2019-05-27 09:55:01 +03:00
// SPDX-License-Identifier: GPL-2.0-or-later
2014-11-28 16:34:17 +03:00
/*
* net / switchdev / switchdev . c - Switch device API
2015-09-24 11:02:41 +03:00
* Copyright ( c ) 2014 - 2015 Jiri Pirko < jiri @ resnulli . us >
2015-03-09 23:59:09 +03:00
* Copyright ( c ) 2014 - 2015 Scott Feldman < sfeldma @ gmail . com >
2014-11-28 16:34:17 +03:00
*/
# include <linux/kernel.h>
# include <linux/types.h>
# include <linux/init.h>
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# include <linux/mutex.h>
# include <linux/notifier.h>
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# include <linux/netdevice.h>
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# include <linux/etherdevice.h>
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# include <linux/if_bridge.h>
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# include <linux/list.h>
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# include <linux/workqueue.h>
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# include <linux/if_vlan.h>
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# include <linux/rtnetlink.h>
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# include <net/switchdev.h>
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static LIST_HEAD ( deferred ) ;
static DEFINE_SPINLOCK ( deferred_lock ) ;
typedef void switchdev_deferred_func_t ( struct net_device * dev ,
const void * data ) ;
struct switchdev_deferred_item {
struct list_head list ;
struct net_device * dev ;
switchdev_deferred_func_t * func ;
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unsigned long data [ ] ;
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} ;
static struct switchdev_deferred_item * switchdev_deferred_dequeue ( void )
{
struct switchdev_deferred_item * dfitem ;
spin_lock_bh ( & deferred_lock ) ;
if ( list_empty ( & deferred ) ) {
dfitem = NULL ;
goto unlock ;
}
dfitem = list_first_entry ( & deferred ,
struct switchdev_deferred_item , list ) ;
list_del ( & dfitem - > list ) ;
unlock :
spin_unlock_bh ( & deferred_lock ) ;
return dfitem ;
}
/**
* switchdev_deferred_process - Process ops in deferred queue
*
* Called to flush the ops currently queued in deferred ops queue .
* rtnl_lock must be held .
*/
void switchdev_deferred_process ( void )
{
struct switchdev_deferred_item * dfitem ;
ASSERT_RTNL ( ) ;
while ( ( dfitem = switchdev_deferred_dequeue ( ) ) ) {
dfitem - > func ( dfitem - > dev , dfitem - > data ) ;
dev_put ( dfitem - > dev ) ;
kfree ( dfitem ) ;
}
}
EXPORT_SYMBOL_GPL ( switchdev_deferred_process ) ;
static void switchdev_deferred_process_work ( struct work_struct * work )
{
rtnl_lock ( ) ;
switchdev_deferred_process ( ) ;
rtnl_unlock ( ) ;
}
static DECLARE_WORK ( deferred_process_work , switchdev_deferred_process_work ) ;
static int switchdev_deferred_enqueue ( struct net_device * dev ,
const void * data , size_t data_len ,
switchdev_deferred_func_t * func )
{
struct switchdev_deferred_item * dfitem ;
dfitem = kmalloc ( sizeof ( * dfitem ) + data_len , GFP_ATOMIC ) ;
if ( ! dfitem )
return - ENOMEM ;
dfitem - > dev = dev ;
dfitem - > func = func ;
memcpy ( dfitem - > data , data , data_len ) ;
dev_hold ( dev ) ;
spin_lock_bh ( & deferred_lock ) ;
list_add_tail ( & dfitem - > list , & deferred ) ;
spin_unlock_bh ( & deferred_lock ) ;
schedule_work ( & deferred_process_work ) ;
return 0 ;
}
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static int switchdev_port_attr_notify ( enum switchdev_notifier_type nt ,
struct net_device * dev ,
net: switchdev: remove the transaction structure from port attributes
Since the introduction of the switchdev API, port attributes were
transmitted to drivers for offloading using a two-step transactional
model, with a prepare phase that was supposed to catch all errors, and a
commit phase that was supposed to never fail.
Some classes of failures can never be avoided, like hardware access, or
memory allocation. In the latter case, merely attempting to move the
memory allocation to the preparation phase makes it impossible to avoid
memory leaks, since commit 91cf8eceffc1 ("switchdev: Remove unused
transaction item queue") which has removed the unused mechanism of
passing on the allocated memory between one phase and another.
