linux-kernel - Re: [RFC 2/4] tuntap: Publish tuntap maximum number of queues as module

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140820105817.GB1916@nanopsycho.orion>
Date:	Wed, 20 Aug 2014 12:58:17 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Pankaj Gupta <pagupta@...hat.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net, jasowang@...hat.com, mst@...hat.com,
	dgibson@...hat.com, vfalico@...il.com, edumazet@...gle.com,
	vyasevic@...hat.com, hkchu@...gle.com, wuzhy@...ux.vnet.ibm.com,
	xemul@...allels.com, therbert@...gle.com,
	bhutchings@...arflare.com, xii@...gle.com,
	stephen@...workplumber.org
Subject: Re: [RFC 2/4] tuntap: Publish tuntap maximum number of queues as
 module_param

Mon, Aug 18, 2014 at 03:37:18PM CEST, pagupta@...hat.com wrote:
> This patch publishes maximum number of tun/tap queues allocated as a
> read_only module parameter which a user space application like libvirt
> can make use of to limit maximum number of queues. Value of read_only
> module parameter can be writable only at module load time. If no value is set
> at module load time a default value 256 is used which is equal to maximum number
> of vCPUS allowed by KVM.
>
> Administrator can specify maximum number of queues only at the driver
> module load time.
>
>Signed-off-by: Pankaj Gupta <pagupta@...hat.com>
>---
> drivers/net/tun.c |   13 +++++++++++--
> 1 files changed, 11 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/tun.c b/drivers/net/tun.c
>index acaaf67..1f518e2 100644
>--- a/drivers/net/tun.c
>+++ b/drivers/net/tun.c
>@@ -119,6 +119,9 @@ struct tap_filter {
> 
> #define TUN_FLOW_EXPIRE (3 * HZ)
> 
>+static int max_tap_queues = MAX_TAP_QUEUES;
>+module_param(max_tap_queues, int, S_IRUGO);

Please do not introduce new module paramaters. Please other ways to
interchange values with userspace.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/