[U-Boot] [PATCH 2/6] drivers: net: add a DSA sandbox driver
Alex Marginean
alexandru.marginean at nxp.com
Fri Nov 22 01:36:55 UTC 2019
The DSA sandbox driver is used for DSA unit testing. It implements a
simple 4 port switch that uses a very simple tag to identify the ports.
The DSA driver comes paired with an Ethernet driver that loops packets
back and can selectively filter traffic on DSA switch ports.
Signed-off-by: Alex Marginean <alexandru.marginean at nxp.com>
---
drivers/net/Kconfig | 8 ++
drivers/net/Makefile | 1 +
drivers/net/dsa_sandbox.c | 272 ++++++++++++++++++++++++++++++++++++++
3 files changed, 281 insertions(+)
create mode 100644 drivers/net/dsa_sandbox.c
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index a4157cb122..ac420cb474 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -70,6 +70,14 @@ config MDIO_MUX_SANDBOX
This driver is used for testing in test/dm/mdio.c
+config DSA_SANDBOX
+ depends on DM_DSA && SANDBOX
+ default y
+ bool "Sandbox: Mocked DSA driver"
+ help
+ This driver implements a dummy switch and a dummy Ethernet device used
+ to test DSA class code.
+
menuconfig NETDEVICES
bool "Network device support"
depends on NET
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 30991834ec..8be49f6335 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -82,3 +82,4 @@ obj-y += mscc_eswitch/
obj-$(CONFIG_HIGMACV300_ETH) += higmacv300.o
obj-$(CONFIG_MDIO_SANDBOX) += mdio_sandbox.o
obj-$(CONFIG_FSL_ENETC) += fsl_enetc.o fsl_enetc_mdio.o
+obj-$(CONFIG_DSA_SANDBOX) += dsa_sandbox.o
diff --git a/drivers/net/dsa_sandbox.c b/drivers/net/dsa_sandbox.c
new file mode 100644
index 0000000000..07230eb033
--- /dev/null
+++ b/drivers/net/dsa_sandbox.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019 NXP
+ */
+
+#include <dsa.h>
+
+#define DSA_SANDBOX_MAGIC 0x00415344
+#define DSA_SANDBOX_TAG_LEN sizeof(struct dsa_sandbox_tag)
+/*
+ * This global flag is used to enable DSA just for DSA test so it doesn't affect
+ * the existing eth unit test.
+ */
+int dsa_sandbox_port_mask;
+
+struct dsa_sandbox_priv {
+ int enabled;
+ int port_enabled;
+};
+
+struct dsa_sandbox_tag {
+ u32 magic;
+ u32 port;
+};
+
+static int dsa_sandbox_port_enable(struct udevice *dev, int port,
+ struct phy_device *phy)
+{
+ struct dsa_sandbox_priv *priv = dev->priv;
+
+ if (!priv->enabled)
+ return -EFAULT;
+
+ priv->port_enabled |= BIT(port);
+
+ return 0;
+}
+
+static void dsa_sandbox_port_disable(struct udevice *dev, int port,
+ struct phy_device *phy)
+{
+ struct dsa_sandbox_priv *priv = dev->priv;
+
+ if (!priv->enabled)
+ return;
+
+ priv->port_enabled &= ~BIT(port);
+}
+
+static int dsa_sandbox_xmit(struct udevice *dev, int port, void *packet,
+ int length)
+{
+ struct dsa_sandbox_priv *priv = dev->priv;
+ struct dsa_sandbox_tag *tag = packet;
+
+ if (!priv->enabled)
+ return -EFAULT;
+
+ if (!(priv->port_enabled & BIT(port)))
+ return -EFAULT;
+
+ tag->magic = DSA_SANDBOX_MAGIC;
+ tag->port = port;
+
+ return 0;
+}
+
+static int dsa_sandbox_rcv(struct udevice *dev, int *port, void *packet,
+ int length)
+{
+ struct dsa_sandbox_priv *priv = dev->priv;
+ struct dsa_sandbox_tag *tag = packet;
+
+ if (!priv->enabled)
+ return -EFAULT;
+
+ if (tag->magic != DSA_SANDBOX_MAGIC)
+ return -EFAULT;
+
+ *port = tag->port;
+ if (!(priv->port_enabled & BIT(*port)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static const struct dsa_ops dsa_sandbox_ops = {
+ .port_enable = dsa_sandbox_port_enable,
+ .port_disable = dsa_sandbox_port_disable,
+ .xmit = dsa_sandbox_xmit,
+ .rcv = dsa_sandbox_rcv,
+};
+
+static int dsa_sandbox_bind(struct udevice *dev)
+{
+ struct dsa_perdev_platdata *pdata = dev->platdata;
+
+ /* must be at least 4 to match sandbox test DT */
+ pdata->num_ports = 4;
+ pdata->headroom = DSA_SANDBOX_TAG_LEN;
+
+ return 0;
+}
+
+static int dsa_sandbox_probe(struct udevice *dev)
+{
+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
+
+ /*
+ * return error if DSA is not being tested so we don't break existing
+ * eth test.
