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openvswitch: refactor ovs flow extract API. 

OVS flow extract is called on packet receive or packet
execute code path.  Following patch defines separate API
for extracting flow-key in packet execute code path.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>
This commit is contained in:
Pravin B Shelar 2014-09-15 19:20:31 -07:00
parent 2ff3e4e486
commit 83c8df26a3
7 changed files with 71 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
net/openvswitch/datapath.c
View File

@ -237,8 +237,9 @@ void ovs_dp_detach_port(struct vport *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_received_packet(struct sk_buff *skb)
{
const struct vport *p = OVS_CB(skb)->input_vport;
struct datapath *dp = p->dp;
struct sw_flow *flow;
struct dp_stats_percpu *stats;
@ -250,7 +251,7 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
stats = this_cpu_ptr(dp->stats_percpu);
/* Extract flow from 'skb' into 'key'. */
error = ovs_flow_extract(skb, p->port_no, &key);
error = ovs_flow_key_extract(skb, &key);
if (unlikely(error)) {
kfree_skb(skb);
return;
@ -514,6 +515,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
struct sw_flow *flow;
struct datapath *dp;
struct ethhdr *eth;
struct vport *input_vport;
int len;
int err;
@ -548,13 +550,11 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
if (IS_ERR(flow))
goto err_kfree_skb;
err = ovs_flow_extract(packet, -1, &flow->key);
err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
&flow->key);
if (err)
goto err_flow_free;
err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
if (err)
goto err_flow_free;
acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
err = PTR_ERR(acts);
if (IS_ERR(acts))
@ -576,6 +576,15 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
if (!dp)
goto err_unlock;
input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
if (!input_vport)
input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
if (!input_vport)
goto err_unlock;
OVS_CB(packet)->input_vport = input_vport;
local_bh_disable();
err = ovs_execute_actions(dp, packet, &flow->key);
local_bh_enable();

5
net/openvswitch/datapath.h
View File

@ -97,10 +97,13 @@ struct datapath {
* @flow: The flow associated with this packet. May be %NULL if no flow.
* @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 ovs_key_ipv4_tunnel *tun_key;
struct vport *input_vport;
};
#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
@ -181,7 +184,7 @@ static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_n
extern struct notifier_block ovs_dp_device_notifier;
extern struct genl_family dp_vport_genl_family;
void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
void ovs_dp_process_received_packet(struct sk_buff *);
void ovs_dp_detach_port(struct vport *);
int ovs_dp_upcall(struct datapath *, struct sk_buff *,
const struct dp_upcall_info *);

49
net/openvswitch/flow.c
View File

@ -16,8 +16,6 @@
* 02110-1301, USA
*/
#include "flow.h"
#include "datapath.h"
#include <linux/uaccess.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
@ -46,6 +44,10 @@
#include <net/ipv6.h>
#include <net/ndisc.h>
#include "datapath.h"
#include "flow.h"
#include "flow_netlink.h"
u64 ovs_flow_used_time(unsigned long flow_jiffies)
{
struct timespec cur_ts;
@ -420,10 +422,9 @@ invalid:
}
/**
* ovs_flow_extract - extracts a flow key from an Ethernet frame.
* key_extract - extracts a flow key from an Ethernet frame.
* @skb: sk_buff that contains the frame, with skb->data pointing to the
* Ethernet header
* @in_port: port number on which @skb was received.
* @key: output flow key
*
* The caller must ensure that skb->len >= ETH_HLEN.
@ -442,19 +443,11 @@ invalid:
* of a correct length, otherwise the same as skb->network_header.
* For other key->eth.type values it is left untouched.
*/
int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
{
int error;
struct ethhdr *eth;
memset(key, 0, sizeof(*key));
key->phy.priority = skb->priority;
if (OVS_CB(skb)->tun_key)
memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
key->phy.in_port = in_port;
key->phy.skb_mark = skb->mark;
skb_reset_mac_header(skb);
/* Link layer. We are guaranteed to have at least the 14 byte Ethernet
@ -610,6 +603,34 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
}
}
}
return 0;
}
int ovs_flow_key_extract(struct sk_buff *skb, struct sw_flow_key *key)
{
/* Extract metadata from packet. */
memset(key, 0, sizeof(*key));
if (OVS_CB(skb)->tun_key)
memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
key->phy.priority = skb->priority;
key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
key->phy.skb_mark = skb->mark;
return key_extract(skb, key);
}
int ovs_flow_key_extract_userspace(const struct nlattr *attr,
struct sk_buff *skb,
struct sw_flow_key *key)
{
int err;
memset(key, 0, sizeof(*key));
/* Extract metadata from netlink attributes. */
err = ovs_nla_get_flow_metadata(attr, key);
if (err)
return err;
return key_extract(skb, key);
}

