[dpdk-dev] [PATCH v5 0/3]This series adds the missing flow for enabling the LRO in the ethdev and

[dpdk-dev] [PATCH v5 0/3]This series adds the missing flow for enabling the LRO in the ethdev and

[Vlad Zolotarov]

The series starts with some cleanup work in the code the final patch (the actual adding of
the LRO support) is going to touch/use/change. There are still quite a few issues in the ixgbe
PMD code left but they have to be a matter of a different series and I've left a few "TODO"
remarks in the code.
 
The LRO ("RSC" in Intel's context) PMD completion handling code follows the same design as the
corresponding Linux and FreeBSD implementation: pass the aggregation's cluster HEAD buffer to
the NEXTP entry of the software ring till EOP is met.
 
HW configuration follows the corresponding specs: this feature is supported only by x540 and
82599 PF devices.
 
The feature has been tested with seastar TCP stack with the following configuration on Tx side:
   - MTU: 400B
   - 100 concurrent TCP connections.
 
The results were:
   - Without LRO: total throughput: 0.12Gbps, coefficient of variance: 1.41%
   - With LRO:    total throughput: 8.21Gbps, coefficient of variance: 0.59%
 
This is an almost factor 80 improvement.

New in v5:
   - Split the series into "bug fixes" and "all the rest" so that the former could be
     integrated into a 2.0 release.
   - Put the RTE_ETHDEV_HAS_LRO_SUPPORT definition at the beginning of rte_ethdev.h.
   - Removed the "TODO: Remove me" comment near RTE_ETHDEV_HAS_LRO_SUPPORT.

New in v4:
   - Remove CONFIG_RTE_ETHDEV_LRO_SUPPORT from config/common_linuxapp.
   - Define RTE_ETHDEV_HAS_LRO_SUPPORT in rte_ethdev.h.
   - As a result of "ixgbe: check rxd number to avoid mbuf leak" (352078e8e) Vector Rx
     had to get the same treatment as Rx Bulk Alloc (see PATCH4 for more details).
     
New in v3:
   - ixgbe_rx_alloc_bufs(): Always reset refcnt of the buffers to 1. Otherwise rte_pktmbuf_free()
     won't free them.

New in v2:
   - Removed rte_eth_dev_data.lro_bulk_alloc and added ixgbe_hw.rx_bulk_alloc_allowed
     instead.
   - Unified the rx_pkt_bulk callback setting (a separate new patch).
   - Fixed a few styling and spelling issues.


Vlad Zolotarov (3):
  ixgbe: Cleanups
  ixgbe: Code refactoring
  ixgbe: Add LRO support

 lib/librte_ether/rte_ethdev.h       |   9 +-
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c |   6 +
 lib/librte_pmd_ixgbe/ixgbe_ethdev.h |   5 +
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c   | 703 ++++++++++++++++++++++++++++++++----
 lib/librte_pmd_ixgbe/ixgbe_rxtx.h   |   6 +
 5 files changed, 662 insertions(+), 67 deletions(-)

-- 
2.1.0

[dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vlad Zolotarov]

   - Removed the not needed casting.
   - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
                          &dev->data->dev_conf.rxmode.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
---
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
index 72c65df..609b5fd 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
@@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
 	int diag, i;
 
 	/* allocate buffers in bulk directly into the S/W ring */
-	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
-				(rxq->rx_free_thresh - 1));
+	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
 	rxep = &rxq->sw_ring[alloc_idx];
 	diag = rte_mempool_get_bulk(rxq->mb_pool, (void *)rxep,
 				    rxq->rx_free_thresh);
@@ -1061,10 +1060,9 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
 	IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rxq->rx_free_trigger);
 
 	/* update state of internal queue structure */
-	rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_trigger +
-						rxq->rx_free_thresh);
+	rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
 	if (rxq->rx_free_trigger >= rxq->nb_rx_desc)
-		rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_thresh - 1);
+		rxq->rx_free_trigger = rxq->rx_free_thresh - 1;
 
 	/* no errors */
 	return 0;
@@ -3560,6 +3558,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	uint32_t rxcsum;
 	uint16_t buf_size;
 	uint16_t i;
+	struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
 
 	PMD_INIT_FUNC_TRACE();
 	hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
@@ -3582,7 +3581,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	 * Configure CRC stripping, if any.
 	 */
 	hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
-	if (dev->data->dev_conf.rxmode.hw_strip_crc)
+	if (rx_conf->hw_strip_crc)
 		hlreg0 |= IXGBE_HLREG0_RXCRCSTRP;
 	else
 		hlreg0 &= ~IXGBE_HLREG0_RXCRCSTRP;
@@ -3590,11 +3589,11 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	/*
 	 * Configure jumbo frame support, if any.
 	 */
-	if (dev->data->dev_conf.rxmode.jumbo_frame == 1) {
+	if (rx_conf->jumbo_frame == 1) {
 		hlreg0 |= IXGBE_HLREG0_JUMBOEN;
 		maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
 		maxfrs &= 0x0000FFFF;
-		maxfrs |= (dev->data->dev_conf.rxmode.max_rx_pkt_len << 16);
+		maxfrs |= (rx_conf->max_rx_pkt_len << 16);
 		IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, maxfrs);
 	} else
 		hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;
@@ -3618,9 +3617,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 		 * Reset crc_len in case it was changed after queue setup by a
 		 * call to configure.
 		 */
-		rxq->crc_len = (uint8_t)
-				((dev->data->dev_conf.rxmode.hw_strip_crc) ? 0 :
-				ETHER_CRC_LEN);
+		rxq->crc_len = rx_conf->hw_strip_crc ? 0 : ETHER_CRC_LEN;
 
 		/* Setup the Base and Length of the Rx Descriptor Rings */
 		bus_addr = rxq->rx_ring_phys_addr;
@@ -3638,7 +3635,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 		/*
 		 * Configure Header Split
 		 */
-		if (dev->data->dev_conf.rxmode.header_split) {
+		if (rx_conf->header_split) {
 			if (hw->mac.type == ixgbe_mac_82599EB) {
 				/* Must setup the PSRTYPE register */
 				uint32_t psrtype;
@@ -3648,7 +3645,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 					IXGBE_PSRTYPE_IPV6HDR;
 				IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx), psrtype);
 			}
-			srrctl = ((dev->data->dev_conf.rxmode.split_hdr_size <<
+			srrctl = ((rx_conf->split_hdr_size <<
 				IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
 				IXGBE_SRRCTL_BSIZEHDR_MASK);
 			srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
@@ -3699,7 +3696,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	 */
 	rxcsum = IXGBE_READ_REG(hw, IXGBE_RXCSUM);
 	rxcsum |= IXGBE_RXCSUM_PCSD;
-	if (dev->data->dev_conf.rxmode.hw_ip_checksum)
+	if (rx_conf->hw_ip_checksum)
 		rxcsum |= IXGBE_RXCSUM_IPPCSE;
 	else
 		rxcsum &= ~IXGBE_RXCSUM_IPPCSE;
@@ -3709,7 +3706,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	if (hw->mac.type == ixgbe_mac_82599EB ||
 	    hw->mac.type == ixgbe_mac_X540) {
 		rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
-		if (dev->data->dev_conf.rxmode.hw_strip_crc)
+		if (rx_conf->hw_strip_crc)
 			rdrxctl |= IXGBE_RDRXCTL_CRCSTRIP;
 		else
 			rdrxctl &= ~IXGBE_RDRXCTL_CRCSTRIP;
-- 
2.1.0

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Ananyev, Konstantin]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
> Sent: Monday, March 09, 2015 10:21 AM
> To: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> 
>    - Removed the not needed casting.
>    - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
>                           &dev->data->dev_conf.rxmode.
> 
> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
> ---
>  lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
>  1 file changed, 12 insertions(+), 15 deletions(-)
> 
> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> index 72c65df..609b5fd 100644
> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
>  	int diag, i;
> 
>  	/* allocate buffers in bulk directly into the S/W ring */
> -	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
> -				(rxq->rx_free_thresh - 1));
> +	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);

I think all these extra casts came in to keep icc 12.* compiling without warnings.
I am agree that they are unnecessary.
Though if we still have to support icc 12.* we either need to keep them, or find
some other way to keep it happy.
Konstantin  

>  	rxep = &rxq->sw_ring[alloc_idx];
>  	diag = rte_mempool_get_bulk(rxq->mb_pool, (void *)rxep,
>  				    rxq->rx_free_thresh);
> @@ -1061,10 +1060,9 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
>  	IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rxq->rx_free_trigger);
> 
>  	/* update state of internal queue structure */
> -	rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_trigger +
> -						rxq->rx_free_thresh);
> +	rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
>  	if (rxq->rx_free_trigger >= rxq->nb_rx_desc)
> -		rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_thresh - 1);
> +		rxq->rx_free_trigger = rxq->rx_free_thresh - 1;
> 
>  	/* no errors */
>  	return 0;
> @@ -3560,6 +3558,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  	uint32_t rxcsum;
>  	uint16_t buf_size;
>  	uint16_t i;
> +	struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
> 
>  	PMD_INIT_FUNC_TRACE();
>  	hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> @@ -3582,7 +3581,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  	 * Configure CRC stripping, if any.
>  	 */
>  	hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
> -	if (dev->data->dev_conf.rxmode.hw_strip_crc)
> +	if (rx_conf->hw_strip_crc)
>  		hlreg0 |= IXGBE_HLREG0_RXCRCSTRP;
>  	else
>  		hlreg0 &= ~IXGBE_HLREG0_RXCRCSTRP;
> @@ -3590,11 +3589,11 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  	/*
>  	 * Configure jumbo frame support, if any.
>  	 */
> -	if (dev->data->dev_conf.rxmode.jumbo_frame == 1) {
> +	if (rx_conf->jumbo_frame == 1) {
>  		hlreg0 |= IXGBE_HLREG0_JUMBOEN;
>  		maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
>  		maxfrs &= 0x0000FFFF;
> -		maxfrs |= (dev->data->dev_conf.rxmode.max_rx_pkt_len << 16);
> +		maxfrs |= (rx_conf->max_rx_pkt_len << 16);
>  		IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, maxfrs);
>  	} else
>  		hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;
> @@ -3618,9 +3617,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  		 * Reset crc_len in case it was changed after queue setup by a
>  		 * call to configure.
>  		 */
> -		rxq->crc_len = (uint8_t)
> -				((dev->data->dev_conf.rxmode.hw_strip_crc) ? 0 :
> -				ETHER_CRC_LEN);
> +		rxq->crc_len = rx_conf->hw_strip_crc ? 0 : ETHER_CRC_LEN;
> 
>  		/* Setup the Base and Length of the Rx Descriptor Rings */
>  		bus_addr = rxq->rx_ring_phys_addr;
> @@ -3638,7 +3635,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  		/*
>  		 * Configure Header Split
>  		 */
> -		if (dev->data->dev_conf.rxmode.header_split) {
> +		if (rx_conf->header_split) {
>  			if (hw->mac.type == ixgbe_mac_82599EB) {
>  				/* Must setup the PSRTYPE register */
>  				uint32_t psrtype;
> @@ -3648,7 +3645,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  					IXGBE_PSRTYPE_IPV6HDR;
>  				IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx), psrtype);
>  			}
> -			srrctl = ((dev->data->dev_conf.rxmode.split_hdr_size <<
> +			srrctl = ((rx_conf->split_hdr_size <<
>  				IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
>  				IXGBE_SRRCTL_BSIZEHDR_MASK);
>  			srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
> @@ -3699,7 +3696,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  	 */
>  	rxcsum = IXGBE_READ_REG(hw, IXGBE_RXCSUM);
>  	rxcsum |= IXGBE_RXCSUM_PCSD;
> -	if (dev->data->dev_conf.rxmode.hw_ip_checksum)
> +	if (rx_conf->hw_ip_checksum)
>  		rxcsum |= IXGBE_RXCSUM_IPPCSE;
>  	else
>  		rxcsum &= ~IXGBE_RXCSUM_IPPCSE;
> @@ -3709,7 +3706,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>  	if (hw->mac.type == ixgbe_mac_82599EB ||
>  	    hw->mac.type == ixgbe_mac_X540) {
>  		rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
> -		if (dev->data->dev_conf.rxmode.hw_strip_crc)
> +		if (rx_conf->hw_strip_crc)
>  			rdrxctl |= IXGBE_RDRXCTL_CRCSTRIP;
>  		else
>  			rdrxctl &= ~IXGBE_RDRXCTL_CRCSTRIP;
> --
> 2.1.0

