xdp: introduce xdp_return_frame_rx_napi

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When sending an xdp_frame through xdp_do_redirect call, then error
cases can happen where the xdp_frame needs to be dropped, and
returning an -errno code isn't sufficient/possible any-longer
(e.g. for cpumap case). This is already fully supported, by simply
calling xdp_return_frame.

This patch is an optimization, which provides xdp_return_frame_rx_napi,
which is a faster variant for these error cases.  It take advantage of
the protection provided by XDP RX running under NAPI protection.

This change is mostly relevant for drivers using the page_pool
allocator as it can take advantage of this. (Tested with mlx5).

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Jesper Dangaard Brouer 2018-05-24 16:46:07 +02:00 • committed by Alexei Starovoitov

parent 9940fbf633

commit 389ab7f01a

5 changed files with 22 additions and 8 deletions

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5

include/net/page_pool.h

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1

include/net/xdp.h

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2

kernel/bpf/cpumap.c

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2

kernel/bpf/devmap.c

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20

net/core/xdp.c

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