Hi Renzo
The patch seems to work for multicast interface between multiple VM.
vmlinux mem=128M eth0=mcast,,239.0.1.1
...
Configured mcast device: 239.0.1.1:1102-1
Choosing a random ethernet address for device eth0
Netdevice 0 (d6:26:50:fd:f8:ef) : mcast backend multicast address:
239.0.1.1:1102, TTL:1
eth0 (uml-netdev): not using net_device_ops yet
I can ping between different umls.
But in the case of tuntap networking It does not work.
./vmlinux umid=CMM mem=128M eth1=tuntap,,,192.168.1.1
...
Choosing a random ethernet address for device eth1
Netdevice 1 (aa:ba:ea:1b:93:c6) : <6>TUN/TAP backend - IP = 192.168.1.1
eth1 (uml-netdev): not using net_device_ops yet
Inside the uml
#ifconfig eth1 up
* modprobe tun
* ifconfig tap6 192.168.1.1 netmask 255.255.255.255 up
* bash -c echo 1 > /proc/sys/net/ipv4/ip_forward
IRQ 5/eth1: IRQF_DISABLED is not guaranteed on shared IRQs
# ifconfig eth1 192.168.1.2 up
* route add -host 192.168.1.2 dev tap6
* bash -c echo 1 > /proc/sys/net/ipv4/conf/tap6/proxy_arp
But then I can not ping from host to UML, neither from UML to host.
David
On Wed, Mar 11, 2009 at 1:22 PM, Renzo Davoli <re...@cs.unibo.it> wrote:
> User-Mode Linux 2.6.29-rc* gives a lot of warnings during the boot:
>
> IRQ 2/console: IRQF_DISABLED is not guaranteed on shared IRQs
> IRQ 3/console-write: IRQF_DISABLED is not guaranteed on shared IRQs
> IRQ 5/eth0: IRQF_DISABLED is not guaranteed on shared IRQs
> IRQ 6/ssl: IRQF_DISABLED is not guaranteed on shared IRQs
> IRQ 7/ssl-write: IRQF_DISABLED is not guaranteed on shared IRQs
> IRQ 10/winch: IRQF_DISABLED is not guaranteed on shared IRQs
> ...
>
> In fact there is a warning in kernel/irq/manage.c:682.
> if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
> == (IRQF_SHARED|IRQF_DISABLED))
> pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
> "guaranteed on shared IRQs\n",
> irq, devname);
>
> Jeff,
> It is necessary to have IRQF_DISABLED for shared IRQs?
> Can IRQF_DISABLED be switched off for all shared IRQ?
> Given that the masking policy is not guaranteed already, nothing
> should change, if it works it should continue to work.
>
> VDE networking does not work on 2.6.29-rc*.
> The patch here attached seems to fix the problem.
> Is it correct to switch off the IRQF_DISABLED flag for networking IRQ?
>
> renzo
> -----
> --- arch/um/drivers/net_kern.c.orig 2009-03-11 21:16:36.000000000 +0100
> +++ arch/um/drivers/net_kern.c 2009-03-11 21:16:46.000000000 +0100
> @@ -165,7 +165,7 @@
> }
>
> err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
> - IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
> + IRQF_SHARED, dev->name, dev);
> if (err != 0) {
> printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n",
> err);
> err = -ENETUNREACH;
>
>
>
>
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