improve the skb padding performance change to avoid unnecessary reallocations in...

SVN-Revision: 15761

diff --git a/target/linux/generic-2.6/patches-2.6.28/205-skb_padding.patch b/target/linux/generic-2.6/patches-2.6.28/205-skb_padding.patch
index 07e730a20668a6c6fa6397d943ddb552ee3a9a8e..855f0fedd54f0d6b4eb435af79756966b89a146f 100644 (file)
--- a/target/linux/generic-2.6/patches-2.6.28/205-skb_padding.patch
+++ b/target/linux/generic-2.6/patches-2.6.28/205-skb_padding.patch
@@ -1,16 +1,56 @@
 --- a/include/linux/skbuff.h
 +++ b/include/linux/skbuff.h
-@@ -1270,9 +1270,12 @@
+@@ -1256,11 +1256,18 @@ static inline int skb_network_offset(con
   *
   * Various parts of the networking layer expect at least 16 bytes of
   * headroom, you should not reduce this.
 + *
 + * This has been changed to 64 to acommodate for routing between ethernet
-+ * and wireless
++ * and wireless, but only for new allocations
   */
  #ifndef NET_SKB_PAD
--#define NET_SKB_PAD   16
-+#define NET_SKB_PAD   64
+ #define NET_SKB_PAD   16
  #endif
  
++#ifndef NET_SKB_PAD_ALLOC
++#define NET_SKB_PAD_ALLOC     64
++#endif
++
  extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
+ 
+ static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
+@@ -1350,9 +1357,9 @@ static inline void __skb_queue_purge(str
+ static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
+                                             gfp_t gfp_mask)
+ {
+-      struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
++      struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask);
+       if (likely(skb))
+-              skb_reserve(skb, NET_SKB_PAD);
++              skb_reserve(skb, NET_SKB_PAD_ALLOC);
+       return skb;
+ }
+ 
+@@ -1425,7 +1432,7 @@ static inline int __skb_cow(struct sk_bu
+               delta = headroom - skb_headroom(skb);
+ 
+       if (delta || cloned)
+-              return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
++              return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD_ALLOC), 0,
+                                       GFP_ATOMIC);
+       return 0;
+ }
+--- a/net/core/skbuff.c
++++ b/net/core/skbuff.c
+@@ -243,9 +243,9 @@ struct sk_buff *__netdev_alloc_skb(struc
+       int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
+       struct sk_buff *skb;
+ 
+-      skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node);
++      skb = __alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask, 0, node);
+       if (likely(skb)) {
+-              skb_reserve(skb, NET_SKB_PAD);
++              skb_reserve(skb, NET_SKB_PAD_ALLOC);
+               skb->dev = dev;
+       }
+       return skb;

diff --git a/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch b/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch
index c11bffe550c35938f49f96909ea8b7042795e199..ff05b8d930dbe71d9f250da14a9599e7f4a22470 100644 (file)
--- a/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch
+++ b/target/linux/generic-2.6/patches-2.6.29/205-skb_padding.patch
@@ -1,16 +1,56 @@
 --- a/include/linux/skbuff.h
 +++ b/include/linux/skbuff.h
-@@ -1306,9 +1306,12 @@
+@@ -1306,11 +1306,18 @@ static inline int skb_network_offset(con
   *
   * Various parts of the networking layer expect at least 16 bytes of
   * headroom, you should not reduce this.
 + *
 + * This has been changed to 64 to acommodate for routing between ethernet
-+ * and wireless
++ * and wireless, but only for new allocations
   */
  #ifndef NET_SKB_PAD
--#define NET_SKB_PAD   16
-+#define NET_SKB_PAD   64
+ #define NET_SKB_PAD   16
  #endif
  
++#ifndef NET_SKB_PAD_ALLOC
++#define NET_SKB_PAD_ALLOC     64
++#endif
++
  extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
+ 
+ static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
+@@ -1400,9 +1407,9 @@ static inline void __skb_queue_purge(str
+ static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
+                                             gfp_t gfp_mask)
+ {
+-      struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
++      struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask);
+       if (likely(skb))
+-              skb_reserve(skb, NET_SKB_PAD);
++              skb_reserve(skb, NET_SKB_PAD_ALLOC);
+       return skb;
+ }
+ 
+@@ -1475,7 +1482,7 @@ static inline int __skb_cow(struct sk_bu
+               delta = headroom - skb_headroom(skb);
+ 
+       if (delta || cloned)
+-              return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
++              return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD_ALLOC), 0,
+                                       GFP_ATOMIC);
+       return 0;
+ }
+--- a/net/core/skbuff.c
++++ b/net/core/skbuff.c
+@@ -320,9 +320,9 @@ struct sk_buff *__netdev_alloc_skb(struc
+       int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
+       struct sk_buff *skb;
+ 
+-      skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node);
++      skb = __alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask, 0, node);
+       if (likely(skb)) {
+-              skb_reserve(skb, NET_SKB_PAD);
++              skb_reserve(skb, NET_SKB_PAD_ALLOC);
+               skb->dev = dev;
+       }
+       return skb;

diff --git a/target/linux/generic-2.6/patches-2.6.30/205-skb_padding.patch b/target/linux/generic-2.6/patches-2.6.30/205-skb_padding.patch
index 549fa50c9a64ff1aefde7581452f3d969d19b6ac..06b494b91be273ddf7d7a140690674b8fe76656d 100644 (file)
--- a/target/linux/generic-2.6/patches-2.6.30/205-skb_padding.patch
+++ b/target/linux/generic-2.6/patches-2.6.30/205-skb_padding.patch
@@ -1,16 +1,56 @@
 --- a/include/linux/skbuff.h
 +++ b/include/linux/skbuff.h
-@@ -1369,9 +1369,12 @@ static inline int skb_network_offset(con
+@@ -1369,11 +1369,18 @@ static inline int skb_network_offset(con
   *
   * Various parts of the networking layer expect at least 32 bytes of
   * headroom, you should not reduce this.
 + *
 + * This has been changed to 64 to acommodate for routing between ethernet
-+ * and wireless
++ * and wireless, but only for new allocations
   */
  #ifndef NET_SKB_PAD
--#define NET_SKB_PAD   32
-+#define NET_SKB_PAD   64
+ #define NET_SKB_PAD   32
  #endif
  
++#ifndef NET_SKB_PAD_ALLOC
++#define NET_SKB_PAD_ALLOC     64
++#endif
++
  extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
+ 
+ static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
+@@ -1463,9 +1470,9 @@ static inline void __skb_queue_purge(str
+ static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
+                                             gfp_t gfp_mask)
+ {
+-      struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
++      struct sk_buff *skb = alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask);
+       if (likely(skb))
+-              skb_reserve(skb, NET_SKB_PAD);
++              skb_reserve(skb, NET_SKB_PAD_ALLOC);
+       return skb;
+ }
+ 
+@@ -1538,7 +1545,7 @@ static inline int __skb_cow(struct sk_bu
+               delta = headroom - skb_headroom(skb);
+ 
+       if (delta || cloned)
+-              return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
++              return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD_ALLOC), 0,
+                                       GFP_ATOMIC);
+       return 0;
+ }
+--- a/net/core/skbuff.c
++++ b/net/core/skbuff.c
+@@ -327,9 +327,9 @@ struct sk_buff *__netdev_alloc_skb(struc
+       int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
+       struct sk_buff *skb;
+ 
+-      skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node);
++      skb = __alloc_skb(length + NET_SKB_PAD_ALLOC, gfp_mask, 0, node);
+       if (likely(skb)) {
+-              skb_reserve(skb, NET_SKB_PAD);
++              skb_reserve(skb, NET_SKB_PAD_ALLOC);
+               skb->dev = dev;
+       }
+       return skb;