From ebcbc2d2715cdc5b1e37c652cfc73ea05a70b8b2 Mon Sep 17 00:00:00 2001 From: Tushar Dave Date: Fri, 14 Sep 2012 02:21:37 +0000 Subject: [PATCH] e1000e: Minimum packet size must be 17 bytes This is a HW requirement. Although a buffer as short as 1 byte is allowed, the total length of packet before, padding and CRC insertion, must be at least 17 bytes. So pad all small packets manually up to 17 bytes before delivering them to HW. Signed-off-by: Tushar Dave Tested-by: Jeff Pieper Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000e/netdev.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index f444eb0b76d8d..dadb13be479af 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -5067,6 +5067,17 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb, return NETDEV_TX_OK; } + /* + * The minimum packet size with TCTL.PSP set is 17 bytes so + * pad skb in order to meet this minimum size requirement + */ + if (unlikely(skb->len < 17)) { + if (skb_pad(skb, 17 - skb->len)) + return NETDEV_TX_OK; + skb->len = 17; + skb_set_tail_pointer(skb, 17); + } + mss = skb_shinfo(skb)->gso_size; if (mss) { u8 hdr_len; -- 2.39.5