releases/3.19.2/net-pktgen-disable-xmit_clone-on-virtual-devices.patch

   1 From foo@baz Wed Mar 11 11:44:33 CET 2015
   2 From: Eric Dumazet <edumazet@google.com>
   3 Date: Sun, 22 Feb 2015 17:03:41 -0800
   4 Subject: net: pktgen: disable xmit_clone on virtual devices
   5
   6 From: Eric Dumazet <edumazet@google.com>
   7
   8 [ Upstream commit 52d6c8c6ca125872459054daa70f2f1c698c8e75 ]
   9
  10 Trying to use burst capability (aka xmit_more) on a virtual device
  11 like bonding is not supported.
  12
  13 For example, skb might be queued multiple times on a qdisc, with
  14 various list corruptions.
  15
  16 Fixes: 38b2cf2982dc ("net: pktgen: packet bursting via skb->xmit_more")
  17 Signed-off-by: Eric Dumazet <edumazet@google.com>
  18 Cc: Alexei Starovoitov <ast@plumgrid.com>
  19 Acked-by: Alexei Starovoitov <ast@plumgrid.com>
  20 Signed-off-by: David S. Miller <davem@davemloft.net>
  21 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  22 ---
  23  net/core/pktgen.c |    3 +++
  24  1 file changed, 3 insertions(+)
  25
  26 --- a/net/core/pktgen.c
  27 +++ b/net/core/pktgen.c
  28 @@ -1134,6 +1134,9 @@ static ssize_t pktgen_if_write(struct fi
  29                         return len;
  30
  31                 i += len;
  32 +               if ((value > 1) &&
  33 +                   (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
  34 +                       return -ENOTSUPP;
  35                 pkt_dev->burst = value < 1 ? 1 : value;
  36                 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
  37                 return count;