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virtio only support packed ring size power of 2

Issue discription：
When QEMU starts with "-device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,rx_queue_size=1025,tx_queue_size=1025,mq=on,vectors=15,packed=on"

It raises error: Invalid rx_queue_size (= 1025), must be a power of 2 between 256 and 1024

Analysis:
According to virtio1.1 spec, the packed queue size value does not have to be a power of 2.

Maybe the virtio need to be revised?

On Wed, May 6, 2020 at 10:51 AM xuan <email address hidden> wrote:

> Public bug reported:
>
> Issue discription：
> When QEMU starts with "-device
> virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,rx_queue_size=1025,tx_queue_size=1025,mq=on,vectors=15,packed=on"
>
> It raises error: Invalid rx_queue_size (= 1025), must be a power of 2
> between 256 and 1024
>
> Analysis:
> According to virtio1.1 spec, the packed queue size value does not have to
> be a power of 2.
>
> ** Affects: qemu
>      Importance: Undecided
>          Status: New
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1877015
>
> Title:
>   virtio only support packed ring size power of 2 between 256 and 1024
>
> Status in QEMU:
>   New
>
> Bug description:
>   Issue discription：
>   When QEMU starts with "-device
> virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,rx_queue_size=1025,tx_queue_size=1025,mq=on,vectors=15,packed=on"
>
>   It raises error: Invalid rx_queue_size (= 1025), must be a power of 2
>   between 256 and 1024
>
>   Analysis:
>   According to virtio1.1 spec, the packed queue size value does not have
> to be a power of 2.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1877015/+subscriptions
>
>

-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo


Thank you for your reply. I think the code should add the handling for packed ring size to follow the spec.

Thank you for your reply.  I think the code should add the handling for packed ring size to follow the spec.

-----Original Message-----
From: <email address hidden> <email address hidden> On Behalf Of Yonggang Luo
Sent: Wednesday, May 6, 2020 12:32 PM
To: Ding, Xuan <email address hidden>
Subject: Re: [Bug 1877015] [NEW] virtio only support packed ring size power of 2 between 256 and 1024

Maybe the virtio need to be revised?

On Wed, May 6, 2020 at 10:51 AM xuan <email address hidden> wrote:

> Public bug reported:
>
> Issue discription：
> When QEMU starts with "-device
> virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,rx_queue_size=1025,tx_queue_size=1025,mq=on,vectors=15,packed=on"
>
> It raises error: Invalid rx_queue_size (= 1025), must be a power of 2 
> between 256 and 1024
>
> Analysis:
> According to virtio1.1 spec, the packed queue size value does not have 
> to be a power of 2.
>
> ** Affects: qemu
>      Importance: Undecided
>          Status: New
>
> --
> You received this bug notification because you are a member of qemu- 
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1877015
>
> Title:
>   virtio only support packed ring size power of 2 between 256 and 1024
>
> Status in QEMU:
>   New
>
> Bug description:
>   Issue discription：
>   When QEMU starts with "-device
> virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,rx_queue_size=1025,tx_queue_size=1025,mq=on,vectors=15,packed=on"
>
>   It raises error: Invalid rx_queue_size (= 1025), must be a power of 2
>   between 256 and 1024
>
>   Analysis:
>   According to virtio1.1 spec, the packed queue size value does not 
> have to be a power of 2.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1877015/+subscriptions
>
>

-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo

--
You received this bug notification because you are subscribed to the bug report.
https://bugs.launchpad.net/bugs/1877015

Title:
  virtio only support packed ring size power of 2

Status in QEMU:
  New

Bug description:
  Issue discription：
  When QEMU starts with "-device virtio-net-pci,netdev=netdev0,mac=52:54:00:00:00:01,disable-modern=false,mrg_rxbuf=on,rx_queue_size=1025,tx_queue_size=1025,mq=on,vectors=15,packed=on"

  It raises error: Invalid rx_queue_size (= 1025), must be a power of 2
  between 256 and 1024

  Analysis:
  According to virtio1.1 spec, the packed queue size value does not have to be a power of 2.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1877015/+subscriptions


The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting older bugs to "Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.



This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/270