From: Xie He
Date: Mon, 28 Sep 2020 05:56:43 -0700
> The fr_hard_header function is used to prepend the header to skbs before
> transmission. It is used in 3 situations:
> 1) When a control packet is generated internally in this driver;
> 2) When a user sends an skb on an Ethernet-emulating PVC
The fr_hard_header function is used to prepend the header to skbs before
transmission. It is used in 3 situations:
1) When a control packet is generated internally in this driver;
2) When a user sends an skb on an Ethernet-emulating PVC device;
3) When a user sends an skb on a normal PVC device.
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