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UPSTREAM: ipv4: Support multipath hashing on inner IP pkts for GRE tunnel

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Multipath hash policy value of 0 isn't distributing since the outer IP
dest and src aren't varied eventhough the inner ones are. Since the flow
is on the inner ones in the case of tunneled traffic, hashing on them is
desired.

This is done mainly for IP over GRE, hence only tested for that. But
anything else supported by flow dissection should work.

v2: Use skb_flow_dissect_flow_keys() directly so that other tunneling
    can be supported through flow dissection (per Nikolay Aleksandrov).
v3: Remove accidental inclusion of ports in the hash keys and clarify
    the documentation (Nikolay Alexandrov).
Change-Id: I0d364a630b27883285024c23c2e31b8325b272b4
Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Suryaputra
2019-06-13 14:38:58 -04:00
committed by Nolen Johnson
parent 44c760b495
commit 3bbee950fa
3 changed files with 19 additions and 1 deletions
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1
Documentation/networking/ip-sysctl.txt
View File

@ -80,6 +80,7 @@ fib_multipath_hash_policy - INTEGER
Possible values:
0 - Layer 3
1 - Layer 4
2 - Layer 3 or inner Layer 3 if present
ip_forward_update_priority - INTEGER
Whether to update SKB priority from "TOS" field in IPv4 header after it

17
net/ipv4/route.c
View File

@ -1971,6 +1971,23 @@ int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
hash_keys.basic.ip_proto = fl4->flowi4_proto;
}
break;
case 2:
memset(&hash_keys, 0, sizeof(hash_keys));
hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
/* skb is currently provided only when forwarding */
if (skb) {
struct flow_keys keys;
skb_flow_dissect_flow_keys(skb, &keys, 0);
hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;
hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;
} else {
/* Same as case 0 */
hash_keys.addrs.v4addrs.src = fl4->saddr;
hash_keys.addrs.v4addrs.dst = fl4->daddr;
}
break;
}
mhash = flow_hash_from_keys(&hash_keys);

2
net/ipv4/sysctl_net_ipv4.c
View File

@ -974,7 +974,7 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_fib_multipath_hash_policy,
.extra1 = &zero,
.extra2 = &one,
.extra2 = &two,
},
#endif
{