From 955222ca5281ee7ded6b899605c055b147a15c73 Mon Sep 17 00:00:00 2001
From: Vivien Didelot <vivien.didelot@gmail.com>
Date: Mon, 19 Aug 2019 16:00:48 -0400
Subject: net: dsa: use a single switch statement for port setup
It is currently difficult to read the different steps involved in the
setup and teardown of ports in the DSA code. Keep it simple with a
single switch statement for each port type: UNUSED, CPU, DSA, or USER.
Also no need to call devlink_port_unregister from within dsa_port_setup
as this step is inconditionally handled by dsa_port_teardown on error.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/dsa/dsa2.c | 87 ++++++++++++++++++++++++++--------------------------------
1 file changed, 39 insertions(+), 48 deletions(-)
(limited to 'net/dsa/dsa2.c')
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 3abd173ebacb..405552ac4c08 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -254,88 +254,79 @@ static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst)
static int dsa_port_setup(struct dsa_port *dp)
{
- enum devlink_port_flavour flavour;
struct dsa_switch *ds = dp->ds;
struct dsa_switch_tree *dst = ds->dst;
- int err = 0;
-
- if (dp->type == DSA_PORT_TYPE_UNUSED)
- return 0;
-
- memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));
- dp->mac = of_get_mac_address(dp->dn);
-
- switch (dp->type) {
- case DSA_PORT_TYPE_CPU:
- flavour = DEVLINK_PORT_FLAVOUR_CPU;
- break;
- case DSA_PORT_TYPE_DSA:
- flavour = DEVLINK_PORT_FLAVOUR_DSA;
- break;
- case DSA_PORT_TYPE_USER: /* fall-through */
- default:
- flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
- break;
- }
-
- /* dp->index is used now as port_number. However
- * CPU and DSA ports should have separate numbering
- * independent from front panel port numbers.
- */
- devlink_port_attrs_set(&dp->devlink_port, flavour,
- dp->index, false, 0,
- (const char *) &dst->index, sizeof(dst->index));
- err = devlink_port_register(ds->devlink, &dp->devlink_port,
- dp->index);
- if (err)
- return err;
+ const unsigned char *id = (const unsigned char *)&dst->index;
+ const unsigned char len = sizeof(dst->index);
+ struct devlink_port *dlp = &dp->devlink_port;
+ struct devlink *dl = ds->devlink;
+ int err;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
break;
case DSA_PORT_TYPE_CPU:
+ memset(dlp, 0, sizeof(*dlp));
+ devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_CPU,
+ dp->index, false, 0, id, len);
+ err = devlink_port_register(dl, dlp, dp->index);
+ if (err)
+ return err;
+
err = dsa_port_link_register_of(dp);
if (err)
- dev_err(ds->dev, "failed to setup link for port %d.%d\n",
- ds->index, dp->index);
+ return err;
break;
case DSA_PORT_TYPE_DSA:
+ memset(dlp, 0, sizeof(*dlp));
+ devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_DSA,
+ dp->index, false, 0, id, len);
+ err = devlink_port_register(dl, dlp, dp->index);
+ if (err)
+ return err;
+
err = dsa_port_link_register_of(dp);
if (err)
- dev_err(ds->dev, "failed to setup link for port %d.%d\n",
- ds->index, dp->index);
+ return err;
break;
case DSA_PORT_TYPE_USER:
+ memset(dlp, 0, sizeof(*dlp));
+ devlink_port_attrs_set(dlp, DEVLINK_PORT_FLAVOUR_PHYSICAL,
+ dp->index, false, 0, id, len);
+ err = devlink_port_register(dl, dlp, dp->index);
+ if (err)
+ return err;
+
+ dp->mac = of_get_mac_address(dp->dn);
err = dsa_slave_create(dp);
if (err)
- dev_err(ds->dev, "failed to create slave for port %d.%d\n",
- ds->index, dp->index);
- else
- devlink_port_type_eth_set(&dp->devlink_port, dp->slave);
+ return err;
+
+ devlink_port_type_eth_set(dlp, dp->slave);
break;
}
- if (err)
- devlink_port_unregister(&dp->devlink_port);
-
- return err;
+ return 0;
}
static void dsa_port_teardown(struct dsa_port *dp)
{
- if (dp->type != DSA_PORT_TYPE_UNUSED)
- devlink_port_unregister(&dp->devlink_port);
+ struct devlink_port *dlp = &dp->devlink_port;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
break;
case DSA_PORT_TYPE_CPU:
dsa_tag_driver_put(dp->tag_ops);
- /* fall-through */
+ devlink_port_unregister(dlp);
+ dsa_port_link_unregister_of(dp);
+ break;
case DSA_PORT_TYPE_DSA:
+ devlink_port_unregister(dlp);
dsa_port_link_unregister_of(dp);
break;
case DSA_PORT_TYPE_USER:
+ devlink_port_unregister(dlp);
if (dp->slave) {
dsa_slave_destroy(dp->slave);
dp->slave = NULL;
--
cgit v1.2.3
From 0394a63acfe2a6e1c08af0eb1a9133ee8650d7bd Mon Sep 17 00:00:00 2001
From: Vivien Didelot <vivien.didelot@gmail.com>
Date: Mon, 19 Aug 2019 16:00:50 -0400
Subject: net: dsa: enable and disable all ports
Call the .port_enable and .port_disable functions for all ports,
not only the user ports, so that drivers may optimize the power
consumption of all ports after a successful setup.
