netdev - [RFC PATCH 01/17] net: sched: cleanup qdisc_run and __qdisc

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Message-ID: <20171113200758.6245.92121.stgit@john-Precision-Tower-5810>
Date:   Mon, 13 Nov 2017 12:07:58 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     willemdebruijn.kernel@...il.com, daniel@...earbox.net,
        eric.dumazet@...il.com
Cc:     make0818@...il.com, netdev@...r.kernel.org, jiri@...nulli.us,
        xiyou.wangcong@...il.com
Subject: [RFC PATCH 01/17] net: sched: cleanup qdisc_run and __qdisc_run
 semantics

Currently __qdisc_run calls qdisc_run_end() but does not call
qdisc_run_begin(). This makes it hard to track pairs of
qdisc_run_{begin,end} across function calls.

To simplify reading these code paths this patch moves begin/end calls
into qdisc_run().

Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: John Fastabend <john.fastabend@...il.com>
---
 0 files changed

diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index d1f413f..4eea719 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -113,8 +113,10 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 
 static inline void qdisc_run(struct Qdisc *q)
 {
-	if (qdisc_run_begin(q))
+	if (qdisc_run_begin(q)) {
 		__qdisc_run(q);
+		qdisc_run_end(q);
+	}
 }
 
 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
diff --git a/net/core/dev.c b/net/core/dev.c
index 30b5fe3..9f5fa78 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3209,9 +3209,9 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
 				contended = false;
 			}
 			__qdisc_run(q);
-		} else
-			qdisc_run_end(q);
+		}
 
+		qdisc_run_end(q);
 		rc = NET_XMIT_SUCCESS;
 	} else {
 		rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
@@ -3221,6 +3221,7 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
 				contended = false;
 			}
 			__qdisc_run(q);
+			qdisc_run_end(q);
 		}
 	}
 	spin_unlock(root_lock);
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 3839cbb..f6803e1 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -266,8 +266,6 @@ void __qdisc_run(struct Qdisc *q)
 			break;
 		}
 	}
-
-	qdisc_run_end(q);
 }
 
 unsigned long dev_trans_start(struct net_device *dev)