ramips/mediatek: improve GRO performance, fix PPE packet parsing

Backport upstream changes to initialize GDM settings and reset PPE
Allow GMAC to recognize the special tag to fix PPE packet parsing
Improve GRO performance by passing PPE L4 hash as skb hash

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

6 files changed, 112 insertions, 14 deletions

diff --git a/target/linux/generic/pending-5.4/770-02-net-ethernet-mtk_eth_soc-fix-rx-vlan-offload.patch b/target/linux/generic/pending-5.4/770-02-net-ethernet-mtk_eth_soc-fix-rx-vlan-offload.patch
index 899bc41c93..e17877028f 100644
--- a/target/linux/generic/pending-5.4/770-02-net-ethernet-mtk_eth_soc-fix-rx-vlan-offload.patch
+++ b/target/linux/generic/pending-5.4/770-02-net-ethernet-mtk_eth_soc-fix-rx-vlan-offload.patch
@@ -21,7 +21,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  		skb_record_rx_queue(skb, 0);
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
-@@ -293,6 +293,7 @@
+@@ -295,6 +295,7 @@
  #define RX_DMA_LSO		BIT(30)
  #define RX_DMA_PLEN0(_x)	(((_x) & 0x3fff) << 16)
  #define RX_DMA_GET_PLEN0(_x)	(((_x) >> 16) & 0x3fff)
diff --git a/target/linux/generic/pending-5.4/770-04-net-ethernet-mtk_eth_soc-use-larger-burst-size-for-q.patch b/target/linux/generic/pending-5.4/770-04-net-ethernet-mtk_eth_soc-use-larger-burst-size-for-q.patch
index b066d35d2e..e135f27f95 100644
--- a/target/linux/generic/pending-5.4/770-04-net-ethernet-mtk_eth_soc-use-larger-burst-size-for-q.patch
+++ b/target/linux/generic/pending-5.4/770-04-net-ethernet-mtk_eth_soc-use-larger-burst-size-for-q.patch
@@ -21,7 +21,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  			MTK_QDMA_GLO_CFG);
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
-@@ -195,7 +195,7 @@
+@@ -197,7 +197,7 @@
  #define MTK_RX_BT_32DWORDS	(3 << 11)
  #define MTK_NDP_CO_PRO		BIT(10)
  #define MTK_TX_WB_DDONE		BIT(6)
diff --git a/target/linux/generic/pending-5.4/770-06-net-ethernet-mtk_eth_soc-implement-dynamic-interrupt.patch b/target/linux/generic/pending-5.4/770-06-net-ethernet-mtk_eth_soc-implement-dynamic-interrupt.patch
index 4372029423..8720ab503c 100644
--- a/target/linux/generic/pending-5.4/770-06-net-ethernet-mtk_eth_soc-implement-dynamic-interrupt.patch
+++ b/target/linux/generic/pending-5.4/770-06-net-ethernet-mtk_eth_soc-implement-dynamic-interrupt.patch
@@ -95,7 +95,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	if (likely(napi_schedule_prep(&eth->tx_napi))) {
  		__napi_schedule(&eth->tx_napi);
  		mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
-@@ -2282,6 +2299,9 @@ static int mtk_stop(struct net_device *d
+@@ -2311,6 +2328,9 @@ static int mtk_stop(struct net_device *d
  	napi_disable(&eth->tx_napi);
  	napi_disable(&eth->rx_napi);
  
@@ -105,7 +105,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
  		mtk_stop_dma(eth, MTK_QDMA_GLO_CFG);
  	mtk_stop_dma(eth, MTK_PDMA_GLO_CFG);
-@@ -2331,6 +2351,64 @@ err_disable_clks:
+@@ -2360,6 +2380,64 @@ err_disable_clks:
  	return ret;
  }
  
@@ -170,7 +170,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  static int mtk_hw_init(struct mtk_eth *eth)
  {
  	int i, val, ret;
-@@ -2352,9 +2430,6 @@ static int mtk_hw_init(struct mtk_eth *e
+@@ -2381,9 +2459,6 @@ static int mtk_hw_init(struct mtk_eth *e
  			goto err_disable_pm;
  		}
  
@@ -180,7 +180,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  		/* disable delay and normal interrupt */
  		mtk_tx_irq_disable(eth, ~0);
  		mtk_rx_irq_disable(eth, ~0);
-@@ -2393,11 +2468,10 @@ static int mtk_hw_init(struct mtk_eth *e
+@@ -2422,11 +2497,10 @@ static int mtk_hw_init(struct mtk_eth *e
  	/* Enable RX VLan Offloading */
  	mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
  
