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| author | Andy Zhou <azhou@nicira.com> | 2014-09-08 07:35:02 (GMT) |
|---|---|---|
| committer | Pravin B Shelar <pshelar@nicira.com> | 2014-11-06 07:52:34 (GMT) |
| commit | 738967b8bf57e582db1a23ce773c36fefd4b7d37 (patch) | |
| tree | b8a6a56e9eaa280fc10371002bb6d8fef790ab04 /net/openvswitch/actions.c | |
| parent | 426cda5cc177301f9c196f3a9b6a1287051ba599 (diff) | |
| download | linux-738967b8bf57e582db1a23ce773c36fefd4b7d37.tar.xz | |
openvswitch: refactor do_output() to move NULL check out of fast path
skb_clone() NULL check is implemented in do_output(), as past of the
common (fast) path. Refactoring so that NULL check is done in the
slow path, immediately after skb_clone() is called.
Besides optimization, this change also improves code readability by
making the skb_clone() NULL check consistent within OVS datapath
module.
Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Diffstat (limited to 'net/openvswitch/actions.c')
| -rw-r--r-- | net/openvswitch/actions.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index 930b1b6..9fd33c0 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c @@ -551,21 +551,14 @@ static int set_sctp(struct sk_buff *skb, return 0; } -static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port) +static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port) { - struct vport *vport; + struct vport *vport = ovs_vport_rcu(dp, out_port); - if (unlikely(!skb)) - return -ENOMEM; - - vport = ovs_vport_rcu(dp, out_port); - if (unlikely(!vport)) { + if (likely(vport)) + ovs_vport_send(vport, skb); + else kfree_skb(skb); - return -ENODEV; - } - - ovs_vport_send(vport, skb); - return 0; } static int output_userspace(struct datapath *dp, struct sk_buff *skb, @@ -768,8 +761,12 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, a = nla_next(a, &rem)) { int err = 0; - if (prev_port != -1) { - do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); + if (unlikely(prev_port != -1)) { + struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC); + + if (out_skb) + do_output(dp, out_skb, prev_port); + prev_port = -1; } |