[PATCH net-next v2 00/15] mtk_eth_soc: fixes and performance improvements

[PATCH net-next v2 00/15] mtk_eth_soc: fixes and performance improvements

[Ilya Lipnitskiy]

Most of these changes come from OpenWrt where they have been present and
tested for months.

First three patches are bug fixes. The rest are performance
improvements. The last patch is a cleanup to use the iopoll.h macro for
busy-waiting instead of a custom loop.

v2:
 - Reverse christmas tree in "use iopoll.h macro for DMA init"
 - Use cond_resched() instead of iopoll.h macro in "reduce MDIO bus
   access latency"
 - Use napi_complete_done and rework NAPI callbacks in a new patch

Felix Fietkau (12):
  net: ethernet: mtk_eth_soc: fix RX VLAN offload
  net: ethernet: mtk_eth_soc: unmap RX data before calling build_skb
  net: ethernet: mtk_eth_soc: use napi_consume_skb
  net: ethernet: mtk_eth_soc: reduce MDIO bus access latency
  net: ethernet: mtk_eth_soc: remove unnecessary TX queue stops
  net: ethernet: mtk_eth_soc: use larger burst size for QDMA TX
  net: ethernet: mtk_eth_soc: increase DMA ring sizes
  net: ethernet: mtk_eth_soc: implement dynamic interrupt moderation
  net: ethernet: mtk_eth_soc: cache HW pointer of last freed TX
    descriptor
  net: ethernet: mtk_eth_soc: only read the full RX descriptor if DMA is
    done
  net: ethernet: mtk_eth_soc: reduce unnecessary interrupts
  net: ethernet: mtk_eth_soc: set PPE flow hash as skb hash if present

Ilya Lipnitskiy (3):
  net: ethernet: mtk_eth_soc: fix build_skb cleanup
  net: ethernet: mtk_eth_soc: rework NAPI callbacks
  net: ethernet: mtk_eth_soc: use iopoll.h macro for DMA init

 drivers/net/ethernet/mediatek/Kconfig       |   1 +
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 262 +++++++++++++-------
 drivers/net/ethernet/mediatek/mtk_eth_soc.h |  50 +++-
 3 files changed, 213 insertions(+), 100 deletions(-)

-- 
2.31.1

[PATCH net-next v2 01/15] net: ethernet: mtk_eth_soc: fix RX VLAN offload

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

The VLAN ID in the rx descriptor is only valid if the RX_DMA_VTAG bit is
set. Fixes frames wrongly marked with VLAN tags.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
[Ilya: fix commit message]
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +-
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 6b00c12c6c43..b2175ec451ab 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1319,7 +1319,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		skb->protocol = eth_type_trans(skb, netdev);
 
 		if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
-		    RX_DMA_VID(trxd.rxd3))
+		    (trxd.rxd2 & RX_DMA_VTAG))
 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 					       RX_DMA_VID(trxd.rxd3));
 		skb_record_rx_queue(skb, 0);
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 1a6750c08bb9..875e67b41561 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -301,6 +301,7 @@
 #define RX_DMA_LSO		BIT(30)
 #define RX_DMA_PLEN0(_x)	(((_x) & 0x3fff) << 16)
 #define RX_DMA_GET_PLEN0(_x)	(((_x) >> 16) & 0x3fff)
+#define RX_DMA_VTAG		BIT(15)
 
 /* QDMA descriptor rxd3 */
 #define RX_DMA_VID(_x)		((_x) & 0xfff)
-- 
2.31.1

[PATCH net-next v2 02/15] net: ethernet: mtk_eth_soc: unmap RX data before calling build_skb

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

Since build_skb accesses the data area (for initializing shinfo), dma unmap
needs to happen before that call

Signed-off-by: Felix Fietkau <nbd@nbd.name>
[Ilya: split build_skb cleanup fix into a separate commit]
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index b2175ec451ab..540003f3fcb8 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1298,6 +1298,9 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 			goto release_desc;
 		}
 
+		dma_unmap_single(eth->dev, trxd.rxd1,
+				 ring->buf_size, DMA_FROM_DEVICE);
+
 		/* receive data */
 		skb = build_skb(data, ring->frag_size);
 		if (unlikely(!skb)) {
@@ -1307,8 +1310,6 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		}
 		skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
 
-		dma_unmap_single(eth->dev, trxd.rxd1,
-				 ring->buf_size, DMA_FROM_DEVICE);
 		pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
 		skb->dev = netdev;
 		skb_put(skb, pktlen);
-- 
2.31.1

[PATCH net-next v2 03/15] net: ethernet: mtk_eth_soc: fix build_skb cleanup

[Ilya Lipnitskiy]

In case build_skb fails, call skb_free_frag on the correct pointer. Also
update the DMA structures with the new mapping before exiting, because
the mapping was successful

Suggested-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 540003f3fcb8..07daa5de8bec 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1304,9 +1304,9 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		/* receive data */
 		skb = build_skb(data, ring->frag_size);
 		if (unlikely(!skb)) {
-			skb_free_frag(new_data);
+			skb_free_frag(data);
 			netdev->stats.rx_dropped++;
-			goto release_desc;
+			goto skip_rx;
 		}
 		skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
 
@@ -1326,6 +1326,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		skb_record_rx_queue(skb, 0);
 		napi_gro_receive(napi, skb);
 
+skip_rx:
 		ring->data[idx] = new_data;
 		rxd->rxd1 = (unsigned int)dma_addr;
 
