diff options
| author | Dexuan Cui <decui@microsoft.com> | 2020-09-08 21:08:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-09-10 12:55:40 -0700 |
| commit | da26658c3d7005aa67a706dceff7b2807b59e123 (patch) | |
| tree | 26ce0b29d4f8096c65e5034758ed2d324be2592c /drivers/net/hyperv | |
| parent | de214e52de1bba5392b5b7054924a08dbd57c2f6 (diff) | |
| download | linux-da26658c3d7005aa67a706dceff7b2807b59e123.tar.bz2 | |
hv_netvsc: Cache the current data path to avoid duplicate call and message
The previous change "hv_netvsc: Switch the data path at the right time
during hibernation" adds the call of netvsc_vf_changed() upon
NETDEV_CHANGE, so it's necessary to avoid the duplicate call and message
when the VF is brought UP or DOWN.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hyperv')
| -rw-r--r-- | drivers/net/hyperv/hyperv_net.h | 3 | ||||
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 21 |
2 files changed, 23 insertions, 1 deletions
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index 2181d4538ab7..ff33f27cdcd3 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -974,6 +974,9 @@ struct net_device_context { /* Serial number of the VF to team with */ u32 vf_serial; + /* Is the current data path through the VF NIC? */ + bool data_path_is_vf; + /* Used to temporarily save the config info across hibernation */ struct netvsc_device_info *saved_netvsc_dev_info; }; diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 4a25886e2346..b7db3766f5b9 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2366,7 +2366,16 @@ static int netvsc_register_vf(struct net_device *vf_netdev) return NOTIFY_OK; } -/* VF up/down change detected, schedule to change data path */ +/* Change the data path when VF UP/DOWN/CHANGE are detected. + * + * Typically a UP or DOWN event is followed by a CHANGE event, so + * net_device_ctx->data_path_is_vf is used to cache the current data path + * to avoid the duplicate call of netvsc_switch_datapath() and the duplicate + * message. + * + * During hibernation, if a VF NIC driver (e.g. mlx5) preserves the network + * interface, there is only the CHANGE event and no UP or DOWN event. + */ static int netvsc_vf_changed(struct net_device *vf_netdev) { struct net_device_context *net_device_ctx; @@ -2383,6 +2392,10 @@ static int netvsc_vf_changed(struct net_device *vf_netdev) if (!netvsc_dev) return NOTIFY_DONE; + if (net_device_ctx->data_path_is_vf == vf_is_up) + return NOTIFY_OK; + net_device_ctx->data_path_is_vf = vf_is_up; + netvsc_switch_datapath(ndev, vf_is_up); netdev_info(ndev, "Data path switched %s VF: %s\n", vf_is_up ? "to" : "from", vf_netdev->name); @@ -2624,6 +2637,12 @@ static int netvsc_resume(struct hv_device *dev) rtnl_lock(); net_device_ctx = netdev_priv(net); + + /* Reset the data path to the netvsc NIC before re-opening the vmbus + * channel. Later netvsc_netdev_event() will switch the data path to + * the VF upon the UP or CHANGE event. + */ + net_device_ctx->data_path_is_vf = false; device_info = net_device_ctx->saved_netvsc_dev_info; ret = netvsc_attach(net, device_info); |