diff options
| author | Florian Westphal <fw@strlen.de> | 2015-01-07 10:49:49 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-01-08 19:50:52 -0800 |
| commit | 0bec3b700d106a8b0a34227b2976d1a582f1aab7 (patch) | |
| tree | c6e6a28720a3640143d87e9f0fb6ebe340da00c2 /drivers/net/ethernet/realtek/r8169.c | |
| parent | 4a71d0548c9d51384977e986dff2c6f8395d8283 (diff) | |
r8169: add support for xmit_more
Delay update of hw tail descriptor if we know that another skb is going
to be sent.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/realtek/r8169.c')
| -rw-r--r-- | drivers/net/ethernet/realtek/r8169.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c index 14a1c5cec3a5..3a280598a15a 100644 --- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -7049,6 +7049,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb, u32 status, len; u32 opts[2]; int frags; + bool stop_queue; if (unlikely(!TX_FRAGS_READY_FOR(tp, skb_shinfo(skb)->nr_frags))) { netif_err(tp, drv, dev, "BUG! Tx Ring full when queue awake!\n"); @@ -7105,11 +7106,16 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb, tp->cur_tx += frags + 1; - RTL_W8(TxPoll, NPQ); + stop_queue = !TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS); - mmiowb(); + if (!skb->xmit_more || stop_queue || + netif_xmit_stopped(netdev_get_tx_queue(dev, 0))) { + RTL_W8(TxPoll, NPQ); + + mmiowb(); + } - if (!TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS)) { + if (stop_queue) { /* Avoid wrongly optimistic queue wake-up: rtl_tx thread must * not miss a ring update when it notices a stopped queue. */ |