-- 
2.31.1

[PATCH net-next v2 04/15] net: ethernet: mtk_eth_soc: use napi_consume_skb

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

Should improve performance, since it can use bulk free

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 07daa5de8bec..5cf64de3ddf8 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -858,7 +858,8 @@ static int txd_to_idx(struct mtk_tx_ring *ring, struct mtk_tx_dma *dma)
 	return ((void *)dma - (void *)ring->dma) / sizeof(*dma);
 }
 
-static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf)
+static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf,
+			 bool napi)
 {
 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA)) {
 		if (tx_buf->flags & MTK_TX_FLAGS_SINGLE0) {
@@ -890,8 +891,12 @@ static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf)
 
 	tx_buf->flags = 0;
 	if (tx_buf->skb &&
-	    (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC))
-		dev_kfree_skb_any(tx_buf->skb);
+	    (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC)) {
+		if (napi)
+			napi_consume_skb(tx_buf->skb, napi);
+		else
+			dev_kfree_skb_any(tx_buf->skb);
+	}
 	tx_buf->skb = NULL;
 }
 
@@ -1069,7 +1074,7 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
 		tx_buf = mtk_desc_to_tx_buf(ring, itxd);
 
 		/* unmap dma */
-		mtk_tx_unmap(eth, tx_buf);
+		mtk_tx_unmap(eth, tx_buf, false);
 
 		itxd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
 		if (!MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
@@ -1388,7 +1393,7 @@ static int mtk_poll_tx_qdma(struct mtk_eth *eth, int budget,
 			done[mac]++;
 			budget--;
 		}
-		mtk_tx_unmap(eth, tx_buf);
+		mtk_tx_unmap(eth, tx_buf, true);
 
 		ring->last_free = desc;
 		atomic_inc(&ring->free_count);
@@ -1425,7 +1430,7 @@ static int mtk_poll_tx_pdma(struct mtk_eth *eth, int budget,
 			budget--;
 		}
 
-		mtk_tx_unmap(eth, tx_buf);
+		mtk_tx_unmap(eth, tx_buf, true);
 
 		desc = &ring->dma[cpu];
 		ring->last_free = desc;
@@ -1627,7 +1632,7 @@ static void mtk_tx_clean(struct mtk_eth *eth)
 
 	if (ring->buf) {
 		for (i = 0; i < MTK_DMA_SIZE; i++)
-			mtk_tx_unmap(eth, &ring->buf[i]);
+			mtk_tx_unmap(eth, &ring->buf[i], false);
 		kfree(ring->buf);
 		ring->buf = NULL;
 	}
-- 
2.31.1

[PATCH net-next v2 05/15] net: ethernet: mtk_eth_soc: reduce MDIO bus access latency

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

usleep_range often ends up sleeping much longer than the 10-20us provided
as a range here. This causes significant latency in mdio bus acceses,
which easily adds multiple seconds to the boot time on MT7621 when polling
DSA slave ports.
Use cond_resched instead of usleep_range, since the MDIO access does not
take much time

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 5cf64de3ddf8..d992d4f1f400 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -86,7 +86,7 @@ static int mtk_mdio_busy_wait(struct mtk_eth *eth)
 			return 0;
 		if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
 			break;
-		usleep_range(10, 20);
+		cond_resched();
 	}
 
 	dev_err(eth->dev, "mdio: MDIO timeout\n");
-- 
2.31.1

[PATCH net-next v2 06/15] net: ethernet: mtk_eth_soc: remove unnecessary TX queue stops

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

When running short on descriptors, only stop the queue for the netdev that
tx was attempted for. By the time something tries to send on the other
netdev, the ring might have some more room already.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index d992d4f1f400..e6f832dde9a6 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1131,17 +1131,6 @@ static void mtk_wake_queue(struct mtk_eth *eth)
 	}
 }
 
-static void mtk_stop_queue(struct mtk_eth *eth)
-{
-	int i;
-
-	for (i = 0; i < MTK_MAC_COUNT; i++) {
-		if (!eth->netdev[i])
-			continue;
-		netif_stop_queue(eth->netdev[i]);
-	}
-}
-
 static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct mtk_mac *mac = netdev_priv(dev);
@@ -1162,7 +1151,7 @@ static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	tx_num = mtk_cal_txd_req(skb);
 	if (unlikely(atomic_read(&ring->free_count) <= tx_num)) {
-		mtk_stop_queue(eth);
+		netif_stop_queue(dev);
 		netif_err(eth, tx_queued, dev,
 			  "Tx Ring full when queue awake!\n");
 		spin_unlock(&eth->page_lock);
@@ -1188,7 +1177,7 @@ static netdev_tx_t mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		goto drop;
 
 	if (unlikely(atomic_read(&ring->free_count) <= ring->thresh))
-		mtk_stop_queue(eth);
+		netif_stop_queue(dev);
 
 	spin_unlock(&eth->page_lock);
 
-- 
2.31.1

[PATCH net-next v2 07/15] net: ethernet: mtk_eth_soc: use larger burst size for QDMA TX