Unused ports are now disabled on setup. CPU and DSA ports are now
enabled on setup and disabled on teardown. User ports were already
enabled at slave creation and disabled at slave destruction.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/dsa/dsa2.c | 11 +++++++++++
1 file changed, 11 insertions(+)
(limited to 'net/dsa/dsa2.c')
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 405552ac4c08..8c4eccb0cfe6 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -264,6 +264,7 @@ static int dsa_port_setup(struct dsa_port *dp)
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
+ dsa_port_disable(dp);
break;
case DSA_PORT_TYPE_CPU:
memset(dlp, 0, sizeof(*dlp));
@@ -274,6 +275,10 @@ static int dsa_port_setup(struct dsa_port *dp)
return err;
err = dsa_port_link_register_of(dp);
+ if (err)
+ return err;
+
+ err = dsa_port_enable(dp, NULL);
if (err)
return err;
break;
@@ -286,6 +291,10 @@ static int dsa_port_setup(struct dsa_port *dp)
return err;
err = dsa_port_link_register_of(dp);
+ if (err)
+ return err;
+
+ err = dsa_port_enable(dp, NULL);
if (err)
return err;
break;
@@ -317,11 +326,13 @@ static void dsa_port_teardown(struct dsa_port *dp)
case DSA_PORT_TYPE_UNUSED:
break;
case DSA_PORT_TYPE_CPU:
+ dsa_port_disable(dp);
dsa_tag_driver_put(dp->tag_ops);
devlink_port_unregister(dlp);
dsa_port_link_unregister_of(dp);
break;
case DSA_PORT_TYPE_DSA:
+ dsa_port_disable(dp);
devlink_port_unregister(dlp);
dsa_port_link_unregister_of(dp);
break;
--
cgit v1.2.3
From e65d45cc351ac5f1c11e6bac5669e536df753664 Mon Sep 17 00:00:00 2001
From: Vivien Didelot <vivien.didelot@gmail.com>
Date: Sun, 25 Aug 2019 13:25:15 -0400
Subject: net: dsa: remove bitmap operations
The bitmap operations were introduced to simplify the switch drivers
in the future, since most of them could implement the common VLAN and
MDB operations (add, del, dump) with simple functions taking all target
ports at once, and thus limiting the number of hardware accesses.
Programming an MDB or VLAN this way in a single operation would clearly
simplify the drivers a lot but would require a new get-set interface
in DSA. The usage of such bitmap from the stack also raised concerned
in the past, leading to the dynamic allocation of a new ds->_bitmap
member in the dsa_switch structure. So let's get rid of them for now.
This commit nicely wraps the ds->ops->port_{mdb,vlan}_{prepare,add}
switch operations into new dsa_switch_{mdb,vlan}_{prepare,add}
variants not using any bitmap argument anymore.
New dsa_switch_{mdb,vlan}_match helpers have been introduced to make
clear which local port of a switch must be programmed with the target
object. While the targeted user port is an obvious candidate, the
DSA links must also be programmed, as well as the CPU port for VLANs.
