linux-kernel - Re: [net-next PATCH v3 02/14] net: dsa: qca8k: make mib autocast feature optional

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Message-ID: <62ddcf13.1c69fb81.9cb3a.d7a8@mx.google.com>
Date:   Sun, 24 Jul 2022 22:29:18 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [net-next PATCH v3 02/14] net: dsa: qca8k: make mib autocast
 feature optional

On Mon, Jul 25, 2022 at 01:33:48AM +0300, Vladimir Oltean wrote:
> On Sat, Jul 23, 2022 at 04:18:33PM +0200, Christian Marangi wrote:
> > Some switch may not support mib autocast feature and require the legacy
> > way of reading the regs directly.
> > Make the mib autocast feature optional and permit to declare support for
> > it using match_data struct in a dedicated qca8k_info_ops struct.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> >  drivers/net/dsa/qca/qca8k.c | 11 +++++++++--
> >  drivers/net/dsa/qca/qca8k.h |  5 +++++
> >  2 files changed, 14 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/dsa/qca/qca8k.c b/drivers/net/dsa/qca/qca8k.c
> > index 212b284f9f73..9820c5942d2a 100644
> > --- a/drivers/net/dsa/qca/qca8k.c
> > +++ b/drivers/net/dsa/qca/qca8k.c
> > @@ -2104,8 +2104,8 @@ qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
> >  	u32 hi = 0;
> >  	int ret;
> >  
> > -	if (priv->mgmt_master &&
> > -	    qca8k_get_ethtool_stats_eth(ds, port, data) > 0)
> > +	if (priv->mgmt_master && priv->info->ops.autocast_mib &&
> > +	    priv->info->ops.autocast_mib(ds, port, data) > 0)
> >  		return;
> >  
> >  	for (i = 0; i < priv->info->mib_count; i++) {
> > @@ -3248,20 +3248,27 @@ static int qca8k_resume(struct device *dev)
> >  static SIMPLE_DEV_PM_OPS(qca8k_pm_ops,
> >  			 qca8k_suspend, qca8k_resume);
> >  
> > +static const struct qca8k_info_ops qca8xxx_ops = {
> > +	.autocast_mib = qca8k_get_ethtool_stats_eth,
> > +};
> > +
> >  static const struct qca8k_match_data qca8327 = {
> >  	.id = QCA8K_ID_QCA8327,
> >  	.reduced_package = true,
> >  	.mib_count = QCA8K_QCA832X_MIB_COUNT,
> > +	.ops = qca8xxx_ops,
> >  };
> >  
> >  static const struct qca8k_match_data qca8328 = {
> >  	.id = QCA8K_ID_QCA8327,
> >  	.mib_count = QCA8K_QCA832X_MIB_COUNT,
> > +	.ops = qca8xxx_ops,
> >  };
> >  
> >  static const struct qca8k_match_data qca833x = {
> >  	.id = QCA8K_ID_QCA8337,
> >  	.mib_count = QCA8K_QCA833X_MIB_COUNT,
> > +	.ops = qca8xxx_ops,
> >  };
> >  
> >  static const struct of_device_id qca8k_of_match[] = {
> > diff --git a/drivers/net/dsa/qca/qca8k.h b/drivers/net/dsa/qca/qca8k.h
> > index 0b990b46890a..7b4a698f092a 100644
> > --- a/drivers/net/dsa/qca/qca8k.h
> > +++ b/drivers/net/dsa/qca/qca8k.h
> > @@ -324,10 +324,15 @@ enum qca8k_mid_cmd {
> >  	QCA8K_MIB_CAST = 3,
> >  };
> >  
> > +struct qca8k_info_ops {
> > +	int (*autocast_mib)(struct dsa_switch *ds, int port, u64 *data);
> > +};
> > +
> >  struct qca8k_match_data {
> >  	u8 id;
> >  	bool reduced_package;
> >  	u8 mib_count;
> > +	struct qca8k_info_ops ops;
> 
> This creates a copy of the structure for each of qca8327, qca8328, etc etc,
> which in turn will consume 3 times more space than necessary when new
> ops are added. Could you make this "const struct qca8k_ops *ops"?
> 

I already done this change in v4 as it was causing compilation error for
kernel test bot.

> >  };
> >  
> >  enum {
> > -- 
> > 2.36.1
> > 
> 

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