From 82500aa01ad12eff41a9a68ad01f1d40db8921f9 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:04 +0200 Subject: net: mediatek: watchdog_timeo was not set The original commit failed to set watchdog_timeo. This patch sets watchdog_timeo to HZ. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index e0b68af..bb10d57 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1645,6 +1645,7 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np) mac->hw_stats->reg_offset = id * MTK_STAT_OFFSET; SET_NETDEV_DEV(eth->netdev[id], eth->dev); + eth->netdev[id]->watchdog_timeo = HZ; eth->netdev[id]->netdev_ops = &mtk_netdev_ops; eth->netdev[id]->base_addr = (unsigned long)eth->base; eth->netdev[id]->vlan_features = MTK_HW_FEATURES & -- cgit v0.10.2 From beeb4ca466fa1c399d69e34c30ddf04e0b7cbefd Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:05 +0200 Subject: net: mediatek: mtk_cal_txd_req() returns bad value The code used to also support the PDMA engine, which had 2 packet pointers per descriptor. Because of this we had to divide the result by 2 and round it up. This is no longer needed as the code only supports QDMA. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index bb10d57..94cceb8 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -681,7 +681,7 @@ static inline int mtk_cal_txd_req(struct sk_buff *skb) nfrags += skb_shinfo(skb)->nr_frags; } - return DIV_ROUND_UP(nfrags, 2); + return nfrags; } static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) -- cgit v0.10.2 From 13439eec7af24b0800e654ee03c57ab985083ae4 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:06 +0200 Subject: net: mediatek: remove superfluous reset call HW reset is triggered in the mtk_hw_init() function. There is no need to also reset the core during probe. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 94cceb8..a4982e4 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1679,10 +1679,6 @@ static int mtk_probe(struct platform_device *pdev) struct mtk_eth *eth; int err; - err = device_reset(&pdev->dev); - if (err) - return err; - match = of_match_device(of_mtk_match, &pdev->dev); soc = (struct mtk_soc_data *)match->data; -- cgit v0.10.2 From 13c822f6d468ca5a16da4d9432b067d54245c5b9 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:07 +0200 Subject: net: mediatek: fix stop and wakeup of queue The driver supports 2 MACs. Both run on the same DMA ring. If we go above/below the TX rings threshold value, we always need to wake/stop the queue of both devices. Not doing to can cause TX stalls and packet drops on one of the devices. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index a4982e4..4ebc42e 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -684,6 +684,28 @@ static inline int mtk_cal_txd_req(struct sk_buff *skb) return nfrags; } +static void mtk_wake_queue(struct mtk_eth *eth) +{ + int i; + + for (i = 0; i < MTK_MAC_COUNT; i++) { + if (!eth->netdev[i]) + continue; + netif_wake_queue(eth->netdev[i]); + } +} + +static void mtk_stop_queue(struct mtk_eth *eth) +{ + int i; + + for (i = 0; i < MTK_MAC_COUNT; i++) { + if (!eth->netdev[i]) + continue; + netif_stop_queue(eth->netdev[i]); + } +} + static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct mtk_mac *mac = netdev_priv(dev); @@ -695,7 +717,7 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) tx_num = mtk_cal_txd_req(skb); if (unlikely(atomic_read(&ring->free_count) <= tx_num)) { - netif_stop_queue(dev); + mtk_stop_queue(eth); netif_err(eth, tx_queued, dev, "Tx Ring full when queue awake!\n"); return NETDEV_TX_BUSY; @@ -720,10 +742,10 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) goto drop; if (unlikely(atomic_read(&ring->free_count) <= ring->thresh)) { - netif_stop_queue(dev); + mtk_stop_queue(eth); if (unlikely(atomic_read(&ring->free_count) > ring->thresh)) - netif_wake_queue(dev); + mtk_wake_queue(eth); } return NETDEV_TX_OK; @@ -897,13 +919,8 @@ static int mtk_poll_tx(struct mtk_eth *eth, int budget, bool *tx_again) if (!total) return 0; - for (i = 0; i < MTK_MAC_COUNT; i++) { - if (!eth->netdev[i] || - unlikely(!netif_queue_stopped(eth->netdev[i]))) - continue; - if (atomic_read(&ring->free_count) > ring->thresh) - netif_wake_queue(eth->netdev[i]); - } + if (atomic_read(&ring->free_count) > ring->thresh) + mtk_wake_queue(eth); return total; } -- cgit v0.10.2 From 34c2e4c9e9b3e434a31f67eecf603dc1496c8cc9 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:08 +0200 Subject: net: mediatek: fix TX locking Inside the TX path there is a lock inside the tx_map function. This is however too late. The patch moves the lock to the start of the xmit function right before the free count check of the DMA ring happens. If we do not do this, the code becomes racy leading to TX stalls and dropped packets. This happens as there are 2 netdevs running on the same physical DMA ring. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 4ebc42e..7b76075 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -536,7 +536,6 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev, struct mtk_eth *eth = mac->hw; struct mtk_tx_dma *itxd, *txd; struct mtk_tx_buf *tx_buf; - unsigned long flags; dma_addr_t mapped_addr; unsigned int nr_frags; int i, n_desc = 1; @@ -568,11 +567,6 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev, if (unlikely(dma_mapping_error(&dev->dev, mapped_addr))) return -ENOMEM; - /* normally we can rely on the stack not calling this more than once, - * however we have 2 queues running ont he same ring so we need to lock - * the ring access - */ - spin_lock_irqsave(ð->page_lock, flags); WRITE_ONCE(itxd->txd1, mapped_addr); tx_buf->flags |= MTK_TX_FLAGS_SINGLE0; dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr); @@ -632,8 +626,6 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev, WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) | (!nr_frags * TX_DMA_LS0))); - spin_unlock_irqrestore(ð->page_lock, flags); - netdev_sent_queue(dev, skb->len); skb_tx_timestamp(skb); @@ -661,8 +653,6 @@ err_dma: itxd = mtk_qdma_phys_to_virt(ring, itxd->txd2); } while (itxd != txd); - spin_unlock_irqrestore(ð->page_lock, flags); - return -ENOMEM; } @@ -712,14 +702,22 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) struct mtk_eth *eth = mac->hw; struct mtk_tx_ring *ring = ð->tx_ring; struct net_device_stats *stats = &dev->stats; + unsigned long flags; bool gso = false; int tx_num; + /* normally we can rely on the stack not calling this more than once, + * however we have 2 queues running on the same ring so we need to lock + * the ring access + */ + spin_lock_irqsave(ð->page_lock, flags); + tx_num = mtk_cal_txd_req(skb); if (unlikely(atomic_read(&ring->free_count) <= tx_num)) { mtk_stop_queue(eth); netif_err(eth, tx_queued, dev, "Tx Ring full when queue awake!\n"); + spin_unlock_irqrestore(ð->page_lock, flags); return NETDEV_TX_BUSY; } @@ -747,10 +745,12 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev) ring->thresh)) mtk_wake_queue(eth); } + spin_unlock_irqrestore(ð->page_lock, flags); return NETDEV_TX_OK; drop: + spin_unlock_irqrestore(ð->page_lock, flags); stats->tx_dropped++; dev_kfree_skb(skb); return NETDEV_TX_OK; -- cgit v0.10.2 From e7d425dcea032f1d0b44b6fa4c6735f13882de6e Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:09 +0200 Subject: net: mediatek: fix mtk_pending_work The driver supports 2 MACs. Both run on the same DMA ring. If we hit a TX timeout we need to stop both netdevs before restarting them again. If we don't do this, mtk_stop() wont shutdown DMA and the consecutive call to mtk_open() wont restart DMA and enable IRQs. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 7b76075..cd5d0c9 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1432,17 +1432,29 @@ static void mtk_pending_work(struct work_struct *work) { struct mtk_mac *mac = container_of(work, struct mtk_mac, pending_work); struct mtk_eth *eth = mac->hw; - struct net_device *dev = eth->netdev[mac->id]; - int err; + int err, i; + unsigned long restart = 0; rtnl_lock(); - mtk_stop(dev); - err = mtk_open(dev); - if (err) { - netif_alert(eth, ifup, dev, - "Driver up/down cycle failed, closing device.\n"); - dev_close(dev); + /* stop all devices to make sure that dma is properly shut down */ + for (i = 0; i < MTK_MAC_COUNT; i++) { + if (!netif_oper_up(eth->netdev[i])) + continue; + mtk_stop(eth->netdev[i]); + __set_bit(i, &restart); + } + + /* restart DMA and enable IRQs */ + for (i = 0; i < MTK_MAC_COUNT; i++) { + if (!test_bit(i, &restart)) + continue; + err = mtk_open(eth->netdev[i]); + if (err) { + netif_alert(eth, ifup, eth->netdev[i], + "Driver up/down cycle failed, closing device.\n"); + dev_close(eth->netdev[i]); + } } rtnl_unlock(); } -- cgit v0.10.2 From 7c78b4ad9bbdbe0bb4fbc98841ad9d904ee116e9 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:10 +0200 Subject: net: mediatek: move the pending_work struct to the device generic struct The worker always touches both netdevs. It is ethernet core and not MAC specific. We only need one worker, which belongs into the ethernets core struct. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index cd5d0c9..eb0d554 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1193,7 +1193,7 @@ static void mtk_tx_timeout(struct net_device *dev) eth->netdev[mac->id]->stats.tx_errors++; netif_err(eth, tx_err, dev, "transmit timed out\n"); - schedule_work(&mac->pending_work); + schedule_work(ð->pending_work); } static irqreturn_t mtk_handle_irq(int irq, void *_eth) @@ -1430,8 +1430,7 @@ static int mtk_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) static void mtk_pending_work(struct work_struct *work) { - struct mtk_mac *mac = container_of(work, struct mtk_mac, pending_work); - struct mtk_eth *eth = mac->hw; + struct mtk_eth *eth = container_of(work, struct mtk_eth, pending_work); int err, i; unsigned long restart = 0; @@ -1439,7 +1438,7 @@ static void mtk_pending_work(struct work_struct *work) /* stop all devices to make sure that dma is properly shut down */ for (i = 0; i < MTK_MAC_COUNT; i++) { - if (!netif_oper_up(eth->netdev[i])) + if (!eth->netdev[i]) continue; mtk_stop(eth->netdev[i]); __set_bit(i, &restart); @@ -1464,15 +1463,13 @@ static int mtk_cleanup(struct mtk_eth *eth) int i; for (i = 0; i < MTK_MAC_COUNT; i++) { - struct mtk_mac *mac = netdev_priv(eth->netdev[i]); - if (!eth->netdev[i]) continue; unregister_netdev(eth->netdev[i]); free_netdev(eth->netdev[i]); - cancel_work_sync(&mac->pending_work); } + cancel_work_sync(ð->pending_work); return 0; } @@ -1660,7 +1657,6 @@ static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np) mac->id = id; mac->hw = eth; mac->of_node = np; - INIT_WORK(&mac->pending_work, mtk_pending_work); mac->hw_stats = devm_kzalloc(eth->dev, sizeof(*mac->hw_stats), @@ -1762,6 +1758,7 @@ static int mtk_probe(struct platform_device *pdev) eth->dev = &pdev->dev; eth->msg_enable = netif_msg_init(mtk_msg_level, MTK_DEFAULT_MSG_ENABLE); + INIT_WORK(ð->pending_work, mtk_pending_work); err = mtk_hw_init(eth); if (err) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h index 48a5292..eed626d 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -363,6 +363,7 @@ struct mtk_rx_ring { * @clk_gp1: The gmac1 clock * @clk_gp2: The gmac2 clock * @mii_bus: If there is a bus we need to create an instance for it + * @pending_work: The workqueue used to reset the dma ring */ struct mtk_eth { @@ -389,6 +390,7 @@ struct mtk_eth { struct clk *clk_gp1; struct clk *clk_gp2; struct mii_bus *mii_bus; + struct work_struct pending_work; }; /* struct mtk_mac - the structure that holds the info about the MACs of the @@ -398,7 +400,6 @@ struct mtk_eth { * @hw: Backpointer to our main datastruture * @hw_stats: Packet statistics counter * @phy_dev: The attached PHY if available - * @pending_work: The workqueue used to reset the dma ring */ struct mtk_mac { int id; @@ -406,7 +407,6 @@ struct mtk_mac { struct mtk_eth *hw; struct mtk_hw_stats *hw_stats; struct phy_device *phy_dev; - struct work_struct pending_work; }; /* the struct describing the SoC. these are declared in the soc_xyz.c files */ -- cgit v0.10.2 From 369f04531f80c5e5d194a193a2b9e7676a77328d Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 8 Apr 2016 00:54:11 +0200 Subject: net: mediatek: do not set the QID field in the TX DMA descriptors The QID field gets set to the mac id. This made the DMA linked list queue the traffic of each MAC on a different internal queue. However during long term testing we found that this will cause traffic stalls as the multi queue setup requires a more complete initialisation which is not part of the upstream driver yet. This patch removes the code setting the QID field, resulting in all traffic ending up in queue 0 which works without any special setup. Signed-off-by: John Crispin Signed-off-by: David S. Miller diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index eb0d554..c984462 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -603,8 +603,7 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev, WRITE_ONCE(txd->txd1, mapped_addr); WRITE_ONCE(txd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(frag_map_size) | - last_frag * TX_DMA_LS0) | - mac->id); + last_frag * TX_DMA_LS0)); WRITE_ONCE(txd->txd4, 0); tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC; -- cgit v0.10.2