[PATCH net-next v4 0/6] tsnep: multi queue support and some other improvements

[PATCH net-next v4 0/6] tsnep: multi queue support and some other improvements

[Gerhard Engleder]

Add support for additional TX/RX queues along with RX flow classification
support.

Binding is extended to allow additional interrupts for additional TX/RX
queues. Also dma-coherent is allowed as minor improvement.

RX path optimisation is done by using page pool as preparations for future
XDP support.

v4:
- rework dma-coherent commit message (Krzysztof Kozlowski)
- fixed order of interrupt-names in binding (Krzysztof Kozlowski)
- add line break between examples in binding (Krzysztof Kozlowski)
- add RX_CLS_LOC_ANY support to RX flow classification

v3:
- now with changes in cover letter

v2:
- use netdev_name() (Jakub Kicinski)
- use ENOENT if RX flow rule is not found (Jakub Kicinski)
- eliminate return code of tsnep_add_rule() (Jakub Kicinski)
- remove commit with lazy refill due to depletion problem (Jakub Kicinski)

Gerhard Engleder (6):
  dt-bindings: net: tsnep: Allow dma-coherent
  dt-bindings: net: tsnep: Allow additional interrupts
  tsnep: Move interrupt from device to queue
  tsnep: Support multiple TX/RX queue pairs
  tsnep: Add EtherType RX flow classification support
  tsnep: Use page pool for RX

 .../bindings/net/engleder,tsnep.yaml          |  43 ++-
 drivers/net/ethernet/engleder/Kconfig         |   1 +
 drivers/net/ethernet/engleder/Makefile        |   2 +-
 drivers/net/ethernet/engleder/tsnep.h         |  47 ++-
 drivers/net/ethernet/engleder/tsnep_ethtool.c |  40 ++
 drivers/net/ethernet/engleder/tsnep_hw.h      |  13 +-
 drivers/net/ethernet/engleder/tsnep_main.c    | 356 +++++++++++++-----
 drivers/net/ethernet/engleder/tsnep_rxnfc.c   | 307 +++++++++++++++
 8 files changed, 693 insertions(+), 116 deletions(-)
 create mode 100644 drivers/net/ethernet/engleder/tsnep_rxnfc.c

-- 
2.30.2

[PATCH net-next v4 1/6] dt-bindings: net: tsnep: Allow dma-coherent

[Gerhard Engleder]

Within SoCs like ZynqMP, FPGA logic can be connected to different kinds
of AXI master ports. Also cache coherent AXI master ports are available.
The property "dma-coherent" is used to signal that DMA is cache
coherent.

Add "dma-coherent" property to allow the configuration of cache coherent
DMA.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 Documentation/devicetree/bindings/net/engleder,tsnep.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/engleder,tsnep.yaml b/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
index d0e1476e15b5..37e08ee744a8 100644
--- a/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
+++ b/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
@@ -22,6 +22,8 @@ properties:
   interrupts:
     maxItems: 1
 
+  dma-coherent: true
+
   local-mac-address: true
 
   mac-address: true
-- 
2.30.2

[PATCH net-next v4 2/6] dt-bindings: net: tsnep: Allow additional interrupts

[Gerhard Engleder]

Additional TX/RX queue pairs require dedicated interrupts. Extend
binding with additional interrupts.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 .../bindings/net/engleder,tsnep.yaml          | 41 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/engleder,tsnep.yaml b/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
index 37e08ee744a8..5bd964a46a9d 100644
--- a/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
+++ b/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
@@ -20,7 +20,24 @@ properties:
     maxItems: 1
 
   interrupts:
-    maxItems: 1
+    minItems: 1
+    maxItems: 8
+
+  interrupt-names:
+    minItems: 1
+    items:
+      - const: mac
+      - const: txrx-1
+      - const: txrx-2
+      - const: txrx-3
+      - const: txrx-4
+      - const: txrx-5
+      - const: txrx-6
+      - const: txrx-7
+    description:
+      The main interrupt for basic MAC features and the first TX/RX queue pair
+      is named "mac". "txrx-[1-7]" are the interrupts for additional TX/RX
+      queue pairs.
 
   dma-coherent: true
 
@@ -60,7 +77,7 @@ examples:
     axi {
         #address-cells = <2>;
         #size-cells = <2>;
-        tnsep0: ethernet@a0000000 {
+        tsnep0: ethernet@a0000000 {
             compatible = "engleder,tsnep";
             reg = <0x0 0xa0000000 0x0 0x10000>;
             interrupts = <0 89 1>;
@@ -78,4 +95,24 @@ examples:
                 };
             };
         };
+
+        tsnep1: ethernet@a0010000 {
+            compatible = "engleder,tsnep";
+            reg = <0x0 0xa0010000 0x0 0x10000>;
+            interrupts = <0 93 1>, <0 94 1>, <0 95 1>, <0 96 1>;
+            interrupt-names = "mac", "txrx-1", "txrx-2", "txrx-3";
+            interrupt-parent = <&gic>;
+            local-mac-address = [00 00 00 00 00 00];
+            phy-mode = "rgmii";
+            phy-handle = <&phy1>;
+            mdio {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                suppress-preamble;
+                phy1: ethernet-phy@1 {
+                    reg = <1>;
+                    rxc-skew-ps = <1080>;
+                };
+            };
+        };
     };
-- 
2.30.2

[PATCH net-next v4 3/6] tsnep: Move interrupt from device to queue

[Gerhard Engleder]

For multiple queues multiple interrupts shall be used. Therefore, rework
global interrupt to per queue interrupt.

Every interrupt name shall contain interface name and queue information.
To get a valid interface name, the interrupt request needs to by done
during open like in other drivers. Additionally, this allows the removal
of some initialisation checks in the interrupt handler.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 drivers/net/ethernet/engleder/tsnep.h      |   4 +-
 drivers/net/ethernet/engleder/tsnep_main.c | 128 +++++++++++++++------
 2 files changed, 99 insertions(+), 33 deletions(-)

diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h
index 147fe03ca979..149c9acbae9c 100644
--- a/drivers/net/ethernet/engleder/tsnep.h
+++ b/drivers/net/ethernet/engleder/tsnep.h
@@ -55,6 +55,7 @@ struct tsnep_tx_entry {
 struct tsnep_tx {
 	struct tsnep_adapter *adapter;
 	void __iomem *addr;
+	int queue_index;
 
 	void *page[TSNEP_RING_PAGE_COUNT];
 	dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
@@ -105,12 +106,14 @@ struct tsnep_rx {
 
 struct tsnep_queue {
 	struct tsnep_adapter *adapter;
+	char name[IFNAMSIZ + 9];
 
 	struct tsnep_tx *tx;
 	struct tsnep_rx *rx;
 
 	struct napi_struct napi;
 
+	int irq;
 	u32 irq_mask;
 };
 
@@ -126,7 +129,6 @@ struct tsnep_adapter {
 	struct platform_device *pdev;
 	struct device *dmadev;
 	void __iomem *addr;
-	int irq;
 
 	bool gate_control;
 	/* gate control lock */
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 19db8b1dddc4..c95328ef992b 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -60,22 +60,29 @@ static irqreturn_t tsnep_irq(int irq, void *arg)
 		iowrite32(active, adapter->addr + ECM_INT_ACKNOWLEDGE);
 
