src/patches/linux/0011-hyperv-Change-the-receive-buffer-size-for-legacy-hos.patch

   1 From 56b3f72d3fed7f9b8d17dcf5d81455fa1b4327d7 Mon Sep 17 00:00:00 2001
   2 From: Haiyang Zhang <haiyangz@microsoft.com>
   3 Date: Sun, 9 Mar 2014 16:10:59 -0700
   4 Subject: [PATCH 11/25] hyperv: Change the receive buffer size for legacy hosts
   5
   6 Due to a bug in the Hyper-V host verion 2008R2, we need to use a slightly smaller
   7 receive buffer size, otherwise the buffer will not be accepted by the legacy hosts.
   8
   9 Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12  drivers/net/hyperv/hyperv_net.h | 1 +
  13  drivers/net/hyperv/netvsc.c     | 6 +++++-
  14  2 files changed, 6 insertions(+), 1 deletion(-)
  15
  16 diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
  17 index 7d06b4959383..13010b4dae5b 100644
  18 --- a/drivers/net/hyperv/hyperv_net.h
  19 +++ b/drivers/net/hyperv/hyperv_net.h
  20 @@ -513,6 +513,7 @@ struct nvsp_message {
  21  #define NETVSC_MTU 65536
  22
  23  #define NETVSC_RECEIVE_BUFFER_SIZE             (1024*1024*16)  /* 16MB */
  24 +#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY      (1024*1024*15)  /* 15MB */
  25
  26  #define NETVSC_RECEIVE_BUFFER_ID               0xcafe
  27
  28 diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
  29 index 1a0280dcba7e..daddea2654ce 100644
  30 --- a/drivers/net/hyperv/netvsc.c
  31 +++ b/drivers/net/hyperv/netvsc.c
  32 @@ -365,6 +365,11 @@ static int netvsc_connect_vsp(struct hv_device *device)
  33                 goto cleanup;
  34
  35         /* Post the big receive buffer to NetVSP */
  36 +       if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
  37 +               net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
  38 +       else
  39 +               net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
  40 +
  41         ret = netvsc_init_recv_buf(device);
  42
  43  cleanup:
  44 @@ -898,7 +903,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
  45         ndev = net_device->ndev;
  46
  47         /* Initialize the NetVSC channel extension */
  48 -       net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
  49         spin_lock_init(&net_device->recv_pkt_list_lock);
  50
  51         INIT_LIST_HEAD(&net_device->recv_pkt_list);
  52 --
  53 2.4.3
  54