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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>
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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2
kernel/bpf/cpumap.c
View file

@ -578,7 +578,7 @@ static int bq_flush_to_queue(struct bpf_cpu_map_entry *rcpu,
err = __ptr_ring_produce(q, xdpf);
if (err) {
drops++;
xdp_return_frame(xdpf);
xdp_return_frame_rx_napi(xdpf);
}
processed++;
}

2
kernel/bpf/devmap.c
View file

@ -239,7 +239,7 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj,
err = dev->netdev_ops->ndo_xdp_xmit(dev, xdpf);
if (err) {
drops++;
xdp_return_frame(xdpf);
xdp_return_frame_rx_napi(xdpf);
} else {
sent++;
}