 	/* handle link interrupt */
-	if ((active & ECM_INT_LINK) != 0) {
-		if (adapter->netdev->phydev)
-			phy_mac_interrupt(adapter->netdev->phydev);
-	}
+	if ((active & ECM_INT_LINK) != 0)
+		phy_mac_interrupt(adapter->netdev->phydev);
 
 	/* handle TX/RX queue 0 interrupt */
 	if ((active & adapter->queue[0].irq_mask) != 0) {
-		if (adapter->netdev) {
-			tsnep_disable_irq(adapter, adapter->queue[0].irq_mask);
-			napi_schedule(&adapter->queue[0].napi);
-		}
+		tsnep_disable_irq(adapter, adapter->queue[0].irq_mask);
+		napi_schedule(&adapter->queue[0].napi);
 	}
 
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t tsnep_irq_txrx(int irq, void *arg)
+{
+	struct tsnep_queue *queue = arg;
+
+	/* handle TX/RX queue interrupt */
+	tsnep_disable_irq(queue->adapter, queue->irq_mask);
+	napi_schedule(&queue->napi);
+
+	return IRQ_HANDLED;
+}
+
 static int tsnep_mdiobus_read(struct mii_bus *bus, int addr, int regnum)
 {
 	struct tsnep_adapter *adapter = bus->priv;
@@ -536,7 +543,7 @@ static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget)
 }
 
 static int tsnep_tx_open(struct tsnep_adapter *adapter, void __iomem *addr,
-			 struct tsnep_tx *tx)
+			 int queue_index, struct tsnep_tx *tx)
 {
 	dma_addr_t dma;
 	int retval;
@@ -544,6 +551,7 @@ static int tsnep_tx_open(struct tsnep_adapter *adapter, void __iomem *addr,
 	memset(tx, 0, sizeof(*tx));
 	tx->adapter = adapter;
 	tx->addr = addr;
+	tx->queue_index = queue_index;
 
 	retval = tsnep_tx_ring_init(tx);
 	if (retval)
@@ -854,6 +862,56 @@ static int tsnep_poll(struct napi_struct *napi, int budget)
 	return min(done, budget - 1);
 }
 
+static int tsnep_request_irq(struct tsnep_queue *queue, bool first)
+{
+	const char *name = netdev_name(queue->adapter->netdev);
+	irq_handler_t handler;
+	void *dev;
+	int retval;
+
+	if (first) {
+		sprintf(queue->name, "%s-mac", name);
+		handler = tsnep_irq;
+		dev = queue->adapter;
+	} else {
+		if (queue->tx && queue->rx)
+			sprintf(queue->name, "%s-txrx-%d", name,
+				queue->rx->queue_index);
+		else if (queue->tx)
+			sprintf(queue->name, "%s-tx-%d", name,
+				queue->tx->queue_index);
+		else
+			sprintf(queue->name, "%s-rx-%d", name,
+				queue->rx->queue_index);
+		handler = tsnep_irq_txrx;
+		dev = queue;
+	}
+
+	retval = request_irq(queue->irq, handler, 0, queue->name, dev);
+	if (retval) {
+		/* if name is empty, then interrupt won't be freed */
+		memset(queue->name, 0, sizeof(queue->name));
+	}
+
+	return retval;
+}
+
+static void tsnep_free_irq(struct tsnep_queue *queue, bool first)
+{
+	void *dev;
+
+	if (!strlen(queue->name))
+		return;
+
+	if (first)
+		dev = queue->adapter;
+	else
+		dev = queue;
+
+	free_irq(queue->irq, dev);
+	memset(queue->name, 0, sizeof(queue->name));
+}
+
 static int tsnep_netdev_open(struct net_device *netdev)
 {
 	struct tsnep_adapter *adapter = netdev_priv(netdev);
@@ -863,15 +921,11 @@ static int tsnep_netdev_open(struct net_device *netdev)
 	int rx_queue_index = 0;
 	int retval;
 
-	retval = tsnep_phy_open(adapter);
-	if (retval)
-		return retval;
-
 	for (i = 0; i < adapter->num_queues; i++) {
 		adapter->queue[i].adapter = adapter;
 		if (adapter->queue[i].tx) {
 			addr = adapter->addr + TSNEP_QUEUE(tx_queue_index);
-			retval = tsnep_tx_open(adapter, addr,
+			retval = tsnep_tx_open(adapter, addr, tx_queue_index,
 					       adapter->queue[i].tx);
 			if (retval)
 				goto failed;
@@ -886,6 +940,14 @@ static int tsnep_netdev_open(struct net_device *netdev)
 				goto failed;
 			rx_queue_index++;
 		}
+
+		retval = tsnep_request_irq(&adapter->queue[i], i == 0);
+		if (retval) {
+			netif_err(adapter, drv, adapter->netdev,
+				  "can't get assigned irq %d.\n",
+				  adapter->queue[i].irq);
+			goto failed;
+		}
 	}
 
 	retval = netif_set_real_num_tx_queues(adapter->netdev,
@@ -897,6 +959,11 @@ static int tsnep_netdev_open(struct net_device *netdev)
 	if (retval)
 		goto failed;
 
+	tsnep_enable_irq(adapter, ECM_INT_LINK);
+	retval = tsnep_phy_open(adapter);
+	if (retval)
+		goto phy_failed;
+
 	for (i = 0; i < adapter->num_queues; i++) {
 		netif_napi_add(adapter->netdev, &adapter->queue[i].napi,
 			       tsnep_poll, 64);
@@ -907,14 +974,18 @@ static int tsnep_netdev_open(struct net_device *netdev)
 
 	return 0;
 
+phy_failed:
+	tsnep_disable_irq(adapter, ECM_INT_LINK);
+	tsnep_phy_close(adapter);
 failed:
 	for (i = 0; i < adapter->num_queues; i++) {
+		tsnep_free_irq(&adapter->queue[i], i == 0);
+
 		if (adapter->queue[i].rx)
 			tsnep_rx_close(adapter->queue[i].rx);
 		if (adapter->queue[i].tx)
 			tsnep_tx_close(adapter->queue[i].tx);
 	}
-	tsnep_phy_close(adapter);
 	return retval;
 }
 
@@ -923,20 +994,23 @@ static int tsnep_netdev_close(struct net_device *netdev)
 	struct tsnep_adapter *adapter = netdev_priv(netdev);
 	int i;
 
+	tsnep_disable_irq(adapter, ECM_INT_LINK);
+	tsnep_phy_close(adapter);
+
 	for (i = 0; i < adapter->num_queues; i++) {
 		tsnep_disable_irq(adapter, adapter->queue[i].irq_mask);
 
 		napi_disable(&adapter->queue[i].napi);
 		netif_napi_del(&adapter->queue[i].napi);
 
+		tsnep_free_irq(&adapter->queue[i], i == 0);
+
 		if (adapter->queue[i].rx)
 			tsnep_rx_close(adapter->queue[i].rx);
 		if (adapter->queue[i].tx)
 			tsnep_tx_close(adapter->queue[i].tx);
 	}
 