It is time we admit that separating the preparation from the commit
phase is something that is best left for the driver to decide, and not
something that should be baked into the API, especially since there are
no switchdev callers that depend on this.
This patch removes the struct switchdev_trans member from switchdev port
attribute notifier structures, and converts drivers to not look at this
member.
In part, this patch contains a revert of my previous commit 2e554a7a5d8a
("net: dsa: propagate switchdev vlan_filtering prepare phase to
drivers").
For the most part, the conversion was trivial except for:
- Rocker's world implementation based on Broadcom OF-DPA had an odd
implementation of ofdpa_port_attr_bridge_flags_set. The conversion was
done mechanically, by pasting the implementation twice, then only
keeping the code that would get executed during prepare phase on top,
then only keeping the code that gets executed during the commit phase
on bottom, then simplifying the resulting code until this was obtained.
- DSA's offloading of STP state, bridge flags, VLAN filtering and
multicast router could be converted right away. But the ageing time
could not, so a shim was introduced and this was left for a further
commit.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> # hellcreek
Reviewed-by: Linus Walleij <linus.walleij@linaro.org> # RTL8366RB
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-09 03:01:50 +03:00
const struct switchdev_attr * attr )
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
{
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int err ;
int rc ;
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
2019-02-27 22:44:31 +03:00
struct switchdev_notifier_port_attr_info attr_info = {
. attr = attr ,
. handled = false ,
} ;
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
2019-02-27 22:44:31 +03:00
rc = call_switchdev_blocking_notifiers ( nt , dev ,
& attr_info . info , NULL ) ;
err = notifier_to_errno ( rc ) ;
if ( err ) {
WARN_ON ( ! attr_info . handled ) ;
return err ;
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
}
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if ( ! attr_info . handled )
return - EOPNOTSUPP ;
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2019-02-27 22:44:31 +03:00
return 0 ;
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
}
2015-10-14 20:40:50 +03:00
static int switchdev_port_attr_set_now ( struct net_device * dev ,
const struct switchdev_attr * attr )
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
{
net: switchdev: remove the transaction structure from port attributes
Since the introduction of the switchdev API, port attributes were
transmitted to drivers for offloading using a two-step transactional
model, with a prepare phase that was supposed to catch all errors, and a
commit phase that was supposed to never fail.
Some classes of failures can never be avoided, like hardware access, or
memory allocation. In the latter case, merely attempting to move the
memory allocation to the preparation phase makes it impossible to avoid
memory leaks, since commit 91cf8eceffc1 ("switchdev: Remove unused
transaction item queue") which has removed the unused mechanism of
passing on the allocated memory between one phase and another.
It is time we admit that separating the preparation from the commit
phase is something that is best left for the driver to decide, and not
something that should be baked into the API, especially since there are
no switchdev callers that depend on this.
This patch removes the struct switchdev_trans member from switchdev port
attribute notifier structures, and converts drivers to not look at this
member.
In part, this patch contains a revert of my previous commit 2e554a7a5d8a
("net: dsa: propagate switchdev vlan_filtering prepare phase to
drivers").
For the most part, the conversion was trivial except for:
- Rocker's world implementation based on Broadcom OF-DPA had an odd
implementation of ofdpa_port_attr_bridge_flags_set. The conversion was
done mechanically, by pasting the implementation twice, then only
keeping the code that would get executed during prepare phase on top,
then only keeping the code that gets executed during the commit phase
on bottom, then simplifying the resulting code until this was obtained.
- DSA's offloading of STP state, bridge flags, VLAN filtering and
multicast router could be converted right away. But the ageing time
could not, so a shim was introduced and this was left for a further
commit.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> # hellcreek
Reviewed-by: Linus Walleij <linus.walleij@linaro.org> # RTL8366RB
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-09 03:01:50 +03:00
return switchdev_port_attr_notify ( SWITCHDEV_PORT_ATTR_SET , dev , attr ) ;
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
}
2015-10-14 20:40:50 +03:00
static void switchdev_port_attr_set_deferred ( struct net_device * dev ,
const void * data )
{
const struct switchdev_attr * attr = data ;
int err ;
err = switchdev_port_attr_set_now ( dev , attr ) ;
if ( err & & err ! = - EOPNOTSUPP )
netdev_err ( dev , " failed (err=%d) to set attribute (id=%d) \n " ,
err , attr - > id ) ;
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if ( attr - > complete )
attr - > complete ( dev , err , attr - > complete_priv ) ;
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}
static int switchdev_port_attr_set_defer ( struct net_device * dev ,
const struct switchdev_attr * attr )
{
return switchdev_deferred_enqueue ( dev , attr , sizeof ( * attr ) ,
switchdev_port_attr_set_deferred ) ;
}
/**
* switchdev_port_attr_set - Set port attribute
*
* @ dev : port device
* @ attr : attribute to set
*
* rtnl_lock must be held and must not be in atomic section ,
* in case SWITCHDEV_F_DEFER flag is not set .
