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route: Add multipath_hash in flowi_common to make user-define hash 

Current fib_multipath_hash_policy can make hash based on the L3 or
L4. But it only work on the outer IP. So a specific tunnel always
has the same hash value. But a specific tunnel may contain so many
inner connections.

This patch provide a generic multipath_hash in floi_common. It can
make a user-define hash which can mix with L3 or L4 hash.

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wenxu 2019-02-24 11:36:20 +08:00 committed by David S. Miller
parent 8f4ef499c6
commit 24ba14406c
6 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
View File

@ -305,7 +305,7 @@ mlxsw_sp_span_gretap4_route(const struct net_device *to_dev,
parms = mlxsw_sp_ipip_netdev_parms4(to_dev);
ip_tunnel_init_flow(&fl4, parms.iph.protocol, *daddrp, *saddrp,
0, 0, parms.link, tun->fwmark);
0, 0, parms.link, tun->fwmark, 0);
rt = ip_route_output_key(tun->net, &fl4);
if (IS_ERR(rt))

2
include/net/flow.h
View File

@ -40,6 +40,7 @@ struct flowi_common {
__u32 flowic_secid;
kuid_t flowic_uid;
struct flowi_tunnel flowic_tun_key;
__u32 flowic_multipath_hash;
};
union flowi_uli {
@ -78,6 +79,7 @@ struct flowi4 {
#define flowi4_secid __fl_common.flowic_secid
#define flowi4_tun_key __fl_common.flowic_tun_key
#define flowi4_uid __fl_common.flowic_uid
#define flowi4_multipath_hash __fl_common.flowic_multipath_hash
/* (saddr,daddr) must be grouped, same order as in IP header */
__be32 saddr;

3
include/net/ip_tunnels.h
View File

@ -241,7 +241,7 @@ static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
int proto,
__be32 daddr, __be32 saddr,
__be32 key, __u8 tos, int oif,
__u32 mark)
__u32 mark, __u32 tun_inner_hash)
{
memset(fl4, 0, sizeof(*fl4));
fl4->flowi4_oif = oif;
@ -251,6 +251,7 @@ static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
fl4->flowi4_proto = proto;
fl4->fl4_gre_key = key;
fl4->flowi4_mark = mark;
fl4->flowi4_multipath_hash = tun_inner_hash;
}
int ip_tunnel_init(struct net_device *dev);

2
net/ipv4/ip_gre.c
View File

@ -578,7 +578,7 @@ static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
key = &info->key;
ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src,
tunnel_id_to_key32(key->tun_id), key->tos, 0,
skb->mark);
skb->mark, skb_get_hash(skb));
rt = ip_route_output_key(dev_net(dev), &fl4);
if (IS_ERR(rt))
return PTR_ERR(rt);

6
net/ipv4/ip_tunnel.c
View File

@ -310,7 +310,7 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr,
iph->saddr, tunnel->parms.o_key,
RT_TOS(iph->tos), tunnel->parms.link,
tunnel->fwmark);
tunnel->fwmark, 0);
rt = ip_route_output_key(tunnel->net, &fl4);
if (!IS_ERR(rt)) {
@ -584,7 +584,7 @@ void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
}
ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
0, skb->mark);
0, skb->mark, skb_get_hash(skb));
if (tunnel->encap.type != TUNNEL_ENCAP_NONE)
goto tx_error;
@ -744,7 +744,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr,
tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link,
tunnel->fwmark);
tunnel->fwmark, skb_get_hash(skb));
if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0)
goto tx_error;

4
net/ipv4/route.c
View File

@ -1820,6 +1820,7 @@ out:
int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
const struct sk_buff *skb, struct flow_keys *flkeys)
{
u32 multipath_hash = fl4->flowi4_multipath_hash;
struct flow_keys hash_keys;
u32 mhash;
@ -1870,6 +1871,9 @@ int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
}
mhash = flow_hash_from_keys(&hash_keys);
if (multipath_hash)
mhash = jhash_2words(mhash, multipath_hash, 0);
return mhash >> 1;
}
#endif /* CONFIG_IP_ROUTE_MULTIPATH */