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hv_netvsc: Mark VF as slave before exposing it to user-mode 

commit c807d6cd089d2f4951baa838081ec5ae3e2360f8 upstream.

When a VF is being exposed form the kernel, it should be marked as "slave"
before exposing to the user-mode. The VF is not usable without netvsc
running as master. The user-mode should never see a VF without the "slave"
flag.

This commit moves the code of setting the slave flag to the time before
VF is exposed to user-mode.

Cc: stable@vger.kernel.org
Fixes: 0c195567a8 ("netvsc: transparent VF management")
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Long Li 2023-11-19 08:23:43 -08:00 committed by Greg Kroah-Hartman
parent 5dd83db613
commit c4d3957510
1 changed files with 23 additions and 9 deletions
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32
drivers/net/hyperv/netvsc_drv.c
View File

@ -2204,9 +2204,6 @@ static int netvsc_vf_join(struct net_device *vf_netdev,
goto upper_link_failed;
}
/* set slave flag before open to prevent IPv6 addrconf */
vf_netdev->flags |= IFF_SLAVE;
schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
@ -2313,16 +2310,18 @@ static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev)
}
/* Fallback path to check synthetic vf with
* help of mac addr
/* Fallback path to check synthetic vf with help of mac addr.
* Because this function can be called before vf_netdev is
* initialized (NETDEV_POST_INIT) when its perm_addr has not been copied
* from dev_addr, also try to match to its dev_addr.
* Note: On Hyper-V and Azure, it's not possible to set a MAC address
* on a VF that matches to the MAC of a unrelated NETVSC device.
*/
list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
ndev = hv_get_drvdata(ndev_ctx->device_ctx);
if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr)) {
netdev_notice(vf_netdev,
"falling back to mac addr based matching\n");
if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr) ||
ether_addr_equal(vf_netdev->dev_addr, ndev->perm_addr))
return ndev;
}
}
netdev_notice(vf_netdev,
@ -2330,6 +2329,19 @@ static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev)
return NULL;
}
static int netvsc_prepare_bonding(struct net_device *vf_netdev)
{
struct net_device *ndev;
ndev = get_netvsc_byslot(vf_netdev);
if (!ndev)
return NOTIFY_DONE;
/* set slave flag before open to prevent IPv6 addrconf */
vf_netdev->flags |= IFF_SLAVE;
return NOTIFY_DONE;
}
static int netvsc_register_vf(struct net_device *vf_netdev)
{
struct net_device_context *net_device_ctx;
@ -2754,6 +2766,8 @@ static int netvsc_netdev_event(struct notifier_block *this,
return NOTIFY_DONE;
switch (event) {
case NETDEV_POST_INIT:
return netvsc_prepare_bonding(event_dev);
case NETDEV_REGISTER:
return netvsc_register_vf(event_dev);
case NETDEV_UNREGISTER: