diff options
| author |   David S. Miller <davem@davemloft.net> | 2022-06-24 11:34:38 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-06-24 11:34:38 +0100 |
| commit | 23f94f1bc144469efc45370a8be6a73965cf4b68 (patch) | |
| tree | 5c00956ca95472c1a3196f5b74f4396e5b44abb2 /include/linux | |
| parent | Merge branch 'dsa-microchip-common-spi-probe' (diff) | |
| parent | ip6mr: convert mrt_lock to a spinlock (diff) | |
Merge branch 'ipmr-remove-rwlocks'
Eric Dumazet says:
====================
ipmr: get rid of rwlocks
We need to get rid of rwlocks in networking stacks,
if read_lock() is (ab)used from softirq context.
As discussed recently [1], rwlock are unfair by design in this case,
and writers can starve and trigger soft lockups.
This series convert ipmr code (both IPv4 and IPv6 families)
to RCU and spinlocks.
[1] https://lkml.org/lkml/2022/6/17/272
v2: fixed two typos, and resent because patch 19/19
did not make it to patchwork.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mroute_base.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/include/linux/mroute_base.h b/include/linux/mroute_base.h index e05ee9f001ff..9dd4bf157255 100644 --- a/include/linux/mroute_base.h +++ b/include/linux/mroute_base.h @@ -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) @@ -305,7 +308,7 @@ int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family, struct netlink_ext_ack *extack), struct mr_table *(*mr_iter)(struct net *net, struct mr_table *mrt), - rwlock_t *mrt_lock, struct netlink_ext_ack *extack); + struct netlink_ext_ack *extack); #else static inline void vif_device_init(struct vif_device *v, struct net_device *dev, @@ -360,7 +363,7 @@ static inline int mr_dump(struct net *net, struct notifier_block *nb, struct netlink_ext_ack *extack), struct mr_table *(*mr_iter)(struct net *net, struct mr_table *mrt), - rwlock_t *mrt_lock, struct netlink_ext_ack *extack) + struct netlink_ext_ack *extack) { return -EINVAL; } |