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Pawel Wodkowski]

On 2015-03-09 11:49, Ananyev, Konstantin wrote:
>
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
>> Sent: Monday, March 09, 2015 10:21 AM
>> To: dev@dpdk.org
>> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
>>
>>     - Removed the not needed casting.
>>     - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
>>                            &dev->data->dev_conf.rxmode.
>>
>> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
>> ---
>>   lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
>>   1 file changed, 12 insertions(+), 15 deletions(-)
>>
>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>> index 72c65df..609b5fd 100644
>> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
>>   	int diag, i;
>>
>>   	/* allocate buffers in bulk directly into the S/W ring */
>> -	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
>> -				(rxq->rx_free_thresh - 1));
>> +	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
>
> I think all these extra casts came in to keep icc 12.* compiling without warnings.
> I am agree that they are unnecessary.
> Though if we still have to support icc 12.* we either need to keep them, or find
> some other way to keep it happy.
> Konstantin
>

What warnings icc 12.* is throwing? Only warning I can think of here is 
signed -> unsigned implicit cast. Changing '1' to '1U' helps?


-- 
Pawel

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Ananyev, Konstantin]

> -----Original Message-----
> From: Wodkowski, PawelX
> Sent: Monday, March 09, 2015 11:09 AM
> To: Ananyev, Konstantin; Vlad Zolotarov; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> 
> On 2015-03-09 11:49, Ananyev, Konstantin wrote:
> >
> >
> >> -----Original Message-----
> >> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
> >> Sent: Monday, March 09, 2015 10:21 AM
> >> To: dev@dpdk.org
> >> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >>
> >>     - Removed the not needed casting.
> >>     - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
> >>                            &dev->data->dev_conf.rxmode.
> >>
> >> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
> >> ---
> >>   lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
> >>   1 file changed, 12 insertions(+), 15 deletions(-)
> >>
> >> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >> index 72c65df..609b5fd 100644
> >> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
> >>   	int diag, i;
> >>
> >>   	/* allocate buffers in bulk directly into the S/W ring */
> >> -	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
> >> -				(rxq->rx_free_thresh - 1));
> >> +	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
> >
> > I think all these extra casts came in to keep icc 12.* compiling without warnings.
> > I am agree that they are unnecessary.
> > Though if we still have to support icc 12.* we either need to keep them, or find
> > some other way to keep it happy.
> > Konstantin
> >
> 
> What warnings icc 12.* is throwing? 

Try and see :)

>Only warning I can think of here is
> signed -> unsigned implicit cast. 

If I remember things correctly, it considered result at right side of '=' operator as unsigned int,
and then complained that we assign it to smaller size (unsigned short) operand.  

>Changing '1' to '1U' helps?

Don't think so, but you are welcome to try.

Konstantin

> 
> 
> --
> Pawel

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vlad Zolotarov]

On 03/09/15 13:29, Ananyev, Konstantin wrote:
>
>> -----Original Message-----
>> From: Wodkowski, PawelX
>> Sent: Monday, March 09, 2015 11:09 AM
>> To: Ananyev, Konstantin; Vlad Zolotarov; dev@dpdk.org
>> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
>>
>> On 2015-03-09 11:49, Ananyev, Konstantin wrote:
>>>
>>>> -----Original Message-----
>>>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
>>>> Sent: Monday, March 09, 2015 10:21 AM
>>>> To: dev@dpdk.org
>>>> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
>>>>
>>>>      - Removed the not needed casting.
>>>>      - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
>>>>                             &dev->data->dev_conf.rxmode.
>>>>
>>>> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
>>>> ---
>>>>    lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
>>>>    1 file changed, 12 insertions(+), 15 deletions(-)
>>>>
>>>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>>>> index 72c65df..609b5fd 100644
>>>> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>>>> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>>>> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
>>>>    	int diag, i;
>>>>
>>>>    	/* allocate buffers in bulk directly into the S/W ring */
>>>> -	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
>>>> -				(rxq->rx_free_thresh - 1));
>>>> +	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
>>> I think all these extra casts came in to keep icc 12.* compiling without warnings.
>>> I am agree that they are unnecessary.
>>> Though if we still have to support icc 12.* we either need to keep them, or find
>>> some other way to keep it happy.
>>> Konstantin
>>>
>> What warnings icc 12.* is throwing?
> Try and see :)
>
>> Only warning I can think of here is
>> signed -> unsigned implicit cast.
> If I remember things correctly, it considered result at right side of '=' operator as unsigned int,
> and then complained that we assign it to smaller size (unsigned short) operand.

If that's the case - that's a clear compiler bug.

>
>> Changing '1' to '1U' helps?
> Don't think so, but you are welcome to try.
>
> Konstantin
>
>>
>> --
>> Pawel

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Ananyev, Konstantin]

> -----Original Message-----
> From: Vlad Zolotarov [mailto:vladz@cloudius-systems.com]
> Sent: Monday, March 09, 2015 3:58 PM
> To: Ananyev, Konstantin; Wodkowski, PawelX; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> 
> 
> 
> On 03/09/15 13:29, Ananyev, Konstantin wrote:
> >
> >> -----Original Message-----
> >> From: Wodkowski, PawelX
> >> Sent: Monday, March 09, 2015 11:09 AM
> >> To: Ananyev, Konstantin; Vlad Zolotarov; dev@dpdk.org
> >> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >>
> >> On 2015-03-09 11:49, Ananyev, Konstantin wrote:
> >>>
> >>>> -----Original Message-----
> >>>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
> >>>> Sent: Monday, March 09, 2015 10:21 AM
> >>>> To: dev@dpdk.org
> >>>> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >>>>
> >>>>      - Removed the not needed casting.
> >>>>      - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
> >>>>                             &dev->data->dev_conf.rxmode.
> >>>>
> >>>> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
> >>>> ---
> >>>>    lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
> >>>>    1 file changed, 12 insertions(+), 15 deletions(-)
> >>>>
> >>>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >>>> index 72c65df..609b5fd 100644
> >>>> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >>>> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >>>> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
> >>>>    	int diag, i;
> >>>>
> >>>>    	/* allocate buffers in bulk directly into the S/W ring */
> >>>> -	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
> >>>> -				(rxq->rx_free_thresh - 1));
> >>>> +	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
> >>> I think all these extra casts came in to keep icc 12.* compiling without warnings.
> >>> I am agree that they are unnecessary.
> >>> Though if we still have to support icc 12.* we either need to keep them, or find
> >>> some other way to keep it happy.
> >>> Konstantin
> >>>
> >> What warnings icc 12.* is throwing?
> > Try and see :)
> >
> >> Only warning I can think of here is
> >> signed -> unsigned implicit cast.
> > If I remember things correctly, it considered result at right side of '=' operator as unsigned int,
> > and then complained that we assign it to smaller size (unsigned short) operand.
> 
> If that's the case - that's a clear compiler bug.

Might be, though if we still have to support it, there is no much choice I am afraid.

> 
> >
> >> Changing '1' to '1U' helps?
> > Don't think so, but you are welcome to try.
> >
> > Konstantin
> >
> >>
> >> --
> >> Pawel

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vladislav Zolotarov]

On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
wrote:
>
>
>
> > -----Original Message-----
> > From: Vlad Zolotarov [mailto:vladz@cloudius-systems.com]
> > Sent: Monday, March 09, 2015 3:58 PM
> > To: Ananyev, Konstantin; Wodkowski, PawelX; dev@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >
> >
> >
> > On 03/09/15 13:29, Ananyev, Konstantin wrote:
> > >
> > >> -----Original Message-----
> > >> From: Wodkowski, PawelX
> > >> Sent: Monday, March 09, 2015 11:09 AM
> > >> To: Ananyev, Konstantin; Vlad Zolotarov; dev@dpdk.org
> > >> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> > >>
> > >> On 2015-03-09 11:49, Ananyev, Konstantin wrote:
> > >>>
> > >>>> -----Original Message-----
> > >>>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
> > >>>> Sent: Monday, March 09, 2015 10:21 AM
> > >>>> To: dev@dpdk.org
> > >>>> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> > >>>>
> > >>>>      - Removed the not needed casting.
> > >>>>      - ixgbe_dev_rx_init(): shorten the lines by defining a local
alias variable to access
> > >>>>                             &dev->data->dev_conf.rxmode.
> > >>>>
> > >>>> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
> > >>>> ---
> > >>>>    lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27
++++++++++++---------------
> > >>>>    1 file changed, 12 insertions(+), 15 deletions(-)
> > >>>>
> > >>>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> > >>>> index 72c65df..609b5fd 100644
> > >>>> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> > >>>> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> > >>>> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
> > >>>>          int diag, i;
> > >>>>
> > >>>>          /* allocate buffers in bulk directly into the S/W ring */
> > >>>> -        alloc_idx = (uint16_t)(rxq->rx_free_trigger -
> > >>>> -                                (rxq->rx_free_thresh - 1));
> > >>>> +        alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh -
1);
> > >>> I think all these extra casts came in to keep icc 12.* compiling
without warnings.
> > >>> I am agree that they are unnecessary.
> > >>> Though if we still have to support icc 12.* we either need to keep
them, or find
> > >>> some other way to keep it happy.
> > >>> Konstantin
> > >>>
> > >> What warnings icc 12.* is throwing?
> > > Try and see :)
> > >
> > >> Only warning I can think of here is
> > >> signed -> unsigned implicit cast.
> > > If I remember things correctly, it considered result at right side of
'=' operator as unsigned int,
> > > and then complained that we assign it to smaller size (unsigned
short) operand.
> >
> > If that's the case - that's a clear compiler bug.
>
> Might be, though if we still have to support it, there is no much choice
I am afraid.

Well to begin with could anybody who has this icc thing (preferably the
latest version) post the compilation errors u are talking about. Let's
continue this discussion with some specific things in hands. So far there
were a lot of "maybe"s and "as far as i remember"s. Could u, guys, pls., be
more specific so that i could address the real issues and not just your
fears? ;)

Thanks,
Vlad

>
> >
> > >
> > >> Changing '1' to '1U' helps?
> > > Don't think so, but you are welcome to try.
> > >
> > > Konstantin
> > >
> > >>
> > >> --
> > >> Pawel
>
,

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Mcnamara, John]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vladislav Zolotarov
> Sent: Monday, March 9, 2015 5:14 PM
> To: Ananyev, Konstantin
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> 
> On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin"
> <konstantin.ananyev@intel.com>
> wrote:
> > > > If I remember things correctly, it considered result at right side
> > > > of
> '=' operator as unsigned int,
> > > > and then complained that we assign it to smaller size (unsigned
> short) operand.
> > >
> > > If that's the case - that's a clear compiler bug.
> >
> > Might be, though if we still have to support it, there is no much
> > choice
> I am afraid.
> 
> Well to begin with could anybody who has this icc thing (preferably the
> latest version) post the compilation errors u are talking about

Hi,

For what it is worth there aren't any warnings with ICC 13 and the 1/3 patch (+ the previous patchset):

  $ make T=x86_64-native-linuxapp-icc install CC=icc
  Build complete

  $ git log --pretty=format:"%h - %an: %s" -4  
  b5d06e4 - Vladislav Zolotarov: ixgbe: Cleanups
  3cd0367 - Vladislav Zolotarov: ixgbe: Unify the rx_pkt_bulk callback ...
  10ed30e - Vladislav Zolotarov: ixgbe: Bug fix: Properly configure Rx ...
  2a5bc6a - Vladislav Zolotarov: ixgbe: Use the rte_le_to_cpu_xx()/rte_...

