netdev - [PATCH net-next 1/2] net: mvpp2: support XPS by mapping TX queues to CPUs

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Message-Id: <20180924091106.15094-2-maxime.chevallier@bootlin.com>
Date:   Mon, 24 Sep 2018 11:11:05 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     davem@...emloft.net
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        thomas.petazzoni@...tlin.com, gregory.clement@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        ymarkman@...vell.com, mw@...ihalf.com
Subject: [PATCH net-next 1/2] net: mvpp2: support XPS by mapping TX queues to CPUs

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@...vell.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index d30ccc515bb7..bdacb9577216 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -2423,13 +2423,17 @@ static int mvpp2_setup_rxqs(struct mvpp2_port *port)
 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) {
-- 
2.11.0