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>

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index d038927..997ef25 100644 (file)
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -563,7 +563,7 @@ static void vrf_rt6_release(struct net_device *dev, struct net_vrf *vrf)
 
 static int vrf_rt6_create(struct net_device *dev)
 {
-       int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM | DST_NOCACHE;
+       int flags = DST_HOST | DST_NOPOLICY | DST_NOXFRM;
        struct net_vrf *vrf = netdev_priv(dev);
        struct net *net = dev_net(dev);
        struct fib6_table *rt6i_table;

diff --git a/include/net/dst.h b/include/net/dst.h
index 1be82f6..642483e 100644 (file)
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -51,7 +51,6 @@ struct dst_entry {
 #define DST_HOST               0x0001
 #define DST_NOXFRM             0x0002
 #define DST_NOPOLICY           0x0004
-#define DST_NOCACHE            0x0010
 #define DST_NOCOUNT            0x0020
 #define DST_FAKE_RTABLE                0x0040
 #define DST_XFRM_TUNNEL                0x0080

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index aa50e2e..1a88008 100644 (file)
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -170,7 +170,7 @@ static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
 {
        if (rt->rt6i_flags & RTF_PCPU ||
-           (unlikely(rt->dst.flags & DST_NOCACHE) && rt->dst.from))
+           (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
                rt = (struct rt6_info *)(rt->dst.from);
 
        return rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;

diff --git a/net/core/dst.c b/net/core/dst.c
index 70543da..f851adb 100644 (file)
--- 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 9a0f496..c816cd5 100644 (file)
--- 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 c67ec79..4f3e465 100644 (file)
--- 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 6b6528f..2e44900 100644 (file)
--- 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 3f7e77f..af8e38f 100644 (file)
--- 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;
                }
        }