Re: [PATCH v6 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace

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

 




在 2021/4/12 下午4:02, Yongji Xie 写道:
On Mon, Apr 12, 2021 at 3:16 PM Jason Wang <jasowang@xxxxxxxxxx> wrote:

在 2021/4/9 下午4:02, Yongji Xie 写道:
+};
+
+struct vduse_dev_config_data {
+     __u32 offset; /* offset from the beginning of config space */
+     __u32 len; /* the length to read/write */
+     __u8 data[VDUSE_CONFIG_DATA_LEN]; /* data buffer used to read/write */
Note that since VDUSE_CONFIG_DATA_LEN is part of uAPI it means we can
not change it in the future.

So this might suffcient for future features or all type of virtio devices.

Do you mean 256 is no enough here?
Yes.

But this request will be submitted multiple times if config lengh is
larger than 256. So do you think whether we need to extent the size to
512 or larger?

So I think you'd better either:

1) document the limitation (256) in somewhere, (better both uapi and doc)

But the VDUSE_CONFIG_DATA_LEN doesn't mean the limitation of
configuration space. It only means the maximum size of one data
transfer for configuration space. Do you mean document this?


Yes, and another thing is that since you're using data[VDUSE_CONFIG_DATA_LEN] in the uapi, it implies the length is always 256 which seems not good and not what the code is wrote.

Thanks



Thanks,
Yongji


_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization




[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