*/
int switchdev_port_attr_set ( struct net_device * dev ,
const struct switchdev_attr * attr )
{
if ( attr - > flags & SWITCHDEV_F_DEFER )
return switchdev_port_attr_set_defer ( dev , attr ) ;
ASSERT_RTNL ( ) ;
return switchdev_port_attr_set_now ( dev , attr ) ;
}
switchdev: introduce get/set attrs ops
Add two new swdev ops for get/set switch port attributes. Most swdev
interactions on a port are gets or sets on port attributes, so rather than
adding ops for each attribute, let's define clean get/set ops for all
attributes, and then we can have clear, consistent rules on how attributes
propagate on stacked devs.
Add the basic algorithms for get/set attr ops. Use the same recusive algo
to walk lower devs we've used for STP updates, for example. For get,
compare attr value for each lower dev and only return success if attr
values match across all lower devs. For sets, set the same attr value for
all lower devs. We'll use a two-phase prepare-commit transaction model for
sets. In the first phase, the driver(s) are asked if attr set is OK. If
all OK, the commit attr set in second phase. A driver would NACK the
prepare phase if it can't set the attr due to lack of resources or support,
within it's control. RTNL lock must be held across both phases because
we'll recurse all lower devs first in prepare phase, and then recurse all
lower devs again in commit phase. If any lower dev fails the prepare
phase, we need to abort the transaction for all lower devs.
If lower dev recusion isn't desired, allow a flag SWITCHDEV_F_NO_RECURSE to
indicate get/set only work on port (lowest) device.
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-10 19:47:48 +03:00
EXPORT_SYMBOL_GPL ( switchdev_port_attr_set ) ;
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static size_t switchdev_obj_size ( const struct switchdev_obj * obj )
{
switch ( obj - > id ) {
case SWITCHDEV_OBJ_ID_PORT_VLAN :
return sizeof ( struct switchdev_obj_port_vlan ) ;
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case SWITCHDEV_OBJ_ID_PORT_MDB :
return sizeof ( struct switchdev_obj_port_mdb ) ;
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case SWITCHDEV_OBJ_ID_HOST_MDB :
return sizeof ( struct switchdev_obj_port_mdb ) ;
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default :
BUG ( ) ;
}
return 0 ;
}
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static int switchdev_port_obj_notify ( enum switchdev_notifier_type nt ,
struct net_device * dev ,
const struct switchdev_obj * obj ,
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struct netlink_ext_ack * extack )
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{
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int rc ;
int err ;
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struct switchdev_notifier_port_obj_info obj_info = {
. obj = obj ,
. handled = false ,
} ;
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2018-12-12 20:02:54 +03:00
rc = call_switchdev_blocking_notifiers ( nt , dev , & obj_info . info , extack ) ;
2018-11-23 02:32:57 +03:00
err = notifier_to_errno ( rc ) ;
if ( err ) {
WARN_ON ( ! obj_info . handled ) ;
return err ;
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}
2018-11-23 02:32:57 +03:00
if ( ! obj_info . handled )
return - EOPNOTSUPP ;
return 0 ;
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}
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static void switchdev_port_obj_add_deferred ( struct net_device * dev ,
const void * data )
{
const struct switchdev_obj * obj = data ;
int err ;
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ASSERT_RTNL ( ) ;
err = switchdev_port_obj_notify ( SWITCHDEV_PORT_OBJ_ADD ,
dev , obj , NULL ) ;
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if ( err & & err ! = - EOPNOTSUPP )
netdev_err ( dev , " failed (err=%d) to add object (id=%d) \n " ,
err , obj - > id ) ;
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if ( obj - > complete )
obj - > complete ( dev , err , obj - > complete_priv ) ;
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}
static int switchdev_port_obj_add_defer ( struct net_device * dev ,
const struct switchdev_obj * obj )
{
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return switchdev_deferred_enqueue ( dev , obj , switchdev_obj_size ( obj ) ,
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switchdev_port_obj_add_deferred ) ;
}
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/**
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* switchdev_port_obj_add - Add port object
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*
* @ dev : port device
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* @ obj : object to add
2020-07-13 02:15:13 +03:00
* @ extack : netlink extended ack
2015-10-14 20:40:52 +03:00
*
* rtnl_lock must be held and must not be in atomic section ,
* in case SWITCHDEV_F_DEFER flag is not set .
