From: Stephen Hemminger stephen@networkplumber.org
[ Upstream commit 7c9864bbccc23e1812ac82966555d68c13ea4006 ]
If the accelerated networking SRIOV VF device has lost carrier use the synthetic network device which is available as backup path. This is a rare case since if VF link goes down, normally the VMBus device will also loose external connectivity as well. But if the communication is between two VM's on the same host the VMBus device will still work.
Reported-by: "Shah, Ashish N" ashish.n.shah@intel.com Fixes: 0c195567a8f6 ("netvsc: transparent VF management") Signed-off-by: Stephen Hemminger stephen@networkplumber.org Reviewed-by: Haiyang Zhang haiyangz@microsoft.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/hyperv/netvsc_drv.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -543,12 +543,13 @@ static int netvsc_start_xmit(struct sk_b u32 hash; struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
- /* if VF is present and up then redirect packets - * already called with rcu_read_lock_bh + /* If VF is present and up then redirect packets to it. + * Skip the VF if it is marked down or has no carrier. + * If netpoll is in uses, then VF can not be used either. */ vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev); if (vf_netdev && netif_running(vf_netdev) && - !netpoll_tx_running(net)) + netif_carrier_ok(vf_netdev) && !netpoll_tx_running(net)) return netvsc_vf_xmit(net, vf_netdev, skb);
/* We will atmost need two pages to describe the rndis