net: dsa: sja1105: implement VLAN retagging for dsa_8021q sub-VLANs
Expand the delta commit procedure for VLANs with additional logic for treating bridge_vlans in the newly introduced operating mode, SJA1105_VLAN_BEST_EFFORT. For every bridge VLAN on every user port, a sub-VLAN index is calculated and retagging rules are installed towards a dsa_8021q rx_vid that encodes that sub-VLAN index. This way, the tagger can identify the original VLANs. Extra care is taken for VLANs to still work as intended in cross-chip scenarios. Retagging may have unintended consequences for these because a sub-VLAN encoding that works for the CPU does not make any sense for a front-panel port. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean
David S. Miller
parent
aaa270c638
commit
3f01c91aab
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@ -1869,6 +1869,57 @@ sja1105_get_tag_protocol(struct dsa_switch *ds, int port,
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return DSA_TAG_PROTO_SJA1105;
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}
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static int sja1105_find_free_subvlan(u16 *subvlan_map, bool pvid)
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{
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int subvlan;
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if (pvid)
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return 0;
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for (subvlan = 1; subvlan < DSA_8021Q_N_SUBVLAN; subvlan++)
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if (subvlan_map[subvlan] == VLAN_N_VID)
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return subvlan;
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return -1;
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}
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static int sja1105_find_subvlan(u16 *subvlan_map, u16 vid)
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{
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int subvlan;
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for (subvlan = 0; subvlan < DSA_8021Q_N_SUBVLAN; subvlan++)
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if (subvlan_map[subvlan] == vid)
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return subvlan;
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return -1;
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}
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static int sja1105_find_committed_subvlan(struct sja1105_private *priv,
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int port, u16 vid)
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{
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struct sja1105_port *sp = &priv->ports[port];
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return sja1105_find_subvlan(sp->subvlan_map, vid);
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}
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static void sja1105_init_subvlan_map(u16 *subvlan_map)
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{
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int subvlan;
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for (subvlan = 0; subvlan < DSA_8021Q_N_SUBVLAN; subvlan++)
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subvlan_map[subvlan] = VLAN_N_VID;
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}
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static void sja1105_commit_subvlan_map(struct sja1105_private *priv, int port,
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u16 *subvlan_map)
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{
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struct sja1105_port *sp = &priv->ports[port];
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int subvlan;
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for (subvlan = 0; subvlan < DSA_8021Q_N_SUBVLAN; subvlan++)
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sp->subvlan_map[subvlan] = subvlan_map[subvlan];
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}
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static int sja1105_is_vlan_configured(struct sja1105_private *priv, u16 vid)
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{
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struct sja1105_vlan_lookup_entry *vlan;
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@ -1885,9 +1936,29 @@ static int sja1105_is_vlan_configured(struct sja1105_private *priv, u16 vid)
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return -1;
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}
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static int sja1105_commit_vlans(struct sja1105_private *priv,
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struct sja1105_vlan_lookup_entry *new_vlan)
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static int
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sja1105_find_retagging_entry(struct sja1105_retagging_entry *retagging,
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int count, int from_port, u16 from_vid,
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u16 to_vid)
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{
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int i;
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for (i = 0; i < count; i++)
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if (retagging[i].ing_port == BIT(from_port) &&
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retagging[i].vlan_ing == from_vid &&
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retagging[i].vlan_egr == to_vid)
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return i;
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/* Return an invalid entry index if not found */
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return -1;
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}
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static int sja1105_commit_vlans(struct sja1105_private *priv,
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struct sja1105_vlan_lookup_entry *new_vlan,
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struct sja1105_retagging_entry *new_retagging,
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int num_retagging)
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{
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struct sja1105_retagging_entry *retagging;
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struct sja1105_vlan_lookup_entry *vlan;
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struct sja1105_table *table;
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int num_vlans = 0;
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@ -1947,9 +2018,50 @@ static int sja1105_commit_vlans(struct sja1105_private *priv,
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vlan[k++] = new_vlan[i];
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}
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/* VLAN Retagging Table */
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table = &priv->static_config.tables[BLK_IDX_RETAGGING];
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retagging = table->entries;
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for (i = 0; i < table->entry_count; i++) {
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rc = sja1105_dynamic_config_write(priv, BLK_IDX_RETAGGING,
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i, &retagging[i], false);
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if (rc)
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return rc;
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}
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if (table->entry_count)
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kfree(table->entries);
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table->entries = kcalloc(num_retagging, table->ops->unpacked_entry_size,
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GFP_KERNEL);
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if (!table->entries)
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return -ENOMEM;
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table->entry_count = num_retagging;