-	tsnep_phy_close(adapter);
-
 	return 0;
 }
 
@@ -1225,10 +1299,8 @@ static int tsnep_probe(struct platform_device *pdev)
 	adapter->addr = devm_ioremap_resource(&pdev->dev, io);
 	if (IS_ERR(adapter->addr))
 		return PTR_ERR(adapter->addr);
-	adapter->irq = platform_get_irq(pdev, 0);
 	netdev->mem_start = io->start;
 	netdev->mem_end = io->end;
-	netdev->irq = adapter->irq;
 
 	type = ioread32(adapter->addr + ECM_TYPE);
 	revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT;
@@ -1238,10 +1310,14 @@ static int tsnep_probe(struct platform_device *pdev)
 	adapter->num_tx_queues = TSNEP_QUEUES;
 	adapter->num_rx_queues = TSNEP_QUEUES;
 	adapter->num_queues = TSNEP_QUEUES;
+	adapter->queue[0].irq = platform_get_irq(pdev, 0);
 	adapter->queue[0].tx = &adapter->tx[0];
 	adapter->queue[0].rx = &adapter->rx[0];
 	adapter->queue[0].irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0;
 
+	netdev->irq = adapter->queue[0].irq;
+	tsnep_disable_irq(adapter, ECM_INT_ALL);
+
 	retval = dma_set_mask_and_coherent(&adapter->pdev->dev,
 					   DMA_BIT_MASK(64));
 	if (retval) {
@@ -1249,19 +1325,9 @@ static int tsnep_probe(struct platform_device *pdev)
 		return retval;
 	}
 
-	tsnep_disable_irq(adapter, ECM_INT_ALL);
-	retval = devm_request_irq(&adapter->pdev->dev, adapter->irq, tsnep_irq,
-				  0, TSNEP, adapter);
-	if (retval != 0) {
-		dev_err(&adapter->pdev->dev, "can't get assigned irq %d.\n",
-			adapter->irq);
-		return retval;
-	}
-	tsnep_enable_irq(adapter, ECM_INT_LINK);
-
 	retval = tsnep_mac_init(adapter);
 	if (retval)
-		goto mac_init_failed;
+		return retval;
 
 	retval = tsnep_mdio_init(adapter);
 	if (retval)
@@ -1307,8 +1373,6 @@ static int tsnep_probe(struct platform_device *pdev)
 	if (adapter->mdiobus)
 		mdiobus_unregister(adapter->mdiobus);
 mdio_init_failed:
-mac_init_failed:
-	tsnep_disable_irq(adapter, ECM_INT_ALL);
 	return retval;
 }
 
-- 
2.30.2

[PATCH net-next v4 4/6] tsnep: Support multiple TX/RX queue pairs

[Gerhard Engleder]

Support additional TX/RX queue pairs if dedicated interrupt is
available. Interrupts are detected by name in device tree.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 drivers/net/ethernet/engleder/tsnep.h      |  2 -
 drivers/net/ethernet/engleder/tsnep_hw.h   |  1 +
 drivers/net/ethernet/engleder/tsnep_main.c | 61 ++++++++++++++++++----
 3 files changed, 53 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h
index 149c9acbae9c..62a279bcb011 100644
--- a/drivers/net/ethernet/engleder/tsnep.h
+++ b/drivers/net/ethernet/engleder/tsnep.h
@@ -21,8 +21,6 @@
 #define TSNEP_RING_ENTRIES_PER_PAGE (PAGE_SIZE / TSNEP_DESC_SIZE)
 #define TSNEP_RING_PAGE_COUNT (TSNEP_RING_SIZE / TSNEP_RING_ENTRIES_PER_PAGE)
 
-#define TSNEP_QUEUES 1
-
 struct tsnep_gcl {
 	void __iomem *addr;
 
diff --git a/drivers/net/ethernet/engleder/tsnep_hw.h b/drivers/net/ethernet/engleder/tsnep_hw.h
index e03aaafab559..e6cc6fbaf0d7 100644
--- a/drivers/net/ethernet/engleder/tsnep_hw.h
+++ b/drivers/net/ethernet/engleder/tsnep_hw.h
@@ -34,6 +34,7 @@
 #define ECM_INT_LINK 0x00000020
 #define ECM_INT_TX_0 0x00000100
 #define ECM_INT_RX_0 0x00000200
+#define ECM_INT_TXRX_SHIFT 2
 #define ECM_INT_ALL 0x7FFFFFFF
 #define ECM_INT_DISABLE 0x80000000
 
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index c95328ef992b..bf088b91efb7 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -1265,6 +1265,52 @@ static int tsnep_phy_init(struct tsnep_adapter *adapter)
 	return 0;
 }
 
+static int tsnep_queue_init(struct tsnep_adapter *adapter, int queue_count)
+{
+	u32 irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0;
+	char name[8];
+	int i;
+	int retval;
+
+	/* one TX/RX queue pair for netdev is mandatory */
+	if (platform_irq_count(adapter->pdev) == 1)
+		retval = platform_get_irq(adapter->pdev, 0);
+	else
+		retval = platform_get_irq_byname(adapter->pdev, "mac");
+	if (retval < 0)
+		return retval;
+	adapter->num_tx_queues = 1;
+	adapter->num_rx_queues = 1;
+	adapter->num_queues = 1;
+	adapter->queue[0].irq = retval;
+	adapter->queue[0].tx = &adapter->tx[0];
+	adapter->queue[0].rx = &adapter->rx[0];
+	adapter->queue[0].irq_mask = irq_mask;
+
+	adapter->netdev->irq = adapter->queue[0].irq;
+
+	/* add additional TX/RX queue pairs only if dedicated interrupt is
+	 * available
+	 */
+	for (i = 1; i < queue_count; i++) {
+		sprintf(name, "txrx-%d", i);
+		retval = platform_get_irq_byname_optional(adapter->pdev, name);
+		if (retval < 0)
+			break;
+
+		adapter->num_tx_queues++;
+		adapter->num_rx_queues++;
+		adapter->num_queues++;
+		adapter->queue[i].irq = retval;
+		adapter->queue[i].tx = &adapter->tx[i];
+		adapter->queue[i].rx = &adapter->rx[i];
+		adapter->queue[i].irq_mask =
+			irq_mask << (ECM_INT_TXRX_SHIFT * i);
+	}
+
+	return 0;
+}
+
 static int tsnep_probe(struct platform_device *pdev)
 {
 	struct tsnep_adapter *adapter;
@@ -1273,6 +1319,7 @@ static int tsnep_probe(struct platform_device *pdev)
 	u32 type;
 	int revision;
 	int version;
+	int queue_count;
 	int retval;
 
 	netdev = devm_alloc_etherdev_mqs(&pdev->dev,
@@ -1305,19 +1352,15 @@ static int tsnep_probe(struct platform_device *pdev)
 	type = ioread32(adapter->addr + ECM_TYPE);
 	revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT;
 	version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT;
+	queue_count = (type & ECM_QUEUE_COUNT_MASK) >> ECM_QUEUE_COUNT_SHIFT;
 	adapter->gate_control = type & ECM_GATE_CONTROL;
 
-	adapter->num_tx_queues = TSNEP_QUEUES;
-	adapter->num_rx_queues = TSNEP_QUEUES;
-	adapter->num_queues = TSNEP_QUEUES;
-	adapter->queue[0].irq = platform_get_irq(pdev, 0);
-	adapter->queue[0].tx = &adapter->tx[0];
-	adapter->queue[0].rx = &adapter->rx[0];
-	adapter->queue[0].irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0;
-
-	netdev->irq = adapter->queue[0].irq;
 	tsnep_disable_irq(adapter, ECM_INT_ALL);
 
+	retval = tsnep_queue_init(adapter, queue_count);
+	if (retval)
+		return retval;
+
 	retval = dma_set_mask_and_coherent(&adapter->pdev->dev,
 					   DMA_BIT_MASK(64));
 	if (retval) {
-- 
2.30.2

[PATCH net-next v4 5/6] tsnep: Add EtherType RX flow classification support

[Gerhard Engleder]

Received Ethernet frames are assigned to first RX queue per default.
Based on EtherType Ethernet frames can be assigned to other RX queues.
This enables processing of real-time Ethernet protocols on dedicated
RX queues.

