[RFC,net-next,02/12] vhost_net: introduce vhost_exceeds_weight()
diff mbox series

Message ID 1526893473-20128-3-git-send-email-jasowang@redhat.com
State New, archived
Headers show
Series
  • XDP batching for TUN/vhost_net
Related show

Commit Message

Jason Wang May 21, 2018, 9:04 a.m. UTC
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vhost/net.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

Comments

Jesse Brandeburg May 21, 2018, 4:29 p.m. UTC | #1
On Mon, 21 May 2018 17:04:23 +0800 Jason wrote:
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  drivers/vhost/net.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index 15d191a..de544ee 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -479,6 +479,12 @@ static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter,
>  	return len;
>  }
>  
> +static bool vhost_exceeds_weight(int pkts, int total_len)
> +{
> +	return unlikely(total_len >= VHOST_NET_WEIGHT) ||
> +	       unlikely(pkts >= VHOST_NET_PKT_WEIGHT);

I was going to say just one unlikely, but then the caller of this
function also says unlikely(vhost_exceeds...), so I think you should
just drop the unlikely statements here (both of them)

> +}
> +
>  /* Expects to be always run from workqueue - which acts as
>   * read-size critical section for our kind of RCU. */
>  static void handle_tx(struct vhost_net *net)
> @@ -570,7 +576,6 @@ static void handle_tx(struct vhost_net *net)
>  			msg.msg_control = NULL;
>  			ubufs = NULL;
>  		}
> -

unrelated whitespace changes?

>  		total_len += len;
>  		if (total_len < VHOST_NET_WEIGHT &&
>  		    !vhost_vq_avail_empty(&net->dev, vq) &&
> @@ -600,8 +605,7 @@ static void handle_tx(struct vhost_net *net)
>  		else
>  			vhost_zerocopy_signal_used(net, vq);
>  		vhost_net_tx_packet(net);
> -		if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
> -		    unlikely(++sent_pkts >= VHOST_NET_PKT_WEIGHT)) {
> +		if (unlikely(vhost_exceeds_weight(++sent_pkts, total_len))) {
>  			vhost_poll_queue(&vq->poll);
>  			break;
>  		}
> @@ -887,8 +891,7 @@ static void handle_rx(struct vhost_net *net)
>  		if (unlikely(vq_log))
>  			vhost_log_write(vq, vq_log, log, vhost_len);
>  		total_len += vhost_len;
> -		if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
> -		    unlikely(++recv_pkts >= VHOST_NET_PKT_WEIGHT)) {
> +		if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) {
>  			vhost_poll_queue(&vq->poll);
>  			goto out;
>  		}
Jason Wang May 22, 2018, 12:27 p.m. UTC | #2
On 2018年05月22日 00:29, Jesse Brandeburg wrote:
> On Mon, 21 May 2018 17:04:23 +0800 Jason wrote:
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   drivers/vhost/net.c | 13 ++++++++-----
>>   1 file changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
>> index 15d191a..de544ee 100644
>> --- a/drivers/vhost/net.c
>> +++ b/drivers/vhost/net.c
>> @@ -479,6 +479,12 @@ static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter,
>>   	return len;
>>   }
>>   
>> +static bool vhost_exceeds_weight(int pkts, int total_len)
>> +{
>> +	return unlikely(total_len >= VHOST_NET_WEIGHT) ||
>> +	       unlikely(pkts >= VHOST_NET_PKT_WEIGHT);
> I was going to say just one unlikely, but then the caller of this
> function also says unlikely(vhost_exceeds...), so I think you should
> just drop the unlikely statements here (both of them)

Ok.

>
>> +}
>> +
>>   /* Expects to be always run from workqueue - which acts as
>>    * read-size critical section for our kind of RCU. */
>>   static void handle_tx(struct vhost_net *net)
>> @@ -570,7 +576,6 @@ static void handle_tx(struct vhost_net *net)
>>   			msg.msg_control = NULL;
>>   			ubufs = NULL;
>>   		}
>> -
> unrelated whitespace changes?

Yes.

Thanks

>
>>   		total_len += len;
>>   		if (total_len < VHOST_NET_WEIGHT &&
>>   		    !vhost_vq_avail_empty(&net->dev, vq) &&
>> @@ -600,8 +605,7 @@ static void handle_tx(struct vhost_net *net)
>>   		else
>>   			vhost_zerocopy_signal_used(net, vq);
>>   		vhost_net_tx_packet(net);
>> -		if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
>> -		    unlikely(++sent_pkts >= VHOST_NET_PKT_WEIGHT)) {
>> +		if (unlikely(vhost_exceeds_weight(++sent_pkts, total_len))) {
>>   			vhost_poll_queue(&vq->poll);
>>   			break;
>>   		}
>> @@ -887,8 +891,7 @@ static void handle_rx(struct vhost_net *net)
>>   		if (unlikely(vq_log))
>>   			vhost_log_write(vq, vq_log, log, vhost_len);
>>   		total_len += vhost_len;
>> -		if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
>> -		    unlikely(++recv_pkts >= VHOST_NET_PKT_WEIGHT)) {
>> +		if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) {
>>   			vhost_poll_queue(&vq->poll);
>>   			goto out;
>>   		}

Patch
diff mbox series

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 15d191a..de544ee 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -479,6 +479,12 @@  static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter,
 	return len;
 }
 
+static bool vhost_exceeds_weight(int pkts, int total_len)
+{
+	return unlikely(total_len >= VHOST_NET_WEIGHT) ||
+	       unlikely(pkts >= VHOST_NET_PKT_WEIGHT);
+}
+
 /* Expects to be always run from workqueue - which acts as
  * read-size critical section for our kind of RCU. */
 static void handle_tx(struct vhost_net *net)
@@ -570,7 +576,6 @@  static void handle_tx(struct vhost_net *net)
 			msg.msg_control = NULL;
 			ubufs = NULL;
 		}
-
 		total_len += len;
 		if (total_len < VHOST_NET_WEIGHT &&
 		    !vhost_vq_avail_empty(&net->dev, vq) &&
@@ -600,8 +605,7 @@  static void handle_tx(struct vhost_net *net)
 		else
 			vhost_zerocopy_signal_used(net, vq);
 		vhost_net_tx_packet(net);
-		if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
-		    unlikely(++sent_pkts >= VHOST_NET_PKT_WEIGHT)) {
+		if (unlikely(vhost_exceeds_weight(++sent_pkts, total_len))) {
 			vhost_poll_queue(&vq->poll);
 			break;
 		}
@@ -887,8 +891,7 @@  static void handle_rx(struct vhost_net *net)
 		if (unlikely(vq_log))
 			vhost_log_write(vq, vq_log, log, vhost_len);
 		total_len += vhost_len;
-		if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
-		    unlikely(++recv_pkts >= VHOST_NET_PKT_WEIGHT)) {
+		if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) {
 			vhost_poll_queue(&vq->poll);
 			goto out;
 		}