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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>
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 Daniel Borkmann
parent 644bfe51fa
commit 9216477449
7 changed files with 148 additions and 17 deletions
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5
tools/include/uapi/linux/bpf.h
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@@ -227,6 +227,7 @@ enum bpf_attach_type {
BPF_CGROUP_INET6_GETSOCKNAME,
BPF_XDP_DEVMAP,
BPF_CGROUP_INET_SOCK_RELEASE,
BPF_XDP_CPUMAP,
__MAX_BPF_ATTACH_TYPE
};
@@ -3856,6 +3857,10 @@ struct bpf_devmap_val {
*/
struct bpf_cpumap_val {
__u32 qsize; /* queue size to remote target CPU */
union {
int fd; /* prog fd on map write */
__u32 id; /* prog id on map read */
} bpf_prog;
};
enum sk_action {