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net: dsa: sja1105: Add support for FDB and MDB management
Currently only the (more difficult) first generation E/T series is supported. Here the TCAM is only 4-way associative, and to know where the hardware will search for a FDB entry, we need to perform the same hash algorithm in order to install the entry in the correct bin. On P/Q/R/S, the TCAM should be fully associative. However the SPI command interface is different, and because I don't have access to a new-generation device at the moment, support for it is TODO. Signed-off-by: Vladimir Oltean <olteanv@gmail.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
8aa9ebccae
commit
291d1e72b7
@ -123,6 +123,8 @@ int sja1105_dynamic_config_write(struct sja1105_private *priv,
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enum sja1105_blk_idx blk_idx,
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int index, void *entry, bool keep);
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u8 sja1105_fdb_hash(struct sja1105_private *priv, const u8 *addr, u16 vid);
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/* Common implementations for the static and dynamic configs */
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size_t sja1105_l2_forwarding_entry_packing(void *buf, void *entry_ptr,
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enum packing_op op);
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@ -487,3 +487,46 @@ int sja1105_dynamic_config_write(struct sja1105_private *priv,
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return 0;
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}
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static u8 sja1105_crc8_add(u8 crc, u8 byte, u8 poly)
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{
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int i;
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for (i = 0; i < 8; i++) {
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if ((crc ^ byte) & (1 << 7)) {
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crc <<= 1;
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crc ^= poly;
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} else {
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crc <<= 1;
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}
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byte <<= 1;
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}
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return crc;
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}
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/* CRC8 algorithm with non-reversed input, non-reversed output,
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* no input xor and no output xor. Code customized for receiving
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* the SJA1105 E/T FDB keys (vlanid, macaddr) as input. CRC polynomial
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* is also received as argument in the Koopman notation that the switch
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* hardware stores it in.
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*/
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u8 sja1105_fdb_hash(struct sja1105_private *priv, const u8 *addr, u16 vid)
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{
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struct sja1105_l2_lookup_params_entry *l2_lookup_params =
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priv->static_config.tables[BLK_IDX_L2_LOOKUP_PARAMS].entries;
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u64 poly_koopman = l2_lookup_params->poly;
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/* Convert polynomial from Koopman to 'normal' notation */
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u8 poly = (u8)(1 + (poly_koopman << 1));
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u64 vlanid = l2_lookup_params->shared_learn ? 0 : vid;
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u64 input = (vlanid << 48) | ether_addr_to_u64(addr);
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u8 crc = 0; /* seed */
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int i;
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/* Mask the eight bytes starting from MSB one at a time */
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for (i = 56; i >= 0; i -= 8) {
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u8 byte = (input & (0xffull << i)) >> i;
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crc = sja1105_crc8_add(crc, byte, poly);
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}
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return crc;
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}
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@ -179,6 +179,9 @@ static int sja1105_init_static_fdb(struct sja1105_private *priv)
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table = &priv->static_config.tables[BLK_IDX_L2_LOOKUP];
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/* We only populate the FDB table through dynamic
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* L2 Address Lookup entries
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*/
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if (table->entry_count) {
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kfree(table->entries);
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table->entry_count = 0;
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@ -689,6 +692,191 @@ static void sja1105_adjust_link(struct dsa_switch *ds, int port,
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sja1105_adjust_port_config(priv, port, phydev->speed, true);
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}
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/* First-generation switches have a 4-way set associative TCAM that
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* holds the FDB entries. An FDB index spans from 0 to 1023 and is comprised of
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* a "bin" (grouping of 4 entries) and a "way" (an entry within a bin).
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* For the placement of a newly learnt FDB entry, the switch selects the bin
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* based on a hash function, and the way within that bin incrementally.
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*/
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static inline int sja1105et_fdb_index(int bin, int way)
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{
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return bin * SJA1105ET_FDB_BIN_SIZE + way;
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}
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static int sja1105_is_fdb_entry_in_bin(struct sja1105_private *priv, int bin,
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const u8 *addr, u16 vid,
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struct sja1105_l2_lookup_entry *match,
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int *last_unused)
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{
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int way;
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for (way = 0; way < SJA1105ET_FDB_BIN_SIZE; way++) {
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struct sja1105_l2_lookup_entry l2_lookup = {0};
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int index = sja1105et_fdb_index(bin, way);
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/* Skip unused entries, optionally marking them
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* into the return value
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*/
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if (sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,
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index, &l2_lookup)) {
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if (last_unused)
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*last_unused = way;
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continue;
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}
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if (l2_lookup.macaddr == ether_addr_to_u64(addr) &&
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l2_lookup.vlanid == vid) {
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if (match)
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*match = l2_lookup;
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return way;
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}
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}
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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_fdb_add(struct dsa_switch *ds, int port,
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const unsigned char *addr, u16 vid)
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{
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struct sja1105_l2_lookup_entry l2_lookup = {0};
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struct sja1105_private *priv = ds->priv;
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struct device *dev = ds->dev;
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int last_unused = -1;
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int bin, way;
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bin = sja1105_fdb_hash(priv, addr, vid);
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way = sja1105_is_fdb_entry_in_bin(priv, bin, addr, vid,
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&l2_lookup, &last_unused);
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if (way >= 0) {
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/* We have an FDB entry. Is our port in the destination
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* mask? If yes, we need to do nothing. If not, we need
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* to rewrite the entry by adding this port to it.
