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Date: Sat, 23 Nov 2019 21:48:43 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
davem@...emloft.net, jakub.kicinski@...ronome.com
Cc: netdev@...r.kernel.org, Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH net-next 2/3] net: dsa: sja1105: Implement the port MTU callbacks
On this switch, the frame length enforcements are performed by the
ingress policers. There are 2 types of those: regular L2 (also called
best-effort) and Virtual Link policers (an ARINC664/AFDX concept for
defining L2 streams with certain QoS abilities). To avoid future
confusion, I prefer to call the reset reason "Best-effort policers",
even though the VL policers are not yet supported.
We also need to change the setup of the initial static config, such that
DSA calls to .change_mtu (which are expensive) become no-ops and don't
reset the switch 5 times.
A driver-level decision is to unconditionally allow single VLAN-tagged
traffic on all ports. The CPU port must accept an additional VLAN header
for the DSA tag, which is again a driver-level decision.
The policers actually count bytes not only from the SDU, but also from
the Ethernet header and FCS, so those need to be accounted for as well.
Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
drivers/net/dsa/sja1105/sja1105.h | 1 +
drivers/net/dsa/sja1105/sja1105_main.c | 48 +++++++++++++++++++++++---
2 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/drivers/net/dsa/sja1105/sja1105.h b/drivers/net/dsa/sja1105/sja1105.h
index d801fc204d19..3a5c8acb6e2a 100644
--- a/drivers/net/dsa/sja1105/sja1105.h
+++ b/drivers/net/dsa/sja1105/sja1105.h
@@ -122,6 +122,7 @@ enum sja1105_reset_reason {
SJA1105_RX_HWTSTAMPING,
SJA1105_AGEING_TIME,
SJA1105_SCHEDULING,
+ SJA1105_BEST_EFFORT_POLICING,
};
int sja1105_static_config_reload(struct sja1105_private *priv,
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index b60224c55244..3d55dd3c7e83 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -459,12 +459,12 @@ static int sja1105_init_general_params(struct sja1105_private *priv)
#define SJA1105_RATE_MBPS(speed) (((speed) * 64000) / 1000)
static void sja1105_setup_policer(struct sja1105_l2_policing_entry *policing,
- int index)
+ int index, int mtu)
{
policing[index].sharindx = index;
policing[index].smax = 65535; /* Burst size in bytes */
policing[index].rate = SJA1105_RATE_MBPS(1000);
- policing[index].maxlen = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
+ policing[index].maxlen = mtu;
policing[index].partition = 0;
}
@@ -496,12 +496,16 @@ static int sja1105_init_l2_policing(struct sja1105_private *priv)
*/
for (i = 0, k = 0; i < SJA1105_NUM_PORTS; i++) {
int bcast = (SJA1105_NUM_PORTS * SJA1105_NUM_TC) + i;
+ int mtu = VLAN_ETH_FRAME_LEN + ETH_FCS_LEN;
+
+ if (dsa_is_cpu_port(priv->ds, i))
+ mtu += VLAN_HLEN;
for (j = 0; j < SJA1105_NUM_TC; j++, k++)
- sja1105_setup_policer(policing, k);
+ sja1105_setup_policer(policing, k, mtu);
/* Set up this port's policer for broadcast traffic */
- sja1105_setup_policer(policing, bcast);
+ sja1105_setup_policer(policing, bcast, mtu);
}
return 0;
}
@@ -1346,6 +1350,7 @@ static const char * const sja1105_reset_reasons[] = {
[SJA1105_RX_HWTSTAMPING] = "RX timestamping",
[SJA1105_AGEING_TIME] = "Ageing time",
[SJA1105_SCHEDULING] = "Time-aware scheduling",
+ [SJA1105_BEST_EFFORT_POLICING] = "Best-effort policing",
};
/* For situations where we need to change a setting at runtime that is only
@@ -1886,6 +1891,39 @@ static int sja1105_set_ageing_time(struct dsa_switch *ds,
return sja1105_static_config_reload(priv, SJA1105_AGEING_TIME);
}
+static int sja1105_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
+{
+ int bcast = (SJA1105_NUM_PORTS * SJA1105_NUM_TC) + port;
+ struct sja1105_l2_policing_entry *policing;
+ struct sja1105_private *priv = ds->priv;
+ int tc;
+
+ new_mtu += VLAN_ETH_HLEN + ETH_FCS_LEN;
+
+ if (dsa_is_cpu_port(ds, port))
+ new_mtu += VLAN_HLEN;
+
+ policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
+
+ /* We set all 9 port policers to the same value, so just checking the
+ * broadcast one is fine.
+ */
+ if (policing[bcast].maxlen == new_mtu)
+ return 0;
+
+ for (tc = 0; tc < SJA1105_NUM_TC; tc++)
+ policing[port * SJA1105_NUM_TC + tc].maxlen = new_mtu;
+
+ policing[bcast].maxlen = new_mtu;
+
+ return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
+}
+
+static int sja1105_get_max_mtu(struct dsa_switch *ds, int port)
+{
+ return 2043 - VLAN_ETH_HLEN - ETH_FCS_LEN;
+}
+
static int sja1105_port_setup_tc(struct dsa_switch *ds, int port,
enum tc_setup_type type,
void *type_data)
@@ -1981,6 +2019,8 @@ static const struct dsa_switch_ops sja1105_switch_ops = {
.setup = sja1105_setup,
.teardown = sja1105_teardown,
.set_ageing_time = sja1105_set_ageing_time,
+ .change_mtu = sja1105_change_mtu,
+ .get_max_mtu = sja1105_get_max_mtu,
.phylink_validate = sja1105_phylink_validate,
.phylink_mac_config = sja1105_mac_config,
.phylink_mac_link_up = sja1105_mac_link_up,
--
2.17.1
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