Merge branch 'XDP-redirect-tracepoints'

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Jesper Dangaard Brouer says:

====================
XDP redirect tracepoints

I feel this is as far as I can take the tracepoint infrastructure to
assist XDP monitoring.

Tracepoints comes with a base overhead of 25 nanosec for an attached
bpf_prog, and 48 nanosec for using a full perf record. This is
problematic for the XDP use-case, but it is very convenient to use the
existing perf infrastructure.

From a performance perspective, the real solution would be to attach
another bpf_prog (that understand xdp_buff), but I'm not sure we want
to introduce yet another bpf attach API for this.

One thing left is to standardize the possible err return codes, to a
limited set, to allow easier (and faster) mapping into a bpf map.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

David S. Miller 2017-08-29 10:51:29 -07:00

parent d0fcece770 3ffab54602

commit 25d4dae1a6

9 changed files with 543 additions and 46 deletions

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100

include/trace/events/xdp.h

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37

net/core/filter.c

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4

samples/bpf/Makefile

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88

samples/bpf/xdp_monitor_kern.c

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295

samples/bpf/xdp_monitor_user.c

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11

samples/bpf/xdp_redirect_kern.c

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11

samples/bpf/xdp_redirect_map_kern.c

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22

samples/bpf/xdp_redirect_map_user.c

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samples/bpf/xdp_redirect_user.c

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