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SubjectRe: [PATCH net-next 5/7] net: marvell: prestera: add LAG support
On Wed, Feb 03, 2021 at 06:54:56PM +0200, Vadym Kochan wrote:
> +static struct prestera_lag *prestera_lag_by_dev(struct prestera_switch *sw,
> + struct net_device *dev)
> +{
> + struct prestera_lag *lag;
> + u16 id;
> +
> + for (id = 0; id < sw->lag_max; id++) {
> + lag = &sw->lags[id];
> + if (lag->dev == dev)
> + return lag;
> + }
> +
> + return NULL;
> +}
> +
> +static struct prestera_lag *prestera_lag_create(struct prestera_switch *sw,
> + struct net_device *lag_dev)
> +{
> + struct prestera_lag *lag;

You should initialize with NULL.

> + u16 id;
> +
> + for (id = 0; id < sw->lag_max; id++) {
> + lag = &sw->lags[id];
> + if (!lag->dev)
> + break;
> + }
> + if (lag) {
> + INIT_LIST_HEAD(&lag->members);
> + lag->dev = lag_dev;
> + }
> +
> + return lag;
> +}
> +
> +static void prestera_lag_destroy(struct prestera_switch *sw,
> + struct prestera_lag *lag)
> +{
> + WARN_ON(!list_empty(&lag->members));
> + lag->member_count = 0;
> + lag->dev = NULL;
> +}
> +
> +static int prestera_lag_port_add(struct prestera_port *port,
> + struct net_device *lag_dev)
> +{
> + struct prestera_switch *sw = port->sw;
> + struct prestera_lag *lag;
> + int err;
> +
> + lag = prestera_lag_by_dev(sw, lag_dev);
> + if (!lag) {
> + lag = prestera_lag_create(sw, lag_dev);
> + if (!lag)
> + return -ENOMEM;

I think ENOMEM is reserved for dynamic memory allocation. I think
-ENOSPC may be a better error code (here and everywhere else).
Maybe you would also like to propagate the netlink extack from the
changeupper event and say what went wrong?

> + }
> +
> + if (lag->member_count >= sw->lag_member_max)
> + return -ENOMEM;
> +
> + err = prestera_hw_lag_member_add(port, lag->lag_id);
> + if (err) {
> + if (!lag->member_count)
> + prestera_lag_destroy(sw, lag);
> + return err;
> + }
> +
> + list_add(&port->lag_member, &lag->members);
> + lag->member_count++;
> + port->lag = lag;
> +
> + return 0;
> +}
> +
> +static int prestera_lag_port_del(struct prestera_port *port)
> +{
> + struct prestera_switch *sw = port->sw;
> + struct prestera_lag *lag = port->lag;
> + int err;
> +
> + if (!lag || !lag->member_count)
> + return -EINVAL;
> +
> + err = prestera_hw_lag_member_del(port, lag->lag_id);
> + if (err)
> + return err;
> +
> + list_del(&port->lag_member);
> + lag->member_count--;
> + port->lag = NULL;
> +
> + if (netif_is_bridge_port(lag->dev)) {
> + struct netdev_notifier_changeupper_info br_info;
> +
> + br_info.upper_dev = netdev_master_upper_dev_get(lag->dev);
> + br_info.linking = false;
> +
> + prestera_bridge_port_event(lag->dev, port->dev,
> + NETDEV_CHANGEUPPER, &br_info);
> + }

I think it might be more intuitive if you just call
prestera_port_bridge_leave than simulate a notifier call.

> +
> + if (!lag->member_count)
> + prestera_lag_destroy(sw, lag);
> +
> + return 0;
> +}
> +
> +bool prestera_port_is_lag_member(const struct prestera_port *port)
> +{
> + return !!port->lag;
> +}
> +
> +u16 prestera_port_lag_id(const struct prestera_port *port)
> +{
> + return port->lag->lag_id;
> +}
> +
> +static int prestera_lag_init(struct prestera_switch *sw)
> +{
> + u16 id;
> +
> + sw->lags = kcalloc(sw->lag_max, sizeof(*sw->lags), GFP_KERNEL);
> + if (!sw->lags)
> + return -ENOMEM;
> +
> + for (id = 0; id < sw->lag_max; id++)
> + sw->lags[id].lag_id = id;
> +
> + return 0;
> +}
> +
> +static void prestera_lag_fini(struct prestera_switch *sw)
> +{
> + u8 idx;
> +
> + for (idx = 0; idx < sw->lag_max; idx++)
> + WARN_ON(sw->lags[idx].member_count);
> +
> + kfree(sw->lags);
> +}
> +
> bool prestera_netdev_check(const struct net_device *dev)
> {
> return dev->netdev_ops == &prestera_netdev_ops;
> @@ -507,19 +654,54 @@ struct prestera_port *prestera_port_dev_lower_find(struct net_device *dev)
> return port;
> }
>
> -static int prestera_netdev_port_event(struct net_device *dev,
> +static int prestera_netdev_port_lower_event(struct net_device *dev,
> + unsigned long event, void *ptr)
> +{
> + struct netdev_notifier_changelowerstate_info *info = ptr;
> + struct netdev_lag_lower_state_info *lower_state_info;
> + struct prestera_port *port = netdev_priv(dev);
> + bool enabled;
> +
> + if (!netif_is_lag_port(dev))
> + return 0;
> + if (!prestera_port_is_lag_member(port))
> + return 0;
> +
> + lower_state_info = info->lower_state_info;
> + enabled = lower_state_info->tx_enabled;

