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netvsc: handle offline mtu and channel change

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If device is not up, then changing MTU (or number of channels)
should not re-enable the device.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-03-22 14:50:58 -07:00 committed by David S. Miller
parent f4f1c23d6e
commit 163891d7d4
1 changed files with 20 additions and 9 deletions
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29
drivers/net/hyperv/netvsc_drv.c
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@ -743,6 +743,7 @@ static int netvsc_set_channels(struct net_device *net,
struct hv_device *dev = net_device_ctx->device_ctx;
struct netvsc_device *nvdev = net_device_ctx->nvdev;
unsigned int count = channels->combined_count;
bool was_running;
int ret;
/* We do not support separate count for rx, tx, or other */
@ -762,9 +763,12 @@ static int netvsc_set_channels(struct net_device *net,
if (count > nvdev->max_chn)
return -EINVAL;
ret = netvsc_close(net);
if (ret)
return ret;
was_running = netif_running(net);
if (was_running) {
ret = netvsc_close(net);
if (ret)
return ret;
}
net_device_ctx->start_remove = true;
rndis_filter_device_remove(dev, nvdev);
@ -775,9 +779,11 @@ static int netvsc_set_channels(struct net_device *net,
else
netvsc_set_queues(net, dev, nvdev->num_chn);
netvsc_open(net);
net_device_ctx->start_remove = false;
if (was_running)
ret = netvsc_open(net);
/* We may have missed link change notifications */
schedule_delayed_work(&net_device_ctx->dwork, 0);
@ -845,14 +851,18 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu)
struct netvsc_device *nvdev = ndevctx->nvdev;
struct hv_device *hdev = ndevctx->device_ctx;
struct netvsc_device_info device_info;
bool was_running;
int ret;
if (ndevctx->start_remove || !nvdev || nvdev->destroy)
return -ENODEV;
ret = netvsc_close(ndev);
if (ret)
goto out;
was_running = netif_running(ndev);
if (was_running) {
ret = netvsc_close(ndev);
if (ret)
return ret;
}
memset(&device_info, 0, sizeof(device_info));
device_info.ring_size = ring_size;
@ -872,10 +882,11 @@ static int netvsc_change_mtu(struct net_device *ndev, int mtu)
rndis_filter_device_add(hdev, &device_info);
out:
netvsc_open(ndev);
ndevctx->start_remove = false;
if (was_running)
ret = netvsc_open(ndev);
/* We may have missed link change notifications */
schedule_delayed_work(&ndevctx->dwork, 0);