While at it, also remove local variables that are only used once.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/net/dsa.h | 3 --
net/dsa/dsa2.c | 14 ------
net/dsa/switch.c | 132 ++++++++++++++++++++++++------------------------------
3 files changed, 59 insertions(+), 90 deletions(-)
(limited to 'net/dsa/dsa2.c')
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 147b757ef8ea..96acb14ec1a8 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -275,9 +275,6 @@ struct dsa_switch {
*/
bool vlan_filtering;
- unsigned long *bitmap;
- unsigned long _bitmap;
-
/* Dynamically allocated ports, keep last */
size_t num_ports;
struct dsa_port ports[];
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 8c4eccb0cfe6..f8445fa73448 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -834,20 +834,6 @@ struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
if (!ds)
return NULL;
- /* We avoid allocating memory outside dsa_switch
- * if it is not needed.
- */
- if (n <= sizeof(ds->_bitmap) * 8) {
- ds->bitmap = &ds->_bitmap;
- } else {
- ds->bitmap = devm_kcalloc(dev,
- BITS_TO_LONGS(n),
- sizeof(unsigned long),
- GFP_KERNEL);
- if (unlikely(!ds->bitmap))
- return NULL;
- }
-
ds->dev = dev;
ds->num_ports = n;
diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index 09d9286b27cc..489eb7b430a4 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -128,57 +128,51 @@ static int dsa_switch_fdb_del(struct dsa_switch *ds,
return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
}
-static int
-dsa_switch_mdb_prepare_bitmap(struct dsa_switch *ds,
- const struct switchdev_obj_port_mdb *mdb,
- const unsigned long *bitmap)
+static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
+ struct dsa_notifier_mdb_info *info)
+{
+ if (ds->index == info->sw_index && port == info->port)
+ return true;
+
+ if (dsa_is_dsa_port(ds, port))
+ return true;
+
+ return false;
+}
+
+static int dsa_switch_mdb_prepare(struct dsa_switch *ds,
+ struct dsa_notifier_mdb_info *info)
{
int port, err;
if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
return -EOPNOTSUPP;
- for_each_set_bit(port, bitmap, ds->num_ports) {
- err = ds->ops->port_mdb_prepare(ds, port, mdb);
- if (err)
- return err;
+ for (port = 0; port < ds->num_ports; port++) {
+ if (dsa_switch_mdb_match(ds, port, info)) {
+ err = ds->ops->port_mdb_prepare(ds, port, info->mdb);
+ if (err)
+ return err;
+ }
}
return 0;
}
-static void dsa_switch_mdb_add_bitmap(struct dsa_switch *ds,
- const struct switchdev_obj_port_mdb *mdb,
- const unsigned long *bitmap)
-{
- int port;
-
- if (!ds->ops->port_mdb_add)
- return;
-
- for_each_set_bit(port, bitmap, ds->num_ports)
- ds->ops->port_mdb_add(ds, port, mdb);
-}
-
static int dsa_switch_mdb_add(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
- const struct switchdev_obj_port_mdb *mdb = info->mdb;
- struct switchdev_trans *trans = info->trans;
int port;
- /* Build a mask of Multicast group members */
- bitmap_zero(ds->bitmap, ds->num_ports);
- if (ds->index == info->sw_index)
- set_bit(info->port, ds->bitmap);
- for (port = 0; port < ds->num_ports; port++)
- if (dsa_is_dsa_port(ds, port))
- set_bit(port, ds->bitmap);
+ if (switchdev_trans_ph_prepare(info->trans))
+ return dsa_switch_mdb_prepare(ds, info);
- if (switchdev_trans_ph_prepare(trans))
- return dsa_switch_mdb_prepare_bitmap(ds, mdb, ds->bitmap);
+ if (!ds->ops->port_mdb_add)
+ return 0;
- dsa_switch_mdb_add_bitmap(ds, mdb, ds->bitmap);
+ for (port = 0; port < ds->num_ports; port++)
+ if (dsa_switch_mdb_match(ds, port, info))
+ ds->ops->port_mdb_add(ds, port, info->mdb);
return 0;
}
@@ -186,13 +180,11 @@ static int dsa_switch_mdb_add(struct dsa_switch *ds,
static int dsa_switch_mdb_del(struct dsa_switch *ds,
