netdev - [net PATCH] net: stmmac: replace priv->speed with the portTransmitRate from the tc-cbs parameters

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Date: Fri,  7 Jun 2024 18:33:27 +0800
From: Xiaolei Wang <xiaolei.wang@...driver.com>
To: olteanv@...il.com, linux@...linux.org.uk, andrew@...n.ch,
        alexandre.torgue@...s.st.com, joabreu@...opsys.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mcoquelin.stm32@...il.com
Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [net PATCH] net: stmmac: replace priv->speed with the portTransmitRate from the tc-cbs parameters

Since the given offload->sendslope only applies to the
current link speed, and userspace may reprogram it when
the link speed changes, don't even bother tracking the
port's link speed, and deduce the port transmit rate
from idleslope - sentslope instead.

Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 222540b55480..48500864017b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -348,6 +348,7 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
 	u32 mode_to_use;
 	u64 value;
 	int ret;
+	s64 port_transmit_rate_kbps;
 
 	/* Queue 0 is not AVB capable */
 	if (queue <= 0 || queue >= tx_queues_count)
@@ -355,27 +356,24 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
 	if (!priv->dma_cap.av)
 		return -EOPNOTSUPP;
 
+	port_transmit_rate_kbps = qopt->idleslope - qopt->sendslope;
+
 	/* Port Transmit Rate and Speed Divider */
-	switch (priv->speed) {
+	switch (div_s64(port_transmit_rate_kbps, 1000)) {
 	case SPEED_10000:
 		ptr = 32;
-		speed_div = 10000000;
 		break;
 	case SPEED_5000:
 		ptr = 32;
-		speed_div = 5000000;
 		break;
 	case SPEED_2500:
 		ptr = 8;
-		speed_div = 2500000;
 		break;
 	case SPEED_1000:
 		ptr = 8;
-		speed_div = 1000000;
 		break;
 	case SPEED_100:
 		ptr = 4;
-		speed_div = 100000;
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -397,11 +395,13 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
 		priv->plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_DCB;
 	}
 
+	port_transmit_rate_kbps = qopt->idleslope - qopt->sendslope;
+
 	/* Final adjustments for HW */
-	value = div_s64(qopt->idleslope * 1024ll * ptr, speed_div);
+	value = div_s64(qopt->idleslope * 1024ll * ptr, port_transmit_rate_kbps);
 	priv->plat->tx_queues_cfg[queue].idle_slope = value & GENMASK(31, 0);
 
-	value = div_s64(-qopt->sendslope * 1024ll * ptr, speed_div);
+	value = div_s64(-qopt->sendslope * 1024ll * ptr, port_transmit_rate_kbps);
 	priv->plat->tx_queues_cfg[queue].send_slope = value & GENMASK(31, 0);
 
 	value = qopt->hicredit * 1024ll * 8;
-- 
2.25.1