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

Improves tx performance

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +-
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index e6f832dde9a6..645360cfdfe9 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2193,7 +2193,7 @@ static int mtk_start_dma(struct mtk_eth *eth)
 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA)) {
 		mtk_w32(eth,
 			MTK_TX_WB_DDONE | MTK_TX_DMA_EN |
-			MTK_DMA_SIZE_16DWORDS | MTK_NDP_CO_PRO |
+			MTK_TX_BT_32DWORDS | MTK_NDP_CO_PRO |
 			MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
 			MTK_RX_BT_32DWORDS,
 			MTK_QDMA_GLO_CFG);
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 875e67b41561..83883d86b881 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -203,7 +203,7 @@
 #define MTK_RX_BT_32DWORDS	(3 << 11)
 #define MTK_NDP_CO_PRO		BIT(10)
 #define MTK_TX_WB_DDONE		BIT(6)
-#define MTK_DMA_SIZE_16DWORDS	(2 << 4)
+#define MTK_TX_BT_32DWORDS	(3 << 4)
 #define MTK_RX_DMA_BUSY		BIT(3)
 #define MTK_TX_DMA_BUSY		BIT(1)
 #define MTK_RX_DMA_EN		BIT(2)
-- 
2.31.1

[PATCH net-next v2 08/15] net: ethernet: mtk_eth_soc: increase DMA ring sizes

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

256 descriptors is not enough for multi-gigabit traffic under load on
MT7622. Bump it to 512 to improve performance.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 83883d86b881..540a5771b7bf 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -22,7 +22,7 @@
 #define MTK_MAX_RX_LENGTH	1536
 #define MTK_MAX_RX_LENGTH_2K	2048
 #define MTK_TX_DMA_BUF_LEN	0x3fff
-#define MTK_DMA_SIZE		256
+#define MTK_DMA_SIZE		512
 #define MTK_NAPI_WEIGHT		64
 #define MTK_MAC_COUNT		2
 #define MTK_RX_ETH_HLEN		(ETH_HLEN + ETH_FCS_LEN)
-- 
2.31.1

[PATCH net-next v2 09/15] net: ethernet: mtk_eth_soc: implement dynamic interrupt moderation

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

Reduces the number of interrupts under load

Signed-off-by: Felix Fietkau <nbd@nbd.name>
[Ilya: add documentation for new struct fields]
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/Kconfig       |  1 +
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 96 +++++++++++++++++++--
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 41 +++++++--
 3 files changed, 124 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/Kconfig b/drivers/net/ethernet/mediatek/Kconfig
index 08c2e446d3d5..c357c193378e 100644
--- a/drivers/net/ethernet/mediatek/Kconfig
+++ b/drivers/net/ethernet/mediatek/Kconfig
@@ -11,6 +11,7 @@ config NET_MEDIATEK_SOC
 	tristate "MediaTek SoC Gigabit Ethernet support"
 	depends on NET_DSA || !NET_DSA
 	select PHYLINK
+	select DIMLIB
 	help
 	  This driver supports the gigabit ethernet MACs in the
 	  MediaTek SoC family.
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 645360cfdfe9..762e985fa294 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1233,12 +1233,13 @@ static void mtk_update_rx_cpu_idx(struct mtk_eth *eth)
 static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		       struct mtk_eth *eth)
 {
+	struct dim_sample dim_sample = {};
 	struct mtk_rx_ring *ring;
 	int idx;
 	struct sk_buff *skb;
 	u8 *data, *new_data;
 	struct mtk_rx_dma *rxd, trxd;
-	int done = 0;
+	int done = 0, bytes = 0;
 
 	while (done < budget) {
 		struct net_device *netdev;
@@ -1312,6 +1313,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		else
 			skb_checksum_none_assert(skb);
 		skb->protocol = eth_type_trans(skb, netdev);
+		bytes += pktlen;
 
 		if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
 		    (trxd.rxd2 & RX_DMA_VTAG))
@@ -1344,6 +1346,12 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		mtk_update_rx_cpu_idx(eth);
 	}
 
+	eth->rx_packets += done;
+	eth->rx_bytes += bytes;
+	dim_update_sample(eth->rx_events, eth->rx_packets, eth->rx_bytes,
+			  &dim_sample);
+	net_dim(&eth->rx_dim, dim_sample);
+
 	return done;
 }
 
@@ -1436,6 +1444,7 @@ static int mtk_poll_tx_pdma(struct mtk_eth *eth, int budget,
 static int mtk_poll_tx(struct mtk_eth *eth, int budget)
 {
 	struct mtk_tx_ring *ring = &eth->tx_ring;
+	struct dim_sample dim_sample = {};
 	unsigned int done[MTK_MAX_DEVS];
 	unsigned int bytes[MTK_MAX_DEVS];
 	int total = 0, i;
@@ -1453,8 +1462,14 @@ static int mtk_poll_tx(struct mtk_eth *eth, int budget)
 			continue;
 		netdev_completed_queue(eth->netdev[i], done[i], bytes[i]);
 		total += done[i];
+		eth->tx_packets += done[i];
+		eth->tx_bytes += bytes[i];
 	}
 
+	dim_update_sample(eth->tx_events, eth->tx_packets, eth->tx_bytes,
+			  &dim_sample);
+	net_dim(&eth->tx_dim, dim_sample);
+
 	if (mtk_queue_stopped(eth) &&
 	    (atomic_read(&ring->free_count) > ring->thresh))
 		mtk_wake_queue(eth);
@@ -2129,6 +2144,7 @@ static irqreturn_t mtk_handle_irq_rx(int irq, void *_eth)
 {
 	struct mtk_eth *eth = _eth;
 