struct dsa_notifier_mdb_info *info)
{
- const struct switchdev_obj_port_mdb *mdb = info->mdb;
-
if (!ds->ops->port_mdb_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
- return ds->ops->port_mdb_del(ds, info->port, mdb);
+ return ds->ops->port_mdb_del(ds, info->port, info->mdb);
return 0;
}
@@ -234,59 +226,55 @@ static int dsa_port_vlan_check(struct dsa_switch *ds, int port,
(void *)vlan);
}
-static int
-dsa_switch_vlan_prepare_bitmap(struct dsa_switch *ds,
- const struct switchdev_obj_port_vlan *vlan,
- const unsigned long *bitmap)
+static bool dsa_switch_vlan_match(struct dsa_switch *ds, int port,
+ struct dsa_notifier_vlan_info *info)
+{
+ if (ds->index == info->sw_index && port == info->port)
+ return true;
+
+ if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
+ return true;
+
+ return false;
+}
+
+static int dsa_switch_vlan_prepare(struct dsa_switch *ds,
+ struct dsa_notifier_vlan_info *info)
{
int port, err;
if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
return -EOPNOTSUPP;
- for_each_set_bit(port, bitmap, ds->num_ports) {
- err = dsa_port_vlan_check(ds, port, vlan);
- if (err)
- return err;
+ for (port = 0; port < ds->num_ports; port++) {
+ if (dsa_switch_vlan_match(ds, port, info)) {
+ err = dsa_port_vlan_check(ds, port, info->vlan);
+ if (err)
+ return err;
- err = ds->ops->port_vlan_prepare(ds, port, vlan);
- if (err)
- return err;
+ err = ds->ops->port_vlan_prepare(ds, port, info->vlan);
+ if (err)
+ return err;
+ }
}
return 0;
}
-static void
-dsa_switch_vlan_add_bitmap(struct dsa_switch *ds,
- const struct switchdev_obj_port_vlan *vlan,
- const unsigned long *bitmap)
-{
- int port;
-
- for_each_set_bit(port, bitmap, ds->num_ports)
- ds->ops->port_vlan_add(ds, port, vlan);
-}
-
static int dsa_switch_vlan_add(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
- const struct switchdev_obj_port_vlan *vlan = info->vlan;
- struct switchdev_trans *trans = info->trans;
int port;
- /* Build a mask of VLAN members */
- bitmap_zero(ds->bitmap, ds->num_ports);
- if (ds->index == info->sw_index)
- set_bit(info->port, ds->bitmap);
- for (port = 0; port < ds->num_ports; port++)
- if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
- set_bit(port, ds->bitmap);
+ if (switchdev_trans_ph_prepare(info->trans))
+ return dsa_switch_vlan_prepare(ds, info);
- if (switchdev_trans_ph_prepare(trans))
- return dsa_switch_vlan_prepare_bitmap(ds, vlan, ds->bitmap);
+ if (!ds->ops->port_vlan_add)
+ return 0;
- dsa_switch_vlan_add_bitmap(ds, vlan, ds->bitmap);
+ for (port = 0; port < ds->num_ports; port++)
+ if (dsa_switch_vlan_match(ds, port, info))
+ ds->ops->port_vlan_add(ds, port, info->vlan);
return 0;
}
@@ -294,13 +282,11 @@ static int dsa_switch_vlan_add(struct dsa_switch *ds,
static int dsa_switch_vlan_del(struct dsa_switch *ds,
struct dsa_notifier_vlan_info *info)
{
- const struct switchdev_obj_port_vlan *vlan = info->vlan;
-
if (!ds->ops->port_vlan_del)
return -EOPNOTSUPP;
if (ds->index == info->sw_index)
- return ds->ops->port_vlan_del(ds, info->port, vlan);
+ return ds->ops->port_vlan_del(ds, info->port, info->vlan);
return 0;
}
--
cgit v1.2.3
From 4ba0ebbc6cdecb9fad7c551a3d97b172ebc7b2fa Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <olteanv@gmail.com>
Date: Sat, 31 Aug 2019 15:46:19 +0300
Subject: net: dsa: Fix off-by-one number of calls to devlink_port_unregister
When a function such as dsa_slave_create fails, currently the following
stack trace can be seen:
[ 2.038342] sja1105 spi0.1: Probed switch chip: SJA1105T
[ 2.054556] sja1105 spi0.1: Reset switch and programmed static config
[ 2.063837] sja1105 spi0.1: Enabled switch tagging
[ 2.068706] fsl-gianfar soc:ethernet@2d90000 eth2: error -19 setting up slave phy
