linux-kernel - [PATCH V2 net 4/4] net: fec: use netdev_err_once() instead of netdev

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Message-Id: <20230706081012.2278063-5-wei.fang@nxp.com>
Date:   Thu,  6 Jul 2023 16:10:12 +0800
From:   wei.fang@....com
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, shenwei.wang@....com,
        xiaoning.wang@....com, netdev@...r.kernel.org
Cc:     linux-imx@....com, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH V2 net 4/4] net: fec: use netdev_err_once() instead of netdev_err()

From: Wei Fang <wei.fang@....com>

In the case of heavy XDP traffic to be transmitted, the console
will print the error log continuously if there are lack of enough
BDs to accommodate the frames. The log looks like below.

[  160.013112] fec 30be0000.ethernet eth0: NOT enough BD for SG!
[  160.023116] fec 30be0000.ethernet eth0: NOT enough BD for SG!
[  160.028926] fec 30be0000.ethernet eth0: NOT enough BD for SG!
[  160.038946] fec 30be0000.ethernet eth0: NOT enough BD for SG!
[  160.044758] fec 30be0000.ethernet eth0: NOT enough BD for SG!

Not only will this log be replicated and redundant, it will also
degrade XDP performance. So we use netdev_err_once() instead of
netdev_err() now.

Fixes: 6d6b39f180b8 ("net: fec: add initial XDP support")
Signed-off-by: Wei Fang <wei.fang@....com>
---
V2 change:
This is a new patch which is separated from the patch 3.
---
 drivers/net/ethernet/freescale/fec_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index c59576ab8c7a..ec9e4bdb0c06 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3836,7 +3836,7 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,

 	entries_free = fec_enet_get_free_txdesc_num(txq);
 	if (entries_free < MAX_SKB_FRAGS + 1) {
-		netdev_err(fep->netdev, "NOT enough BD for SG!\n");
+		netdev_err_once(fep->netdev, "NOT enough BD for SG!\n");
 		return -EBUSY;
 	}

-- 
2.25.1