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hv_netvsc: do not use VF device if link is down 

[ Upstream commit 7c9864bbcc ]

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: 0c195567a8 ("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>
5.4-rM2-2.2.x-imx-squashed
Stephen Hemminger 2020-08-04 09:54:15 -07:00 committed by Greg Kroah-Hartman
parent 3a82f4bfd2
commit 5d791d36a4
1 changed files with 4 additions and 3 deletions
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7
drivers/net/hyperv/netvsc_drv.c
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@ -531,12 +531,13 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
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