linux-kernel - [PATCH net-next 2/7] net: stmmac: correct Tx descriptors debugfs prints

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Message-Id: <20250826113247.3481273-3-konrad.leszczynski@intel.com>
Date: Tue, 26 Aug 2025 13:32:42 +0200
From: Konrad Leszczynski <konrad.leszczynski@...el.com>
To: davem@...emloft.net,
	andrew+netdev@...n.ch,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	cezary.rojewski@...el.com,
	sebastian.basierski@...el.com,
	Piotr Warpechowski <piotr.warpechowski@...el.com>,
	Konrad Leszczynski <konrad.leszczynski@...el.com>
Subject: [PATCH net-next 2/7] net: stmmac: correct Tx descriptors debugfs prints

From: Piotr Warpechowski <piotr.warpechowski@...el.com>

It was observed that extended descriptors are not printed out fully and
enhanced descriptors are completely omitted in stmmac_rings_status_show().

Correct printing according to documentation and other existing prints in
the driver.

Reviewed-by: Konrad Leszczynski <konrad.leszczynski@...el.com>
Reviewed-by: Sebastian Basierski <sebastian.basierski@...el.com>
Signed-off-by: Piotr Warpechowski <piotr.warpechowski@...el.com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 31 ++++++++++++++-----
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index b948df1bff9a..bda1a83607c0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6349,14 +6349,25 @@ static void sysfs_display_ring(void *head, int size, int extend_desc,
 	desc_size = extend_desc ? sizeof(*ep) : sizeof(*p);
 	for (i = 0; i < size; i++) {
 		dma_addr = dma_phy_addr + i * desc_size;
-		seq_printf(seq, "%d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
-				i, &dma_addr,
-				le32_to_cpu(p->des0), le32_to_cpu(p->des1),
-				le32_to_cpu(p->des2), le32_to_cpu(p->des3));
-		if (extend_desc)
-			p = &(++ep)->basic;
-		else
+		if (extend_desc) {
+			seq_printf(seq, "%d [%pad]: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
+				   i, &dma_addr,
+				   le32_to_cpu(ep->basic.des0),
+				   le32_to_cpu(ep->basic.des1),
+				   le32_to_cpu(ep->basic.des2),
+				   le32_to_cpu(ep->basic.des3),
+				   le32_to_cpu(ep->des4),
+				   le32_to_cpu(ep->des5),
+				   le32_to_cpu(ep->des6),
+				   le32_to_cpu(ep->des7));
+			ep++;
+		} else {
+			seq_printf(seq, "%d [%pad]: 0x%x 0x%x 0x%x 0x%x\n",
+				   i, &dma_addr,
+				   le32_to_cpu(p->des0), le32_to_cpu(p->des1),
+				   le32_to_cpu(p->des2), le32_to_cpu(p->des3));
 			p++;
+		}
 	}
 }
 
@@ -6396,7 +6407,11 @@ static int stmmac_rings_status_show(struct seq_file *seq, void *v)
 			seq_printf(seq, "Extended descriptor ring:\n");
 			sysfs_display_ring((void *)tx_q->dma_etx,
 					   priv->dma_conf.dma_tx_size, 1, seq, tx_q->dma_tx_phy);
-		} else if (!(tx_q->tbs & STMMAC_TBS_AVAIL)) {
+		} else if (tx_q->tbs & STMMAC_TBS_AVAIL) {
+			seq_printf(seq, "Enhanced descriptor ring:\n");
+			sysfs_display_ring((void *)tx_q->dma_entx,
+					   priv->dma_conf.dma_tx_size, 1, seq, tx_q->dma_tx_phy);
+		} else {
 			seq_printf(seq, "Descriptor ring:\n");
 			sysfs_display_ring((void *)tx_q->dma_tx,
 					   priv->dma_conf.dma_tx_size, 0, seq, tx_q->dma_tx_phy);
-- 
2.34.1