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rocker: mark copy-to-cpu pkts as forwarding offloaded

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For pkts copied to the CPU (to be processed by guest driver), mark the Rx
descriptor with flag "OFFLOAD_FWD" to indicate device has already forwarded
pkt.  The guest driver will use this indicator to avoid duplicate
forwarding in the guest OS.

Examples include bcast/mcast/unknown ucast pkts flooded to bridged ports.
We want to avoid both the device and the guest bridge driver flooding these
pkts, which would result in duplicates pkts on the wire.  Packet sampling,
such as sFlow, can also use this technique to mark pkts for the guest OS to
record but otherwise drop.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Message-id: 1435746792-41278-5-git-send-email-sfeldma@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Scott Feldman 2015-07-01 03:33:11 -07:00 • committed by Stefan Hajnoczi
parent 96497af0af
commit d0d2555852
5 changed files with 15 additions and 3 deletions
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5
hw/net/rocker/rocker_of_dpa.c
View file

@ -825,6 +825,8 @@ static OfDpaGroup *of_dpa_group_alloc(uint32_t id)
static void of_dpa_output_l2_interface(OfDpaFlowContext *fc,
OfDpaGroup *group)
{
uint8_t copy_to_cpu = fc->action_set.apply.copy_to_cpu;
if (group->l2_interface.pop_vlan) {
of_dpa_flow_pkt_strip_vlan(fc);
}
@ -837,7 +839,8 @@ static void of_dpa_output_l2_interface(OfDpaFlowContext *fc,
*/
if (group->l2_interface.out_pport == 0) {
rx_produce(fc->of_dpa->world, fc->in_pport, fc->iov, fc->iovcnt);
rx_produce(fc->of_dpa->world, fc->in_pport, fc->iov, fc->iovcnt,
copy_to_cpu);
} else if (group->l2_interface.out_pport != fc->in_pport) {
rocker_port_eg(world_rocker(fc->of_dpa->world),
group->l2_interface.out_pport,