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authorWei Wang <weiwan@google.com>2017-06-17 20:42:42 +0300
committerDavid S. Miller <davem@davemloft.net>2017-06-18 05:54:01 +0300
commita4c2fd7f78915a0d7c5275e7612e7793157a01f2 (patch)
tree67797baa578f3492c80ef57a9eaf0d31040833f5 /net
parentb2a9c0ed75a32e788d034a58a18f2fc46396e412 (diff)
downloadlinux-a4c2fd7f78915a0d7c5275e7612e7793157a01f2.tar.xz
net: remove DST_NOCACHE flag
DST_NOCACHE flag check has been removed from dst_release() and dst_hold_safe() in a previous patch because all the dst are now ref counted properly and can be released based on refcnt only. Looking at the rest of the DST_NOCACHE use, all of them can now be removed or replaced with other checks. So this patch gets rid of all the DST_NOCACHE usage and remove this flag completely. Signed-off-by: Wei Wang <weiwan@google.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dst.c2
-rw-r--r--net/ipv4/route.c23
-rw-r--r--net/ipv6/ip6_fib.c4
-rw-r--r--net/ipv6/route.c7
-rw-r--r--net/xfrm/xfrm_policy.c1
5 files changed, 15 insertions, 22 deletions
diff --git a/net/core/dst.c b/net/core/dst.c
index 70543dabb797..f851adb9ec9b 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -270,7 +270,7 @@ static void __metadata_dst_init(struct metadata_dst *md_dst, u8 optslen)
dst = &md_dst->dst;
dst_init(dst, &md_dst_ops, NULL, 1, DST_OBSOLETE_NONE,
- DST_METADATA | DST_NOCACHE | DST_NOCOUNT);
+ DST_METADATA | DST_NOCOUNT);
dst->input = dst_md_discard;
dst->output = dst_md_discard_out;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 9a0f496f8bf4..c816cd53f7fc 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1299,7 +1299,7 @@ static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr)
}
static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
- __be32 daddr)
+ __be32 daddr, const bool do_cache)
{
bool ret = false;
@@ -1328,7 +1328,7 @@ static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe,
if (!rt->rt_gateway)
rt->rt_gateway = daddr;
- if (!(rt->dst.flags & DST_NOCACHE)) {
+ if (do_cache) {
dst_hold(&rt->dst);
rcu_assign_pointer(*porig, rt);
if (orig) {
@@ -1441,7 +1441,8 @@ static bool rt_cache_valid(const struct rtable *rt)
static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
const struct fib_result *res,
struct fib_nh_exception *fnhe,
- struct fib_info *fi, u16 type, u32 itag)
+ struct fib_info *fi, u16 type, u32 itag,
+ const bool do_cache)
{
bool cached = false;
@@ -1462,8 +1463,8 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
#endif
rt->dst.lwtstate = lwtstate_get(nh->nh_lwtstate);
if (unlikely(fnhe))
- cached = rt_bind_exception(rt, fnhe, daddr);
- else if (!(rt->dst.flags & DST_NOCACHE))
+ cached = rt_bind_exception(rt, fnhe, daddr, do_cache);
+ else if (do_cache)
cached = rt_cache_route(nh, rt);
if (unlikely(!cached)) {
/* Routes we intend to cache in nexthop exception or
@@ -1471,7 +1472,6 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
* However, if we are unsuccessful at storing this
* route into the cache we really need to set it.
*/
- rt->dst.flags |= DST_NOCACHE;
if (!rt->rt_gateway)
rt->rt_gateway = daddr;
rt_add_uncached_list(rt);
@@ -1494,7 +1494,7 @@ struct rtable *rt_dst_alloc(struct net_device *dev,
struct rtable *rt;
rt = dst_alloc(&ipv4_dst_ops, dev, 1, DST_OBSOLETE_FORCE_CHK,
- (will_cache ? 0 : (DST_HOST | DST_NOCACHE)) |
+ (will_cache ? 0 : DST_HOST) |
(nopolicy ? DST_NOPOLICY : 0) |
(noxfrm ? DST_NOXFRM : 0));
@@ -1738,7 +1738,8 @@ rt_cache:
rth->dst.input = ip_forward;
- rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag);
+ rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag,
+ do_cache);
set_lwt_redirect(rth);
skb_dst_set(skb, &rth->dst);
out:
@@ -2026,10 +2027,8 @@ local_input:
rth->dst.input = lwtunnel_input;
}
- if (unlikely(!rt_cache_route(nh, rth))) {
- rth->dst.flags |= DST_NOCACHE;
+ if (unlikely(!rt_cache_route(nh, rth)))
rt_add_uncached_list(rth);
- }
}
skb_dst_set(skb, &rth->dst);
err = 0;
@@ -2260,7 +2259,7 @@ add:
#endif
}
- rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0);
+ rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0, do_cache);
set_lwt_redirect(rth);
return rth;
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index c67ec79bf0da..4f3e4657f2d6 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -975,8 +975,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
int replace_required = 0;
int sernum = fib6_new_sernum(info->nl_net);
- if (WARN_ON_ONCE((rt->dst.flags & DST_NOCACHE) &&
- !atomic_read(&rt->dst.__refcnt)))
+ if (WARN_ON_ONCE(!atomic_read(&rt->dst.__refcnt)))
return -EINVAL;
if (info->nlh) {
@@ -1073,7 +1072,6 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt,
fib6_start_gc(info->nl_net, rt);
if (!(rt->rt6i_flags & RTF_CACHE))
fib6_prune_clones(info->nl_net, pn);
- rt->dst.flags &= ~DST_NOCACHE;
}
out:
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6b6528fa3292..2e4490076061 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -128,7 +128,6 @@ static void rt6_uncached_list_add(struct rt6_info *rt)
{
struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
- rt->dst.flags |= DST_NOCACHE;
rt->rt6i_uncached_list = ul;
spin_lock_bh(&ul->lock);
@@ -1326,7 +1325,7 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
rt6_dst_from_metrics_check(rt);
if (rt->rt6i_flags & RTF_PCPU ||
- (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
+ (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
return rt6_dst_from_check(rt, cookie);
else
return rt6_check(rt, cookie);
@@ -2130,8 +2129,7 @@ static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
struct fib6_table *table;
struct net *net = dev_net(rt->dst.dev);
- if (rt == net->ipv6.ip6_null_entry ||
- rt->dst.flags & DST_NOCACHE) {
+ if (rt == net->ipv6.ip6_null_entry) {
err = -ENOENT;
goto out;
}
@@ -2722,7 +2720,6 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
rt->rt6i_dst.plen = 128;
tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
rt->rt6i_table = fib6_get_table(net, tb_id);
- rt->dst.flags |= DST_NOCACHE;
return rt;
}
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 3f7e77f11112..af8e38f47b5b 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2231,7 +2231,6 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
}
dst_hold(&xdst->u.dst);
- xdst->u.dst.flags |= DST_NOCACHE;
route = xdst->route;
}
}