diff mbox

[dpdk-dev,v3,09/15] net/sfc: use new rte_eth_linkstatus functions

Message ID 20180108174514.14688-10-stephen@networkplumber.org (mailing list archive)
State Superseded, archived
Delegated to: Ferruh Yigit
Headers

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail Compilation issues

Commit Message

Stephen Hemminger Jan. 8, 2018, 5:45 p.m. UTC 
  Use the new API (_rte_eth_linkstatus_set) to handle link status update.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/sfc/sfc_ethdev.c | 27 +++++++--------------------
 drivers/net/sfc/sfc_ev.c     | 23 ++++-------------------
 2 files changed, 11 insertions(+), 39 deletions(-)

Comments

Andrew Rybchenko Jan. 9, 2018, 10:35 a.m. UTC | #1 
On 01/08/2018 08:45 PM, Stephen Hemminger wrote:
> Use the new API (_rte_eth_linkstatus_set) to handle link status update.
>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>   drivers/net/sfc/sfc_ethdev.c | 27 +++++++--------------------
>   drivers/net/sfc/sfc_ev.c     | 23 ++++-------------------
>   2 files changed, 11 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
> index 2f5f86f84877..e0a12b32b1a3 100644
> --- a/drivers/net/sfc/sfc_ethdev.c
> +++ b/drivers/net/sfc/sfc_ethdev.c
> @@ -238,22 +238,12 @@ static int
>   sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
>   {
>   	struct sfc_adapter *sa = dev->data->dev_private;
> -	struct rte_eth_link *dev_link = &dev->data->dev_link;
> -	struct rte_eth_link old_link;
>   	struct rte_eth_link current_link;
>   
>   	sfc_log_init(sa, "entry");
>   
> -retry:
> -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
> -	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
> -
>   	if (sa->state != SFC_ADAPTER_STARTED) {
>   		sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, &current_link);
> -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> -					 *(uint64_t *)&old_link,
> -					 *(uint64_t *)&current_link))
> -			goto retry;
>   	} else if (wait_to_complete) {
>   		efx_link_mode_t link_mode;
>   
> @@ -261,21 +251,18 @@ sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
>   			link_mode = EFX_LINK_UNKNOWN;
>   		sfc_port_link_mode_to_info(link_mode, &current_link);
>   
> -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> -					 *(uint64_t *)&old_link,
> -					 *(uint64_t *)&current_link))
> -			goto retry;
>   	} else {
>   		sfc_ev_mgmt_qpoll(sa);
> -		*(int64_t *)&current_link =
> -			rte_atomic64_read((rte_atomic64_t *)dev_link);
> +		_rte_eth_linkstatus_get(dev, &current_link);
>   	}
>   
> -	if (old_link.link_status != current_link.link_status)
> -		sfc_info(sa, "Link status is %s",
> -			 current_link.link_status ? "UP" : "DOWN");
> +	if (_rte_eth_linkstatus_set(dev, &current_link) == 0)
> +		return 0;
> +
> +	sfc_info(sa, "Link status is %s",
> +		 current_link.link_status ? "UP" : "DOWN");
>   
> -	return old_link.link_status == current_link.link_status ? 0 : -1;
> +	return -1;
>   }
>   
>   static void
> diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
> index a16dc27b380e..3e96536a9d60 100644
> --- a/drivers/net/sfc/sfc_ev.c
> +++ b/drivers/net/sfc/sfc_ev.c
> @@ -404,29 +404,14 @@ sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
>   {
>   	struct sfc_evq *evq = arg;
>   	struct sfc_adapter *sa = evq->sa;
> -	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
>   	struct rte_eth_link new_link;
> -	uint64_t new_link_u64;
> -	uint64_t old_link_u64;
> -
> -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
>   
>   	sfc_port_link_mode_to_info(link_mode, &new_link);
> +	if (_rte_eth_linkstatus_set(sa->eth_dev, &new_link) == 0)
> +		return B_FALSE;
>   
> -	new_link_u64 = *(uint64_t *)&new_link;
> -	do {
> -		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
> -		if (old_link_u64 == new_link_u64)
> -			break;
> -
> -		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> -					old_link_u64, new_link_u64)) {
> -			evq->sa->port.lsc_seq++;
> -			break;
> -		}
> -	} while (B_TRUE);
> -
> -	return B_FALSE;
> +	evq->sa->port.lsc_seq++;
> +	return B_TRUE;

It still returns B_TRUE, but should return B_FALSE as before.
Also before the patch lsc_seq is incremented in the case of any
changes in link status, but now in the case of up/down change only.

