[dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[Wei Zhao]

In i40e FDIR PMD code for checking programming status
function i40e_check_fdir_programming_status(), the initial value
of return value ret should be set to -1 not 0, because if DD bit of
I40E_RX_DESC_STATUS_DD is not write back, this function will return
0 to upper function, this give an error info to upper function, the
fact for this is it is time out for DD write back and it should return
-1.

Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
---
 drivers/net/i40e/i40e_fdir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index d41601a..b958bf6 100644
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -1315,7 +1315,7 @@ i40e_check_fdir_programming_status(struct i40e_rx_queue *rxq)
 	uint32_t rx_status;
 	uint32_t len, id;
 	uint32_t error;
-	int ret = 0;
+	int ret = -1;
 
 	rxdp = &rxq->rx_ring[rxq->rx_tail];
 	qword1 = rte_le_to_cpu_64(rxdp->wb.qword1.status_error_len);
@@ -1360,6 +1360,7 @@ i40e_check_fdir_programming_status(struct i40e_rx_queue *rxq)
 			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1);
 		else
 			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
+		ret = 0;
 	}
 
 	return ret;
-- 
2.7.5

Re: [dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[Zhang, Qi Z]

> -----Original Message-----
> From: Zhao1, Wei
> Sent: Wednesday, July 11, 2018 4:25 PM
> To: dev@dpdk.org
> Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org; Zhao1, Wei
> <wei.zhao1@intel.com>
> Subject: [PATCH] net/i40e: fix FDIR check programming status error
> 
> In i40e FDIR PMD code for checking programming status function
> i40e_check_fdir_programming_status(), the initial value of return value ret
> should be set to -1 not 0, because if DD bit of I40E_RX_DESC_STATUS_DD is not
> write back, this function will return
> 0 to upper function, this give an error info to upper function, the fact for this is
> it is time out for DD write back and it should return -1.
> 
> Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
> Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
> ---
>  drivers/net/i40e/i40e_fdir.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c index
> d41601a..b958bf6 100644
> --- a/drivers/net/i40e/i40e_fdir.c
> +++ b/drivers/net/i40e/i40e_fdir.c
> @@ -1315,7 +1315,7 @@ i40e_check_fdir_programming_status(struct
> i40e_rx_queue *rxq)
>  	uint32_t rx_status;
>  	uint32_t len, id;
>  	uint32_t error;
> -	int ret = 0;
> +	int ret = -1;
> 
>  	rxdp = &rxq->rx_ring[rxq->rx_tail];
>  	qword1 = rte_le_to_cpu_64(rxdp->wb.qword1.status_error_len);
> @@ -1360,6 +1360,7 @@ i40e_check_fdir_programming_status(struct
> i40e_rx_queue *rxq)
>  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1);
>  		else
>  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
> +		ret = 0;

Is it possible to overwrite previous ret = -1 which is not what we want?

I would prefer

int ret = 0;

If (dd bit is set) {
	If xxx
		Ret = -1;
	If xxx 
		Ret = -1;
} else {
	ret = -1;
}

return ret;

>  	}
> 
>  	return ret;
> --
> 2.7.5

Re: [dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[Zhao1, Wei]

This  code change is ok also, but it seems need to add more Judging branch?
IF you think it is almost the same, I WILL commit a new v2.


> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Friday, July 13, 2018 11:06 AM
> To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org
> Subject: RE: [PATCH] net/i40e: fix FDIR check programming status error
> 
> 
> 
> > -----Original Message-----
> > From: Zhao1, Wei
> > Sent: Wednesday, July 11, 2018 4:25 PM
> > To: dev@dpdk.org
> > Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org; Zhao1, Wei
> > <wei.zhao1@intel.com>
> > Subject: [PATCH] net/i40e: fix FDIR check programming status error
> >
> > In i40e FDIR PMD code for checking programming status function
> > i40e_check_fdir_programming_status(), the initial value of return
> > value ret should be set to -1 not 0, because if DD bit of
> > I40E_RX_DESC_STATUS_DD is not write back, this function will return
> > 0 to upper function, this give an error info to upper function, the
> > fact for this is it is time out for DD write back and it should return -1.
> >
> > Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
> > Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
> > ---
> >  drivers/net/i40e/i40e_fdir.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/i40e/i40e_fdir.c
> > b/drivers/net/i40e/i40e_fdir.c index
> > d41601a..b958bf6 100644
> > --- a/drivers/net/i40e/i40e_fdir.c
> > +++ b/drivers/net/i40e/i40e_fdir.c
> > @@ -1315,7 +1315,7 @@ i40e_check_fdir_programming_status(struct
> > i40e_rx_queue *rxq)
> >  	uint32_t rx_status;
> >  	uint32_t len, id;
> >  	uint32_t error;
> > -	int ret = 0;
> > +	int ret = -1;
> >
> >  	rxdp = &rxq->rx_ring[rxq->rx_tail];
> >  	qword1 = rte_le_to_cpu_64(rxdp->wb.qword1.status_error_len);
> > @@ -1360,6 +1360,7 @@ i40e_check_fdir_programming_status(struct
> > i40e_rx_queue *rxq)
> >  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq-
> >nb_rx_desc - 1);
> >  		else
> >  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
> > +		ret = 0;
> 
> Is it possible to overwrite previous ret = -1 which is not what we want?
> 
> I would prefer
> 
> int ret = 0;
> 
> If (dd bit is set) {
> 	If xxx
> 		Ret = -1;
> 	If xxx
> 		Ret = -1;
> } else {
> 	ret = -1;
> }
> 
> return ret;
> 
> >  	}
> >
> >  	return ret;
> > --
> > 2.7.5

Re: [dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[Zhang, Qi Z]

> -----Original Message-----
> From: Zhao1, Wei
> Sent: Friday, July 13, 2018 11:12 AM
> To: Zhang, Qi Z <qi.z.zhang@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org
> Subject: RE: [PATCH] net/i40e: fix FDIR check programming status error
> 
> This  code change is ok also, 

I don't think so, with your change, it will always return 0 if DD bit is set, 
but we still need to return -1 if there is any error in descriptor, right?

but it seems need to add more Judging branch?
> IF you think it is almost the same, I WILL commit a new v2.
> 
> 
> > -----Original Message-----
> > From: Zhang, Qi Z
> > Sent: Friday, July 13, 2018 11:06 AM
> > To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> > Cc: stable@dpdk.org
> > Subject: RE: [PATCH] net/i40e: fix FDIR check programming status error
> >
> >
> >
> > > -----Original Message-----
> > > From: Zhao1, Wei
> > > Sent: Wednesday, July 11, 2018 4:25 PM
> > > To: dev@dpdk.org
> > > Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org; Zhao1, Wei
> > > <wei.zhao1@intel.com>
> > > Subject: [PATCH] net/i40e: fix FDIR check programming status error
> > >
> > > In i40e FDIR PMD code for checking programming status function
> > > i40e_check_fdir_programming_status(), the initial value of return
> > > value ret should be set to -1 not 0, because if DD bit of
> > > I40E_RX_DESC_STATUS_DD is not write back, this function will return
> > > 0 to upper function, this give an error info to upper function, the
> > > fact for this is it is time out for DD write back and it should return -1.
> > >
> > > Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
> > > Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
> > > ---
> > >  drivers/net/i40e/i40e_fdir.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/net/i40e/i40e_fdir.c
> > > b/drivers/net/i40e/i40e_fdir.c index
> > > d41601a..b958bf6 100644
> > > --- a/drivers/net/i40e/i40e_fdir.c
> > > +++ b/drivers/net/i40e/i40e_fdir.c
> > > @@ -1315,7 +1315,7 @@ i40e_check_fdir_programming_status(struct
> > > i40e_rx_queue *rxq)
> > >  	uint32_t rx_status;
> > >  	uint32_t len, id;
> > >  	uint32_t error;
> > > -	int ret = 0;
> > > +	int ret = -1;
> > >
> > >  	rxdp = &rxq->rx_ring[rxq->rx_tail];
> > >  	qword1 = rte_le_to_cpu_64(rxdp->wb.qword1.status_error_len);
> > > @@ -1360,6 +1360,7 @@ i40e_check_fdir_programming_status(struct
> > > i40e_rx_queue *rxq)
> > >  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq- nb_rx_desc - 1);
> > >  		else
> > >  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
> > > +		ret = 0;
> >
> > Is it possible to overwrite previous ret = -1 which is not what we want?
> >
> > I would prefer
> >
> > int ret = 0;
> >
> > If (dd bit is set) {
> > 	If xxx
> > 		Ret = -1;
> > 	If xxx
> > 		Ret = -1;
> > } else {
> > 	ret = -1;
> > }
> >
> > return ret;
> >
> > >  	}
> > >
> > >  	return ret;
> > > --
> > > 2.7.5

