netdev - [PATCH net-next 3/3] dpaa2-eth: Add mqprio support

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Date:   Wed,  5 Jun 2019 12:57:26 +0300
From:   Ioana Radulescu <ruxandra.radulescu@....com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     ioana.ciornei@....com
Subject: [PATCH net-next 3/3] dpaa2-eth: Add mqprio support

Implement mqprio qdisc support by mapping traffic classes to
different hardware enqueue priorities. The maximum number of
supported traffic classes is an attribute of each DPNI object.

The traffic classes map to hardware priorities from highest (0)
to lowest (highest prio number). The driver assigns num_queues
to each traffic class, for a total of num_queues x num_tcs
hardware frame queues.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@....com>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 43 ++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 0f6d15c..cd34898 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -1915,6 +1915,48 @@ static int update_xps(struct dpaa2_eth_priv *priv)
 	return err;
 }
 
+static int dpaa2_eth_setup_tc(struct net_device *net_dev,
+			      enum tc_setup_type type, void *type_data)
+{
+	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
+	struct tc_mqprio_qopt *mqprio = type_data;
+	u8 num_tc, num_queues;
+	int i;
+
+	if (type != TC_SETUP_QDISC_MQPRIO)
+		return -EINVAL;
+
+	mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
+	num_queues = dpaa2_eth_queue_count(priv);
+	num_tc = mqprio->num_tc;
+
+	if (num_tc == net_dev->num_tc)
+		return 0;
+
+	if (num_tc  > dpaa2_eth_tc_count(priv)) {
+		netdev_err(net_dev, "Max %d traffic classes supported\n",
+			   dpaa2_eth_tc_count(priv));
+		return -EINVAL;
+	}
+
+	if (!num_tc) {
+		netdev_reset_tc(net_dev);
+		netif_set_real_num_tx_queues(net_dev, num_queues);
+		goto out;
+	}
+
+	netdev_set_num_tc(net_dev, num_tc);
+	netif_set_real_num_tx_queues(net_dev, num_tc * num_queues);
+
+	for (i = 0; i < num_tc; i++)
+		netdev_set_tc_queue(net_dev, i, num_queues, i * num_queues);
+
+out:
+	update_xps(priv);
+
+	return 0;
+}
+
 static const struct net_device_ops dpaa2_eth_ops = {
 	.ndo_open = dpaa2_eth_open,
 	.ndo_start_xmit = dpaa2_eth_tx,
@@ -1927,6 +1969,7 @@ static const struct net_device_ops dpaa2_eth_ops = {
 	.ndo_change_mtu = dpaa2_eth_change_mtu,
 	.ndo_bpf = dpaa2_eth_xdp,
 	.ndo_xdp_xmit = dpaa2_eth_xdp_xmit,
+	.ndo_setup_tc = dpaa2_eth_setup_tc,
 };
 
 static void cdan_cb(struct dpaa2_io_notification_ctx *ctx)
-- 
2.7.4