layerscape: add 64b/32b target for ls1043ardb device

[openwrt/openwrt.git] / target / linux / layerscape / patches-4.4 / 7019-net-readd-skb_recycle.patch

diff --git a/target/linux/layerscape/patches-4.4/7019-net-readd-skb_recycle.patch b/target/linux/layerscape/patches-4.4/7019-net-readd-skb_recycle.patch
new file mode 100644 (file)
index 0000000..062233f
--- /dev/null
+++ b/target/linux/layerscape/patches-4.4/7019-net-readd-skb_recycle.patch
@@ -0,0 +1,59 @@
+From abc24ef7a69f54c3317beea98078831ba9bfa2cd Mon Sep 17 00:00:00 2001
+From: Madalin Bucur <madalin.bucur@freescale.com>
+Date: Tue, 5 Jan 2016 12:12:07 +0200
+Subject: [PATCH 19/70] net: readd skb_recycle()
+
+Adding back skb_recycle() as it's used by the DPAA Ethernet driver.
+This was removed from the upstream kernel because it was lacking users.
+
+Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com>
+---
+ include/linux/skbuff.h |    1 +
+ net/core/skbuff.c      |   26 ++++++++++++++++++++++++++
+ 2 files changed, 27 insertions(+)
+
+--- a/include/linux/skbuff.h
++++ b/include/linux/skbuff.h
+@@ -799,6 +799,7 @@ void kfree_skb(struct sk_buff *skb);
+ void kfree_skb_list(struct sk_buff *segs);
+ void skb_tx_error(struct sk_buff *skb);
+ void consume_skb(struct sk_buff *skb);
++void skb_recycle(struct sk_buff *skb);
+ void  __kfree_skb(struct sk_buff *skb);
+ extern struct kmem_cache *skbuff_head_cache;
+ 
+--- a/net/core/skbuff.c
++++ b/net/core/skbuff.c
+@@ -766,6 +766,32 @@ void consume_skb(struct sk_buff *skb)
+ }
+ EXPORT_SYMBOL(consume_skb);
+ 
++/**
++ *    skb_recycle - clean up an skb for reuse
++ *    @skb: buffer
++ *
++ *    Recycles the skb to be reused as a receive buffer. This
++ *    function does any necessary reference count dropping, and
++ *    cleans up the skbuff as if it just came from __alloc_skb().
++ */
++void skb_recycle(struct sk_buff *skb)
++{
++      struct skb_shared_info *shinfo;
++      u8 head_frag = skb->head_frag;
++
++      skb_release_head_state(skb);
++
++      shinfo = skb_shinfo(skb);
++      memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
++      atomic_set(&shinfo->dataref, 1);
++
++      memset(skb, 0, offsetof(struct sk_buff, tail));
++      skb->data = skb->head + NET_SKB_PAD;
++      skb->head_frag = head_frag;
++      skb_reset_tail_pointer(skb);
++}
++EXPORT_SYMBOL(skb_recycle);
++
+ /* Make sure a field is enclosed inside headers_start/headers_end section */
+ #define CHECK_SKB_FIELD(field) \
+       BUILD_BUG_ON(offsetof(struct sk_buff, field) <          \