You also need to check for info->link_up, otherwise the ports won't get
rebalanced for bonding interfaces with "mode balance-xor miimon 1" and such.
There is also a comment in net/dsa/port.c with more details.

> +
> + return prestera_hw_lag_member_enable(port, port->lag->lag_id, enabled);
> +}
> +
> +static bool prestera_lag_master_check(struct net_device *lag_dev,
> + struct netdev_lag_upper_info *info,
> + struct netlink_ext_ack *ext_ack)
> +{
> + if (info->tx_type != NETDEV_LAG_TX_TYPE_HASH) {
> + NL_SET_ERR_MSG_MOD(ext_ack, "Unsupported LAG Tx type");
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static int prestera_netdev_port_event(struct net_device *lower,
> + struct net_device *dev,
> unsigned long event, void *ptr)
> {
> struct netdev_notifier_changeupper_info *info = ptr;
> + struct prestera_port *port = netdev_priv(dev);
> struct netlink_ext_ack *extack;
> struct net_device *upper;
> + int err;
>
> extack = netdev_notifier_info_to_extack(&info->info);
> upper = info->upper_dev;
>
> switch (event) {
> case NETDEV_PRECHANGEUPPER:
> - if (!netif_is_bridge_master(upper)) {
> + if (!netif_is_bridge_master(upper) &&
> + !netif_is_lag_master(upper)) {

No 8021q uppers allowed on Marvell Prestera switch ports?

> NL_SET_ERR_MSG_MOD(extack, "Unknown upper device type");
> return -EINVAL;
> }
> @@ -531,12 +713,60 @@ static int prestera_netdev_port_event(struct net_device *dev,
> NL_SET_ERR_MSG_MOD(extack, "Upper device is already enslaved");
> return -EINVAL;
> }
> +
> + if (netif_is_lag_master(upper) &&
> + !prestera_lag_master_check(upper, info->upper_info, extack))
> + return -EINVAL;

-EOPNOTSUPP maybe?
In DSA we had a discussion and convened to do software fallback for
bonding modes that can't be offloaded, and just print an extack and
return 0. What is your take on that?

