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net: stmmac: fix handling of zero coalescing tx-usecs 

Setting ethtool -C eth0 tx-usecs 0 is supposed to disable the use of the
coalescing timer but currently it gets programmed with zero delay
instead.

Disable the use of the coalescing timer if tx-usecs is zero by
preventing it from being restarted.  Note that to keep things simple we
don't start/stop the timer when the coalescing settings are changed, but
just let that happen on the next transmit or timer expiry.

Fixes: 8fce333170 ("net: stmmac: Rework coalesce timer and fix multi-queue races")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vincent Whitchurch 2023-09-07 12:46:31 +02:00 committed by David S. Miller
parent 6eadb0b3d0
commit fa60b81638
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -2704,9 +2704,7 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue)
/* We still have pending packets, let's call for a new scheduling */
if (tx_q->dirty_tx != tx_q->cur_tx)
hrtimer_start(&tx_q->txtimer,
STMMAC_COAL_TIMER(priv->tx_coal_timer[queue]),
HRTIMER_MODE_REL);
stmmac_tx_timer_arm(priv, queue);
flags = u64_stats_update_begin_irqsave(&tx_q->txq_stats.syncp);
tx_q->txq_stats.tx_packets += tx_packets;
@ -2995,9 +2993,13 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
static void stmmac_tx_timer_arm(struct stmmac_priv *priv, u32 queue)
{
struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
u32 tx_coal_timer = priv->tx_coal_timer[queue];
if (!tx_coal_timer)
return;
hrtimer_start(&tx_q->txtimer,
STMMAC_COAL_TIMER(priv->tx_coal_timer[queue]),
STMMAC_COAL_TIMER(tx_coal_timer),
HRTIMER_MODE_REL);
}