vhost: rework RARP packet injection

  Caught by code review, this copy is unnecessary.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 lib/vhost/virtio_net.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)
  

On 9/15/21 4:54 PM, David Marchand wrote:
> Caught by code review, this copy is unnecessary.
> 
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> ---
>  lib/vhost/virtio_net.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> index 8549afbbe1..1d30ad0fd9 100644
> --- a/lib/vhost/virtio_net.c
> +++ b/lib/vhost/virtio_net.c
> @@ -3364,6 +3364,8 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
>  			count = 0;
>  			goto out;
>  		}
> +		pkts[0] = rarp_mbuf;
> +		pkts++;
>  		count -= 1;
>  	}
>  
> @@ -3386,15 +3388,8 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
>  out_access_unlock:
>  	rte_spinlock_unlock(&vq->access_lock);
>  
> -	if (unlikely(rarp_mbuf != NULL)) {
> -		/*
> -		 * Inject it to the head of "pkts" array, so that switch's mac
> -		 * learning table will get updated first.
> -		 */
> -		memmove(&pkts[1], pkts, count * sizeof(struct rte_mbuf *));
> -		pkts[0] = rarp_mbuf;
> +	if (unlikely(rarp_mbuf != NULL))
>  		count += 1;
> -	}
>  
>  	return count;
>  }
> 

That's indeed much better!

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
  

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Wednesday, September 15, 2021 10:55 PM
> To: dev@dpdk.org
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>; Xia, Chenbo
> <chenbo.xia@intel.com>
> Subject: [PATCH] vhost: rework RARP packet injection
> 
> Caught by code review, this copy is unnecessary.
> 
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> ---
>  lib/vhost/virtio_net.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> --
> 2.23.0

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

Thanks!
  

On 9/15/21 16:54, David Marchand wrote:
> Caught by code review, this copy is unnecessary.
> 
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> ---
>   lib/vhost/virtio_net.c | 11 +++--------
>   1 file changed, 3 insertions(+), 8 deletions(-)
> 

Applied to dpdk-next-virtio/main.

Thanks,
Maxime
  

On 9/28/21 17:32, Maxime Coquelin wrote:
> 
> 
> On 9/15/21 16:54, David Marchand wrote:
>> Caught by code review, this copy is unnecessary.
>>
>> Signed-off-by: David Marchand <david.marchand@redhat.com>
>> ---
>>   lib/vhost/virtio_net.c | 11 +++--------
>>   1 file changed, 3 insertions(+), 8 deletions(-)
>>
> 
> Applied to dpdk-next-virtio/main.
> 
> Thanks,
> Maxime
> 

As you suggested on IRC, I added back the comment that got removed:

@@ -3136,6 +3136,12 @@ rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
                         count = 0;
                         goto out;
                 }
+               /*
+                * Inject it to the head of "pkts" array, so that 
switch's mac
+                * learning table will get updated first.
+                */
+               pkts[0] = rarp_mbuf;
+               pkts++;
                 count -= 1;
         }

Regards,
Maxime