On 3/19/2019 6:29 AM, pei Jikui wrote:
hi,
1) I am reading the OVS source code about how a GRE interface in OVS
receives packets into OVS bridge.
I found there are two places that the GRE packets will possibly
be received into OVS bridge.
a) . The first place is when we create a gre interface with
gre_create->ovs_netdev_link->netdev_rx_handler_register
The register rx_handler is netdev_frame_hook which will
receive the packets into the ovs bridge.
b) The second place is located at the dp_init which will register
a packet handler function gre_rcv for GRE protocol packets.
gre_rcv will also receive the packets to OVS bridge.
2) My questions are,
a) Which is the real receive handler for the GRE packets?
b) Is it possible that the packets could be received by both of
the two cases. If yes, for which scenarios will be match to each one?
OVS supports a user space datapath and a kernel datapath so it depends
on whether you're using the user space datapath or the kernel datapath.
- Greg
Thanks much.
Jikui
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