[PATCH net-next v4 01/12] net: dsa: vsc73xx: add port_stp_state_set function
From: Pawel Dembicki
Date: Sat Jul 13 2024 - 17:17:01 EST
This isn't a fully functional implementation of 802.1D, but
port_stp_state_set is required for a future tag8021q operations.
This implementation handles properly all states, but vsc73xx doesn't
forward STP packets.
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Signed-off-by: Pawel Dembicki <paweldembicki@xxxxxxxxx>
---
v4-v1:
- resend only
---
Before patch series split:
https://patchwork.kernel.org/project/netdevbpf/list/?series=841034&state=%2A&archive=both
v7:
- implement 'vsc73xx_refresh_fwd_map' simplification
v6:
- fix inconsistent indenting
v5:
- remove unneeded 'RECVMASK' operations
- reorganise vsc73xx_refresh_fwd_map function
v4:
- fully reworked port_stp_state_set
v3:
- use 'VSC73XX_MAX_NUM_PORTS' define
- add 'state == BR_STATE_DISABLED' condition
- fix style issues
v2:
- fix kdoc
---
drivers/net/dsa/vitesse-vsc73xx-core.c | 96 +++++++++++++++++++++++---
1 file changed, 85 insertions(+), 11 deletions(-)
diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index 4b031fefcec6..ebeea259f019 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -164,6 +164,10 @@
#define VSC73XX_AGENCTRL 0xf0
#define VSC73XX_CAPRST 0xff
+#define VSC73XX_SRCMASKS_CPU_COPY BIT(27)
+#define VSC73XX_SRCMASKS_MIRROR BIT(26)
+#define VSC73XX_SRCMASKS_PORTS_MASK GENMASK(7, 0)
+
#define VSC73XX_MACACCESS_CPU_COPY BIT(14)
#define VSC73XX_MACACCESS_FWD_KILL BIT(13)
#define VSC73XX_MACACCESS_IGNORE_VLAN BIT(12)
@@ -623,9 +627,6 @@ static int vsc73xx_setup(struct dsa_switch *ds)
vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS |
VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS);
- /* Enable reception of frames on all ports */
- vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_RECVMASK,
- 0x5f);
/* IP multicast flood mask (table 144) */
vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_IFLODMSK,
0xff);
@@ -788,10 +789,6 @@ static void vsc73xx_mac_link_down(struct phylink_config *config,
/* Allow backward dropping of frames from this port */
vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ARBITER, 0,
VSC73XX_SBACKWDROP, BIT(port), BIT(port));
-
- /* Receive mask (disable forwarding) */
- vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
- VSC73XX_RECVMASK, BIT(port), 0);
}
static void vsc73xx_mac_link_up(struct phylink_config *config,
@@ -844,10 +841,6 @@ static void vsc73xx_mac_link_up(struct phylink_config *config,
vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ARBITER, 0,
VSC73XX_ARBDISC, BIT(port), 0);
- /* Enable port (forwarding) in the receive mask */
- vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
- VSC73XX_RECVMASK, BIT(port), BIT(port));
-
/* Disallow backward dropping of frames from this port */
vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ARBITER, 0,
VSC73XX_SBACKWDROP, BIT(port), 0);
@@ -1039,6 +1032,86 @@ static void vsc73xx_phylink_get_caps(struct dsa_switch *dsa, int port,
config->mac_capabilities = MAC_SYM_PAUSE | MAC_10 | MAC_100 | MAC_1000;
}
+static void vsc73xx_refresh_fwd_map(struct dsa_switch *ds, int port, u8 state)
+{
+ struct dsa_port *other_dp, *dp = dsa_to_port(ds, port);
+ struct vsc73xx *vsc = ds->priv;
+ u16 mask;
+
+ if (state != BR_STATE_FORWARDING) {
+ /* Ports that aren't in the forwarding state must not
+ * forward packets anywhere.
+ */
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_SRCMASKS + port,
+ VSC73XX_SRCMASKS_PORTS_MASK, 0);
+
+ dsa_switch_for_each_available_port(other_dp, ds) {
+ if (other_dp == dp)
+ continue;
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_SRCMASKS + other_dp->index,
+ BIT(port), 0);
+ }
+
+ return;
+ }
+
+ /* Forwarding ports must forward to the CPU and to other ports
+ * in the same bridge
+ */
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_SRCMASKS + CPU_PORT, BIT(port), BIT(port));
+
+ mask = BIT(CPU_PORT);
+
+ dsa_switch_for_each_user_port(other_dp, ds) {
+ int other_port = other_dp->index;
+
+ if (port == other_port || !dsa_port_bridge_same(dp, other_dp) ||
+ other_dp->stp_state != BR_STATE_FORWARDING)
+ continue;
+
+ mask |= BIT(other_port);
+
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_SRCMASKS + other_port,
+ BIT(port), BIT(port));
+ }
+
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_SRCMASKS + port,
+ VSC73XX_SRCMASKS_PORTS_MASK, mask);
+}
+
+/* FIXME: STP frames aren't forwarded at this moment. BPDU frames are
+ * forwarded only from and to PI/SI interface. For more info see chapter
+ * 2.7.1 (CPU Forwarding) in datasheet.
+ * This function is required for tag_8021q operations.
+ */
+static void vsc73xx_port_stp_state_set(struct dsa_switch *ds, int port,
+ u8 state)
+{
+ struct vsc73xx *vsc = ds->priv;
+ u32 val;
+
+ val = (state == BR_STATE_BLOCKING || state == BR_STATE_DISABLED) ?
+ 0 : BIT(port);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_RECVMASK, BIT(port), val);
+
+ val = (state == BR_STATE_LEARNING || state == BR_STATE_FORWARDING) ?
+ BIT(port) : 0;
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
+ VSC73XX_LEARNMASK, BIT(port), val);
+
+ /* CPU Port should always forward packets when user ports are forwarding
+ * so let's configure it from other ports only.
+ */
+ if (port != CPU_PORT)
+ vsc73xx_refresh_fwd_map(ds, port, state);
+}
+
static const struct phylink_mac_ops vsc73xx_phylink_mac_ops = {
.mac_config = vsc73xx_mac_config,
.mac_link_down = vsc73xx_mac_link_down,
@@ -1057,6 +1130,7 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
.port_disable = vsc73xx_port_disable,
.port_change_mtu = vsc73xx_change_mtu,
.port_max_mtu = vsc73xx_get_max_mtu,
+ .port_stp_state_set = vsc73xx_port_stp_state_set,
.phylink_get_caps = vsc73xx_phylink_get_caps,
};
--
2.34.1