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net: add skb_queue_purge_reason and __skb_queue_purge_reason 

skb_queue_purge() and __skb_queue_purge() become wrappers
around the new generic functions.

New SKB_DROP_REASON_QUEUE_PURGE drop reason is added,
but users can start adding more specific reasons.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-08-18 09:40:39 +00:00 committed by David S. Miller
parent 5b0a1414e0
commit 4025d3e73a
3 changed files with 29 additions and 8 deletions
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23
include/linux/skbuff.h
View File

@ -3149,20 +3149,35 @@ static inline int skb_orphan_frags_rx(struct sk_buff *skb, gfp_t gfp_mask)
}
/**
* __skb_queue_purge - empty a list
* __skb_queue_purge_reason - empty a list
* @list: list to empty
* @reason: drop reason
*
* Delete all buffers on an &sk_buff list. Each buffer is removed from
* the list and one reference dropped. This function does not take the
* list lock and the caller must hold the relevant locks to use it.
*/
static inline void __skb_queue_purge(struct sk_buff_head *list)
static inline void __skb_queue_purge_reason(struct sk_buff_head *list,
enum skb_drop_reason reason)
{
struct sk_buff *skb;
while ((skb = __skb_dequeue(list)) != NULL)
kfree_skb(skb);
kfree_skb_reason(skb, reason);
}
static inline void __skb_queue_purge(struct sk_buff_head *list)
{
__skb_queue_purge_reason(list, SKB_DROP_REASON_QUEUE_PURGE);
}
void skb_queue_purge_reason(struct sk_buff_head *list,
enum skb_drop_reason reason);
static inline void skb_queue_purge(struct sk_buff_head *list)
{
skb_queue_purge_reason(list, SKB_DROP_REASON_QUEUE_PURGE);
}
void skb_queue_purge(struct sk_buff_head *list);
unsigned int skb_rbtree_purge(struct rb_root *root);

3
include/net/dropreason-core.h
View File

@ -79,6 +79,7 @@
FN(IPV6_NDISC_BAD_CODE) \
FN(IPV6_NDISC_BAD_OPTIONS) \
FN(IPV6_NDISC_NS_OTHERHOST) \
FN(QUEUE_PURGE) \
FNe(MAX)
/**
@ -342,6 +343,8 @@ enum skb_drop_reason {
* for another host.
*/
SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST,
/** @SKB_DROP_REASON_QUEUE_PURGE: bulk free. */
SKB_DROP_REASON_QUEUE_PURGE,
/**
* @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which
* shouldn't be used as a real 'reason' - only for tracing code gen

11
net/core/skbuff.c
View File

@ -3701,20 +3701,23 @@ struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list)
EXPORT_SYMBOL(skb_dequeue_tail);
/**
* skb_queue_purge - empty a list
* skb_queue_purge_reason - empty a list
* @list: list to empty
* @reason: drop reason
*
* Delete all buffers on an &sk_buff list. Each buffer is removed from
* the list and one reference dropped. This function takes the list
* lock and is atomic with respect to other list locking functions.
*/
void skb_queue_purge(struct sk_buff_head *list)
void skb_queue_purge_reason(struct sk_buff_head *list,
enum skb_drop_reason reason)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(list)) != NULL)
kfree_skb(skb);
kfree_skb_reason(skb, reason);
}
EXPORT_SYMBOL(skb_queue_purge);
EXPORT_SYMBOL(skb_queue_purge_reason);
/**
* skb_rbtree_purge - empty a skb rbtree