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/*
* Definitions for the 'struct skb_array' datastructure.
*
* Author:
* Michael S. Tsirkin <mst@redhat.com>
*
* Copyright (C) 2016 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* Limited-size FIFO of skbs. Can be used more or less whenever
* sk_buff_head can be used, except you need to know the queue size in
* advance.
* Implemented as a type-safe wrapper around ptr_ring.
*/
#ifndef _LINUX_SKB_ARRAY_H
#define _LINUX_SKB_ARRAY_H 1
#ifdef __KERNEL__
#include <linux/ptr_ring.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#endif
struct skb_array {
struct ptr_ring ring;
};
/* Might be slightly faster than skb_array_full below, but callers invoking
* this in a loop must use a compiler barrier, for example cpu_relax().
*/
static inline bool __skb_array_full(struct skb_array *a)
{
return __ptr_ring_full(&a->ring);
}
static inline bool skb_array_full(struct skb_array *a)
{
return ptr_ring_full(&a->ring);
}
static inline int skb_array_produce(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce(&a->ring, skb);
}
static inline int skb_array_produce_irq(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce_irq(&a->ring, skb);
}
static inline int skb_array_produce_bh(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce_bh(&a->ring, skb);
}
static inline int skb_array_produce_any(struct skb_array *a, struct sk_buff *skb)
{
return ptr_ring_produce_any(&a->ring, skb);
}
/* Might be slightly faster than skb_array_empty below, but only safe if the
* array is never resized. Also, callers invoking this in a loop must take care
* to use a compiler barrier, for example cpu_relax().
*/
static inline bool __skb_array_empty(struct skb_array *a)
{
return !__ptr_ring_peek(&a->ring);
}
static inline bool skb_array_empty(struct skb_array *a)
{
return ptr_ring_empty(&a->ring);
}
static inline bool skb_array_empty_bh(struct skb_array *a)
{
return ptr_ring_empty_bh(&a->ring);
}
static inline bool skb_array_empty_irq(struct skb_array *a)
{
return ptr_ring_empty_irq(&a->ring);
}
static inline bool skb_array_empty_any(struct skb_array *a)
{
return ptr_ring_empty_any(&a->ring);
}
static inline struct sk_buff *skb_array_consume(struct skb_array *a)
{
return ptr_ring_consume(&a->ring);
}
static inline struct sk_buff *skb_array_consume_irq(struct skb_array *a)
{
return ptr_ring_consume_irq(&a->ring);
}
static inline struct sk_buff *skb_array_consume_any(struct skb_array *a)
{
return ptr_ring_consume_any(&a->ring);
}
static inline struct sk_buff *skb_array_consume_bh(struct skb_array *a)
{
return ptr_ring_consume_bh(&a->ring);
}
static inline int __skb_array_len_with_tag(struct sk_buff *skb)
{
if (likely(skb)) {
int len = skb->len;
if (skb_vlan_tag_present(skb))
len += VLAN_HLEN;
return len;
} else {
return 0;
}
}
static inline int skb_array_peek_len(struct skb_array *a)
{
return PTR_RING_PEEK_CALL(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_peek_len_irq(struct skb_array *a)
{
return PTR_RING_PEEK_CALL_IRQ(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_peek_len_bh(struct skb_array *a)
{
return PTR_RING_PEEK_CALL_BH(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_peek_len_any(struct skb_array *a)
{
return PTR_RING_PEEK_CALL_ANY(&a->ring, __skb_array_len_with_tag);
}
static inline int skb_array_init(struct skb_array *a, int size, gfp_t gfp)
{
return ptr_ring_init(&a->ring, size, gfp);
}
static void __skb_array_destroy_skb(void *ptr)
{
kfree_skb(ptr);
}
static inline int skb_array_resize(struct skb_array *a, int size, gfp_t gfp)
{
return ptr_ring_resize(&a->ring, size, gfp, __skb_array_destroy_skb);
}
static inline int skb_array_resize_multiple(struct skb_array **rings,
int nrings, int size, gfp_t gfp)
{
BUILD_BUG_ON(offsetof(struct skb_array, ring));
return ptr_ring_resize_multiple((struct ptr_ring **)rings,
nrings, size, gfp,
__skb_array_destroy_skb);
}
static inline void skb_array_cleanup(struct skb_array *a)
{
ptr_ring_cleanup(&a->ring, __skb_array_destroy_skb);
}
#endif /* _LINUX_SKB_ARRAY_H */
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