2015-05-10 19:47:52 +03:00
*/
2015-10-14 20:40:52 +03:00
int switchdev_port_obj_add ( struct net_device * dev ,
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const struct switchdev_obj * obj ,
struct netlink_ext_ack * extack )
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{
if ( obj - > flags & SWITCHDEV_F_DEFER )
return switchdev_port_obj_add_defer ( dev , obj ) ;
ASSERT_RTNL ( ) ;
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return switchdev_port_obj_notify ( SWITCHDEV_PORT_OBJ_ADD ,
dev , obj , extack ) ;
2015-10-14 20:40:52 +03:00
}
EXPORT_SYMBOL_GPL ( switchdev_port_obj_add ) ;
static int switchdev_port_obj_del_now ( struct net_device * dev ,
const struct switchdev_obj * obj )
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{
2018-11-23 02:32:57 +03:00
return switchdev_port_obj_notify ( SWITCHDEV_PORT_OBJ_DEL ,
net: switchdev: remove the transaction structure from port object notifiers
Since the introduction of the switchdev API, port objects were
transmitted to drivers for offloading using a two-step transactional
model, with a prepare phase that was supposed to catch all errors, and a
commit phase that was supposed to never fail.
Some classes of failures can never be avoided, like hardware access, or
memory allocation. In the latter case, merely attempting to move the
memory allocation to the preparation phase makes it impossible to avoid
memory leaks, since commit 91cf8eceffc1 ("switchdev: Remove unused
transaction item queue") which has removed the unused mechanism of
passing on the allocated memory between one phase and another.
It is time we admit that separating the preparation from the commit
phase is something that is best left for the driver to decide, and not
something that should be baked into the API, especially since there are
no switchdev callers that depend on this.
This patch removes the struct switchdev_trans member from switchdev port
object notifier structures, and converts drivers to not look at this
member.
Where driver conversion is trivial (like in the case of the Marvell
Prestera driver, NXP DPAA2 switch, TI CPSW, and Rocker drivers), it is
done in this patch.
Where driver conversion needs more attention (DSA, Mellanox Spectrum),
the conversion is left for subsequent patches and here we only fake the
prepare/commit phases at a lower level, just not in the switchdev
notifier itself.
Where the code has a natural structure that is best left alone as a
preparation and a commit phase (as in the case of the Ocelot switch),
that structure is left in place, just made to not depend upon the
switchdev transactional model.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-09 03:01:48 +03:00
dev , obj , NULL ) ;
2015-05-10 19:47:52 +03:00
}
2015-10-14 20:40:52 +03:00
static void switchdev_port_obj_del_deferred ( struct net_device * dev ,
const void * data )
{
const struct switchdev_obj * obj = data ;
int err ;
err = switchdev_port_obj_del_now ( dev , obj ) ;
if ( err & & err ! = - EOPNOTSUPP )
netdev_err ( dev , " failed (err=%d) to del object (id=%d) \n " ,
err , obj - > id ) ;
2016-04-21 13:52:43 +03:00
if ( obj - > complete )
obj - > complete ( dev , err , obj - > complete_priv ) ;
2015-10-14 20:40:52 +03:00
}
static int switchdev_port_obj_del_defer ( struct net_device * dev ,
const struct switchdev_obj * obj )
{
2015-10-29 09:17:31 +03:00
return switchdev_deferred_enqueue ( dev , obj , switchdev_obj_size ( obj ) ,
2015-10-14 20:40:52 +03:00
switchdev_port_obj_del_deferred ) ;
}
/**
* switchdev_port_obj_del - Delete port object
*
* @ dev : port device
* @ obj : object to delete
*
* rtnl_lock must be held and must not be in atomic section ,
* in case SWITCHDEV_F_DEFER flag is not set .