> + if (netif_is_lag_master(upper) && vlan_uses_dev(dev)) {
> + NL_SET_ERR_MSG_MOD(extack,
> + "Master device is a LAG master and port has a VLAN");
> + return -EINVAL;
> + }
> + if (netif_is_lag_port(dev) && is_vlan_dev(upper) &&
> + !netif_is_lag_master(vlan_dev_real_dev(upper))) {
> + NL_SET_ERR_MSG_MOD(extack,
> + "Can not put a VLAN on a LAG port");
> + return -EINVAL;
> + }
> break;
>
> case NETDEV_CHANGEUPPER:
> if (netif_is_bridge_master(upper))
> - return prestera_bridge_port_event(dev, event, ptr);
> + return prestera_bridge_port_event(lower, dev, event,
> + ptr);
> +
> + if (netif_is_lag_master(upper)) {
> + if (info->linking) {
> + err = prestera_lag_port_add(port, upper);
> + if (err)
> + return err;
> + } else {
> + prestera_lag_port_del(port);
> + }
> + }
> break;
> +
> + case NETDEV_CHANGELOWERSTATE:
> + return prestera_netdev_port_lower_event(dev, event, ptr);
> + }
> +
> + return 0;
> +}
> +
> +static int prestera_netdevice_lag_event(struct net_device *lag_dev,
> + unsigned long event, void *ptr)
> +{
> + struct net_device *dev;
> + struct list_head *iter;
> + int err;
> +
> + netdev_for_each_lower_dev(lag_dev, dev, iter) {
> + if (prestera_netdev_check(dev)) {
> + err = prestera_netdev_port_event(lag_dev, dev, event,
> + ptr);
> + if (err)
> + return err;
> + }
> }
>
> return 0;
> @@ -549,7 +779,9 @@ static int prestera_netdev_event_handler(struct notifier_block *nb,
> int err = 0;
>
> if (prestera_netdev_check(dev))
> - err = prestera_netdev_port_event(dev, event, ptr);
> + err = prestera_netdev_port_event(dev, dev, event, ptr);
> + else if (netif_is_lag_master(dev))
> + err = prestera_netdevice_lag_event(dev, event, ptr);
>
> return notifier_from_errno(err);
> }
> @@ -603,6 +835,10 @@ static int prestera_switch_init(struct prestera_switch *sw)
> if (err)
> goto err_dl_register;
>
> + err = prestera_lag_init(sw);
> + if (err)
> + goto err_lag_init;
> +
> err = prestera_create_ports(sw);
> if (err)
> goto err_ports_create;
> @@ -610,6 +846,8 @@ static int prestera_switch_init(struct prestera_switch *sw)
> return 0;
>
> err_ports_create:
> + prestera_lag_fini(sw);
> +err_lag_init:
> prestera_devlink_unregister(sw);
> err_dl_register:
> prestera_event_handlers_unregister(sw);
> @@ -627,6 +865,7 @@ static int prestera_switch_init(struct prestera_switch *sw)
> static void prestera_switch_fini(struct prestera_switch *sw)
> {
> prestera_destroy_ports(sw);
> + prestera_lag_fini(sw);
> prestera_devlink_unregister(sw);
> prestera_event_handlers_unregister(sw);
> prestera_rxtx_switch_fini(sw);
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c b/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
> index 7736d5f498c9..3750c66a550b 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
> @@ -180,6 +180,45 @@ prestera_port_vlan_create(struct prestera_port *port, u16 vid, bool untagged)
> return ERR_PTR(err);
> }
>
> +static int prestera_fdb_add(struct prestera_port *port,
> + const unsigned char *mac, u16 vid, bool dynamic)
> +{
> + if (prestera_port_is_lag_member(port))
> + return prestera_hw_lag_fdb_add(port->sw, prestera_port_lag_id(port),
> + mac, vid, dynamic);
> + else
> + return prestera_hw_fdb_add(port, mac, vid, dynamic);
> +}

I think checkpatch tells you that "else" after "return" is not really
necessary.

