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Date: Fri, 26 Apr 2019 18:56:53 -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 3/7] ipv4: Move exception bucket to nh_common
From: David Ahern <dsahern@...il.com>
Similar to the cached routes, make IPv4 exceptions accessible when
using an IPv6 nexthop struct with IPv4 routes. Simplify the exception
functions by passing in fib_nh_common since that is all it needs,
and then cleanup the call sites that have extraneous fib_nh conversions.
As with the cached routes this is a change in location only, from fib_nh
up to fib_nh_common; no functional change intended:
Signed-off-by: David Ahern <dsahern@...il.com>
---
include/net/ip_fib.h | 2 +-
net/ipv4/fib_semantics.c | 12 ++++++------
net/ipv4/route.c | 41 +++++++++++++++++------------------------
3 files changed, 24 insertions(+), 31 deletions(-)
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 659c5081c40b..d0e28f4ab099 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -100,6 +100,7 @@ struct fib_nh_common {
/* v4 specific, but allows fib6_nh with v4 routes */
struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
struct rtable __rcu *nhc_rth_input;
+ struct fnhe_hash_bucket __rcu *nhc_exceptions;
};
struct fib_nh {
@@ -111,7 +112,6 @@ struct fib_nh {
#endif
__be32 nh_saddr;
int nh_saddr_genid;
- struct fnhe_hash_bucket __rcu *nh_exceptions;
#define fib_nh_family nh_common.nhc_family
#define fib_nh_dev nh_common.nhc_dev
#define fib_nh_oif nh_common.nhc_oif
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 9ef4529db659..107ac9183eb2 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -159,12 +159,12 @@ static void rt_fibinfo_free(struct rtable __rcu **rtp)
dst_release_immediate(&rt->dst);
}
-static void free_nh_exceptions(struct fib_nh *nh)
+static void free_nh_exceptions(struct fib_nh_common *nhc)
{
struct fnhe_hash_bucket *hash;
int i;
- hash = rcu_dereference_protected(nh->nh_exceptions, 1);
+ hash = rcu_dereference_protected(nhc->nhc_exceptions, 1);
if (!hash)
return;
for (i = 0; i < FNHE_HASH_SIZE; i++) {
@@ -214,6 +214,7 @@ void fib_nh_common_release(struct fib_nh_common *nhc)
lwtstate_put(nhc->nhc_lwtstate);
rt_fibinfo_free_cpus(nhc->nhc_pcpu_rth_output);
rt_fibinfo_free(&nhc->nhc_rth_input);
+ free_nh_exceptions(nhc);
}
EXPORT_SYMBOL_GPL(fib_nh_common_release);
@@ -224,7 +225,6 @@ void fib_nh_release(struct net *net, struct fib_nh *fib_nh)
net->ipv4.fib_num_tclassid_users--;
#endif
fib_nh_common_release(&fib_nh->nh_common);
- free_nh_exceptions(fib_nh);
}
/* Release a nexthop info record */
@@ -1712,12 +1712,12 @@ static int call_fib_nh_notifiers(struct fib_nh *nh,
* - if the new MTU is greater than the PMTU, don't make any change
* - otherwise, unlock and set PMTU
*/
-static void nh_update_mtu(struct fib_nh *nh, u32 new, u32 orig)
+static void nh_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig)
{
struct fnhe_hash_bucket *bucket;
int i;
- bucket = rcu_dereference_protected(nh->nh_exceptions, 1);
+ bucket = rcu_dereference_protected(nhc->nhc_exceptions, 1);
if (!bucket)
return;
@@ -1748,7 +1748,7 @@ void fib_sync_mtu(struct net_device *dev, u32 orig_mtu)
hlist_for_each_entry(nh, head, nh_hash) {
if (nh->fib_nh_dev == dev)
- nh_update_mtu(nh, dev->mtu, orig_mtu);
+ nh_update_mtu(&nh->nh_common, dev->mtu, orig_mtu);
}
}
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index bf76830ac1e5..fb3d4b40eecd 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -643,10 +643,10 @@ static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnh
}
}
-static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
- u32 pmtu, bool lock, unsigned long expires)
+static void update_or_create_fnhe(struct fib_nh_common *nhc, __be32 daddr,
+ __be32 gw, u32 pmtu, bool lock,
+ unsigned long expires)
{
- struct fib_nh_common *nhc = &nh->nh_common;
struct fnhe_hash_bucket *hash;
struct fib_nh_exception *fnhe;
struct rtable *rt;
