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/* SPDX-License-Identifier: GPL-2.0 */
/* AF_XDP internal functions
* Copyright(c) 2018 Intel Corporation.
*/
#ifndef _LINUX_XDP_SOCK_H
#define _LINUX_XDP_SOCK_H
#include <linux/bpf.h>
#include <linux/workqueue.h>
#include <linux/if_xdp.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <net/sock.h>
#define XDP_UMEM_SG_FLAG (1 << 1)
struct net_device;
struct xsk_queue;
struct xdp_buff;
struct xdp_umem {
void *addrs;
u64 size;
u32 headroom;
u32 chunk_size;
u32 chunks;
u32 npgs;
struct user_struct *user;
refcount_t users;
u8 flags;
bool zc;
struct page **pgs;
int id;
struct list_head xsk_dma_list;
struct work_struct work;
};
struct xsk_map {
struct bpf_map map;
spinlock_t lock; /* Synchronize map updates */
atomic_t count;
struct xdp_sock __rcu *xsk_map[];
};
struct xdp_sock {
/* struct sock must be the first member of struct xdp_sock */
struct sock sk;
struct xsk_queue *rx ____cacheline_aligned_in_smp;
struct net_device *dev;
struct xdp_umem *umem;
struct list_head flush_node;
struct xsk_buff_pool *pool;
u16 queue_id;
bool zc;
bool sg;
enum {
XSK_READY = 0,
XSK_BOUND,
XSK_UNBOUND,
} state;
struct xsk_queue *tx ____cacheline_aligned_in_smp;
struct list_head tx_list;
/* record the number of tx descriptors sent by this xsk and
* when it exceeds MAX_PER_SOCKET_BUDGET, an opportunity needs
* to be given to other xsks for sending tx descriptors, thereby
* preventing other XSKs from being starved.
*/
u32 tx_budget_spent;
/* Protects generic receive. */
spinlock_t rx_lock;
/* Statistics */
u64 rx_dropped;
u64 rx_queue_full;
/* When __xsk_generic_xmit() must return before it sees the EOP descriptor for the current
* packet, the partially built skb is saved here so that packet building can resume in next
* call of __xsk_generic_xmit().
*/
struct sk_buff *skb;
struct list_head map_list;
/* Protects map_list */
spinlock_t map_list_lock;
/* Protects multiple processes in the control path */
struct mutex mutex;
struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */
struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */
};
#ifdef CONFIG_XDP_SOCKETS
int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp);
int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp);
void __xsk_map_flush(void);
#else
static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
{
return -ENOTSUPP;
}
static inline int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
{
return -EOPNOTSUPP;
}
static inline void __xsk_map_flush(void)
{
}
#endif /* CONFIG_XDP_SOCKETS */
#if defined(CONFIG_XDP_SOCKETS) && defined(CONFIG_DEBUG_NET)
bool xsk_map_check_flush(void);
#else
static inline bool xsk_map_check_flush(void)
{
return false;
}
#endif
#endif /* _LINUX_XDP_SOCK_H */
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