[PATCH 2/5] sandbox: Add a DSA sandbox driver and unit test

The DSA sandbox driver is used for unit testing the DSA class code. It implements a simple 2 port switch plus 1 CPU port, and uses a very simple tag to identify the ports. The DSA sandbox device is connected via CPU port to a regular Ethernet sandbox device, called 'dsa-test-eth, managed by the existing eth sandbox driver. The 'dsa-test-eth' is not intended for testing the eth class code however, but it is used to emulate traffic through the 'lan0' and 'lan1' front pannel switch ports. To achieve this the dsa sandbox driver registers a tx handler for the 'dsa-test-eth' device. The switch ports, labeled as 'lan0' and 'lan1', are also registered as eth devices by the dsa class code this time. So pinging through these switch ports is as easy as: => setenv ethact lan0 => ping 1.2.3.5

Unit tests for the dsa class code were also added. The 'dsa_probe' test exercises most API functions from dsa.h. The 'dsa' unit test simply exercises ARP/ICMP traffic through the two switch ports, including tag injection and extraction, with the help of the dsa sandbox driver. I took care to minimize the impact on the existing eth unit tests, though some adjustments needed to be made with the addition of extra eth interfaces used by the dsa unit tests. The additional eth interfaces also require MAC addresses, these have been added to the sandbox default environment.

Signed-off-by: Alex Marginean alexandru.marginean@nxp.com Signed-off-by: Claudiu Manoil claudiu.manoil@nxp.com --- arch/Kconfig | 1 + arch/sandbox/dts/test.dts | 40 +++++++++ drivers/net/Kconfig | 9 ++ drivers/net/Makefile | 1 + drivers/net/dsa_sandbox.c | 181 ++++++++++++++++++++++++++++++++++++++ include/configs/sandbox.h | 2 + test/dm/Makefile | 1 + test/dm/dsa.c | 91 +++++++++++++++++++ test/dm/eth.c | 10 +-- 9 files changed, 331 insertions(+), 5 deletions(-) create mode 100644 drivers/net/dsa_sandbox.c create mode 100644 test/dm/dsa.c

diff --git a/arch/Kconfig b/arch/Kconfig index 27843cd79c..8a8130f0c8 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -160,6 +160,7 @@ config SANDBOX imply CMD_CLONE imply SILENT_CONSOLE imply BOOTARGS_SUBST + imply DM_DSA

config SH bool "SuperH architecture" diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts index c9b9b7b75e..8e85b343db 100644 --- a/arch/sandbox/dts/test.dts +++ b/arch/sandbox/dts/test.dts @@ -14,7 +14,9 @@ aliases { console = &uart0; eth0 = "/eth@10002000"; + eth2 = &swp_0; eth3 = &eth_3; + eth4 = &dsa_eth0; eth5 = &eth_5; gpio1 = &gpio_a; gpio2 = &gpio_b; @@ -375,6 +377,44 @@ fake-host-hwaddr = [00 00 66 44 22 22]; };

+ dsa_eth0: dsa-test-eth { + compatible = "sandbox,eth"; + reg = <0x10006000 0x1000>; + fake-host-hwaddr = [00 00 66 44 22 66]; + }; + + dsa-test { + compatible = "sandbox,dsa"; + + ports { + #address-cells = <1>; + #size-cells = <0>; + swp_0: port@0 { + reg = <0>; + label = "lan0"; + }; + + swp_1: port@1 { + reg = <1>; + label = "lan1"; + phy-mode = "rgmii-txid"; + fixed-link { + speed = <100>; + full-duplex; + }; + }; + + port@2 { + reg = <2>; + ethernet = <&dsa_eth0>; + fixed-link { + speed = <1000>; + full-duplex; + }; + }; + }; + }; + firmware { sandbox_firmware: sandbox-firmware { compatible = "sandbox,firmware"; diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 382224d04c..214aebf14a 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -77,6 +77,15 @@ config DM_ETH_PHY help Enable driver model for Ethernet Generic PHY .

