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 <[email protected]>
Signed-off-by: Maxime Chevallier <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index d30ccc515bb75524a2422782b8da8b15659ba770..bdacb957721630855b70d76d6df70711c7bfefa5 100644 (file)
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -2423,13 +2423,17 @@ 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) {