Re: [PATCH v2] net/ifc: do not notify before HW ready

[Ye Xiaolong <xiaolong.ye@intel.com>]

Looks good to me.

Reviewed-by: Ye Xiaolong <xiaolong.ye@intel.com>

Thanks,
Xiaolong

On 09/14, Xiao Wang wrote:
>If the device is not clearly reset by the previous driver and holds
>some invalid ring addr, and the relay thread kicks it before HW is
>properly re-configured, a bad DMA request may happen.
>
>Besides, the notify_addr which is used by the relay thread is set in
>the vdpa_ifcvf_start function, if a kick relay happens before
>vdpa_ifcvf_start finishes, a null addr is accessed.
>
>Fixes: a3f8150eac6d ("net/ifcvf: add ifcvf vDPA driver")
>
>Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
>---
>v2:
>* Add description for the fix in the commit log.
>---
> drivers/net/ifc/ifcvf_vdpa.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c
>index 3c5430dc0..7d3085d8d 100644
>--- a/drivers/net/ifc/ifcvf_vdpa.c
>+++ b/drivers/net/ifc/ifcvf_vdpa.c
>@@ -503,11 +503,11 @@ update_datapath(struct ifcvf_internal *internal)
> 		if (ret)
> 			goto err;
> 
>-		ret = setup_notify_relay(internal);
>+		ret = vdpa_ifcvf_start(internal);
> 		if (ret)
> 			goto err;
> 
>-		ret = vdpa_ifcvf_start(internal);
>+		ret = setup_notify_relay(internal);
> 		if (ret)
> 			goto err;
> 
>@@ -515,12 +515,12 @@ update_datapath(struct ifcvf_internal *internal)
> 	} else if (rte_atomic32_read(&internal->running) &&
> 		   (!rte_atomic32_read(&internal->started) ||
> 		    !rte_atomic32_read(&internal->dev_attached))) {
>-		vdpa_ifcvf_stop(internal);
>-
> 		ret = unset_notify_relay(internal);
> 		if (ret)
> 			goto err;
> 
>+		vdpa_ifcvf_stop(internal);
>+
> 		ret = vdpa_disable_vfio_intr(internal);
> 		if (ret)
> 			goto err;
>-- 
>2.15.1
>