[PATCH net-next 5/6] net: dsa: sja1105: add configuration of port policers
From: Vladimir Oltean
Date: Sat Mar 28 2020 - 20:53:15 EST
From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
This adds partial configuration support for the L2 Policing Table. Out
of the 45 policing entries, only 5 are used (one for each port), in a
shared manner. All 8 traffic classes, and the broadcast policer, are
redirected to a common instance which belongs to the ingress port.
Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
---
drivers/net/dsa/sja1105/sja1105_main.c | 132 +++++++++++++++++++------
1 file changed, 100 insertions(+), 32 deletions(-)
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 763ae1d3bca8..81d2e5e5ce96 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -516,23 +516,56 @@ static int sja1105_init_avb_params(struct sja1105_private *priv)
return 0;
}
+/* The L2 policing table is 2-stage. The table is looked up for each frame
+ * according to the ingress port, whether it was broadcast or not, and the
+ * classified traffic class (given by VLAN PCP). This portion of the lookup is
+ * fixed, and gives access to the SHARINDX, an indirection register pointing
+ * within the policing table itself, which is used to resolve the policer that
+ * will be used for this frame.
+ *
+ * Stage 1 Stage 2
+ * +------------+--------+ +---------------------------------+
+ * |Port 0 TC 0 |SHARINDX| | Policer 0: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * |Port 0 TC 1 |SHARINDX| | Policer 1: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * ... | Policer 2: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * |Port 0 TC 7 |SHARINDX| | Policer 3: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * |Port 1 TC 0 |SHARINDX| | Policer 4: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * ... | Policer 5: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * |Port 1 TC 7 |SHARINDX| | Policer 6: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * ... | Policer 7: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ * |Port 4 TC 7 |SHARINDX| ...
+ * +------------+--------+
+ * |Port 0 BCAST|SHARINDX| ...
+ * +------------+--------+
+ * |Port 1 BCAST|SHARINDX| ...
+ * +------------+--------+
+ * ... ...
+ * +------------+--------+ +---------------------------------+
+ * |Port 4 BCAST|SHARINDX| | Policer 44: Rate, Burst, MTU |
+ * +------------+--------+ +---------------------------------+
+ *
+ * In this driver, we shall use policers 0-4 as statically alocated port
+ * (matchall) policers. So we need to make the SHARINDX for all lookups
+ * corresponding to this ingress port (8 VLAN PCP lookups and 1 broadcast
+ * lookup) equal.
+ * The remaining policers (40) shall be dynamically allocated for flower
+ * policers, where the key is either vlan_prio or dst_mac ff:ff:ff:ff:ff:ff.
+ */
#define SJA1105_RATE_MBPS(speed) (((speed) * 64000) / 1000)
-static void sja1105_setup_policer(struct sja1105_l2_policing_entry *policing,
- 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 = mtu;
- policing[index].partition = 0;
-}
-
static int sja1105_init_l2_policing(struct sja1105_private *priv)
{
struct sja1105_l2_policing_entry *policing;
struct sja1105_table *table;
- int i, j, k;
+ int port, tc;
table = &priv->static_config.tables[BLK_IDX_L2_POLICING];
@@ -551,22 +584,29 @@ static int sja1105_init_l2_policing(struct sja1105_private *priv)
policing = table->entries;
- /* k sweeps through all unicast policers (0-39).
- * bcast sweeps through policers 40-44.
- */
- for (i = 0, k = 0; i < SJA1105_NUM_PORTS; i++) {
- int bcast = (SJA1105_NUM_PORTS * SJA1105_NUM_TC) + i;
+ /* Setup shared indices for the matchall policers */
+ for (port = 0; port < SJA1105_NUM_PORTS; port++) {
+ int bcast = (SJA1105_NUM_PORTS * SJA1105_NUM_TC) + port;
+
+ for (tc = 0; tc < SJA1105_NUM_TC; tc++)
+ policing[port * SJA1105_NUM_TC + tc].sharindx = port;
+
+ policing[bcast].sharindx = port;
+ }
+
+ /* Setup the matchall policer parameters */
+ for (port = 0; port < SJA1105_NUM_PORTS; port++) {
int mtu = VLAN_ETH_FRAME_LEN + ETH_FCS_LEN;
- if (dsa_is_cpu_port(priv->ds, i))
+ if (dsa_is_cpu_port(priv->ds, port))
mtu += VLAN_HLEN;
- for (j = 0; j < SJA1105_NUM_TC; j++, k++)
- sja1105_setup_policer(policing, k, mtu);
-
- /* Set up this port's policer for broadcast traffic */
- sja1105_setup_policer(policing, bcast, mtu);
+ policing[port].smax = 65535; /* Burst size in bytes */
+ policing[port].rate = SJA1105_RATE_MBPS(1000);
+ policing[port].maxlen = mtu;
+ policing[port].partition = 0;
}
+
return 0;
}
@@ -2129,10 +2169,8 @@ static int sja1105_set_ageing_time(struct dsa_switch *ds,
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;
@@ -2141,16 +2179,10 @@ static int sja1105_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
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)
+ if (policing[port].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;
+ policing[port].maxlen = new_mtu;
return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
}
@@ -2250,6 +2282,40 @@ static void sja1105_mirror_del(struct dsa_switch *ds, int port,
mirror->ingress, false);
}
+static int sja1105_port_policer_add(struct dsa_switch *ds, int port,
+ struct dsa_mall_policer_tc_entry *policer)
+{
+ struct sja1105_l2_policing_entry *policing;
+ struct sja1105_private *priv = ds->priv;
+
+ policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
+
+ /* In hardware, every 8 microseconds the credit level is incremented by
+ * the value of RATE bytes divided by 64, up to a maximum of SMAX
+ * bytes.
+ */
+ policing[port].rate = div_u64(512 * policer->rate_bytes_per_sec,
+ 1000000);
+ policing[port].smax = div_u64(policer->rate_bytes_per_sec *
+ PSCHED_NS2TICKS(policer->burst),
+ PSCHED_TICKS_PER_SEC);
+
+ return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
+}
+
+static void sja1105_port_policer_del(struct dsa_switch *ds, int port)
+{
+ struct sja1105_l2_policing_entry *policing;
+ struct sja1105_private *priv = ds->priv;
+
+ policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
+
+ policing[port].rate = SJA1105_RATE_MBPS(1000);
+ policing[port].smax = 65535;
+
+ sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
+}
+
static const struct dsa_switch_ops sja1105_switch_ops = {
.get_tag_protocol = sja1105_get_tag_protocol,
.setup = sja1105_setup,
@@ -2288,6 +2354,8 @@ static const struct dsa_switch_ops sja1105_switch_ops = {
.port_setup_tc = sja1105_port_setup_tc,
.port_mirror_add = sja1105_mirror_add,
.port_mirror_del = sja1105_mirror_del,
+ .port_policer_add = sja1105_port_policer_add,
+ .port_policer_del = sja1105_port_policer_del,
};
static int sja1105_check_device_id(struct sja1105_private *priv)
--
2.17.1