devemu_pci_device_hotplug_main.c

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/*
 * Copyright (c) 2023-2024 NVIDIA CORPORATION AND AFFILIATES.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
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 *       conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this list of
 *       conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
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 *       to endorse or promote products derived from this software without specific prior written
 *       permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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 */
 
#include <stdlib.h>
#include <string.h>
 
#include <doca_argp.h>
#include <doca_error.h>
#include <doca_dev.h>
#include <doca_log.h>
 
#include <devemu_pci_common.h>
 
DOCA_LOG_REGISTER(DPU_DEVEMU_PCI_DEVICE_HOTPLUG::MAIN);
 
/* Sample's Logic */
doca_error_t devemu_pci_device_hotplug(const char *pci_address, const char *unplug_vuid);
 
/* Configuration struct */
struct devemu_pci_cfg {
    char pci_address[DOCA_DEVINFO_PCI_ADDR_SIZE]; /* device PCI address */
    char vuid[DOCA_DEVINFO_REP_VUID_SIZE];        /* VUID of emulated device to unplug */
};
 
/*
 * ARGP Callback - Handle PCI device address parameter
 *
 * @param [in]: Input parameter
 * @config [in/out]: Program configuration context
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise
 */
static doca_error_t pci_callback(void *param, void *config)
{
    struct devemu_pci_cfg *conf = (struct devemu_pci_cfg *)config;
    const char *addr = (char *)param;
 
    return parse_pci_address(addr, conf->pci_address);
}
 
/*
 * ARGP Callback - Handle VUID parameter
 *
 * @param [in]: Input parameter
 * @config [in/out]: Program configuration context
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise
 */
static doca_error_t vuid_callback(void *param, void *config)
{
    struct devemu_pci_cfg *conf = (struct devemu_pci_cfg *)config;
    const char *vuid = (char *)param;
 
    return parse_vuid(vuid, conf->vuid);
}
 
/*
 * Register the command line parameters for the sample
 *
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise
 */
static doca_error_t register_devemu_pci_params(void)
{
    doca_error_t result;
 
    result = register_pci_address_param(pci_callback);
    if (result != DOCA_SUCCESS)
        return result;
 
    result = register_vuid_param(
        "DOCA Devemu emulated device VUID. If provided then the given device will be hotunplugged",
        vuid_callback);
    if (result != DOCA_SUCCESS)
        return result;
 
    return DOCA_SUCCESS;
}
 
/*
 * Sample main function
 *
 * @argc [in]: command line arguments size
 * @argv [in]: array of command line arguments
 * @return: EXIT_SUCCESS on success and EXIT_FAILURE otherwise
 */
int main(int argc, char **argv)
{
    struct devemu_pci_cfg devemu_pci_cfg;
    char *vuid = NULL;
    doca_error_t result;
    struct doca_log_backend *sdk_log;
    int exit_status = EXIT_FAILURE;
 
    /* Set the default configuration values (Example values) */
    strcpy(devemu_pci_cfg.pci_address, "0000:03:00.0");
    strcpy(devemu_pci_cfg.vuid, "");
 
    /* Register a logger backend */
    result = doca_log_backend_create_standard();
    if (result != DOCA_SUCCESS)
        goto sample_exit;
 
    /* Register a logger backend for internal SDK errors and warnings */
    result = doca_log_backend_create_with_file_sdk(stderr, &sdk_log);
    if (result != DOCA_SUCCESS)
        goto sample_exit;
    result = doca_log_backend_set_sdk_level(sdk_log, DOCA_LOG_LEVEL_WARNING);
    if (result != DOCA_SUCCESS)
        goto sample_exit;
 
    DOCA_LOG_INFO("Starting the sample");
 
    result = doca_argp_init(NULL, &devemu_pci_cfg);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to init ARGP resources: %s", doca_error_get_descr(result));
        goto sample_exit;
    }
    result = register_devemu_pci_params();
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to register sample command line parameters: %s", doca_error_get_descr(result));
        goto argp_cleanup;
    }
    result = doca_argp_start(argc, argv);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to parse sample input: %s", doca_error_get_descr(result));
        goto argp_cleanup;
    }
 
#ifdef DOCA_ARCH_DPU
 
    if (*devemu_pci_cfg.vuid != 0)
        vuid = devemu_pci_cfg.vuid;
 
    result = devemu_pci_device_hotplug(devemu_pci_cfg.pci_address, vuid);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("devemu_pci_device_hotplug() encountered an error: %s", doca_error_get_descr(result));
        goto argp_cleanup;
    }
 
    exit_status = EXIT_SUCCESS;
 
#else // DOCA_ARCH_DPU
 
    (void)vuid;
    DOCA_LOG_ERR("Hotplug PCI Emulated Device can run only on the DPU");
    exit_status = EXIT_FAILURE;
 
#endif // DOCA_ARCH_DPU
 
argp_cleanup:
    doca_argp_destroy();
 
sample_exit:
    if (exit_status == EXIT_SUCCESS)
        DOCA_LOG_INFO("Sample finished successfully");
    else
        DOCA_LOG_INFO("Sample finished with errors");
    return exit_status;
}