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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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9
net/core/dev.c
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@@ -5448,6 +5448,8 @@ static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
for (i = 0; i < new->aux->used_map_cnt; i++) {
if (dev_map_can_have_prog(new->aux->used_maps[i]))
return -EINVAL;
if (cpu_map_prog_allowed(new->aux->used_maps[i]))
return -EINVAL;
}
}
@@ -8875,6 +8877,13 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
return -EINVAL;
}
if (prog->expected_attach_type == BPF_XDP_CPUMAP) {
NL_SET_ERR_MSG(extack,
"BPF_XDP_CPUMAP programs can not be attached to a device");
bpf_prog_put(prog);
return -EINVAL;
}
/* prog->aux->id may be 0 for orphaned device-bound progs */
if (prog->aux->id && prog->aux->id == prog_id) {
bpf_prog_put(prog);