+	eth->rx_events++;
 	if (likely(napi_schedule_prep(&eth->rx_napi))) {
 		__napi_schedule(&eth->rx_napi);
 		mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
@@ -2141,6 +2157,7 @@ static irqreturn_t mtk_handle_irq_tx(int irq, void *_eth)
 {
 	struct mtk_eth *eth = _eth;
 
+	eth->tx_events++;
 	if (likely(napi_schedule_prep(&eth->tx_napi))) {
 		__napi_schedule(&eth->tx_napi);
 		mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
@@ -2325,6 +2342,9 @@ static int mtk_stop(struct net_device *dev)
 	napi_disable(&eth->tx_napi);
 	napi_disable(&eth->rx_napi);
 
+	cancel_work_sync(&eth->rx_dim.work);
+	cancel_work_sync(&eth->tx_dim.work);
+
 	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);
@@ -2377,6 +2397,64 @@ static int mtk_clk_enable(struct mtk_eth *eth)
 	return ret;
 }
 
+static void mtk_dim_rx(struct work_struct *work)
+{
+	struct dim *dim = container_of(work, struct dim, work);
+	struct mtk_eth *eth = container_of(dim, struct mtk_eth, rx_dim);
+	struct dim_cq_moder cur_profile;
+	u32 val, cur;
+
+	cur_profile = net_dim_get_rx_moderation(eth->rx_dim.mode,
+						dim->profile_ix);
+	spin_lock_bh(&eth->dim_lock);
+
+	val = mtk_r32(eth, MTK_PDMA_DELAY_INT);
+	val &= MTK_PDMA_DELAY_TX_MASK;
+	val |= MTK_PDMA_DELAY_RX_EN;
+
+	cur = min_t(u32, DIV_ROUND_UP(cur_profile.usec, 20), MTK_PDMA_DELAY_PTIME_MASK);
+	val |= cur << MTK_PDMA_DELAY_RX_PTIME_SHIFT;
+
+	cur = min_t(u32, cur_profile.pkts, MTK_PDMA_DELAY_PINT_MASK);
+	val |= cur << MTK_PDMA_DELAY_RX_PINT_SHIFT;
+
+	mtk_w32(eth, val, MTK_PDMA_DELAY_INT);
+	mtk_w32(eth, val, MTK_QDMA_DELAY_INT);
+
+	spin_unlock_bh(&eth->dim_lock);
+
+	dim->state = DIM_START_MEASURE;
+}
+
+static void mtk_dim_tx(struct work_struct *work)
+{
+	struct dim *dim = container_of(work, struct dim, work);
+	struct mtk_eth *eth = container_of(dim, struct mtk_eth, tx_dim);
+	struct dim_cq_moder cur_profile;
+	u32 val, cur;
+
+	cur_profile = net_dim_get_tx_moderation(eth->tx_dim.mode,
+						dim->profile_ix);
+	spin_lock_bh(&eth->dim_lock);
+
+	val = mtk_r32(eth, MTK_PDMA_DELAY_INT);
+	val &= MTK_PDMA_DELAY_RX_MASK;
+	val |= MTK_PDMA_DELAY_TX_EN;
+
+	cur = min_t(u32, DIV_ROUND_UP(cur_profile.usec, 20), MTK_PDMA_DELAY_PTIME_MASK);
+	val |= cur << MTK_PDMA_DELAY_TX_PTIME_SHIFT;
+
+	cur = min_t(u32, cur_profile.pkts, MTK_PDMA_DELAY_PINT_MASK);
+	val |= cur << MTK_PDMA_DELAY_TX_PINT_SHIFT;
+
+	mtk_w32(eth, val, MTK_PDMA_DELAY_INT);
+	mtk_w32(eth, val, MTK_QDMA_DELAY_INT);
+
+	spin_unlock_bh(&eth->dim_lock);
+
+	dim->state = DIM_START_MEASURE;
+}
+
 static int mtk_hw_init(struct mtk_eth *eth)
 {
 	int i, val, ret;
@@ -2398,9 +2476,6 @@ static int mtk_hw_init(struct mtk_eth *eth)
 			goto err_disable_pm;
 		}
 
-		/* enable interrupt delay for RX */
-		mtk_w32(eth, MTK_PDMA_DELAY_RX_DELAY, MTK_PDMA_DELAY_INT);
-
 		/* disable delay and normal interrupt */
 		mtk_tx_irq_disable(eth, ~0);
 		mtk_rx_irq_disable(eth, ~0);
@@ -2439,11 +2514,11 @@ static int mtk_hw_init(struct mtk_eth *eth)
 	/* Enable RX VLan Offloading */
 	mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
 
-	/* enable interrupt delay for RX */
-	mtk_w32(eth, MTK_PDMA_DELAY_RX_DELAY, MTK_PDMA_DELAY_INT);
+	/* set interrupt delays based on current Net DIM sample */
+	mtk_dim_rx(&eth->rx_dim.work);
+	mtk_dim_tx(&eth->tx_dim.work);
 
 	/* disable delay and normal interrupt */
-	mtk_w32(eth, 0, MTK_QDMA_DELAY_INT);
 	mtk_tx_irq_disable(eth, ~0);
 	mtk_rx_irq_disable(eth, ~0);
 
