• Florian Fainelli's avatar
    net: dsa: reduce number of protocol hooks · 3e8a72d1
    Florian Fainelli authored
    DSA is currently registering one packet_type function per EtherType it
    needs to intercept in the receive path of a DSA-enabled Ethernet device.
    Right now we have three of them: trailer, DSA and eDSA, and there might
    be more in the future, this will not scale to the addition of new
    protocols.
    
    This patch proceeds with adding a new layer of abstraction and two new
    functions:
    
    dsa_switch_rcv() which will dispatch into the tag-protocol specific
    receive function implemented by net/dsa/tag_*.c
    
    dsa_slave_xmit() which will dispatch into the tag-protocol specific
    transmit function implemented by net/dsa/tag_*.c
    
    When we do create the per-port slave network devices, we iterate over
    the switch protocol to assign the DSA-specific receive and transmit
    operations.
    
    A new fake ethertype value is used: ETH_P_XDSA to illustrate the fact
    that this is no longer going to look like ETH_P_DSA or ETH_P_TRAILER
    like it used to be.
    
    This allows us to greatly simplify the check in eth_type_trans() and
    always override the skb->protocol with ETH_P_XDSA for Ethernet switches
    tagged protocol, while also reducing the number repetitive slave
    netdevice_ops assignments.
    Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    3e8a72d1
netdevice.h 114 KB