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>

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 458096d..0cce8e6 100644 (file)
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -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();

diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index b576483..2b982fa 100644 (file)
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -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 *);

diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 7064da9..d186eb6 100644 (file)
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -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);
+}

diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 5e5aaed..251789b 100644 (file)
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -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 */

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index d757848..630b320 100644 (file)
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -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,

diff --git a/net/openvswitch/flow_netlink.h b/net/openvswitch/flow_netlink.h
index 4401510..206e45a 100644 (file)
--- a/net/openvswitch/flow_netlink.h
+++ b/net/openvswitch/flow_netlink.h
@@ -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 *);

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index f7e63f9..acf31aa 100644 (file)
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -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);
 }
 
 /**