> -----Original Message-----
> From: Richardson, Bruce
> Sent: Friday, May 06, 2016 11:14 PM
> To: Wu, Jingjing
> Cc: Zhang, Helin; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] i40evf: fix return value if command fails
>
> On Thu, May 05, 2016 at 02:22:54PM +0800, Jingjing Wu wrote:
> > Previously, if message is sent successfully, but no response is
> > received, function "i40evf_execute_vf_cmd" will return without error.
> > The root cause is value "err" is overwritten. This patch fixes it.
> >
> > Fixes: ae19955e7c86 ("i40evf: support reporting PF reset")
> > Signed-off-by: Jingjing Wu <jingjing.wu at intel.com>
> > ---
> > drivers/net/i40e/i40e_ethdev_vf.c | 8 +++-----
> > 1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/i40e/i40e_ethdev_vf.c
> > b/drivers/net/i40e/i40e_ethdev_vf.c
> > index 2bce69b..9380019 100644
> > --- a/drivers/net/i40e/i40e_ethdev_vf.c
> > +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> > @@ -327,8 +327,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev,
> struct vf_cmd_info *args)
> > struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);
> > struct i40evf_arq_msg_info info;
> > enum i40evf_aq_result ret;
> > - int err = -1;
> > - int i = 0;
> > + int err, i = 0;
> >
> > if (_atomic_set_cmd(vf, args->ops))
> > return -1;
> > @@ -346,6 +345,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev,
> struct vf_cmd_info *args)
> > return err;
> > }
> >
> > + err = -1;
> > switch (args->ops) {
> > case I40E_VIRTCHNL_OP_RESET_VF:
> > /*no need to process in this function */
>
> Hi Jingjing,
>
> this patch changes this return value in this case
> (I40E_VIRTCHNL_OP_RESET_VF).
> Is this intentional - if so it probably needs to be documented in the commit
> message. If not, the "err = -1" should be put at the start of the do { } while
> loop for the GET_VF_RESOURCES command.
>
> Perhaps to avoid future errors, each case in the switch should explicitly set
> it's own default error value?
>
Yes, you reminded me the case I40E_VIRTCHNL_OP_RESET_VF. Let me rework this.
Thanks
Jingjing
> /Bruce
