ionic: Rate limit unknown xcvr type messages

Running ethtool repeatedly with a transceiver unknown to the driver or firmware will cause the driver to spam the kernel logs with "unknown xcvr type" messages which can distract from real issues; and this isn't interesting information outside of debugging. Fix this by rate limiting the output so that there are still notifications but not so many that they flood the log.

Using dev_dbg_once() would reduce the number of messages further, but this would miss the case where a different unknown transceiver type is plugged in, and its status is requested.

---
 drivers/net/ethernet/pensando/ionic/ionic_ethtool.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

index 2d9efadb5d2a..347b0aff100b 100644
@@ -263,9 +263,10 @@ static int ionic_get_link_ksettings(struct net_device *netdev,
 		/* This means there's no module plugged in */
 		break;
 	default:
-		dev_info(lif->ionic->dev, "unknown xcvr type pid=%d / 0x%x\n",
-			 idev->port_info->status.xcvr.pid,
-			 idev->port_info->status.xcvr.pid);
+		dev_dbg_ratelimited(lif->ionic->dev,
+				    "unknown xcvr type pid=%d / 0x%x\n",
+				    idev->port_info->status.xcvr.pid,
+				    idev->port_info->status.xcvr.pid);
 		break;
 	}
 

2.17.1