cpmac: fix the receiving of 802.1q frames
Despite what the comment above CPMAC_SKB_SIZE says, the hardware also needs to account for the FCS length in a received frame. This patch fix the receiving of 802.1q frames which have 4 more bytes. While at it unhardcode the definition and use the one from if_vlan.h. Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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