*/
int switchdev_port_obj_del ( struct net_device * dev ,
const struct switchdev_obj * obj )
{
if ( obj - > flags & SWITCHDEV_F_DEFER )
return switchdev_port_obj_del_defer ( dev , obj ) ;
ASSERT_RTNL ( ) ;
return switchdev_port_obj_del_now ( dev , obj ) ;
}
2015-05-10 19:47:52 +03:00
EXPORT_SYMBOL_GPL ( switchdev_port_obj_del ) ;
2017-06-08 09:44:13 +03:00
static ATOMIC_NOTIFIER_HEAD ( switchdev_notif_chain ) ;
2018-11-23 02:28:25 +03:00
static BLOCKING_NOTIFIER_HEAD ( switchdev_blocking_notif_chain ) ;
2015-01-16 01:49:36 +03:00
/**
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* register_switchdev_notifier - Register notifier
2015-01-16 01:49:36 +03:00
* @ nb : notifier_block
*
2017-06-08 09:44:13 +03:00
* Register switch device notifier .
2015-01-16 01:49:36 +03:00
*/
2015-05-10 19:47:46 +03:00
int register_switchdev_notifier ( struct notifier_block * nb )
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{
2017-06-08 09:44:13 +03:00
return atomic_notifier_chain_register ( & switchdev_notif_chain , nb ) ;
2015-01-16 01:49:36 +03:00
}
2015-05-10 19:47:46 +03:00
EXPORT_SYMBOL_GPL ( register_switchdev_notifier ) ;
2015-01-16 01:49:36 +03:00
/**
2015-05-10 19:47:46 +03:00
* unregister_switchdev_notifier - Unregister notifier
2015-01-16 01:49:36 +03:00
* @ nb : notifier_block
*
* Unregister switch device notifier .
*/
2015-05-10 19:47:46 +03:00
int unregister_switchdev_notifier ( struct notifier_block * nb )
2015-01-16 01:49:36 +03:00
{
2017-06-08 09:44:13 +03:00
return atomic_notifier_chain_unregister ( & switchdev_notif_chain , nb ) ;
2015-01-16 01:49:36 +03:00
}
2015-05-10 19:47:46 +03:00
EXPORT_SYMBOL_GPL ( unregister_switchdev_notifier ) ;
2015-01-16 01:49:36 +03:00
/**
2015-05-10 19:47:46 +03:00
* call_switchdev_notifiers - Call notifiers
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* @ val : value passed unmodified to notifier function
* @ dev : port device
* @ info : notifier information data
2020-09-22 16:32:19 +03:00
* @ extack : netlink extended ack
2017-06-08 09:44:13 +03:00
* Call all network notifier blocks .
2015-01-16 01:49:36 +03:00
*/
2015-05-10 19:47:46 +03:00
int call_switchdev_notifiers ( unsigned long val , struct net_device * dev ,
2019-01-17 02:06:56 +03:00
struct switchdev_notifier_info * info ,
struct netlink_ext_ack * extack )
2015-01-16 01:49:36 +03:00
{
info - > dev = dev ;
2019-01-17 02:06:56 +03:00
info - > extack = extack ;
2017-06-08 09:44:13 +03:00
return atomic_notifier_call_chain ( & switchdev_notif_chain , val , info ) ;
2015-01-16 01:49:36 +03:00
}
2015-05-10 19:47:46 +03:00
EXPORT_SYMBOL_GPL ( call_switchdev_notifiers ) ;
2015-01-30 09:40:13 +03:00
2018-11-23 02:28:25 +03:00
int register_switchdev_blocking_notifier ( struct notifier_block * nb )
{
struct blocking_notifier_head * chain = & switchdev_blocking_notif_chain ;
return blocking_notifier_chain_register ( chain , nb ) ;
}
EXPORT_SYMBOL_GPL ( register_switchdev_blocking_notifier ) ;
int unregister_switchdev_blocking_notifier ( struct notifier_block * nb )
{
struct blocking_notifier_head * chain = & switchdev_blocking_notif_chain ;
return blocking_notifier_chain_unregister ( chain , nb ) ;
}
EXPORT_SYMBOL_GPL ( unregister_switchdev_blocking_notifier ) ;
int call_switchdev_blocking_notifiers ( unsigned long val , struct net_device * dev ,
2018-12-12 20:02:54 +03:00
struct switchdev_notifier_info * info ,
struct netlink_ext_ack * extack )
2018-11-23 02:28:25 +03:00
