Re: [dpdk-dev] [RFC PATCH v3 3/3] drivers/net: use unmask API in interrupt handlers

["Hyong Youb Kim (hyonkim)" <hyonkim@cisco.com>]

> -----Original Message-----
> From: Nithin Dabilpuram <ndabilpuram@marvell.com>
> Sent: Wednesday, July 17, 2019 1:44 AM
[...]
> Subject: [RFC PATCH v3 3/3] drivers/net: use unmask API in interrupt
> handlers
> 
> Replace rte_intr_enable() with rte_intr_unmask() API
> for unmasking in interrupt handlers and rx_queue_intr_enable()
> in callbacks of PMD's whose original intent was to unmask interrupts
> after handling is completed if device is backed by UIO, IGB_UIO or
> VFIO(with INTx).
> 
> Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
> ---
> 
> v3:
> * Change all PMD's that use rte_intr_enable() in
>   rx_queue_intr_enable() or in irq handler to use
>   new unmask api.
> 
>  drivers/net/atlantic/atl_ethdev.c    |  2 +-
>  drivers/net/avp/avp_ethdev.c         |  2 +-
>  drivers/net/axgbe/axgbe_ethdev.c     |  4 ++--
>  drivers/net/bnx2x/bnx2x_ethdev.c     |  2 +-
>  drivers/net/e1000/em_ethdev.c        |  4 ++--
>  drivers/net/e1000/igb_ethdev.c       |  6 +++---
>  drivers/net/fm10k/fm10k_ethdev.c     |  6 +++---
>  drivers/net/i40e/i40e_ethdev.c       |  2 +-
>  drivers/net/iavf/iavf_ethdev.c       |  2 +-
>  drivers/net/ice/ice_ethdev.c         |  4 ++--
>  drivers/net/ixgbe/ixgbe_ethdev.c     |  6 +++---
>  drivers/net/nfp/nfp_net.c            |  2 +-
>  drivers/net/qede/qede_ethdev.c       |  8 ++++----
>  drivers/net/sfc/sfc_intr.c           |  4 ++--
>  drivers/net/virtio/virtio_ethdev.c   | 16 +++++++++++++++-
>  drivers/net/vmxnet3/vmxnet3_ethdev.c |  2 +-
>  16 files changed, 43 insertions(+), 29 deletions(-)
> 
[...]
> diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
> index 1a7aa17..5484d31 100644
> --- a/drivers/net/nfp/nfp_net.c
> +++ b/drivers/net/nfp/nfp_net.c
> @@ -1412,7 +1412,7 @@ nfp_net_irq_unmask(struct rte_eth_dev *dev)
>  	if (hw->ctrl & NFP_NET_CFG_CTRL_MSIXAUTO) {
>  		/* If MSI-X auto-masking is used, clear the entry */
>  		rte_wmb();
> -		rte_intr_enable(&pci_dev->intr_handle);
> +		rte_intr_unmask(&pci_dev->intr_handle);

I mentioned this part earlier. The comment suggests the driver really
needs to clear Mask bit in MSI-X Table, if MSI-X is used?
rte_intr_unmask() + vfio-pci does not do that. The maintainers should
say something..

[...]
> diff --git a/drivers/net/qede/qede_ethdev.c
> b/drivers/net/qede/qede_ethdev.c
> index 82363e6..6648139 100644
> --- a/drivers/net/qede/qede_ethdev.c
> +++ b/drivers/net/qede/qede_ethdev.c
> @@ -248,8 +248,8 @@ qede_interrupt_handler_intx(void *param)
>  	if (status & 0x1) {
>  		qede_interrupt_action(ECORE_LEADING_HWFN(edev));
> 
> -		if (rte_intr_enable(eth_dev->intr_handle))
> -			DP_ERR(edev, "rte_intr_enable failed\n");
> +		if (rte_intr_unmask(eth_dev->intr_handle))
> +			DP_ERR(edev, "rte_intr_unmask failed\n");
>  	}
>  }
> 
> @@ -261,8 +261,8 @@ qede_interrupt_handler(void *param)
>  	struct ecore_dev *edev = &qdev->edev;
> 
>  	qede_interrupt_action(ECORE_LEADING_HWFN(edev));
> -	if (rte_intr_enable(eth_dev->intr_handle))
> -		DP_ERR(edev, "rte_intr_enable failed\n");
> +	if (rte_intr_unmask(eth_dev->intr_handle))
> +		DP_ERR(edev, "rte_intr_unmask failed\n");
>  }

I thought you were going to remove rte_intr_enable from this handler
altogether.

[...]

Thanks.
-Hyong