1 files changed, 95 insertions, 0 deletions
diff --git a/net/rxrpc/skbuff.c b/net/rxrpc/skbuff.c
new file mode 100644
index 000000000..580a5acff
--- /dev/null
+++ b/net/rxrpc/skbuff.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* ar-skbuff.c: socket buffer destruction handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+#define is_tx_skb(skb) (rxrpc_skb(skb)->rx_flags & RXRPC_SKB_TX_BUFFER)
+#define select_skb_count(skb) (is_tx_skb(skb) ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)
+
+/*
+ * Note the allocation or reception of a socket buffer.
+ */
+void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
+{
+	const void *here = __builtin_return_address(0);
+	int n = atomic_inc_return(select_skb_count(skb));
+	trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
+			rxrpc_skb(skb)->rx_flags, here);
+}
+
+/*
+ * Note the re-emergence of a socket buffer from a queue or buffer.
+ */
+void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
+{
+	const void *here = __builtin_return_address(0);
+	if (skb) {
+		int n = atomic_read(select_skb_count(skb));
+		trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
+				rxrpc_skb(skb)->rx_flags, here);
+	}
+}
+
+/*
+ * Note the addition of a ref on a socket buffer.
+ */
+void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
+{
+	const void *here = __builtin_return_address(0);
+	int n = atomic_inc_return(select_skb_count(skb));
+	trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
+			rxrpc_skb(skb)->rx_flags, here);
+	skb_get(skb);
+}
+
+/*
+ * Note the dropping of a ref on a socket buffer by the core.
+ */
+void rxrpc_eaten_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
+{
+	const void *here = __builtin_return_address(0);
+	int n = atomic_inc_return(&rxrpc_n_rx_skbs);
+	trace_rxrpc_skb(skb, op, 0, n, 0, here);
+}
+
+/*
+ * Note the destruction of a socket buffer.
+ */
+void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
+{
+	const void *here = __builtin_return_address(0);
+	if (skb) {
+		int n;
+		n = atomic_dec_return(select_skb_count(skb));
+		trace_rxrpc_skb(skb, op, refcount_read(&skb->users), n,
+				rxrpc_skb(skb)->rx_flags, here);
+		kfree_skb(skb);
+	}
+}
+
+/*
+ * Clear a queue of socket buffers.
+ */
+void rxrpc_purge_queue(struct sk_buff_head *list)
+{
+	const void *here = __builtin_return_address(0);
+	struct sk_buff *skb;
+	while ((skb = skb_dequeue((list))) != NULL) {
+		int n = atomic_dec_return(select_skb_count(skb));
+		trace_rxrpc_skb(skb, rxrpc_skb_purged,
+				refcount_read(&skb->users), n,
+				rxrpc_skb(skb)->rx_flags, here);
+		kfree_skb(skb);
+	}
+}