From: Maxime Chevallier <maxime.chevallier@bootlin.com>
Date: Mon, 24 Sep 2018 11:11:05 +0200
Subject: net: mvpp2: support XPS by mapping TX queues to CPUs
Patch-mainline: v4.20-rc1
Git-commit: 0d283ab5b4fdbcd6bde4505863010b6008b6f048
References: bsc#1119113 FATE#326472

Since the PPv2 controller has multiple TX queues, we can spread traffic
by assining TX queues to CPUs, allowing to use XPS to balance egress
traffic between CPUs.

Suggested-by : Yan Markman <ymarkman@marvell.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -2424,13 +2424,17 @@ err_cleanup:
 static int mvpp2_setup_txqs(struct mvpp2_port *port)
 {
 	struct mvpp2_tx_queue *txq;
-	int queue, err;
+	int queue, err, cpu;
 
 	for (queue = 0; queue < port->ntxqs; queue++) {
 		txq = port->txqs[queue];
 		err = mvpp2_txq_init(port, txq);
 		if (err)
 			goto err_cleanup;
+
+		/* Assign this queue to a CPU */
+		cpu = queue % num_present_cpus();
+		netif_set_xps_queue(port->dev, cpumask_of(cpu), queue);
 	}
 
 	if (port->has_tx_irqs) {