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

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Message-Id: <20180924091106.15094-3-maxime.chevallier@bootlin.com>
Date:   Mon, 24 Sep 2018 11:11:06 +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 2/2] net: mvpp2: use round-robin scheduling for TX queues on the same CPU

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 <ymarkman@...vell.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.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