linux-kernel - Re: [PATCH net v3 3/3] octeon_ep_vf: ensure dbell BADDR updation

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Message-ID: <aWUHrqOpf-6hZqlu@horms.kernel.org>
Date: Mon, 12 Jan 2026 14:39:42 +0000
From: Simon Horman <horms@...nel.org>
To: Vimlesh Kumar <vimleshk@...vell.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	sedara@...vell.com, srasheed@...vell.com, hgani@...vell.com,
	Veerasenareddy Burru <vburru@...vell.com>,
	Satananda Burla <sburla@...vell.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"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 v3 3/3] octeon_ep_vf: ensure dbell BADDR updation

On Wed, Jan 07, 2026 at 01:18:56PM +0000, Vimlesh Kumar wrote:
> Make sure the OUT DBELL base address reflects the
> latest values written to it.
> 
> Fix:
> Add a wait until the OUT DBELL base address register
> is updated with the DMA ring descriptor address,
> and modify the setup_oq function to properly
> handle failures.
> 
> Fixes: 2c0c32c72be29 ("octeon_ep_vf: add hardware configuration APIs")
> Signed-off-by: Sathesh Edara <sedara@...vell.com>
> Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
> Signed-off-by: Vimlesh Kumar <vimleshk@...vell.com>
> ---
> V3:
> - Use reverse christmas tree order variable declaration.
> - Return error if timeout happens during setup oq.

...

> diff --git a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_rx.c b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_rx.c
> index d70c8be3cfc4..6446f6bf0b90 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_rx.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_rx.c
> @@ -171,7 +171,9 @@ static int octep_vf_setup_oq(struct octep_vf_device *oct, int q_no)
>  		goto oq_fill_buff_err;
>  
>  	octep_vf_oq_reset_indices(oq);
> -	oct->hw_ops.setup_oq_regs(oct, q_no);
> +	if (oct->hw_ops.setup_oq_regs(oct, q_no))
> +		goto oq_fill_buff_err;
> +

Hi Vimlesh, all,

I think that a new label needs to be added to the unwind ladder such that
octep_vf_oq_free_ring_buffers() is called if the error condition above is met.

Likewise in patch 2/3.

Flagged by Claude Code with Review Prompts[1]

[1] https://github.com/masoncl/review-prompts/

>  	oct->num_oqs++;
>  
>  	return 0;

-- 
pw-bot: cr