Re: [PATCH net] virtio-net: reject small vring sizes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On Mon, Apr 17, 2023 at 06:43:39AM +0000, Alvaro Karsz wrote:
> > > +static int virtnet_validate_vqs(struct virtnet_info *vi)
> > > +{
> > > +     u32 i, min_size = roundup_pow_of_two(MAX_SKB_FRAGS + 2);
> > 
> > why power of two?
> The ring size is always a power of 2,

Not really, packed rings allow non power of 2.
Linux had a bug that it required power of 2 for packed, but
we are fixing that finally.

> so checking against
> MAX_SKB_FRAGS + 2 or against roundup_pow_of_two will result in the
> same, and I think that printing the warning with the actual min value
> is more helpful.  I can check the condition against MAX_SKB_FRAGS + 2,
> and print the rounded value in case of an error.

Virtualization mailing list

[Index of Archives]     [KVM Development]     [Libvirt Development]     [Libvirt Users]     [CentOS Virtualization]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [Kernel Newbies]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux