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ipv4: Move cached routes to fib_nh_common

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While the cached routes, nh_pcpu_rth_output and nh_rth_input, are IPv4
specific, a later patch wants to make them accessible for IPv6 nexthops
with IPv4 routes using a fib6_nh. Move the cached routes from fib_nh to
fib_nh_common and update references.

Initialization of the cached entries is moved to fib_nh_common_init,
and free is moved to fib_nh_common_release.

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 07:45:48 -07:00
committed by David S. Miller
parent a734d1f4c2
commit 0f457a3662
3 changed files with 32 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
net/ipv4/route.c
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@@ -646,6 +646,7 @@ 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)
{
struct fib_nh_common *nhc = &nh->nh_common;
struct fnhe_hash_bucket *hash;
struct fib_nh_exception *fnhe;
struct rtable *rt;
@@ -715,13 +716,13 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
* stale, so anyone caching it rechecks if this exception
* applies to them.
*/
rt = rcu_dereference(nh->nh_rth_input);
rt = rcu_dereference(nhc->nhc_rth_input);
if (rt)
rt->dst.obsolete = DST_OBSOLETE_KILL;
for_each_possible_cpu(i) {
struct rtable __rcu **prt;
prt = per_cpu_ptr(nh->nh_pcpu_rth_output, i);
prt = per_cpu_ptr(nhc->nhc_pcpu_rth_output, i);
rt = rcu_dereference(*prt);
if (rt)
rt->dst.obsolete = DST_OBSOLETE_KILL;
@@ -1471,13 +1472,14 @@ static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt)
{
struct fib_nh_common *nhc = &nh->nh_common;
struct rtable *orig, *prev, **p;
bool ret = true;
if (rt_is_input_route(rt)) {
p = (struct rtable **)&nh->nh_rth_input;
p = (struct rtable **)&nhc->nhc_rth_input;
} else {
p = (struct rtable **)raw_cpu_ptr(nh->nh_pcpu_rth_output);
p = (struct rtable **)raw_cpu_ptr(nhc->nhc_pcpu_rth_output);
}
orig = *p;
@@ -1810,7 +1812,7 @@ static int __mkroute_input(struct sk_buff *skb,
if (fnhe)
rth = rcu_dereference(fnhe->fnhe_rth_input);
else
rth = rcu_dereference(nh->nh_rth_input);
rth = rcu_dereference(nhc->nhc_rth_input);
if (rt_cache_valid(rth)) {
skb_dst_set_noref(skb, &rth->dst);
goto out;
@@ -2105,10 +2107,8 @@ local_input:
if (res->fi) {
if (!itag) {
struct fib_nh_common *nhc = FIB_RES_NHC(*res);
struct fib_nh *nh;
nh = container_of(nhc, struct fib_nh, nh_common);
rth = rcu_dereference(nh->nh_rth_input);
rth = rcu_dereference(nhc->nhc_rth_input);
if (rt_cache_valid(rth)) {
skb_dst_set_noref(skb, &rth->dst);
err = 0;
@@ -2337,7 +2337,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
do_cache = false;
goto add;
}
prth = raw_cpu_ptr(nh->nh_pcpu_rth_output);
prth = raw_cpu_ptr(nhc->nhc_pcpu_rth_output);
}
rth = rcu_dereference(*prth);
if (rt_cache_valid(rth) && dst_hold_safe(&rth->dst))