korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-24 20:54:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

ipv4: Move exception bucket to nh_common

Browse Source 
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@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-30 07:45:50 -07:00 committed by David S. Miller
parent 87063a1fa6
commit a5995e7107
3 changed files with 24 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ip_fib.h
View File

@ -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

12
net/ipv4/fib_semantics.c
View File

@ -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 */
@ -1713,12 +1713,12 @@ 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;
@ -1749,7 +1749,7 @@ 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);
}
}

41
net/ipv4/route.c
View File

@ -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;
}
@ -1760,7 +1756,6 @@ 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;
@ -1808,8 +1803,7 @@ 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);
@ -2321,10 +2315,9 @@ 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) {