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Subject[PATCH] (7/8) Eliminate brlock from IPV6
From
Date
Replace brlock in IPV6 with RCU.

diff -urN -X dontdiff linux-2.5.64/net/ipv6/af_inet6.c linux-2.5-nobrlock/net/ipv6/af_inet6.c
--- linux-2.5.64/net/ipv6/af_inet6.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/ipv6/af_inet6.c 2003-03-10 16:05:21.000000000 -0800
@@ -45,7 +45,6 @@
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
-#include <linux/brlock.h>
#include <linux/smp_lock.h>

#include <net/ip.h>
@@ -101,6 +100,7 @@
* build a new socket.
*/
struct list_head inetsw6[SOCK_MAX];
+static spinlock_t inetsw6_lock = SPIN_LOCK_UNLOCKED;

static void inet6_sock_destruct(struct sock *sk)
{
@@ -161,8 +161,8 @@

/* Look for the requested type/protocol pair. */
answer = NULL;
- br_read_lock_bh(BR_NETPROTO_LOCK);
- list_for_each(p, &inetsw6[sock->type]) {
+ rcu_read_lock();
+ list_for_each_rcu(p, &inetsw6[sock->type]) {
answer = list_entry(p, struct inet_protosw, list);

/* Check the non-wild match. */
@@ -180,7 +180,7 @@
}
answer = NULL;
}
- br_read_unlock_bh(BR_NETPROTO_LOCK);
+ rcu_read_unlock();

if (!answer)
goto free_and_badtype;
@@ -571,8 +571,7 @@
int protocol = p->protocol;
struct list_head *last_perm;

- br_write_lock_bh(BR_NETPROTO_LOCK);
-
+ spin_lock_bh(&inetsw6_lock);
if (p->type > SOCK_MAX)
goto out_illegal;

@@ -602,7 +601,7 @@
*/
list_add(&p->list, last_perm);
out:
- br_write_unlock_bh(BR_NETPROTO_LOCK);
+ spin_unlock_bh(&inetsw6_lock);
return;

out_permanent:
diff -urN -X dontdiff linux-2.5.64/net/ipv6/ipv6_sockglue.c linux-2.5-nobrlock/net/ipv6/ipv6_sockglue.c
--- linux-2.5.64/net/ipv6/ipv6_sockglue.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/ipv6/ipv6_sockglue.c 2003-03-10 13:33:07.000000000 -0800
@@ -54,11 +54,10 @@

static struct packet_type ipv6_packet_type =
{
- __constant_htons(ETH_P_IPV6),
- NULL, /* All devices */
- ipv6_rcv,
- (void*)1,
- NULL
+ .type = __constant_htons(ETH_P_IPV6),
+ .dev = NULL, /* All devices */
+ .func = ipv6_rcv,
+ .data = (void*)1,
};

/*
diff -urN -X dontdiff linux-2.5.64/net/ipv6/netfilter/ip6_queue.c linux-2.5-nobrlock/net/ipv6/netfilter/ip6_queue.c
--- linux-2.5.64/net/ipv6/netfilter/ip6_queue.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/ipv6/netfilter/ip6_queue.c 2003-03-11 15:05:18.000000000 -0800
@@ -26,7 +26,6 @@
#include <linux/netfilter.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
-#include <linux/brlock.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
@@ -688,8 +687,6 @@

cleanup:
nf_unregister_queue_handler(PF_INET6);
- br_write_lock_bh(BR_NETPROTO_LOCK);
- br_write_unlock_bh(BR_NETPROTO_LOCK);
ipq_flush(NF_DROP);

cleanup_sysctl:
diff -urN -X dontdiff linux-2.5.64/net/ipv6/protocol.c linux-2.5-nobrlock/net/ipv6/protocol.c
--- linux-2.5.64/net/ipv6/protocol.c 2003-03-11 09:08:01.000000000 -0800
+++ linux-2.5-nobrlock/net/ipv6/protocol.c 2003-03-11 14:37:06.000000000 -0800
@@ -32,7 +32,6 @@
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
-#include <linux/brlock.h>

#include <net/sock.h>
#include <net/snmp.h>
@@ -41,21 +40,21 @@
#include <net/protocol.h>

struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
+static spinlock_t inet6_proto_lock = SPIN_LOCK_UNLOCKED;

int inet6_add_protocol(struct inet6_protocol *prot, unsigned char protocol)
{
int ret, hash = protocol & (MAX_INET_PROTOS - 1);

- br_write_lock_bh(BR_NETPROTO_LOCK);

+ spin_lock_bh(&inet6_proto_lock);
if (inet6_protos[hash]) {
ret = -1;
} else {
inet6_protos[hash] = prot;
ret = 0;
}
-
- br_write_unlock_bh(BR_NETPROTO_LOCK);
+ spin_unlock_bh(&inet6_proto_lock);

return ret;
}
@@ -68,7 +67,7 @@
{
int ret, hash = protocol & (MAX_INET_PROTOS - 1);

- br_write_lock_bh(BR_NETPROTO_LOCK);
+ spin_lock_bh(&inet6_proto_lock);

if (inet6_protos[hash] != prot) {
ret = -1;
@@ -76,8 +75,9 @@
inet6_protos[hash] = NULL;
ret = 0;
}
+ spin_unlock_bh(&inet6_proto_lock);

- br_write_unlock_bh(BR_NETPROTO_LOCK);
+ synchronize_kernel();

return ret;
}


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