45818bf1a0
This patch is intended to solve a specific problem that iavf(4) encounters, but what it does can be extended to solve other issues. To summarize the iavf(4) issue, if the PF driver configures VLAN anti-spoof, then the VF driver needs to make sure no untagged traffic is sent if a VLAN is configured, and vice-versa. This can be an issue when a VLAN is being registered or unregistered, e.g. when a packet may be on the ring with a VLAN in it, but the VLANs are being unregistered. This can cause that tagged packet to go out and cause an MDD event. To fix this, include a new interface-dependent function that drivers can implement named IFDI_NEEDS_RESTART(). Right now, this function is called in iflib_vlan_unregister/register() to determine whether the interface needs to be stopped and started when a VLAN is registered or unregistered. The default return value of IFDI_NEEDS_RESTART() is true, so this fixes the MDD problem that iavf(4) encounters, since the interface rings are flushed during a stop/init. A future change to iavf(4) will implement that function just in case the default value changes, and to make it explicit that this interface reset is required when a VLAN is added or removed. Reviewed by: gallatin@ MFC after: 1 week Sponsored by: Intel Corporation Differential Revision: https://reviews.freebsd.org/D22086
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