Re: [dpdk-dev] [PATCH 16/18] fm10k: add PF and VF interrupt handling function

[Neil Horman <nhorman@tuxdriver.com>]

On Fri, Jan 30, 2015 at 01:07:32PM +0800, Chen Jing D(Mark) wrote:
> From: Jeff Shaw <jeffrey.b.shaw@intel.com>
> 
> 1. Add 2 interrupt handling functions, one for PF and one for VF.
> 2. Enable interrupt after completing initialization of NIC.
> 
This seems to do way more than enable interrupt handling.  Can you be a bit more
desriptive here?
Neil

> Signed-off-by: Jeff Shaw <jeffrey.b.shaw@intel.com>
> Signed-off-by: Chen Jing D(Mark) <jing.d.chen@intel.com>
> ---
>  lib/librte_pmd_fm10k/fm10k_ethdev.c |  268 +++++++++++++++++++++++++++++++++++
>  1 files changed, 268 insertions(+), 0 deletions(-)
> 
> diff --git a/lib/librte_pmd_fm10k/fm10k_ethdev.c b/lib/librte_pmd_fm10k/fm10k_ethdev.c
> index 40e3a2b..685fa8f 100644
> --- a/lib/librte_pmd_fm10k/fm10k_ethdev.c
> +++ b/lib/librte_pmd_fm10k/fm10k_ethdev.c
> @@ -1325,6 +1325,256 @@ fm10k_rss_hash_conf_get(struct rte_eth_dev *dev,
>  	return 0;
>  }
>  
> +static void
> +fm10k_dev_enable_intr_pf(struct rte_eth_dev *dev)
> +{
> +	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> +	uint32_t int_map = FM10K_INT_MAP_IMMEDIATE;
> +
> +	/* Bind all local non-queue interrupt to vector 0 */
> +	int_map |= 0;
> +
> +	FM10K_WRITE_REG(hw, FM10K_INT_MAP(fm10k_int_Mailbox), int_map);
> +	FM10K_WRITE_REG(hw, FM10K_INT_MAP(fm10k_int_PCIeFault), int_map);
> +	FM10K_WRITE_REG(hw, FM10K_INT_MAP(fm10k_int_SwitchUpDown), int_map);
> +	FM10K_WRITE_REG(hw, FM10K_INT_MAP(fm10k_int_SwitchEvent), int_map);
> +	FM10K_WRITE_REG(hw, FM10K_INT_MAP(fm10k_int_SRAM), int_map);
> +	FM10K_WRITE_REG(hw, FM10K_INT_MAP(fm10k_int_VFLR), int_map);
> +
> +	/* Enable misc causes */
> +	FM10K_WRITE_REG(hw, FM10K_EIMR, FM10K_EIMR_ENABLE(PCA_FAULT) |
> +				FM10K_EIMR_ENABLE(THI_FAULT) |
> +				FM10K_EIMR_ENABLE(FUM_FAULT) |
> +				FM10K_EIMR_ENABLE(MAILBOX) |
> +				FM10K_EIMR_ENABLE(SWITCHREADY) |
> +				FM10K_EIMR_ENABLE(SWITCHNOTREADY) |
> +				FM10K_EIMR_ENABLE(SRAMERROR) |
> +				FM10K_EIMR_ENABLE(VFLR));
> +
> +	/* Enable ITR 0 */
> +	FM10K_WRITE_REG(hw, FM10K_ITR(0), FM10K_ITR_AUTOMASK |
> +					FM10K_ITR_MASK_CLEAR);
> +	FM10K_WRITE_FLUSH(hw);
> +}
> +
> +static void
> +fm10k_dev_enable_intr_vf(struct rte_eth_dev *dev)
> +{
> +	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> +	uint32_t int_map = FM10K_INT_MAP_IMMEDIATE;
> +
> +	/* Bind all local non-queue interrupt to vector 0 */
> +	int_map |= 0;
> +
> +	/* Only INT 0 availiable, other 15 are reserved. */
> +	FM10K_WRITE_REG(hw, FM10K_VFINT_MAP, int_map);
> +
> +	/* Enable ITR 0 */
> +	FM10K_WRITE_REG(hw, FM10K_VFITR(0), FM10K_ITR_AUTOMASK |
> +					FM10K_ITR_MASK_CLEAR);
> +	FM10K_WRITE_FLUSH(hw);
> +}
> +
> +static int
> +fm10k_dev_handle_fault(struct fm10k_hw *hw, uint32_t eicr)
> +{
> +	struct fm10k_fault fault;
> +	int err;
> +	const char *estr = "Unknown error";
> +
