[dpdk-dev] [PATCH] vhost: Introduce vhost-user's REPLY_ACK feature

[Maxime Coquelin]

On 12/13/2016 10:56 AM, Yuanhan Liu wrote:
> On Mon, Dec 12, 2016 at 06:54:00PM +0100, Maxime Coquelin wrote:
>> REPLY_ACK features provide a generic way for QEMU to ensure both
>> completion and success of a request.
>>
>> As described in vhost-user spec in QEMU repository, QEMU sets
>> VHOST_USER_NEED_REPLY flag (bit 3) when expecting a reply_ack from
>> the backend. Backend must reply with 0 for success or non-zero
>> otherwise when flag is set.
>>
>> Currently, only VHOST_USER_SET_MEM_TABLE request implements reply_ack,
>> in order to synchronize mapping updates.
>>
>> This patch enables REPLY_ACK feature generally, but only checks error
>> code for VHOST_USER_SET_MEM_TABLE.
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
>
> Thanks for the patch: it looks good and straightforward to me.
Good!

>
>> ---
>> Hi,
>>
>> The intend of this patch is not to fix a known issue, but it is
>> nice to have this feature, and it will be used by upcoming MTU
>> feature if it remains in its current form.
>
> Just asking, when do you plan to send out the patches?
As soon as QEMU part is accepted, because changes in QEMU series
may impact DPDK's one.

Cheers,
Maxime