diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-09-13 11:25:35 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-09-13 11:25:35 +0200 |
| commit | d2bb1d42b95fa88f092623bbb8ed533f316b6a3c (patch) | |
| tree | fb796db809a266906fa358f24f1c07ced4df33f0 /include/net/cls_cgroup.h | |
| parent | Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/... (diff) | |
| parent | Linux 4.3-rc1 (diff) | |
| download | linux-d2bb1d42b95fa88f092623bbb8ed533f316b6a3c.tar.xz linux-d2bb1d42b95fa88f092623bbb8ed533f316b6a3c.zip | |
Merge tag 'v4.3-rc1' into perf/core, to refresh the tree
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/net/cls_cgroup.h')
| -rw-r--r-- | include/net/cls_cgroup.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/net/cls_cgroup.h b/include/net/cls_cgroup.h index c15d39456e14..ccd6d8bffa4d 100644 --- a/include/net/cls_cgroup.h +++ b/include/net/cls_cgroup.h @@ -49,9 +49,38 @@ static inline void sock_update_classid(struct sock *sk) if (classid != sk->sk_classid) sk->sk_classid = classid; } + +static inline u32 task_get_classid(const struct sk_buff *skb) +{ + u32 classid = task_cls_state(current)->classid; + + /* Due to the nature of the classifier it is required to ignore all + * packets originating from softirq context as accessing `current' + * would lead to false results. + * + * This test assumes that all callers of dev_queue_xmit() explicitly + * disable bh. Knowing this, it is possible to detect softirq based + * calls by looking at the number of nested bh disable calls because + * softirqs always disables bh. + */ + if (in_serving_softirq()) { + /* If there is an sk_classid we'll use that. */ + if (!skb->sk) + return 0; + + classid = skb->sk->sk_classid; + } + + return classid; +} #else /* !CONFIG_CGROUP_NET_CLASSID */ static inline void sock_update_classid(struct sock *sk) { } + +static inline u32 task_get_classid(const struct sk_buff *skb) +{ + return 0; +} #endif /* CONFIG_CGROUP_NET_CLASSID */ #endif /* _NET_CLS_CGROUP_H */ |