Add RX flow classification interface for EtherType based RX queue
assignment.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 drivers/net/ethernet/engleder/Makefile        |   2 +-
 drivers/net/ethernet/engleder/tsnep.h         |  36 ++
 drivers/net/ethernet/engleder/tsnep_ethtool.c |  40 +++
 drivers/net/ethernet/engleder/tsnep_hw.h      |  12 +-
 drivers/net/ethernet/engleder/tsnep_main.c    |  11 +
 drivers/net/ethernet/engleder/tsnep_rxnfc.c   | 307 ++++++++++++++++++
 6 files changed, 403 insertions(+), 5 deletions(-)
 create mode 100644 drivers/net/ethernet/engleder/tsnep_rxnfc.c

diff --git a/drivers/net/ethernet/engleder/Makefile b/drivers/net/ethernet/engleder/Makefile
index cce2191cb889..b6e3b16623de 100644
--- a/drivers/net/ethernet/engleder/Makefile
+++ b/drivers/net/ethernet/engleder/Makefile
@@ -6,5 +6,5 @@
 obj-$(CONFIG_TSNEP) += tsnep.o
 
 tsnep-objs := tsnep_main.o tsnep_ethtool.o tsnep_ptp.o tsnep_tc.o \
-	      $(tsnep-y)
+	      tsnep_rxnfc.o $(tsnep-y)
 tsnep-$(CONFIG_TSNEP_SELFTESTS) += tsnep_selftests.o
diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h
index 62a279bcb011..2ca34ae9b55a 100644
--- a/drivers/net/ethernet/engleder/tsnep.h
+++ b/drivers/net/ethernet/engleder/tsnep.h
@@ -37,6 +37,24 @@ struct tsnep_gcl {
 	bool change;
 };
 
+enum tsnep_rxnfc_filter_type {
+	TSNEP_RXNFC_ETHER_TYPE,
+};
+
+struct tsnep_rxnfc_filter {
+	enum tsnep_rxnfc_filter_type type;
+	union {
+		u16 ether_type;
+	};
+};
+
+struct tsnep_rxnfc_rule {
+	struct list_head list;
+	struct tsnep_rxnfc_filter filter;
+	int queue_index;
+	int location;
+};
+
 struct tsnep_tx_entry {
 	struct tsnep_tx_desc *desc;
 	struct tsnep_tx_desc_wb *desc_wb;
@@ -141,6 +159,12 @@ struct tsnep_adapter {
 	/* ptp clock lock */
 	spinlock_t ptp_lock;
 
+	/* RX flow classification rules lock */
+	struct mutex rxnfc_lock;
+	struct list_head rxnfc_rules;
+	int rxnfc_count;
+	int rxnfc_max;
+
 	int num_tx_queues;
 	struct tsnep_tx tx[TSNEP_MAX_QUEUES];
 	int num_rx_queues;
@@ -161,6 +185,18 @@ void tsnep_tc_cleanup(struct tsnep_adapter *adapter);
 int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
 		   void *type_data);
 
+int tsnep_rxnfc_init(struct tsnep_adapter *adapter);
+void tsnep_rxnfc_cleanup(struct tsnep_adapter *adapter);
+int tsnep_rxnfc_get_rule(struct tsnep_adapter *adapter,
+			 struct ethtool_rxnfc *cmd);
+int tsnep_rxnfc_get_all(struct tsnep_adapter *adapter,
+			struct ethtool_rxnfc *cmd,
+			u32 *rule_locs);
+int tsnep_rxnfc_add_rule(struct tsnep_adapter *adapter,
+			 struct ethtool_rxnfc *cmd);
+int tsnep_rxnfc_del_rule(struct tsnep_adapter *adapter,
+			 struct ethtool_rxnfc *cmd);
+
 #if IS_ENABLED(CONFIG_TSNEP_SELFTESTS)
 int tsnep_ethtool_get_test_count(void);
 void tsnep_ethtool_get_test_strings(u8 *data);
diff --git a/drivers/net/ethernet/engleder/tsnep_ethtool.c b/drivers/net/ethernet/engleder/tsnep_ethtool.c
index e6760dc68ddd..a713a126b227 100644
--- a/drivers/net/ethernet/engleder/tsnep_ethtool.c
+++ b/drivers/net/ethernet/engleder/tsnep_ethtool.c
@@ -250,6 +250,44 @@ static int tsnep_ethtool_get_sset_count(struct net_device *netdev, int sset)
 	}
 }
 
+static int tsnep_ethtool_get_rxnfc(struct net_device *dev,
+				   struct ethtool_rxnfc *cmd, u32 *rule_locs)
+{
+	struct tsnep_adapter *adapter = netdev_priv(dev);
+
+	switch (cmd->cmd) {
+	case ETHTOOL_GRXRINGS:
+		cmd->data = adapter->num_rx_queues;
+		return 0;
+	case ETHTOOL_GRXCLSRLCNT:
+		cmd->rule_cnt = adapter->rxnfc_count;
+		cmd->data = adapter->rxnfc_max;
+		cmd->data |= RX_CLS_LOC_SPECIAL;
+		return 0;
+	case ETHTOOL_GRXCLSRULE:
+		return tsnep_rxnfc_get_rule(adapter, cmd);
+	case ETHTOOL_GRXCLSRLALL:
+		return tsnep_rxnfc_get_all(adapter, cmd, rule_locs);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int tsnep_ethtool_set_rxnfc(struct net_device *dev,
+				   struct ethtool_rxnfc *cmd)
+{
+	struct tsnep_adapter *adapter = netdev_priv(dev);
+
+	switch (cmd->cmd) {
+	case ETHTOOL_SRXCLSRLINS:
+		return tsnep_rxnfc_add_rule(adapter, cmd);
+	case ETHTOOL_SRXCLSRLDEL:
+		return tsnep_rxnfc_del_rule(adapter, cmd);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static int tsnep_ethtool_get_ts_info(struct net_device *dev,
 				     struct ethtool_ts_info *info)
 {
@@ -287,6 +325,8 @@ const struct ethtool_ops tsnep_ethtool_ops = {
 	.get_strings = tsnep_ethtool_get_strings,
 	.get_ethtool_stats = tsnep_ethtool_get_ethtool_stats,
 	.get_sset_count = tsnep_ethtool_get_sset_count,
+	.get_rxnfc = tsnep_ethtool_get_rxnfc,
+	.set_rxnfc = tsnep_ethtool_set_rxnfc,
 	.get_ts_info = tsnep_ethtool_get_ts_info,
 	.get_link_ksettings = phy_ethtool_get_link_ksettings,
 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
diff --git a/drivers/net/ethernet/engleder/tsnep_hw.h b/drivers/net/ethernet/engleder/tsnep_hw.h
index e6cc6fbaf0d7..315dada75323 100644
--- a/drivers/net/ethernet/engleder/tsnep_hw.h
+++ b/drivers/net/ethernet/engleder/tsnep_hw.h
@@ -122,10 +122,6 @@
 #define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL 0x0191
 #define TSNEP_RX_STATISTIC_FIFO_OVERFLOW 0x0192
 #define TSNEP_RX_STATISTIC_INVALID_FRAME 0x0193
-#define TSNEP_RX_ASSIGN 0x01A0
-#define TSNEP_RX_ASSIGN_ETHER_TYPE_ACTIVE 0x00000001
-#define TSNEP_RX_ASSIGN_ETHER_TYPE_MASK 0xFFFF0000
-#define TSNEP_RX_ASSIGN_ETHER_TYPE_SHIFT 16
 #define TSNEP_MAC_ADDRESS_LOW 0x0800
 #define TSNEP_MAC_ADDRESS_HIGH 0x0804
 #define TSNEP_RX_FILTER 0x0806
@@ -152,6 +148,14 @@
 #define TSNEP_GCL_A 0x2000
 #define TSNEP_GCL_B 0x2800
 #define TSNEP_GCL_SIZE SZ_2K
+#define TSNEP_RX_ASSIGN 0x0840
+#define TSNEP_RX_ASSIGN_ACTIVE 0x00000001
+#define TSNEP_RX_ASSIGN_QUEUE_MASK 0x00000006
+#define TSNEP_RX_ASSIGN_QUEUE_SHIFT 1
+#define TSNEP_RX_ASSIGN_OFFSET 1
+#define TSNEP_RX_ASSIGN_ETHER_TYPE 0x0880
+#define TSNEP_RX_ASSIGN_ETHER_TYPE_OFFSET 2
+#define TSNEP_RX_ASSIGN_ETHER_TYPE_COUNT 2
 
