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authorJonas Gorski <jogo@openwrt.org>2015-06-22 12:27:59 +0000
committerJonas Gorski <jogo@openwrt.org>2015-06-22 12:27:59 +0000
commitdc18617098592901d24daa1fce6734e9c62cbef1 (patch)
treece824259896e9866aa6d76e388ce9272a7ba24a1 /target/linux/generic/patches-4.1/656-skb_reduce_truesize-helper.patch
parent148eac2b3134cc8e1eeaeea95c385a130b953335 (diff)
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generic: add linux 4.1 support
Boot tested: http://pastebin.com/L6aAb9xj Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> [jogo: update to 4.1 final add patches added since submission delete patches applied in later rcs restore commit messages in 220-gc-sections and 304-mips_disable_fpu fix 050-backport_netfilter_rtcache to match new API update inlined dma ops with upstream changes add missing config symbols enabled CONFIG_MULTIUSER update kmod defintions for 4.1 ] Signed-off-by: Jonas Gorski <jogo@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46112 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic/patches-4.1/656-skb_reduce_truesize-helper.patch')
-rw-r--r--target/linux/generic/patches-4.1/656-skb_reduce_truesize-helper.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.1/656-skb_reduce_truesize-helper.patch b/target/linux/generic/patches-4.1/656-skb_reduce_truesize-helper.patch
new file mode 100644
index 0000000000..3a59c3966d
--- /dev/null
+++ b/target/linux/generic/patches-4.1/656-skb_reduce_truesize-helper.patch
@@ -0,0 +1,41 @@
+From 4593a806e31119c5bd3faa00c7210ad862d515af Mon Sep 17 00:00:00 2001
+From: Dave Taht <dave.taht@bufferbloat.net>
+Date: Mon, 31 Dec 2012 10:02:21 -0800
+Subject: [PATCH 3/7] skb_reduce_truesize: helper function for shrinking skbs
+ whenever needed
+
+On embedded devices in particular, large queues of small packets from the rx
+path with a large truesize can exist. Reducing their size can reduce
+memory pressure. skb_reduce_truesize is a helper function for doing this,
+when needed.
+---
+ include/linux/skbuff.h | 18 ++++++++++++++++++
+ 1 file changed, 18 insertions(+)
+
+--- a/include/linux/skbuff.h
++++ b/include/linux/skbuff.h
+@@ -2076,6 +2076,24 @@ static inline void pskb_trim_unique(stru
+ BUG_ON(err);
+ }
+
++/*
++ * Caller wants to reduce memory needs before queueing skb
++ * The (expensive) copy should not be be done in fast path.
++ */
++static inline struct sk_buff *skb_reduce_truesize(struct sk_buff *skb)
++{
++ if (skb->truesize > 2 * SKB_TRUESIZE(skb->len)) {
++ struct sk_buff *nskb;
++ nskb = skb_copy_expand(skb, skb_headroom(skb), 0,
++ GFP_ATOMIC | __GFP_NOWARN);
++ if (nskb) {
++ __kfree_skb(skb);
++ skb = nskb;
++ }
++ }
++ return skb;
++}
++
+ /**
+ * skb_orphan - orphan a buffer
+ * @skb: buffer to orphan