netdev - [PATCH net-next] net: add skb_queue_purge_reason and __skb_queue_purge

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Message-ID: <20230818094039.3630187-1-edumazet@google.com>
Date: Fri, 18 Aug 2023 09:40:39 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next] 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@...gle.com>
---
 include/linux/skbuff.h        | 23 +++++++++++++++++++----
 include/net/dropreason-core.h |  3 +++
 net/core/skbuff.c             | 11 +++++++----
 3 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index aa57e2eca33be01d6d1d55297a8ffcdb5b6a1f55..9aec136bc6901ee4f99b7af7cd126a57babd0cb8 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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);
 
diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index f291a3b0f9e512bd933b961caa4368367c3c5c6c..a587e83fc1694100a2357f81e999d7810b0d1ff7 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -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
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 33fdf04d4334dd71481bc1ecf7c131aff8f18826..061caf2a3021483bb859ee31c9b19291180e0f7f 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -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
-- 
2.42.0.rc1.204.g551eb34607-goog