{
info - > dev = dev ;
2018-12-12 20:02:54 +03:00
info - > extack = extack ;
2018-11-23 02:28:25 +03:00
return blocking_notifier_call_chain ( & switchdev_blocking_notif_chain ,
val , info ) ;
}
EXPORT_SYMBOL_GPL ( call_switchdev_blocking_notifiers ) ;
2018-11-23 02:29:44 +03:00
static int __switchdev_handle_port_obj_add ( struct net_device * dev ,
struct switchdev_notifier_port_obj_info * port_obj_info ,
bool ( * check_cb ) ( const struct net_device * dev ) ,
int ( * add_cb ) ( struct net_device * dev ,
const struct switchdev_obj * obj ,
2018-12-12 20:02:56 +03:00
struct netlink_ext_ack * extack ) )
2018-11-23 02:29:44 +03:00
{
2018-12-12 20:02:56 +03:00
struct netlink_ext_ack * extack ;
2018-11-23 02:29:44 +03:00
struct net_device * lower_dev ;
struct list_head * iter ;
int err = - EOPNOTSUPP ;
2018-12-12 20:02:56 +03:00
extack = switchdev_notifier_info_to_extack ( & port_obj_info - > info ) ;
2018-11-23 02:29:44 +03:00
if ( check_cb ( dev ) ) {
2021-01-29 04:09:31 +03:00
err = add_cb ( dev , port_obj_info - > obj , extack ) ;
net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP
It's not true that switchdev_port_obj_notify() only inspects the
->handled field of "struct switchdev_notifier_port_obj_info" if
call_switchdev_blocking_notifiers() returns 0 - there's a WARN_ON()
triggering for a non-zero return combined with ->handled not being
true. But the real problem here is that -EOPNOTSUPP is not being
properly handled.
The wrapper functions switchdev_handle_port_obj_add() et al change a
return value of -EOPNOTSUPP to 0, and the treatment of ->handled in
switchdev_port_obj_notify() seems to be designed to change that back
to -EOPNOTSUPP in case nobody actually acted on the notifier (i.e.,
everybody returned -EOPNOTSUPP).
Currently, as soon as some device down the stack passes the check_cb()
check, ->handled gets set to true, which means that
switchdev_port_obj_notify() cannot actually ever return -EOPNOTSUPP.
This, for example, means that the detection of hardware offload
support in the MRP code is broken: switchdev_port_obj_add() used by
br_mrp_switchdev_send_ring_test() always returns 0, so since the MRP
code thinks the generation of MRP test frames has been offloaded, no
such frames are actually put on the wire. Similarly,
br_mrp_switchdev_set_ring_role() also always returns 0, causing
mrp->ring_role_offloaded to be set to 1.
To fix this, continue to set ->handled true if any callback returns
success or any error distinct from -EOPNOTSUPP. But if all the
callbacks return -EOPNOTSUPP, make sure that ->handled stays false, so
the logic in switchdev_port_obj_notify() can propagate that
information.
Fixes: 9a9f26e8f7ea ("bridge: mrp: Connect MRP API with the switchdev API")
Fixes: f30f0601eb93 ("switchdev: Add helpers to aid traversal through lower devices")
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Link: https://lore.kernel.org/r/20210125124116.102928-1-rasmus.villemoes@prevas.dk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-25 15:41:16 +03:00
if ( err ! = - EOPNOTSUPP )
port_obj_info - > handled = true ;
return err ;
2018-11-23 02:29:44 +03:00
}
/* Switch ports might be stacked under e.g. a LAG. Ignore the
* unsupported devices , another driver might be able to handle them . But
* propagate to the callers any hard errors .
*
* If the driver does its own bookkeeping of stacked ports , it ' s not
* necessary to go through this helper .
