kernel: fix mtk_eth_soc throughput regressions on gigabit PHY ports

Fixes issues on MT7621 and MT7623 switch ports, and PHY ports on all SoC

Signed-off-by: Felix Fietkau <nbd@nbd.name>

9 files changed, 99 insertions, 26 deletions

diff --git a/target/linux/generic/backport-5.15/730-18-v6.3-net-ethernet-mtk_eth_soc-fix-tx-throughput-regressio.patch b/target/linux/generic/backport-5.15/730-18-v6.3-net-ethernet-mtk_eth_soc-fix-tx-throughput-regressio.patch
new file mode 100644
index 0000000000..e633f6f1fb
--- /dev/null
+++ b/target/linux/generic/backport-5.15/730-18-v6.3-net-ethernet-mtk_eth_soc-fix-tx-throughput-regressio.patch
@@ -0,0 +1,31 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 24 Mar 2023 14:56:58 +0100
+Subject: [PATCH] net: ethernet: mtk_eth_soc: fix tx throughput regression with
+ direct 1G links
+
+Using the QDMA tx scheduler to throttle tx to line speed works fine for
+switch ports, but apparently caused a regression on non-switch ports.
+
+Based on a number of tests, it seems that this throttling can be safely
+dropped without re-introducing the issues on switch ports that the
+tx scheduling changes resolved.
+
+Link: https://lore.kernel.org/netdev/trinity-92c3826f-c2c8-40af-8339-bc6d0d3ffea4-1678213958520@3c-app-gmx-bs16/
+Fixes: f63959c7eec3 ("net: ethernet: mtk_eth_soc: implement multi-queue support for per-port queues")
+Reported-by: Frank Wunderlich <frank-w@public-files.de>
+Reported-by: Daniel Golle <daniel@makrotopia.org>
+Tested-by: Daniel Golle <daniel@makrotopia.org>
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -676,8 +676,6 @@ static void mtk_mac_link_up(struct phyli
+ 		break;
+ 	}
+ 
+-	mtk_set_queue_speed(mac->hw, mac->id, speed);
+-
+ 	/* Configure duplex */
+ 	if (duplex == DUPLEX_FULL)
+ 		mcr |= MAC_MCR_FORCE_DPX;
diff --git a/target/linux/generic/backport-5.15/733-v6.3-18-net-ethernet-mtk_eth_soc-add-support-for-MT7981.patch b/target/linux/generic/backport-5.15/733-v6.3-18-net-ethernet-mtk_eth_soc-add-support-for-MT7981.patch
index bfa0df3053..066b70c5e2 100644
--- a/target/linux/generic/backport-5.15/733-v6.3-18-net-ethernet-mtk_eth_soc-add-support-for-MT7981.patch
+++ b/target/linux/generic/backport-5.15/733-v6.3-18-net-ethernet-mtk_eth_soc-add-support-for-MT7981.patch
@@ -34,7 +34,7 @@
  		mtk_eth_path_name(path), __func__, updated);
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
-@@ -4757,6 +4757,26 @@ static const struct mtk_soc_data mt7629_
+@@ -4755,6 +4755,26 @@ static const struct mtk_soc_data mt7629_
  	},
  };
  
@@ -61,7 +61,7 @@
  static const struct mtk_soc_data mt7986_data = {
  	.reg_map = &mt7986_reg_map,
  	.ana_rgc3 = 0x128,
-@@ -4799,6 +4819,7 @@ const struct of_device_id of_mtk_match[]
+@@ -4797,6 +4817,7 @@ const struct of_device_id of_mtk_match[]
  	{ .compatible = "mediatek,mt7622-eth", .data = &mt7622_data},
  	{ .compatible = "mediatek,mt7623-eth", .data = &mt7623_data},
  	{ .compatible = "mediatek,mt7629-eth", .data = &mt7629_data},
diff --git a/target/linux/generic/backport-5.15/733-v6.3-19-net-ethernet-mtk_eth_soc-set-MDIO-bus-clock-frequenc.patch b/target/linux/generic/backport-5.15/733-v6.3-19-net-ethernet-mtk_eth_soc-set-MDIO-bus-clock-frequenc.patch
index df7ee081f7..9def19d67e 100644
--- a/target/linux/generic/backport-5.15/733-v6.3-19-net-ethernet-mtk_eth_soc-set-MDIO-bus-clock-frequenc.patch
+++ b/target/linux/generic/backport-5.15/733-v6.3-19-net-ethernet-mtk_eth_soc-set-MDIO-bus-clock-frequenc.patch
@@ -21,7 +21,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
-@@ -704,8 +704,10 @@ static const struct phylink_mac_ops mtk_
+@@ -702,8 +702,10 @@ static const struct phylink_mac_ops mtk_
  
