rte_ethdev_pci.h

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2017 Brocade Communications Systems, Inc.
 *   Author: Jan Blunck <jblunck@infradead.org>
 *
 *   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 copyright holder 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 THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS 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 TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_ETHDEV_PCI_H_
#define _RTE_ETHDEV_PCI_H_

#include <rte_malloc.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
#include <rte_config.h>
#include <rte_ethdev.h>

static inline void
rte_eth_copy_pci_info(struct rte_eth_dev *eth_dev,
    struct rte_pci_device *pci_dev)
{
    if ((eth_dev == NULL) || (pci_dev == NULL)) {
        RTE_PMD_DEBUG_TRACE("NULL pointer eth_dev=%p pci_dev=%p\n",
                eth_dev, pci_dev);
        return;
    }

    eth_dev->intr_handle = &pci_dev->intr_handle;

    eth_dev->data->dev_flags = 0;
    if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_LSC)
        eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
    if (pci_dev->driver->drv_flags & RTE_PCI_DRV_INTR_RMV)
        eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_RMV;

    eth_dev->data->kdrv = pci_dev->kdrv;
    eth_dev->data->numa_node = pci_dev->device.numa_node;
}

static inline struct rte_eth_dev *
rte_eth_dev_pci_allocate(struct rte_pci_device *dev, size_t private_data_size)
{
    struct rte_eth_dev *eth_dev;
    const char *name;

    if (!dev)
        return NULL;

    name = dev->device.name;

    if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
        eth_dev = rte_eth_dev_allocate(name);
        if (!eth_dev)
            return NULL;

        if (private_data_size) {
            eth_dev->data->dev_private = rte_zmalloc_socket(name,
                private_data_size, RTE_CACHE_LINE_SIZE,
                dev->device.numa_node);
            if (!eth_dev->data->dev_private) {
                rte_eth_dev_release_port(eth_dev);
                return NULL;
            }
        }
    } else {
        eth_dev = rte_eth_dev_attach_secondary(name);
        if (!eth_dev)
            return NULL;
    }

    eth_dev->device = &dev->device;
    rte_eth_copy_pci_info(eth_dev, dev);
    return eth_dev;
}

static inline void
rte_eth_dev_pci_release(struct rte_eth_dev *eth_dev)
{
    if (rte_eal_process_type() == RTE_PROC_PRIMARY)
        rte_free(eth_dev->data->dev_private);

    eth_dev->data->dev_private = NULL;

    /*
     * Secondary process will check the name to attach.
     * Clear this field to avoid attaching a released ports.
     */
    eth_dev->data->name[0] = '\0';

    eth_dev->device = NULL;
    eth_dev->intr_handle = NULL;

    /* free ether device */
    rte_eth_dev_release_port(eth_dev);
}

typedef int (*eth_dev_pci_callback_t)(struct rte_eth_dev *eth_dev);

static inline int
rte_eth_dev_pci_generic_probe(struct rte_pci_device *pci_dev,
    size_t private_data_size, eth_dev_pci_callback_t dev_init)
{
    struct rte_eth_dev *eth_dev;
    int ret;

    eth_dev = rte_eth_dev_pci_allocate(pci_dev, private_data_size);
    if (!eth_dev)
        return -ENOMEM;

    RTE_FUNC_PTR_OR_ERR_RET(*dev_init, -EINVAL);
    ret = dev_init(eth_dev);
    if (ret)
        rte_eth_dev_pci_release(eth_dev);

    return ret;
}

static inline int
rte_eth_dev_pci_generic_remove(struct rte_pci_device *pci_dev,
    eth_dev_pci_callback_t dev_uninit)
{
    struct rte_eth_dev *eth_dev;
    int ret;

    eth_dev = rte_eth_dev_allocated(pci_dev->device.name);
    if (!eth_dev)
        return -ENODEV;

    if (dev_uninit) {
        ret = dev_uninit(eth_dev);
        if (ret)
            return ret;
    }

    rte_eth_dev_pci_release(eth_dev);
    return 0;
}

#endif /* _RTE_ETHDEV_PCI_H_ */