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net: dropreason: add SKB_CONSUMED reason 

This will allow to simply use in the future:

	kfree_skb_reason(skb, reason);

Instead of repeating sequences like:

	if (dropped)
	    kfree_skb_reason(skb, reason);
	else
	    consume_skb(skb);

For instance, following patch in the series is adding
@reason to skb_release_data() and skb_release_all(),
so that we can propagate a meaningful @reason whenever
consume_skb()/kfree_skb() have to take care of a potential frag_list.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-10-29 15:45:16 +00:00 committed by Jakub Kicinski
parent b98deb2f98
commit 0e84afe8eb
2 changed files with 7 additions and 1 deletions
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2
include/net/dropreason.h
View File

@ -80,6 +80,8 @@ enum skb_drop_reason {
* @SKB_NOT_DROPPED_YET: skb is not dropped yet (used for no-drop case)
*/
SKB_NOT_DROPPED_YET = 0,
/** @SKB_CONSUMED: packet has been consumed */
SKB_CONSUMED,
/** @SKB_DROP_REASON_NOT_SPECIFIED: drop reason is not specified */
SKB_DROP_REASON_NOT_SPECIFIED,
/** @SKB_DROP_REASON_NO_SOCKET: socket not found */

6
net/core/skbuff.c
View File

@ -94,6 +94,7 @@ EXPORT_SYMBOL(sysctl_max_skb_frags);
#undef FN
#define FN(reason) [SKB_DROP_REASON_##reason] = #reason,
const char * const drop_reasons[] = {
[SKB_CONSUMED] = "CONSUMED",
DEFINE_DROP_REASON(FN, FN)
};
EXPORT_SYMBOL(drop_reasons);
@ -894,7 +895,10 @@ kfree_skb_reason(struct sk_buff *skb, enum skb_drop_reason reason)
DEBUG_NET_WARN_ON_ONCE(reason <= 0 || reason >= SKB_DROP_REASON_MAX);
trace_kfree_skb(skb, __builtin_return_address(0), reason);
if (reason == SKB_CONSUMED)
trace_consume_skb(skb);
else
trace_kfree_skb(skb, __builtin_return_address(0), reason);
__kfree_skb(skb);
}
EXPORT_SYMBOL(kfree_skb_reason);