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retagging = table->entries;
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for (i = 0; i < num_retagging; i++) {
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retagging[i] = new_retagging[i];
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/* Update entry */
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rc = sja1105_dynamic_config_write(priv, BLK_IDX_RETAGGING,
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i, &retagging[i], true);
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if (rc < 0)
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return rc;
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}
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return 0;
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}
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struct sja1105_crosschip_vlan {
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struct list_head list;
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u16 vid;
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bool untagged;
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int port;
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int other_port;
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struct dsa_switch *other_ds;
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};
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struct sja1105_crosschip_switch {
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struct list_head list;
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struct dsa_switch *other_ds;
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@ -2021,6 +2133,265 @@ sja1105_build_dsa_8021q_vlans(struct sja1105_private *priv,
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return 0;
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}
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static int sja1105_build_subvlans(struct sja1105_private *priv,
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u16 subvlan_map[][DSA_8021Q_N_SUBVLAN],
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struct sja1105_vlan_lookup_entry *new_vlan,
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struct sja1105_retagging_entry *new_retagging,
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int *num_retagging)
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{
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struct sja1105_bridge_vlan *v;
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int k = *num_retagging;
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if (priv->vlan_state != SJA1105_VLAN_BEST_EFFORT)
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return 0;
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list_for_each_entry(v, &priv->bridge_vlans, list) {
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int upstream = dsa_upstream_port(priv->ds, v->port);
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int match, subvlan;
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u16 rx_vid;
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/* Only sub-VLANs on user ports need to be applied.
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* Bridge VLANs also include VLANs added automatically
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* by DSA on the CPU port.
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*/
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if (!dsa_is_user_port(priv->ds, v->port))
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continue;
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subvlan = sja1105_find_subvlan(subvlan_map[v->port],
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v->vid);
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if (subvlan < 0) {
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subvlan = sja1105_find_free_subvlan(subvlan_map[v->port],
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v->pvid);
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if (subvlan < 0) {
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dev_err(priv->ds->dev, "No more free subvlans\n");
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return -ENOSPC;
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}
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}
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rx_vid = dsa_8021q_rx_vid_subvlan(priv->ds, v->port, subvlan);
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/* @v->vid on @v->port needs to be retagged to @rx_vid
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* on @upstream. Assume @v->vid on @v->port and on
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* @upstream was already configured by the previous
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* iteration over bridge_vlans.
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*/
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match = rx_vid;
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new_vlan[match].vlanid = rx_vid;
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new_vlan[match].vmemb_port |= BIT(v->port);
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new_vlan[match].vmemb_port |= BIT(upstream);
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new_vlan[match].vlan_bc |= BIT(v->port);
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new_vlan[match].vlan_bc |= BIT(upstream);
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/* The "untagged" flag is set the same as for the
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* original VLAN
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*/
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if (!v->untagged)
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new_vlan[match].tag_port |= BIT(v->port);
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/* But it's always tagged towards the CPU */
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new_vlan[match].tag_port |= BIT(upstream);
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/* The Retagging Table generates packet *clones* with
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* the new VLAN. This is a very odd hardware quirk
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* which we need to suppress by dropping the original
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* packet.
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* Deny egress of the original VLAN towards the CPU
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* port. This will force the switch to drop it, and
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* we'll see only the retagged packets.
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*/
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match = v->vid;
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new_vlan[match].vlan_bc &= ~BIT(upstream);
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/* And the retagging itself */
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new_retagging[k].vlan_ing = v->vid;
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new_retagging[k].vlan_egr = rx_vid;
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new_retagging[k].ing_port = BIT(v->port);
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new_retagging[k].egr_port = BIT(upstream);
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if (k++ == SJA1105_MAX_RETAGGING_COUNT) {
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dev_err(priv->ds->dev, "No more retagging rules\n");
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return -ENOSPC;
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}
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subvlan_map[v->port][subvlan] = v->vid;
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}
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*num_retagging = k;
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return 0;
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}
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/* Sadly, in crosschip scenarios where the CPU port is also the link to another
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* switch, we should retag backwards (the dsa_8021q vid to the original vid) on
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* the CPU port of neighbour switches.
