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Date: Fri, 26 Apr 2019 18:56:54 -0700
From: David Ahern <dsahern@...nel.org>
To: davem@...emloft.net, netdev@...r.kernel.org
Cc: idosch@...lanox.com, David Ahern <dsahern@...il.com>
Subject: [PATCH net-next 4/7] ipv6: Move pcpu cached routes to fib6_nh
From: David Ahern <dsahern@...il.com>
rt6_info are specific instances of a fib entry and are tied to a
device and gateway - ie., a nexthop. Before nexthop objects, IPv6 fib
entries have separate fib6_info for each nexthop in a multipath route,
so the location of the pcpu cache in the fib6_info struct worked.
However, with nexthop objects a fib6_info can point to a set of nexthops
(yet another alignment of ipv6 with ipv4). Accordingly, the pcpu
cache needs to be moved to the fib6_nh struct so the cached entries
are local to the nexthop specification used to create the rt6_info.
Initialization and free of the pcpu entries moved to fib6_nh_init and
fib6_nh_release.
Change in location only, from fib6_info down to fib6_nh; no other
functional change intended.
Signed-off-by: David Ahern <dsahern@...il.com>
---
include/net/ip6_fib.h | 3 ++-
net/ipv6/addrconf.c | 6 +++---
net/ipv6/ip6_fib.c | 33 ++++++---------------------------
net/ipv6/route.c | 29 +++++++++++++++++++++++++++--
4 files changed, 38 insertions(+), 33 deletions(-)
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 40105738e2f6..cf715835a330 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -131,6 +131,8 @@ struct fib6_nh {
#ifdef CONFIG_IPV6_ROUTER_PREF
unsigned long last_probe;
#endif
+
+ struct rt6_info * __percpu *rt6i_pcpu;
};
struct fib6_info {
@@ -156,7 +158,6 @@ struct fib6_info {
struct rt6key fib6_src;
struct rt6key fib6_prefsrc;
- struct rt6_info * __percpu *rt6i_pcpu;
struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
u32 fib6_metric;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 340a0f06f974..25754175097b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -6339,16 +6339,16 @@ void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
list_for_each_entry(ifa, &idev->addr_list, if_list) {
spin_lock(&ifa->lock);
if (ifa->rt) {
- struct fib6_info *rt = ifa->rt;
+ struct fib6_nh *nh = &ifa->rt->fib6_nh;
int cpu;
rcu_read_lock();
ifa->rt->dst_nopolicy = val ? true : false;
- if (rt->rt6i_pcpu) {
+ if (nh->rt6i_pcpu) {
for_each_possible_cpu(cpu) {
struct rt6_info **rtp;
- rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
+ rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
addrconf_set_nopolicy(*rtp, val);
}
}
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index a8919c217cc2..793830b2965d 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -155,12 +155,6 @@ struct fib6_info *fib6_info_alloc(gfp_t gfp_flags)
if (!f6i)
return NULL;
- f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
- if (!f6i->rt6i_pcpu) {
- kfree(f6i);
- return NULL;
- }
-
INIT_LIST_HEAD(&f6i->fib6_siblings);
refcount_set(&f6i->fib6_ref, 1);
@@ -177,25 +171,6 @@ void fib6_info_destroy_rcu(struct rcu_head *head)
bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
kfree(bucket);
- if (f6i->rt6i_pcpu) {
- int cpu;
-
- for_each_possible_cpu(cpu) {
- struct rt6_info **ppcpu_rt;
- struct rt6_info *pcpu_rt;
-
- ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
- pcpu_rt = *ppcpu_rt;
- if (pcpu_rt) {
- dst_dev_put(&pcpu_rt->dst);
- dst_release(&pcpu_rt->dst);
- *ppcpu_rt = NULL;
- }
- }
-
- free_percpu(f6i->rt6i_pcpu);
- }
-
fib6_nh_release(&f6i->fib6_nh);
ip_fib_metrics_put(f6i->fib6_metrics);
@@ -902,8 +877,12 @@ static struct fib6_node *fib6_add_1(struct net *net,
static void fib6_drop_pcpu_from(struct fib6_info *f6i,
const struct fib6_table *table)
{
+ struct fib6_nh *fib6_nh = &f6i->fib6_nh;
int cpu;
+ if (!rcu_access_pointer(fib6_nh->rt6i_pcpu))
+ return;
+
/* release the reference to this fib entry from
* all of its cached pcpu routes
*/
@@ -911,7 +890,7 @@ static void fib6_drop_pcpu_from(struct fib6_info *f6i,
struct rt6_info **ppcpu_rt;
struct rt6_info *pcpu_rt;
- ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
+ ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
pcpu_rt = *ppcpu_rt;
if (pcpu_rt) {
struct fib6_info *from;
@@ -951,7 +930,7 @@ static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn,
lockdep_is_held(&table->tb6_lock));
}
- if (rt->rt6i_pcpu)
+ if (rt->fib6_nh.rt6i_pcpu)
fib6_drop_pcpu_from(rt, table);
}
}
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 9c0127a44f9f..32c526d008e2 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1273,7 +1273,7 @@ static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
{
struct rt6_info *pcpu_rt, **p;
- p = this_cpu_ptr(res->f6i->rt6i_pcpu);
+ p = this_cpu_ptr(res->nh->rt6i_pcpu);
pcpu_rt = *p;
if (pcpu_rt)
@@ -1294,7 +1294,7 @@ static struct rt6_info *rt6_make_pcpu_route(struct net *net,
}
dst_hold(&pcpu_rt->dst);
- p = this_cpu_ptr(res->f6i->rt6i_pcpu);
+ p = this_cpu_ptr(res->nh->rt6i_pcpu);
prev = cmpxchg(p, NULL, pcpu_rt);
BUG_ON(prev);
@@ -3063,6 +3063,12 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
!netif_carrier_ok(dev))
fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
+ fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
+ if (!fib6_nh->rt6i_pcpu) {
+ err = -ENOMEM;
+ goto out;
+ }
+
err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
cfg->fc_encap_type, cfg, gfp_flags, extack);
if (err)
@@ -3087,6 +3093,25 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
void fib6_nh_release(struct fib6_nh *fib6_nh)
{
+ if (fib6_nh->rt6i_pcpu) {
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct rt6_info **ppcpu_rt;
+ struct rt6_info *pcpu_rt;
+
+ ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
+ pcpu_rt = *ppcpu_rt;
+ if (pcpu_rt) {
+ dst_dev_put(&pcpu_rt->dst);
+ dst_release(&pcpu_rt->dst);
+ *ppcpu_rt = NULL;
+ }
+ }
+
+ free_percpu(fib6_nh->rt6i_pcpu);
+ }
+
fib_nh_common_release(&fib6_nh->nh_common);
}
--
2.11.0
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