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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 <[email protected]>
Acked-by: Martin KaFai Lau <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Wei Wang 2017-06-17 10:42:42 -07:00 • committed by David S. Miller
commit a4c2fd7f78
8 changed files with 17 additions and 25 deletions
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4
net/ipv6/ip6_fib.c
View file

@ -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:

7
net/ipv6/route.c
View file

@ -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;
}