Re: [PATCH net-next 3/4] net: ti: icssg-prueth: Add Multicast Filtering support for VLAN in MAC mode

[Michal Swiatkowski <michal.swiatkowski@linux.intel.com>]

On Mon, Dec 16, 2024 at 03:30:43PM +0530, MD Danish Anwar wrote:
> Add multicast filtering support for VLAN interfaces in dual EMAC mode
> for ICSSG driver.
> 
> The driver uses vlan_for_each() API to get the list of available
> vlans. The driver then sync mc addr of vlan interface with a locally
> mainatined list emac->vlan_mcast_list[vid] using __hw_addr_sync_multiple()
> API.
> 
> The driver then calls the sync / unsync callbacks and based on whether
> the ndev is vlan or not, driver passes appropriate vid to FDB helper
> functions.
> 
> This commit also exports __hw_addr_sync_multiple() in order to use it
> from the ICSSG driver.
> 
> Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
> ---
>  drivers/net/ethernet/ti/icssg/icssg_prueth.c | 69 ++++++++++++++++----
>  drivers/net/ethernet/ti/icssg/icssg_prueth.h |  6 ++
>  include/linux/netdevice.h                    |  3 +
>  net/core/dev_addr_lists.c                    |  7 +-
>  4 files changed, 68 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> index e031bccf31dc..a18773ef6eab 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> @@ -472,30 +472,43 @@ const struct icss_iep_clockops prueth_iep_clockops = {
>  
>  static int icssg_prueth_add_mcast(struct net_device *ndev, const u8 *addr)
>  {
> -	struct prueth_emac *emac = netdev_priv(ndev);
> -	int port_mask = BIT(emac->port_id);
> +	struct net_device *real_dev;
> +	struct prueth_emac *emac;
> +	int port_mask;
> +	u8 vlan_id;
>  
> -	port_mask |= icssg_fdb_lookup(emac, addr, 0);
> -	icssg_fdb_add_del(emac, addr, 0, port_mask, true);
> -	icssg_vtbl_modify(emac, 0, port_mask, port_mask, true);
> +	vlan_id = is_vlan_dev(ndev) ? vlan_dev_vlan_id(ndev) : PRUETH_DFLT_VLAN_MAC;
> +	real_dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
Looks like a helper for that can be nice to have.

> +	emac = netdev_priv(real_dev);
> +
> +	port_mask = BIT(emac->port_id) | icssg_fdb_lookup(emac, addr, vlan_id);
> +	icssg_fdb_add_del(emac, addr, vlan_id, port_mask, true);
> +	icssg_vtbl_modify(emac, vlan_id, port_mask, port_mask, true);
>  
>  	return 0;
>  }
>  
>  static int icssg_prueth_del_mcast(struct net_device *ndev, const u8 *addr)
>  {
> -	struct prueth_emac *emac = netdev_priv(ndev);
> -	int port_mask = BIT(emac->port_id);
> +	struct net_device *real_dev;
> +	struct prueth_emac *emac;
>  	int other_port_mask;
> +	int port_mask;
> +	u8 vlan_id;
> +
> +	vlan_id = is_vlan_dev(ndev) ? vlan_dev_vlan_id(ndev) : PRUETH_DFLT_VLAN_MAC;
> +	real_dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
> +	emac = netdev_priv(real_dev);
>  
> -	other_port_mask = port_mask ^ icssg_fdb_lookup(emac, addr, 0);
> +	port_mask = BIT(emac->port_id);
> +	other_port_mask = port_mask ^ icssg_fdb_lookup(emac, addr, vlan_id);
>  
> -	icssg_fdb_add_del(emac, addr, 0, port_mask, false);
> -	icssg_vtbl_modify(emac, 0, port_mask, port_mask, false);
> +	icssg_fdb_add_del(emac, addr, vlan_id, port_mask, false);
> +	icssg_vtbl_modify(emac, vlan_id, port_mask, port_mask, false);
>  
>  	if (other_port_mask) {
> -		icssg_fdb_add_del(emac, addr, 0, other_port_mask, true);
> -		icssg_vtbl_modify(emac, 0, other_port_mask, other_port_mask, true);
> +		icssg_fdb_add_del(emac, addr, vlan_id, other_port_mask, true);
> +		icssg_vtbl_modify(emac, vlan_id, other_port_mask, other_port_mask, true);
>  	}
>  
>  	return 0;
> @@ -531,6 +544,28 @@ static int icssg_prueth_hsr_del_mcast(struct net_device *ndev, const u8 *addr)
>  	return 0;
>  }
>  
> +static int icssg_update_vlan_mcast(struct net_device *vdev, int vid,
> +				   void *args)
> +{
> +	struct net_device *vport_ndev;
> +	struct prueth_emac *emac;
> +
> +	if (!vdev || !vid)
> +		return 0;
> +
> +	vport_ndev = vlan_dev_real_dev(vdev);
> +	emac = netdev_priv(vport_ndev);
> +
> +	netif_addr_lock_bh(vdev);
> +	__hw_addr_sync_multiple(&emac->vlan_mcast_list[vid], &vdev->mc, vdev->addr_len);
Only question, why dev_mc_sync_multiple can't be used here?

