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net: dsa: b53: implement port isolation support

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Implement port isolation support via the Protected Ports register.

Protected ports can only communicate with unprotected ports, but not
with each other, matching the expected behaviour of isolated ports.

Tested on BCM963268BU.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://patch.msgid.link/20251013152834.100169-1-jonas.gorski@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jonas Gorski
2025-10-13 17:28:34 +02:00
committed by Jakub Kicinski
parent e0aa115271
commit bdec4271e8
2 changed files with 28 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/net/dsa/b53/b53_common.c
View File

@@ -632,6 +632,25 @@ static void b53_port_set_learning(struct b53_device *dev, int port,
b53_write16(dev, B53_CTRL_PAGE, B53_DIS_LEARNING, reg);
}
static void b53_port_set_isolated(struct b53_device *dev, int port,
bool isolated)
{
u8 offset;
u16 reg;
if (is5325(dev))
offset = B53_PROTECTED_PORT_SEL_25;
else
offset = B53_PROTECTED_PORT_SEL;
b53_read16(dev, B53_CTRL_PAGE, offset, &reg);
if (isolated)
reg |= BIT(port);
else
reg &= ~BIT(port);
b53_write16(dev, B53_CTRL_PAGE, offset, reg);
}
static void b53_eee_enable_set(struct dsa_switch *ds, int port, bool enable)
{
struct b53_device *dev = ds->priv;
@@ -652,6 +671,7 @@ int b53_setup_port(struct dsa_switch *ds, int port)
b53_port_set_ucast_flood(dev, port, true);
b53_port_set_mcast_flood(dev, port, true);
b53_port_set_learning(dev, port, false);
b53_port_set_isolated(dev, port, false);
/* Force all traffic to go to the CPU port to prevent the ASIC from
* trying to forward to bridged ports on matching FDB entries, then
@@ -2318,7 +2338,7 @@ int b53_br_flags_pre(struct dsa_switch *ds, int port,
struct netlink_ext_ack *extack)
{
struct b53_device *dev = ds->priv;
unsigned long mask = (BR_FLOOD | BR_MCAST_FLOOD);
unsigned long mask = (BR_FLOOD | BR_MCAST_FLOOD | BR_ISOLATED);
if (!is5325(dev))
mask |= BR_LEARNING;
@@ -2343,6 +2363,9 @@ int b53_br_flags(struct dsa_switch *ds, int port,
if (flags.mask & BR_LEARNING)
b53_port_set_learning(ds->priv, port,
!!(flags.val & BR_LEARNING));
if (flags.mask & BR_ISOLATED)
b53_port_set_isolated(ds->priv, port,
!!(flags.val & BR_ISOLATED));
return 0;
}

4
drivers/net/dsa/b53/b53_regs.h
View File

@@ -120,6 +120,10 @@
#define B53_SWITCH_CTRL 0x22
#define B53_MII_DUMB_FWDG_EN BIT(6)
/* Protected Port Selection (16 bit) */
#define B53_PROTECTED_PORT_SEL 0x24
#define B53_PROTECTED_PORT_SEL_25 0x26
/* (16 bit) */
#define B53_UC_FLOOD_MASK 0x32
#define B53_MC_FLOOD_MASK 0x34