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openvswitch: Enable memory mapped Netlink i/o

Browse source 
Use memory mapped Netlink i/o for all unicast openvswitch
communication if a ring has been set up.

Benchmark
  * pktgen -> ovs internal port
  * 5M pkts, 5M flows
  * 4 threads, 8 cores

Before:
Result: OK: 67418743(c67108212+d310530) usec, 5000000 (9000byte,0frags)
  74163pps 5339Mb/sec (5339736000bps) errors: 0
	+   2.98%     ovs-vswitchd  [k] copy_user_generic_string
	+   2.49%     ovs-vswitchd  [k] memcpy
	+   1.84%       kpktgend_2  [k] memcpy
	+   1.81%       kpktgend_1  [k] memcpy
	+   1.81%       kpktgend_3  [k] memcpy
	+   1.78%       kpktgend_0  [k] memcpy

After:
Result: OK: 24229690(c24127165+d102524) usec, 5000000 (9000byte,0frags)
  206358pps 14857Mb/sec (14857776000bps) errors: 0
	+   2.80%     ovs-vswitchd  [k] memcpy
	+   1.31%       kpktgend_2  [k] memcpy
	+   1.23%       kpktgend_0  [k] memcpy
	+   1.09%       kpktgend_1  [k] memcpy
	+   1.04%       kpktgend_3  [k] memcpy
	+   0.96%     ovs-vswitchd  [k] copy_user_generic_string

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Reviewed-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Thomas Graf 2013-11-30 13:21:32 +01:00 committed by Jesse Gross
parent aae9f0e22c
commit 795449d8b8
1 changed files with 29 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

56
net/openvswitch/datapath.c
View file

@ -402,6 +402,11 @@ static int queue_userspace_packet(struct net *net, int dp_ifindex,
struct sk_buff *nskb = NULL;
struct sk_buff *user_skb; /* to be queued to userspace */
struct nlattr *nla;
struct genl_info info = {
.dst_sk = net->genl_sock,
.snd_portid = upcall_info->portid,
};
size_t len;
int err;
if (vlan_tx_tag_present(skb)) {
@ -422,7 +427,8 @@ static int queue_userspace_packet(struct net *net, int dp_ifindex,
goto out;
}
user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
len = upcall_msg_size(skb, upcall_info->userdata);
user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
if (!user_skb) {
err = -ENOMEM;
goto out;
@ -725,27 +731,30 @@ static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
return err;
}
static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
struct genl_info *info)
{
const struct sw_flow_actions *sf_acts;
size_t len;
sf_acts = ovsl_dereference(flow->sf_acts);
len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts));
return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
return genlmsg_new_unicast(len, info, GFP_KERNEL);
}
static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
struct datapath *dp,
u32 portid, u32 seq, u8 cmd)
struct genl_info *info,
u8 cmd)
{
struct sk_buff *skb;
int retval;
skb = ovs_flow_cmd_alloc_info(flow);
skb = ovs_flow_cmd_alloc_info(flow, info);
if (!skb)
return ERR_PTR(-ENOMEM);
retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid,
info->snd_seq, 0, cmd);
BUG_ON(retval < 0);
return skb;
}
@ -826,8 +835,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
goto err_flow_free;
}
reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
info->snd_seq, OVS_FLOW_CMD_NEW);
reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
} else {
/* We found a matching flow. */
struct sw_flow_actions *old_acts;
@ -855,8 +863,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
rcu_assign_pointer(flow->sf_acts, acts);
ovs_nla_free_flow_actions(old_acts);
reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
info->snd_seq, OVS_FLOW_CMD_NEW);
reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
/* Clear stats. */
if (a[OVS_FLOW_ATTR_CLEAR]) {
@ -918,8 +925,7 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
goto unlock;
}
reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
info->snd_seq, OVS_FLOW_CMD_NEW);
reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
goto unlock;
@ -966,7 +972,7 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
goto unlock;
}
reply = ovs_flow_cmd_alloc_info(flow);
reply = ovs_flow_cmd_alloc_info(flow, info);
if (!reply) {
err = -ENOMEM;
goto unlock;
@ -1118,17 +1124,17 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
return -EMSGSIZE;
}
static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
u32 seq, u8 cmd)
static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
struct genl_info *info, u8 cmd)
{
struct sk_buff *skb;
int retval;
skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd);
if (retval < 0) {
kfree_skb(skb);
return ERR_PTR(retval);
@ -1223,8 +1229,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
goto err_destroy_ports_array;
}
reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
info->snd_seq, OVS_DP_CMD_NEW);
reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
err = PTR_ERR(reply);
if (IS_ERR(reply))
goto err_destroy_local_port;
@ -1290,8 +1295,7 @@ static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
if (IS_ERR(dp))
goto unlock;
reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
info->snd_seq, OVS_DP_CMD_DEL);
reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL);
err = PTR_ERR(reply);
if (IS_ERR(reply))
goto unlock;
@ -1319,8 +1323,7 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
if (IS_ERR(dp))
goto unlock;
reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
info->snd_seq, OVS_DP_CMD_NEW);
reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
@ -1351,8 +1354,7 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
goto unlock;
}
reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
info->snd_seq, OVS_DP_CMD_NEW);
reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
goto unlock;