@@ -654,17 +654,17 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
unsigned int i;
int depth;
- genid = fnhe_genid(dev_net(nh->fib_nh_dev));
+ genid = fnhe_genid(dev_net(nhc->nhc_dev));
hval = fnhe_hashfun(daddr);
spin_lock_bh(&fnhe_lock);
- hash = rcu_dereference(nh->nh_exceptions);
+ hash = rcu_dereference(nhc->nhc_exceptions);
if (!hash) {
hash = kcalloc(FNHE_HASH_SIZE, sizeof(*hash), GFP_ATOMIC);
if (!hash)
goto out_unlock;
- rcu_assign_pointer(nh->nh_exceptions, hash);
+ rcu_assign_pointer(nhc->nhc_exceptions, hash);
}
hash += hval;
@@ -789,10 +789,8 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
} else {
if (fib_lookup(net, fl4, &res, 0) == 0) {
struct fib_nh_common *nhc = FIB_RES_NHC(res);
- struct fib_nh *nh;
- nh = container_of(nhc, struct fib_nh, nh_common);
- update_or_create_fnhe(nh, fl4->daddr, new_gw,
+ update_or_create_fnhe(nhc, fl4->daddr, new_gw,
0, false,
jiffies + ip_rt_gc_timeout);
}
@@ -1040,10 +1038,8 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
rcu_read_lock();
if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) {
struct fib_nh_common *nhc = FIB_RES_NHC(res);
- struct fib_nh *nh;
- nh = container_of(nhc, struct fib_nh, nh_common);
- update_or_create_fnhe(nh, fl4->daddr, 0, mtu, lock,
+ update_or_create_fnhe(nhc, fl4->daddr, 0, mtu, lock,
jiffies + ip_rt_mtu_expires);
}
rcu_read_unlock();
@@ -1329,7 +1325,7 @@ static unsigned int ipv4_mtu(const struct dst_entry *dst)
return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
}
-static void ip_del_fnhe(struct fib_nh *nh, __be32 daddr)
+static void ip_del_fnhe(struct fib_nh_common *nhc, __be32 daddr)
{
struct fnhe_hash_bucket *hash;
struct fib_nh_exception *fnhe, __rcu **fnhe_p;
@@ -1337,7 +1333,7 @@ static void ip_del_fnhe(struct fib_nh *nh, __be32 daddr)
spin_lock_bh(&fnhe_lock);
- hash = rcu_dereference_protected(nh->nh_exceptions,
+ hash = rcu_dereference_protected(nhc->nhc_exceptions,
lockdep_is_held(&fnhe_lock));
hash += hval;
@@ -1363,9 +1359,10 @@ static void ip_del_fnhe(struct fib_nh *nh, __be32 daddr)
spin_unlock_bh(&fnhe_lock);
}
-static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr)
+static struct fib_nh_exception *find_exception(struct fib_nh_common *nhc,
+ __be32 daddr)
{
- struct fnhe_hash_bucket *hash = rcu_dereference(nh->nh_exceptions);
+ struct fnhe_hash_bucket *hash = rcu_dereference(nhc->nhc_exceptions);
struct fib_nh_exception *fnhe;
u32 hval;
@@ -1379,7 +1376,7 @@ static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr)
if (fnhe->fnhe_daddr == daddr) {
if (fnhe->fnhe_expires &&
time_after(jiffies, fnhe->fnhe_expires)) {
- ip_del_fnhe(nh, daddr);
+ ip_del_fnhe(nhc, daddr);
break;
}
return fnhe;
@@ -1406,10 +1403,9 @@ u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr)
mtu = fi->fib_mtu;
if (likely(!mtu)) {
- struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
struct fib_nh_exception *fnhe;
- fnhe = find_exception(nh, daddr);
+ fnhe = find_exception(nhc, daddr);
if (fnhe && !time_after_eq(jiffies, fnhe->fnhe_expires))
mtu = fnhe->fnhe_pmtu;
}
@@ -1759,7 +1755,6 @@ static int __mkroute_input(struct sk_buff *skb,
struct net_device *dev = nhc->nhc_dev;
struct fib_nh_exception *fnhe;
struct rtable *rth;
- struct fib_nh *nh;
int err;
struct in_device *out_dev;
bool do_cache;
@@ -1807,8 +1802,7 @@ static int __mkroute_input(struct sk_buff *skb,
}
}
- nh = container_of(nhc, struct fib_nh, nh_common);
- fnhe = find_exception(nh, daddr);
+ fnhe = find_exception(nhc, daddr);
if (do_cache) {
if (fnhe)
rth = rcu_dereference(fnhe->fnhe_rth_input);
@@ -2320,10 +2314,9 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
do_cache &= fi != NULL;
if (fi) {
struct fib_nh_common *nhc = FIB_RES_NHC(*res);
- struct fib_nh *nh = container_of(nhc, struct fib_nh, nh_common);
struct rtable __rcu **prth;
- fnhe = find_exception(nh, fl4->daddr);
+ fnhe = find_exception(nhc, fl4->daddr);
if (!do_cache)
goto add;
if (fnhe) {
--
2.11.0
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