Thread (48 messages) 48 messages, 3 authors, 2021-01-10

RE: [EXT] Re: [PATCH RFC net-next 14/19] net: mvpp2: add ethtool flow control configuration support

From: Stefan Chulski <hidden>
Date: 2021-01-10 17:56:26
Also in: lkml

quoted
@@ -5373,6 +5402,30 @@ static int
mvpp2_ethtool_set_pause_param(struct net_device *dev,
quoted
 					 struct ethtool_pauseparam *pause)  {
 	struct mvpp2_port *port = netdev_priv(dev);
+	int i;
+
+	if (pause->tx_pause && port->priv->global_tx_fc) {
+		port->tx_fc = true;
+		mvpp2_rxq_enable_fc(port);
+		if (port->priv->percpu_pools) {
+			for (i = 0; i < port->nrxqs; i++)
+				mvpp2_bm_pool_update_fc(port, &port-
priv->bm_pools[i], true);
+		} else {
+			mvpp2_bm_pool_update_fc(port, port->pool_long,
true);
quoted
+			mvpp2_bm_pool_update_fc(port, port->pool_short,
true);
quoted
+		}
+
+	} else if (port->priv->global_tx_fc) {
+		port->tx_fc = false;
+		mvpp2_rxq_disable_fc(port);
+		if (port->priv->percpu_pools) {
+			for (i = 0; i < port->nrxqs; i++)
+				mvpp2_bm_pool_update_fc(port, &port-
priv->bm_pools[i], false);
+		} else {
+			mvpp2_bm_pool_update_fc(port, port->pool_long,
false);
quoted
+			mvpp2_bm_pool_update_fc(port, port->pool_short,
false);
quoted
+		}
+	}

This looks wrong. Flow control is normally the result of auto negotiation. Both
ends need to agree to it. Which is why
mvpp2_ethtool_set_pause_param() passes the users request onto phylink.
phylink will handle the autoneg and then ask the MAC to setup flow control
depending on the result in mvpp2_mac_link_up().

	Andrew
Ok, I would move it to mvpp2_mac_link_up.

Stefan,
Thanks.
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