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net: remove DST_NOCACHE flag

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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>
This commit is contained in:
Wei Wang
2017-06-17 10:42:42 -07:00
committed by David S. Miller
parent b2a9c0ed75
commit a4c2fd7f78
8 changed files with 17 additions and 25 deletions
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23
net/ipv4/route.c
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@@ -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;