net: stmmac: dwmac-imx: Time Based Scheduling support

This small patch series allows using TBS support of the i.MX Ethernet QOS controller for etf qdisc offload.
It achieves this in a similar manner that it is done in dwmac-intel.c, dwmac-mediatek.c and stmmac_pci.c.

Changes since v1:

- Simplified for loop by starting at index 1.
- Fixed problem with indentation.

Esben Haabendal (2):
net: stmmac: do not clear TBS enable bit on link up/down
net: stmmac: dwmac-imx: set TSO/TBS TX queues default settings

 drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c   | 4 ++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
 2 files changed, 7 insertions(+)

2.43.0

With the dma conf being reallocated on each call to stmmac_open(), any information in there is lost, unless we specifically handle it.

The STMMAC_TBS_EN bit is set when adding an etf qdisc, and the etf qdisc therefore would stop working when link was set down and then back up.

---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
 1 file changed, 3 insertions(+)

index b334eb16da23..25519952f754 100644
@@ -3932,6 +3932,9 @@ static int __stmmac_open(struct net_device *dev,
 	priv->rx_copybreak = STMMAC_RX_COPYBREAK;
 
 	buf_sz = dma_conf->dma_buf_sz;
+	for (int i = 0; i < MTL_MAX_TX_QUEUES; i++)
+		if (priv->dma_conf.tx_queue[i].tbs & STMMAC_TBS_EN)
+			dma_conf->tx_queue[i].tbs = priv->dma_conf.tx_queue[i].tbs;
 	memcpy(&priv->dma_conf, dma_conf, sizeof(*dma_conf));
 
 	stmmac_reset_queues_param(priv);

2.43.0

TSO and TBS cannot coexist. For now we set i.MX Ethernet QOS controller to use the first TX queue with TSO and the rest for TBS.

TX queues with TBS can support etf qdisc hw offload.

---
 drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c | 4 ++++
 1 file changed, 4 insertions(+)

index 8f730ada71f9..6b65420e11b5 100644
@@ -353,6 +353,10 @@ static int imx_dwmac_probe(struct platform_device *pdev)
 	if (data->flags & STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY)
 		plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY;
 
+	/* Default TX Q0 to use TSO and rest TXQ for TBS */
+	for (int i = 1; i < plat_dat->tx_queues_to_use; i++)
+		plat_dat->tx_queues_cfg[i].tbs_en = 1;
+
 	plat_dat->host_dma_width = dwmac->ops->addr_width;
 	plat_dat->init = imx_dwmac_init;
 	plat_dat->exit = imx_dwmac_exit;

2.43.0

Thanks for fixing this,