[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20211022184312.2454746-6-vladimir.oltean@nxp.com>
Date: Fri, 22 Oct 2021 21:43:08 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
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>,
Claudiu Manoil <claudiu.manoil@....com>
Subject: [PATCH v4 net-next 5/9] net: dsa: lantiq_gswip: serialize access to the PCE table
Looking at the code, the GSWIP switch appears to hold bridging service
structures (VLANs, FDBs, forwarding rules) in PCE table entries.
Hardware access to the PCE table is non-atomic, and is comprised of
several register reads and writes.
These accesses are currently serialized by the rtnl_lock, but DSA is
changing its driver API and that lock will no longer be held when
calling ->port_fdb_add() and ->port_fdb_del().
So this driver needs to serialize the access to the PCE table using its
own locking scheme. This patch adds that.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v3->v4: call mutex_init
drivers/net/dsa/lantiq_gswip.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index dbd4486a173f..1a96df70d1e8 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -276,6 +276,7 @@ struct gswip_priv {
int num_gphy_fw;
struct gswip_gphy_fw *gphy_fw;
u32 port_vlan_filter;
+ struct mutex pce_table_lock;
};
struct gswip_pce_table_entry {
@@ -523,10 +524,14 @@ static int gswip_pce_table_entry_read(struct gswip_priv *priv,
u16 addr_mode = tbl->key_mode ? GSWIP_PCE_TBL_CTRL_OPMOD_KSRD :
GSWIP_PCE_TBL_CTRL_OPMOD_ADRD;
+ mutex_lock(&priv->pce_table_lock);
+
err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL,
GSWIP_PCE_TBL_CTRL_BAS);
- if (err)
+ if (err) {
+ mutex_unlock(&priv->pce_table_lock);
return err;
+ }
gswip_switch_w(priv, tbl->index, GSWIP_PCE_TBL_ADDR);
gswip_switch_mask(priv, GSWIP_PCE_TBL_CTRL_ADDR_MASK |
@@ -536,8 +541,10 @@ static int gswip_pce_table_entry_read(struct gswip_priv *priv,
err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL,
GSWIP_PCE_TBL_CTRL_BAS);
- if (err)
+ if (err) {
+ mutex_unlock(&priv->pce_table_lock);
return err;
+ }
for (i = 0; i < ARRAY_SIZE(tbl->key); i++)
tbl->key[i] = gswip_switch_r(priv, GSWIP_PCE_TBL_KEY(i));
@@ -553,6 +560,8 @@ static int gswip_pce_table_entry_read(struct gswip_priv *priv,
tbl->valid = !!(crtl & GSWIP_PCE_TBL_CTRL_VLD);
tbl->gmap = (crtl & GSWIP_PCE_TBL_CTRL_GMAP_MASK) >> 7;
+ mutex_unlock(&priv->pce_table_lock);
+
return 0;
}
@@ -565,10 +574,14 @@ static int gswip_pce_table_entry_write(struct gswip_priv *priv,
u16 addr_mode = tbl->key_mode ? GSWIP_PCE_TBL_CTRL_OPMOD_KSWR :
GSWIP_PCE_TBL_CTRL_OPMOD_ADWR;
+ mutex_lock(&priv->pce_table_lock);
+
err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL,
GSWIP_PCE_TBL_CTRL_BAS);
- if (err)
+ if (err) {
+ mutex_unlock(&priv->pce_table_lock);
return err;
+ }
gswip_switch_w(priv, tbl->index, GSWIP_PCE_TBL_ADDR);
gswip_switch_mask(priv, GSWIP_PCE_TBL_CTRL_ADDR_MASK |
@@ -600,8 +613,12 @@ static int gswip_pce_table_entry_write(struct gswip_priv *priv,
crtl |= GSWIP_PCE_TBL_CTRL_BAS;
gswip_switch_w(priv, crtl, GSWIP_PCE_TBL_CTRL);
- return gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL,
- GSWIP_PCE_TBL_CTRL_BAS);
+ err = gswip_switch_r_timeout(priv, GSWIP_PCE_TBL_CTRL,
+ GSWIP_PCE_TBL_CTRL_BAS);
+
+ mutex_unlock(&priv->pce_table_lock);
+
+ return err;
}
/* Add the LAN port into a bridge with the CPU port by
@@ -2106,6 +2123,7 @@ static int gswip_probe(struct platform_device *pdev)
priv->ds->priv = priv;
priv->ds->ops = priv->hw_info->ops;
priv->dev = dev;
+ mutex_init(&priv->pce_table_lock);
version = gswip_switch_r(priv, GSWIP_VERSION);
np = dev->of_node;
--
2.25.1
Powered by blists - more mailing lists