tests: add tests for netdev flooding race-condition

tests/netdev_flood_flooder/Makefile

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+BOARD ?= samr21-xpro
+
+include ../Makefile.tests_common
+
+# currently only the following network devices are supported by this test
+#   - at86rf2xx
+# so only whitelist boards that have these devices on-board
+BOARD_WHITELIST = fox iotlab-m3 iotlab-a8-m3 mulle samr21-xpro samr30-xpro
+
+DISABLE_MODULE += auto_init
+
+USEMODULE += netdev_default
+USEMODULE += xtimer
+
+include $(RIOTBASE)/Makefile.include

tests/netdev_flood_flooder/README.md

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+# Testing rapidly sending packets while the receiving node tries to reply
+
+## Usage
+
+This test is supposed to be used in tandem with [netdev_flood_replier].
+
+**Before** you start the replier first flash this application to another board
+that supports the same link-layer technology as the device under test on the
+replier:
+
+```sh
+make flash
+```
+
+You can test if everything went right by connecting via terminal to the node
+
+```sh
+make term
+```
+
+If after a reset the following message is shown and no error messages follow,
+the device started flooding successfully
+
+```
+Starting to flood now; start an instance of tests/netdev_flood_replier
+(on a device with matching link-layer ;-)) to see results.
+```
+
+## Support for more devices
+Currently the following devices are supported with this test:
+
+- `at86rf2xx`
+
+To extend the coverage of this test, just add the setup and sending behavior for
+your device in the functions it is documented
+
+```C
+/**
+ * @note    Please amend for more device support
+ */
+```
+
+[netdev_flood_replier]: ../netdev_flood_replier/

tests/netdev_flood_flooder/main.c

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+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#ifdef MODULE_AT86RF2XX
+#include "at86rf2xx.h"
+#include "at86rf2xx_params.h"
+#endif  /* MODULE_AT86RF2XX */
+
+#include "net/netdev.h"
+#include "xtimer.h"
+
+#include "netdev_flood.h"
+
+#if     defined(MODULE_AT86RF2XX)
+#define NETDEV_ADDR_LEN             (2U)
+#define NETDEV_FLOOD_HDR_SEQ_OFFSET (2U)
+/* IEEE 802.15.4 header */
+#define NETDEV_FLOOD_HDR            { 0x71, 0x98, /* FCF */                 \
+                                      0xa1,       /* Sequence number 161 */ \
+                                      0x23, 0x00, /* PAN ID 0x23 */         \
+                                      0x0e, 0x50, /* 0x500e (start of NETDEV_FLOOD_TARGET) */ \
+                                      0x0e, 0x12, /* 0x120e (start of NETDEV_FLOOD_SOURCE) */ }
+#else
+/**
+ * @brief   The address length for the devices
+ *
+ * @note    Please define for your device (try to find a common one)
+ */
+#define NETDEV_ADDR_LEN             (8U)
+
+/**
+ * @brief   The header for the packets that flood the target
+ *
+ * @note    Please define for your device
+ */
+#define NETDEV_FLOOD_HDR            { 0 }
+#error "Board not supported by this test; please provide setup for the " \
+       "board's network device"
+#endif
+
+/**
+ * @brief   The address of the flooding source (in-memory version)
+ */
+static const uint8_t _flood_source[] = NETDEV_FLOOD_SOURCE;
+
+/**
+ * @brief   The header for the packets that flood the target (in-memory version)
+ */
+static uint8_t _flood_hdr[] = NETDEV_FLOOD_HDR;
+
+/**
+ * @brief   The payload for the packets that flood the target (in-memory version)
+ */
+static uint8_t _flood_payload[] = NETDEV_FLOOD_PAYLOAD;
+
+/**
+ * @brief   Payload iolist entry for _flood_payload
+ */
+static iolist_t _flood_payload_ioe = {
+    .iol_next = NULL,
+    .iol_base = _flood_payload,
+    .iol_len = sizeof(_flood_payload),
+};
+
+/**
+ * @brief   The packet to flood the target with
+ */
+static iolist_t _flood_pkt = {
+    .iol_next = &_flood_payload_ioe,
+    .iol_base = _flood_hdr,
+    .iol_len = sizeof(_flood_hdr),
+};
+
+/**
+ * @brief   Setups and initializes the flooding device
+ *
+ * @note    Please amend for more device support
+ */
+static void _setup(void);
+
+/**
+ * @brief   Get's the flooding device as a netdev_t pointer
+ *
+ * @note    Please amend for more device support
+ *
+ * @return  The flooding device as a netdev_t pointer
+ */
+static inline netdev_t *_get_netdev(void);
+
+/**
+ * @brief   Updates _flood_pkt according to the needs of the link-layer of the
+ *          device (e.g. increment sequence number)
+ *
+ * @param[in] dev   The device
+ *
+ * @note    Please amend for more device support
+ */
+static void _update_packet(netdev_t *dev);
+
+/**
+ * @brief   Activates RX complete for the device
+ *
+ * @param[in] dev   The device
+ */
+static void _config_netdev(netdev_t *dev);
+
+/**
+ * @brief   Configures the address to NETDEV_FLOOD_SOURCE of length
+ *          NETDEV_ADDR_LEN for @p dev
+ *
+ * @param[in] dev   The device
+ *
+ * @return  0 on success
+ * @return  -1 on error
+ */
+static inline int _config_address(netdev_t *dev);
+
+int main(void)
+{
+    netdev_t *dev;
+
+    _setup();
+    xtimer_init();
+    dev = _get_netdev();
+    if (dev == NULL) {
+        puts("Board not supported by this test; please provide setup for the "
+             "board's network device");
+        return 1;
+    }
+    dev->driver->init(dev);
+    _config_netdev(dev);
+    if (_config_address(dev) < 0) {
+        puts("Unable to configure address");
+        return 1;
+    }
+    puts("Starting to flood now; start an instance of tests/netdev_flood_replier\n"
+         "(on a device with matching link-layer ;-)) to see results.");
+    while (1) {
+        /* wait for NETDEV_FLOOD_INTERVAL microseconds to send next packet */
+        xtimer_usleep(NETDEV_FLOOD_INTERVAL);
+        if (dev->driver->send(dev, &_flood_pkt) < 0) {
+            puts("Error on send");
+        }
+        _update_packet(dev);
+    }
+    return 0;
+}
+
+#ifdef MODULE_AT86RF2XX
+static at86rf2xx_t at86rf2xx_dev;
+#endif  /* MODULE_AT86RF2XX */
+
+static void _setup(void)
+{
+#ifdef MODULE_AT86RF2XX
+    at86rf2xx_setup(&at86rf2xx_dev, &at86rf2xx_params[0]);
+#endif  /* MODULE_AT86RF2XX */
+}
+
+static inline netdev_t *_get_netdev(void)
+{
+#ifdef MODULE_AT86RF2XX
+    return (netdev_t *)&at86rf2xx_dev;
+#else   /* MODULE_AT86RF2XX */
+    return NULL;
+#endif  /* MODULE_AT86RF2XX */
+}
+
+static void _update_packet(netdev_t *dev)
+{
+#if     defined(MODULE_AT86RF2XX)
+    (void)dev;
+    _flood_hdr[NETDEV_FLOOD_HDR_SEQ_OFFSET]++;
+#endif
+}
+
+static void _config_netdev(netdev_t *dev)
+{
+    static const netopt_enable_t enable = NETOPT_ENABLE;
+    int res = dev->driver->set(dev, NETOPT_RX_END_IRQ, &enable, sizeof(enable));
+
+    if (res < 0) {
+        puts("enable NETOPT_RX_END_IRQ failed");
+    }
+}
+
+static inline int _config_address(netdev_t *dev)
+{
+    if (dev->driver->set(dev, NETOPT_ADDRESS,
+                         _flood_source, NETDEV_ADDR_LEN) < 0) {
+        return -1;
+    }
+    return 0;
+}
+
+/** @} */