 /* tsnep gate control list operation */
 struct tsnep_gcl_operation {
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index bf088b91efb7..a6b81f32d76b 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -1341,6 +1341,8 @@ static int tsnep_probe(struct platform_device *pdev)
 	netdev->max_mtu = TSNEP_MAX_FRAME_SIZE;
 
 	mutex_init(&adapter->gate_control_lock);
+	mutex_init(&adapter->rxnfc_lock);
+	INIT_LIST_HEAD(&adapter->rxnfc_rules);
 
 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	adapter->addr = devm_ioremap_resource(&pdev->dev, io);
@@ -1354,6 +1356,7 @@ static int tsnep_probe(struct platform_device *pdev)
 	version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT;
 	queue_count = (type & ECM_QUEUE_COUNT_MASK) >> ECM_QUEUE_COUNT_SHIFT;
 	adapter->gate_control = type & ECM_GATE_CONTROL;
+	adapter->rxnfc_max = TSNEP_RX_ASSIGN_ETHER_TYPE_COUNT;
 
 	tsnep_disable_irq(adapter, ECM_INT_ALL);
 
@@ -1388,6 +1391,10 @@ static int tsnep_probe(struct platform_device *pdev)
 	if (retval)
 		goto tc_init_failed;
 
+	retval = tsnep_rxnfc_init(adapter);
+	if (retval)
+		goto rxnfc_init_failed;
+
 	netdev->netdev_ops = &tsnep_netdev_ops;
 	netdev->ethtool_ops = &tsnep_ethtool_ops;
 	netdev->features = NETIF_F_SG;
@@ -1408,6 +1415,8 @@ static int tsnep_probe(struct platform_device *pdev)
 	return 0;
 
 register_failed:
+	tsnep_rxnfc_cleanup(adapter);
+rxnfc_init_failed:
 	tsnep_tc_cleanup(adapter);
 tc_init_failed:
 	tsnep_ptp_cleanup(adapter);
@@ -1425,6 +1434,8 @@ static int tsnep_remove(struct platform_device *pdev)
 
 	unregister_netdev(adapter->netdev);
 
+	tsnep_rxnfc_cleanup(adapter);
+
 	tsnep_tc_cleanup(adapter);
 