@@ -2978,6 +3053,13 @@ static int mtk_probe(struct platform_device *pdev)
 	spin_lock_init(&eth->page_lock);
 	spin_lock_init(&eth->tx_irq_lock);
 	spin_lock_init(&eth->rx_irq_lock);
+	spin_lock_init(&eth->dim_lock);
+
+	eth->rx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+	INIT_WORK(&eth->rx_dim.work, mtk_dim_rx);
+
+	eth->tx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+	INIT_WORK(&eth->tx_dim.work, mtk_dim_tx);
 
 	if (!MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628)) {
 		eth->ethsys = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 540a5771b7bf..ceb5a4a661e6 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -16,6 +16,7 @@
 #include <linux/refcount.h>
 #include <linux/phylink.h>
 #include <linux/rhashtable.h>
+#include <linux/dim.h>
 #include "mtk_ppe.h"
 
 #define MTK_QDMA_PAGE_SIZE	2048
@@ -137,13 +138,18 @@
 
 /* PDMA Delay Interrupt Register */
 #define MTK_PDMA_DELAY_INT		0xa0c
+#define MTK_PDMA_DELAY_RX_MASK		GENMASK(15, 0)
 #define MTK_PDMA_DELAY_RX_EN		BIT(15)
-#define MTK_PDMA_DELAY_RX_PINT		4
 #define MTK_PDMA_DELAY_RX_PINT_SHIFT	8
-#define MTK_PDMA_DELAY_RX_PTIME		4
-#define MTK_PDMA_DELAY_RX_DELAY		\
-	(MTK_PDMA_DELAY_RX_EN | MTK_PDMA_DELAY_RX_PTIME | \
-	(MTK_PDMA_DELAY_RX_PINT << MTK_PDMA_DELAY_RX_PINT_SHIFT))
+#define MTK_PDMA_DELAY_RX_PTIME_SHIFT	0
+
+#define MTK_PDMA_DELAY_TX_MASK		GENMASK(31, 16)
+#define MTK_PDMA_DELAY_TX_EN		BIT(31)
+#define MTK_PDMA_DELAY_TX_PINT_SHIFT	24
+#define MTK_PDMA_DELAY_TX_PTIME_SHIFT	16
+
+#define MTK_PDMA_DELAY_PINT_MASK	0x7f
+#define MTK_PDMA_DELAY_PTIME_MASK	0xff
 
 /* PDMA Interrupt Status Register */
 #define MTK_PDMA_INT_STATUS	0xa20
@@ -225,6 +231,7 @@
 /* QDMA Interrupt Status Register */
 #define MTK_QDMA_INT_STATUS	0x1A18
 #define MTK_RX_DONE_DLY		BIT(30)
+#define MTK_TX_DONE_DLY		BIT(28)
 #define MTK_RX_DONE_INT3	BIT(19)
 #define MTK_RX_DONE_INT2	BIT(18)
 #define MTK_RX_DONE_INT1	BIT(17)
@@ -234,8 +241,7 @@
 #define MTK_TX_DONE_INT1	BIT(1)
 #define MTK_TX_DONE_INT0	BIT(0)
 #define MTK_RX_DONE_INT		MTK_RX_DONE_DLY
-#define MTK_TX_DONE_INT		(MTK_TX_DONE_INT0 | MTK_TX_DONE_INT1 | \
-				 MTK_TX_DONE_INT2 | MTK_TX_DONE_INT3)
+#define MTK_TX_DONE_INT		MTK_TX_DONE_DLY
 
 /* QDMA Interrupt grouping registers */
 #define MTK_QDMA_INT_GRP1	0x1a20
@@ -849,6 +855,7 @@ struct mtk_sgmii {
  * @page_lock:		Make sure that register operations are atomic
  * @tx_irq__lock:	Make sure that IRQ register operations are atomic
  * @rx_irq__lock:	Make sure that IRQ register operations are atomic
+ * @dim_lock:		Make sure that Net DIM operations are atomic
  * @dummy_dev:		we run 2 netdevs on 1 physical DMA ring and need a
  *			dummy for NAPI to work
  * @netdev:		The netdev instances
@@ -867,6 +874,14 @@ struct mtk_sgmii {
  * @rx_ring_qdma:	Pointer to the memory holding info about the QDMA RX ring
  * @tx_napi:		The TX NAPI struct
  * @rx_napi:		The RX NAPI struct
+ * @rx_events:		Net DIM RX event counter
+ * @rx_packets:		Net DIM RX packet counter
+ * @rx_bytes:		Net DIM RX byte counter
+ * @rx_dim:		Net DIM RX context
+ * @tx_events:		Net DIM TX event counter
+ * @tx_packets:		Net DIM TX packet counter
+ * @tx_bytes:		Net DIM TX byte counter
+ * @tx_dim:		Net DIM TX context
  * @scratch_ring:	Newer SoCs need memory for a second HW managed TX ring
  * @phy_scratch_ring:	physical address of scratch_ring
  * @scratch_head:	The scratch memory that scratch_ring points to.
@@ -911,6 +926,18 @@ struct mtk_eth {
 
 	const struct mtk_soc_data	*soc;
 
+	spinlock_t			dim_lock;
+
+	u32				rx_events;
+	u32				rx_packets;
+	u32				rx_bytes;
+	struct dim			rx_dim;
+
+	u32				tx_events;
+	u32				tx_packets;
+	u32				tx_bytes;
+	struct dim			tx_dim;
+
 	u32				tx_int_mask_reg;
 	u32				tx_int_status_reg;
 	u32				rx_dma_l4_valid;
-- 
2.31.1

[PATCH net-next v2 10/15] net: ethernet: mtk_eth_soc: cache HW pointer of last freed TX descriptor