*/
netdev_for_each_lower_dev ( dev , lower_dev , iter ) {
2020-02-26 20:14:21 +03:00
if ( netif_is_bridge_master ( lower_dev ) )
continue ;
2018-11-23 02:29:44 +03:00
err = __switchdev_handle_port_obj_add ( lower_dev , port_obj_info ,
check_cb , add_cb ) ;
if ( err & & err ! = - EOPNOTSUPP )
return err ;
}
return err ;
}
int switchdev_handle_port_obj_add ( struct net_device * dev ,
struct switchdev_notifier_port_obj_info * port_obj_info ,
bool ( * check_cb ) ( const struct net_device * dev ) ,
int ( * add_cb ) ( struct net_device * dev ,
const struct switchdev_obj * obj ,
2018-12-12 20:02:56 +03:00
struct netlink_ext_ack * extack ) )
2018-11-23 02:29:44 +03:00
{
int err ;
err = __switchdev_handle_port_obj_add ( dev , port_obj_info , check_cb ,
add_cb ) ;
if ( err = = - EOPNOTSUPP )
err = 0 ;
return err ;
}
EXPORT_SYMBOL_GPL ( switchdev_handle_port_obj_add ) ;
static int __switchdev_handle_port_obj_del ( struct net_device * dev ,
struct switchdev_notifier_port_obj_info * port_obj_info ,
bool ( * check_cb ) ( const struct net_device * dev ) ,
int ( * del_cb ) ( struct net_device * dev ,
const struct switchdev_obj * obj ) )
{
struct net_device * lower_dev ;
struct list_head * iter ;
int err = - EOPNOTSUPP ;
if ( check_cb ( dev ) ) {
net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP
It's not true that switchdev_port_obj_notify() only inspects the
->handled field of "struct switchdev_notifier_port_obj_info" if
call_switchdev_blocking_notifiers() returns 0 - there's a WARN_ON()
triggering for a non-zero return combined with ->handled not being
true. But the real problem here is that -EOPNOTSUPP is not being
properly handled.
The wrapper functions switchdev_handle_port_obj_add() et al change a
return value of -EOPNOTSUPP to 0, and the treatment of ->handled in
switchdev_port_obj_notify() seems to be designed to change that back
to -EOPNOTSUPP in case nobody actually acted on the notifier (i.e.,
everybody returned -EOPNOTSUPP).
Currently, as soon as some device down the stack passes the check_cb()
check, ->handled gets set to true, which means that
switchdev_port_obj_notify() cannot actually ever return -EOPNOTSUPP.
This, for example, means that the detection of hardware offload
support in the MRP code is broken: switchdev_port_obj_add() used by
br_mrp_switchdev_send_ring_test() always returns 0, so since the MRP
code thinks the generation of MRP test frames has been offloaded, no
such frames are actually put on the wire. Similarly,
br_mrp_switchdev_set_ring_role() also always returns 0, causing
mrp->ring_role_offloaded to be set to 1.
To fix this, continue to set ->handled true if any callback returns
success or any error distinct from -EOPNOTSUPP. But if all the
callbacks return -EOPNOTSUPP, make sure that ->handled stays false, so
the logic in switchdev_port_obj_notify() can propagate that
information.
Fixes: 9a9f26e8f7ea ("bridge: mrp: Connect MRP API with the switchdev API")
Fixes: f30f0601eb93 ("switchdev: Add helpers to aid traversal through lower devices")
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Link: https://lore.kernel.org/r/20210125124116.102928-1-rasmus.villemoes@prevas.dk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-25 15:41:16 +03:00
err = del_cb ( dev , port_obj_info - > obj ) ;
if ( err ! = - EOPNOTSUPP )
port_obj_info - > handled = true ;
return err ;
2018-11-23 02:29:44 +03:00
}
/* Switch ports might be stacked under e.g. a LAG. Ignore the
* unsupported devices , another driver might be able to handle them . But
* propagate to the callers any hard errors .
*
* If the driver does its own bookkeeping of stacked ports , it ' s not
* necessary to go through this helper .
*/
netdev_for_each_lower_dev ( dev , lower_dev , iter ) {
2020-02-26 20:14:21 +03:00
if ( netif_is_bridge_master ( lower_dev ) )
continue ;
2018-11-23 02:29:44 +03:00
err = __switchdev_handle_port_obj_del ( lower_dev , port_obj_info ,
check_cb , del_cb ) ;
if ( err & & err ! = - EOPNOTSUPP )
return err ;
}
return err ;
}
int switchdev_handle_port_obj_del ( struct net_device * dev ,
struct switchdev_notifier_port_obj_info * port_obj_info ,
bool ( * check_cb ) ( const struct net_device * dev ) ,
int ( * del_cb ) ( struct net_device * dev ,
const struct switchdev_obj * obj ) )
{
int err ;
err = __switchdev_handle_port_obj_del ( dev , port_obj_info , check_cb ,
del_cb ) ;
if ( err = = - EOPNOTSUPP )
err = 0 ;
return err ;
}
EXPORT_SYMBOL_GPL ( switchdev_handle_port_obj_del ) ;
2019-02-27 22:44:25 +03:00
static int __switchdev_handle_port_attr_set ( struct net_device * dev ,
struct switchdev_notifier_port_attr_info * port_attr_info ,
bool ( * check_cb ) ( const struct net_device * dev ) ,
int ( * set_cb ) ( struct net_device * dev ,
2021-02-12 18:15:51 +03:00
const struct switchdev_attr * attr ,
struct netlink_ext_ack * extack ) )
2019-02-27 22:44:25 +03:00
{
2021-02-12 18:15:51 +03:00
struct netlink_ext_ack * extack ;
2019-02-27 22:44:25 +03:00
struct net_device * lower_dev ;
struct list_head * iter ;
int err = - EOPNOTSUPP ;
2021-02-12 18:15:51 +03:00
extack = switchdev_notifier_info_to_extack ( & port_attr_info - > info ) ;
2019-02-27 22:44:25 +03:00
if ( check_cb ( dev ) ) {
2021-02-12 18:15:51 +03:00
err = set_cb ( dev , port_attr_info - > attr , extack ) ;
net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP
It's not true that switchdev_port_obj_notify() only inspects the
->handled field of "struct switchdev_notifier_port_obj_info" if
call_switchdev_blocking_notifiers() returns 0 - there's a WARN_ON()
triggering for a non-zero return combined with ->handled not being
true. But the real problem here is that -EOPNOTSUPP is not being
properly handled.