  $ icc --version
  icc (ICC) 13.1.1 20130313

John.
-- 

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vladislav Zolotarov]

On Mar 9, 2015 8:01 PM, "Mcnamara, John" <john.mcnamara@intel.com> wrote:
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vladislav Zolotarov
> > Sent: Monday, March 9, 2015 5:14 PM
> > To: Ananyev, Konstantin
> > Cc: dev@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >
> > On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin"
> > <konstantin.ananyev@intel.com>
> > wrote:
> > > > > If I remember things correctly, it considered result at right side
> > > > > of
> > '=' operator as unsigned int,
> > > > > and then complained that we assign it to smaller size (unsigned
> > short) operand.
> > > >
> > > > If that's the case - that's a clear compiler bug.
> > >
> > > Might be, though if we still have to support it, there is no much
> > > choice
> > I am afraid.
> >
> > Well to begin with could anybody who has this icc thing (preferably the
> > latest version) post the compilation errors u are talking about
>
> Hi,
>
> For what it is worth there aren't any warnings with ICC 13 and the 1/3
patch (+ the previous patchset):
>
>   $ make T=x86_64-native-linuxapp-icc install CC=icc
>   Build complete
>
>   $ git log --pretty=format:"%h - %an: %s" -4
>   b5d06e4 - Vladislav Zolotarov: ixgbe: Cleanups
>   3cd0367 - Vladislav Zolotarov: ixgbe: Unify the rx_pkt_bulk callback ...
>   10ed30e - Vladislav Zolotarov: ixgbe: Bug fix: Properly configure Rx ...
>   2a5bc6a - Vladislav Zolotarov: ixgbe: Use the rte_le_to_cpu_xx()/rte_...
>
>   $ icc --version
>   icc (ICC) 13.1.1 20130313

That's worth a lot to me!.. :D

>
> John.
> --
>
>

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vladislav Zolotarov]

On Mar 9, 2015 8:01 PM, "Mcnamara, John" <john.mcnamara@intel.com> wrote:
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vladislav Zolotarov
> > Sent: Monday, March 9, 2015 5:14 PM
> > To: Ananyev, Konstantin
> > Cc: dev@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >
> > On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin"
> > <konstantin.ananyev@intel.com>
> > wrote:
> > > > > If I remember things correctly, it considered result at right side
> > > > > of
> > '=' operator as unsigned int,
> > > > > and then complained that we assign it to smaller size (unsigned
> > short) operand.
> > > >
> > > > If that's the case - that's a clear compiler bug.
> > >
> > > Might be, though if we still have to support it, there is no much
> > > choice
> > I am afraid.
> >
> > Well to begin with could anybody who has this icc thing (preferably the
> > latest version) post the compilation errors u are talking about
>
> Hi,
>
> For what it is worth there aren't any warnings with ICC 13 and the 1/3
patch (+ the previous patchset):
>
>   $ make T=x86_64-native-linuxapp-icc install CC=icc
>   Build complete
>
>   $ git log --pretty=format:"%h - %an: %s" -4
>   b5d06e4 - Vladislav Zolotarov: ixgbe: Cleanups
>   3cd0367 - Vladislav Zolotarov: ixgbe: Unify the rx_pkt_bulk callback ...
>   10ed30e - Vladislav Zolotarov: ixgbe: Bug fix: Properly configure Rx ...
>   2a5bc6a - Vladislav Zolotarov: ixgbe: Use the rte_le_to_cpu_xx()/rte_...
>
>   $ icc --version
>   icc (ICC) 13.1.1 20130313

Thanks a lot, John.

>
> John.
> --
>
>

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Ananyev, Konstantin]

> 
> From: Vladislav Zolotarov [mailto:vladz@cloudius-systems.com]
> Sent: Monday, March 09, 2015 6:22 PM
> To: Mcnamara, John
> Cc: dev@dpdk.org; Ananyev, Konstantin
> Subject: RE: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> 
> 
> On Mar 9, 2015 8:01 PM, "Mcnamara, John" <john.mcnamara@intel.com> wrote:
> >
> > > -----Original Message-----
> > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vladislav Zolotarov
> > > Sent: Monday, March 9, 2015 5:14 PM
> > > To: Ananyev, Konstantin
> > > Cc: dev@dpdk.org
> > > Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> > >
> > > On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin"
> > > <konstantin.ananyev@intel.com>
> > > wrote:
> > > > > > If I remember things correctly, it considered result at right side
> > > > > > of
> > > '=' operator as unsigned int,
> > > > > > and then complained that we assign it to smaller size (unsigned
> > > short) operand.
> > > > >
> > > > > If that's the case - that's a clear compiler bug.
> > > >
> > > > Might be, though if we still have to support it, there is no much
> > > > choice
> > > I am afraid.
> > >
> > > Well to begin with could anybody who has this icc thing (preferably the
> > > latest version) post the compilation errors u are talking about
> >
> > Hi,
> >
> > For what it is worth there aren't any warnings with ICC 13 and the 1/3 patch (+ the previous patchset):
> >
> >   $ make T=x86_64-native-linuxapp-icc install CC=icc
> >   Build complete
> >
> >   $ git log --pretty=format:"%h - %an: %s" -4
> >   b5d06e4 - Vladislav Zolotarov: ixgbe: Cleanups
> >   3cd0367 - Vladislav Zolotarov: ixgbe: Unify the rx_pkt_bulk callback ...
> >   10ed30e - Vladislav Zolotarov: ixgbe: Bug fix: Properly configure Rx ...
> >   2a5bc6a - Vladislav Zolotarov: ixgbe: Use the rte_le_to_cpu_xx()/rte_...
> >
> >   $ icc --version
> >   icc (ICC) 13.1.1 20130313
> Thanks a lot, John.

As I said my worry was about 12.*.
icc v13* and above, are not that picky.
After applying the patch, indeed all these lines make icc 12.1 to generate warnings.
See below for details.
Though with icc 12.1 current dpdk.org main branch will generate ~2K unhandled warnings all over the places anyway...
Which makes me think that probably DPDK support for icc 12.* was scrapped already, I just didn't notice that.
Konstantin

$ icc -v
icc version 12.1.0 (gcc version 4.5.0 compatibility)

$ icc -Wp,-MD,./.ixgbe_rxtx.o.d.tmp -m64 -pthread  -march=native -DRTE_MACHINE_CPU
FLAG_SSE -DRTE_MACHINE_CPUFLAG_SSE2 -DRTE_MACHINE_CPUFLAG_SSE3 -DRTE_MACHINE_CPU
FLAG_SSSE3 -DRTE_MACHINE_CPUFLAG_SSE4_1 -DRTE_MACHINE_CPUFLAG_SSE4_2 -DRTE_MACHI
NE_CPUFLAG_AVX -DRTE_COMPILE_TIME_CPUFLAGS=RTE_CPUFLAG_SSE,RTE_CPUFLAG_SSE2,RTE_
CPUFLAG_SSE3,RTE_CPUFLAG_SSSE3,RTE_CPUFLAG_SSE4_1,RTE_CPUFLAG_SSE4_2,RTE_CPUFLAG
_AVX  -I/local/kananye1/dpdk.org/x86_64-native-linuxapp-icc/include -include /lo
cal/kananye1/dpdk.org/x86_64-native-linuxapp-icc/include/rte_config.h -O3 -Wall
-w2 -diag-disable 271 -diag-warning 1478 -diag-disable 13368 -diag-disable 15527   -o ixgbe_rxtx.o -c /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c

....

/local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1035): remark #2259:
non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose signif
icant bits
        alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
                  ^

/local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1064): remark #2259: non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose significant bits
        rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
                             ^

/local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1067): remark #2259: non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose significant bits
                rxq->rx_free_trigger = rxq->rx_free_thresh - 1;

....

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vlad Zolotarov]

On 03/09/15 21:13, Ananyev, Konstantin wrote:
>
>> From: Vladislav Zolotarov [mailto:vladz@cloudius-systems.com]
>> Sent: Monday, March 09, 2015 6:22 PM
>> To: Mcnamara, John
>> Cc: dev@dpdk.org; Ananyev, Konstantin
>> Subject: RE: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
>>
>>
>> On Mar 9, 2015 8:01 PM, "Mcnamara, John" <john.mcnamara@intel.com> wrote:
>>>> -----Original Message-----
>>>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vladislav Zolotarov
>>>> Sent: Monday, March 9, 2015 5:14 PM
>>>> To: Ananyev, Konstantin
>>>> Cc: dev@dpdk.org
>>>> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
>>>>
>>>> On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin"
>>>> <konstantin.ananyev@intel.com>
>>>> wrote:
>>>>>>> If I remember things correctly, it considered result at right side
>>>>>>> of
>>>> '=' operator as unsigned int,
>>>>>>> and then complained that we assign it to smaller size (unsigned
>>>> short) operand.
>>>>>> If that's the case - that's a clear compiler bug.
>>>>> Might be, though if we still have to support it, there is no much
>>>>> choice
>>>> I am afraid.
>>>>
>>>> Well to begin with could anybody who has this icc thing (preferably the
>>>> latest version) post the compilation errors u are talking about
>>> Hi,
>>>
>>> For what it is worth there aren't any warnings with ICC 13 and the 1/3 patch (+ the previous patchset):
>>>
>>>    $ make T=x86_64-native-linuxapp-icc install CC=icc
>>>    Build complete
>>>
>>>    $ git log --pretty=format:"%h - %an: %s" -4
>>>    b5d06e4 - Vladislav Zolotarov: ixgbe: Cleanups
>>>    3cd0367 - Vladislav Zolotarov: ixgbe: Unify the rx_pkt_bulk callback ...
>>>    10ed30e - Vladislav Zolotarov: ixgbe: Bug fix: Properly configure Rx ...
>>>    2a5bc6a - Vladislav Zolotarov: ixgbe: Use the rte_le_to_cpu_xx()/rte_...
>>>
>>>    $ icc --version
>>>    icc (ICC) 13.1.1 20130313
>> Thanks a lot, John.
> As I said my worry was about 12.*.
> icc v13* and above, are not that picky.
> After applying the patch, indeed all these lines make icc 12.1 to generate warnings.
> See below for details.
> Though with icc 12.1 current dpdk.org main branch will generate ~2K unhandled warnings all over the places anyway...
> Which makes me think that probably DPDK support for icc 12.* was scrapped already, I just didn't notice that.

