On Fri, Jun 12, 2015 at 07:00:28PM +0530, Pankaj Gupta wrote:
> Macvtap should be compatible with tuntap for maximum number
> of queues. '1059590254fa9dce9cafc4f07d1103dbec415e76' removes
> the limitation and increases number of queues in tuntap.
> Now, Its safe to increase number of queues in Macvtap as well.
>
> Signed-off-by: Pankaj Gupta <pagu...@redhat.com>
It's a good idea, but this might be a problem:
static void macvtap_del_queues(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
struct macvtap_queue *q, *tmp, *qlist[MAX_MACVTAP_QUEUES];
...
}
by itself, this will use 2K on stack, which seems too much.
You need to rework this function to use a linked list + list_move
instead of an array + list_del_init.
> ---
> include/linux/if_macvlan.h | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
> index 6f6929e..a4ccc31 100644
> --- a/include/linux/if_macvlan.h
> +++ b/include/linux/if_macvlan.h
> @@ -29,7 +29,7 @@ struct macvtap_queue;
> * Maximum times a macvtap device can be opened. This can be used to
> * configure the number of receive queue, e.g. for multiqueue virtio.
> */
> -#define MAX_MACVTAP_QUEUES 16
> +#define MAX_MACVTAP_QUEUES 256
>
> #define MACVLAN_MC_FILTER_BITS 8
> #define MACVLAN_MC_FILTER_SZ (1 << MACVLAN_MC_FILTER_BITS)
> --
> 1.7.1
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