** Tags added: kernel-hyper-v
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1290151
Title:
hyper-v: Hyper-V network broken for Trusty on Server 2008R2
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Due to a bug in the Hyper-V host verion 2008R2, we need to use a
slightly smaller receive buffer size, otherwise the buffer will not
be accepted by the legacy hosts. Without this fix, the network driver
will not load while hosting Trusty on Server 2008R2. The following
patch addresses the problem:
[PATCH net-next] hyperv: Change the receive buffer size for legacy
hosts
Due to a bug in the Hyper-V host verion 2008R2, we need to use a slightly
smaller
receive buffer size, otherwise the buffer will not be accepted by the legacy
hosts.
Signed-off-by: Haiyang Zhang <haiya...@microsoft.com>
---
drivers/net/hyperv/hyperv_net.h | 1 +
drivers/net/hyperv/netvsc.c | 6 +++++-
2 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 39fc230..ea5f182 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -516,6 +516,7 @@ struct nvsp_message {
#define NETVSC_MTU 65536
#define NETVSC_RECEIVE_BUFFER_SIZE (1024*1024*16) /* 16MB */
+#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY (1024*1024*15) /* 15MB */
#define NETVSC_RECEIVE_BUFFER_ID 0xcafe
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 1a0280d..daddea2 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -365,6 +365,11 @@ static int netvsc_connect_vsp(struct hv_device *device)
goto cleanup;
/* Post the big receive buffer to NetVSP */
+ if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
+ net_device->recv_buf_size =
NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
+ else
+ net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
+
ret = netvsc_init_recv_buf(device);
cleanup:
@@ -898,7 +903,6 @@ int netvsc_device_add(struct hv_device *device, void
*additional_info)
ndev = net_device->ndev;
/* Initialize the NetVSC channel extension */
- net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
spin_lock_init(&net_device->recv_pkt_list_lock);
INIT_LIST_HEAD(&net_device->recv_pkt_list);
--
1.7.4.1
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1290151/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
