netdev - [PATCH v2 net-next 1/5] ionic: debug line for Tx completion errors

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Message-ID: <20240826184422.21895-2-brett.creeley@amd.com>
Date: Mon, 26 Aug 2024 11:44:18 -0700
From: Brett Creeley <brett.creeley@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>
CC: <shannon.nelson@....com>, <brett.creeley@....com>
Subject: [PATCH v2 net-next 1/5] ionic: debug line for Tx completion errors

From: Shannon Nelson <shannon.nelson@....com>

Here's a little debugging aid in case the device starts throwing
Tx completion errors.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
Signed-off-by: Brett Creeley <brett.creeley@....com>
---
 drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index fc79baad4561..ccdc0eefabe4 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -648,7 +648,14 @@ static void ionic_rx_clean(struct ionic_queue *q,
 
 	stats = q_to_rx_stats(q);
 
-	if (comp->status) {
+	if (unlikely(comp->status)) {
+		/* Most likely status==2 and the pkt received was bigger
+		 * than the buffer available: comp->len will show the
+		 * pkt size received that didn't fit the advertised desc.len
+		 */
+		dev_dbg(q->dev, "q%d drop comp->status %d comp->len %d desc->len %d\n",
+			q->index, comp->status, comp->len, q->rxq[q->head_idx].len);
+
 		stats->dropped++;
 		return;
 	}
-- 
2.17.1