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Date: Fri, 31 Aug 2018 17:49:42 -0700
From: dsahern@...nel.org
To: netdev@...r.kernel.org
Cc: roopa@...ulusnetworks.com, sharpd@...ulusnetworks.com,
idosch@...lanox.com, davem@...emloft.net,
David Ahern <dsahern@...il.com>
Subject: [PATCH RFC net-next 07/18] net: ipv4: Add fib_nh to fib_result
From: David Ahern <dsahern@...il.com>
Add nexthop selection to fib_result and update FIB_RES macros to
use it. Right now, fib_nh in fib_result will point to a nexthop
within a fib_info. Later, fib_nh can point to data with a nexthop.
Signed-off-by: David Ahern <dsahern@...il.com>
---
include/net/ip_fib.h | 21 +++++++++------------
net/core/filter.c | 2 +-
net/ipv4/fib_frontend.c | 4 ++--
net/ipv4/fib_semantics.c | 4 ++--
net/ipv4/fib_trie.c | 4 ++--
net/ipv4/route.c | 18 +++++++++---------
6 files changed, 25 insertions(+), 28 deletions(-)
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index ce9b92485064..0b40c59b8a5f 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -141,6 +141,7 @@ struct fib_result {
unsigned char type;
unsigned char scope;
u32 tclassid;
+ struct fib_nh *nh;
struct fib_info *fi;
struct fib_table *table;
struct hlist_head *fa_head;
@@ -161,11 +162,7 @@ struct fib_result_nl {
int err;
};
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
-#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
-#else /* CONFIG_IP_ROUTE_MULTIPATH */
-#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
-#endif /* CONFIG_IP_ROUTE_MULTIPATH */
+#define FIB_RES_NH(res) ((res).nh)
#ifdef CONFIG_IP_MULTIPLE_TABLES
#define FIB_TABLE_HASHSZ 256
@@ -177,13 +174,13 @@ __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh,
unsigned char scope);
#define FIB_RES_SADDR(net, res) \
- ((FIB_RES_NH(res).nh_saddr_genid == \
+ ((FIB_RES_NH(res)->nh_saddr_genid == \
atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
- FIB_RES_NH(res).nh_saddr : \
- fib_info_update_nh_saddr((net), &FIB_RES_NH(res), (res).fi->fib_scope))
-#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
-#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
-#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
+ FIB_RES_NH(res)->nh_saddr : \
+ fib_info_update_nh_saddr((net), FIB_RES_NH(res), (res).fi->fib_scope))
+#define FIB_RES_GW(res) (FIB_RES_NH(res)->nh_gw)
+#define FIB_RES_DEV(res) (FIB_RES_NH(res)->nh_dev)
+#define FIB_RES_OIF(res) (FIB_RES_NH(res)->nh_oif)
#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
FIB_RES_SADDR(net, res))
@@ -422,7 +419,7 @@ static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
#ifdef CONFIG_IP_MULTIPLE_TABLES
u32 rtag;
#endif
- *itag = FIB_RES_NH(*res).nh_tclassid<<16;
+ *itag = FIB_RES_NH(*res)->nh_tclassid << 16;
#ifdef CONFIG_IP_MULTIPLE_TABLES
rtag = res->tclassid;
if (*itag == 0)
diff --git a/net/core/filter.c b/net/core/filter.c
index c25eb36f1320..0ba4c477415d 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4311,7 +4311,7 @@ static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
return BPF_FIB_LKUP_RET_FRAG_NEEDED;
}
- nh = &res.fi->fib_nh[res.nh_sel];
+ nh = res.nh;
/* do not handle lwt encaps right now */
if (nh->nh_lwtstate)
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index b0910d8c8bd4..2f9bf1ec2678 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -380,7 +380,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
dev_match = true;
#endif
if (dev_match) {
- ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
+ ret = FIB_RES_NH(res)->nh_scope >= RT_SCOPE_HOST;
return ret;
}
if (no_addr)
@@ -392,7 +392,7 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
ret = 0;
if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) {
if (res.type == RTN_UNICAST)
- ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
+ ret = FIB_RES_NH(res)->nh_scope >= RT_SCOPE_HOST;
}
return ret;
