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bpf: cpumap: Implement XDP_REDIRECT for eBPF programs attached to map entries

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Introduce XDP_REDIRECT support for eBPF programs attached to cpumap
entries.
This patch has been tested on Marvell ESPRESSObin using a modified
version of xdp_redirect_cpu sample in order to attach a XDP program
to CPUMAP entries to perform a redirect on the mvneta interface.
In particular the following scenario has been tested:

rq (cpu0) --> mvneta - XDP_REDIRECT (cpu0) --> CPUMAP - XDP_REDIRECT (cpu1) --> mvneta

$./xdp_redirect_cpu -p xdp_cpu_map0 -d eth0 -c 1 -e xdp_redirect \
	-f xdp_redirect_kern.o -m tx_port -r eth0

tx: 285.2 Kpps rx: 285.2 Kpps

Attaching a simple XDP program on eth0 to perform XDP_TX gives
comparable results:

tx: 288.4 Kpps rx: 288.4 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/2cf8373a731867af302b00c4ff16c122630c4980.1594734381.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi
2020-07-14 15:56:39 +02:00
committed by Daniel Borkmann
parent 9216477449
commit 28b1520ebf
3 changed files with 20 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/trace/events/xdp.h
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@@ -190,6 +190,7 @@ TRACE_EVENT(xdp_cpumap_kthread,
__field(int, sched)
__field(unsigned int, xdp_pass)
__field(unsigned int, xdp_drop)
__field(unsigned int, xdp_redirect)
),
TP_fast_assign(
@@ -201,18 +202,19 @@ TRACE_EVENT(xdp_cpumap_kthread,
__entry->sched = sched;
__entry->xdp_pass = xdp_stats->pass;
__entry->xdp_drop = xdp_stats->drop;
__entry->xdp_redirect = xdp_stats->redirect;
),
TP_printk("kthread"
" cpu=%d map_id=%d action=%s"
" processed=%u drops=%u"
" sched=%d"
" xdp_pass=%u xdp_drop=%u",
" xdp_pass=%u xdp_drop=%u xdp_redirect=%u",
__entry->cpu, __entry->map_id,
__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
__entry->processed, __entry->drops,
__entry->sched,
__entry->xdp_pass, __entry->xdp_drop)
__entry->xdp_pass, __entry->xdp_drop, __entry->xdp_redirect)
);
TRACE_EVENT(xdp_cpumap_enqueue,