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

The value is only updated by the CPU, so it is cheaper to access from the
ring data structure than from a hardware register.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 ++++----
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 ++
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 762e985fa294..6d23118b7a6c 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1364,7 +1364,7 @@ static int mtk_poll_tx_qdma(struct mtk_eth *eth, int budget,
 	struct mtk_tx_buf *tx_buf;
 	u32 cpu, dma;
 
-	cpu = mtk_r32(eth, MTK_QTX_CRX_PTR);
+	cpu = ring->last_free_ptr;
 	dma = mtk_r32(eth, MTK_QTX_DRX_PTR);
 
 	desc = mtk_qdma_phys_to_virt(ring, cpu);
@@ -1398,6 +1398,7 @@ static int mtk_poll_tx_qdma(struct mtk_eth *eth, int budget,
 		cpu = next_cpu;
 	}
 
+	ring->last_free_ptr = cpu;
 	mtk_w32(eth, cpu, MTK_QTX_CRX_PTR);
 
 	return budget;
@@ -1598,6 +1599,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth)
 	atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
 	ring->next_free = &ring->dma[0];
 	ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
+	ring->last_free_ptr = (u32)(ring->phys + ((MTK_DMA_SIZE - 1) * sz));
 	ring->thresh = MAX_SKB_FRAGS;
 
 	/* make sure that all changes to the dma ring are flushed before we
@@ -1611,9 +1613,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth)
 		mtk_w32(eth,
 			ring->phys + ((MTK_DMA_SIZE - 1) * sz),
 			MTK_QTX_CRX_PTR);
-		mtk_w32(eth,
-			ring->phys + ((MTK_DMA_SIZE - 1) * sz),
-			MTK_QTX_DRX_PTR);
+		mtk_w32(eth, ring->last_free_ptr, MTK_QTX_DRX_PTR);
 		mtk_w32(eth, (QDMA_RES_THRES << 8) | QDMA_RES_THRES,
 			MTK_QTX_CFG(0));
 	} else {
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index ceb5a4a661e6..6b92dd6c2cda 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -642,6 +642,7 @@ 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
+ * @last_free_ptr:	Hardware pointer value of the last free descriptor
  * @thresh:		The threshold of minimum amount of free descriptors
  * @free_count:		QDMA uses a linked list. Track how many free descriptors
  *			are present
@@ -652,6 +653,7 @@ struct mtk_tx_ring {
 	dma_addr_t phys;
 	struct mtk_tx_dma *next_free;
 	struct mtk_tx_dma *last_free;
+	u32 last_free_ptr;
 	u16 thresh;
 	atomic_t free_count;
 	int dma_size;
-- 
2.31.1

[PATCH net-next v2 11/15] net: ethernet: mtk_eth_soc: only read the full RX descriptor if DMA is done

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

Uncached memory access is expensive, and there is no need to access all
descriptor words if we can't process them anyway

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 6d23118b7a6c..4735942ed283 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -777,13 +777,18 @@ static inline int mtk_max_buf_size(int frag_size)
 	return buf_size;
 }
 
-static inline void mtk_rx_get_desc(struct mtk_rx_dma *rxd,
+static inline bool mtk_rx_get_desc(struct mtk_rx_dma *rxd,
 				   struct mtk_rx_dma *dma_rxd)
 {
-	rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
 	rxd->rxd2 = READ_ONCE(dma_rxd->rxd2);
+	if (!(rxd->rxd2 & RX_DMA_DONE))
+		return false;
+
+	rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
 	rxd->rxd3 = READ_ONCE(dma_rxd->rxd3);
 	rxd->rxd4 = READ_ONCE(dma_rxd->rxd4);
+
+	return true;
 }
 
 /* the qdma core needs scratch memory to be setup */
@@ -1255,8 +1260,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		rxd = &ring->dma[idx];
 		data = ring->data[idx];
 
-		mtk_rx_get_desc(&trxd, rxd);
-		if (!(trxd.rxd2 & RX_DMA_DONE))
+		if (!mtk_rx_get_desc(&trxd, rxd))
 			break;
 
 		/* find out which mac the packet come from. values start at 1 */
-- 
2.31.1

[PATCH net-next v2 12/15] net: ethernet: mtk_eth_soc: reduce unnecessary interrupts

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

Avoid rearming interrupt if napi_complete returns false

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 4735942ed283..e1792ccaedc3 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1519,8 +1519,8 @@ static int mtk_napi_tx(struct napi_struct *napi, int budget)
 	if (status & MTK_TX_DONE_INT)
 		return budget;
 
-	napi_complete(napi);
-	mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
+	if (napi_complete(napi))
+		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
 
 	return tx_done;
 }
@@ -1553,8 +1553,9 @@ static int mtk_napi_rx(struct napi_struct *napi, int budget)
 		remain_budget -= rx_done;
 		goto poll_again;
 	}
-	napi_complete(napi);
-	mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
+
+	if (napi_complete(napi))
+		mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
 
 	return rx_done + budget - remain_budget;
 }
-- 
2.31.1

[PATCH net-next v2 13/15] net: ethernet: mtk_eth_soc: rework NAPI callbacks

[Ilya Lipnitskiy]

