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Date: Fri, 2 May 2014 15:18:12 +0800 From: Zhouyi Zhou <zhouzhouyi@...il.com> To: <davem@...emloft.net>, <steffen.klassert@...unet.com>, <fan.du@...driver.com>, <dborkman@...hat.com>, <minipli@...glemail.com>, <tgraf@...g.ch>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org> Cc: Zhouyi Zhou <zhouzhouyi@...il.com>, Zhouyi Zhou <yizhouzhou@....ac.cn> Subject: [PATCH] netdev: pktgen xmit packet through vlan interface As http://www.spinics.net/lists/netdev/msg165015.html pktgen generates shared packet through vlan interface will cause oops because of duplicate entering tc queue. Try to solve this problem by means of packet clone instead of sharing. Signed-off-by: Zhouyi Zhou <yizhouzhou@....ac.cn> --- net/core/pktgen.c | 20 +++++++++++++++++--- 1 files changed, 17 insertions(+), 3 deletions(-) diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 0304f98..ced07fc 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -3297,6 +3297,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev) netdev_tx_t (*xmit)(struct sk_buff *, struct net_device *) = odev->netdev_ops->ndo_start_xmit; struct netdev_queue *txq; + struct sk_buff *nskb = NULL; u16 queue_map; int ret; @@ -3347,8 +3348,18 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev) pkt_dev->last_ok = 0; goto unlock; } - atomic_inc(&(pkt_dev->skb->users)); - ret = (*xmit)(pkt_dev->skb, odev); + + if (pkt_dev->clone_skb && is_vlan_dev(odev)) { + nskb = skb_clone(pkt_dev->skb, GFP_ATOMIC); + ret = -ENOMEM; + if (nskb) + ret = (*xmit)(nskb, odev); + else + nskb = ERR_PTR(ret); + } else { + atomic_inc(&(pkt_dev->skb->users)); + ret = (*xmit)(pkt_dev->skb, odev); + } switch (ret) { case NETDEV_TX_OK: @@ -3372,7 +3383,10 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev) case NETDEV_TX_LOCKED: case NETDEV_TX_BUSY: /* Retry it next time */ - atomic_dec(&(pkt_dev->skb->users)); + if (nskb && !IS_ERR(nskb)) + kfree_skb(nskb); + else + atomic_dec(&(pkt_dev->skb->users)); pkt_dev->last_ok = 0; } unlock: -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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