netdev - [PATCH] net: ll_temac: Improve error message on error IRQ

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Date:   Tue,  7 May 2019 08:42:57 +0200
From:   Esben Haabendal <esben@...nix.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Michal Simek <michal.simek@...inx.com>,
        Andrew Lunn <andrew@...n.ch>,
        YueHaibing <yuehaibing@...wei.com>,
        Yang Wei <yang.wei9@....com.cn>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: ll_temac: Improve error message on error IRQ

The channel status register value can be very helpful when debugging
SDMA problems.

Signed-off-by: Esben Haabendal <esben@...nix.com>
---
 drivers/net/ethernet/xilinx/ll_temac_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 9851991..36fc4c4 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -886,8 +886,10 @@ static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
 
 	if (status & (IRQ_COAL | IRQ_DLY))
 		temac_start_xmit_done(lp->ndev);
-	if (status & 0x080)
-		dev_err(&ndev->dev, "DMA error 0x%x\n", status);
+	if (status & (IRQ_ERR | IRQ_DMAERR))
+		dev_err_ratelimited(&ndev->dev,
+				    "TX error 0x%x TX_CHNL_STS=0x%08x\n",
+				    status, lp->dma_in(lp, TX_CHNL_STS));
 
 	return IRQ_HANDLED;
 }
@@ -904,6 +906,10 @@ static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
 
 	if (status & (IRQ_COAL | IRQ_DLY))
 		ll_temac_recv(lp->ndev);
+	if (status & (IRQ_ERR | IRQ_DMAERR))
+		dev_err_ratelimited(&ndev->dev,
+				    "RX error 0x%x RX_CHNL_STS=0x%08x\n",
+				    status, lp->dma_in(lp, RX_CHNL_STS));
 
 	return IRQ_HANDLED;
 }
-- 
2.4.11