Recirculation implementation for Linux kernel data path.
Signed-off-by: Andy Zhou <az...@nicira.com>
---
V2 -> v3: * save the input port in OVS_CB
* Allow recirc_id to be masked like any other key attribute.
* DO not force recirc_id to be exact match.
* Needs corresponding user space changes I am still working.
* Sending this out as RFC
---
datapath/actions.c | 39 ++++++++++++++++++++++++++++++++++++++-
datapath/datapath.c | 40 +++++++++++++++++++++++++---------------
datapath/datapath.h | 8 ++++++--
datapath/flow.h | 1 +
datapath/flow_netlink.c | 17 +++++++++++++++++
5 files changed, 87 insertions(+), 18 deletions(-)
diff --git a/datapath/actions.c b/datapath/actions.c
index 820075f..9307ee1 100644
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
@@ -519,6 +519,26 @@ static int execute_set_action(struct sk_buff *skb,
return err;
}
+static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
+ const struct nlattr *a)
+{
+ struct sw_flow_key recirc_key;
+ const struct vport *p = OVS_CB(skb)->input_vport;
+ uint32_t hash = OVS_CB(skb)->pkt_key->ovs_flow_hash;
+ int err;
+
+ err = ovs_flow_extract(skb, p->port_no, &recirc_key);
+ if (err)
+ return err;
+
+ recirc_key.ovs_flow_hash = hash;
+ recirc_key.recirc_id = nla_get_u32(a);
+
+ ovs_dp_process_packet_with_key(skb, &recirc_key);
+
+ return 0;
+}
+
/* Execute a list of actions against 'skb'. */
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
const struct nlattr *attr, int len, bool keep_skb)
@@ -563,6 +583,23 @@ static int do_execute_actions(struct datapath *dp, struct
sk_buff *skb,
err = pop_vlan(skb);
break;
+ case OVS_ACTION_ATTR_RECIRC: {
+ struct sk_buff *recirc_skb;
+ const bool last_action = (a->nla_len == rem);
+
+ if (!last_action || keep_skb)
+ recirc_skb = skb_clone(skb, GFP_ATOMIC);
+ else
+ recirc_skb = skb;
+
+ err = execute_recirc(dp, recirc_skb, a);
+
+ if (last_action || err)
+ return err;
+
+ break;
+ }
+
case OVS_ACTION_ATTR_SET:
err = execute_set_action(skb, nla_data(a));
break;
diff --git a/datapath/datapath.c b/datapath/datapath.c
index 6dfe69d..d6144ee 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -240,33 +240,25 @@ void ovs_dp_detach_port(struct vport *p)
ovs_vport_del(p);
}
-/* Must be called with rcu_read_lock. */
-void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
+void ovs_dp_process_packet_with_key(struct sk_buff *skb,
+ struct sw_flow_key *pkt_key)
{
+ const struct vport *p = OVS_CB(skb)->input_vport;
struct datapath *dp = p->dp;
struct sw_flow *flow;
struct dp_stats_percpu *stats;
- struct sw_flow_key key;
u64 *stats_counter;
u32 n_mask_hit;
- int error;
stats = this_cpu_ptr(dp->stats_percpu);
- /* Extract flow from 'skb' into 'key'. */
- error = ovs_flow_extract(skb, p->port_no, &key);
- if (unlikely(error)) {
- kfree_skb(skb);
- return;
- }
-
/* Look up flow. */
- flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
+ flow = ovs_flow_tbl_lookup_stats(&dp->table, pkt_key, &n_mask_hit);
if (unlikely(!flow)) {
struct dp_upcall_info upcall;
upcall.cmd = OVS_PACKET_CMD_MISS;
- upcall.key = &key;
+ upcall.key = pkt_key;
upcall.userdata = NULL;
upcall.portid = ovs_vport_find_upcall_portid(p, skb);
ovs_dp_upcall(dp, skb, &upcall);
@@ -275,10 +267,10 @@ void ovs_dp_process_received_packet(struct vport *p,
struct sk_buff *skb)
goto out;
}
+ OVS_CB(skb)->pkt_key = pkt_key;
OVS_CB(skb)->flow = flow;
- OVS_CB(skb)->pkt_key = &key;
- ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);
+ ovs_flow_stats_update(OVS_CB(skb)->flow, pkt_key->tp.flags, skb);
ovs_execute_actions(dp, skb);
stats_counter = &stats->n_hit;
@@ -290,6 +282,24 @@ out:
u64_stats_update_end(&stats->sync);
}
+/* Must be called with rcu_read_lock. */
+void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
+{
+ int error;
+ struct sw_flow_key key;
+
+ OVS_CB(skb)->input_vport = p;
+
+ /* Extract flow from 'skb' into 'key'. */
+ error = ovs_flow_extract(skb, p->port_no, &key);
+ if (unlikely(error)) {
+ kfree_skb(skb);
+ return;
+ }
+
+ ovs_dp_process_packet_with_key(skb, &key);
+}
+
int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
const struct dp_upcall_info *upcall_info)
{
diff --git a/datapath/datapath.h b/datapath/datapath.h
index 40e0f90..1f162fd 100644
--- a/datapath/datapath.h
+++ b/datapath/datapath.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2007-2012 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
@@ -99,12 +99,14 @@ struct datapath {
* @flow: The flow associated with this packet. May be %NULL if no flow.
