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Message-Id: <20211022141616.2088304-5-vladimir.oltean@nxp.com>
Date: Fri, 22 Oct 2021 17:16:11 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
UNGLinuxDriver@...rochip.com, DENG Qingfang <dqfext@...il.com>,
Kurt Kanzenbach <kurt@...utronix.de>,
Hauke Mehrtens <hauke@...ke-m.de>,
Woojung Huh <woojung.huh@...rochip.com>,
Sean Wang <sean.wang@...iatek.com>,
Landen Chao <Landen.Chao@...iatek.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
George McCollister <george.mccollister@...il.com>,
John Crispin <john@...ozen.org>,
Aleksander Jan Bajkowski <olek2@...pl>,
Egil Hjelmeland <privat@...l-hjelmeland.no>,
Oleksij Rempel <o.rempel@...gutronix.de>,
Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>,
Ansuel Smith <ansuelsmth@...il.com>,
Alvin Šipraga <alsi@...g-olufsen.dk>
Subject: [PATCH v2 net-next 4/9] net: dsa: b53: serialize access to the ARL table
The b53 driver performs non-atomic transactions to the ARL table when
adding, deleting and reading FDB and MDB entries.
Traditionally these were all serialized by the rtnl_lock(), but now it
is possible that DSA calls ->port_fdb_add and ->port_fdb_del without
holding that lock.
So the driver must have its own serialization logic. Add a mutex and
hold it from all entry points (->port_fdb_{add,del,dump},
->port_mdb_{add,del}).
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
drivers/net/dsa/b53/b53_common.c | 41 +++++++++++++++++++++++++++-----
drivers/net/dsa/b53/b53_priv.h | 1 +
2 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 06279ba64cc8..22a6e3934a6f 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1630,6 +1630,7 @@ static int b53_arl_read(struct b53_device *dev, u64 mac,
return -ENOENT;
}
+/* Caller must hold &dev->arl_mutex */
static int b53_arl_op(struct b53_device *dev, int op, int port,
const unsigned char *addr, u16 vid, bool is_valid)
{
@@ -1709,6 +1710,7 @@ int b53_fdb_add(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid)
{
struct b53_device *priv = ds->priv;
+ int ret;
/* 5325 and 5365 require some more massaging, but could
* be supported eventually
@@ -1716,7 +1718,11 @@ int b53_fdb_add(struct dsa_switch *ds, int port,
if (is5325(priv) || is5365(priv))
return -EOPNOTSUPP;
- return b53_arl_op(priv, 0, port, addr, vid, true);
+ mutex_lock(&priv->arl_mutex);
+ ret = b53_arl_op(priv, 0, port, addr, vid, true);
+ mutex_unlock(&priv->arl_mutex);
+
+ return ret;
}
EXPORT_SYMBOL(b53_fdb_add);
@@ -1724,8 +1730,13 @@ int b53_fdb_del(struct dsa_switch *ds, int port,
const unsigned char *addr, u16 vid)
{
struct b53_device *priv = ds->priv;
+ int ret;
- return b53_arl_op(priv, 0, port, addr, vid, false);
+ mutex_lock(&priv->arl_mutex);
+ ret = b53_arl_op(priv, 0, port, addr, vid, false);
+ mutex_unlock(&priv->arl_mutex);
+
+ return ret;
}
EXPORT_SYMBOL(b53_fdb_del);
@@ -1782,25 +1793,33 @@ int b53_fdb_dump(struct dsa_switch *ds, int port,
int ret;
u8 reg;
+ mutex_lock(&priv->arl_mutex);
+
/* Start search operation */
reg = ARL_SRCH_STDN;
b53_write8(priv, B53_ARLIO_PAGE, B53_ARL_SRCH_CTL, reg);
do {
ret = b53_arl_search_wait(priv);
- if (ret)
+ if (ret) {
+ mutex_unlock(&priv->arl_mutex);
return ret;
+ }
b53_arl_search_rd(priv, 0, &results[0]);
ret = b53_fdb_copy(port, &results[0], cb, data);
- if (ret)
+ if (ret) {
+ mutex_unlock(&priv->arl_mutex);
return ret;
+ }
if (priv->num_arl_bins > 2) {
b53_arl_search_rd(priv, 1, &results[1]);
ret = b53_fdb_copy(port, &results[1], cb, data);
- if (ret)
+ if (ret) {
+ mutex_unlock(&priv->arl_mutex);
return ret;
+ }
if (!results[0].is_valid && !results[1].is_valid)
break;
@@ -1808,6 +1827,8 @@ int b53_fdb_dump(struct dsa_switch *ds, int port,
} while (count++ < b53_max_arl_entries(priv) / 2);
+ mutex_unlock(&priv->arl_mutex);
+
return 0;
}
EXPORT_SYMBOL(b53_fdb_dump);
@@ -1816,6 +1837,7 @@ int b53_mdb_add(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_mdb *mdb)
{
struct b53_device *priv = ds->priv;
+ int ret;
/* 5325 and 5365 require some more massaging, but could
* be supported eventually
@@ -1823,7 +1845,11 @@ int b53_mdb_add(struct dsa_switch *ds, int port,
if (is5325(priv) || is5365(priv))
return -EOPNOTSUPP;
- return b53_arl_op(priv, 0, port, mdb->addr, mdb->vid, true);
+ mutex_lock(&priv->arl_mutex);
+ ret = b53_arl_op(priv, 0, port, mdb->addr, mdb->vid, true);
+ mutex_unlock(&priv->arl_mutex);
+
+ return ret;
}
EXPORT_SYMBOL(b53_mdb_add);
@@ -1833,7 +1859,9 @@ int b53_mdb_del(struct dsa_switch *ds, int port,
struct b53_device *priv = ds->priv;
int ret;
+ mutex_lock(&priv->arl_mutex);
ret = b53_arl_op(priv, 0, port, mdb->addr, mdb->vid, false);
+ mutex_unlock(&priv->arl_mutex);
if (ret)
dev_err(ds->dev, "failed to delete MDB entry\n");
@@ -2670,6 +2698,7 @@ struct b53_device *b53_switch_alloc(struct device *base,
mutex_init(&dev->reg_mutex);
mutex_init(&dev->stats_mutex);
+ mutex_init(&dev->arl_mutex);
return dev;
}
diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index 544101e74bca..579da74ada64 100644
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -107,6 +107,7 @@ struct b53_device {
struct mutex reg_mutex;
struct mutex stats_mutex;
+ struct mutex arl_mutex;
const struct b53_io_ops *ops;
/* chip specific data */
--
2.25.1
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