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Commit 2ff3e4e4 authored by Pravin B Shelar's avatar Pravin B Shelar
Browse files

openvswitch: Remove pkt_key from OVS_CB 



OVS keeps pointer to packet key in skb->cb, but the packet key is
store on stack. This could make code bit tricky. So it is better to
get rid of the pointer.

Signed-off-by: default avatarPravin B Shelar <pshelar@nicira.com>
parent c1f570a6

net/openvswitch/actions.c

+12 −10
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
#include "vport.h"



static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,

			      struct sw_flow_key *key,

			      const struct nlattr *attr, int len);



static int make_writable(struct sk_buff *skb, int write_len)
@@ -410,16 +411,14 @@ static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port) 
}



static int output_userspace(struct datapath *dp, struct sk_buff *skb,

			    const struct nlattr *attr)

			    struct sw_flow_key *key, const struct nlattr *attr)

{

	struct dp_upcall_info upcall;

	const struct nlattr *a;

	int rem;



	BUG_ON(!OVS_CB(skb)->pkt_key);



	upcall.cmd = OVS_PACKET_CMD_ACTION;

	upcall.key = OVS_CB(skb)->pkt_key;

	upcall.key = key;

	upcall.userdata = NULL;

	upcall.portid = 0;
@@ -445,7 +444,7 @@ static bool last_action(const struct nlattr *a, int rem) 
}



static int sample(struct datapath *dp, struct sk_buff *skb,

		  const struct nlattr *attr)

		  struct sw_flow_key *key, const struct nlattr *attr)

{

	const struct nlattr *acts_list = NULL;

	const struct nlattr *a;
@@ -493,7 +492,7 @@ static int sample(struct datapath *dp, struct sk_buff *skb, 
	 * return the error code and let the caller (also

	 * do_execute_actions()) free skb on error.

	 */

	return do_execute_actions(dp, sample_skb, a, rem);

	return do_execute_actions(dp, sample_skb, key, a, rem);

}



static int execute_set_action(struct sk_buff *skb,
@@ -544,6 +543,7 @@ static int execute_set_action(struct sk_buff *skb, 


/* Execute a list of actions against 'skb'. */

static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,

			      struct sw_flow_key *key,

			      const struct nlattr *attr, int len)

{

	/* Every output action needs a separate clone of 'skb', but the common
@@ -569,7 +569,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, 
			break;



		case OVS_ACTION_ATTR_USERSPACE:

			output_userspace(dp, skb, a);

			output_userspace(dp, skb, key, a);

			break;



		case OVS_ACTION_ATTR_PUSH_VLAN:
@@ -587,7 +587,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, 
			break;



		case OVS_ACTION_ATTR_SAMPLE:

			err = sample(dp, skb, a);

			err = sample(dp, skb, key, a);

			if (unlikely(err)) /* skb already freed. */

				return err;

			break;
@@ -608,10 +608,12 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, 
}



/* Execute a list of actions against 'skb'. */

int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)

int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,

			struct sw_flow_key *key)

{

	struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);



	OVS_CB(skb)->tun_key = NULL;

	return do_execute_actions(dp, skb, acts->actions, acts->actions_len);

	return do_execute_actions(dp, skb, key,

				  acts->actions, acts->actions_len);

}

net/openvswitch/datapath.c

+2 −4
Original line number Diff line number Diff line
@@ -275,10 +275,9 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) 
	}



	OVS_CB(skb)->flow = flow;

	OVS_CB(skb)->pkt_key = &key;



	ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);

	ovs_execute_actions(dp, skb);

	ovs_execute_actions(dp, skb, &key);

	stats_counter = &stats->n_hit;



out:
@@ -568,7 +567,6 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 
		goto err_flow_free;



	OVS_CB(packet)->flow = flow;

	OVS_CB(packet)->pkt_key = &flow->key;

	packet->priority = flow->key.phy.priority;

	packet->mark = flow->key.phy.skb_mark;
@@ -579,7 +577,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) 
		goto err_unlock;



	local_bh_disable();

	err = ovs_execute_actions(dp, packet);

	err = ovs_execute_actions(dp, packet, &flow->key);

	local_bh_enable();

	rcu_read_unlock();

net/openvswitch/datapath.h

+2 −3
Original line number Diff line number Diff line
@@ -95,13 +95,11 @@ struct datapath { 
/**

 * struct ovs_skb_cb - OVS data in skb CB

 * @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.

 */

struct ovs_skb_cb {

	struct sw_flow		*flow;

	struct sw_flow_key	*pkt_key;

	struct ovs_key_ipv4_tunnel  *tun_key;

};

#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
@@ -191,7 +189,8 @@ int ovs_dp_upcall(struct datapath *, struct sk_buff *, 
struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,

					 u8 cmd);



int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);

int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,

			struct sw_flow_key *);

void ovs_dp_notify_wq(struct work_struct *work);



#define OVS_NLERR(fmt, ...)					\