6
net/openvswitch/flow.h
View File

@ -187,6 +187,10 @@ void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
void ovs_flow_stats_clear(struct sw_flow *);
u64 ovs_flow_used_time(unsigned long flow_jiffies);
int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
int ovs_flow_key_extract(struct sk_buff *skb, struct sw_flow_key *key);
/* Extract key from packet coming from userspace. */
int ovs_flow_key_extract_userspace(const struct nlattr *attr,
struct sk_buff *skb,
struct sw_flow_key *key);
#endif /* flow.h */

22
net/openvswitch/flow_netlink.c
View File

@ -836,7 +836,7 @@ int ovs_nla_get_match(struct sw_flow_match *match,
/**
* ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
* @flow: Receives extracted in_port, priority, tun_key and skb_mark.
* @key: Receives extracted in_port, priority, tun_key and skb_mark.
* @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
* sequence.
*
@ -846,32 +846,24 @@ int ovs_nla_get_match(struct sw_flow_match *match,
* extracted from the packet itself.
*/
int ovs_nla_get_flow_metadata(struct sw_flow *flow,
const struct nlattr *attr)
int ovs_nla_get_flow_metadata(const struct nlattr *attr,
struct sw_flow_key *key)
{
struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
struct sw_flow_match match;
u64 attrs = 0;
int err;
struct sw_flow_match match;
flow->key.phy.in_port = DP_MAX_PORTS;
flow->key.phy.priority = 0;
flow->key.phy.skb_mark = 0;
memset(tun_key, 0, sizeof(flow->key.tun_key));
err = parse_flow_nlattrs(attr, a, &attrs);
if (err)
return -EINVAL;
memset(&match, 0, sizeof(match));
match.key = &flow->key;
match.key = key;
err = metadata_from_nlattrs(&match, &attrs, a, false);
if (err)
return err;
key->phy.in_port = DP_MAX_PORTS;
return 0;
return metadata_from_nlattrs(&match, &attrs, a, false);
}
int ovs_nla_put_flow(const struct sw_flow_key *swkey,

4
net/openvswitch/flow_netlink.h
View File

@ -42,8 +42,8 @@ void ovs_match_init(struct sw_flow_match *match,
int ovs_nla_put_flow(const struct sw_flow_key *,
const struct sw_flow_key *, struct sk_buff *);
int ovs_nla_get_flow_metadata(struct sw_flow *flow,
const struct nlattr *attr);
int ovs_nla_get_flow_metadata(const struct nlattr *, struct sw_flow_key *);
int ovs_nla_get_match(struct sw_flow_match *match,
const struct nlattr *,
const struct nlattr *);

5
net/openvswitch/vport.c
View File

@ -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
@ -443,7 +443,8 @@ void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
u64_stats_update_end(&stats->syncp);
OVS_CB(skb)->tun_key = tun_key;
ovs_dp_process_received_packet(vport, skb);
OVS_CB(skb)->input_vport = vport;
ovs_dp_process_received_packet(skb);
}
/**