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*/
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static int
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sja1105_build_crosschip_subvlans(struct sja1105_private *priv,
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struct sja1105_vlan_lookup_entry *new_vlan,
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struct sja1105_retagging_entry *new_retagging,
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int *num_retagging)
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{
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struct sja1105_crosschip_vlan *tmp, *pos;
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struct dsa_8021q_crosschip_link *c;
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struct sja1105_bridge_vlan *v, *w;
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struct list_head crosschip_vlans;
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int k = *num_retagging;
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int rc = 0;
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if (priv->vlan_state != SJA1105_VLAN_BEST_EFFORT)
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return 0;
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INIT_LIST_HEAD(&crosschip_vlans);
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list_for_each_entry(c, &priv->crosschip_links, list) {
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struct sja1105_private *other_priv = c->other_ds->priv;
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if (other_priv->vlan_state == SJA1105_VLAN_FILTERING_FULL)
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continue;
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/* Crosschip links are also added to the CPU ports.
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* Ignore those.
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*/
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if (!dsa_is_user_port(priv->ds, c->port))
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continue;
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if (!dsa_is_user_port(c->other_ds, c->other_port))
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continue;
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/* Search for VLANs on the remote port */
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list_for_each_entry(v, &other_priv->bridge_vlans, list) {
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bool already_added = false;
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bool we_have_it = false;
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if (v->port != c->other_port)
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continue;
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/* If @v is a pvid on @other_ds, it does not need
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* re-retagging, because its SVL field is 0 and we
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* already allow that, via the dsa_8021q crosschip
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* links.
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*/
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if (v->pvid)
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continue;
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/* Search for the VLAN on our local port */
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list_for_each_entry(w, &priv->bridge_vlans, list) {
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if (w->port == c->port && w->vid == v->vid) {
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we_have_it = true;
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break;
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}
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}
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if (!we_have_it)
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continue;
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list_for_each_entry(tmp, &crosschip_vlans, list) {
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if (tmp->vid == v->vid &&
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tmp->untagged == v->untagged &&
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tmp->port == c->port &&
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tmp->other_port == v->port &&
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tmp->other_ds == c->other_ds) {
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already_added = true;
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break;
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}
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}
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if (already_added)
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continue;
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tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
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if (!tmp) {
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dev_err(priv->ds->dev, "Failed to allocate memory\n");
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rc = -ENOMEM;
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goto out;
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}
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tmp->vid = v->vid;
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tmp->port = c->port;
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tmp->other_port = v->port;
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tmp->other_ds = c->other_ds;
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tmp->untagged = v->untagged;
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list_add(&tmp->list, &crosschip_vlans);
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}
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}
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list_for_each_entry(tmp, &crosschip_vlans, list) {
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struct sja1105_private *other_priv = tmp->other_ds->priv;
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int upstream = dsa_upstream_port(priv->ds, tmp->port);
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int match, subvlan;
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u16 rx_vid;
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subvlan = sja1105_find_committed_subvlan(other_priv,
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tmp->other_port,
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tmp->vid);
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/* If this happens, it's a bug. The neighbour switch does not
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* have a subvlan for tmp->vid on tmp->other_port, but it
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* should, since we already checked for its vlan_state.
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*/
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if (WARN_ON(subvlan < 0)) {
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rc = -EINVAL;
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goto out;
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}
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rx_vid = dsa_8021q_rx_vid_subvlan(tmp->other_ds,
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tmp->other_port,
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subvlan);
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/* The @rx_vid retagged from @tmp->vid on
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* {@tmp->other_ds, @tmp->other_port} needs to be
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* re-retagged to @tmp->vid on the way back to us.
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*
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* Assume the original @tmp->vid is already configured
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* on this local switch, otherwise we wouldn't be
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* retagging its subvlan on the other switch in the
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* first place. We just need to add a reverse retagging
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* rule for @rx_vid and install @rx_vid on our ports.
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*/
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match = rx_vid;
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new_vlan[match].vlanid = rx_vid;
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new_vlan[match].vmemb_port |= BIT(tmp->port);
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new_vlan[match].vmemb_port |= BIT(upstream);
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/* The "untagged" flag is set the same as for the
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* original VLAN. And towards the CPU, it doesn't
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* really matter, because @rx_vid will only receive
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* traffic on that port. For consistency with other dsa_8021q
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* VLANs, we'll keep the CPU port tagged.
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*/
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if (!tmp->untagged)
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new_vlan[match].tag_port |= BIT(tmp->port);
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new_vlan[match].tag_port |= BIT(upstream);
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/* Deny egress of @rx_vid towards our front-panel port.
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* This will force the switch to drop it, and we'll see
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* only the re-retagged packets (having the original,
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* pre-initial-retagging, VLAN @tmp->vid).
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*/
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new_vlan[match].vlan_bc &= ~BIT(tmp->port);
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/* On reverse retagging, the same ingress VLAN goes to multiple
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* ports. So we have an opportunity to create composite rules
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* to not waste the limited space in the retagging table.
