From: Bogdan Hamciuc <bogdan.hamciuc@freescale.com>
Date: Wed, 29 Jul 2015 09:45:58 +0000 (+0300)
Subject: net: pktgen: Observe needed_headroom of the device
X-Git-Tag: firefly_0821_release~176^2~1159^2~269
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=879c7220e828;p=firefly-linux-kernel-4.4.55.git

net: pktgen: Observe needed_headroom of the device

Allocate enough space so as not to force the outgoing net device to do
skb_realloc_headroom().

Signed-off-by: Bogdan Hamciuc <bogdan.hamciuc@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 1ebdf1c0d118..5961da69cb03 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2279,7 +2279,7 @@ static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
 
 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
 {
-	pkt_dev->pkt_overhead = 0;
+	pkt_dev->pkt_overhead = LL_RESERVED_SPACE(pkt_dev->odev);
 	pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
 	pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
 	pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
@@ -2788,6 +2788,7 @@ static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
 	} else {
 		 skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
 	}
+	skb_reserve(skb, LL_RESERVED_SPACE(dev));
 
 	return skb;
 }