> +
> +static int prestera_fdb_del(struct prestera_port *port,
> + const unsigned char *mac, u16 vid)
> +{
> + if (prestera_port_is_lag_member(port))
> + return prestera_hw_lag_fdb_del(port->sw, prestera_port_lag_id(port),
> + mac, vid);
> + else
> + return prestera_hw_fdb_del(port, mac, vid);
> +}
> +
> +static int prestera_fdb_flush_port_vlan(struct prestera_port *port, u16 vid,
> + u32 mode)
> +{
> + if (prestera_port_is_lag_member(port))
> + return prestera_hw_fdb_flush_lag_vlan(port->sw, prestera_port_lag_id(port),
> + vid, mode);
> + else
> + return prestera_hw_fdb_flush_port_vlan(port, vid, mode);
> +}
> +
> +static int prestera_fdb_flush_port(struct prestera_port *port, u32 mode)
> +{
> + if (prestera_port_is_lag_member(port))
> + return prestera_hw_fdb_flush_lag(port->sw, prestera_port_lag_id(port),
> + mode);
> + else
> + return prestera_hw_fdb_flush_port(port, mode);
> +}
> +
> static void
> prestera_port_vlan_bridge_leave(struct prestera_port_vlan *port_vlan)
> {
> @@ -199,11 +238,11 @@ prestera_port_vlan_bridge_leave(struct prestera_port_vlan *port_vlan)
> last_port = port_count == 1;
>
> if (last_vlan)
> - prestera_hw_fdb_flush_port(port, fdb_flush_mode);
> + prestera_fdb_flush_port(port, fdb_flush_mode);
> else if (last_port)
> prestera_hw_fdb_flush_vlan(port->sw, vid, fdb_flush_mode);
> else
> - prestera_hw_fdb_flush_port_vlan(port, vid, fdb_flush_mode);
> + prestera_fdb_flush_port_vlan(port, vid, fdb_flush_mode);
>
> list_del(&port_vlan->br_vlan_head);
> prestera_bridge_vlan_put(br_vlan);
> @@ -394,9 +433,9 @@ prestera_bridge_port_add(struct prestera_bridge *bridge, struct net_device *dev)
> }
>
> static int
> -prestera_bridge_1d_port_join(struct prestera_bridge_port *br_port)
> +prestera_bridge_1d_port_join(struct prestera_bridge_port *br_port,
> + struct prestera_port *port)
> {
> - struct prestera_port *port = netdev_priv(br_port->dev);
> struct prestera_bridge *bridge = br_port->bridge;
> int err;
>
> @@ -423,6 +462,7 @@ prestera_bridge_1d_port_join(struct prestera_bridge_port *br_port)
> }
>
> static int prestera_port_bridge_join(struct prestera_port *port,
> + struct net_device *lower,
> struct net_device *upper)
> {
> struct prestera_switchdev *swdev = port->sw->swdev;
> @@ -437,7 +477,7 @@ static int prestera_port_bridge_join(struct prestera_port *port,
> return PTR_ERR(bridge);
> }
>
> - br_port = prestera_bridge_port_add(bridge, port->dev);
> + br_port = prestera_bridge_port_add(bridge, lower);
> if (IS_ERR(br_port)) {
> err = PTR_ERR(br_port);
> goto err_brport_create;
> @@ -446,7 +486,7 @@ static int prestera_port_bridge_join(struct prestera_port *port,
> if (bridge->vlan_enabled)
> return 0;
>
> - err = prestera_bridge_1d_port_join(br_port);
> + err = prestera_bridge_1d_port_join(br_port, port);
> if (err)
> goto err_port_join;
>
> @@ -459,19 +499,17 @@ static int prestera_port_bridge_join(struct prestera_port *port,
> return err;
> }
>
> -static void prestera_bridge_1q_port_leave(struct prestera_bridge_port *br_port)
> +static void prestera_bridge_1q_port_leave(struct prestera_bridge_port *br_port,
> + struct prestera_port *port)
> {
> - struct prestera_port *port = netdev_priv(br_port->dev);
> -
> - prestera_hw_fdb_flush_port(port, PRESTERA_FDB_FLUSH_MODE_ALL);
> + prestera_fdb_flush_port(port, PRESTERA_FDB_FLUSH_MODE_ALL);
> prestera_port_pvid_set(port, PRESTERA_DEFAULT_VID);
> }
>
> -static void prestera_bridge_1d_port_leave(struct prestera_bridge_port *br_port)
> +static void prestera_bridge_1d_port_leave(struct prestera_bridge_port *br_port,
> + struct prestera_port *port)
> {
> - struct prestera_port *port = netdev_priv(br_port->dev);
> -
> - prestera_hw_fdb_flush_port(port, PRESTERA_FDB_FLUSH_MODE_ALL);
> + prestera_fdb_flush_port(port, PRESTERA_FDB_FLUSH_MODE_ALL);
> prestera_hw_bridge_port_delete(port, br_port->bridge->bridge_id);
> }
>
> @@ -506,6 +544,7 @@ static int prestera_port_vid_stp_set(struct prestera_port *port, u16 vid,
> }
>
> static void prestera_port_bridge_leave(struct prestera_port *port,
> + struct net_device *lower,
> struct net_device *upper)
> {
> struct prestera_switchdev *swdev = port->sw->swdev;
> @@ -516,16 +555,16 @@ static void prestera_port_bridge_leave(struct prestera_port *port,
> if (!bridge)
> return;
>
> - br_port = __prestera_bridge_port_by_dev(bridge, port->dev);
> + br_port = __prestera_bridge_port_by_dev(bridge, lower);
> if (!br_port)
> return;
>
> bridge = br_port->bridge;
>
> if (bridge->vlan_enabled)
> - prestera_bridge_1q_port_leave(br_port);
> + prestera_bridge_1q_port_leave(br_port, port);
> else
> - prestera_bridge_1d_port_leave(br_port);
> + prestera_bridge_1d_port_leave(br_port, port);
>
> prestera_hw_port_learning_set(port, false);
> prestera_hw_port_flood_set(port, false);
> @@ -533,8 +572,8 @@ static void prestera_port_bridge_leave(struct prestera_port *port,
> prestera_bridge_port_put(br_port);
> }
>
> -int prestera_bridge_port_event(struct net_device *dev, unsigned long event,
> - void *ptr)
> +int prestera_bridge_port_event(struct net_device *lower, struct net_device *dev,
> + unsigned long event, void *ptr)

It's odd that you have a net_device lower and a net_device dev.
You're only using "dev" to retrieve the struct prestera_port, can't you
just pass that as parameter? It will also help avoid possible mistakes
in the future between lower (which can be a LAG or a port) and which is
associated with a struct prestera_bridge_port, and dev which is only a
port, and is associated with struct prestera_port.

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