Use napi_complete_done to communicate total TX and RX work done to NAPI.
Count total RX work up instead of remaining work down for clarity.
Remove unneeded local variables for clarity. Use do {} while instead of
goto for clarity.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 54 +++++++++------------
 1 file changed, 24 insertions(+), 30 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index e1792ccaedc3..8faf8fb1c83a 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1496,7 +1496,6 @@ static void mtk_handle_status_irq(struct mtk_eth *eth)
 static int mtk_napi_tx(struct napi_struct *napi, int budget)
 {
 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, tx_napi);
-	u32 status, mask;
 	int tx_done = 0;
 
 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
@@ -1505,21 +1504,19 @@ static int mtk_napi_tx(struct napi_struct *napi, int budget)
 	tx_done = mtk_poll_tx(eth, budget);
 
 	if (unlikely(netif_msg_intr(eth))) {
-		status = mtk_r32(eth, eth->tx_int_status_reg);
-		mask = mtk_r32(eth, eth->tx_int_mask_reg);
 		dev_info(eth->dev,
-			 "done tx %d, intr 0x%08x/0x%x\n",
-			 tx_done, status, mask);
+			 "done tx %d, intr 0x%08x/0x%x\n", tx_done,
+			 mtk_r32(eth, eth->tx_int_status_reg),
+			 mtk_r32(eth, eth->tx_int_mask_reg));
 	}
 
 	if (tx_done == budget)
 		return budget;
 
-	status = mtk_r32(eth, eth->tx_int_status_reg);
-	if (status & MTK_TX_DONE_INT)
+	if (mtk_r32(eth, eth->tx_int_status_reg) & MTK_TX_DONE_INT)
 		return budget;
 
-	if (napi_complete(napi))
+	if (napi_complete_done(napi, tx_done))
 		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
 
 	return tx_done;
@@ -1528,36 +1525,33 @@ static int mtk_napi_tx(struct napi_struct *napi, int budget)
 static int mtk_napi_rx(struct napi_struct *napi, int budget)
 {
 	struct mtk_eth *eth = container_of(napi, struct mtk_eth, rx_napi);
-	u32 status, mask;
-	int rx_done = 0;
-	int remain_budget = budget;
+	int rx_done_total = 0;
 
 	mtk_handle_status_irq(eth);
 
-poll_again:
-	mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);
-	rx_done = mtk_poll_rx(napi, remain_budget, eth);
+	do {
+		int rx_done;
 
-	if (unlikely(netif_msg_intr(eth))) {
-		status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
-		mask = mtk_r32(eth, MTK_PDMA_INT_MASK);
-		dev_info(eth->dev,
-			 "done rx %d, intr 0x%08x/0x%x\n",
-			 rx_done, status, mask);
-	}
-	if (rx_done == remain_budget)
-		return budget;
+		mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);
+		rx_done = mtk_poll_rx(napi, budget - rx_done_total, eth);
+		rx_done_total += rx_done;
 
-	status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
-	if (status & MTK_RX_DONE_INT) {
-		remain_budget -= rx_done;
-		goto poll_again;
-	}
+		if (unlikely(netif_msg_intr(eth))) {
+			dev_info(eth->dev,
+				 "done rx %d, intr 0x%08x/0x%x\n", rx_done,
+				 mtk_r32(eth, MTK_PDMA_INT_STATUS),
+				 mtk_r32(eth, MTK_PDMA_INT_MASK));
+		}
+
+		if (rx_done_total == budget)
+			return budget;
+
+	} while (mtk_r32(eth, MTK_PDMA_INT_STATUS) & MTK_RX_DONE_INT);
 
-	if (napi_complete(napi))
+	if (napi_complete_done(napi, rx_done_total))
 		mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
 
-	return rx_done + budget - remain_budget;
+	return rx_done_total;
 }
 
 static int mtk_tx_alloc(struct mtk_eth *eth)
-- 
2.31.1

[PATCH net-next v2 14/15] net: ethernet: mtk_eth_soc: set PPE flow hash as skb hash if present

[Ilya Lipnitskiy]

From: Felix Fietkau <nbd@nbd.name>

This improves GRO performance

Signed-off-by: Felix Fietkau <nbd@nbd.name>
[Ilya: Use MTK_RXD4_FOE_ENTRY instead of GENMASK(13, 0)]
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 8faf8fb1c83a..37e50a2e7d0e 100644
--- 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 <linux/jhash.h>
 #include <net/dsa.h>
 
 #include "mtk_eth_soc.h"
@@ -1250,6 +1251,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		struct net_device *netdev;
 		unsigned int pktlen;
 		dma_addr_t dma_addr;
+		u32 hash;
 		int mac;
 
 		ring = mtk_get_rx_ring(eth);
@@ -1319,6 +1321,12 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		skb->protocol = eth_type_trans(skb, netdev);
 		bytes += pktlen;
 
+		hash = trxd.rxd4 & MTK_RXD4_FOE_ENTRY;
+		if (hash != MTK_RXD4_FOE_ENTRY) {
+			hash = jhash_1word(hash, 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),
-- 
2.31.1

[PATCH net-next v2 15/15] net: ethernet: mtk_eth_soc: use iopoll.h macro for DMA init

[Ilya Lipnitskiy]

Replace a tight busy-wait loop without a pause with a standard
readx_poll_timeout_atomic routine with a 5 us poll period.

Tested by booting a MT7621 device to ensure the driver initializes
properly.

