[PATCH net-next 2/2] net: mvpp2: use round-robin scheduling for TX queues on the same CPU

[Maxime Chevallier]

This commit allows each TXQ to be picked in a round-robin fashion by
the PPv2 transmit scheduling mechanism. This is opposed to the default
behaviour that prioritizes the highest numbered queues.

Suggested-by: Yan Markman <ymark...@marvell.com>
Signed-off-by: Maxime Chevallier <maxime.chevall...@bootlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h      | 1 +
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h 
b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index f5dceef60b0e..176c6b56fdcc 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -331,6 +331,7 @@
 #define     MVPP2_TXP_SCHED_ENQ_MASK           0xff
 #define     MVPP2_TXP_SCHED_DISQ_OFFSET                8
 #define MVPP2_TXP_SCHED_CMD_1_REG              0x8010
+#define MVPP2_TXP_SCHED_FIXED_PRIO_REG         0x8014
 #define MVPP2_TXP_SCHED_PERIOD_REG             0x8018
 #define MVPP2_TXP_SCHED_MTU_REG                        0x801c
 #define     MVPP2_TXP_MTU_MAX                  0x7FFFF
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c 
b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index bdacb9577216..c2ed71788e4f 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1448,6 +1448,9 @@ static void mvpp2_defaults_set(struct mvpp2_port *port)
                    tx_port_num);
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_CMD_1_REG, 0);
 
+       /* Set TXQ scheduling to Round-Robin */
+       mvpp2_write(port->priv, MVPP2_TXP_SCHED_FIXED_PRIO_REG, 0);
+
        /* Close bandwidth for all queues */
        for (queue = 0; queue < MVPP2_MAX_TXQ; queue++) {
                ptxq = mvpp2_txq_phys(port->id, queue);
-- 
2.11.0