src/patches/linux-3.14.x-hyperv-2008-fix.patch

   1 From 99d3016de4f2a29635f5382b0e9bd0e5f2151487 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: 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 diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
  13 index 7d06b49..13010b4 100644
  14 --- a/drivers/net/hyperv/hyperv_net.h
  15 +++ b/drivers/net/hyperv/hyperv_net.h
  16 @@ -513,6 +513,7 @@ struct nvsp_message {
  17  #define NETVSC_MTU 65536
  18
  19  #define NETVSC_RECEIVE_BUFFER_SIZE             (1024*1024*16)  /* 16MB */
  20 +#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY      (1024*1024*15)  /* 15MB */
  21
  22  #define NETVSC_RECEIVE_BUFFER_ID               0xcafe
  23
  24 diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
  25 index 1a0280d..daddea2 100644
  26 --- a/drivers/net/hyperv/netvsc.c
  27 +++ b/drivers/net/hyperv/netvsc.c
  28 @@ -365,6 +365,11 @@ static int netvsc_connect_vsp(struct hv_device *device)
  29                 goto cleanup;
  30
  31         /* Post the big receive buffer to NetVSP */
  32 +       if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
  33 +               net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
  34 +       else
  35 +               net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
  36 +
  37         ret = netvsc_init_recv_buf(device);
  38
  39  cleanup:
  40 @@ -898,7 +903,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info)
  41         ndev = net_device->ndev;
  42
  43         /* Initialize the NetVSC channel extension */
  44 -       net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
  45         spin_lock_init(&net_device->recv_pkt_list_lock);
  46
  47         INIT_LIST_HEAD(&net_device->recv_pkt_list);
  48 --
  49 cgit v0.10.2
  50