> +	/* Process PCA fault */
> +	if (eicr & FM10K_EIMR_PCA_FAULT) {
> +		err = fm10k_get_fault(hw, FM10K_PCA_FAULT, &fault);
> +		if (err)
> +			goto error;
> +		switch (fault.type) {
> +		case PCA_NO_FAULT:
> +			estr = "PCA_NO_FAULT"; break;
> +		case PCA_UNMAPPED_ADDR:
> +			estr = "PCA_UNMAPPED_ADDR"; break;
> +		case PCA_BAD_QACCESS_PF:
> +			estr = "PCA_BAD_QACCESS_PF"; break;
> +		case PCA_BAD_QACCESS_VF:
> +			estr = "PCA_BAD_QACCESS_VF"; break;
> +		case PCA_MALICIOUS_REQ:
> +			estr = "PCA_MALICIOUS_REQ"; break;
> +		case PCA_POISONED_TLP:
> +			estr = "PCA_POISONED_TLP"; break;
> +		case PCA_TLP_ABORT:
> +			estr = "PCA_TLP_ABORT"; break;
> +		default:
> +			goto error;
> +		}
> +		PMD_LOG(ERR, "%s: %s(%d) Addr:0x%"PRIu64" Spec: 0x%x",
> +			estr, fault.func ? "VF" : "PF", fault.func,
> +			fault.address, fault.specinfo);
> +	}
> +
> +	/* Process THI fault */
> +	if (eicr & FM10K_EIMR_THI_FAULT) {
> +		err = fm10k_get_fault(hw, FM10K_THI_FAULT, &fault);
> +		if (err)
> +			goto error;
> +		switch (fault.type) {
> +		case THI_NO_FAULT:
> +			estr = "THI_NO_FAULT"; break;
> +		case THI_MAL_DIS_Q_FAULT:
> +			estr = "THI_MAL_DIS_Q_FAULT"; break;
> +		default:
> +			goto error;
> +		}
> +		PMD_LOG(ERR, "%s: %s(%d) Addr:0x%"PRIu64" Spec: 0x%x",
> +			estr, fault.func ? "VF" : "PF", fault.func,
> +			fault.address, fault.specinfo);
> +	}
> +
> +	/* Process FUM fault */
> +	if (eicr & FM10K_EIMR_FUM_FAULT) {
> +		err = fm10k_get_fault(hw, FM10K_FUM_FAULT, &fault);
> +		if (err)
> +			goto error;
> +		switch (fault.type) {
> +		case FUM_NO_FAULT:
> +			estr = "FUM_NO_FAULT"; break;
> +		case FUM_UNMAPPED_ADDR:
> +			estr = "FUM_UNMAPPED_ADDR"; break;
> +		case FUM_POISONED_TLP:
> +			estr = "FUM_POISONED_TLP"; break;
> +		case FUM_BAD_VF_QACCESS:
> +			estr = "FUM_BAD_VF_QACCESS"; break;
> +		case FUM_ADD_DECODE_ERR:
> +			estr = "FUM_ADD_DECODE_ERR"; break;
> +		case FUM_RO_ERROR:
> +			estr = "FUM_RO_ERROR"; break;
> +		case FUM_QPRC_CRC_ERROR:
> +			estr = "FUM_QPRC_CRC_ERROR"; break;
> +		case FUM_CSR_TIMEOUT:
> +			estr = "FUM_CSR_TIMEOUT"; break;
> +		case FUM_INVALID_TYPE:
> +			estr = "FUM_INVALID_TYPE"; break;
> +		case FUM_INVALID_LENGTH:
> +			estr = "FUM_INVALID_LENGTH"; break;
> +		case FUM_INVALID_BE:
> +			estr = "FUM_INVALID_BE"; break;
> +		case FUM_INVALID_ALIGN:
> +			estr = "FUM_INVALID_ALIGN"; break;
> +		default:
> +			goto error;
> +		}
> +		PMD_LOG(ERR, "%s: %s(%d) Addr:0x%"PRIu64" Spec: 0x%x",
> +			estr, fault.func ? "VF" : "PF", fault.func,
> +			fault.address, fault.specinfo);
> +	}
> +
> +	if (estr)
> +		return 0;
> +	return 0;
> +error:
> +	PMD_LOG(ERR, "Failed to handle fault event.");
> +	return err;
> +}
> +
> +/**
> + * PF interrupt handler triggered by NIC for handling specific interrupt.
> + *
> + * @param handle
> + *  Pointer to interrupt handle.
> + * @param param
> + *  The address of parameter (struct rte_eth_dev *) regsitered before.
