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Date: Wed, 11 Dec 2013 15:17:11 +0800
From: Yang Yingliang <yangyingliang@...wei.com>
To: David Miller <davem@...emloft.net>
CC: <netdev@...r.kernel.org>
Subject: [PATCH net-next] net_sched: expand control flow of macro SKIP_NONLOCAL
From: Yang Yingliang <yangyingliang@...wei.com>
SKIP_NONLOCAL hides the control flow. The control flow should be
inlined and expanded explicitly in code so that someone who reads
it can tell the control flow can be changed by the statement.
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
net/sched/em_meta.c | 157 ++++++++++++++++++++++++++++++++++++++++------------
1 file changed, 122 insertions(+), 35 deletions(-)
diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
index e5cef956..382519a 100644
--- a/net/sched/em_meta.c
+++ b/net/sched/em_meta.c
@@ -271,40 +271,52 @@ META_COLLECTOR(int_rtiif)
* Socket Attributes
**************************************************************************/
-#define SKIP_NONLOCAL(skb) \
- if (unlikely(skb->sk == NULL)) { \
- *err = -1; \
- return; \
- }
+#define skip_nonlocal(skb) \
+ (unlikely(skb->sk == NULL))
META_COLLECTOR(int_sk_family)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_family;
}
META_COLLECTOR(int_sk_state)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_state;
}
META_COLLECTOR(int_sk_reuse)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_reuse;
}
META_COLLECTOR(int_sk_bound_if)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
/* No error if bound_dev_if is 0, legal userspace check */
dst->value = skb->sk->sk_bound_dev_if;
}
META_COLLECTOR(var_sk_bound_if)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
if (skb->sk->sk_bound_dev_if == 0) {
dst->value = (unsigned long) "any";
@@ -322,151 +334,226 @@ META_COLLECTOR(var_sk_bound_if)
META_COLLECTOR(int_sk_refcnt)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = atomic_read(&skb->sk->sk_refcnt);
}
META_COLLECTOR(int_sk_rcvbuf)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_rcvbuf;
}
META_COLLECTOR(int_sk_shutdown)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_shutdown;
}
META_COLLECTOR(int_sk_proto)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_protocol;
}
META_COLLECTOR(int_sk_type)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_type;
}
META_COLLECTOR(int_sk_rmem_alloc)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = sk_rmem_alloc_get(skb->sk);
}
META_COLLECTOR(int_sk_wmem_alloc)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = sk_wmem_alloc_get(skb->sk);
}
META_COLLECTOR(int_sk_omem_alloc)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = atomic_read(&skb->sk->sk_omem_alloc);
}
META_COLLECTOR(int_sk_rcv_qlen)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_receive_queue.qlen;
}
META_COLLECTOR(int_sk_snd_qlen)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_write_queue.qlen;
}
META_COLLECTOR(int_sk_wmem_queued)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_wmem_queued;
}
META_COLLECTOR(int_sk_fwd_alloc)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_forward_alloc;
}
META_COLLECTOR(int_sk_sndbuf)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_sndbuf;
}
META_COLLECTOR(int_sk_alloc)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = (__force int) skb->sk->sk_allocation;
}
META_COLLECTOR(int_sk_hash)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_hash;
}
META_COLLECTOR(int_sk_lingertime)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_lingertime / HZ;
}
META_COLLECTOR(int_sk_err_qlen)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_error_queue.qlen;
}
META_COLLECTOR(int_sk_ack_bl)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_ack_backlog;
}
META_COLLECTOR(int_sk_max_ack_bl)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_max_ack_backlog;
}
META_COLLECTOR(int_sk_prio)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_priority;
}
META_COLLECTOR(int_sk_rcvlowat)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_rcvlowat;
}
META_COLLECTOR(int_sk_rcvtimeo)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_rcvtimeo / HZ;
}
META_COLLECTOR(int_sk_sndtimeo)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_sndtimeo / HZ;
}
META_COLLECTOR(int_sk_sendmsg_off)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_frag.offset;
}
META_COLLECTOR(int_sk_write_pend)
{
- SKIP_NONLOCAL(skb);
+ if (skip_nonlocal(skb)) {
+ *err = -1;
+ return;
+ }
dst->value = skb->sk->sk_write_pending;
}
-- 1.8.0
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