inet: rename some inet_sock fields

In order to have better cache layouts of struct sock (separate zones
for rx/tx paths), we need this preliminary patch.

Goal is to transfert fields used at lookup time in the first
read-mostly cache line (inside struct sock_common) and move sk_refcnt
to a separate cache line (only written by rx path)

This patch adds inet_ prefix to daddr, rcv_saddr, dport, num, saddr,
sport and id fields. This allows a future patch to define these
fields as macros, like sk_refcnt, without name clashes.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/ipv6.h

@@ -505,7 +505,7 @@ static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 
 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)	&& \
-	 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))  	&& \
+	 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
 	 ((__sk)->sk_family		== AF_INET6)		&& \
 	 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))	&& \
 	 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr))	&& \

include/net/inet6_hashtables.h

@@ -46,8 +46,8 @@ static inline int inet6_sk_ehashfn(const struct sock *sk)
 	const struct ipv6_pinfo *np = inet6_sk(sk);
 	const struct in6_addr *laddr = &np->rcv_saddr;
 	const struct in6_addr *faddr = &np->daddr;
-	const __u16 lport = inet->num;
-	const __be16 fport = inet->dport;
+	const __u16 lport = inet->inet_num;
+	const __be16 fport = inet->inet_dport;
 	struct net *net = sock_net(sk);
 
 	return inet6_ehashfn(net, laddr, lport, faddr, fport);

include/net/inet_hashtables.h

@@ -241,7 +241,7 @@ static inline int inet_lhashfn(struct net *net, const unsigned short num)
 
 static inline int inet_sk_listen_hashfn(const struct sock *sk)
 {
-	return inet_lhashfn(sock_net(sk), inet_sk(sk)->num);
+	return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
 }
 
 /* Caller must disable local BH processing. */
@@ -301,8 +301,8 @@ typedef __u64 __bitwise __addrpair;
 #endif /* __BIG_ENDIAN */
 #define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) &&	\
-	 ((*((__addrpair *)&(inet_sk(__sk)->daddr))) == (__cookie))	&&	\
-	 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))	&&	\
+	 ((*((__addrpair *)&(inet_sk(__sk)->inet_daddr))) == (__cookie))  &&	\
+	 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports))   &&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) &&	\
@@ -313,9 +313,9 @@ typedef __u64 __bitwise __addrpair;
 #define INET_ADDR_COOKIE(__name, __saddr, __daddr)
 #define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)	\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net))	&&	\
-	 (inet_sk(__sk)->daddr		== (__saddr))		&&	\
-	 (inet_sk(__sk)->rcv_saddr	== (__daddr))		&&	\
-	 ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))	&&	\
+	 (inet_sk(__sk)->inet_daddr	== (__saddr))		&&	\
+	 (inet_sk(__sk)->inet_rcv_saddr	== (__daddr))		&&	\
+	 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports))	&&	\
 	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 #define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif)	\
 	(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net))	&&	\

include/net/inet_sock.h

@@ -93,14 +93,14 @@ struct rtable;
  *
  * @sk - ancestor class
  * @pinet6 - pointer to IPv6 control block
- * @daddr - Foreign IPv4 addr
- * @rcv_saddr - Bound local IPv4 addr
- * @dport - Destination port
- * @num - Local port
- * @saddr - Sending source
+ * @inet_daddr - Foreign IPv4 addr
+ * @inet_rcv_saddr - Bound local IPv4 addr
+ * @inet_dport - Destination port
+ * @inet_num - Local port
+ * @inet_saddr - Sending source
  * @uc_ttl - Unicast TTL
- * @sport - Source port
- * @id - ID counter for DF pkts
+ * @inet_sport - Source port
+ * @inet_id - ID counter for DF pkts
  * @tos - TOS
  * @mc_ttl - Multicasting TTL
  * @is_icsk - is this an inet_connection_sock?
@@ -115,16 +115,16 @@ struct inet_sock {
 	struct ipv6_pinfo	*pinet6;
 #endif
 	/* Socket demultiplex comparisons on incoming packets. */
-	__be32			daddr;
-	__be32			rcv_saddr;
-	__be16			dport;
-	__u16			num;
-	__be32			saddr;
+	__be32			inet_daddr;
+	__be32			inet_rcv_saddr;
+	__be16			inet_dport;
+	__u16			inet_num;
+	__be32			inet_saddr;
 	__s16			uc_ttl;
 	__u16			cmsg_flags;
 	struct ip_options	*opt;
-	__be16			sport;
-	__u16			id;
+	__be16			inet_sport;
+	__u16			inet_id;
 	__u8			tos;
 	__u8			mc_ttl;
 	__u8			pmtudisc;
@@ -190,10 +190,10 @@ static inline unsigned int inet_ehashfn(struct net *net,
 static inline int inet_sk_ehashfn(const struct sock *sk)
 {
 	const struct inet_sock *inet = inet_sk(sk);
-	const __be32 laddr = inet->rcv_saddr;
-	const __u16 lport = inet->num;
-	const __be32 faddr = inet->daddr;
-	const __be16 fport = inet->dport;
+	const __be32 laddr = inet->inet_rcv_saddr;
+	const __u16 lport = inet->inet_num;
+	const __be32 faddr = inet->inet_daddr;
+	const __be16 fport = inet->inet_dport;
 	struct net *net = sock_net(sk);
 
 	return inet_ehashfn(net, laddr, lport, faddr, fport);

include/net/inet_timewait_sock.h

@@ -194,7 +194,7 @@ static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
 static inline __be32 inet_rcv_saddr(const struct sock *sk)
 {
 	return likely(sk->sk_state != TCP_TIME_WAIT) ?
-		inet_sk(sk)->rcv_saddr : inet_twsk(sk)->tw_rcv_saddr;
+		inet_sk(sk)->inet_rcv_saddr : inet_twsk(sk)->tw_rcv_saddr;
 }
 
 extern void inet_twsk_put(struct inet_timewait_sock *tw);

include/net/ip.h

@@ -240,8 +240,8 @@ static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, str
 		 * does not change, they drop every other packet in
 		 * a TCP stream using header compression.
 		 */
-		iph->id = (sk && inet_sk(sk)->daddr) ?
-					htons(inet_sk(sk)->id++) : 0;
+		iph->id = (sk && inet_sk(sk)->inet_daddr) ?
+					htons(inet_sk(sk)->inet_id++) : 0;
 	} else
 		__ip_select_ident(iph, dst, 0);
 }
@@ -249,9 +249,9 @@ static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, str
 static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
 {
 	if (iph->frag_off & htons(IP_DF)) {
-		if (sk && inet_sk(sk)->daddr) {
-			iph->id = htons(inet_sk(sk)->id);
-			inet_sk(sk)->id += 1 + more;
+		if (sk && inet_sk(sk)->inet_daddr) {
+			iph->id = htons(inet_sk(sk)->inet_id);
+			inet_sk(sk)->inet_id += 1 + more;
 		} else
 			iph->id = 0;
 	} else
@@ -317,7 +317,7 @@ static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, ch
 
 static __inline__ void inet_reset_saddr(struct sock *sk)
 {
-	inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
+	inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 	if (sk->sk_family == PF_INET6) {
 		struct ipv6_pinfo *np = inet6_sk(sk);