[PATCH net-next] net: stmmac: stm32: Set TSO/TBS Tx queues default settings

[PATCH net-next] net: stmmac: stm32: Set TSO/TBS Tx queues default settings

[Kurt Kanzenbach]

TSO and TBS cannot coexist. Use the first queue with TSO and the rest for
TBS. Tx queues with TBS can support etf qdisc hw offload. This is done
similar to dwmac-imx and dwmac-intel.

Tested on stm32mp257f-dk with AF_XDP and Tx Launch Time on queue 1.

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index e1b260ed4790..8e15094eeab9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -557,6 +557,12 @@ static int stm32_dwmac_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	/* Default TX Q0 to use TSO and rest TXQ for TBS */
+	if (dwmac->ops->is_mp2) {
+		for (int i = 1; i < plat_dat->tx_queues_to_use; i++)
+			plat_dat->tx_queues_cfg[i].tbs_en = 1;
+	}
+
 	plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP;
 	plat_dat->bsp_priv = dwmac;
 	plat_dat->suspend = stm32_dwmac_suspend;

---
base-commit: ac155a26750a595703e7dadff84735456d75a479
change-id: 20260811-stm32mp2_txtime-6bf9e01c968e

Best regards,
--  
Kurt Kanzenbach <kurt@linutronix.de>

Re: [PATCH net-next] net: stmmac: stm32: Set TSO/TBS Tx queues default settings

[Jakub Kicinski]

On Wed, 12 Aug 2026 08:28:57 +0200 Kurt Kanzenbach wrote:
> TSO and TBS cannot coexist. Use the first queue with TSO and the rest for
> TBS. Tx queues with TBS can support etf qdisc hw offload. This is done
> similar to dwmac-imx and dwmac-intel.

Can you explain your use case? And how many queues the device has 
in total?

You say "TSO and TBS cannot coexist" but can any queue on your
platform be configured to support either feature? If yes why are
we configuring this statically instead of making appropriate
configuration based on qdisc or some other uAPI knob?