[PATCH net-next 2/3] net: lan966x: Implement the callback SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED
From: Horatiu Vultur
Date: Fri Feb 04 2022 - 04:14:21 EST
The callback allows to enable/disable multicast snooping.
When the snooping is enabled, all IGMP and MLD frames are redirected to
the CPU, therefore make sure not to set the skb flag 'offload_fwd_mark'.
The HW will not flood multicast ipv4/ipv6 data frames.
When the snooping is disabled, the HW will flood IGMP, MLD and multicast
ipv4/ipv6 frames according to the mcast_flood flag.
Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
---
.../ethernet/microchip/lan966x/lan966x_main.c | 35 +++++++++++-
.../ethernet/microchip/lan966x/lan966x_main.h | 1 +
.../ethernet/microchip/lan966x/lan966x_regs.h | 18 ++++++
.../microchip/lan966x/lan966x_switchdev.c | 57 +++++++++++++++++++
4 files changed, 110 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index 3d1072955183..d62484f14564 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -4,11 +4,13 @@
#include <linux/if_bridge.h>
#include <linux/if_vlan.h>
#include <linux/iopoll.h>
+#include <linux/ip.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/packing.h>
#include <linux/phy/phy.h>
#include <linux/reset.h>
+#include <net/addrconf.h>
#include "lan966x_main.h"
@@ -419,6 +421,32 @@ bool lan966x_netdevice_check(const struct net_device *dev)
return dev->netdev_ops == &lan966x_port_netdev_ops;
}
+static bool lan966x_hw_offload(struct lan966x *lan966x, u32 port,
+ struct sk_buff *skb)
+{
+ u32 val;
+
+ /* The IGMP and MLD frames are not forward by the HW if
+ * multicast snooping is enabled, therefor don't mark as
+ * offload to allow the SW to forward the frames accordingly.
+ */
+ val = lan_rd(lan966x, ANA_CPU_FWD_CFG(port));
+ if (!(val & (ANA_CPU_FWD_CFG_IGMP_REDIR_ENA |
+ ANA_CPU_FWD_CFG_MLD_REDIR_ENA)))
+ return true;
+
+ if (skb->protocol == htons(ETH_P_IP) &&
+ ip_hdr(skb)->protocol == IPPROTO_IGMP)
+ return false;
+
+ if (skb->protocol == htons(ETH_P_IPV6) &&
+ ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
+ !ipv6_mc_check_mld(skb))
+ return false;
+
+ return true;
+}
+
static int lan966x_port_xtr_status(struct lan966x *lan966x, u8 grp)
{
return lan_rd(lan966x, QS_XTR_RD(grp));
@@ -563,9 +591,14 @@ static irqreturn_t lan966x_xtr_irq_handler(int irq, void *args)
lan966x_ptp_rxtstamp(lan966x, skb, timestamp);
skb->protocol = eth_type_trans(skb, dev);
- if (lan966x->bridge_mask & BIT(src_port))
+ if (lan966x->bridge_mask & BIT(src_port)) {
skb->offload_fwd_mark = 1;
+ skb_reset_network_header(skb);
+ if (!lan966x_hw_offload(lan966x, src_port, skb))
+ skb->offload_fwd_mark = 0;
+ }
+
netif_rx_ni(skb);
dev->stats.rx_bytes += len;
dev->stats.rx_packets++;
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 026474c609ea..31fc54214041 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -170,6 +170,7 @@ struct lan966x_port {
bool vlan_aware;
bool learn_ena;
+ bool mcast_ena;
struct phylink_config phylink_config;
struct phylink_pcs phylink_pcs;
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
index 37a5d7e63cb6..0c0b3e173d53 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
@@ -299,6 +299,24 @@ enum lan966x_target {
/* ANA:PORT:CPU_FWD_CFG */
#define ANA_CPU_FWD_CFG(g) __REG(TARGET_ANA, 0, 1, 28672, g, 9, 128, 96, 0, 1, 4)
+#define ANA_CPU_FWD_CFG_MLD_REDIR_ENA BIT(6)
+#define ANA_CPU_FWD_CFG_MLD_REDIR_ENA_SET(x)\
+ FIELD_PREP(ANA_CPU_FWD_CFG_MLD_REDIR_ENA, x)
+#define ANA_CPU_FWD_CFG_MLD_REDIR_ENA_GET(x)\
+ FIELD_GET(ANA_CPU_FWD_CFG_MLD_REDIR_ENA, x)
+
+#define ANA_CPU_FWD_CFG_IGMP_REDIR_ENA BIT(5)
