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SubjectRe: stmmac ethernet in kernel 4.9-rc6: coalescing related pauses.
Hi!

What is going on with stmmac_tso_xmit() vs. stmmac_xmit()? One seems
to be copy of another, with subtle differences -- like calling
netif_queue_stopped() under spin_lock(&priv->tx_lock), or not.

What is going on with all these likely()s? Likely new hardware owners
will not be happy... or anyone running a lot of jumbo frames. (Perhaps
CPU's branch prediction can do better job here, without explicit hints?)

if (unlikely(is_jumbo) && likely(priv->synopsys_id <
DWMAC_CORE_4_00)) {

Are you sure this is okay?

if (unlikely(netif_queue_stopped(priv->dev) &&
stmmac_tx_avail(priv) > STMMAC_TX_THRESH)) {
netif_tx_lock(priv->dev);
if (netif_queue_stopped(priv->dev) &&
stmmac_tx_avail(priv) > STMMAC_TX_THRESH) {

---

Fix english in comments.

Signed-off-by: Pavel Machek <pavel@ucw.cz>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1f9ec02..e5a5a05 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1747,11 +1747,11 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
if (priv->hw->pcs && priv->hw->mac->pcs_ctrl_ane)
priv->hw->mac->pcs_ctrl_ane(priv->hw, 1, priv->hw->ps, 0);

- /* set TX ring length */
+ /* Set TX ring length */
if (priv->hw->dma->set_tx_ring_len)
priv->hw->dma->set_tx_ring_len(priv->ioaddr,
(DMA_TX_SIZE - 1));
- /* set RX ring length */
+ /* Set RX ring length */
if (priv->hw->dma->set_rx_ring_len)
priv->hw->dma->set_rx_ring_len(priv->ioaddr,
(DMA_RX_SIZE - 1));
@@ -2212,7 +2212,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
priv->tx_skbuff[first_entry] = skb;

enh_desc = priv->plat->enh_desc;
- /* To program the descriptors according to the size of the frame */
+ /* Program the descriptors according to the size of the frame */
if (enh_desc)
is_jumbo = priv->hw->mode->is_jumbo_frm(skb->len, enh_desc);

@@ -2665,7 +2665,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
* @budget : maximum number of packets that the current CPU can receive from
* all interfaces.
* Description :
- * To look at the incoming frames and clear the tx resources.
+ * Look at the incoming frames and clear the tx resources.
*/
static int stmmac_poll(struct napi_struct *napi, int budget)
{
@@ -2828,7 +2828,7 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
return IRQ_NONE;
}

- /* To handle GMAC own interrupts */
+ /* Handle GMAC own interrupts */
if ((priv->plat->has_gmac) || (priv->plat->has_gmac4)) {
int status = priv->hw->mac->host_irq_status(priv->hw,
&priv->xstats);
@@ -2853,7 +2853,7 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
}
}

- /* To handle DMA interrupts */
+ /* Handle DMA interrupts */
stmmac_dma_interrupt(priv);

return IRQ_HANDLED;
@@ -3145,7 +3145,7 @@ static int stmmac_hw_init(struct stmmac_priv *priv)

priv->hw = mac;

- /* To use the chained or ring mode */
+ /* Use the chained or ring mode */
if (priv->synopsys_id >= DWMAC_CORE_4_00) {
priv->hw->mode = &dwmac4_ring_mode_ops;
} else {
@@ -3191,7 +3191,7 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
} else
pr_info(" No HW DMA feature register supported");

- /* To use alternate (extended), normal or GMAC4 descriptor structures */
+ /* Use alternate (extended), normal or GMAC4 descriptor structures */
if (priv->synopsys_id >= DWMAC_CORE_4_00)
priv->hw->desc = &dwmac4_desc_ops;
else


--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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