tests/netdev_flood_flooder/netdev_flood.h

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+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief   Common definitions for the netdev flood tests
+ *
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ */
+#ifndef NETDEV_FLOOD_H
+#define NETDEV_FLOOD_H
+
+#include "timex.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define NETDEV_FLOOD_PKT_SIZE  (48U) /**< size of NETDEV_FLOOD_PAYLOAD + l2 hdr */
+
+/**
+ * @brief   The payload for the packets that flood the target
+ */
+#define NETDEV_FLOOD_PAYLOAD   { 0x53, 0x6f, 0x20, 0x73, 0x6f, 0x72, 0x72, 0x79, \
+                                 0x20, 0x66, 0x6f, 0x72, 0x20, 0x66, 0x6c, 0x6f, \
+                                 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x20, 0x79, 0x6f, \
+                                 0x75, 0x72, 0x20, 0x6e, 0x65, 0x74, 0x77, 0x6f, \
+                                 0x72, 0x6b, 0x21, 0x20, 0x3e, 0x2e, 0x3c }
+
+/**
+ * @brief   The address of the flooding source
+ */
+#define NETDEV_FLOOD_SOURCE    { 0x12, 0x0e, 0x2e, 0x0a, 0xf0, 0xc4, 0xb1, 0xe7 }
+
+/**
+ * @brief   The address of the flooding target
+ */
+#define NETDEV_FLOOD_TARGET    { 0x50, 0x0e, 0x61, 0xf2, 0xde, 0x44, 0x8f, 0xb4 }
+
+/**
+ * @brief   Flood interval in micro seconds
+ */
+#define NETDEV_FLOOD_INTERVAL  (5 * US_PER_MS)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETDEV_FLOOD_H */
+/** @} */

tests/netdev_flood_replier/Makefile

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+BOARD ?= samr21-xpro
+
+include ../Makefile.tests_common
+
+# currently only the following network devices are supported by this test
+#   - at86rf2xx
+# so only whitelist boards that have these devices on-board
+BOARD_WHITELIST = fox iotlab-m3 iotlab-a8-m3 mulle samr21-xpro samr30-xpro
+
+DISABLE_MODULE += auto_init
+
+USEMODULE += event
+USEMODULE += event_timeout
+USEMODULE += netdev_default
+USEMODULE += od
+
+INCLUDES += -I$(RIOTBASE)/tests/netdev_flood_flooder/
+
+include $(RIOTBASE)/Makefile.include

tests/netdev_flood_replier/README.md

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+# Testing rapidly received packets while sending replies
+
+## Usage
+
+This test is supposed to be used in tandem with [netdev_flood_flooder].
+
+It is supposed to test a bug in network devices where an incoming packet is
+overwitten by a sent packet before it is read by the upper layer.
+
+Start the flooder first (see README there) and then flash this application and
+run the test
+
+```sh
+make flash
+make test
+```
+
+If there is no output for a while, the test was successful.
+
+## Support for more devices
+Currently the following devices are supported with this test:
+
+- `at86rf2xx`
+
+To extend the coverage of this test, just add the setup, sending, and reception
+behavior for your device in the functions it is documented
+
+```C
+/**
+ * @note    Please amend for more device support
+ */
+```
+
+[netdev_flood_flooder]: ../netdev_flood_flooder/