net: sched: atomically check-allocate action
authorVlad Buslov <vladbu@mellanox.com>
Thu, 5 Jul 2018 14:24:32 +0000 (17:24 +0300)
committerDavid S. Miller <davem@davemloft.net>
Sun, 8 Jul 2018 03:42:29 +0000 (12:42 +0900)
commit0190c1d452a91c38a3462abdd81752be1b9006a8
tree861605e9fbe0db5ba1ef8a518cc0bca96d04f4fb
parentcae422f379f37fe9105d2a113259788f989e7df5
net: sched: atomically check-allocate action

Implement function that atomically checks if action exists and either takes
reference to it, or allocates idr slot for action index to prevent
concurrent allocations of actions with same index. Use EBUSY error pointer
to indicate that idr slot is reserved.

Implement cleanup helper function that removes temporary error pointer from
idr. (in case of error between idr allocation and insertion of newly
created action to specified index)

Refactor all action init functions to insert new action to idr using this
API.

Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
18 files changed:
include/net/act_api.h
net/sched/act_api.c
net/sched/act_bpf.c
net/sched/act_connmark.c
net/sched/act_csum.c
net/sched/act_gact.c
net/sched/act_ife.c
net/sched/act_ipt.c
net/sched/act_mirred.c
net/sched/act_nat.c
net/sched/act_pedit.c
net/sched/act_police.c
net/sched/act_sample.c
net/sched/act_simple.c
net/sched/act_skbedit.c
net/sched/act_skbmod.c
net/sched/act_tunnel_key.c
net/sched/act_vlan.c