netdev - [PATCH net-next 1/1] net: stmmac: perserve TX and RX coalesce value during XDP setup

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Date:   Wed, 24 Nov 2021 19:40:19 +0800
From:   Ong Boon Leong <boon.leong.ong@...el.com>
To:     netdev@...r.kernel.org
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        alexandre.torgue@...s.st.com, Kurt Kanzenbach <kurt@...utronix.de>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        Ong Boon Leong <boon.leong.ong@...el.com>
Subject: [PATCH net-next 1/1] net: stmmac: perserve TX and RX coalesce value during XDP setup

When XDP program is loaded, it is desirable that the previous TX and RX
coalesce values are not re-inited to its default value. This prevents
unnecessary re-configurig the coalesce values that were working fine
before.

Fixes: ac746c8520d9 ("net: stmmac: enhance XDP ZC driver level switching performance")
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 21111df7371..a122a161872 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6527,6 +6527,9 @@ int stmmac_xdp_open(struct net_device *dev)
 		tx_q->tx_tail_addr = tx_q->dma_tx_phy;
 		stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
 				       tx_q->tx_tail_addr, chan);
+
+		hrtimer_init(&tx_q->txtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+		tx_q->txtimer.function = stmmac_tx_timer;
 	}
 
 	/* Enable the MAC Rx/Tx */
@@ -6535,8 +6538,6 @@ int stmmac_xdp_open(struct net_device *dev)
 	/* Start Rx & Tx DMA Channels */
 	stmmac_start_all_dma(priv);
 
-	stmmac_init_coalesce(priv);
-
 	ret = stmmac_request_irq(dev);
 	if (ret)
 		goto irq_error;
-- 
2.25.1