> +	netif_addr_unlock_bh(vdev);
> +
> +	__hw_addr_sync_dev(&emac->vlan_mcast_list[vid], vdev,
> +			   icssg_prueth_add_mcast, icssg_prueth_del_mcast);
> +
> +	return 0;
> +}
> +
>  /**
>   * emac_ndo_open - EMAC device open
>   * @ndev: network adapter device
> @@ -772,12 +807,17 @@ static void emac_ndo_set_rx_mode_work(struct work_struct *work)
>  		return;
>  	}
>  
> -	if (emac->prueth->is_hsr_offload_mode)
> +	if (emac->prueth->is_hsr_offload_mode) {
>  		__dev_mc_sync(ndev, icssg_prueth_hsr_add_mcast,
>  			      icssg_prueth_hsr_del_mcast);
> -	else
> +	} else {
>  		__dev_mc_sync(ndev, icssg_prueth_add_mcast,
>  			      icssg_prueth_del_mcast);
> +		if (rtnl_trylock()) {
> +			vlan_for_each(ndev, icssg_update_vlan_mcast, NULL);
> +			rtnl_unlock();
> +		}
> +	}
>  }
>  
>  /**
> @@ -828,6 +868,7 @@ static int emac_ndo_vlan_rx_add_vid(struct net_device *ndev,
>  	if (prueth->is_hsr_offload_mode)
>  		port_mask |= BIT(PRUETH_PORT_HOST);
>  
> +	__hw_addr_init(&emac->vlan_mcast_list[vid]);
>  	netdev_err(emac->ndev, "VID add vid:%u port_mask:%X untag_mask %X\n",
>  		   vid, port_mask, untag_mask);
>  
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> index f5c1d473e9f9..4da8b87408b5 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> @@ -83,6 +83,10 @@
>  #define ICSS_CMD_ADD_FILTER 0x7
>  #define ICSS_CMD_ADD_MAC 0x8
>  
> +/* VLAN Filtering Related MACROs */
> +#define PRUETH_DFLT_VLAN_MAC	0
> +#define MAX_VLAN_ID		256
> +
>  /* In switch mode there are 3 real ports i.e. 3 mac addrs.
>   * however Linux sees only the host side port. The other 2 ports
>   * are the switch ports.
> @@ -201,6 +205,8 @@ struct prueth_emac {
>  	/* RX IRQ Coalescing Related */
>  	struct hrtimer rx_hrtimer;
>  	unsigned long rx_pace_timeout_ns;
> +
> +	struct netdev_hw_addr_list vlan_mcast_list[MAX_VLAN_ID];
>  };
>  
>  /**
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index d917949bba03..a5c169b19543 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -4685,6 +4685,9 @@ int devm_register_netdev(struct device *dev, struct net_device *ndev);
>  /* General hardware address lists handling functions */
>  int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
>  		   struct netdev_hw_addr_list *from_list, int addr_len);
> +int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
> +			    struct netdev_hw_addr_list *from_list,
> +			    int addr_len);
>  void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
>  		      struct netdev_hw_addr_list *from_list, int addr_len);
>  int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
> diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
> index 166e404f7c03..90716bd736f3 100644
> --- a/net/core/dev_addr_lists.c
> +++ b/net/core/dev_addr_lists.c
> @@ -242,9 +242,9 @@ static void __hw_addr_unsync_one(struct netdev_hw_addr_list *to_list,
>  	__hw_addr_del_entry(from_list, ha, false, false);
>  }
>  
> -static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
> -				   struct netdev_hw_addr_list *from_list,
> -				   int addr_len)
> +int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
> +			    struct netdev_hw_addr_list *from_list,
> +			    int addr_len)
>  {
>  	int err = 0;
>  	struct netdev_hw_addr *ha, *tmp;
> @@ -260,6 +260,7 @@ static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
>  	}
>  	return err;
>  }
> +EXPORT_SYMBOL(__hw_addr_sync_multiple);
>  
>  /* This function only works where there is a strict 1-1 relationship
>   * between source and destination of they synch. If you ever need to
> -- 
> 2.34.1