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 29 +++++++++------------
 drivers/net/ethernet/mediatek/mtk_eth_soc.h |  2 +-
 2 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 37e50a2e7d0e..ed4eacef17ce 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2033,25 +2033,22 @@ static int mtk_set_features(struct net_device *dev, netdev_features_t features)
 /* wait for DMA to finish whatever it is doing before we start using it again */
 static int mtk_dma_busy_wait(struct mtk_eth *eth)
 {
-	unsigned long t_start = jiffies;
+	unsigned int reg;
+	int ret;
+	u32 val;
 
-	while (1) {
-		if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA)) {
-			if (!(mtk_r32(eth, MTK_QDMA_GLO_CFG) &
-			      (MTK_RX_DMA_BUSY | MTK_TX_DMA_BUSY)))
-				return 0;
-		} else {
-			if (!(mtk_r32(eth, MTK_PDMA_GLO_CFG) &
-			      (MTK_RX_DMA_BUSY | MTK_TX_DMA_BUSY)))
-				return 0;
-		}
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
+		reg = MTK_QDMA_GLO_CFG;
+	else
+		reg = MTK_PDMA_GLO_CFG;
 
-		if (time_after(jiffies, t_start + MTK_DMA_BUSY_TIMEOUT))
-			break;
-	}
+	ret = readx_poll_timeout_atomic(__raw_readl, eth->base + reg, val,
+					!(val & (MTK_RX_DMA_BUSY | MTK_TX_DMA_BUSY)),
+					5, MTK_DMA_BUSY_TIMEOUT_US);
+	if (ret)
+		dev_err(eth->dev, "DMA init timeout\n");
 
-	dev_err(eth->dev, "DMA init timeout\n");
-	return -1;
+	return ret;
 }
 
 static int mtk_dma_init(struct mtk_eth *eth)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 6b92dd6c2cda..11331b44ba07 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -214,7 +214,7 @@
 #define MTK_TX_DMA_BUSY		BIT(1)
 #define MTK_RX_DMA_EN		BIT(2)
 #define MTK_TX_DMA_EN		BIT(0)
-#define MTK_DMA_BUSY_TIMEOUT	HZ
+#define MTK_DMA_BUSY_TIMEOUT_US	1000000
 
 /* QDMA Reset Index Register */
 #define MTK_QDMA_RST_IDX	0x1A08
-- 
2.31.1

Re: [PATCH net-next v2 00/15] mtk_eth_soc: fixes and performance improvements

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Thu, 22 Apr 2021 22:20:53 -0700 you wrote:
> Most of these changes come from OpenWrt where they have been present and
> tested for months.
> 
> First three patches are bug fixes. The rest are performance
> improvements. The last patch is a cleanup to use the iopoll.h macro for
> busy-waiting instead of a custom loop.
> 
> [...]

Here is the summary with links:
  - [net-next,v2,01/15] net: ethernet: mtk_eth_soc: fix RX VLAN offload
    https://git.kernel.org/netdev/net-next/c/3f57d8c40fea
  - [net-next,v2,02/15] net: ethernet: mtk_eth_soc: unmap RX data before calling build_skb
    https://git.kernel.org/netdev/net-next/c/5196c4178549
  - [net-next,v2,03/15] net: ethernet: mtk_eth_soc: fix build_skb cleanup
    https://git.kernel.org/netdev/net-next/c/787082ab9f7b
  - [net-next,v2,04/15] net: ethernet: mtk_eth_soc: use napi_consume_skb
    https://git.kernel.org/netdev/net-next/c/c30c4a827390
  - [net-next,v2,05/15] net: ethernet: mtk_eth_soc: reduce MDIO bus access latency
    https://git.kernel.org/netdev/net-next/c/3630d519d7c3
  - [net-next,v2,06/15] net: ethernet: mtk_eth_soc: remove unnecessary TX queue stops
    https://git.kernel.org/netdev/net-next/c/16ef670789b2
  - [net-next,v2,07/15] net: ethernet: mtk_eth_soc: use larger burst size for QDMA TX
    https://git.kernel.org/netdev/net-next/c/59555a8d0dd3
  - [net-next,v2,08/15] net: ethernet: mtk_eth_soc: increase DMA ring sizes
    https://git.kernel.org/netdev/net-next/c/6b4423b258b9
  - [net-next,v2,09/15] net: ethernet: mtk_eth_soc: implement dynamic interrupt moderation
    https://git.kernel.org/netdev/net-next/c/e9229ffd550b
  - [net-next,v2,10/15] net: ethernet: mtk_eth_soc: cache HW pointer of last freed TX descriptor
    https://git.kernel.org/netdev/net-next/c/4e6bf609569c
  - [net-next,v2,11/15] net: ethernet: mtk_eth_soc: only read the full RX descriptor if DMA is done
    https://git.kernel.org/netdev/net-next/c/816ac3e6e67b
  - [net-next,v2,12/15] net: ethernet: mtk_eth_soc: reduce unnecessary interrupts
    https://git.kernel.org/netdev/net-next/c/16769a8923fa
  - [net-next,v2,13/15] net: ethernet: mtk_eth_soc: rework NAPI callbacks
    https://git.kernel.org/netdev/net-next/c/db2c7b353db3
  - [net-next,v2,14/15] net: ethernet: mtk_eth_soc: set PPE flow hash as skb hash if present
    https://git.kernel.org/netdev/net-next/c/fa817272c37e
  - [net-next,v2,15/15] net: ethernet: mtk_eth_soc: use iopoll.h macro for DMA init
    https://git.kernel.org/netdev/net-next/c/3bc8e0aff23b

You are awesome, thank you!
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