So, I suppose this concludes this specific discussion, right? ;)

> Konstantin
>
> $ icc -v
> icc version 12.1.0 (gcc version 4.5.0 compatibility)
>
> $ icc -Wp,-MD,./.ixgbe_rxtx.o.d.tmp -m64 -pthread  -march=native -DRTE_MACHINE_CPU
> FLAG_SSE -DRTE_MACHINE_CPUFLAG_SSE2 -DRTE_MACHINE_CPUFLAG_SSE3 -DRTE_MACHINE_CPU
> FLAG_SSSE3 -DRTE_MACHINE_CPUFLAG_SSE4_1 -DRTE_MACHINE_CPUFLAG_SSE4_2 -DRTE_MACHI
> NE_CPUFLAG_AVX -DRTE_COMPILE_TIME_CPUFLAGS=RTE_CPUFLAG_SSE,RTE_CPUFLAG_SSE2,RTE_
> CPUFLAG_SSE3,RTE_CPUFLAG_SSSE3,RTE_CPUFLAG_SSE4_1,RTE_CPUFLAG_SSE4_2,RTE_CPUFLAG
> _AVX  -I/local/kananye1/dpdk.org/x86_64-native-linuxapp-icc/include -include /lo
> cal/kananye1/dpdk.org/x86_64-native-linuxapp-icc/include/rte_config.h -O3 -Wall
> -w2 -diag-disable 271 -diag-warning 1478 -diag-disable 13368 -diag-disable 15527   -o ixgbe_rxtx.o -c /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>
> ....
>
> /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1035): remark #2259:
> non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose signif
> icant bits
>          alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
>                    ^
>
> /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1064): remark #2259: non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose significant bits
>          rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
>                               ^
>
> /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1067): remark #2259: non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose significant bits
>                  rxq->rx_free_trigger = rxq->rx_free_thresh - 1;
>
> ....
>

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Ananyev, Konstantin]

> -----Original Message-----
> From: Vlad Zolotarov [mailto:vladz@cloudius-systems.com]
> Sent: Monday, March 09, 2015 7:32 PM
> To: Ananyev, Konstantin
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> 
> 
> 
> On 03/09/15 21:13, Ananyev, Konstantin wrote:
> >
> >> From: Vladislav Zolotarov [mailto:vladz@cloudius-systems.com]
> >> Sent: Monday, March 09, 2015 6:22 PM
> >> To: Mcnamara, John
> >> Cc: dev@dpdk.org; Ananyev, Konstantin
> >> Subject: RE: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >>
> >>
> >> On Mar 9, 2015 8:01 PM, "Mcnamara, John" <john.mcnamara@intel.com> wrote:
> >>>> -----Original Message-----
> >>>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vladislav Zolotarov
> >>>> Sent: Monday, March 9, 2015 5:14 PM
> >>>> To: Ananyev, Konstantin
> >>>> Cc: dev@dpdk.org
> >>>> Subject: Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
> >>>>
> >>>> On Mar 9, 2015 6:39 PM, "Ananyev, Konstantin"
> >>>> <konstantin.ananyev@intel.com>
> >>>> wrote:
> >>>>>>> If I remember things correctly, it considered result at right side
> >>>>>>> of
> >>>> '=' operator as unsigned int,
> >>>>>>> and then complained that we assign it to smaller size (unsigned
> >>>> short) operand.
> >>>>>> If that's the case - that's a clear compiler bug.
> >>>>> Might be, though if we still have to support it, there is no much
> >>>>> choice
> >>>> I am afraid.
> >>>>
> >>>> Well to begin with could anybody who has this icc thing (preferably the
> >>>> latest version) post the compilation errors u are talking about
> >>> Hi,
> >>>
> >>> For what it is worth there aren't any warnings with ICC 13 and the 1/3 patch (+ the previous patchset):
> >>>
> >>>    $ make T=x86_64-native-linuxapp-icc install CC=icc
> >>>    Build complete
> >>>
> >>>    $ git log --pretty=format:"%h - %an: %s" -4
> >>>    b5d06e4 - Vladislav Zolotarov: ixgbe: Cleanups
> >>>    3cd0367 - Vladislav Zolotarov: ixgbe: Unify the rx_pkt_bulk callback ...
> >>>    10ed30e - Vladislav Zolotarov: ixgbe: Bug fix: Properly configure Rx ...
> >>>    2a5bc6a - Vladislav Zolotarov: ixgbe: Use the rte_le_to_cpu_xx()/rte_...
> >>>
> >>>    $ icc --version
> >>>    icc (ICC) 13.1.1 20130313
> >> Thanks a lot, John.
> > As I said my worry was about 12.*.
> > icc v13* and above, are not that picky.
> > After applying the patch, indeed all these lines make icc 12.1 to generate warnings.
> > See below for details.
> > Though with icc 12.1 current dpdk.org main branch will generate ~2K unhandled warnings all over the places anyway...
> > Which makes me think that probably DPDK support for icc 12.* was scrapped already, I just didn't notice that.
> 
> So, I suppose this concludes this specific discussion, right? ;)

I believe so.
Sorry for the noise generated.
Konstantin

> 
> > Konstantin
> >
> > $ icc -v
> > icc version 12.1.0 (gcc version 4.5.0 compatibility)
> >
> > $ icc -Wp,-MD,./.ixgbe_rxtx.o.d.tmp -m64 -pthread  -march=native -DRTE_MACHINE_CPU
> > FLAG_SSE -DRTE_MACHINE_CPUFLAG_SSE2 -DRTE_MACHINE_CPUFLAG_SSE3 -DRTE_MACHINE_CPU
> > FLAG_SSSE3 -DRTE_MACHINE_CPUFLAG_SSE4_1 -DRTE_MACHINE_CPUFLAG_SSE4_2 -DRTE_MACHI
> > NE_CPUFLAG_AVX -DRTE_COMPILE_TIME_CPUFLAGS=RTE_CPUFLAG_SSE,RTE_CPUFLAG_SSE2,RTE_
> > CPUFLAG_SSE3,RTE_CPUFLAG_SSSE3,RTE_CPUFLAG_SSE4_1,RTE_CPUFLAG_SSE4_2,RTE_CPUFLAG
> > _AVX  -I/local/kananye1/dpdk.org/x86_64-native-linuxapp-icc/include -include /lo
> > cal/kananye1/dpdk.org/x86_64-native-linuxapp-icc/include/rte_config.h -O3 -Wall
> > -w2 -diag-disable 271 -diag-warning 1478 -diag-disable 13368 -diag-disable 15527   -o ixgbe_rxtx.o -c
> /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
> >
> > ....
> >
> > /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1035): remark #2259:
> > non-pointer conversion from "int" to "uint16_t={unsigned short}" may lose signif
> > icant bits
> >          alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
> >                    ^
> >
> > /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1064): remark #2259: non-pointer conversion from "int" to
> "uint16_t={unsigned short}" may lose significant bits
> >          rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
> >                               ^
> >
> > /local/kananye1/dpdk.org/lib/librte_pmd_ixgbe/ixgbe_rxtx.c(1067): remark #2259: non-pointer conversion from "int" to
> "uint16_t={unsigned short}" may lose significant bits
> >                  rxq->rx_free_trigger = rxq->rx_free_thresh - 1;
> >
> > ....
> >

Re: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups

[Vlad Zolotarov]

On 03/09/15 12:49, Ananyev, Konstantin wrote:
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Vlad Zolotarov
>> Sent: Monday, March 09, 2015 10:21 AM
>> To: dev@dpdk.org
>> Subject: [dpdk-dev] [PATCH v5 1/3] ixgbe: Cleanups
>>
>>     - Removed the not needed casting.
>>     - ixgbe_dev_rx_init(): shorten the lines by defining a local alias variable to access
>>                            &dev->data->dev_conf.rxmode.
>>
>> Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
>> ---
>>   lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 27 ++++++++++++---------------
>>   1 file changed, 12 insertions(+), 15 deletions(-)
>>
>> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>> index 72c65df..609b5fd 100644
>> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
>> @@ -1032,8 +1032,7 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
>>   	int diag, i;
>>
>>   	/* allocate buffers in bulk directly into the S/W ring */
>> -	alloc_idx = (uint16_t)(rxq->rx_free_trigger -
>> -				(rxq->rx_free_thresh - 1));
>> +	alloc_idx = rxq->rx_free_trigger - (rxq->rx_free_thresh - 1);
> I think all these extra casts came in to keep icc 12.* compiling without warnings.
> I am agree that they are unnecessary.
> Though if we still have to support icc 12.* we either need to keep them, or find
> some other way to keep it happy.
Fix icc maybe?
I'm sorry, but what do I miss here? Both alloc_idx, rxq->rx_free_trigger 
and rxq->rx_free_thresh are uint16_t

So, according to C standard the result is also uint16_t thus no casting 
is needed:

the result of a subtraction generating a negative number in an unsigned type is well-defined:

     1. [...] A computation involving unsigned operands can never
        overflow, because a result that cannot be represented by the
        resulting unsigned integer type is reduced modulo the number
        that is one greater than the largest value that can be
        represented by the resulting type. (ISO/IEC 9899:1999 (E) §6.2.5/9)


Could u, pls., be more specific and send here the error generated by icc 
after my patches?

thanks,
vlad



> Konstantin
>
>>   	rxep = &rxq->sw_ring[alloc_idx];
>>   	diag = rte_mempool_get_bulk(rxq->mb_pool, (void *)rxep,
>>   				    rxq->rx_free_thresh);
>> @@ -1061,10 +1060,9 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
>>   	IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rxq->rx_free_trigger);
>>
>>   	/* update state of internal queue structure */
>> -	rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_trigger +
>> -						rxq->rx_free_thresh);
>> +	rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
>>   	if (rxq->rx_free_trigger >= rxq->nb_rx_desc)
>> -		rxq->rx_free_trigger = (uint16_t)(rxq->rx_free_thresh - 1);
>> +		rxq->rx_free_trigger = rxq->rx_free_thresh - 1;
>>
>>   	/* no errors */
>>   	return 0;
>> @@ -3560,6 +3558,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   	uint32_t rxcsum;
>>   	uint16_t buf_size;
>>   	uint16_t i;
>> +	struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
>>
>>   	PMD_INIT_FUNC_TRACE();
>>   	hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
>> @@ -3582,7 +3581,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   	 * Configure CRC stripping, if any.
>>   	 */
>>   	hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
>> -	if (dev->data->dev_conf.rxmode.hw_strip_crc)
>> +	if (rx_conf->hw_strip_crc)
>>   		hlreg0 |= IXGBE_HLREG0_RXCRCSTRP;
>>   	else
>>   		hlreg0 &= ~IXGBE_HLREG0_RXCRCSTRP;
>> @@ -3590,11 +3589,11 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   	/*
>>   	 * Configure jumbo frame support, if any.
>>   	 */
>> -	if (dev->data->dev_conf.rxmode.jumbo_frame == 1) {
>> +	if (rx_conf->jumbo_frame == 1) {
>>   		hlreg0 |= IXGBE_HLREG0_JUMBOEN;
>>   		maxfrs = IXGBE_READ_REG(hw, IXGBE_MAXFRS);
>>   		maxfrs &= 0x0000FFFF;
>> -		maxfrs |= (dev->data->dev_conf.rxmode.max_rx_pkt_len << 16);
>> +		maxfrs |= (rx_conf->max_rx_pkt_len << 16);
>>   		IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, maxfrs);
>>   	} else
>>   		hlreg0 &= ~IXGBE_HLREG0_JUMBOEN;
>> @@ -3618,9 +3617,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   		 * Reset crc_len in case it was changed after queue setup by a
>>   		 * call to configure.
>>   		 */
>> -		rxq->crc_len = (uint8_t)
>> -				((dev->data->dev_conf.rxmode.hw_strip_crc) ? 0 :
>> -				ETHER_CRC_LEN);
>> +		rxq->crc_len = rx_conf->hw_strip_crc ? 0 : ETHER_CRC_LEN;
>>
>>   		/* Setup the Base and Length of the Rx Descriptor Rings */
>>   		bus_addr = rxq->rx_ring_phys_addr;
>> @@ -3638,7 +3635,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   		/*
>>   		 * Configure Header Split
>>   		 */
>> -		if (dev->data->dev_conf.rxmode.header_split) {
>> +		if (rx_conf->header_split) {
>>   			if (hw->mac.type == ixgbe_mac_82599EB) {
>>   				/* Must setup the PSRTYPE register */
>>   				uint32_t psrtype;
>> @@ -3648,7 +3645,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   					IXGBE_PSRTYPE_IPV6HDR;
>>   				IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx), psrtype);
>>   			}
>> -			srrctl = ((dev->data->dev_conf.rxmode.split_hdr_size <<
>> +			srrctl = ((rx_conf->split_hdr_size <<
>>   				IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
>>   				IXGBE_SRRCTL_BSIZEHDR_MASK);
>>   			srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
>> @@ -3699,7 +3696,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   	 */
>>   	rxcsum = IXGBE_READ_REG(hw, IXGBE_RXCSUM);
>>   	rxcsum |= IXGBE_RXCSUM_PCSD;
>> -	if (dev->data->dev_conf.rxmode.hw_ip_checksum)
>> +	if (rx_conf->hw_ip_checksum)
>>   		rxcsum |= IXGBE_RXCSUM_IPPCSE;
>>   	else
>>   		rxcsum &= ~IXGBE_RXCSUM_IPPCSE;
>> @@ -3709,7 +3706,7 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
>>   	if (hw->mac.type == ixgbe_mac_82599EB ||
>>   	    hw->mac.type == ixgbe_mac_X540) {
>>   		rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
>> -		if (dev->data->dev_conf.rxmode.hw_strip_crc)
>> +		if (rx_conf->hw_strip_crc)
>>   			rdrxctl |= IXGBE_RDRXCTL_CRCSTRIP;
>>   		else
>>   			rdrxctl &= ~IXGBE_RDRXCTL_CRCSTRIP;
>> --
>> 2.1.0

