net: pktgen: disable xmit_clone on virtual devices

[ 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@google.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 9fa25b0ea1450f3e8a30c2afb6fe9fe623a7bacd..352d183ecba347432a9a4b8b3cc6c6fd0861858d 100644 (file)
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1134,6 +1134,9 @@ static ssize_t pktgen_if_write(struct file *file,
                        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;