@@ -193,8 +193,8 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 -	mtk_w32(eth, 0, MTK_QDMA_DELAY_INT);
  	mtk_tx_irq_disable(eth, ~0);
  	mtk_rx_irq_disable(eth, ~0);
- 	mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);
-@@ -2916,6 +2990,13 @@ static int mtk_probe(struct platform_dev
+ 
+@@ -2930,6 +3004,13 @@ static int mtk_probe(struct platform_dev
  	spin_lock_init(&eth->page_lock);
  	spin_lock_init(&eth->tx_irq_lock);
  	spin_lock_init(&eth->rx_irq_lock);
@@ -218,7 +218,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  #define MTK_QDMA_PAGE_SIZE	2048
  #define	MTK_MAX_RX_LENGTH	1536
-@@ -129,13 +130,18 @@
+@@ -131,13 +132,18 @@
  
  /* PDMA Delay Interrupt Register */
  #define MTK_PDMA_DELAY_INT		0xa0c
@@ -242,7 +242,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  /* PDMA Interrupt Status Register */
  #define MTK_PDMA_INT_STATUS	0xa20
-@@ -217,6 +223,7 @@
+@@ -219,6 +225,7 @@
  /* QDMA Interrupt Status Register */
  #define MTK_QDMA_INT_STATUS	0x1A18
  #define MTK_RX_DONE_DLY		BIT(30)
@@ -250,7 +250,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  #define MTK_RX_DONE_INT3	BIT(19)
  #define MTK_RX_DONE_INT2	BIT(18)
  #define MTK_RX_DONE_INT1	BIT(17)
-@@ -226,8 +233,7 @@
+@@ -228,8 +235,7 @@
  #define MTK_TX_DONE_INT1	BIT(1)
  #define MTK_TX_DONE_INT0	BIT(0)
  #define MTK_RX_DONE_INT		MTK_RX_DONE_DLY
@@ -260,7 +260,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  /* QDMA Interrupt grouping registers */
  #define MTK_QDMA_INT_GRP1	0x1a20
-@@ -890,6 +896,18 @@ struct mtk_eth {
+@@ -892,6 +898,18 @@ struct mtk_eth {
  
  	const struct mtk_soc_data	*soc;
  
