[ovs-dev] [PATCH 2/2] datapath: Simplify do_execute_actions().
Jarno Rajahalme
jarno at ovn.org
Fri Mar 3 19:03:45 UTC 2017
Acked-by: Jarno Rajahalme <jarno at ovn.org>
> On Mar 2, 2017, at 7:29 PM, Joe Stringer <joe at ovn.org> wrote:
>
> From: andy zhou <azhou at ovn.org>
>
> Upstream commit:
> commit 5b8784aaf29be20ba8d363e1124d7436d42ef9bf
> Author: Andy Zhou <azhou at ovn.org>
> Date: Fri Jan 27 13:45:28 2017 -0800
>
> openvswitch: Simplify do_execute_actions().
>
> do_execute_actions() implements a worthwhile optimization: in case
> an output action is the last action in an action list, skb_clone()
> can be avoided by outputing the current skb. However, the
> implementation is more complicated than necessary. This patch
> simplify this logic.
>
> Signed-off-by: Andy Zhou <azhou at ovn.org>
> Acked-by: Pravin B Shelar <pshelar at ovn.org>
> Signed-off-by: David S. Miller <davem at davemloft.net>
>
> Upstream: 5b8784aaf29b ("openvswitch: Simplify do_execute_actions().")
> Signed-off-by: Joe Stringer <joe at ovn.org>
> ---
> datapath/actions.c | 42 ++++++++++++++++++++----------------------
> 1 file changed, 20 insertions(+), 22 deletions(-)
>
> diff --git a/datapath/actions.c b/datapath/actions.c
> index 3af34357ecd0..abb6637133b0 100644
> --- a/datapath/actions.c
> +++ b/datapath/actions.c
> @@ -1125,12 +1125,6 @@ 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
> - * case is just a single output action, so that doing a clone and
> - * then freeing the original skbuff is wasteful. So the following code
> - * is slightly obscure just to avoid that.
> - */
> - int prev_port = -1;
> const struct nlattr *a;
> int rem;
>
> @@ -1138,20 +1132,28 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
> a = nla_next(a, &rem)) {
> int err = 0;
>
> - 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, key);
> + switch (nla_type(a)) {
> + case OVS_ACTION_ATTR_OUTPUT: {
> + int port = nla_get_u32(a);
> + struct sk_buff *clone;
> +
> + /* Every output action needs a separate clone
> + * of 'skb', In case the output action is the
> + * last action, cloning can be avoided.
> + */
> + if (nla_is_last(a, rem)) {
> + do_output(dp, skb, port, key);
> + /* 'skb' has been used for output.
> + */
> + return 0;
> + }
>
> + clone = skb_clone(skb, GFP_ATOMIC);
> + if (clone)
> + do_output(dp, clone, port, key);
> OVS_CB(skb)->cutlen = 0;
> - prev_port = -1;
> - }
> -
> - switch (nla_type(a)) {
> - case OVS_ACTION_ATTR_OUTPUT:
> - prev_port = nla_get_u32(a);
> break;
> + }
>
> case OVS_ACTION_ATTR_TRUNC: {
> struct ovs_action_trunc *trunc = nla_data(a);
> @@ -1241,11 +1243,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
> }
> }
>
> - if (prev_port != -1)
> - do_output(dp, skb, prev_port, key);
> - else
> - consume_skb(skb);
> -
> + consume_skb(skb);
> return 0;
> }
>
> --
> 2.11.1
>
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