 	tsnep_ptp_cleanup(adapter);
diff --git a/drivers/net/ethernet/engleder/tsnep_rxnfc.c b/drivers/net/ethernet/engleder/tsnep_rxnfc.c
new file mode 100644
index 000000000000..9ac2a0cf3833
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_rxnfc.c
@@ -0,0 +1,307 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2022 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+#define ETHER_TYPE_FULL_MASK ((__force __be16)~0)
+
+static void tsnep_enable_rule(struct tsnep_adapter *adapter,
+			      struct tsnep_rxnfc_rule *rule)
+{
+	u8 rx_assign;
+	void __iomem *addr;
+
+	rx_assign = TSNEP_RX_ASSIGN_ACTIVE;
+	rx_assign |= (rule->queue_index << TSNEP_RX_ASSIGN_QUEUE_SHIFT) &
+		     TSNEP_RX_ASSIGN_QUEUE_MASK;
+
+	addr = adapter->addr + TSNEP_RX_ASSIGN_ETHER_TYPE +
+	       TSNEP_RX_ASSIGN_ETHER_TYPE_OFFSET * rule->location;
+	iowrite16(rule->filter.ether_type, addr);
+
+	/* enable rule after all settings are done */
+	addr = adapter->addr + TSNEP_RX_ASSIGN +
+	       TSNEP_RX_ASSIGN_OFFSET * rule->location;
+	iowrite8(rx_assign, addr);
+}
+
+static void tsnep_disable_rule(struct tsnep_adapter *adapter,
+			       struct tsnep_rxnfc_rule *rule)
+{
+	void __iomem *addr;
+
+	addr = adapter->addr + TSNEP_RX_ASSIGN +
+	       TSNEP_RX_ASSIGN_OFFSET * rule->location;
+	iowrite8(0, addr);
+}
+
+static struct tsnep_rxnfc_rule *tsnep_get_rule(struct tsnep_adapter *adapter,
+					       int location)
+{
+	struct tsnep_rxnfc_rule *rule;
+
+	list_for_each_entry(rule, &adapter->rxnfc_rules, list) {
+		if (rule->location == location)
+			return rule;
+		if (rule->location > location)
+			break;
+	}
+
+	return NULL;
+}
+
+static void tsnep_add_rule(struct tsnep_adapter *adapter,
+			   struct tsnep_rxnfc_rule *rule)
+{
+	struct tsnep_rxnfc_rule *pred, *cur;
+
+	tsnep_enable_rule(adapter, rule);
+
+	pred = NULL;
+	list_for_each_entry(cur, &adapter->rxnfc_rules, list) {
+		if (cur->location >= rule->location)
+			break;
+		pred = cur;
+	}
+
+	list_add(&rule->list, pred ? &pred->list : &adapter->rxnfc_rules);
+	adapter->rxnfc_count++;
+}
+
+static void tsnep_delete_rule(struct tsnep_adapter *adapter,
+			      struct tsnep_rxnfc_rule *rule)
+{
+	tsnep_disable_rule(adapter, rule);
+
+	list_del(&rule->list);
+	adapter->rxnfc_count--;
+
+	kfree(rule);
+}
+
+static void tsnep_flush_rules(struct tsnep_adapter *adapter)
+{
+	struct tsnep_rxnfc_rule *rule, *tmp;
+
+	mutex_lock(&adapter->rxnfc_lock);
+
+	list_for_each_entry_safe(rule, tmp, &adapter->rxnfc_rules, list)
+		tsnep_delete_rule(adapter, rule);
+
+	mutex_unlock(&adapter->rxnfc_lock);
+}
+
+int tsnep_rxnfc_get_rule(struct tsnep_adapter *adapter,
+			 struct ethtool_rxnfc *cmd)
+{
+	struct ethtool_rx_flow_spec *fsp = &cmd->fs;
+	struct tsnep_rxnfc_rule *rule = NULL;
+
+	cmd->data = adapter->rxnfc_max;
+
+	mutex_lock(&adapter->rxnfc_lock);
+
+	rule = tsnep_get_rule(adapter, fsp->location);
+	if (!rule) {
+		mutex_unlock(&adapter->rxnfc_lock);
+
+		return -ENOENT;
+	}
+
+	fsp->flow_type = ETHER_FLOW;
+	fsp->ring_cookie = rule->queue_index;
+
+	if (rule->filter.type == TSNEP_RXNFC_ETHER_TYPE) {
+		fsp->h_u.ether_spec.h_proto = htons(rule->filter.ether_type);
+		fsp->m_u.ether_spec.h_proto = ETHER_TYPE_FULL_MASK;
+	}
+
+	mutex_unlock(&adapter->rxnfc_lock);
+
+	return 0;
+}
+
+int tsnep_rxnfc_get_all(struct tsnep_adapter *adapter,
+			struct ethtool_rxnfc *cmd,
+			u32 *rule_locs)
+{
+	struct tsnep_rxnfc_rule *rule;
+	int count = 0;
+
+	cmd->data = adapter->rxnfc_max;
+
+	mutex_lock(&adapter->rxnfc_lock);
+
+	list_for_each_entry(rule, &adapter->rxnfc_rules, list) {
+		if (count == cmd->rule_cnt) {
+			mutex_unlock(&adapter->rxnfc_lock);
+
+			return -EMSGSIZE;
+		}
+
+		rule_locs[count] = rule->location;
+		count++;
+	}
+
+	mutex_unlock(&adapter->rxnfc_lock);
+
+	cmd->rule_cnt = count;
+
+	return 0;
+}
+
+static int tsnep_rxnfc_find_location(struct tsnep_adapter *adapter)
+{
+	struct tsnep_rxnfc_rule *tmp;
+	int location = 0;
+
+	list_for_each_entry(tmp, &adapter->rxnfc_rules, list) {
+		if (tmp->location == location)
+			location++;
+		else
+			return location;
+	}
+
+	if (location >= adapter->rxnfc_max)
+		return -ENOSPC;
+
+	return location;
+}
+
+static void tsnep_rxnfc_init_rule(struct tsnep_rxnfc_rule *rule,
+				  const struct ethtool_rx_flow_spec *fsp)
+{
+	INIT_LIST_HEAD(&rule->list);
+
+	rule->queue_index = fsp->ring_cookie;
+	rule->location = fsp->location;
+
+	rule->filter.type = TSNEP_RXNFC_ETHER_TYPE;
+	rule->filter.ether_type = ntohs(fsp->h_u.ether_spec.h_proto);
+}
+
+static int tsnep_rxnfc_check_rule(struct tsnep_adapter *adapter,
+				  struct tsnep_rxnfc_rule *rule)
+{
+	struct net_device *dev = adapter->netdev;
+	struct tsnep_rxnfc_rule *tmp;
+
+	list_for_each_entry(tmp, &adapter->rxnfc_rules, list) {
+		if (!memcmp(&rule->filter, &tmp->filter, sizeof(rule->filter)) &&
+		    tmp->location != rule->location) {
+			netdev_dbg(dev, "rule already exists\n");
+
+			return -EEXIST;
+		}
+	}
+
+	return 0;
+}
+
+int tsnep_rxnfc_add_rule(struct tsnep_adapter *adapter,
+			 struct ethtool_rxnfc *cmd)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct ethtool_rx_flow_spec *fsp =
+		(struct ethtool_rx_flow_spec *)&cmd->fs;
+	struct tsnep_rxnfc_rule *rule, *old_rule;
+	int retval;
+
+	/* only EtherType is supported */
+	if (fsp->flow_type != ETHER_FLOW ||
+	    !is_zero_ether_addr(fsp->m_u.ether_spec.h_dest) ||
+	    !is_zero_ether_addr(fsp->m_u.ether_spec.h_source) ||
+	    fsp->m_u.ether_spec.h_proto != ETHER_TYPE_FULL_MASK) {
+		netdev_dbg(netdev, "only ethernet protocol is supported\n");
+
+		return -EOPNOTSUPP;
+	}
+
+	if (fsp->ring_cookie >
+	    (TSNEP_RX_ASSIGN_QUEUE_MASK >> TSNEP_RX_ASSIGN_QUEUE_SHIFT)) {
+		netdev_dbg(netdev, "invalid action\n");
+
+		return -EINVAL;
+	}
+
+	if (fsp->location != RX_CLS_LOC_ANY &&
+	    fsp->location >= adapter->rxnfc_max) {
+		netdev_dbg(netdev, "invalid location\n");
+
+		return -EINVAL;
+	}
+
+	rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+	if (!rule)
+		return -ENOMEM;
+
+	mutex_lock(&adapter->rxnfc_lock);
+
+	if (fsp->location == RX_CLS_LOC_ANY) {
+		retval = tsnep_rxnfc_find_location(adapter);
+		if (retval < 0)
+			goto failed;
+		fsp->location = retval;
+	}
+
+	tsnep_rxnfc_init_rule(rule, fsp);
+
+	retval = tsnep_rxnfc_check_rule(adapter, rule);
+	if (retval)
+		goto failed;
+
+	old_rule = tsnep_get_rule(adapter, fsp->location);
+	if (old_rule)
+		tsnep_delete_rule(adapter, old_rule);
+
+	tsnep_add_rule(adapter, rule);
+
+	mutex_unlock(&adapter->rxnfc_lock);
+
+	return 0;
+
+failed:
+	mutex_unlock(&adapter->rxnfc_lock);
+	kfree(rule);
+	return retval;
+}
+
+int tsnep_rxnfc_del_rule(struct tsnep_adapter *adapter,
+			 struct ethtool_rxnfc *cmd)
+{
+	struct ethtool_rx_flow_spec *fsp =
+		(struct ethtool_rx_flow_spec *)&cmd->fs;
+	struct tsnep_rxnfc_rule *rule;
+
+	mutex_lock(&adapter->rxnfc_lock);
+
+	rule = tsnep_get_rule(adapter, fsp->location);
+	if (!rule) {
+		mutex_unlock(&adapter->rxnfc_lock);
+
+		return -ENOENT;
+	}
+
+	tsnep_delete_rule(adapter, rule);
+
+	mutex_unlock(&adapter->rxnfc_lock);
+
+	return 0;
+}
+
+int tsnep_rxnfc_init(struct tsnep_adapter *adapter)
+{
+	int i;
+
+	/* disable all rules */
+	for (i = 0; i < adapter->rxnfc_max;
+	     i += sizeof(u32) / TSNEP_RX_ASSIGN_OFFSET)
+		iowrite32(0, adapter->addr + TSNEP_RX_ASSIGN + i);
+
+	return 0;
+}
+
+void tsnep_rxnfc_cleanup(struct tsnep_adapter *adapter)
+{
+	tsnep_flush_rules(adapter);
+}
-- 
2.30.2

[PATCH net-next v4 6/6] tsnep: Use page pool for RX

[Gerhard Engleder]

