src/patches/linux/0015-hyperv-Properly-handle-checksum-offload.patch

   1 From 540360773bad2b81f14c38ca92b62797fa32cbc6 Mon Sep 17 00:00:00 2001
   2 From: KY Srinivasan <kys@microsoft.com>
   3 Date: Wed, 30 Apr 2014 11:58:25 -0700
   4 Subject: [PATCH 15/25] hyperv: Properly handle checksum offload
   5
   6 Do checksum offload only if the client of the driver wants checksum to be
   7 offloaded.
   8
   9 In V1 version of this patch, I  addressed comments from
  10 Stephen Hemminger <stephen@networkplumber.org> and
  11 Eric Dumazet <eric.dumazet@gmail.com>.
  12
  13 In this version of the patch I have addressed comments from
  14 David Miller.
  15
  16 This patch fixes a bug that is exposed in gateway scenarios.
  17
  18 Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
  19 Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
  20 Signed-off-by: David S. Miller <davem@davemloft.net>
  21 ---
  22  drivers/net/hyperv/netvsc_drv.c | 4 ++++
  23  1 file changed, 4 insertions(+)
  24
  25 diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
  26 index 0d898876689e..ce6d870dd7ae 100644
  27 --- a/drivers/net/hyperv/netvsc_drv.c
  28 +++ b/drivers/net/hyperv/netvsc_drv.c
  29 @@ -383,6 +383,10 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
  30         if (skb_is_gso(skb))
  31                 goto do_lso;
  32
  33 +       if ((skb->ip_summed == CHECKSUM_NONE) ||
  34 +           (skb->ip_summed == CHECKSUM_UNNECESSARY))
  35 +               goto do_send;
  36 +
  37         rndis_msg_size += NDIS_CSUM_PPI_SIZE;
  38         ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
  39                             TCPIP_CHKSUM_PKTINFO);
  40 --
  41 2.4.3
  42