[dpdk-dev,v2] i40e: fix the write back issue in FVL VF

  If DPDK is used on VF while the host is using Linux Kernel driver
as PF driver on FVL NIC, then VF Rx is reported only in batches of
4 packets. It is due to the kernel driver assumes VF driver is working
in interrupt mode, but DPDK VF is working in Polling mode.
This patch fixes this issue by using the V1.1 virtual channel with
Linux i40e PF driver.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
---
v2:
 fix coding style issue.

 drivers/net/i40e/i40e_ethdev.h    |  5 +++
 drivers/net/i40e/i40e_ethdev_vf.c | 65 +++++++++++++++++++++++++++++----------
 2 files changed, 53 insertions(+), 17 deletions(-)
  

Hi,

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Jingjing Wu
> Sent: Wednesday, October 21, 2015 10:18 AM
> To: dev@dpdk.org
> Cc: Pei, Yulong
> Subject: [dpdk-dev] [PATCH v2] i40e: fix the write back issue in FVL VF
> 
> If DPDK is used on VF while the host is using Linux Kernel driver
> as PF driver on FVL NIC, then VF Rx is reported only in batches of
> 4 packets. It is due to the kernel driver assumes VF driver is working
> in interrupt mode, but DPDK VF is working in Polling mode.
> This patch fixes this issue by using the V1.1 virtual channel with
> Linux i40e PF driver.
> 
> Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
> ---
> v2:
>  fix coding style issue.
> 
>  drivers/net/i40e/i40e_ethdev.h    |  5 +++
>  drivers/net/i40e/i40e_ethdev_vf.c | 65 +++++++++++++++++++++++++++++---
> -------
>  2 files changed, 53 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
> index 6185657..d42487d 100644
> --- a/drivers/net/i40e/i40e_ethdev.h
> +++ b/drivers/net/i40e/i40e_ethdev.h
> @@ -91,6 +91,11 @@
>  #define I40E_48_BIT_WIDTH (CHAR_BIT * 6)
>  #define I40E_48_BIT_MASK  RTE_LEN2MASK(I40E_48_BIT_WIDTH, uint64_t)
> 
> +/* Linux PF host with virtchnl version 1.1 */
> +#define PF_IS_V11(vf) \
> +	(((vf)->version_major == I40E_VIRTCHNL_VERSION_MAJOR) && \
> +	((vf)->version_minor == 1))
> +
>  /* index flex payload per layer */
>  enum i40e_flxpld_layer_idx {
>  	I40E_FLXPLD_L2_IDX    = 0,
> diff --git a/drivers/net/i40e/i40e_ethdev_vf.c
> b/drivers/net/i40e/i40e_ethdev_vf.c
> index b694400..1324281 100644
> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> @@ -67,12 +67,15 @@
>  #include "i40e_rxtx.h"
>  #include "i40e_ethdev.h"
>  #include "i40e_pf.h"
> -#define I40EVF_VSI_DEFAULT_MSIX_INTR 1
> +#define I40EVF_VSI_DEFAULT_MSIX_INTR     1
> +#define I40EVF_VSI_DEFAULT_MSIX_INTR_LNX 0
> 
>  /* busy wait delay in msec */
>  #define I40EVF_BUSY_WAIT_DELAY 10
>  #define I40EVF_BUSY_WAIT_COUNT 50
>  #define MAX_RESET_WAIT_CNT     20
> +/*ITR index for NOITR*/
> +#define I40E_QINT_RQCTL_MSIX_INDX_NOITR     3
> 
>  struct i40evf_arq_msg_info {
>  	enum i40e_virtchnl_ops ops;
> @@ -412,7 +415,7 @@ i40evf_check_api_version(struct rte_eth_dev *dev)
>  	if (vf->version_major == I40E_DPDK_VERSION_MAJOR)
>  		PMD_DRV_LOG(INFO, "Peer is DPDK PF host");
>  	else if ((vf->version_major == I40E_VIRTCHNL_VERSION_MAJOR) &&
> -		(vf->version_minor == I40E_VIRTCHNL_VERSION_MINOR))
> +		(vf->version_minor <= I40E_VIRTCHNL_VERSION_MINOR))
>  		PMD_DRV_LOG(INFO, "Peer is Linux PF host");
>  	else {
>  		PMD_INIT_LOG(ERR, "PF/VF API version mismatch:(%u.%u)-
> (%u.%u)",
> @@ -432,14 +435,23 @@ i40evf_get_vf_resource(struct rte_eth_dev *dev)
>  	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);
>  	int err;
>  	struct vf_cmd_info args;
> -	uint32_t len;
> +	uint32_t caps, len;
> 
>  	args.ops = I40E_VIRTCHNL_OP_GET_VF_RESOURCES;
> -	args.in_args = NULL;
> -	args.in_args_size = 0;
>  	args.out_buffer = cmd_result_buffer;
>  	args.out_size = I40E_AQ_BUF_SZ;
> -
> +	if (PF_IS_V11(vf)) {
> +		caps = I40E_VIRTCHNL_VF_OFFLOAD_L2 |
> +		       I40E_VIRTCHNL_VF_OFFLOAD_RSS_AQ |
> +		       I40E_VIRTCHNL_VF_OFFLOAD_RSS_REG |
> +		       I40E_VIRTCHNL_VF_OFFLOAD_VLAN |
> +		       I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING;
> +		args.in_args = (uint8_t *)&caps;
> +		args.in_args_size = sizeof(caps);
> +	} else {
> +		args.in_args = NULL;
> +		args.in_args_size = 0;
> +	}
>  	err = i40evf_execute_vf_cmd(dev, &args);
> 
>  	if (err) {
> @@ -703,11 +715,14 @@ i40evf_config_irq_map(struct rte_eth_dev *dev)
>  	int i, err;
>  	map_info = (struct i40e_virtchnl_irq_map_info *)cmd_buffer;
>  	map_info->num_vectors = 1;
> -	map_info->vecmap[0].rxitr_idx = RTE_LIBRTE_I40E_ITR_INTERVAL / 2;
> -	map_info->vecmap[0].txitr_idx = RTE_LIBRTE_I40E_ITR_INTERVAL / 2;
> +	map_info->vecmap[0].rxitr_idx = I40E_QINT_RQCTL_MSIX_INDX_NOITR;
>  	map_info->vecmap[0].vsi_id = vf->vsi_res->vsi_id;
>  	/* Alway use default dynamic MSIX interrupt */
> -	map_info->vecmap[0].vector_id = I40EVF_VSI_DEFAULT_MSIX_INTR;
> +	if (vf->version_major == I40E_DPDK_VERSION_MAJOR)
> +		map_info->vecmap[0].vector_id =
> I40EVF_VSI_DEFAULT_MSIX_INTR;
> +	else
> +		map_info->vecmap[0].vector_id =
> I40EVF_VSI_DEFAULT_MSIX_INTR_LNX;
> +
>  	/* Don't map any tx queue */
>  	map_info->vecmap[0].txq_map = 0;
>  	map_info->vecmap[0].rxq_map = 0;
> @@ -1546,18 +1561,36 @@ i40evf_tx_init(struct rte_eth_dev *dev)
>  }
> 
>  static inline void
> -i40evf_enable_queues_intr(struct i40e_hw *hw)
> +i40evf_enable_queues_intr(struct rte_eth_dev *dev)
>  {
> -	I40E_WRITE_REG(hw,
> I40E_VFINT_DYN_CTLN1(I40EVF_VSI_DEFAULT_MSIX_INTR - 1),
> +	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);
> +	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
> +
> +	if (vf->version_major == I40E_DPDK_VERSION_MAJOR)
> +		/* To support DPDK PF host */
> +		I40E_WRITE_REG(hw,
> +
> 	I40E_VFINT_DYN_CTLN1(I40EVF_VSI_DEFAULT_MSIX_INTR - 1),
>  			I40E_VFINT_DYN_CTLN1_INTENA_MASK |
>  			I40E_VFINT_DYN_CTLN_CLEARPBA_MASK);
> +	else
> +		/* To support Linux PF host */
> +		I40E_WRITE_REG(hw, I40E_VFINT_DYN_CTL01,
> +				I40E_VFINT_DYN_CTL01_INTENA_MASK |
> +				I40E_VFINT_DYN_CTL01_CLEARPBA_MASK);
>  }
> 
>  static inline void
> -i40evf_disable_queues_intr(struct i40e_hw *hw)
> +i40evf_disable_queues_intr(struct rte_eth_dev *dev)
>  {
> -	I40E_WRITE_REG(hw,
> I40E_VFINT_DYN_CTLN1(I40EVF_VSI_DEFAULT_MSIX_INTR - 1),
> +	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);
> +	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
> +
> +	if (vf->version_major == I40E_DPDK_VERSION_MAJOR)
> +		I40E_WRITE_REG(hw,
> +
> 	I40E_VFINT_DYN_CTLN1(I40EVF_VSI_DEFAULT_MSIX_INTR - 1),
>  			0);
> +	else
> +		I40E_WRITE_REG(hw, I40E_VFINT_DYN_CTL01, 0);
>  }
> 
>  static int
> @@ -1604,7 +1637,7 @@ i40evf_dev_start(struct rte_eth_dev *dev)
>  		goto err_mac;
>  	}
> 
> -	i40evf_enable_queues_intr(hw);
> +	i40evf_enable_queues_intr(dev);
>  	return 0;
> 
>  err_mac:
> @@ -1616,11 +1649,9 @@ err_queue:
>  static void
>  i40evf_dev_stop(struct rte_eth_dev *dev)
>  {
> -	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
> -
>  	PMD_INIT_FUNC_TRACE();
> 
> -	i40evf_disable_queues_intr(hw);
> +	i40evf_disable_queues_intr(dev);
>  	i40evf_stop_queues(dev);
>  	i40e_dev_clear_queues(dev);
>  }
> --
> 2.4.0
Acked-by: Cunming Liang <cunming.liang@intel.com>
  

> -----Original Message-----
> From: Wu, Jingjing
> Sent: Wednesday, October 21, 2015 10:18 AM
> To: dev@dpdk.org
> Cc: Wu, Jingjing; Zhang, Helin; Pei, Yulong
> Subject: [PATCH v2] i40e: fix the write back issue in FVL VF
> 
> If DPDK is used on VF while the host is using Linux Kernel driver as PF driver on
> FVL NIC, then VF Rx is reported only in batches of
> 4 packets. It is due to the kernel driver assumes VF driver is working in interrupt
> mode, but DPDK VF is working in Polling mode.
> This patch fixes this issue by using the V1.1 virtual channel with Linux i40e PF
> driver.
> 
> Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
  

> > If DPDK is used on VF while the host is using Linux Kernel driver as PF driver on
> > FVL NIC, then VF Rx is reported only in batches of
> > 4 packets. It is due to the kernel driver assumes VF driver is working in interrupt
> > mode, but DPDK VF is working in Polling mode.
> > This patch fixes this issue by using the V1.1 virtual channel with Linux i40e PF
> > driver.
> > 
> > Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
> Acked-by: Helin Zhang <helin.zhang@intel.com>

Applied, thanks