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Date: Tue, 4 Jun 2024 16:49:12 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: MD Danish Anwar <danishanwar@...com>, Dan Carpenter
<dan.carpenter@...aro.org>, Jan Kiszka <jan.kiszka@...mens.com>, Diogo Ivo
<diogo.ivo@...mens.com>, Andrew Lunn <andrew@...n.ch>, Paolo Abeni
<pabeni@...hat.com>, Simon Horman <horms@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <srk@...com>, Vignesh Raghavendra
<vigneshr@...com>, Roger Quadros <rogerq@...nel.org>
Subject: Re: [PATCH net-next v2] net: ti: icssg-prueth: Add multicast
filtering support
On 04.06.2024 13:44, MD Danish Anwar wrote:
> Add multicast filtering support for ICSSG Driver.
>
> The driver will keep a copy of multicast addresses in emac->mcast_list.
> This list will be kept in sync with the netdev list and to add / del
> multicast address icssg_prueth_mac_add_mcast / icssg_prueth_mac_del_mcast
> APIs will be called.
>
> To add a mac_address for a port, driver need to call icssg_fdb_add_del()
> and pass the mac_address and BIT(port_id) to the API. The ICSSG firmware
> will then configure the rules and allow filtering.
>
> If a mac_address is added to port0 and the same mac_address needs to be
> added for port1, driver needs to pass BIT(port0) | BIT(port1) to the
> icssg_fdb_add_del() API. If driver just pass BIT(port1) then the entry for
> port0 will be overwritten / lost. This is a design constraint on the
> firmware side.
>
> To overcome this in the driver, to add any mac_address for let's say portX
> driver first checks if the same mac_address is already added for any other
> port. If yes driver calls icssg_fdb_add_del() with BIT(portX) |
> BIT(other_existing_port). If not, driver calls icssg_fdb_add_del() with
> BIT(portX).
>
> The same thing is applicable for deleting mac_addresses as well. This
> logic is in icssg_prueth_mac_add_mcast / icssg_prueth_mac_del_mcast APIs.
>
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> ---
> v1 -> v2:
> *) Rebased on latest net-next/main.
>
> NOTE: This series can be applied cleanly on the tip of net-next/main. This
> series doesn't depend on any other ICSSG driver related series that is
> floating around in netdev.
>
> v1 https://lore.kernel.org/all/20240516091752.2969092-1-danishanwar@ti.com/
>
> drivers/net/ethernet/ti/icssg/icssg_prueth.c | 50 ++++++++++++++++++--
> drivers/net/ethernet/ti/icssg/icssg_prueth.h | 3 ++
> 2 files changed, 49 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> index 6e65aa0977d4..03dd49f0afb7 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
> @@ -439,6 +439,37 @@ const struct icss_iep_clockops prueth_iep_clockops = {
> .perout_enable = prueth_perout_enable,
> };
>
> +static int icssg_prueth_mac_add_mcast(struct net_device *ndev, const u8 *addr)
> +{
> + struct prueth_emac *emac = netdev_priv(ndev);
> + int port_mask = BIT(emac->port_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);
> +
> + return 0;
> +}
> +
> +static int icssg_prueth_mac_del_mcast(struct net_device *ndev, const u8 *addr)
> +{
> + struct prueth_emac *emac = netdev_priv(ndev);
> + int port_mask = BIT(emac->port_id);
> + int other_port_mask;
> +
> + other_port_mask = port_mask ^ icssg_fdb_lookup(emac, addr, 0);
> +
> + icssg_fdb_add_del(emac, addr, 0, port_mask, false);
> + icssg_vtbl_modify(emac, 0, 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);
> + }
> +
> + return 0;
> +}
> +
> /**
> * emac_ndo_open - EMAC device open
> * @ndev: network adapter device
> @@ -547,6 +578,8 @@ static int emac_ndo_open(struct net_device *ndev)
>
> prueth->emacs_initialized++;
>
> + __hw_addr_init(&emac->mcast_list);
> +
> queue_work(system_long_wq, &emac->stats_work.work);
>
> return 0;
> @@ -599,6 +632,9 @@ static int emac_ndo_stop(struct net_device *ndev)
>
> icssg_class_disable(prueth->miig_rt, prueth_emac_slice(emac));
>
> + __dev_mc_unsync(ndev, icssg_prueth_mac_del_mcast);
> + __hw_addr_init(&emac->mcast_list);
> +
> atomic_set(&emac->tdown_cnt, emac->tx_ch_num);
> /* ensure new tdown_cnt value is visible */
> smp_mb__after_atomic();
> @@ -675,10 +711,15 @@ static void emac_ndo_set_rx_mode_work(struct work_struct *work)
> return;
> }
>
> - if (!netdev_mc_empty(ndev)) {
> - emac_set_port_state(emac, ICSSG_EMAC_PORT_MC_FLOODING_ENABLE);
> - return;
> - }
> + /* make a mc list copy */
> +
> + netif_addr_lock_bh(ndev);
> + __hw_addr_sync(&emac->mcast_list, &ndev->mc, ndev->addr_len);
> + netif_addr_unlock_bh(ndev);
> +
> + __hw_addr_sync_dev(&emac->mcast_list, ndev,
> + icssg_prueth_mac_add_mcast,
> + icssg_prueth_mac_del_mcast);
Is there a reason __dev_mc_sync can't be used here?
net_device has mc list already, no need to keep your own list
in prueth_emac.
> }
>
> /**
> @@ -767,6 +808,7 @@ static int prueth_netdev_init(struct prueth *prueth,
> SET_NETDEV_DEV(ndev, prueth->dev);
> spin_lock_init(&emac->lock);
> mutex_init(&emac->cmd_lock);
> + __hw_addr_init(&emac->mcast_list);
>
> emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
> if (!emac->phy_node && !of_phy_is_fixed_link(eth_node)) {
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> index 5eeeccb73665..2bfda26b5901 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
> @@ -155,6 +155,9 @@ struct prueth_emac {
> unsigned int tx_ts_enabled : 1;
> unsigned int half_duplex : 1;
>
> + /* List for storing multicast addresses */
> + struct netdev_hw_addr_list mcast_list;
> +
> /* DMA related */
> struct prueth_tx_chn tx_chns[PRUETH_MAX_TX_QUEUES];
> struct completion tdown_complete;
>
> base-commit: 2589d668e1a6ebe85329f1054cdad13647deac06
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