Use page pool for RX buffer handling. Makes RX path more efficient and
is required prework for future XDP support.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 drivers/net/ethernet/engleder/Kconfig      |   1 +
 drivers/net/ethernet/engleder/tsnep.h      |   5 +-
 drivers/net/ethernet/engleder/tsnep_main.c | 162 ++++++++++++---------
 3 files changed, 100 insertions(+), 68 deletions(-)

diff --git a/drivers/net/ethernet/engleder/Kconfig b/drivers/net/ethernet/engleder/Kconfig
index f4e2b1102d8f..3df6bf476ae7 100644
--- a/drivers/net/ethernet/engleder/Kconfig
+++ b/drivers/net/ethernet/engleder/Kconfig
@@ -21,6 +21,7 @@ config TSNEP
 	depends on HAS_IOMEM && HAS_DMA
 	depends on PTP_1588_CLOCK_OPTIONAL
 	select PHYLIB
+	select PAGE_POOL
 	help
 	  Support for the Engleder TSN endpoint Ethernet MAC IP Core.
 
diff --git a/drivers/net/ethernet/engleder/tsnep.h b/drivers/net/ethernet/engleder/tsnep.h
index 2ca34ae9b55a..09a723b827c7 100644
--- a/drivers/net/ethernet/engleder/tsnep.h
+++ b/drivers/net/ethernet/engleder/tsnep.h
@@ -96,9 +96,9 @@ struct tsnep_rx_entry {
 
 	u32 properties;
 
-	struct sk_buff *skb;
+	struct page *page;
 	size_t len;
-	DEFINE_DMA_UNMAP_ADDR(dma);
+	dma_addr_t dma;
 };
 
 struct tsnep_rx {
@@ -113,6 +113,7 @@ struct tsnep_rx {
 	int read;
 	u32 owner_counter;
 	int increment_owner_counter;
+	struct page_pool *page_pool;
 
 	u32 packets;
 	u32 bytes;
diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index a6b81f32d76b..8a93d0aa7faa 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -27,10 +27,10 @@
 #include <linux/phy.h>
 #include <linux/iopoll.h>
 
-#define RX_SKB_LENGTH (round_up(TSNEP_RX_INLINE_METADATA_SIZE + ETH_HLEN + \
-				TSNEP_MAX_FRAME_SIZE + ETH_FCS_LEN, 4))
-#define RX_SKB_RESERVE ((16 - TSNEP_RX_INLINE_METADATA_SIZE) + NET_IP_ALIGN)
-#define RX_SKB_ALLOC_LENGTH (RX_SKB_RESERVE + RX_SKB_LENGTH)
+#define TSNEP_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
+#define TSNEP_HEADROOM ALIGN(TSNEP_SKB_PAD, 4)
+#define TSNEP_MAX_RX_BUF_SIZE (PAGE_SIZE - TSNEP_HEADROOM - \
+			       SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 
 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 #define DMA_ADDR_HIGH(dma_addr) ((u32)(((dma_addr) >> 32) & 0xFFFFFFFF))
@@ -587,14 +587,15 @@ static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx)
 
 	for (i = 0; i < TSNEP_RING_SIZE; i++) {
 		entry = &rx->entry[i];
-		if (dma_unmap_addr(entry, dma))
-			dma_unmap_single(dmadev, dma_unmap_addr(entry, dma),
-					 dma_unmap_len(entry, len),
-					 DMA_FROM_DEVICE);
-		if (entry->skb)
-			dev_kfree_skb(entry->skb);
+		if (entry->page)
+			page_pool_put_full_page(rx->page_pool, entry->page,
+						false);
+		entry->page = NULL;
 	}
 
+	if (rx->page_pool)
+		page_pool_destroy(rx->page_pool);
+
 	memset(rx->entry, 0, sizeof(rx->entry));
 
 	for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) {
@@ -607,31 +608,19 @@ static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx)
 	}
 }
 
-static int tsnep_rx_alloc_and_map_skb(struct tsnep_rx *rx,
-				      struct tsnep_rx_entry *entry)
+static int tsnep_rx_alloc_buffer(struct tsnep_rx *rx,
+				 struct tsnep_rx_entry *entry)
 {
-	struct device *dmadev = rx->adapter->dmadev;
-	struct sk_buff *skb;
-	dma_addr_t dma;
+	struct page *page;
 
-	skb = __netdev_alloc_skb(rx->adapter->netdev, RX_SKB_ALLOC_LENGTH,
-				 GFP_ATOMIC | GFP_DMA);
-	if (!skb)
+	page = page_pool_dev_alloc_pages(rx->page_pool);
+	if (unlikely(!page))
 		return -ENOMEM;
 
-	skb_reserve(skb, RX_SKB_RESERVE);
-
-	dma = dma_map_single(dmadev, skb->data, RX_SKB_LENGTH,
-			     DMA_FROM_DEVICE);
-	if (dma_mapping_error(dmadev, dma)) {
-		dev_kfree_skb(skb);
-		return -ENOMEM;
-	}
-
-	entry->skb = skb;
-	entry->len = RX_SKB_LENGTH;
-	dma_unmap_addr_set(entry, dma, dma);
-	entry->desc->rx = __cpu_to_le64(dma);
+	entry->page = page;
+	entry->len = TSNEP_MAX_RX_BUF_SIZE;
+	entry->dma = page_pool_get_dma_addr(entry->page);
+	entry->desc->rx = __cpu_to_le64(entry->dma + TSNEP_SKB_PAD);
 
 	return 0;
 }
@@ -640,6 +629,7 @@ static int tsnep_rx_ring_init(struct tsnep_rx *rx)
 {
 	struct device *dmadev = rx->adapter->dmadev;
 	struct tsnep_rx_entry *entry;
+	struct page_pool_params pp_params = { 0 };
 	struct tsnep_rx_entry *next_entry;
 	int i, j;
 	int retval;
@@ -661,12 +651,28 @@ static int tsnep_rx_ring_init(struct tsnep_rx *rx)
 			entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j;
 		}
 	}
+
+	pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV;
+	pp_params.order = 0;
+	pp_params.pool_size = TSNEP_RING_SIZE;
+	pp_params.nid = dev_to_node(dmadev);
+	pp_params.dev = dmadev;
+	pp_params.dma_dir = DMA_FROM_DEVICE;
+	pp_params.max_len = TSNEP_MAX_RX_BUF_SIZE;
+	pp_params.offset = TSNEP_SKB_PAD;
+	rx->page_pool = page_pool_create(&pp_params);
+	if (IS_ERR(rx->page_pool)) {
+		retval = PTR_ERR(rx->page_pool);
+		rx->page_pool = NULL;
+		goto failed;
+	}
+
 	for (i = 0; i < TSNEP_RING_SIZE; i++) {
 		entry = &rx->entry[i];
 		next_entry = &rx->entry[(i + 1) % TSNEP_RING_SIZE];
 		entry->desc->next = __cpu_to_le64(next_entry->desc_dma);
 
-		retval = tsnep_rx_alloc_and_map_skb(rx, entry);
+		retval = tsnep_rx_alloc_buffer(rx, entry);
 		if (retval)
 			goto failed;
 	}
@@ -682,7 +688,7 @@ static void tsnep_rx_activate(struct tsnep_rx *rx, int index)
 {
 	struct tsnep_rx_entry *entry = &rx->entry[index];
 
-	/* RX_SKB_LENGTH is a multiple of 4 */
+	/* TSNEP_MAX_RX_BUF_SIZE is a multiple of 4 */
 	entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK;
 	entry->properties |= TSNEP_DESC_INTERRUPT_FLAG;
 	if (index == rx->increment_owner_counter) {
@@ -705,19 +711,52 @@ static void tsnep_rx_activate(struct tsnep_rx *rx, int index)
 	entry->desc->properties = __cpu_to_le32(entry->properties);
 }
 