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 0d792666821a..53e38ecfdd58 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -1728,7 +1728,7 @@ void fib_select_multipath(struct fib_result *res, int hash)
if (!fib_good_nh(nh))
continue;
if (!first) {
- res->nh_sel = nhsel;
+ res->nh = &fi->fib_nh[nhsel];
first = true;
}
}
@@ -1736,7 +1736,7 @@ void fib_select_multipath(struct fib_result *res, int hash)
if (hash > atomic_read(&nh->nh_upper_bound))
continue;
- res->nh_sel = nhsel;
+ res->nh = &fi->fib_nh[nhsel];
return;
} endfor_nexthops(fi);
}
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 5bc0c89e81e4..51e7b38f3a7b 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1468,7 +1468,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
if (fi->fib_flags & RTNH_F_DEAD)
continue;
for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
- const struct fib_nh *nh = &fi->fib_nh[nhsel];
+ struct fib_nh *nh = &fi->fib_nh[nhsel];
struct in_device *in_dev = __in_dev_get_rcu(nh->nh_dev);
if (nh->nh_flags & RTNH_F_DEAD)
@@ -1489,7 +1489,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
res->prefix = htonl(n->key);
res->prefixlen = KEYLENGTH - fa->fa_slen;
- res->nh_sel = nhsel;
+ res->nh = nh;
res->type = fa->fa_type;
res->scope = fi->fib_scope;
res->fi = fi;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b678466da451..1297c7c934a8 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -776,7 +776,7 @@ static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flow
neigh_event_send(n, NULL);
} else {
if (fib_lookup(net, fl4, &res, 0) == 0) {
- struct fib_nh *nh = &FIB_RES_NH(res);
+ struct fib_nh *nh = FIB_RES_NH(res);
update_or_create_fnhe(nh, fl4->daddr, new_gw,
0, false,
@@ -1021,7 +1021,7 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
rcu_read_lock();
if (fib_lookup(dev_net(dst->dev), fl4, &res, 0) == 0) {
- struct fib_nh *nh = &FIB_RES_NH(res);
+ struct fib_nh *nh = FIB_RES_NH(res);
update_or_create_fnhe(nh, fl4->daddr, 0, mtu, lock,
jiffies + ip_rt_mtu_expires);
@@ -1350,7 +1350,7 @@ static struct fib_nh_exception *find_exception(struct fib_nh *nh, __be32 daddr)
u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr)
{
struct fib_info *fi = res->fi;
- struct fib_nh *nh = &fi->fib_nh[res->nh_sel];
+ struct fib_nh *nh = res->nh;
struct net_device *dev = nh->nh_dev;
u32 mtu = 0;
@@ -1527,7 +1527,7 @@ static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
bool cached = false;
if (fi) {
- struct fib_nh *nh = &FIB_RES_NH(*res);
+ struct fib_nh *nh = FIB_RES_NH(*res);
if (nh->nh_gw && nh->nh_scope == RT_SCOPE_LINK) {
rt->rt_gateway = nh->nh_gw;
@@ -1744,12 +1744,12 @@ static int __mkroute_input(struct sk_buff *skb,
}
}
- fnhe = find_exception(&FIB_RES_NH(*res), daddr);
+ fnhe = find_exception(FIB_RES_NH(*res), daddr);
if (do_cache) {
if (fnhe)
rth = rcu_dereference(fnhe->fnhe_rth_input);
else
- rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input);
+ rth = rcu_dereference(FIB_RES_NH(*res)->nh_rth_input);
if (rt_cache_valid(rth)) {
skb_dst_set_noref(skb, &rth->dst);
goto out;
@@ -2039,7 +2039,7 @@ out: return err;
do_cache = false;
if (res->fi) {
if (!itag) {
- rth = rcu_dereference(FIB_RES_NH(*res).nh_rth_input);
+ rth = rcu_dereference(FIB_RES_NH(*res)->nh_rth_input);
if (rt_cache_valid(rth)) {
skb_dst_set_noref(skb, &rth->dst);
err = 0;
@@ -2069,7 +2069,7 @@ out: return err;
}
if (do_cache) {
- struct fib_nh *nh = &FIB_RES_NH(*res);
+ struct fib_nh *nh = FIB_RES_NH(*res);
rth->dst.lwtstate = lwtstate_get(nh->nh_lwtstate);
if (lwtunnel_input_redirect(rth->dst.lwtstate)) {
@@ -2249,7 +2249,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
do_cache &= fi != NULL;
if (fi) {
struct rtable __rcu **prth;
- struct fib_nh *nh = &FIB_RES_NH(*res);
+ struct fib_nh *nh = FIB_RES_NH(*res);
fnhe = find_exception(nh, fl4->daddr);
if (!do_cache)
--
2.11.0
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