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ipmr: add rcu protection over (struct vif_device)->dev

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We will soon use RCU instead of rwlock in ipmr & ip6mr

This preliminary patch adds proper rcu verbs to read/write
(struct vif_device)->dev

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2022-06-23 04:34:32 +00:00
committed by David S. Miller
parent 0a24c43f54
commit ebc3197963
4 changed files with 111 additions and 77 deletions
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11
include/linux/mroute_base.h
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@@ -26,7 +26,7 @@
* @remote: Remote address for tunnels
*/
struct vif_device {
struct net_device *dev;
struct net_device __rcu *dev;
netdevice_tracker dev_tracker;
unsigned long bytes_in, bytes_out;
unsigned long pkt_in, pkt_out;
@@ -52,6 +52,7 @@ static inline int mr_call_vif_notifier(struct notifier_block *nb,
unsigned short family,
enum fib_event_type event_type,
struct vif_device *vif,
struct net_device *vif_dev,
unsigned short vif_index, u32 tb_id,
struct netlink_ext_ack *extack)
{
@@ -60,7 +61,7 @@ static inline int mr_call_vif_notifier(struct notifier_block *nb,
.family = family,
.extack = extack,
},
.dev = vif->dev,
.dev = vif_dev,
.vif_index = vif_index,
.vif_flags = vif->flags,
.tb_id = tb_id,
@@ -73,6 +74,7 @@ static inline int mr_call_vif_notifiers(struct net *net,
unsigned short family,
enum fib_event_type event_type,
struct vif_device *vif,
struct net_device *vif_dev,
unsigned short vif_index, u32 tb_id,
unsigned int *ipmr_seq)
{
@@ -80,7 +82,7 @@ static inline int mr_call_vif_notifiers(struct net *net,
.info = {
.family = family,
},
.dev = vif->dev,
.dev = vif_dev,
.vif_index = vif_index,
.vif_flags = vif->flags,
.tb_id = tb_id,
@@ -98,7 +100,8 @@ static inline int mr_call_vif_notifiers(struct net *net,
#define MAXVIFS 32
#endif
#define VIF_EXISTS(_mrt, _idx) (!!((_mrt)->vif_table[_idx].dev))
/* Note: This helper is deprecated. */
#define VIF_EXISTS(_mrt, _idx) (!!rcu_access_pointer((_mrt)->vif_table[_idx].dev))
/* mfc_flags:
* MFC_STATIC - the entry was added statically (not by a routing daemon)