+ */
+ if (!dsa_sandbox_port_mask)
+ return -EINVAL;
+
+ priv->enabled = 1;
+
+ return 0;
+}
+
+static int dsa_sandbox_remove(struct udevice *dev)
+{
+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
+
+ priv->enabled = 0;
+
+ return 0;
+}
+
+static const struct udevice_id dsa_sandbox_ids[] = {
+ { .compatible = "sandbox,dsa" },
+ { }
+};
+
+U_BOOT_DRIVER(dsa_sandbox) = {
+ .name = "dsa_sandbox",
+ .id = UCLASS_DSA,
+ .of_match = dsa_sandbox_ids,
+ .bind = dsa_sandbox_bind,
+ .probe = dsa_sandbox_probe,
+ .remove = dsa_sandbox_remove,
+ .ops = &dsa_sandbox_ops,
+ .priv_auto_alloc_size = sizeof(struct dsa_sandbox_priv),
+ .platdata_auto_alloc_size = sizeof(struct dsa_perdev_platdata),
+};
+
+struct dsa_sandbox_eth_priv {
+ int enabled;
+ int started;
+ int packet_length;
+ uchar packet[DSA_MAX_FRAME_SIZE];
+};
+
+static int dsa_eth_sandbox_start(struct udevice *dev)
+{
+ struct dsa_sandbox_eth_priv *priv = dev->priv;
+
+ if (!priv->enabled)
+ return -EFAULT;
+
+ priv->started = 1;
+
+ return 0;
+}
+
+static void dsa_eth_sandbox_stop(struct udevice *dev)
+{
+ struct dsa_sandbox_eth_priv *priv = dev->priv;
+
+ if (!priv->enabled)
+ return;
+
+ priv->started = 0;
+}
+
+static int dsa_eth_sandbox_send(struct udevice *dev, void *packet, int length)
+{
+ struct dsa_sandbox_eth_priv *priv = dev->priv;
+ struct dsa_sandbox_tag *tag = packet;
+
+ if (!priv->enabled || !priv->started)
+ return -EFAULT;
+
+ memcpy(priv->packet, packet, length);
+ priv->packet_length = length;
+
+ /*
+ * for DSA test frames we only respond if the associated port is enabled
+ * in the dsa test port mask
+ */
+
+ if (tag->magic == DSA_SANDBOX_MAGIC) {
+ int port = tag->port;
+
+ if (!(dsa_sandbox_port_mask & BIT(port)))
+ /* drop the frame, port is not enabled */
+ priv->packet_length = 0;
+ }
+
+ return 0;
+}
+
+static int dsa_eth_sandbox_recv(struct udevice *dev, int flags, uchar **packetp)
+{
+ struct dsa_sandbox_eth_priv *priv = dev->priv;
+ int length = priv->packet_length;
+
+ if (!priv->enabled || !priv->started)
+ return -EFAULT;
+
+ if (!length) {
+ /* no frames pending, force a time-out */
+ timer_test_add_offset(100);
+ return -EAGAIN;
+ }
+
+ *packetp = priv->packet;
+ priv->packet_length = 0;
+
+ return length;
+}
+
+static const struct eth_ops dsa_eth_sandbox_ops = {
+ .start = dsa_eth_sandbox_start,
+ .send = dsa_eth_sandbox_send,
+ .recv = dsa_eth_sandbox_recv,
+ .stop = dsa_eth_sandbox_stop,
+};
+
+static int dsa_eth_sandbox_bind(struct udevice *dev)
+{
+ return 0;
+}
+
+static int dsa_eth_sandbox_probe(struct udevice *dev)
+{
+ struct dsa_sandbox_eth_priv *priv = dev->priv;
+
+ priv->enabled = 1;
+
+ /*
+ * return error if DSA is not being tested do we don't break existing
+ * eth test.
+ */
+ return dsa_sandbox_port_mask ? 0 : -EINVAL;
+}
+
+static int dsa_eth_sandbox_remove(struct udevice *dev)
+{
+ struct dsa_sandbox_eth_priv *priv = dev->priv;
+
+ priv->enabled = 0;
+
+ return 0;
+}
+
+static const struct udevice_id dsa_eth_sandbox_ids[] = {
+ { .compatible = "sandbox,dsa-eth" },
+ { }
+};
+
+U_BOOT_DRIVER(dsa_eth_sandbox) = {
+ .name = "dsa_eth_sandbox",
+ .id = UCLASS_ETH,
+ .of_match = dsa_eth_sandbox_ids,
+ .bind = dsa_eth_sandbox_bind,
+ .probe = dsa_eth_sandbox_probe,
+ .remove = dsa_eth_sandbox_remove,
+ .ops = &dsa_eth_sandbox_ops,
+ .platdata_auto_alloc_size = sizeof(struct eth_pdata),
+ .priv_auto_alloc_size = sizeof(struct dsa_sandbox_eth_priv),
+};
--
2.17.1
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