5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Raju Rangoju <Raju.Rangoju@xxxxxxx>
[ Upstream commit 7121205d5330c6a3cb3379348886d47c77b78d06 ]
The existing implementation uses software logic to accumulate tx
completions until the specified time (1ms) is met and then poll them.
However, there exists a tiny gap which leads to a race between
resetting and checking the tx_activate flag. Due to this the tx
completions are not reported to upper layer and tx queue timeout
kicks-in restarting the device.
To address this, introduce a tx cleanup mechanism as part of the
periodic maintenance process.
Fixes: c5aa9e3b8156 ("amd-xgbe: Initial AMD 10GbE platform driver")
Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
Signed-off-by: Raju Rangoju <Raju.Rangoju@xxxxxxx>
Reviewed-by: Wojciech Drewek <wojciech.drewek@xxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/amd/xgbe/xgbe-drv.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
index 7f705483c1c57..504fbd43be7da 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
@@ -682,10 +682,24 @@ static void xgbe_service(struct work_struct *work)
static void xgbe_service_timer(struct timer_list *t)
{
struct xgbe_prv_data *pdata = from_timer(pdata, t, service_timer);
+ struct xgbe_channel *channel;
+ unsigned int i;
queue_work(pdata->dev_workqueue, &pdata->service_work);
mod_timer(&pdata->service_timer, jiffies + HZ);
+
+ if (!pdata->tx_usecs)
+ return;
+
+ for (i = 0; i < pdata->channel_count; i++) {
+ channel = pdata->channel[i];
+ if (!channel->tx_ring || channel->tx_timer_active)
+ break;
+ channel->tx_timer_active = 1;
+ mod_timer(&channel->tx_timer,
+ jiffies + usecs_to_jiffies(pdata->tx_usecs));
+ }
}
static void xgbe_init_timers(struct xgbe_prv_data *pdata)
--
2.42.0
