diff options
| -rw-r--r-- | include/net/dsa.h | 5 | ||||
| -rw-r--r-- | net/dsa/dsa2.c | 103 |
2 files changed, 91 insertions, 17 deletions
diff --git a/include/net/dsa.h b/include/net/dsa.h index b52e9b057be4..507082959aa4 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -149,6 +149,11 @@ struct dsa_switch_tree { /* Tagging protocol operations */ const struct dsa_device_ops *tag_ops; + /* Default tagging protocol preferred by the switches in this + * tree. + */ + enum dsa_tag_protocol default_proto; + /* * Configuration data for the platform device that owns * this dsa switch tree instance. diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index d7c22e3a1fbf..b71e87909f0e 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -668,6 +668,30 @@ static const struct devlink_ops dsa_devlink_ops = { .sb_occ_tc_port_bind_get = dsa_devlink_sb_occ_tc_port_bind_get, }; +static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds) +{ + const struct dsa_device_ops *tag_ops = ds->dst->tag_ops; + struct dsa_switch_tree *dst = ds->dst; + int port, err; + + if (tag_ops->proto == dst->default_proto) + return 0; + + for (port = 0; port < ds->num_ports; port++) { + if (!dsa_is_cpu_port(ds, port)) + continue; + + err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto); + if (err) { + dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n", + tag_ops->name, ERR_PTR(err)); + return err; + } + } + + return 0; +} + static int dsa_switch_setup(struct dsa_switch *ds) { struct dsa_devlink_priv *dl_priv; @@ -718,6 +742,10 @@ static int dsa_switch_setup(struct dsa_switch *ds) if (err < 0) goto unregister_notifier; + err = dsa_switch_setup_tag_protocol(ds); + if (err) + goto teardown; + devlink_params_publish(ds->devlink); if (!ds->slave_mii_bus && ds->ops->phy_read) { @@ -1068,34 +1096,60 @@ static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp, return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol); } -static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master) +static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master, + const char *user_protocol) { struct dsa_switch *ds = dp->ds; struct dsa_switch_tree *dst = ds->dst; const struct dsa_device_ops *tag_ops; - enum dsa_tag_protocol tag_protocol; + enum dsa_tag_protocol default_proto; + + /* Find out which protocol the switch would prefer. */ + default_proto = dsa_get_tag_protocol(dp, master); + if (dst->default_proto) { + if (dst->default_proto != default_proto) { + dev_err(ds->dev, + "A DSA switch tree can have only one tagging protocol\n"); + return -EINVAL; + } + } else { + dst->default_proto = default_proto; + } + + /* See if the user wants to override that preference. */ + if (user_protocol) { + if (!ds->ops->change_tag_protocol) { + dev_err(ds->dev, "Tag protocol cannot be modified\n"); + return -EINVAL; + } + + tag_ops = dsa_find_tagger_by_name(user_protocol); + } else { + tag_ops = dsa_tag_driver_get(default_proto); + } + + if (IS_ERR(tag_ops)) { + if (PTR_ERR(tag_ops) == -ENOPROTOOPT) + return -EPROBE_DEFER; + + dev_warn(ds->dev, "No tagger for this switch\n"); + return PTR_ERR(tag_ops); + } - tag_protocol = dsa_get_tag_protocol(dp, master); if (dst->tag_ops) { - if (dst->tag_ops->proto != tag_protocol) { + if (dst->tag_ops != tag_ops) { dev_err(ds->dev, "A DSA switch tree can have only one tagging protocol\n"); + + dsa_tag_driver_put(tag_ops); return -EINVAL; } + /* In the case of multiple CPU ports per switch, the tagging - * protocol is still reference-counted only per switch tree, so - * nothing to do here. + * protocol is still reference-counted only per switch tree. */ + dsa_tag_driver_put(tag_ops); } else { - tag_ops = dsa_tag_driver_get(tag_protocol); - if (IS_ERR(tag_ops)) { - if (PTR_ERR(tag_ops) == -ENOPROTOOPT) - return -EPROBE_DEFER; - dev_warn(ds->dev, "No tagger for this switch\n"); - dp->master = NULL; - return PTR_ERR(tag_ops); - } - dst->tag_ops = tag_ops; } @@ -1104,6 +1158,19 @@ static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master) dsa_port_set_tag_protocol(dp, dst->tag_ops); dp->dst = dst; + /* At this point, the tree may be configured to use a different + * tagger than the one chosen by the switch driver during + * .setup, in the case when a user selects a custom protocol + * through the DT. + * + * This is resolved by syncing the driver with the tree in + * dsa_switch_setup_tag_protocol once .setup has run and the + * driver is ready to accept calls to .change_tag_protocol. If + * the driver does not support the custom protocol at that + * point, the tree is wholly rejected, thereby ensuring that the + * tree and driver are always in agreement on the protocol to + * use. + */ return 0; } @@ -1117,12 +1184,14 @@ static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn) if (ethernet) { struct net_device *master; + const char *user_protocol; master = of_find_net_device_by_node(ethernet); if (!master) return -EPROBE_DEFER; - return dsa_port_parse_cpu(dp, master); + user_protocol = of_get_property(dn, "dsa-tag-protocol", NULL); + return dsa_port_parse_cpu(dp, master, user_protocol); } if (link) @@ -1234,7 +1303,7 @@ static int dsa_port_parse(struct dsa_port *dp, const char *name, dev_put(master); - return dsa_port_parse_cpu(dp, master); + return dsa_port_parse_cpu(dp, master, NULL); } if (!strcmp(name, "dsa")) |