[net v2 PATCH] net: stmmac: No need to calculate speed divider when offload is disabled

[net v2 PATCH] net: stmmac: No need to calculate speed divider when offload is disabled

[Xiaolei Wang]

commit be27b8965297 ("net: stmmac: replace priv->speed with
the portTransmitRate from the tc-cbs parameters") introduced
a problem. When deleting, it prompts "Invalid portTransmitRate
0 (idleSlope - sendSlope)" and exits. Add judgment on cbs.enable.
Only when offload is enabled, speed divider needs to be calculated.

Fixes: be27b8965297 ("net: stmmac: replace priv->speed with the portTransmitRate from the tc-cbs parameters")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
---

Change log:

v1:
    https://patchwork.kernel.org/project/netdevbpf/patch/20240614081916.764761-1-xiaolei.wang@windriver.com/
v2:
    When offload is disabled, ptr is initialized to 0

 .../net/ethernet/stmicro/stmmac/stmmac_tc.c   | 40 ++++++++++---------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 1562fbdd0a04..996f2bcd07a2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -358,24 +358,28 @@ static int tc_setup_cbs(struct stmmac_priv *priv,
 
 	port_transmit_rate_kbps = qopt->idleslope - qopt->sendslope;
 
-	/* Port Transmit Rate and Speed Divider */
-	switch (div_s64(port_transmit_rate_kbps, 1000)) {
-	case SPEED_10000:
-	case SPEED_5000:
-		ptr = 32;
-		break;
-	case SPEED_2500:
-	case SPEED_1000:
-		ptr = 8;
-		break;
-	case SPEED_100:
-		ptr = 4;
-		break;
-	default:
-		netdev_err(priv->dev,
-			   "Invalid portTransmitRate %lld (idleSlope - sendSlope)\n",
-			   port_transmit_rate_kbps);
-		return -EINVAL;
+	if (qopt->enable) {
+		/* Port Transmit Rate and Speed Divider */
+		switch (div_s64(port_transmit_rate_kbps, 1000)) {
+		case SPEED_10000:
+		case SPEED_5000:
+			ptr = 32;
+			break;
+		case SPEED_2500:
+		case SPEED_1000:
+			ptr = 8;
+			break;
+		case SPEED_100:
+			ptr = 4;
+			break;
+		default:
+			netdev_err(priv->dev,
+				   "Invalid portTransmitRate %lld (idleSlope - sendSlope)\n",
+				   port_transmit_rate_kbps);
+			return -EINVAL;
+		}
+	} else {
+		ptr = 0;
 	}
 
 	mode_to_use = priv->plat->tx_queues_cfg[queue].mode_to_use;
-- 
2.25.1

Re: [net v2 PATCH] net: stmmac: No need to calculate speed divider when offload is disabled

[Simon Horman]

On Mon, Jun 17, 2024 at 09:39:22AM +0800, Xiaolei Wang wrote:
> commit be27b8965297 ("net: stmmac: replace priv->speed with
> the portTransmitRate from the tc-cbs parameters") introduced
> a problem. When deleting, it prompts "Invalid portTransmitRate
> 0 (idleSlope - sendSlope)" and exits. Add judgment on cbs.enable.
> Only when offload is enabled, speed divider needs to be calculated.
> 
> Fixes: be27b8965297 ("net: stmmac: replace priv->speed with the portTransmitRate from the tc-cbs parameters")
> Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
> ---
> 
> Change log:
> 
> v1:
>     https://patchwork.kernel.org/project/netdevbpf/patch/20240614081916.764761-1-xiaolei.wang@windriver.com/
> v2:
>     When offload is disabled, ptr is initialized to 0

Thanks for the update.

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [net v2 PATCH] net: stmmac: No need to calculate speed divider when offload is disabled

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 17 Jun 2024 09:39:22 +0800 you wrote:
> commit be27b8965297 ("net: stmmac: replace priv->speed with
> the portTransmitRate from the tc-cbs parameters") introduced
> a problem. When deleting, it prompts "Invalid portTransmitRate
> 0 (idleSlope - sendSlope)" and exits. Add judgment on cbs.enable.
> Only when offload is enabled, speed divider needs to be calculated.
> 
> Fixes: be27b8965297 ("net: stmmac: replace priv->speed with the portTransmitRate from the tc-cbs parameters")
> Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
> 
> [...]

Here is the summary with links:
  - [net,v2] net: stmmac: No need to calculate speed divider when offload is disabled
    https://git.kernel.org/netdev/net/c/b8c43360f6e4

You are awesome, thank you!
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