>   }
>   
>   static const efx_ev_callbacks_t sfc_ev_callbacks = {
Stephen Hemminger Jan. 9, 2018, 4:27 p.m. UTC | #2 
On Tue, 9 Jan 2018 13:35:58 +0300
Andrew Rybchenko <arybchenko@solarflare.com> wrote:

> On 01/08/2018 08:45 PM, Stephen Hemminger wrote:
> > Use the new API (_rte_eth_linkstatus_set) to handle link status update.
> >
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > ---
> >   drivers/net/sfc/sfc_ethdev.c | 27 +++++++--------------------
> >   drivers/net/sfc/sfc_ev.c     | 23 ++++-------------------
> >   2 files changed, 11 insertions(+), 39 deletions(-)
> >
> > diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
> > index 2f5f86f84877..e0a12b32b1a3 100644
> > --- a/drivers/net/sfc/sfc_ethdev.c
> > +++ b/drivers/net/sfc/sfc_ethdev.c
> > @@ -238,22 +238,12 @@ static int
> >   sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> >   {
> >   	struct sfc_adapter *sa = dev->data->dev_private;
> > -	struct rte_eth_link *dev_link = &dev->data->dev_link;
> > -	struct rte_eth_link old_link;
> >   	struct rte_eth_link current_link;
> >   
> >   	sfc_log_init(sa, "entry");
> >   
> > -retry:
> > -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
> > -	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
> > -
> >   	if (sa->state != SFC_ADAPTER_STARTED) {
> >   		sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, &current_link);
> > -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> > -					 *(uint64_t *)&old_link,
> > -					 *(uint64_t *)&current_link))
> > -			goto retry;
> >   	} else if (wait_to_complete) {
> >   		efx_link_mode_t link_mode;
> >   
> > @@ -261,21 +251,18 @@ sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> >   			link_mode = EFX_LINK_UNKNOWN;
> >   		sfc_port_link_mode_to_info(link_mode, &current_link);
> >   
> > -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> > -					 *(uint64_t *)&old_link,
> > -					 *(uint64_t *)&current_link))
> > -			goto retry;
> >   	} else {
> >   		sfc_ev_mgmt_qpoll(sa);
> > -		*(int64_t *)&current_link =
> > -			rte_atomic64_read((rte_atomic64_t *)dev_link);
> > +		_rte_eth_linkstatus_get(dev, &current_link);
> >   	}
> >   
> > -	if (old_link.link_status != current_link.link_status)
> > -		sfc_info(sa, "Link status is %s",
> > -			 current_link.link_status ? "UP" : "DOWN");
> > +	if (_rte_eth_linkstatus_set(dev, &current_link) == 0)
> > +		return 0;
> > +
> > +	sfc_info(sa, "Link status is %s",
> > +		 current_link.link_status ? "UP" : "DOWN");
> >   
> > -	return old_link.link_status == current_link.link_status ? 0 : -1;
> > +	return -1;
> >   }
> >   
> >   static void
> > diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
> > index a16dc27b380e..3e96536a9d60 100644
> > --- a/drivers/net/sfc/sfc_ev.c
> > +++ b/drivers/net/sfc/sfc_ev.c
> > @@ -404,29 +404,14 @@ sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
> >   {
> >   	struct sfc_evq *evq = arg;
> >   	struct sfc_adapter *sa = evq->sa;
> > -	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
> >   	struct rte_eth_link new_link;
> > -	uint64_t new_link_u64;
> > -	uint64_t old_link_u64;
> > -
> > -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
> >   
> >   	sfc_port_link_mode_to_info(link_mode, &new_link);
> > +	if (_rte_eth_linkstatus_set(sa->eth_dev, &new_link) == 0)
> > +		return B_FALSE;
> >   
> > -	new_link_u64 = *(uint64_t *)&new_link;
> > -	do {
> > -		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
> > -		if (old_link_u64 == new_link_u64)
> > -			break;
> > -
> > -		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> > -					old_link_u64, new_link_u64)) {
> > -			evq->sa->port.lsc_seq++;
> > -			break;
> > -		}
> > -	} while (B_TRUE);
> > -
> > -	return B_FALSE;
> > +	evq->sa->port.lsc_seq++;
> > +	return B_TRUE;  
> 
> It still returns B_TRUE, but should return B_FALSE as before.
> Also before the patch lsc_seq is incremented in the case of any
> changes in link status, but now in the case of up/down change only.