The wrapper functions switchdev_handle_port_obj_add() et al change a
return value of -EOPNOTSUPP to 0, and the treatment of ->handled in
switchdev_port_obj_notify() seems to be designed to change that back
to -EOPNOTSUPP in case nobody actually acted on the notifier (i.e.,
everybody returned -EOPNOTSUPP).
Currently, as soon as some device down the stack passes the check_cb()
check, ->handled gets set to true, which means that
switchdev_port_obj_notify() cannot actually ever return -EOPNOTSUPP.
This, for example, means that the detection of hardware offload
support in the MRP code is broken: switchdev_port_obj_add() used by
br_mrp_switchdev_send_ring_test() always returns 0, so since the MRP
code thinks the generation of MRP test frames has been offloaded, no
such frames are actually put on the wire. Similarly,
br_mrp_switchdev_set_ring_role() also always returns 0, causing
mrp->ring_role_offloaded to be set to 1.
To fix this, continue to set ->handled true if any callback returns
success or any error distinct from -EOPNOTSUPP. But if all the
callbacks return -EOPNOTSUPP, make sure that ->handled stays false, so
the logic in switchdev_port_obj_notify() can propagate that
information.
Fixes: 9a9f26e8f7ea ("bridge: mrp: Connect MRP API with the switchdev API")
Fixes: f30f0601eb93 ("switchdev: Add helpers to aid traversal through lower devices")
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Link: https://lore.kernel.org/r/20210125124116.102928-1-rasmus.villemoes@prevas.dk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-25 15:41:16 +03:00
if ( err ! = - EOPNOTSUPP )
port_attr_info - > handled = true ;
return err ;
2019-02-27 22:44:25 +03:00
}
/* Switch ports might be stacked under e.g. a LAG. Ignore the
* unsupported devices , another driver might be able to handle them . But
* propagate to the callers any hard errors .
*
* If the driver does its own bookkeeping of stacked ports , it ' s not
* necessary to go through this helper .
*/
netdev_for_each_lower_dev ( dev , lower_dev , iter ) {
2020-02-26 20:14:21 +03:00
if ( netif_is_bridge_master ( lower_dev ) )
continue ;
2019-02-27 22:44:25 +03:00
err = __switchdev_handle_port_attr_set ( lower_dev , port_attr_info ,
check_cb , set_cb ) ;
if ( err & & err ! = - EOPNOTSUPP )
return err ;
}
return err ;
}
int switchdev_handle_port_attr_set ( struct net_device * dev ,
struct switchdev_notifier_port_attr_info * port_attr_info ,
bool ( * check_cb ) ( const struct net_device * dev ) ,
int ( * set_cb ) ( struct net_device * dev ,
2021-02-12 18:15:51 +03:00
const struct switchdev_attr * attr ,
struct netlink_ext_ack * extack ) )
2019-02-27 22:44:25 +03:00
{
int err ;
err = __switchdev_handle_port_attr_set ( dev , port_attr_info , check_cb ,
set_cb ) ;
if ( err = = - EOPNOTSUPP )
err = 0 ;
return err ;
}
EXPORT_SYMBOL_GPL ( switchdev_handle_port_attr_set ) ;