  static int mtk_mdio_init(struct mtk_eth *eth)
  {
@@ -32,7 +32,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  
  	mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus");
  	if (!mii_np) {
-@@ -731,6 +733,25 @@ static int mtk_mdio_init(struct mtk_eth
+@@ -729,6 +731,25 @@ static int mtk_mdio_init(struct mtk_eth
  	eth->mii_bus->parent = eth->dev;
  
  	snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%pOFn", mii_np);
diff --git a/target/linux/generic/backport-5.15/733-v6.3-20-net-ethernet-mtk_eth_soc-switch-to-external-PCS-driv.patch b/target/linux/generic/backport-5.15/733-v6.3-20-net-ethernet-mtk_eth_soc-switch-to-external-PCS-driv.patch
index 1eca7dfeaf..203c5dc48b 100644
--- a/target/linux/generic/backport-5.15/733-v6.3-20-net-ethernet-mtk_eth_soc-switch-to-external-PCS-driv.patch
+++ b/target/linux/generic/backport-5.15/733-v6.3-20-net-ethernet-mtk_eth_soc-switch-to-external-PCS-driv.patch
@@ -60,7 +60,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  	}
  
  	return NULL;
-@@ -3979,8 +3980,17 @@ static int mtk_unreg_dev(struct mtk_eth
+@@ -3977,8 +3978,17 @@ static int mtk_unreg_dev(struct mtk_eth
  	return 0;
  }
  
@@ -78,7 +78,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  	mtk_unreg_dev(eth);
  	mtk_free_dev(eth);
  	cancel_work_sync(&eth->pending_work);
-@@ -4410,6 +4420,36 @@ void mtk_eth_set_dma_device(struct mtk_e
+@@ -4408,6 +4418,36 @@ void mtk_eth_set_dma_device(struct mtk_e
  	rtnl_unlock();
  }
  
@@ -115,7 +115,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  static int mtk_probe(struct platform_device *pdev)
  {
  	struct resource *res = NULL;
-@@ -4473,13 +4513,7 @@ static int mtk_probe(struct platform_dev
+@@ -4471,13 +4511,7 @@ static int mtk_probe(struct platform_dev
  	}
  
  	if (MTK_HAS_CAPS(eth->soc->caps, MTK_SGMII)) {
@@ -130,7 +130,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  
  		if (err)
  			return err;
-@@ -4490,14 +4524,17 @@ static int mtk_probe(struct platform_dev
+@@ -4488,14 +4522,17 @@ static int mtk_probe(struct platform_dev
  							    "mediatek,pctl");
  		if (IS_ERR(eth->pctl)) {
  			dev_err(&pdev->dev, "no pctl regmap found\n");
@@ -151,7 +151,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  	}
  
  	if (eth->soc->offload_version) {
-@@ -4657,6 +4694,8 @@ err_deinit_hw:
+@@ -4655,6 +4692,8 @@ err_deinit_hw:
  	mtk_hw_deinit(eth);
  err_wed_exit:
  	mtk_wed_exit();
diff --git a/target/linux/generic/pending-5.15/702-net-ethernet-mtk_eth_soc-enable-threaded-NAPI.patch b/target/linux/generic/pending-5.15/702-net-ethernet-mtk_eth_soc-enable-threaded-NAPI.patch
index 5dcbc6c46a..a4e3d26503 100644
--- a/target/linux/generic/pending-5.15/702-net-ethernet-mtk_eth_soc-enable-threaded-NAPI.patch
+++ b/target/linux/generic/pending-5.15/702-net-ethernet-mtk_eth_soc-enable-threaded-NAPI.patch
@@ -10,7 +10,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
-@@ -2994,8 +2994,8 @@ static irqreturn_t mtk_handle_irq_rx(int
+@@ -2992,8 +2992,8 @@ static irqreturn_t mtk_handle_irq_rx(int
  
  	eth->rx_events++;
  	if (likely(napi_schedule_prep(&eth->rx_napi))) {
@@ -20,7 +20,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	}
  
  	return IRQ_HANDLED;
-@@ -3007,8 +3007,8 @@ static irqreturn_t mtk_handle_irq_tx(int
+@@ -3005,8 +3005,8 @@ static irqreturn_t mtk_handle_irq_tx(int
  
  	eth->tx_events++;
  	if (likely(napi_schedule_prep(&eth->tx_napi))) {
@@ -30,7 +30,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	}
  
  	return IRQ_HANDLED;
-@@ -4675,6 +4675,8 @@ static int mtk_probe(struct platform_dev
+@@ -4673,6 +4673,8 @@ static int mtk_probe(struct platform_dev
  	 * for NAPI to work
  	 */
  	init_dummy_netdev(&eth->dummy_dev);
diff --git a/target/linux/generic/pending-5.15/731-net-ethernet-mediatek-ppe-add-support-for-flow-accou.patch b/target/linux/generic/pending-5.15/731-net-ethernet-mediatek-ppe-add-support-for-flow-accou.patch
index c7e1d3f6f0..6ca33152fc 100644
--- a/target/linux/generic/pending-5.15/731-net-ethernet-mediatek-ppe-add-support-for-flow-accou.patch
+++ b/target/linux/generic/pending-5.15/731-net-ethernet-mediatek-ppe-add-support-for-flow-accou.patch
@@ -53,7 +53,7 @@ v2: fix wrong variable name in return value check spotted by Denis Kirjanov
 