+config DSA_SANDBOX + depends on DM_DSA && SANDBOX + default y + bool "Sandbox: Mocked DSA driver" + help + This driver implements a dummy DSA switch connected to a dummy sandbox + Ethernet device used as DSA master, to test DSA class code, including + exported DSA API and datapath processing of Ethernet traffic. + menuconfig NETDEVICES bool "Network device support" depends on NET diff --git a/drivers/net/Makefile b/drivers/net/Makefile index e3bdda359d..545fbbc0ce 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_ETH_DESIGNWARE_SOCFPGA) += dwmac_socfpga.o obj-$(CONFIG_ETH_DESIGNWARE_S700) += dwmac_s700.o obj-$(CONFIG_DRIVER_DM9000) += dm9000x.o obj-$(CONFIG_DNET) += dnet.o +obj-$(CONFIG_DSA_SANDBOX) += dsa_sandbox.o obj-$(CONFIG_DM_ETH_PHY) += eth-phy-uclass.o obj-$(CONFIG_E1000) += e1000.o obj-$(CONFIG_E1000_SPI) += e1000_spi.o diff --git a/drivers/net/dsa_sandbox.c b/drivers/net/dsa_sandbox.c new file mode 100644 index 0000000000..44548df86a --- /dev/null +++ b/drivers/net/dsa_sandbox.c @@ -0,0 +1,181 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2019-2021 NXP + */ + +#include <asm/eth.h> +#include <net/dsa.h> +#include <net.h> + +#define DSA_SANDBOX_MAGIC 0x00415344 +#define DSA_SANDBOX_TAG_LEN sizeof(struct dsa_sandbox_tag) + +struct dsa_sandbox_priv { + struct eth_sandbox_priv *master_priv; + int port_en_mask; +}; + +struct dsa_sandbox_tag { + u32 magic; + u32 port; +}; + +static bool sb_dsa_port_enabled(struct udevice *dev, int port) +{ + struct dsa_sandbox_priv *priv = dev_get_priv(dev); + + return priv->port_en_mask & BIT(port); +} + +static bool sb_dsa_master_enabled(struct udevice *dev) +{ + struct dsa_sandbox_priv *priv = dev_get_priv(dev); + + return !priv->master_priv->disabled; +} + +static int dsa_sandbox_port_enable(struct udevice *dev, int port, + struct phy_device *phy) +{ + struct dsa_sandbox_priv *priv = dev_get_priv(dev); + + if (!sb_dsa_master_enabled(dev)) + return -EFAULT; + + priv->port_en_mask |= 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_get_priv(dev); + + priv->port_en_mask &= ~BIT(port); +} + +static int dsa_sandbox_xmit(struct udevice *dev, int port, void *packet, + int length) +{ + struct dsa_sandbox_tag *tag = packet; + + if (!sb_dsa_master_enabled(dev)) + return -EFAULT; + + if (!sb_dsa_port_enabled(dev, 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_tag *tag = packet; + + if (!sb_dsa_master_enabled(dev)) + return -EFAULT; + + if (tag->magic != DSA_SANDBOX_MAGIC) + return -EFAULT; + + *port = tag->port; + if (!sb_dsa_port_enabled(dev, tag->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 sb_dsa_handler(struct udevice *dev, void *packet, + unsigned int len) +{ + struct eth_sandbox_priv *master_priv; + struct dsa_sandbox_tag *tag = packet; + struct udevice *pdev, *dsa_dev; + u32 port_index; + void *rx_buf; + int i; + + /* this emulates the switch hw and the network side */ + if (tag->magic != DSA_SANDBOX_MAGIC) + return -EFAULT; + + port_index = tag->port; + master_priv = dev_get_priv(dev); + dsa_dev = master_priv->priv; + if (!sb_dsa_port_enabled(dsa_dev, port_index)) + return -EFAULT; + + pdev = dsa_get_port_by_index(dsa_dev, port_index); + + packet += DSA_SANDBOX_TAG_LEN; + len -= DSA_SANDBOX_TAG_LEN; + + if (!sandbox_eth_arp_req_to_reply(dev, packet, len)) + goto dsa_tagging; + if (!sandbox_eth_ping_req_to_reply(dev, packet, len)) + goto dsa_tagging; + + return 0; + +dsa_tagging: + master_priv->recv_packets--; + i = master_priv->recv_packets; + rx_buf = master_priv->recv_packet_buffer[i]; + len = master_priv->recv_packet_length[i]; + memmove(rx_buf + DSA_SANDBOX_TAG_LEN, rx_buf, len); + + tag = rx_buf; + tag->magic = DSA_SANDBOX_MAGIC; + tag->port = port_index; + len += DSA_SANDBOX_TAG_LEN; + master_priv->recv_packet_length[i] = len; + master_priv->recv_packets++; + + return 0; +} + +static int dsa_sandbox_probe(struct udevice *dev) +{ + struct dsa_sandbox_priv *priv = dev_get_priv(dev); + struct udevice *master = dsa_get_master(dev); + struct eth_sandbox_priv *master_priv; + + if (!master) + return -ENODEV; + + dsa_set_tagging(dev, DSA_SANDBOX_TAG_LEN, 0); + + master_priv = dev_get_priv(master); + master_priv->priv = dev; + master_priv->tx_handler = sb_dsa_handler; + + priv->master_priv = master_priv; + + 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, + .probe = dsa_sandbox_probe, + .ops = &dsa_sandbox_ops, + .priv_auto = sizeof(struct dsa_sandbox_priv), +}; diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h index e0708fe573..91f636b2c1 100644 --- a/include/configs/sandbox.h +++ b/include/configs/sandbox.h @@ -93,7 +93,9 @@ #endif

