.fainelli@gmail.com>2017-11-10 22:33:25 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-11 15:55:15 +0300
commit4d215ae730786f51b108873227c67dc7815dbdef (patch)
tree222c0914e1065ca37fb58bbce5843e2814cdafb5 /drivers/net/ethernet/broadcom
parentf444ef510350c262a0532b95592df9e3899053e3 (diff)
downloadlinux-4d215ae730786f51b108873227c67dc7815dbdef.tar.xz
net: bgmac: Pad packets to a minimum size
In preparation for enabling Broadcom tags with b53, pad packets to a minimum size of 64 bytes (sans FCS) in order for the Broadcom switch to accept ingressing frames. Without this, we would typically be able to DHCP, but not resolve with ARP because packets are too small and get rejected by the switch. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom')
-rw-r--r--drivers/net/ethernet/broadcom/bgmac.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 48d672b204a4..1d96cd594ade 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -15,6 +15,7 @@
#include <linux/bcm47xx_nvram.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
+#include <net/dsa.h>
#include "bgmac.h"
static bool bgmac_wait_value(struct bgmac *bgmac, u16 reg, u32 mask,
@@ -127,6 +128,8 @@ bgmac_dma_tx_add_buf(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
dma_desc->ctl1 = cpu_to_le32(ctl1);
}
+#define ENET_BRCM_TAG_LEN 4
+
static netdev_tx_t bgmac_dma_tx_add(struct bgmac *bgmac,
struct bgmac_dma_ring *ring,
struct sk_buff *skb)
@@ -139,6 +142,18 @@ static netdev_tx_t bgmac_dma_tx_add(struct bgmac *bgmac,
u32 flags;
int i;
+ /* The Ethernet switch we are interfaced with needs packets to be at
+ * least 64 bytes (including FCS) otherwise they will be discarded when
+ * they enter the switch port logic. When Broadcom tags are enabled, we
+ * need to make sure that packets are at least 68 bytes
+ * (including FCS and tag) because the length verification is done after
+ * the Broadcom tag is stripped off the ingress packet.
+ */
+ if (netdev_uses_dsa(net_dev)) {
+ if (skb_put_padto(skb, ETH_ZLEN + ENET_BRCM_TAG_LEN))
+ goto err_stats;
+ }
+
if (skb->len > BGMAC_DESC_CTL1_LEN) {
netdev_err(bgmac->net_dev, "Too long skb (%d)\n", skb->len);
goto err_drop;
@@ -225,6 +240,7 @@ err_dma_head:
err_drop:
dev_kfree_skb(skb);
+err_stats:
net_dev->stats.tx_dropped++;
net_dev->stats.tx_errors++;
return NETDEV_TX_OK;