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Date:   Sat, 11 May 2019 23:14:45 +0300
From:   Vladimir Oltean <>
Cc:, Vladimir Oltean <>
Subject: [PATCH net 1/3] net: dsa: Initialize DSA_SKB_CB(skb)->deferred_xmit variable

The sk_buff control block can have any contents on xmit put there by the
stack, so initialization is mandatory, since we are checking its value
after the actual DSA xmit (the tagger may have changed it).

The DSA_SKB_ZERO() macro could have been used for this purpose, but:
- Zeroizing a 48-byte memory region in the hotpath is best avoided.
- It would have triggered a warning with newer compilers since
  __dsa_skb_cb contains a structure within a structure, and the {0}
  initializer was incorrect for that purpose.

So simply remove the DSA_SKB_ZERO() macro and initialize the
deferred_xmit variable by hand (which should be done for all further
dsa_skb_cb variables which need initialization - currently none - to
avoid the performance penalty).

Fixes: 97a69a0dea9a ("net: dsa: Add support for deferred xmit")
Signed-off-by: Vladimir Oltean <>
 include/net/dsa.h | 3 ---
 net/dsa/slave.c   | 2 ++
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 6aaaadd6a413..35ca1f2c6e28 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -102,9 +102,6 @@ struct __dsa_skb_cb {
 #define DSA_SKB_CB_COPY(nskb, skb)		\
 	{ *__DSA_SKB_CB(nskb) = *__DSA_SKB_CB(skb); }
-#define DSA_SKB_CB_ZERO(skb)			\
-	{ *__DSA_SKB_CB(skb) = (struct __dsa_skb_cb) {0}; }
 #define DSA_SKB_CB_PRIV(skb)			\
 	((void *)(skb)->cb + offsetof(struct __dsa_skb_cb, priv))
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index fe7b6a62e8f1..9892ca1f6859 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -463,6 +463,8 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 	s->tx_bytes += skb->len;
+	DSA_SKB_CB(skb)->deferred_xmit = false;
 	/* Identify PTP protocol packets, clone them, and pass them to the
 	 * switch driver

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