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
-@@ -4644,8 +4644,8 @@ static int mtk_probe(struct platform_dev
+@@ -4642,8 +4642,8 @@ static int mtk_probe(struct platform_dev
  		for (i = 0; i < num_ppe; i++) {
  			u32 ppe_addr = eth->soc->reg_map->ppe_base + i * 0x400;
  
@@ -64,7 +64,7 @@ v2: fix wrong variable name in return value check spotted by Denis Kirjanov
  			if (!eth->ppe[i]) {
  				err = -ENOMEM;
  				goto err_free_dev;
-@@ -4772,6 +4772,7 @@ static const struct mtk_soc_data mt7622_
+@@ -4770,6 +4770,7 @@ static const struct mtk_soc_data mt7622_
  	.required_pctl = false,
  	.offload_version = 2,
  	.hash_offset = 2,
@@ -72,7 +72,7 @@ v2: fix wrong variable name in return value check spotted by Denis Kirjanov
  	.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
  	.txrx = {
  		.txd_size = sizeof(struct mtk_tx_dma),
-@@ -4809,6 +4810,7 @@ static const struct mtk_soc_data mt7629_
+@@ -4807,6 +4808,7 @@ static const struct mtk_soc_data mt7629_
  	.hw_features = MTK_HW_FEATURES,
  	.required_clks = MT7629_CLKS_BITMAP,
  	.required_pctl = false,
@@ -80,7 +80,7 @@ v2: fix wrong variable name in return value check spotted by Denis Kirjanov
  	.txrx = {
  		.txd_size = sizeof(struct mtk_tx_dma),
  		.rxd_size = sizeof(struct mtk_rx_dma),
-@@ -4829,6 +4831,7 @@ static const struct mtk_soc_data mt7981_
+@@ -4827,6 +4829,7 @@ static const struct mtk_soc_data mt7981_
  	.offload_version = 2,
  	.hash_offset = 4,
  	.foe_entry_size = sizeof(struct mtk_foe_entry),
diff --git a/target/linux/generic/pending-5.15/732-00-net-ethernet-mtk_eth_soc-drop-generic-vlan-rx-offloa.patch b/target/linux/generic/pending-5.15/732-00-net-ethernet-mtk_eth_soc-drop-generic-vlan-rx-offloa.patch
index b5e118f9fa..35b296a255 100644
--- a/target/linux/generic/pending-5.15/732-00-net-ethernet-mtk_eth_soc-drop-generic-vlan-rx-offloa.patch
+++ b/target/linux/generic/pending-5.15/732-00-net-ethernet-mtk_eth_soc-drop-generic-vlan-rx-offloa.patch
@@ -17,7 +17,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
-@@ -1852,9 +1852,7 @@ static int mtk_poll_rx(struct napi_struc
+@@ -1850,9 +1850,7 @@ static int mtk_poll_rx(struct napi_struc
  
  	while (done < budget) {
  		unsigned int pktlen, *rxdcsum;
@@ -27,7 +27,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  		dma_addr_t dma_addr;
  		u32 hash, reason;
  		int mac = 0;
-@@ -1989,36 +1987,21 @@ static int mtk_poll_rx(struct napi_struc
+@@ -1987,36 +1985,21 @@ static int mtk_poll_rx(struct napi_struc
  			skb_checksum_none_assert(skb);
  		skb->protocol = eth_type_trans(skb, netdev);
  
@@ -70,7 +70,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  		skb_record_rx_queue(skb, 0);
  		napi_gro_receive(napi, skb);
  
-@@ -2833,29 +2816,11 @@ static netdev_features_t mtk_fix_feature
+@@ -2831,29 +2814,11 @@ static netdev_features_t mtk_fix_feature
  
  static int mtk_set_features(struct net_device *dev, netdev_features_t features)
  {
@@ -100,7 +100,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	return 0;
  }
  
-@@ -3169,30 +3134,6 @@ static int mtk_open(struct net_device *d
+@@ -3167,30 +3132,6 @@ static int mtk_open(struct net_device *d
  	struct mtk_eth *eth = mac->hw;
  	int i, err;
  