#define SANDBOX_ETH_SETTINGS "ethaddr=00:00:11:22:33:44\0" \ + "eth2addr=00:00:11:22:33:48\0" \ "eth3addr=00:00:11:22:33:45\0" \ + "eth4addr=00:00:11:22:33:48\0" \ "eth5addr=00:00:11:22:33:46\0" \ "eth6addr=00:00:11:22:33:47\0" \ "ipaddr=1.2.3.4\0" diff --git a/test/dm/Makefile b/test/dm/Makefile index 46e076ed09..c14363cf9d 100644 --- a/test/dm/Makefile +++ b/test/dm/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_DM_BOOTCOUNT) += bootcount.o obj-$(CONFIG_CLK) += clk.o clk_ccf.o obj-$(CONFIG_DEVRES) += devres.o obj-$(CONFIG_VIDEO_MIPI_DSI) += dsi_host.o +obj-$(CONFIG_DM_DSA) += dsa.o obj-$(CONFIG_DM_ETH) += eth.o obj-$(CONFIG_FIRMWARE) += firmware.o obj-$(CONFIG_DM_GPIO) += gpio.o diff --git a/test/dm/dsa.c b/test/dm/dsa.c new file mode 100644 index 0000000000..e2cd4b7d3b --- /dev/null +++ b/test/dm/dsa.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2020-2021 NXP + */ + +#include <net/dsa.h> +#include <dm/test.h> +#include <test/ut.h> +#include <net.h> +#include <dm/uclass-internal.h> +#include <dm/device-internal.h> + +/* This test exercises the major dsa.h API functions, after making sure + * that the DSA ports and the master Eth are correctly probed. + */ +static int dm_test_dsa_probe(struct unit_test_state *uts) +{ + struct udevice *dev_dsa, *dev_port, *dev_master; + struct dsa_port_pdata *port_pdata; + struct dsa_pdata *dsa_pdata; + enum uclass_id id; + int n; + + id = uclass_get_by_name("dsa"); + ut_assert(id == UCLASS_DSA); + + ut_assertok(uclass_find_device_by_name(UCLASS_DSA, "dsa-test", + &dev_dsa)); + ut_assertok(uclass_find_device_by_name(UCLASS_ETH, "dsa-test-eth", + &dev_master)); + ut_assertok(device_probe(dev_master)); + + ut_assertok(uclass_find_device_by_name(UCLASS_ETH, "dsa-test@0", + &dev_port)); + ut_assertok(device_probe(dev_port)); + + ut_assertok(uclass_find_device_by_name(UCLASS_ETH, "dsa-test@1", + &dev_port)); + ut_assertok(device_probe(dev_port)); + + /* exercise DSA API */ + dsa_pdata = dev_get_uclass_plat(dev_dsa); + ut_assertnonnull(dsa_pdata); + /* includes CPU port */ + ut_assert(dsa_pdata->num_ports == 3); + + n = 0; + dsa_foreach_port(dev_port, dev_dsa) { + char name[DSA_PORT_NAME_LENGTH]; + + port_pdata = dsa_port_get_pdata(dev_port); + ut_assertnonnull(port_pdata); + + snprintf(name, DSA_PORT_NAME_LENGTH, "lan%d", n); + ut_asserteq_str(name, port_pdata->name); + n++; + } + + debug("active non-CPU ports: %d\n", n); + ut_assert(n == 2); + + dev_master = dsa_get_master(dev_dsa); + ut_assertnonnull(dev_master); + ut_asserteq_str("dsa-test-eth", dev_master->name); + + return 0; +} + +DM_TEST(dm_test_dsa_probe, UT_TESTF_SCAN_FDT); + +/* This test sends ping requests with the local address through each DSA port + * via the sandbox DSA master Eth. + */ +static int dm_test_dsa(struct unit_test_state *uts) +{ + net_ping_ip = string_to_ip("1.2.3.5"); + + env_set("ethact", "eth2"); + ut_assertok(net_loop(PING)); + + env_set("ethact", "lan0"); + ut_assertok(net_loop(PING)); + env_set("ethact", "lan1"); + ut_assertok(net_loop(PING)); + + env_set("ethact", ""); + + return 0; +} + +DM_TEST(dm_test_dsa, UT_TESTF_SCAN_FDT); diff --git a/test/dm/eth.c b/test/dm/eth.c index fa8a69da70..e4ee695610 100644 --- a/test/dm/eth.c +++ b/test/dm/eth.c @@ -53,8 +53,8 @@ static int dm_test_eth_alias(struct unit_test_state *uts) ut_assertok(net_loop(PING)); ut_asserteq_str("eth@10004000", env_get("ethact"));

- /* Expected to fail since eth2 is not defined in the device tree */ - env_set("ethact", "eth2"); + /* Expected to fail since eth1 is not defined in the device tree */ + env_set("ethact", "eth1"); ut_assertok(net_loop(PING)); ut_asserteq_str("eth@10002000", env_get("ethact"));

@@ -227,7 +227,7 @@ static int _dm_test_net_retry(struct unit_test_state *uts) * the active device should be eth0 */ sandbox_eth_disable_response(1, true); - env_set("ethact", "eth@10004000"); + env_set("ethact", "lan1"); env_set("netretry", "yes"); sandbox_eth_skip_timeout(); ut_assertok(net_loop(PING)); @@ -237,11 +237,11 @@ static int _dm_test_net_retry(struct unit_test_state *uts) * eth1 is disabled and netretry is no, so the ping should fail and the * active device should be eth1 */ - env_set("ethact", "eth@10004000"); + env_set("ethact", "lan1"); env_set("netretry", "no"); sandbox_eth_skip_timeout(); ut_asserteq(-ENONET, net_loop(PING)); - ut_asserteq_str("eth@10004000", env_get("ethact")); + ut_asserteq_str("lan1", env_get("ethact"));

return 0; }