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60 lines
1.9 KiB
60 lines
1.9 KiB
8 years ago
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From abc24ef7a69f54c3317beea98078831ba9bfa2cd Mon Sep 17 00:00:00 2001
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From: Madalin Bucur <madalin.bucur@freescale.com>
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Date: Tue, 5 Jan 2016 12:12:07 +0200
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Subject: [PATCH 19/70] net: readd skb_recycle()
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Adding back skb_recycle() as it's used by the DPAA Ethernet driver.
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This was removed from the upstream kernel because it was lacking users.
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Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com>
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---
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include/linux/skbuff.h | 1 +
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net/core/skbuff.c | 26 ++++++++++++++++++++++++++
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2 files changed, 27 insertions(+)
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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -799,6 +799,7 @@ void kfree_skb(struct sk_buff *skb);
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void kfree_skb_list(struct sk_buff *segs);
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void skb_tx_error(struct sk_buff *skb);
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void consume_skb(struct sk_buff *skb);
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+void skb_recycle(struct sk_buff *skb);
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void __kfree_skb(struct sk_buff *skb);
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extern struct kmem_cache *skbuff_head_cache;
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--- a/net/core/skbuff.c
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+++ b/net/core/skbuff.c
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@@ -766,6 +766,32 @@ void consume_skb(struct sk_buff *skb)
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}
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EXPORT_SYMBOL(consume_skb);
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+/**
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+ * skb_recycle - clean up an skb for reuse
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+ * @skb: buffer
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+ *
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+ * Recycles the skb to be reused as a receive buffer. This
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+ * function does any necessary reference count dropping, and
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+ * cleans up the skbuff as if it just came from __alloc_skb().
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+ */
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+void skb_recycle(struct sk_buff *skb)
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+{
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+ struct skb_shared_info *shinfo;
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+ u8 head_frag = skb->head_frag;
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+
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+ skb_release_head_state(skb);
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+
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+ shinfo = skb_shinfo(skb);
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+ memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
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+ atomic_set(&shinfo->dataref, 1);
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+
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+ memset(skb, 0, offsetof(struct sk_buff, tail));
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+ skb->data = skb->head + NET_SKB_PAD;
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+ skb->head_frag = head_frag;
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+ skb_reset_tail_pointer(skb);
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+}
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+EXPORT_SYMBOL(skb_recycle);
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+
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/* Make sure a field is enclosed inside headers_start/headers_end section */
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#define CHECK_SKB_FIELD(field) \
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BUILD_BUG_ON(offsetof(struct sk_buff, field) < \
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