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Merge branch 'sja1105-fdb-fixes'

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Vladimir Oltean says:

====================
FDB fixes for NXP SJA1105

I have some upcoming patches that make heavy use of statically installed
FDB entries, and when testing them on SJA1105P/Q/R/S and SJA1110, it
became clear that these switches do not behave reliably at all.

- On SJA1110, a static FDB entry cannot be installed at all
- On SJA1105P/Q/R/S, it is very picky about the inner/outer VLAN type
- Dynamically learned entries will make us not install static ones, or
  even if we do, they might not take effect

Patch 5/6 has a conflict with net-next (sorry), the commit message of
that patch describes how to deal with it. Thanks.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2021-08-02 14:28:28 +01:00
commit cebb5103f0
2 changed files with 84 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/net/dsa/sja1105/sja1105_dynamic_config.c
View File

@ -304,6 +304,15 @@ sja1105pqrs_common_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
hostcmd = SJA1105_HOSTCMD_INVALIDATE;
}
sja1105_packing(p, &hostcmd, 25, 23, size, op);
}
static void
sja1105pqrs_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
enum packing_op op)
{
int entry_size = SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY;
sja1105pqrs_common_l2_lookup_cmd_packing(buf, cmd, op, entry_size);
/* Hack - The hardware takes the 'index' field within
* struct sja1105_l2_lookup_entry as the index on which this command
@ -313,26 +322,18 @@ sja1105pqrs_common_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
* such that our API doesn't need to ask for a full-blown entry
* structure when e.g. a delete is requested.
*/
sja1105_packing(buf, &cmd->index, 15, 6,
SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY, op);
}
static void
sja1105pqrs_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
enum packing_op op)
{
int size = SJA1105PQRS_SIZE_L2_LOOKUP_ENTRY;
return sja1105pqrs_common_l2_lookup_cmd_packing(buf, cmd, op, size);
sja1105_packing(buf, &cmd->index, 15, 6, entry_size, op);
}
static void
sja1110_l2_lookup_cmd_packing(void *buf, struct sja1105_dyn_cmd *cmd,
enum packing_op op)
{
int size = SJA1110_SIZE_L2_LOOKUP_ENTRY;
int entry_size = SJA1110_SIZE_L2_LOOKUP_ENTRY;
return sja1105pqrs_common_l2_lookup_cmd_packing(buf, cmd, op, size);
sja1105pqrs_common_l2_lookup_cmd_packing(buf, cmd, op, entry_size);
sja1105_packing(buf, &cmd->index, 10, 1, entry_size, op);
}
/* The switch is so retarded that it makes our command/entry abstraction

