linux-kernel - Re: [net-next PATCH v2 9/9] net: dsa: qca8k: add support for mdb

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Date:   Mon, 22 Nov 2021 03:48:21 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Ansuel Smith <ansuelsmth@...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>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v2 9/9] net: dsa: qca8k: add support for
 mdb_add/del

On Mon, Nov 22, 2021 at 02:03:13AM +0100, Ansuel Smith wrote:
> Add support for mdb add/del function. The ARL table is used to insert
> the rule. The rule will be searched, deleted and reinserted with the
> port mask updated. The function will check if the rule has to be updated
> or insert directly with no deletion of the old rule.
> If every port is removed from the port mask, the rule is removed.
> The rule is set STATIC in the ARL table (aka it doesn't age) to not be
> flushed by fast age function.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  drivers/net/dsa/qca8k.c | 97 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 97 insertions(+)
> 
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index 21a7f1ed7a5c..e37528c8dbf2 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -417,6 +417,79 @@ qca8k_fdb_flush(struct qca8k_priv *priv)
>  	mutex_unlock(&priv->reg_mutex);
>  }
>  
> +static int
> +qca8k_fdb_search_and_insert(struct qca8k_priv *priv, u8 port_mask, const u8 *mac, u16 vid)

FYI the networking tree is still sticking to its guns w.r.t. the 80
character per line limit. You can ignore the rule if you want to and it
makes sense, for example if you're printing a long string on nearby
lines (which shouldn't be split into multiple lines, because people grep
for error messages) and therefore it wouldn't look so out of place to
also have lines that are a bit longer. But in this case, the function
prototypes are sticking out like a sore thumb IMO, the nearby lines are
short otherwise.

And to be honest I don't understand your choice of where to split the
line either, this consumes two lines too, but doesn't exceed 80 characters:

static int qca8k_fdb_search_and_insert(struct qca8k_priv *priv, u8 port_mask,
				       const u8 *mac, u16 vid)

Otherwise:

Reviewed-by: Vladimir Oltean <olteanv@...il.com>

> +{
> +	struct qca8k_fdb fdb = { 0 };
> +	int ret;
> +
> +	mutex_lock(&priv->reg_mutex);
> +
> +	qca8k_fdb_write(priv, vid, 0, mac, 0);
> +	ret = qca8k_fdb_access(priv, QCA8K_FDB_SEARCH, -1);
> +	if (ret < 0)
> +		goto exit;
> +
> +	ret = qca8k_fdb_read(priv, &fdb);
> +	if (ret < 0)
> +		goto exit;
> +
> +	/* Rule exist. Delete first */
> +	if (!fdb.aging) {
> +		ret = qca8k_fdb_access(priv, QCA8K_FDB_PURGE, -1);
> +		if (ret)
> +			goto exit;
> +	}
> +
> +	/* Add port to fdb portmask */
> +	fdb.port_mask |= port_mask;
> +
> +	qca8k_fdb_write(priv, vid, fdb.port_mask, mac, fdb.aging);
> +	ret = qca8k_fdb_access(priv, QCA8K_FDB_LOAD, -1);
> +
> +exit:
> +	mutex_unlock(&priv->reg_mutex);
> +	return ret;
> +}
> +
> +static int
> +qca8k_fdb_search_and_del(struct qca8k_priv *priv, u8 port_mask, const u8 *mac, u16 vid)
> +{
> +	struct qca8k_fdb fdb = { 0 };
> +	int ret;
> +
> +	mutex_lock(&priv->reg_mutex);
> +
> +	qca8k_fdb_write(priv, vid, 0, mac, 0);
> +	ret = qca8k_fdb_access(priv, QCA8K_FDB_SEARCH, -1);
> +	if (ret < 0)
> +		goto exit;
> +
> +	/* Rule doesn't exist. Why delete? */
> +	if (!fdb.aging) {
> +		ret = -EINVAL;
> +		goto exit;
> +	}
> +
> +	ret = qca8k_fdb_access(priv, QCA8K_FDB_PURGE, -1);
> +	if (ret)
> +		goto exit;
> +
> +	/* Only port in the rule is this port. Don't re insert */
> +	if (fdb.port_mask == port_mask)
> +		goto exit;
> +
> +	/* Remove port from port mask */
> +	fdb.port_mask &= ~port_mask;
> +
> +	qca8k_fdb_write(priv, vid, fdb.port_mask, mac, fdb.aging);
> +	ret = qca8k_fdb_access(priv, QCA8K_FDB_LOAD, -1);
> +
> +exit:
> +	mutex_unlock(&priv->reg_mutex);
> +	return ret;
> +}
> +
>  static int
>  qca8k_vlan_access(struct qca8k_priv *priv, enum qca8k_vlan_cmd cmd, u16 vid)
>  {
> @@ -1915,6 +1988,28 @@ qca8k_port_fdb_dump(struct dsa_switch *ds, int port,
>  	return 0;
>  }
>  
> +static int
> +qca8k_port_mdb_add(struct dsa_switch *ds, int port,
> +		   const struct switchdev_obj_port_mdb *mdb)
> +{
> +	struct qca8k_priv *priv = ds->priv;
> +	const u8 *addr = mdb->addr;
> +	u16 vid = mdb->vid;
> +
> +	return qca8k_fdb_search_and_insert(priv, BIT(port), addr, vid);
> +}
> +
> +static int
> +qca8k_port_mdb_del(struct dsa_switch *ds, int port,
> +		   const struct switchdev_obj_port_mdb *mdb)
> +{
> +	struct qca8k_priv *priv = ds->priv;
> +	const u8 *addr = mdb->addr;
> +	u16 vid = mdb->vid;
> +
> +	return qca8k_fdb_search_and_del(priv, BIT(port), addr, vid);
> +}
> +
>  static int
>  qca8k_port_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering,
>  			  struct netlink_ext_ack *extack)
> @@ -2023,6 +2118,8 @@ static const struct dsa_switch_ops qca8k_switch_ops = {
>  	.port_fdb_add		= qca8k_port_fdb_add,
>  	.port_fdb_del		= qca8k_port_fdb_del,
>  	.port_fdb_dump		= qca8k_port_fdb_dump,
> +	.port_mdb_add		= qca8k_port_mdb_add,
> +	.port_mdb_del		= qca8k_port_mdb_del,
>  	.port_vlan_filtering	= qca8k_port_vlan_filtering,
>  	.port_vlan_add		= qca8k_port_vlan_add,
>  	.port_vlan_del		= qca8k_port_vlan_del,
> -- 
> 2.32.0
>