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*/
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k = sja1105_find_retagging_entry(new_retagging, *num_retagging,
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upstream, rx_vid, tmp->vid);
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if (k < 0) {
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if (*num_retagging == SJA1105_MAX_RETAGGING_COUNT) {
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dev_err(priv->ds->dev, "No more retagging rules\n");
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rc = -ENOSPC;
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goto out;
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}
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k = (*num_retagging)++;
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}
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/* And the retagging itself */
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new_retagging[k].vlan_ing = rx_vid;
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new_retagging[k].vlan_egr = tmp->vid;
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new_retagging[k].ing_port = BIT(upstream);
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new_retagging[k].egr_port |= BIT(tmp->port);
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}
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out:
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list_for_each_entry_safe(tmp, pos, &crosschip_vlans, list) {
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list_del(&tmp->list);
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kfree(tmp);
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}
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return rc;
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}
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static int sja1105_build_vlan_table(struct sja1105_private *priv, bool notify);
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static int sja1105_notify_crosschip_switches(struct sja1105_private *priv)
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@ -2074,10 +2445,12 @@ out:
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static int sja1105_build_vlan_table(struct sja1105_private *priv, bool notify)
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{
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u16 subvlan_map[SJA1105_NUM_PORTS][DSA_8021Q_N_SUBVLAN];
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struct sja1105_retagging_entry *new_retagging;
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struct sja1105_vlan_lookup_entry *new_vlan;
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struct sja1105_table *table;
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int i, num_retagging = 0;
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int rc;
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int i;
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table = &priv->static_config.tables[BLK_IDX_VLAN_LOOKUP];
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new_vlan = kcalloc(VLAN_N_VID,
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@ -2085,9 +2458,23 @@ static int sja1105_build_vlan_table(struct sja1105_private *priv, bool notify)
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if (!new_vlan)
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return -ENOMEM;
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table = &priv->static_config.tables[BLK_IDX_VLAN_LOOKUP];
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new_retagging = kcalloc(SJA1105_MAX_RETAGGING_COUNT,
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table->ops->unpacked_entry_size, GFP_KERNEL);
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if (!new_retagging) {
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kfree(new_vlan);
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return -ENOMEM;
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}
|
||||
|
||||
for (i = 0; i < VLAN_N_VID; i++)
|
||||
new_vlan[i].vlanid = VLAN_N_VID;
|
||||
|
||||
for (i = 0; i < SJA1105_MAX_RETAGGING_COUNT; i++)
|
||||
new_retagging[i].vlan_ing = VLAN_N_VID;
|
||||
|
||||
for (i = 0; i < priv->ds->num_ports; i++)
|
||||
sja1105_init_subvlan_map(subvlan_map[i]);
|
||||
|
||||
/* Bridge VLANs */
|
||||
rc = sja1105_build_bridge_vlans(priv, new_vlan);
|
||||
if (rc)
|
||||
|
|
@ -2102,7 +2489,22 @@ static int sja1105_build_vlan_table(struct sja1105_private *priv, bool notify)
|
|||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = sja1105_commit_vlans(priv, new_vlan);
|
||||
/* Private VLANs necessary for dsa_8021q operation, which we need to
|
||||
* determine on our own:
|
||||
* - Sub-VLANs
|
||||
* - Sub-VLANs of crosschip switches
|
||||
*/
|
||||
rc = sja1105_build_subvlans(priv, subvlan_map, new_vlan, new_retagging,
|
||||
&num_retagging);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = sja1105_build_crosschip_subvlans(priv, new_vlan, new_retagging,
|
||||
&num_retagging);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = sja1105_commit_vlans(priv, new_vlan, new_retagging, num_retagging);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
|
|
@ -2110,6 +2512,9 @@ static int sja1105_build_vlan_table(struct sja1105_private *priv, bool notify)
|
|||
if (rc)
|
||||
goto out;
|
||||
|
||||
for (i = 0; i < priv->ds->num_ports; i++)
|
||||
sja1105_commit_subvlan_map(priv, i, subvlan_map[i]);
|
||||
|
||||
if (notify) {
|
||||
rc = sja1105_notify_crosschip_switches(priv);
|
||||
if (rc)
|
||||
|
|
@ -2118,6 +2523,7 @@ static int sja1105_build_vlan_table(struct sja1105_private *priv, bool notify)
|
|||
|
||||
out:
|
||||
kfree(new_vlan);
|
||||
kfree(new_retagging);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue