[email protected] wrote:
Yes, it is. It is a mandatory feature for certain protocols, such as
the industrial control protocol "EtherNet/IP"
http://en.wikipedia.org/wiki/Ethernet/IP
That's interesting. Since I know of at least one Ethernet/IP stack being
ported to linux, do you know whether/how linux allows changing the VLAN
header per socket?
The problem with adding VLAN PCP to LwIP is that a socket level
variable must somehow be communicated down to the link layer for each
frame. There does not seem to be a easy way of doing this.
Thinkig about it, we already have a mechanism for that: the per-pcb ARP
entry cache. In the same manner as this, we could add members to struct
netif which configure VLAN settings and change them before calling one
of the ip_output functions (although that set/reset code would be
scattered around tcp, udp, raw, icmp and igmp).
Simon
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