[dpdk-dev] [PATCH v5 2/3] ixgbe: Code refactoring

[Vlad Zolotarov]

    - ixgbe_rx_alloc_bufs():
       - Reset the rte_mbuf fields only when requested.
       - Take the RDT update out of the function.
       - Add the stub when RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC is not defined.
    - ixgbe_recv_scattered_pkts():
       - Take the code that updates the fields of the cluster's HEAD buffer into
         the inline function.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>

New in v3:
   - ixgbe_rx_alloc_bufs(): Always reset refcnt of the buffers to 1.
---
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 114 +++++++++++++++++++++++---------------
 1 file changed, 69 insertions(+), 45 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
index 609b5fd..37aca5d 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
@@ -1022,7 +1022,7 @@ ixgbe_rx_scan_hw_ring(struct igb_rx_queue *rxq)
 }
 
 static inline int
-ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
+ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq, bool reset_mbuf)
 {
 	volatile union ixgbe_adv_rx_desc *rxdp;
 	struct igb_rx_entry *rxep;
@@ -1043,11 +1043,14 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
 	for (i = 0; i < rxq->rx_free_thresh; ++i) {
 		/* populate the static rte mbuf fields */
 		mb = rxep[i].mbuf;
+		if (reset_mbuf) {
+			mb->next = NULL;
+			mb->nb_segs = 1;
+			mb->port = rxq->port_id;
+		}
+
 		rte_mbuf_refcnt_set(mb, 1);
-		mb->next = NULL;
 		mb->data_off = RTE_PKTMBUF_HEADROOM;
-		mb->nb_segs = 1;
-		mb->port = rxq->port_id;
 
 		/* populate the descriptors */
 		dma_addr = rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(mb));
@@ -1055,10 +1058,6 @@ ixgbe_rx_alloc_bufs(struct igb_rx_queue *rxq)
 		rxdp[i].read.pkt_addr = dma_addr;
 	}
 
-	/* update tail pointer */
-	rte_wmb();
-	IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rxq->rx_free_trigger);
-
 	/* update state of internal queue structure */
 	rxq->rx_free_trigger = rxq->rx_free_trigger + rxq->rx_free_thresh;
 	if (rxq->rx_free_trigger >= rxq->nb_rx_desc)
@@ -1110,7 +1109,9 @@ rx_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 
 	/* if required, allocate new buffers to replenish descriptors */
 	if (rxq->rx_tail > rxq->rx_free_trigger) {
-		if (ixgbe_rx_alloc_bufs(rxq) != 0) {
+		uint16_t cur_free_trigger = rxq->rx_free_trigger;
+
+		if (ixgbe_rx_alloc_bufs(rxq, true) != 0) {
 			int i, j;
 			PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
 				   "queue_id=%u", (unsigned) rxq->port_id,
@@ -1130,6 +1131,10 @@ rx_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 
 			return 0;
 		}
+
+		/* update tail pointer */
+		rte_wmb();
+		IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, cur_free_trigger);
 	}
 
 	if (rxq->rx_tail >= rxq->nb_rx_desc)
@@ -1169,6 +1174,13 @@ ixgbe_recv_pkts_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts,
 
 	return nb_rx;
 }
+#else
+static inline int
+ixgbe_rx_alloc_bufs(__rte_unused struct igb_rx_queue *rxq,
+		    __rte_unused bool reset_mbuf)
+{
+	return -ENOMEM;
+}
 #endif /* RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC */
 
 uint16_t
@@ -1353,6 +1365,51 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 	return (nb_rx);
 }
 
+/**
+ * Initialize the first mbuf of the returned packet:
+ *    - RX port identifier,
+ *    - hardware offload data, if any:
+ *      - RSS flag & hash,
+ *      - IP checksum flag,
+ *      - VLAN TCI, if any,
+ *      - error flags.
+ * @head HEAD of the packet cluster
+ * @desc HW descriptor to get data from
+ * @port_id Port ID of the Rx queue
+ */
+static inline void ixgbe_fill_cluster_head_buf(
+	struct rte_mbuf *head,
+	union ixgbe_adv_rx_desc *desc,
+	uint8_t port_id,
+	uint32_t staterr)
+{
+	uint32_t hlen_type_rss;
+	uint64_t pkt_flags;
+
+	head->port = port_id;
+
+	/*
+	 * The vlan_tci field is only valid when PKT_RX_VLAN_PKT is
+	 * set in the pkt_flags field.
+	 */
+	head->vlan_tci = rte_le_to_cpu_16(desc->wb.upper.vlan);
+	hlen_type_rss = rte_le_to_cpu_32(desc->wb.lower.lo_dword.data);
+	pkt_flags = rx_desc_hlen_type_rss_to_pkt_flags(hlen_type_rss);
+	pkt_flags |= rx_desc_status_to_pkt_flags(staterr);
+	pkt_flags |= rx_desc_error_to_pkt_flags(staterr);
+	head->ol_flags = pkt_flags;
+
+	if (likely(pkt_flags & PKT_RX_RSS_HASH))
+		head->hash.rss = rte_le_to_cpu_32(desc->wb.lower.hi_dword.rss);
+	else if (pkt_flags & PKT_RX_FDIR) {
+		head->hash.fdir.hash =
+			rte_le_to_cpu_16(desc->wb.lower.hi_dword.csum_ip.csum)
+							  & IXGBE_ATR_HASH_MASK;
+		head->hash.fdir.id =
+			rte_le_to_cpu_16(desc->wb.lower.hi_dword.csum_ip.ip_id);
+	}
+}
+
 uint16_t
 ixgbe_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 			  uint16_t nb_pkts)
@@ -1369,12 +1426,10 @@ ixgbe_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 	union ixgbe_adv_rx_desc rxd;
 	uint64_t dma; /* Physical address of mbuf data buffer */
 	uint32_t staterr;
-	uint32_t hlen_type_rss;
 	uint16_t rx_id;
 	uint16_t nb_rx;
 	uint16_t nb_hold;
 	uint16_t data_len;
-	uint64_t pkt_flags;
 
 	nb_rx = 0;
 	nb_hold = 0;
@@ -1532,40 +1587,9 @@ ixgbe_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 					(uint16_t) (data_len - ETHER_CRC_LEN);
 		}
 
-		/*
-		 * Initialize the first mbuf of the returned packet:
-		 *    - RX port identifier,
-		 *    - hardware offload data, if any:
-		 *      - RSS flag & hash,
-		 *      - IP checksum flag,
-		 *      - VLAN TCI, if any,
-		 *      - error flags.
-		 */
-		first_seg->port = rxq->port_id;
-
-		/*
-		 * The vlan_tci field is only valid when PKT_RX_VLAN_PKT is
-		 * set in the pkt_flags field.
-		 */
-		first_seg->vlan_tci = rte_le_to_cpu_16(rxd.wb.upper.vlan);
-		hlen_type_rss = rte_le_to_cpu_32(rxd.wb.lower.lo_dword.data);
-		pkt_flags = rx_desc_hlen_type_rss_to_pkt_flags(hlen_type_rss);
-		pkt_flags = (pkt_flags |
-				rx_desc_status_to_pkt_flags(staterr));
-		pkt_flags = (pkt_flags |
-				rx_desc_error_to_pkt_flags(staterr));
-		first_seg->ol_flags = pkt_flags;
-
-		if (likely(pkt_flags & PKT_RX_RSS_HASH))
-			first_seg->hash.rss =
-				    rte_le_to_cpu_32(rxd.wb.lower.hi_dword.rss);
-		else if (pkt_flags & PKT_RX_FDIR) {
-			first_seg->hash.fdir.hash =
-			    rte_le_to_cpu_16(rxd.wb.lower.hi_dword.csum_ip.csum)
-					   & IXGBE_ATR_HASH_MASK;
-			first_seg->hash.fdir.id =
-			  rte_le_to_cpu_16(rxd.wb.lower.hi_dword.csum_ip.ip_id);
-		}
+		/* Initialize the first mbuf of the returned packet */
+		ixgbe_fill_cluster_head_buf(first_seg, &rxd, rxq->port_id,
+					    staterr);
 
 		/* Prefetch data of first segment, if configured to do so. */
 		rte_packet_prefetch((char *)first_seg->buf_addr +
-- 
2.1.0

[dpdk-dev] [PATCH v5 3/3] ixgbe: Add LRO support

[Vlad Zolotarov]

    - Only x540 and 82599 devices support LRO.
    - Add the appropriate HW configuration.
    - Add RSC aware rx_pkt_burst() handlers:
       - Implemented bulk allocation and non-bulk allocation versions.
       - Add LRO-specific fields to rte_eth_rxmode, to rte_eth_dev_data
         and to igb_rx_queue.
       - Use the appropriate handler when LRO is requested.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
---
New in v5:
   - Put the RTE_ETHDEV_HAS_LRO_SUPPORT definition at the beginning of rte_ethdev.h.
   - Removed the "TODO: Remove me" comment near RTE_ETHDEV_HAS_LRO_SUPPORT.

New in v4:
   - Define RTE_ETHDEV_HAS_LRO_SUPPORT in rte_ethdev.h instead of
     RTE_ETHDEV_LRO_SUPPORT defined in config/common_linuxapp.

