Re: [ovs-dev] [PATCH] Skip processing actions when batch is emptied.

[Vishal Deep Ajmera]

Thank you William Tu for reviewing the patch. I have fixed the commit message & 
corrected subject line (by including file name) in V2 version of the patch.

Warm Regards,
Vishal

-Original Message-
From: William Tu [mailto:u9012...@gmail.com] 
Sent: Wednesday, November 15, 2017 9:19 PM
To: Vishal Deep Ajmera <vishal.deep.ajm...@ericsson.com>
Cc: d...@openvswitch.org
Subject: Re: [ovs-dev] [PATCH] Skip processing actions when batch is emptied.

On Wed, Nov 8, 2017 at 1:44 AM, Vishal Deep Ajmera 
<vishal.deep.ajm...@ericsson.com> wrote:
> Today in OVS, when errors are encountered during the execution of an action 
> the entire batch of packets may be deleted (for e.g. in processing 
> push_tnl_action, if the port is not found in the port_cache of PMD). The 
> remaining actions continue to be executed even though there are no packets to 
> be processed. It is assumed that the code dealing with each action checks 
> that the batch is not empty before executing. Crashes may occur if the 
> assumption is not met.
>
> The patch makes OVS skip processing of further actions from the action-set 
> once a batch is emptied. Doing so centralizes the check in one place and 
> avoids the possibility of crashes.
>
> Signed-off-by: Vishal Deep Ajmera <vishal.deep.ajm...@ericsson.com>
> ---

nit: please wrap your commit messages to about 75 columns

otherwise looks good to me.

Acked-by: William Tu <u9012...@gmail.com>

> lib/odp-execute.c | 9 ++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/lib/odp-execute.c b/lib/odp-execute.c index 
> 3109f39..8697727 100644
> --- a/lib/odp-execute.c
> +++ b/lib/odp-execute.c
> @@ -685,9 +685,12 @@ odp_execute_actions(void *dp, struct dp_packet_batch 
> *batch, bool steal,
>  dp_execute_action(dp, batch, a, may_steal);
> -if (last_action) {
> -/* We do not need to free the packets. 
> dp_execute_actions()
> - * has stolen them */
> +if (last_action || (batch->count == 0)) {
> +/* We do not need to free the packets.
> + * Either dp_execute_actions() has stolen them
> + * or the batch is freed due to errors. In either
> + * case we do not need to execute further actions.
> + */
>  return;
>  }
>  }
> ___
> dev mailing list
> d...@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
___
dev mailing list
d...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-dev

Re: [ovs-dev] [PATCH] Skip processing actions when batch is emptied.

[William Tu]

On Wed, Nov 8, 2017 at 1:44 AM, Vishal Deep Ajmera
 wrote:
> Today in OVS, when errors are encountered during the execution of an action 
> the entire batch of packets may be deleted (for e.g. in processing 
> push_tnl_action, if the port is not found in the port_cache of PMD). The 
> remaining actions continue to be executed even though there are no packets to 
> be processed. It is assumed that the code dealing with each action checks 
> that the batch is not empty before executing. Crashes may occur if the 
> assumption is not met.
>
> The patch makes OVS skip processing of further actions from the action-set 
> once a batch is emptied. Doing so centralizes the check in one place and 
> avoids the possibility of crashes.
>
> Signed-off-by: Vishal Deep Ajmera 
> ---

nit: please wrap your commit messages to about 75 columns

otherwise looks good to me.

Acked-by: William Tu 

> lib/odp-execute.c | 9 ++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/lib/odp-execute.c b/lib/odp-execute.c
> index 3109f39..8697727 100644
> --- a/lib/odp-execute.c
> +++ b/lib/odp-execute.c
> @@ -685,9 +685,12 @@ odp_execute_actions(void *dp, struct dp_packet_batch 
> *batch, bool steal,
>  dp_execute_action(dp, batch, a, may_steal);
> -if (last_action) {
> -/* We do not need to free the packets. 
> dp_execute_actions()
> - * has stolen them */
> +if (last_action || (batch->count == 0)) {
> +/* We do not need to free the packets.
> + * Either dp_execute_actions() has stolen them
> + * or the batch is freed due to errors. In either
> + * case we do not need to execute further actions.
> + */
>  return;
>  }
>  }
> ___
> dev mailing list
> d...@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
___
dev mailing list
d...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-dev

Re: [ovs-dev] [PATCH] Skip processing actions when batch is emptied.

[Vishal Deep Ajmera]

Hi,

Do anyone see any issues with the approach below of skipping ovs actions when 
batch is emptied ?

Warm Regards,
Vishal

-Original Message-
From: ovs-dev-boun...@openvswitch.org [mailto:ovs-dev-boun...@openvswitch.org] 
On Behalf Of Vishal Deep Ajmera
Sent: Wednesday, November 08, 2017 3:14 PM
To: d...@openvswitch.org
Subject: [ovs-dev] [PATCH] Skip processing actions when batch is emptied.

Today in OVS, when errors are encountered during the execution of an action the 
entire batch of packets may be deleted (for e.g. in processing push_tnl_action, 
if the port is not found in the port_cache of PMD). The remaining actions 
continue to be executed even though there are no packets to be processed. It is 
assumed that the code dealing with each action checks that the batch is not 
empty before executing. Crashes may occur if the assumption is not met.

The patch makes OVS skip processing of further actions from the action-set once 
a batch is emptied. Doing so centralizes the check in one place and avoids the 
possibility of crashes.

Signed-off-by: Vishal Deep Ajmera 
---
lib/odp-execute.c | 9 ++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/odp-execute.c b/lib/odp-execute.c index 3109f39..8697727 100644
--- a/lib/odp-execute.c
+++ b/lib/odp-execute.c
@@ -685,9 +685,12 @@ odp_execute_actions(void *dp, struct dp_packet_batch 
*batch, bool steal,
 dp_execute_action(dp, batch, a, may_steal);
-if (last_action) {
-/* We do not need to free the packets. dp_execute_actions()
- * has stolen them */
+if (last_action || (batch->count == 0)) {
+/* We do not need to free the packets.
+ * Either dp_execute_actions() has stolen them
+ * or the batch is freed due to errors. In either
+ * case we do not need to execute further actions.
+ */
 return;
 }
 }
___
dev mailing list
d...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-dev
___
dev mailing list
d...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-dev