diff --git a/target/linux/generic/pending-5.4/770-08-net-ethernet-mtk_eth_soc-cache-hardware-pointer-of-l.patch b/target/linux/generic/pending-5.4/770-08-net-ethernet-mtk_eth_soc-cache-hardware-pointer-of-l.patch
index 29dfd932e7..a7231d826c 100644
--- a/target/linux/generic/pending-5.4/770-08-net-ethernet-mtk_eth_soc-cache-hardware-pointer-of-l.patch
+++ b/target/linux/generic/pending-5.4/770-08-net-ethernet-mtk_eth_soc-cache-hardware-pointer-of-l.patch
@@ -49,7 +49,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	} else {
 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
-@@ -622,6 +622,7 @@ struct mtk_tx_buf {
+@@ -624,6 +624,7 @@ struct mtk_tx_buf {
   * @phys:		The physical addr of tx_buf
   * @next_free:		Pointer to the next free descriptor
   * @last_free:		Pointer to the last free descriptor
@@ -57,7 +57,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
   * @thresh:		The threshold of minimum amount of free descriptors
   * @free_count:		QDMA uses a linked list. Track how many free descriptors
   *			are present
-@@ -632,6 +633,7 @@ struct mtk_tx_ring {
+@@ -634,6 +635,7 @@ struct mtk_tx_ring {
  	dma_addr_t phys;
  	struct mtk_tx_dma *next_free;
  	struct mtk_tx_dma *last_free;
diff --git a/target/linux/generic/pending-5.4/770-13-net-ethernet-mtk_eth_soc-fix-parsing-packets-in-GDM.patch b/target/linux/generic/pending-5.4/770-13-net-ethernet-mtk_eth_soc-fix-parsing-packets-in-GDM.patch
new file mode 100644
index 0000000000..36a52bbc06
--- /dev/null
+++ b/target/linux/generic/pending-5.4/770-13-net-ethernet-mtk_eth_soc-fix-parsing-packets-in-GDM.patch
@@ -0,0 +1,75 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sun, 13 Sep 2020 08:17:02 +0200
+Subject: [PATCH] net: ethernet: mtk_eth_soc: fix parsing packets in GDM
+
+When using DSA, set the special tag in GDM ingress control to allow the MAC
+to parse packets properly earlier. This affects rx DMA source port reporting.
+
+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
+@@ -19,6 +19,7 @@
+ #include <linux/interrupt.h>
+ #include <linux/pinctrl/devinfo.h>
+ #include <linux/phylink.h>
++#include <net/dsa.h>
+ 
+ #include "mtk_eth_soc.h"
+ 
+@@ -1240,12 +1241,14 @@ static int mtk_poll_rx(struct napi_struc
+ 	u8 *data, *new_data;
+ 	struct mtk_rx_dma *rxd, trxd;
+ 	int done = 0, bytes = 0;
++	bool uses_dsa = eth->netdev[0] && netdev_uses_dsa(eth->netdev[0]);
+ 
+ 	while (done < budget) {
+ 		struct net_device *netdev;
+ 		unsigned int pktlen;
+ 		dma_addr_t dma_addr;
+ 		int mac;
++		u16 hash;
+ 
+ 		ring = mtk_get_rx_ring(eth);
+ 		if (unlikely(!ring))
+@@ -1259,13 +1262,13 @@ static int mtk_poll_rx(struct napi_struc
+ 			break;
+ 
+ 		/* find out which mac the packet come from. values start at 1 */
+-		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628)) {
++		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
+ 			mac = 0;
+-		} else {
+-			mac = (trxd.rxd4 >> RX_DMA_FPORT_SHIFT) &
+-				RX_DMA_FPORT_MASK;
+-			mac--;
+-		}
++		else if (uses_dsa)
++			mac = !(trxd.rxd4 >> 22);
++		else
++			mac = ((trxd.rxd4 >> RX_DMA_FPORT_SHIFT) &
++			       RX_DMA_FPORT_MASK) - 1;
+ 
+ 		if (unlikely(mac < 0 || mac >= MTK_MAC_COUNT ||
+ 			     !eth->netdev[mac]))
+@@ -2247,6 +2250,9 @@ static void mtk_gdm_config(struct mtk_et
+ 
+ 		val |= config;
+ 
++		if (!i && eth->netdev[0] && netdev_uses_dsa(eth->netdev[0]))
++			val |= MTK_GDMA_SPECIAL_TAG;
++
+ 		mtk_w32(eth, val, MTK_GDMA_FWD_CFG(i));
+ 	}
+ 	/* Reset and enable PSE */
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+@@ -82,6 +82,7 @@
+ 
+ /* GDM Exgress Control Register */
+ #define MTK_GDMA_FWD_CFG(x)	(0x500 + (x * 0x1000))
++#define MTK_GDMA_SPECIAL_TAG	BIT(24)
+ #define MTK_GDMA_ICS_EN		BIT(22)
+ #define MTK_GDMA_TCS_EN		BIT(21)
+ #define MTK_GDMA_UCS_EN		BIT(20)
diff --git a/target/linux/generic/pending-5.4/770-14-net-ethernet-mtk_eth_soc-set-PPE-flow-hash-as-skb-ha.patch b/target/linux/generic/pending-5.4/770-14-net-ethernet-mtk_eth_soc-set-PPE-flow-hash-as-skb-ha.patch
new file mode 100644
index 0000000000..384af9d21d
--- /dev/null
+++ b/target/linux/generic/pending-5.4/770-14-net-ethernet-mtk_eth_soc-set-PPE-flow-hash-as-skb-ha.patch
@@ -0,0 +1,23 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sun, 13 Sep 2020 08:27:24 +0200
+Subject: [PATCH] net: ethernet: mtk_eth_soc: set PPE flow hash as skb hash
+ if present
+
+This improves GRO performance
+
+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
+@@ -1318,6 +1318,10 @@ static int mtk_poll_rx(struct napi_struc
+ 		skb->protocol = eth_type_trans(skb, netdev);
+ 		bytes += pktlen;
+ 
++		hash = trxd.rxd4 & GENMASK(13, 0);
++		if (hash != GENMASK(13, 0))
++			skb_set_hash(skb, hash, PKT_HASH_TYPE_L4);
++
+ 		if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
+ 		    (trxd.rxd2 & RX_DMA_VTAG))
+ 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),