+#define ANA_CPU_FWD_CFG_IGMP_REDIR_ENA_SET(x)\
+ FIELD_PREP(ANA_CPU_FWD_CFG_IGMP_REDIR_ENA, x)
+#define ANA_CPU_FWD_CFG_IGMP_REDIR_ENA_GET(x)\
+ FIELD_GET(ANA_CPU_FWD_CFG_IGMP_REDIR_ENA, x)
+
+#define ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA BIT(4)
+#define ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA_SET(x)\
+ FIELD_PREP(ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA, x)
+#define ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA_GET(x)\
+ FIELD_GET(ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA, x)
+
#define ANA_CPU_FWD_CFG_SRC_COPY_ENA BIT(3)
#define ANA_CPU_FWD_CFG_SRC_COPY_ENA_SET(x)\
FIELD_PREP(ANA_CPU_FWD_CFG_SRC_COPY_ENA, x)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index 7de55f6a4da8..cf2535c18df8 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -9,6 +9,37 @@ static struct notifier_block lan966x_netdevice_nb __read_mostly;
static struct notifier_block lan966x_switchdev_nb __read_mostly;
static struct notifier_block lan966x_switchdev_blocking_nb __read_mostly;
+static void lan966x_port_set_mcast_ip_flood(struct lan966x_port *port,
+ u32 pgid_ip)
+{
+ struct lan966x *lan966x = port->lan966x;
+ u32 flood_mask_ip;
+
+ flood_mask_ip = lan_rd(lan966x, ANA_PGID(pgid_ip));
+ flood_mask_ip = ANA_PGID_PGID_GET(flood_mask_ip);
+
+ /* If mcast snooping is not enabled then use mcast flood mask
+ * to decide to enable multicast flooding or not.
+ */
+ if (!port->mcast_ena) {
+ u32 flood_mask;
+
+ flood_mask = lan_rd(lan966x, ANA_PGID(PGID_MC));
+ flood_mask = ANA_PGID_PGID_GET(flood_mask);
+
+ if (flood_mask & BIT(port->chip_port))
+ flood_mask_ip |= BIT(port->chip_port);
+ else
+ flood_mask_ip &= ~BIT(port->chip_port);
+ } else {
+ flood_mask_ip &= ~BIT(port->chip_port);
+ }
+
+ lan_rmw(ANA_PGID_PGID_SET(flood_mask_ip),
+ ANA_PGID_PGID,
+ lan966x, ANA_PGID(pgid_ip));
+}
+
static void lan966x_port_set_mcast_flood(struct lan966x_port *port,
bool enabled)
{
@@ -23,6 +54,11 @@ static void lan966x_port_set_mcast_flood(struct lan966x_port *port,
lan_rmw(ANA_PGID_PGID_SET(val),
ANA_PGID_PGID,
port->lan966x, ANA_PGID(PGID_MC));
+
+ if (!port->mcast_ena) {
+ lan966x_port_set_mcast_ip_flood(port, PGID_MCIPV4);
+ lan966x_port_set_mcast_ip_flood(port, PGID_MCIPV6);
+ }
}
static void lan966x_port_set_ucast_flood(struct lan966x_port *port,
@@ -144,6 +180,24 @@ static void lan966x_port_ageing_set(struct lan966x_port *port,
lan966x_mac_set_ageing(port->lan966x, ageing_time);
}
+static void lan966x_port_mc_set(struct lan966x_port *port, bool mcast_ena)
+{
+ struct lan966x *lan966x = port->lan966x;
+
+ port->mcast_ena = mcast_ena;
+
+ lan_rmw(ANA_CPU_FWD_CFG_IGMP_REDIR_ENA_SET(mcast_ena) |
+ ANA_CPU_FWD_CFG_MLD_REDIR_ENA_SET(mcast_ena) |
+ ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA_SET(mcast_ena),
+ ANA_CPU_FWD_CFG_IGMP_REDIR_ENA |
+ ANA_CPU_FWD_CFG_MLD_REDIR_ENA |
+ ANA_CPU_FWD_CFG_IPMC_CTRL_COPY_ENA,
+ lan966x, ANA_CPU_FWD_CFG(port->chip_port));
+
+ lan966x_port_set_mcast_ip_flood(port, PGID_MCIPV4);
+ lan966x_port_set_mcast_ip_flood(port, PGID_MCIPV6);
+}
+
static int lan966x_port_attr_set(struct net_device *dev, const void *ctx,
const struct switchdev_attr *attr,
struct netlink_ext_ack *extack)
@@ -171,6 +225,9 @@ static int lan966x_port_attr_set(struct net_device *dev, const void *ctx,
lan966x_vlan_port_set_vlan_aware(port, attr->u.vlan_filtering);
lan966x_vlan_port_apply(port);
break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED:
+ lan966x_port_mc_set(port, !attr->u.mc_disabled);
+ break;
default:
err = -EOPNOTSUPP;
break;
--
2.33.0