New in v2:
   - Removed rte_eth_dev_data.lro_bulk_alloc.
   - Fixed a few styling and spelling issues.
---
 lib/librte_ether/rte_ethdev.h       |   9 +-
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c |   6 +
 lib/librte_pmd_ixgbe/ixgbe_ethdev.h |   5 +
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c   | 562 +++++++++++++++++++++++++++++++++++-
 lib/librte_pmd_ixgbe/ixgbe_rxtx.h   |   6 +
 5 files changed, 581 insertions(+), 7 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 8db3127..44f081f 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -172,6 +172,9 @@ extern "C" {
 
 #include <stdint.h>
 
+/* Use this macro to check if LRO API is supported */
+#define RTE_ETHDEV_HAS_LRO_SUPPORT
+
 #include <rte_log.h>
 #include <rte_interrupts.h>
 #include <rte_pci.h>
@@ -320,14 +323,15 @@ struct rte_eth_rxmode {
 	enum rte_eth_rx_mq_mode mq_mode;
 	uint32_t max_rx_pkt_len;  /**< Only used if jumbo_frame enabled. */
 	uint16_t split_hdr_size;  /**< hdr buf size (header_split enabled).*/
-	uint8_t header_split : 1, /**< Header Split enable. */
+	uint16_t header_split : 1, /**< Header Split enable. */
 		hw_ip_checksum   : 1, /**< IP/UDP/TCP checksum offload enable. */
 		hw_vlan_filter   : 1, /**< VLAN filter enable. */
 		hw_vlan_strip    : 1, /**< VLAN strip enable. */
 		hw_vlan_extend   : 1, /**< Extended VLAN enable. */
 		jumbo_frame      : 1, /**< Jumbo Frame Receipt enable. */
 		hw_strip_crc     : 1, /**< Enable CRC stripping by hardware. */
-		enable_scatter   : 1; /**< Enable scatter packets rx handler */
+		enable_scatter   : 1, /**< Enable scatter packets rx handler */
+		enable_lro       : 1; /**< Enable LRO */
 };
 
 /**
@@ -1515,6 +1519,7 @@ struct rte_eth_dev_data {
 	uint8_t port_id;           /**< Device [external] port identifier. */
 	uint8_t promiscuous   : 1, /**< RX promiscuous mode ON(1) / OFF(0). */
 		scattered_rx : 1,  /**< RX of scattered packets is ON(1) / OFF(0) */
+		lro          : 1,  /**< RX LRO is ON(1) / OFF(0) */
 		all_multicast : 1, /**< RX all multicast mode ON(1) / OFF(0). */
 		dev_started : 1;   /**< Device state: STARTED(1) / STOPPED(0). */
 };
diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
index 9d3de1a..765174d 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
@@ -1648,6 +1648,7 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
 
 	/* Clear stored conf */
 	dev->data->scattered_rx = 0;
+	dev->data->lro = 0;
 	hw->rx_bulk_alloc_allowed = false;
 	hw->rx_vec_allowed = false;
 
@@ -2018,6 +2019,11 @@ ixgbe_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		DEV_RX_OFFLOAD_IPV4_CKSUM |
 		DEV_RX_OFFLOAD_UDP_CKSUM  |
 		DEV_RX_OFFLOAD_TCP_CKSUM;
+
+	if (hw->mac.type == ixgbe_mac_82599EB ||
+	    hw->mac.type == ixgbe_mac_X540)
+		dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_TCP_LRO;
+
 	dev_info->tx_offload_capa =
 		DEV_TX_OFFLOAD_VLAN_INSERT |
 		DEV_TX_OFFLOAD_IPV4_CKSUM  |
diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
index a549f5c..e206584 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.h
@@ -349,6 +349,11 @@ uint16_t ixgbe_recv_pkts_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts,
 uint16_t ixgbe_recv_scattered_pkts(void *rx_queue,
 		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
 
+uint16_t ixgbe_recv_pkts_lro(void *rx_queue,
+		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
+uint16_t ixgbe_recv_pkts_lro_bulk_alloc(void *rx_queue,
+		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
+
 uint16_t ixgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 		uint16_t nb_pkts);
 
diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
index 37aca5d..593adb9 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
@@ -1366,6 +1366,15 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 }
 
 /**
+ * Detect an RSC descriptor.
+ */
+static inline uint32_t ixgbe_rsc_count(union ixgbe_adv_rx_desc *rx)
+{
+	return (rte_le_to_cpu_32(rx->wb.lower.lo_dword.data) &
+		IXGBE_RXDADV_RSCCNT_MASK) >> IXGBE_RXDADV_RSCCNT_SHIFT;
+}
+
+/**
  * Initialize the first mbuf of the returned packet:
  *    - RX port identifier,
  *    - hardware offload data, if any:
@@ -1410,6 +1419,291 @@ static inline void ixgbe_fill_cluster_head_buf(
 	}
 }
 
+/**
+ * Bulk receive handler for and LRO case.
+ *
+ * @rx_queue Rx queue handle
+ * @rx_pkts table of received packets
+ * @nb_pkts size of rx_pkts table
+ * @bulk_alloc if TRUE bulk allocation is used for a HW ring refilling
+ *
+ * Handles the Rx HW ring completions when RSC feature is configured. Uses an
+ * additional ring of igb_rsc_entry's that will hold the relevant RSC info.
+ *
+ * We use the same logic as in Lunux and in FreeBSD ixgbe drivers:
+ * 1) When non-EOP RSC completion arrives:
+ *    a) Update the HEAD of the current RSC aggregation cluster with the new
+ *       segment's data length.
+ *    b) Set the "next" pointer of the current segment to point to the segment
+ *       at the NEXTP index.
+ *    c) Pass the HEAD of RSC aggregation cluster on to the next NEXTP entry
+ *       in the sw_rsc_ring.
+ * 2) When EOP arrives we just update the cluster's total length and offload
+ *    flags and deliver the cluster up to the upper layers. In our case - put it
+ *    in the rx_pkts table.
+ *
+ * Returns the number of received packets/clusters (according to the "bulk
+ * receive" interface).
+ */
+static inline uint16_t
+_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts,
+	       bool bulk_alloc)
+{
+	struct igb_rx_queue *rxq = rx_queue;
+	volatile union ixgbe_adv_rx_desc *rx_ring = rxq->rx_ring;
+	struct igb_rx_entry *sw_ring = rxq->sw_ring;
+	struct igb_rsc_entry *sw_rsc_ring = rxq->sw_rsc_ring;
+	uint16_t rx_id = rxq->rx_tail;
+	uint16_t nb_rx = 0;
+	uint16_t nb_hold = rxq->nb_rx_hold;
+	uint16_t prev_id = rxq->rx_tail;
+
+	while (nb_rx < nb_pkts) {
+		bool eop;
+		struct igb_rx_entry *rxe;
+		struct igb_rsc_entry *rsc_entry;
+		struct igb_rsc_entry *next_rsc_entry;
+		struct igb_rx_entry *next_rxe;
+		struct rte_mbuf *first_seg;
+		struct rte_mbuf *rxm;
+		struct rte_mbuf *nmb;
+		union ixgbe_adv_rx_desc rxd;
+		uint16_t data_len;
+		uint16_t next_id;
+		volatile union ixgbe_adv_rx_desc *rxdp;
+		uint32_t staterr;
+
+next_desc:
+		/*
+		 * The code in this whole file uses the volatile pointer to
+		 * ensure the read ordering of the status and the rest of the
+		 * descriptor fields (on the compiler level only!!!). This is so
+		 * UGLY - why not to just use the compiler barrier instead? DPDK
+		 * even has the rte_compiler_barrier() for that.
+		 *
+		 * But most importantly this is just wrong because this doesn't
+		 * ensure memory ordering in a general case at all. For
+		 * instance, DPDK is supposed to work on Power CPUs where
+		 * compiler barrier may just not be enough!
+		 *
+		 * I tried to write only this function properly to have a
+		 * starting point (as a part of an LRO/RSC series) but the
+		 * compiler cursed at me when I tried to cast away the
+		 * "volatile" from rx_ring (yes, it's volatile too!!!). So, I'm
+		 * keeping it the way it is for now.
+		 *
+		 * The code in this file is broken in so many other places and
+		 * will just not work on a big endian CPU anyway therefore the
+		 * lines below will have to be revisited together with the rest
+		 * of the ixgbe PMD.
+		 *
+		 * TODO:
+		 *    - Get rid of "volatile" crap and let the compiler do its
+		 *      job.
+		 *    - Use the proper memory barrier (rte_rmb()) to ensure the
+		 *      memory ordering below.
+		 */
+		rxdp = &rx_ring[rx_id];
+		staterr = rte_le_to_cpu_32(rxdp->wb.upper.status_error);
+
+		if (!(staterr & IXGBE_RXDADV_STAT_DD))
+			break;
+
+		rxd = *rxdp;
+
+		PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_id=%u "
+				  "staterr=0x%x data_len=%u",
+			   rxq->port_id, rxq->queue_id, rx_id, staterr,
+			   rte_le_to_cpu_16(rxd.wb.upper.length));
+
+		if (!bulk_alloc) {
+			nmb = rte_rxmbuf_alloc(rxq->mb_pool);
+			if (nmb == NULL) {
+				PMD_RX_LOG(DEBUG, "RX mbuf alloc failed "
+						  "port_id=%u queue_id=%u",
+					   rxq->port_id, rxq->queue_id);
+
+				rte_eth_devices[rxq->port_id].data->
+							rx_mbuf_alloc_failed++;
+				break;
+			}
+		} else if (nb_hold > rxq->rx_free_thresh) {
+			uint16_t next_rdt = rxq->rx_free_trigger;
+
+			if (!ixgbe_rx_alloc_bufs(rxq, false)) {
+				rte_wmb();
+				IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr,
+						    next_rdt);
+				nb_hold -= rxq->rx_free_thresh;
+			} else {
+				PMD_RX_LOG(DEBUG, "RX bulk alloc failed "
+						  "port_id=%u queue_id=%u",
+					   rxq->port_id, rxq->queue_id);
+
+				rte_eth_devices[rxq->port_id].data->
+							rx_mbuf_alloc_failed++;
+				break;
+			}
+		}
+
+		nb_hold++;
+		rxe = &sw_ring[rx_id];
+		eop = staterr & IXGBE_RXDADV_STAT_EOP;
+
+		next_id = rx_id + 1;
+		if (next_id == rxq->nb_rx_desc)
+			next_id = 0;
+
+		/* Prefetch next mbuf while processing current one. */
+		rte_ixgbe_prefetch(sw_ring[next_id].mbuf);
+
+		/*
+		 * When next RX descriptor is on a cache-line boundary,
+		 * prefetch the next 4 RX descriptors and the next 4 pointers
+		 * to mbufs.
+		 */
+		if ((next_id & 0x3) == 0) {
+			rte_ixgbe_prefetch(&rx_ring[next_id]);
+			rte_ixgbe_prefetch(&sw_ring[next_id]);
+		}
+
+		rxm = rxe->mbuf;
+
+		if (!bulk_alloc) {
+			__le64 dma =
+			  rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(nmb));
+			/*
+			 * Update RX descriptor with the physical address of the
+			 * new data buffer of the new allocated mbuf.
+			 */
+			rxe->mbuf = nmb;
+
+			rxm->data_off = RTE_PKTMBUF_HEADROOM;
+			rxdp->read.hdr_addr = dma;
+			rxdp->read.pkt_addr = dma;
+		}
+		/*
+		 * Set data length & data buffer address of mbuf.
+		 */
+		data_len = rte_le_to_cpu_16(rxd.wb.upper.length);
+		rxm->data_len = data_len;
+
+		if (!eop) {
+			uint16_t nextp_id;
+			/*
+			 * Get next descriptor index:
+			 *  - For RSC it's in the NEXTP field.
+			 *  - For a scattered packet - it's just a following
+			 *    descriptor.
+			 */
+			if (ixgbe_rsc_count(&rxd))
+				nextp_id =
+					(staterr & IXGBE_RXDADV_NEXTP_MASK) >>
+						       IXGBE_RXDADV_NEXTP_SHIFT;
+			else
+				nextp_id = next_id;
+
+			next_rsc_entry = &sw_rsc_ring[nextp_id];
+			next_rxe = &sw_ring[nextp_id];
+			rte_ixgbe_prefetch(next_rxe);
+		}
+
+		rsc_entry = &sw_rsc_ring[rx_id];
+		first_seg = rsc_entry->fbuf;
+		rsc_entry->fbuf = NULL;
+
+		/*
+		 * If this is the first buffer of the received packet,
+		 * set the pointer to the first mbuf of the packet and
+		 * initialize its context.
+		 * Otherwise, update the total length and the number of segments
+		 * of the current scattered packet, and update the pointer to
+		 * the last mbuf of the current packet.
+		 */
+		if (first_seg == NULL) {
+			first_seg = rxm;
+			first_seg->pkt_len = data_len;
+			first_seg->nb_segs = 1;
+		} else {
+			first_seg->pkt_len += data_len;
+			first_seg->nb_segs++;
+		}
+
+		prev_id = rx_id;
+		rx_id = next_id;
+
+		/*
+		 * If this is not the last buffer of the received packet, update
+		 * the pointer to the first mbuf at the NEXTP entry in the
+		 * sw_rsc_ring and continue to parse the RX ring.
+		 */
+		if (!eop) {
+			rxm->next = next_rxe->mbuf;
+			next_rsc_entry->fbuf = first_seg;
+			goto next_desc;
+		}
+
+		/*
+		 * This is the last buffer of the received packet - return
+		 * the current cluster to the user.
+		 */
+		rxm->next = NULL;
+
+		/* Initialize the first mbuf of the returned packet */
+		ixgbe_fill_cluster_head_buf(first_seg, &rxd, rxq->port_id,
+					    staterr);
+
+		/* Prefetch data of first segment, if configured to do so. */
+		rte_packet_prefetch((char *)first_seg->buf_addr +
+			first_seg->data_off);
+
+		/*
+		 * Store the mbuf address into the next entry of the array
+		 * of returned packets.
+		 */
+		rx_pkts[nb_rx++] = first_seg;
+	}
+
+	/*
+	 * Record index of the next RX descriptor to probe.
+	 */
+	rxq->rx_tail = rx_id;
+
+	/*
+	 * If the number of free RX descriptors is greater than the RX free
+	 * threshold of the queue, advance the Receive Descriptor Tail (RDT)
+	 * register.
+	 * Update the RDT with the value of the last processed RX descriptor
+	 * minus 1, to guarantee that the RDT register is never equal to the
+	 * RDH register, which creates a "full" ring situtation from the
+	 * hardware point of view...
+	 */
+	if (!bulk_alloc && nb_hold > rxq->rx_free_thresh) {
+		PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
+			   "nb_hold=%u nb_rx=%u",
+			   rxq->port_id, rxq->queue_id, rx_id, nb_hold, nb_rx);
+
+		IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, prev_id);
+		nb_hold = 0;
+	}
+
+	rxq->nb_rx_hold = nb_hold;
+	return nb_rx;
+}
+
+uint16_t
+ixgbe_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
+{
+	return _recv_pkts_lro(rx_queue, rx_pkts, nb_pkts, false);
+}
+
+uint16_t
+ixgbe_recv_pkts_lro_bulk_alloc(void *rx_queue, struct rte_mbuf **rx_pkts,
+			       uint16_t nb_pkts)
+{
+	return _recv_pkts_lro(rx_queue, rx_pkts, nb_pkts, true);
+}
+
 uint16_t
 ixgbe_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 			  uint16_t nb_pkts)
@@ -2022,6 +2316,7 @@ ixgbe_rx_queue_release(struct igb_rx_queue *rxq)
 	if (rxq != NULL) {
 		ixgbe_rx_queue_release_mbufs(rxq);
 		rte_free(rxq->sw_ring);
+		rte_free(rxq->sw_rsc_ring);
 		rte_free(rxq);
 	}
 }
@@ -2144,6 +2439,7 @@ ixgbe_reset_rx_queue(struct ixgbe_hw *hw, struct igb_rx_queue *rxq)
 	rxq->nb_rx_hold = 0;
 	rxq->pkt_first_seg = NULL;
 	rxq->pkt_last_seg = NULL;
+	rxq->rsc_en = 0;
 }
 
