linux-kernel - Re: [PATCH net-next v2 2/9] octeon

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Date:   Wed, 30 Nov 2022 11:30:21 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Veerasenareddy Burru <vburru@...vell.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lironh@...vell.com, 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 v2 2/9] octeon_ep: poll for control messages

On Tue, Nov 29, 2022 at 05:09:25AM -0800, Veerasenareddy Burru wrote:
> Poll for control messages until interrupts are enabled.
> All the interrupts are enabled in ndo_open().

So what are you saying if I have your device and didn't enable network
device, you will poll forever?

> 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>
> ---
> 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..ace2dfd1e918 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)
>  {
> -	u64 mbox_int_val = 0ULL, val = 0ULL, qno = 0ULL;
> +	u64 reg0;
> +	int handled = 0;

Reversed Christmas tree.

Thanks