[ 2.076371] ------------[ cut here ]------------
[ 2.080973] WARNING: CPU: 1 PID: 21 at net/core/devlink.c:6184 devlink_free+0x1b4/0x1c0
[ 2.088954] Modules linked in:
[ 2.092005] CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.3.0-rc6-01360-g41b52e38d2b6-dirty #1746
[ 2.100912] Hardware name: Freescale LS1021A
[ 2.105162] Workqueue: events deferred_probe_work_func
[ 2.110287] [<c03133a4>] (unwind_backtrace) from [<c030d8cc>] (show_stack+0x10/0x14)
[ 2.117992] [<c030d8cc>] (show_stack) from [<c10b08d8>] (dump_stack+0xb4/0xc8)
[ 2.125180] [<c10b08d8>] (dump_stack) from [<c0349d04>] (__warn+0xe0/0xf8)
[ 2.132018] [<c0349d04>] (__warn) from [<c0349e34>] (warn_slowpath_null+0x40/0x48)
[ 2.139549] [<c0349e34>] (warn_slowpath_null) from [<c0f19d74>] (devlink_free+0x1b4/0x1c0)
[ 2.147772] [<c0f19d74>] (devlink_free) from [<c1064fc0>] (dsa_switch_teardown+0x60/0x6c)
[ 2.155907] [<c1064fc0>] (dsa_switch_teardown) from [<c1065950>] (dsa_register_switch+0x8e4/0xaa8)
[ 2.164821] [<c1065950>] (dsa_register_switch) from [<c0ba7fe4>] (sja1105_probe+0x21c/0x2ec)
[ 2.173216] [<c0ba7fe4>] (sja1105_probe) from [<c0b35948>] (spi_drv_probe+0x80/0xa4)
[ 2.180920] [<c0b35948>] (spi_drv_probe) from [<c0a4c1cc>] (really_probe+0x108/0x400)
[ 2.188711] [<c0a4c1cc>] (really_probe) from [<c0a4c694>] (driver_probe_device+0x78/0x1bc)
[ 2.196933] [<c0a4c694>] (driver_probe_device) from [<c0a4a3dc>] (bus_for_each_drv+0x58/0xb8)
[ 2.205414] [<c0a4a3dc>] (bus_for_each_drv) from [<c0a4c024>] (__device_attach+0xd0/0x168)
[ 2.213637] [<c0a4c024>] (__device_attach) from [<c0a4b1d0>] (bus_probe_device+0x84/0x8c)
[ 2.221772] [<c0a4b1d0>] (bus_probe_device) from [<c0a4b72c>] (deferred_probe_work_func+0x84/0xc4)
[ 2.230686] [<c0a4b72c>] (deferred_probe_work_func) from [<c03650a4>] (process_one_work+0x218/0x510)
[ 2.239772] [<c03650a4>] (process_one_work) from [<c03660d8>] (worker_thread+0x2a8/0x5c0)
[ 2.247908] [<c03660d8>] (worker_thread) from [<c036b348>] (kthread+0x148/0x150)
[ 2.255265] [<c036b348>] (kthread) from [<c03010e8>] (ret_from_fork+0x14/0x2c)
[ 2.262444] Exception stack(0xea965fb0 to 0xea965ff8)
[ 2.267466] 5fa0: 00000000 00000000 00000000 00000000
[ 2.275598] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 2.283729] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 2.290333] ---[ end trace ca5d506728a0581a ]---
devlink_free is complaining right here:
WARN_ON(!list_empty(&devlink->port_list));
This happens because devlink_port_unregister is no longer done right
away in dsa_port_setup when a DSA_PORT_TYPE_USER has failed.
Vivien said about this change that:
Also no need to call devlink_port_unregister from within dsa_port_setup
as this step is inconditionally handled by dsa_port_teardown on error.
which is not really true. The devlink_port_unregister function _is_
being called unconditionally from within dsa_port_setup, but not for
this port that just failed, just for the previous ones which were set
up.
ports_teardown:
for (i = 0; i < port; i++)
dsa_port_teardown(&ds->ports[i]);
Initially I was tempted to fix this by extending the "for" loop to also
cover the port that failed during setup. But this could have potentially
unforeseen consequences unrelated to devlink_port or even other types of
ports than user ports, which I can't really test for. For example, if
for some reason devlink_port_register itself would fail, then
unconditionally unregistering it in dsa_port_teardown would not be a
smart idea. The list might go on.
So just make dsa_port_setup undo the setup it had done upon failure, and
let the for loop undo the work of setting up the previous ports, which
are guaranteed to be brought up to a consistent state.