* @pkt_key: The flow information extracted from the packet. Must be nonnull.
* @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
- * packet is not being tunneled.
+ * @input_vport: The original vport packet came in on. This value is cached
+ * when a packet is received by OVS.
*/
struct ovs_skb_cb {
struct sw_flow *flow;
struct sw_flow_key *pkt_key;
struct ovs_key_ipv4_tunnel *tun_key;
+ struct vport *input_vport;
};
#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
@@ -188,6 +190,8 @@ extern struct genl_family dp_vport_genl_family;
extern struct genl_multicast_group ovs_dp_vport_multicast_group;
void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
+void ovs_dp_process_packet_with_key(struct sk_buff *,
+ struct sw_flow_key *pkt_key);
void ovs_dp_detach_port(struct vport *);
int ovs_dp_upcall(struct datapath *, struct sk_buff *,
const struct dp_upcall_info *);
diff --git a/datapath/flow.h b/datapath/flow.h
index a4cb57e..d05a9f4 100644
--- a/datapath/flow.h
+++ b/datapath/flow.h
@@ -75,6 +75,7 @@ struct sw_flow_key {
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. */
+ u32 recirc_id; /* Recirculation ID. */
struct {
u8 src[ETH_ALEN]; /* Ethernet source address. */
u8 dst[ETH_ALEN]; /* Ethernet destination address. */
diff --git a/datapath/flow_netlink.c b/datapath/flow_netlink.c
index f464a5b..6edf54b 100644
--- a/datapath/flow_netlink.c
+++ b/datapath/flow_netlink.c
@@ -253,6 +253,7 @@ static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
[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_RECIRC_ID] = sizeof(u32),
[OVS_KEY_ATTR_TUNNEL] = -1,
};
@@ -469,6 +470,13 @@ static int metadata_from_nlattrs(struct sw_flow_match
*match, u64 *attrs,
*attrs &= ~(1ULL << OVS_KEY_ATTR_DP_HASH);
}
+ if (*attrs & (1ULL << OVS_KEY_ATTR_RECIRC_ID)) {
+ u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
+
+ SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
+ *attrs &= ~(1ULL << OVS_KEY_ATTR_RECIRC_ID);
+ }
+
if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
SW_FLOW_KEY_PUT(match, phy.priority,
nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
@@ -874,6 +882,7 @@ int ovs_nla_get_flow_metadata(struct sw_flow *flow,
flow->key.phy.priority = 0;
flow->key.phy.skb_mark = 0;
flow->key.ovs_flow_hash = 0;
+ flow->key.recirc_id = 0;
memset(tun_key, 0, sizeof(flow->key.tun_key));
err = parse_flow_nlattrs(attr, a, &attrs);
@@ -902,6 +911,10 @@ int ovs_nla_put_flow(const struct sw_flow_key *swkey,
output->ovs_flow_hash)))
goto nla_put_failure;
+ if ((swkey->recirc_id) &&
+ (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id)))
+ goto nla_put_failure;
+
if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
goto nla_put_failure;
@@ -1438,6 +1451,7 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
/* Expected argument lengths, (u32)-1 for variable length. */
static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
+ [OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct
ovs_action_push_vlan),
[OVS_ACTION_ATTR_POP_VLAN] = 0,
@@ -1494,6 +1508,9 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
return -EINVAL;
break;
+ case OVS_ACTION_ATTR_RECIRC:
+ break;
+
case OVS_ACTION_ATTR_SET:
err = validate_set(a, key, sfa, &skip_copy);
if (err)
--
1.9.1
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