> + *
> + * @return
> + *  void
> + */
> +static void
> +fm10k_dev_interrupt_handler_pf(
> +			__rte_unused struct rte_intr_handle *handle,
> +			void *param)
> +{
> +	struct rte_eth_dev *dev = (struct rte_eth_dev *)param;
> +	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> +	uint32_t cause, status;
> +
> +	if (hw->mac.type != fm10k_mac_pf)
> +		return;
> +
> +	cause = FM10K_READ_REG(hw, FM10K_EICR);
> +
> +	/* Handle PCI fault cases */
> +	if (cause & FM10K_EICR_FAULT_MASK) {
> +		PMD_LOG(ERR, "INT: find fault!");
> +		fm10k_dev_handle_fault(hw, cause);
> +	}
> +
> +	/* Handle switch up/down */
> +	if (cause & FM10K_EICR_SWITCHNOTREADY)
> +		PMD_LOG(ERR, "INT: Switch is not ready");
> +
> +	if (cause & FM10K_EICR_SWITCHREADY)
> +		PMD_LOG(ERR, "INT: Switch is ready");
> +
> +	/* Handle mailbox message */
> +	fm10k_mbx_lock(hw);
> +	hw->mbx.ops.process(hw, &hw->mbx);
> +	fm10k_mbx_unlock(hw);
> +
> +	/* Handle SRAM error */
> +	if (cause & FM10K_EICR_SRAMERROR) {
> +		PMD_LOG(ERR, "INT: SRAM error on PEP");
> +
> +		status = FM10K_READ_REG(hw, FM10K_SRAM_IP);
> +		/* Write to clear pending bits */
> +		FM10K_WRITE_REG(hw, FM10K_SRAM_IP, status);
> +
> +		/* Todo: print out error message after shared code  updates */
> +	}
> +
> +	/* Clear these 3 events if having any */
> +	cause &= FM10K_EICR_SWITCHNOTREADY | FM10K_EICR_MAILBOX |
> +		 FM10K_EICR_SWITCHREADY;
> +	if (cause)
> +		FM10K_WRITE_REG(hw, FM10K_EICR, cause);
> +
> +	/* Re-enable interrupt from device side */
> +	FM10K_WRITE_REG(hw, FM10K_ITR(0), FM10K_ITR_AUTOMASK |
> +					FM10K_ITR_MASK_CLEAR);
> +	/* Re-enable interrupt from host side */
> +	rte_intr_enable(&(dev->pci_dev->intr_handle));
> +}
> +
> +/**
> + * VF interrupt handler triggered by NIC for handling specific interrupt.
> + *
> + * @param handle
> + *  Pointer to interrupt handle.
> + * @param param
> + *  The address of parameter (struct rte_eth_dev *) regsitered before.
> + *
> + * @return
> + *  void
> + */
> +static void
> +fm10k_dev_interrupt_handler_vf(
> +			__rte_unused struct rte_intr_handle *handle,
> +			void *param)
> +{
> +	struct rte_eth_dev *dev = (struct rte_eth_dev *)param;
> +	struct fm10k_hw *hw = FM10K_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> +
> +	if (hw->mac.type != fm10k_mac_vf)
> +		return;
> +
> +	/* Handle mailbox message if lock is acquired */
> +	fm10k_mbx_lock(hw);
> +	hw->mbx.ops.process(hw, &hw->mbx);
> +	fm10k_mbx_unlock(hw);
> +
> +	/* Re-enable interrupt from device side */
> +	FM10K_WRITE_REG(hw, FM10K_VFITR(0), FM10K_ITR_AUTOMASK |
> +					FM10K_ITR_MASK_CLEAR);
> +	/* Re-enable interrupt from host side */
> +	rte_intr_enable(&(dev->pci_dev->intr_handle));
> +}
> +
>  /* Mailbox message handler in VF */
>  static const struct fm10k_msg_data fm10k_msgdata_vf[] = {
>  	FM10K_TLV_MSG_TEST_HANDLER(fm10k_tlv_msg_test),
> @@ -1503,6 +1753,21 @@ eth_fm10k_dev_init(__rte_unused struct eth_driver *eth_drv,
>  		return -EIO;
>  	}
>  
> +	/*PF/VF has different interrupt handling mechanism */
> +	if (hw->mac.type == fm10k_mac_pf) {
> +		/* register callback func to eal lib */
> +		rte_intr_callback_register(&(dev->pci_dev->intr_handle),
> +			fm10k_dev_interrupt_handler_pf, (void *)dev);
> +
> +		/* enable MISC interrupt */
> +		fm10k_dev_enable_intr_pf(dev);
> +	} else { /* VF */
> +		rte_intr_callback_register(&(dev->pci_dev->intr_handle),
> +			fm10k_dev_interrupt_handler_vf, (void *)dev);
> +
> +		fm10k_dev_enable_intr_vf(dev);
> +	}
> +
>  	/*
>  	 * Below function will trigger operations on mailbox, acquire lock to
>  	 * avoid race condition from interrupt handler. Operations on mailbox
> @@ -1532,6 +1797,9 @@ eth_fm10k_dev_init(__rte_unused struct eth_driver *eth_drv,
>  
>  	fm10k_mbx_unlock(hw);
>  
> +	/* enable uio intr after callback registered */
> +	rte_intr_enable(&(dev->pci_dev->intr_handle));
> +
>  	return 0;
>  }
>  
> -- 
> 1.7.7.6
> 
>