tg3: Raise the jumbo frame BD flag threshold

The current transmit routines set the jumbo frame BD flag too
aggressively.  This can reduce performance for common cases.  This patch
raises the jumbo flag threshold to 1518, up from 1500.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index afb79db5327eeab0b9d9e9e787d8c09d23d0a28a..b8ae5e19ced5883800bb84072f983963258fcafd 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -5761,7 +5761,7 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb,
        dma_unmap_addr_set(&tnapi->tx_buffers[entry], mapping, mapping);
 
        if ((tp->tg3_flags3 & TG3_FLG3_USE_JUMBO_BDFLAG) &&
-           !mss && skb->len > ETH_DATA_LEN)
+           !mss && skb->len > VLAN_ETH_FRAME_LEN)
                base_flags |= TXD_FLAG_JMB_PKT;
 
        tg3_set_txd(tnapi, entry, mapping, len, base_flags,
@@ -5995,7 +5995,7 @@ static netdev_tx_t tg3_start_xmit_dma_bug(struct sk_buff *skb,
 #endif
 
        if ((tp->tg3_flags3 & TG3_FLG3_USE_JUMBO_BDFLAG) &&
-           !mss && skb->len > ETH_DATA_LEN)
+           !mss && skb->len > VLAN_ETH_FRAME_LEN)
                base_flags |= TXD_FLAG_JMB_PKT;
 
        len = skb_headlen(skb);