[PATCH net v3 0/2] xen-net{front,back}: respect user provided max_queues

[PATCH net v3 0/2] xen-net{front,back}: respect user provided max_queues

[Wei Liu]

Wei Liu (2):
  xen-netback: respect user provided max_queues
  xen-netfront: respect user provided max_queues

 drivers/net/xen-netback/netback.c | 7 +++++--
 drivers/net/xen-netfront.c        | 7 +++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

-- 
2.1.4

[PATCH net v3 1/2] xen-netback: respect user provided max_queues

[Wei Liu]

Originally that parameter was always reset to num_online_cpus during
module initialisation, which renders it useless.

The fix is to only set max_queues to num_online_cpus when user has not
provided a value.

Reported-by: Johnny Strom <johnny.strom@linuxsolutions.fi>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
 drivers/net/xen-netback/netback.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 42569b9..f585c6a 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -2105,8 +2105,11 @@ static int __init netback_init(void)
 	if (!xen_domain())
 		return -ENODEV;
 
-	/* Allow as many queues as there are CPUs, by default */
-	xenvif_max_queues = num_online_cpus();
+	/* Allow as many queues as there are CPUs if user has not
+	 * specified a value.
+	 */
+	if (xenvif_max_queues == 0)
+		xenvif_max_queues = num_online_cpus();
 
 	if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
 		pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",
-- 
2.1.4

[PATCH net v3 2/2] xen-netfront: respect user provided max_queues

[Wei Liu]

Originally that parameter was always reset to num_online_cpus during
module initialisation, which renders it useless.

The fix is to only set max_queues to num_online_cpus when user has not
provided a value.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
---
v3: fix copy-n-paste error to make netfront compile
---
 drivers/net/xen-netfront.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index e27e6d2..b9c637a 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -2132,8 +2132,11 @@ static int __init netif_init(void)
 
 	pr_info("Initialising Xen virtual ethernet driver\n");
 
-	/* Allow as many queues as there are CPUs, by default */
-	xennet_max_queues = num_online_cpus();
+	/* Allow as many queues as there are CPUs if user has not
+	 * specified a value.
+	 */
+	if (xennet_max_queues == 0)
+		xennet_max_queues = num_online_cpus();
 
 	return xenbus_register_frontend(&netfront_driver);
 }
-- 
2.1.4

Re: [Xen-devel] [PATCH net v3 2/2] xen-netfront: respect user provided max_queues

[David Vrabel]

On 10/09/15 11:18, Wei Liu wrote:
> Originally that parameter was always reset to num_online_cpus during
> module initialisation, which renders it useless.
> 
> The fix is to only set max_queues to num_online_cpus when user has not
> provided a value.

Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Tested-by: David Vrabel <david.vrabel@citrix.com>

David

> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -2132,8 +2132,11 @@ static int __init netif_init(void)
>  
>  	pr_info("Initialising Xen virtual ethernet driver\n");
>  
> -	/* Allow as many queues as there are CPUs, by default */
> -	xennet_max_queues = num_online_cpus();
> +	/* Allow as many queues as there are CPUs if user has not
> +	 * specified a value.
> +	 */
> +	if (xennet_max_queues == 0)
> +		xennet_max_queues = num_online_cpus();
>  
>  	return xenbus_register_frontend(&netfront_driver);
>  }
> 

Re: [PATCH net v3 0/2] xen-net{front,back}: respect user provided max_queues

[David Miller]

From: Wei Liu <wei.liu2@citrix.com>
Date: Thu, 10 Sep 2015 11:18:56 +0100

> Wei Liu (2):
>   xen-netback: respect user provided max_queues
>   xen-netfront: respect user provided max_queues

This looks better, series applied, thanks.