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Message-Id: <1405556305-1740-1-git-send-email-pshelar@nicira.com>
Date: Wed, 16 Jul 2014 17:18:25 -0700
From: Pravin B Shelar <pshelar@...ira.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, Andy Zhou <azhou@...ira.com>,
Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net-next v4 03/11] openvswitch: Add hash action
From: Andy Zhou <azhou@...ira.com>
OVS hash action calculates 5-tupple hash and set hash in flow-key
hash. This can be used along with recirculation for distributing
packets among different ports.
For example:
OVS bonding can use following actions:
Match on: bond flow; Action: hash, recirc(id)
Match on: recirc-id == id and hash lower bits == a;
Action: output port_bond_a
Signed-off-by: Andy Zhou <azhou@...ira.com>
Acked-by: Jesse Gross <jesse@...ira.com>
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
include/uapi/linux/openvswitch.h | 24 ++++++++++++++++++++++++
net/openvswitch/actions.c | 19 +++++++++++++++++++
net/openvswitch/flow.h | 1 +
net/openvswitch/flow_netlink.c | 27 ++++++++++++++++++++++++++-
4 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index a794d1d..eaf2d68 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -289,6 +289,8 @@ enum ovs_key_attr {
OVS_KEY_ATTR_TUNNEL, /* Nested set of ovs_tunnel attributes */
OVS_KEY_ATTR_SCTP, /* struct ovs_key_sctp */
OVS_KEY_ATTR_TCP_FLAGS, /* be16 TCP flags. */
+ OVS_KEY_ATTR_DP_HASH, /* u32 hash value. Value 0 indicates the hash
+ is not computed by the datapath. */
#ifdef __KERNEL__
OVS_KEY_ATTR_IPV4_TUNNEL, /* struct ovs_key_ipv4_tunnel */
@@ -493,6 +495,27 @@ struct ovs_action_push_vlan {
__be16 vlan_tci; /* 802.1Q TCI (VLAN ID and priority). */
};
+/* Data path hash algorithm for computing Datapath hash.
+ *
+ * The algorithm type only specifies the fields in a flow
+ * will be used as part of the hash. Each datapath is free
+ * to use its own hash algorithm. The hash value will be
+ * opaque to the user space daemon.
+ */
+enum ovs_hash_alg {
+ OVS_HASH_ALG_L4,
+};
+
+/*
+ * struct ovs_action_hash - %OVS_ACTION_ATTR_HASH action argument.
+ * @hash_alg: Algorithm used to compute hash prior to recirculation.
+ * @hash_basis: basis used for computing hash.
+ */
+struct ovs_action_hash {
+ uint32_t hash_alg; /* One of ovs_hash_alg. */
+ uint32_t hash_basis;
+};
+
/**
* enum ovs_action_attr - Action types.
*
@@ -521,6 +544,7 @@ enum ovs_action_attr {
OVS_ACTION_ATTR_PUSH_VLAN, /* struct ovs_action_push_vlan. */
OVS_ACTION_ATTR_POP_VLAN, /* No argument. */
OVS_ACTION_ATTR_SAMPLE, /* Nested OVS_SAMPLE_ATTR_*. */
+ OVS_ACTION_ATTR_HASH, /* struct ovs_action_hash. */
__OVS_ACTION_ATTR_MAX
};
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index c36856a..56c22f0 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -459,6 +459,21 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
nla_len(acts_list), true);
}
+static void execute_hash(struct sk_buff *skb, const struct nlattr *attr)
+{
+ struct sw_flow_key *key = OVS_CB(skb)->pkt_key;
+ struct ovs_action_hash *hash_act = nla_data(attr);
+ u32 hash = 0;
+
+ /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
+ hash = skb_get_hash(skb);
+ hash = jhash_1word(hash, hash_act->hash_basis);
+ if (!hash)
+ hash = 0x1;
+
+ key->ovs_flow_hash = hash;
+}
+
static int execute_set_action(struct sk_buff *skb,
const struct nlattr *nested_attr)
{
@@ -535,6 +550,10 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
output_userspace(dp, skb, a);
break;
+ case OVS_ACTION_ATTR_HASH:
+ execute_hash(skb, a);
+ break;
+
case OVS_ACTION_ATTR_PUSH_VLAN:
err = push_vlan(skb, nla_data(a));
if (unlikely(err)) /* skb already freed. */
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index ac395d2..ae15599 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -72,6 +72,7 @@ struct sw_flow_key {
u32 skb_mark; /* SKB mark. */
u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
} __packed phy; /* Safe when right after 'tun_key'. */
+ u32 ovs_flow_hash; /* Datapath computed hash value. */
struct {
u8 src[ETH_ALEN]; /* Ethernet source address. */
u8 dst[ETH_ALEN]; /* Ethernet destination address. */
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index d757848..504f794 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -251,6 +251,7 @@ static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
[OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
[OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
[OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
+ [OVS_KEY_ATTR_DP_HASH] = sizeof(u32),
[OVS_KEY_ATTR_TUNNEL] = -1,
};
@@ -454,6 +455,13 @@ static int ipv4_tun_to_nlattr(struct sk_buff *skb,
static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
const struct nlattr **a, bool is_mask)
{
+ if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
+ u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
+
+ SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
+ *attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
+ }
+
if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
SW_FLOW_KEY_PUT(match, phy.priority,
nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
@@ -858,6 +866,7 @@ int ovs_nla_get_flow_metadata(struct sw_flow *flow,
flow->key.phy.in_port = DP_MAX_PORTS;
flow->key.phy.priority = 0;
flow->key.phy.skb_mark = 0;
+ flow->key.ovs_flow_hash = 0;
memset(tun_key, 0, sizeof(flow->key.tun_key));
err = parse_flow_nlattrs(attr, a, &attrs);
@@ -881,6 +890,9 @@ int ovs_nla_put_flow(const struct sw_flow_key *swkey,
struct nlattr *nla, *encap;
bool is_mask = (swkey != output);
+ if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
+ goto nla_put_failure;
+
if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
goto nla_put_failure;
@@ -1413,7 +1425,8 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
[OVS_ACTION_ATTR_POP_VLAN] = 0,
[OVS_ACTION_ATTR_SET] = (u32)-1,
- [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
+ [OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
+ [OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash)
};
const struct ovs_action_push_vlan *vlan;
int type = nla_type(a);
@@ -1440,6 +1453,18 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
return -EINVAL;
break;
+ case OVS_ACTION_ATTR_HASH: {
+ const struct ovs_action_hash *act_hash = nla_data(a);
+
+ switch (act_hash->hash_alg) {
+ case OVS_HASH_ALG_L4:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ break;
+ }
case OVS_ACTION_ATTR_POP_VLAN:
break;
--
1.9.3
--
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