 int
@@ -2158,6 +2454,14 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	struct igb_rx_queue *rxq;
 	struct ixgbe_hw     *hw;
 	uint16_t len;
+	struct rte_eth_dev_info dev_info = { 0 };
+	struct rte_eth_rxmode *dev_rx_mode = &dev->data->dev_conf.rxmode;
+	bool rsc_requested = false;
+
+	dev->dev_ops->dev_infos_get(dev, &dev_info);
+	if ((dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_LRO) &&
+	    dev_rx_mode->enable_lro)
+		rsc_requested = true;
 
 	PMD_INIT_FUNC_TRACE();
 	hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
@@ -2261,12 +2565,28 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	rxq->sw_ring = rte_zmalloc_socket("rxq->sw_ring",
 					  sizeof(struct igb_rx_entry) * len,
 					  RTE_CACHE_LINE_SIZE, socket_id);
-	if (rxq->sw_ring == NULL) {
+	if (!rxq->sw_ring) {
 		ixgbe_rx_queue_release(rxq);
 		return (-ENOMEM);
 	}
-	PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64,
-		     rxq->sw_ring, rxq->rx_ring, rxq->rx_ring_phys_addr);
+
+	if (rsc_requested) {
+		rxq->sw_rsc_ring =
+			rte_zmalloc_socket("rxq->sw_rsc_ring",
+					   sizeof(struct igb_rsc_entry) * len,
+					   RTE_CACHE_LINE_SIZE, socket_id);
+		if (!rxq->sw_rsc_ring) {
+			ixgbe_rx_queue_release(rxq);
+			return (-ENOMEM);
+		}
+	} else {
+		rxq->sw_rsc_ring = NULL;
+	}
+
+	PMD_INIT_LOG(DEBUG, "sw_ring=%p sw_rsc_ring=%p hw_ring=%p "
+			    "dma_addr=0x%"PRIx64,
+		     rxq->sw_ring, rxq->sw_rsc_ring, rxq->rx_ring,
+		     rxq->rx_ring_phys_addr);
 
 	if (!rte_is_power_of_2(nb_desc)) {
 		PMD_INIT_LOG(DEBUG, "queue[%d] doesn't meet Vector Rx "
@@ -3511,6 +3831,84 @@ ixgbe_dev_mq_tx_configure(struct rte_eth_dev *dev)
 	return 0;
 }
 
+/**
+ * get_rscctl_maxdesc - Calculate the RSCCTL[n].MAXDESC for PF
+ *
+ * Return the RSCCTL[n].MAXDESC for 82599 and x540 PF devices according to the
+ * spec rev. 3.0 chapter 8.2.3.8.13.
+ *
+ * @pool Memory pool of the Rx queue
+ */
+static inline uint32_t get_rscctl_maxdesc(struct rte_mempool *pool)
+{
+	struct rte_pktmbuf_pool_private *mp_priv = rte_mempool_get_priv(pool);
+
+	/* MAXDESC * SRRCTL.BSIZEPKT must not exceed 64 KB minus one */
+	uint16_t maxdesc =
+		65535 / (mp_priv->mbuf_data_room_size - RTE_PKTMBUF_HEADROOM);
+
+	if (maxdesc >= 16)
+		return IXGBE_RSCCTL_MAXDESC_16;
+	else if (maxdesc >= 8)
+		return IXGBE_RSCCTL_MAXDESC_8;
+	else if (maxdesc >= 4)
+		return IXGBE_RSCCTL_MAXDESC_4;
+	else
+		return IXGBE_RSCCTL_MAXDESC_1;
+}
+
+/* (Taken from FreeBSD tree)
+** Setup the correct IVAR register for a particular MSIX interrupt
+**   (yes this is all very magic and confusing :)
+**  - entry is the register array entry
+**  - vector is the MSIX vector for this queue
+**  - type is RX/TX/MISC
+*/
+static void
+ixgbe_set_ivar(struct rte_eth_dev *dev, u8 entry, u8 vector, s8 type)
+{
+	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	u32 ivar, index;
+
+	vector |= IXGBE_IVAR_ALLOC_VAL;
+
+	switch (hw->mac.type) {
+
+	case ixgbe_mac_82598EB:
+		if (type == -1)
+			entry = IXGBE_IVAR_OTHER_CAUSES_INDEX;
+		else
+			entry += (type * 64);
+		index = (entry >> 2) & 0x1F;
+		ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(index));
+		ivar &= ~(0xFF << (8 * (entry & 0x3)));
+		ivar |= (vector << (8 * (entry & 0x3)));
+		IXGBE_WRITE_REG(hw, IXGBE_IVAR(index), ivar);
+		break;
+
+	case ixgbe_mac_82599EB:
+	case ixgbe_mac_X540:
+		if (type == -1) { /* MISC IVAR */
+			index = (entry & 1) * 8;
+			ivar = IXGBE_READ_REG(hw, IXGBE_IVAR_MISC);
+			ivar &= ~(0xFF << index);
+			ivar |= (vector << index);
+			IXGBE_WRITE_REG(hw, IXGBE_IVAR_MISC, ivar);
+		} else {	/* RX/TX IVARS */
+			index = (16 * (entry & 1)) + (8 * type);
+			ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(entry >> 1));
+			ivar &= ~(0xFF << index);
+			ivar |= (vector << index);
+			IXGBE_WRITE_REG(hw, IXGBE_IVAR(entry >> 1), ivar);
+		}
+
+		break;
+
+	default:
+		break;
+	}
+}
+
 void set_rx_function(struct rte_eth_dev *dev)
 {
 	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
@@ -3561,6 +3959,25 @@ void set_rx_function(struct rte_eth_dev *dev)
 			dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
 		}
 	}
+
+	/*
+	 * Initialize the appropriate LRO callback.
+	 *
+	 * If all queues satisfy the bulk allocation preconditions
+	 * (hw->rx_bulk_alloc_allowed is TRUE) then we may use bulk allocation.
+	 * Otherwise use a single allocation version.
+	 */
+	if (dev->data->lro) {
+		if (hw->rx_bulk_alloc_allowed) {
+			PMD_INIT_LOG(INFO, "LRO is requested. Using a bulk "
+					   "allocation version");
+			dev->rx_pkt_burst = ixgbe_recv_pkts_lro_bulk_alloc;
+		} else {
+			PMD_INIT_LOG(INFO, "LRO is requested. Using a single "
+					   "allocation version");
+			dev->rx_pkt_burst = ixgbe_recv_pkts_lro;
+		}
+	}
 }
 
 /*
@@ -3579,10 +3996,26 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	uint32_t maxfrs;
 	uint32_t srrctl;
 	uint32_t rdrxctl;
+	uint32_t rscctl;
+	uint32_t psrtype;
+	uint32_t rfctl;
 	uint32_t rxcsum;
 	uint16_t buf_size;
 	uint16_t i;
 	struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
+	struct rte_eth_dev_info dev_info = { 0 };
+	bool rsc_capable = false;
+
+	/* Sanity check */
+	dev->dev_ops->dev_infos_get(dev, &dev_info);
+	if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TCP_LRO)
+		rsc_capable = true;
+
+	if (!rsc_capable && rx_conf->enable_lro) {
+		PMD_INIT_LOG(CRIT, "LRO is requested on HW that doesn't "
+				   "support it");
+		return -EINVAL;
+	}
 
 	PMD_INIT_FUNC_TRACE();
 	hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
@@ -3602,13 +4035,44 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 	IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);
 
