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Subject[PATCH net-next v2 2/6] net: dsa: mv88e6xxx: protect FID registers access
Date
Only switch families with 4096 address databases have dedicated FID
registers for ATU and VTU operations.

Factorize the access to the GLOBAL_ATU_FID register and introduce a
mv88e6xxx_has_fid_reg() helper function to protect the access to
GLOBAL_ATU_FID and GLOBAL_VTU_FID.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
---
drivers/net/dsa/mv88e6xxx.c | 42 +++++++++++++++++++++++-------------------
1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 19a8208..cc066dc 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -482,6 +482,16 @@ static bool mv88e6xxx_6352_family(struct dsa_switch *ds)
return false;
}

+static bool mv88e6xxx_has_fid_reg(struct dsa_switch *ds)
+{
+ /* Does the device have dedicated FID registers for ATU and VTU ops? */
+ if (mv88e6xxx_6097_family(ds) || mv88e6xxx_6165_family(ds) ||
+ mv88e6xxx_6351_family(ds) || mv88e6xxx_6352_family(ds))
+ return true;
+
+ return false;
+}
+
static bool mv88e6xxx_has_stu(struct dsa_switch *ds)
{
/* Does the device have STU and dedicated SID registers for VTU ops? */
@@ -961,10 +971,16 @@ out:
return ret;
}

-static int _mv88e6xxx_atu_cmd(struct dsa_switch *ds, u16 cmd)
+static int _mv88e6xxx_atu_cmd(struct dsa_switch *ds, u16 fid, u16 cmd)
{
int ret;

+ if (mv88e6xxx_has_fid_reg(ds)) {
+ ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, fid);
+ if (ret < 0)
+ return ret;
+ }
+
ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_OP, cmd);
if (ret < 0)
return ret;
@@ -1011,11 +1027,6 @@ static int _mv88e6xxx_atu_flush_move(struct dsa_switch *ds,
return err;

if (entry->fid) {
- err = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID,
- entry->fid);
- if (err)
- return err;
-
op = static_too ? GLOBAL_ATU_OP_FLUSH_MOVE_ALL_DB :
GLOBAL_ATU_OP_FLUSH_MOVE_NON_STATIC_DB;
} else {
@@ -1023,7 +1034,7 @@ static int _mv88e6xxx_atu_flush_move(struct dsa_switch *ds,
GLOBAL_ATU_OP_FLUSH_MOVE_NON_STATIC;
}

- return _mv88e6xxx_atu_cmd(ds, op);
+ return _mv88e6xxx_atu_cmd(ds, entry->fid, op);
}

static int _mv88e6xxx_atu_flush(struct dsa_switch *ds, u16 fid, bool static_too)
@@ -1331,8 +1342,7 @@ static int _mv88e6xxx_vtu_getnext(struct dsa_switch *ds,
if (ret < 0)
return ret;

- if (mv88e6xxx_6097_family(ds) || mv88e6xxx_6165_family(ds) ||
- mv88e6xxx_6351_family(ds) || mv88e6xxx_6352_family(ds)) {
+ if (mv88e6xxx_has_fid_reg(ds)) {
ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL,
GLOBAL_VTU_FID);
if (ret < 0)
@@ -1429,7 +1439,9 @@ static int _mv88e6xxx_vtu_loadpurge(struct dsa_switch *ds,
ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_SID, reg);
if (ret < 0)
return ret;
+ }

+ if (mv88e6xxx_has_fid_reg(ds)) {
reg = entry->fid & GLOBAL_VTU_FID_MASK;
ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_FID, reg);
if (ret < 0)
@@ -1976,11 +1988,7 @@ static int _mv88e6xxx_atu_load(struct dsa_switch *ds,
if (ret < 0)
return ret;

- ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, entry->fid);
- if (ret < 0)
- return ret;
-
- return _mv88e6xxx_atu_cmd(ds, GLOBAL_ATU_OP_LOAD_DB);
+ return _mv88e6xxx_atu_cmd(ds, entry->fid, GLOBAL_ATU_OP_LOAD_DB);
}

static int _mv88e6xxx_port_fdb_load(struct dsa_switch *ds, int port,
@@ -2063,11 +2071,7 @@ static int _mv88e6xxx_atu_getnext(struct dsa_switch *ds, u16 fid,
if (ret < 0)
return ret;

- ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, fid);
- if (ret < 0)
- return ret;
-
- ret = _mv88e6xxx_atu_cmd(ds, GLOBAL_ATU_OP_GET_NEXT_DB);
+ ret = _mv88e6xxx_atu_cmd(ds, fid, GLOBAL_ATU_OP_GET_NEXT_DB);
if (ret < 0)
return ret;

--
2.7.4
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