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Message-Id: <20210821002010.845777-20-memxor@gmail.com>
Date: Sat, 21 Aug 2021 05:50:07 +0530
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: bpf@...r.kernel.org
Cc: Kumar Kartikeya Dwivedi <memxor@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
netdev@...r.kernel.org
Subject: [PATCH bpf-next v4 19/22] samples: bpf: Convert xdp_redirect_map_kern.o to XDP samples helper
Also update it to use consistent SEC("xdp") and SEC("xdp_devmap")
naming, and use global variable instead of BPF map for copying the mac
address.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
samples/bpf/Makefile | 6 +-
...rect_map_kern.c => xdp_redirect_map.bpf.c} | 89 +++++--------------
2 files changed, 25 insertions(+), 70 deletions(-)
rename samples/bpf/{xdp_redirect_map_kern.c => xdp_redirect_map.bpf.c} (57%)
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 43d3e52a8659..8faef4bcead4 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -163,7 +163,6 @@ always-y += tcp_clamp_kern.o
always-y += tcp_basertt_kern.o
always-y += tcp_tos_reflect_kern.o
always-y += tcp_dumpstats_kern.o
-always-y += xdp_redirect_map_kern.o
always-y += xdp_redirect_map_multi_kern.o
always-y += xdp_rxq_info_kern.o
always-y += xdp2skb_meta_kern.o
@@ -357,6 +356,7 @@ endef
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
$(obj)/xdp_redirect_cpu.bpf.o: $(obj)/xdp_sample.bpf.o
+$(obj)/xdp_redirect_map.bpf.o: $(obj)/xdp_sample.bpf.o
$(obj)/xdp_redirect.bpf.o: $(obj)/xdp_sample.bpf.o
$(obj)/xdp_monitor.bpf.o: $(obj)/xdp_sample.bpf.o
@@ -368,10 +368,12 @@ $(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/x
-I$(srctree)/tools/lib $(CLANG_SYS_INCLUDES) \
-c $(filter %.bpf.c,$^) -o $@
-LINKED_SKELS := xdp_redirect_cpu.skel.h xdp_redirect.skel.h xdp_monitor.skel.h
+LINKED_SKELS := xdp_redirect_cpu.skel.h xdp_redirect_map.skel.h \
+ xdp_redirect.skel.h xdp_monitor.skel.h
clean-files += $(LINKED_SKELS)
xdp_redirect_cpu.skel.h-deps := xdp_redirect_cpu.bpf.o xdp_sample.bpf.o
+xdp_redirect_map.skel.h-deps := xdp_redirect_map.bpf.o xdp_sample.bpf.o
xdp_redirect.skel.h-deps := xdp_redirect.bpf.o xdp_sample.bpf.o
xdp_monitor.skel.h-deps := xdp_monitor.bpf.o xdp_sample.bpf.o
diff --git a/samples/bpf/xdp_redirect_map_kern.c b/samples/bpf/xdp_redirect_map.bpf.c
similarity index 57%
rename from samples/bpf/xdp_redirect_map_kern.c
rename to samples/bpf/xdp_redirect_map.bpf.c
index a92b8e567bdd..59efd656e1b2 100644
--- a/samples/bpf/xdp_redirect_map_kern.c
+++ b/samples/bpf/xdp_redirect_map.bpf.c
@@ -10,14 +10,10 @@
* General Public License for more details.
*/
#define KBUILD_MODNAME "foo"
-#include <uapi/linux/bpf.h>
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/if_packet.h>
-#include <linux/if_vlan.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <bpf/bpf_helpers.h>
+
+#include "vmlinux.h"
+#include "xdp_sample.bpf.h"
+#include "xdp_sample_shared.h"
/* The 2nd xdp prog on egress does not support skb mode, so we define two
* maps, tx_port_general and tx_port_native.
@@ -26,114 +22,71 @@ struct {
__uint(type, BPF_MAP_TYPE_DEVMAP);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(int));
- __uint(max_entries, 100);
+ __uint(max_entries, 1);
} tx_port_general SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_DEVMAP);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(struct bpf_devmap_val));
- __uint(max_entries, 100);
-} tx_port_native SEC(".maps");
-
-/* Count RX packets, as XDP bpf_prog doesn't get direct TX-success
- * feedback. Redirect TX errors can be caught via a tracepoint.
- */
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
- __type(key, u32);
- __type(value, long);
- __uint(max_entries, 1);
-} rxcnt SEC(".maps");
-
-/* map to store egress interface mac address */
-struct {
- __uint(type, BPF_MAP_TYPE_ARRAY);
- __type(key, u32);
- __type(value, __be64);
__uint(max_entries, 1);
-} tx_mac SEC(".maps");
-
-static void swap_src_dst_mac(void *data)
-{
- unsigned short *p = data;
- unsigned short dst[3];
+} tx_port_native SEC(".maps");
- dst[0] = p[0];
- dst[1] = p[1];
- dst[2] = p[2];
- p[0] = p[3];
- p[1] = p[4];
- p[2] = p[5];
- p[3] = dst[0];
- p[4] = dst[1];
- p[5] = dst[2];
-}
+/* store egress interface mac address */
+const volatile char tx_mac_addr[ETH_ALEN];
static __always_inline int xdp_redirect_map(struct xdp_md *ctx, void *redirect_map)
{
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
+ u32 key = bpf_get_smp_processor_id();
struct ethhdr *eth = data;
- int rc = XDP_DROP;
- long *value;
- u32 key = 0;
+ struct datarec *rec;
u64 nh_off;
- int vport;
nh_off = sizeof(*eth);
if (data + nh_off > data_end)
- return rc;
-
- /* constant virtual port */
- vport = 0;
-
- /* count packet in global counter */
- value = bpf_map_lookup_elem(&rxcnt, &key);
- if (value)
- *value += 1;
+ return XDP_DROP;
+ rec = bpf_map_lookup_elem(&rx_cnt, &key);
+ if (!rec)
+ return XDP_PASS;
+ NO_TEAR_INC(rec->processed);
swap_src_dst_mac(data);
-
- /* send packet out physical port */
- return bpf_redirect_map(redirect_map, vport, 0);
+ return bpf_redirect_map(redirect_map, 0, 0);
}
-SEC("xdp_redirect_general")
+SEC("xdp")
int xdp_redirect_map_general(struct xdp_md *ctx)
{
return xdp_redirect_map(ctx, &tx_port_general);
}
-SEC("xdp_redirect_native")
+SEC("xdp")
int xdp_redirect_map_native(struct xdp_md *ctx)
{
return xdp_redirect_map(ctx, &tx_port_native);
}
-SEC("xdp_devmap/map_prog")
+SEC("xdp_devmap/egress")
int xdp_redirect_map_egress(struct xdp_md *ctx)
{
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
struct ethhdr *eth = data;
- __be64 *mac;
- u32 key = 0;
u64 nh_off;
nh_off = sizeof(*eth);
if (data + nh_off > data_end)
return XDP_DROP;
- mac = bpf_map_lookup_elem(&tx_mac, &key);
- if (mac)
- __builtin_memcpy(eth->h_source, mac, ETH_ALEN);
+ __builtin_memcpy(eth->h_source, (const char *)tx_mac_addr, ETH_ALEN);
return XDP_PASS;
}
/* Redirect require an XDP bpf_prog loaded on the TX device */
-SEC("xdp_redirect_dummy")
+SEC("xdp")
int xdp_redirect_dummy_prog(struct xdp_md *ctx)
{
return XDP_PASS;
--
2.33.0
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