[PATCH] net/wan/fsl_ucc_hdlc: add BQL support

[Mathias Thore]

Add byte queue limits support in the fsl_ucc_hdlc driver.

Signed-off-by: Mathias Thore <mathias.th...@infinera.com>
---

Note that this patch is created relative to another patch that was
applied recently: net/wan/fsl_ucc_hdlc: error counters

 drivers/net/wan/fsl_ucc_hdlc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 4d6409605207..7a42336c8af8 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -391,6 +391,7 @@ static netdev_tx_t ucc_hdlc_tx(struct sk_buff *skb, struct 
net_device *dev)
                dev_kfree_skb(skb);
                return -ENOMEM;
        }
+       netdev_sent_queue(dev, skb->len);
        spin_lock_irqsave(&priv->lock, flags);
 
        /* Start from the next BD that should be filled */
@@ -447,6 +448,8 @@ static int hdlc_tx_done(struct ucc_hdlc_private *priv)
 {
        /* Start from the next BD that should be filled */
        struct net_device *dev = priv->ndev;
+       unsigned int bytes_sent = 0;
+       int howmany = 0;
        struct qe_bd *bd;               /* BD pointer */
        u16 bd_status;
        int tx_restart = 0;
@@ -474,6 +477,8 @@ static int hdlc_tx_done(struct ucc_hdlc_private *priv)
                skb = priv->tx_skbuff[priv->skb_dirtytx];
                if (!skb)
                        break;
+               howmany++;
+               bytes_sent += skb->len;
                dev->stats.tx_packets++;
                memset(priv->tx_buffer +
                       (be32_to_cpu(bd->buf) - priv->dma_tx_addr),
@@ -501,6 +506,7 @@ static int hdlc_tx_done(struct ucc_hdlc_private *priv)
        if (tx_restart)
                hdlc_tx_restart(priv);
 
+       netdev_completed_queue(dev, howmany, bytes_sent);
        return 0;
 }
 
@@ -721,6 +727,7 @@ static int uhdlc_open(struct net_device *dev)
                priv->hdlc_busy = 1;
                netif_device_attach(priv->ndev);
                napi_enable(&priv->napi);
+               netdev_reset_queue(dev);
                netif_start_queue(dev);
                hdlc_open(dev);
        }
@@ -812,6 +819,7 @@ static int uhdlc_close(struct net_device *dev)
 
        free_irq(priv->ut_info->uf_info.irq, priv);
        netif_stop_queue(dev);
+       netdev_reset_queue(dev);
        priv->hdlc_busy = 0;
 
        return 0;
-- 
2.18.1