From: Lorenzo Bianconi <lorenzo@kernel.org>
To: netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: davem@davemloft.net, ast@kernel.org, brouer@redhat.com,
daniel@iogearbox.net, toke@redhat.com,
lorenzo.bianconi@redhat.com, dsahern@kernel.org,
andrii.nakryiko@gmail.com
Subject: [PATCH v5 bpf-next 6/9] bpf: cpumap: implement XDP_REDIRECT for eBPF programs attached to map entries
Date: Tue, 30 Jun 2020 14:49:41 +0200 [thread overview]
Message-ID: <a98ca70076acc847a2e8db6c53c8dbbc794bf913.1593521030.git.lorenzo@kernel.org> (raw)
In-Reply-To: <cover.1593521029.git.lorenzo@kernel.org>
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
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
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>
---
include/net/xdp.h | 1 +
include/trace/events/xdp.h | 6 ++++--
kernel/bpf/cpumap.c | 17 +++++++++++++++--
3 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 83b9e0142b52..5be0d4d65b94 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -99,6 +99,7 @@ struct xdp_frame {
};
struct xdp_cpumap_stats {
+ unsigned int redirect;
unsigned int pass;
unsigned int drop;
};
diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h
index e2c99f5bee39..cd24e8a59529 100644
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -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,
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index 32f627bfc67c..70551303bb7e 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -237,7 +237,7 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
if (!rcpu->prog)
return n;
- rcu_read_lock();
+ rcu_read_lock_bh();
xdp_set_return_frame_no_direct();
xdp.rxq = &rxq;
@@ -266,6 +266,16 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
stats->pass++;
}
break;
+ case XDP_REDIRECT:
+ err = xdp_do_redirect(xdpf->dev_rx, &xdp,
+ prog);
+ if (unlikely(err)) {
+ xdp_return_frame(xdpf);
+ stats->drop++;
+ } else {
+ stats->redirect++;
+ }
+ break;
default:
bpf_warn_invalid_xdp_action(act);
/* fallthrough */
@@ -276,9 +286,12 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
}
}
+ if (stats->redirect)
+ xdp_do_flush_map();
+
xdp_clear_return_frame_no_direct();
- rcu_read_unlock();
+ rcu_read_unlock_bh(); /* resched point, may call do_softirq() */
return nframes;
}
--
2.26.2
next prev parent reply other threads:[~2020-06-30 12:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 12:49 [PATCH v5 bpf-next 0/9] introduce support for XDP programs in CPUMAP Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 1/9] cpumap: use non-locked version __ptr_ring_consume_batched Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 2/9] net: refactor xdp_convert_buff_to_frame Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 3/9] samples/bpf: xdp_redirect_cpu_user: do not update bpf maps in option loop Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 4/9] cpumap: formalize map value as a named struct Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 5/9] bpf: cpumap: add the possibility to attach an eBPF program to cpumap Lorenzo Bianconi
2020-07-01 23:02 ` Daniel Borkmann
2020-07-03 15:46 ` Lorenzo Bianconi
2020-07-01 23:39 ` Daniel Borkmann
2020-07-03 20:48 ` Lorenzo Bianconi
2020-07-03 22:24 ` Daniel Borkmann
2020-06-30 12:49 ` Lorenzo Bianconi [this message]
2020-06-30 12:49 ` [PATCH v5 bpf-next 7/9] libbpf: add SEC name for xdp programs attached to CPUMAP Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 8/9] samples/bpf: xdp_redirect_cpu: load a eBPF program on cpumap Lorenzo Bianconi
2020-06-30 12:49 ` [PATCH v5 bpf-next 9/9] selftest: add tests for XDP programs in CPUMAP entries Lorenzo Bianconi
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