Re: [dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[Zhao1, Wei]

> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Friday, July 13, 2018 11:16 AM
> To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org
> Subject: RE: [PATCH] net/i40e: fix FDIR check programming status error
> 
> 
> 
> > -----Original Message-----
> > From: Zhao1, Wei
> > Sent: Friday, July 13, 2018 11:12 AM
> > To: Zhang, Qi Z <qi.z.zhang@intel.com>; dev@dpdk.org
> > Cc: stable@dpdk.org
> > Subject: RE: [PATCH] net/i40e: fix FDIR check programming status error
> >
> > This  code change is ok also,
> 
> I don't think so, with your change, it will always return 0 if DD bit is set, but
> we still need to return -1 if there is any error in descriptor, right?

Yes, you are right!
I will commit v2!!
I find  a bug but give out an error fix patch, orz....

> 
> but it seems need to add more Judging branch?
> > IF you think it is almost the same, I WILL commit a new v2.
> >
> >
> > > -----Original Message-----
> > > From: Zhang, Qi Z
> > > Sent: Friday, July 13, 2018 11:06 AM
> > > To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> > > Cc: stable@dpdk.org
> > > Subject: RE: [PATCH] net/i40e: fix FDIR check programming status
> > > error
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: Zhao1, Wei
> > > > Sent: Wednesday, July 11, 2018 4:25 PM
> > > > To: dev@dpdk.org
> > > > Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org; Zhao1,
> > > > Wei <wei.zhao1@intel.com>
> > > > Subject: [PATCH] net/i40e: fix FDIR check programming status error
> > > >
> > > > In i40e FDIR PMD code for checking programming status function
> > > > i40e_check_fdir_programming_status(), the initial value of return
> > > > value ret should be set to -1 not 0, because if DD bit of
> > > > I40E_RX_DESC_STATUS_DD is not write back, this function will
> > > > return
> > > > 0 to upper function, this give an error info to upper function,
> > > > the fact for this is it is time out for DD write back and it should return -1.
> > > >
> > > > Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
> > > > Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
> > > > ---
> > > >  drivers/net/i40e/i40e_fdir.c | 3 ++-
> > > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/net/i40e/i40e_fdir.c
> > > > b/drivers/net/i40e/i40e_fdir.c index
> > > > d41601a..b958bf6 100644
> > > > --- a/drivers/net/i40e/i40e_fdir.c
> > > > +++ b/drivers/net/i40e/i40e_fdir.c
> > > > @@ -1315,7 +1315,7 @@ i40e_check_fdir_programming_status(struct
> > > > i40e_rx_queue *rxq)
> > > >  	uint32_t rx_status;
> > > >  	uint32_t len, id;
> > > >  	uint32_t error;
> > > > -	int ret = 0;
> > > > +	int ret = -1;
> > > >
> > > >  	rxdp = &rxq->rx_ring[rxq->rx_tail];
> > > >  	qword1 = rte_le_to_cpu_64(rxdp->wb.qword1.status_error_len);
> > > > @@ -1360,6 +1360,7 @@ i40e_check_fdir_programming_status(struct
> > > > i40e_rx_queue *rxq)
> > > >  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq- nb_rx_desc
> - 1);
> > > >  		else
> > > >  			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
> > > > +		ret = 0;
> > >
> > > Is it possible to overwrite previous ret = -1 which is not what we want?
> > >
> > > I would prefer
> > >
> > > int ret = 0;
> > >
> > > If (dd bit is set) {
> > > 	If xxx
> > > 		Ret = -1;
> > > 	If xxx
> > > 		Ret = -1;
> > > } else {
> > > 	ret = -1;
> > > }
> > >
> > > return ret;
> > >
> > > >  	}
> > > >
> > > >  	return ret;
> > > > --
> > > > 2.7.5

