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Commit b7e729c4 authored by Denis V. Lunev's avatar Denis V. Lunev Committed by David S. Miller
Browse files

[ICMP]: Store sock rather than socket for ICMP flow control. 



Basically, there is no difference, what to store: socket or sock. Though,
sock looks better as there will be 1 less dereferrence on the fast path.

Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
Acked-by: default avatarDaniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1e3cf683

net/ipv4/icmp.c

+13 −14
Original line number Diff line number Diff line
@@ -229,14 +229,14 @@ static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1]; 
 *

 *	On SMP we have one ICMP socket per-cpu.

 */

static DEFINE_PER_CPU(struct socket *, __icmp_socket) = NULL;

#define icmp_socket	__get_cpu_var(__icmp_socket)

static DEFINE_PER_CPU(struct sock *, __icmp_sk) = NULL;

#define icmp_sk		__get_cpu_var(__icmp_sk)



static inline int icmp_xmit_lock(void)

{

	local_bh_disable();



	if (unlikely(!spin_trylock(&icmp_socket->sk->sk_lock.slock))) {

	if (unlikely(!spin_trylock(&icmp_sk->sk_lock.slock))) {

		/* This can happen if the output path signals a

		 * dst_link_failure() for an outgoing ICMP packet.

		 */
@@ -248,7 +248,7 @@ static inline int icmp_xmit_lock(void) 


static inline void icmp_xmit_unlock(void)

{

	spin_unlock_bh(&icmp_socket->sk->sk_lock.slock);

	spin_unlock_bh(&icmp_sk->sk_lock.slock);

}



/*
@@ -349,7 +349,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param, 
	struct sock *sk;

	struct sk_buff *skb;



	sk = icmp_socket->sk;

	sk = icmp_sk;

	if (ip_append_data(sk, icmp_glue_bits, icmp_param,

			   icmp_param->data_len+icmp_param->head_len,

			   icmp_param->head_len,
@@ -378,7 +378,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param, 


static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb)

{

	struct sock *sk = icmp_socket->sk;

	struct sock *sk = icmp_sk;

	struct inet_sock *inet = inet_sk(sk);

	struct ipcm_cookie ipc;

	struct rtable *rt = (struct rtable *)skb->dst;
@@ -546,7 +546,7 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) 
	icmp_param.data.icmph.checksum	 = 0;

	icmp_param.skb	  = skb_in;

	icmp_param.offset = skb_network_offset(skb_in);

	inet_sk(icmp_socket->sk)->tos = tos;

	inet_sk(icmp_sk)->tos = tos;

	ipc.addr = iph->saddr;

	ipc.opt = &icmp_param.replyopts;
@@ -1146,13 +1146,13 @@ static void __exit icmp_exit(void) 
	int i;



	for_each_possible_cpu(i) {

		struct socket *sock;

		struct sock *sk;



		sock = per_cpu(__icmp_socket, i);

		if (sock == NULL)

		sk = per_cpu(__icmp_sk, i);

		if (sk == NULL)

			continue;

		per_cpu(__icmp_socket, i) = NULL;

		sock_release(sock);

		per_cpu(__icmp_sk, i) = NULL;

		sock_release(sk->sk_socket);

	}

}
@@ -1169,8 +1169,7 @@ int __init icmp_init(void) 
		if (err < 0)

			goto fail;



		per_cpu(__icmp_socket, i) = sock;

		sk = sock->sk;

		per_cpu(__icmp_sk, i) = sk = sock->sk;

		sk->sk_allocation = GFP_ATOMIC;



		/* Enough space for 2 64K ICMP packets, including

net/ipv6/icmp.c

+13 −12
Original line number Diff line number Diff line
@@ -80,8 +80,8 @@ EXPORT_SYMBOL(icmpv6msg_statistics); 
 *

 *	On SMP we have one ICMP socket per-cpu.

 */

static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL;

#define icmpv6_socket	__get_cpu_var(__icmpv6_socket)

static DEFINE_PER_CPU(struct sock *, __icmpv6_sk) = NULL;

#define icmpv6_sk	__get_cpu_var(__icmpv6_sk)



static int icmpv6_rcv(struct sk_buff *skb);
@@ -94,7 +94,7 @@ static __inline__ int icmpv6_xmit_lock(void) 
{

	local_bh_disable();



	if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) {

	if (unlikely(!spin_trylock(&icmpv6_sk->sk_lock.slock))) {

		/* This can happen if the output path (f.e. SIT or

		 * ip6ip6 tunnel) signals dst_link_failure() for an

		 * outgoing ICMP6 packet.
@@ -107,7 +107,7 @@ static __inline__ int icmpv6_xmit_lock(void) 


static __inline__ void icmpv6_xmit_unlock(void)

{

	spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock);

	spin_unlock_bh(&icmpv6_sk->sk_lock.slock);

}



/*
@@ -392,7 +392,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 
	if (icmpv6_xmit_lock())

		return;



	sk = icmpv6_socket->sk;

	sk = icmpv6_sk;

	np = inet6_sk(sk);



	if (!icmpv6_xrlim_allow(sk, type, &fl))
@@ -538,7 +538,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb) 
	if (icmpv6_xmit_lock())

		return;



	sk = icmpv6_socket->sk;

	sk = icmpv6_sk;

	np = inet6_sk(sk);



	if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
@@ -776,7 +776,7 @@ static int icmpv6_rcv(struct sk_buff *skb) 
}



/*

 * Special lock-class for __icmpv6_socket:

 * Special lock-class for __icmpv6_sk:

 */

static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
@@ -786,8 +786,9 @@ int __init icmpv6_init(void) 
	int err, i, j;



	for_each_possible_cpu(i) {

		struct socket *sock;

		err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6,

				       &per_cpu(__icmpv6_socket, i));

				       &sock);

		if (err < 0) {

			printk(KERN_ERR

			       "Failed to initialize the ICMP6 control socket "
@@ -796,12 +797,12 @@ int __init icmpv6_init(void) 
			goto fail;

		}



		sk = per_cpu(__icmpv6_socket, i)->sk;

		per_cpu(__icmpv6_sk, i) = sk = sock->sk;

		sk->sk_allocation = GFP_ATOMIC;

		/*

		 * Split off their lock-class, because sk->sk_dst_lock

		 * gets used from softirqs, which is safe for

		 * __icmpv6_socket (because those never get directly used

		 * __icmpv6_sk (because those never get directly used

		 * via userspace syscalls), but unsafe for normal sockets.

		 */

		lockdep_set_class(&sk->sk_dst_lock,
@@ -829,7 +830,7 @@ int __init icmpv6_init(void) 
	for (j = 0; j < i; j++) {

		if (!cpu_possible(j))

			continue;

		sock_release(per_cpu(__icmpv6_socket, j));

		sock_release(per_cpu(__icmpv6_sk, j)->sk_socket);

	}



	return err;
@@ -840,7 +841,7 @@ void icmpv6_cleanup(void) 
	int i;



	for_each_possible_cpu(i) {

		sock_release(per_cpu(__icmpv6_socket, i));

		sock_release(per_cpu(__icmpv6_sk, i)->sk_socket);

	}

	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);

}