linux/ena: Print last interrupt time on tx timeout

Adding the timestamp of the last interrupt to the TX timeout routine. This provides more information and may help identifying the reason of the timeout. Signed-off-by: Evgeny Ostrovsky <[email protected]>
amzn · Feb 21, 2024 · 9d9291e · 9d9291e
1 parent cea2183
commit 9d9291e
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/kernel/linux/ena/ena_netdev.c b/kernel/linux/ena/ena_netdev.c
@@ -98,6 +98,7 @@ static void ena_tx_timeout(struct net_device *dev, unsigned int txqueue)
 	enum ena_regs_reset_reason_types reset_reason = ENA_REGS_RESET_OS_NETDEV_WD;
 	struct ena_adapter *adapter = netdev_priv(dev);
 	unsigned int time_since_last_napi, threshold;
+	unsigned long jiffies_since_last_intr;
 	struct ena_ring *tx_ring;
 	int napi_scheduled;
 
@@ -112,12 +113,15 @@ static void ena_tx_timeout(struct net_device *dev, unsigned int txqueue)
 	time_since_last_napi = jiffies_to_usecs(jiffies - tx_ring->tx_stats.last_napi_jiffies);
 	napi_scheduled = !!(tx_ring->napi->state & NAPIF_STATE_SCHED);
 
+	jiffies_since_last_intr = jiffies - READ_ONCE(adapter->ena_napi[txqueue].last_intr_jiffies);
+
 	netdev_err(dev,
-		   "TX q %d is paused for too long (threshold %u). Time since last napi %u usec. napi scheduled: %d\n",
+		   "TX q %d is paused for too long (threshold %u). Time since last napi %u usec. napi scheduled: %d. msecs since last interrupt: %u\n",
 		   txqueue,
 		   threshold,
 		   time_since_last_napi,
-		   napi_scheduled);
+		   napi_scheduled,
+		   jiffies_to_msecs(jiffies_since_last_intr));
 
 	if (threshold < time_since_last_napi && napi_scheduled) {
 		netdev_err(dev,