[dpdk-dev] [PATCH v2] net/i40e: fix FDIR check programming status error

[Zhao Wei]

In i40e FDIR PMD code for checking programming status
function i40e_check_fdir_programming_status(), the initial value
of return value ret should be set to -1 not 0, because if DD bit of
I40E_RX_DESC_STATUS_DD is not write back, this function will return
0 to upper function, this give an error info to upper function, the
fact for this is it is time out for DD write back and it should return
-1.

Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>

---

v2:
-fix patch error in ret value set.
---
 drivers/net/i40e/i40e_fdir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index d41601a..a4c8722 100644
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -1360,7 +1360,8 @@ i40e_check_fdir_programming_status(struct i40e_rx_queue *rxq)
 			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1);
 		else
 			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
-	}
+	} else
+		ret = -1;
 
 	return ret;
 }
-- 
2.7.5

[dpdk-dev] [PATCH v3] net/i40e: fix FDIR check programming status error

[Zhao Wei]

In i40e FDIR PMD code for checking programming status
function i40e_check_fdir_programming_status(), the initial value
of return value ret should be set to -1 not 0, because if DD bit of
I40E_RX_DESC_STATUS_DD is not write back, this function will return
0 to upper function, this give an error info to upper function, the
fact for this is it is time out for DD write back and it should return
-1.

Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>

---

v2:
-fix patch error in ret value set.

v3:
-fix patch check warning.
---
 drivers/net/i40e/i40e_fdir.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index d41601a..2b299c7 100644
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -1360,6 +1360,8 @@ i40e_check_fdir_programming_status(struct i40e_rx_queue *rxq)
 			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1);
 		else
 			I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
+	} else {
+		ret = -1;
 	}
 
 	return ret;
-- 
2.7.5

Re: [dpdk-dev] [PATCH v3] net/i40e: fix FDIR check programming status error

[Zhang, Qi Z]

> -----Original Message-----
> From: Zhao1, Wei
> Sent: Friday, July 13, 2018 11:17 AM
> To: dev@dpdk.org
> Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; stable@dpdk.org; Zhao1, Wei
> <wei.zhao1@intel.com>
> Subject: [PATCH v3] net/i40e: fix FDIR check programming status error
> 
> In i40e FDIR PMD code for checking programming status function
> i40e_check_fdir_programming_status(), the initial value of return value ret
> should be set to -1 not 0, because if DD bit of I40E_RX_DESC_STATUS_DD is not
> write back, this function will return
> 0 to upper function, this give an error info to upper function, the fact for this is
> it is time out for DD write back and it should return -1.
> 
> Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
> Signed-off-by: Wei Zhao <wei.zhao1@intel.com>

Acked-by: Qi Zhang <qi.z.zhang@intel.com>

Applied to dpdk-next-net-intel.

Thanks!
Qi