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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/net/core/netdev_config.c
121797 views
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// SPDX-License-Identifier: GPL-2.0-only

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#include <linux/netdevice.h>

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#include <net/netdev_queues.h>

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#include <net/netdev_rx_queue.h>

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#include "dev.h"

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static int netdev_nop_validate_qcfg(struct net_device *dev,

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				    struct netdev_queue_config *qcfg,

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				    struct netlink_ext_ack *extack)

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{

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	return 0;

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}

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static int __netdev_queue_config(struct net_device *dev, int rxq_idx,

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				 struct netdev_queue_config *qcfg,

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				 struct netlink_ext_ack *extack,

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				 bool validate)

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{

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	int (*validate_cb)(struct net_device *dev,

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			   struct netdev_queue_config *qcfg,

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			   struct netlink_ext_ack *extack);

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	struct pp_memory_provider_params *mpp;

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	int err;

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	validate_cb = netdev_nop_validate_qcfg;

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	if (validate && dev->queue_mgmt_ops->ndo_validate_qcfg)

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		validate_cb = dev->queue_mgmt_ops->ndo_validate_qcfg;

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	memset(qcfg, 0, sizeof(*qcfg));

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	/* Get defaults from the driver, in case user config not set */

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	if (dev->queue_mgmt_ops->ndo_default_qcfg)

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		dev->queue_mgmt_ops->ndo_default_qcfg(dev, qcfg);

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	err = validate_cb(dev, qcfg, extack);

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	if (err)

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		return err;

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	/* Apply MP overrides */

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	mpp = &__netif_get_rx_queue(dev, rxq_idx)->mp_params;

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	if (mpp->rx_page_size)

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		qcfg->rx_page_size = mpp->rx_page_size;

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	err = validate_cb(dev, qcfg, extack);

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	if (err)

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		return err;

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	return 0;

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}

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/**

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 * netdev_queue_config() - get configuration for a given queue

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 * @dev:      net_device instance

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 * @rxq_idx:  index of the queue of interest

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 * @qcfg: queue configuration struct (output)

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 *

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 * Render the configuration for a given queue. This helper should be used

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 * by drivers which support queue configuration to retrieve config for

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 * a particular queue.

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 *

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 * @qcfg is an output parameter and is always fully initialized by this

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 * function. Some values may not be set by the user, drivers may either

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 * deal with the "unset" values in @qcfg, or provide the callback

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 * to populate defaults in queue_management_ops.

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 */

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void netdev_queue_config(struct net_device *dev, int rxq_idx,

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			 struct netdev_queue_config *qcfg)

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{

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	__netdev_queue_config(dev, rxq_idx, qcfg, NULL, false);

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}

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EXPORT_SYMBOL(netdev_queue_config);

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int netdev_queue_config_validate(struct net_device *dev, int rxq_idx,

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				 struct netdev_queue_config *qcfg,

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				 struct netlink_ext_ack *extack)

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{

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	return __netdev_queue_config(dev, rxq_idx, qcfg, extack, true);

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}

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