netdev - Re: [PATCH net-next v2 6/6] net: marvell: prestera: Implement initial inetaddr notifiers

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Date:   Thu, 30 Dec 2021 16:39:23 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Yevhen Orlov <yevhen.orlov@...ision.eu>
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org, andrew@...n.ch,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Mickey Rachamim <mickeyr@...vell.com>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 6/6] net: marvell: prestera: Implement
 initial inetaddr notifiers

On Mon, Dec 27, 2021 at 11:52:31PM +0200, Yevhen Orlov wrote:
> Add inetaddr notifiers to support add/del IPv4 address on switchdev
> port. We create TRAP on first address, added on port and delete TRAP,
> when last address removed.
> Currently, driver supports only regular port to became routed.
> Other port type support will be added later
> 
> Co-developed-by: Taras Chornyi <tchornyi@...vell.com>
> Signed-off-by: Taras Chornyi <tchornyi@...vell.com>
> Co-developed-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> Signed-off-by: Yevhen Orlov <yevhen.orlov@...ision.eu>
> ---
> v1-->v2
> * Remove useless assigment in prestera_fix_tb_id
> ---
>  .../marvell/prestera/prestera_router.c        | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
> index 0eb5f5e00e4e..483f0ba45ce0 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
> @@ -4,16 +4,31 @@
>  #include <linux/kernel.h>
>  #include <linux/types.h>
>  #include <linux/inetdevice.h>
> +#include <net/switchdev.h>
>  
>  #include "prestera.h"
>  #include "prestera_router_hw.h"
>  
> +/* This util to be used, to convert kernel rules for default vr in hw_vr */
> +static u32 prestera_fix_tb_id(u32 tb_id)
> +{
> +	if (tb_id == RT_TABLE_UNSPEC ||
> +	    tb_id == RT_TABLE_LOCAL ||
> +	    tb_id == RT_TABLE_DEFAULT)
> +		tb_id = RT_TABLE_MAIN;
> +
> +	return tb_id;
> +}
> +
>  static int __prestera_inetaddr_port_event(struct net_device *port_dev,
>  					  unsigned long event,
>  					  struct netlink_ext_ack *extack)
>  {
>  	struct prestera_port *port = netdev_priv(port_dev);
>  	int err;
> +	struct prestera_rif_entry *re;
> +	struct prestera_rif_entry_key re_key = {};
> +	u32 kern_tb_id;

Reverse xmas tree

>  
>  	err = prestera_is_valid_mac_addr(port, port_dev->dev_addr);
>  	if (err) {
> @@ -21,9 +36,34 @@ static int __prestera_inetaddr_port_event(struct net_device *port_dev,
>  		return err;
>  	}
>  
> +	kern_tb_id = l3mdev_fib_table(port_dev);
> +	re_key.iface.type = PRESTERA_IF_PORT_E;
> +	re_key.iface.dev_port.hw_dev_num  = port->dev_id;
> +	re_key.iface.dev_port.port_num  = port->hw_id;
> +	re = prestera_rif_entry_find(port->sw, &re_key);
> +
>  	switch (event) {
>  	case NETDEV_UP:
> +		if (re) {
> +			NL_SET_ERR_MSG_MOD(extack, "rif_entry already exist");

These messages are communicated to user space so use a message that is
more user friendly / informative

> +			return -EEXIST;
> +		}
> +		re = prestera_rif_entry_create(port->sw, &re_key,
> +					       prestera_fix_tb_id(kern_tb_id),
> +					       port_dev->dev_addr);
> +		if (!re) {
> +			NL_SET_ERR_MSG_MOD(extack, "Can't create rif_entry");
> +			return -EINVAL;
> +		}
> +		dev_hold(port_dev);

What is the purpose of this dev_hold()?

> +		break;
>  	case NETDEV_DOWN:
> +		if (!re) {
> +			NL_SET_ERR_MSG_MOD(extack, "rif_entry not exist");
> +			return -EEXIST;
> +		}
> +		prestera_rif_entry_destroy(port->sw, re);
> +		dev_put(port_dev);
>  		break;
>  	}
>  
> -- 
> 2.17.1
>