Fixes: 955222ca5281 ("net: dsa: use a single switch statement for port setup")
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/dsa/dsa2.c | 39 +++++++++++++++++++++++++++++----------
1 file changed, 29 insertions(+), 10 deletions(-)
(limited to 'net/dsa/dsa2.c')
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index f8445fa73448..b501c90aabe4 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -259,8 +259,11 @@ static int dsa_port_setup(struct dsa_port *dp)
const unsigned char *id = (const unsigned char *)&dst->index;
const unsigned char len = sizeof(dst->index);
struct devlink_port *dlp = &dp->devlink_port;
+ bool dsa_port_link_registered = false;
+ bool devlink_port_registered = false;
struct devlink *dl = ds->devlink;
- int err;
+ bool dsa_port_enabled = false;
+ int err = 0;
switch (dp->type) {
case DSA_PORT_TYPE_UNUSED:
@@ -272,15 +275,19 @@ static int dsa_port_setup(struct dsa_port *dp)
dp->index, false, 0, id, len);
err = devlink_port_register(dl, dlp, dp->index);
if (err)
- return err;
+ break;
+ devlink_port_registered = true;
err = dsa_port_link_register_of(dp);
if (err)
- return err;
+ break;
+ dsa_port_link_registered = true;
err = dsa_port_enable(dp, NULL);
if (err)
- return err;
+ break;
+ dsa_port_enabled = true;
+
break;
case DSA_PORT_TYPE_DSA:
memset(dlp, 0, sizeof(*dlp));
@@ -288,15 +295,19 @@ static int dsa_port_setup(struct dsa_port *dp)
dp->index, false, 0, id, len);
err = devlink_port_register(dl, dlp, dp->index);
if (err)
- return err;
+ break;
+ devlink_port_registered = true;
err = dsa_port_link_register_of(dp);
if (err)
- return err;
+ break;
+ dsa_port_link_registered = true;
err = dsa_port_enable(dp, NULL);
if (err)
- return err;
+ break;
+ dsa_port_enabled = true;
+
break;
case DSA_PORT_TYPE_USER:
memset(dlp, 0, sizeof(*dlp));
@@ -304,18 +315,26 @@ static int dsa_port_setup(struct dsa_port *dp)
dp->index, false, 0, id, len);
err = devlink_port_register(dl, dlp, dp->index);
if (err)
- return err;
+ break;
+ devlink_port_registered = true;
dp->mac = of_get_mac_address(dp->dn);
err = dsa_slave_create(dp);
if (err)
- return err;
+ break;
devlink_port_type_eth_set(dlp, dp->slave);
break;
}
- return 0;
+ if (err && dsa_port_enabled)
+ dsa_port_disable(dp);
+ if (err && dsa_port_link_registered)
+ dsa_port_link_unregister_of(dp);
+ if (err && devlink_port_registered)
+ devlink_port_unregister(dlp);
+
+ return err;
}
static void dsa_port_teardown(struct dsa_port *dp)
--
cgit v1.2.3
From 23426a25e55a417dc104df08781b6eff95e65f3f Mon Sep 17 00:00:00 2001
From: Andrew Lunn <andrew@lunn.ch>
Date: Thu, 12 Sep 2019 15:16:45 +0200
Subject: net: dsa: Fix load order between DSA drivers and taggers
The DSA core, DSA taggers and DSA drivers all make use of
module_init(). Hence they get initialised at device_initcall() time.
The ordering is non-deterministic. It can be a DSA driver is bound to
a device before the needed tag driver has been initialised, resulting
in the message:
No tagger for this switch
Rather than have this be fatal, return -EPROBE_DEFER so that it is
tried again later once all the needed drivers have been loaded.
Fixes: d3b8c04988ca ("dsa: Add boilerplate helper to register DSA tag driver modules")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/dsa/dsa2.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'net/dsa/dsa2.c')
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 3abd173ebacb..96f787cf9b6e 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -623,6 +623,8 @@ static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master)
tag_protocol = ds->ops->get_tag_protocol(ds, dp->index);
tag_ops = dsa_tag_driver_get(tag_protocol);
if (IS_ERR(tag_ops)) {
+ if (PTR_ERR(tag_ops) == -ENOPROTOOPT)
+ return -EPROBE_DEFER;
dev_warn(ds->dev, "No tagger for this switch\n");
return PTR_ERR(tag_ops);
}
--
cgit v1.2.3