Merge branch 'skbuff-micro-optimize-flow-dissection'

Alexander Lobakin says:

====================
skbuff: micro-optimize flow dissection

This little number makes all of the flow dissection functions take
raw input data pointer as const (1-5) and shuffles the branches in
__skb_header_pointer() according to their hit probability.

The result is +20 Mbps per flow/core with one Flow Dissector pass
per packet. This affects RPS (with software hashing), drivers that
use eth_get_headlen() on their Rx path and so on.

From v2 [1]:
 - reword some commit messages as a potential fix for NIPA;
 - no functional changes.

From v1 [0]:
 - rebase on top of the latest net-next. This was super-weird, but
   I double-checked that the series applies with no conflicts, and
   then on Patchwork it didn't;
 - no other changes.

[0] https://lore.kernel.org/netdev/20210312194538.337504-1-alobakin@pm.me
[1] https://lore.kernel.org/netdev/20210313113645.5949-1-alobakin@pm.me
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 17 insertions, 19 deletions

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 2e5debc0373c..330345b1be54 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -11,7 +11,7 @@
  * Authors:	Ross Biro
  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  *
- *		Relocated to include/linux where it belongs by Alan Cox 
+ *		Relocated to include/linux where it belongs by Alan Cox
  *							<gw4pts@gw4pts.ampr.org>
  */
 #ifndef _LINUX_ETHERDEVICE_H
@@ -29,7 +29,7 @@ struct device;
 int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
 unsigned char *arch_get_platform_mac_address(void);
 int nvmem_get_mac_address(struct device *dev, void *addrbuf);
-u32 eth_get_headlen(const struct net_device *dev, void *data, unsigned int len);
+u32 eth_get_headlen(const struct net_device *dev, const void *data, u32 len);
 __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
 extern const struct header_ops eth_header_ops;
 
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 483e89348f78..ecc029674ae4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1292,10 +1292,10 @@ __skb_set_sw_hash(struct sk_buff *skb, __u32 hash, bool is_l4)
 void __skb_get_hash(struct sk_buff *skb);
 u32 __skb_get_hash_symmetric(const struct sk_buff *skb);
 u32 skb_get_poff(const struct sk_buff *skb);
-u32 __skb_get_poff(const struct sk_buff *skb, void *data,
+u32 __skb_get_poff(const struct sk_buff *skb, const void *data,
 		   const struct flow_keys_basic *keys, int hlen);
 __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
-			    void *data, int hlen_proto);
+			    const void *data, int hlen_proto);
 
 static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
 					int thoff, u8 ip_proto)
@@ -1314,9 +1314,8 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
 bool __skb_flow_dissect(const struct net *net,
 			const struct sk_buff *skb,
 			struct flow_dissector *flow_dissector,
-			void *target_container,
-			void *data, __be16 proto, int nhoff, int hlen,
-			unsigned int flags);
+			void *target_container, const void *data,
+			__be16 proto, int nhoff, int hlen, unsigned int flags);
 
 static inline bool skb_flow_dissect(const struct sk_buff *skb,
 				    struct flow_dissector *flow_dissector,
@@ -1338,9 +1337,9 @@ static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb,
 static inline bool
 skb_flow_dissect_flow_keys_basic(const struct net *net,
 				 const struct sk_buff *skb,
-				 struct flow_keys_basic *flow, void *data,
-				 __be16 proto, int nhoff, int hlen,
-				 unsigned int flags)
+				 struct flow_keys_basic *flow,
+				 const void *data, __be16 proto,
+				 int nhoff, int hlen, unsigned int flags)
 {
 	memset(flow, 0, sizeof(*flow));
 	return __skb_flow_dissect(net, skb, &flow_keys_basic_dissector, flow,
@@ -3678,14 +3677,13 @@ __wsum skb_checksum(const struct sk_buff *skb, int offset, int len,
 		    __wsum csum);
 
 static inline void * __must_check
-__skb_header_pointer(const struct sk_buff *skb, int offset,
-		     int len, void *data, int hlen, void *buffer)
+__skb_header_pointer(const struct sk_buff *skb, int offset, int len,
+		     const void *data, int hlen, void *buffer)
 {
-	if (hlen - offset >= len)
-		return data + offset;
+	if (likely(hlen - offset >= len))
+		return (void *)data + offset;
 
-	if (!skb ||
-	    skb_copy_bits(skb, offset, buffer, len) < 0)
+	if (!skb || unlikely(skb_copy_bits(skb, offset, buffer, len) < 0))
 		return NULL;
 
 	return buffer;
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index cc10b10dc3a1..ffd386ea0dbb 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -350,7 +350,7 @@ static inline bool flow_keys_have_l4(const struct flow_keys *keys)
 u32 flow_hash_from_keys(struct flow_keys *keys);
 void skb_flow_get_icmp_tci(const struct sk_buff *skb,
 			   struct flow_dissector_key_icmp *key_icmp,
-			   void *data, int thoff, int hlen);
+			   const void *data, int thoff, int hlen);
 
 static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,
 				      enum flow_dissector_key_id key_id)
@@ -368,8 +368,8 @@ static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissec
 struct bpf_flow_dissector {
 	struct bpf_flow_keys	*flow_keys;
 	const struct sk_buff	*skb;
-	void			*data;
-	void			*data_end;
+	const void		*data;
+	const void		*data_end;
 };
 
 static inline void