94
drivers/net/dsa/sja1105/sja1105_main.c
View File

@ -1318,10 +1318,11 @@ static int sja1105et_is_fdb_entry_in_bin(struct sja1105_private *priv, int bin,
int sja1105et_fdb_add(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid)
{
struct sja1105_l2_lookup_entry l2_lookup = {0};
struct sja1105_l2_lookup_entry l2_lookup = {0}, tmp;
struct sja1105_private *priv = ds->priv;
struct device *dev = ds->dev;
int last_unused = -1;
int start, end, i;
int bin, way, rc;
bin = sja1105et_fdb_hash(priv, addr, vid);
@ -1333,7 +1334,7 @@ int sja1105et_fdb_add(struct dsa_switch *ds, int port,
* mask? If yes, we need to do nothing. If not, we need
* to rewrite the entry by adding this port to it.
*/
if (l2_lookup.destports & BIT(port))
if ((l2_lookup.destports & BIT(port)) && l2_lookup.lockeds)
return 0;
l2_lookup.destports |= BIT(port);
} else {
@ -1364,6 +1365,7 @@ int sja1105et_fdb_add(struct dsa_switch *ds, int port,
index, NULL, false);
}
}
l2_lookup.lockeds = true;
l2_lookup.index = sja1105et_fdb_index(bin, way);
rc = sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
@ -1372,6 +1374,29 @@ int sja1105et_fdb_add(struct dsa_switch *ds, int port,
if (rc < 0)
return rc;
/* Invalidate a dynamically learned entry if that exists */
start = sja1105et_fdb_index(bin, 0);
end = sja1105et_fdb_index(bin, way);
for (i = start; i < end; i++) {
rc = sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,
i, &tmp);
if (rc == -ENOENT)
continue;
if (rc)
return rc;
if (tmp.macaddr != ether_addr_to_u64(addr) || tmp.vlanid != vid)
continue;
rc = sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
i, NULL, false);
if (rc)
return rc;
break;
}
return sja1105_static_fdb_change(priv, port, &l2_lookup, true);
}
@ -1413,32 +1438,30 @@ int sja1105et_fdb_del(struct dsa_switch *ds, int port,
int sja1105pqrs_fdb_add(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid)
{
struct sja1105_l2_lookup_entry l2_lookup = {0};
struct sja1105_l2_lookup_entry l2_lookup = {0}, tmp;
struct sja1105_private *priv = ds->priv;
int rc, i;
/* Search for an existing entry in the FDB table */
l2_lookup.macaddr = ether_addr_to_u64(addr);
l2_lookup.vlanid = vid;
l2_lookup.iotag = SJA1105_S_TAG;
l2_lookup.mask_macaddr = GENMASK_ULL(ETH_ALEN * 8 - 1, 0);
if (priv->vlan_state != SJA1105_VLAN_UNAWARE) {
l2_lookup.mask_vlanid = VLAN_VID_MASK;
l2_lookup.mask_iotag = BIT(0);
} else {
l2_lookup.mask_vlanid = 0;
l2_lookup.mask_iotag = 0;
}
l2_lookup.mask_vlanid = VLAN_VID_MASK;
l2_lookup.destports = BIT(port);
tmp = l2_lookup;
rc = sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,
SJA1105_SEARCH, &l2_lookup);
if (rc == 0) {
/* Found and this port is already in the entry's
SJA1105_SEARCH, &tmp);
if (rc == 0 && tmp.index != SJA1105_MAX_L2_LOOKUP_COUNT - 1) {
/* Found a static entry and this port is already in the entry's
* port mask => job done
*/
if (l2_lookup.destports & BIT(port))
if ((tmp.destports & BIT(port)) && tmp.lockeds)
return 0;
l2_lookup = tmp;
/* l2_lookup.index is populated by the switch in case it
* found something.
*/
@ -1460,16 +1483,46 @@ int sja1105pqrs_fdb_add(struct dsa_switch *ds, int port,
dev_err(ds->dev, "FDB is full, cannot add entry.\n");
return -EINVAL;
}
l2_lookup.lockeds = true;
l2_lookup.index = i;
skip_finding_an_index:
l2_lookup.lockeds = true;
rc = sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
l2_lookup.index, &l2_lookup,
true);
if (rc < 0)
return rc;
/* The switch learns dynamic entries and looks up the FDB left to
* right. It is possible that our addition was concurrent with the
* dynamic learning of the same address, so now that the static entry
* has been installed, we are certain that address learning for this
* particular address has been turned off, so the dynamic entry either
* is in the FDB at an index smaller than the static one, or isn't (it
* can also be at a larger index, but in that case it is inactive
* because the static FDB entry will match first, and the dynamic one
* will eventually age out). Search for a dynamically learned address
* prior to our static one and invalidate it.
*/
tmp = l2_lookup;
rc = sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,
SJA1105_SEARCH, &tmp);
if (rc < 0) {
dev_err(ds->dev,
"port %d failed to read back entry for %pM vid %d: %pe\n",
port, addr, vid, ERR_PTR(rc));
return rc;
}
if (tmp.index < l2_lookup.index) {
rc = sja1105_dynamic_config_write(priv, BLK_IDX_L2_LOOKUP,
tmp.index, NULL, false);
if (rc < 0)
return rc;
}
return sja1105_static_fdb_change(priv, port, &l2_lookup, true);
}
@ -1483,15 +1536,8 @@ int sja1105pqrs_fdb_del(struct dsa_switch *ds, int port,
l2_lookup.macaddr = ether_addr_to_u64(addr);
l2_lookup.vlanid = vid;
l2_lookup.iotag = SJA1105_S_TAG;
l2_lookup.mask_macaddr = GENMASK_ULL(ETH_ALEN * 8 - 1, 0);
if (priv->vlan_state != SJA1105_VLAN_UNAWARE) {
l2_lookup.mask_vlanid = VLAN_VID_MASK;
l2_lookup.mask_iotag = BIT(0);
} else {
l2_lookup.mask_vlanid = 0;
l2_lookup.mask_iotag = 0;
}
l2_lookup.mask_vlanid = VLAN_VID_MASK;
l2_lookup.destports = BIT(port);
rc = sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,