linux-kernel - [PATCH net-next 3/3] net: mvpp2: print rx error with rate-limit

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Message-Id: <20180517083427.15793-4-antoine.tenart@bootlin.com>
Date:   Thu, 17 May 2018 10:34:27 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     davem@...emloft.net
Cc:     Yan Markman <ymarkman@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
        maxime.chevallier@...tlin.com, gregory.clement@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        mw@...ihalf.com, Antoine Tenart <antoine.tenart@...tlin.com>
Subject: [PATCH net-next 3/3] net: mvpp2: print rx error with rate-limit

From: Yan Markman <ymarkman@...vell.com>

Prevent flood of RX error prints during heavy traffic with weak signal
in link by checking net_ratelimit() before using netdev_err().

Signed-off-by: Yan Markman <ymarkman@...vell.com>
[Antoine: small rework, commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
---
 drivers/net/ethernet/marvell/mvpp2.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index a9483da18e00..f8ed983bc767 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -6382,21 +6382,23 @@ static void mvpp2_rx_error(struct mvpp2_port *port,
 {
 	u32 status = mvpp2_rxdesc_status_get(port, rx_desc);
 	size_t sz = mvpp2_rxdesc_size_get(port, rx_desc);
+	char *err_str = NULL;
 
 	switch (status & MVPP2_RXD_ERR_CODE_MASK) {
 	case MVPP2_RXD_ERR_CRC:
-		netdev_err(port->dev, "bad rx status %08x (crc error), size=%zu\n",
-			   status, sz);
+		err_str = "crc";
 		break;
 	case MVPP2_RXD_ERR_OVERRUN:
-		netdev_err(port->dev, "bad rx status %08x (overrun error), size=%zu\n",
-			   status, sz);
+		err_str = "overrun";
 		break;
 	case MVPP2_RXD_ERR_RESOURCE:
-		netdev_err(port->dev, "bad rx status %08x (resource error), size=%zu\n",
-			   status, sz);
+		err_str = "resource";
 		break;
 	}
+	if (err_str && net_ratelimit())
+		netdev_err(port->dev,
+			   "bad rx status %08x (%s error), size=%zu\n",
+			   status, err_str, sz);
 }
 
 /* Handle RX checksum offload */
-- 
2.17.0