netdev - Re: [PATCH net-next,2/3] octeontx2-af: Add support for CPT1 in debugfs

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Date:   Thu, 14 Jan 2021 15:50:43 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Srujana Challa <schalla@...vell.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org, sgoutham@...vell.com,
        gakula@...vell.com, sbhatta@...vell.com, schandran@...vell.com,
        pathreya@...vell.com, jerinj@...vell.com,
        Mahipal Challa <mchalla@...vell.com>
Subject: Re: [PATCH net-next,2/3] octeontx2-af: Add support for CPT1 in
 debugfs

On Wed, 2021-01-13 at 20:50 +0530, Srujana Challa wrote:
> Adds support to display block CPT1 stats at
> "/sys/kernel/debug/octeontx2/cpt1".
> 
> Signed-off-by: Mahipal Challa <mchalla@...vell.com>
> Signed-off-by: Srujana Challa <schalla@...vell.com>
> ---
>  .../marvell/octeontx2/af/rvu_debugfs.c        | 45 +++++++++++----
> ----
>  1 file changed, 26 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
> b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
> index d27543c1a166..158876366dd3 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
> @@ -1904,6 +1904,18 @@ static void rvu_dbg_npc_init(struct rvu *rvu)
>  }
>  
>  /* CPT debugfs APIs */
> +static int cpt_get_blkaddr(struct seq_file *filp)
> +{
> +	struct dentry *current_dir;
> +	int blkaddr;
> +
> +	current_dir = filp->file->f_path.dentry->d_parent;
> +	blkaddr = (!strcmp(current_dir->d_name.name, "cpt1") ?
> +			   BLKADDR_CPT1 : BLKADDR_CPT0);
> +

This is very fragile piece of code! it assumes static debugfs directory
structure and naming, why don't you store the CPT context in the
sqe_file private ? as you already have in rvu_dbg_nix_init  for nix_hw
type