1. 25 6月, 2017 1 次提交
    • J
      net: store port/representator id in metadata_dst · 3fcece12
      Jakub Kicinski 提交于
      Switches and modern SR-IOV enabled NICs may multiplex traffic from Port
      representators and control messages over single set of hardware queues.
      Control messages and muxed traffic may need ordered delivery.
      
      Those requirements make it hard to comfortably use TC infrastructure today
      unless we have a way of attaching metadata to skbs at the upper device.
      Because single set of queues is used for many netdevs stopping TC/sched
      queues of all of them reliably is impossible and lower device has to
      retreat to returning NETDEV_TX_BUSY and usually has to take extra locks on
      the fastpath.
      
      This patch attempts to enable port/representative devs to attach metadata
      to skbs which carry port id.  This way representatives can be queueless and
      all queuing can be performed at the lower netdev in the usual way.
      
      Traffic arriving on the port/representative interfaces will be have
      metadata attached and will subsequently be queued to the lower device for
      transmission.  The lower device should recognize the metadata and translate
      it to HW specific format which is most likely either a special header
      inserted before the network headers or descriptor/metadata fields.
      
      Metadata is associated with the lower device by storing the netdev pointer
      along with port id so that if TC decides to redirect or mirror the new
      netdev will not try to interpret it.
      
      This is mostly for SR-IOV devices since switches don't have lower netdevs
      today.
      Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
      Signed-off-by: NSridhar Samudrala <sridhar.samudrala@intel.com>
      Signed-off-by: NSimon Horman <horms@verge.net.au>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      3fcece12
  2. 24 6月, 2017 34 次提交
  3. 23 6月, 2017 5 次提交