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*/
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if (l2_lookup.destports & BIT(port))
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return 0;
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l2_lookup.destports |= BIT(port);
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} else {
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int index = sja1105et_fdb_index(bin, way);
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/* We don't have an FDB entry. We construct a new one and
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* try to find a place for it within the FDB table.
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*/
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l2_lookup.macaddr = ether_addr_to_u64(addr);
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l2_lookup.destports = BIT(port);
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l2_lookup.vlanid = vid;
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if (last_unused >= 0) {
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way = last_unused;
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} else {
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/* Bin is full, need to evict somebody.
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* Choose victim at random. If you get these messages
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* often, you may need to consider changing the
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* distribution function:
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* static_config[BLK_IDX_L2_LOOKUP_PARAMS].entries->poly
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*/
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get_random_bytes(&way, sizeof(u8));
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way %= SJA1105ET_FDB_BIN_SIZE;
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dev_warn(dev, "Warning, FDB bin %d full while adding entry for %pM. Evicting entry %u.\n",
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bin, addr, way);
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/* Evict entry */
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sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
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index, NULL, false);
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}
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}
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l2_lookup.index = sja1105et_fdb_index(bin, way);
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return sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
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l2_lookup.index, &l2_lookup,
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true);
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}
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static int sja1105_fdb_del(struct dsa_switch *ds, int port,
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const unsigned char *addr, u16 vid)
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{
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struct sja1105_l2_lookup_entry l2_lookup = {0};
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struct sja1105_private *priv = ds->priv;
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int index, bin, way;
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bool keep;
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bin = sja1105_fdb_hash(priv, addr, vid);
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way = sja1105_is_fdb_entry_in_bin(priv, bin, addr, vid,
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&l2_lookup, NULL);
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if (way < 0)
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return 0;
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index = sja1105et_fdb_index(bin, way);
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/* We have an FDB entry. Is our port in the destination mask? If yes,
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* we need to remove it. If the resulting port mask becomes empty, we
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* need to completely evict the FDB entry.
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* Otherwise we just write it back.
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*/
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if (l2_lookup.destports & BIT(port))
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l2_lookup.destports &= ~BIT(port);
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if (l2_lookup.destports)
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keep = true;
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else
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keep = false;
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return sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
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index, &l2_lookup, keep);
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}
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static int sja1105_fdb_dump(struct dsa_switch *ds, int port,
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dsa_fdb_dump_cb_t *cb, void *data)
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{
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struct sja1105_private *priv = ds->priv;
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struct device *dev = ds->dev;
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int i;
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for (i = 0; i < SJA1105_MAX_L2_LOOKUP_COUNT; i++) {
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struct sja1105_l2_lookup_entry l2_lookup = {0};
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u8 macaddr[ETH_ALEN];
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int rc;
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rc = sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,
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i, &l2_lookup);
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/* No fdb entry at i, not an issue */
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if (rc == -EINVAL)
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continue;
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if (rc) {
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dev_err(dev, "Failed to dump FDB: %d\n", rc);
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return rc;
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}
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/* FDB dump callback is per port. This means we have to
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* disregard a valid entry if it's not for this port, even if
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* only to revisit it later. This is inefficient because the
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* 1024-sized FDB table needs to be traversed 4 times through
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* SPI during a 'bridge fdb show' command.
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*/
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if (!(l2_lookup.destports & BIT(port)))
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continue;
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u64_to_ether_addr(l2_lookup.macaddr, macaddr);
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cb(macaddr, l2_lookup.vlanid, false, data);
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}
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return 0;
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}
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/* This callback needs to be present */
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static int sja1105_mdb_prepare(struct dsa_switch *ds, int port,
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const struct switchdev_obj_port_mdb *mdb)
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{
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return 0;
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}
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static void sja1105_mdb_add(struct dsa_switch *ds, int port,
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const struct switchdev_obj_port_mdb *mdb)
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{
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sja1105_fdb_add(ds, port, mdb->addr, mdb->vid);
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}
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static int sja1105_mdb_del(struct dsa_switch *ds, int port,
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const struct switchdev_obj_port_mdb *mdb)
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{
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return sja1105_fdb_del(ds, port, mdb->addr, mdb->vid);
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}
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static int sja1105_bridge_member(struct dsa_switch *ds, int port,
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struct net_device *br, bool member)
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{
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@ -791,8 +979,14 @@ static const struct dsa_switch_ops sja1105_switch_ops = {
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.get_tag_protocol = sja1105_get_tag_protocol,
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.setup = sja1105_setup,
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.adjust_link = sja1105_adjust_link,
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.port_fdb_dump = sja1105_fdb_dump,
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.port_fdb_add = sja1105_fdb_add,
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.port_fdb_del = sja1105_fdb_del,
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.port_bridge_join = sja1105_bridge_join,
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.port_bridge_leave = sja1105_bridge_leave,
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.port_mdb_prepare = sja1105_mdb_prepare,
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.port_mdb_add = sja1105_mdb_add,
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.port_mdb_del = sja1105_mdb_del,
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};
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static int sja1105_check_device_id(struct sja1105_private *priv)
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