linux-kernel - [PATCH net-next 3/3] net: stmmac: Configure AXI on Tegra234 MGBE

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Message-Id: <20240201-stmmac-axi-config-v1-3-822e97b2d26e@nvidia.com>
Date: Thu, 01 Feb 2024 19:49:07 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Jose Abreu <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-tegra@...r.kernel.org, Thierry Reding <treding@...dia.com>
Subject: [PATCH net-next 3/3] net: stmmac: Configure AXI on Tegra234 MGBE

From: Thierry Reding <treding@...dia.com>

Allow the device to use bursts and increase the maximum number of
outstanding requests to improve performance. Measurements show an
increase in throughput of around 5x on a 1 Gbps link.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c
index bab57d1675df..b6bfa48f279d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c
@@ -199,6 +199,12 @@ static void mgbe_uphy_lane_bringup_serdes_down(struct net_device *ndev, void *mg
 	writel(value, mgbe->xpcs + XPCS_WRAP_UPHY_RX_CONTROL);
 }

+static const struct stmmac_axi tegra234_mgbe_axi = {
+	.axi_wr_osr_lmt = 63,
+	.axi_rd_osr_lmt = 63,
+	.axi_blen = { 256, },
+};
+
 static int tegra_mgbe_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat;
@@ -284,6 +290,9 @@ static int tegra_mgbe_probe(struct platform_device *pdev)
 	if (err < 0)
 		goto disable_clks;

+	/* setup default AXI configuration */
+	res.axi = &tegra234_mgbe_axi;
+
 	plat = devm_stmmac_probe_config_dt(pdev, &res);
 	if (IS_ERR(plat)) {
 		err = PTR_ERR(plat);

-- 
2.43.0