From 9b0f7711d92bf44b727751a87373089a92031918 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Mon, 10 Apr 2017 11:15:19 +1000 Subject: [PATCH] ftgmac100: Pad small frames properly Rather than just transmitting garbage past the end of the small packet. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: David S. Miller --- drivers/net/ethernet/faraday/ftgmac100.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index c8162d21c142..6325e326147d 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -632,11 +632,17 @@ static void ftgmac100_tx_complete(struct ftgmac100 *priv) static int ftgmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev) { - unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; struct ftgmac100 *priv = netdev_priv(netdev); struct ftgmac100_txdes *txdes; dma_addr_t map; + /* The HW doesn't pad small frames */ + if (eth_skb_pad(skb)) { + netdev->stats.tx_dropped++; + return NETDEV_TX_OK; + } + + /* Reject oversize packets */ if (unlikely(skb->len > MAX_PKT_SIZE)) { if (net_ratelimit()) netdev_dbg(netdev, "tx packet too big\n"); @@ -657,7 +663,7 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb, /* setup TX descriptor */ ftgmac100_txdes_set_skb(txdes, skb); ftgmac100_txdes_set_dma_addr(txdes, map); - ftgmac100_txdes_set_buffer_size(txdes, len); + ftgmac100_txdes_set_buffer_size(txdes, skb->len); ftgmac100_txdes_set_first_segment(txdes); ftgmac100_txdes_set_last_segment(txdes); -- 2.30.2