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authorVladimir Oltean <vladimir.oltean@nxp.com>2022-03-12 00:15:19 +0300
committerDavid S. Miller <davem@davemloft.net>2022-03-14 13:36:15 +0300
commit47d75f7822064d024ec9207c0fc1777f983783b7 (patch)
treebcb628614e5c9ee1c07e8f50b06d44e2a6e766f0 /net/dsa/slave.c
parentd538eca85c2aa6ecb5036e6ff47efc93d9f294da (diff)
downloadlinux-47d75f7822064d024ec9207c0fc1777f983783b7.tar.xz
net: dsa: report and change port dscp priority using dcbnl
Similar to the port-based default priority, IEEE 802.1Q-2018 allows the Application Priority Table to define QoS classes (0 to 7) per IP DSCP value (0 to 63). In the absence of an app table entry for a packet with DSCP value X, QoS classification for that packet falls back to other methods (VLAN PCP or port-based default). The presence of an app table for DSCP value X with priority Y makes the hardware classify the packet to QoS class Y. As opposed to the default-prio where DSA exposes only a "set" in dsa_switch_ops (because the port-based default is the fallback, it always exists, either implicitly or explicitly), for DSCP priorities we expose an "add" and a "del". The addition of a DSCP entry means trusting that DSCP priority, the deletion means ignoring it. Drivers that already trust (at least some) DSCP values can describe their configuration in dsa_switch_ops :: port_get_dscp_prio(), which is called for each DSCP value from 0 to 63. Again, there can be more than one dcbnl app table entry for the same DSCP value, DSA chooses the one with the largest configured priority. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa/slave.c')
-rw-r--r--net/dsa/slave.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 97f5da81fe68..f9cecda791d5 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1880,6 +1880,40 @@ dsa_slave_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
return 0;
}
+static int __maybe_unused
+dsa_slave_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ struct dsa_switch *ds = dp->ds;
+ unsigned long mask, new_prio;
+ int err, port = dp->index;
+ u8 dscp = app->protocol;
+
+ if (!ds->ops->port_add_dscp_prio)
+ return -EOPNOTSUPP;
+
+ if (dscp >= 64) {
+ netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
+ dscp);
+ return -EINVAL;
+ }
+
+ err = dcb_ieee_setapp(dev, app);
+ if (err)
+ return err;
+
+ mask = dcb_ieee_getapp_mask(dev, app);
+ new_prio = __fls(mask);
+
+ err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
+ if (err) {
+ dcb_ieee_delapp(dev, app);
+ return err;
+ }
+
+ return 0;
+}
+
static int __maybe_unused dsa_slave_dcbnl_ieee_setapp(struct net_device *dev,
struct dcb_app *app)
{
@@ -1892,6 +1926,8 @@ static int __maybe_unused dsa_slave_dcbnl_ieee_setapp(struct net_device *dev,
return -EOPNOTSUPP;
}
break;
+ case IEEE_8021QAZ_APP_SEL_DSCP:
+ return dsa_slave_dcbnl_add_dscp_prio(dev, app);
default:
return -EOPNOTSUPP;
}
@@ -1924,6 +1960,30 @@ dsa_slave_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
return 0;
}
+static int __maybe_unused
+dsa_slave_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
+{
+ struct dsa_port *dp = dsa_slave_to_port(dev);
+ struct dsa_switch *ds = dp->ds;
+ int err, port = dp->index;
+ u8 dscp = app->protocol;
+
+ if (!ds->ops->port_del_dscp_prio)
+ return -EOPNOTSUPP;
+
+ err = dcb_ieee_delapp(dev, app);
+ if (err)
+ return err;
+
+ err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
+ if (err) {
+ dcb_ieee_setapp(dev, app);
+ return err;
+ }
+
+ return 0;
+}
+
static int __maybe_unused dsa_slave_dcbnl_ieee_delapp(struct net_device *dev,
struct dcb_app *app)
{
@@ -1936,6 +1996,8 @@ static int __maybe_unused dsa_slave_dcbnl_ieee_delapp(struct net_device *dev,
return -EOPNOTSUPP;
}
break;
+ case IEEE_8021QAZ_APP_SEL_DSCP:
+ return dsa_slave_dcbnl_del_dscp_prio(dev, app);
default:
return -EOPNOTSUPP;
}
@@ -1967,6 +2029,30 @@ static int dsa_slave_dcbnl_init(struct net_device *dev)
return err;
}
+ if (ds->ops->port_get_dscp_prio) {
+ int protocol;
+
+ for (protocol = 0; protocol < 64; protocol++) {
+ struct dcb_app app = {
+ .selector = IEEE_8021QAZ_APP_SEL_DSCP,
+ .protocol = protocol,
+ };
+ int prio;
+
+ prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
+ if (prio == -EOPNOTSUPP)
+ continue;
+ if (prio < 0)
+ return prio;
+
+ app.priority = prio;
+
+ err = dcb_ieee_setapp(dev, &app);
+ if (err)
+ return err;
+ }
+ }
+
return 0;
}