devemu_pci_device_dma_host_main.c

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/*
 * Copyright (c) 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:
 *     * Redistributions of source code must retain the above copyright notice, this list of
 *       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.
 *     * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
 *       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
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
 
#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_host_common.h>
 
#define MEM_BUF_LEN (4 * 1024) /* Mem buffer size. It's the same as DPU side*/
 
DOCA_LOG_REGISTER(DEVEMU_PCI_DEVICE_DMA_HOST::MAIN);
 
/* Sample's Logic */
doca_error_t devemu_pci_device_dma_host(const char *pci_address, int vfio_group, const char *write_data);
 
/* Configuration struct */
struct devemu_pci_cfg {
    char pci_address[DOCA_DEVINFO_PCI_ADDR_SIZE]; /* Emulated device PCI address */
    char write_data[MEM_BUF_LEN];             /* Data to write to DPU memory */
    int vfio_group;                   /* The VFIO group ID of the emulated device */
};
 
#ifndef DOCA_ARCH_DPU
 
/*
 * 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_emulated_pci_address(addr, conf->pci_address);
}
 
/*
 * ARGP Callback - Handle VFIO Group ID parameter
 *
 * @param [in]: Input parameter
 * @config [in/out]: Program configuration context
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise
 */
static doca_error_t vfio_group_callback(void *param, void *config)
{
    struct devemu_pci_cfg *conf = (struct devemu_pci_cfg *)config;
    int group_id = *(int *)param;
 
    if (group_id < 0) {
        DOCA_LOG_ERR("Entered VFIO group ID, is invalid. Must be positive integer. Received %d", group_id);
        return DOCA_ERROR_INVALID_VALUE;
    }
 
    conf->vfio_group = group_id;
 
    return DOCA_SUCCESS;
}
 
/*
 * ARGP Callback - Handle Stateful Region Index parameter
 *
 * @param [in]: Input parameter
 * @config [in/out]: Program configuration context
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise
 */
static doca_error_t write_data_callback(void *param, void *config)
{
    struct devemu_pci_cfg *conf = (struct devemu_pci_cfg *)config;
    const char *write_data = (char *)param;
    int data_len = strnlen(write_data, MEM_BUF_LEN) + 1;
 
    /* Check using > to make static code analysis satisfied */
    if (data_len > MEM_BUF_LEN) {
        DOCA_LOG_ERR("Entered write data exceeds max memory buffer size of %d", MEM_BUF_LEN - 1);
        return DOCA_ERROR_INVALID_VALUE;
    }
 
    strncpy(conf->write_data, write_data, data_len - 1);
    conf->write_data[data_len - 1] = 0;
 
    return DOCA_SUCCESS;
}
 
/*
 * Register write data command line parameter
 *
 * @write_data_callback [in]: Callback called for parsing the write data command line param
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise
 */
static doca_error_t register_write_data_param(doca_argp_param_cb_t write_data_callback)
{
    struct doca_argp_param *write_data_param;
    doca_error_t result;
 
    result = doca_argp_param_create(&write_data_param);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to create ARGP param: %s", doca_error_get_descr(result));
        return result;
    }
    doca_argp_param_set_short_name(write_data_param, "w");
    doca_argp_param_set_long_name(write_data_param, "write-data");
    doca_argp_param_set_description(
        write_data_param,
        "Data to write to DPU memory, if not provided then the sample will do a read instead. ASCII string");
    doca_argp_param_set_callback(write_data_param, write_data_callback);
    doca_argp_param_set_type(write_data_param, DOCA_ARGP_TYPE_STRING);
    result = doca_argp_register_param(write_data_param);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to register program param: %s", doca_error_get_descr(result));
        return result;
    }
 
    return DOCA_SUCCESS;
}
 
/*
 * 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_emulated_pci_address_param(pci_callback);
    if (result != DOCA_SUCCESS)
        return result;
 
    result = register_vfio_group_param(vfio_group_callback);
    if (result != DOCA_SUCCESS)
        return result;
 
    result = register_write_data_param(write_data_callback);
    if (result != DOCA_SUCCESS)
        return result;
 
    return DOCA_SUCCESS;
}
 
#endif // DOCA_ARCH_DPU
 
/*
 * 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;
    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, "");
    strcpy(devemu_pci_cfg.write_data, "This is a sample piece of data from Host!");
    devemu_pci_cfg.vfio_group = -1;
 
    /* 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_INFO);
    if (result != DOCA_SUCCESS)
        goto sample_exit;
 
    DOCA_LOG_INFO("Starting the sample");
 
#ifndef DOCA_ARCH_DPU
 
    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;
    }
 
    if (*devemu_pci_cfg.pci_address == 0) {
        DOCA_LOG_ERR("The PCI address parameter is missing");
        goto argp_cleanup;
    }
    if (devemu_pci_cfg.vfio_group == -1) {
        DOCA_LOG_ERR("The VFIO group ID parameter is missing");
        goto argp_cleanup;
    }
 
    result = devemu_pci_device_dma_host(devemu_pci_cfg.pci_address,
                        devemu_pci_cfg.vfio_group,
                        devemu_pci_cfg.write_data);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("devemu_pci_device_host() encountered an error: %s", doca_error_get_descr(result));
        goto argp_cleanup;
    }
 
    exit_status = EXIT_SUCCESS;
 
argp_cleanup:
    doca_argp_destroy();
 
#else // DOCA_ARCH_DPU
    (void)argc;
    (void)argv;
 
    DOCA_LOG_ERR("PCI Emulated Device DMA Host can run only on the Host");
    exit_status = EXIT_FAILURE;
 
#endif // DOCA_ARCH_DPU
 
sample_exit:
    if (exit_status == EXIT_SUCCESS)
        DOCA_LOG_INFO("Sample finished successfully");
    else
        DOCA_LOG_INFO("Sample finished with errors");
    return exit_status;
}