[dpdk-dev] [PATCH v2] vhost: workaround MQ fails to startup

[Maxime Coquelin]

On 04/27/2017 11:41 AM, Zhiyong Yang wrote:
>    vhost since dpdk17.02 + qemu2.7 and above will cause failures of
> new connection when negotiating to set MQ. (one queue pair works
> well).
>     Because there exist some bugs in qemu code when introducing
> VHOST_USER_PROTOCOL_F_REPLY_ACK to qemu. when dealing with the vhost
> message VHOST_USER_SET_MEM_TABLE for the second time, qemu indeed
> doesn't send the messge (The message needs to be sent only once)but
> still will be waiting for dpdk's reply ack, then, qemu is always
> freezing. DPDK code indeed works in the right way.
>     The feature VHOST_USER_PROTOCOL_F_REPLY_ACK has to be disabled
> by default at the dpdk side in order to avoid the feature support of
> DPDK + qemu at the same time. if doing like that, MQ can works well.
> 
> Cc: stable at dpdk.org
> 
> Reported-by: Ciara Loftus <ciara.loftus at intel.com>
> Signed-off-by: Zhiyong Yang <zhiyong.yang at intel.com>
> Tested-by: Ciara Loftus <ciara.loftus at intel.com>
> ---
> 
> changes in V2
> 1. modify "workaround" instead of "fix" in the title.
> 2. add a simple comment suggested by yuanhan
> 
>   lib/librte_vhost/vhost_user.h | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime