netdev - Re: [PATCH net-next v3 2/7] octeon_ep: poll for control messages

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Date:   Tue, 14 Feb 2023 18:42:54 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Veerasenareddy Burru <vburru@...vell.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <aayarekar@...vell.com>, <sedara@...vell.com>,
        <sburla@...vell.com>, <linux-doc@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v3 2/7] octeon_ep: poll for control messages

On Mon, Feb 13, 2023 at 09:14:17PM -0800, Veerasenareddy Burru wrote:
> Poll for control messages until interrupts are enabled.
> All the interrupts are enabled in ndo_open().
> Add ability to listen for notifications from firmware before ndo_open().
> Once interrupts are enabled, this polling is disabled and all the
> messages are processed by bottom half of interrupt handler.
> 
> Signed-off-by: Veerasenareddy Burru <vburru@...vell.com>
> Signed-off-by: Abhijit Ayarekar <aayarekar@...vell.com>

small two nits

> ---
> v2-> v3:
>  * resovled review comment; fixed reverse christmas tree.
> 
> v1 -> v2:
>  * removed device status oct->status, as it is not required with the
>    modified implementation in 0001-xxxx.patch
> 
>  .../marvell/octeon_ep/octep_cn9k_pf.c         | 49 +++++++++----------
>  .../ethernet/marvell/octeon_ep/octep_main.c   | 35 +++++++++++++
>  .../ethernet/marvell/octeon_ep/octep_main.h   | 11 ++++-
>  .../marvell/octeon_ep/octep_regs_cn9k_pf.h    |  4 ++
>  4 files changed, 71 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> index 6ad88d0fe43f..f40ebac15a79 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> @@ -352,27 +352,36 @@ static void octep_setup_mbox_regs_cn93_pf(struct octep_device *oct, int q_no)
>  	mbox->mbox_read_reg = oct->mmio[0].hw_addr + CN93_SDP_R_MBOX_VF_PF_DATA(q_no);
>  }
>  
> -/* Mailbox Interrupt handler */
> -static void cn93_handle_pf_mbox_intr(struct octep_device *oct)
> +/* Process non-ioq interrupts required to keep pf interface running.
> + * OEI_RINT is needed for control mailbox
> + */
> +static int octep_poll_non_ioq_interrupts_cn93_pf(struct octep_device *oct)

return bool?

>  {
> -	u64 mbox_int_val = 0ULL, val = 0ULL, qno = 0ULL;
> +	int handled = 0;
> +	u64 reg0;
>  
> -	mbox_int_val = readq(oct->mbox[0]->mbox_int_reg);
> -	for (qno = 0; qno < OCTEP_MAX_VF; qno++) {
> -		val = readq(oct->mbox[qno]->mbox_read_reg);
> -		dev_dbg(&oct->pdev->dev,
> -			"PF MBOX READ: val:%llx from VF:%llx\n", val, qno);
> +	/* Check for OEI INTR */
> +	reg0 = octep_read_csr64(oct, CN93_SDP_EPF_OEI_RINT);
> +	if (reg0) {
> +		dev_info(&oct->pdev->dev,
> +			 "Received OEI_RINT intr: 0x%llx\n",
> +			 reg0);
> +		octep_write_csr64(oct, CN93_SDP_EPF_OEI_RINT, reg0);
> +		if (reg0 & CN93_SDP_EPF_OEI_RINT_DATA_BIT_MBOX)
> +			queue_work(octep_wq, &oct->ctrl_mbox_task);
> +
> +		handled = 1;
>  	}
>  
> -	writeq(mbox_int_val, oct->mbox[0]->mbox_int_reg);
> +	return handled;
>  }
>  
>  /* Interrupts handler for all non-queue generic interrupts. */
>  static irqreturn_t octep_non_ioq_intr_handler_cn93_pf(void *dev)
>  {
>  	struct octep_device *oct = (struct octep_device *)dev;
> -	struct pci_dev *pdev = oct->pdev;
>  	u64 reg_val = 0;
> +	struct pci_dev *pdev = oct->pdev;

why this move of var and rct breakage?

>  	int i = 0;
>  
>  	/* Check for IRERR INTR */
> @@ -434,24 +443,9 @@ static irqreturn_t octep_non_ioq_intr_handler_cn93_pf(void *dev)
>  		goto irq_handled;
>  	}
>  
> -	/* Check for MBOX INTR */
> -	reg_val = octep_read_csr64(oct, CN93_SDP_EPF_MBOX_RINT(0));
> -	if (reg_val) {
> -		dev_info(&pdev->dev,
> -			 "Received MBOX_RINT intr: 0x%llx\n", reg_val);
> -		cn93_handle_pf_mbox_intr(oct);
> +	/* Check for MBOX INTR and OEI INTR */
> +	if (octep_poll_non_ioq_interrupts_cn93_pf(oct))
>  		goto irq_handled;
> -	}
> -
> -	/* Check for OEI INTR */
> -	reg_val = octep_read_csr64(oct, CN93_SDP_EPF_OEI_RINT);
> -	if (reg_val) {
> -		dev_info(&pdev->dev,
> -			 "Received OEI_EINT intr: 0x%llx\n", reg_val);
> -		octep_write_csr64(oct, CN93_SDP_EPF_OEI_RINT, reg_val);
> -		queue_work(octep_wq, &oct->ctrl_mbox_task);
> -		goto irq_handled;
> -	}
>  
>  	/* Check for DMA INTR */
>  	reg_val = octep_read_csr64(oct, CN93_SDP_EPF_DMA_RINT);
> @@ -712,6 +706,7 @@ void octep_device_setup_cn93_pf(struct octep_device *oct)
>  
>  	oct->hw_ops.enable_interrupts = octep_enable_interrupts_cn93_pf;
>  	oct->hw_ops.disable_interrupts = octep_disable_interrupts_cn93_pf;
> +	oct->hw_ops.poll_non_ioq_interrupts = octep_poll_non_ioq_interrupts_cn93_pf;
>  
>  	oct->hw_ops.update_iq_read_idx = octep_update_iq_read_index_cn93_pf;