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For supporting XDP_REDIRECT, a device driver must (obviously)
implement the "TX" function ndo_xdp_xmit(). An additional requirement
is you cannot TX out a device, unless it also have a xdp bpf program
attached. This dependency is caused by the driver code need to setup
XDP resources before it can ndo_xdp_xmit.
Update bpf samples xdp_redirect and xdp_redirect_map to automatically
attach a dummy XDP program to the configured ifindex_out device. Use
the XDP flag XDP_FLAGS_UPDATE_IF_NOEXIST on the dummy load, to avoid
overriding an existing XDP prog on the device.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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When testing with a driver that has both native and generic redirect support:
$ sudo ./samples/bpf/xdp_redirect -N 5 6
input: 5 output: 6
ifindex 6: 4961879 pkt/s
ifindex 6: 6391319 pkt/s
ifindex 6: 6419468 pkt/s
$ sudo ./samples/bpf/xdp_redirect -S 5 6
input: 5 output: 6
ifindex 6: 1845435 pkt/s
ifindex 6: 3882850 pkt/s
ifindex 6: 3893974 pkt/s
$ sudo ./samples/bpf/xdp_redirect_map -N 5 6
input: 5 output: 6
map[0] (vports) = 4, map[1] (map) = 5, map[2] (count) = 0
ifindex 6: 2207374 pkt/s
ifindex 6: 6212869 pkt/s
ifindex 6: 6286515 pkt/s
$ sudo ./samples/bpf/xdp_redirect_map -S 5 6
input: 5 output: 6
map[0] (vports) = 4, map[1] (map) = 5, map[2] (count) = 0
ifindex 6: 5052528 pkt/s
ifindex 6: 5736631 pkt/s
ifindex 6: 5739962 pkt/s
Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: Andy Gospodarek <andy@greyhouse.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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