Tutorial improve parsing of VLANs (rebased #73) #168
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Given XDP is very performance focused, it is unwise to default parse many VLAN layers. Those 2 as it is very uncommon to have more. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
This is based on same function from packet-solutions/xdp_vlan02_kern.c that also extracts VLANs. It needs to be removed from packet-solutions/xdp_vlan02_kern.c, but for now its just ifdef defined out-of-code. Need to run some tests and look at BPF byte-code to make sure it does the right thing. The original parse_ethhdr() is implemented by calling parse_ethhdr_vlan() with NULL argument for stucture to collect IDs into. The compiler should remove the parts that are not needed. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
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Did some basic manual testing and it seems to work |
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This is a rebase of PR #73 which had a conflict with submodule system.