+static struct sk_buff *tsnep_build_skb(struct tsnep_rx *rx, struct page *page,
+				       int length)
+{
+	struct sk_buff *skb;
+
+	skb = napi_build_skb(page_address(page), PAGE_SIZE);
+	if (unlikely(!skb))
+		return NULL;
+
+	/* update pointers within the skb to store the data */
+	skb_reserve(skb, TSNEP_SKB_PAD + TSNEP_RX_INLINE_METADATA_SIZE);
+	__skb_put(skb, length - TSNEP_RX_INLINE_METADATA_SIZE - ETH_FCS_LEN);
+
+	if (rx->adapter->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL) {
+		struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
+		struct tsnep_rx_inline *rx_inline =
+			(struct tsnep_rx_inline *)(page_address(page) +
+						   TSNEP_SKB_PAD);
+
+		skb_shinfo(skb)->tx_flags |=
+			SKBTX_HW_TSTAMP_NETDEV;
+		memset(hwtstamps, 0, sizeof(*hwtstamps));
+		hwtstamps->netdev_data = rx_inline;
+	}
+
+	skb_record_rx_queue(skb, rx->queue_index);
+	skb->protocol = eth_type_trans(skb, rx->adapter->netdev);
+
+	return skb;
+}
+
 static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi,
 			 int budget)
 {
 	struct device *dmadev = rx->adapter->dmadev;
 	int done = 0;
+	enum dma_data_direction dma_dir;
 	struct tsnep_rx_entry *entry;
+	struct page *page;
 	struct sk_buff *skb;
-	size_t len;
-	dma_addr_t dma;
 	int length;
 	bool enable = false;
 	int retval;
 
+	dma_dir = page_pool_get_dma_dir(rx->page_pool);
+
 	while (likely(done < budget)) {
 		entry = &rx->entry[rx->read];
 		if ((__le32_to_cpu(entry->desc_wb->properties) &
@@ -730,43 +769,34 @@ static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi,
 		 */
 		dma_rmb();
 
-		skb = entry->skb;
-		len = dma_unmap_len(entry, len);
-		dma = dma_unmap_addr(entry, dma);
+		prefetch(page_address(entry->page) + TSNEP_SKB_PAD);
+		length = __le32_to_cpu(entry->desc_wb->properties) &
+			 TSNEP_DESC_LENGTH_MASK;
+		dma_sync_single_range_for_cpu(dmadev, entry->dma, TSNEP_SKB_PAD,
+					      length, dma_dir);
+		page = entry->page;
 
 		/* forward skb only if allocation is successful, otherwise
-		 * skb is reused and frame dropped
+		 * page is reused and frame dropped
 		 */
-		retval = tsnep_rx_alloc_and_map_skb(rx, entry);
+		retval = tsnep_rx_alloc_buffer(rx, entry);
 		if (!retval) {
-			dma_unmap_single(dmadev, dma, len, DMA_FROM_DEVICE);
-
-			length = __le32_to_cpu(entry->desc_wb->properties) &
-				 TSNEP_DESC_LENGTH_MASK;
-			skb_put(skb, length - ETH_FCS_LEN);
-			if (rx->adapter->hwtstamp_config.rx_filter ==
-			    HWTSTAMP_FILTER_ALL) {
-				struct skb_shared_hwtstamps *hwtstamps =
-					skb_hwtstamps(skb);
-				struct tsnep_rx_inline *rx_inline =
-					(struct tsnep_rx_inline *)skb->data;
-
-				skb_shinfo(skb)->tx_flags |=
-					SKBTX_HW_TSTAMP_NETDEV;
-				memset(hwtstamps, 0, sizeof(*hwtstamps));
-				hwtstamps->netdev_data = rx_inline;
-			}
-			skb_pull(skb, TSNEP_RX_INLINE_METADATA_SIZE);
-			skb_record_rx_queue(skb, rx->queue_index);
-			skb->protocol = eth_type_trans(skb,
-						       rx->adapter->netdev);
+			skb = tsnep_build_skb(rx, page, length);
+			if (skb) {
+				page_pool_release_page(rx->page_pool, page);
+
+				rx->packets++;
+				rx->bytes += length -
+					     TSNEP_RX_INLINE_METADATA_SIZE;
+				if (skb->pkt_type == PACKET_MULTICAST)
+					rx->multicast++;
 
-			rx->packets++;
-			rx->bytes += length - TSNEP_RX_INLINE_METADATA_SIZE;
-			if (skb->pkt_type == PACKET_MULTICAST)
-				rx->multicast++;
+				napi_gro_receive(napi, skb);
+			} else {
+				page_pool_recycle_direct(rx->page_pool, page);
 
-			napi_gro_receive(napi, skb);
+				rx->dropped++;
+			}
 			done++;
 		} else {
 			rx->dropped++;
-- 
2.30.2

Re: [PATCH net-next v4 0/6] tsnep: multi queue support and some other improvements

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Tue, 27 Sep 2022 21:58:36 +0200 you wrote:
> Add support for additional TX/RX queues along with RX flow classification
> support.
> 
> Binding is extended to allow additional interrupts for additional TX/RX
> queues. Also dma-coherent is allowed as minor improvement.
> 
> RX path optimisation is done by using page pool as preparations for future
> XDP support.
> 
> [...]

Here is the summary with links:
  - [net-next,v4,1/6] dt-bindings: net: tsnep: Allow dma-coherent
    https://git.kernel.org/netdev/net-next/c/ff46c610abd6
  - [net-next,v4,2/6] dt-bindings: net: tsnep: Allow additional interrupts
    https://git.kernel.org/netdev/net-next/c/60e1b494ef88
  - [net-next,v4,3/6] tsnep: Move interrupt from device to queue
    (no matching commit)
  - [net-next,v4,4/6] tsnep: Support multiple TX/RX queue pairs
    https://git.kernel.org/netdev/net-next/c/762031375d5c
  - [net-next,v4,5/6] tsnep: Add EtherType RX flow classification support
    https://git.kernel.org/netdev/net-next/c/308ce1426509
  - [net-next,v4,6/6] tsnep: Use page pool for RX
    https://git.kernel.org/netdev/net-next/c/bb837a37db8d

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH net-next v4 1/6] dt-bindings: net: tsnep: Allow dma-coherent

[Rob Herring]

On Tue, 27 Sep 2022 21:58:37 +0200, Gerhard Engleder wrote:
> Within SoCs like ZynqMP, FPGA logic can be connected to different kinds
> of AXI master ports. Also cache coherent AXI master ports are available.
> The property "dma-coherent" is used to signal that DMA is cache
> coherent.
> 
> Add "dma-coherent" property to allow the configuration of cache coherent
> DMA.
> 
> Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
> ---
>  Documentation/devicetree/bindings/net/engleder,tsnep.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH net-next v4 2/6] dt-bindings: net: tsnep: Allow additional interrupts

[Rob Herring]

On Tue, 27 Sep 2022 21:58:38 +0200, Gerhard Engleder wrote:
> Additional TX/RX queue pairs require dedicated interrupts. Extend
> binding with additional interrupts.
> 
> Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
> ---
>  .../bindings/net/engleder,tsnep.yaml          | 41 ++++++++++++++++++-
>  1 file changed, 39 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>