 	/*
+	 * RFCTL configuration
+	 *
+	 * Since NFS packets coalescing is not supported - clear RFCTL.NFSW_DIS
+	 * and RFCTL.NFSR_DIS when RSC is enabled.
+	 */
+	if (rsc_capable) {
+		rfctl = IXGBE_READ_REG(hw, IXGBE_RFCTL);
+		if (rx_conf->enable_lro) {
+			rfctl &= ~(IXGBE_RFCTL_RSC_DIS | IXGBE_RFCTL_NFSW_DIS |
+				   IXGBE_RFCTL_NFSR_DIS);
+		} else {
+			rfctl |= IXGBE_RFCTL_RSC_DIS;
+		}
+
+		IXGBE_WRITE_REG(hw, IXGBE_RFCTL, rfctl);
+	}
+
+
+	/*
 	 * Configure CRC stripping, if any.
 	 */
 	hlreg0 = IXGBE_READ_REG(hw, IXGBE_HLREG0);
 	if (rx_conf->hw_strip_crc)
 		hlreg0 |= IXGBE_HLREG0_RXCRCSTRP;
-	else
+	else {
 		hlreg0 &= ~IXGBE_HLREG0_RXCRCSTRP;
+		if (rx_conf->enable_lro) {
+			/*
+			 * According to chapter of 4.6.7.2.1 of the Spec Rev.
+			 * 3.0 RSC configuration requires HW CRC stripping being
+			 * enabled. If user requested both HW CRC stripping off
+			 * and RSC on - return an error.
+			 */
+			PMD_INIT_LOG(CRIT, "LRO can't be enabled when HW CRC "
+					    "is disabled");
+			return -EINVAL;
+		}
+	}
 
 	/*
 	 * Configure jumbo frame support, if any.
@@ -3660,9 +4124,18 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 		 * Configure Header Split
 		 */
 		if (rx_conf->header_split) {
+			/*
+			 * Print a warning if split_hdr_size is less
+			 * than 128 bytes when RSC is requested.
+			 */
+			if (rx_conf->enable_lro &&
+			    rx_conf->split_hdr_size < 128)
+				PMD_INIT_LOG(INFO, "split_hdr_size less than "
+						   "128 bytes (%d)!",
+					     rx_conf->split_hdr_size);
+
 			if (hw->mac.type == ixgbe_mac_82599EB) {
 				/* Must setup the PSRTYPE register */
-				uint32_t psrtype;
 				psrtype = IXGBE_PSRTYPE_TCPHDR |
 					IXGBE_PSRTYPE_UDPHDR   |
 					IXGBE_PSRTYPE_IPV4HDR  |
@@ -3675,7 +4148,20 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 			srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
 		} else
 #endif
+		{
 			srrctl = IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
+			/*
+			 * Following the 4.6.7.2.1 chapter of the 82599/x540
+			 * Spec if RSC is enabled the SRRCTL[n].BSIZEHEADER
+			 * should be configured even if header split is not
+			 * enabled. In the later case we will configure it 128
+			 * bytes following the recommendation in the spec.
+			 */
+			if (rx_conf->enable_lro)
+				srrctl |=
+				     ((128 << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
+						    IXGBE_SRRCTL_BSIZEHDR_MASK);
+		}
 
 		/* Set if packets are dropped when no descriptors available */
 		if (rxq->drop_en)
@@ -3692,6 +4178,13 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 				       RTE_PKTMBUF_HEADROOM);
 		srrctl |= ((buf_size >> IXGBE_SRRCTL_BSIZEPKT_SHIFT) &
 			   IXGBE_SRRCTL_BSIZEPKT_MASK);
+
+		/*
+		 * TODO: Consider setting the Receive Descriptor Minimum
+		 * Threshold Size for and RSC case. This is not an obviously
+		 * beneficiary option but the one worth considering...
+		 */
+
 		IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(rxq->reg_idx), srrctl);
 
 		buf_size = (uint16_t) ((srrctl & IXGBE_SRRCTL_BSIZEPKT_MASK) <<
@@ -3701,11 +4194,57 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 		if (dev->data->dev_conf.rxmode.max_rx_pkt_len +
 					    2 * IXGBE_VLAN_TAG_SIZE > buf_size)
 			dev->data->scattered_rx = 1;
+
+		/* RSC per-queue configuration */
+		if (rx_conf->enable_lro) {
+			uint32_t eitr;
+
+			rscctl =
+				IXGBE_READ_REG(hw, IXGBE_RSCCTL(rxq->reg_idx));
+			psrtype =
+				IXGBE_READ_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx));
+			eitr = IXGBE_READ_REG(hw, IXGBE_EITR(rxq->reg_idx));
+
+			rscctl |= IXGBE_RSCCTL_RSCEN;
+			rscctl |= get_rscctl_maxdesc(rxq->mb_pool);
+			psrtype |= IXGBE_PSRTYPE_TCPHDR;
+
+			/*
+			 * RSC: Set ITR interval corresponding to 2K ints/s.
+			 *
+			 * Full-sized RSC aggregations for a 10Gb/s link will
+			 * arrive at about 20K aggregation/s rate.
+			 *
+			 * 2K inst/s rate will make only 10% of the
+			 * aggregations to be closed due to the interrupt timer
+			 * expiration for a streaming at wire-speed case.
+			 *
+			 * For a sparse streaming case this setting will yield
+			 * at most 500us latency for a single RSC aggregation.
+			 */
+			eitr   |= (2000 | IXGBE_EITR_CNT_WDIS);
+
+			IXGBE_WRITE_REG(hw, IXGBE_RSCCTL(rxq->reg_idx), rscctl);
+			IXGBE_WRITE_REG(hw, IXGBE_PSRTYPE(rxq->reg_idx),
+								       psrtype);
+			IXGBE_WRITE_REG(hw, IXGBE_EITR(rxq->reg_idx), eitr);
+
+			/*
+			 * RSC requires the mapping of the queue to the
+			 * interrupt vector.
+			 */
+			ixgbe_set_ivar(dev, rxq->reg_idx, i, 0);
+
+			rxq->rsc_en = 1;
+		}
 	}
 
 	if (rx_conf->enable_scatter)
 		dev->data->scattered_rx = 1;
 
+	if (rx_conf->enable_lro)
+		dev->data->lro = 1;
+
 	set_rx_function(dev);
 
 	/*
@@ -3738,6 +4277,19 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 		IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl);
 	}
 
+	/* Finalize RSC configuration  */
+	if (rx_conf->enable_lro) {
+		/*
+		 * Follow the instructions in the 4.6.7.2.1 of the Spec Rev. 3.0
+		 */
+		rdrxctl = IXGBE_READ_REG(hw, IXGBE_RDRXCTL);
+		rdrxctl |= IXGBE_RDRXCTL_RSCACKC;
+		IXGBE_WRITE_REG(hw, IXGBE_RDRXCTL, rdrxctl);
+
+		PMD_INIT_LOG(INFO, "enabling LRO mode");
+	}
+
+
 	return 0;
 }
 
diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.h b/lib/librte_pmd_ixgbe/ixgbe_rxtx.h
index bbe5ff3..389173f 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.h
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.h
@@ -79,6 +79,10 @@ struct igb_rx_entry {
 	struct rte_mbuf *mbuf; /**< mbuf associated with RX descriptor. */
 };
 
+struct igb_rsc_entry {
+	struct rte_mbuf *fbuf; /**< First segment of the fragmented packet. */
+};
+
 /**
  * Structure associated with each descriptor of the TX ring of a TX queue.
  */
@@ -105,6 +109,7 @@ struct igb_rx_queue {
 	volatile uint32_t   *rdt_reg_addr; /**< RDT register address. */
 	volatile uint32_t   *rdh_reg_addr; /**< RDH register address. */
 	struct igb_rx_entry *sw_ring; /**< address of RX software ring. */
+	struct igb_rsc_entry *sw_rsc_ring; /**< address of RSC software ring. */
 	struct rte_mbuf *pkt_first_seg; /**< First segment of current packet. */
 	struct rte_mbuf *pkt_last_seg; /**< Last segment of current packet. */
 	uint64_t            mbuf_initializer; /**< value to init mbufs */
@@ -126,6 +131,7 @@ struct igb_rx_queue {
 	uint8_t             port_id;  /**< Device port identifier. */
 	uint8_t             crc_len;  /**< 0 if CRC stripped, 4 otherwise. */
 	uint8_t             drop_en;  /**< If not 0, set SRRCTL.Drop_En. */
+	uint8_t             rsc_en;   /**< If not 0, RSC is enabled. */
 	uint8_t             rx_deferred_start; /**< not in global dev start. */
 #ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
 	/** need to alloc dummy mbuf, for wraparound when scanning hw ring */
-- 
2.1.0

Re: [dpdk-dev] [PATCH v5 0/3]This series adds the missing flow for enabling the LRO in the ethdev and

[Vlad Zolotarov]

On 03/09/15 12:20, Vlad Zolotarov wrote:
> The series starts with some cleanup work in the code the final patch (the actual adding of
> the LRO support) is going to touch/use/change. There are still quite a few issues in the ixgbe
> PMD code left but they have to be a matter of a different series and I've left a few "TODO"
> remarks in the code.
>   
> The LRO ("RSC" in Intel's context) PMD completion handling code follows the same design as the
> corresponding Linux and FreeBSD implementation: pass the aggregation's cluster HEAD buffer to
> the NEXTP entry of the software ring till EOP is met.
>   
> HW configuration follows the corresponding specs: this feature is supported only by x540 and
> 82599 PF devices.
>   
> The feature has been tested with seastar TCP stack with the following configuration on Tx side:
>     - MTU: 400B
>     - 100 concurrent TCP connections.
>   
> The results were:
>     - Without LRO: total throughput: 0.12Gbps, coefficient of variance: 1.41%
>     - With LRO:    total throughput: 8.21Gbps, coefficient of variance: 0.59%
>   
> This is an almost factor 80 improvement.

Pls., note that this series is a followup series to the "bug fixes in 
the ixgbe PF PMD Rx flow" series I've sent before.

thanks,
vlad

>
> New in v5:
>     - Split the series into "bug fixes" and "all the rest" so that the former could be
>       integrated into a 2.0 release.
>     - Put the RTE_ETHDEV_HAS_LRO_SUPPORT definition at the beginning of rte_ethdev.h.
>     - Removed the "TODO: Remove me" comment near RTE_ETHDEV_HAS_LRO_SUPPORT.
>
> New in v4:
>     - Remove CONFIG_RTE_ETHDEV_LRO_SUPPORT from config/common_linuxapp.
>     - Define RTE_ETHDEV_HAS_LRO_SUPPORT in rte_ethdev.h.
>     - As a result of "ixgbe: check rxd number to avoid mbuf leak" (352078e8e) Vector Rx
>       had to get the same treatment as Rx Bulk Alloc (see PATCH4 for more details).
>       
> New in v3:
>     - ixgbe_rx_alloc_bufs(): Always reset refcnt of the buffers to 1. Otherwise rte_pktmbuf_free()
>       won't free them.
>
> New in v2:
>     - Removed rte_eth_dev_data.lro_bulk_alloc and added ixgbe_hw.rx_bulk_alloc_allowed
>       instead.
>     - Unified the rx_pkt_bulk callback setting (a separate new patch).
>     - Fixed a few styling and spelling issues.
>
>
> Vlad Zolotarov (3):
>    ixgbe: Cleanups
>    ixgbe: Code refactoring
>    ixgbe: Add LRO support
>
>   lib/librte_ether/rte_ethdev.h       |   9 +-
>   lib/librte_pmd_ixgbe/ixgbe_ethdev.c |   6 +
>   lib/librte_pmd_ixgbe/ixgbe_ethdev.h |   5 +
>   lib/librte_pmd_ixgbe/ixgbe_rxtx.c   | 703 ++++++++++++++++++++++++++++++++----
>   lib/librte_pmd_ixgbe/ixgbe_rxtx.h   |   6 +
>   5 files changed, 662 insertions(+), 67 deletions(-)
>