The old code looked broken and did not match the comments.
It always returned B_FALSE independent of whether link status changed
or not.
Andrew Rybchenko Jan. 9, 2018, 7:29 p.m. UTC | #3 
On 01/09/2018 07:27 PM, Stephen Hemminger wrote:
> On Tue, 9 Jan 2018 13:35:58 +0300
> Andrew Rybchenko <arybchenko@solarflare.com> wrote:
>
>> On 01/08/2018 08:45 PM, Stephen Hemminger wrote:
>>> Use the new API (_rte_eth_linkstatus_set) to handle link status update.
>>>
>>> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
>>> ---
>>>    drivers/net/sfc/sfc_ethdev.c | 27 +++++++--------------------
>>>    drivers/net/sfc/sfc_ev.c     | 23 ++++-------------------
>>>    2 files changed, 11 insertions(+), 39 deletions(-)
>>>
>>> diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
>>> index 2f5f86f84877..e0a12b32b1a3 100644
>>> --- a/drivers/net/sfc/sfc_ethdev.c
>>> +++ b/drivers/net/sfc/sfc_ethdev.c
>>> @@ -238,22 +238,12 @@ static int
>>>    sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
>>>    {
>>>    	struct sfc_adapter *sa = dev->data->dev_private;
>>> -	struct rte_eth_link *dev_link = &dev->data->dev_link;
>>> -	struct rte_eth_link old_link;
>>>    	struct rte_eth_link current_link;
>>>    
>>>    	sfc_log_init(sa, "entry");
>>>    
>>> -retry:
>>> -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
>>> -	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
>>> -
>>>    	if (sa->state != SFC_ADAPTER_STARTED) {
>>>    		sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, &current_link);
>>> -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
>>> -					 *(uint64_t *)&old_link,
>>> -					 *(uint64_t *)&current_link))
>>> -			goto retry;
>>>    	} else if (wait_to_complete) {
>>>    		efx_link_mode_t link_mode;
>>>    
>>> @@ -261,21 +251,18 @@ sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
>>>    			link_mode = EFX_LINK_UNKNOWN;
>>>    		sfc_port_link_mode_to_info(link_mode, &current_link);
>>>    
>>> -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
>>> -					 *(uint64_t *)&old_link,
>>> -					 *(uint64_t *)&current_link))
>>> -			goto retry;
>>>    	} else {
>>>    		sfc_ev_mgmt_qpoll(sa);
>>> -		*(int64_t *)&current_link =
>>> -			rte_atomic64_read((rte_atomic64_t *)dev_link);
>>> +		_rte_eth_linkstatus_get(dev, &current_link);
>>>    	}
>>>    
>>> -	if (old_link.link_status != current_link.link_status)
>>> -		sfc_info(sa, "Link status is %s",
>>> -			 current_link.link_status ? "UP" : "DOWN");
>>> +	if (_rte_eth_linkstatus_set(dev, &current_link) == 0)
>>> +		return 0;
>>> +
>>> +	sfc_info(sa, "Link status is %s",
>>> +		 current_link.link_status ? "UP" : "DOWN");
>>>    
>>> -	return old_link.link_status == current_link.link_status ? 0 : -1;
>>> +	return -1;
>>>    }
>>>    
>>>    static void
>>> diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
>>> index a16dc27b380e..3e96536a9d60 100644
>>> --- a/drivers/net/sfc/sfc_ev.c
>>> +++ b/drivers/net/sfc/sfc_ev.c
>>> @@ -404,29 +404,14 @@ sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
>>>    {
>>>    	struct sfc_evq *evq = arg;
>>>    	struct sfc_adapter *sa = evq->sa;
>>> -	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
>>>    	struct rte_eth_link new_link;
>>> -	uint64_t new_link_u64;
>>> -	uint64_t old_link_u64;
>>> -
>>> -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
>>>    
>>>    	sfc_port_link_mode_to_info(link_mode, &new_link);
>>> +	if (_rte_eth_linkstatus_set(sa->eth_dev, &new_link) == 0)
>>> +		return B_FALSE;
>>>    
>>> -	new_link_u64 = *(uint64_t *)&new_link;
>>> -	do {
>>> -		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
>>> -		if (old_link_u64 == new_link_u64)
>>> -			break;
>>> -
>>> -		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
>>> -					old_link_u64, new_link_u64)) {
>>> -			evq->sa->port.lsc_seq++;
>>> -			break;
>>> -		}
>>> -	} while (B_TRUE);
>>> -
>>> -	return B_FALSE;
>>> +	evq->sa->port.lsc_seq++;
>>> +	return B_TRUE;
>> It still returns B_TRUE, but should return B_FALSE as before.
>> Also before the patch lsc_seq is incremented in the case of any
>> changes in link status, but now in the case of up/down change only.
> The old code looked broken and did not match the comments.
> It always returned B_FALSE independent of whether link status changed
> or not.

