linux-kernel - [PATCH 3.19 019/177] net: pktgen: disable xmit

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Message-Id: <20150316140813.962559838@linuxfoundation.org>
Date:	Mon, 16 Mar 2015 15:07:06 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.19 019/177] net: pktgen: disable xmit_clone on virtual devices

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 52d6c8c6ca125872459054daa70f2f1c698c8e75 ]

Trying to use burst capability (aka xmit_more) on a virtual device
like bonding is not supported.

For example, skb might be queued multiple times on a qdisc, with
various list corruptions.

Fixes: 38b2cf2982dc ("net: pktgen: packet bursting via skb->xmit_more")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Acked-by: Alexei Starovoitov <ast@...mgrid.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/pktgen.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1134,6 +1134,9 @@ static ssize_t pktgen_if_write(struct fi
 			return len;
 
 		i += len;
+		if ((value > 1) &&
+		    (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
+			return -ENOTSUPP;
 		pkt_dev->burst = value < 1 ? 1 : value;
 		sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
 		return count;


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