@@ -131,7 +131,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	err = phylink_of_phy_connect(mac->phylink, mac->of_node, 0);
  	if (err) {
  		netdev_err(dev, "%s: could not attach PHY: %d\n", __func__,
-@@ -3233,6 +3174,35 @@ static int mtk_open(struct net_device *d
+@@ -3231,6 +3172,35 @@ static int mtk_open(struct net_device *d
  	phylink_start(mac->phylink);
  	netif_tx_start_all_queues(dev);
  
@@ -167,7 +167,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	return 0;
  }
  
-@@ -3717,10 +3687,9 @@ static int mtk_hw_init(struct mtk_eth *e
+@@ -3715,10 +3685,9 @@ static int mtk_hw_init(struct mtk_eth *e
  	if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
  		val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
  		mtk_w32(eth, val | MTK_CDMP_STAG_EN, MTK_CDMP_IG_CTRL);
@@ -180,7 +180,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  	/* set interrupt delays based on current Net DIM sample */
  	mtk_dim_rx(&eth->rx_dim.work);
-@@ -4367,7 +4336,7 @@ static int mtk_add_mac(struct mtk_eth *e
+@@ -4365,7 +4334,7 @@ static int mtk_add_mac(struct mtk_eth *e
  		eth->netdev[id]->hw_features |= NETIF_F_LRO;
  
  	eth->netdev[id]->vlan_features = eth->soc->hw_features &
diff --git a/target/linux/generic/pending-5.15/732-01-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch b/target/linux/generic/pending-5.15/732-01-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch
index 72bad79c13..fbf0cb5735 100644
--- a/target/linux/generic/pending-5.15/732-01-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch
+++ b/target/linux/generic/pending-5.15/732-01-net-ethernet-mtk_eth_soc-work-around-issue-with-send.patch
@@ -16,7 +16,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
-@@ -1425,12 +1425,28 @@ static void mtk_wake_queue(struct mtk_et
+@@ -1423,12 +1423,28 @@ static void mtk_wake_queue(struct mtk_et
  	}
  }
  
@@ -45,7 +45,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	bool gso = false;
  	int tx_num;
  
-@@ -1452,6 +1468,18 @@ static netdev_tx_t mtk_start_xmit(struct
+@@ -1450,6 +1466,18 @@ static netdev_tx_t mtk_start_xmit(struct
  		return NETDEV_TX_BUSY;
  	}
  
@@ -64,7 +64,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	/* TSO: fill MSS info in tcp checksum field */
  	if (skb_is_gso(skb)) {
  		if (skb_cow_head(skb, 0)) {
-@@ -1467,8 +1495,14 @@ static netdev_tx_t mtk_start_xmit(struct
+@@ -1465,8 +1493,14 @@ static netdev_tx_t mtk_start_xmit(struct
  		}
  	}
  
diff --git a/target/linux/generic/pending-5.15/732-03-net-ethernet-mtk_eth_soc-fix-remaining-throughput-re.patch b/target/linux/generic/pending-5.15/732-03-net-ethernet-mtk_eth_soc-fix-remaining-throughput-re.patch
new file mode 100644
index 0000000000..0aa9382b6b
--- /dev/null
+++ b/target/linux/generic/pending-5.15/732-03-net-ethernet-mtk_eth_soc-fix-remaining-throughput-re.patch
@@ -0,0 +1,42 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Wed, 29 Mar 2023 16:02:54 +0200
+Subject: [PATCH] net: ethernet: mtk_eth_soc: fix remaining throughput
+ regression
+
+Based on further tests, it seems that the QDMA shaper is not able to
+perform shaping close to the MAC link rate without throughput loss.
+This cannot be compensated by increasing the shaping rate, so it seems
+to be an internal limit.
+
+Fix the remaining throughput regression by detecting that condition and
+limiting shaping to ports with lower link speed.
+
+This patch intentionally ignores link speed gain from TRGMII, because
+even on such links, shaping to 1000 Mbit/s incurs some throughput
+degradation.
+
+Fixes: f63959c7eec3 ("net: ethernet: mtk_eth_soc: implement multi-queue support for per-port queues")
+Reported-by: Frank Wunderlich <frank-w@public-files.de>
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -667,6 +667,7 @@ static void mtk_mac_link_up(struct phyli
+ 		 MAC_MCR_FORCE_RX_FC);
+ 
+ 	/* Configure speed */
++	mac->speed = speed;
+ 	switch (speed) {
+ 	case SPEED_2500:
+ 	case SPEED_1000:
+@@ -3145,6 +3146,9 @@ found:
+ 	if (dp->index >= MTK_QDMA_NUM_QUEUES)
+ 		return NOTIFY_DONE;
+ 
++	if (mac->speed > 0 && mac->speed <= s.base.speed)
++		s.base.speed = 0;
++
+ 	mtk_set_queue_speed(eth, dp->index + 3, s.base.speed);
+ 
+ 	return NOTIFY_DONE;