Which comments does it not match?
Yes, because it is internal callback and return value is unrelated to link
status changes. Return value affects further events processing.
If B_TRUE is returned, it means something bad has happened and
events processing should be aborted.
diff mbox

Patch

diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index 2f5f86f84877..e0a12b32b1a3 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -238,22 +238,12 @@  static int
 sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 {
 	struct sfc_adapter *sa = dev->data->dev_private;
-	struct rte_eth_link *dev_link = &dev->data->dev_link;
-	struct rte_eth_link old_link;
 	struct rte_eth_link current_link;
 
 	sfc_log_init(sa, "entry");
 
-retry:
-	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
-	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
-
 	if (sa->state != SFC_ADAPTER_STARTED) {
 		sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, &current_link);
-		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
-					 *(uint64_t *)&old_link,
-					 *(uint64_t *)&current_link))
-			goto retry;
 	} else if (wait_to_complete) {
 		efx_link_mode_t link_mode;
 
@@ -261,21 +251,18 @@  sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 			link_mode = EFX_LINK_UNKNOWN;
 		sfc_port_link_mode_to_info(link_mode, &current_link);
 
-		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
-					 *(uint64_t *)&old_link,
-					 *(uint64_t *)&current_link))
-			goto retry;
 	} else {
 		sfc_ev_mgmt_qpoll(sa);
-		*(int64_t *)&current_link =
-			rte_atomic64_read((rte_atomic64_t *)dev_link);
+		_rte_eth_linkstatus_get(dev, &current_link);
 	}
 
-	if (old_link.link_status != current_link.link_status)
-		sfc_info(sa, "Link status is %s",
-			 current_link.link_status ? "UP" : "DOWN");
+	if (_rte_eth_linkstatus_set(dev, &current_link) == 0)
+		return 0;
+
+	sfc_info(sa, "Link status is %s",
+		 current_link.link_status ? "UP" : "DOWN");
 
-	return old_link.link_status == current_link.link_status ? 0 : -1;
+	return -1;
 }
 
 static void
diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
index a16dc27b380e..3e96536a9d60 100644
--- a/drivers/net/sfc/sfc_ev.c
+++ b/drivers/net/sfc/sfc_ev.c
@@ -404,29 +404,14 @@  sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
 {
 	struct sfc_evq *evq = arg;
 	struct sfc_adapter *sa = evq->sa;
-	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
 	struct rte_eth_link new_link;
-	uint64_t new_link_u64;
-	uint64_t old_link_u64;
-
-	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
 
 	sfc_port_link_mode_to_info(link_mode, &new_link);
+	if (_rte_eth_linkstatus_set(sa->eth_dev, &new_link) == 0)
+		return B_FALSE;
 
-	new_link_u64 = *(uint64_t *)&new_link;
-	do {
-		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
-		if (old_link_u64 == new_link_u64)
-			break;
-
-		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
-					old_link_u64, new_link_u64)) {
-			evq->sa->port.lsc_seq++;
-			break;
-		}
-	} while (B_TRUE);
-
-	return B_FALSE;
+	evq->sa->port.lsc_seq++;
+	return B_TRUE;
 }
 
 static const efx_ev_callbacks_t sfc_ev_callbacks = {