include/net/netdev_rx_queue.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_NETDEV_RX_QUEUE_H
#define _LINUX_NETDEV_RX_QUEUE_H

#include <linux/kobject.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include <net/xdp.h>
#include <net/page_pool/types.h>
#include <net/netdev_queues.h>
#include <net/rps-types.h>

/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
	struct xdp_rxq_info		xdp_rxq;
#ifdef CONFIG_RPS
	struct rps_map __rcu		*rps_map;
	rps_tag_ptr			rps_flow_table;
#endif
	struct kobject			kobj;
	const struct attribute_group	**groups;
	struct net_device		*dev;
	netdevice_tracker		dev_tracker;

	/* All fields below are "ops protected",
	 * see comment about net_device::lock
	 */
#ifdef CONFIG_XDP_SOCKETS
	struct xsk_buff_pool            *pool;
#endif
	struct napi_struct		*napi;
	struct netdev_queue_config	qcfg;
	struct pp_memory_provider_params mp_params;

	/* If a queue is leased, then the lease pointer is always
	 * valid. From the physical device it points to the virtual
	 * queue, and from the virtual device it points to the
	 * physical queue.
	 */
	struct netdev_rx_queue		*lease;
	netdevice_tracker		lease_tracker;
} ____cacheline_aligned_in_smp;

/*
 * RX queue sysfs structures and functions.
 */
struct rx_queue_attribute {
	struct attribute attr;
	ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
	ssize_t (*store)(struct netdev_rx_queue *queue,
			 const char *buf, size_t len);
};

static inline struct netdev_rx_queue *
__netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
{
	return dev->_rx + rxq;
}

static inline unsigned int
get_netdev_rx_queue_index(struct netdev_rx_queue *queue)
{
	struct net_device *dev = queue->dev;
	int index = queue - dev->_rx;

	BUG_ON(index >= dev->num_rx_queues);
	return index;
}

enum netif_lease_dir {
	NETIF_VIRT_TO_PHYS,
	NETIF_PHYS_TO_VIRT,
};

struct netdev_rx_queue *
__netif_get_rx_queue_lease(struct net_device **dev, unsigned int *rxq,
			   enum netif_lease_dir dir);

int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq);
void netdev_rx_queue_lease(struct netdev_rx_queue *rxq_dst,
			   struct netdev_rx_queue *rxq_src);
void netdev_rx_queue_unlease(struct netdev_rx_queue *rxq_dst,
			     struct netdev_rx_queue *rxq_src);
#endif /* _LINUX_NETDEV_RX_QUEUE_H */