Re: [PATCH] vhost: enable CONFIG feature

[陈浩 <chenh@yusur.tech>]

On 2022/9/26 15:26, Xia, Chenbo wrote:
>> -----Original Message-----
>> From: Hao Chen <chenh@yusur.tech>
>> Sent: Tuesday, September 13, 2022 5:55 PM
>> To: maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>
>> Cc: dev@dpdk.org; houyl@yusur.tech; zy@yusur.tech; Hao Chen
>> <chenh@yusur.tech>
>> Subject: [PATCH] vhost: enable CONFIG feature
>>
>> Enable this feature, so that libvirt or qemu can call vdpa vendor
>> driver's ops '.get_config' through 'vhost_net_get_config' to get
>> the mac address of the vdpa hardware without manual configuration.
> I think we should add this in vendor's vdpa driver, not in common library.
> Because some hardware and the sw back-end can't support get/set config.
>
> Thanks,
> Chenbo

In function 'rte_vhost_driver_get_protocol_features' at 
lib/vhost/socket.c, "*protocol_features = vsocket->protocol_features & 
vdpa_protocol_features". If you want vdpa driver to support VHOST_ USER_ 
PROTOCOL_ F_ CONFIG, we need to add this feature here, and we also need 
the vdpa driver to support VHOST_ USER_ PROTOCOL_ F_ CONFIG in rte_ 
vdpa_ dev_ ops's get_ features,  only add this in vendor's vdpa driver 
is invalid.

Thanks.

>> Signed-off-by: Hao Chen <chenh@yusur.tech>
>> ---
>>   lib/vhost/vhost_user.h | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h
>> index 8ecca68597..12e8d116f3 100644
>> --- a/lib/vhost/vhost_user.h
>> +++ b/lib/vhost/vhost_user.h
>> @@ -23,7 +23,8 @@
>>   					 (1ULL <<
>> VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) | \
>>   					 (1ULL <<
>> VHOST_USER_PROTOCOL_F_HOST_NOTIFIER) | \
>>   					 (1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT) |
>> \
>> -					 (1ULL << VHOST_USER_PROTOCOL_F_STATUS))
>> +					 (1ULL << VHOST_USER_PROTOCOL_F_STATUS) | \
>> +					 (1ULL << VHOST_USER_PROTOCOL_F_CONFIG))
>>
>>   typedef enum VhostUserRequest {
>>   	VHOST_USER_NONE = 0,
>> --
>> 2.34.1