This reverts commit 2e6eedb4813e34d8d84ac0eb3afb668966f3f356. Sander reported a regression [1], therefore let's revert these commits. Removal of the barriers doesn't seem to contribute to the issue, the patch just overlaps with the problematic one and reverting "r8169: make use of xmit_more and __netdev_sent_queue" only wasn't tested.
[1] https://marc.info/?t=154965066400001&r=1&w=2 Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com> --- drivers/net/ethernet/realtek/r8169.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c index bba806ce57d3..6e36b88ca7c9 100644 --- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -6074,7 +6074,6 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb, struct device *d = tp_to_dev(tp); dma_addr_t mapping; u32 opts[2], len; - bool stop_queue; int frags; if (unlikely(!rtl_tx_slots_avail(tp, skb_shinfo(skb)->nr_frags))) { @@ -6116,6 +6115,8 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb, txd->opts2 = cpu_to_le32(opts[1]); + netdev_sent_queue(dev, skb->len); + skb_tx_timestamp(skb); /* Force memory writes to complete before releasing descriptor */ @@ -6128,16 +6129,16 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb, tp->cur_tx += frags + 1; - stop_queue = !rtl_tx_slots_avail(tp, MAX_SKB_FRAGS); - if (unlikely(stop_queue)) - netif_stop_queue(dev); + RTL_W8(tp, TxPoll, NPQ); - if (__netdev_sent_queue(dev, skb->len, skb->xmit_more)) { - RTL_W8(tp, TxPoll, NPQ); - mmiowb(); - } + mmiowb(); - if (unlikely(stop_queue)) { + if (!rtl_tx_slots_avail(tp, MAX_SKB_FRAGS)) { + /* Avoid wrongly optimistic queue wake-up: rtl_tx thread must + * not miss a ring update when it notices a stopped queue. + */ + smp_wmb(); + netif_stop_queue(dev); /* Sync with rtl_tx: * - publish queue status and cur_tx ring index (write barrier) * - refresh dirty_tx ring index (read barrier). -- 2.20.1
