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hv_netvsc: Fix a network regression after ifdown/ifup

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Recently people reported the NIC stops working after
"ifdown eth0; ifup eth0". It turns out in this case the TX queues are not
enabled, after the refactoring of the common detach logic: when the NIC
has sub-channels, usually we enable all the TX queues after all
sub-channels are set up: see rndis_set_subchannel() ->
netif_device_attach(), but in the case of "ifdown eth0; ifup eth0" where
the number of channels doesn't change, we also must make sure the TX queues
are enabled. The patch fixes the regression.

Fixes: 7b2ee50c0c ("hv_netvsc: common detach logic")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dexuan Cui 2018-06-06 21:32:51 +00:00 committed by David S. Miller
parent fd3a886258
commit 52acf73b6e
1 changed files with 3 additions and 1 deletions
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4
drivers/net/hyperv/netvsc_drv.c
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@ -127,8 +127,10 @@ static int netvsc_open(struct net_device *net)
}
rdev = nvdev->extension;
if (!rdev->link_state)
if (!rdev->link_state) {
netif_carrier_on(net);
netif_tx_wake_all_queues(net);
}
if (vf_netdev) {
/* Setting synthetic device up transparently sets