[PATCH] net: lwip: Remove error print on failed tx

[Ilias Apalodimas]

When an ethernet driver fails to send a frame we print an error in lwIP.
But depending on how often that error is it might significantly delay
transmissions.

For example downloading a big file with the rpi4 spams the console with
'send error: -101', but removing the print makes the file download with
an average speed of ~8.5MiB/s since the packets are retransmitted.

So let's move it to a 'debug' in lwIP and expect ethernet drivers to handle
the failure if it's severe.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
 net/lwip/net-lwip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/lwip/net-lwip.c b/net/lwip/net-lwip.c
index c00a7fe97cd6..6b7b696dbf0f 100644
--- a/net/lwip/net-lwip.c
+++ b/net/lwip/net-lwip.c
@@ -57,7 +57,7 @@ static err_t net_lwip_tx(struct netif *netif, struct pbuf *p)
 	err = eth_get_ops(udev)->send(udev, pp ? pp : p->payload, p->len);
 	free(pp);
 	if (err) {
-		log_err("send error %d\n", err);
+		debug("send error %d\n", err);
 		return ERR_ABRT;
 	}

--
2.47.2