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UPSTREAM: bpf: cpumap: Add the possibility to attach an eBPF program to cpumap

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Introduce the capability to attach an eBPF program to cpumap entries.
The idea behind this feature is to add the possibility to define on
which CPU run the eBPF program if the underlying hw does not support
RSS. Current supported verdicts are XDP_DROP and XDP_PASS.

This patch has been tested on Marvell ESPRESSObin using xdp_redirect_cpu
sample available in the kernel tree to identify possible performance
regressions. Results show there are no observable differences in
packet-per-second:

$./xdp_redirect_cpu --progname xdp_cpu_map0 --dev eth0 --cpu 1
rx: 354.8 Kpps
rx: 356.0 Kpps
rx: 356.8 Kpps
rx: 356.3 Kpps
rx: 356.6 Kpps
rx: 356.6 Kpps
rx: 356.7 Kpps
rx: 355.8 Kpps
rx: 356.8 Kpps
rx: 356.8 Kpps

Co-developed-by: Jesper Dangaard Brouer <brouer@redhat.com>
Change-Id: Ib09a822f483667441e6b287a3ac694a82e9e3e0f
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/bpf/5c9febdf903d810b3415732e5cd98491d7d9067a.1594734381.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2020-07-14 15:56:38 +02:00 • committed by basamaryan
commit 8dc9e8ccbe
No known key found for this signature in database
GPG key ID: 210D5384FB2A5885
7 changed files with 148 additions and 17 deletions
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5
include/net/xdp.h
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@ -103,6 +103,11 @@ struct xdp_frame {
struct net_device *dev_rx; /* used by cpumap */
};
struct xdp_cpumap_stats {
unsigned int pass;
unsigned int drop;
};
/* Clear kernel pointers in xdp_frame */
static inline void xdp_scrub_frame(struct xdp_frame *frame)
{